Active shaft head assembly

Abstract

The present invention relates to a movable shaft head assembly, comprising a movable pressing sleeve and a movable shaft head, wherein the movable shaft head comprises a shaft head top, a shaft head middle and a shaft head lower part fixedly connected from top to bottom, a through hole is opened at the top of the movable pressing sleeve, and the shaft head top comprises a first cylindrical part, a frustum part and a second cylindrical part fixedly connected from top to bottom, the first cylindrical part, the frustum part and the second cylindrical part are concentrically arranged and the bottom surface area of ​​the second cylindrical part is larger than the bottom surface area of ​​the first cylindrical part, the upper surface diameter of the frustum part is the same as the bottom surface diameter of the first cylindrical part, the lower surface diameter of the frustum part is the same as the bottom surface diameter of the second cylindrical part, the first cylindrical part extends out of the through hole, a compression spring group is arranged between the middle part of the shaft head and the inner side of the top of the movable pressing sleeve, a hole elastic retaining ring is arranged at the bottom of the movable pressing sleeve, and the lower part of the shaft head extends out of the hole elastic retaining ring. The present invention effectively solves the eccentricity problem caused by the long-term use of the inner hole of the I-shaped wheel and the top clamping.

Description

Technical Field

[0001] The invention relates to a shaft head assembly, in particular to a movable shaft head assembly. Background Art

[0002] In the past, we used cylindrical shaft heads, such as Figure 1-3 The size and shape of the cylindrical shaft head cannot be changed, but in the actual production process, we found that when the inner hole of the I-shaped wheel is worn out after long-term use, the I-shaped wheel will be eccentric and move after being clamped against the top, so that it will be unbalanced when rotating, and there will be too much shaking, affecting the product quality. So the engineer directly changed the cylindrical shaft head to a conical shaft head, but during the jacking process, the conical shaft head and the inner hole of the I-shaped wheel are in line contact, and there is no contact with other surfaces. In this way, during the jacking process, the I-shaped wheel will tilt and cannot be accurately clamped against the top. Summary of the invention

[0003] In order to solve the problem of eccentric movement after top clamping caused by the inner hole of the I-shaped wheel being worn out after long-term use, the present invention provides a movable shaft head assembly to solve this problem.

[0004] The movable shaft head assembly of the present invention comprises a movable pressing sleeve and a movable shaft head arranged in the movable pressing sleeve, the movable shaft head comprising a shaft head top, a shaft head middle and a shaft head lower part fixedly connected from top to bottom, the movable pressing sleeve top is provided with a through hole, the shaft head top comprises a first cylindrical part, a frustum part and a second cylindrical part fixedly connected from top to bottom, the first cylindrical part, the frustum part and the second cylindrical part are concentrically arranged and the bottom surface area of ​​the second cylindrical part is larger than the bottom surface area of ​​the first cylindrical part, the upper surface diameter of the frustum part is the same as the bottom surface diameter of the first cylindrical part, the lower surface diameter of the frustum part is the same as the bottom surface diameter of the second cylindrical part, the first cylindrical part extends out of the through hole in the top of the movable pressing sleeve, a compression spring group is provided between the middle part of the shaft head and the inner side of the top of the movable pressing sleeve, an elastic retaining ring for a hole is provided at the bottom of the movable pressing sleeve, and the lower part of the shaft head extends out of the elastic retaining ring for the hole.

[0005] In order to allow the movable shaft head to be pushed forward smoothly, the spring force of the compression spring group is greater than the deadweight of the pushed I-shaped wheel.

[0006] Further, specifically, the middle portion of the shaft head and the lower portion of the shaft head are both cylindrical and are concentrically arranged, and the bottom surface area of ​​the lower portion of the shaft head is smaller than the bottom surface area of ​​the middle portion of the shaft head.

[0007] Furthermore, the movable pressing sleeve is a hollow cylinder, and the middle part of the shaft head is clearance-matched with the inner side of the movable pressing sleeve.

[0008] As an optimization, four inner holes are circumferentially provided at one end of the middle part of the shaft head close to the top of the shaft head, and the four inner holes are arranged on the periphery of the top of the shaft head. The compression spring group includes four compression springs, and one end of each compression spring is placed in the inner hole, and the other end is connected to the inner side of the top of the movable pressing sleeve.

[0009] Further, specifically, the diameter of the through hole is the same as the diameter of the lower surface of the frustum portion.

[0010] The invention has the following beneficial effects: (1) When the movable shaft head assembly starts to push the I-shaped wheel upward, under the action of the compression spring (the spring force is greater than the weight of the I-shaped wheel), the lower end surface of the I-shaped wheel is in horizontal contact with the upper surface of the movable pressing sleeve, and the I-shaped wheel rises steadily without tilting. (2) When the I-shaped wheel is lifted into place, the movable pressing sleeve moves downward relative to the movable shaft head under the action of external force, and uses the conical surface of the frustum to adapt to the actual inner diameter of the I-shaped wheel hole (the inner hole of the I-shaped wheel is worn larger and larger as it is used for a long time). In this way, the centering of the I-shaped wheel after being clamped against the top is ensured, and there will be no eccentricity or movement. When rotating, there will not be too much shaking, thereby improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is the cylindrical shaft head currently used;

[0012] Figure 2 This is a schematic diagram of the structure of the cylindrical shaft head currently used before top clamping;

[0013] Figure 3 This is a schematic diagram of the structure of the cylindrical shaft head currently used after top clamping;

[0014] Figure 4 It is a structural schematic diagram of the movable shaft head assembly of the present invention;

[0015] Figure 5 It is a structural schematic diagram of the movable shaft head assembly of the present invention before top clamping;

[0016] Figure 6 It is a schematic structural diagram of the movable shaft head assembly of the present invention after top clamping.

[0017] 1-movable pressing sleeve; 2-top of shaft head; 3-middle of shaft head; 4-lower part of shaft head; 5-through hole; 6-first cylindrical part; 7-cone part; 8-second cylindrical part; 9-elastic retaining ring; 10-inner hole; 11-compression spring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figure 4-6 As shown, the movable shaft head assembly of the present invention comprises a movable pressing sleeve 1 and a movable shaft head arranged in the movable pressing sleeve 1, the movable shaft head comprises a shaft head top 2, a shaft head middle part 3 and a shaft head lower part 4 fixedly connected from top to bottom, a through hole 5 is opened at the top of the movable pressing sleeve 1, the shaft head top 2 comprises a first cylindrical part 6, a frustum part 7 and a second cylindrical part 8 fixedly connected from top to bottom, the first cylindrical part 6, the frustum part 7 and the second cylindrical part 8 are concentrically arranged and the bottom area of ​​the second cylindrical part 8 is larger than the bottom area of ​​the first cylindrical part 6, the upper surface diameter of the frustum part 7 is the same as the bottom surface diameter of the first cylindrical part 6, the lower surface diameter of the frustum part 7 is the same as the bottom surface diameter of the second cylindrical part 8, the first cylindrical part 6 extends out of the through hole 5 at the top of the movable pressing sleeve 1, a compression spring group is arranged between the shaft head middle part 3 and the inner side of the top of the movable pressing sleeve 1, a hole elastic retaining ring 9 is arranged at the bottom of the movable pressing sleeve 1, and the shaft head lower part 4 extends out from the hole elastic retaining ring 9.

[0020] The spring force of the compression spring group is greater than the deadweight of the I-shaped wheel being pushed. The middle part 3 of the shaft head and the lower part 4 of the shaft head are both cylindrical and concentrically arranged, and the bottom area of ​​the lower part 4 of the shaft head is smaller than the bottom area of ​​the middle part 3 of the shaft head. The movable sleeve 1 is a hollow cylinder, and the middle part 3 of the shaft head is clearance-matched with the inner side of the movable sleeve 1. Four inner holes 10 are circumferentially arranged at one end of the middle part 3 of the shaft head close to the top part 2 of the shaft head, and the four inner holes 10 are arranged on the periphery of the top part 2 of the shaft head. The compression spring group includes four compression springs 11, and one end of each compression spring 11 is inserted into the inner hole 10, and the other end is connected to the inner side of the top of the movable sleeve 1. The diameter of the through hole 5 is the same as the diameter of the lower surface of the frustum part 7.

[0021] Working principle: When the movable shaft head assembly pushes the I-shaped wheel upward at the beginning, under the action of the compression spring 11 (the spring force is greater than the weight of the I-shaped wheel), the lower end surface of the I-shaped wheel is in horizontal contact with the upper surface of the movable pressing sleeve 1, and the I-shaped wheel rises steadily without tilting. When the I-shaped wheel is lifted into place, the movable pressing sleeve 1 moves downward relative to the movable shaft head assembly under the action of external force, and uses the conical surface of the frustum 7 to adapt to the actual inner diameter of the I-shaped wheel hole (the inner hole of the I-shaped wheel becomes larger and larger due to long-term use). In this way, the centering of the I-shaped wheel after top clamping is ensured, and there will be no eccentricity or movement. When rotating, there will not be too much shaking, thereby improving product quality.

[0022] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A movable shaft head assembly, characterized in that: The cam is an axially movable body part, and the cam is a plurality of axially movable bodies, each of which is a plurality of axially movable bodies, each of which is a plurality of axially movable bodies.

2. The movable shaft head assembly according to claim 1, characterized in that: The middle part of the shaft head and the lower part of the shaft head are both cylindrical and are concentrically arranged, and the bottom surface area of ​​the lower part of the shaft head is smaller than the bottom surface area of ​​the middle part of the shaft head.

3. The movable shaft head assembly according to claim 2, characterized in that: The movable pressing sleeve is a hollow cylinder, and the middle part of the shaft head is in clearance fit with the inner side of the movable pressing sleeve.

4. The movable shaft head assembly according to claim 1, characterized in that: Four inner holes are circumferentially arranged at one end of the middle part of the shaft head near the top of the shaft head, and the four inner holes are arranged on the periphery of the top of the shaft head. The compression spring group includes four compression springs, one end of each compression spring is inserted into the inner hole, and the other end is connected to the inner side of the top of the movable compression sleeve.

5. The movable shaft head assembly according to claim 1, characterized in that: The diameter of the through hole is the same as the diameter of the lower surface of the frustum.

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