Sheet metal part welding clamp

Abstract

The invention discloses a sheet metal part welding clamp which comprises a driving unit and a lower clamp structure driven by the driving unit to slide, the lower clamp structure is matched with an upper clamp structure, and the sliding of the upper clamp structure is guided by the driving unit. An electric telescopic rod is installed between the lower clamp structure and the upper clamp structure, the bottom of the electric telescopic rod is fixed to the lower clamp structure, and the telescopic end of the electric telescopic rod is fixed to the upper clamp structure. The device can clamp the upper end and the lower end of the cabinet plate at the same time, so that stable welding is facilitated.

Description

Technical Field

[0001] The invention relates to a sheet metal welding fixture. Background Art

[0002] The metal cabinet is assembled by four side cabinet panels, and then covered with a top cover and a base.

[0003] There are two ways to connect cabinet panels: one is riveting and the other is welding. Riveting technology has poor sealing at the cabinet panel connection, and poor waterproof and moisture-proof effects. It is mainly used for cabinets with low precision requirements. The weld formed by welding has better sealing, and the overall firmness of the welded cabinet is higher.

[0004] For welding the cabinet body, the existing method is to clamp four cabinet panels with a fixture. After clamping, a uniform weld is formed between adjacent cabinet panels, and welding is performed at the weld.

[0005] This type of fixture in the prior art simply clamps the bottom of the cabinet board, while the upper end is usually not clamped, which makes the weld formed between the cabinet boards relatively unstable and prone to weld defects caused by the weld being too wide.

[0006] Based on the above problems, we designed a sheet metal welding fixture that can clamp the upper and lower ends of the cabinet panel at the same time to facilitate stable welding. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a sheet metal welding fixture which can clamp the upper and lower ends of a cabinet panel simultaneously so as to facilitate stable welding.

[0008] To solve the above problems, the present invention adopts the following technical solutions:

[0009] A sheet metal welding fixture comprises a driving unit and a lower fixture structure driven to slide by the driving unit, the lower fixture structure is cooperated with an upper fixture structure, the sliding of the upper fixture structure is guided by the driving unit, an electric telescopic rod is installed between the lower fixture structure and the upper fixture structure, the bottom of the electric telescopic rod is fixed to the lower fixture structure, and the telescopic end of the electric telescopic rod is fixed to the upper fixture structure; it also comprises a box structure, the lower fixture structure and the upper fixture structure are driven by the driving unit to ascend to the interior of the box structure; a welding gun is inserted through the four corners of the box structure, and the cabinet to be welded contacts the welding gun during the ascending process, and waste smoke generated during the welding process is exhausted through the box structure.

[0010] Preferably, the driving unit includes an equipment box, a top plate, a guide rod, a reduction motor and a lead screw, the guide rod is fixedly installed between the equipment box and the top plate, more than two guide rods are arranged in parallel, a bearing is matched between the upper end of the lead screw and the top plate, a motor bracket is installed in the equipment box, the reduction motor is fixed to the bottom of the motor bracket, the output end of the reduction motor is connected to the lead screw, a first bearing is matched between the output end of the reduction motor and the motor bracket, the lower clamp structure matches the guide rod and the lead screw, the upper clamp structure matches the guide rod, and the lead screw passes through the upper clamp structure; a wire box is installed inside the equipment box, a folding tube is installed between the lower clamp structure and the equipment box, the folding tube corresponds to the wire box, and a wiring harness connecting the electric telescopic rod passes through the folding tube.

[0011] Preferably, the lower clamp structure includes a lower base plate and a lower bracket, the top of the lower base plate is provided with a lower clamp seat in a rectangular shape, and the top of the lower clamp seat is provided with a lower slot for inserting a cabinet panel; a lower connecting plate is provided between the lower bracket and the lower base plate, a first linear bearing is installed on the plate surface of the lower bracket, the guide rod cooperates with the first linear bearing, a lead screw nut is installed on the plate surface of the lower bracket, and the lead screw cooperates with the lead screw nut; the electric telescopic rod is fixedly installed on the top of the lower bracket, and a threading hole corresponding to the folding tube is opened on the plate surface of the lower bracket, and the folding tube is connected to the bottom of the lower bracket.

[0012] Preferably, the upper clamp structure includes an upper top plate and an upper bracket, the bottom of the upper top plate is rectangularly distributed with an upper clamp seat corresponding to the lower clamp seat, the upper clamp seat has an upper slot corresponding to the lower slot, the welded cabinet panel is clamped between the lower slot and the upper slot, an upper connecting plate is arranged between the upper top plate and the upper bracket, a second linear bearing cooperating with the guide rod is installed on the upper bracket, and a through hole passing through the lead screw is opened on the plate surface of the upper bracket; the telescopic end of the electric telescopic rod is fixed to the upper bracket.

[0013] Preferably, the box structure includes a box, the lower end of the box has an opening, a slide groove is provided at the rear end of the box, the slide groove penetrates downward through the box, the box is fixed to the bottom of the top plate, the lower bottom plate and the upper top plate enter the box through the opening, and the lower connecting plate and the upper connecting plate enter along the slide groove; open grooves are processed at the four corners of the box near the bottom, and the welding gun is inserted through the open groove.

[0014] Preferably, a partition is welded at the inner upper position of the box body, and a negative pressure chamber is formed at the upper end of the partition. A ventilation hole is arranged at the front end surface of the box body, and a negative pressure fan is installed at the front end surface of the box body at a position corresponding to the ventilation hole, the air inlet end of the negative pressure fan corresponds to the ventilation hole, and an exhaust pipe is installed at the air outlet end of the negative pressure fan; on the left and right sides of the box body, a connecting pipe is arranged between two adjacent opening grooves, a pipe cover is installed at the pipe mouth of the connecting pipe, an air duct is connected between the connecting pipe and the negative pressure chamber, and the air duct is inserted into the negative pressure chamber.

[0015] Preferably, a ventilation pipe is installed at the middle position of the upper top plate, the upper end of the ventilation pipe is processed to form a tapered guide portion, and a ventilation groove is opened on the outer wall of the ventilation pipe; a pipe is processed on the plate surface of the partition, and the pipe corresponds to the ventilation pipe; an elastic sealing device is installed on the inner top of the box body, and the elastic sealing device closes the pipe. When the upper top plate moves up to the extreme position, the ventilation pipe pushes the elastic sealing device upward, and the ventilation groove at this time enters into the negative pressure chamber; a passive sealing device is installed on the top of the box body, and the passive sealing device cooperates with the air duct. Under normal circumstances, the air duct is in a conducting state. When the elastic sealing device is compressed under the action of the ventilation pipe, the elastic sealing device drives the passive sealing device to move, and when it moves to the extreme position, the passive sealing device seals the air duct.

[0016] Preferably, the elastic sealing device includes a hanger and a sealing tube, a sealing plate is provided at the bottom of the sealing tube, the upper end of the hanger is fixed to the box body, the lower end of the hanger is inserted into the sealing tube, the hanger is coaxial with the sealing tube, a limiting nut is screwed into the bottom of the hanger, the limiting nut slides along the inner wall of the sealing tube, a pipe cap is screwed into the top of the sealing tube, the hanger passes through the pipe cap, the pipe cap limits the upward movement of the limiting nut, a spring is installed in the sealing tube, under the action of the spring and gravity, the sealing plate enters the pipeline and forms a seal on the pipeline; a conical force part is processed at the outer wall of the sealing tube, the diameter of the force part gradually decreases upward, and the force part cooperates with the passive sealing device.

[0017] Preferably, the passive sealing device includes a guide plate and a sealing rod, a guide hole is processed on the plate surface of the guide plate, a guide block is processed on the hole wall of the guide hole, the sealing rod passes through the guide hole and corresponds to the air duct, a guide groove is processed on the rod body of the sealing rod, the guide groove passes in the direction away from the air duct, a truncated cone-shaped guide part is processed at one end of the sealing rod, the guide part corresponds to the air duct, one or more elastic sealing rings are clamped on the sealing rod, the elastic sealing ring forms a seal with the sealing tube, and a first limiting ring and a second limiting ring are installed on the sealing rod. The first limiting ring and the second limiting ring are respectively located on both sides of the guide plate, and a second spring is sleeved on the sealing rod, and the second spring acts between the guide plate and the second limiting ring. Under the action of the second spring, the sealing rod is displaced in the direction away from the air duct, and the first limiting ring limits the displacement of the sealing rod. A pulley seat is welded to the end of the sealing rod away from the guided part, and a force pulley is rotatably installed on the pulley seat; after the force-making part moves upward, it cooperates with the force pulley, and after the force pulley is subjected to force, it pushes the sealing rod to be inserted into the air duct.

[0018] The beneficial effects of the present invention are:

[0019] Advantage 1: This device can realize the simultaneous clamping of the upper and lower ends of the cabinet panel. After clamping, a stable weld is formed between adjacent cabinet panels, which improves the welding quality. At the same time, welding is performed at the four corners at the same time, which improves the welding speed.

[0020] The second advantage is that the welding gun can be directly inserted into the box structure, and the cabinet panel can be driven upward into the box structure through the driving unit, so that the entire welding process is carried out inside the cabinet structure, reducing light pollution during welding, and at the same time collecting the waste smoke and particulate matter generated during the welding process to avoid spreading in the workshop.

[0021] Advantage three: This device drives the cabinet plate upward and stably enters the box structure through the rotation of the lead screw. During this process, the position of the welding gun remains unchanged, making the welding forming more stable and reliable, and improving the welding quality.

[0022] Advantage four: after welding is completed, the device can also extract the waste gas and particulate matter that enters the cabinet, so that when the cabinet is taken out later, the cabinet will not carry waste gas and particulate matter, making the entire production process more environmentally friendly and protecting the health of the workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the coordination between the driving unit and the lower fixture structure;

[0026] Figure 3 This is a schematic diagram of the interior of the box;

[0027] Figure 4 Schematic diagram of the cooperation between the driving unit and the lower fixture structure and the upper fixture structure;

[0028] Figure 5 It is a front schematic diagram of the box structure;

[0029] Figure 6 It is a rear schematic diagram of the box structure;

[0030] Figure 7 It is a cross-sectional view of the box structure;

[0031] Figure 8 It is a schematic diagram of the coordination between the elastic sealing device and the passive sealing device;

[0032] Fig. 9 This is the enlarged view of point A;

[0033] Fig.10 is a three-dimensional diagram of a passive sealing device;

[0034] Fig.11 It is a schematic diagram when the lower fixture structure moves downward to the limit position;

[0035] Fig.12 Schematic diagram of the cabinet panel being clamped. DETAILED DESCRIPTION

[0036] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0037] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0038] In the description of the present invention, it is necessary to understand that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "center", "end", "length", "outer end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In addition, in the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "disposed", "socketed", "connected", "through", "plugged" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] See also Figure 1 , Figure 2 , Fig.11 and Fig.12 A sheet metal welding fixture shown in the figure includes a driving unit 1, and a lower fixture structure 2 driven to slide by the driving unit 1, the lower fixture structure 2 is cooperated with an upper fixture structure 3, the sliding of the upper fixture structure 3 is guided by the driving unit 1, an electric telescopic rod 4 is installed between the lower fixture structure 2 and the upper fixture structure 3, the bottom of the electric telescopic rod 4 is fixed to the lower fixture structure 2, and the telescopic end of the electric telescopic rod 4 is fixed to the upper fixture structure 3; it also includes a box structure 5, the lower fixture structure 2 and the upper fixture structure 3 are driven by the driving unit 1 to ascend to the inside of the box structure 5; the welding gun is inserted through the four corners of the box structure 5, the cabinet to be welded contacts the welding gun during the ascending process, and the waste smoke generated during the welding process is exhausted through the box structure 5.

[0042] In the above technical solution, the driving unit 1 is fixed on the ground by using ground bolts.

[0043] The lower clamp structure 2 is driven by the driving unit 1 to move up and down, and the distance between the upper clamp structure 3 and the lower clamp structure 2 is shortened by the retraction of the electric telescopic rod 4, thereby completing the clamping of the cabinet panel.

[0044] After the four cabinet panels are clamped by the lower clamp structure 2 and the upper clamp structure 3 , the cabinet panels are lifted upward by the driving unit 1 until the cabinet panels enter the box structure 5 .

[0045] The welding gun is installed through the box structure 5, and the welding gun is used to weld between adjacent cabinet panels. As the cabinet is slowly fed upward, welding is gradually achieved, and the welding is more uniform.

[0046] The waste gas generated during the welding process is concentrated in the box structure 5 and discharged through the box structure 5 to avoid exceeding the harmful gas standard in the production workshop.

[0047] After welding is completed, the driving unit 1 drives the lower clamp structure 2 and the upper clamp structure 3 to return to their original positions. After returning to the initial positions, the electric telescopic rod 4 extends, so that the upper clamp structure 3 is separated from the welded cabinet, and then the cabinet is removed from the top of the lower clamp structure 2, thus completing the entire processing step.

[0048] See also Figure 1 , Figure 2 and Figure 3 As shown, the drive unit 1 includes an equipment box 101, a top plate 102, a guide rod 103, a reduction motor 104 and a lead screw 105. The guide rod 103 is fixedly installed between the equipment box 101 and the top plate 102. More than two guide rods 103 are arranged in parallel. A bearing is matched between the upper end of the lead screw 105 and the top plate 102. A motor bracket 106 is installed in the equipment box 101. The reduction motor 104 is fixed to the bottom of the motor bracket 106. The output end of the reduction motor 104 is connected to the lead screw 105. A first bearing is provided between the output end of the reduction motor 104 and the motor bracket 106, the lower clamp structure 2 cooperates with the guide rod 103 and the lead screw 105, the upper clamp structure 3 cooperates with the guide rod 103, and the lead screw 105 passes through the upper clamp structure 3; a wire box 107 is installed inside the equipment box 101, and a folding tube 108 is installed between the lower clamp structure 2 and the equipment box 101, the folding tube 108 corresponds to the wire box 107, and the wiring harness connecting the electric telescopic rod 4 passes through the folding tube 108.

[0049] In the above technical solution, the equipment box 101 is fixed to the ground by ground bolts, so that the bottom of the device is stable.

[0050] The lead screw 105 is driven to rotate by the reduction motor 104 , and the rotation of the lead screw 105 drives the lower clamp structure 2 to move vertically along the guide rod 103 .

[0051] See also Figure 1 and Figure 4As shown, the lower clamp structure 2 includes a lower base plate 201 and a lower bracket 202, the top of the lower base plate 201 is provided with a lower clamp seat 203 in a rectangular shape, and the top of the lower clamp seat 203 is provided with a lower slot 204 for inserting a cabinet panel; a lower connecting plate is provided between the lower bracket 202 and the lower base plate 201, a first linear bearing 205 is installed on the plate surface of the lower bracket 202, the guide rod 103 cooperates with the first linear bearing 205, a lead screw nut 206 is installed on the plate surface of the lower bracket 202, and the lead screw 105 cooperates with the lead screw nut 206; the electric telescopic rod 4 is fixedly installed on the top of the lower bracket 202, and a threading hole 207 corresponding to the folding tube 108 is opened on the plate surface of the lower bracket 202, and the folding tube 108 is connected to the bottom of the lower bracket 202.

[0052] In the above technical solution, the cabinet panels are inserted through the lower clamping seat 203, and the two adjacent lower clamping seats 203 are disconnected, so that the adjacent cabinet panels are spliced ​​to form a weld, and the welding gun is used to weld the weld to complete the welding connection between the adjacent cabinet panels.

[0053] The folding tube 108 is used for threading to prevent the lead screw 105 from winding around the wire harness connected to the electric telescopic rod 4 .

[0054] See also Figure 4 As shown, the upper clamp structure 3 includes an upper top plate 301 and an upper bracket 302, the bottom of the upper top plate 301 is rectangularly distributed with an upper clamp seat 303 corresponding to the lower clamp seat 203, the upper clamp seat 303 has an upper slot 304 corresponding to the lower slot 204, the welded cabinet plate is clamped between the lower slot 204 and the upper slot 304, an upper connecting plate 333 is arranged between the upper top plate 301 and the upper bracket 302, a second linear bearing 305 matching the guide rod 103 is installed at the upper bracket 302, and a through hole 306 passing through the lead screw 105 is opened on the plate surface of the upper bracket 302; the telescopic end of the electric telescopic rod 4 is fixed to the upper bracket 302.

[0055] In the above technical solution, the upper end of the cabinet board is clamped by the upper clamping seat 303, and the upper top plate 301 is driven to move downward by the retraction of the electric telescopic rod 4, so that the device can meet the clamping needs of cabinet boards of different heights.

[0056] It is also convenient to move the upper top plate 301 upward after the welding of the cabinet panels is completed, so as to remove the welded cabinet body.

[0057] See also Figure 2 , Figure 5 and Figure 6As shown, the box structure 5 includes a box 501, the lower end of which has an opening, and a slide groove 502 is provided at the rear end of the box 501, the slide groove 502 penetrates downward through the box 501, the box 501 is fixed to the bottom of the top plate 102, the lower bottom plate 201 and the upper top plate 301 enter the box 501 through the opening, and the lower connecting plate and the upper connecting plate 333 enter along the slide groove 502; the four corners of the box 501 are processed with open grooves 503 near the bottom, and the welding gun is inserted through the open groove 503.

[0058] In the above technical solution, the box body 501 can be used with four welding guns, which are respectively inserted into the box body 501 from the opening slots 503 at the four corners.

[0059] When the lower clamp structure 2 and the upper clamp structure 3 clamp the cabinet panels upward, four welding guns are started at the same time to perform synchronous welding on adjacent cabinet panels.

[0060] Cooperating with the rotation of the lead screw, the lower clamp structure 2 is driven to move upward stably, making the weld more uniform.

[0061] See also Figure 5 and Figure 7 As shown, a partition 504 is welded at the inner upper position of the box body 501, and a negative pressure chamber 505 is formed at the upper end of the partition 504. A ventilation hole 506 is arranged at the front end surface of the box body 501. A negative pressure fan 507 is installed at the front end surface of the box body 501 at a position corresponding to the ventilation hole 506. The air inlet end of the negative pressure fan 507 corresponds to the ventilation hole 506, and an exhaust pipe 508 is installed at the air outlet end of the negative pressure fan 507; on the left and right sides of the box body 501, a connecting pipe 509 is arranged between two adjacent opening grooves 503, and a pipe cover 510 is installed at the pipe mouth of the connecting pipe 509, and an air duct 511 is connected between the connecting pipe 509 and the negative pressure chamber 505, and the air duct 511 is inserted into the negative pressure chamber 505.

[0062] During the welding process, a lot of waste gas will be generated. This waste gas will accumulate in the production workshop, causing the particulate matter and harmful gas content in the production workshop to exceed the standard.

[0063] In the above technical solution, the welding takes place at the inner side of the opening groove 503. After the negative pressure fan 507 is started, negative pressure is generated at the bottom of the box 501, which captures the waste smoke and fine particles generated during the welding process. These waste gases are uniformly discharged to the air treatment equipment through the air duct 511, thereby ensuring the cleanliness of the air in the production workshop and effectively protecting the health of the workers.

[0064] The design of box body 501 allows the welding process to be carried out inside box body 501, which is convenient for collecting exhaust gas and particulate matter.

[0065] See also Figure 4 , Figure 7 and Figure 8 As shown, a vent pipe 3331 is installed at the middle position of the upper top plate 301, the upper end of the vent pipe 3331 is processed to form a conical guide portion 3332, and a vent groove 3333 is opened on the outer wall of the vent pipe 3331; a pipe 551 is processed on the plate surface of the partition 504, and the pipe 551 corresponds to the vent pipe 3331; an elastic sealing device 6 is installed on the inner top of the box body 501, and the elastic sealing device 6 closes the pipe 551. When the upper top plate 301 moves up to the limit position, the The ventilation pipe 3331 pushes the elastic sealing device 6 upward, and the ventilation groove 3333 enters into the negative pressure chamber 505 at this time; a passive sealing device 7 is installed on the top of the box body 501, and the passive sealing device 7 cooperates with the air duct 511. Under normal circumstances, the air duct 511 is in a conducting state, and when the elastic sealing device 6 is compressed under the action of the ventilation pipe 3331, the elastic sealing device 6 drives the passive sealing device 7 to move, and when it moves to the extreme position, the passive sealing device 7 seals the air duct 511.

[0066] In the above technical solution, after the welding of the cabinet board is completed, the lower clamp structure 2 moves upward to a position higher than the welding gun, and the welding gun has stopped working at this time. The upper ventilation pipe 3331 is inserted upward into the pipe 551 and pushes open the elastic sealing device 6. After the elastic sealing device 6 is pushed open, the passive sealing device 7 is driven to seal the air duct 511. At this time, the negative pressure generated by the negative pressure fan is concentrated on the inner side of the welded cabinet through the ventilation pipe 3331 to extract the fine particles and exhaust gas entering the cabinet.

[0067] See also Figure 7 and Figure 8As shown, the elastic sealing device 6 includes a suspension rod 601 and a sealing tube 602, a sealing plate 603 is provided at the bottom of the sealing tube 602, the upper end of the suspension rod 601 is fixed to the box body 501, the lower end of the suspension rod 601 is inserted into the sealing tube 602, the suspension rod 601 is coaxial with the sealing tube 602, a limiting nut 604 is screwed into the bottom of the suspension rod 601, the limiting nut 604 slides along the inner wall of the sealing tube 602, a pipe cap 605 is screwed into the top of the sealing tube 602, the The suspension rod 601 passes through the pipe cap 605, and the pipe cap 605 limits the upward movement of the limit nut 604. A spring 606 is installed in the sealing tube 602. Under the action of the spring 606 and gravity, the sealing plate 603 enters the pipe 551 and forms a seal for the pipe 551. A conical force part 607 is processed on the outer wall of the sealing tube 602, and the diameter of the force part 607 gradually decreases upward, and the force part 607 cooperates with the passive sealing device 7.

[0068] In the above technical solution, the pipe 551 is sealed by the sealing plate 603. After the ventilation pipe 3331 is inserted upward, the upper end of the ventilation pipe 3331 presses against the sealing plate 603, and pushes the sealing plate 603 upward out of the pipe 551, and at the same time, a part of the ventilation groove 3333 is exposed above the pipe 551. The outer wall of the ventilation pipe 3331 and the inner part of the pipe 551 are spaced less than 0.2 mm, so that the negative pressure generated by the negative pressure fan during operation can absorb the exhaust gas and particulate matter inside the cabinet after welding through the ventilation pipe 3331.

[0069] See also Figure 8 , Fig. 9 and Fig.10As shown, the passive sealing device 7 includes a guide plate 701 and a sealing rod 702. A guide hole 703 is processed on the plate surface of the guide plate 701, and a guide block 704 is processed on the hole wall of the guide hole 703. The sealing rod 702 passes through the guide hole 703 and corresponds to the air duct 511. A guide groove 705 is processed on the rod body of the sealing rod 702, and the guide groove 705 passes in a direction away from the air duct 511. A truncated cone-shaped guide part 704 is processed at one end of the sealing rod 702, and the guide part 704 corresponds to the air duct 511. One or more elastic sealing rings 755 are clamped on the sealing rod 702, and the elastic sealing ring 755 forms a seal for the sealing tube 511. A first limiting ring 706 and a second limiting ring 707 are installed on the sealing rod 702. 07, the first limiting ring 706 and the second limiting ring 707 are respectively located on both sides of the guide plate 701, and a second spring 708 is sleeved on the sealing rod 702, and the second spring 708 acts between the guide plate 701 and the second limiting ring 707. Under the action of the second spring 708, the sealing rod 702 is displaced in the direction away from the air duct 511, and the first limiting ring 706 limits the displacement of the sealing rod 702. A pulley seat 709 is welded to the end of the sealing rod 702 away from the guide part 704, and a force pulley 710 is rotatably installed through the pulley seat 709; the force-working part 607 cooperates with the force pulley 710 after moving upward, and the force pulley 701 pushes the sealing rod 702 to be inserted into the air duct 511 after being subjected to force.

[0070] In the above technical solution, the force-bearing pulley 710 is pushed upward by the force-working part 607 , so that the sealing rod 702 is displaced toward the direction of the air duct 511 , thereby completing the sealing of the air duct 511 .

[0071] After the air duct 511 is closed, the negative pressure generated by the negative pressure fan can be concentrated on the ventilation pipe 3331, increasing the suction force at the ventilation pipe 3331, so as to effectively absorb the particulate matter and waste smoke located inside the cabinet.

[0072] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A sheet metal welding fixture, characterized in that: The invention comprises a driving unit (1), and a lower clamp structure (2) driven to slide by the driving unit (1), the lower clamp structure (2) being matched with an upper clamp structure (3), the sliding of the upper clamp structure (3) being guided by the driving unit (1), an electric telescopic rod (4) being installed between the lower clamp structure (2) and the upper clamp structure (3), the bottom of the electric telescopic rod (4) being fixed to the lower clamp structure (2), and the telescopic end of the electric telescopic rod (4) being fixed to the upper clamp structure (3); and a box structure (5), wherein the lower clamp structure (2) and the upper clamp structure (3) are driven by the driving unit (1) to ascend to the interior of the box structure (5); a welding gun is inserted through the four corners of the box structure (5), the cabinet to be welded contacts the welding gun during the ascending process, and waste smoke generated during the welding process is exhausted through the box structure (5).

2. The sheet metal welding fixture according to claim 1, characterized in that: The drive unit (1) comprises an equipment box (101), a top plate (102), a guide rod (103), a reduction motor (104) and a lead screw (105); the guide rod (103) is fixedly installed between the equipment box (101) and the top plate (102); two or more guide rods (103) are arranged in parallel; a bearing is provided between the upper end of the lead screw (105) and the top plate (102); a motor bracket (106) is installed in the equipment box (101); the reduction motor (104) is fixed to the bottom of the motor bracket (106); the output end of the reduction motor (104) is connected to the lead screw (105); A first bearing is provided between the output end of the reduction motor (104) and the motor bracket (106); the lower clamp structure (2) is provided to cooperate with the guide rod (103) and the lead screw (105); the upper clamp structure (3) is provided to cooperate with the guide rod (103); and the lead screw (105) passes through the upper clamp structure (3); a wire box (107) is installed inside the device box (101); a folding tube (108) is installed between the lower clamp structure (2) and the device box (101); the folding tube (108) corresponds to the wire box (107); and a wire harness connected to the electric telescopic rod (4) passes through the folding tube (108).

3. The sheet metal welding fixture according to claim 1, characterized in that: The lower clamp structure (2) comprises a lower base plate (201) and a lower bracket (202); a lower clamp seat (203) is arranged on the top of the lower base plate (201) in a rectangular shape; a lower slot (204) for inserting a cabinet board is arranged on the top of the lower clamp seat (203); a lower connecting plate is arranged between the lower bracket (202) and the lower base plate (201); a first linear bearing (205) is installed on the plate surface of the lower bracket (202); and the guide rod (103) cooperates with the guide rod (103) to form a first linear bearing (205). The first linear bearing (205) is provided with a lead screw nut (206) on the plate surface of the lower bracket (202), and the lead screw (105) cooperates with the lead screw nut (206); the electric telescopic rod (4) is fixedly installed on the top of the lower bracket (202), and a threading hole (207) corresponding to the folding tube (108) is opened on the plate surface of the lower bracket (202), and the folding tube (108) is connected to the bottom of the lower bracket (202).

4. The sheet metal welding fixture according to claim 3, characterized in that: The upper clamp structure (3) comprises an upper top plate (301) and an upper bracket (302); the bottom of the upper top plate (301) is provided with an upper clamp seat (303) corresponding to the lower clamp seat (203) in a rectangular shape; the upper clamp seat (303) has an upper slot (304) corresponding to the lower slot (204); the welded cabinet plate is clamped between the lower slot (204) and the upper slot (304); an upper connecting plate (333) is provided between the upper top plate (301) and the upper bracket (302); a second linear bearing (305) cooperating with the guide rod (103) is installed at the upper bracket (302); a through hole (306) passing through the lead screw (105) is provided on the plate surface of the upper bracket (302); the telescopic end of the electric telescopic rod (4) is fixed to the upper bracket (302).

5. The sheet metal welding fixture according to claim 4, characterized in that: The box structure (5) comprises a box (501), the lower end of the box (501) has an opening, a slide groove (502) is provided at the rear end of the box (501), the slide groove (502) penetrates downwardly through the box (501), the box (501) is fixed to the bottom of the top plate (102), the lower bottom plate (201) and the upper top plate (301) enter the box (501) through the opening, and the lower connecting plate and the upper connecting plate (333) enter along the slide groove (502); the four corners of the box (501) are processed with open grooves (503) near the bottom, and the welding gun is inserted through the open groove (503).

6. The sheet metal welding fixture according to claim 5, characterized in that: A partition (504) is welded at the inner upper position of the box body (501), and a negative pressure chamber (505) is formed at the upper end of the partition (504). A ventilation hole (506) is provided at the front end surface of the box body (501), and a negative pressure fan (507) is installed at the front end surface of the box body (501) at a position corresponding to the ventilation hole (506), and the air inlet end of the negative pressure fan (507) corresponds to the ventilation hole (506). An exhaust pipe (508) is installed at the air outlet end of the negative pressure fan (507); a connecting pipe (509) is provided on the left and right sides of the box body (501) and between two adjacent opening grooves (503); a pipe cover (510) is installed at the pipe mouth of the connecting pipe (509); an air duct (511) is connected between the connecting pipe (509) and the negative pressure chamber (505); and the air duct (511) is inserted into the negative pressure chamber (505).

7. The sheet metal welding fixture according to claim 6, characterized in that: A vent pipe (3331) is installed at the middle position of the upper top plate (301), the upper end of the vent pipe (3331) is processed to form a conical guide portion (3332), and a vent groove (3333) is opened on the outer wall of the vent pipe (3331); a pipe (551) is processed on the plate surface of the partition (504), and the pipe (551) corresponds to the vent pipe (3331); an elastic sealing device (6) is installed on the inner top of the box body (501), and the elastic sealing device (6) closes the pipe (551). When the upper top plate (301) moves up to the limit position, the vent pipe (3331) is opened. The air pipe (3331) pushes the elastic sealing device (6) upward, and the ventilation groove (3333) enters into the negative pressure chamber (505); a passive sealing device (7) is installed on the top of the box body (501), and the passive sealing device (7) cooperates with the air pipe (511). Under normal circumstances, the air pipe (511) is in a conducting state. When the elastic sealing device (6) is compressed under the action of the ventilation pipe (3331), the elastic sealing device (6) drives the passive sealing device (7) to move. When it moves to the extreme position, the passive sealing device (7) seals the air pipe (511).

8. The sheet metal welding fixture according to claim 6, characterized in that: The elastic sealing device (6) comprises a suspension rod (601) and a sealing tube (602). A sealing plate (603) is provided at the bottom of the sealing tube (602). The upper end of the suspension rod (601) is fixed to the box body (501). The lower end of the suspension rod (601) is inserted into the sealing tube (602). The suspension rod (601) and the sealing tube (602) are coaxial. A limiting nut (604) is screwed into the bottom of the suspension rod (601). The limiting nut (604) slides along the inner wall of the sealing tube (602). A pipe cap (605) is screwed into the top of the sealing tube (602). The suspension rod (601) passes through the pipe cap (605), and the pipe cap (605) limits the upward movement of the limit nut (604). A spring (606) is installed in the sealing tube (602). Under the action of the spring (606) and gravity, the sealing plate (603) enters the pipe (551) and forms a seal for the pipe (551); a conical force part (607) is processed on the outer wall of the sealing tube (602), and the diameter of the force part (607) gradually decreases upward, and the force part (607) cooperates with the passive sealing device (7).

9. The sheet metal welding fixture according to claim 8, characterized in that: The passive sealing device (7) comprises a guide plate (701) and a sealing rod (702); a guide hole (703) is machined on the plate surface of the guide plate (701); a guide block (704) is machined on the hole wall of the guide hole (703); the sealing rod (702) passes through the guide hole (703) and corresponds to the air duct (511); a guide groove (705) is machined on the rod body of the sealing rod (702); the guide groove (705) is directed away from the air duct (511); The sealing rod (702) is provided with a truncated cone-shaped guide portion (704) at one end thereof, the guide portion (704) corresponding to the air duct (511), one or more elastic sealing rings (755) are clamped on the sealing rod (702), the elastic sealing rings (755) form a seal for the sealing tube (511), a first limiting ring (706) and a second limiting ring (707) are installed on the sealing rod (702), the first limiting ring (706) and the second limiting ring (707) are respectively located on both sides of the guide plate (701), a second spring (708) is sleeved on the sealing rod (702), the second spring (708) acts between the guide plate (701) and the second limiting ring (707), under the action of the second spring (708), the sealing rod (702) moves in a direction away from the air duct (511), and the first limiting ring (706) and the second limiting ring (707) are respectively located on both sides of the guide plate (701), and a second spring (708) is sleeved on the sealing rod (702), the second spring (708) acts between the guide plate (701) and the second limiting ring (707), under the action of the second spring (708), the sealing rod (702) moves in a direction away from the air duct (511), and the second limiting ring (706) and the second limiting ring (707) are respectively arranged on the sealing rod (702). A limiting ring (706) limits the displacement of the sealing rod (702); a pulley seat (709) is welded to the end of the sealing rod (702) away from the guiding part (704); a force pulley (710) is rotatably installed through the pulley seat (709); the force-generating part (607) moves upward to cooperate with the force pulley (710), and the force pulley (701) pushes the sealing rod (702) to be inserted into the air duct (511) after being subjected to force.

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