CN219570536U - Joint assembly - Google Patents

Abstract

The utility model belongs to the field of engineering machinery, and discloses a joint assembly, which comprises: the first connector comprises a first plate body, a first plate hole formed in the first plate body in a penetrating mode and a sleeve which is aligned with the first plate hole and extends perpendicular to the plate surface of the first plate body; the second connector is detachably connected with the first connector in a butt joint mode and comprises a second plate body and a bolt which is perpendicular to the plate surface of the second plate body and extends; under the butt joint state of first joint and second joint, the bolt passes first plate hole and pegging graft and fix in the sleeve, and first plate body forms the face butt joint with the second plate body. The connector assembly can better transfer alternating loads such as torque, bending moment, shearing force and the like, and effectively improves the stability of connection and the overall bearing capacity.

Description

Joint assembly

Technical Field

The utility model relates to the technical field of engineering machinery, in particular to a joint assembly.

Background

In the mechanical field, box-type structures as load-bearing members are used in large numbers in mechanical structures, and in order to meet the manufacturing requirements of some medium-and large-sized machines, it is necessary to produce long-rice-segment box-type structures having a long size. The existing long-rice section box structure can be formed by connecting two sections of box structures, the two sections of box structures are connected by adopting a flange device, but the connecting mode is only used for transmitting torque, is difficult to bear loads such as shearing force and bending moment, and is easy to fail under the bearing condition to damage the box structure.

Disclosure of Invention

In order to overcome at least one defect or deficiency in the prior art, the utility model provides a joint assembly which can better transmit alternating loads such as torque, bending moment, shearing force and the like in a bearing environment, effectively improve the stability of connection and reduce the risk of damage.

To achieve the above object, the present utility model provides a joint assembly including:

the first connector comprises a first plate body, a first plate hole formed in the first plate body in a penetrating mode and a sleeve which is aligned with the first plate hole and is perpendicular to the plate surface of the first plate body in an extending mode; and

the second connector is detachably connected with the first connector in a butt joint mode and comprises a second plate body and a bolt which is perpendicular to the plate surface of the second plate body and extends;

in the butt joint state of the first joint and the second joint, the bolt penetrates through the first plate hole and is fixedly inserted into the sleeve, and the first plate body and the second plate body form plate surface butt joint.

Optionally, in the abutting state of the first joint and the second joint, the outer peripheral wall of the plug pin and the inner peripheral wall of the sleeve form a key groove fit connection.

Optionally, in the abutting state of the first joint and the second joint, the outer peripheral wall of the plug pin and the inner peripheral wall of the first plate hole form a key groove fit connection.

Optionally, the two ends of the sleeve are respectively formed into a sleeve outer end and a sleeve inner end, and in a butt joint state of the first joint and the second joint, the sleeve inner end and the first plate body form detachable connection.

Optionally, in a butted state of the first joint and the second joint, the inner end of the sleeve is in interference fit in the first plate hole.

Optionally, the sleeve has an outer diameter at each cross-sectional location between the sleeve inner end and the sleeve outer end that is greater than the outer diameter of the sleeve inner end.

Optionally, in the abutting state of the first joint and the second joint, the end face of the inner end of the sleeve forms abutting with the plate face of the first plate body at the position of the hole periphery of the first plate hole.

Optionally, the aperture of the first plate hole is the same as the maximum outer diameter of the pin that corresponds through the first plate hole.

Optionally, two ends of the sleeve are respectively formed into a sleeve outer end and a sleeve inner end, and the sleeve inner end is fixedly connected with the first plate body in a non-detachable mode.

Optionally, two ends of the bolt are respectively formed into an outer end and an inner end of the bolt, and in a butt joint state of the first joint and the second joint, the inner end of the bolt and the second plate body form detachable connection.

Optionally, the second connector further comprises a limiting plate, the plug pin is vertically and fixedly connected to the limiting plate through the inner end of the plug pin, a second plate hole is formed in the second plate body in a penetrating mode, the plug pin penetrates through the second plate hole in the abutting state of the first connector and the second connector, and the limiting plate is in plate surface abutting connection with the second plate body.

Optionally, in the abutting state of the first joint and the second joint, the outer peripheral wall of the plug pin and the inner peripheral wall of the second plate hole form a key groove fit connection.

Optionally, two ends of the bolt are respectively formed into an outer end and an inner end of the bolt, and the inner end of the bolt is fixedly connected with the second plate body in a non-detachable mode.

Optionally, the joint assembly further comprises a reinforced locking structure for locking the latch and the sleeve in the docked state of the first joint and the second joint.

Optionally, the bolt is formed with a bolt hollow cavity, the reinforced locking structure comprises a locking pin, and the locking pin is in interference fit in the bolt hollow cavity, or the outer peripheral wall of the locking pin is in threaded fit with the inner peripheral wall of the bolt hollow cavity;

or, an external thread is formed on the peripheral wall of the bolt, and one end part of the bolt extends out of the sleeve and is in threaded fit with the lock nut.

Through above-mentioned technical scheme, first joint and second connect and realize dismantling the butt joint through the grafting cooperation of sleeve and bolt, under the bearing state, sleeve and bolt after the usable butt joint bear great load, compare with current adoption flange device, improved the bearing capacity to alternating load such as moment of flexure, shearing force after the butt joint, guarantee the stability of connection, reduce the risk of damage.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the description serve to explain, without limitation, the utility model. In the drawings:

FIG. 1 is an exploded view of a joint assembly according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a first connector according to an embodiment of the present utility model;

FIG. 3 is an exploded view of the first joint of FIG. 2 from another perspective;

FIG. 4 is an exploded view of another first joint according to an embodiment of the present utility model, wherein the inner peripheral wall of the first plate hole forms a plate hole key slot;

FIG. 5 is an exploded view of a second connector according to an embodiment of the present utility model;

FIG. 6 is an assembly view of the second joint of FIG. 5 from another perspective;

FIG. 7 is a side view of the second joint of FIG. 6;

fig. 8 is an exploded view of a box structure assembly in accordance with an embodiment of the present utility model.

Reference numerals illustrate:

1. first plate hole of first plate body 2

3. Second plate of sleeve 4

5. Pin 6 limiting plate

7. Second plate hole 8 locking pin shaft body

9. First box-type structure of locking pin cap body 10

11. Second box structure

Detailed Description

The following describes the detailed implementation of the embodiments of the present utility model with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the embodiments of the present utility model, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" or "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the positional relationship of the various components with respect to one another in the vertical, vertical or gravitational directions.

The utility model will be described in detail below with reference to the drawings in connection with exemplary embodiments.

As shown in fig. 1 to 7, a first exemplary embodiment of the present utility model provides a joint assembly including a first joint and a second joint.

The first joint includes a first plate body 1 that can be fixed to an end opening of the first box structure 10, a first plate hole 2 that is formed through the first plate body 1, and a sleeve 3 that is aligned with the first plate hole 2 and extends perpendicular to a plate surface of the first plate body 1, that is, in a state where the first joint is fixed to the first box structure 10, one plate surface of the first plate body 1 is fixed to the end opening of the first box structure 10, and a sleeve 3 that is perpendicular to the plate surface extends on the plate surface, and of course, the sleeve 3 can be fixed to the first plate body 1 and forms a first through hole that penetrates the first plate body 1 in an aligned manner with the first plate hole 2, so that the first joint can be formed as an end joint of the first box structure 10.

The second joint includes a second plate body 4 capable of being fixed to the end opening of the second box structure 11 and a bolt 5 extending perpendicular to the plate surface of the second plate body 4, that is, in a state where the second joint is fixed to the second box structure 11, one plate surface of the second plate body 4 is fixed to the end opening of the second box structure 11, and the other plate surface is extended outwards to form a bolt 5 perpendicular to the plate surface, and of course, the bolt 5 can be fixed to the second plate body 4, so that the second joint can be formed as an end joint of the second box structure 11. By means of the plug-in matching relation between the plug pin 5 and the sleeve 3, the second connector and the first connector can be detachably connected, specifically, in the state that the first connector and the second connector are connected in a butt joint mode, the plug pin 5 can penetrate through the first plate hole 2 and be fixedly plugged in the sleeve 3, and the first plate body 1 and the second plate body 4 form plate surface butt joint.

Through above-mentioned technical scheme, the first joint and the second joint realize dismantling the butt joint through the grafting cooperation of sleeve 3 and bolt 5 to can make first box structure and second box structure dock fixedly, under the bearing state, sleeve and bolt after the usable butt joint bear great load, compare with current adoption flange device bolted connection, improve the box structure after the butt joint to moment of torsion, axial force, alternating load's such as shear force bearing capacity, guarantee the stability of connection, reduce the risk of damage.

In one embodiment, the sleeve 3 is formed with an outer sleeve end and an inner sleeve end, respectively, which forms a detachable connection with the first plate 1 in the docked state of the first joint and the second joint. Specifically, the inner end of the sleeve can be detachably inserted and fixed in the first plate hole 2, and the end face of the inner end of the sleeve can be directly butted with the plate face of the first plate body 1, whether the sleeve is inserted or directly butted, and in the butted state of the first joint and the second joint, the second joint can simultaneously pass through the bolt 5 to fix the first plate body 1 and the sleeve 3. Overall, the sleeve 3 and the first plate body 1 are detachably connected, so that the sleeve 3 can be replaced, maintained and the like according to actual conditions, the universality of the first joint is improved, for example, the sleeve 3 with the inner ends of the sleeves in different shapes and sizes can be replaced adaptively, and the convenience is high.

In one embodiment, in the abutting state of the first joint and the second joint, the inner end of the sleeve is in interference fit in the first plate hole 2. Specifically, the outer diameter of the inner end of the sleeve can be set to be larger than the maximum aperture of the first plate hole 2, and when the inner end of the sleeve is inserted into the first plate hole 2, the sleeve 3 and the first plate body 1 can be fixedly connected through interference fit between the inner end of the sleeve and the first plate hole 2, so that the strength and stability of connection between the first joint and the second joint can be enhanced.

Further, in order to enhance the effectiveness of the connection between the first connector and the second connector, the outer diameter of the sleeve 3 at each section position between the inner end of the sleeve and the outer end of the sleeve is larger than the outer diameter of the inner end of the sleeve, specifically, the outer diameter of the sleeve 3 gradually increases from the inner end of the sleeve to the outer end of the sleeve, so that the relative positions of the sleeve 3 and the first plate body 1 can be limited, and the first plate body 1 cannot move towards the outer end of the sleeve after being inserted. In other embodiments, the sleeve 3 may also be formed as a large outer diameter section and a small outer diameter section, and correspondingly, the inner end of the sleeve is located at the small outer diameter section and the outer end of the sleeve is located at the large outer diameter section, whereby the displacement of the first plate body 1 can be restricted by the large outer diameter section. Furthermore, the large outer diameter section and the small outer diameter section may each be provided with an outer diameter gradually increasing, whereby the smoothness of the connection of the sleeve 3 with the first plate body 1 can be enhanced.

In one embodiment, in the abutting state of the first joint and the second joint, the end face of the inner end of the sleeve forms an abutting joint with the plate face of the first plate body 1 at the position of the hole periphery of the first plate hole 2, that is, the outer diameter of the inner end of the sleeve can be set to be larger than the maximum aperture of the first plate hole 2, and under the condition that the inner end of the sleeve is not inserted into the first plate hole 2, the first plate body 1 is pressed by the second joint, so that the end face of the inner end of the sleeve forms an abutting joint with the plate face at the position of the hole periphery of the first plate hole 2, and meanwhile, the end face of the inner end of the sleeve can limit the first plate body 1, so that the first plate body 1 is ensured not to move towards the outer end direction of the sleeve.

Further, the aperture of the first plate hole 2 is the same as the maximum outer diameter of the bolt 5 correspondingly passing through the first plate hole 2, so that the outer peripheral wall of the bolt 5 can be abutted against the inner peripheral wall of the first plate hole 2 in the abutting state of the first joint and the second joint, and the relative displacement of the first joint and the second joint along the radial direction can be avoided through the limit action of the first plate body 1 on the bolt 5, and the connection stability of the first joint and the second joint is improved.

In one embodiment, two ends of the sleeve 3 are respectively formed into an outer end and an inner end of the sleeve, the inner end of the sleeve is fixedly connected with the first plate 1 in a non-detachable manner, for example, an end face of the inner end of the sleeve can be fixedly connected with a plate face of the first plate 1 through a processing manner such as welding, and the sleeve 3 and the first plate 1 can be integrally formed through a stamping manner, a 3D printing manner and the like, so that the connection stability and the load capacity of the sleeve 3 and the first plate 1 can be enhanced.

In one embodiment, two ends of the bolt 5 are respectively formed into a bolt outer end and a bolt inner end, in a butt joint state of the first joint and the second joint, the bolt inner end and the second plate body 4 form detachable connection, for example, the bolt 5 is vertically and fixedly connected to the limiting plate 6 through the bolt inner end, a second plate hole 7 is formed in the second plate body 4 in a penetrating manner, the bolt 5 penetrates through the second plate hole 7 in a butt joint state of the first joint and the second joint, the limiting plate 6 and the second plate body 4 form plate surface butt joint, therefore, the bolt 5 can be limited through the limiting plate 6, the bolt inner end is prevented from being separated from the second plate hole 7, the universality of the second joint can be enhanced, the bolt 5 can be conveniently replaced, maintained and the like, and the convenience of joint assembly is improved.

Further, in the abutting state of the first joint and the second joint, the outer peripheral wall of the plug pin 5 and the inner peripheral wall of the second plate hole 7 form a key groove fit connection. Specifically, as shown in fig. 5, the outer peripheral wall of the pin 5 forms a convex pin key along the circumferential direction, and the inner peripheral wall of the second plate hole 7 forms a plate hole key slot corresponding to the pin key one to one along the circumferential direction, so that in the state that the pin 5 is inserted in the second plate hole 7, the pin key and the plate hole key slot are matched, so that the pin 5 and the second plate body 4 are limited, the pin 5 and the second plate body 4 are prevented from rotating relatively, the stability of connection is improved, and the bearing capacity of the joint assembly of the present exemplary embodiment on torque load is enhanced.

In one embodiment, two ends of the bolt 5 are respectively formed into a bolt outer end and a bolt inner end, the bolt inner end is fixedly connected with the second plate 4 in a non-detachable manner, for example, an end face of the bolt inner end can be fixedly connected with a plate face of the second plate 4 in a welding or other processing manner, and the bolt 5 and the second plate 4 can be integrally formed in a punching, 3D printing or other manner, so that the connection stability and the load capacity of the bolt 5 and the second plate 4 can be enhanced.

In one embodiment, in the abutting state of the first joint and the second joint, the outer peripheral wall of the plug pin 5 and the inner peripheral wall of the sleeve 3 form a key groove fit connection. Specifically, the outer peripheral wall of the plug 5 forms the convex plug key, and the inner peripheral wall of the sleeve 3 forms the sleeve keyway that corresponds with the plug key, from this, under the state that the plug 5 alternates in the sleeve 3, the cooperation of accessible plug key and sleeve keyway is spacing to plug 5 and sleeve 3, prevents that plug 5 and sleeve 3 from taking place relative rotation, promotes the stability of connection, strengthens the bearing capacity of the joint assembly of this exemplary embodiment to the moment of torsion load.

Further, a plurality of bolt keys are formed on the outer peripheral wall of the bolt 5, and a plurality of sleeve key grooves are formed on the inner peripheral wall of the sleeve 3, wherein the plurality of sleeve key keys are arranged in one-to-one correspondence with the plurality of bolt keys. Under the butt joint state of the first joint and the second joint, the plurality of latch keys are matched with the plurality of sleeve key grooves in a one-to-one correspondence mode, namely spline matching is formed, and stress in all directions can be effectively applied.

In one embodiment, in order to enhance the stability of the abutting connection of the first joint and the second joint, as shown in fig. 4, in the abutting state of the first joint and the second joint, the outer peripheral wall of the plug pin 5 and the inner peripheral wall of the first plate hole 2 form a key groove fit connection. Specifically, the outer peripheral wall of the bolt 5 is formed with a bolt key, and the inner peripheral wall of the first plate hole 2 is formed with a plate hole key groove corresponding to the bolt key, so that under the state that the bolt 5 penetrates through the first plate hole 2, the bolt 5 and the first plate body 1 are relatively limited through the cooperation of the bolt key and the plate hole key groove, the bolt 5 and the first plate body 1 are prevented from relatively rotating, and the connection stability is improved.

Further, a plurality of bolt keys are formed on the outer peripheral wall of the bolt 5, and a plurality of plate hole key grooves are formed on the inner peripheral wall of the first plate hole 2, wherein the plurality of bolt keys are arranged in a one-to-one correspondence manner. Under the butt joint state of first joint and second joint, a plurality of latch key and a plurality of plate hole keyway one-to-one cooperation form the spline cooperation promptly, can more effectively respond to the atress of all directions.

Preferably, the plurality of keys and the grooves are all uniformly distributed along the circumferential direction.

In an alternative embodiment, the connection between the first connector and the second connector is stabilized by the plug-in engagement of the plug pin 5 with the sleeve 3, for example by the plug pin 5 being plugged into the sleeve 3 in an interference manner. However, in order to further improve the connection reliability and the convenience of the joint disassembly, a reinforcing locking structure may be further provided in the joint assembly of the present exemplary embodiment, with which the plug pin 5 and the sleeve 3 are locked to each other so as not to be released from the sleeve 3.

As an embodiment of the reinforcing locking structure, the bolt 5 is formed with a bolt hollow cavity, the reinforcing locking structure comprises a locking pin, the locking pin is in interference fit in the bolt hollow cavity, or the outer peripheral wall of the locking pin is in threaded fit with the inner peripheral wall of the bolt hollow cavity, so that the first joint and the second joint can be locked.

In one embodiment, the locking pin comprises a locking pin shaft body 8, the inner end and the outer end of which are respectively formed into a shaft body inner end and a shaft body outer end, and a locking pin cap body 9 fixedly connected to the shaft body outer end, wherein the shaft body inner end is detachably inserted and fixed in a bolt hollow cavity, and the locking pin cap body 9 is in limiting abutting joint with the outer end face of the sleeve 3 along the axial direction in the state that the bolt 5 is inserted in the sleeve 3. From this, the locking pin body 8 can be worn to link sleeve 3 and bolt 5 by the axis body inner end, until locking pin cap body 9 and the outer terminal surface butt of sleeve 3 to can lock spacing between bolt 5 and locking pin cap body 9 with sleeve 3, guarantee the locking state of bolt 5 and sleeve 3. When the locking pin shaft body 8 is in threaded fit with the hollow cavity of the bolt, a bolt can be used as the locking pin, and at the moment, the nut of the bolt is the locking pin cap body 9.

In the case that the plug 5 is not formed with a hollow cavity therein, a locking pin of another mounting manner may be used to lock the plug 5 and the sleeve 3. For example, two locking holes aligned with each other are respectively formed in the peripheral walls of the plug pin 5 and the sleeve 3, and the two locking holes are connected by the locking pin, so that the plug pin 5 and the sleeve 3 can be locked.

In an alternative embodiment, in the case that the plug 5 is not formed with a hollow cavity of the plug, the first joint and the second joint may be locked by providing external threads on the outer peripheral wall of the plug 5 to cooperate with the lock nut. Specifically, when the plug 5 is inserted into the sleeve 3, one end of the plug 5 protrudes outside the sleeve 3, and the lock nut is engaged with the external thread at the end of the plug 5.

In order to be convenient for install the locking pin, the peripheral wall of the first box structure 10 can be penetrated and formed with the dismouting of dodging the mouth with the tip opening intercommunication of first box structure 10 in order to dodge the locking pin dismouting, and the position that the dismouting dodges the mouth is as close as possible to the tip opening of first box structure 10, and under the state that the tip opening of first box structure 10 was closed by first plate body 1 like this, operating personnel can dodge the mouth from the dismouting and touch the sleeve 3 that stretches into in the first box structure 10 to the dismouting of locking pin is convenient for.

In one embodiment, the first joint comprises a plurality of first plate holes 2 and a plurality of sleeves 3, and correspondingly, the second joint comprises a plurality of bolts 5 corresponding to the plurality of sleeves 3 one by one, so that in the abutting state of the first joint and the second joint, the plurality of bolts 5 can be fixedly spliced with the plurality of sleeves 3 one by one, thereby enhancing the stability of connection, improving the overall load capacity and ensuring the operation safety.

As shown in fig. 8, the second exemplary embodiment of the present utility model provides a box structure assembly, which includes a first box structure 10, a second box structure 11 and the above-mentioned joint assembly, and the first box structure 10 and the second box structure 11 can be connected by the joint assembly, and obviously, the box structure assembly has all technical effects brought by the joint assembly, so that the description thereof will not be repeated here.

The foregoing details of the optional implementation of the embodiment of the present utility model have been described in detail with reference to the accompanying drawings, but the embodiment of the present utility model is not limited to the specific details of the foregoing implementation, and various simple modifications may be made to the technical solution of the embodiment of the present utility model within the scope of the technical concept of the embodiment of the present utility model, and these simple modifications all fall within the protection scope of the embodiment of the present utility model.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.

In addition, any combination of various embodiments of the present utility model may be performed, so long as the concept of the embodiments of the present utility model is not violated, and the disclosure of the embodiments of the present utility model should also be considered.

Claims (15)

1. A connector assembly, the connector assembly comprising:

the first joint comprises a first plate body (1), a first plate hole (2) formed in the first plate body (1) in a penetrating mode, and a sleeve (3) aligned with the first plate hole (2) and extending perpendicular to the plate surface of the first plate body (1); and

the second connector is detachably connected with the first connector in a butt joint mode and comprises a second plate body (4) and a bolt (5) which is perpendicular to the plate surface of the second plate body (4) and extends;

in the butt joint state of the first joint and the second joint, the bolt (5) passes through the first plate hole (2) and is fixedly inserted into the sleeve (3), and the first plate body (1) and the second plate body (4) form plate surface butt joint.

2. Joint assembly according to claim 1, characterized in that in the docked state of the first joint and the second joint, the outer peripheral wall of the plug pin (5) forms a keyway-fit connection with the inner peripheral wall of the sleeve (3).

3. Joint assembly according to claim 2, characterized in that in the docked state of the first joint and the second joint, the outer peripheral wall of the plug pin (5) forms a keyway mating connection with the inner peripheral wall of the first plate hole (2).

4. Joint assembly according to claim 1, characterized in that the sleeve (3) is formed with an outer sleeve end and an inner sleeve end, respectively, which sleeve inner end forms a detachable connection with the first plate body (1) in the docked state of the first joint and the second joint.

5. The joint assembly according to claim 4, wherein in the butted state of the first joint and the second joint, the sleeve inner end is in interference fit in the first plate hole (2).

6. Joint assembly according to claim 5, wherein the sleeve (3) has an outer diameter at each cross-sectional position between the sleeve inner end and the sleeve outer end that is larger than the outer diameter of the sleeve inner end.

7. The joint assembly according to claim 4, wherein in the butted state of the first joint and the second joint, the end face of the inner end of the sleeve forms a butt joint with the plate face of the first plate body (1) at the hole peripheral edge position of the first plate hole (2).

8. The joint assembly according to claim 7, wherein the aperture of the first plate hole (2) is the same as the maximum outer diameter of the plug pin (5) that corresponds through the first plate hole (2).

9. Joint assembly according to claim 1, characterized in that the sleeve (3) is formed with an outer sleeve end and an inner sleeve end, respectively, which sleeve inner end is fixedly connected non-detachably to the first plate body (1).

10. Joint assembly according to claim 1, characterized in that the two ends of the pin (5) are formed as an outer pin end and an inner pin end, respectively, which in the docked state of the first joint and the second joint forms a detachable connection with the second plate body (4).

11. The joint assembly according to claim 10, wherein the second joint further comprises a limiting plate (6), the plug pin (5) is vertically and fixedly connected to the limiting plate (6) through the inner end of the plug pin, a second plate hole (7) is formed in the second plate body (4) in a penetrating mode, in the abutting state of the first joint and the second joint, the plug pin (5) penetrates through the second plate hole (7), and the limiting plate (6) and the second plate body (4) form plate surface abutting.

12. Joint assembly according to claim 11, characterized in that in the docked state of the first joint and the second joint, the outer peripheral wall of the plug pin (5) forms a keyway-fit connection with the inner peripheral wall of the second plate hole (7).

13. Joint assembly according to claim 1, characterized in that the two ends of the pin (5) are formed as an outer pin end and an inner pin end, respectively, which inner pin end is fixedly connected to the second plate body (4) non-detachably.

14. Joint assembly according to any of claims 1 to 13, further comprising a reinforcing locking structure for locking the plug pin (5) and the sleeve (3) in the docked state of the first joint and the second joint.

15. Joint assembly according to claim 14, characterized in that the plug pin (5) is formed with a plug pin hollow cavity, the reinforcing locking structure comprising a locking pin which is interference-inserted in the plug pin hollow cavity or whose peripheral wall is in threaded engagement with the inner peripheral wall of the plug pin hollow cavity;

or, an external thread is formed on the peripheral wall of the bolt (5), and one end part of the bolt (5) extends out of the sleeve (3) to form threaded fit with the lock nut.