Positioning fixture for machining

Abstract

The utility model belongs to the technical field of positioning fixtures, and discloses a positioning fixture for machining, which comprises an adjustable positioning mechanism, a positioning mechanism, a positioning mechanism, a positioning mechanism and a positioning mechanism, the adjustable positioning mechanism comprises a workbench, an outer ring is arranged on the outer side of the workbench, and an upper ring groove is formed between the outer ring and the workbench at intervals; the periphery of the workbench is provided with a set of rotation adjusting assembly. The rotary adjusting assembly comprises a linkage wheel which is rotatably arranged in the upper ring groove; compared with the prior art, the adjustable positioning mechanism has the following beneficial effects that the adjustable positioning mechanism is designed, and four groups of rotary adjusting assemblies are designed in the adjustable positioning mechanism. Each set of rotation adjusting assembly is provided with a linkage wheel, and the linkage wheels can rotate along the annular grooves. By means of the design, the clamping direction of the clamping plate can be flexibly adjusted, an operator can adjust the clamping plate to the ideal clamping direction according to the specific shapes and machining requirements of different workpieces, and the adaptability of the clamp to the different workpieces is improved.

Description

Technical Field

[0001] This utility model belongs to the field of positioning fixture technology, and specifically relates to a positioning fixture for machining. Background Technology

[0002] In modern machining industries, workpiece positioning and clamping are key processes to ensure machining accuracy and product quality. Machining positioning fixtures, as specialized devices for fixing workpieces, enable the workpiece to remain fixed after positioning, preventing displacement from affecting machining.

[0003] Chinese Patent Publication No. CN218193775U, Publication Date 2023-01-03, discloses a machining positioning fixture. This utility model, through the cooperation between the base, clamping seat, turntable, fixing rope and clamping rod, enables the parts to be stably clamped and fixed when processing parts in mechanical production.

[0004] In practical applications, workpieces come in a wide variety of types, shapes, and sizes, and the positioning requirements of different processing techniques vary. However, the current patented solution relies solely on a fixed structure, which struggles to effectively secure workpieces when faced with these varying clamping requirements. When machining workpieces with irregular protrusions or recesses, attempts to change or adjust the workpiece angle before fixing it often prove ineffective. After adjusting one side of the angle, the existing fixing structure cannot provide sufficient clamping force to stabilize the workpiece, necessitating clamping the other two sides for effective positioning. However, the structures on the other two sides of the workpiece are often complex, with protrusions or other special features that must be avoided during clamping, making conventional, inconveniently adjustable positioning methods impractical. Therefore, this application proposes a positioning fixture for machining to address these problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a positioning fixture for machining. This fixture features an adjustable positioning mechanism with four sets of rotation adjustment components. Each set of rotation adjustment components is equipped with a linkage wheel that rotates along an annular groove. This design allows for flexible adjustment of the clamping direction of the clamping plate. Operators can adjust the clamping plate to the ideal clamping direction according to the specific shape and processing requirements of different workpieces, thus improving the fixture's adaptability to different workpieces. This solves the problems mentioned in the background technology.

[0006] To achieve the above objectives, this application specifically adopts the following technical solution:

[0007] A positioning fixture for machining includes: an adjustable positioning mechanism, comprising a worktable, an outer ring being provided on the outer side of the worktable, and an upper annular groove being formed between the outer ring and the worktable; a set of rotation adjustment components being respectively provided around the worktable; the rotation adjustment components including a linkage wheel rotatably disposed in the upper annular groove; a vertical rod being installed inside the linkage wheel, a hydraulic cylinder being provided on the vertical rod, and a clamping plate for lateral movement to clamp the workpiece being provided on one side of the hydraulic cylinder; a vertical frame being provided below the hydraulic cylinder, and two sets of friction blocks capable of moving relative to each other being provided on one side of the vertical frame; a set of friction ring plates being respectively provided on the upper and lower surfaces of the outer ring, and the friction blocks contacting the friction ring plates to stop and position the linkage wheel.

[0008] A lifting mechanism includes a lifting port, a screw is installed inside the lifting port, and a lifting block is threadedly connected to the upper part of the screw. The lifting block is raised and lowered by rotating the screw to adjust the workpiece clamping height.

[0009] In a preferred embodiment, a bidirectional lead screw is installed inside the frame, and a set of linkage blocks are slidably provided on the upper and lower sides of the frame. The bidirectional lead screw is threadedly connected to the two sets of linkage blocks, and the thread directions on both sides of the bidirectional lead screw are opposite. A lead screw motor is installed above the frame, and the output shaft of the lead screw motor is fixedly connected to the bidirectional lead screw. The upper side of the frame is fixedly connected to the upright through a connecting rod.

[0010] In a preferred embodiment, the two sets of friction blocks are respectively disposed on the upper and lower sides of the outer ring, and both sets of friction blocks and the friction ring plate are made of ceramic material with sandblasted surface.

[0011] In a preferred embodiment, a top block is installed at the upper end of the upright, the hydraulic cylinder is installed on the side of the top block near the upright frame, and the clamping plate is located on the side of the top block near the worktable. The hydraulic cylinder is connected to the clamping plate through a piston rod.

[0012] In a preferred embodiment, a set of guide grooves are respectively provided on both sides of the inner wall of the lifting port, a side guide rod is slidably provided in the guide groove, and the side guide rod is fixedly connected to the lifting block. A drive motor is provided below the screw, and the output shaft of the drive motor is fixedly connected to the screw.

[0013] In a preferred embodiment, a base is installed below the workbench, and a base plate is fixedly connected to the base by multiple sets of support rods. The outer ring is fixedly connected to the base by multiple sets of connecting plates, and the connecting plates are located between the lower friction block and the upright. The drive motor is fixed in the middle above the base plate.

[0014] In a preferred embodiment, the upper surface of the pedestal is provided with a bottom ring groove, and a round block is installed at the lower end of the upright, the round block being located within the bottom ring groove.

[0015] After adopting the above technical solution, the beneficial effects of this utility model are:

[0016] 1. To address the challenge of directional adjustment in existing machining positioning fixtures, this solution employs an adjustable positioning mechanism incorporating four sets of rotation adjustment components. Each component is equipped with a linkage wheel that rotates along the upper ring groove. This design allows for flexible adjustment of the clamping plate's clamping direction, enabling operators to adjust it to the ideal direction based on the specific shape and processing requirements of different workpieces, thus improving the fixture's adaptability to various workpieces. Once the clamping direction is adjusted, the two sets of friction blocks move towards each other. These friction blocks maintain close contact with the friction ring plate, and the strong friction force quickly brings the linkage wheel to a stop. Once the linkage wheel stops rotating, the rotation adjustment components achieve precise positioning, ensuring no displacement occurs during subsequent processing. Subsequently, the hydraulic cylinder extends the clamping plate outward, effectively clamping the workpiece. Compared to existing technologies where directional adjustment is difficult, this solution significantly improves the convenience and efficiency of directional adjustment and enhances the fixture's versatility.

[0017] 2. By designing a lifting mechanism, the workpiece is stably placed on the lifting block. Rotating the screw easily raises and lowers the lifting block within the lifting port. Rotating the screw forward causes the lifting block to rise slowly; rotating it in the opposite direction causes it to descend smoothly. This design allows for adjustment of the workpiece clamping height according to actual processing needs, ensuring the workpiece is in the ideal position during clamping. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a positioning fixture for machining according to the present invention;

[0020] Figure 2 for Figure 1 Enlarged schematic diagram of part A;

[0021] Figure 3 This is a top-view structural diagram of a positioning fixture for machining according to the present invention.

[0022] Figure 4 This is a schematic diagram of the bottom cross-section of a positioning fixture for machining according to the present invention;

[0023] Figure 5 This is a side view sectional diagram of a positioning fixture for machining according to the present invention.

[0024] Figure 6 This is a front view structural diagram of a positioning fixture for machining according to the present invention.

[0025] In the diagram, 1. Workbench; 2. Lifting mechanism; 21. Lifting block; 22. Side guide rod; 23. Lifting port; 24. Screw; 25. Drive motor; 26. Guide groove; 3. Adjustable positioning mechanism; 31. Outer ring; 32. Upper ring groove; 33. Top block; 34. Hydraulic cylinder; 35. Clamping plate; 36. Vertical frame; 37. Screw motor; 38. Vertical pole; 39. Linkage wheel; 310. Linkage block; 311. Friction block; 312. Double-acting screw; 313. Friction ring plate; 314. Round block; 315. Bottom ring groove; 4. Base plate; 5. Platform; 6. Support rod; 7. Connecting plate. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figures 1 to 6 As shown: A positioning fixture for machining includes: an adjustable positioning mechanism 3, including a worktable 1, an outer ring 31 is provided on the outer side of the worktable 1, and an upper annular groove 32 is formed between the outer ring 31 and the worktable 1; a set of rotation adjustment components are respectively provided around the worktable 1; the rotation adjustment components include a linkage wheel 39 rotatably disposed in the upper annular groove 32; a vertical rod 38 is installed in the linkage wheel 39, a hydraulic cylinder 34 is provided on the vertical rod 38, a clamping plate 35 for lateral movement to clamp the workpiece is provided on one side of the hydraulic cylinder 34; a vertical frame 36 is provided below the hydraulic cylinder 34, and two sets of friction blocks 311 that can move relative to each other are provided on one side of the vertical frame 36; a set of friction ring plates 313 are respectively provided on the upper and lower surfaces of the outer ring 31, and the friction blocks 311 contact the friction ring plates 313 to stop and position the linkage wheel 39. The lifting mechanism 2 includes a lifting port 23, a screw 24 is provided inside the lifting port 23, and a lifting block 21 is threadedly connected to the upper part of the screw 24. The lifting block 21 is raised and lowered by rotating the screw 24 to adjust the workpiece clamping height.

[0028] like Figure 1 , Figure 2 , Figure 3 , Figure 5 as well as Figure 6 As shown: A bidirectional lead screw 312 is installed inside the frame 36. A set of linkage blocks 310 are slidably installed on the upper and lower sides of the frame 36 respectively. The bidirectional lead screw 312 is threadedly connected to the two sets of linkage blocks 310, and the thread directions on both sides of the bidirectional lead screw 312 are opposite. A lead screw motor 37 is installed above the frame 36, and the output shaft of the lead screw motor 37 is fixedly connected to the bidirectional lead screw 312. One side of the upper part of the frame 36 is fixedly connected to the upright 38 via a connecting rod. The lead screw motor 37 drives the bidirectional lead screw 312 to rotate. As the bidirectional lead screw 312 rotates, it drives the two sets of linkage blocks 310 to slide towards each other inside the frame 36 through threaded transmission.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 5 as well as Figure 6 As shown: Two sets of friction blocks 311 are respectively located on the upper and lower sides of the outer ring 31. Both sets of friction blocks 311 and friction ring plates 313 are made of ceramic material with sandblasted surface. When the two sets of friction blocks 311 are tightly attached to the upper and lower sets of friction ring plates 313, friction can be generated so that the linkage wheel 39 can be stopped and not easily rotated.

[0030] like Figure 1 , Figure 3 as well as Figure 4 As shown: A top block 33 is installed on the upper end of the upright 38, and a hydraulic cylinder 34 is installed on the side of the top block 33 near the upright frame 36. A clamping plate 35 is located on the side of the top block 33 near the worktable 1. The hydraulic cylinder 34 is connected to the clamping plate 35 through a piston rod.

[0031] like Figure 1 Figure 2 , Figure 3 , Figure 5 as well as Figure 6 As shown: A set of guide grooves 26 are respectively opened on both sides of the inner wall of the lifting port 23. A side guide rod 22 is slidably arranged in the guide groove 26, and the side guide rod 22 is fixedly connected to the lifting block 21. A drive motor 25 is provided below the screw 24, and the output shaft of the drive motor 25 is fixedly connected to the screw 24.

[0032] like Figure 1 , Figure 5 as well as Figure 6 As shown: A base 5 is installed under the workbench 1. A base plate 4 is fixedly connected to the base 5 by multiple sets of support rods 6. The outer ring 31 is fixedly connected to the base 5 by multiple sets of connecting plates 7. The connecting plates 7 are located between the lower friction block 311 and the upright 38. The drive motor 25 is fixed in the middle above the base plate 4.

[0033] like Figure 1 and Figure 5 As shown: A bottom ring groove 315 is provided on the upper surface of the base 5, and a round block 314 is installed at the lower end of the upright 38. The round block 314 is located in the bottom ring groove 315. When the upright 38 moves, it will drive the round block 314 to rotate smoothly along the path of the bottom ring groove 315, thereby improving the stability of the upright 38 when rotating.

[0034] In practical use, the working principle of this utility model is as follows:

[0035] In actual operation, the operator first places the workpiece to be processed on the lifting block 21. Then, the drive motor 25 is started, driving the screw 24 to rotate. Based on the threaded transmission principle, the lifting block 21 achieves smooth lifting and lowering adjustment within the lifting port 23. During the lifting process, the side guide rod 22 slides smoothly along the predetermined path of the guide groove 26, improving the stability of height adjustment and ensuring that the workpiece above the lifting block 21 can be adjusted to the appropriate clamping height according to the processing requirements. After the workpiece clamping height is adjusted to the correct position, the operator pushes the upright rod 38 to rotate within the upper annular groove 32. The upright rod 38 then drives the linkage wheel 39 to rotate along the path of the upper annular groove 32. With this design, the direction of the four sets of clamping plates 35 can be adjusted according to the clamping requirements of various workpieces. After the direction adjustment is completed, the lead screw motor 37 drives the bidirectional lead screw 312 to rotate. As the bidirectional lead screw 312 rotates, it drives two sets of linkage blocks 310 to slide towards each other within the vertical frame 36 via threaded transmission. This, in turn, pushes two sets of friction blocks 311 to move synchronously until they are in close contact with the upper and lower sets of friction ring plates 313. The friction generated by their contact stops the linkage wheel 39, effectively preventing it from continuing to rotate and positioning the rotation adjustment component. Subsequently, the hydraulic cylinder 34 pushes the clamping plate 35 to extend via the piston rod. With the cooperation of multiple clamping plates 35, the workpiece can be clamped and positioned, ensuring its stability during processing and preventing displacement or wobbling. When the vertical rod 38 moves, it drives the circular block 314 to rotate smoothly along the bottom ring groove 315. This design improves the stability of the vertical rod 38 during rotation.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A positioning fixture for machining, characterized by, The utility model relates to a workbench, which comprises: An adjustable positioning mechanism (3) comprises a workbench (1), an outer ring (31) is arranged outside the workbench (1), an upper ring groove (32) is formed between the workbench (1) and the outer ring (31), and a set of rotating adjustment assemblies are arranged around the workbench (1) respectively; The rotating adjustment assembly comprises a linkage wheel (39) rotatably arranged in the upper ring groove (32), a vertical rod (38) is mounted in the linkage wheel (39), a hydraulic cylinder (34) is arranged on the vertical rod (38), a clamping plate (35) for clamping a workpiece in a transverse direction is arranged on one side of the hydraulic cylinder (34), a vertical frame (36) is arranged below the hydraulic cylinder (34), two sets of friction blocks (311) capable of moving relative to each other are arranged on one side of the vertical frame (36), a set of friction ring plates (313) is arranged on the upper and lower surfaces of the outer ring (31) respectively, the friction blocks (311) are in contact with the friction ring plates (313), and the linkage wheel (39) is stopped and positioned by the friction blocks (311) and the friction ring plates (313); A jacking mechanism (2) comprises a lifting opening (23), a screw rod (24) is arranged in the lifting opening (23), a jacking block (21) is threadedly connected to the upper portion of the screw rod (24), and the lifting and adjustment of the jacking block (21) are realized by the rotation of the screw rod (24) to adjust the clamping height of the workpiece.

2. A positioning fixture for machining according to claim 1, characterized in that: A bidirectional screw rod (312) is mounted in the vertical frame (36), a set of linkage blocks (310) is slidably arranged on the upper and lower sides of the vertical frame (36), the bidirectional screw rod (312) is threadedly connected with the two sets of linkage blocks (310), the screw thread directions of the two sides of the bidirectional screw rod (312) are opposite, a screw rod motor (37) is mounted on the upper side of the vertical frame (36), the output shaft of the screw rod motor (37) is fixedly connected with the bidirectional screw rod (312), and the vertical frame (36) is fixedly connected with the vertical rod (38) through a connecting rod on one side of the upper portion of the vertical frame (36).

3. A positioning fixture for machining according to claim 2, characterized in that: The two sets of friction blocks (311) are arranged on the upper and lower sides of the outer ring (31) respectively, and the two sets of friction blocks (311) and the friction ring plates (313) are all made of sandblasted ceramic material.

4. A positioning fixture for machining according to claim 3, characterized in that: A top block (33) is mounted on the upper end of the vertical rod (38), the hydraulic cylinder (34) is mounted on the side of the top block (33) close to the vertical frame (36), the clamping plate (35) is arranged on the side of the top block (33) close to the workbench (1), and the hydraulic cylinder (34) is connected with the clamping plate (35) through a piston rod.

5. A positioning fixture for machining according to claim 4, characterized in that: A set of guide sliding grooves (26) is formed on the two sides of the inner wall of the lifting opening (23), a side guide rod (22) is slidably arranged in the guide sliding groove (26), the side guide rod (22) is fixedly connected with the jacking block (21), and a driving motor (25) is arranged below the screw rod (24), the output shaft of the driving motor (25) is fixedly connected with the screw rod (24).

6. A positioning fixture for machining according to claim 5, characterized in that: The workbench (1) is installed below the pedestal (5), the bottom plate (4) is fixedly connected below the pedestal (5) through a plurality of support rods (6), the outer ring (31) is fixedly connected with the pedestal (5) through a plurality of connecting plates (7), the connecting plate (7) is located between the lower friction block (311) and the vertical rod (38), and the driving motor (25) is fixed on the bottom plate (4).

7. A positioning fixture for machining according to claim 6, characterized in that: The upper surface of the pedestal (5) is provided with a bottom ring groove (315), the lower end of the vertical rod (38) is provided with a circular block (314), and the circular block (314) is located in the bottom ring groove (315).

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