A fixture for tapping

Abstract

This application belongs to the field of fixture technology and discloses a fixture for tap machining, including a mounting frame. A square tube is horizontally arranged on the mounting frame. Four circumferentially spaced openings are formed on the body of the square tube. A first wedge block is slidably arranged within each opening. A trapezoidal block is arranged on one side of the first wedge block inside the square tube. Four circumferentially spaced sliders are slidably arranged on the outer wall of the square tube along its length. A second wedge block is arranged between each pair of adjacent sliders. The inclined surface of the second wedge block contacts the inclined surface of the first wedge block. A driving assembly is provided on the square tube to drive the four sliders to slide synchronously. The driving assembly drives the four sliders and the second wedge block to move, thus pushing the first wedge block and the trapezoidal block to move synchronously. The four trapezoidal blocks correspond to the four faces of the tap connection end, and the synchronous drive achieves radial clamping and positioning of the tap, ensuring sufficient torsional resistance and positioning accuracy when the tap is fixed.

Description

Technical Field

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

[0002] A tap is a tool for machining internal threads. According to its shape, it can be divided into spiral flute taps, angled flute taps, straight flute taps, and pipe thread taps, etc. According to its application environment, it can be divided into hand taps and machine taps, and according to its specifications, it can be divided into metric, US, and imperial taps, etc. Taps are the most mainstream machining tool used by operators in manufacturing industries when tapping threads.

[0003] Chinese utility model patent CN219632764U discloses a fixture for machining tap chucks, comprising a main body, a storage box for collecting waste chips at the lower end of the main body, and clamping seats that can move simultaneously in opposite directions at both ends inside the main body. The storage box contains a bidirectional lead screw for moving the clamping seats. The tap is clamped by the bidirectional lead screw driving the two clamping seats to move simultaneously in opposite directions.

[0004] Regarding the aforementioned technologies, the inventors believe the following drawbacks exist: The device clamps and fixes the tap from both sides by moving two clamps. However, since the cross-section of the tap's connecting end is generally square, this clamping mode, which applies force only from both sides, has obvious defects. Due to the uneven distribution of clamping force, it is difficult to provide sufficient torsional stiffness and positioning accuracy, making the tap prone to displacement or torsion loosening during processing, resulting in unstable tap quality after processing. Utility Model Content

[0005] To solve the above problems, this utility model provides a fixture for tapping.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a fixture for tapping, including a mounting frame, on which a square tube is horizontally arranged, and four circumferentially spaced openings are provided on the tube body. A first wedge block is slidably arranged in the openings. A trapezoidal block is provided on one side of the first wedge block inside the square tube. Four circumferentially spaced sliders are slidably arranged on the outer wall of the square tube along its length direction. A second wedge block is provided between each two adjacent sliders. The inclined surface of the second wedge block contacts the inclined surface of the first wedge block. A driving assembly for driving the four sliders to slide synchronously is provided on the square tube.

[0007] By adopting the above technical solution, a mounting bracket, a square tube, a first wedge block, and a drive assembly are set up. The drive assembly drives four sliders to slide synchronously along the outer wall of the square tube, causing the second wedge blocks between adjacent sliders to generate axial displacement. The inclined surface of the second wedge block pushes the first wedge block to slide along the opening, thereby causing the inner trapezoidal blocks to move synchronously. The four trapezoidal blocks correspond to the four faces of the tap connection end, and the synchronous drive realizes the radial clamping and positioning of the tap, ensuring that the tap has sufficient torsional resistance and positioning accuracy when fixed, thereby ensuring the stability of the tap quality.

[0008] Furthermore, the drive assembly includes a mounting plate disposed at the end of the square tube, a threaded tube horizontally disposed on the side of the mounting plate away from the square tube, a control ring being helically rotatably disposed on the threaded tube, and a connecting ring being disposed on the side of the four sliders adjacent to the control ring, the connecting ring being rotatably connected to the control ring.

[0009] By adopting the above technical solution, a mounting plate, an external threaded tube, a control ring, and a connecting ring are set up. The connecting ring is connected to four sliders. Constrained by the sliding connection of the sliders on the outer wall of the square tube, the connecting ring can only move linearly along the axial direction of the square tube. When the control ring rotates around the axis of the external threaded tube, based on the principle of threaded transmission, it generates axial displacement along the length of the external threaded tube. This displacement drives the four sliders to slide synchronously along the axial direction of the square tube through the connecting ring, realizing the transmission of power from the control ring to the sliders.

[0010] Furthermore, the first wedge-shaped block is provided with connecting plates on both sides of the block body outside the square tube, and a return spring is provided between the connecting plate and the outer wall of the square tube.

[0011] By adopting the above technical solution, a connecting plate and a return spring are set up. The return spring provides a pushing force to the connecting plate and the first wedge block away from the center of the square tube, ensuring the fit between the first and second wedge blocks. Furthermore, after the tapping is completed, when the control ring drives the connecting ring, slider, and second wedge block to return axially, the return spring releases its elastic potential energy, pushing the first wedge block back to its original position along the opening.

[0012] Furthermore, the connecting plate is provided with a sliding rod, and a connecting pipe connected to the outer wall of the square tube is slidably sleeved on the sliding rod. The connecting pipe and the sliding rod are located in the middle of the return spring.

[0013] By adopting the above technical solution, setting up a slide bar and connecting pipe to constrain the deformation range of the reset spring, the lateral bending of the reset spring during compression or stretching is effectively avoided, ensuring that the reset spring always works stably in the predetermined direction, thereby improving the accuracy and reliability of the first wedge block reset.

[0014] Furthermore, the second wedge block has several spaced mounting grooves on the side adjacent to the first wedge block, and a rotating roller is rotatably installed in the mounting groove, with each of the rotating rollers contacting the corresponding first wedge block.

[0015] By adopting the above technical solution, an installation groove and a rotating roller are set up, and rolling friction is used instead of traditional sliding friction to reduce transmission resistance. When the second wedge block drives the rotating roller to contact the first wedge block, the rolling motion of the rotating roller can reduce the wear between the second and first wedge blocks, and prevent the inclined surfaces of the second and first wedge blocks from developing scratches due to long-term sliding. The spaced arrangement of several rotating rollers can evenly distribute the contact pressure, making the radial movement of the first wedge block smoother and reducing the jamming phenomenon in the transmission process.

[0016] Furthermore, the mounting bracket includes a base plate, on which two vertically arranged support plates are spaced apart, one of which is connected to a square tube and the other is connected to an externally threaded tube.

[0017] Furthermore, the outer wall of the control ring is provided with several anti-slip grooves arranged at circumferential intervals.

[0018] By adopting the above technical solution, several anti-slip grooves are opened on the outer wall of the control ring to facilitate the rotation of the control ring by the staff.

[0019] In summary, this utility model has the following beneficial effects: In this application, a mounting bracket, a square tube, a first wedge block, and a driving assembly are provided. The driving assembly drives four sliders to slide synchronously along the outer wall of the square tube, causing the second wedge blocks between adjacent sliders to generate axial displacement. The inclined surface of the second wedge block pushes the first wedge block to slide along the opening, thereby causing the inner trapezoidal blocks to move synchronously. The four trapezoidal blocks correspond to the four faces of the tap connection end, and the synchronous drive achieves radial clamping and positioning of the tap, ensuring sufficient torsional resistance and positioning accuracy when the tap is fixed, thus ensuring the stability of the tap quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0021] Figure 2 This is a structural schematic diagram of the square tube and the externally threaded tube according to an embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the square tube according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the first wedge block and trapezoidal block in an embodiment of this utility model;

[0024] Figure 5This is a schematic diagram of the slider, the second wedge block, and the connecting ring in an embodiment of this utility model.

[0025] In the diagram: 10. Mounting bracket; 101. Base plate; 102. Support plate; 11. Square tube; 20. First wedge block; 21. Trapezoidal block; 22. Connecting plate; 23. Return spring; 24. Slide rod; 25. Connecting tube; 30. Slider; 31. Second wedge block; 32. Mounting groove; 33. Rotating roller; 40. Drive assembly; 41. Mounting plate; 42. External threaded tube; 43. Control ring; 431. Anti-slip groove; 44. Connecting ring. Detailed Implementation

[0026] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0027] like Figure 1-5 As shown in the embodiment of this application, a tapping fixture is disclosed, including a mounting frame 10, a square tube 11, first wedge blocks 20, and a drive assembly 40. The square tube 11 is horizontally mounted on the mounting frame 10. Four circumferentially spaced openings are formed on the tube body of the square tube 11. Four first wedge blocks 20 are slidably disposed within the four openings. A trapezoidal block 21 is disposed on one side of the first wedge block 20 inside the square tube 11. Four circumferentially spaced sliders 30 are slidably disposed on the outer wall of the square tube 11 along its length. A second wedge block 31 is disposed between each pair of adjacent sliders 30, with the inclined surface of the second wedge block 31 contacting the inclined surface of the first wedge block 20. The drive assembly 40 is mounted on the square tube 11 and is used to drive the four sliders 30 to slide synchronously. The drive assembly 40 drives the four sliders 30 to slide synchronously along the outer wall of the square tube 11, causing axial displacement of the second wedge blocks 31 between adjacent sliders 30. The inclined surface of the second wedge block 31 pushes the first wedge block 20 to slide along the opening, thereby driving the inner trapezoidal block 21 to move synchronously. The four trapezoidal blocks 21 correspond to the four faces of the tap connection end, and the radial clamping and positioning of the tap is achieved through synchronous driving, ensuring that the tap has sufficient anti-torsion requirements and positioning accuracy when fixed, thereby ensuring the stability of the tap quality.

[0028] Specifically, the drive assembly 40 includes a mounting plate 41 disposed at the end of the square tube 11. A threaded tube 42 is horizontally disposed on the side of the mounting plate 41 away from the square tube 11. A control ring 43 is helically mounted on the threaded tube 42. A connecting ring 44 is shared by four sliders 30 near the control ring 43. The connecting ring 44 is rotatably connected to the control ring 43 and to the four sliders 30. Constrained by the sliding connection of the sliders 30 to the outer wall of the square tube 11, the connecting ring 44 can only move linearly along the axial direction of the square tube 11. When the control ring 43 rotates around the axis of the threaded tube 42, based on the principle of threaded transmission, it generates axial displacement along the length of the threaded tube 42. This displacement drives the four sliders 30 to slide synchronously along the axial direction of the square tube 11 via the connecting ring 44, thus transmitting power from the control ring 43 to the sliders 30. Several circumferentially spaced anti-slip grooves 431 are provided on the outer wall of the control ring 43 to facilitate rotation by the operator. The mounting bracket 10 includes a base plate 101, on which two vertically arranged support plates 102 are spaced apart. One support plate 102 is connected to a square tube 11, and the other support plate 102 is connected to an externally threaded tube 42.

[0029] During setup, connecting plates 22 are provided on both sides of the first wedge block 20 outside the square tube 11. A return spring 23 is provided between the connecting plate 22 and the outer wall of the square tube 11. One end of the return spring 23 is connected to the connecting plate 22, and the other end is connected to the outer wall of the square tube 11. The return spring 23 provides a pushing force to the connecting plate 22 and the first wedge block 20 away from the middle of the square tube 11, ensuring the cooperation between the first wedge block 20 and the second wedge block 31. After the tap machining is completed, when the control ring 43 drives the connecting ring 44, the slider 30, and the second wedge block 31 to return axially, the return spring 23 releases its elastic potential energy, pushing the first wedge block 20 back to its original position along the opening. A sliding rod 24 is provided on the connecting plate 22. A connecting pipe 25, which is connected to the outer wall of the square tube 11, is slidably sleeved on the sliding rod 24. The connecting pipe 25 and the sliding rod 24 are located in the middle of the return spring 23. When the first wedge block 20 moves, it drives the connecting plate 22 and the sliding rod 24 to move, and the sliding rod 24 slides inside the connecting pipe 25. This constrains the deformation range of the return spring 23, effectively preventing the return spring 23 from bending laterally during compression or tension, ensuring that the return spring 23 always works stably in the predetermined direction, and improving the accuracy and reliability of the return of the first wedge block 20.

[0030] In a specific configuration, a plurality of spaced mounting grooves 32 are provided on the side of the second wedge block 31 adjacent to the first wedge block 20. Rotating rollers 33 are rotatably mounted within the mounting grooves 32, and each of the rotating rollers 33 contacts its corresponding first wedge block 20. Rolling friction replaces traditional sliding friction, reducing transmission resistance. When the second wedge block 31 drives the rotating rollers 33 to contact the first wedge block 20, the rolling motion of the rotating rollers 33 reduces wear between the second wedge block 31 and the first wedge block 20, preventing scratches from forming on the inclined surfaces of the second wedge block 31 and the first wedge block 20 due to long-term sliding. The spaced arrangement of the rotating rollers 33 evenly distributes the contact pressure, making the radial movement of the first wedge block 20 smoother and reducing jamming during transmission.

[0031] The first wedge 20 has a sloping side away from the middle of the square tube 11. The distance between the side of this sloping side near the externally threaded tube 42 and the outer wall of the square tube 11 is smaller than the distance between the other side and the outer wall of the square tube 11. The second wedge 31 has a sloping side adjacent to the first wedge 20. The distance between the side of this sloping side near the externally threaded tube 42 and the outer wall of the square tube 11 is greater than the distance between the other side and the outer wall of the square tube 11.

[0032] The operating principle of the tap-machining fixture in this embodiment is as follows: The operator inserts the connecting end of the tap into the square tube 11, ensuring that the connecting end is in contact with the mounting plate 41. Then, the operator rotates the control ring 43. The rotation of the control ring 43 drives the connecting ring 44, the slider 30, the second wedge block 31, and the rotating roller 33 to move. This pushes the first wedge block 20 to slide along the opening, thereby causing the inner trapezoidal block 21 to move synchronously. The four trapezoidal blocks 21 correspond to the four faces of the tap's connecting end, achieving radial clamping and positioning of the tap through synchronous driving, ensuring sufficient torsional resistance and positioning accuracy when the tap is fixed.

[0033] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A jig for tap machining, characterized by: The device includes a mounting bracket (10), on which a square tube (11) is horizontally arranged. The square tube (11) has four circumferentially spaced openings. A first wedge block (20) is slidably arranged inside the openings. A trapezoidal block (21) is arranged on one side of the first wedge block (20) inside the square tube (11). Four circumferentially spaced sliders (30) are slidably arranged on the outer wall of the square tube (11) along its length. A second wedge block (31) is arranged between two adjacent sliders (30). The inclined surface of the second wedge block (31) contacts the inclined surface of the first wedge block (20). A drive assembly (40) is provided on the square tube (11) to drive the four sliders (30) to slide synchronously.

2. The tap machining jig according to claim 1, characterized by: The drive assembly (40) includes a mounting plate (41) disposed at the end of the square tube (11). A threaded tube (42) is horizontally disposed on the side of the mounting plate (41) away from the square tube (11). A control ring (43) is helically disposed on the threaded tube (42). A connecting ring (44) is disposed on the side of the four sliders (30) adjacent to the control ring (43). The connecting ring (44) is rotatably connected to the control ring (43).

3. The tap machining jig according to claim 1, characterized by: The first wedge block (20) is provided with connecting plates (22) on both sides of the block body outside the square tube (11), and a return spring (23) is provided between the connecting plate (22) and the outer wall of the square tube (11).

4. The tap machining jig according to claim 3, characterized by: The connecting plate (22) is provided with a slide rod (24), and a connecting pipe (25) connected to the outer wall of the square tube (11) is slidably sleeved on the slide rod (24). The connecting pipe (25) and the slide rod (24) are located in the middle of the return spring (23).

5. The tap machining jig according to claim 1, characterized by: The second wedge block (31) has several spaced mounting grooves (32) on the side adjacent to the first wedge block (20). A rotating roller (33) is rotatably installed in the mounting groove (32), and several of the rotating rollers (33) are in contact with the corresponding first wedge block (20).

6. The tap machining jig according to claim 1, characterized by: The mounting bracket (10) includes a base plate (101), on which two vertically arranged support plates (102) are spaced apart. One of the support plates (102) is connected to a square tube (11), and the other support plate (102) is connected to an externally threaded tube (42).

7. The tap machining jig according to claim 2, characterized by: The outer wall of the control ring (43) is provided with several anti-slip grooves (431) arranged circumferentially.

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