Chain wheel drilling positioning tool

Abstract

The chain wheel drilling positioning tool comprises a cylindrical clamping sleeve, the clamping sleeve comprises a first section and a second section which are arranged in the axial direction, the outer diameter of the first section is matched with the inner diameter of a chain wheel, and a positioning face used for abutting against the end face of the chain wheel is formed between the second section and the first section; a positioning sleeve is arranged at the end, close to the first section, of the clamping sleeve and comprises an inner shaft section inserted into the clamping sleeve and a positioning end located outside the clamping sleeve, the positioning end is attached to the end face of the chain wheel, a plurality of positioning holes penetrating in the axial direction are formed in the positioning end, and guide sleeves are arranged in the positioning holes. A guide hole for the drill bit to pass through is formed in the guide sleeve; a first pressing plate is arranged at the end, away from the clamping sleeve, of the positioning sleeve, a second pressing plate is arranged at one end of the clamping sleeve, and a bolt and a nut are screwed to enable the first pressing plate and the second pressing plate to lock and fix the clamping sleeve and the positioning sleeve. The device is simple in structure and convenient to install and operate, improves the machining size precision, reduces the error rate, simplifies the operation and improves the production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of sprocket drilling technology, and in particular to a sprocket drilling positioning tool. Background Technology

[0002] In the machining process of sprockets, if there are no positioning fixtures, the drilling positions are generally determined by scribing. Using scribing to determine the drilling positions is a cumbersome operation, and due to differences in equipment or operator skill levels, it can lead to significant dimensional errors. Utility Model Content

[0003] To address the aforementioned technical problems, the purpose of this utility model is to propose a sprocket drilling positioning fixture to improve the dimensional accuracy of sprocket drilling, reduce the error rate, simplify operation, and improve production efficiency.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A sprocket drilling and positioning fixture includes a cylindrical ferrule. The ferrule comprises a first section and a second section arranged axially. The outer diameter of the first section is adapted to the inner diameter of the sprocket. A positioning surface for abutting against the end face of the sprocket is formed between the second section and the first section. A positioning sleeve is provided at one end of the ferrule near the first section. The positioning sleeve includes an inner shaft section inserted into the ferrule and a positioning end located outside the ferrule. The outer diameter of the inner shaft section is adapted to the inner diameter of the ferrule, and the outer diameter of the positioning end is larger than the outer diameter of the ferrule. The positioning end abuts against the end face of the sprocket. The positioning end is provided with several axially penetrating positioning holes, and a guide sleeve is provided in the positioning hole. The guide sleeve is provided with a guide hole for the drill bit to pass through. A first pressure plate is provided at the end of the positioning sleeve away from the ferrule. The first pressure plate is provided with a first through hole. A second pressure plate is provided at the end of the ferrule away from the first section. The second pressure plate is provided with a second through hole coaxial with the first through hole. A bolt passes through the first through hole and the second through hole and is screwed into a nut to lock and fix the ferrule and the positioning sleeve with the first pressure plate and the second pressure plate.

[0006] Preferably, the axial length of the first segment is less than the thickness of the sprocket.

[0007] Preferably, there is a gap of ≥1mm between the positioning end and the sleeve.

[0008] Preferably, the centers of the positioning holes are located on the same circumference.

[0009] Preferably, a washer is provided between the bolt and nut and the first pressure plate and the second pressure plate.

[0010] Preferably, the bolt is located on the axis of the ferrule.

[0011] Preferably, the outer diameter of the second pressure plate is larger than the outer diameter of the first pressure plate.

[0012] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0013] This utility model relates to a sprocket drilling positioning fixture, comprising a cylindrical ferrule, the ferrule including a first section and a second section arranged axially. The outer diameter of the first section is adapted to the inner diameter of the sprocket. A positioning surface is formed between the second section and the first section for abutting against the end face of the sprocket. A positioning sleeve is provided at the end of the ferrule near the first section. The positioning sleeve includes an inner shaft section inserted into the ferrule and a positioning end located outside the ferrule. The positioning end fits against the end face of the sprocket. The positioning end is provided with several axially penetrating positioning holes. A guide sleeve is provided in the positioning holes, and a guide hole is provided on the guide sleeve for the drill bit to pass through. A first pressure plate is provided at the end of the positioning sleeve away from the ferrule, and a second pressure plate is provided at the end of the ferrule away from the first section. A bolt and a nut are screwed together to lock and fix the ferrule and the positioning sleeve with the first and second pressure plates. The structure is simple, the installation and operation are convenient, the machining dimensional accuracy is improved, the error rate is reduced, the operation is simplified, the production efficiency is improved, and the quality stability of the mechanical equipment is improved. Attached Figure Description

[0014] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0015] Appendix Figure 1 This is the front view of the sprocket drilling positioning fixture of this utility model;

[0016] Appendix Figure 2 For the appendix Figure 1 AA sectional view.

[0017] The components are: 1. Sleeve; 11. First section; 12. Second section; 13. Positioning surface; 2. Positioning sleeve; 21. Inner shaft section; 22. Positioning end; 3. Guide sleeve; 31. Guide hole; 4. First pressure plate; 5. Second pressure plate; 6. Bolt; 7. Nut; 8. Washer; 9. Sprocket. Detailed Implementation

[0018] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0019] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or may have an intervening component present. When a component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present.

[0020] Furthermore, it should be noted that the directional terms such as left, right, up, and down used in the embodiments of this utility model are only relative concepts or references to the normal use of the product, and should not be considered restrictive. The implementation of this utility model will be described in detail below with reference to specific embodiments.

[0021] As attached Figure 1 Appendix Figure 2 The diagram shows a sprocket drilling and positioning fixture according to this utility model, comprising a cylindrical ferrule 1. The ferrule 1 includes a first section 11 and a second section 12 formed along the axial direction. The outer diameter of the first section 11 is adapted to the inner diameter of the sprocket 9. A positioning surface 13 is formed between the second section 12 and the first section 11 for abutting against the end face of the sprocket 9. A positioning sleeve 2 is installed at one end of the ferrule 1 near the first section 11. The positioning sleeve 2 includes an inner shaft section 21 inserted into the ferrule 1 and a positioning end 22 located outside the ferrule 1. The outer diameter of the inner shaft section 21 is adapted to the inner diameter of the ferrule 1, and the outer diameter of the positioning end 22 is larger than the outer diameter of the ferrule 1. The positioning end 22 fits against the end face of the sprocket 9 to position the sprocket 9. The positioning end 22 has several axially penetrating positioning holes, and a guide sleeve 3 is installed in each positioning hole. The position of the guide sleeve 3 is consistent with the position of the hole to be processed. The guide sleeve 3 has a guide hole 31 for the drill bit to pass through, so that the drill bit can easily drill the sprocket 9 through the guide hole 31. The guide sleeve is made of wear-resistant material. In this embodiment, there are a total of 12 positioning holes, and the centers of the positioning holes are located on the same circumference.

[0022] The end of the positioning sleeve 2 away from the ferrule 1 has a first pressure plate 4 with a first through hole. The end of the ferrule 1 away from the first segment 11 has a second pressure plate 5 with a second through hole coaxial with the first through hole. A bolt 6 passes through the first and second through holes and engages with a nut 7 to lock and fix the ferrule 1 and the positioning sleeve 2 with the first and second pressure plates 4 and 5, making the installation of the sprocket 9 more stable and preventing shaking and deviation during drilling.

[0023] The axial length of the first segment 11 is less than the thickness of the sprocket 9. There is a gap of ≥1mm between the positioning end 22 and the ferrule 1, so that the positioning end 22 can fit tightly against the sprocket 9. The ferrule 1 and the positioning sleeve 2 can fully clamp the sprocket 9 to avoid loosening and affecting the drilling effect.

[0024] Washers 8 are installed between bolts 6 and nut 7 and between the first pressure plate 4 and the second pressure plate 5 to ensure reliable connection and prevent loosening. Bolt 6 is located on the axis of the ferrule 1, so that the first pressure plate 4 and the second pressure plate 5 are subjected to equal force. The outer diameter of the second pressure plate 5 is larger than the outer diameter of the first pressure plate 4 to accommodate the shape of the ferrule 1 and the positioning sleeve 2.

[0025] In use, simply insert the first section 11 of the ferrule 1 into the sprocket 9 so that the end face of the sprocket 9 abuts against the positioning surface 13. Insert the inner shaft section 21 of the positioning sleeve 2 into the ferrule 1 so that the positioning end 22 abuts against the other end face of the sprocket 9. Install the first pressure plate 4 and the second pressure plate 5 at both ends of the ferrule 1 and the positioning sleeve 2 respectively, and lock them with bolts 6 and nuts 7 to fix the sprocket 9. Then, the sprocket 9 can be precisely machined by passing a drill bit through the guide hole 31. The structure is simple, the installation and operation are convenient, the machining dimensional accuracy is improved, the error rate is reduced, the operation is simplified, the production efficiency is improved, and the quality stability of the mechanical equipment is improved.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A sprocket drilling positioning tool, characterized in that: The device includes a cylindrical ferrule comprising a first section and a second section arranged axially. The outer diameter of the first section is adapted to the inner diameter of the sprocket. A positioning surface is formed between the second section and the first section for abutting against the end face of the sprocket. A positioning sleeve is provided at one end of the ferrule near the first section. The positioning sleeve includes an inner shaft section inserted into the ferrule and a positioning end located outside the ferrule. The outer diameter of the inner shaft section is adapted to the inner diameter of the ferrule, and the outer diameter of the positioning end is larger than the outer diameter of the ferrule. The positioning end fits against the end face of the sprocket. The positioning end is provided with several axially penetrating positioning holes, and a guide sleeve is provided in the positioning hole. The guide sleeve is provided with a guide hole for the drill bit to pass through. A first pressure plate is provided at the end of the positioning sleeve away from the ferrule. The first pressure plate is provided with a first through hole. A second pressure plate is provided at the end of the ferrule away from the first section. The second pressure plate is provided with a second through hole coaxial with the first through hole. A bolt passes through the first through hole and the second through hole and engages with a nut to lock and fix the ferrule and the positioning sleeve with the first pressure plate and the second pressure plate.

2. The sprocket drilling positioning tool of claim 1, wherein: The axial length of the first segment is less than the thickness of the sprocket.

3. The sprocket drilling and positioning fixture according to claim 1, characterized in that: There is a gap of ≥1mm between the positioning end and the sleeve.

4. The sprocket drilling positioning tool of claim 1, wherein: The centers of the positioning holes are located on the same circumference.

5. The sprocket drilling positioning fixture of claim 1, wherein: Gaskets are provided between the bolts and nuts and between the first pressure plate and the second pressure plate.

6. The sprocket drilling positioning fixture of claim 1, wherein: The bolt is located on the axis of the ferrule.

7. The sprocket drilling positioning fixture of claim 1, wherein: The outer diameter of the second pressure plate is larger than the outer diameter of the first pressure plate.

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