JP2009102157A - Vehicle lifting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle lifting device regulating lowering of a lift plate part in relation to a height of the lift plate part and presence/absence of return of a plate. <P>SOLUTION: A sequence control unit 6 for controlling a lifting/lowering mechanism of a vehicle lifting device comprises: a height determination unit 6A for determining whether the height of a lift plate part is equal to or less than the regulation height based on the output signals from height detection sensors 5A, 5B; a return determination unit 6B for determining whether a plate is returned to the predetermined position, based on the output signals from return detection sensors 8A, 8B; a lowering regulation determination unit 6C in which the return determination unit 6B determines whether the plate is returned to the predetermined position by the detection sensor 8B when the height determination unit 6A determines that the height of the lift plate part is equal to or less than the regulation height; and a lowering regulation unit 6D for regulating the lowering operation of the lifting/lowering mechanism when the lowering regulation determination unit 6C determines that the height of the lift plate part is equal to or less than the regulation height, and the plate is not returned. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle lift device in which a plate that slides and / or turns is attached to a lift plate portion and lifts the vehicle in accordance with the size in the vehicle front-rear direction and the vehicle width direction, and in particular, the plate is in its original position. The present invention relates to a vehicle lift device that is regulated so that the lift plate portion is not lowered when it is not returned.

  Since a wide variety of automobiles such as a vehicle having a wide vehicle width and a vehicle that is long in the front-rear direction have been developed, the vehicle lift devices have various sizes as disclosed in Patent Documents 1 and 2. Some can lift the vehicle.

  FIG. 6 is a perspective view of the lift plate portion 101 in such a vehicle lift device 100, and FIG. 7 shows a state in which the lift plate portion 101 in the vehicle lift device 100 is slightly raised from the floor surface or the ground by the lifting mechanism 102. It is a schematic diagram which shows.

  A conventional vehicle lift device 100 includes a pair of lift plate portions 101 and 101 on which a vehicle 200 is placed, and an elevating mechanism 102 that moves the lift plate portion 101 up and down, respectively. A plate 103 is attached so as to be pivotable. The lift plate portion 101 can be adjusted to the size of the vehicle 200 by manually sliding and / or turning the plate 103. In the vehicle lift device 100, as shown in FIG. 7, the accommodating portion 104 is arranged on the floor or the ground, and the pair of lift plate portions 101, 101 are raised from the accommodating portion 104 by the respective lifting mechanisms 102, The plate 103 of the lift plate 101 can be slid and / or turned in the longitudinal direction at a position where the pair of lift plates 101 and 101 are slightly raised from the floor or the ground.

JP 2005-41681 A JP 2004-323181 A

  In the conventional vehicle lift device 100 shown in FIGS. 6 and 7, when the lift plate unit 101 is lowered by the elevating mechanism 102 and stored in the storage unit 104, the plate 103 is not necessarily returned to the original position of the lift plate unit 101. It may not be. In this case, as shown by an arrow in FIG. 7, when the lift plate portion 101 is lowered by the lifting mechanism 102, the plate 103 hits the floor surface or the ground.

  Therefore, in the vehicle lift device of Patent Document 1, a plate return detection sensor is attached to the lift plate portion to detect whether or not the plate is returned to the initial state. Further, Patent Document 1 discloses that a position sensor for detecting the height of the lift plate portion is attached to the vehicle lift device, and the lifting mechanism is stopped when the lift plate portion reaches a predetermined height.

  However, when the lifting mechanism descends the lift plate portion, the relationship between the height of the lift plate and the presence or absence of the return of the plate is not considered at all. Moreover, when raising and lowering a pair of lift plate part synchronizing, only the plate of one lift plate part may be returned, and the case where the reverse side plate is not returned may also arise. Then, the plate of the lift plate portion does not enter the housing portion and hits the floor surface or the ground.

  Therefore, the present invention further improves the vehicle lift device that has been developed by the present applicant, and relates to the height of the lift plate portion and whether or not the plate is returned, so that the lowering of the lift plate portion can be regulated. The purpose is to provide.

  In order to achieve the above object, the present invention provides a vehicle lift apparatus comprising: a lift plate portion on which a vehicle is placed; a lifting mechanism that moves the lift plate portion up and down; and a control unit that drives and controls the lifting mechanism. The plate portion includes a lift plate main body supported by the lifting mechanism and a plate attached to the lift plate main body so as to be slidable and / or pivotable. The plate portion detects the return of the sliding and / or pivoting of the plate. A detection sensor is attached to the lift plate main body, a height detection sensor for detecting the height of the lift plate portion is attached to the lifting mechanism, and the control unit determines the height of the lift plate portion based on the output signal from the height detection sensor. Based on the output signal from the height detector and the return detection sensor When the height determination unit determines that the lift plate unit is below a specified height, the return determination unit detects whether the plate is set to the predetermined position by the return detection sensor. A lowering restriction determination unit that determines whether or not the position is returned to the position, and a lowering restriction determination unit that determines that the lift plate part is equal to or lower than a predetermined height and that the plate is not returned, the lowering operation of the lifting mechanism is performed. And a descending restricting portion for restricting. In particular, the return detection sensor is provided toward the upper part of the center of the lift plate main body in the sliding direction of the plate.

  With the above configuration, the height determination unit determines whether or not the height of the lift plate portion is below a specified height based on the output signal from the height detection sensor, and the return determination unit outputs from the return detection sensor. Based on the signal, it is determined whether or not the plate is returned to a predetermined position. Upon receiving these determination results, the lowering restricting determination unit determines that the height of the lift plate portion is less than a specified height and determines that the plate has not been returned to the predetermined position. To regulate. Therefore, when an accommodating part is provided under the floor or in the ground and the lift plate part is accommodated therein, the plate is not lowered to be accommodated in the accommodating part while being slid and / or turned.

  According to the vehicle lift device of the present invention, when the lift plate portion is lowered by the elevating mechanism, when the height of the lift plate portion is less than the specified level, the lift plate portion is lowered when the plate is not returned. It is regulated, and the lift plate portion can be accommodated in the accommodating portion without the plate hitting the floor or the ground.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic view of a vehicle lift device according to an embodiment of the present invention. As shown in FIG. 1, the vehicle lift device 1 includes a lift plate portion 2 and a pair of lifting mechanisms 3 that support the lift plate portion 2 to move up and down. When the vehicle lift device 1 supplies electricity to the housing portions 4 and 4 that house the lift plate portions 2 and 2, the hydraulic control unit 5 that drives and controls the pair of lifting mechanisms 3 and 3, and the vehicle lift device 1. At the same time, a sequence control unit 6 that electrically performs sequence control on the lifting mechanism 3 is provided. An operation pendant 7 is wired to the sequence control unit 6 and indirectly sends an operator command to the sequence control unit 6 including control over the hydraulic control unit 5.

  FIG. 2 is a schematic diagram showing the pair of lift plate portions and the pair of lifting mechanisms shown in FIG. As shown in FIG. 2, each elevating mechanism 3 includes a fixed guide portion 31 embedded in the basement or under the floor, a mast portion 32 inserted into the fixed guide portion 31 and moving up and down, and a central vertical axis of the mast portion 32. And a power unit 33 that is inserted above and moves up and down the mast unit 32.

  The power unit 33 is configured by attaching a piston rod 33C to a piston 33B in the cylinder 33A. As shown in FIG. 2, the bottom portion of the cylinder 33 </ b> A is fixed to the bottom portion of the fixed guide portion 31, and the piston rod 33 </ b> C is fixed to the upper portion of the mast portion 32. Note that the cylinder may be fixed to the upper portion of the mast portion 32 and the tip of the piston rod may be fixed to the bottom portion of the fixed guide portion 31 until the configuration shown in FIG. The hydraulic piping from the hydraulic control unit 5 is connected in series to the pair of power units 33. For example, as shown in FIG. 2, one pipe 9 </ b> A from the hydraulic control unit 5 is connected to the lower chamber of the cylinder 33 </ b> A in one power unit 33. The other pipe 9 </ b> B from the hydraulic control unit 5 is connected to the upper chamber of the cylinder 33 </ b> A in the other power unit 33. A pipe 9 </ b> C between the pair of power units 33 and 33 is connected to an upper chamber of the cylinder 33 </ b> A in one power unit 33 and a lower chamber of the cylinder 33 </ b> A in the other power unit 33. A pressure switch 9 is connected to the pipe 9C. Then, as indicated by an arrow in FIG. 2, the control oil from the hydraulic control unit 5 flows into the lower chamber of one power unit 33 via the pipe 9A, and the control oil in the upper chamber in the one power unit 33 flows into the pipe 9C. Then, the control oil flows from the upper chamber of the other power unit 33 to the hydraulic control unit 5 via the pipe 9B. Accordingly, the vertical movements of the pair of lifting mechanisms 3 and 3 are synchronized, and the pair of lift plate portions 2 and 2 are always at the same height. The pressure switch 9 detects whether the vertical movements of the pair of lift plate portions 2 and 2 are synchronized.

  Each elevating mechanism 3 is provided with a function for stopping the rotation of the gear meshing with the rack 34 in order to prevent the fall. The fall prevention release for detecting that the fall prevention function is released by making the rotation of the gear free. A sensor 3A is attached.

  A height detection sensor for detecting the height of the lift plate portion 2 is attached to the lifting mechanism 3. Multiple height detection sensors are installed as necessary. For example, as the first height detection sensor 5A, a sensor that detects whether the lift plate portion 2 has a predetermined height, for example, 60 mm or more from the floor or the ground, or as the second height detection sensor 5B, the lift plate A sensor for detecting that the part 2 is accommodated in the accommodating part is attached. These height sensors are attached to predetermined locations of the elevating mechanism 3, for example, predetermined locations of the fixed guide portion 31 or the mast portion 32 via brackets (not shown). The second height detection sensor 5 </ b> B detects whether or not the lift plate unit 2 is stored in the storage unit 4, and may be attached to the bottom of the lift plate unit 2 or the storage unit 4.

  FIG. 3 is a schematic perspective view of the lift plate portion 2 shown in FIG. The lift plate portion 2 has a pair of plates 22 and 22 attached to a lift plate body 21 so as to be slidable and / or pivotable. Here, each of the plates 22 and 22 can be slid only along the front-rear direction of the vehicle mounted on the lift plate main body 21, or can only turn, or both sliding and turning are possible. It may be. In the present embodiment, a return detection sensor 8 that detects whether or not the plate 22 is in an original state, that is, a state in which neither sliding nor turning is attached, is attached to the lift plate portion 2. Specifically, the return detection sensor 8 is attached to the center upper part 23 of the lift plate main body 21 in the sliding direction of the plate 22. The return detection sensor 8 is provided for each plate 22. In the vehicle lift device 1 shown in FIG. 1, a return detection sensor 8 </ b> A for detecting a return to the front plate 22 and a return detection sensor 8 </ b> B for detecting a return to the rear plate 22 are provided in one lift plate portion 2. A return detection sensor 8 </ b> A that detects a return to the rear plate 22 and a return detection sensor 8 </ b> B that detects a return to the rear plate 22 are provided in the other lift plate portion 2.

  FIG. 4 is a diagram showing a block configuration of the hydraulic control unit 5 and the sequence control unit 6 as control units. The hydraulic control unit 5 is configured by piping connection between a hydraulic tank 51, a motor-controlled pump 52, and a direction control valve 53, and injects and discharges power oil to and from the power unit 33 of the lifting mechanism 3. . The direction control valve 53 has both an ascending valve and a descending valve. Here, the ascending valve is a valve that causes the elevating mechanism 3 to perform an ascending operation, and the descending valve is a valve that causes the elevating mechanism 3 to perform a descending operation. The direction control valve 53 has four ports. One of the two input ports of the directional control valve 53 flows in the control oil pumped from the hydraulic tank 51 by the pump 52, and the other is directly connected to the hydraulic tank 51 and discharges the control oil to the hydraulic tank 51. One of the two output ports of the directional control valve 53 is connected to the pipe 9A shown in FIG. The other is connected to a pipe 9B shown in FIG. The direction control valve 53 starts to be driven by excitation and functions as an ascending valve and a descending valve.

  The sequence control unit 6 includes a height determination unit 6A, a return determination unit 6B, a descent restriction determination unit 6C, and a descent restriction unit 6D. The height determination unit 6A determines whether or not the height of the lift plate unit 2 is equal to or less than a specified height based on output signals from the height detection sensors 5A and 5B. The return determination unit 6B determines whether or not all the plates 22 have been returned to the predetermined positions based on the output signals from the return detection sensors 8A and 8B. When the height determining unit 6A determines that the lift plate unit 2 has a height equal to or less than a specified level, the return determining unit 6B determines that all the plates 22 are predetermined by all the return detection sensors 8A and 8B. It is determined whether or not it has been returned to the position. The lowering restriction part 6D restricts the lowering operation of the pair of lifting mechanisms 3 and 3 when it is determined that the lift plate part 2 is equal to or lower than the predetermined height and all the plates 22 are not returned to the original positions.

  Hereinafter, the procedure and operation | movement which raises / lowers a vehicle using the vehicle lift apparatus 1 which concerns on embodiment of this invention are demonstrated. Although the present invention is characterized by the lowering restriction, the procedure and operation for lifting the vehicle will be described first, and then the procedure and operation for lowering the vehicle will be described.

Use the following procedure to lift the vehicle.
First, the pair of lift plate portions 2 and 2 are taken out from the accommodating portions 4 and 4 by the pair of elevating mechanisms 3 and 3, and the plates 22 and 22 are slid and / or turned according to the size of the vehicle to be placed. Next, the vehicle is straddled across the pair of lift plate portions 2, 2, and a block or the like is sandwiched between the vehicle rocker and the lift plate portions 2, 2. Then, by operating the operation pendant 7, the pair of lifting mechanisms 3, 3 raise the pair of lift plate portions 2, 2. Thereby, inspection and repair of a vehicle can be performed easily.

Follow the procedure below to lower the vehicle. FIG. 5 is a flowchart showing the operation of the vehicle lift device 1 when the pair of lift plate portions 2 and 2 are lowered.
First, when the operator presses the lowering button of the operation pendant 7 (STEP 1-1), a lowering command for the pair of lift plate portions 2 and 2 is sent from the operation pendant 7 to the sequence control unit 6. Then, the motor of the pump 52 rotates to prepare for sending the control oil to the power unit 33 (STEP 1-2), and the direction control valve 53 provided between the pump 52 and the power unit 33 is excited to pump the pump. The control oil sent by 52 is sent to the power unit 33 and the fall prevention function of the elevating mechanism 3 is released (STEP 1-3).

  Next, when the sequence control unit 6 receives an output signal related to the fall prevention release by the fall prevention release sensor 3A (Yes in STEP1-4), the direction control valve 53 is caused to function as a descending valve (STEP1-5). By this series of flows, when the mast portion 32 is lowered while being inserted into the fixed guide portion 31 and the mast portion 32 is lowered to the lower end portion of the fixed guide portion 31, a second height detection sensor as a lower end detection sensor. 5B is turned on (Yes in STEP 1-6), the directional control valve 53 is set to neutral, the lowering valve is turned off, and the flow of control oil between the pair of power units 33 and the hydraulic tank 51 is interrupted, The lowering operation of the pair of lifting mechanisms 3 is terminated (STEP 1-7).

  Since the sequence control unit 6 receives the input of the lowering command from the operation pendant 7, the sequence determination unit 6A performs the series of lowering operations of STEP1-2 to STEP1-6, while the height determination unit 6A detects the first and second heights. The position of the lift plate portion 2 is determined while receiving output signals from the sensors 5A and 5B as needed, and the return determination portion 6B receives output signals from the return detection sensors 8A and 8B as needed and each plate 22 is at a predetermined original position. It is always determined whether it has been returned to (STEP 2-1). The sequence control unit 6 determines that the height determination unit 6A determines the position of the lift plate unit 2 to be a predetermined height, for example, 60 mm or less from the floor or the ground (Yes in STEP2-2), and the return determination unit 6B If it is determined by the output signals from the return detection sensors 8A and 8B of each plate 22 that all the plates 22 have not been returned (YES in STEP 2-3), the operations of STEP 1-2 to STEP 1-6 described above are interrupted ( (STEP2-4). The interruption of this operation is an operation for regulating the lowering, and the hydraulic control for the power unit 33 is interrupted. Specifically, for example, the injection of hydraulic pressure from the pump 52 to the power unit 33 in one lifting mechanism 3 is stopped, and the outflow of hydraulic pressure from the power unit 33 in the other lifting mechanism 3 is stopped. Thereby, the descent of the pair of elevating mechanisms 3 and 3 can be stopped.

  As described above, in the vehicle lift device 1, the sequence control unit 6 determines that the height of the lift plate unit 2 is less than the specified height based on the output signals from the first and second height detection sensors 5A and 5B. When the pair of plates 22 and 22 are not returned to the predetermined positions based on the output signals from the return detection sensors 8A and 8B, the lowering operation is stopped. Therefore, the operator cannot lower the lift plate portion 2 so as to be accommodated in the accommodating portion 4 in a state in which all the plates 22 of the lift plate portion 2 are not returned to the original state, that is, in a state where the lift plate portion 2 remains slid and / or turned. Can not. That is, since the lowering operation of the lift plate portion 2 is restricted, the operator notices that the plate 22 is in a sliding and / or turning state. Thereby, the operator returns all the plates 22 to the original state in which neither the slide nor the turn is performed, and, for example, the lowering button of the operation pendant 7 is pressed. Then, since a signal for canceling the lowering restriction is input to the lowering restriction part 6D, the pair of lifting mechanisms 3, 3 lowers the pair of lift plate parts 2, 2, and the pair of lift plate parts 2, 2 2 can be safely accommodated in the accommodating portion 4.

  As described above, the vehicle lift device 1 shown in FIG. 1 has been described. However, it is not always necessary that the lift plate portion and the lifting mechanism are configured in a pair in the vehicle width direction of the vehicle, and the vehicle lift device is a single lift plate portion. Even if it is moved up and down by one lifting mechanism, the lowering restriction control in the present invention can be applied. In the above description, a case where each lift plate portion is provided with a pair of plates that can slide and / or pivot is described. However, only one plate can slide and / or pivot on the lift plate portion. Even if it is not attached, the descent restriction control in the present invention can be applied.

It is the schematic of the vehicle lift apparatus which concerns on embodiment of this invention. It is a schematic diagram which shows a pair of lift plate part and a pair of raising / lowering mechanism of FIG. It is a schematic perspective view of the lift plate part shown in FIG. It is a figure which shows the block configuration of the hydraulic control part and sequence control part as a control part. It is a flowchart which shows operation | movement of the vehicle lift apparatus in the case of lowering a pair of lift plate part. It is a perspective view of the lift plate part in the conventional vehicle lift apparatus. FIG. 7 is a schematic diagram showing a state in which the lift plate portion is slightly raised from the floor surface or the ground by the lifting mechanism in the vehicle lift device shown in FIG. 6.

Explanation of symbols

1: Vehicle lift device 2: Lift plate part 3: Elevating mechanism 3A: Fall prevention release sensor 4: Storage part 5: Hydraulic control part 5A, 5B: Height detection sensor 6: Sequence control part 6A: Height determination part 6B: Return determination unit 6C: Descent restriction determination unit 6D: Descent restriction unit 7: Operation pendant 8, 8A, 8B: Return detection sensor 9: Pressure switch 9A, 9B, 9C, 54, 55: Piping 21: Lift plate body 22: Plate 23: Upper part 31: Fixed guide part 32: Mast part 33: Power part 33A: Cylinder 33B: Piston 33C: Piston rod 34: Rack 51: Hydraulic tank 52: Pump 53: Directional control valve

Claims (2)

In a vehicle lift device comprising: a lift plate portion on which a vehicle is placed; a lifting mechanism that moves the lift plate portion up and down; and a control unit that drives and controls the lifting mechanism.
The lift plate portion is composed of a lift plate body supported by the lifting mechanism, and a plate attached to the lift plate body so as to be slidable and / or pivotable.
A return detection sensor for detecting the return of sliding and / or turning of the plate is attached to the lift plate body,
A height detection sensor for detecting the height of the lift plate portion is attached to the lifting mechanism,
The control unit includes a height determination unit that determines whether the height of the lift plate unit is equal to or lower than a specified height based on an output signal from the height detection sensor, and an output from the return detection sensor. A return determination unit for determining whether or not the plate is returned to a predetermined position based on a signal, and the return determination unit when the height determination unit determines that the lift plate unit has a height less than a specified level. Is a lowering restriction determination unit that determines whether or not the plate is returned to a predetermined position by the return detection sensor, and the lowering when the lift plate part is not more than a predetermined height and the plate is not returned. A vehicle lift device, comprising: a lowering restricting part that restricts the lowering operation of the elevating mechanism when the restriction determining part determines.   2. The vehicle lift device according to claim 1, wherein the return detection sensor is provided toward a sliding direction of the plate with respect to a central upper portion of the lift plate main body.

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