Built-in center mechanism convenient to replace

Abstract

The utility model discloses a built-in center mechanism convenient to replace, which relates to the technical field of clamps and comprises a sleeve and a connecting cylinder. The connecting cylinder is provided with a strip-shaped cavity; an elastic center is detachably fixed at one end of the strip-shaped accommodating cavity of the connecting cylinder; the elastic center faces the opening part of the strip-shaped cavity of the connecting cylinder; the connecting cylinder is provided with a connecting side wall; the connecting side wall is the outer wall of the connecting cylinder; the connecting side wall is in the shape of a circular truncated cone side; the diameter of the connecting side wall far away from the elastic center is large; the sleeve has a first accommodating hole; the diameter of the first accommodating hole is greater than that of the smallest part of the circular-truncated-cone-shaped side surface of the connecting side wall; the diameter of the first accommodating hole is smaller than that of the largest part of the circular-truncated-cone-shaped side surface of the connecting side wall; the circular-truncated-cone-shaped side face of the connecting cylinder is attached to the inner wall of the first containing hole to be detachably fixed. According to the built-in center mechanism convenient to replace, the problem that in the prior art, when gear shafts of different sizes are machined, the working efficiency is low is solved, the center mechanism can be replaced conveniently, and the machining efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of clamping technology, and in particular to a built-in center mechanism that is easy to replace. Background Technology

[0002] When grinding the inner hole of a gear shaft, specific fixtures are required to hold the gear shaft.

[0003] In the prior art, such as the fixture for grinding the inner hole of a gear shaft disclosed in Chinese Patent Application No. 202022571401.6, a tooling for clamping a gear shaft is provided to hold the gear shaft and assist in grinding the inner hole of the gear shaft. It has a built-in center, which is used to grind the blind hole at the front end of the gear shaft. To process gear shafts of different shaft lengths, the structure for fixing the center is set to be detachably fixed to a sleeve. The sleeve is fixed with jaws for clamping the gear shaft. The jaws clamp the gear shaft so that the end face of the gear shaft to be processed faces the center for processing.

[0004] The aforementioned comparative document describes a detachable structure for fixing the movable center to accommodate gear shafts of different specifications (different shaft lengths). However, replacing the movable center is a very cumbersome process. It requires first removing the chuck assembly (using the chuck and sleeve structure described in the comparative document, as the movable center is fixed inside the sleeve from the rear; the rear refers to the other side of the chuck. The rear of the sleeve contains a transmission structure that drives the sleeve and chuck to rotate. To replace the movable center, the transmission structure must first be separated from the sleeve, and the movable center replaced from the point of separation). This slow center replacement speed reduces machining efficiency when machining a batch of gear shafts with various sizes. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides an easily replaceable built-in center mechanism, which facilitates the replacement of the center mechanism and improves processing efficiency.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides an easily replaceable built-in tip mechanism, including a sleeve and a connecting cylinder; the connecting cylinder has a strip-shaped cavity; one end of the strip-shaped cavity of the connecting cylinder is detachably fixed with an elastic tip; the elastic tip faces the opening of the strip-shaped cavity of the connecting cylinder; the connecting cylinder has a connecting sidewall; the connecting sidewall is the outer wall of the connecting cylinder; the shape of the connecting sidewall is a frustum sidewall; the diameter of the connecting sidewall is larger at the part away from the elastic tip; the sleeve has a first receiving hole; the diameter of the first receiving hole is larger than the diameter of the smallest part of the frustum sidewall of the connecting sidewall; the diameter of the first receiving hole is smaller than the diameter of the largest part of the frustum sidewall of the connecting sidewall; the frustum sidewall of the connecting cylinder is detachably fixed against the inner wall of the first receiving hole.

[0008] The easily replaceable built-in tip mechanism provided by this utility model preferably has a first receiving hole that is a conical hole adapted to the shape of the connecting sidewall; the first receiving hole and the connecting sidewall have a self-locking conical surface fit.

[0009] The easily replaceable built-in tip mechanism provided by this utility model preferably includes a fixed block, a spring, and a tip body; the connecting cylinder includes a fixed end and an extension end; the fixed end and the extension end are the two ends of the strip cavity; the fixed block is detachably fixed to the fixed end; the spring connects the fixed block and the tip body; the tip body faces the extension end.

[0010] The easily replaceable built-in tip mechanism provided by this utility model preferably includes a cylindrical limiting block provided inside the strip-shaped cavity of the connecting cylinder; the tip body is cylindrical; a blocking block extends from the outer cylindrical wall of the tip body; the cylindrical diameter of the tip body is equal to the diameter of the cylindrical hole of the limiting block; the limiting block can restrict the blocking block from moving along the extension and retraction direction of the spring; after the fixing block is fixed at the fixing end, the spring presses the blocking block against the limiting block; the tip portion of the tip body passes through the inner hole of the cylindrical ring of the limiting block.

[0011] The easily replaceable built-in tip mechanism provided by this utility model preferably includes a limiting part and a connecting part in the connecting cylinder; the limiting part is in the shape of a circular cylinder; the limiting block is disposed in the hole of the circular cylinder of the limiting part; the connecting part has the connecting sidewall; the diameter of the outer wall of the circular cylinder of the limiting part is smaller than the minimum diameter of the frustum of the connecting sidewall.

[0012] The easily replaceable built-in tip mechanism provided by this utility model preferably includes a second receiving hole in the sleeve; the length of the second receiving hole is longer than the length of the annular column of the limiting part; the limiting part is fitted with a clearance within the second receiving hole; and a cross-section perpendicular to the extending direction of the first receiving hole is provided at the junction of the first receiving hole and the second receiving hole.

[0013] The above technical solution has the following advantages or beneficial effects:

[0014] This utility model discloses an easily replaceable built-in center mechanism, relating to the field of fixture technology, including a sleeve and a connecting cylinder; the connecting cylinder has a strip-shaped cavity; one end of the strip-shaped cavity of the connecting cylinder is detachably fixed with an elastic center; the elastic center faces the opening of the strip-shaped cavity of the connecting cylinder; the connecting cylinder has a connecting sidewall; the connecting sidewall is the outer wall of the connecting cylinder; the shape of the connecting sidewall is a frustum sidewall; the diameter of the connecting sidewall is larger at the part away from the elastic center; the sleeve has a first receiving hole; the diameter of the first receiving hole is larger than the diameter of the smallest part of the frustum sidewall of the connecting sidewall; the diameter of the first receiving hole is smaller than the diameter of the largest part of the frustum sidewall of the connecting sidewall; the frustum sidewall of the connecting cylinder is detachably fixed against the inner wall of the first receiving hole. The easily replaceable built-in center mechanism provided by this utility model solves the problem of low working efficiency when machining gear shafts of various sizes in the prior art, and can easily replace the center mechanism, thereby improving machining efficiency. Attached Figure Description

[0015] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not intentionally drawn to scale; the focus is on illustrating the gist of the invention.

[0016] Figure 1 This is a schematic diagram of the overall structure of the easily replaceable built-in tip mechanism provided in Embodiment 1 of this utility model.

[0017] Figure 2 This is a cross-sectional structural diagram of the easily replaceable built-in tip mechanism provided in Embodiment 1 of this utility model.

[0018] Figure 3 This is a cross-sectional view of the connecting cylinder with an easily replaceable built-in tip mechanism provided in Embodiment 1 of this utility model, in which an elastic tip is fixed inside.

[0019] Figure 4 This is a cross-sectional structural diagram of the connecting cylinder with an easily replaceable built-in tip mechanism provided in Embodiment 1 of this utility model.

[0020] Figure 5This is a schematic diagram of the structure of the easily replaceable built-in tip mechanism after it is fixed to the gripper 01, as provided in Embodiment 1 of this utility model.

[0021] Figure 6 This is a schematic diagram of the structure of the easily replaceable built-in tip mechanism provided in Embodiment 1 of this utility model when it is fixed to the gripper 01 and clamps the gear shaft 2. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. It should also be noted that the terminology used in this utility model is for describing specific implementations only and is not intended to limit the exemplary implementations according to this application.

[0023] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without inventive effort are within the protection scope of the present utility model.

[0024] Example 1:

[0025] The easily replaceable built-in tip mechanism provided in Embodiment 1 of this utility model, such as Figures 1 to 6 As shown, it includes a sleeve 1 and a connecting cylinder 2; the connecting cylinder 2 has a strip-shaped cavity; one end of the strip-shaped cavity of the connecting cylinder 2 is detachably fixed with an elastic tip 3; the elastic tip 3 faces the opening of the strip-shaped cavity of the connecting cylinder 2; the connecting cylinder 2 has a connecting sidewall 2121; the connecting sidewall 2121 is the outer wall of the connecting cylinder 2; the shape of the connecting sidewall 2121 is a frustum sidewall; the diameter of the connecting sidewall 2121 is larger at the part away from the elastic tip 3; the sleeve 1 has a first receiving hole 11; the diameter of the first receiving hole 11 is larger than the diameter of the smallest part of the frustum sidewall of the connecting sidewall 2121; the diameter of the first receiving hole 11 is smaller than the diameter of the largest part of the frustum sidewall of the connecting sidewall 2121; the frustum sidewall of the connecting cylinder 2 is detachably fixed against the inner wall of the first receiving hole 11.

[0026] The method of using the easily replaceable built-in top mechanism provided in Embodiment 1 of this utility model is disclosed in the prior art in the prior art document mentioned in the background art, Chinese Patent Application No. 202022571401.6, which discloses a fixture for grinding the inner hole of a gear shaft. In this embodiment, the sleeve 1 is equivalent to the sleeve in the prior art. The method of fixing the sleeve 1 and the jaw in this embodiment is the same as the method of fixing the sleeve and the jaw in the prior art. The easily replaceable built-in tip mechanism provided in Embodiment 1 of this utility model achieves the replacement of the elastic tip 3 through the detachable engagement of the connecting cylinder 2 and the sleeve 1. In this embodiment, the sleeve 1 and the connecting cylinder 2 are fixed to each other by the friction generated by the interference fit between the outer wall of the frustum of the connecting cylinder 2 and the first receiving hole 11 of the sleeve 1, thereby fixing the elastic tip 3. In the specific assembly of the connecting cylinder 2 and the sleeve 1, the bottom surface of the frustum of the connecting cylinder 2 (the bottom surface refers to the bottom surface with a smaller diameter of the frustum, the diameter of the frustum of the top surface is smaller than the diameter of the first receiving hole 11, so it can be easily aligned and inserted into the first receiving hole 11) is inserted into the first receiving hole 11. (When it is necessary to separate the connecting cylinder 2 and the sleeve 1, as a preferred solution, the connecting cylinder 2 can be separated from the first receiving hole 11 by using a pin puller. Specifically, a groove is set in the inner hole of the connecting cylinder 2, the pin puller engages with this groove, and then the pin puller is struck by a tool to pull the connecting cylinder 2 out of the sleeve 1.) Compared to existing technologies, which require separating the sleeve 1 from the jaw structure before replacing the connecting cylinder 2 and the elastic tip 3 within it, this embodiment eliminates the need to separate the sleeve 1 from the jaw structure when replacing the elastic tip 3. Therefore, the replacement process is faster and more convenient (compared to the prior art). When machining a batch of gear shafts with various sizes, the replacement of the elastic tip 3 allows for quicker machining, improving production efficiency. Furthermore, the first receiving hole 11 can also be configured to fit the shape of the connecting sidewall 2121 (the first receiving hole 11 is a conical hole). The first receiving hole and the connecting sidewall have a self-locking conical surface fit; simply ensuring an interference fit between the connecting sidewall 2121 and the first receiving hole 11 is sufficient. Setting the first receiving hole 11 as a conical hole facilitates coaxial alignment between the connecting cylinder 2 and the sleeve 1, and makes it easier to disassemble and reassemble the retaining clips of the sleeve 1 and the connecting cylinder 2.

[0027] The easily replaceable built-in center mechanism provided in Embodiment 1 of this utility model solves the problem of low working efficiency when machining gear shafts of various sizes in the prior art. By changing the connection structure between the connecting cylinder 2 and the sleeve 1, the center mechanism can be easily replaced, thereby improving machining efficiency.

[0028] As a preferred embodiment, in this embodiment, the elastic tip 3 includes a fixing block 31, a spring 32, and a tip body 33; the connecting cylinder 2 includes a fixed end and an extending end; the fixed end and the extending end are the two ends of a strip-shaped cavity; the fixing block 31 is detachably fixed to the fixed end; the spring 32 connects the fixing block 31 and the tip body 33; the tip of the tip body 33 faces the extending end. Since the connecting cylinder 2 and the sleeve 1 are matched in this embodiment, when it is necessary to process gear shafts of different specifications, the dimensions of the connecting cylinder 2 and the sleeve 1 remain unchanged, and what changes is the structure of the elastic tip 3 fixed in the connecting cylinder 2. The elastic tip 3 is composed of a fixing block 31, a spring 32, and a tip body 33. When it is necessary to process gear shafts of different specifications, the length of the fixing block 31, the spring 32, or the tip body 33 is changed (in this embodiment, the length of the tip body 33 is preferably changed) to adapt to the processing of gear shafts of different specifications.

[0029] To limit the range of motion of the tip body 33 and prevent it from detaching from the opening of the gear shaft, thus affecting gear shaft machining, as a preferred embodiment, a cylindrical limiting block 22 is provided inside the strip-shaped cavity of the connecting cylinder 2; the tip body 33 is cylindrical; a blocking block 331 extends from the outer wall of the cylinder of the tip body 33; the diameter of the cylinder of the tip body 33 is equal to the diameter of the cylindrical hole of the limiting block 22; the limiting block 22 can restrict the blocking block 331 from moving along the extension and retraction direction of the spring 32; after the fixing block 31 is fixed at the fixed end, the spring 32 presses the blocking block 331 against the limiting block 22; the tip of the tip body 33 passes through the inner hole of the cylindrical hole of the limiting block 22. In this embodiment, the movement of the tip body 33 is restricted along the axial direction of the annular cylindrical shape of the limiting block 22 by the cooperation between the tip body 33 and the limiting block 22 in the connecting cylinder 2. The position of the tip body 33 (in the extension direction of the spring 32) is restricted by the blocking block 331, thereby limiting the tip body 33.

[0030] To prevent the connecting sidewall 2121 from deforming under pressure (after the connecting cylinder 2 is inserted into the sleeve 1, the deformation of the connecting sidewall 2121 causes it to deform against the inner wall of the first receiving hole 11 of the sleeve 1, resulting in deformation of the connecting sidewall 2121), thus affecting the fixed fit between the limiting block 22 and the tip body 33, as a preferred embodiment, in this embodiment, the connecting cylinder 2 includes a limiting part 211 and a connecting part 212; the limiting part 211 is in the shape of an annular column; the limiting block 22 is disposed in the hole of the annular column of the limiting part 211; the connecting part 212 has a connecting sidewall 2121; the diameter of the outer wall of the annular column of the limiting part 211 is smaller than the minimum diameter of the frustum of the connecting sidewall 2121. Since the limiting block 22 is set in the limiting part 211, the limiting part 211 will not be deformed due to the cooperation between the connecting cylinder 2 and the sleeve 1, so it will not affect the limiting block 22, thereby making the cooperation between the tip body 33 and the limiting block 22 stable.

[0031] To prevent the limiting part 211 of the connecting cylinder 2 from colliding with other structures of the equipment, thereby affecting the stability of the internal elastic tip 3, as a preferred embodiment, the sleeve 1 also has a second receiving hole 12; the length of the second receiving hole 12 is longer than the length of the annular column of the limiting part 211; the limiting part 211 is fitted with a clearance within the second receiving hole 12; a cross-section perpendicular to the extending direction of the first receiving hole 11 is provided at the junction of the first receiving hole 11 and the second receiving hole 12. The second receiving hole 12 can accommodate the limiting part 211 of the connecting cylinder 2, on which the elastic tip 3 is fixed, inside the sleeve 1, thereby protecting the structure of the elastic tip 3.

[0032] In summary, this utility model discloses an easily replaceable built-in center mechanism, relating to the field of fixture technology, comprising a sleeve and a connecting cylinder; the connecting cylinder has a strip-shaped cavity; one end of the strip-shaped cavity of the connecting cylinder is detachably fixed with an elastic center; the elastic center faces the opening of the strip-shaped cavity of the connecting cylinder; the connecting cylinder has a connecting sidewall; the connecting sidewall is the outer wall of the connecting cylinder; the shape of the connecting sidewall is a frustum sidewall; the diameter of the connecting sidewall is larger at the part away from the elastic center; the sleeve has a first receiving hole; the diameter of the first receiving hole is larger than the diameter at the smallest point of the frustum sidewall of the connecting sidewall; the diameter of the first receiving hole is smaller than the diameter at the largest point of the frustum sidewall of the connecting sidewall; the frustum sidewall of the connecting cylinder is detachably fixed against the inner wall of the first receiving hole. The easily replaceable built-in center mechanism provided by this utility model solves the problem of low working efficiency when machining gear shafts of various sizes in the prior art, allowing for convenient replacement of the center mechanism and improving machining efficiency.

[0033] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A replaceable built-in tip mechanism, characterized in that, Includes sleeves and connecting sleeves; The connecting cylinder has a strip-shaped cavity; one end of the strip-shaped cavity of the connecting cylinder is detachably fixed with an elastic tip; the elastic tip faces the opening of the strip-shaped cavity of the connecting cylinder; The connecting cylinder has a connecting sidewall; the connecting sidewall is the outer wall of the connecting cylinder; the shape of the connecting sidewall is the side surface of a frustum; the diameter of the connecting sidewall is larger at the point furthest from the elastic tip; The sleeve has a first receiving hole; the diameter of the first receiving hole is larger than the diameter of the smallest part of the frustum sidewall of the connecting sidewall; the diameter of the first receiving hole is smaller than the diameter of the largest part of the frustum sidewall of the connecting sidewall. The frustum-shaped side of the connecting cylinder is detachably fixed against the inner wall of the first receiving hole.

2. The easily replaceable built-in tip mechanism as described in claim 1, characterized in that, The first receiving hole is a conical hole adapted to the shape of the connecting sidewall; the first receiving hole and the connecting sidewall are in a self-locking conical surface fit.

3. The easily replaceable built-in tip mechanism as described in claim 1, characterized in that, The elastic tip includes a fixing block, a spring, and a tip body; The connecting cylinder includes a fixed end and an extending end; the fixed end and the extending end are the two ends of the strip-shaped cavity; The fixing block is detachably fixed to the fixing end; the spring connects the fixing block and the tip body; the tip body faces the insertion end.

4. The easily replaceable built-in tip mechanism as described in claim 3, characterized in that, The connecting cylinder has a cylindrical limiting block inside its strip-shaped cavity; The tip body is cylindrical; a blocking block extends from the outer wall of the tip body; the diameter of the tip body is equal to the diameter of the annular cylindrical hole of the limiting block. The limiting block can restrict the blocking block from moving along the extension and retraction direction of the spring; after the fixing block is fixed at the fixing end, the spring presses the blocking block against the limiting block; the tip of the tip body passes through the inner hole of the annular column of the limiting block.

5. The easily replaceable built-in tip mechanism as described in claim 4, characterized in that, The connecting cylinder includes a limiting part and a connecting part; The limiting part is in the shape of a circular cylinder; the limiting block is disposed in the hole of the circular cylinder of the limiting part; The connecting portion has the connecting sidewall; The diameter of the outer wall of the circular cylinder of the limiting part is smaller than the minimum diameter of the frustum of the connecting side wall.

6. The easily replaceable built-in tip mechanism as described in claim 5, characterized in that, The sleeve also has a second receiving hole; the length of the second receiving hole is longer than the length of the annular column of the limiting part; the limiting part is clearance-fitted into the second receiving hole; The junction between the first receiving hole and the second receiving hole has a cross-section perpendicular to the extending direction of the first receiving hole.

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