• 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:
    1402602 Crane safety devices TADANO IRONWORKS CO Ltd 6 July 1972 [6 July 1971 13 Sept 1971] 31800/72 Heading B8B A crane having a boom 24 luffed by an hydraulic cylinder 20 has stress-detecting means including at least one strain gauge mounted on the cylinder 20 to detect axial stress in the cylinder 20 and give an electrical output signal corresponding thereto. This signal is compared with a safety-limit signal to ascertain the safety state of the crane. Fig. 5 shows a device 36a comprising four pairs of strain gauges 37, 38 respectively arranged to measure longitudinal stress and stress perpendicular thereto of a piston-rod 32, the gauges 38 being used to apply temperature correction, and correction due to Poisson's ratio, to the gauges 37. Fig. 11 shows the device 36a incorporated in a circuit wherein the gauges 37, 38 are connected in opposite arms of a bridge. The amplified signal Vs from the bridge is fed to an indicating device 57 which also receives a signal Vq corresponding to the safety-limit stress for the particular extension of the jib 24 from one of three potentiometers 52, 53, 54 connected to the luffing axis shaft 25. The device 57 calculates the ratio of Vo to Vq and indicates this. An alarm device 68 gives an alarm signal when a predetermined limit to the ratio is exceeded and may prevent further operation of the crane to increase such ratio. Indicators 63, 65 may respectively show the extension and elevation of the jib 24.
    公开号:SU793371A3
    申请号:SU721805369
    申请日:1972-07-06
    公开日:1980-12-30
    发明作者:Укино Хисанори；Синохара Син-Ицу；Янази Хироюки
    申请人:Тадано Айронуоркс Ко Лтд (Фирма)；
    IPC主号:
    专利说明:

    (54) CRANE
    one
    The invention relates to lifting transport machinery and relates to the design of cranes.
    Known crane, which used a telescopic boom with strain gauge force sensors and power cylinders l; | .
    The drawback of the indicated 1st crane is in its constructive complexity;
    The closest known technical solution is a crane comprising a telescopic boom with fixed and sliding elements, mounted on an axis that can be rotated on a platform, a ram with a piston and a rod, pivotally mounted on a platform and associated with a boom, and a safety device 20j 2j.
    The disadvantage of this crane lies in the possibility of its tipping over and breaking due to obtaining inaccurate data on load parameters 25 and the angle of the boom.
    The purpose of the invention is to prevent the boom from tipping over and breaking the crane by visually observing the more accurate values of the forces and tilt angle of the boom under load that actually occur on the crane,
    权利要求:
    Claims (5)
    [1]
    For this, the fcth crane is provided with a housing with strain gauges mounted in the upper part of the piston rod and fixed contacts mounted on the boom axis of the crane, and the safety device contains an amplifier, potentiometers, an adder of electrical signals, a selector, and boom angle indicators extended boom elements and a current source, while the potentiometers are mounted on the crane platform and interact with the respective fixed contacts of the boom axis, the potentiometers connected with a selector, one of the potentiometers is connected to the indicator of the angle of rotation of the boom, and the tenometric sensors are electrically interconnected by a bridge circuit and are connected to a summation of electrical signals and a current source through a resistance and an amplifier; zones. In addition, the power cylinder can be made with the base on which the strain gauges are installed. Body with strain gauges can be embedded in a cylinder that is connected to the upper end of the stem. Body with strain gauges can be embedded in a glass that is connected to the upper end of the stem. In addition, strain gauges can be installed on the upper end of the power cylinder rod. FIG. 1 depicts the described valve; in fig. 2 — power cylinder, section; FIG. 3 - lower boom element with an axis and potentiometers; in fig. 4 is an electrical connection diagram of the safety device of FIG. 5. A safety device with indicators and control buttons j in FIG. 6 - the second version of mounting the case with strain gauges - sensors on the power cylinder rod; in fig. 7 - the third variant of mounting the case with strain gauges on the rod of the power cylinder; in fig. 8 - the second version of the power cylinder with a base; in fig. 9 - characteristic curves expressing the dependence of the crane radius and load within the safety limits of the boom; on Fig.10 characteristic curves expressing the relationship between the angle of the boom and the load within the safety of the boom; in fig. 11 characteristic curves expressing the relationship between the angle of lift of the boom and the output signal of the force indicating means; in fig. 12 - the fourth version of the attachment of strain gauges on the rod of the power cylinder. The described crane contains platform 1, on which a telescopic boom with fixed 3 and sliding 4 and 5 elements is pivotally mounted on axis 2. Load 5 is suspended on element 5 on cable 6. Platform 1 is also pivotally attached to axis 7 by means of a boom lift power cylinder 8 with a piston 9 and a rod 10) at its free end a housing 11 is mounted, which is connected to a fixed boom element 13 at its free end . The KrAn is equipped with a safety device containing potentiometers 14-17 mounted on platform i and interacting with the appropriate contacts 18-21 fixed on axis 2 and moving synchronously with the rotation of the boom, while the arrangement of contacts 1821, the potentiometers correspond to specific angles turning arrows. Each of the potentiometers 14-17 is set so that when interacting with the corresponding contact, it produces an electrical signal corresponding to a reduced or converted boom moment within safety limits at each boom angle with extended elements 4 and 5 of the boom l. Potentiometers 14-17 are electrically connected to current source 22. The housing 11 is made with a neck 23 and is mounted on the free end of the rod 10, in which strain gauges 24-27 are installed, assembled according to a bridge circuit and electrically connected to the current source 28 and through a resistance 29 with a neutral wire 30 with an amplifier 31. Amplifier 31 connected to the adder 32 electrical signals. Potentiometers 14-16 are electrically connected to the selector 33, which in turn is electrically connected to the adder 32. The adder 32 is equipped with an arrow 34 and a scale with a safe 35 and a dangerous 36 boom operation zones. Potentiometer 17 is connected to the boom angle indicator 37, and the selector 33 is connected with the pointer 38 to the location of the boom extension members 4 and 5. The adder is also connected to the boom critical alarm indicator 39. In the second constructive version, the housing 11 with strain gauges 24-27 is integrated in the cylinder 40, which is connected to the upper end of the rod 10. In the third constructive version, the housing 11 with strain gauges 24-27 is embedded in the glass 41, which is connected to the upper end of the rod 10, In the second constructive version of the power cylinder 8 is made with a base 42, on which strain gauges 24-27, an amplifier 31, a selector 33, an adder 32, pointers 37 and 38, and an alarm device 39 are mounted. The safety device is assembled in a striker 43 with a panel 44, on which the scale with safe 35 and dangerous 36 zones of operation of the boom, pointers 37 and 38 and buttons 45 and 46 of switching on the adder 32 and the current source are imposed. The designation of the main parameters used in the crane is as follows: boom reach; boom angle; cargo weight; coefficient of static friction between piston and power cylinder; electrical safety limit signal with retracted elements 4 and 5 into boom element 3; an electrical signal from the selector 33; Vt; - electrical output signal of strain gauges; LjjLnli L -.- curves expressing the corresponding loads within the safety limits of the straight elements 4 and 5 R - the working range of the boom; M. curves expressing moments when connecting contacts 18, 19 and 20 potentiometers respectively to potentiometers 14, 15 and 16. The described valve works as follows. The extension of the elements of the boom 4 to 5 is carried out by conventional means. The boom is raised to the required angle by the power cylinder 8 with the rod 10. The boom E, the boom angle Q and the load W carried by the boom are in mutual relation with each other, which prevents the crane from falling or breaking. The safety limit of such a crane is established by a characteristic circuit or curve, which expresses the relationship between these three factors. In this case, for convenience in practice, instead of lifting angle 9, the radius of action or working radius R is used. Curves L, L2 or L express the corresponding loads, within safety limits in cases where the boom is in a fully retracted state or when the second or third elements 4 or 5 are fully elongated, respectively. FIG. 9 and 10 respectively show the relationship between the radius of action or the working radius R and such a load in the safety limit or between the angle of lift 6 of the boom and such a load W in the safety limit. Such a load, within the limits of safety, expressed by these characteristic curves, is determined from the point of view of destruction, as well as the fall of the crane. The operation of the crane is safe when the load W is lower than the load within the safety range with a radius R of action or angle of rotation Q for a given departure length E of the boom of the crane. Instead of determining or measuring each and the three factors mentioned, by separately and comparing the defined or measured factors with these characteristic curves, the force F that is applied to the body 11 with strain gauges varies with changes in the moment attached to the boom is determined. This force is compared to a previously obtained effort within the safety limits for a given boom offset C and an elevation angle of 9. lines. When lifting the boom, i.e. Pivot axis 2, contacts 18, 19, and 20 on it interact with potentiometers 14, 15, and 16; they give out an electric, tric signal Vp at each angle of elevation & with fully extended elements 4 and 5 arrows. The electrical signals V correspond to a force within the safety limits in fully retracted 4 to 5 boom elements or fully elongated, and the electrical signal Vg to the actual force in this state. The safety device calculates the ratio of the signal Vg exiting the device to indicate the force to the signal Vq exiting from one potentiometer 14.15 or 16 through the selector 33, and this ratio is indicated on the adder 32 as a percentage. The rotation of the arrow 34 into the danger zone 36 of the scale is not allowed, since in this case the boom of the crane may be damaged or its tipping over. In this case, since the signal Vq coming from the selector 33 corresponds to the amount of force within the safety at a given angle of lift 9 of the boom, the safety device shows a ratio of 100% if Vg Vq, which expresses the safety limit of the crane, and this device shows a ratio lower or higher than 100% if V Vq. or, fq which indicates conditions for safe or hazardous crane operation. Practically, such a value within the safety limits is set somewhat lower than the value at which a crane can actually fall or break. If the magnitude of the signal Vg exceeds the value of Vq by a little, then the crane does not fall and does not break immediately and the operator can correct the operation of the crane by lowering the ratio Vg to V when the device has shown a ratio above 100%. Potentiometer 17 is associated with a lift angle pointer 37, which is enclosed in chest 43 and shows a lift angle 9. In addition, pointer 38 is connected to the selector 33, which indicates the extended state of the boom. Observing the accumulator 34 arrow 32 ensures normal operation of the crane (safe). If the parameters go beyond normal operation, the detector 39 is triggered. Other design options for mounting strain-gauge sensors do not change the operation of the electrical circuit of the safety device. Claim 1. A crane comprising a telescopic boom with fixed and sliding elements mounted on an axis
     rotatable on the platform, a ram and piston ram mounted on the platform and associated with the boom, and a safety device that, in order to prevent the boom from tipping over and breaking the crane by visual observation of the more accurate on the crane the magnitude of the force and the angle of the boom on the load, it is equipped with a housing with strain gauges mounted in the upper part of the piston rod and fixed contacts mounted on the axis of The crane contains a safety device, an amplifier, potentiometers, a selector, an adder of electrical signals, boom angle indicators and the position of the extended boom elements and a current source, the potentiometers mounted on the crane platform interacting with the respective fixed contacts of the boom axis, the potentiometers connected to the selector, one of the potentiometers is connected to the indicator of the angle of rotation of the boom, and the strain gauges are electrically interconnected by a bridge circuit and through the resor phenomenon and amplifying are connected to an adder electrical signals and a current source, wherein the electrical signal adder configured to scale s.opasnoy and safe zones.
    [2]
    2. A crane according to claim 1, characterized in that the ram is made with a base on which strain gauges are mounted.
    [3]
    3. Crane according to claim 1, distinguishing and and with. in that a housing with strain gauges is embedded in the cylinder, which is associated with the upper end of the rod.
    [4]
    4. Crane according to claim 1, characterized in that the housing with strain gauges is embedded
    in a glass that is associated with the upper end of the stem.
    [5]
    5. A crane according to claim 1, characterized in that the strain gauges are mounted on the upper end of the power cylinder rod.
    Priority points: 09/13/71 on PP. 1,2 and 5; 07.07.71 in PP. 3 and 4.
    Sources of information taken into account in the examination
    1. US Patent No. 3489294, cl. 212-31, pub. 1968.
    2. US Patent (3724679,
    cl. 212-31, pub. 1970 (prototype)
    one /
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    同族专利:
    公开号 | 公开日
    US4039084A|1977-08-02|
    SE390159B|1976-12-06|
    FR2144815B1|1977-08-26|
    AU4403072A|1974-01-03|
    DE2232536C3|1982-11-04|
    DE2232536B2|1979-05-03|
    FR2144815A1|1973-02-16|
    DE2232536A1|1973-01-18|
    AU476170B2|1976-09-16|
    GB1402602A|1975-08-13|
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    DE1268340B|1964-07-18|1968-05-16|Schenck Gmbh Carl|Lifting equipment, especially a crane, with an overload protection device|
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    DE2004041C3|1970-01-29|1975-10-09|Ludwig Pietzsch|overload protection for jib cranes, especially telescopic cranes|
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    GB9326347D0|1993-12-23|1994-02-23|Grove Europ Limited|Improvements in and relating to telescopic booms|
    US5877693A|1998-05-27|1999-03-02|Grove U.S. L.L.C.|Method and apparatus for measuring the length of a multi-section telescopic boom|
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    CN104771854B|2015-04-14|2018-01-19|三一汽车制造有限公司|A kind of fire fighting truck and its operation protecting device, method|
    US9771246B2|2015-08-31|2017-09-26|Thomas Bond|Winch apparatus and method of use thereof|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP4924171A|JPS5145139B1|1971-07-06|1971-07-06|
    JP8366471U|JPS4838293U|1971-09-13|1971-09-13|
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