An electric car lift

Abstract

The present invention discloses an electric vehicle lift, comprising a cylinder body, a cylinder sleeve, a bottom cover, and a lifting assembly. The lifting assembly comprises a piston rod, the piston rod being coaxially and slidably disposed in the cylinder body, the cylinder sleeve being coaxially slidably sleeved on the piston rod, the cylinder sleeve being coaxially fixed to the top end of the cylinder body, and the bottom cover being sealed and fixed to the bottom end of the cylinder body. The electric vehicle lift also comprises a drive motor, a lead screw, and a nut, the lead screw being coaxially disposed in a central hole of the piston rod, the nut being coaxially fixed to the bottom end of the central hole of the piston rod; the lead screw being threadedly connected to the nut, the bottom end of the lead screw extending out of the piston rod; the drive motor being mounted at the bottom of the cylinder body, the drive motor being transmission-connected to the bottom end of the lead screw; and the piston rod being key-connected to the cylinder sleeve. The electric vehicle lift of the present invention can solve the problems of huge investment and long construction period when converting a pneumatic vehicle lift into an electric vehicle lift.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle lifting machines, in particular to an electric vehicle lifting machine. Background Art

[0002] A car lift is a type of maintenance machine developed in recent decades for railway freight train depots. It can lift freight trains to facilitate maintenance. They are categorized by power source as either pneumatic or electric.

[0003] The patent application filed by the applicant in 2021, with the utility model number CN216336335U, discloses a pneumatic vehicle lift with optimized exhaust holes. The device comprises a cylinder with an air inlet at its bottom end and a first cavity within it. A piston disc slides within the cylinder, located above the air inlet and dividing the first cavity into two parts. A piston rod, with a second cavity within it, is mounted on the piston disc and moves synchronously with it. The device comprises a plurality of first exhaust holes, one located at the bottom of the piston rod and connecting the first and second cavities. A second exhaust hole is located at the top of the piston rod and connects the second cavity to the external environment. Pneumatic vehicle lifts are widely used in railway vehicle sections due to their simple structure, minimal maintenance, low pollution, low cost, and high production efficiency. While these advantages are noted, pneumatic vehicle lifts also have drawbacks. For example, unbalanced lifting and jamming during lifting and lowering are common, posing safety risks.

[0004] The main advantage of electric cranes is that they offer smooth lifting and lowering, minimizing potential safety hazards. However, electric cranes are typically installed in a buried manner, but their main disadvantage is the complex foundation and the three-meter-deep foundation pit. In particular, replacing the pneumatic crane in the aforementioned patent with an electric crane would require the entire maintenance warehouse to be completely excavated, which would not only be a huge investment but also a long construction period.

[0005] Therefore, it is necessary to develop an electric vehicle lifting machine for the above-mentioned defects. Summary of the Invention

[0006] The purpose of the present invention is to provide an electric vehicle lift which can solve the defects of huge investment and long construction period when a pneumatic vehicle lift is converted into an electric vehicle lift.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The present invention provides an electric vehicle lifting machine, including a cylinder body, a cylinder sleeve, a bottom cover and a jacking assembly, the jacking assembly including a piston rod, the piston rod is coaxially and slidably arranged in the cylinder body, the cylinder sleeve is coaxially slidably sleeved on the piston rod, the cylinder sleeve is coaxially fixed to the top end of the cylinder body, and the bottom cover is sealed and fixed to the bottom end of the cylinder body, and also includes a drive motor, a screw and a nut, the screw is coaxially arranged in the middle hole of the piston rod, and the nut is coaxially fixedly connected to the bottom end of the middle hole of the piston rod; the screw is threadedly connected to the nut, and the bottom end of the screw extends out of the piston rod, the drive motor is installed at the bottom of the cylinder body, and the drive motor is transmission-connected to the bottom end of the screw; the piston rod is keyed to the cylinder sleeve.

[0009] Furthermore, it also includes a support bearing, which is coaxially fixedly installed on the top end of the screw, and the outer ring of the support bearing is slidably matched with the inner wall of the piston rod.

[0010] Furthermore, a motor plate is fixed to the bottom of the inner cavity of the cylinder, the drive motor is vertically installed on the top surface of the motor plate, the output shaft of the drive motor passes downward through the motor plate and is installed with a driving gear, the lead screw rotatably passes through the motor plate and is installed with a driven gear, and the driving gear is engaged with the driven gear.

[0011] Furthermore, an internal thread is provided at the bottom of the cylinder inner cavity, and an external thread is provided on the outer wall of the motor plate, and the motor plate is threadedly connected to the bottom of the cylinder inner cavity; a groove is provided on the side of the motor plate, and a top screw is threadedly connected on the outer wall of the cylinder body, and the inner end of the top screw is stuck in the groove.

[0012] Furthermore, it also includes a first bearing and a second bearing, the first bearing and the second bearing are installed on the top surface of the bottom cover, the end of the output shaft of the drive motor is interference fit with the inner ring of the first bearing, the step of the bottom end of the screw is interference fit with the inner ring of the second bearing, and the stepped end face of the bottom end of the screw is supported by the end face of the inner ring of the second bearing.

[0013] Furthermore, it includes two proximity switches and an L-plate, the first proximity switch is installed on the bottom surface of the cylinder sleeve, the second proximity switch is installed on the top surface of the motor plate, and the two proximity switches are located in the same vertical direction, the L-plate is fixed to the bottom of the piston rod, and the L-plate is located between the two proximity switches in the vertical direction.

[0014] Furthermore, it also includes a sealing plate and a pressure ring. The sealing plate is coaxially provided between the cylinder sleeve and the piston rod. The pressure ring presses the sealing plate, and the pressure ring is fixedly connected to the cylinder sleeve.

[0015] Furthermore, a key groove is provided on the outer wall of the piston rod, and the key groove is arranged along the length direction of the piston rod. A flat key matching the key groove is provided on the inner wall of the cylinder sleeve, and the key groove and the flat key are slidably matched.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] The present invention provides an electric car lift. The original pneumatic car lift is taken out of the foundation pit, and the cylinder body of the original pneumatic car lift can be modified to form the cylinder body of the present application, and other components are assembled. There is no need to re-excavate the foundation pit, the investment is small, the construction period is short, and the original pneumatic car lift can be converted into an electric car lift by driving the piston rod through the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 Schematic diagram of the three-dimensional structure of the electric vehicle lifting machine of the present invention;

[0020] Figure 2 It is a schematic cross-sectional view of the present invention;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the bottom cover of the present invention;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the cylinder sleeve of the present invention;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the sealing pad of the present invention;

[0024] Figure 6 Schematic diagram of the three-dimensional structure of the piston rod of the present invention;

[0025] Figure 7 This is a schematic diagram of the three-dimensional structure of the motor plate of the present invention;

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the lead screw of the present invention.

[0027] Explanation of the accompanying drawings: 1. Cylinder body; 101. Motor plate; 102. Groove; 2. Cylinder liner; 201. Flat key; 202. Sealing gasket; 3. Bottom cover; 301. First bearing sleeve; 302. Second bearing sleeve; 4. Piston rod; 401. Keyway; 402. Nut; 403. L-plate; 5. Driving motor; 501. First bearing; 502. Driving gear; 6. Lead screw; 601. Second bearing; 602. Driven gear; 7. Support bearing; 701. Support bearing pressure plate; 8. Proximity switch; 9. Pick head; 10. Rubber pad; 11. Pressure ring. DETAILED DESCRIPTION

[0028] The core of the present invention is to provide an electric vehicle lift, which can solve the defects of huge investment and long construction period when a pneumatic vehicle lift is converted into an electric vehicle lift.

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "middle", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0031] With reference to the accompanying drawings, Figure 1 Schematic diagram of the three-dimensional structure of the electric vehicle lifting machine of the present invention; Figure 2 It is a schematic cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the bottom cover of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the cylinder sleeve of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the sealing pad of the present invention; Figure 6 Schematic diagram of the three-dimensional structure of the piston rod of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the motor plate of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the lead screw of the present invention.

[0032] like Figures 1 to 8 As shown, it includes a cylinder body 1, a cylinder sleeve 2, a bottom cover 3 and a jacking assembly. The jacking assembly includes a piston rod 4, which is coaxial and slides up and down in the cylinder body 1. The cylinder sleeve 2 is coaxially slidably sleeved on the piston rod 4. The cylinder sleeve 2 is coaxially fixed to the top of the cylinder body 1 with bolts. The bottom cover 3 and the bottom end of the cylinder body 1 are provided with a sealing ring and fixed to the bottom end of the cylinder body 1. It also includes a drive motor 5, a screw 6 and a nut 402. The screw 6 is coaxially arranged in the middle hole of the piston rod 4, and the nut 402 is coaxially fixedly connected to the bottom end of the middle hole of the piston rod 4; the screw 6 is threadedly connected to the nut 402, and the bottom end of the screw 6 extends out of the piston rod 4. The drive motor 5 is installed at the bottom of the cylinder body 1, and the drive motor 5 is connected to the bottom end of the screw 6; the piston rod 4 is keyed to the cylinder sleeve 2.

[0033] It is understandable that the jacking assembly also includes a pick 9, the bottom of the pick 9 is threadedly connected to the inner wall of the piston rod 4, and the top of the pick 9 is bonded with a rubber pad 10. A through hole is provided on the cylinder body 1 for the wire of the drive motor 5 to pass through, and is sealed with a rubber ring.

[0034] The nut 402 is welded, nested or threadedly connected to the piston rod 4. When threaded connection is adopted, fastening glue is applied to the threads to prevent the nut 402 and the lead screw 6 from rotating synchronously.

[0035] The cylinder 1 further includes a support bearing 7, which is coaxially fixedly mounted on the top of the lead screw 6. The outer ring of the support bearing 7 slides in contact with the inner wall of the piston rod 4. Specifically, the inner ring of the support bearing 7 is interference-fitted at a step on the top of the lead screw 6. The support bearing 7 is restrained by a support bearing pressure plate 701 to prevent it from falling out of the lead screw 6. The support bearing pressure plate 701 is bolted to the top of the lead screw 6. The outer ring of the support bearing 7 slides in contact with the inner wall of the piston rod 4. The inner wall of the cylinder 1 is coated with lubricating oil.

[0036] A motor plate 101 is fixed to the bottom of the inner cavity of the cylinder body 1, and the drive motor 5 is vertically installed on the top surface of the motor plate 101 with bolts downward. The output shaft of the drive motor 5 passes downward through the motor plate 101 and is installed with a driving gear 502. The screw 6 rotatably passes through the motor plate 101 and is installed with a driven gear 602. The driving gear 502 is fixed to the output shaft of the drive motor 5 by bolts, and the driven gear 602 is fixed to the bottom step of the screw 6 by bolts. The driving gear 502 is meshed with the driven gear 602. Specifically, the motor plate 101 and the cylinder body 1 can be threadedly connected or welded, preferably threadedly connected for ease of later maintenance; threaded connection is adopted: an internal thread is provided at the bottom of the inner cavity of the cylinder body 1, and an external thread is provided on the outer wall of the motor plate 101. The motor plate 101 is threadedly connected to the bottom of the inner cavity of the cylinder body 1. In order to prevent the motor plate 101 from rotating at will during operation, fastening glue can be applied to the thread, or a groove 102 can be opened on the side of the motor plate 101. A top screw is threadedly connected to the outer wall of the cylinder body 1, and the inner end of the top screw is stuck in the groove 102.

[0037] It also includes a first bearing 501 and a second bearing 601, which are mounted on the top surface of the bottom cover 3. The output shaft end of the drive motor 5 is interference-fitted with the inner ring of the first bearing 501. The step at the bottom end of the lead screw 6 is interference-fitted with the inner ring of the second bearing 601, and the stepped end face of the bottom end of the lead screw 6 is supported by the inner ring end face of the second bearing 601. Figure 2 and 3 As shown, the first bearing 501 and the second bearing 601 are both tapered roller bearings. The first bearing 501 is installed in the first bearing sleeve 301 of the bottom cover 3, and the second bearing 601 is installed in the second bearing sleeve 302 of the bottom cover 3.

[0038] It also includes two proximity switches 8 and an L-plate 403. The first proximity switch 8 is bolted to the bottom surface of the cylinder liner 2, and the second proximity switch 8 is bolted to the top surface of the motor plate 101. The two proximity switches 8 are located in the same vertical direction. The L-plate 403 is bolted to the bottom of the piston rod 4, and is located vertically between the two proximity switches 8. It will be understood that the cylinder body 1 has a through hole for the wires of the proximity switches 8 to pass through, which is sealed with rubber.

[0039] The cylinder liner 2 and the piston rod 4 are coaxially provided with a sealing plate 202 and a pressure ring 11. The sealing plate 202 is pressed against the pressure ring 11 and fixedly connected to the cylinder liner 2 by bolts. The sealing plate 202 is used to seal the gap between the cylinder liner 2 and the piston rod 4.

[0040] A key groove 401 is provided on the outer wall of the piston rod 4 and arranged along the length direction of the piston rod 4 . A flat key 201 matching the key groove 401 is provided on the inner wall of the cylinder sleeve 2 . The key groove 401 and the flat key 201 are slidably fitted.

[0041] The working principle of an electric car lift of the present invention is as follows: the original pneumatic car lift is taken out of the foundation pit, the cylinder body of the original pneumatic car lift can be modified to form the cylinder body 1 of the present application, and other components are assembled. There is no need to re-excavate the foundation pit, the investment is small, the construction period is short, and the original pneumatic car lift can be converted into an electric car lift by driving the piston rod 4 through the screw 6.

[0042] The operation and forward and reverse rotation of the drive motor 5 are controlled by an external controller, and the proximity switch 8 is connected to the controller. The proximity switch 8 can send a signal to the controller to stop the drive motor 5. Under normal circumstances, the piston rod 4 is in a retracted state, the drive motor 5 is started, the drive motor 5 rotates forward, the active gear 502 drives the driven gear 602 to rotate, the screw 6 rotates synchronously, the screw 6 and the nut 402 are threaded, and the nut 402 drives the piston rod 4 to lift, and at the same time the pick head 9 rises, and the rubber pad 10 abuts against the bottom beam of the railway freight car depot. When the distance between the L plate 403 and the first proximity switch 8 reaches the set value, the first proximity switch 8 sends a signal to the controller to stop the drive motor 5, and the drive motor 5 stops running; when the drive motor 5 is started and reversed, the piston rod 4 retracts. When the distance between the L plate 403 and the second proximity switch 8 reaches the set value, the second proximity switch 8 sends a stop signal to the controller, and the drive motor 5 stops running.

[0043] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. Similar parts between the various embodiments can be referred to in conjunction with each other, and the various embodiments can be combined with each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For relevant parts, refer to the method description.

[0044] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art shall fall within the scope of protection defined by the claims of the present invention.

Claims

1. An electric vehicle lift, comprising a cylinder body (1), a cylinder sleeve (2), a bottom cover (3) and a lifting assembly, wherein the lifting assembly comprises a piston rod (4), the piston rod (4) being coaxially and slidingly arranged in the cylinder body (1), the cylinder sleeve (2) being coaxially slidably sleeved on the piston rod (4), the cylinder sleeve (2) being coaxially fixed to the top end of the cylinder body (1), and the bottom cover (3) being sealingly fixed to the bottom end of the cylinder body (1), characterized in that: It also includes a drive motor (5), a lead screw (6) and a nut (402), wherein the lead screw (6) is coaxially arranged in the hole of the piston rod (4), and the nut (402) is coaxially fixedly connected to the bottom end of the hole of the piston rod (4); the lead screw (6) and the nut (402) are threadedly connected, and the bottom end of the lead screw (6) extends out of the piston rod (4); the drive motor (5) is installed at the bottom of the cylinder body (1), and the drive motor (5) is transmission-connected to the bottom end of the lead screw (6); the piston The rod (4) is connected to the cylinder sleeve (2) by a sliding key; a motor plate (101) is fixed to the bottom of the inner cavity of the cylinder body (1); the drive motor (5) is vertically installed on the top surface of the motor plate (101); the output shaft of the drive motor (5) passes through the motor plate (101) downward and is installed with a driving gear (502); the lead screw (6) rotatably passes through the motor plate (101) and is installed with a driven gear (602); the driving gear (502) is meshed with the driven gear (602).

2. The electric vehicle lift according to claim 1, characterized in that: It also includes a support bearing (7), which is coaxially fixedly mounted on the top end of the lead screw (6), and the outer ring of the support bearing (7) is in sliding engagement with the inner wall of the piston rod (4).

3. The electric vehicle lift according to claim 1, characterized in that: The bottom of the inner cavity of the cylinder body (1) is provided with an internal thread, the outer wall of the motor plate (101) is provided with an external thread, and the motor plate (101) is threadedly connected to the bottom of the inner cavity of the cylinder body (1); a groove (102) is provided on the side of the motor plate (101), and a top screw is threadedly connected on the outer wall of the cylinder body (1), and the inner end of the top screw is inserted into the groove (102).

4. The electric vehicle lift according to claim 1, characterized in that: The invention also includes a first bearing (501) and a second bearing (601), wherein the first bearing (501) and the second bearing (601) are mounted on the top surface of the bottom cover (3), the output shaft end of the drive motor (5) is interference-fitted with the inner ring of the first bearing (501), the step at the bottom end of the lead screw (6) is interference-fitted with the inner ring of the second bearing (601), and the stepped end face of the bottom end of the lead screw (6) is supported on the inner ring end face of the second bearing (601).

5. The electric vehicle lift according to claim 4, characterized in that: It also includes two proximity switches (8) and an L-plate (403), wherein the first proximity switch (8) is installed on the bottom surface of the cylinder sleeve (2), and the second proximity switch (8) is installed on the top surface of the motor plate (101), and the two proximity switches (8) are located in the same vertical direction, and the L-plate (403) is fixed to the bottom of the piston rod (4), and the L-plate (403) is located between the two proximity switches (8) in the vertical direction.

6. The electric vehicle lift according to claim 1, characterized in that: It also includes a sealing plate (202) and a pressure ring (11), wherein the sealing plate (202) is coaxially arranged between the cylinder sleeve (2) and the piston rod (4), and the pressure ring (11) presses the sealing plate (202), and the pressure ring (11) is fixedly connected to the cylinder sleeve (2).

7. The electric vehicle lift according to claim 1, characterized in that: The outer wall of the piston rod (4) is provided with a key groove (401), and the key groove (401) is arranged along the length direction of the piston rod (4). The inner wall of the cylinder sleeve (2) is provided with a flat key (201) matching the key groove (401), and the key groove (401) and the flat key (201) are slidably matched.

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