Positioning tool for rack machining

Abstract

This utility model relates to the field of mechanical manufacturing technology and discloses a positioning fixture for rack machining. It includes a base plate, a rotating shaft fixedly connected to the center of the base plate, a disc rotatably connected to the top of the rotating shaft, a clamping assembly mounted on the top of the disc, and a snap-fit ​​assembly mounted on the outer side of the base plate. The clamping assembly includes a first fixing block, fixedly connected to the top of the disc, a slider slidably connected to the center of the first fixing block, and guide rails fixedly connected to the center of each first fixing block. A second fixing block is fixedly connected to the center of each guide rail. In this utility model, the slider of the clamping assembly, under the meshing transmission of the rack and gear, converts the linear motion of the cylinder into the synchronous movement of the two clamping plates, avoiding deviation caused by uneven force on the rack, firmly fixing the rack in a specific position, and ensuring that the rack will not shift or wobble.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing technology, and in particular to a positioning fixture for rack machining. Background Technology

[0002] In the field of mechanical manufacturing, racks are a key component that converts linear motion into rotary motion. They are widely used in machine tools, automated equipment, automotive steering systems and other devices. The machining accuracy directly affects the stability and reliability of the transmission system. Therefore, in the rack manufacturing process, positioning fixtures have become the core auxiliary equipment to ensure machining accuracy and efficiency.

[0003] However, existing positioning fixtures have significant shortcomings. Traditional fixtures are mostly single-sided or asymmetrical clamping designs, which make it difficult to ensure uniform force on the rack when applying clamping force. This can lead to rack misalignment during processing or affect the accuracy of the rack tooth profile. In addition, most fixtures are only suitable for racks of specific shapes and specifications. When processing helical racks, arc racks, or variable module racks, it is necessary to frequently change the entire set of fixtures, which is not only time-consuming and labor-intensive, but also increases production costs and the risk of accumulated positioning errors. Therefore, a positioning fixture for rack processing is proposed to solve the above problems. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a positioning fixture for rack machining, which aims to improve the problem of frequent fixture changes required for machining racks of different shapes in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A positioning fixture for rack machining includes a base plate, a rotating shaft fixedly connected to the middle of the base plate, a disc rotatably connected to the top of the rotating shaft, a clamping assembly mounted on the top of the disc, and a snap-fit ​​assembly mounted on the outer side of the base plate.

[0007] The clamping assembly includes a first fixing block, which is fixedly connected to the top of the disc. A slider is slidably connected to the middle of the first fixing block. A guide rail is fixedly connected to the middle of the first fixing block. A second fixing block is fixedly connected to the middle of the guide rail. A fixing shaft is fixedly connected to the bottom of the second fixing block. A gear is rotatably connected to the middle of the fixing shaft. A rack is fixedly connected to the middle of the slider. The gear and the rack mesh with each other.

[0008] As a further description of the above technical solution:

[0009] The slider is slidably connected to the outside of the guide rail.

[0010] As a further description of the above technical solution:

[0011] The top of the disc is fixedly connected to a fixing block three, the top of the fixing block three is fixedly connected to a shell, the middle of the shell is provided with a through groove, the outer side of the fixing block three is fixedly connected to a cylinder, and the output end of the cylinder is connected to a connecting block.

[0012] As a further description of the above technical solution:

[0013] A slider is fixedly connected to the top of the connecting block.

[0014] As a further description of the above technical solution:

[0015] The buckle assembly includes a movable component and a fixed component. The movable component includes a protective shell, which is installed on the outside of the base plate. A pull rod is slidably connected to the middle of the protective shell, and a spring is sleeved on the outside of the pull rod.

[0016] As a further description of the above technical solution:

[0017] The fixing component includes a pull ring, which is fixedly connected to the front end of the pull rod. A retaining ring is fixedly connected to the outside of the pull rod. A slot is provided in the middle of the protective shell, and the pull rod is engaged with the slot.

[0018] As a further description of the above technical solution:

[0019] A clamp is fixedly connected to the outside of the slider.

[0020] As a further description of the above technical solution:

[0021] A threaded adjusting tube is provided in the middle of the base plate. The internal thread of the threaded adjusting tube is connected to a positioning bolt, and the external thread of the threaded adjusting tube is connected to a nut.

[0022] This utility model has the following beneficial effects:

[0023] In this invention, the linear motion of the cylinder is converted into the synchronous movement of the two clamping plates by the slider of the clamping component under the meshing transmission of the rack and gear. This avoids the deviation caused by uneven force on the rack, and firmly fixes the rack in a specific position to ensure that the rack will not be displaced or shaken.

[0024] In this invention, by using the snap-fit ​​assembly, simply pull the lever in the snap-fit ​​assembly, rotate the disc to the slot, release the lever, snap it into the slot and lock it in place, thus enabling the processing of racks of different shapes and improving the utilization rate of the rack processing device. Attached Figure Description

[0025] Figure 1This is a three-dimensional schematic diagram of a positioning fixture for rack machining proposed in this utility model;

[0026] Figure 2 This is a schematic diagram of the nut structure of a positioning fixture for rack machining proposed in this utility model;

[0027] Figure 3 This is a schematic diagram of the gear structure of a positioning fixture for rack machining proposed in this utility model;

[0028] Figure 4 This is a schematic diagram of the tie rod of a positioning fixture for rack machining proposed in this utility model.

[0029] Legend:

[0030] 1. Base plate; 2. Nut; 3. Threaded adjusting tube; 4. Positioning bolt; 5. Disc; 6. Fixing block one; 7. Slider; 8. Clamping plate; 9. Guide rail; 10. Fixing block two; 11. Connecting block; 12. Cylinder; 13. Outer shell; 14. Fixing block three; 15. Fixing shaft; 16. Gear; 17. Rack; 18. Through groove; 19. Protective shell; 20. Slot; 21. Pull rod; 22. Retaining ring; 23. Spring; 24. Pull ring; 25. Rotating shaft. Detailed Implementation

[0031] 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.

[0032] Reference Figures 1-3 This utility model provides an embodiment of a positioning fixture for rack machining, comprising a base plate 1, a rotating shaft 25 fixedly connected to the middle of the base plate 1, a disc 5 rotatably connected to the top of the rotating shaft 25, and a clamping assembly installed on the top of the disc 5. The clamping assembly enables precise positioning, stable clamping, and anti-displacement functions of the rack during machining. A snap-fit ​​assembly is installed on the outer side of the base plate 1; the snap-fit ​​assembly enables positioning and locking of the rack at any angle, meeting the requirements of the rack for different machining orientations.

[0033] The clamping assembly includes a first fixing block 6, which is fixedly connected to the top of the disc 5. A slider 7 is slidably connected to the middle of the first fixing block 6, and a clamping plate 8 is fixedly connected to the outer side of the slider 7. A guide rail 9 is fixedly connected to the middle of each of the first fixing blocks 6, restricting the movement trajectory of the slider 7 and ensuring the linear movement direction of the clamping plate 8. A second fixing block 10 is fixedly connected to the middle of the guide rail 9, and a fixing shaft 15 is fixedly connected to the bottom of the second fixing block 10. A gear 16 is rotatably connected to the middle of the fixing shaft 15, and a rack 17 is fixedly connected to the middle of the slider 7. The gear 16 and rack 17 mesh. When the cylinder 12 drives one side of the slider 7 to move, the meshing of the gear 16 and rack 17 causes the other side of the slider 7 to move synchronously in the opposite direction, ensuring that the clamping force of the clamping plate 8 on both sides of the rack is uniform. The slider 7 is slidably connected to the outside of the guide rail 9.

[0034] A fixing block 14 is fixedly connected to the top of the disc 5. A housing 13 is fixedly connected to the top of the fixing block 14. A through groove 18 is opened in the middle of the housing 13. A cylinder 12 is fixedly connected to the outer side of the fixing block 14. The extension and retraction of the cylinder 12 drives the slider 7 to slide on the guide rail 9, realizing the opening and closing action of the clamp 8. A connecting block 11 is located at the output end of the cylinder 12. The slider 7 is fixedly connected to the top of the connecting block 11.

[0035] Reference Figure 1 , Figure 2 and Figure 4 The latching assembly includes a movable component and a fixed component. The movable component includes a protective shell 19, which is installed on the outside of the base plate 1. A pull rod 21 is slidably connected to the middle of the protective shell 19. When the pull rod 21 is pulled, a spring 23 is compressed. After being released, the spring 23 returns to its original position, pushing the pull rod 21 to automatically engage with the slot 20, thus completing the fixation. A spring 23 is sleeved on the outside of the pull rod 21. The fixed component includes a pull ring 24, which is fixedly connected to the front end of the pull rod 21. A retaining ring 22 is fixedly connected to the outside of the pull rod 21 to prevent the pull rod 21 from coming out of the protective shell 19. A slot 20 is provided in the middle of the protective shell 19, and the pull rod 21 engages with the slot 20.

[0036] Reference Figure 1 and Figure 2 A threaded adjusting tube 3 is provided in the middle of the base plate 1. The internal thread of the threaded adjusting tube 3 is connected to a positioning bolt 4, and the external thread of the threaded adjusting tube 3 is connected to a nut 2. After the positioning bolt 4 is adjusted to the target height, the nut 2 is tightened so that it fits tightly against the upper surface of the base plate 1, thereby locking the position of the threaded adjusting tube 3.

[0037] Working principle: When the rack needs to be processed, the base plate 1 drives the disc 5 to rotate through the rotating shaft 25, so that the disc 5 can be adjusted in angle to facilitate multi-directional processing and positioning of the rack. When the pull ring 24 is pulled outward, the pull rod 21 overcomes the elastic force of the spring 23 and moves outward, disengaging from the slot 20. At this time, the disc 5 can rotate. After the pull ring 24 is released, the spring 23 returns to its original position and pushes the pull rod 21 into the slot 20, locking the position of the disc 5.

[0038] Next, the rack is placed on the disc 5. Powered by the cylinder 12, the output end of the cylinder 12 drives the connecting block 11 to move one of the sliders 7. At the same time, the slider 7 drives the rack 17 to slide. When the rack 17 moves forward, it also drives the gear 16 to rotate. At this time, the gear 16 rotates and drives the other rack 17 to slide in the opposite direction. During the meshing process of the gear 16 and the rack 17, the clamping plate 8 is also driven to move closer to the center to clamp the rack and fix it firmly. The rack is then processed by cutting, grinding and other operations. After the operation is completed, the cylinder 12 extends and drives the slider 7 to move to both sides to release the rack.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 rack machining, comprising a base plate (1), characterized in that: A rotating shaft (25) is fixedly connected to the middle of the base plate (1), and a disc (5) is rotatably connected to the top of the rotating shaft (25). A clamping assembly is installed on the top of the disc (5), and a buckle assembly is installed on the outer side of the base plate (1). The clamping assembly includes a first fixing block (6), which is fixedly connected to the top of the disc (5). A slider (7) is slidably connected to the middle of the first fixing block (6). A guide rail (9) is fixedly connected to the middle of the first fixing block (6). A second fixing block (10) is fixedly connected to the middle of the guide rail (9). A fixing shaft (15) is fixedly connected to the bottom of the second fixing block (10). A gear (16) is rotatably connected to the middle of the fixing shaft (15). A rack (17) is fixedly connected to the middle of the slider (7). The gear (16) and the rack (17) mesh with each other.

2. The positioning fixture for rack machining according to claim 1, characterized in that: The slider (7) is slidably connected to the outside of the guide rail (9).

3. The positioning fixture for rack machining according to claim 1, characterized in that: The top of the disc (5) is fixedly connected to a fixing block three (14), the top of the fixing block three (14) is fixedly connected to a shell (13), the middle of the shell (13) is provided with a through groove (18), the outer side of the fixing block three (14) is fixedly connected to a cylinder (12), and the output end of the cylinder (12) has a connecting block (11).

4. A positioning fixture for rack machining according to claim 3, characterized in that: The top of the connecting block (11) is fixedly connected to a slider (7).

5. A positioning fixture for rack machining according to claim 1, characterized in that: The buckle assembly includes a movable component and a fixed component. The movable component includes a protective shell (19), which is installed on the outside of the base plate (1). A pull rod (21) is slidably connected to the middle of the protective shell (19), and a spring (23) is sleeved on the outside of the pull rod (21).

6. A positioning fixture for rack machining according to claim 5, characterized in that: The fixing component includes a pull ring (24), which is fixedly connected to the front end of the pull rod (21). A retaining ring (22) is fixedly connected to the outside of the pull rod (21). A slot (20) is provided in the middle of the protective shell (19), and the pull rod (21) is engaged with the slot (20).

7. A positioning fixture for rack machining according to claim 1, characterized in that: A clamp (8) is fixedly connected to the outside of the slider (7).

8. A positioning fixture for rack machining according to claim 1, characterized in that: A threaded adjusting tube (3) is provided in the middle of the base plate (1). The threaded adjusting tube (3) is internally threaded with a positioning bolt (4), and the threaded adjusting tube (3) is externally threaded with a nut (2).

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