Self-cleaning tap for blind hole machining

Abstract

This utility model discloses a self-cleaning tap for blind hole machining, including a support frame, a transmission rod, a tapping mechanism, and an angle adjustment mechanism. The transmission rod is rotatably connected to the support frame, the tapping mechanism is mounted on the transmission rod, and the angle adjustment mechanism is mounted on the support frame. This utility model solves the problems of insufficient precision and cumbersome operation in traditional motor-driven angle adjustment by setting up an angle adjustment mechanism and, through the coordinated mechanism of the ratchet and pawl linkage structure and the cam rotation within the angle adjustment mechanism. The ratchet and pawl structure, through its mechanical hard-limiting characteristics, ensures that each angle adjustment stops precisely at 90°, eliminating gear backlash errors or inertial overshoot caused by direct motor drive. Furthermore, the linkage design of the cam-driven pawl further enhances the repeatability and positioning accuracy of angle switching, avoiding thread machining quality defects caused by angle deviations in traditional taps. It is simple, efficient, and practical.

Description

Technical Field

[0001] This utility model relates to a tap, specifically a self-cleaning tap for blind hole machining, and belongs to the field of tap technology. Background Technology

[0002] In the field of mechanical manufacturing, blind hole tapping is one of the key processes in the manufacturing of precision parts. Due to the closed nature of the bottom of a blind hole, the chips generated during the machining process are difficult to be discharged naturally, which can easily lead to problems such as tap jamming, poor thread surface quality, or even tool breakage. To address this, self-cleaning taps have emerged. They achieve the function of chip removal while machining through built-in chip removal structures (such as spiral grooves and coolant channels), which significantly improves the efficiency and reliability of blind hole tapping.

[0003] However, most existing taps have various problems. For example, in a blind hole tap disclosed in announcement number CN209077972U, although it reduces the impact of bottom scratches on the dimensional performance of the workpiece, saves the time of manually removing bottom burrs, improves the overall processing efficiency, and reduces manufacturing costs, the tapping angle of the tap needs to be adaptively adjusted for different processing requirements in blind hole tapping operations (such as horizontal or vertical tapping). Conventional processes require angle switching based on 90° (i.e., vertical or horizontal). However, existing technologies mostly rely on motor-driven tap rotation mechanisms to achieve angle adjustment. Motor drives are limited by gear backlash, transmission chain errors, and inertia, making it difficult to accurately stop at the 90° target position, resulting in accumulated angle deviations that affect the quality of thread processing. After completing the angle adjustment, operators need to repeatedly measure the actual angle of the tap with measuring tools. The process is cumbersome and relies on experience, which seriously restricts processing efficiency, especially in mass production. Utility Model Content

[0004] This utility model provides a solution that is significantly different from existing technologies, addressing the problem that existing technologies are too simplistic. Specifically, the purpose of this utility model is to solve the aforementioned shortcomings of existing technologies by proposing a self-cleaning tap for blind hole machining.

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

[0006] A self-cleaning tap for blind hole machining includes a support frame, a transmission rod, a tapping mechanism, and an angle adjustment mechanism. The transmission rod is rotatably connected to the support frame, the tapping mechanism is mounted on the transmission rod, and the angle adjustment mechanism is mounted on the support frame.

[0007] The tapping mechanism includes a docking cylinder, a support rod, and a tap. One end of the docking cylinder is coaxially fixed to the transmission rod. The support rod is fixed to the side wall of the docking cylinder and is set perpendicular to the docking cylinder. The tap is connected to the end of the support rod away from the docking cylinder.

[0008] The angle adjustment mechanism includes a ratchet, a driven plate, a pawl, and a linkage drive mechanism. The quadrilateral ratchet is coaxially fixed on the transmission rod. One end of the driven plate is rotatably connected to the transmission rod, and the pawl is rotatably connected to the other end of the driven plate, with one end of the pawl slidingly abutting against the ratchet.

[0009] As a further embodiment of this utility model: the linkage drive mechanism includes a linkage rod, a lever, a drive rod, and a cam. One end of the linkage rod is rotatably connected to the driven plate, and two sets of docking mechanisms composed of the pawl and the linkage rod are symmetrically arranged on both sides of the ratchet. The lever is rotatably connected between the other ends of the two adjacent sets of linkage rods. The drive rod is rotatably connected to the support frame. The cam is fixed on the drive rod, and a cam groove is provided at the edge of the cam. One end of the lever is slidably engaged in the cam groove.

[0010] As a further embodiment of this utility model: the pawl is rotatably connected to the linkage rod via a shaft, and a torsion spring is sleeved on the shaft, with one end of the torsion spring abutting against the pawl and the other end abutting against the driven plate.

[0011] As a further embodiment of this utility model: the tapping mechanism further includes a limiting cylinder, a guide rod, and an injection pipe. The limiting cylinder is coaxially fixed on the support rod at one end near the tap. The guide rod is connected to the inside of the limiting cylinder, and cavities are provided inside the guide rod and at the center of the tap. A micro-spray hole is provided in the chip removal groove of the tap. The injection pipe is coaxially fixed inside the limiting cylinder and is connected to the cavity of the guide rod.

[0012] As a further improvement of this utility model: a sealing disc is coaxially provided on the outside of the guide rod, and the sealing disc is locked to the limiting cylinder by multiple screws.

[0013] As a further improvement of this utility model: a connecting pipe is coaxially rotatably connected to one end of the docking cylinder away from the transmission rod, and the outer wall of the connecting pipe is provided with threads.

[0014] The beneficial effects of this utility model are:

[0015] This invention solves the problems of insufficient precision and cumbersome operation in traditional motor-driven angle adjustment by setting an angle adjustment mechanism and then using the ratchet and pawl linkage structure and the cam rotation coordination mechanism in the angle adjustment mechanism. The ratchet and pawl structure ensures that each angle adjustment stops precisely at 90°, eliminating gear backlash error or inertial overshoot caused by direct motor drive. Moreover, the linkage design of cam-driven pawl further enhances the repeatability of angle switching and avoids thread processing quality defects caused by angle deviation of traditional taps. It is simple, efficient and practical. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall external structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the tapping mechanism of this utility model;

[0018] Figure 3 This is a schematic diagram of the angle adjustment mechanism of this utility model;

[0019] Figure 4 This is a schematic diagram of the ratchet and its connecting structure of the present invention.

[0020] In the diagram: 1. Support frame, 2. Transmission rod, 3. Tapping mechanism, 31. Connecting cylinder, 32. Support rod, 33. Tap, 34. Limiting cylinder, 35. Guide rod, 36. Injection pipe, 37. Connecting pipe, 4. Angle adjustment mechanism, 41. Ratchet, 42. Driven plate, 43. Pawl, 44. Linkage rod, 45. Lever, 46. Drive rod, 47. Cam. Detailed Implementation

[0021] 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. Example 1

[0022] like Figures 1 to 4 As shown, a self-cleaning tap for blind hole machining includes a support frame 1, a transmission rod 2, a tapping mechanism 3, and an angle adjustment mechanism 4. The transmission rod 2 is rotatably connected to the support frame 1, the tapping mechanism 3 is mounted on the transmission rod 2, and the angle adjustment mechanism 4 is mounted on the support frame 1.

[0023] The tapping mechanism 3 includes a docking cylinder 31, a support rod 32, and a tap 33. One end of the docking cylinder 31 is coaxially fixed to the transmission rod 2. The support rod 32 is fixed to the side wall of the docking cylinder 31 and is set perpendicular to the docking cylinder 31. The tap 33 is connected to the end of the support rod 32 away from the docking cylinder 31.

[0024] The angle adjustment mechanism 4 includes a ratchet 41, a driven plate 42, a pawl 43 and a linkage drive mechanism. The quadrilateral ratchet 41 is coaxially fixed on the transmission rod 2. One end of the driven plate 42 is rotatably connected to the transmission rod 2. The pawl 43 is rotatably connected to the other end of the driven plate 42, and one end of the pawl 43 slides against the ratchet 41.

[0025] The linkage drive mechanism includes a linkage rod 44, a lever 45, a drive rod 46, and a cam 47. One end of the linkage rod 44 is rotatably connected to the driven plate 42, and two sets of docking devices composed of the pawl 43 and the linkage rod 44 are symmetrically arranged on both sides of the ratchet 41. The lever 45 is rotatably connected between the other ends of the two adjacent sets of linkage rods 44. The drive rod 46 is rotatably connected to the support frame 1. The cam 47 is fixed on the drive rod 46, and a cam groove is provided at the edge of the cam 47. One end of the lever 45 is slidably engaged in the cam groove.

[0026] In this utility model, by setting an angle adjustment mechanism 4, and through the linkage structure of ratchet 41 and pawl 43 in the angle adjustment mechanism 4 and the coordinated mechanism of cam 47 rotation, the problems of insufficient precision and cumbersome operation of traditional motor-driven angle adjustment are solved. The ratchet 41 and pawl 43 structure, through mechanical hard limit characteristics, ensures that each angle adjustment stops precisely at 90° as the reference, eliminating gear backlash error or inertial overshoot caused by direct motor drive. Moreover, the linkage design of cam 47 driving pawl 43 further enhances the repeatability of angle switching positioning accuracy, avoiding thread processing quality defects caused by angle deviation of traditional taps. It is simple, efficient and practical. Example 2

[0027] like Figures 1 to 4 As shown, in addition to all the technical features included in Embodiment 1, this embodiment also includes:

[0028] Pawl 43 is rotatably connected to linkage rod 44 via shaft, and a torsion spring is sleeved on shaft. One end of the torsion spring abuts against pawl 43, and the other end abuts against driven plate 42. The torsion spring enables pawl 43 to always abut against ratchet 41.

[0029] The tapping mechanism 3 also includes a limiting cylinder 34, a guide rod 35, and an injection pipe 36. The limiting cylinder 34 is coaxially fixed on the support rod 32 near one end of the tap 33. The guide rod 35 is connected to the inside of the limiting cylinder 34, and cavities are provided inside the guide rod 35 and at the center of the tap 33. A micro-spray hole is provided in the chip removal groove of the tap 33. The injection pipe 36 is coaxially fixed inside the limiting cylinder 34 and is connected to the cavity of the guide rod 35. The cleaning liquid can flow out of the tap 33 and be sprayed out through the injection pipe 36 to achieve the self-cleaning function.

[0030] A sealing disc is coaxially mounted on the outside of the guide rod 35, and the sealing disc is locked to the limiting cylinder 34 by multiple screws. The sealing disc is used to fix and seal the guide rod 35 to prevent leakage.

[0031] A connecting pipe 37 is coaxially rotatably connected to the end of the docking cylinder 31 away from the transmission rod 2. The outer wall of the connecting pipe 37 is threaded, so that the docking cylinder 31 can be quickly disassembled and assembled with the external pipe through the thread.

[0032] Working principle: When using this tap, first connect the connecting pipe 37 to the external guide pipe. At this time, the cleaning fluid flows into the tap 33 through the limiting cylinder 34 and the guide rod 35 and sprays out to achieve the self-cleaning function. Then, the tap 33 can be used to process the blind hole of the workpiece. When it is necessary to adjust the angle of the tap 33, the external driving device, such as the motor driving the drive rod 46, drives the cam 47 to rotate. When the cam 47 rotates one revolution, the lever 45 slides in the groove of the cam 47 and drives the linkage rod 44 and the driven plate 42 to move together. At the same time, the pawl 43 slides at the edge of the ratchet 41 and pushes the ratchet 41 to rotate 90 degrees.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A self-cleaning tap for blind hole machining, comprising a support frame (1), a transmission rod (2), a tapping mechanism (3), and an angle adjustment mechanism (4), characterized in that, The transmission rod (2) is rotatably connected to the support frame (1), the tapping mechanism (3) is set on the transmission rod (2), and the angle adjustment mechanism (4) is set on the support frame (1); The tapping mechanism (3) includes a docking cylinder (31), a support rod (32), and a tap (33). One end of the docking cylinder (31) is coaxially fixed on the transmission rod (2). The support rod (32) is fixed on the side wall of the docking cylinder (31) and is set perpendicular to the docking cylinder (31). The tap (33) is connected to the end of the support rod (32) away from the docking cylinder (31). The angle adjustment mechanism (4) includes a ratchet (41), a driven plate (42), a pawl (43), and a linkage drive mechanism. The ratchet (41), which has a quadrilateral structure, is coaxially fixed on the transmission rod (2). One end of the driven plate (42) is rotatably connected to the transmission rod (2), and the pawl (43) is rotatably connected to the other end of the driven plate (42). One end of the pawl (43) slides against the ratchet (41).

2. The self-cleaning tap for blind hole machining according to claim 1, characterized in that: The linkage drive mechanism includes a linkage rod (44), a lever (45), a drive rod (46), and a cam (47). One end of the linkage rod (44) is rotatably connected to the driven plate (42), and two sets of docking structures formed by the combination of the pawl (43) and the linkage rod (44) are symmetrically arranged on both sides of the ratchet (41). The lever (45) is rotatably connected between the other ends of the two adjacent sets of linkage rods (44). The drive rod (46) is rotatably connected to the support frame (1). The cam (47) is fixed on the drive rod (46), and a cam groove is provided at the edge of the cam (47). One end of the lever (45) is slidably engaged in the cam groove.

3. The self-cleaning tap for blind hole machining according to claim 1, characterized in that: The pawl (43) is rotatably connected to the linkage rod (44) via a shaft, and a torsion spring is sleeved on the shaft. One end of the torsion spring abuts against the pawl (43), and the other end abuts against the driven plate (42).

4. The self-cleaning tap for blind hole machining according to claim 1, characterized in that: The tapping mechanism (3) also includes a limiting cylinder (34), a guide rod (35), and an injection pipe (36). The limiting cylinder (34) is coaxially fixed on the support rod (32) near one end of the tap (33). The guide rod (35) is connected to the limiting cylinder (34), and cavities are provided inside the guide rod (35) and at the center of the tap (33). A micro-spray hole is provided in the chip removal groove of the tap (33). The injection pipe (36) is coaxially fixed inside the limiting cylinder (34), and the injection pipe (36) is connected to the cavity of the guide rod (35).

5. A self-cleaning tap for blind hole machining according to claim 4, characterized in that: The guide rod (35) is coaxially provided with a sealing disc, and the sealing disc is locked to the limiting cylinder (34) by multiple screws.

6. The self-cleaning tap for blind hole machining according to claim 1, characterized in that: The end of the docking cylinder (31) away from the transmission rod (2) is coaxially rotatably connected to a connecting pipe (37), and the outer wall of the connecting pipe (37) is provided with threads.

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