A welding system for processing automotive parts

Abstract

The present invention discloses a welding system for automobile part processing in the technical field of automobile part welding, which includes a welding head and a welding table. The welding head is located above the welding table, and further includes: a docking pin, which is arranged on the welding table, and an installation cavity is opened at the bottom end of the docking pin; an annular groove, on the inner wall of the annular groove, a plurality of inclined air outlets are opened, and a sealing ring is rotatably arranged in the annular groove. After welding is completed, a plurality of docking ports on the sealing ring are docked and communicated with the air outlets, the bottom end of the air vent joint is injected with gas, the gas will enter the first annular cavity through the communication cavity and the first connecting pipe, and the gas in the first annular cavity will sequentially pass through the docking ports and the air outlets, and the gas is blown into the inner side of the nut, and the welding slag inside the nut is blown away, realizing the automatic cleaning of the welding slag inside the nut, which is beneficial to avoiding the welding slag from remaining in the threads inside the nut, and further beneficial to the nut to avoid the adverse impact of the welding slag on the later use of the nut.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile part welding, and specifically relates to a welding system for automobile part processing. Background Technique

[0002] The main purpose of welding nuts on automobile parts is to provide stable connection and fixation. The welding nuts are fixed on automobile parts by welding, which facilitates the connection between parts.

[0003] During the process of welding nuts on automobile parts, since the molten metal in the welding process reacts with oxygen in the air, oxides and impurities are formed, and these impurities solidify into welding slag during the cooling process.

[0004] The welding slag generated by nut spot welding may splash into the interior of the nut. When using nut spot welding, the welding slag splashes into the interior of the nut, and the welding slag splashing into the interior of the nut will block the thread. After welding, it is not convenient to clean the welding slag remaining in the nut, which affects the normal use of the nut in the later stage.

[0005] Based on this, the present invention designs a welding system for automobile part processing to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a welding system for automobile part processing to solve the problem that the welding slag generated by nut spot welding may splash into the interior of the nut as mentioned in the above background technique. When using nut spot welding, the welding slag splashes into the interior of the nut, and the welding slag splashing into the interior of the nut will block the thread. After welding, it is not convenient to clean the welding slag remaining in the nut, which affects the normal use of the nut in the later stage.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A welding system for automobile part processing, including a welding head and a welding table, the welding head is above the welding table, and further includes:

[0008] A docking pin, the docking pin is arranged on the welding table, and an installation cavity is opened at the bottom end of the docking pin;

[0009] An annular groove, the annular groove is opened on the inner wall of the installation cavity, a plurality of inclined air outlets are opened on the inner wall of the annular groove, a sealing ring is rotatably arranged in the annular groove, a first annular cavity is opened inside the sealing ring, and a plurality of docking ports are opened on the inner wall of the first annular cavity;

[0010] An air vent joint, a communication cavity is opened at the bottom of the air vent joint, and a first communication pipe is fixedly communicated between the side wall of the air vent joint and the sealing ring;

[0011] A rotation adjustment assembly, the rotation adjustment assembly is arranged in the installation cavity and is used for rotating and adjusting the air vent joint.

[0012] It should be understood that before welding, the hole on the automotive part is inserted onto the docking pin, and then the nut is sleeved on the docking pin and placed on the surface of the automotive part. During the welding process, the ventilation joint is rotated by rotating the adjustment assembly. The ventilation joint synchronously drives the sealing ring to rotate through the first connecting pipe and the second connecting pipe, so that multiple butting ports on the sealing ring are staggered from the air outlet, and thus the sealing ring seals the air outlet, preventing welding slag from entering the nut and entering the inside of the docking pin through the air outlet;

[0013] During the welding process, the welding head is brought closer to weld the nut and the automotive part;

[0014] After welding is completed, the ventilation joint is rotated by rotating the adjustment assembly. The ventilation joint synchronously drives the sealing ring to rotate through the first connecting pipe and the second connecting nut pipe, so that multiple butting ports on the sealing ring are docked and communicated with the air outlet. The bottom end of the ventilation joint is injected with gas, and the gas will enter the first annular cavity through the communication cavity and the first connecting pipe. The gas in the first annular cavity will sequentially pass through the butting port and the air outlet, and blow the gas into the inner side of the thread to blow away the welding slag inside the nut, realizing automatic cleaning of the welding slag inside the nut.

[0015] As a technical solution of the present invention, a partition body is fixedly arranged in the communication cavity. The partition body includes a first partition body and a second partition body. A first communication port is opened on the second partition body. The first partition body and the second partition body divide the communication cavity into a first cavity and a second cavity. The first cavity is communicated with the first connecting pipe. A second connecting pipe is also fixedly communicated with the side wall of the ventilation joint. Both ends of the second connecting pipe are fixedly communicated with the second cavity and the sealing ring respectively. A one-way valve is installed in the second connecting pipe.

[0016] As a technical solution of the present invention, the bottom of the communication cavity has an insertion port, and an insertion joint is inserted into the insertion port. A second communication port is opened on the insertion joint, and the second communication port is docked and communicated with the first communication port. A second annular cavity is also opened at the bottom of the insertion joint, and a plurality of air holes distributed in an annular array are opened at the top end of the second annular cavity, and the air holes are communicated with the second cavity.

[0017] As a technical solution of the present invention, the insertion joint includes an insertion section and an extension section. The insertion section is prism-shaped, and the insertion port is adaptively inserted with the insertion section.

[0018] As a technical solution of the present invention, the top end of the extension section has a lapping surface, and the lapping surface contacts the bottom of the ventilation joint.

[0019] As a technical solution of the present invention, a support seat is fixedly installed on the welding table. The support seat includes a first support body and a second support body. The first support body is fixedly connected to the welding table. A channel is formed on the surface of the first support body. The second support body is fixedly connected to the top of the first support body. A threaded hole is formed in the top of the second support body. The threaded hole communicates with the channel. The bottom end of the docking pin is fixedly connected with a threaded pipe, and the threaded pipe is threadedly connected in the threaded hole.

[0020] As a technical solution of the present invention, the extension section sequentially passes through the threaded pipe and the threaded hole and then enters the channel. The second communication port extends to the bottom end of the extension section. A linkage ring is rotatably connected to the surface of the extension section. An electric cylinder is arranged between the linkage ring and the inner wall of the channel.

[0021] As a technical solution of the present invention, the bottom end of the second communication port is fixedly connected with a telescopic pipe. The bottom of the telescopic pipe is communicated with a connecting pipe through a pipe rotary joint. The connecting pipe penetrates through the first support body and then extends to the outside of the first support body.

[0022] As a technical solution of the present invention, the rotation driving assembly includes a first motor and a connecting shaft. The first motor is fixedly connected to the inner top surface of the installation cavity. The output end of the first motor is fixedly connected with a driving gear. The connecting shaft is rotatably connected to the inner top surface of the installation cavity. The bottom end of the connecting shaft is fixedly connected to the top of the ventilation joint. A follower gear is fixedly connected to the surface of the connecting shaft. The follower gear meshes with the driving gear.

[0023] As a technical solution of the present invention, the bottom of the welding table is fixedly connected with a slider. The slider is slidably connected to the surface of a slide rail. A threaded rod is rotatably connected inside the slide rail. The slider is threadedly sleeved on the surface of the threaded rod. The end of the slide rail is fixedly connected with a second motor. The output end of the second motor is fixedly connected to the end of the threaded rod. The bottom of the slide rail is fixedly connected with a support table.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. After welding is completed, the ventilation joint is rotated by the rotation adjustment assembly. The ventilation joint synchronously drives the sealing ring to rotate through the first connecting pipe, so that a plurality of butting ports on the sealing ring are butted and communicated with the air outlet, and air injection is carried out at the bottom end of the ventilation joint. The gas will enter the first annular cavity through the communication cavity and the first connecting pipe. The gas in the first annular cavity will sequentially pass through the butting port and the air outlet, and the gas is blown into the inner side of the nut, and the welding slag inside the nut is blown away, realizing automatic cleaning of the welding slag inside the nut, which is beneficial to avoiding the welding slag from remaining in the thread inside the nut, and further beneficial to preventing the welding slag from having an adverse effect on the later use of the nut.

[0026] 2. By setting the first cavity and the second cavity, during the welding process, the interface and the air outlet are staggered. When cooling is required, air can be sucked in from the first communication port, creating a negative pressure in the first cavity. This causes the air flow to pass through the second cavity, the second connecting pipe, the first annular cavity, the first connecting pipe, and the first cavity in sequence, achieving the suction of external gas. The formed air flow can absorb the heat on the docking pin and carry away the heat to achieve heat dissipation.

[0027] When sucking air from the first through-port, the air flow can pass through the one-way valve during the process of passing through the second connecting pipe. When injecting air from the first through-port, the one-way valve will block the gas during the process of the air flow passing through the first annular cavity, preventing the air flow from discharging through the second connecting pipe.

[0028] 3. During the docking process, the threaded pipe is threadedly connected to the threaded hole, enabling the docking pin to be detachable. The electric cylinder is used to push the linkage ring, and the linkage ring synchronously drives the extension section of the plug connector. The extension section drives the insertion section to insert into the insertion port, and the top overlapping surface of the extension section is pressed tightly against the bottom end of the ventilation joint. A sealing ring can be set on the overlapping surface to form a seal between the overlapping surface and the ventilation joint, enabling communication between the second communication port and the first communication port. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the overall structural schematic diagram of the present invention;

[0030] Figure 2 is the structural sectional view of the first support body and the second support body of the present invention;

[0031] Figure 3 is the structural sectional view of the docking pin of the present invention;

[0032] Figure 4 is Figure 3 the enlarged view of part A in

[0033] Figure 5 is Figure 4 the enlarged view of part B in

[0034] Figure 6 is the structural schematic diagram of the partition body of the present invention;

[0035] Figure 7 is the structural schematic diagram of the sealing ring of the present invention;

[0036] Figure 8 is the first structural schematic diagram of the welding table and the slide rail of the present invention;

[0037] Figure 9 is the second structural schematic diagram of the welding table and the slide rail of the present invention;

[0038] Figure 10 This is a schematic structural diagram of the plug joint of the present invention.

[0039] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0040] Automobile part 1, nut 2, welding head 3, welding table 4, docking pin 5, installation cavity 501, annular groove 502, air outlet 6, sealing ring 7, first annular cavity 701, docking port 702, ventilation joint 8, communication cavity 9, first cavity 901, second cavity 902, first communication pipe 10, first motor 11, connecting shaft 12, driving gear 13, follower gear 14, partition body 15, first partition body 1501, second partition body 1502, first communication port 1503, second communication pipe 16, insertion port 17, plug joint 18, insertion section 1801, extension section 1802, overlapping surface 1803, second communication port 1804, second annular cavity 19, air hole 20, first support body 21, second support body 22, channel 23, threaded hole 24, threaded pipe 25, linkage ring 26, electric cylinder 27, telescopic pipe 28, connecting pipe 29, slider 30, slide rail 31, threaded rod 32, support table 33, welding frame 34, cylinder 35, second motor 36, pipeline rotary joint 37, check valve 38. Specific embodiments

[0041] Please refer to Figures 1 to 10 , the present invention provides a technical solution: a welding system for processing automobile parts, including a welding head 3 and a welding table 4, the welding head 3 is located above the welding table 4, and further includes:

[0042] Docking pin 5, the docking pin 5 is arranged on the welding table 4, and an installation cavity 501 is opened at the bottom end of the docking pin 5;

[0043] Annular groove 502, the annular groove 502 is opened on the inner wall of the installation cavity 501, a plurality of inclined air outlets 6 are opened on the inner wall of the annular groove 502, a sealing ring 7 is rotatably arranged in the annular groove 502, and a first annular cavity 701 is opened inside the sealing ring 7, and a plurality of docking ports 702 are opened on the inner wall of the first annular cavity 701;

[0044] Ventilation joint 8, a communication cavity 9 is opened at the bottom of the ventilation joint 8, and a first communication pipe 10 is fixedly connected between the side wall of the ventilation joint 8 and the sealing ring 7;

[0045] The rotation adjustment assembly is arranged in the installation cavity 501 and is used to rotationally adjust the ventilation joint 8. The rotation drive assembly includes a first motor 11 and a connecting shaft 12. The first motor 11 is fixedly connected to the inner top surface of the installation cavity 501. The output end of the first motor 11 is fixedly connected with a driving gear 13. The connecting shaft 12 is rotatably connected to the inner top surface of the installation cavity 501. The bottom end of the connecting shaft 12 is fixedly connected to the top of the ventilation joint 8. A follower gear 14 is fixedly connected to the surface of the connecting shaft 12, and the follower gear 14 meshes with the driving gear 13.

[0046] It should be understood that before welding, the hole on the automotive part 1 is plugged on the docking pin 5. Then, the nut 2 is sleeved on the docking pin 5 and is placed on the surface of the automotive part 1. During the welding process, the ventilation joint 8 is rotated by the rotation adjustment assembly. The ventilation joint 8 synchronously drives the sealing ring 7 to rotate through the first connecting pipe 10, so that a plurality of docking ports 702 on the sealing ring 7 are staggered from the air outlet 6. Furthermore, the sealing ring 7 seals the air outlet 6 to prevent welding slag from entering the nut 2 and entering the inside of the docking pin 5 through the air outlet 6;

[0047] During the welding process, the welding head 3 is brought close to the nut 2 to weld the nut 2 and the automotive part 1;

[0048] After welding is completed, the ventilation joint 8 is rotated by the rotation adjustment assembly. The ventilation joint 8 synchronously drives the sealing ring 7 to rotate through the first connecting pipe 10, so that a plurality of docking ports 702 on the sealing ring 7 are docked and communicated with the air outlet 6. The bottom end of the ventilation joint 8 is injected with gas. The gas will enter the first annular cavity 701 through the communication cavity 9 and the first connecting pipe 10. The gas in the first annular cavity 701 will sequentially pass through the docking port 702 and the air outlet 6, and blow the gas into the inside of the nut 2 to blow away the welding slag inside the nut 2, realizing the automatic cleaning of the welding slag inside the nut 2.

[0049] As Figure 3 、 Figure 4 shown, in one embodiment, a partition body 15 is fixedly arranged in the communication cavity 9. The partition body 15 includes a first partition 1501 and a second partition 1502. A first communication port 1503 is opened on the second partition 1502. The first partition 1501 and the second partition 1502 divide the communication cavity 9 into a first cavity 901 and a second cavity 902. A second connecting pipe 16 is also fixedly communicated with the side wall of the ventilation joint 8. The first cavity 901 is communicated with the first connecting pipe 10. The two ends of the second connecting pipe 16 are fixedly communicated with the second cavity 902 and the sealing ring 7 respectively. A one-way valve 38 is installed in the second connecting pipe 16.

[0050] It should be understood that by providing the first cavity 901 and the second cavity 902, during the welding process, the interface 702 and the air outlet 6 are staggered. When cooling is required, air can be inhaled from the first communication port 1503, creating a negative pressure in the first cavity 901. This causes the air flow to pass successively through the second cavity 902, the second connecting pipe 16, the first annular cavity 701, the first connecting pipe 10, and the first cavity 901, sucking in external air. The resulting air flow can absorb the heat on the docking pin 5 and carry away the heat, achieving heat dissipation.

[0051] When inhaling air from the first through-port 1503, during the process of the air flow passing through the second connecting pipe 16, the air flow can pass through the one-way valve 38. When injecting air from the first through-port 1503, during the process of the air flow passing through the first annular cavity 701, the one-way valve 38 blocks the gas to prevent the air flow from discharging through the second connecting pipe 16.

[0052] Such as Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 10 As shown in

[0053] It should be understood that after inserting the plug joint 18 into the socket 17, the position for connecting the gas can be extended to the outside of the docking pin 5, facilitating the connection of the second communication port 1804 with an external fan.

[0054] By providing the air holes 20 and the second annular cavity 19, during heat dissipation, external air can be diverted into the second cavity 902.

[0055] Such as Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 10 As shown in

[0056] It should be understood that by setting the insertion section 1801, the docking with the insertion port 17 is achieved, and through the prismatic design, the relative stability between the insertion port 17 and the insertion section 1801 is realized.

[0057] As Figure 2 , Figure 8 and Figure 9 shown, specifically, a support base is fixedly installed on the welding table 4. The support base includes a first support body 21 and a second support body 22. The first support body 21 is fixedly connected to the welding table 4. A channel 23 is provided on the surface of the first support body 21. The second support body 22 is fixedly connected to the top of the first support body 21. A threaded hole 24 is provided at the top of the second support body 22. The threaded hole 24 communicates with the channel 23. The bottom end of the docking pin 5 is fixedly connected with a threaded pipe 25. The threaded pipe 25 is threadedly connected in the threaded hole 24;

[0058] The extension section 1802 sequentially passes through the threaded pipe 25 and the threaded hole 24 and then enters the channel 23. The second communication port 1804 extends to the bottom end of the extension section 1802. A linkage ring 26 is rotatably connected to the surface of the extension section 1802. An electric cylinder 27 is provided between the linkage ring 26 and the inner wall of the channel 23.

[0059] It should be understood that the threaded pipe 25 is threadedly connected with the threaded hole 24 to make the docking pin 5 detachable. After the docking pin 5 is docked with the support base, the electric cylinder 27 is used to push the linkage ring 26. The linkage ring 26 synchronously drives the extension section of the plug connector 18. The extension section drives the insertion section 1801 to be inserted into the insertion port 17, and the top lap joint surface 1803 of the extension section 1802 is pressed against the bottom end of the ventilation joint 8. A sealing ring 7 can be provided on the lap joint surface 1803 to form a seal between the lap joint surface 1803 and the ventilation joint 8, so that a connection is formed between the second communication port 1804 and the first communication port 1503.

[0060] As Figure 2 and Figure 3 shown, in one embodiment, the bottom end of the second communication port 1804 is fixedly connected with a telescopic pipe 28. The bottom of the telescopic pipe 28 is connected with a connecting pipe 29 through a pipe rotary joint 37. The connecting pipe 29 penetrates through the first support body 21 and extends to the outside of the first support body 21. It should be understood that in order to set the ventilation point at a position convenient for connecting to the ventilator, the connecting pipe 29 is extended to the outside of the first support body 21, and during the rising process of the extension section 1802, the telescopic pipe 28 can provide telescopic freedom.

[0061] As Figure 1 , Figure 8 and Figure 9As shown, in one embodiment, a slider 30 is fixedly connected to the bottom of the welding table 4. A slide rail 31 is slidably connected to the surface of the slider 30. A threaded rod 32 is rotatably connected inside the slide rail 31. The slider 30 is threadedly sleeved on the surface of the threaded rod 32. The end of the slide rail 31 is fixedly connected to a second motor 36. The output end of the second motor 36 is fixedly connected to the end of the threaded rod 32. The bottom of the slide rail 31 is fixedly connected to a support table 33. By the threaded drive of the threaded rod 32, the position of the welding table 4 is adjusted to align the automotive component 1 on the docking pin 5 with the nut 2 and the welding head 3.

[0062] A welding frame 34 is arranged at the rear side of the support table 33. A cylinder 35 is fixedly installed at the top of the welding frame 34. The piston rod of the cylinder 35 passes through the welding frame 34 and is fixedly connected to the welding head 3. By arranging the cylinder 35, the height of the welding head 3 can be adjusted.

[0063] As Figure 1 shown, in one embodiment, when there are multiple positions on the automotive component 1 that need to be welded on the same linear track, multiple support seats can be fixedly installed on the welding table 4, multiple docking pins 5 can be installed on the support seats, and by the threaded drive of the threaded rod 32, the position of the welding table 4 is adjusted to align the automotive component 1 on the docking pin 5 with the nut 2 and the welding head 3.

[0064] Two welding heads 3 can be provided, and two cylinders 35 are provided correspondingly. The two welding heads 3 are distributed at different positions, and the nut 2 can be welded at different positions of the automotive component 1.

Claims

1. A welding system for processing automotive parts, including a welding head (3) and a welding table (4), the welding head (3) being above the welding table (4), characterized in that: Further comprising: A docking pin (5), the docking pin (5) is arranged on the welding table (4), and an installation cavity (501) is opened at the bottom end of the docking pin (5); An annular groove (502), the annular groove (502) is opened on the inner wall of the installation cavity (501), a plurality of inclined air outlets (6) are opened on the inner wall of the annular groove (502), a sealing ring (7) is rotatably arranged in the annular groove (502), a first annular cavity (701) is opened inside the sealing ring (7), and a plurality of docking ports (702) are opened on the inner wall of the first annular cavity (701); An air vent joint (8), a communication cavity (9) is opened at the bottom of the air vent joint (8), and a first communication pipe (10) is fixedly communicated between the side wall of the air vent joint (8) and the sealing ring (7); A rotation adjustment assembly, the rotation adjustment assembly is arranged in the installation cavity (501) for rotating and adjusting the air vent joint (8); A partition body (15) is fixedly arranged in the communication cavity (9), the partition body (15) includes a first partition body (1501) and a second partition body (1502), a first communication port (1503) is opened on the second partition body (1502), the first partition body (1501) and the second partition body (1502) divide the communication cavity (9) into a first cavity (901) and a second cavity (902), the first cavity (901) is communicated with the first communication pipe (10), a second communication pipe (16) is also fixedly communicated on the side wall of the air vent joint (8), both ends of the second communication pipe (16) are fixedly communicated with the second cavity (902) and the sealing ring (7) respectively, and a one-way valve (38) is installed in the second communication pipe (16); The bottom of the communication cavity (9) has an insertion port (17), an insertion joint (18) is inserted in the insertion port (17), a second communication port (1804) is opened on the insertion joint (18), the second communication port (1804) is docked and communicated with the first communication port (1503), a second annular cavity (19) is also opened at the bottom of the insertion joint (18), a plurality of air holes (20) distributed in an annular array are opened at the top end of the second annular cavity (19), and the air holes (20) are communicated with the second cavity (902); The insertion joint (18) includes an insertion section (1801) and an extension section (1802), the insertion section (1801) is prismatic, and the insertion port (17) is adaptively inserted with the insertion section (1801); The rotation drive assembly includes a first motor (11) and a connecting shaft (12), the first motor (11) is fixedly connected to the inner top surface of the installation cavity (501), the output end of the first motor (11) is fixedly connected with a driving gear (13), the connecting shaft (12) is rotatably connected to the inner top surface of the installation cavity (501), the bottom end of the connecting shaft (12) is fixedly connected to the top of the air vent joint (8), a follower gear (14) is fixedly connected to the surface of the connecting shaft (12), and the follower gear (14) meshes with the driving gear (13).

2. The welding system for processing automotive parts according to claim 1, wherein: The top end of the extension section (1802) has a lapping surface (1803), and the lapping surface (1803) contacts the bottom of the ventilation joint (8).

3. A welding system for processing automotive parts according to claim 2, wherein: A support base is fixedly installed on the welding table (4). The support base includes a first support body (21) and a second support body (22). The first support body (21) is fixedly connected to the welding table (4). A channel (23) is formed on the surface of the first support body (21). The second support body (22) is fixedly connected to the top of the first support body (21). A threaded hole (24) is formed in the top of the second support body (22). The threaded hole (24) communicates with the channel (23). The bottom end of the docking pin (5) is fixedly connected with a threaded pipe (25). The threaded pipe (25) is threadedly connected in the threaded hole (24).

4. A welding system for processing automotive parts according to claim 3, characterized in that: The extension section (1802) sequentially passes through the threaded pipe (25) and the threaded hole (24) and then enters the channel (23). The second communication port (1804) extends to the bottom end of the extension section (1802). A linkage ring (26) is rotatably connected to the surface of the extension section (1802). An electric cylinder (27) is arranged between the linkage ring (26) and the inner wall of the channel (23).

5. A welding system for processing automotive parts according to claim 4, characterized in that: The bottom end of the second communication port (1804) is fixedly connected with a telescopic pipe (28). The bottom of the telescopic pipe (28) is connected to a connecting pipe (29) through a pipe rotary joint (37). The connecting pipe (29) penetrates through the first support body (21) and then extends to the outside of the first support body (21).

6. A welding system for processing automotive parts according to claim 5, characterized in that: The bottom of the welding table (4) is fixedly connected with a slider (30). A slide rail (31) is slidably connected to the surface of the slider (30). A threaded rod (32) is rotatably connected inside the slide rail (31). The slider (30) is threadedly sleeved on the surface of the threaded rod (32). The end of the slide rail (31) is fixedly connected with a second motor (36). The output end of the second motor (36) is fixedly connected to the end of the threaded rod (32). The bottom of the slide rail (31) is fixedly connected with a support table (33).

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