New energy vehicle battery replacement lifting device

Abstract

The utility model relates to a new energy vehicle battery replacement lifting device, and belongs to the technical field of new energy vehicle battery replacement. The lifting device comprises a machine frame, a front lifting mechanism and a rear lifting mechanism, the front lifting mechanism and the rear lifting mechanism each comprise a bearing frame, a lifting frame arranged on the bearing frame and a shear type lifting structure used for driving the lifting frame to ascend and descend, and the bearing frames are fixedly arranged on the machine frame or arranged on the machine frame in a position-adjustable mode. The lifting frame is arranged on the bearing frame through the shear type lifting structure; the lifting frame is provided with a lifting plane or a lifting point used for lifting and leveling the new energy vehicle. And the height position of the lifting point is adjustable. The number of lifting points on the lifting mechanism is four, and the distance between every two adjacent lifting points is adjustable. The lifting device is simple in structure, convenient to operate, stable in lifting process, stable and reliable in lifting and supporting, small in space required by each part, and very suitable for lifting of a new energy vehicle during battery replacement.

Description

Technical Field

[0001] The utility model relates to a power exchange lifting device for new energy vehicles, belonging to the technical field of power exchange for new energy vehicles. Background Technique

[0002] At present, among new energy vehicles with the largest usage, private cars account for a considerable proportion. It is difficult for people to spare time to deal with the problem of charging and energy replenishment of new energy vehicles. Therefore, the fundamental way to overcome the development bottleneck of new energy vehicles is rapid power exchange. Replacing the battery has become one of the ways to quickly replenish energy for new energy vehicles. When the battery decays to the point where it needs to be replaced, the battery can be replaced in time. Basically, the battery of a new energy vehicle is installed on the bottom plate between the front and rear wheels of the vehicle, so it is necessary to lift the body of the new energy vehicle and then take out the battery. To meet the requirements of the cruising range of new energy vehicles, the battery is generally heavy, so there are also requirements for the lifting height of the vehicle body. How to lift the new energy vehicle smoothly for battery replacement is an urgent problem to be solved. In addition, if the vehicle body is tilted after lifting, it is not conducive to the taking and placing of the battery. Therefore, it is also required that the battery in the vehicle body can be kept horizontal after lifting to avoid damage to the vehicle when the battery enters and exits the vehicle body. Summary of the Invention

[0003] Aiming at the deficiencies existing in the prior art, the utility model provides a power exchange lifting device for new energy vehicles.

[0004] The technical solution of the utility model to solve the above technical problems is as follows: A power exchange lifting device for new energy vehicles includes a frame and a lifting mechanism arranged on the frame. The lifting mechanism includes a front lifting mechanism and a rear lifting mechanism. Both the front lifting mechanism and the rear lifting mechanism include a bearing frame, a lifting frame arranged on the bearing frame, and a scissor lifting structure for driving the lifting frame to lift. The bearing frame is fixedly arranged on the frame or is arranged on the frame with adjustable position. The lifting frame is arranged on the bearing frame through the scissor lifting structure;

[0005] A lifting plane or lifting point for lifting and leveling the new energy vehicle is arranged on the lifting frame.

[0006] The beneficial effects of the present utility model are as follows: The positions of the front lifting mechanism and the rear lifting mechanism on the frame can be arranged according to the lifting positions of the new energy vehicles to be lifted. The carrier frame of the lifting mechanism is installed on the frame, and the lifting of the lifting frame is controlled by driving the scissor lifting structure, so as to achieve the stable lifting of the new energy vehicle placed on the lifting frame. The front and rear lifting mechanisms can be lifting planes capable of carrying new energy vehicles, and the vehicle body bottom or the battery rack at the vehicle body bottom is supported by the lifting plane. Of course, it can also be multiple lifting points, and the lifting points only need to correspond to the lifting positions at the bottom of the vehicle body or the battery rack. The structure of the present utility model is simple, the operation is convenient, the lifting process is stable, the lifting support is stable and reliable, and the space required for each component is not large, which is very suitable for the lifting of new energy vehicle battery swapping.

[0007] On the basis of the above technical solution, the present utility model can also be improved as follows.

[0008] Further, the height position of the lifting point is adjustable.

[0009] The beneficial effect of adopting the above further solution is that the lifting point can be individually fine-tuned in its height direction, preparing for the leveling of the new energy vehicle, ensuring that the battery in the vehicle body of the lifted new energy vehicle is in a horizontal state, and facilitating the taking and placing of the battery in the vehicle body.

[0010] Further, there are four lifting points on the lifting mechanism, and the distance between adjacent lifting points is adjustable.

[0011] The beneficial effect of adopting the above further solution is that it can be the distance between the lifting points on the front lifting mechanism and the rear lifting mechanism, adjusting the front and rear positions of the lifting points, or the distance between the lifting points on the same lifting mechanism can be adjustable, adjusting the left and right positions of the lifting points. By adjusting the front, rear, left, and right positions of the lifting points, it can be used for the lifting and leveling of more different models of new energy vehicles.

[0012] Further, a positioning disk is provided at each lifting point, the positioning disk is arranged on an adjusting screw rod, and the adjusting screw rod is threadedly connected with the lifting frame.

[0013] The beneficial effect of adopting the above further solution is that by rotating the adjusting screw rod, it can be finely adjusted through the thread of the adjusting screw rod, adjusting the height of the adjusting screw rod, and thus adjusting the height of the positioning disk, realizing the leveling of each lifting point. It not only realizes the lifting of the new energy vehicle, but also ensures the leveling of the lifted vehicle, facilitating the taking and placing of the battery.

[0014] Further, two lifting points are provided on the lifting frame of the front lifting mechanism, and two lifting points are provided on the lifting frame of the rear lifting mechanism. The adjusting screw rod is threadedly connected to the sliding plate. The sliding plate is arranged at the left end and the right end of the lifting frame. A slideway for the horizontal movement of the sliding plate is provided on the lifting frame, and the adjusted sliding plate is connected to the lifting frame through a fastener.

[0015] The beneficial effect of adopting the above further solution is that two lifting points are provided on each of the front and rear lifting mechanisms, realizing four-point support for the new energy vehicle. The positions of the lifting points between the front lifting mechanism and the rear lifting mechanism are not only adjustable in the front and rear directions, but also the positions between the lifting points on the same lifting mechanism are adjustable in the left and right directions. Specifically, the sliding plate can be arranged to move left and right on the lifting frame, and the distance between the two sliding plates on the lifting frame can be adjusted, so as to adjust the distance between the positioning discs on the same lifting frame, and can adapt to the lifting positions of different vehicle models or different lifting positions of the same vehicle, realizing the lifting and four-point leveling of the new energy vehicle.

[0016] Further, the carrier frame is slidably arranged on the machine frame. A guide rail is provided on the machine frame, and a slider adapted to the guide rail is provided on the carrier frame.

[0017] The beneficial effect of adopting the above further solution is that in order to facilitate the adjustment of the positions of the front and rear lifting mechanisms on the machine frame, a guide rail can be arranged along the length direction of the machine frame, and a slider capable of sliding along the guide rail is arranged at the bottom of the carrier frame of the lifting mechanism, making the position adjustment more convenient.

[0018] Further, the front lifting mechanism is arranged on the machine frame through a front and rear moving mechanism, and / or the rear lifting mechanism is arranged on the machine frame through a front and rear moving mechanism.

[0019] The beneficial effect of adopting the above further solution is that one of the front and rear lifting mechanisms can be adjustable in position and the other can be fixedly arranged, or both can be adjustable in position. The front lifting mechanism can be arranged on the machine frame through a front and rear moving mechanism. Under the action of the front and rear moving mechanism, the position of the front lifting mechanism is adjustable, and the corresponding rear lifting mechanism can be fixedly arranged on the machine frame or can be arranged on the machine frame with adjustable position through a front and rear moving mechanism; when the rear lifting mechanism is arranged on the machine frame through a front and rear moving mechanism, under the action of the front and rear moving mechanism, the position of the rear lifting mechanism is adjustable, and at this time, the front lifting mechanism can be fixedly arranged on the machine frame or can be arranged on the machine frame with adjustable position through a front and rear moving mechanism. The adjustable position of the front lifting mechanism and / or the rear lifting mechanism can adjust the position of the lifting frame, so that its lifting plane or lifting point can correspond to the lifting position on the new energy vehicle, facilitating the stable lifting of the new energy vehicle.

[0020] Further, the front-back movement mechanism includes a movement motor, a driving gear, and a rack engaged with the driving gear. The movement motor is disposed on the carrier, the rack is disposed on the frame, and the driving gear is disposed on the output shaft of the movement motor.

[0021] The beneficial effect of adopting the above further solution is that the movement motor can be a servo motor. When the movement motor operates, the driving gear rotates, which can drive the carrier to move along the length direction of the frame, and can adjust the positions of the front lifting mechanism and / or the rear lifting mechanism on the frame; specifically, the positions of the lifting frames of the front and rear lifting mechanisms can be adjusted according to the length of the vehicle or the positions of adjacent lifting points on the vehicle, so that the lifting device can be applicable to the lifting of more new energy vehicles.

[0022] Further, the scissor lift structure includes a pair of fork-shaped arm assemblies and a lifting drive mechanism for driving the fork-shaped arm assemblies to lift.

[0023] Further, the fork-shaped arm assembly includes a first arm and a second arm hinged in the middle. The bottom end of the first arm is hinged to the carrier, the top end of the first arm is slidably or rollably connected to the lifting frame, the bottom end of the second arm is slidably or rollably connected to the carrier, the top end of the second arm is hinged to the lifting frame, and the driving end of the lifting drive mechanism is connected to the bottom end of the second arm.

[0024] The beneficial effect of adopting the above further solution is that the structure of the scissor lift structure is simple and compact, and can realize the vertical lifting of the lifting frame. It can not only meet the requirements of the lifting height, but also requires a small installation space itself, making the use occasions of the lifting device more extensive.

[0025] Further, the lifting drive mechanism includes a lifting motor, a lead screw, and a lead screw nut. The lead screw is rotatably disposed on the carrier, the output shaft of the lifting motor is connected to the lead screw, a connecting rod is disposed between the bottom ends of a pair of the second arms, and the connecting rod is connected to the lead screw nut.

[0026] The beneficial effect of adopting the above further solution is that when the lifting motor operates, it drives the lead screw to rotate, and the lead screw nut can move along the axis direction of the lead screw, thereby driving the bottom end of the second arm to move in the direction of approaching or departing from the bottom end of the first arm, realizing the lifting and lowering actions of the scissor lift structure and the lifting and lowering actions of the lifting frame on the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the present invention;

[0028] Figure 2 is a front view structural diagram of the present invention;

[0029] Figure 3 is Figure 2 a schematic cross-sectional structure diagram along the A-A direction in

[0030] Figure 4 a schematic structure diagram of the lifting mechanism of the present utility model;

[0031] In the figure, 1 is the frame; 2 is the front lifting mechanism; 3 is the rear lifting mechanism; 4 is the carrier; 5 is the lifting frame; 6 is the positioning disk; 7 is the adjusting screw rod; 8 is the pull-out plate; 9 is the slideway; 10 is the guide rail; 11 is the moving motor; 12 is the driving gear; 13 is the rack; 14 is the first arm; 15 is the second arm; 16 is the roller; 17 is the lifting motor; 18 is the lead screw; 19 is the lead screw nut; 20 is the long strip through hole. Specific embodiments

[0032] The principles and features of the present utility model will be described below in conjunction with examples. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0033] As Figures 1-4 shown, a power battery replacement lifting device for a new energy vehicle includes a frame 1 and a lifting mechanism provided on the frame 1. The lifting mechanism includes a front lifting mechanism 2 and a rear lifting mechanism 3. Both the front lifting mechanism 2 and the rear lifting mechanism 3 include a carrier 4, a lifting frame 5 provided on the carrier 4, and a scissor lifting structure for driving the lifting frame 5 to perform a lifting action. The carrier 4 is fixedly provided on the frame 1 or is provided on the frame 1 with adjustable position. The lifting frame 5 is provided on the carrier 4 through the scissor lifting structure;

[0034] The lifting frame 5 is provided with a lifting plane or a lifting point for lifting and leveling the new energy vehicle.

[0035] The height position of the lifting point is adjustable. The lifting point can be individually fine-tuned in the height direction to prepare for leveling the new energy vehicle.

[0036] There are four lifting points of the lifting mechanism, and the distance between adjacent lifting points is adjustable. The four lifting points are respectively provided on the front lifting mechanism 2 and the rear lifting mechanism 3. It can be the distance between the lifting points on the front lifting mechanism 2 and the rear lifting mechanism 3, and what is adjusted is the front and rear positions of the lifting points. It can also be that the distance between the lifting points on the same lifting mechanism is adjustable, and what is adjusted is the left and right positions of the lifting points. By adjusting the front, rear, left and right positions of the lifting points, it can be used for lifting and leveling more different models of new energy vehicles.

[0037] A positioning disk 6 is provided at each of the lifting points. The positioning disk 6 is arranged on an adjusting screw rod 7, and the adjusting screw rod 7 is threadedly connected to the lifting frame 5. By rotating the adjusting screw rod 7, fine adjustment can be performed through the thread of the adjusting screw rod 7 to adjust the height of the adjusting screw rod 7, thereby adjusting the height of the positioning disk 6, achieving the leveling of each lifting point, not only realizing the lifting of new energy vehicles, but also ensuring the leveling of the lifted vehicle, which is convenient for the taking and placing of the battery.

[0038] There are two lifting points on the lifting frame 5 of the front lifting mechanism 2, and there are two lifting points on the lifting frame 5 of the rear lifting mechanism 3. The adjusting screw rod 7 is threadedly connected to the draw plate 8. The draw plate 8 is arranged at the left end and the right end of the lifting frame 5. The lifting frame 5 is provided with a slideway 9 for the horizontal movement of the draw plate 8. The adjusted draw plate 8 is connected to the lifting frame 5 through a fastener. Two lifting points are arranged on each of the front and rear lifting mechanisms 3, realizing the four-point support of new energy vehicles. The positions of the lifting points between the front lifting mechanism 2 and the rear lifting mechanism 3 are not only adjustable in the front and rear directions, but also the positions of the lifting points on the same lifting mechanism are adjustable in the left and right directions. Specifically, the draw plate 8 can be arranged to move left and right on the lifting frame 5, and the distance between the two draw plates 8 on the lifting frame 5 can be adjusted, thereby adjusting the distance between the positioning disks 6 on the same lifting frame 5, and being able to adapt to the lifting positions of different vehicle models or different lifting positions of the same vehicle, realizing the lifting and four-point leveling of new energy vehicles.

[0039] The draw plate 8 is provided with a long strip through hole 20, and the lifting frame 5 is provided with a fastening hole. After the position of the draw plate 8 is adjusted in place, the fastener passes through the fastening hole and the long strip through hole 20 and is locked by a nut, and the draw plate 8 can be stably positioned on the lifting frame 5.

[0040] The carrier frame 4 is slidably arranged on the frame 1. The frame 1 is provided with a guide rail 10, and the carrier frame 4 is provided with a slider adapted to the guide rail 10. In order to facilitate the adjustment of the positions of the front and rear lifting mechanisms 3 on the frame 1, the guide rail 10 can be arranged along the length direction of the frame 1, and the bottom of the carrier frame 4 of the lifting mechanism is provided with a slider capable of sliding along the guide rail 10, making the position adjustment more convenient.

[0041] The front lifting mechanism 2 is arranged on the frame 1 through a front-back moving mechanism, and / or the rear lifting mechanism 3 is arranged on the frame 1 through a front-back moving mechanism. One of the front and rear lifting mechanisms 3 can be adjustable in position, and the other can be fixedly arranged. It is also possible that both are adjustable in position. The front lifting mechanism 2 can be arranged on the frame 1 through a front-back moving mechanism. Under the action of the front-back moving mechanism, the position of the front lifting mechanism 2 is adjustable, while the corresponding rear lifting mechanism 3 can be fixedly arranged on the frame 1 or can be arranged on the frame 1 with its position adjustable through a front-back moving mechanism; when the rear lifting mechanism 3 is arranged on the frame 1 through a front-back moving mechanism, under the action of the front-back moving mechanism, the position of the rear lifting mechanism 3 is adjustable, and at this time, the front lifting mechanism 2 can be fixedly arranged on the frame 1 or can be arranged on the frame 1 with its position adjustable through a front-back moving mechanism. The adjustable position of the front lifting mechanism 2 and / or the rear lifting mechanism 3 can adjust the position of the lifting frame 5 so that its lifting plane or lifting point can correspond to the lifting position on the new energy vehicle, facilitating the stable lifting of the new energy vehicle.

[0042] The front-back moving mechanism includes a moving motor 11, a driving gear 12, and a rack 13 meshing with the driving gear 12. The moving motor 11 is arranged on the carrier frame 4, the rack 13 is arranged on the frame 1, and the driving gear 12 is arranged on the output shaft of the moving motor 11. The moving motor 11 can be a servo motor. When the moving motor 11 operates, the driving gear 12 rotates, which can drive the carrier frame 4 to move along the length direction of the frame 1, and can adjust the position of the front lifting mechanism 2 and / or the rear lifting mechanism 3 on the frame 1; specifically, the position of the lifting frame 5 of the front and rear lifting mechanisms 3 can be adjusted according to the length of the vehicle or the position of adjacent lifting points on the vehicle, so that the lifting device can be applicable to the lifting of more new energy vehicles.

[0043] The scissor lift structure includes a pair of fork-shaped arm assemblies and a lifting drive mechanism for driving the fork-shaped arm assemblies to lift.

[0044] The fork-shaped arm assembly includes a first arm 14 and a second arm 15 hinged in the middle. The bottom end of the first arm 14 is hinged to the carrier frame 4, the top end of the first arm 14 is slidably or rollably connected to the lifting frame 5, the bottom end of the second arm 15 is slidably or rollably connected to the carrier frame 4 to form a movable end, the top end of the second arm 15 is hinged to the lifting frame 5, and the driving end of the lifting drive mechanism is connected to the bottom end of the second arm 15. The structure of the scissor lift structure is simple and compact, and can realize the vertical lifting of the lifting frame 5. It can not only meet the requirements of the lifting height, but also requires a small installation space itself, making the application occasions of the lifting device more extensive.

[0045] The lifting drive mechanism includes a lifting motor 17, a lead screw 18 and a lead screw nut 19. The lead screw 18 is rotatably arranged on the carrier 4. The output shaft of the lifting motor 17 is connected to the lead screw 18. A connecting rod is provided between the bottom ends of a pair of second arms 15, and the connecting rod is connected to the lead screw nut 19. The lifting motor 17 is actuated to drive the lead screw 18 to rotate, and the lead screw nut 19 can move along the axis direction of the lead screw 18, thereby driving the bottom end of the second arm 15 to move in a direction close to or away from the bottom end of the first arm 14, thereby realizing the lifting and lowering action of the scissor lift structure, and the lifting and lowering action of the lifting frame 5 on the vehicle.

[0046] A roller 16 is provided at the bottom end of the second support arm 15, and a raceway for limiting the position of the roller 16 is provided on the support frame 4; a roller 16 may also be provided at the top end of the first support arm 14, and a raceway for limiting the position of the roller 16 is provided at the bottom of the lifting frame 5.

[0047] There are two lifting points on the front lifting mechanism 2, and two lifting points on the rear lifting mechanism 3. The front lifting mechanism 2 and the rear lifting mechanism 3 are respectively arranged on the frame 1 through the front and rear moving mechanisms. Before lifting, the front and rear positions of the front lifting mechanism 2 and the rear lifting mechanism 3 on the frame 1 can be adjusted according to the different lifting positions on the body of the new energy vehicle to be lifted or the battery rack, and the left and right positions of the pull-out plate 8 on the lifting frame 5 can be adjusted, and the height of the positioning plate 6 can be adjusted by rotating the adjusting screw rod 7, so that the front, rear, left and right positions of the four lifting points are adjusted in place, and the lifting position of the front lifting mechanism 2 and the rear lifting mechanism 3 on the frame 1 can be adjusted according to the different lifting positions on the body of the new energy vehicle to be lifted or the battery rack. Now the four lifting points meet the leveling requirements, the new energy vehicle drives to the working platform, and the lifting device is located under the new energy vehicle after the new energy vehicle is in place, the scissor-type lifting structure of the front and rear lifting mechanisms 3 is actuated, the lifting frame 5 rises, and the positioning plate 6 corresponds to the lifting position of the bottom of the vehicle body, and the top of the new energy vehicle is steadily lifted to the required height, and then the battery on the new energy vehicle can be replaced. The specific replacement can be to pull out the battery by pulling it out from the side and then replace it with a fully charged battery. After the battery is replaced, the scissor-type lifting structure is actuated, the lifting frame 5 is lowered and reset, and the vehicle can be driven out.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery replacement lifting device for new energy vehicles, characterized in that: The invention comprises a frame (1) and a lifting mechanism arranged on the frame (1), wherein the lifting mechanism comprises a front lifting mechanism (2) and a rear lifting mechanism (3), wherein the front lifting mechanism (2) and the rear lifting mechanism (3) each comprise a bearing frame (4), a lifting frame (5) arranged on the bearing frame (4), and a scissor-type lifting structure for driving the lifting frame (5) to move upward and downward, wherein the bearing frame (4) is fixedly arranged on the frame (1) or is adjustably arranged on the frame (1), and the lifting frame (5) is arranged on the bearing frame (4) via the scissor-type lifting structure; The lifting frame (5) is provided with a lifting plane or a lifting point for lifting and leveling the new energy vehicle.

2. The battery replacement lifting device for new energy vehicles according to claim 1 is characterized in that: The height position of the lifting point is adjustable, and / or the lifting mechanism is provided with four lifting points, and the distance between adjacent lifting points is adjustable.

3. The battery replacement lifting device for new energy vehicles according to claim 2 is characterized in that: A positioning plate (6) is provided at each lifting point. The positioning plate (6) is arranged on an adjusting screw rod (7). The adjusting screw rod (7) is threadedly connected to the lifting frame (5).

4. The battery replacement lifting device for new energy vehicles according to claim 3 is characterized in that: The lifting frame (5) of the front lifting mechanism (2) is provided with two lifting points, and the lifting frame (5) of the rear lifting mechanism (3) is provided with two lifting points. The adjusting screw rod (7) is threadedly connected to the pull-out plate (8). The pull-out plate (8) is arranged on the left end and the right end of the lifting frame (5). The lifting frame (5) is provided with a slideway (9) for the pull-out plate (8) to move horizontally. The pull-out plate (8) adjusted in place is connected to the lifting frame (5) via fasteners.

5. The battery replacement lifting device for new energy vehicles according to claim 1 is characterized in that: The bearing frame (4) is slidably arranged on the frame (1); a guide rail (10) is provided on the frame (1); and a sliding block adapted to the guide rail (10) is provided on the bearing frame (4).

6. The battery replacement lifting device for new energy vehicles according to any one of claims 1 to 5, characterized in that: The front lifting mechanism (2) is arranged on the frame (1) via a front-rear moving mechanism, and / or the rear lifting mechanism (3) is arranged on the frame (1) via a front-rear moving mechanism.

7. The battery replacement lifting device for new energy vehicles according to claim 6 is characterized in that: The forward and backward moving mechanism comprises a moving motor (11), a driving gear (12) and a rack (13) meshing with the driving gear (12); the moving motor (11) is arranged on the supporting frame (4), the rack (13) is arranged on the frame (1), and the driving gear (12) is arranged on the output shaft of the moving motor (11).

8. The battery replacement lifting device for new energy vehicles according to any one of claims 1 to 5, characterized in that: The scissor-type lifting structure comprises a pair of fork-type arm assemblies and a lifting drive mechanism for driving the fork-type arm assemblies to lift and lower.

9. The battery replacement lifting device for new energy vehicles according to claim 8 is characterized in that: The fork-type arm assembly comprises a first arm (14) and a second arm (15) which are hinged in the middle, the bottom end of the first arm (14) is hinged to the support frame (4), the top end of the first arm (14) is connected to the lifting frame (5) in a sliding or rolling manner, the bottom end of the second arm (15) is connected to the support frame (4) in a sliding or rolling manner, the top end of the second arm (15) is hinged to the lifting frame (5), and the driving end of the lifting drive mechanism is connected to the bottom end of the second arm (15).

10. The battery replacement lifting device for new energy vehicles according to claim 9, characterized in that: The lifting drive mechanism comprises a lifting motor (17), a lead screw (18) and a lead screw nut (19); the lead screw (18) is rotatably arranged on the support frame (4); the output shaft of the lifting motor (17) is connected to the lead screw (18); a connecting rod is arranged between the bottom ends of a pair of second support arms (15); the connecting rod is connected to the lead screw nut (19).

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