Clamping device for cutting open slot at shaft end

Abstract

The clamping device comprises a positioning block and a clamping block, a positioning cavity for containing the clamping block is formed in one side of the positioning block, the clamping block is detachably installed in the positioning cavity, a receding hole for one end of an eccentric shaft to penetrate through is formed in the other side of the positioning block, and the other end of the eccentric shaft is detachably installed in the receding hole. The receding hole is communicated with the positioning cavity. The clamping block is provided with a central positioning hole used for clamping the root of the eccentric shaft, the central positioning hole is formed in the thickness direction of the clamping block, and the central axis of the central positioning hole coincides with the central axis of the clamping block. According to the clamping device for cutting the open slot in the shaft end, rapid clamping and positioning and automatic alignment can be achieved, and the purposes of reducing the labor intensity, improving the machining consistency and improving the clamping efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the field of clamping fixtures, in particular to a clamping device for cutting a slot at a shaft end. Background Art

[0002] When it is necessary to process cross-opening grooves on the ends of thin shafts or eccentric shafts, wire cutting equipment is generally used. Due to the lack of special tooling, the process of wire cutting cross-opening grooves has problems such as difficulty in clamping and positioning, difficulty in aligning the first set of grooves, and difficulty in aligning when processing the second set of grooves. Usually, during the alignment process, it is necessary to use a micrometer to repeatedly check the meter. During this period, the operator needs to bend over to observe. In addition, such parts are generally produced in large batches. Operators suffer from lumbar pain and fatigue due to long-term bending over, and the processing efficiency is low. The processing accuracy of the existing clamping mode is greatly affected by the clamping error and alignment error, and the processing consistency is poor. The clamping methods of different thin shafts and eccentric shafts are not uniform, and the tooling is not universal.

[0003] The utility model patent with authorization announcement number CN217751015U discloses an eccentric shaft end face processing tool, including a base plate, a guide post, a front end clamping body, and a tail end clamping body. The base plate is made of rectangular plate material, a rectangular guide post is set in the middle of the base plate, and the base plate is fixedly connected to the guide post. The tail end clamping body is set at one end of the guide post, and the front end clamping body is set at the middle and rear part of the other end of the guide post. The bottom of the front end clamping body and the tail end clamping body are provided with grooves corresponding to the guide post and are embedded in the guide post. The tool adopts a combined structure, and the two clamping bodies are designed with eccentric inner hole structures to ensure the eccentricity of the eccentric circle. The eccentric shaft end face processing tool has a simple structure, accurate positioning, and reliable operation. It can avoid angular deviation of eccentricity and the occurrence of mis-pressing in the positive and negative directions, thereby improving the product qualification rate and reducing production costs. However, the eccentric shaft end face processing tool does not involve the centering clamping operation when processing the cross-opening groove at the end of thin shafts and eccentric shafts, and therefore cannot be directly applied to the processing and clamping of cross-opening grooves at the end of thin shafts and eccentric shafts. Utility Model Content

[0004] In order to achieve rapid clamping and positioning and automatic alignment, thereby reducing labor intensity, improving processing consistency, and increasing clamping efficiency, the technical solution adopted by the utility model is as follows: a clamping device for cutting a slot at the end of a shaft, comprising a positioning block and a clamping block, wherein one side of the positioning block is provided with a positioning cavity for accommodating the clamping block, the clamping block is detachably mounted in the positioning cavity, and the other side of the positioning block is provided with a clearance hole for one end of the eccentric shaft to pass through, the clearance hole being connected to the positioning cavity;

[0005] The clamping block is provided with a center positioning hole for clamping the root of the eccentric shaft. The center positioning hole is arranged along the thickness direction of the clamping block, and the center axis of the center positioning hole coincides with the center axis of the clamping block.

[0006] Based on the above, in order to facilitate the eccentric shaft to pass through the central positioning hole and the clearance hole in sequence, the central positioning hole and the clearance hole are correspondingly arranged, and the diameter of the clearance hole is larger than the diameter of the central positioning hole.

[0007] Based on the above, in order to facilitate clamping, the thickness of the clamping block is equal to the depth of the positioning cavity.

[0008] Based on the above, in order to achieve lateral tightening, a first threaded hole communicating with the positioning cavity is provided on the top of the positioning block, and a first bolt for laterally tightening the clamping block in the positioning cavity is provided in the first threaded hole.

[0009] Based on the above, in order to achieve lateral tightening, a second threaded hole communicating with the central positioning hole is provided on the top of the clamping block, and a second bolt for tightening the root of the eccentric shaft is provided in the second threaded hole.

[0010] Based on the above, in order to ensure a smooth transition, arc transitions are respectively provided at the corners of the positioning cavity and the corners of the clamping block.

[0011] Based on the above, in order to avoid interference with the bolt head, a clearance groove is opened on the edge of the clamping block, the clearance groove is arranged along the thickness direction of the clamping block, and the second threaded hole is located in the clearance groove.

[0012] The present invention has substantial features and progress compared to the prior art. Specifically, the present invention provides a clamping device for cutting an open groove at the end of a shaft, which is divided into two parts: a clamping block and a positioning block. The parts are clamped with the outer circle of the left eccentric shaft section for processing the cross-open groove as the clamping positioning surface. The end face of the shaft shoulder is pressed against each other to achieve axial positioning. The positioning hole of the clamping block is loosely matched with the outer circle of the shaft, and the clamping method adopts side-fixed top tightening. The clamping block and the positioning block are loosely matched, and the clamping method adopts side-fixed top tightening. The end face of the clamping block is pressed against the end face of the positioning cavity to achieve axial positioning. Specifically, the mating surfaces of the two parts adopt a square design, which is convenient for processing the second group of grooves after the first group of grooves are completed, and at the same time avoids the problem of repeated alignment when switching parts, thereby achieving rapid clamping and positioning and automatic alignment, achieving the purpose of reducing labor intensity, improving processing consistency, and improving efficiency.

[0013] At the same time, the size of the positioning hole of the clamping block can be changed to adapt to the clamping of shaft parts of various specifications, thereby achieving rapid conversion of different specifications and different parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic structural diagram of a clamping device for cutting a slot at a shaft end and an eccentric shaft in an installed state.

[0015] Figure 2 The utility model is a schematic diagram of the overall structure of the positioning block in the clamping device for cutting a slot at the shaft end provided by the present invention.

[0016] Figure 3 The utility model is a schematic diagram of the cross-sectional structure of a positioning block in a clamping device for cutting a slot at a shaft end provided by the utility model.

[0017] Figure 4 It is a schematic diagram of the overall structure of the clamping block in the clamping device for cutting an open groove at the shaft end provided by the utility model.

[0018] Figure 5 The utility model is a schematic diagram of the cross-sectional structure of a clamping block in a clamping device for cutting a slot at a shaft end provided by the utility model.

[0019] Figure 6 This is a schematic diagram of the assembly structure of the clamping device for cutting a slot at the end of a shaft provided in Example 1 of the present utility model.

[0020] Figure 7 This is a schematic diagram of the assembly structure of the clamping device for cutting an open groove at the shaft end provided in Example 4 of the present utility model.

[0021] In the figure: 1. Positioning block; 2. Left eccentric shaft segment; 3. Cross-opening slot; 4. First threaded hole; 5. Second threaded hole; 6. Clamping block; 7. Clearance hole; 8. Shoulder; 9. Right eccentric shaft segment; 10. Positioning cavity; 11. Clearance slot; 12. Center positioning hole. DETAILED DESCRIPTION

[0022] The technical solution of the present utility model is further described in detail below through specific implementation methods.

[0023] Example 1

[0024] This embodiment provides a clamping device for cutting a slot at the end of a shaft. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, it includes a positioning block 1 and a clamping block 6. A positioning cavity 10 is defined on one side of the positioning block 1 to accommodate the clamping block 6. The clamping block 6 is removably mounted within the positioning cavity 10. A clearance hole 7 is defined on the other side of the positioning block 1 for one end of the eccentric shaft to pass through. The clearance hole 7 communicates with the positioning cavity 10.

[0025] Specifically, according to the structure, the positioning shaft can be divided into a left eccentric shaft section 2, a shaft shoulder 8 and a right eccentric shaft section 9, and the axes of the left eccentric shaft section 2, the shaft shoulder 8 and the right eccentric shaft section 9 do not coincide.

[0026] The clamping block 6 is provided with a center positioning hole 12 for clamping the root of the left eccentric shaft segment 2. The center positioning hole 12 is arranged along the thickness direction of the clamping block 6. The center axis of the center positioning hole 12 coincides with the center axis of the clamping block 6.

[0027] Specifically, in order to facilitate the eccentric shaft to pass through the central positioning hole 12 and the clearance hole 7 in sequence, the central positioning hole 12 is correspondingly provided with the clearance hole 7. The diameter of the clearance hole 7 is larger than the diameter of the central positioning hole 12.

[0028] To achieve lateral tightening, the top of the positioning block 1 is provided with a first threaded hole 4 that communicates with the positioning cavity 10. A first bolt is disposed in the first threaded hole 4 for laterally tightening the clamping block 6 within the positioning cavity 10. To achieve lateral tightening, the top of the clamping block 6 is provided with a second threaded hole 5 that communicates with the central positioning hole 12. A second bolt is disposed in the second threaded hole 5 for tightening the root of the eccentric shaft segment 2.

[0029] In order to avoid interference with the bolt head, a clearance groove 11 is provided on the edge of the clamping block 6 , and the clearance groove 11 is arranged along the thickness direction of the clamping block 6 . The second threaded hole 5 is located in the clearance groove 11 .

[0030] In the specific installation of this embodiment, if Figure 6 As shown, first, the left eccentric shaft segment 2 is passed through the central positioning hole 12, and the second bolt is installed in the second threaded hole 5, and the root of the left eccentric shaft segment 2 is tightened with the second bolt. Then, the clamping block 6 is detachably installed in the positioning cavity 10 with the side with the clearance groove 11 facing upward, and the first bolt is installed in the first threaded hole, and the clamping block 6 is tightened with the first bolt.

[0031] Example 2

[0032] This embodiment provides a clamping device for cutting an open groove at the end of a shaft. The main difference from Example 1 is that in this embodiment: to facilitate clamping, the thickness of the clamping block 6 is equal to the depth of the positioning cavity 10.

[0033] Example 3

[0034] This embodiment provides a clamping device for cutting an open groove at the end of a shaft. The main difference from Example 1 is that in this embodiment: in order to ensure a smooth transition, the corners of the positioning cavity 10 and the corners of the clamping block 6 are respectively provided with arc transitions.

[0035] Example 4

[0036] This embodiment provides a clamping device for cutting a slot at the end of a shaft. The main difference from the first embodiment is that in this embodiment: during the specific installation, Figure 7 As shown, first, the left eccentric shaft segment 2 is passed through the central positioning hole 12, and the second bolt is installed in the second threaded hole 5, and the root of the left eccentric shaft segment is tightened using the second threaded hole. Then, the side of the clamping block 6 with the makeshift groove 11 is set sideways, and the clamping block 6 is detachably installed in the positioning cavity 10, and the first bolt is installed in the first threaded hole 4, and the clamping block 6 is tightened using the first bolt.

[0037] Specifically, the parts are clamped with the outer circle of the left eccentric shaft section 2 at the end of the cross-opening groove 3 as the clamping positioning surface, and the end face of the shaft shoulder 8 is pressed against it for axial positioning. The second threaded hole and the outer circle of the shaft adopt a seventh-level tolerance clearance fit, and the clamping method adopts side fixing and top tightening.

[0038] The clamping block 6 and positioning block 1 also utilize a seven-grade clearance fit, with side-locking and top-tightening as the clamping mechanism. The end face of the clamping block 6 abuts against the end face of the positioning cavity 10 for axial positioning. The square design of the mating surfaces facilitates machining the first set of cross-shaped slots 3 before reversing to machine the second set, while also avoiding the need for repeated alignment issues when switching parts.

[0039] Among them, by using the shaft end slot cutting quick clamping device provided by the utility model, the time taken to clamp the eccentric shaft parts was counted, and the results showed that the total time taken for two clamping corrections was about 2 minutes per piece.

[0040] Statistical data indicates that when machining parts using this device, the eccentric shaft clamping and correction time has been reduced from 13 minutes per part to 2 minutes per part, significantly reducing operator fatigue and significantly improving efficiency. Furthermore, due to the use of a unified positioning block interface, switching between parts of different diameters does not require replacing positioning blocks; instead, only clamping blocks with center positioning holes of varying diameters need to be replaced. This significantly reduces changeover preparation time and significantly improves part machining consistency.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and not to limit it; although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solution of the utility model, they should all be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A clamping device for cutting a slot at the end of a shaft, characterized by: It includes a positioning block and a clamping block, wherein a positioning cavity for accommodating the clamping block is provided on one side of the positioning block, and the clamping block is detachably mounted in the positioning cavity, and a clearance hole for passing one end of the eccentric shaft is provided on the other side of the positioning block, and the clearance hole is connected to the positioning cavity; The clamping block is provided with a center positioning hole for clamping the root of the eccentric shaft. The center positioning hole is arranged along the thickness direction of the clamping block, and the center axis of the center positioning hole coincides with the center axis of the clamping block.

2. The clamping device for cutting a slot at the end of a shaft according to claim 1, characterized in that: The central positioning hole is arranged corresponding to the clearance hole, and the diameter of the clearance hole is larger than the diameter of the central positioning hole.

3. The clamping device for cutting a slot at the end of a shaft according to claim 1 or 2, characterized in that: The thickness of the clamping block is equal to the depth of the positioning cavity.

4. The clamping device for cutting a slot at the end of a shaft according to claim 1, characterized in that: A first threaded hole communicating with the positioning cavity is provided on the top of the positioning block, and a first bolt for tightening the clamping block laterally in the positioning cavity is provided in the first threaded hole.

5. The clamping device for cutting a slot at the end of a shaft according to claim 1, 2 or 4, characterized in that: A second threaded hole communicating with the central positioning hole is provided on the top of the clamping block, and a second bolt for tightening the root of the eccentric shaft is provided in the second threaded hole.

6. The clamping device for cutting a slot at the end of a shaft according to claim 1, characterized in that: The corners of the positioning cavity and the corners of the clamping block are respectively provided with arc transitions.

7. The clamping device for cutting a slot at the end of a shaft according to claim 5, characterized in that: A clearance groove is provided on the edge of the clamping block, and the clearance groove is arranged along the thickness direction of the clamping block. The second threaded hole is located in the clearance groove.

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