Welding forming device for automobile parts

Abstract

The invention relates to the technical field of welding devices, and discloses an automobile part welding forming device which comprises a base, a deck plate is fixedly connected to the top of the base, a clamping mechanism is arranged at the top of the deck plate, a limiting mechanism is further arranged at the top of the deck plate, and a turning mechanism is arranged in the deck plate. A backup plate is fixedly connected to the top of the table top plate, a plurality of ventilation grooves are formed in the surface of the table top plate, an effective supporting face can be provided for the complex geometrical shapes of specific automobile parts so that clamping can be conducted, the number of clamping points on the surfaces of workpieces can be increased through a plurality of telescopic pressing rods, and the clamping stability is greatly improved; and the flexibility of the device is further improved through an adjusting knob, so that clamping parts are adjusted according to different welding parts on the workpiece, and blocking is prevented.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, specifically to a welding and forming device for automotive parts. Background Technology

[0002] The welding and forming equipment for automotive parts is a core piece of equipment in automobile manufacturing. It involves a variety of advanced welding technologies and is developing towards automation and intelligence. Such equipment can typically connect and fix metal or non-metal parts and is a specialized welding equipment and auxiliary system.

[0003] Patent CN213646458U discloses a welding device for new energy vehicle parts, including a fixed plate. An L-shaped support plate is fixedly connected to the left rear side of the upper surface of the fixed plate. A limit plate is fixedly connected to the upper surface of the L-shaped support plate. A slider is slidably arranged on the inner side of the middle part of the sliding groove. A connecting plate is fixedly connected between two sets of sliders. A connecting block is fixedly connected to the middle part of the upper surface of the connecting plate. This welding device for new energy vehicle parts, through the cooperation of a servo motor, rotating shaft, pulley, transmission belt, connecting block, connecting plate, placement plate, and hydraulic cylinder, can adjust the position of the welding part body, making it easier to weld automotive parts. Through the cooperation of a fixed clamping plate, moving clamping plate, sliding block, sliding hole, translation plate, elastic spring, inclined plate, and limit block, the automotive parts can be better fixed.

[0004] However, the aforementioned devices are difficult to provide an effective support surface for specific automotive parts with complex geometries, which may result in low clamping stability. Consequently, the workpiece may shift due to external forces or thermal deformation during the welding process, affecting its welding quality. Therefore, a welding and forming device for automotive parts is proposed to solve the aforementioned problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a welding and forming apparatus for automotive parts, which addresses the shortcomings of the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a welding and forming device for automotive parts, including a base, a platform fixedly connected to the top of the base, a clamping mechanism and a limiting mechanism on the top of the platform, a flipping mechanism inside the platform, a backing plate fixedly connected to the top of the platform, and multiple ventilation grooves on the surface of the platform. The clamping mechanism includes: a connecting shaft, a fixing block, a gear, a lower rack, an adjusting knob, an upper rack, a connecting arm, a pressure rod, a pressure spring, a belt, and a foot pad. The fixing block is fixedly connected to the top of the platform, the connecting shaft is rotatably connected to the inner wall of the fixing block, the gear is fixedly connected to both ends of the connecting shaft, the connecting arm is slidably connected to the circumferential surface of the connecting shaft, the lower rack is fixedly connected to the rear part of the left connecting arm, and the upper rack is fixedly connected to the rear part of the right connecting arm. The adjusting knob engages with the teeth between the lower and upper racks. The pressure rod is slidably connected to the inner wall of the connecting arm. One end of the pressure spring is fixedly connected to the rear of the connecting arm, and the other end is fixedly connected to the rear end of the pressure rod. The foot pad is fixedly connected to the front end of the pressure rod. The belt is fixedly connected between each pressure rod. The pressure spring is located on the circumferential surface of the pressure rod. A keyway is provided on the inner wall of the connecting arm. A flat key is installed on the circumferential surface of the connecting shaft for synchronous rotation of the connecting arm and the connecting shaft. The connecting shaft is driven by an external motor. It can provide an effective support surface for clamping specific automotive parts with complex geometry. The number of clamping points on the workpiece surface is increased by multiple retractable pressure rods, greatly increasing the clamping stability. The adjusting knob further enhances the flexibility of the device to adjust the clamping points for different welding parts on the workpiece and prevents obstruction.

[0007] Preferably, the limiting mechanism includes: a sliding bar, a connecting seat, a mounting plate, a hand-tightening nut, a push plate, and a second pressure spring. The sliding bar is slidably connected to the top of the table panel, the connecting seat is fixedly connected to the front surface of the sliding bar, the mounting plate is fixedly connected to the top of the connecting seat, the hand-tightening nut is threadedly connected to the top of the mounting plate, the push plate is slidably connected to the rear of the mounting plate, and the second pressure spring is installed between the push plate and the mounting plate. The limiting mechanism also includes: a protrusion, an arc-shaped baffle, a bearing seat, a lever, an elastic telescopic rod, and a pressure plate. The protrusion is fixedly connected to the left and right sides of the connecting seat, the bearing seat is fixedly connected to the top of the table panel, the arc-shaped baffle is fixedly connected to the inner wall rotating rod surface of the bearing seat, the lever is fixedly connected to the inner wall rotating rod surface of the bearing seat and is symmetrical to the arc-shaped baffle, and the elastic telescopic rod... The lever is rotatably connected to the end away from the bearing seat, and the pressure plate is rotatably connected to the end of the lever away from the bearing seat. The other end of the elastic telescopic rod is rotatably connected to the back of the pressure plate. The top of the sliding bar away from the fixed block is provided with a rack, and the rack at the top of the sliding bar meshes with a gear. The bottom of the sliding bar is provided with a rack of a different specification than the top. The hand-tightening nut is located at the connection point between the push plate and the mounting plate and is used to fasten the push plate. The front of the pressure plate is provided with an anti-slip groove. The arc-shaped baffle is located on the movement trajectory of the protrusion. The workpiece is clamped by the reset force of the pressure spring. During the welding process, the parts are fixed to prevent them from moving due to thermal deformation and the pressure of the welding gun. The pressure plate can also provide lateral clamping force to the workpiece, further improving the stability and safety of the welding process, so as to improve the welding quality.

[0008] Preferably, the flipping mechanism includes: a second gear, a rotating rod, and a lever. The rotating rod is rotatably connected to the inner wall of the table panel, the second gear is fixedly connected to both ends of the rotating rod, and the lever is fixedly connected to the circumferential surface of the rotating rod. The flipping mechanism also includes: a limiting rod, a fork tooth, and a semi-circular push rod. The limiting rod is fixedly connected to the top of the table panel, the fork tooth is movably connected to the circumferential surface of the limiting rod, and the semi-circular push rod is slidably connected to the inner wall of the top of the table panel. The semi-circular push rod is driven to rise and fall by a hydraulic telescopic rod at the bottom of the table panel. A limiting groove is formed on the circumferential surface of the limiting rod, and the limiting groove consists of a threaded groove and a straight groove. Each lever is located on the table panel. Inside the ventilation groove, the workpiece undergoes high-frequency micro-plastic deformation through repeated tapping by rotating paddles. This promotes the redistribution and partial release of residual stress within the workpiece, thereby reducing stress concentration and minimizing deformation or cracking caused by uneven residual stress generated within the workpiece due to localized high temperatures and cooling during welding. The fork teeth lift the high-temperature workpiece, facilitating hoisting and removal by operators. Once removed from the welding station, the workpiece can immediately proceed to the next process, avoiding production delays caused by waiting for natural cooling. Prolonged contact between the device and high-temperature workpieces can lead to thermal fatigue, oxidation, or deformation of the materials in various components. The automatic lifting of the workpiece by the fork teeth shortens the contact time between the fixture and the high temperature, extending its service life.

[0009] The present invention, by adopting the above technical solution, can bring the following beneficial effects: 1. The welding and forming device for automotive parts can provide an effective support surface for clamping specific automotive parts with complex geometry. It also increases the number of clamping points on the workpiece surface by using multiple telescopic pressure rods, which greatly increases the clamping stability. The device's flexibility can be further enhanced by adjusting the knob to adjust the clamping points for different welding parts on the workpiece, preventing obstruction.

[0010] 2. The welding forming device for this automotive parts clamps the workpiece by the force of the pressure spring resetting, fixing the parts during the welding process and preventing them from moving due to thermal deformation and the pressure of the welding gun. The pressure plate can also provide lateral clamping force to the workpiece, further improving the stability and safety of the welding process, thereby improving the welding quality.

[0011] 3. The welding and forming device for this automotive part uses a rotating paddle to repeatedly strike the workpiece, causing high-frequency micro-plastic deformation. This redistributes and partially releases residual stress within the workpiece, thereby reducing stress concentration and minimizing deformation or cracking caused by uneven residual stress generated inside the workpiece due to localized high temperatures and cooling during the welding process.

[0012] 4. The welding and forming device for automotive parts uses forks to lift high-temperature workpieces, making it convenient for operators to hoist and collect them and remove them. After the workpieces are removed from the welding station, they can immediately proceed to the next process, avoiding delays in production due to waiting for natural cooling. Long-term contact between the device and high-temperature workpieces can cause thermal fatigue, oxidation, or deformation of the materials of various components on the device. The automatic lifting of the workpieces by the forks can shorten the contact time between the fixtures and high temperatures and extend their service life. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall clamping mechanism of the present invention; Figure 3 This is a partial enlarged view of the clamping mechanism of the present invention; Figure 4 This is a partial schematic diagram of the limiting mechanism of the present invention; Figure 5 This is a schematic diagram of the installation location of the push plate structure of the present invention; Figure 6 This is a schematic diagram of the overall limiting mechanism of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of the structure at point A in the middle; Figure 8 This is a cross-sectional view of the flipping mechanism of the present invention; Figure 9 For the present invention Figure 8 Enlarged view of the structure at point B in the middle; Figure 10 This is an enlarged view of the rotating rod structure of the present invention; Figure 11 This is an enlarged view of the fork tooth structure of the present invention; Figure 12 This is an enlarged view of the semi-circular push rod structure of the present invention.

[0014] In the diagram: 1. Base; 2. Tabletop; 3. Clamping mechanism; 301. Connecting shaft; 302. Fixing block; 303. Gear 1; 304. Lower rack; 305. Adjustment knob; 306. Upper rack; 307. Connecting arm; 308. Pressure rod; 309. Pressure spring 1; 310. Belt; 311. Foot pad; 4. Limiting mechanism; 401. Sliding bar; 402. Connecting seat; 403. Mounting plate; 404, hand-tightening nut; 405, push plate; 406, pressure spring II; 407, protrusion; 408, arc-shaped baffle; 409, bearing seat; 410, lever; 411, elastic telescopic rod; 412, pressure plate; 5, flipping mechanism; 501, gear II; 502, rotating rod; 503, lever; 504, limit rod; 505, fork tooth; 506, semi-circular push rod; 6, backing plate. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Please see Figures 1-12 One embodiment of the present invention is: a welding and forming device for automotive parts, including a base 1, a table 2 fixedly connected to the top of the base 1, a clamping mechanism 3 provided on the top of the table 2, a limiting mechanism 4 also provided on the top of the table 2, a flipping mechanism 5 provided inside the table 2, a backing plate 6 fixedly connected to the top of the table 2, and multiple ventilation grooves formed on the surface of the table 2. The clamping mechanism 3 includes: a connecting shaft 301, a fixing block 302, a gear 303, a lower rack 304, an adjusting knob 305, an upper rack 306, a connecting arm 307, and a pressure... Rod 308, pressure spring 309, belt 310, foot pad 311, and fixing block 302 are fixedly connected to the top of the platform 2. Connecting shaft 301 is rotatably connected to the inner wall of fixing block 302. Gear 303 is fixedly connected to both ends of connecting shaft 301. Connecting arm 307 is slidably connected to the circumferential surface of connecting shaft 301. Lower rack 304 is fixedly connected to the rear of left connecting arm 307. Upper rack 306 is fixedly connected to the rear of right connecting arm 307. Adjusting knob 305 is engaged at the teeth between lower rack 304 and upper rack 306. Pressure rod 308 A sliding connection is made to the inner wall of the connecting arm 307. One end of the pressure spring 309 is fixedly connected to the rear of the connecting arm 307, and the other end of the pressure spring 309 is fixedly connected to the rear end of the pressure rod 308. A foot pad 311 is fixedly connected to the front end of the pressure rod 308. A belt 310 is fixedly connected between each pressure rod 308. The pressure spring 309 is located on the circumferential surface of the pressure rod 308. A keyway is provided on the inner wall of the connecting arm 307. A flat key is installed on the circumferential surface of the connecting shaft 301 for synchronous rotation of the connecting arm 307 and the connecting shaft 301. The connecting shaft 301 is driven by an external motor. The design provides an effective support surface for clamping specific automotive parts with complex geometries. Multiple telescopic pressure rods 308 increase the number of clamping points on the workpiece surface, greatly enhancing clamping stability. When the distance between the two connecting arms 307 needs to be changed, rotating the adjustment knob 305 clockwise drives the lower rack 304 on the left to move to the right and the upper rack 306 on the right to move to the left, causing the two connecting arms 307 to move closer to each other, further improving the flexibility of the device to adjust the clamping position for different welding parts on the workpiece and preventing obstruction. Working Principle: When the device is in operation and welding of automotive parts is required, the worker places the workpiece to be welded onto the device surface. At this time, the connecting shaft 301, driven by an external motor, begins to rotate. The rotation of the connecting shaft 301 drives the connecting arm 307 to rotate. The rotation of the connecting arm 307 causes the foot pad 311 at the front end of the pressure rod 308 to contact and compress the workpiece. As the connecting arm 307 continues to rotate, the pressure rod 308 is blocked by the workpiece, stretching the pressure spring 309. When the set pressure is reached, the connecting shaft 301 stops rotating. When dealing with workpieces with irregular surface shapes and large height differences, the compression lengths of each pressure rod 308 are different, and they may not be able to contact the workpiece. In this case, the belts between the pressure rods 308... 310 will still contact and compress the workpiece, effectively clamping it by increasing the support surface. This design can provide an effective support surface for clamping the complex geometry of specific automotive parts, and the number of clamping points on the workpiece surface is greatly increased by multiple telescopic pressure rods 308, which greatly increases the clamping stability. When it is necessary to change the distance between the two connecting arms 307, turning the adjustment knob 305 clockwise will drive the lower rack 304 on the left to move to the right and the upper rack 306 on the right to move to the left, causing the two connecting arms 307 to move closer to each other, further improving the flexibility of the device to adjust the clamping position for different welding parts on the workpiece and preventing obstruction.

[0017] Please see Figures 1-12Based on the above embodiments, in another embodiment of the present invention, the limiting mechanism 4 includes: a sliding bar 401, a connecting seat 402, a mounting plate 403, a hand-tightening nut 404, a push plate 405, and a second pressure spring 406. The sliding bar 401 is slidably connected to the top of the table panel 2, the connecting seat 402 is fixedly connected to the front surface of the sliding bar 401, the mounting plate 403 is fixedly connected to the top of the connecting seat 402, the hand-tightening nut 404 is threadedly connected to the top of the mounting plate 403, the push plate 405 is slidably connected to the rear of the mounting plate 403, and the second pressure spring 406 is installed between the push plate 405 and the mounting plate 2. Between plates 403, the limiting mechanism 4 also includes: a protrusion 407, an arc-shaped baffle 408, a bearing seat 409, a lever 410, an elastic telescopic rod 411, and a pressure plate 412. The protrusion 407 is fixedly connected to the left and right sides of the connecting seat 402. The bearing seat 409 is fixedly connected to the top of the platform 2. The arc-shaped baffle 408 is fixedly connected to the inner wall rotating rod surface of the bearing seat 409. The lever 410 is fixedly connected to the inner wall rotating rod surface of the bearing seat 409 and is symmetrical to the arc-shaped baffle 408. The elastic telescopic rod 411 is rotatably connected to the end of the lever 410 away from the bearing seat 409. The pressure plate 412 rotates... The lever 410 is rotatably connected to the end away from the bearing seat 409, and the other end of the elastic telescopic rod 411 is rotatably connected to the back of the pressure plate 412. A rack is provided at the top of the end of the sliding bar 401 away from the fixed block 302, and the rack at the top of the sliding bar 401 meshes with gear 303. A rack of a different specification is provided at the bottom of the sliding bar 401. A hand-tightening nut 404 is located at the connection point between the push plate 405 and the mounting plate 403, used to secure the push plate 405. An anti-slip groove is provided on the front of the pressure plate 412, and an arc-shaped baffle 408 is located on the movement trajectory of the protrusion 407. During welding, it is fixed... The components are fixed to prevent them from moving due to thermal deformation and the pressure of the welding torch. During the movement of the connecting seat 402, the protrusion 407 will also move. As the connecting seat 402 moves, the protrusion 407 will contact and push the arc-shaped baffle 408 to rotate around the bearing seat 409. The rotation of the arc-shaped baffle 408 drives the lever 410 to rotate through the rotating rod inside the bearing seat 409. The rotation of the lever 410 drives the pressure plate 412 to contact and clamp the workpiece, while compressing the elastic telescopic rod 411 to provide lateral clamping force to the workpiece, further improving the stability and safety of the welding process, so as to improve the welding quality. The flipping mechanism 5 includes: a second gear 501, a rotating rod 502, and a lever 503. The rotating rod 502 is rotatably connected to the inner wall of the table panel 2. The second gear 501 is fixedly connected to both ends of the rotating rod 502. The lever 503 is fixedly connected to the circumferential surface of the rotating rod 502. The flipping mechanism 5 also includes: a limiting rod 504, a fork tooth 505, and a semi-circular push rod 506. The limiting rod 504 is fixedly connected to the top of the table panel 2. The fork tooth 505 is movably connected to the circumferential surface of the limiting rod 504. The semi-circular push rod 506 is slidably connected to the top inner wall of the table panel 2 and is driven to rise and fall by a hydraulic telescopic rod at the bottom of the table panel 2. A limiting groove is formed on the circumferential surface of the limiting rod 504, and the limiting groove consists of a quarter-helix groove and a straight groove. The device consists of several levers 503 located within the ventilation grooves of the platform 2. The levers 503 rotate and repeatedly strike the workpiece, causing high-frequency micro-plastic deformation. This redistributes and partially releases residual stress within the workpiece, reducing stress concentration and minimizing deformation or cracking caused by uneven residual stress due to localized high temperatures and cooling during welding. The fork teeth 505 lift the high-temperature workpiece, facilitating hoisting and removal by operators. Once removed from the welding station, the workpiece can immediately proceed to the next process, avoiding delays in production due to waiting for natural cooling. Prolonged contact with high-temperature workpieces can lead to thermal fatigue, oxidation, or deformation of the components. The fork teeth 505 automatically lift the workpiece, shortening the contact time between the fixture and the high temperature, thus extending its service life.

[0018] Working principle: As the connecting shaft 301 rotates downwards, it also drives the gear 303 to rotate. The rotation of the gear 303 drives the sliding bar 401, which meshes with it, to move. The movement of the sliding bar 401 drives the connecting seat 402 to move, which in turn drives the mounting plate 403 to move. The movement of the mounting plate 403 causes the push plate 405 to contact and push the workpiece. The workpiece is pushed onto the backing plate 6 by the push plate 405 and is squeezed. During the squeezing process, the pressure spring 406 is compressed. The force of the pressure spring 406 returning to its original position clamps the workpiece, fixing the components during the welding process and preventing them from... Due to thermal deformation and the pressure of the welding torch, the connecting seat 402 moves, which in turn drives the protrusion 407 to move. As the connecting seat 402 moves, the protrusion 407 contacts and pushes the arc-shaped baffle 408 to rotate around the bearing seat 409. The rotation of the arc-shaped baffle 408 drives the lever 410 to rotate through the rotating rod inside the bearing seat 409. The rotation of the lever 410 drives the pressure plate 412 to contact and clamp the workpiece, while compressing the elastic telescopic rod 411 to provide lateral clamping force to the workpiece, further improving the stability and safety of the welding process, thereby improving the welding quality.

[0019] After welding is completed, the connecting shaft 301 rotates in the reverse direction to release the workpiece. The sliding bar 401 moves back to its initial position. The movement of the sliding bar 401 drives the gear 501, which meshes with its bottom rack, to rotate. The rotation of the gear 501 drives the rotating rod 502 to rotate, which in turn drives the prying block 503 to rotate, repeatedly striking the workpiece and causing it to vibrate. The repeated striking by the prying block 503 causes high-frequency micro-plastic deformation of the workpiece, promoting the redistribution and partial release of residual stress within the workpiece. This reduces stress concentration and minimizes deformation or cracking caused by uneven residual stress inside the workpiece due to localized high temperatures and cooling during welding. During the workpiece process, the hydraulic telescopic rod at the bottom of the worktable 2 drives the semi-circular push rod 506 to rise. The rise of the semi-circular push rod 506 pushes the fork tooth 505 to rise along the threaded groove trajectory on the surface of the limit rod 504. The fork tooth 505 first rotates into the bottom of the workpiece and then rises to lift the workpiece. The fork tooth 505 lifts the high-temperature workpiece, making it convenient for operators to hoist and collect the workpiece and remove it. After the workpiece is removed from the welding station, it can immediately enter the next process, avoiding delays in production rhythm due to waiting for natural cooling. Long-term contact between the device and the high-temperature workpiece can cause thermal fatigue, oxidation, or deformation of the materials of various components on the device. The automatic lifting of the workpiece by the fork tooth 505 can shorten the contact time between the fixture and the high temperature and extend its service life.

[0020] This invention provides a welding and forming apparatus for automotive parts. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention. All components not explicitly stated in this embodiment can be implemented using existing technologies.

Claims

1. A welding forming device for automotive parts, comprising a base (1), characterized in that: The base (1) top fixedly connected with the table panel (2), the table panel (2) top is provided with clamping mechanism (3), the table panel (2) top is also provided with limiting mechanism (4), the table panel (2) inside is provided with the turnover mechanism (5), the table panel (2) top fixedly connected with the backrest (6), the table panel (2) surface is opened with multiple ventilation grooves; The clamping mechanism (3) includes connecting shaft (301), fixed block (302), gear one (303), lower rack (304), adjusting knob (305), upper rack (306), connecting arm (307), pressure bar (308), pressure spring one (309), belt (310), foot pad (311), the fixed block (302) is fixedly connected on the table panel (2) top, the connecting shaft (301) is rotatably connected in the inner wall of fixed block (302), the gear one (303) is fixedly connected at the both ends of connecting shaft (301), the connecting arm (307) is slidably connected on the circumference of connecting shaft (301), the lower rack (304) is fixedly connected at the rear of left connecting arm (307), the upper rack (306) is fixedly connected at the rear of right connecting arm (307), the adjusting knob (305) is engaged between the teeth of lower rack (304) and upper rack (306), the pressure bar (308) is slidably connected in the inner wall of connecting arm (307), one end of the pressure spring one (309) is fixedly connected at the rear of connecting arm (307), the other end of the pressure spring one (309) is fixedly connected at the rear end of pressure bar (308), the foot pad (311) is fixedly connected at the front end of pressure bar (308), the belt (310) is fixedly connected between each pressure bar (308).

2. The apparatus for welding and forming of an automotive part according to claim 1, wherein: The pressure spring one (309) is located at the circumference of pressure bar (308), the inner wall of connecting arm (307) is provided with a keyway, the circumference of connecting shaft (301) is provided with a flat key, for synchronous rotation of connecting arm (307) and connecting shaft (301), the connecting shaft (301) is driven by the motor outside the device.

3. The apparatus of claim 2, wherein: The limiting mechanism (4) includes sliding bar (401), connecting seat (402), mounting plate (403), hand screw nut (404), push plate (405), pressure spring two (406), the sliding bar (401) is slidably connected on the top of table panel (2), the connecting seat (402) is fixedly connected on the front surface of sliding bar (401), the mounting plate (403) is fixedly connected on the top of connecting seat (402), the hand screw nut (404) is threadedly connected on the top of mounting plate (403), the push plate (405) is slidably connected on the rear of mounting plate (403), the pressure spring two (406) is installed between push plate (405) and mounting plate (403).

4. The apparatus of claim 3, wherein: The limiting mechanism (4) further comprises: a protruding block (407), an arc-shaped baffle (408), a bearing seat (409), a lever (410), an elastic telescopic rod (411), and a pressing plate (412). The protruding block (407) is fixedly connected to the left and right sides of the connecting seat (402). The bearing seat (409) is fixedly connected to the top of the table panel (2). The arc-shaped baffle (408) is fixedly connected to the inner wall of the bearing seat (409). The lever (410) is fixedly connected to the inner wall of the bearing seat (409). The elastic telescopic rod (411) is rotatably connected to one end of the lever (410) away from the bearing seat (409). The pressing plate (412) is rotatably connected to one end of the lever (410) away from the bearing seat (409). The other end of the elastic telescopic rod (411) is rotatably connected to the back of the pressing plate (412).

5. The apparatus of claim 4, wherein: The end of the sliding bar (401) away from the fixed block (302) is provided with a rack on the top. The rack on the top of the sliding bar (401) is engaged with the gear one (303). The bottom of the sliding bar (401) is provided with a rack of different specifications from the top. The hand-tightened nut (404) is located at the connecting point of the push plate (405) and the mounting plate (403) for fastening the position of the push plate (405). The front of the pressing plate (412) is provided with an anti-skid groove. The arc-shaped baffle (408) is located on the movement track of the protruding block (407).

6. The apparatus of claim 5, wherein: The turning mechanism (5) comprises: a gear two (501), a rotating rod (502), and a lever (503). The rotating rod (502) is rotatably connected to the inner wall of the table panel (2). The gear two (501) is fixedly connected to the two ends of the rotating rod (502). The lever (503) is fixedly connected to the circumferential surface of the rotating rod (502).

7. The apparatus of claim 6, wherein: The turning mechanism (5) further comprises: a limiting rod (504), a fork tooth (505), and a semicircular push rod (506). The limiting rod (504) is fixedly connected to the top of the table panel (2). The fork tooth (505) is movably connected to the circumferential surface of the limiting rod (504). The semicircular push rod (506) is slidably connected to the inner wall of the top of the table panel (2). The semicircular push rod (506) is driven to rise and fall by the hydraulic telescopic rod at the bottom of the table panel (2).

8. The apparatus of claim 7, wherein: The circumferential surface of the limiting rod (504) is provided with a limiting groove. The limiting groove on the circumferential surface of the limiting rod (504) is composed of a quarter helical groove and a straight groove. Each lever (503) is located in the ventilation groove of the table panel (2).

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