JP2017154854A - Vehicle lifting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize falling prevention of an elevation part upon occurrence of irregularity.SOLUTION: A vehicle lifting apparatus comprises a swing arm 31 which extends along a prop 11 and may rotate on an upper edge part as the center, a falling prevention motor 34 rotating the swing arm 31, and an electromagnetic clutch 36 transmitting driving power generated by the falling prevention motor 34 to the swing arm 31. When an elevation part 12 is lifted along the prop 11, the elevation part 12 is lifted while pushing up a dog 32 arranged on the swing arm 31. When the elevation part 12 falls down, the driving power by the falling prevention motor 34 is transmitted to the swing arm 31 via the electromagnetic clutch 36 and a lower edge of the swing arm 31 is rotated in a direction away from the elevation part 12, there by the dog 32 is put into non-contacting state to the elevation part 12. In a case where irregularity occurs while falling down of the elevation part 12, the electromagnetic clutch 36 is released and the lower edge of the swing arm 31 is rotated in a direction closing to the elevation part 12, thereby the dog 32 supports the elevation part 12 from below.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle lifting apparatus.

  Conventionally, as a technique in such a field, there is JP-A-2005-059702. The vehicle lifting apparatus described in this publication is connected to a pair of support columns arranged so as to sandwich a vehicle transported along a transport rail, a lifting unit that moves up and down along the pair of support columns, and a lifting unit. And a tire support part that supports the lower part of the tire.

  By using this vehicle lifting device, the vehicle transported in the vicinity of the floor is raised, the operator enters the lower part of the vehicle and performs work around the lower part of the vehicle body, and then the vehicle is lowered to the vicinity of the floor. Can be continued.

JP-A-2005-059702

However, in the process of operation in the conventional vehicle lifting apparatus described above, the worker enters the lower part of the vehicle while the vehicle is lifted, so that the worker remains in the lower part of the lifting unit when the vehicle is lowered. there's a possibility that. Moreover, when the worker who performs maintenance is working in the lower part of the lifting / lowering part, there is a possibility that the lifting / lowering part may fall due to breakage of the brake or connection mistake. Therefore, it is necessary to prevent the elevating unit from falling when the emergency stop button is pressed regardless of whether the elevating unit is moving up or down. Here, as shown in FIG. 7, when performing the fall prevention of the elevating unit using the ratchet mechanism, because the mechanism forcibly releases the ratchet to the position outside the interference by energization by the actuator during the lowering of the elevating unit, When an abnormality such as a power supply down occurs during the descent, there is a problem that the fall prevention cannot be performed. Therefore, when performing an emergency stop, it has been desired to prevent the elevating unit from falling while being cut off from power.
The present invention provides a vehicle elevating device that prevents the elevating part from falling regardless of whether it is rising or descending.

A vehicle lifting / lowering device according to the present invention is a vehicle lifting / lowering device that lifts and lowers a lifting / lowering portion that supports a vehicle along a pair of columns, and extends along the columns and rotates around an upper end portion. A swing arm, a fall prevention motor that rotates the swing arm, and an electromagnetic clutch that transmits a driving force generated by the fall prevention motor to the swing arm. The elevating part rises while being pushed up in contact with a dog provided on the swing arm, and when the elevating part descends, the driving force of the fall prevention motor is applied to the swing arm via the electromagnetic clutch. When the lower end of the swing arm is rotated in a direction away from the lifting / lowering portion, the dog is brought into non-contact with the lifting / lowering portion. When an abnormality occurs in descending, the electromagnetic clutch is disengaged, to rotate in a direction in which the lower end of the swing arm approaches the elevating unit, wherein the dog is to support the lifting portion from below.
Thereby, even if it is a case where abnormality generate | occur | produces during the descent | fall, the fall of a raising / lowering part can be prevented.

  Accordingly, it is possible to realize a vehicle lifting / lowering device that prevents the lifting / lowering portion from dropping regardless of whether the vehicle is rising or descending.

It is a figure which shows the external appearance of a vehicle raising / lowering apparatus. It is the figure which looked at the left raising / lowering apparatus from the X direction. It is the figure which looked at the left side lifting device from the Y direction. It is a figure which shows the state which an raising / lowering part raises. It is a figure which shows the state which a raising / lowering part descends. It is a figure which shows the state which an abnormality generate | occur | produces when the raising / lowering part is falling, and descent | fall stops. It is a figure which shows the related ratchet mechanism.

Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the vehicle lifting apparatus 1 includes a pair of support columns 11 arranged on the left and right sides of the conveyed vehicle, a lifting unit 12 that moves up and down along the support columns 11, a tire support, and a lifting unit. 12 is provided with a tire support portion 13 that raises and lowers the vehicle by moving up and down in conjunction with the raising and lowering of 12, and a ratchet mechanism portion 14 that extends along the column 11 and is rotatable about the upper end portion. The vehicle elevating device 1 is formed by a left elevating device 2 for placing and lifting a tire disposed on the left side of the vehicle, and a right elevating device 3 for placing and lifting a tire disposed on the right side of the vehicle. Has been. The left elevating device 2 and the right elevating device 3 are opposed to each other with the conveyed vehicle interposed therebetween, and have the same configuration. In the following description, the vehicle is assumed to be a four-wheeled vehicle. Moreover, about the left raising / lowering apparatus 2 and the right raising / lowering apparatus 3, let the vehicle side pinched | interposed be an X direction inner side, and let the front side of the vehicle conveyed be a Y direction front side.

  The support | pillar 11 is arrange | positioned so that the conveyance line in which a vehicle is conveyed may be pinched | interposed. In other words, the left lifting device 2 and the right lifting device 3 are each provided with one column 11. As shown in FIG. 2, the support | pillar 11 is provided so that it may extend in the up-down direction on a floor, for example, may extend longer than two vehicles height. The support column 11 is connected to the motor unit 21 and the elevating unit 12, and is operated by power supplied from the motor unit 21. The elevating unit 12 is operated only in the vertical direction along the support column 11. A linear motion (LM) guide 23 for guiding, and an absolute coder 24 that detects the state of each ball screw portion 22 of the left elevating device 2 and the right elevating device 3 and synchronizes the operation thereof.

  The motor unit 21 includes a motor 21a that provides rotational power to the ball screw unit 22, and a speed reducer 21b that decelerates the rotation of the rotation shaft of the motor 21a. The reduced rotation of the rotating shaft of the motor 21 a is transmitted to the ball screw portion 22.

  The ball screw portion 22 includes a ball screw 22a extending in the vertical direction (Z direction) in the support column 11, and a nut 22b attached to the ball screw 22a. The nut 22 b is connected to the elevating part 12. An absolute coder 24 is connected to the lower side of the ball screw 22a. The ball screw 22a rotates around the Z direction by the rotation of the rotation shaft of the motor 21a of the motor unit 21. The nut 22 b is connected to the elevating part 12. The nut 22b moves up and down by moving up and down according to the rotation of the rotation shaft of the motor 21a.

  The LM guide 23 is arranged extending in the Z direction along the ball screw 22a. The LM guide 23 is connected to the elevating unit 12 in a slidable state, and guides the movement of the elevating unit 12 in the Z direction.

  The absolute coder 24 is disposed at the lower part of the support 11. For example, the absolute coder 24 is a position detector that measures the position of the nut 22 b of the ball screw portion 22. Based on the position information detected by each absolute coder 24 provided in the left lifting device 2 and the right lifting device 3, the lifting and lowering units 12 of the left lifting device 2 and the right lifting device 3 are moved up and down so as to coincide with each other. The vertical movement of the unit 12 is controlled.

  As shown in FIG. 1, the elevating unit 12 extends in the front-rear direction (Y direction) of the vehicle being conveyed, which is perpendicular to the column 11. The elevating part 12 is disposed on the inner side of the support column 11. The central part of the elevating part 12 is connected to a nut 22 b of the ball screw part 22. The elevating unit 12 moves up and down with the operation of the nut 22b. A tire support portion 13 is connected to front and rear ends of the elevating portion 12.

  The tire support portion 13 extends in the Z direction, and an upper end is connected to the Y direction end portion of the elevating portion 12, and the tire support portion 13 is connected to the lower end of the connection portion 13 a and protrudes inwardly. A placement unit 13b.

  In the mounting portion 13b, two rollers extending in the left-right direction (X direction) of the vehicle are provided in parallel. A vehicle tire is placed between the two rollers. That is, the vehicle ascends as the elevating unit 12 rises in a state where the tires are placed on the four placing portions 13b, two at each of the left lifting device 2 and the right lifting device 3, respectively.

  As shown in FIGS. 2 and 3, the ratchet mechanism 14 is connected to the front side in the Y direction of the column 11 and is provided along the column 11. The ratchet mechanism 14 is provided at the lower end of the swing arm 31, a swing arm 31 that is pivotally connected to the support 11, a plurality of dogs 32 that are continuously provided in the Z direction on the swing arm 31, and the swing arm 31. Swing rack 33, drop prevention motor 34 provided below swing arm 31, swing gear 35 that rotates by the operation of drop prevention motor 34, and electromagnetic that changes the contact state of swing rack 33 and swing gear 35. A clutch 36, a closing sensor 37 that detects that the swing arm 31 is in a closed state, which will be described later, and an opening sensor 38 that detects that the swing arm 31 is in an opened state, which will be described later.

  The swing arm 31 is an arm extending in the Z direction. The swing arm 31 rotates around the Y axis with the vicinity of the upper end portion as the center of the rotation axis. By this rotation, the state where the lower end of the swing arm 31 is closer to the inner side in the X direction and the longitudinal direction is substantially vertical is the closed state, and the state closer to the outer side in the X direction is the open state. The swing arm 31 is closed by its own weight when the swing rack 33 and the swing gear 35 are disengaged by the electromagnetic clutch 36 in the open state.

  The dog 32 is provided continuously in the Z direction in the vicinity of the inside of the front surface of the swing arm 31 in the Y direction. The plurality of dogs 32 include a dog body portion 32a, a rotation shaft 32b, and a stopper 32c. The dog main body 32a is substantially triangular when viewed from the front side in the Y direction, and is connected to the swing arm 31 by a rotation shaft 32b provided in the Y axis direction. A part of the dog main body 32 a protrudes inward in the X direction from the swing arm 31.

  When the swing arm 31 is in the closed state and the elevating part 12 performs the elevating motion, the dog main body part 32a is arranged so that the protruding part 32d protruding inward in the X direction comes into contact. The stopper 32c supports one side of the substantially triangular dog body portion 32a. The stopper 32c fixes the dog body 32a so that it does not rotate when the elevating part 12 is lowered and the protruding part 32d is pressed downward from the top when the swing arm 31 is in the closed state. The stopper 32c does not hinder the dog body 32a from rotating around the rotation shaft 32b when the elevating part 12 is raised and the protrusion 32d of the dog body 32a is pushed up from below.

  The plurality of dogs 32 that are continuous in the vertical direction are arranged so that each of the left and right lifting devices 2 and 3 has the same height. That is, on the dog main body portion 32a arranged at the same height in the left elevating device 2 and the right elevating device 3, the lower portions of the elevating units 12 are fixed in contact with the dog main body portion 32a of the dog 32 having the same height. In this case, the four tire support portions 13 are arranged at substantially the same height, and the vehicle is kept in a substantially horizontal state.

  Further, even when the elevating part 12 is fixed on the dog 32 arranged at a height different by one in the left elevating apparatus 2 and the right elevating apparatus 3, the vehicle does not fall from the tire support part 13. As described above, the intervals between the plurality of dogs 32 in the Z direction are sufficiently narrow. For example, in the left elevating device 2, the elevating unit 12 abuts on the second dog 32 from the top, and in the right elevating device 3, the elevating unit 12 abuts and is fixed on the third dog 32 from the top, Even when the tire support portion 13 that holds the tire is fixed in a lower state than the tire support portion 13 that supports the tire on the left side of the vehicle, the vehicle does not fall from the tire support portion 13.

  The swing rack 33 is provided in an arc shape so as to extend substantially in the X direction below the swing arm 31. The teeth provided on the lower side of the swing rack 33 engage with the teeth of the swing gear 35 when the electromagnetic clutch 36 is in the ON state. The swing rack 33 is disconnected from the swing gear 35 when the electromagnetic clutch 36 is in the OFF state.

  The fall prevention motor 34 is disposed below the swing rack 33 and has a rotation shaft in the Y direction. The fall prevention motor 34 rotates the swing gear 35. Specifically, when the swing gear 35 is engaged with the swing rack 33, the fall prevention motor 34 moves the swing rack 33 to the outside in the X direction by the driving force, so that the swing arm 31 in the closed state is closed. Is operated to open. In other words, when the driving force of the fall prevention motor 34 is transmitted from the swing gear 35 to the swing rack 33 via the electromagnetic clutch 36, the swing arm 31 rotates in a direction in which the lower end moves away from the elevating unit 12.

  The swing gear 35 is a gear connected to the rotation shaft of the fall prevention motor 34. The swing gear 35 is disposed below the swing rack 33.

  The electromagnetic clutch 36 is connected to the fall prevention motor 34 and is in a state where the swing rack 33 and the swing gear 35 are engaged when energized and in the ON state. The electromagnetic clutch 36 is in a disconnected state when the energization is cut off and in the OFF state, and the engagement state of the swing rack 33 and the swing gear 35 is released. The electromagnetic clutch 36 is deenergized when the emergency stop switch is pressed or when a power failure occurs.

  When the swing arm 31 is in the closed state, the closing sensor 37 is disposed so as to face a portion closer to the inside in the X direction of the swing rack 33. For example, the closing sensor 37 detects that the swing arm 31 is in a closed state by detecting a state in which the swing arm 31 is facing.

  The open limit sensor 38 is disposed so as to face the swing rack 33 when the swing arm 31 is in the open state. For example, the open limit sensor 38 detects that the swing arm 31 is in an open state by detecting a state in which the swing arm 31 is opposed.

  Next, with reference to FIGS. 4-6, the operation | movement at the time of raising / lowering the raising / lowering part 12 in normal time, and the operation | movement at the time of abnormality occurrence are demonstrated.

  As shown in FIG. 4, when the elevating unit 12 is raised, the swing arm 31 is in a closed state. The lifting unit 12 moves up while pushing up the dog 32 according to the operation of the motor unit 21. At this time, the dog main body 32a is pushed up by the elevating part 12 and rotates around the rotation shaft 32b, so that the elevating part 12 is not hindered.

  When an abnormality occurs while the elevating part 12 is raised and the elevating part 12 falls, the lower part of the elevating part 12 comes into contact with the protruding part 32d of the dog main body part 32a. At this time, the rotation of the dog main body 32a is fixed by the stopper 32c. Therefore, since the lower end of the elevating unit 12 is supported by the dog 32, further dropping is prevented.

  As shown in FIG. 5, when the elevating unit 12 descends as a normal operation, the electromagnetic clutch 36 is energized and the swing rack 33 and the swing gear 35 are engaged. The fall prevention motor 34 is driven. As a result, the swing arm 31 is in an open state in which the lower end portion is moved outward in the X direction, and the dog 32 provided on the swing arm 31 is not in interference with the elevating unit 12. Thereafter, the ball screw portion 22 is operated by the operation of the motor portion 21, and the elevating portion 12 is lowered. Thereby, the raising / lowering part 12 descend | falls in the state which the dog 32 does not contact.

  As shown in FIG. 6, when an abnormality occurs while the elevating unit 12 is lowered and the energization is interrupted and the elevating unit 12 falls, the electromagnetic clutch 36 is disconnected, and the swing rack 33 and the swing gear are separated. The engagement state of 35 is released. As a result, the swing arm 31 is rotated in the direction in which the lower end approaches the lifting unit 12 by its own weight, and is changed from the open state to the closed state. Thereafter, the lower part of the elevating part 12 comes into contact with the protruding part 32d of the dog body part 32a, and the rotation of the dog body part 32a is fixed by the stopper 32c. Thereby, since the raising / lowering part 12 is supported from the downward direction by the dog 32, the fall further is prevented.

  Here, for example, it takes about 1 second for the swing arm 31 to change from the open state to the closed state by its own weight. However, since the vertical movement of the elevating part 12 is performed by a ball screw, the resistance when the elevating part 12 descends from the open state to the closed state of the swing arm 31 is large. Can do.

  Thereby, regardless of whether the elevating unit 12 is rising or descending, it is possible to prevent the elevating unit from falling when an abnormality occurs and power is interrupted. Therefore, a worker below the vehicle placed on the vehicle lifting / lowering device 1 and a maintenance worker working below the lifting unit 12 can work more safely.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, the swing rack 33 is provided at the lower end of the swing arm 31, and the fall prevention motor 34 and the swing gear 35 have been described as being disposed below the swing arm 31. As long as the swing arm 31 is opened, the arrangement is not limited thereto.

DESCRIPTION OF SYMBOLS 1 Vehicle raising / lowering apparatus 2 Left side raising / lowering apparatus 3 Right side raising / lowering apparatus 11 Support | pillar 12 Elevating part 13 Tire support part 13a Connecting part 13b Mounting part 14 Ratchet mechanism part 21 Motor part 21a Motor 21b Reducer 22 Ball screw part 22a Ball screw 22b Nut 23 LM guide 24 ABSOCODER 31 Swing arm 32 Dog 32a Dog body 32b Rotating shaft 32c Stopper 32d Protrusion 33 Swing rack 34 Fall prevention motor 35 Swing gear 36 Electromagnetic clutch 37 Closing sensor 38 Opening sensor

Claims (1)

A vehicle lifting device that lifts and lowers a lifting unit that supports a vehicle along a pair of columns,
A swing arm that extends along the column and is rotatable about the upper end,
A fall prevention motor for rotating the swing arm;
An electromagnetic clutch for transmitting the driving force generated by the fall prevention motor to the swing arm,
When the elevating part rises, the elevating part rises while pushing up in contact with the dog provided on the swing arm,
When the elevating part descends, the driving force of the fall prevention motor is transmitted to the swing arm via the electromagnetic clutch, and the lower end of the swing arm rotates in a direction away from the elevating part. The dog is in non-contact with the lifting part,
If an abnormality occurs while the elevating unit is descending, the electromagnetic clutch is disconnected, the lower end of the swing arm rotates in a direction approaching the elevating unit, and the dog supports the elevating unit from below. ,
Vehicle lifting device.

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