• 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:

    公开号:SU952098A3
    申请号:SU802929301
    申请日:1980-05-29
    公开日:1982-08-15
    发明作者:Авар Золтан；Шалавец Лайош；Лендваи Иштван
    申请人:Эпитегепдьярто Валлалат (Инопредприятие)；
    IPC主号:
    专利说明:

    The invention relates to a handling equipment, namely, safety devices of lifting machines, and can be used to prevent overloading of the lifting mechanism. There is a known method of preventing lift mechanism overload, according to which the force in the lift mechanism is measured and form an analog electrical signal proportional to the aforementioned force, compare the analog electrical signal with the reference signals and give an alarm signal when the mechanism is overloaded The reliability is relatively low. Preventing Mechanism Overload - Avoiding False Overload Prevention. A device for preventing overloading of a lifting mechanism is known, comprising a force measuring unit, the output of which is connected to the amplifier input, the output of which is connected to the control inputs of the first and second comparators, whose reference inputs are connected to the outputs of the threshold setting block, and the output of the first comparator is connected to the first input of the execution unit t2. A disadvantage of the known device is the comparatively low reliability of preventing the overloading of the lifting mechanism with the exception of false preventions of overload. The purpose of the invention is to increase reliability. This goal is achieved by differentiating the analog electrical signal and also integrating the predetermined fractional part of the differentiated analog electrical signal until the analog signal of the second reference signal exceeds the differentiated analog electrical signal at the instant when the analog signal of the first reference signal exceeds the integrated reference signal. the fractional part of the differentiated analog electrical signal and in the case of ysheni integrated predetermined fractional portion of the differentiated analog electrical signal differentiated analog electrical signal Paul said alarm. The predetermined fractional part is 19/20 of a differentiated analog electrical signal. When an alarm is triggered, reference signals can be reduced. In order to improve the reliability of preventing the overload of the lifting mechanism while eliminating false preventions of overload, the device for carrying out the proposed method is equipped with a differentiating unit, the input of which is connected to the output of the amplifier, a third comparator, the output of which is connected to the input of the executive unit the first input of the third comparator is connected to the output of the differential unit, the integrator, the first input of which is connected to the output of the splitter direct voltage and the second input of the integrator connected to the output of the second comparator, and the output of the integrator is connected to the second input of the third comparator. The output of the third comparator can be connected to the input of the threshold settings block. The output of the executive unit can be connected to the input of the threshold settings block. The device can be equipped with a bias voltage shaping unit connected between the integrator output and the second input of the third comparator. FIG. 1 shows a functional diagram of the device for preventing overloading of the lifting mechanism; in fig. 2 - signals on the main elements of cxeNbi. The lifting device overload prevention device contains a power measurement unit 1, the output of which is connected to the input of the amplifier 2, the output of which is connected to the control inputs 3 and 4 of the first and second comparators 5 and 6 and the input of the differentiating unit 7. Reference inputs 8 and 9 of the comparators 5 and b connected to the outputs of the block 10 of the threshold settings. The output of the comparator 5 is connected to the first input 11 of the executive unit 12, which includes the amplifier 13 and the relay 14. The output of the third comparator 15. is connected to the second input 16 of the unit 12. The first input 1 of the comparator 15 and the input of the voltage divider 18 are connected to block output. The output of the divider 18 is connected to the first input 19 of the integrator 20, the second input 21 of which is connected to the output of the comparator 6. The output of the integrator 20 is connected to the second input 22 of the comparator 15. According to the proposed embodiment, between the output of the integrator 20 and the input 22 of the comparator 15 is displacement wives. The output of the comparator 15 or the output of the block 12 (not shown) is connected to the input of the block 10. The integrator 20 is made with a transistor 24. You can implement a functional circuit, for example, using an integrated differential amplifier, etc. The output of the amplifier 2 contains signals 25-27, and the signal level 28 corresponds to the nominal force (load). The signal at input 9 of comparator 6 is equal to signal 28. Signal 29 corresponds to an overload of 5%, and the signal at input 8 of comparator 5 is equal to signal 29. Signals 30-32 correspond to the signal at output of block 7. Signals 33-35 correspond to signal at input 17 of comparator 15 , signal 36-38 correspond to the signal at the input 22 of the comparator 15 (in the presence of block 23). Signal. 17 is equal to signal 30. Signals 39-41 correspond to the signal at the output of the comparator 15. Signal level 42 corresponds to the maximum permissible dynamic load. According to the prevention method. overload in the device for its implementation at the output of the amplifier 2; the signal is proportional to the force in the mechanism. In the case of a nominal force in the mechanism at time 43, the signal 25 reaches the value at which the comparator 6 operates and stops the integration of the signal in the integrator 20, the signal at the input 22 of the comparator 15 does not change, and the signal at the input 17 of the comparator 15 changes. If the rate of increase of the signal 25 decreases, which means the proximity of this signal to the highest value, there is no overload of the mechanism, while at time 44 the comparator 5 is triggered. In case (Fig. 2) the signal 36 is above the signal 33, the comparator 15 does not work and block 12 remains in the initial state. If after the triggering of the comparator 6 at the time 45, the rate of increase of the signal 26 does not change, indicating a further excessive increase in the dynamic component of the force, then when the comparator 5 is triggered at the time 46, the signal 34 is (Fig. 2) above the signal 37, which leads to the operation of the comparator 15 and block 12; In the case of a slowly varying force in the mechanism, signal 27 also changes slowly, signal 35 (Fig. 2) is located above signal 38, and at time 47 the comparator 15 and block 12 are triggered. Comparator output
    5 can be connected, not to block 12, ac by a comparator 15 (shown in Fig. 1 by the dotted line).
    Thus, upon reaching the given level by the sinal, the integration of the differentiated sinal is stopped, when the signal reaches a higher specified level, the differentiated and the aforementioned integrated signals are compared and, according to the comparison results, an overload is detected.
    According to the invention, according to the rate of growth of the mechanism, the greatest value of the force is estimated and, in case of possible excess by force I of the maximum permissible value, the mechanism overload is prevented, which makes it possible to reliably protect the mechanism from overload and to eliminate false actuators of the execution unit.
    权利要求:
    Claims (7)
    [1]
    1 .. A method of preventing overloading of a lifting mechanism, in which a force in a lifting mechanism is measured and form an analog electric signal proportional to said force, compare an analog electric signal with reference signals, and when the mechanism is overloaded, an alarm signal is provided that in order to increase reliability, they differentiate the analog electric signal, and also integrate the specified fractional part of the differential analog electric signal until the moment of exceeding the analog The second electrical signal is supplied with a second electrical signal, while at the time the analog electrical signal exceeds the first reference signal, the differentiated analog electrical signal is compared with the integrated predetermined fractional part of the differential analog electrical signal and, in the case of a higher differential signal, the integrated fractional analog electrical signal is supplied mentioned alarm.
    [2]
    . 2. Method POP.1, differing from the fact that the predetermined fractional part is 19/20 of a differentiated analog electrical signal.
    [3]
    3. The method according to claim 1, characterized in that when an alarm is given, the reference is reduced
    signals.
    [4]
    4. Device for carrying out the method according to claims. 1-3, the content of the force measurement unit, the output of which is connected to the input of the amplifier, the output
    0 which is connected to the control inputs of the first and second comparators, the reference inputs of which are connected to the outputs of the threshold settings block, and the output of the first comparator is connected to the first input of the execution unit, characterized in that, in order to increase the reliability of preventing the overload of the lifting mechanism
    Q with elimination of false overload prevention, it is equipped with a differentiating unit, the input of which is connected to the amplifier output, a third comparator, the output of which is connected to the second input of the execution unit, a voltage divider, the input of which, together with the first input of the third comparator, is connected to the output of the differentiating unit, integrator whose first entry
     is connected to the output of the voltage divider, and the second input of the integrator is connected to the output of the second comparator, and the output of the integrator is connected to the second input of the third comparator.
    five
    [5]
    5. The device according to claim 4, characterized in that the output of the third comparator is connected to the input of the threshold settings block.
    0
    [6]
    6. The device according to claim 4, of which is that the output of the execution unit is connected to the input of the threshold settings block.
    five
    [7]
    7. The device according to claims 4-6, o, t is characterized in that it is equipped with a bias voltage shaping unit connected between the integrator output and the second input
    Q third comparator.
    Sources of information taken into account in the examination
    1. USSR author's certificate
     655300, class B 66 C 15 / 00.10.10.73.
    2. Authors certificate of USSR 742363, cl. B 66 C 23 / 90.07.07.78
    (prototype).
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    同族专利:
    公开号 | 公开日
    PL132332B1|1985-02-28|
    DD151142A5|1981-10-08|
    HU177529B|1981-11-28|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE1225832B|1964-04-14|1966-09-29|Siemens Ag|Electrical protection device against mechanical overloading of hoists|
    US3993166A|1975-04-29|1976-11-23|Bofors America, Inc.|Overload signalling system for fork lift trucks and the like|
    DE2704992A1|1976-04-28|1977-11-17|Munck Continental Sa|OVERLOAD PROTECTION|FR2677629B1|1991-06-17|1998-02-20|Senergy Sarl|METHOD FOR CONTROLLING THE LOAD FOR A LIFTING MACHINE AND DEVICE FOR ITS IMPLEMENTATION.|
    DE19628364C1|1996-07-13|1998-03-05|Matthias Mueller|Limit switch|
    DE19645811C2|1996-11-07|1998-10-01|Stahl R Foerdertech Gmbh|Control arrangement for emergency shutdown|
    DE19645812C1|1996-11-07|1998-02-26|Stahl R Foerdertech Gmbh|Electric hoist with microprocessor control system|
    DE102012010760A1|2012-05-31|2013-12-05|Wolffkran Holding Ag|Electrohydraulic device with three-phase asynchronous motor for adjusting a boom|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    HUAA000929|HU177529B|1979-05-29|1979-05-29|Method for preventing over load of lifting machines and arrangement for implementing this|
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