A drive mechanism for a stair-climbing wheelchair

Abstract

The utility model discloses a kind of transmission mechanism of ladder wheelchair, under the condition that front and rear track structure does not need to be staggered, synchronous operation can also be carried out;It includes chassis, chassis includes two supports arranged symmetrically, two supports are connected by support tube;Support is equipped with track unit and drive unit, track unit includes driving wheel, transmission wheel, driven wheel and ladder track, ladder track transmission connection driving wheel, transmission wheel and driven wheel;Drive unit includes motor, first transmission shaft and second transmission shaft arranged on support, first transmission shaft and second transmission shaft are rotatably connected with support, motor drives first transmission shaft rotation;First transmission shaft is arranged in one of the driving wheel of support and rotatably cooperated with it, second transmission shaft is arranged in another driving wheel of support and fixedly cooperated with it;First transmission shaft and second transmission shaft are transmission connected by speed reduction module, two driving wheels of support are transmission connected by synchronous module, belong to wheelchair technical field.

Description

Technical Field

[0001] This utility model belongs to the field of wheelchair technology, and more specifically, relates to a transmission mechanism for a ladder wheelchair. Background Technology

[0002] Patent 202411633356.9 discloses a power transmission mechanism for a tracked electric vehicle, including a pair of track motion mechanisms installed on both sides of the bottom of the electric vehicle. Each pair of track motion mechanisms includes a transmission frame, a front track motion structure, and a rear track motion structure. The front track motion structure and the rear track motion structure are respectively installed at the front and rear ends of the transmission frame. The transmission frame includes an outer side plate, a middle side plate, and an inner side plate. The outer side plate, the middle side plate, and the inner side plate are fixedly installed on the bottom of both sides of the electric vehicle from the outside to the inside. The front track motion structure is installed at the front end of the middle side plate and the inner side plate.

[0003] In the aforementioned power transmission mechanism, both the front track synchronous pulley and the rear track synchronous pulley are fixedly mounted on the motor extension shaft, so that the front track synchronous pulley and the rear track synchronous pulley can rotate synchronously and in the same direction. This method requires the front track motion structure and the rear track motion structure to be misaligned, so the frame needs to be wider. Furthermore, the size of the linkage tube needs to vary according to the spacing between the inner side plates and the middle side plates, making it impossible to standardize the size. Utility Model Content

[0004] The main purpose of this invention is to provide a transmission mechanism for a ladder wheelchair that can operate synchronously without requiring misalignment of the front and rear track structures.

[0005] According to a first aspect of the present invention, a transmission mechanism for a ladder-climbing wheelchair is provided, comprising a chassis, the chassis comprising two symmetrically arranged supports, the two supports being connected by a support tube;

[0006] The support frame is equipped with track units and a drive unit. There are two track units arranged one in front of the other.

[0007] The track unit includes a drive wheel, a transmission wheel, a driven wheel, and a ladder track, and the ladder track is drivingly connected to the drive wheel, the transmission wheel, and the driven wheel;

[0008] The drive unit includes a motor, a first drive shaft, and a second drive shaft mounted on the bracket. Both the first drive shaft and the second drive shaft are rotatably connected to the bracket. The axis of the first drive shaft is parallel to the axis of the second drive shaft. The motor drives the first drive shaft to rotate.

[0009] The first drive shaft passes through one of the drive wheels of the bracket and is rotatably engaged with it, while the second drive shaft passes through the other drive wheel of the bracket and is fixedly engaged with it.

[0010] The first drive shaft and the second drive shaft are connected by a reduction module, and the two drive wheels of the bracket are connected by a synchronization module.

[0011] In the aforementioned transmission mechanism of the ladder wheelchair, the deceleration module includes a first gear, a second gear, and a first chain. The first gear is fixed on the first transmission shaft, the second gear is fixed on the second transmission shaft, and the first chain drives the first gear and the second gear. The outer diameter of the first gear is smaller than the outer diameter of the second gear.

[0012] In the aforementioned transmission mechanism of the ladder wheelchair, the synchronization module includes a third gear, a fourth gear, and a second chain. The third gear and the fourth gear are respectively disposed on the two drive wheels. The second chain drives and connects the third gear and the fourth gear. The outer diameter of the third gear is the same as the outer diameter of the fourth gear.

[0013] In the aforementioned transmission mechanism of the ladder wheelchair, the support frame is equipped with two walking wheels, and the second transmission shaft is connected to one of the walking wheels of the support frame via a transmission module.

[0014] The chassis is equipped with a first swing mechanism, which is used to adjust the height of the walking wheels.

[0015] In the aforementioned transmission mechanism of the ladder wheelchair, the first swing mechanism includes a first rotating shaft and a first electric push rod. The first rotating shaft passes through the transmission wheel and is coaxial with the transmission wheel. The first rotating shaft is rotatably connected to the bracket. A first sleeve is sleeved on the first rotating shaft and rotatably engages with the first sleeve. The first sleeve is rotatably engaged with the bracket. The transmission wheel is fixed on the first sleeve.

[0016] A first swing block is fixed on the first rotating shaft, and the walking wheel is rotatably disposed at the end of the first swing block away from the first rotating shaft. The rotation axis of the walking wheel is parallel to the axis of the first rotating shaft.

[0017] The first electric push rod is mounted on the bracket and is connected to the first rotating shaft to drive the first rotating shaft to rotate, thereby causing the first swing block to swing.

[0018] In the aforementioned transmission mechanism of the ladder-climbing wheelchair, the transmission module includes a fifth gear, a sixth gear, a seventh gear, an eighth gear, a third chain, and a fourth chain. The fifth gear is fixed on the second transmission shaft, and the sixth and seventh gears are rotatably mounted on the first rotating shaft. The sixth gear is fixedly connected to the seventh gear. A second rotating shaft is rotatably mounted on the first swing block. The walking wheel is fixedly connected to the second rotating shaft, and the eighth gear is fixed on the second rotating shaft. The third chain drives the fifth and sixth gears, and the fourth chain drives the seventh and eighth gears.

[0019] In the aforementioned transmission mechanism of the ladder wheelchair, the track unit includes a swing arm rotatably mounted on the support, a driven wheel rotatably mounted on the swing arm, and a second swing mechanism on the chassis for driving the swing arm to rotate.

[0020] In the aforementioned transmission mechanism of the ladder wheelchair, the swing arm is rotatably mounted on the first sleeve;

[0021] The second swing mechanism includes a second sleeve, a connecting rod, and a second electric push rod. The second sleeve is sleeved on the first rotating shaft and rotatably connected to the first rotating shaft. The connecting rod is disposed on the swing arm. The second sleeve is connected to the connecting rod through a connecting block.

[0022] The second electric push rod is mounted on the bracket and is connected to the second sleeve to drive the second sleeve to rotate, thereby causing the connecting rod to drive the swing arm to swing.

[0023] One of the above-described technical solutions of this utility model has at least one of the following advantages or beneficial effects:

[0024] In this invention, two track units are mounted on a support frame, and two drive shafts are configured for them. The drive wheel of one track unit is rotatably mounted on the drive shaft. Therefore, when the corresponding drive shaft rotates, it does not directly drive the drive wheel to rotate. Instead, it drives the other drive shaft to rotate via a reduction module, and then drives the two drive wheels on the same support frame to rotate via a synchronization module. This allows the two track units to run synchronously, and the two track units do not need to be misaligned. The support tube also only needs to be of the same size. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0026] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model;

[0027] Figure 2This is a side view of the first embodiment of the present invention;

[0028] Figure 3 This is an exploded view of the track unit and support frame according to the first embodiment of this utility model;

[0029] Figure 4 This is an exploded view of the deceleration module and the transmission module of the first embodiment of this utility model;

[0030] Figure 5 This is a cross-sectional view of the structure of the transmission wheel and the first rotating shaft in the first embodiment of this utility model.

[0031] The figure labels for each figure are as follows:

[0032] 1. Chassis; 2. Bracket; 3. Support tube;

[0033] 4. Track unit; 41. Drive sprocket; 42. Transmission sprocket; 43. Driven sprocket; 44. Climbing track; 45. Tensioner; 46. Swing arm;

[0034] 5. Drive unit; 51. Motor; 52. First drive shaft; 53. Second drive shaft; 54. Reduction module; 541. First gear; 542. Second gear; 543. First chain; 55. Synchronization module; 551. Third gear; 552. Fourth gear; 553. Second chain; 56. Transmission module; 561. Fifth gear; 562. Sixth gear; 563. Seventh gear; 564. Eighth gear; 565. Third chain; 566. Fourth chain; 567. Second rotating shaft;

[0035] 6. Wheels;

[0036] 7. First swing mechanism; 71. First rotating shaft; 72. First electric push rod; 73. First sleeve; 74. First swing block; 75. First support;

[0037] 8. Second swing mechanism; 81. Second sleeve; 82. Connecting rod; 83. Second electric push rod; 84. Connecting block; 85. Second support. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] The following disclosure provides many different implementation methods or examples for different solutions to implement this utility model.

[0040] Reference Figures 1 to 5 As shown, a transmission mechanism for a ladder wheelchair includes a chassis 1, which includes two symmetrically arranged supports 2 connected by support tubes 3. Multiple support tubes 3 are provided and supported between the two supports 2 to improve the strength of the chassis 1.

[0041] The support frame 2 is equipped with track units 4 and drive units 5. There are two track units 4 arranged in a front-to-back manner. In this way, the two support frames 2 have four track units 4. When climbing the ladder, the four track units 4 work together to support the chassis 1, which can climb the ladder stably.

[0042] The track unit 4 includes a drive wheel 41, a transmission wheel 42, a driven wheel 43, a ladder track 44, and a tension wheel 45. The ladder track 44 drives the drive wheel 41, the transmission wheel 42, and the driven wheel 43. The two drive wheels 41 on the same support 2 are adjacent, the transmission wheel 42 is located on the side of the drive wheel 41 away from the other drive wheel 41, and the driven wheel 43 is located on the side of the transmission wheel 42 away from the drive wheel 41. The tension wheel 45 is mounted on the support 2 to tension the ladder track 44.

[0043] The bracket 2 includes two plates, and the two plates form an installation space. The drive wheel 41, transmission wheel 42 and tension wheel 45 can be arranged in the installation space. During assembly, the parts can be arranged on one plate first, and then the other plate can be installed, which is convenient for assembly.

[0044] The drive unit 5 includes a motor 51, a first drive shaft 52 and a second drive shaft 53 mounted on the bracket 2. Both the first drive shaft 52 and the second drive shaft 53 are rotatably connected to the bracket 2. The axis of the first drive shaft 52 is parallel to the axis of the second drive shaft 53. The motor 51 drives the first drive shaft 52 to rotate.

[0045] The first drive shaft 52 passes through one of the drive wheels 41 of the bracket 2 and rotates with it, while the second drive shaft 53 passes through the other drive wheel 41 of the bracket 2 and is fixedly engaged with it.

[0046] The first drive shaft 52 and the second drive shaft 53 are connected by a reduction module 54, and the two drive wheels 41 of the bracket 2 are connected by a synchronization module 55.

[0047] The motor 51 drives the first drive shaft 52 to rotate, but it does not directly drive the corresponding drive wheel 41 to rotate. It needs to go through the reduction module 54 to drive the second drive shaft 53, and then the synchronization module 55 makes the two drive wheels 41 rotate synchronously, so as to realize the synchronous operation of the two track units 4. The two track units 4 on the same bracket 2 do not need to be misaligned and can be arranged on the same straight line. In this way, the chassis 1 structure is more compact, and the support tube 3 only needs to be of one size.

[0048] In this embodiment, the deceleration module 54 includes a first gear 541, a second gear 542, and a first chain 543. The first gear 541 is fixed on the first drive shaft 52, the second gear 542 is fixed on the second drive shaft 53, and the first chain 543 drives the first gear 541 and the second gear 542. The outer diameter of the first gear 541 is smaller than the outer diameter of the second gear 542.

[0049] The rotation of the first drive shaft 52 drives the first gear 541 to rotate. The first gear 541 drives the second gear 542 to rotate via the first chain 543. The second gear 542 then drives the second drive shaft 53 to rotate. The outer diameter of the gear is the tip circle diameter of the gear. Therefore, by using the first gear 541 to drive the second gear 542, the rotational speed can be reduced, so that the rotational speed of the second drive shaft 53 is lower than the speed of the first drive shaft 52.

[0050] Synchronization module 55 includes a third gear 551, a fourth gear 552 and a second chain 553. The third gear 551 and the fourth gear 552 are respectively located on two drive wheels 41. The second chain 553 drives and connects the third gear 551 and the fourth gear 552. The outer diameter of the third gear 551 is the same as the outer diameter of the fourth gear 552.

[0051] The second drive shaft 53 drives the drive wheel 41 connected to it to rotate. Relying on the second chain 553, the third gear 551 and the fourth gear 552 rotate synchronously, which in turn makes the other drive wheel 41 rotate. Since the outer diameter of the third gear 551 is the same as that of the fourth gear 552, the speed of the two drive wheels 41 is consistent, ensuring that the two climbing tracks 44 on the same support 2 run at the same speed.

[0052] In this embodiment, the support 2 is provided with two traveling wheels 6, and the two support 2 have a total of four traveling wheels 6. During normal driving, the four traveling wheels 6 work together to support the chassis 1. The four track units 4 correspond one-to-one with the four traveling wheels 6, making the chassis 1 stable enough.

[0053] The second drive shaft 53 is connected to one of the walking wheels 6 of the bracket 2 via a drive module 56.

[0054] The chassis 1 is provided with a first swing mechanism 7, which is used to adjust the height of the walking wheels 6;

[0055] The track unit 4 includes a swing arm 46 rotatably mounted on the bracket 2, a driven wheel 43 rotatably mounted on the swing arm 46, and a second swing mechanism 8 on the chassis 1. The second swing mechanism 8 is used to drive the swing arm 46 to rotate. Therefore, the rotation of the swing arm 46 can adjust the position of the driven wheel 43, thereby changing the posture of the part of the climbing track 44 located between the drive wheel 42 and the driven wheel 43. The lower contact section is used to contact the ground, that is, to contact the step.

[0056] In use, for daily driving, the first swing mechanism 7 lowers the height of the walking wheel 6 so that the walking wheel 6 contacts the ground, and the second swing mechanism 8 retracts the swing arm 46 so that the climbing track 44 does not contact the ground, thus allowing the walking wheel 6 to travel on the ground.

[0057] If it is a ladder, the first swing mechanism 7 raises the height of the walking wheel 6 so that the ladder track 44 contacts the ground. The second swing mechanism 8 adjusts the swing arm 46 so that the contact section can adapt to the slope of the stairs and can contact the edge of the step. The swing arms 46 of the two track units 4 cooperate so that the ladder track 44 can climb the stairs.

[0058] In this embodiment, the first swing mechanism 7 includes a first rotating shaft 71 and a first electric push rod 72. The first rotating shaft 71 passes through the transmission wheel 42 and is coaxial with the transmission wheel 42. The axis of the first rotating shaft 71 is parallel to the axis of the first transmission shaft 52. The first rotating shaft 71 is rotatably connected to the bracket 2. A first sleeve 73 is sleeved on the first rotating shaft 71 and rotatably engages with the first sleeve 73. The first sleeve 73 is rotatably engaged with the bracket 2. The transmission wheel 42 is fixed on the first sleeve 73. Through this structural design, the transmission wheel 42 and the first rotating shaft 71 can rotate independently without interfering with each other.

[0059] A first swing block 74 is fixed on the first rotating shaft 71, and the walking wheel 6 is rotatably disposed at the end of the first swing block 74 away from the first rotating shaft 71. The rotation axis of the walking wheel 6 is parallel to the axis of the first rotating shaft 71.

[0060] The first electric push rod 72 is mounted on the bracket 2, and the first support 75 is fixed on the first rotating shaft 71. One end of the first electric push rod 72 is hinged to the bracket 2, and the other end of the first electric push rod 72 is hinged to the first support 75. When the first electric push rod 72 extends or retracts, it can drive the first rotating shaft 71 to rotate. The rotation of the first rotating shaft 71 can drive the first swing block 74 to swing. The swing of the first swing block 74 can drive the walking wheel 6 to move, thereby adjusting the height of the walking wheel 6.

[0061] In this embodiment, there are two first swing mechanisms 7 on the chassis 1. If the two traveling wheels 6 on the bracket 2 are divided into front wheels and rear wheels, one first swing mechanism 7 is used to control the two front wheels and the other first swing mechanism 7 is used to control the two rear wheels. Therefore, the first rotating shaft 71 will be inserted into the corresponding transmission wheels 42 on the two brackets 2. Both ends of the first rotating shaft 71 are provided with first swing blocks 74, so as to synchronously adjust the two traveling wheels 6.

[0062] Generally, the front wheel is a Mecanum wheel.

[0063] In this embodiment, the swing arm 46 is rotatably mounted on the first sleeve 73;

[0064] The second swing mechanism 8 includes a second sleeve 81, a connecting rod 82, and a second electric push rod 83. The second sleeve 81 is sleeved on the first rotating shaft 71 and rotatably connected to the first rotating shaft 71. Therefore, the first rotating shaft 71 and the second sleeve 81 can rotate independently without interfering with each other. The connecting rod 82 is set on the swing arm 46. Since the swing arm 46 is rotatably set on the first sleeve 73, the rotation axis of the swing arm 46 is coaxial with the rotation axis of the first sleeve 73. The connection between the connecting rod 82 and the swing arm 46 is not located on the rotation axis of the swing arm 46. The second sleeve 81 is connected to the connecting rod 82 through a connecting block 84.

[0065] The second electric push rod 83 is mounted on the bracket 2, and the second support 85 is fixed on the second sleeve 81. One end of the second electric push rod 83 is hinged to the bracket 2, and the other end of the second electric push rod 83 is hinged to the second support 85. The extension and retraction of the second electric push rod 83 drives the second sleeve 81 to rotate. The second sleeve 81 causes the connecting rod 82 to move around it, and the connecting rod 82 then drives the swing arm 46 to swing. The swing axis of the swing arm 46 is also coaxial with the axis of the transmission wheel 42, so the swing of the swing arm 46 will not affect the transmission connection of the climbing ladder track 44.

[0066] In this embodiment, there are two second swing mechanisms 8 on the chassis 1. If the two track units 4 on the support 2 are divided into front track units 4 and rear track units 4, one second swing mechanism 8 controls the swing arms 46 in the two front track units 4, and the other second swing mechanism 8 controls the swing arms 46 in the two rear track units 4. The connecting rod 82 connects the corresponding swing arms 46 on the two supports 2, so that the corresponding two swing arms 46 can swing synchronously.

[0067] In this embodiment, the transmission module 56 includes a fifth gear 561, a sixth gear 562, a seventh gear 563, an eighth gear 564, a third chain 565, and a fourth chain 566. The fifth gear 561 is fixed on the second transmission shaft 53. The sixth gear 562 and the seventh gear 563 are rotatably mounted on the first rotating shaft 71. The sixth gear 562 and the seventh gear 563 are fixedly connected. The first swing block 74 is rotatably mounted on the second rotating shaft 567. The traveling wheel 6 is fixedly connected to the second rotating shaft 567. The eighth gear 564 is fixed on the second rotating shaft 567. The third chain 565 drives the fifth gear 561 and the sixth gear 562. The fourth chain 566 drives the seventh gear 563 and the eighth gear 564.

[0068] Specifically, the rear wheel is connected to the transmission module 56. The sixth gear 562 and the seventh gear 563 are set on the first rotating shaft 71 connected to the rear wheel. The second transmission shaft 53 drives the fifth gear 561 to rotate. The fifth gear 561 drives the sixth gear 562 to rotate through the third chain 565. The sixth gear 562 drives the seventh gear 563 to rotate. The seventh gear 563 drives the eighth gear 564 to rotate through the fourth chain 566. The eighth gear 564 drives the second rotating shaft 567 to rotate. The walking wheel 6 rotates together with the second rotating shaft 567. In this way, even if the walking wheel 6 needs to swing, it will not interfere with the rotation of the walking wheel 6.

[0069] Based on the design of the drive unit 5 in this application, only one motor 51 needs to be arranged on a bracket 2 to enable the two climbing ladder tracks 44 and one walking wheel 6 to run.

[0070] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A transmission mechanism for a ladder-climbing wheelchair, characterized in that, Includes a chassis, the chassis comprising two symmetrically arranged supports connected by a support tube; The support frame is equipped with track units and a drive unit, and there are two track units arranged one in front of the other. The track unit includes a drive wheel, a transmission wheel, a driven wheel, and a ladder track, and the ladder track is drivingly connected to the drive wheel, the transmission wheel, and the driven wheel; The drive unit includes a motor, a first drive shaft, and a second drive shaft mounted on the bracket. Both the first drive shaft and the second drive shaft are rotatably connected to the bracket. The axis of the first drive shaft is parallel to the axis of the second drive shaft. The motor drives the first drive shaft to rotate. The first drive shaft passes through one of the drive wheels of the bracket and is rotatably engaged with it, while the second drive shaft passes through the other drive wheel of the bracket and is fixedly engaged with it. The first drive shaft and the second drive shaft are connected by a reduction module, and the two drive wheels of the bracket are connected by a synchronization module.

2. The transmission mechanism of the ladder wheelchair according to claim 1, characterized in that, The deceleration module includes a first gear, a second gear, and a first chain. The first gear is fixed on the first drive shaft, the second gear is fixed on the second drive shaft, and the first chain drives the first gear and the second gear. The outer diameter of the first gear is smaller than the outer diameter of the second gear.

3. The transmission mechanism of the ladder-climbing wheelchair according to claim 1, characterized in that, The synchronization module includes a third gear, a fourth gear, and a second chain. The third gear and the fourth gear are respectively mounted on two drive wheels. The second chain drives and connects the third gear and the fourth gear. The outer diameter of the third gear is the same as that of the fourth gear.

4. The transmission mechanism of the ladder wheelchair according to claim 1, characterized in that, The bracket is equipped with two wheels, and the second drive shaft is connected to one of the wheels of the bracket through a drive module. The chassis is equipped with a first swing mechanism, which is used to adjust the height of the walking wheels.

5. The transmission mechanism of the ladder wheelchair according to claim 4, characterized in that, The first swing mechanism includes a first rotating shaft and a first electric push rod. The first rotating shaft passes through the transmission wheel and is coaxial with the transmission wheel. The first rotating shaft is rotatably connected to the bracket. A first sleeve is sleeved on the first rotating shaft and rotatably engages with the first sleeve. The first sleeve is rotatably engaged with the bracket. The transmission wheel is fixed on the first sleeve. A first swing block is fixed on the first rotating shaft, and the walking wheel is rotatably disposed at the end of the first swing block away from the first rotating shaft. The rotation axis of the walking wheel is parallel to the axis of the first rotating shaft. The first electric push rod is mounted on the bracket and is connected to the first rotating shaft to drive the first rotating shaft to rotate, thereby causing the first swing block to swing.

6. The transmission mechanism of the ladder wheelchair according to claim 5, characterized in that, The transmission module includes a fifth gear, a sixth gear, a seventh gear, an eighth gear, a third chain, and a fourth chain. The fifth gear is fixed on the second transmission shaft. The sixth and seventh gears are rotatably mounted on the first rotating shaft and are fixedly connected. A second rotating shaft is rotatably mounted on the first swing block. The traveling wheel is fixedly connected to the second rotating shaft. The eighth gear is fixed on the second rotating shaft. The third chain drives the fifth and sixth gears, and the fourth chain drives the seventh and eighth gears.

7. The transmission mechanism of the ladder wheelchair according to claim 5, characterized in that, The track unit includes a swing arm rotatably mounted on the support, a driven wheel rotatably mounted on the swing arm, and a second swing mechanism on the chassis for driving the swing arm to rotate.

8. The transmission mechanism of the ladder wheelchair according to claim 7, characterized in that, The swing arm is rotatably mounted on the first sleeve; The second swing mechanism includes a second sleeve, a connecting rod, and a second electric push rod. The second sleeve is sleeved on the first rotating shaft and rotatably connected to the first rotating shaft. The connecting rod is disposed on the swing arm. The second sleeve is connected to the connecting rod through a connecting block. The second electric push rod is mounted on the bracket and is connected to the second sleeve to drive the second sleeve to rotate, thereby causing the connecting rod to drive the swing arm to swing.

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