A device for preventing parts from falling off and for preventing empty welding

Abstract

The application discloses a device for preventing parts from falling off and air welding, and particularly relates to the technical field of jigs, which comprises a frame, chain transmission structures are arranged on the front and rear sides of the outer surface of the frame, the lower side of the outer surface of the chain transmission structure is fixedly connected with the inner surface of a connecting block, and one end of the outer surface of the connecting block is fixedly connected with one side of the outer surface of an I-shaped plate. Through cooperation of the elastic structure and the fixing structure, the parts can keep overall stability after being clamped and fixed by the fixing structure, part displacement is avoided, the inclined plane plate is separated from the roller through displacement of the supporting plate, at the moment, the elastic structure can drive the two fixing frames to move close to each other, so that the two parts can keep close contact under the resetting force of the elastic structure, air welding is avoided, and the quality of part welding is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of jigs, and more particularly to a device for preventing parts from falling off and preventing empty welding. Background Art

[0002] Welding fixtures are designed and manufactured based on the dimensional coordinate points of the welded parts that are calibrated during the design of the welding product.

[0003] In the prior art, when welding two parts, it is generally necessary to first use a jig to fix the position of one of the parts, and then bring the part to be connected into contact with the current part and use the jig to fix it again. However, it is difficult to ensure close contact between the two parts during the second fixation. Therefore, due to the certain distance between the two parts during welding, empty welds are prone to occur. At the same time, the loosening of the jig due to other external forces during the welding process will also affect the welding accuracy. Moreover, the entire operation is relatively cumbersome, and a long time will be wasted in the preparation work before welding and the processing work after welding. In addition, the welded parts cannot be cooled quickly, and it is easy to cause burns to personnel when taking them out. Therefore, it is of great significance to study a new device to prevent parts from falling off and empty welds to solve the above problems. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a device to prevent parts from falling off and empty welding. The technical problem to be solved by the present invention is: in the prior art, it is difficult to ensure close contact between the two parts during the second fixation, so due to a certain distance between the two parts during welding, empty welding is prone to occur. At the same time, the loosening of the jig due to other external forces during the welding process will also affect the welding accuracy, and the whole operation is relatively cumbersome. A long time will be wasted in the preparation work before welding and the processing work after welding. In addition, the welded parts cannot be cooled quickly, and it is easy to cause burns to personnel when taking them out.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a device for preventing parts from falling off and empty welding, comprising a frame, wherein chain transmission structures are provided on the front and rear sides of the outer surface of the frame, the lower side of the outer surface of the chain transmission structure is fixedly connected to the inner surface of the connecting block, one end of the outer surface of the connecting block is fixedly connected to one side of the outer surface of the I-shaped plate, the outer surface of the I-shaped plate is slidably connected in the through hole, the through hole is provided on one side of the outer surface of the movable plate, the lower side of the outer surface of the movable plate is clamped with a sliding rod, the sliding rod is slidably connected in the concave groove, the concave groove is provided on the front side of the outer surface of the frame, and the upper side of the outer surface of the chain transmission structure is fixedly connected to a fixed block.

[0006] One end of the fixing block is passed through and fixedly connected to the guide plate, and the upper surface of the guide plate is fixedly connected to a fixing plate, and both sides of the outer surfaces of the two fixing plates and the top of the outer surfaces of the two movable plates are respectively fixedly connected to the outer surfaces of the two support plates, and the top of the outer surfaces of the support plates are respectively fixedly connected to the two ends of the two elastic structures. Two fixing brackets are provided on the tops of the outer surfaces of the two elastic structures, and fixing structures are provided on both sides of the fixing brackets, and the bottom of the outer surface of the fixing bracket is fixedly connected to one end of the outer surface of the ball rod, and the two ball rods on the right side are respectively overlapped with both sides of the outer surface of the inclined panel, and the bottom of the outer surface of the inclined panel is fixedly connected to the top of the outer surface of the frame, and the top of the outer surface of the support plate is fixedly connected to the bottom of the outer surfaces of the four convex blocks.

[0007] As a further solution of the present invention: the elastic structure includes a support rod, both ends of the support rod are fixedly connected to the top of the outer surface of the support plate, the outer surface of the support rod is slidably connected to two sleeves, the outer surfaces of the two sleeves are respectively fixedly connected to the bottom of the outer surfaces of the two fixing frames, the two sides of the outer surfaces of the two sleeves are respectively fixedly connected to one end of the two second springs, and the other ends of the two second springs are respectively fixedly connected to the two sides of the outer surface of the support rod.

[0008] As a further solution of the present invention: the fixing structure includes a splint, which is fixedly connected to one end of the threaded cylinder, the lower surface of the splint overlaps the upper surface of the fixing frame, one side of the outer surface of the fixing frame is fixedly connected to one end of the two telescopic rods, and the other end of the two telescopic rods is fixedly connected to one side of the outer surface of the splint.

[0009] As a further solution of the present invention: the inner surface of the threaded barrel is threadedly connected to a screw, the outer surface of the screw is rotatably connected to the inside of the bearing, the bearing is clamped on one side of the outer surface of the fixing frame, one end of the outer surface of the screw is fixedly connected to one side of the outer surface of the handle, the outer surface of the screw is fixedly connected to the inner surface of the cylindrical barrel, and the outer surface of the cylindrical barrel is provided with a plurality of positioning grooves.

[0010] As a further solution of the present invention: an annular frame is provided on the outside of the cylindrical tube, the upper side of the inner wall of the annular frame is fixedly connected to the top of the outer surface of the positioning block, the front and rear sides of the outer surface of the annular frame are respectively fixedly connected to one side of the outer surface of the two front support blocks and the two rear support blocks, and the opposite surfaces of the two front support blocks and the opposite surfaces of the two rear support blocks are respectively fixedly connected to the two ends of the two first springs.

[0011] As a further solution of the present invention: the outer surface of the annular frame is slidingly connected to the inner wall of the connecting plate, one side of the outer surface of the connecting plate is fixedly connected to one side of the outer surface of the fixed frame, the bottom of the outer surface of the annular frame is fixedly connected to the top of the upper surface of the roller, and the bottoms of the outer surfaces of the two rollers on the right side are respectively overlapped with the bottoms of the outer surfaces of the two convex blocks on the right side.

[0012] As a further solution of the present invention: the left and right sides of the inner wall of the frame are fixedly connected to the two ends of the outer surfaces of the two guide rods respectively, the two guide rods are respectively located on the front and back sides of the inner wall of the frame, and the outer surfaces of the two guide rods are respectively slidably connected to the inner walls of the two I-shaped plates.

[0013] As a further solution of the present invention: the outer surface of the frame is provided with two guide grooves, the two guide grooves are respectively located at the front and rear sides of the outer surface of the frame, and the two guide plates are respectively slidably connected in the two guide grooves.

[0014] The beneficial effects of the present invention are:

[0015] 1. The present invention cooperates with the elastic structure and the fixed structure. After the parts are clamped and fixed by the fixed structure, the parts can maintain overall stability and avoid displacement of the parts. Then, the inclined plate and the roller are separated by the displacement of the support plate. At this time, the elastic structure can drive the fixing frames on both sides to move closer to each other. Then, the two parts can be kept in close contact under the action of the resetting force of the elastic structure, avoiding the formation of gaps, thereby effectively preventing the problem of empty welding and ensuring the quality of part welding.

[0016] 2. The present invention cooperates with the chain transmission structure, the movable plate, the slide bar, the concave groove and the guide plate. The chain transmission structure can control the movable plate and the guide plate to move, so that the slide bar descends along the concave groove, thereby allowing the two support plates to move alternately, so that the two support plates can achieve the purpose of alternate position replacement. Therefore, while welding parts on the left side, parts can also be placed, clamped and positioned on the right side, thereby avoiding processing idle times, effectively saving time, and enabling parts to be processed continuously.

[0017] 3. The present invention cooperates with the first spring, the annular frame, the positioning block, the roller and the positioning block. When the roller is separated from the convex block, the elastic force of the first spring drives the annular frame to reset downward, so that the positioning block is stuck in the positioning groove, and then the position of the screw can be locked by the cylindrical tube to prevent the screw from rotating due to external force, thereby avoiding the problem of loose clamping of the parts and preventing the parts from falling off, thereby ensuring the normal processing of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the support plate of the present invention;

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the elastic structure of the present invention;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the fixing frame of the present invention;

[0022] Figure 5 It is a schematic cross-sectional structure diagram of a three-dimensional fixing frame of the present invention;

[0023] Figure 6 It is a schematic structural diagram of the three-dimensional frame of the present invention;

[0024] Figure 7 This is a schematic diagram of the three-dimensional structure of the framework of the present invention when viewed from above;

[0025] In the figure: 1 frame, 2 chain transmission structure, 3 concave groove, 4 movable plate, 5 connecting block, 6 fixed structure, 61 splint, 62 threaded cylinder, 63 telescopic rod, 64 connecting plate, 65 support block, 66 roller, 67 annular frame, 68 bearing, 69 positioning groove, 610 positioning block, 611 screw, 612 first spring, 613 cylindrical tube, 614 handle, 7 support plate, 8 elastic structure, 81 support rod, 82 sleeve, 83 second spring, 9 guide plate, 10 guide rod, 11 fixed frame, 12 ball rod, 13 convex block, 14 slide rod, 15 I-type plate, 16 guide groove, 17 fixed plate, 18 fixed block, 19 inclined plate, 20 through hole. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] like Figure 1-7As shown, the present invention provides a device for preventing parts from falling off and empty welding, including a frame 1, and chain transmission structures 2 are provided on the front and rear sides of the outer surface of the frame 1. By providing the chain transmission structure 2, long-distance transmission of power can be achieved through the chain transmission structure 2, thereby facilitating the control of the movement of the two movable plates 4 and the guide plate 9. The lower side of the outer surface of the chain transmission structure 2 is fixedly connected to the inner surface of the connecting block 5, and one end of the outer surface of the connecting block 5 is fixedly connected to one side of the outer surface of the I-shaped plate 15. The outer surface of the I-shaped plate 15 is slidably connected in the through hole 20. By providing the I-shaped plate 15 and the through hole 20, and the through hole 20 can provide a movable space for the I-shaped plate 15, the movable plate 4 can be smoothly moved up and down. The movable plate 4 is movable, and the I-type plate 15 is embedded in the surface of the movable plate 4, which makes it easy to control the movable plate 4 to move left and right. The through hole 20 is opened on one side of the outer surface of the movable plate 4, and the lower side of the outer surface of the movable plate 4 is clamped with a slide bar 14, and the slide bar 14 is slidably connected in the concave groove 3. By setting the slide bar 14 and the concave groove 3, and the middle part of the concave groove 3 is concave, the slide bar 14 can smoothly pass through the inclined surface of the concave groove 3 and move downward, thereby making the movable plate 4 move downward, and further making the two support plates 7 staggered to ensure that the two support plates 7 are alternately replaced in position. The concave groove 3 is opened on the front side of the outer surface of the frame 1, and the upper side of the outer surface of the chain transmission structure 2 is fixedly connected with a fixed block 18.

[0028] One end of the fixed block 18 is passed through and fixedly connected to the guide plate 9. The upper surface of the guide plate 9 is fixedly connected with a fixed plate 17. By arranging the fixed plate 17 and the guide plate 9, the guide plate 9 and the fixed plate 17 can support the support plate 7. The two sides of the outer surface of the two fixed plates 17 and the top of the outer surface of the two movable plates 4 are respectively fixedly connected to the outer surfaces of the two support plates 7. The top of the outer surface of the support plate 7 is respectively fixedly connected to the two ends of the two elastic structures 8. Two fixing frames 11 are provided on the top of the outer surface of the two elastic structures 8. By arranging the fixing frames 11, the fixing frames 11 can ensure the support of the parts, thereby facilitating the placement of the parts. A fixing structure 6 is provided on both sides, and the bottom of the outer surface of the fixing frame 11 is fixedly connected to one end of the outer surface of the ball rod 12. By providing the ball rod 12, the ball rod 12 can reduce the friction between the ball rod 12 and the inclined plate 19, thereby ensuring the smooth movement of the ball rod 12. The two ball rods 12 on the right are overlapped with the two sides of the outer surface of the inclined plate 19 respectively. By providing the inclined plate 19, the inclined surface of the inclined plate 19 can squeeze the moving ball rod 12, thereby facilitating the control of the displacement of the ball rod 12. The bottom of the outer surface of the inclined plate 19 is fixedly connected to the top of the outer surface of the frame 1, and the top of the outer surface of the support plate 7 is fixedly connected to the bottom of the outer surface of the four convex blocks 13.

[0029] like Figure 3As shown, the elastic structure 8 includes a support rod 81, both ends of the support rod 81 are fixedly connected to the top of the outer surface of the support plate 7, and the outer surface of the support rod 81 is slidably connected to two sleeves 82. By arranging the support rod 81 and the sleeve 82, the support rod 81 can guide the sleeve 82. At the same time, the support rod 81 ensures that the guide cylinder slides smoothly, so that the fixed frame 11 can move smoothly. The outer surfaces of the two sleeves 82 are respectively fixedly connected to the bottom of the outer surfaces of the two fixed frames 11, and the two sides of the outer surfaces of the two sleeves 82 are respectively fixedly connected to one end of the two second springs 83. By arranging the second spring 83, the elastic force of the second spring 83 can drive the sleeve 82 to reset, thereby facilitating the control of the backward approach of the two fixed frames 11, and the elastic force of the second spring 83 can keep the two workpieces in close contact. The other ends of the two second springs 83 are respectively fixedly connected to the two sides of the outer surface of the support rod 81.

[0030] like Figure 5As shown, the fixed structure 6 includes a clamping plate 61, the clamping plate 61 is fixedly connected with one end of a threaded cylinder 62, the lower surface of the clamping plate 61 is overlapped with the upper surface of the fixed frame 11, one side of the outer surface of the fixed frame 11 is fixedly connected with one end of two telescopic rods 63, by setting the telescopic rod 63, and the telescopic rod 63 can move with the clamping plate 61, thereby ensuring the stable movement of the clamping plate 61, the other end of the two telescopic rods 63 is fixedly connected with one side of the outer surface of the clamping plate 61, the inner surface of the threaded cylinder 62 is threadedly connected with a screw rod 611, by setting the screw rod 611 and the threaded cylinder 62, the rotation of the screw rod 611 can control the threaded cylinder 62 to realize linear motion, thereby facilitating the control of the clamping plate 61 on the clamping of the part, the outer surface of the screw rod 611 is rotatably connected in the inside of the bearing 68, by setting the bearing 68, the bearing 68 can ensure the stable selection of the screw rod 611 work, the bearing 68 is clamped on one side of the outer surface of the fixed frame 11, one end of the outer surface of the screw rod 611 is fixedly connected with one side of the outer surface of the handle 614, by setting the handle 614, the handle 614 can provide an operating point for the worker, thereby facilitating the control of the work of the screw rod 611, the outer surface of the screw rod 611 is fixedly connected with the inner surface of the cylindrical cylinder 613, a plurality of positioning grooves 69 are formed in the outer surface of the cylindrical cylinder 613, by setting the positioning groove 69, thereby can provide a fixed point for the positioning block 610, the outer side of the cylindrical cylinder 613 is provided with an annular frame 67, the upper side of the inner wall of the annular frame 67 is fixedly connected with the top of the outer surface of the positioning block 610, the front and rear two sides of the outer surface of the annular frame 67 are respectively fixedly connected with one side of the outer surface of the two front support blocks 65 and the two rear support blocks 65, the opposite surfaces of the two front support blocks 65 and the opposite surfaces of the two rear support blocks 65 are respectively fixedly connected with both ends of the two first springs 612, by setting the first spring 612, the elastic force of the first spring 612 can drive the annular frame 67 to reset downward, thereby making the positioning block 610 clamped into the positioning groove 69, further can lock the position of the cylindrical cylinder 613, avoid the rotation of the screw rod 611 under stress, the outer surface of the annular frame 67 is slidingly connected with the inner wall of the connecting plate 64, by setting the connecting plate 64, the connecting plate 64 can guide the annular frame 67, thereby can ensure the smooth sliding of the annular frame 67 up and down, one side of the outer surface of the connecting plate 64 is fixedly connected with one side of the outer surface of the fixed frame 11, the bottom of the outer surface of the annular frame 67 is fixedly connected with the top of the upper surface of the roller 66, the bottoms of the outer surfaces of the two right rollers 66 are respectively overlapped with the bottoms of the outer surfaces of the two right convex blocks 13, by setting the roller 66 and the convex block 13, the roller 66 can reduce the friction between the roller 66 and the convex block 13, thereby making the roller 66 can move smoothly, at the same time, the convex surface of the convex block 13 can extrude the roller 66, thereby facilitating the control of the work of the upward movement of the annular frame 67.

[0031] As Figure 6 and Figure 7As shown, the left and right sides of the inner wall of the frame 1 are fixedly connected to the two ends of the outer surfaces of the two guide rods 10, and the two guide rods 10 are respectively located on the front and back sides of the inner wall of the frame 1. The outer surfaces of the two guide rods 10 are respectively slidably connected to the inner walls of the two I-shaped plates 15. By setting the guide rods 10, the guide rods 10 can support the I-shaped plates 15 and ensure the smooth sliding of the I-shaped plates 15. Two guide grooves 16 are provided on the outer surface of the frame 1. The two guide grooves 16 are respectively located on the front and back sides of the outer surface of the frame 1. By setting the guide plate 9 and the guide groove 16, the guide groove 16 can guide the guide plate 9, thereby ensuring the stable sliding of the guide plate 9. The two guide plates 9 are respectively slidably connected in the two guide grooves 16.

[0032] Working principle of the present invention:

[0033] S1. During processing, first place the parts to be processed on the right side, and place two of them on the surfaces of the two fixing frames 11 on the right side, then turn the handle 614 so that the handle 614 drives the screw 611 to rotate, so that the screw 611 drives the threaded barrel 62 to move, so that the threaded barrel 62 pushes the clamping plate 61 to move, so that the two clamping plates 61 are close to each other to clamp and fix the parts;

[0034] S2, then the chain transmission structure 2 can be controlled to move, so that the chain transmission structure 2 drives the connecting block 5 to move, so that the connecting block 5 drives the I-type plate 15 to move, so that the I-type plate 15 drives the slide bar 14 to move, so that the slide bar 14 moves along the concave groove 3, and at the same time the chain transmission structure 2 drives the fixed block 18 to move, so that the fixed block 18 drives the guide plate 9 to move, so that the guide plate 9 drives the fixed plate 17 to move, so that the fixed plate 17 drives the support plate 7 to move, so that the two support plates 7 are close to each other, so that the right ball rod 12 is separated from the inclined plate 19, at this time the elastic force of the second spring 83 drives the sleeve 82 to reset, so that the sleeve 82 drives the fixing frame 11 to reset, so that the two fixing frames 11 are close to each other, thereby making the two parts closely contact, and the roller 66 is separated from the convex block 13, so that the elastic force of the first spring 612 drives the annular frame 67 to reset downward, so that the annular frame 67 drives the positioning block 610 to snap into the positioning groove 69 to fix the cylindrical tube 613;

[0035] When the sliding rod 14 moves to the concave position of the concave groove 3, the I-type plate 15 slides in the through hole 20, and the movable plate 4 moves downward, so that the left support plate 7 is lowered, so that the two support plates 7 are staggered, so that the left support plate 7 moves to the left position for welding. At the same time, the sliding rod 14 moves upward along the right inclined surface of the concave groove 3, so that the ball rod 12 contacts the inclined plate 19, so that the inclined plate 19 squeezes the ball rod 12 to move, so that the ball rod 12 drives the fixing frame 11 to move, so that the two fixing frames 11 gradually move away from each other, so that the sleeve 82 drives the second spring 83 to deform, and when the roller 66 contacts the convex block 13, the roller 66 is squeezed by the convex block 13 and moves upward, so that the second spring 83 is deformed, and at the same time the annular frame 67 moves upward, so that the annular frame 67 drives the positioning block 610 to move upward, so that the positioning block 610 is separated from the positioning groove 69, and the parts can be placed again for clamping and positioning.

[0036] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense, and may refer to mechanical or electrical connections, internal communication between two components, or direct connection. "Up," "down," "left," and "right" are only used to indicate relative positional relationships. When the absolute positions of the objects being described change, the relative positional relationships may also change.

[0037] Secondly: The drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention. Other structures may refer to conventional designs. The same embodiment and different embodiments of the present invention may be combined with each other without conflict.

[0038] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for preventing parts from falling off and preventing empty welding, comprising a frame (1), characterized in that: The front and rear sides of the outer surface of the frame (1) are both provided with a chain transmission structure (2), the lower side of the outer surface of the chain transmission structure (2) is fixedly connected to the inner surface of the connecting block (5), one end of the outer surface of the connecting block (5) is fixedly connected to one side of the outer surface of the I-shaped plate (15), the outer surface of the I-shaped plate (15) is slidably connected in the through hole (20), the through hole (20) is provided on one side of the outer surface of the movable plate (4), the lower side of the outer surface of the movable plate (4) is clamped with a slide bar (14), the slide bar (14) is slidably connected in the concave groove (3), the concave groove (3) is provided on the front side of the outer surface of the frame (1), and the upper side of the outer surface of the chain transmission structure (2) is fixedly connected to a fixed block (18); One end of the fixed block (18) is fixedly connected to the guide plate (9), and the upper surface of the guide plate (9) is fixedly connected to the fixed plate (17). The two sides of the outer surface of the two fixed plates (17) and the top of the outer surface of the two movable plates (4) are respectively fixedly connected to the outer surfaces of the two support plates (7). The top of the outer surface of the support plate (7) is respectively fixedly connected to the two ends of the two elastic structures (8). Two fixing frames (11) are provided on the top of the outer surface of the two elastic structures (8). The fixing frames (11) are provided with fixing structures (6) on both sides. The bottom of the outer surface of the fixing frame (11) is fixedly connected to one end of the outer surface of the ball rod (12). The two ball rods (12) on the right are respectively fixedly connected to the inclined plate (19) are overlapped on both sides of the outer surface, the bottom of the outer surface of the inclined panel (19) is fixedly connected to the top of the outer surface of the frame (1), and the top of the outer surface of the support plate (7) is fixedly connected to the bottom of the outer surface of the four convex blocks (13); the elastic structure (8) includes a support rod (81), both ends of the support rod (81) are fixedly connected to the top of the outer surface of the support plate (7), the outer surface of the support rod (81) is slidably connected to two sleeves (82), the outer surfaces of the two sleeves (82) are respectively fixedly connected to the bottom of the outer surfaces of the two fixing frames (11), the two sides of the outer surfaces of the two sleeves (82) are respectively fixedly connected to one end of two second springs (83), and the other ends of the two second springs (83) are respectively fixedly connected. The fixing structure (6) includes a splint (61), the splint (61) is fixedly connected to one end of the threaded barrel (62), the lower surface of the splint (61) overlaps the upper surface of the fixing frame (11), one side of the outer surface of the fixing frame (11) is fixedly connected to one end of the two telescopic rods (63), and the other end of the two telescopic rods (63) is fixedly connected to one side of the outer surface of the splint (61); the inner surface of the threaded barrel (62) is threadedly connected to a screw (611), the outer surface of the screw (611) is rotatably connected to the inside of the bearing (68), the bearing (68) is clamped on one side of the outer surface of the fixing frame (11), and the outer surface of the screw (611) is fixedly connected to the inner surface of the bearing (68). One end is fixedly connected to one side of the outer surface of the turning handle (614), the outer surface of the screw rod (611) is fixedly connected to the inner surface of the cylindrical tube (613), and the outer surface of the cylindrical tube (613) is provided with a plurality of positioning grooves (69); an annular frame (67) is provided on the outer side of the cylindrical tube (613), the upper side of the inner wall of the annular frame (67) is fixedly connected to the top of the outer surface of the positioning block (610), the front and rear sides of the outer surface of the annular frame (67) are respectively fixedly connected to one side of the outer surface of the two front support blocks (65) and the two rear support blocks (65), and the opposite surfaces of the two front support blocks (65) and the opposite surfaces of the two rear support blocks (65) are respectively fixedly connected to the two ends of the two first springs (612);The outer surface of the annular frame (67) is slidably connected to the inner wall of the connecting plate (64), one side of the outer surface of the connecting plate (64) is fixedly connected to one side of the outer surface of the fixing frame (11), the bottom of the outer surface of the annular frame (67) is fixedly connected to the top of the upper surface of the roller (66), and the bottoms of the outer surfaces of the two right rollers (66) are respectively overlapped with the bottoms of the outer surfaces of the two right convex blocks (13).

2. The device for preventing parts from falling off and empty welding according to claim 1, characterized in that: The left and right sides of the inner wall of the frame (1) are fixedly connected to the two ends of the outer surfaces of the two guide rods (10), respectively. The two guide rods (10) are respectively located at the front and rear sides of the inner wall of the frame (1), and the outer surfaces of the two guide rods (10) are respectively slidably connected to the inner walls of the two I-shaped plates (15).

3. The device for preventing parts from falling off and empty welding according to claim 1, characterized in that: The outer surface of the frame (1) is provided with two guide grooves (16), the two guide grooves (16) are respectively located at the front and rear sides of the outer surface of the frame (1), and the two guide plates (9) are respectively slidably connected in the two guide grooves (16).

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