CN220523053U - Pin shaft bushing assembly structure - Google Patents

Abstract

The utility model relates to the field of tunneling equipment, in particular to a pin shaft bushing assembly structure. It comprises the following steps: the device comprises a first structural member, a second structural member, a pin shaft, a first bushing, a second bushing, a bolt, a lock nut and a gasket; the first bushing is positioned in the first mounting hole of the first structural member; the second bushing is positioned in the second mounting hole of the second structural member; the first bushing and the second bushing are respectively sleeved at two ends of the pin shaft; the bolt sequentially passes through the gasket, the first bushing through hole, the first pin shaft through hole, the second bushing through hole and the locking nut; the pin shaft is provided with a first conical surface; the first bushing and the second bushing are also respectively formed with a second conical surface; the second conical surface is matched with the first conical surface to realize the tight matching of the first bushing and the second bushing with the pin shaft; the first bushing and the second bushing are further provided with the axial opening part and the radial opening part which are communicated with each other, so that the reliability of shape matching is improved, the assembly is simple, and the damage of structural parts caused by the matching failure of all parts can be effectively reduced.

Description

Pin shaft bushing assembly structure

Technical Field

The utility model relates to the field of tunneling equipment, in particular to a pin shaft bushing assembly structure.

Background

In the pin shaft bushing assembly structure in the existing tunneling equipment, the contact surface of the pin shaft and the bushing is matched by adopting a cylindrical surface. When the fit clearance is enlarged due to larger machining errors of the fit surfaces among the pin shaft, the bushing and the structural member, or the fit clearance is enlarged due to mutual abrasion among the pin shaft, the bushing and the structural member along with the extension of the service time, the tight fit of the pin shaft, the bushing and the structural member is invalid, and therefore the structural member is damaged. In addition, in the prior art, a threaded hole is usually formed in a structural member, and a baffle is installed through a bolt so as to fix a pin bush and prevent the pin from axially moving. The structure is easy to damage and fail the baffle or the bolt, and the effect of preventing the axial movement of the pin shaft can not be achieved.

Disclosure of Invention

Aiming at the technical problems, the utility model adopts the following technical scheme:

in one aspect, a pin bushing assembly structure is provided. The pin bushing assembly structure includes: the device comprises a first structural member, a second structural member, a pin shaft, a first bushing, a second bushing, a bolt, a lock nut and two gaskets; the first structural member comprises a first mounting hole; the second structural member comprises a second mounting hole; the first bushing is positioned in the first mounting hole; the second bushing is positioned in the second mounting hole; the pin shaft is positioned between the first bushing and the second bushing, and the first bushing and the second bushing are respectively sleeved at two ends of the pin shaft; the first bushing includes a first bushing through-hole; the second bushing includes a second bushing through hole; the pin shaft comprises a first pin shaft through hole along the length direction; the bolt sequentially passes through the gasket, the first bushing through hole, the first pin shaft through hole, the second bushing through hole, the gasket and the lock nut from the head to the tail so as to fix the first structural member and the second structural member; wherein: the area of the pin shaft, which is close to the two ends of the pin shaft in the length direction, is also respectively provided with a first conical surface; the first conical surface is in a shrinkage trend from the shaft body part of the pin shaft to the end part of the pin shaft in the length direction; the first bushing and the second bushing are also respectively formed with a second conical surface; the second conical surface is positioned at the area of the first bushing and the second bushing, which is contacted with the first conical surface; the second conical surface is matched with the first conical surface to realize the tight matching of the first bushing and the second bushing with the pin shaft; the first bushing is further formed with a first axial opening and a first radial opening which are communicated with each other; the first axial opening part extends from one end of the first bushing to the other end along the length direction parallel to the bolt and is communicated with the outer wall and the inner wall of the first bushing; the first radial opening part extends from the first axial opening part to the first bushing through hole along the radial direction of the first bushing and is communicated with the outer wall and the inner wall of the first bushing; the second bushing is also provided with a second axial opening and a second radial opening which are communicated with each other; the second axial opening part extends from one end of the second bushing to the other end along the length direction parallel to the bolt and is communicated with the outer wall and the inner wall of the second bushing; the second radial opening part extends from the second axial opening part to the second bushing through hole along the radial direction of the second bushing and is communicated with the outer wall and the inner wall of the second bushing.

Further, the first bush is further formed with a first flange portion; the first flange part is positioned at one end of the first bushing, which is far away from the pin shaft; the diameter of the first flange part is larger than the aperture of the first mounting hole, and the first bushing is clamped in the first mounting hole through the first flange part.

Further, the second bushing is further formed with a second flange portion and a cylindrical surface; the second flange part is positioned at one end of the second bushing, which is far away from the pin shaft; the diameter of the second flange part is larger than the aperture of the second mounting hole, and a preset interval is reserved between the second flange part and the second structural part; the cylindrical surface is positioned on the inner wall of the second bushing, and extends from one end of the shrinkage cavity of the second conical surface to the second flange part.

Further, the first bushing further comprises a first bushing threaded hole; the first bushing threaded hole is parallel to the first bushing through hole and penetrates through the end portion of the first bushing where the first flange portion is located.

Further, the second bushing further comprises a second bushing threaded hole; the second bushing threaded hole is arranged parallel to the second bushing through hole and penetrates through the end portion of the second bushing where the second flange portion is located.

Further, the number of the first bushing threaded holes is a plurality; the plurality of first bushing threaded holes are evenly distributed around the first bushing through hole.

Further, the number of the second bushing threaded holes is a plurality; the plurality of second bushing threaded holes are evenly distributed around the second bushing through hole.

Further, the plurality of first bushing threaded holes are distributed in an annular array, and the annular array takes the first bushing through holes as circle centers.

Further, the plurality of second bushing threaded holes are distributed in an annular array, and the annular array takes the second bushing through holes as circle centers.

Further, the pin shaft further comprises a first pin shaft threaded hole and a second pin shaft threaded hole; the first pin shaft threaded hole and the second pin shaft threaded hole are respectively positioned at two ends of the first pin shaft through hole; and the aperture of the first pin shaft threaded hole and the second pin shaft threaded hole is larger than the aperture of the first pin shaft through hole.

The beneficial effects of the utility model are as follows:

1. according to the pin shaft bushing assembly structure, the first conical surfaces at the two ends of the pin shaft are respectively matched with the second conical surfaces of the inner walls of the first bushing and the second bushing, so that on one hand, the pin shaft is more tightly matched with the first bushing and the second bushing, the reliability of the shape matching between the pin shaft and the first bushing and the second bushing is improved compared with the reliability of the shape matching between the pin shaft and the first bushing and the reliability of the shape matching between the pin shaft and the second bushing through cylindrical surface matching of the pin shaft are improved, the assembly is simple, and the damage of the first structural member and the second structural member caused by the matching failure among the pin shaft, the first bushing, the second bushing, the first structural member and the second structural member in the long-term use process can be effectively avoided; on the other hand, the matching structure of the conical surfaces between the pin shaft and the first bushing and the second bushing can also play a role in reducing the risk of axial displacement of the pin shaft relative to the first bushing and/or the second bushing to a certain extent.

2. Compared with the prior art that threaded holes are formed in structural parts, the baffle plate is installed through the threaded holes matched with bolts, the pin shaft bushing assembly structure penetrates through the first structural part and the second structural part to be fixed, fastening is completed through bolts and locking nuts from two opposite sides of the first structural part and the second structural part, and through the shape matching of the first conical surfaces at two ends of the pin shaft with the second conical surfaces of the inner walls of the first bushing and the second bushing, the fastening fastness and reliability of the first structural part and the second structural part are improved, and axial movement of the pin shaft caused by damage and failure of the baffle plate and the baffle plate bolts is prevented from the source. The pin shaft bushing assembly structure of the embodiment does not need to be provided with a baffle plate or a baffle plate bolt to prevent the axial movement of the pin shaft, and is simple in structure and convenient to adjust and install.

3. According to the pin shaft bushing assembly structure, the first bushing is provided with the first axial opening part and the first radial opening part which are communicated with each other, and the second bushing is provided with the second axial opening part and the second radial opening part which are communicated with each other, so that gap adjustment can be realized, gaps among the pin shaft, the bushing and the structural member due to machining errors or mutual abrasion are compensated, assembly is convenient, tight fit among the pin shaft, the bushing and the structural member is further ensured, structural reliability is improved, and damage to the structural member caused by failure of fit among the pin shaft, the bushing and the structural member in the long-term use process of the equipment can be effectively avoided.

Drawings

In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are required to be used in some embodiments of the present utility model will be briefly described below, however, the drawings in the following description are only drawings of some embodiments of the present utility model, and other drawings may be obtained according to these drawings for those of ordinary skill in the art. Furthermore, the drawings in the following description may be regarded as schematic diagrams, not limiting the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. according to the embodiments of the present utility model.

FIG. 1 is a block diagram of a pin bushing assembly structure according to some embodiments;

FIG. 2 is a block diagram of a second bushing according to some embodiments;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a block diagram of a pin according to some embodiments;

fig. 5 is a partial enlarged view of the region C in fig. 1.

Detailed Description

The following description of the embodiments of the present utility model will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments obtained by a person skilled in the art based on the embodiments provided by the present utility model fall within the scope of protection of the present utility model.

Throughout the specification and claims, the term "comprising" is to be interpreted as an open, inclusive meaning, i.e. "comprising, but not limited to, unless the context requires otherwise. In the description of the present specification, the terms "one embodiment," "some embodiments," "example embodiments," "examples," "particular examples," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the utility model. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In describing some embodiments, expressions of "coupled" and "connected" and their derivatives may be used. The term "coupled" is to be interpreted broadly, as referring to, for example, a fixed connection, a removable connection, or a combination thereof; can be directly connected or indirectly connected through an intermediate medium. The term "coupled" means that two or more elements are in direct physical or electrical contact. The term "coupled" or "communicatively coupled" may also mean that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other. The embodiments of the utility model herein are not necessarily limited to what is described herein.

At least one of "A, B and C" has the same meaning as at least one of "A, B or C," both include the following combinations of A, B and C: a alone, B alone, C alone, a combination of a and B, a combination of a and C, a combination of B and C, and a combination of A, B and C.

"A and/or B" includes the following three combinations: only a, only B, and combinations of a and B.

As used herein, the term "if" is optionally interpreted to mean "when … …" or "at … …" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if determined … …" or "if detected [ stated condition or event ]" is optionally interpreted to mean "upon determining … …" or "in response to determining … …" or "upon detecting [ stated condition or event ]" or "in response to detecting [ stated condition or event ]" depending on the context.

The use of "adapted" or "configured to" herein is meant to be an open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

In addition, the use of "based on" is intended to be open and inclusive in that a process, step, calculation, or other action "based on" one or more of the stated conditions or values may be based on additional conditions or beyond the stated values in practice.

As used herein, "about," "approximately" or "approximately" includes the stated values as well as average values within an acceptable deviation range of the particular values as determined by one of ordinary skill in the art in view of the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system).

As used herein, "parallel", "perpendicular", "equal" includes the stated case as well as the case that approximates the stated case, the range of which is within an acceptable deviation range as determined by one of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system). For example, "parallel" includes absolute parallel and approximately parallel, where the acceptable deviation range for approximately parallel may be, for example, a deviation within 5 °; "vertical" includes absolute vertical and near vertical, where the acceptable deviation range for near vertical may also be deviations within 5 °, for example. "equal" includes absolute equal and approximately equal, where the difference between the two, which may be equal, for example, is less than or equal to 5% of either of them within an acceptable deviation of approximately equal.

Exemplary embodiments are described herein with reference to cross-sectional and/or plan views as idealized exemplary figures. In the drawings, the thickness of layers and regions are exaggerated for clarity. Thus, variations from the shape of the drawings due to, for example, manufacturing techniques and/or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of example embodiments.

In some embodiments, a pin bushing assembly structure 1000 is provided. As shown in fig. 1 to 4, the pin bushing assembly structure 1000 includes: the first structural member 1, the second structural member 2, the pin shaft 3, the first bushing 41, the second bushing 42, the bolt 51, the lock nut 52 and the two washers 53; the first structural member 1 includes a first mounting hole 10A; the second structural member 2 includes a second mounting hole 20A; the first bush 41 is located in the first mounting hole 10A; the second bushing 42 is positioned within the second mounting hole 20A; the pin shaft 3 is positioned between the first bushing 41 and the second bushing 42, and the first bushing 41 and the second bushing 42 are respectively sleeved at two ends of the pin shaft 3; the first bushing 41 includes a first bushing through hole 41A; the second bushing 42 includes a second bushing through hole 42A; the pin 3 includes a first pin through hole 30A along the length direction; the bolt 51 passes through the washer 53, the first bush through hole 41A, the first pin through hole 30A, the second bush through hole 42A, the washer and the lock nut 52 in this order from the head to the tail to fix the first structural member 1 and the second structural member 2. Wherein: the areas of the pin shaft 3, which are close to the two ends of the pin shaft 3 in the length direction, are also respectively provided with first conical surfaces 31 and 32; the first conical surface 31 is in a shrinkage trend from the shaft body of the pin shaft 3 to the end part of the pin shaft 3 in the length direction; the first bushing 41 and the second bushing 42 are also formed with second tapered surfaces 411, 421, respectively; the second tapered surfaces 411, 421 are located at the areas of the first and second bushings 41, 42 that are in contact with the first tapered surfaces 31, 32; the second conical surfaces 411, 421 are in shape fit with the first conical surfaces 31, 32 to achieve a tight fit of the first bushing 41 and the second bushing 42 with the pin 3; the first bush 41 is also formed with a first axial opening portion and a first radial opening portion that communicate with each other; the first axial opening portion extends from one end to the other end of the first bush 41 in a length direction parallel to the bolt 51, and communicates with the outer wall and the inner wall of the first bush 41; the first radial opening portion extends from the first axial opening portion to the first liner through hole 41A in the radial direction of the first liner 41, and communicates with the outer wall and the inner wall of the first liner 41; the second bush 42 is also formed with a second axial opening 422 and a second radial opening 423 communicating with each other; the second axial opening 422 extends from one end to the other end of the second bush 42 in a direction parallel to the length direction of the bolt 51, and communicates with the outer wall and the inner wall of the second bush 42; the second radial opening portion 423 extends from the second axial opening portion 422 to the second liner through hole 42A in the radial direction of the second liner 42, and communicates with the outer wall and the inner wall of the second liner 42.

The pin bushing assembly structure 1000 of the foregoing embodiment is used as follows:

the assembly method comprises the following steps: firstly, placing a first bushing 41 in a first mounting hole 10A, and assembling one end of a pin shaft 3 and the first bushing 41 in place to prop against the first end, far away from the pin shaft 3, of the first bushing 41; then, the second mounting hole 20A is arranged near the second end of the pin shaft 3, and the second bushing 42 is sleeved on the second end of the pin shaft 3 through the second mounting hole 20A; the bolt 51 is sleeved with a washer 53, and then the bolt 51 sequentially passes through the washer 53, the first bushing through hole 41A, the first pin through hole 30A, the second bushing through hole 42A, the washer and the lock nut 52, and the lock nut 52 is screwed to complete the assembly.

The disassembly method comprises the following steps: the lock nut 52 is first unscrewed to remove the bolt 51, the two washers 53 and the lock nut 52; then, the first bushing 41 is separated from the first mounting hole 10A and the pin 3, the pin 3 is separated from the second bushing 42, and finally the second bushing 42 is taken out from the second mounting hole 20A, so that the disassembly is completed.

According to the pin shaft bushing assembly structure 1000 of the foregoing embodiment, through the shape matching of the first conical surfaces 31 and 32 at the two ends of the pin shaft 3 with the second conical surfaces 411 and 421 on the inner walls of the first bushing 41 and the second bushing 42, on one hand, the closer matching between the pin shaft 3 and the first bushing 41 and the second bushing 42 is realized, and compared with the existing matching between the pin shaft and the bushings through cylindrical surfaces, the reliability of the shape matching between the pin shaft 3 and the first bushing 41 and the second bushing 42 is improved, and the assembly is simple, so that the damage of the first structural member 1 and the second structural member 2 caused by the matching failure between the pin shaft 3, the first bushing 41, the second bushing 42 and the first structural member 1 and the second structural member 2 in the long-term use process can be effectively avoided; on the other hand, the matching structure of the conical surfaces between the pin 3 and the first bush 41 and the second bush can also serve to reduce the risk of axial displacement of the pin 3 relative to the first bush 41 and/or the second bush 42 to some extent.

The pin bushing assembly structure 1000 of the foregoing embodiment passes through the washer 53, the first bushing through-hole 41A, the first pin through-hole 30A, the second bushing through-hole 42A, the washer and the lock nut 52 in order from the head to the tail by the bolt 51 to fix the first structural member 1 and the second structural member 2. Compared with the prior art that screw holes are formed in structural parts, a baffle is installed through the threaded holes matched with baffle bolts, the technical scheme of fixing the shaft bushing is that the shaft bushing assembly structure 1000 penetrates through the first structural part 1 and the second structural part 2 to be fixed, fastening is completed through bolts 51 and lock nuts 52 from two opposite sides of the first structural part 1 and the second structural part 2, the first conical surfaces 31 and 32 at two ends of the pin shaft 3 are respectively matched with the second conical surfaces 411 and 421 of the inner walls of the first bushing 41 and the second bushing 42, the fastening fastness and reliability of the first structural part 1 and the second structural part 2 are improved, and the shaft axial play caused by damage failure of the baffle and the baffle bolts is prevented from the source. The pin bushing assembly structure 1000 of the foregoing embodiment does not need to install a baffle plate or a baffle plate bolt to prevent axial movement of the pin, and has a simple structure and is convenient for adjustment and installation.

The pin bushing assembly structure 1000 of the foregoing embodiment has the first bushing 41 formed with the first axial opening portion and the first radial opening portion that are mutually communicated, and the second bushing 42 formed with the second axial opening portion 422 and the second radial opening portion 423 that are mutually communicated, so that gap adjustment can be achieved, gaps between the pin 3, the first bushing 41, the second bushing 42, the first structural member 1 and the second structural member 2 due to machining errors or mutual wear are compensated, assembly is facilitated, tight fit between the pin 3, the first bushing 41, the second bushing 42, the first structural member 1 and the second structural member 2 is further ensured, structural reliability is improved, and damage to structural members due to failure of fit between the pin, the bushing and the structural members can be effectively avoided in a long-term use process of the device.

In some embodiments, as shown in fig. 1, the first bushing 41 is also formed with a first flange portion 414; the first flange portion 414 is located at an end of the first bush 41 remote from the pin 3; the diameter of the first flange portion 414 is larger than the diameter of the first mounting hole 10A, and the first bush 41 is fitted into the first mounting hole 10A through the first flange portion 414. Therefore, the relative position of the first bushing 41 and the first mounting hole 10A can be limited through the first flange part 414, so that the first flange part 414 can be better fixed, and the axial movement of the pin shaft 3 can be prevented.

In some embodiments, as shown in fig. 1-5, second liner 42 is also formed with a second flange portion 424 and a cylindrical surface 415; the second flange portion 424 is located at an end of the second bush 42 remote from the pin 3; the diameter of the second flange portion 424 is larger than the aperture of the second mounting hole 20A. Therefore, the relative positions of the second bushing 42 and the second mounting hole 20A can be limited through the second flange part 424, so that the second flange part 424 can be fixed better, and the axial movement of the pin shaft 3 can be prevented. A predetermined distance is left between the second flange portion 424 and the second structural member 2. The cylindrical surface 415 is located on the inner wall of the second bushing 42 and extends from one end of the reduced mouth of the second conical surface 421 to the second flange portion 424. Therefore, after the pin shaft bushing assembly structure 1000 is assembled, a preset distance is reserved between the second bushing 42 close to the lock nut 52 and the second structural member 2, when the later parts are worn mutually to form a gap, the lock nut 52 can be continuously screwed, the cylindrical surface 425 of the second bushing 42 can provide a space for the pin shaft 3 to continuously move towards the inside of the second bushing 42, the resistance of the pin shaft 3 to move when the lock nut 52 is screwed is reduced, and thus the tight fit area among the first bushing 41, the second bushing 42 and the pin shaft 3 can be still ensured, and the structural reliability of the pin shaft bushing assembly structure 1000 is ensured.

In some embodiments, the first bushing 41 further includes a first bushing threaded bore; the first bushing threaded hole is provided in parallel with the first bushing through hole 41A, and penetrates an end portion of the first bushing 41 where the first flange portion 414 is located. Thus, based on the first bushing threaded hole, the first bushing 41 can be pulled out of the first mounting hole 10A by a pin puller or a jackscrew, thereby improving the convenience of the first bushing 41 to be detached.

In some embodiments, as shown in fig. 2, the second bushing 42 further includes a second bushing threaded bore 42B; the second bush screw hole 42B is provided in parallel with the second bush through hole 42A, and penetrates an end portion of the second bush 42 where the second flange portion 424 is located. Thus, the second bush 42 can be removed from the second mounting hole 20A by a pin puller or a jackscrew based on the second bush screw hole 42B, and the convenience of the second bush 42 removal is improved.

In some embodiments, the number of first bushing threaded holes is a plurality; the plurality of first bushing threaded holes are evenly distributed around the first bushing through hole 41A.

In some embodiments, as shown in fig. 2, the number of second bushing threaded holes 42B is a plurality; the plurality of second bushing threaded holes 42B are evenly distributed around the second bushing through-hole 42A.

In some embodiments, the plurality of first bushing threaded holes are arranged in an annular array centered on the first bushing through hole 41A.

In some embodiments, as shown in fig. 2, the plurality of second bushing threaded holes 42B are arranged in an annular array centered on the second bushing through hole 42A.

In some embodiments, as shown in fig. 4, the pin 3 further includes a first pin threaded hole 30B and a second pin threaded hole 30C; the first pin shaft threaded hole 30B and the second pin shaft threaded hole 30C are respectively positioned at two ends of the first pin shaft through hole 30A; and the apertures of the first pin threaded hole 30B and the second pin threaded hole 30C are larger than the aperture of the first pin through hole 30A. Therefore, based on the first pin shaft threaded hole 30B and the second pin shaft threaded hole 30C, the pin puller can be used for separating the pin shaft 3 from the first bushing 41 and the second bushing 42, and the convenience in disassembling the pin shaft 3 is improved.

In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is merely illustrative of the embodiments of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will recognize that changes and substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (10)

1. A pin bushing assembly structure, comprising: the device comprises a first structural member, a second structural member, a pin shaft, a first bushing, a second bushing, a bolt, a lock nut and two gaskets;

the first structural member comprises a first mounting hole; the second structural member comprises a second mounting hole; the first bushing is positioned in the first mounting hole; the second bushing is positioned in the second mounting hole; the pin shaft is positioned between the first bushing and the second bushing, and the first bushing and the second bushing are respectively sleeved at two ends of the pin shaft;

the first bushing includes a first bushing through-hole; the second bushing includes a second bushing through hole; the pin shaft comprises a first pin shaft through hole along the length direction; the bolt sequentially passes through the gasket, the first bushing through hole, the first pin shaft through hole, the second bushing through hole, the gasket and the lock nut from the head to the tail so as to fix the first structural member and the second structural member; wherein:

the area of the pin shaft, which is close to the two ends of the pin shaft in the length direction, is also respectively provided with a first conical surface; the first conical surface is in a shrinkage trend from the shaft body part of the pin shaft to the end part of the pin shaft in the length direction;

the first bushing and the second bushing are also respectively formed with a second conical surface; the second tapered surface is located at a region of the first bushing and the second bushing in contact with the first tapered surface; the second conical surface is matched with the first conical surface to realize the tight matching of the first bushing and the second bushing with the pin shaft;

the first bushing is further formed with a first axial opening and a first radial opening which are communicated with each other; the first axial opening part extends from one end of the first bushing to the other end along the length direction parallel to the bolt and is communicated with the outer wall and the inner wall of the first bushing; the first radial opening part extends from the first axial opening part to the first bushing through hole along the radial direction of the first bushing and is communicated with the outer wall and the inner wall of the first bushing;

the second bushing is also provided with a second axial opening and a second radial opening which are communicated with each other; the second axial opening part extends from one end of the second bushing to the other end along the length direction parallel to the bolt and is communicated with the outer wall and the inner wall of the second bushing; the second radial opening portion extends from the second axial opening portion to the second bushing through hole in a radial direction of the second bushing, and communicates an outer wall and an inner wall of the second bushing.

2. The pin bushing assembly structure of claim 1, wherein the first bushing is further formed with a first flange portion; the first flange part is positioned at one end of the first bushing, which is far away from the pin shaft; the diameter of the first flange part is larger than the aperture of the first mounting hole, and the first bushing is clamped in the first mounting hole through the first flange part.

3. The pin bushing assembly structure of claim 1, wherein the second bushing is further formed with a second flange portion and a cylindrical surface; the second flange part is positioned at one end of the second bushing, which is far away from the pin shaft; the diameter of the second flange part is larger than the aperture of the second mounting hole, and a preset interval is reserved between the second flange part and the second structural part; the cylindrical surface is positioned on the inner wall of the second bushing, and extends from one end of the shrinkage cavity of the second conical surface to the second flange part.

4. The pin bushing assembly structure of claim 2, wherein the first bushing further comprises a first bushing threaded bore; the first bushing threaded hole is parallel to the first bushing through hole and penetrates through the end portion of the first bushing where the first flange portion is located.

5. The pin bushing assembly structure of claim 3, wherein said second bushing further comprises a second bushing threaded bore; the second bushing threaded hole is arranged parallel to the second bushing through hole and penetrates through the end portion of the second bushing where the second flange portion is located.

6. The pin bushing assembly structure of claim 4, wherein the number of first bushing threaded holes is a plurality; the plurality of first bushing threaded holes are evenly distributed around the first bushing through hole.

7. The pin bushing assembly structure of claim 5, wherein the number of second bushing threaded holes is a plurality; the plurality of second bushing threaded holes are evenly distributed around the second bushing through hole.

8. The pin bushing assembly structure of claim 6, wherein a plurality of said first bushing threaded holes are arranged in an annular array centered about said first bushing through holes.

9. The pin bushing assembly structure of claim 7, wherein a plurality of said second bushing threaded holes are arranged in an annular array centered about said second bushing through holes.

10. The pin bushing assembly structure of claim 1, wherein the pin further comprises a first pin threaded hole and a second pin threaded hole; the first pin shaft threaded hole and the second pin shaft threaded hole are respectively positioned at two ends of the first pin shaft through hole; and the aperture of the first pin shaft threaded hole and the second pin shaft threaded hole is larger than the aperture of the first pin shaft through hole.