• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a press (1) for washing and/or dewatering a liquid suspension, said press comprising a first rotatable drum (3), a second rotatable drum (5), the first rotatable drum (3) being movable in relation to the second rotatable drum (5), and a first pair of bearing supports, each of which bearing supports (29) being provided with a bearing (33) in which a respective end of the first drum (3) is journalled, a second pair of bearing supports, each of which bearing supports (31) being provided with a bearing (35) in which a respective end of the second drum (5) is journalled. Each bearing support (29) of the first pair of bearing supports is connected to a frame (6) of the press (1) by a mechanical linkage comprising a first link arm arrangement (37) and a second link arm arrangement (39), wherein each of said first and second link arm arrangements (37, 39) is pivotally connected to each of a respective bearing support (29, 31) and said frame (6).
    公开号:FI20215280A1
    申请号:FI20215280
    申请日:2021-03-15
    公开日:2021-09-17
    发明作者:Anders Lindström；Pontus Strandh；Mikael Lindberg
    申请人:Andritz Ab；
    IPC主号:
    专利说明:

    A PRESS FOR WASHING AND/OR DEWATERING A LIQUID SUSPENSION Technical Field of the Invention The present invention relates to a press for washing and/or dewatering a liquid suspension, said press comprising a first rotatable drum, a second rotatable drum, the first rotatable drum being movable in relation to the second rotatable drum, and a first pair of bearing supports, each of which bearing supports being provided with a bearing in which a respective end of the first rotatable drum is journalled, a second pair of bearing supports, each of which bearing supports being provided with a bearing in which arespective end of the second rotatable — drum is journalled. Background Art When dewatering a liguid suspension of a solid biological material, for example a suspension of cellulose fibres which are to be used for making paper pulp, use is often made of a press comprising two rotatable dewatering drums arranged next to each other. Generally, such a dewatering drum has a filter net or screen plate on the outside thereof, against which the pulp is compressed in a gap formed between a vat of the press and the dewatering drum. An example of a press for washing and/or dewatering pulp is illustrated in WO 2010/036194 A1. The press comprises a first press roll and a second press roll which are arranged to define a press nip between them. The first press roll is pivotally attached to a frame such that the first press = roll is movable in relation to the second press roll to vary the press nip size. N However, the possibility to vary the press nip in this press may be regarded as g limited since the circular movement around the pivot point will compromise the 2 25 gapbetween the vat and drum. z S Summary of the Invention
    N 0 It is an object of the present invention to provide an improved press for O washing and/or dewatering a liguid suspension. These and other objects that will be apparent from the following summary and description are achieved by a press according to the appended claims.
    According to one aspect of the present disclosure there is provided a press for washing and/or dewatering a liquid suspension, said press comprising a first rotatable drum, a second rotatable drum, the first rotatable drum being movable in relation to the second rotatable drum, and a first pair of bearing supports, each of which bearing supports being provided with a bearing in which a respective end of the first rotatable drum is journalled, a second pair of bearing supports, each of which bearing supports being provided with a bearing in which a respective end of the second rotatable drum is journalled, wherein each bearing support of the first pair of bearing supports is connected to a frame of the press by a mechanical linkage comprising a first link arm arrangement and a second link arm arrangement, wherein each of the first and second link arm arrangements is pivotally connected to each of a respective bearing support and said frame. The mechanical linkages provide for great freedom in designing how the rotatable drums can be moved relative each other and allow for a substantially horizontal movement of at least one of the rotatable drums. The mechanical linkages thus provide for a solution in which it can be chosen how the rotatable drums can be separated from each other. This has the advantage that improved control and precision of the movement is achieved compared to a solution in which a rotatable drum is pivotable about one single pivot joint. The mechanical linkages thus allow a rotatable drum to belaterally displaced relative another rotatable drum in a very controlled and robust manner. Also, an extended range of motion may be achieved in a robust and reliable manner, which provides for a flexible solution. Also, a solution providing low wear is achieved, since the need of sliding surfaces to enable movement of a rotatable drum is eliminated by the = 25 mechanical linkages.
    S se The mechanical linkages thus allow for great freedom in designing how the LO rotatable drums are laterally movable away from each other and towards each z other. More specifically, by varying the size and/or the position of individual link a S arms of the mechanical linkages at each side of the press, a desired lateral & 30 movement of the rotatable drums relative to each other may be achieved in a N robust and controllable manner. The lateral movement to set a desired distance N between the rotatable drums may be achieved by operating adjusting devices pivotally connected between bearing supports of the first and second pairs of bearing supports.
    According to one embodiment, the shortest distance between said first and second link arm arrangements is larger than O mm.
    According to one embodiment, the shortest distance between pivot joints of said first link arm arrangements, and/or the shortest distance between pivot joints of said second link arm arrangement, is larger than O mm.
    According to one embodiment said first link arm arrangement and/or said second link arm arrangement comprises one single link arm.
    According to one embodiment said first link arm arrangement and/or said second link arm arrangement comprises two parallel link arms.
    According to one embodiment each of the bearing supports of the second pair of bearing supports is connected to a frame of the press by a mechanical linkage comprising a first link arm arrangement and a second link arm arrangement, wherein each of the first and second link arm arrangements is pivotally connected to each of the bearing support and said frame, which provides for an even more flexible solution.
    According to one embodiment the press further comprises an adjusting device, such as e.g. a hydraulic device comprising at least one hydraulic cylinder, pivotally connected to each of a bearing support of said first pair of bearing supports and a bearing support of said second pair of bearing supports.
    These and other aspects of the invention will be apparent from and elucidated with reference to the claims and the embodiments described — hereinafter.
    QA & A Brief Description of the Drawings - The invention will now be described in more detail with reference to the E 25 appended drawings in which: D> N Fig. 1 is a schematic view and illustrates a washing and dewatering press.
    a N Fig. 2A is a schematic side view and illustrate parts of a dewatering press according to known art.
    Fig. 2B is a schematic side view and illustrates possible movement of a press roll of the dewatering press shown in Fig. 2A.
    Fig. 3A is a schematic side view and illustrates parts of a press according to an embodiment of the present invention.
    Fig. 3B is a schematic sideview and illustrates possible movement of a rotatable drum of the press shown in Fig. 3A.
    Fig. 4 is a schematic perspective view and illustrates parts of a press according to a second embodiment of the present invention.
    Detailed Description of Preferred Embodiments of the Invention The present disclosure relates generally to washing and/or dewatering devices having two rotatable drums arranged next to each other and mounted in a frame.
    Fig. 1 illustrates a dewatering device in the form of a press 1 for washing and dewatering a liquid suspension of a solid biological material, such as cellulose pulp.
    The press 1 has a first dewatering drum 3 and a second dewatering drum 5. The first dewatering drum 3 is arranged to rotate counter-clockwise.
    The second dewatering drum 5 is arranged to rotate in an opposite direction, i.e. clock-wise, but is, for the rest similar in parts and function to the first dewatering drum 3, even though the second dewatering drum 5 is mirror-inverted relative to the first dewatering drum 3. The press 1 further comprises a press device in the form of a press vat 7 inside which each of the first and second rotatable drums 3, 5 are arranged for = rotation.
    The lower parts of the dewatering drums 3, 5 are surrounded by the N press vat 7, and the upper parts of the dewatering drums 3, 5 are surrounded by a g respective vat top 9, 11. Above each dewatering drum 3, 5 an inlet 13, 15 for a 2 25 liquid suspension of cellulose pulp, i.e. wet cellulose pulp with a dry content of E typically in the range 1-15 by weight TS, and a distribution screw 17, 19 for 3 distribution of pulp are arranged.
    Each distribution screw 17, 19 is arranged to © distribute pulp received via the inlet 13, 15 along the whole length of a respective O dewatering drum 3, 5. The press vat 7 is provided with a number of liquid inlets 21 through whichwash liquid may be supplied to the pulp.
    Between the dewatering drums 3, 5 a press nip 23 is formed.
    Above the press nip 23 a discharge screw 25 for the removal of dewatered pulp is arranged. The press vat 7 is vertically movable relative to the dewatering drums 3, 5, a frame (not shown) and the vat tops 9, 11. In the illustrated embodiment the vertical movement is achieved by the press vat 7 being arranged on hydraulic cylinders (not shown), which can be 5 caused to lower the vat 7 relative to the frame. Also, each of the vat tops 9, 11, also referred to as flaps, can be opened outwards with help of hydraulic cylinders. The press vat 7 and the vat tops 9, 11 can thus be opened to provide good access inside the press 1 for maintenance purposes.
    In this embodiment each of the press vat 7 and the vat tops 9, 11 is thus movable by means of a hydraulic cylinder. It is however understood that other mechanical devices, such as e.g. screw jacks, can be used for this purpose. Each dewatering drum 3, 5 has a liquid-permeable layer, such as a perforated plate or a filter cloth, which allows the cellulose fibers, in the form of dewatered pulp, to remain on the surface of the dewatering drums 3, 5 during pressing of the suspension against the outer periphery of the drums 3, 5, while liquid is pressed into the interior of the drums 3, 5 and led away.
    When dewatering a liquid suspension the suspension is supplied to the press vat 7 via the inlets 13, 15 and is then compressed in the press nip 23. The liquid contained in the suspension is pressed through the periphery of the dewatering drums 3, 5 and into the interior of the drums 3, 5. Supplied washing liquid will also be compressed into the interior of the dewatering drums 3, 5. The liquid pressed inside the dewatering drums 3, 5 will accumulate at the bottom of the drums 3, 5 and flow out therefrom via filtrate channels (not shown) at both N ends of the the dewatering drums 3, 5. When the pulp has been sufficiently a 25 dewatered it leaves the press 1 via the discharge screw 25.
    <Q O Each of the dewatering drums 3, 5 is journalled in a frame of the press 1.
    x The frame stands on a solid ground, e.g. a floor.
    2 Fig. 2A illustrates parts of an apparatus for washing and dewatering = cellulose containing pulp according to known art. The press comprises two press a 30 rolls 102, 104 and a frame 106. This apparatus includes a first pair of bearing housings 202 provided with bearings 204, in which bearings 204 the ends of the first dewatering drum 102 are journalled, and a second pair of bearing housings
    206 provided with bearings 208, in which bearings 208 of the ends of the second dewatering drum 5 are journalled. The bearing housings 202 of the first pair is pivotally attached to the frame 106 and the bearing housings 206 of the second pair are fixedly attached to the frame 106.
    Each bearing housing 202 of the first pair and the opposite bearing housing of the second pair are connected to each other by an adjusting device 220. The adjusting device is adapted to force the first press roll 102 away from and towards the stationary second press roll 104 for providing a specific distance between the press rolls 102, 104. The adjusting devices 220 are adapted to perform movement of the first press roll 102 by pivoting the bearing housings 202 of the first pair about their pivot axes 214, as illustrated by an arrow in Fig. 2B. Fig. 3A illustrates parts of a press for washing and/or dewatering a liquid suspension according to an embodiment of the present invention. The press 1 comprises a first rotatable drum 3, a second rotatable drum 5 and a frame 6. The press 1 further comprises a first pair of bearing supports 29 and a second pair of bearing supports 31. In Fig. 3A only one bearing support 29 of the first pair of bearing supports and one bearing support 31 of the second pair of bearing supports are shown. A first end of the first rotatable drum 3 is journalled in the first bearing support 29 of the first pair of bearing supports and an opposite end (not shown) of the the first rotatable drum 3 is journalled in a second bearing support (not shown) of the first pair of bearing supports. A first end of the second rotatable drum 5 is journalled in the first bearing support 31 of the second pair of bearing supports N and an opposite end (not shown) ofthe second rotatable drum 5 is journalled in a N 25 second bearing support (not shown) of the second pair of bearing supports. To S this end, each of the bearing supports of the first pair of bearing supports 29 is - provided with a bearing 33 in which a respective end of the first rotatable drum 3 E: is journalled and each of the bearing supports 31 of the second pair of bearing 2 supports 31 is provided with a bearing 35 in which a respective end of the second = 30 rotatable drum 5 is journalled.
    N Each bearing support 29, 31 of the first and second pairs of bearing supports is connected to the frame 6 of the press 1 by a mechanical linkage.
    In this embodiment each bearing support 29, 31 is connected to the frame 6 by a mechanical linkage comprising two separate link arms arranged next to each other, as seen in a direction transverse to the axes of rotation of the rotatable drums 3, 5, i.e. in a horizontal direction.
    Hence, the firstbearing support 29 of the first pair of bearing supports is connected to the frame 6 by a first link arm 37 and a second link arm 39, and a second bearing support of the first pair of bearing supports is connected to the frame 6 by a first link arm (not shown) and a second link arm (not shown). Also, the first bearing support 31 of the second pair of bearing supports is connected to the frame 6 by a first link arm 41 and a second link arm 43 and a second bearing support of the second pair of bearing supports 31 is connected to the frame 6 by a first link arm (not shown) and a second link arm (not shown). The mechanical linkages allow for substantially pure lateral movement of the rotatable drums 3, 5 relative to each other.
    To this end, each link arm is at one end pivotally connected to a bearing support and at an opposite end pivotally connected to the frame 6. Hence, each of the first and second link arms 37, 39 that connect the first bearing support 29 of the first pair of bearing supports to the frame 6 is at one end 37a, 39a pivotally connected to the first bearing support 29 and at an opposite end 37b, 39b connected tothe frame 6, and each of the link arms (not shown) that connect the second bearing support of the first pair of bearing supports to the frame 6 is at one end pivotally connected the second bearing support of the first pair of bearing supports and at an opposite end connected to the frame 6. Also, each of the first and second link arms 41, 43 that connect the first bearing support 31 of the second pair of bearing supports to the = 25 frame 6 is at one end 41a, 43a pivotally connected the first bearing support 31 N and at an opposite end 41b, 43b connected to the frame 6, and each of the link 3 arms (not shown) that connect the second bearing support (not shown) of the 2 second pair of bearing supports to the frame 6 is at one end pivotally connected E the second bearing support of the second pair of bearing supports and at an S 30 opposite end connected to the frame 6. Each pivot axis of the mechanical LO linkages is defined by a pivot pin received in a recess. a N Each bearing support 29 of the first pair of bearing supports is connected to a bearing support 31 of the second pair of bearing supports by an adjusting device 45. In this embodiment each adjusting device 45 is a hydraulic device in the in the form of a hydraulic cylinder, although any other suitable mechanical device can be used. Each such adjusting device 45 is at one end pivotally connected to a bearing support 29 of the first pair of bearing supports and at an opposite end to a bearing support 31 of the second pair of bearing supports, as illustrated in Fig. 3A. The adjusting devices 45 are thereby arranged to laterally move the rotatable drums 3, 5 relative to each other, as illustrated by arrows in Fig. 3B. More specifically, the adjusting devices 45 are arranged to move the rotatable drums 3, 5 away from and towards each other. Lateral movement of the rotatable drums 3, 5 relative each other may thus be achieved by operating the adjusting devices 45. Also, the adjusting devices 45 are adapted for maintaining a certain distance between the rotatable drums 3, 5 when the press 1 is in use. The lateral movement of the rotatable drums 3, 5 relative each other is guided by the link arms 37, 39, 41, 43 of the mechanical linkages that connect each of the bearing supports 29, 31 of the first and second pairs of bearing supports to the frame 6.
    Hereinafter a press according to a second embodiment will be described with reference to Fig. 4. Many features disclosed in the first embodiment are also present in the second embodiment with similar reference numerals identifying similar or same features. Having mentioned this, the description will focus on explaining the differing features of the second embodiment.
    The second embodiment differs from the first embodiment in that each bearing support 31 of the second pairs of bearing supports is connected to the frame 6 of the press by a mechanical linkage comprising two link arm arrangements 141, 143, each of which comprises two parallel link arms, instead of S 25 link arm arrangements in the form of two single link arms 41, 43. Hence, the first se bearing support 31 of the second pair of bearing supports is connected to the LO frame 6 by a first link arm arrangement 141 and a second link arm arrangement z 143, as illustrated in Fig.4. The first link arm arrangement 141 comprises two S parallel link arms 151, 153 having common pivot axes. Each such common pivot & 30 axis is defined by a respective pivot pin 155, 157 received in arecess. The N second link arm arrangement 143 comprises two parallel link arms, of which one N 159 is visible in Fig. 4, having common pivot axes, each of which is defined by a respective pivot pin 161, 163.
    Also, a second bearing support (not shown) of the second pair of bearing supports is connected to the frame 6 by a first link arm arrangement, which comprises two parallel link arms, and a second link arm arrangement which comprises two parallel link arms.
    It is appreciated that each bearing support of the first pair of bearing support may also be connected to the frame in the same manner as each bearing support 31 of the second pairs of bearing supports is connected to the frame 6 in the second embodiment, i.e. by means of link arm arrangements comprising two parallel link arms.
    The person skilled in the art realizes that the present invention by no means is limited to the embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims.
    With reference to Fig. 3A, it has been described that each individual link arm of the mechanical linkages has a certain length and position. It is however appreciated that the link arms may have a different length, and/or shape and/or position. By varying the length between, and/or the position of, attachment points of individual link arms of the mechanical linkages, a desired lateral movement of the rotatable drums relative to each other may thus be achieved.
    With reference to Fig. 3A, it has been described that both rotatable drums 3, 5 of the dewatering press 1 are connected to the frame 6 by mechanical linkages. It is understood that one of the rotatable drums 3, 5 may be stationary, i.e. attached to the frame 6 in the same manner as the second press roll 104 is — attached to the frame 106 in Fig. 2A, or pivotally attached to the frame 6, i.e. in O the same manner as the first press roll 102 is attached to the frame 106 in Fig. g 25 2A
    O jOSS
    权利要求:
    Claims (7)
    [1] 1. A press (1) for washing and/or dewatering a liquid suspension, said press comprising a first rotatable drum (3), a second rotatable drum (5), the first rotatable drum (3) being movable in relation to the second rotatable drum (5), and a first pair of bearing supports, each of which bearing supports (29) being provided with a bearing (33) in which a respective end of the first rotatable drum (3) is journalled, a second pair of bearing supports, each of which bearing supports (31) being provided with a bearing (35) in which a respective end of the second rotatable drum (5) is journalled, characterized in that each bearing support (29) of the first pair of bearing supports is connected to a frame (6) of the press (1) by a mechanical linkage comprising a first link arm arrangement (37; 141) and a second link arm arrangement (39; 143), wherein each of said first and second link arm arrangements (37, 39; 141, 143) is pivotally connected to each of a respective bearing support (29, 31) and said frame (6).
    [2] 2. A press according to claim 1, wherein the shortest distance between said first and second link arm arrangements (37, 39; 141, 143) is larger than O mm.
    [3] 3. A press according to any one of the preceding claims, wherein the shortest = distance between pivot joints of said first link arm arrangement (37; 141) is larger S than O mm. g LO 4. A press according to any one of the preceding claims, wherein said first link > arm arrangement and/or said second link arm arrangement comprises one single Ao - 25 link arm (37, 39).
    [4] O
    [5] N O 5. A press according to any one of the preceding claims 1-3, wherein said first link O arm arrangement (141) and/or said second link arm arrangement (143) comprises two parallel link arms (151, 153, 159).
    [6] 6. A press according to any one of the preceding claims, wherein each of the bearing supports (31) of the second pair of bearing supports is connected to a frame (6) of the press (1) by a mechanical linkage comprising a first link arm arrangement (41) and a second link arm arrangement (43), wherein each of said first and second link arm arrangements (41, 43) is pivotally connected to each of the bearing support (31) and said frame (6).
    [7] 7. A press according to any one of the preceding claims, wherein the press further comprises an adjusting device (45) pivotally connected to each of a bearing support (29) of said first pair of bearing supports and a bearing support (31) of said second pair of bearing supports.
    N
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    O <Q
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    O 00
    N
    LO
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    类似技术:
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    同族专利:
    公开号 | 公开日
    SE2050278A1|2021-09-17|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE2050278A|SE2050278A1|2020-03-16|2020-03-16|A press for washing and/or dewatering a liquid suspension|
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