Roller chain wheel mounting structure convenient to replace

Abstract

A roller chain wheel installation structure convenient to replace comprises a chain wheel, an outer side tapered wedge, a middle expansion sleeve, an inner side tapered wedge and a bolt, the front faces of the outer side tapered wedge, the middle expansion sleeve and the inner side tapered wedge are all in an incomplete circular ring shape, a notch is formed in one section of each circular ring, and the inner diameter of each circular ring is equal to the outer diameter of a shaft head; the outer side tapered wedge and the inner side tapered wedge are suitable for being sequentially arranged on the shaft head in a matched and sleeved mode from inside to outside, the side face of the outer side tapered wedge and the side face of the inner side tapered wedge are each in an inner conical trapezoid shape, the side face of the middle expansion sleeve is in an I shape with an inner conical face, and the outer side tapered wedge, the middle expansion sleeve and the inner side tapered wedge are each provided with at least seven installation screw holes evenly distributed in the annular face of the corresponding outer side tapered wedge, the corresponding middle expansion sleeve and the corresponding inner side tapered wedge. By designing the shapes of the inner side tapered wedge, the middle expansion sleeve and the outer side tapered wedge and the assembly mode among the inner side tapered wedge, the middle expansion sleeve and the outer side tapered wedge, the chain wheel is fixed on the shaft head, and when the chain wheel is replaced, only the bolt needs to be loosened, and the outer side tapered wedge, the middle expansion sleeve and the inner side tapered wedge are sequentially taken down in the axial direction.

Description

Technical Field

[0001] The utility model relates to the technical field of balers, and particularly relates to a drum sprocket installation structure which is convenient for replacement. Background Art

[0002] The round hay bale baler is a forage machinery driven by a tractor hitch. It mainly drives the side drum sprocket through a chain, so that all drums rotate clockwise synchronously, and the internal forage is compressed and formed and then netted into bales.

[0003] During the market three-package period, when the drum bearing is damaged, it is necessary to disassemble the external drum sprocket for replacement. Since the existing structure uses a hook key to fix the drum sprocket, there is a situation where the hook key is cut and deformed by the sprocket and the shaft head. At this time, the hook key is difficult to pull out, resulting in difficult replacement of the sprocket; at the same time, when using the hook key to fix the drum sprocket, when knocking the hook key to tighten the sprocket during assembly and adjustment of coplanarity, the sprocket also has an axial offset situation, which is not convenient for installation. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, the purpose of the utility model is to provide a drum sprocket installation structure which is convenient for replacement, and solve the technical problem that the installation and disassembly of the sprocket are not convenient.

[0005] The utility model is realized by the following technical solutions:

[0006] A drum sprocket installation structure which is convenient for replacement, comprising a sprocket, an outer tapered wedge, an intermediate expansion sleeve, an inner tapered wedge and bolts. The fronts of the outer tapered wedge, the intermediate expansion sleeve and the inner tapered wedge are all incomplete circular rings, and a notch is provided at a section of their circular rings. The inner diameters of their circular rings are all equal to the outer diameter of the shaft head, and they are adapted to be sleeved on the shaft head in sequence from inside to outside. The side surfaces of the outer tapered wedge and the inner tapered wedge are both inner tapered trapezoidal shapes, and the side surface of the intermediate expansion sleeve is an I-shaped shape with an inner tapered surface. The outer tapered wedge, the intermediate expansion sleeve and the inner tapered wedge are all provided with at least seven mounting screw holes evenly distributed on their circular ring surfaces. The mounting screw holes of the outer tapered wedge, the intermediate expansion sleeve and the inner tapered wedge correspond to each other one by one, and the bolts are all screwed into the above seven groups of corresponding mounting screw holes.

[0007] Preferably, the outer tapered wedge and the intermediate expansion sleeve are also provided with three inner tapered wedge ejection screw holes on their circular ring surfaces, which are distributed between the mounting screw holes. The inner tapered wedge ejection screw holes of the outer tapered wedge and the intermediate expansion sleeve correspond to each other one by one. The outer tapered wedge is also provided with three outer tapered wedge ejection screw holes on its circular ring surface, which are distributed between the mounting screw holes and the inner tapered wedge ejection screw holes.

[0008] Preferably, the seven mounting screw holes, the three inner cone wedge ejection screw holes and the three outer cone wedge ejection screw holes formed on the toroidal surface of the outer cone wedge are evenly distributed on the toroidal surface and symmetrically arranged with respect to the notch.

[0009] Preferably, the sprocket includes a main sprocket and a sub-sprocket coaxially welded to the bushing, and the sub-sprocket is installed in the same plane as the inner cone wedge.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] 1. By designing the shapes of the inner cone wedge, the intermediate expansion sleeve, the outer cone wedge and their assembly methods, the inner cone wedge and the outer cone wedge are conical and not full cones, and they deform inward in the radial direction of the shaft head to form an interference fit. At the same time, the intermediate expansion sleeve will deform outward, so that an interference fit is formed between the intermediate expansion sleeve and the inner wall of the sprocket. In this way, the sprocket is fixed on the shaft head. When replacing the sprocket, only need to loosen the bolts and remove the outer cone wedge, the intermediate expansion sleeve, and the inner cone wedge in sequence along the axial direction;

[0012] 2. By providing three inner cone wedge ejection screw holes on the toroidal surfaces of the outer cone wedge and the intermediate expansion sleeve, and three outer cone wedge ejection screw holes on the toroidal surface of the outer cone wedge. When replacing the sprocket, first loosen the bolts, then screw three of them into the three outer cone wedge ejection screw holes of the outer cone wedge to eject the outer cone wedge, then screw out the three bolts and screw them into the three inner cone wedge ejection screw holes of the intermediate expansion sleeve to eject the inner cone wedge. This facilitates the replacement and adjustment of the sprocket. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0014] Figure 1 It is a schematic structural diagram of the drum sprocket mounting structure of the present utility model that is convenient for replacement;

[0015] Figure 2 It is a schematic structural diagram of the interference fit between the outer cone wedge, the intermediate expansion sleeve and the inner cone wedge of the present utility model;

[0016] Figure 3 It is a front view and a side view structural diagram of the outer cone wedge of the present utility model;

[0017] Figure 4 It is a front view and a side view structural diagram of the intermediate expansion sleeve of the present utility model;

[0018] Figure 5 This is a front and side structural schematic diagram of the inner tapered wedge of the present utility model;

[0019] Figure 6 This is a structural schematic diagram of the sprocket of the present utility model.

[0020] Among them, there are sprocket 1, outer tapered wedge 2, intermediate expansion sleeve 3, inner tapered wedge 4, bolt 5, notch 6, shaft head 7, mounting screw hole 8, inner tapered wedge ejection screw hole 9, and outer tapered wedge ejection screw hole 10. Specific implementation manner

[0021] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0022] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings. Figures 1-6 A drum sprocket installation structure that is convenient to replace is shown, including sprocket 1, outer tapered wedge 2, intermediate expansion sleeve 3, inner tapered wedge 4, and bolt 5. The fronts of the outer tapered wedge 2, intermediate expansion sleeve 3, and inner tapered wedge 4 are all incomplete circular rings, and a notch 6 is provided at one section of their circular rings, and the inner diameters of their circular rings are all equal to the outer diameter of the shaft head 7, and are adapted to be sequentially sleeved on the shaft head 7 from the inside out. The sides of the outer tapered wedge 2 and the inner tapered wedge 4 are both inner tapered trapezoidal shapes, and the side of the intermediate expansion sleeve 3 is an I-shaped shape with an inner tapered surface. The outer tapered wedge 2, intermediate expansion sleeve 3, and inner tapered wedge 4 are each provided with at least seven evenly distributed mounting screw holes 8 on their circular ring surfaces. The mounting screw holes 8 of the outer tapered wedge 2, intermediate expansion sleeve 3, and inner tapered wedge 4 correspond one by one, and the bolts 5 are each screwed into the above seven groups of corresponding mounting screw holes 8. The inner tapered wedge 4 and the outer tapered wedge 2 are conical and not full cones, and deform inward in the radial direction of the shaft head 7 to form an interference fit. At the same time, the intermediate expansion sleeve 3 will deform outward, so that an interference fit is formed between the intermediate expansion sleeve 3 and the inner wall of the sprocket 1. In this way, the sprocket 1 is fixed on the shaft head 7. When replacing the sprocket 1, only need to loosen the bolt 5 and sequentially remove the outer tapered wedge 2, intermediate expansion sleeve 3, and inner tapered wedge 4 along the axial direction.

[0023] In terms of processing, the processing cost of the shaft head part of the present utility model will be reduced. Only an ordinary cylindrical shaft head is needed, which greatly saves the processing cost. At the same time, using this method can adjust the position of the sprocket 1. It does not need to be fixed with the shaft head. It only needs to be on the shaft head, which is convenient for adjusting the coplanarity of the sprockets. And the appropriate torque value can be selected according to the shaft diameter and the working conditions. The expansion sleeve can effectively protect the transmission components. When subjected to accidental loads, it can slip or the expansion sleeve can be damaged to ensure that important components will not be damaged, so as to reduce the user's losses and replacement costs.

[0024] As Figure 3 and Figure 4 , three inner cone wedge ejection screw holes 9 are also provided on the circular ring surfaces of the outer cone wedge 2 and the intermediate expansion sleeve 3, which are distributed between the mounting screw holes 8. The inner cone wedge ejection screw holes 9 of the outer cone wedge 2 and the intermediate expansion sleeve 3 correspond to each other one by one. Three outer cone wedge ejection screw holes 10 are also provided on the circular ring surface of the outer cone wedge 2, which are distributed between the mounting screw holes 8 and the inner cone wedge ejection screw holes 9. When replacing the sprocket 1, first loosen the seven bolts 5, then screw three of them into the three outer cone wedge ejection screw holes 10 of the outer cone wedge 2 to eject the outer cone wedge 2, and then screw out the three bolts 5 and screw them into the three inner cone wedge ejection screw holes 9 of the intermediate expansion sleeve 3 to eject the inner cone wedge, which facilitates the replacement and adjustment of the sprocket 1.

[0025] In order to keep the structure of the outer cone wedge 2 symmetrical and beautiful and facilitate the screwing in and out of the bolts 5, as Figure 3 , the seven mounting screw holes 8, three inner cone wedge ejection screw holes 9 and three outer cone wedge ejection screw holes 10 provided on the circular ring surface of the outer cone wedge 2 are evenly distributed on its circular ring surface and are symmetrically arranged with respect to the notch 6.

[0026] As Figure 6 , the sprocket 1 includes a main sprocket 102 and a sub-sprocket 103 coaxially welded to the shaft sleeve 101, and the sub-sprocket 103 is installed in the same plane as the inner cone wedge 4.

[0027] The working principle of the present utility model:

[0028] As Figure 1, the utility model is composed of a sprocket wheel 1, an outer conical wedge 2, an intermediate expansion sleeve 3, an inner conical wedge 4, and a bolt 5. During assembly, the inner conical wedge 4, the intermediate expansion sleeve 3, and the outer conical wedge 2 need to be installed on the shaft head 7 in sequence first, and then the sprocket wheel 1 is sleeved on the intermediate expansion sleeve 3. The inner conical wedge 4, the intermediate expansion sleeve 3, and the outer conical wedge 2 are tightened with bolts. The inner conical wedge 4 and the outer conical wedge 2 move towards the middle. Since the inner conical wedge 4 and the outer conical wedge 2 are conical and not a complete cone, they will deform inwards in the radial direction of the shaft head 7 to form an interference fit. At the same time, the intermediate expansion sleeve 3 will deform outwards, so that an interference fit is formed between the intermediate expansion sleeve 3 and the inner wall of the sprocket wheel 1, thus fixing the sprocket wheel 1 on the shaft head 7 of the drum. When the sprocket wheel 1 needs to be replaced, such as Figures 3-5 , first loosen the seven bolts 5 for installation, then screw three of them into the three outer conical wedge ejection screw holes 10 of the outer conical wedge 2 to eject the outer conical wedge 2, and then screw out the three bolts 5 and screw them into the three inner conical wedge ejection screw holes 9 of the intermediate expansion sleeve 3 to eject the inner conical wedge 2, which facilitates the replacement and adjustment of the sprocket wheel 1.

[0029] The above is only the preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A roller sprocket installation structure that is easy to replace, characterized in that: The invention comprises a sprocket (1), an outer cone wedge (2), an intermediate expansion sleeve (3), an inner cone wedge (4) and a bolt (5). The front faces of the outer cone wedge (2), the intermediate expansion sleeve (3) and the inner cone wedge (4) are all incomplete circular rings, and a notch (6) is provided at a section of the circular rings. The inner diameters of the circular rings are all equal to the outer diameters of the shaft heads (7), and the sprockets are suitable for being fitted and sleeved on the shaft heads (7) from the inside to the outside in sequence. The side faces of the outer cone wedge (2) and the inner cone wedge (4) are both in the shape of inner cones. The side faces of the intermediate expansion sleeve (3) are in the shape of an I-beam with an inner cone surface. The outer cone wedge (2), the intermediate expansion sleeve (3) and the inner cone wedge (4) are all provided with at least seven mounting screw holes (8) evenly distributed on the circular ring surfaces. The mounting screw holes (8) of the outer cone wedge (2), the intermediate expansion sleeve (3) and the inner cone wedge (4) are all in one-to-one correspondence. The bolts (5) are all screwed into the seven groups of corresponding mounting screw holes (8).

2. The roller sprocket installation structure that is easy to replace according to claim 1 is characterized in that: The outer conical wedge (2) and the middle expansion sleeve (3) are both provided with three inner conical wedge ejection screw holes (9) on their annular surfaces, which are distributed between the mounting screw holes (8); the inner conical wedge ejection screw holes (9) of the outer conical wedge (2) and the middle expansion sleeve (3) are in one-to-one correspondence; the outer conical wedge (2) is also provided with three outer conical wedge ejection screw holes (10) on its annular surface, which are distributed between the mounting screw holes (8) and the inner conical wedge ejection screw holes (9).

3. The roller sprocket installation structure that is easy to replace according to claim 2 is characterized in that: The seven mounting screw holes (8), three inner cone wedge ejection screw holes (9) and three outer cone wedge ejection screw holes (10) formed on the annular surface of the outer cone wedge (2) are evenly distributed on the annular surface and are symmetrically arranged with respect to the notch (6).

4. The roller sprocket installation structure that is easy to replace according to claim 1 or 3 is characterized in that: The sprocket (1) comprises a main sprocket (102) and a secondary sprocket (103) coaxially welded to a shaft sleeve (101); the secondary sprocket (103) is installed in the same plane as the inner cone wedge (4).

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