An automobile parts production and processing equipment

Abstract

The present invention provides automobile parts production and processing equipment, which relates to the technical field of intelligent automobile parts production, including processing elements and supporting elements, the supporting element including a supporting part arranged above the processing element, a driving part arranged on the supporting part, and a plurality of pneumatic clamps arranged on the supporting part; a resistance element, the resistance element including a plurality of movable parts arranged on the supporting part, a resistance part arranged on the movable part, and two limiting parts arranged on the supporting part and cooperating with the movable part. Through the above technical scheme, its purpose is to rotate the outer shell half a circle, so that the plurality of resistance parts respectively resist the surface of the plate, the movable part is energized, the limiting part limits the movable part, the outer shell rotates half a circle again, and the resistance parts all resist the surface of the outer shell. After the coil is energized, the magnet block and the resistance head move upward, which makes the support for the outer shell more stable, and the magnitude of the upward resistance force of the resistance head on the outer shell is adjusted by adjusting the current in the coil.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent automotive parts production, and particularly to a production and processing device for automotive parts. Background Art

[0002] The material composition of the automotive body shell is rich and diverse. Most of them use metal materials, and also include steel plates, carbon fibers, aluminum, and reinforced plastics, etc. In the processing and forming process of the car body shell, a series of fine operations such as cutting, stamping, and punching are usually required to finally complete the forming process of the car body shell.

[0003] At present, most automotive body shells are in the form of special-shaped thin-shell structures. However, the existing processing equipment has certain limitations. It can only clamp and fix the edge parts of the special-shaped thin car body shell, and it is difficult to provide effective support for the middle area of the thin car body shell. During the cutting process, when the cutting surface of the thin car body shell bears the cutting force, due to the lack of middle support, it is extremely easy to sink and deform downward, which will undoubtedly have an adverse impact on the processing accuracy and quality of the car body shell.

[0004] Most of the existing devices with middle support structures are supported by multiple telescopic rods, and the height of their support is difficult to be intelligently adjusted. If it is automatically adjusted by sensor induction, this support method has a high cost, and it is a rigid support for the automotive body shell. During cutting, it may force the sheet material to fit the fixed position forcibly, conflicting with the original stress state of the sheet material. During the cutting process, stress release causes overall warping and twisting; and for each type of sheet material, the required elastic force for elastic support is different. If the moving range of the support point is too large, its support effect is poor. If the moving range of the support point is too small, it still has the disadvantage of rigid support.

[0005] In view of this, it has become an urgent task to develop a production and processing device for automotive parts that can effectively prevent the car body shell from sinking and deforming. This not only helps to improve the quality and accuracy of car body shell processing, but also can improve production efficiency and meet the growing high-quality production needs of the automotive manufacturing industry. Summary of the Invention

[0006] The purpose of the present invention is to solve the disadvantages in the prior art that the car body shell lacks middle support, is prone to sink and deform during processing, and the moving range of the support point during elastic support is difficult to be intelligently adjusted.

[0007] To achieve the above purpose, the present invention adopts the following technical solution: A production and processing device for automotive parts, including a processing element, the processing element includes a supporting part, a processing part fixedly arranged above the supporting part, and a cutting part arranged on the processing part;

[0008] A supporting element, the supporting element comprising a supporting portion disposed above the processing element, a driving portion disposed on the supporting portion, and a plurality of pneumatic clamps disposed on the supporting portion;

[0009] a resisting element, the resisting element comprising a plurality of movable portions provided on the supporting portion, a resisting portion provided on the movable portion, and two limiting portions provided on the supporting portion and cooperating with the movable portion;

[0010] The pneumatic clamp clamps the plate, the driving part drives the plate to rotate half a circle, and several of the resistance parts respectively press against the surface of the plate according to the shape of the plate; the movable part is energized, the limiting part limits the movable part, and the resistance parts press against the surface of the plate. The plate rotates half a circle again, and the resistance parts all press against the surface of the plate. The current passing through the movable part is changed, and the resistance force of the resistance parts is adjusted.

[0011] In at least some embodiments, the support portion includes a support plate, a plurality of sliding holes provided through the support plate, a plurality of connecting plates fixedly provided on the side walls of the support plate, a support plate provided below the support plate and fixedly connected to the support plate through the connecting plates, support legs provided on both sides of the support plate, and the pneumatic clamps are respectively provided on the upper walls of the connecting plates.

[0012] In at least some embodiments, the movable part includes an iron core slidably arranged in the sliding hole, a plurality of limiting grooves provided through the iron core, a coil wound around the outer wall of the lower end of the iron core, and a fixed plate fixedly provided on the upper end of the iron core. The limiting grooves are arranged vertically and evenly, and a plurality of the coils are connected in series in sequence and connected to an external power supply. The current in the coils flows in the same direction.

[0013] In at least some embodiments, the interference portion includes a moving rod passing through the iron core, a magnet block fixedly disposed on the upper end of the moving rod, and an interference head disposed on the magnet block, wherein the magnet block is elastically connected to the fixed plate via an upper spring.

[0014] In at least some embodiments, the limiting portion includes a movable groove arranged in the supporting plate, a horizontal plate fixedly arranged in the movable groove, and a magnet sheet slidably arranged in the movable groove, and the magnet sheet and the limiting groove are arranged in coordination.

[0015] In at least some embodiments, the limiting portion further includes a telescopic rod disposed between the horizontal plate and the magnet sheet, and the two magnet sheets have the same magnetic poles on one side close to the iron core and opposite magnetic poles to the end of the magnet block close to the iron core.

[0016] In at least some embodiments, the processing element includes a supporting portion, a processing portion fixedly arranged above the supporting portion, the supporting portion includes a base arranged below the supporting plate, two linear modules fixedly arranged on the base, and a slider slidably arranged on the linear module, and the sliders are respectively fixedly connected to the support legs.

[0017] In at least some embodiments, the processing portion includes a gantry fixedly mounted on the upper wall of the base, and a processing mechanism disposed on the gantry, wherein the processing mechanism is located above the supporting plate.

[0018] In at least some embodiments, the cutting portion includes a cutting blade disposed below the processing mechanism and a sensor disposed on the processing mechanism.

[0019] In at least some embodiments, the driving portion includes a rotating rod fixedly provided on both side walls of the support plate, one rotating rod passing through the support leg and rotatably connected thereto, a main gear fixedly provided on the rotating rod, a driving rod passing through the side wall of the support leg and rotatably connected thereto, a secondary gear fixedly provided on the driving rod and meshing with the main gear, and a motor fixedly provided on the side wall of the support leg and driving the driving rod to rotate.

[0020] Compared with the prior art, the advantages and positive effects of the present invention are:

[0021] In the present invention, the automobile shell is clamped by a pneumatic clamp, and the driving part drives the shell to rotate half a circle. Several resistance parts are respectively pressed against the surface of the plate according to the shape of the shell. The movable part is energized, and the limiting part limits the movable part. The shell rotates half a circle again, and the resistance parts are all pressed against the shell surface to support the middle part of the shell for subsequent shell processing. Compared with traditional devices, this device supports the middle part of the shell to prevent concave deformation during the processing of the car shell.

[0022] In the present invention, by connecting the coils in series, all the interference parts are limited after power is applied, and the limit is released after reverse power is applied, thereby achieving stable and rapid support of the middle part of the shell. By controlling the direction of the current in the coil, the support and release of the middle part of the shell are achieved, thereby improving the efficiency and intelligence of the device.

[0023] In the present invention, after the coil is energized, the magnet block and the contact head move upward, and the support for the shell is more stable. By adjusting the current in the coil, the magnetic force of the iron core is adjusted, thereby adjusting the upward resistance force of the contact head on the shell. The elastic supporting force is adjusted according to the physical properties of the shell. Compared with traditional devices, the applicability of the device is improved by intelligently changing the elastic supporting force. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1The present invention provides a schematic diagram of the overall structure of an automobile parts production and processing equipment from a first perspective;

[0025] Figure 2 This invention proposes a schematic diagram of the structure of supporting elements and interference elements from a first perspective of an automobile parts production and processing equipment;

[0026] Figure 3 The present invention provides a second perspective overall structural diagram of an automobile parts production and processing equipment;

[0027] Figure 4 A schematic diagram of the structure of the supporting element and the interfering element from a second perspective of an automobile parts production and processing equipment proposed by the present invention;

[0028] Figure 5 The present invention provides a schematic diagram of the coordinated working of the movable part and the interference part of an automobile parts production and processing equipment;

[0029] Figure 6 The present invention provides a cross-sectional view of the coordinated working of the movable part and the conflicting part of an automobile parts production and processing equipment;

[0030] Figure 7 The present invention proposes a kind of automobile parts production and processing equipment Figure 6 A magnified schematic diagram of the structure in the middle.

[0031] Legend: 1. Processing element; 11. Supporting part; 111. Base; 112. Slider; 113. Linear module; 12. Processing part; 121. Gantry; 122. Processing mechanism; 13. Cutting part; 131. Cutting blade; 132. Sensor; 2. Supporting element; 21. Supporting part; 211. Support plate; 212. Connecting plate; 213. Supporting plate; 214. Support leg; 215. Sliding hole; 22. Driving part; 221. Rotating rod; 2 22. Main gear; 223. Secondary gear; 224. Driving rod; 225. Motor; 23. Pneumatic clamp; 3. Interference element; 31. Movable part; 32. Interference part; 33. Limiting part; 311. Iron core; 312. Limiting groove; 313. Coil; 314. Fixed plate; 321. Interference head; 322. Magnet block; 323. Moving rod; 324. Upper spring; 331. Moving groove; 332. Horizontal plate; 333. Magnet sheet; 334. Telescopic rod. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0033] In the following description, many specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention may be practiced in other ways different from those described herein. Therefore, the present invention is not limited by the limitations of the specific embodiments disclosed in the following specification.

[0034] As Figures 1 to 7 shown, a production and processing device for automobile parts provided by an embodiment of the present invention, as Figure 1 and Figure 3 shown, includes a processing element 1. The processing element 1 includes a supporting portion 11. The supporting portion 11 includes a base 111, two linear modules 113 fixedly arranged on the base 111, and sliders 112 slidably arranged on the linear modules 113. Among them, the linear module 113 is a mechanical device that can provide linear motion, which is a common and mature technology. In this invention, it is used to adjust the position of the automobile shell to facilitate subsequent processing.

[0035] Above the supporting portion 11, a processing portion 12 is fixedly arranged. The processing portion 12 includes a gantry 121 fixedly arranged on the upper wall of the base 111, a processing mechanism 122 arranged on the gantry 121, and the processing mechanism 122 is located on the supporting plate 213. Among them, the processing mechanism 122 is a position-adjustable mechanism used for processing the automobile shell, which is a common device for automobile parts production.

[0036] Above the processing portion 121, a cutting portion 13 is arranged. The cutting portion 13 includes a cutting blade 131 arranged below the processing mechanism 122 and a sensor 132 arranged on the processing mechanism 122. Among them, the cutting blade 131 is used for cutting the automobile shell, and the sensor 132 is used to transmit the position of the cutting blade 131 to an external control mechanism.

[0037] Above the supporting portion 11, a supporting element 2 is arranged. The supporting element 2 includes a supporting portion 21 of the processing element 1. The supporting portion 21 includes a supporting plate 213, a plurality of sliding holes 215 penetrating the supporting plate 213, a plurality of connecting plates 212 fixedly arranged on the side wall of the supporting plate 213, a supporting plate 211 arranged below the supporting plate 213 and fixedly connected thereto through the connecting plates 212, supporting legs 214 arranged on both sides of the supporting plate 211, and pneumatic clamps 23 arranged on the upper wall of the connecting plates 212. Among them, the supporting legs 214 are respectively fixedly connected to the sliders 112. The pneumatic clamp 23 is a clamping device that uses compressed air as a power source to realize the functions of clamping and loosening the workpiece. Here, the angle of the pneumatic clamp 23 can be adjusted to meet the clamping of the special-shaped automobile shell, and the follow-up clamping can use existing mature technologies.

[0038] A driving part 22 is provided on the support part 21, and the driving part 22 includes a rotating rod 221 fixedly provided on both side walls of the support plate 211, one rotating rod 221 is provided through the support leg 214 and is rotatably connected thereto, a main gear 222 is fixedly provided on the rotating rod 221, and the driving part 22 also includes a driving rod 224 that is provided through the side wall of the support leg 214 and is rotatably connected thereto, a secondary gear 223 fixedly provided on the driving rod 224 and meshing with the main gear 222, and a motor 225 fixedly provided on the side wall of the support leg 214 and driving the driving rod 224 to rotate; wherein the motor 225 drives the driving rod 224 to rotate, and through the meshing action of the main gear 222 and the secondary gear 223, drives the rotating rod 221 to rotate, that is, the support plate 211 rotates.

[0039] A resistance element 3 is provided on the support portion 21. The resistance element 3 includes a plurality of movable portions 31 provided on the support portion 21. The movable portion 31 includes an iron core 311 slidably provided in the sliding hole 215, a plurality of limiting grooves 312 provided through the iron core 311, a coil 313 wound around the outer wall of the iron core 311, and a fixing plate 314 fixedly provided on the upper end of the iron core 311. The limiting grooves 312 are arranged vertically and evenly. The plurality of coils 313 are connected in series in sequence and connected to an external power supply. The current in the coils 313 flows in the same direction, so that the north and south poles of each iron core 311 are consistent, which facilitates intelligent unified control.

[0040] Among them, the coil 313 has a certain elasticity to adapt to the movement of the iron core 311. When the coil 313 is energized, since the coil 313 is wound around the outer wall of the iron core 311, the iron core 311 generates magnetism. When the coil 313 is energized, the part of the iron core 311 not wound by the coil 313 also becomes magnetic. The magnetic lines of force of the magnetic field generated by the energized coil 313 pass through the iron core 311 to form a closed loop. Since the magnetic permeability of the iron core 311 is much greater than that of the surrounding air, the magnetic lines of force will be concentrated in the iron core 311. Even the part of the iron core 311 not wound by the coil 313 will have magnetic lines of force passing through, thereby magnetizing this part of the iron core 311 and making it magnetic.

[0041] When the locking cam 324 is in the unlock position, the locking cam 321 is in the unlock position, and the locking cam 322 is in the unlock position, so that the locking cam 321 is locked.

[0042] An electric push rod is provided inside the magnet block 322, and the front end of the electric push rod is threadedly connected to the lower end of the contact head 321. After the sensor 132 transmits the position of the cutting blade 131 to the external control mechanism, the electric push rod at the cutting position contracts, so that the contact head 321 below the cutting position is retracted into the magnet block 322, avoiding damage to the contact head 321 during cutting. The contact heads 321 at other positions are still supported by the car shell.

[0043] Two limiting parts 33 are provided on the support part 21, and the limiting part 33 includes a movable groove 331 provided in the supporting plate 213, a horizontal plate 332 fixedly provided in the movable groove 331, and a magnet piece 333 slidably provided in the movable groove 331, and the magnet piece 333 and the limiting groove 312 are cooperated with each other; when the iron core 311 generates magnetism, the magnet piece 333 is attracted and inserted into the movable groove 331 due to the action of magnetic force; even if the magnet piece 333 is magnetically attracted and only adheres to the outer wall of the iron core 311, when the supporting plate 213 is rotated to the front, due to the action of gravity and centrifugal force, the magnet piece 333 adheres to the outer wall of the iron core 311 and moves relative to it. During this process, the magnet piece 333 is inserted into the limiting groove 312.

[0044] Among them, the iron core 311 is made of soft magnetic materials, such as silicon steel, pure iron, etc. These materials are not magnetic themselves when not magnetized, and will not produce magnetic effects with nearby magnets. Even if there is a magnetic field of the magnet piece 333 around it, the iron core 311 will not be magnetized to a degree that can generate an attractive force sufficient to move the magnet piece 333; the groove wall of the movable groove 331 is coated with a coating to increase its friction coefficient so that the magnet piece 333 will not separate from the movable groove 331 due to centrifugal force or gravity.

[0045] The limiting part 33 further includes a telescopic rod 334 disposed between the cross plate 332 and the magnet sheet 333. The magnetic poles on the side of the two magnet sheets 333 close to the iron core 311 are the same, and are opposite to the magnetic pole at the end of the magnet block 322 close to the iron core 311. When not attracted by the magnetic force of the iron core 311, the cross plate 332 is always located within the moving groove 331.

[0046] If the magnetic pole on the side of the magnet sheet 333 close to the iron core 311 is the positive pole, then the end of the magnet block 322 close to the iron core 311 is the negative pole. When the coil 313 is energized in the forward direction, the upper end of the iron core 311 is the negative pole, attracting the magnet sheet 333 to move until it is inserted into the limiting groove 312 for limiting. At this time, the lower end of the magnet block 322 and the upper end of the iron core 311 are both the negative pole. Due to the repulsion between like poles, the magnet block 322 and the contact head 321 move upward, further pressing tightly against the car shell. By adjusting the magnitude of the current in the coil 313, the contact force of the contact head 321 against the car shell can be adjusted. When disassembly is required, the coil 313 is energized in the reverse direction. At this time, the upper end of the iron core 311 is the positive pole. Due to the repulsion between like poles, the magnet sheet 333 moves and slides into the moving groove 331, releasing the limit of the magnet sheet 333 on the iron core 311. Among them, the switching of the current direction in the coil 313 can be achieved through a double-pole double-throw switch, an H-bridge circuit, or a relay. The switching of the current direction of direct current is a mature existing technology and will not be elaborated here.

[0047] During actual use, first clamp the car shell with the pneumatic fixture 23, start the motor 225, drive the driving rod 224 to rotate, and drive the rotating rod 221 to rotate through the meshing of the main gear 222 and the secondary gear 223 until the support plate 211 and the car shell rotate half a circle.

[0048] Due to the action of gravity, several contact heads 321 respectively abut against the surface of the car shell according to the shape of the shell. At this time, the coil 313 is energized, the iron core 311 generates magnetism, the magnet sheet 333 is magnetically attracted and adheres to the outer wall of the iron core 311. At this time, the magnet block 322 has the same polarity as the upper end of the iron core 311, and the contact head 321 moves to further abut against the car shell.

[0049] Start the motor 225 to make the support plate 211 and the car shell rotate another half a circle to the front. Due to the action of gravity and centrifugal force, the magnet sheet 333 adheres to the outer wall of the iron core 311 and undergoes relative movement. During the movement, the magnet sheet 333 is inserted into the upper or lower limiting groove 312 closest to it to limit the movement of the iron core 311. At this time, due to the setting of the upper spring 324 and the magnet block 322, the contact head 321 still abuts against the surface of the shell. By adjusting the magnitude of the current in the coil 313, the position of the magnet block 322 can be adjusted, that is, the contact force of the contact head 321 can be adjusted according to the shell material to support the middle part of the shell. The subsequent processing of the shell is carried out through the cooperation of the cutting piece 131 and the sensor 132.

[0050] When disassembly is required, the direction of the current in the coil 313 is changed. At this time, the iron core 311 and one end of the magnet piece 333 close to it repel each other with the same polarity, and the magnet piece 333 moves and slides into the moving groove 331, thereby releasing the limitation of the magnet piece 333 on the iron core 311.

[0051] By controlling the direction of the current in the coil 313, the device realizes the support and release of the support in the middle of the outer shell, improving the efficiency and intelligence of the device; by adjusting the magnitude of the current in the coil 313, the magnetic force of the iron core 311 is adjusted, thereby adjusting the magnitude of the upward contact force of the contact head 321 on the outer shell, and adjusting the elastic support force according to the physical characteristics of the outer shell, intelligently changing the elastic support force, and improving the applicability of the device.

[0052] The above is only the preferred embodiment of the present invention, and it is not a limitation of the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. An automobile parts production and processing device, characterized in that: The processing element (1) comprises a supporting portion (11), a processing portion (12) fixedly arranged above the supporting portion (11), and a cutting portion (13) arranged on the processing portion (12); A supporting element (2), the supporting element (2) comprising a supporting portion (21) disposed above the processing element (1), a driving portion (22) disposed on the supporting portion (21), and a plurality of pneumatic clamps (23) disposed on the supporting portion (21); A resisting element (3), the resisting element (3) comprising a plurality of movable portions (31) disposed on the supporting portion (21), a resisting portion (32) disposed on the movable portion (31), and two limiting portions (33) disposed on the supporting portion (21) and cooperating with the movable portion (31); The pneumatic clamp (23) clamps the plate, the driving part (22) drives the plate to rotate half a circle, and a plurality of the resisting parts (32) respectively resist the surface of the plate according to the shape of the plate; the movable part (31) is energized, the limiting part (33) limits the movable part (31), and the resisting parts (32) are pressed against the surface of the plate. The plate rotates half a circle again, and the resisting parts (32) all resist the surface of the plate, thereby changing the current passing through the movable part (31) and adjusting the resistance force of the resisting parts (32).

2. The automotive parts production and processing equipment according to claim 1, characterized in that: The support portion (21) includes a supporting plate (213), a plurality of sliding holes (215) provided through the supporting plate (213), a plurality of connecting plates (212) fixedly provided on the side walls of the supporting plate (213), a supporting plate (211) provided below the supporting plate (213) and fixedly connected to the supporting plate (213) via the connecting plates (212), supporting legs (214) provided on both sides of the supporting plate (211), and the pneumatic clamps (23) are respectively provided on the upper walls of the connecting plates (212).

3. The automotive parts production and processing equipment according to claim 2, characterized in that: The movable portion (31) includes an iron core (311) slidably arranged in the sliding hole (215), a plurality of limiting grooves (312) penetrating the iron core (311), a coil (313) wound around the outer wall of the lower end of the iron core (311), and a fixing plate (314) fixedly arranged at the upper end of the iron core (311). The limiting grooves (312) are arranged evenly in a vertical direction. A plurality of the coils (313) are sequentially connected in series and connected to an external power supply. The current in the coils (313) flows in the same direction.

4. The automotive parts production and processing equipment according to claim 3, characterized in that: The abutment portion (32) includes a moving rod (323) passing through the iron core (311), a magnet block (322) fixedly disposed on the upper end of the moving rod (323), and a abutment head (321) disposed on the magnet block (322). The magnet block (322) is elastically connected to the fixing plate (314) via an upper spring (324).

5. The automotive parts production and processing equipment according to claim 4, characterized in that: The limiting part (33) includes a moving groove (331) arranged in the supporting plate (213), a cross plate (332) fixedly arranged in the moving groove (331), and a magnet sheet (333) slidably arranged in the moving groove (331). The magnet sheet (333) is arranged in cooperation with the limiting groove (312).

6. The automotive parts production and processing equipment according to claim 5, characterized in that: The limiting part (33) further includes a telescopic rod (334) arranged between the cross plate (332) and the magnet sheet (333). The magnetic poles on one side of the two magnet sheets (333) close to the iron core (311) are the same, and are opposite to the magnetic poles at one end of the magnet block (322) close to the iron core (311).

7. The automotive parts production and processing equipment according to claim 2, characterized in that: The supporting part (11) includes a base (111) arranged below the supporting plate (213), two linear modules (113) fixedly arranged on the base (111), and sliders (112) slidably arranged on the linear modules (113). The sliders (112) are fixedly connected to the supporting legs (214) respectively.

8. The automotive parts production and processing equipment according to claim 7, characterized in that: The processing part (12) includes a gantry (121) fixedly arranged on the upper wall of the base (111), and a processing mechanism (122) arranged on the gantry (121). The processing mechanism (122) is located above the supporting plate (213).

9. The automotive parts production and processing equipment according to claim 8, characterized in that: The cutting part (13) includes a cutting blade (131) arranged below the processing mechanism (122), and a sensor (132) arranged on the processing mechanism (122).

10. The automotive parts production and processing equipment according to claim 2, characterized in that: The driving part (22) includes rotating rods (221) fixedly arranged on both side walls of the supporting plate (211). One rotating rod (221) penetrates through the supporting leg (214) and is rotatably connected thereto. A main gear (222) is fixedly arranged on the rotating rod (221). A driving rod (224) penetrates through the side wall of the supporting leg (214) and is rotatably connected thereto. A secondary gear (223) is fixedly arranged on the driving rod (224) and meshes with the main gear (222). A motor (225) is fixedly arranged on the side wall of the supporting leg (214) and drives the driving rod (224) to rotate.

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