JP2005060050A - Lifting jack hoisting/lowering system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily grasp an overload or light-load state about each lifting jack by measuring and indicating a load at four points of a vehicular body. <P>SOLUTION: The lifting jack hoisting/lowering system comprises four lifting jacks 11 to 14 supporting a vehicle at four points so as to ascend/descend. A load cell 28 for measuring a vehicular body load is provided in each claw 21, and a measured result of the vehicular body load by the load cell 28 is indicated in an indicating means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lifting jack lifting system that enables load detection while supporting a vehicle body at four points using a lifting jack during inspection of a railway vehicle.

  In a railway vehicle maintenance factory, it is necessary to lift the car body to replace worn wheels, to inspect the vehicle floor, to repair and check equipment and equipment, and to pull out the carriage. There is. Conventionally, a lifting jack has been used as a lifting device for the vehicle body. This lifting jack is installed as a set of 4 groups so as to face each other, and is extended and contracted during various operations as described above, and the body is supported by these claws at 4 points so that it can be raised and lowered repeatedly. ing.

  Moreover, such lifting jacks constitute a lifting jack lifting system with one set of four, and two each of them are arranged at the front and rear sides on both sides of the vehicle body. These lifting jacks automatically control the amount of expansion / contraction (claw lifting / lowering amount) so that the vehicle body supported by each claw maintains an equilibrium state using the detection output of the rotary encoder and proximity switch installed on them. Automatic balancing control).

  However, although the conventional lifting jack lifting system can realize the automatic balance control of the vehicle body by the raising / lowering control of each claw, a different phenomenon may occur for each part (four points) where the vehicle body load is supported by the lifting jack. is there. For this reason, even if the automatic balancing control is performed, the vehicle body load may concentrate on one claw, and the corresponding one lifting jack is overloaded. On the other hand, there has been a problem that one or more of the other lifting jacks are in a light load state or a zero load state, and as a result, the vehicle body may be tilted during ascending.

  The lifting jack lifting system according to the present invention is capable of easily grasping an overload or a light load for each lifting jack by measuring and displaying the vehicle body load at four points with a load cell provided for each of the four lifting jacks. The purpose is to.

  Also, in case of overload or light load, stop the operation of the corresponding lifting jack, or extend or extend it so that each lifting jack can balance the vehicle body at 4 points. Objective.

  In order to achieve the above object, the lifting jack lifting system of the present invention is a lifting jack lifting system including four lifting jacks that support the vehicle body so that the vehicle can be lifted at four points. The lifting jack can lift the vehicle. Each of these claws is provided with a load cell for measuring the vehicle body load, and the measurement result of the vehicle body load by the load cell is displayed on the display means.

  As a result, each load cell measures the load of the vehicle body supported by each claw, and the measurement result is displayed by the display means. Can be determined automatically.

  In addition, since the load detection of the vehicle body is performed on the four claws, even when the vehicle body is tilted so as to float from the claw at one point, the vehicle body is stably supported by the remaining three claws. Work can be performed safely.

  Further, the lifting jack lifting system of the present invention is an operation for controlling the lifting jack so that the lifting of the claw stops when the vehicle body load measured by any of the load cells is zero load or overload. Control means is provided.

  Thereby, when the vehicle body load measured by any one load cell is zero load, the vehicle body load measured by the other load cell is relatively overloaded. Therefore, when the zero load or the overload is measured, the operation control device automatically determines that the vehicle body is tilted, stops and controls the raising and lowering of each claw, and prevents the vehicle body from further tilting.

  Further, the lifting jack lifting system of the present invention is characterized by comprising alarm means for generating an alarm when the vehicle body load measured by any one of the load cells is zero load or overload.

  As a result, the worker can recognize that the vehicle body is tilted abnormally with an alarm sound, etc., and can immediately stop the expansion and contraction of the four lifting jacks by the stop operation. Can be increased.

  Further, the lifting jack lifting system of the present invention is provided with pulse generating means for generating pulses corresponding to the lifting amount of the claw and pulse counting means for counting the generated pulses in the lifting jack, and counting for each lifting jack. The claw is raised and lowered by the operation control means so as to suppress the error between the number of pulses within the set value.

  As a result, balance control of the entire vehicle body supported by the claw can be performed, and in combination with load detection and load control using the load cell, safer lifting and repairing of the vehicle body by the lifting jack lifting system can be performed. realizable.

In the lifting jack lifting system according to the present invention, since the load sensor is installed on the claw that supports the vehicle body at four points, the vehicle body load at the four points can be measured with high accuracy. In addition, since this measurement result is displayed on a display means such as a meter so that it can be seen, the inclination and direction of the vehicle body can be determined at a glance from the difference in the vehicle body load at the four points. For example, the safety of inspection work can be ensured by urgently stopping the expansion / contraction operation of the lifting jack or performing work for correcting the tilt of the vehicle body.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a layout diagram of lifting jacks in the lifting jack lifting system of the present invention, FIG. 2 is a front view of the lifting jack lifting system, and FIG. 3 is a plan view of one lifting jack in the lifting jack lifting system.
As shown in FIG. 1, four lifting jacks 11, 12, 13, and 14 constituting a lifting jack lifting system are symmetrically arranged two by two across a pair of tracks 15 drawn into a maintenance shop. . The vehicle 16 undergoing inspection moves on the track 15 and is stopped in the work area in the maintenance shop.

  Moreover, the lifting jacks 11-14 are arrange | positioned on either side across the vehicle stopped in the work area. These lifting jacks 11 to 14 basically have the same function and configuration, and are arranged to face each other as shown. Therefore, in FIG. 2, the same code | symbol is attached | subjected to the same component of each part of each of the lifting jacks 11-14 arranged oppositely, and the overlapping description is abbreviate | omitted. These lifting jacks 11 to 14 are movable jacks, and a support column 19 is erected on a base 18 supported by a wheel 17, and a motor 20 is provided on the support column 19. A vehicle body elevating claw 21 that is raised and lowered by each motor 20 is attached to each column 19 so as to be raised and lowered. A part of the claw 21 protrudes into a claw shape, which is inserted below the vehicle body 16 and further lifted all at once, whereby the vehicle body 16 can be lifted to a predetermined height as indicated by a chain line. A hydraulic motor may be used in place of the motor (electric) 20.

  Further, a rotary encoder 22 driven via a timing belt stretched between the main shafts of the lifting jacks 11 to 14 is attached to each column 19 as a pulse generating means. The number of output pulses of the rotary encoder 22 corresponds to the amount of raising / lowering (raising and lowering) of the claw 21, and the height position of the claw 21 can be found from the count value of the output pulses (for example, 30 pulses per rotation). Furthermore, in addition to the on-site operation box 23 used for on-site operation, terminal boxes 24 and 25 for drawing in the electric power system wiring are attached to each support column 19. The two tracks 15 for the vehicle 16 are fixed to the stepped portion 27 of the recess 26 that becomes an inspection work space.

  As shown in FIG. 3, a load cell 28 as a load sensor is attached on each claw 21. The details of the mounting structure of the load cell 28 in the claw 21 are as shown in FIG. In FIG. 4, a mounting base 29 is fixed to the mounting top surface of the claw 21 with bolts (not shown), and the mounting base 29 is provided with a cell mounting hole 30 that opens toward the top surface.

  The load cell 28 is fixed to the center portion of the cell mounting hole 30 so as to be screwed. A movable lid member 32 that covers the upper portion of the load cell 28 and is supported by a coil spring 31 and is slidable in the vertical direction is housed in the cell mounting hole 30. Reference numeral 33 denotes a retaining member for the movable lid member 32 that can be locked to the flange portion 32 a of the movable lid member 32, and is fixed to the stepped portion 30 a of the cell mounting hole 30 with a screw 34. The input / output lead 35 of the load cell 28 is led to a circuit device to be described later via a passage 36 cut out in the mounting base 29. The upper portion of the movable lid member 32 protrudes slightly above the upper surface of the mounting base 29. As a result, when the vehicle body is supported by the claw 21, the vehicle body load is reliably applied to the load cell 28, and an electrical signal corresponding to the vehicle body load can be taken out.

  FIG. 5 is a block diagram of a lifting jack control circuit that realizes automatic balancing control and load control of the vehicle body by the lifting jacks 11 to 14 based on the output signals of the load cell 28 and the rotary encoder 22. In the figure, M1, M2, M3, and M4 are motors corresponding to the motor 20, and are provided on the lifting jacks 11 to 14 together with the rotary encoder 22 and the load cell 28.

  In FIG. 5, reference numeral 37 denotes a control board. The control board 37 is provided with a pulse reception counting circuit 38, an error detection control circuit 39, and an operation control circuit 40. Among these, the pulse reception counting circuit 38 functions as pulse counting means, and receives and counts the output pulses of each rotary encoder 22.

  The error detection control circuit 39 determines the error of the expansion / contraction amount (lifting / lowering amount) of each lifting jack 11-14 from the error between the counted values of the counted output pulses (for example, the rotation speed of the main shaft of the lifting jack is two rotations). Is detected. Therefore, when the error in the rotational speed of the spindle becomes two or more, a stop command is immediately issued from the operation control circuit 37 to the motor 20 or the like. The stop command is sequentially issued from the one with the higher rotational speed.

  The operation control circuit 40, which is an operation control means, functions to stop the operation of the motors 20 of the lifting jacks 11 to 14 based on an operation command from a control panel described later, a stop command from the error detection control circuit 39, or the like. To do.

  In FIG. 5, reference numeral 41 denotes an operation panel that can be remotely operated. The operation panel 41 is provided with a position indicator 42, a display device 43, and an operation selection command circuit 44. Among these, the position indicator 42 displays the amount of elevation for each lifting jack, that is, the elevation position relative to the number of pulses counted by the pulse reception counting circuit 38. The display device 43 serving as a display means receives the output of the operation control circuit 40, displays the power supply voltage and load current supplied to the system including the motors 20, displays during operation of the motor 20, manual-automatic operation display, A descent-up operation display, an on-site operation request instruction (operation panel), and the like are performed. Also, alarm means such as a buzzer is installed in the display device 43 or independently of the display device.

  The operation selection command circuit 44 receives the load signal detected by each load cell 28, and outputs a switching signal and command signal for operation panel-on-site operation box, manual-automatic operation, descent-up operation, operation-stop. It functions to output to the operation control circuit 40.

Next, the operation of the lifting jack lifting system will be described.
First, the vehicle 16 is moved into the maintenance shop along the track 15 and stopped in a predetermined work area. Further, as shown in FIG. 1, four lifting jacks 11 to 14 are arranged on both sides of the vehicle 16, and each claw 21 is inserted below the vehicle 16. Next, an operation command is issued by a remote command from the operation panel or by an operation from the field operation box 23 shown in FIG. A command signal based on the operation command is input from the operation selection command circuit 44 to the operation control circuit 40, and the motors 20 of the lifting jacks 11 to 14 are started to drive.

  The claw 21 starts to rise all at once when the motor 20 starts to be driven, and supports the lower portion of the vehicle 16 to lift it. As the claw 21 rises, each rotary encoder 22 linked to the rotation of the main shaft outputs a pulse corresponding to the amount by which the claw 21 rises, and the number of pulses is counted for each rotary encoder 22 by the pulse reception counting circuit. The counting result is displayed on the position indicator 42 as the height position of the claw 21.

  Further, the error detection control circuit 39 detects whether or not the error of each pulse count value for each of the lifting jacks 11 to 14 is within a predetermined value. When it deviates from the predetermined value, a command is issued to the operation control circuit 40, and the driving of the motor 20 is sequentially stopped from the one where the rising amount has advanced. Thus, if the height of each claw 21, that is, the height at the four points of the vehicle 16 is aligned, the ascent is started again, and when reaching a predetermined height, the claw 21 is stopped so as to maintain an equilibrium state at that height position.

  On the other hand, the vehicle 16 supported at four points on each claw 21 presses the load cell 28 installed on the claw 21. The load due to this pressing is applied to the contact of the load cell 28 from the movable lid member 32 shown in FIG. Accordingly, an electric signal corresponding to the vehicle body load is input from each load cell 28 to the operation selection command circuit 44.

  The operation selection command circuit 44 monitors the output from each load cell 28 and monitors the load change, that is, the presence or absence of zero load or overload at each jack point. When there is a zero load or an overload, a control command is issued to the operation control circuit 40. For this reason, the operation control circuit 40 displays on the display device 43 that the vehicle has floated with respect to any claw 21 or that there has been an eccentric (over) load on any claw 21, An alarm (not shown) is activated. Simultaneously with this display and alarm, the driving of the motor 20 is stopped, and the ascent of the vehicle 16 is stopped. As a result, any of the lifting jacks 11 to 14 does not come into contact with the vehicle body, or the vehicle 16 can be prevented from tilting when the vehicle body load is applied to only one vehicle. In this case, it is also possible to raise the lifting jack on the side where the vehicle floats or to lower the lifting jack on the overload side by a manual command from the operation panel.

  Thus, by installing the load cell 28 in each claw 21 and monitoring the load change at the four points of the vehicle 16, the worker can quickly recognize the inclination of the vehicle based on the overload or zero load. The vehicle inspection work can be made safe.

  The present invention measures the vehicle load applied to the four lifting jacks at the time of vehicle repair work by a load cell, and stops the lifting of the vehicle when the vehicle load exceeds a set value, thereby ensuring the safety of the repair work. It can be applied to applications that contribute to

It is arrangement | positioning drawing of the lifting jack in the lifting jack raising / lowering system of this invention. It is a front view which shows the lifting jack raising / lowering system by embodiment of this invention. FIG. 3 is a plan view of one lifting jack shown in FIG. 2. It is sectional drawing which shows the attachment structure of the load cell in this invention. It is a circuit diagram which shows the load control circuit in the lifting jack raising / lowering system of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11-14 ... Lifting jack, 16 ... Vehicle, 20 ... Motor, 21 ... Claw, 22 ... Rotary encoder (pulse generation means) 28, Load cell, 38 ... Pulse reception counting circuit (pulse counting means), 40 ... Operation control circuit ( Operation control device), 43... Display device (display means).

Claims (4)

A lifting jack lifting system comprising four lifting jacks that support the body of a railway vehicle so that it can be lifted at opposite positions,
The lifting jack has a claw that supports the vehicle body so that the vehicle body can be moved up and down, and each claw is provided with a load cell for measuring the vehicle body load, and the measurement result of the vehicle body load by the load cell is displayed on a display means. Lifting jack lifting system.   The vehicle is provided with operation control means for controlling the operation of the lifting jack so that the raising and lowering of the claw is stopped when the vehicle body load measured by any one of the load cells is zero load or overload. The lifting jack raising / lowering system of 1.   2. The lifting jack lifting system according to claim 1, further comprising alarm means for generating an alarm when the vehicle body load measured by any one of the load cells is zero load or overload.   The lifting jack is provided with a pulse generating means for generating a pulse corresponding to the amount of raising and lowering of the claw, and a pulse counting means for counting the generated pulses, and an error between the number of pulses counted for each lifting jack is within a set value. 2. The lifting jack lifting system according to claim 1, wherein the claw is lifted and lowered by operation control means.

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