KR101666421B1 - Lift table for maintaining and repairing a vehicle which allows greater precision of control - Google Patents

Abstract

Disclosed is a lift for vehicle maintenance with a precise elevation control function, capable of improving the convenience and safety of work, simplifying the structure, and enhancing the efficiency of space by employing a solenoid valve designed to improve a connection structure of a safety device and precisely control the same. An elevating device (60) of the lift for vehicle maintenance is placed between a floor frame (50) and an upper plate (90) to elevate and safely support the upper plate. A link device (70) of the elevating device is integrated through a hinge shaft to enable vertical hinge movement. A screw type safety device (80) of the elevating device embeds a solenoid valve (86) designed to control the flux of a cylinder (84).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a lift table for a vehicle,

The present invention relates to a vehicle stability lift, and more particularly, to a solenoid valve designed to improve the connection structure of a safety device and precisely control the safety structure, thereby improving the convenience and safety of the operation, The lift of the vehicle is increased.

Generally, a vehicle lift is a device designed to easily work on the lower part of a vehicle by keeping the vehicle body lifted when the vehicle is being serviced. It can be divided into two stocks, four stocks, X-type And so on.

These safety lifts are equipped with several safety devices to ensure the safety of workers. Major safety devices include wire safety devices, overload protection devices, safety lock assemblies, and up limit switches.

First, the wire safety device prevents the lift table from dropping by mechanically engaging the roller with the rail when the wire is broken. In the overload preventing device, when the lifting is over the rated capacity, the relief valve installed in the hydraulic device operates to exceed the rated load And the safety lock assembly consists of a safety lock rail, a safety locker and an anchorage style, with a safety lock rail and a safety locker mounted on the column to prevent the lift table from falling, To prevent the arm from rotating or being disengaged. The upward limit switch performs a function of preventing the vehicle from being excessively raised in a state in which the operator is not aware of it.

FIG. 6 is a partial enlarged view of an X-type vehicle steady-state cost lift according to the prior art.

Referring to FIG. 6, in the conventional vehicle lift control system, an X-shaped folding frame 12 is disposed between a floor frame 11 and a foot plate 13, And a gear type safety device corresponding to the safety lock assembly is mounted on each arm.

The hydraulic cylinder 20 and the auxiliary hydraulic cylinder 24 are arranged to extend obliquely upward from the base of one arm and at the periphery of the hydraulic cylinder 20, The fixing piece 21 formed so as to expose the tooth profile is disposed to extend in the longitudinal direction of the hydraulic cylinder 20. [ The engaging piece 23 having one end fixed to the middle of the other arm extends toward the hydraulic cylinder 20 and is engaged with the gear teeth of the fixing piece 21 through a gear tooth formed so as to be exposed at the lower surface front end thereof. .

In a conventional vehicle height-keeping lift having such a structure, the gear teeth formed to be exposed on the upper surface of the fixing piece 21 at the time of ascending / descending for maintenance of the vehicle and the gear teeth formed to be exposed at the front- Up and down operation is performed by engagement between gear teeth.

However, in the conventional gear type safety device, since the lifting and lowering operation of the support plate due to the engagement of the gear teeth is relatively smooth, it is possible to cause the vehicle to rock when the support plate is lifted or lowered, The screws (bolts, nuts, etc.) of the lift may be loosened and the vehicle loaded on the lift table may be tilted in a dangerous situation.

In addition, a hydraulic cylinder mainly used in a conventional gear type safety device is usually constituted by a pair of a main hydraulic cylinder and an auxiliary cylinder, which connects the flow rate of the double acting cylinder to the other single acting cylinder so that both cylinders move together There is a problem in that the cylinders have to be inserted one by one in the space of the folded frame, that is, the link mechanism, so that space is limited and a double-acting cylinder is used.

Korean Utility Model Registration No. 20-0277286 (Registration date: May 22, 2002) Korean Registered Patent No. 10-0597370 (Registered Date: June 29, 2006) Korean Patent Laid-Open No. 10-2012-0038953 (public date: April 24, 2012)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to solve the problems of the related art by providing a safety device and a safety device in which the connection structure and the operation mechanism can be precisely controlled, It is intended to provide a vehicle lift that improves convenience, simplifies construction and improves space efficiency.

In order to solve the technical problems of the present invention as described above, the present invention provides a vehicle comprising: a bottom frame; an upper plate; a vehicle body including a lift device disposed between the bottom frame and the upper plate to lift and lower the upper plate, In the cost lift, the lift device includes a link mechanism arranged to interlock with each other between the floor frame and the upper plate; And a screw type safety device designed to be capable of controlling the flow rate of the cylinder and the cylinder, and incorporating a solenoid valve corresponding to the cylinder, and for providing and controlling the vertical bending motion of the link mechanism Provide a lift to the vehicle.

According to a first preferred embodiment of the present invention, the link mechanism is provided with a pair of arms arranged so as to cross in an X-shape between the floor frame and the upper plate, and the arms are interlocked Respectively.

Alternatively, according to a second preferred embodiment of the present invention, the link mechanism includes a plurality of arms disposed between the bottom frame and the upper plate and joined together in a jointed manner by a hinge shaft, Wherein a lower end of the first arm is fixed to the bottom frame and an upper end of the first arm is fastened to a lower end of the second arm of the plurality of arms through the hinge axis, do.

The discharge pipe of the solenoid valves communicates with an oil pressure transfer pipe extending to an oil pressure outlet through an oil pressure inlet of the cylinder, and the flow rate is controlled by setting different diameters to discharge pipes of the respective solenoid valves.

When the diameter of the first solenoid valve to the discharge pipe is set to? 1, the diameter of the second solenoid valve to the discharge pipe is? 2, which is twice the diameter of the discharge pipe of the first solenoid valve, , The diameter of the third solenoid valve to the discharge pipe is set to? 4 which is twice the diameter of the discharge pipe of the second solenoid valve, and the diameter of the fourth solenoid valve to the discharge pipe is set to the discharge pipe of the third solenoid valve 8 " , which is twice the diameter of the "?& Quot ;

According to the present invention, unlike a conventional vehicle-type safety lift that employs a gear type safety device, a screw type safety device that is driven in accordance with a solenoid valve control mechanism designed to control a flow rate is adopted, The upper and lower directional folding motions of the link mechanism arranged to interlock with each other can be controlled more precisely, whereby the rising and falling of the upper plate can be stably performed, thereby preventing the vehicle from shaking and vibrating. In addition, since the link mechanism can be modified and changed not in the X-shape but in other forms so that the operator can carry the vehicle between the link mechanisms when the vertical lift of the vehicle vertical load is developed, An improvement effect can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a vehicle steady cost lift according to a first preferred embodiment of the present invention, in which the lift is maximally expanded in a vertical direction;
Fig. 2 is a schematic view of a vehicle steady-state lift according to a first preferred embodiment of the present invention, showing a state in which the lift is vertically folded to the maximum extent;
3 is an enlarged partial cross-sectional view of a portion of the vehicle lift shown in FIG. 1;
4 is a diagrammatic view of a solenoid valve control mechanism of a screw-type safety device for providing and controlling up-and-down movement of a vehicle steady-state lift according to the present invention;
5 is a view schematically showing the structure of a vehicle steady-state lift according to a second preferred embodiment of the present invention; And
6 is a partially enlarged view of a lifting / lowering locking device of a vehicle lifting gear according to the prior art.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0028] Hereinafter, a vehicle stabilization lift according to preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 and FIG. 2 show a vehicle fixed cost lift according to a first preferred embodiment of the present invention, but a power supply device, a hydraulic pump, a speed reducer, a motor, and the like are omitted for convenience of explanation.

Referring to FIGS. 1 and 2, a vehicle fixed-rate lift 100 according to a first preferred embodiment of the present invention includes a floor frame 50 placed on a ground G of a vehicle repair shop or a maintenance shop, And an elevating device 60 disposed between the floor frame 50 and the upper plate 90 for raising, lowering and securely supporting the upper plate 90.

The elevating device 60 includes a link mechanism 70 disposed in pairs in an X shape between the floor frame 50 and the upper plate 80 and a link mechanism 70 extending between the link mechanisms 70, And a screw-type safety device 80 for providing and controlling the upward and downward folding motions of the motor 70.

The link mechanism 70 has a pair of arms 71 and 72 arranged to intersect in an X-shape, and these arms 71 and 72 are integrally formed by a hinge shaft 73 at a point intersecting in an X- And the lower ends thereof are supported on the bottom frame 50. At this time, the first guide pins 52 disposed across the guide grooves 51 formed on both sides of the bottom frame 50, respectively, And guided along the first guide groove 51 to be slidable in the front-rear direction. Similarly, the upper ends of the arms 71 and 72 are supported on the lower surface of the upper plate 90. At this time, the second guide grooves 91, which are respectively formed on both side surfaces of the upper plate 90, And guided along the second guide groove 91 by the guide groove 92 so as to be slidable in the front-rear direction.

Fig. 3 is a partially enlarged view of the vehicle steady cost lift shown in Fig. 1, showing the construction of the screw type safety device 80. Fig.

3, the screw-type safety device 80 is composed of a linear actuator disposed between a pair of arms 71 and 72 of the link mechanism 70, respectively. The screw-type safety device 80, that is, the linear actuator has its upper end fixed to the intermediate portion of the second arm 72 and the intermediate portion between the first arm 71 and the lower end of the linear actuator, A ball screw shaft 82 mechanically connected to a motor (not shown) and a motor (not shown), a ball screw shaft 82 disposed within the cylinder 84 and screwed onto the radially outer surface of the ball screw shaft 82, And a ball nut 83 which moves along the axis of the ball nut 83.

When the ball screw shaft 82 mechanically connected to the motor (not shown) through the speed reducer (not shown) is rotated by the motor, the ball nut 83 is rotated The linear motion of the ball screw shaft 82 along the ball screw shaft 82 is converted into a linear motion. As a result, the link mechanism 70 is moved up and down in the vertical direction . At this time, the ball nut 83 is continuously moved along the ball screw shaft 82 in the longitudinal direction of the ball screw shaft 82, so that the vertical movement of the link mechanism 70 can be precisely controlled.

As described above, as described above, in the conventional vehicle lift system, in order to provide and control the vertical movement of the link mechanism composed of the X-shaped arms, the double acting cylinder and the single acting cylinder are usually arranged in the arm of the link mechanism However, since the double acting cylinder is relatively thicker than the single acting cylinder, the width of the link mechanism arm must be secured to some extent. This poses a problem that installation of the link mechanism is restricted by space.

In order to solve these problems, according to the present invention, cylinders (84) each having a small thickness are mounted at four positions provided between a pair of arms (71, 72) of a link mechanism (70) The solenoid valves are combined to control the hydraulic pressure of the cylinder precisely.

4 schematically shows the solenoid valve 86 control mechanism of the screw-type safety device 80. As shown in Fig.

4, each of the solenoid valves 86a (86a, 86b) communicating with the common discharge path 88 in the hydraulic transfer conduit extending through the respective solenoid valves 86a-86b through the hydraulic inlet, The diameter of the discharge pipes 85a to 85d of the discharge passages 86a to 86b is set to be four different sizes to control the flow rate.

For example, when the diameter of the discharge path 85a of the first solenoid valve 86a is set to? 1, the diameter of the discharge path 85b of the second solenoid valve 86b is set to? 2, The diameter of the discharge path 85c of the third solenoid valve 86b is set to Φ4 which is twice the diameter of the discharge path 85b of the second solenoid valve 86b and the discharge path 85d of the fourth solenoid valve 86d, The diameter of the second solenoid valve 86b is set to? 8 which is double the diameter of the discharge pipe 85c of the third solenoid valve 86b so that each valve can be operated corresponding to the required flow rate . With this combination, a total of 15 flow rates can be controlled using four solenoid valves.

According to the present invention there is provided a link mechanism 70 which is disposed between a floor frame 50 and an upper plate 80 by a screw-type safety device 80 including a solenoid valve 86 having the structure and function as described above ) Can be variously modified and changed.

 Fig. 5 schematically shows the structure of a vehicle lift according to a second preferred embodiment of the present invention.

As shown in Fig. 5, unlike the link mechanism 70 according to the first preferred embodiment of the present invention, when the link mechanism 70 is deployed in the vertical direction instead of the X- So that the worker can carry it between them.

The link mechanism 70A according to the second preferred embodiment of the present invention includes a plurality of arms 74a and 74b which are joined together by a hinge shaft 75 in a jointed manner. The lower end of the third arm 74a is fixed to the bottom frame 50A and the upper end thereof is fastened to the lower end of the fourth arm 74b through the hinge shaft 75. [ At this time, unlike the structure of the bottom frame 50 according to the first preferred embodiment of the present invention, the bottom frame 50A is not a unitary structure integrally connected thereto, but is arranged so as to be able to be carried by an operator therebetween. The upper ends of the fourth arms 74b are guided along the guide grooves by a guide pin (not shown) disposed across the guide grooves (not shown) formed on both side surfaces of the upper plate 90 as in the first embodiment So as to be guided.

A screw type safety device 80 is disposed between the intermediate portion of the third arm 74a and the middle portion of the fourth arm 74b and between the intermediate portion of the fourth arm 74b and the lower surface of the upper plate 90 . The screw type safety device 80 including the solenoid valve 86 as described above can foldably move the arms 74a and 74b and the upper plate 90 in the vertical direction in the form of a joint. The operator can freely move under the upper plate 90 in a state in which the lift of the vehicle steady state according to the second preferred embodiment of the present invention is raised, thereby greatly improving the convenience of the operation.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims. It can be understood that it is possible.

50, 50A: bottom frame 51, 91: guide groove
52, 92: guide pin 60: elevating device
70, 70A: Link mechanism 71, 72, 74a, 74b:
73,75: Hinge shaft 80: Screw-type safety device
82: Ball screw shaft 83: Ball nut
84: cylinder 85a, 85b, 85c, 85d:
86, 86a, 86b, 86c, 86d: solenoid valve
88: Joint outlet pipe G: Ground
100: lift for car maintenance

Claims (7)

And a lift device disposed between the floor frame and the upper plate for lifting up and down and securely supporting the upper plate,
The lift device,
A link mechanism arranged to interlock with each other between the floor frame and the upper plate; And
A screw type safety device designed to be capable of controlling the flow rate of the cylinder and the cylinder, and incorporating a solenoid valve corresponding to the cylinder, for providing and controlling the vertical bending motion of the link mechanism;
Lt; / RTI >
The link mechanism includes:
A plurality of arms disposed between the bottom frame and the top plate and joined together in a jointed manner by a hinge shaft, the bottom ends of the first arms being fixed to the bottom frame, The upper ends of the second arms are fastened to the lower ends of the second arms of the plurality of arms through the hinge shafts and the bottom frames are spaced apart from each other, And is supported so as to be slidable in the front-rear direction along the guide groove by a guide pin disposed across the groove,
Characterized in that the screw type safety device is disposed between the intermediate portion of the first arm and the intermediate portion of the second arm and between the intermediate portion of the second arm and the lower surface of the upper plate, lift.
The method according to claim 1,
The link mechanism includes:
And a pair of arms arranged to cross each other in an X-shape between the bottom frame and the top plate, wherein the arms are fastened together by a hinge shaft so as to cooperate in a folding motion manner, The upper ends of the arms are supported by the first guide pins arranged on both sides of the upper plate so as to be slidable in the forward and backward directions while being guided along the first guide grooves by the first guide pins arranged across the guide grooves formed on both side surfaces, Is guided along the second guide groove by a second guide pin disposed across the second guide groove and is slidably movable in the forward and backward directions.
delete delete The method according to claim 1,
Wherein the screw type safety device comprises a linear actuator disposed between the arms of the link mechanism or between the arms and the upper plate, wherein the linear actuator has an upper end fixed to an intermediate portion of the arm or a lower surface of the upper plate, A ball screw shaft mechanically connected to the reducer and the motor across the inside of the cylinder of the linear actuator and a ball nut screwed on the radial outer surface of the ball screw shaft and disposed in the cylinder and moving along the ball screw shaft Wherein the lifting device comprises:
6. The method of claim 5,
Wherein the solenoid valves are communicated with a discharge pipe of the solenoid valves through a hydraulic inlet of the cylinder and extend to an oil pressure outlet of the cylinder, Cost lift.
The method according to claim 6,
When the diameter of the first solenoid valve to the discharge pipe is set to? 1, the diameter of the second solenoid valve to the discharge pipe is? 2, which is twice the diameter of the discharge pipe of the first solenoid valve, , The diameter of the third solenoid valve to the discharge pipe is set to? 4 which is twice the diameter of the discharge pipe of the second solenoid valve, and the diameter of the fourth solenoid valve to the discharge pipe is set to the discharge pipe of the third solenoid valve To " 8 " , which is twice the diameter of the valve, so that each valve is operated corresponding to the required flow rate .

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