Fixture for screw production and machining

Abstract

The utility model provides a fixture for producing and processing screws, which relates to the technical field of screw production and comprises a three-jaw chuck, a mounting frame is mounted on the three-jaw chuck, a clamping mechanism for fixing workpieces is arranged on the mounting frame, clamping jaws are arranged on the clamping mechanism, the mounting frame comprises a fixing cylinder, and the fixing cylinder is fixed on the mounting frame. A U-shaped frame is fixed to one end of the fixing cylinder, the clamping mechanism comprises a two-way lead screw rotationally connected to the side face of the fixing cylinder through a bearing, and the side face of the two-way lead screw is in threaded connection with two symmetrical lead screw sliding blocks. According to the clamp for screw production and machining, the guide rod can slide on the moving rod through the moving block, then the guide rod drives the guide block and the sliding base to slide on the sliding rod, and the distance between the clamping jaw fixed to the guide block and the clamping jaw fixed to the lead screw sliding block is adjusted; therefore, the contact area between the clamping jaw and the workpiece can be adjusted, and the clamping jaw can avoid machined threads.

Description

Technical Field

[0001] The utility model relates to a fixture, in particular to a fixture for screw production and processing, belonging to the technical field of screw production. Background Technique

[0002] During the production process of screws, thread rolling and cutting are required for the screws. Therefore, fixing the workpiece is an essential step in screw production and processing, which can ensure the machining accuracy, efficiency and safety, extend the service life of the equipment, and ensure the consistency and quality of the products.

[0003] A fixture for screw production and processing disclosed in the Chinese Patent Publication Specification CN211759913U. When in use, the workpiece is clamped in the three-jaw chuck, the workpiece is arranged in the clearance hole, the left end of the workpiece abuts against the stepped groove, and the driving device drives the movable plate to move, so that the clamping seat presses tightly against the workpiece, so that the workpiece is not easy to shake during the processing process; when processing a double-headed screw, the unprocessed area can be clamped in the three-jaw chuck, thus avoiding damage to the thread.

[0004] The above-mentioned fixture clamps the unprocessed area in the three-jaw chuck, thus avoiding damage to the thread. When fixing a double-headed screw, if the distance between the threads at both ends of the double-headed screw is too small, fixing the double-headed screw by the three-jaw chuck will damage the thread. For this reason, we provide a fixture for screw production and processing. Summary of the Utility Model

[0005] The utility model provides a fixture for screw production and processing, which can adjust the contact area between the fixture and the workpiece to avoid damaging the processed thread.

[0006] The utility model is realized by the following technical solutions: it includes a three-jaw chuck, an installation frame is installed on the three-jaw chuck, a clamping mechanism for fixing the workpiece is arranged on the installation frame, a clamping jaw is arranged on the clamping mechanism, the installation frame includes a fixed cylinder, and a U-shaped frame is fixed at one end of the fixed cylinder.

[0007] The clamping mechanism includes a bidirectional lead screw rotatably connected to the side of the fixed cylinder through a bearing, two symmetrically arranged lead screw sliders are threadedly connected to the side of the bidirectional lead screw, sliding rods are fixed to the bottom surfaces of the two lead screw sliders, two symmetrically arranged moving rods are fixed to the side of the fixed cylinder, moving blocks are slidably connected to the sides of the two moving rods, guide rods are fixed to the sides of the two moving blocks close to each other, two symmetrically arranged guide blocks are slidably connected to the side of the guide rod, and sliding seats slidably connected to the side of the sliding rod are fixed to the bottom surfaces of the two guide blocks.

[0008] The clamping claw comprises a vertical plate fixed on the top surface of the guide block, a clamping block is fixed on the side surface of the vertical plate, and an arc-shaped groove is formed on the side surface of the clamping block.

[0009] Specifically, a stopper is fixed to one end of the slide rod away from the lead screw slider, and the outer contour of the stopper is cylindrical. The stopper can limit the slide seat to prevent it from being separated from the limit of the slide rod.

[0010] Specifically, one end of the bidirectional lead screw extends to the outside of the fixed cylinder, and a rotating rod is fixed to the end of the bidirectional lead screw extending to the outside of the fixed cylinder. The rotating rod is provided to facilitate the rotation of the bidirectional lead screw.

[0011] Furthermore, a rubber pad is fixed to the side of the clamping block with the arc groove, and the rubber pad can buffer the clamping force on the workpiece, avoid the clamping block from directly contacting the workpiece surface, and thus prevent scratches and indentations on the workpiece surface.

[0012] Specifically, a limit assembly is provided at one end of the rotating rod extending to the outside of the fixed cylinder. The limit assembly includes a ratchet fixed to the side of the bidirectional lead screw. The side of the fixed cylinder is rotatably connected to the limit block.

[0013] Furthermore, a mounting plate is fixed to the side of the fixing tube, and a tension spring is rotatably connected between the mounting plate and the limiting block.

[0014] Specifically, a toggle rod is fixed to the side of the ratchet wheel, and the outer contour of the toggle rod is cylindrical. The toggle rod is provided to facilitate the toggle limit block, thereby enabling the bidirectional lead screw to be reversed.

[0015] The utility model provides a clamp for screw production and processing, which has the following beneficial effects:

[0016] 1. The guide rod of the fixture for screw production and processing can slide on the moving rod through the moving block, and then the guide block and the slide seat are driven to slide on the slide rod through the guide rod, thereby realizing the adjustment of the distance between the clamping jaw fixed on the guide block and the clamping jaw fixed on the lead screw slider, that is, realizing the adjustment of the contact area between the clamping jaw and the workpiece, so that the clamping jaw can avoid the processed thread. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 It is a three-dimensional structural schematic diagram of the mounting frame and the clamping mechanism of the utility model;

[0019] Figure 3 For the utility model Figure 2 A schematic diagram of the structure enlargement in the middle;

[0020] Figure 4 For the present utility model Figure 1 Schematic enlarged view of the structure at position B in

[0021] Figure 5 For the present utility model Figure 2 Schematic enlarged view of the structure at position C in

[0022] Explanation of reference numerals in the drawings

[0023] 1. Three-jaw chuck

[0024] 2. Mounting bracket; 201. Fixed cylinder; 202. U-shaped bracket

[0025] 3. Clamping mechanism; 301. Bi-directional lead screw; 302. Lead screw slider; 303. Slide bar; 304. Moving rod; 305. Moving block; 306. Guide rod; 307. Guide block; 3071. Slide seat; 308. Stop block; 309. Rotating rod

[0026] 4. Jaw; 401. Vertical plate; 402. Clamping block; 403. Rubber pad

[0027] 5. Limit component; 501. Ratchet; 502. Limit block; 503. Mounting plate; 504. Tension spring; 505. Poking rod Detailed implementation manners

[0028] Please refer to Figures 1 to 5 , the embodiment of the present utility model provides a fixture for screw production and processing, including a three-jaw chuck 1, the three-jaw chuck 1 is installed on a machine tool, and a mounting bracket 2 is installed on the three-jaw chuck 1. The mounting bracket 2 includes a fixed cylinder 201, the fixed cylinder 201 is fixed on the three-jaw chuck 1, and a U-shaped bracket 202 is fixed at one end of the fixed cylinder 201.

[0029] Please pay special attention to refer to Figure 2 , Figure 3 and Figure 5 , a clamping mechanism 3 for fixing a workpiece is arranged on the mounting bracket 2. The clamping mechanism 3 includes a bi-directional lead screw 301 rotatably connected to the side of the fixed cylinder 201 through a bearing. Two symmetrically arranged lead screw sliders 302 are threadedly connected to the side of the bi-directional lead screw 301. The bottom surfaces of the two lead screw sliders 302 are both fixed with slide bars 303. Two symmetrically arranged moving rods 304 are fixed to the side of the fixed cylinder 201. The sides of the two moving rods 304 are both slidably connected with moving blocks 305. A guide rod 306 is fixed to the side of the two moving blocks 305 close to each other. Two symmetrically arranged guide blocks 307 are slidably connected to the side of the guide rod 306. The bottom surfaces of the two guide blocks 307 are both fixed with slide seats 3071 slidably connected to the side of the slide bar 303.

[0030] Specifically, the screw slider 302 is limited by the slide seat 3071, the guide block 307, the guide rod 306, the moving block 305 and the moving rod 304 through the slide rod 303. When the bidirectional screw 301 rotates, the two screw sliders 302 will move toward each other, and then the two screw sliders 302 will respectively drive the vertical plate 401, the clamping block 402 and the rubber pad 403 to approach each other to achieve clamping of the workpiece.

[0031] Furthermore, the guide rod 306 can slide on the moving rod 304 through the moving block 305. When the guide rod 306 slides, the guide rod 306 will also drive the guide block 307 and the slide seat 3071 on the bottom of the guide block 307 to slide on the side of the slide rod 303. The movement of the guide block 307 will drive the vertical plate 401, the clamping block 402 and the rubber pad 403 fixed on its top surface to move, thereby changing the distance between the vertical plate 401, the clamping block 402 and the rubber pad 403 on the top surface of the lead screw slider 302 and the vertical plate 401, the clamping block 402 and the rubber pad 403 on the top surface of the guide block 307. When the distance between the threads at both ends of the double-headed screw is too small, it can be adjusted in the above manner to avoid damaging the processed threads.

[0032] A stopper 308 is fixed to one end of the slide rod 303 away from the screw slider 302. The outer contour of the stopper 308 is cylindrical. The stopper 308 is set to limit the slide seat 3071 to prevent it from being separated from the limit of the slide rod 303. One end of the bidirectional screw 301 extends to the outside of the fixed cylinder 201. A rotating rod 309 is fixed to the end of the bidirectional screw 301 extending to the outside of the fixed cylinder 201. The rotating rod 309 is set to facilitate the rotation of the bidirectional screw 301, and it is simple and convenient to use.

[0033] Please refer to Figure 2 and Figure 5 A clamping jaw 4 is provided on the clamping mechanism 3, and the clamping jaw 4 includes a vertical plate 401 fixed on the top surface of the guide block 307, a clamping block 402 is fixed on the side of the vertical plate 401, an arc-shaped groove is provided on the side of the clamping block 402, and a rubber pad 403 is fixed on the side of the clamping block 402 with the arc-shaped groove, and the rubber pad 403 can buffer the clamping force on the workpiece, prevent the clamping block 402 from directly contacting the workpiece surface, thereby preventing scratches and indentations on the workpiece surface.

[0034] Please refer to Figure 1 and Figure 4A limit assembly 5 is provided at one end of the rotating rod 309 extending to the outside of the fixed cylinder 201. The limit assembly 5 includes a ratchet 501 fixed to the side of the bidirectional lead screw 301. The side of the fixed cylinder 201 is rotatably connected to the limit block 502. A mounting plate 503 is fixed to the side of the fixed cylinder 201. A tension spring 504 is rotatably connected between the mounting plate 503 and the limit block 502. A toggle rod 505 is fixed to the side of the ratchet 501. The outer contour of the toggle rod 505 is cylindrical. The toggle rod 505 is provided to facilitate toggling the limit block 502, thereby enabling the bidirectional lead screw 301 to be reversed.

[0035] Specifically, the ratchet 501 and the limit block 502 cooperate to make the bidirectional screw 301 rotate in only one direction, so that the bidirectional screw 301 maintains its position in the absence of external force, preventing the bidirectional screw 301 from rotating or loosening when subjected to an external load. When the workpiece needs to be disassembled, the limit block 502 is moved by the toggle rod 505. At this time, the bidirectional screw 301 can drive the ratchet 501 to rotate in the opposite direction to disassemble the workpiece.

[0036] Working principle: First, the bidirectional screw 301 is rotated by the rotating rod 309. The rotation of the bidirectional screw 301 will drive the two limited screw sliders 302 to move toward each other, and the workpiece is clamped by the two screw sliders 302, the vertical plate 401 and the clamping block 402 that are close to each other. If the distance between the threads at both ends of the double-headed screw to be processed is too small, the sliding guide rod 306 is made to slide on the moving rod 304, and then the guide block 307 and the slide seat 3071 are driven by the guide rod 306 to slide on the slide rod 303, thereby realizing the adjustment of the distance between the clamping jaw 4 fixed on the guide block 307 and the clamping jaw 4 fixed on the screw slider 302, that is, realizing the adjustment of the contact area between the clamping jaw 4 and the workpiece, so that the clamping jaw 4 can avoid the processed threads.

[0037] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A fixture for screw production and processing, comprising a three-jaw chuck (1), characterized in that: The three-jaw chuck (1) is provided with a mounting frame (2), the mounting frame (2) is provided with a clamping mechanism (3) for fixing a workpiece, and the clamping mechanism (3) is provided with a clamping jaw (4); The mounting frame (2) comprises a fixing tube (201), and a U-shaped frame (202) is fixed to one end of the fixing tube (201); The clamping mechanism (3) comprises a bidirectional lead screw (301) rotatably connected to the side of the fixed cylinder (201) through a bearing, the side of the bidirectional lead screw (301) is threadedly connected to two symmetrical lead screw sliders (302), the bottom surfaces of the two lead screw sliders (302) are fixed with sliding rods (303), the side of the fixed cylinder (201) is fixed with two symmetrical moving rods (304), the sides of the two moving rods (304) are slidably connected to moving blocks (305), a guide rod (306) is fixed on the side of the two moving blocks (305) close to each other, the side of the guide rod (306) is slidably connected to two symmetrical guide blocks (307), and the bottom surfaces of the two guide blocks (307) are fixed with sliding seats (3071) slidably connected to the side of the sliding rod (303); The clamping jaw (4) comprises a vertical plate (401) fixed on the top surface of the guide block (307), a clamping block (402) is fixed on the side of the vertical plate (401), and an arc-shaped groove is formed on the side of the clamping block (402).

2. A fixture for screw production and processing according to claim 1, characterized in that: A stopper (308) is fixed to one end of the slide rod (303) away from the lead screw slider (302), and the outer contour of the stopper (308) is cylindrical.

3. A fixture for screw production and processing according to claim 1, characterized in that: One end of the bidirectional lead screw (301) extends to the outside of the fixed cylinder (201), and a rotating rod (309) is fixed to the end of the bidirectional lead screw (301) extending to the outside of the fixed cylinder (201).

4. The fixture for screw production and processing according to claim 1, characterized in that: A rubber pad (403) is fixed on the side of the clamping block (402) where the arc-shaped groove is formed.

5. The fixture for producing and processing screws according to claim 3, characterized in that: A limit assembly (5) is provided at one end of the rotating rod (309) extending to the outside of the fixed cylinder (201), and the limit assembly (5) comprises a ratchet (501) fixed to the side of the bidirectional lead screw (301), and the side of the fixed cylinder (201) is rotatably connected to a limit block (502).

6. A fixture for screw production and processing according to claim 5, characterized in that: A mounting plate (503) is fixed to the side of the fixing cylinder (201), and a tension spring (504) is rotatably connected between the mounting plate (503) and the limiting block (502).

7. The fixture for screw production and processing according to claim 5, characterized in that: A toggle rod (505) is fixed to the side of the ratchet wheel (501), and the outer contour of the toggle rod (505) is cylindrical.

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