Lifting device for automobile maintenance

Abstract

A lifting device for automobile maintenance comprises a rack, a lifting table, a lifting mechanism, a locking mechanism and a lifting mechanism, the lifting mechanism is arranged on the rack, the action end of the lifting mechanism is connected with the lifting table, the locking mechanism is arranged on the lifting table, the locking mechanism is matched with a lifting table lock hole in the rack, and the lifting mechanism is arranged on the lifting table. The lifting mechanisms are arranged on the two sides of the lifting table, each lifting mechanism comprises a large lifting arm and an auxiliary arm, the auxiliary arms are telescopically sleeved with the large lifting arms, the large lifting arms are rotationally connected to a pin shaft of the lifting table in a sleeving mode, locking gears are arranged at the connecting positions of the pin shafts of the large lifting arms, and the locking gears are meshed with the locking gears. The locking gear is matched with a locking gear shaft, and the locking gear shaft is connected with a locking control assembly used for driving the locking gear shaft to ascend and descend vertically. The lifting device for automobile maintenance is low in cost, light in weight and good in applicability, and can adapt to small and medium-sized automobiles of different sizes.

Description

Technical Field

[0001] The invention belongs to the field of automobile maintenance, in particular to a lifting device for automobile maintenance. Background Art

[0002] Car lifts are a product that has gradually emerged with the development of the automobile industry. They play an important role in the automobile maintenance industry and are also indispensable maintenance equipment in the automobile maintenance industry. Car lifts are mainly divided into mechanical and hydraulic types according to the transmission method. Each has its own advantages and disadvantages and is suitable for different occasions. Mechanical car lifts have price advantages over hydraulic car lifts and are suitable for small automobile repair shops. The main lifting methods of existing lifts are: wire rope lifting, screw drive lifting and hydraulic cylinder direct lifting; the existing technical defects: it is impossible to take into account both low cost and lightweight, and the applicability is poor. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art that it cannot take into account both low cost and light weight and has poor applicability, the present invention provides a lifting device for automobile maintenance that takes into account both low cost and light weight, has a simple structure and good applicability, and can adapt to small and medium-sized automobiles of different sizes.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A lifting device for automobile maintenance comprises a frame, a lifting platform, a lifting mechanism, a locking mechanism and a lifting mechanism, wherein the lifting mechanism is arranged on the frame, the action end of the lifting mechanism is connected to the lifting platform, the lifting platform is provided with a locking mechanism, the locking mechanism cooperates with the lifting platform lock hole on the frame, the lifting mechanism is arranged on both sides of the lifting platform, the lifting mechanism comprises a lifting arm and a secondary arm, the secondary arm is telescopically sleeved in the lifting arm, the lifting arm is rotatably sleeved on the pin shaft of the lifting platform, a locking gear is arranged at the pin shaft connection of the lifting arm, the locking gear cooperates with the locking gear shaft, and the locking gear shaft is connected to a locking control component used for driving the locking gear shaft to move up and down.

[0006] Furthermore, the lifting mechanism also includes a forearm and a tray, the tray is fixedly mounted on the forearm, and the forearm is fixed on the auxiliary arm.

[0007] Preferably, the upper arm and the auxiliary arm are positioned and fixed by locking screws, and a spring washer is provided at the connection of the locking screws.

[0008] Furthermore, the locking control assembly includes a pull ring and a compression spring. The locking gear shaft can be lifted and lowered between the upper panel and the lower panel of the lifting platform. The upper part of the locking gear shaft passes through the upper panel, and the lower part of the locking gear shaft passes through the lower panel. The upper part of the locking gear shaft is provided with a pull ring for pulling the locking gear shaft to extend upward. The middle part of the locking gear shaft is sleeved with a compression spring, and the compression spring is located between the upper panel and the lower panel.

[0009] Furthermore, the locking mechanism includes a solenoid valve, a reset spring and a safety pin. The safety pin is telescopically arranged on the lifting platform. The safety pin cooperates with the lifting platform lock hole on the frame. The driving end of the solenoid valve is linked to the front of the safety pin, and the end of the safety pin abuts against the reset spring.

[0010] Furthermore, the lifting mechanism includes a motor, a reducer and a ball screw. The output end of the motor is connected to the input end of the reducer through a coupling, and the output end of the reducer is connected to the upper end of the ball screw. The ball screw passes through the lifting platform and matches the ball screw nut of the lifting platform. The lifting platform can be slid up and down on the guide rail of the frame to form a screw linear motion mechanism.

[0011] Preferably, a deep groove ball bearing is provided at the end of the ball screw close to the reducer, and an axial end retaining ring and a flat key are provided at this end; at the bottom end of the ball screw, that is, the end close to the ground, a deep groove ball bearing and a double-row thrust ball bearing are provided, and the double-row thrust ball bearing 13 is fixed by a top nut.

[0012] The technical concept of the present invention is as follows: slide rails are installed at both ends of the inner side of the frame, the lifting platform is fixed on the slide rails through a slider, a ball screw nut is installed in the inner hole of the lifting platform, the motor is connected to the ball screw through a coupling and a reducer, and the lifting platform moves up and down through the ball screw. The lifting mechanism includes two sets of lifting arms, which can be extended and retracted within a certain range. The lifting arm and the lifting platform are connected in an articulated manner. An arc-shaped locking gear is installed at the end of the lifting arm, and a locking gear shaft that cooperates with the arc-shaped locking gear is installed on the lifting platform. The swing angle of the two lifting arms is adjusted by adjusting the relative position of the locking gear and the locking gear shaft to adapt to cars of different lengths; the lifting arm is composed of a lifting arm, a jib, a forearm and a tray, etc. The lifting arm length is adjusted by extending the relative position of the arm and the jib, and then tightening the set screws between the arm and the jib to adapt to cars of different wheelbases. The lifting platform and the frame are equipped with a locking mechanism. When the lifting platform and the lifting arm are raised to the predetermined position, the solenoid valve loses power and the reset spring pops out the safety pin. The safety pin is inserted into the lock hole of the lifting platform of the frame under the action of the spring force, ensuring that the lifting platform will not fall and cause a safety accident when the workers are repairing the vehicle.

[0013] The car lift of the present invention is a double-column mechanical car lift. The car lift uses a motor as a prime mover. The motor is connected to a ball screw through a reducer, thereby reducing the speed of the motor and increasing the torque of the motor to meet the speed and torque requirements of the screw rotation.

[0014] The beneficial effects of the present invention are mainly manifested in: low cost and light weight, good applicability, simple structure and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a lifting device for automobile maintenance.

[0016] Figure 2 The present invention is a schematic diagram of the working state of a lifting device for automobile maintenance, wherein (a) is a top view of the lifting mechanism, (b) is a schematic diagram of the rotation range of the main arm of the lifting arm and the telescopic range of the auxiliary arm, and the rotation and telescopic range of the main arm and the auxiliary arm are controlled to adapt to different types of automobiles. (c) is a schematic diagram of the telescopic range of the lifting platform.

[0017] Figure 3 It is a schematic diagram of the system transmission.

[0018] Figure 4 Schematic diagram of the lead screw, where (a) is an appearance diagram and (b) is a CC cross-sectional diagram of (a).

[0019] Figure 5 It is a schematic diagram of the connection between the lifting platform and the lifting mechanism, where (a) is a left view and (b) is an axonometric view.

[0020] Figure 6 It is a schematic diagram of the locking mechanism of the lifting platform.

[0021] Figure 7 is a schematic diagram of a rack, wherein (a) is an appearance diagram, and (b) is an AA cross-sectional diagram of (a).

[0022] Figure 8 Schematic diagram of a lifting mechanism, wherein (a) is a top view and (b) is an AA cross-sectional view of (a).

[0023] Fig. 9 Schematic diagram of the locking gear shaft, wherein (a) is the front view and (b) is the side view.

[0024] Fig.10 This is a schematic diagram of the safety latch.

[0025] Fig.11It is a schematic diagram of the locking of the lifting platform. Among them, (a) is a schematic diagram showing that the lifting platform is about to reach the predetermined position, the solenoid valve is energized and the reset spring is compressed, and the lifting safety lock has not yet worked; (b) is a schematic diagram showing that the lifting platform reaches the predetermined position, the solenoid valve is de-energized and energized, the reset spring pops out the safety pin, and the safety lock is inserted into the limit hole of the frame; (c) is a schematic diagram showing that the lifting platform continues to rise without reaching the predetermined position.

[0026] The accompanying drawings are marked as: 1-motor, 2-motor seat, 3-frame, 4-lifting platform, 5-lifting mechanism, 5-1 lifting arm, 5-2 reinforcement rib, 5-3 auxiliary arm, 5-4 small arm, 5-5 pallet, 6-coupling, 7-reducer, 8-deep groove ball bearing, 9-ball screw, 10-lifting platform, 11-shaft end retaining ring, 12-flat key, 13-double row thrust ball bearing, 14-top nut, 15-ball screw nut, 16-slider, 17-locking gear, 18-pin shaft, 19-pull ring, 20-compression spring, 21-locking gear shaft, 22-solenoid valve, 23-safety latch, 24-reset spring, 25-lifting platform lock hole, 26-guide rail, 27-gasket, 28-1-first screw, 28-2-second screw, 29-spring gasket, 30-setting screw. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Reference Figures 1 to 11 , a lifting device for automobile maintenance, comprising a frame 3, a lifting platform 4, a lifting mechanism, a locking mechanism 5 and a lifting mechanism, the frame 2 is provided with a lifting mechanism, the action end of the lifting mechanism is connected to the lifting platform 4, the lifting platform 4 is provided with a locking mechanism, the locking mechanism cooperates with the lifting platform lock hole 25 on the frame 3, the lifting mechanism 5 is arranged on both sides of the lifting platform 4, the lifting mechanism 5 comprises a lifting arm 5-1 and a secondary arm 5-3, the secondary arm 5-3 is telescopically sleeved in the lifting arm 5-1, the lifting arm 5-1 is rotatably sleeved on the pin shaft of the lifting platform 4, a locking gear 17 is arranged at the pin shaft connection of the lifting arm, the locking gear 17 cooperates with the locking gear shaft 21, and the locking gear shaft 21 is connected to a locking control component for driving the locking gear shaft to move up and down.

[0029] Reference Figure 3 The output end of the motor 9 is connected to the input end of the reducer 7 through the coupling 6, and the output end of the reducer 7 is connected to the upper end of the ball screw 9. A deep groove ball bearing 8 is arranged on the upper part of the ball screw 9. The ball screw 9 passes through the lifting platform 4 and matches with the ball screw nut 15 of the lifting platform 4. The lifting platform 4 can be slidably mounted on the guide rail 26 of the frame 3 up and down to form a screw linear motion mechanism.

[0030] When the motor 9 starts working, the motor speed is reduced and the torque is increased by the deceleration effect of the reducer 7. The reducer 7 transmits the amplified torque and the reduced speed to the ball screw 9 through the coupling 6. The rotation of the ball screw 9 is converted into the linear motion of the ball screw nut 15 in the vertical direction, so that the ball screw nut 15 drives the lifting platform 4 to move vertically and realize the lifting action of the car.

[0031] Reference Figure 4 A deep groove ball bearing 8 is arranged at the end of the ball screw 9 close to the reducer 7, and an axial end retaining ring 11 and a flat key 8 are arranged at this end; at its bottom end, that is, the end close to the ground, a deep groove ball bearing and a double-row thrust ball bearing 13 are arranged to offset the axial force of the screw shaft, and the double-row thrust ball bearing 13 is fixed by a top nut 14.

[0032] Reference Figure 5 , Figure 6 and Figure 8 The lifting arm 5-1 is rotatably sleeved on the pin 18 of the lifting platform 4. The connection between the lifting arm 5-1 and the pin 18 is provided with a locking gear 17 through a first screw 28-1. The locking gear 17 cooperates with the locking gear shaft 21. The locking gear shaft 21 is as shown in Fig. 9 As shown, the locking gear shaft 21 can be lifted and lowered between the upper panel and the lower panel of the lifting platform 4, the upper part of the locking gear shaft 21 passes through the upper panel, and the lower part of the locking gear shaft 21 passes through the lower panel, and the locking control assembly includes a pull ring 19 and a compression spring 20, the upper part of the locking gear shaft 21 is provided with a pull ring 19 for pulling the locking gear shaft 21 to extend upward, the middle part of the locking gear shaft 21 is sleeved with the compression spring 20, and the compression spring 20 is located between the upper panel and the lower panel; when the pull ring 19 is pulled upward and the locking gear 17 is separated from the locking gear shaft 21, the angle between the lifting arms can be changed by rotating the lifting main arm 1; when the angle is adjusted to the right position, the pull ring 19 is released, and under the resetting action of the compression spring 20, the locking gear 17 and the locking gear shaft 21 are locked and positioned.

[0033] Reference Figure 8 When in use, loosen the locking screw 30 between the lifting arm 5-1 and the auxiliary arm 5-3, and set the spring washer 29 at the connection of the locking screw; the tray 5-5 is fixedly installed on the small arm 5-4, and the small arm 5-4 is fixed on the auxiliary arm 5-3 by the second screw 28-2. By operating the tray 5-5, the small arm 5-4 and the auxiliary arm 5-3 and the lifting arm 5-1 are driven to slide relative to each other, thereby changing the length of the lifting arm 5. The lifting arm 5-1 is provided with a reinforcing rib 5-2 to improve the strength.

[0034] Reference Figure 7The frame 3 is provided with a guide rail 26 to guide the lifting platform 4 to move up and down. The frame 3 and the lifting platform lock hole 25 are welded together by welding. The lifting platform safety lock hole 25 can be provided with at least two vertical rows, and each row is provided with multiple equally spaced from top to bottom, and will cooperate with the safety latch 23 on the lifting platform to achieve the locking of the lifting platform. The motor base 2 is installed on the frame 3, and a gasket 27 is provided between the motor base 2 and the frame 3.

[0035] Reference Fig.10 and Fig.11 When the lifting platform 4 rises, the safety latch 23 rises with the lifting platform 4. Fig.11 As shown in (a); Fig.11 (b) indicates that the lifting platform reaches the predetermined position, the electromagnetic valve 22 loses power and is attracted, and the reset spring 24 pops out the safety latch 23, and the safety latch 23 is inserted into the lifting platform lock hole 25 to lock and position; if it has not reached the predetermined position, such as Fig.11 As shown in (c), the lifting platform 4 continues to rise and the solenoid valve 22 continues to remain energized.

[0036] The working process of this embodiment is as follows: Figure 5 and Figure 6 When the car is lifted, the ball screw nut 15 converts the rotational motion of the screw into linear motion, thereby driving the lifting and lowering motion of the lifting platform 4. The slider 4 of the lifting platform 4 cooperates with the guide rail 26 to play a guiding role when the lifting platform rises. Under the action of the reset spring 24, the safety pin 23 can be extended and retracted on the lifting platform along the shape of the lifting platform lock hole 25. When the lifting platform 4 rises, the safety pin 23 rises with the lifting platform 4, the electromagnet is energized, and the safety pin 23 does not extend outward, so that the lifting platform 4 can rise normally without being blocked by the safety pin 23. When the lifting platform 4 rises to the position required by the maintenance personnel, the electromagnet loses power, and the safety pin 23 extends outward under the action of the reset spring 24 and is stuck in the corresponding position of the lifting platform lock hole 25, thereby locking the lifting platform to place it down. When the maintenance is completed, the maintenance personnel presses the power switch of the electromagnet, so that the electromagnet is energized to push the safety pin 23 back, so that the lifting platform 4 can descend smoothly.

[0037] When the maintenance personnel places the lifting arm 5 at the lifting point of the vehicle, they can lift the pull ring 19 to separate the locking gear shaft 21 from the locking gear 17, so that the lifting arm 5 can rotate around the pin 8 within a range of 110°. After the maintenance personnel releases the pull ring 19, the compression spring 20 can make the locking gear shaft 21 mesh with the locking gear 17, thereby locking the lifting arm 5.

[0038] In order to verify the reliability of the design, the present invention uses the Simulation tool of Solidworks software to perform finite element analysis. The key parts of the designed car maintenance lift are subjected to finite element simulation, and the static stress analysis is selected using the Simulation plug-in of Solidworks software, and alloy steel is selected as the material. The assembly is used to solve the lifting platform, so it is necessary to select a connection method. Here, the connection method selects the joint method as the non-joint type, and the friction coefficient is set to 0.05. After the connection method is set, it is necessary to select the clamping method as fixed and place it on the inner hole of the screw shaft nut. Apply an external load, and the external load selects force. According to the weight of a family car between 1.5-2 tons, the force on a single wheel hub is set to only one-fourth of the rated load, which is 4900N. Then apply a grid. Since the grid in Simulation only provides a tetrahedral structure, the grid shape selects a tetrahedral structure, and the grid size is set to 20mm. After the material, constraint, external load and grid are set. The results show that the maximum stress occurs at the bolt connection, which is 6.26×10 8 Pa, the maximum node displacement is 8.155×10 -2 mm.

[0039] The finite element analysis of the safety lock of the lifting platform was carried out, and the load size was set to 4900N, which is one-fourth of the maximum weight of the car. The mesh was divided into tetrahedral meshes, and the mesh control was used to make the mesh size of the contact area between the safety lock of the lifting platform and the lock hole on the frame 1mm, and the rest of the area was set to 4mm. The results show that the maximum stress occurred at the contact between the lock and the lock hole, which was 5.6×10 8 Pa, the maximum node displacement is 1.885×10 -2 mm.

[0040] Finite element analysis is performed when the lifting arm is stretched to the maximum (with the greatest force). The specific operation is the same as above; external load is applied, and the external load is selected as force, and the force is 4900N. Then the grid is applied. Since the grid in Simulation only provides a tetrahedron structure, the grid shape is selected as a tetrahedron structure, and the grid size is set to 25mm. After the material, constraints, external loads and grid settings are completed, the specific simulation results are obtained. The results show that the maximum stress occurs at the connection between the upper arm and the middle arm of the lifting arm, which is 1.666×10 8 Pa, the maximum node displacement is 2.419 mm.

[0041] The contents described in the embodiments of this specification are merely enumerations of implementation forms of the inventive concept and are for illustrative purposes only. The protection scope of the present invention should not be considered to be limited to the specific forms described in this embodiment, and the protection scope of the present invention also extends to equivalent technical means that can be thought of by ordinary technicians in this field based on the inventive concept.

Claims

1. A lifting device for automobile maintenance, characterized in that: The device includes a frame, a lifting platform, a lifting mechanism, a locking mechanism and a lifting mechanism. The lifting mechanism is arranged on the frame, and the action end of the lifting mechanism is connected to the lifting platform. The lifting platform is provided with a locking mechanism, and the locking mechanism cooperates with the lifting platform lock hole on the frame. The lifting mechanism is arranged on both sides of the lifting platform. The lifting mechanism includes a lifting arm and a jib. The jib can be telescopically mounted in the lifting arm, and the lifting arm can be rotatably sleeved on the pin shaft of the lifting platform. A locking gear is arranged at the pin shaft connection of the lifting arm, and the locking gear cooperates with a locking gear shaft, and the locking gear shaft is connected to a locking control component used to drive the locking gear shaft to move up and down.

2. A lifting device for automobile maintenance as claimed in claim 1, characterized in that: The lifting mechanism also includes a small arm and a tray. The tray is fixedly mounted on the small arm, and the small arm is fixed on the auxiliary arm.

3. A lifting device for automobile maintenance as claimed in claim 1 or 2, characterized in that: The main arm and the auxiliary arm are positioned and fixed by locking screws, and spring washers are arranged at the connection of the locking screws.

4. A lifting device for automobile maintenance as claimed in claim 1 or 2, characterized in that: The locking control assembly includes a pull ring and a compression spring. The locking gear shaft can be lifted and lowered between the upper panel and the lower panel of the lifting platform. The upper part of the locking gear shaft passes through the upper panel, and the lower part of the locking gear shaft passes through the lower panel. The upper part of the locking gear shaft is provided with a pull ring for pulling the locking gear shaft to extend upward. The middle part of the locking gear shaft is sleeved with a compression spring, and the compression spring is located between the upper panel and the lower panel.

5. A lifting device for automobile maintenance as claimed in claim 1 or 2, characterized in that: The locking mechanism includes a solenoid valve, a reset spring and a safety pin. The safety pin is telescopically arranged on the lifting platform. The safety pin cooperates with the lifting platform lock hole on the frame. The driving end of the solenoid valve is linked to the front of the safety pin, and the end of the safety pin abuts against the reset spring.

6. A lifting device for automobile maintenance as claimed in claim 1 or 2, characterized in that: The lifting mechanism includes a motor, a reducer and a ball screw. The output end of the motor is connected to the input end of the reducer through a coupling, and the output end of the reducer is connected to the upper end of the ball screw. The ball screw passes through the lifting platform and matches the ball screw nut of the lifting platform. The lifting platform can be slidably mounted on the guide rail of the frame to form a screw linear motion mechanism.

7. A lifting device for automobile maintenance as claimed in claim 1 or 2, characterized in that: A deep groove ball bearing is arranged at the end of the ball screw close to the reducer, and a shaft end retaining ring and a flat key are arranged at this end; a deep groove ball bearing and a double-row thrust ball bearing are arranged at the bottom end of the ball screw, that is, the end close to the ground, and the double-row thrust ball bearing is fixed by a top nut.

Images