Assembling device for connection of reinforcing steel bar and connecting sleeve

Abstract

The utility model belongs to the technical field of engineering construction, and particularly relates to an assembling device for connecting a reinforcing steel bar and a connecting sleeve, which comprises a first seat body and a second seat body which do linear displacement close to each other and far away from each other, and an abutting sleeve extending towards the side where the second seat body is located is arranged on the arm portion of the first seat body on the first seat body. A second seat body arm portion of the second seat body is provided with a reducing sleeve, the abutting sleeve and the reducing sleeve are concentrically arranged, mandrels of the abutting sleeve and the reducing sleeve are parallel to the linear displacement direction of the first seat body and the second seat body, an inner pipe cavity of the reducing sleeve comprises a taper pipe cavity arranged close to the first seat body, and the large-diameter end of the taper pipe cavity is arranged close to the first seat body. The minimum inner diameter of the taper pipe cavity is larger than or equal to the outer diameter of the abutting sleeve. The assembling device is simple in structure and convenient to operate, and the finished product rate of steel bar connection operation on the construction site can be guaranteed while the stability and reliability of the assembling device are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of engineering construction technology, especially relates to a kind of assembly device of reinforcing bar and connecting sleeve connection. BACKGROUND

[0002] Due to the advantages of flexible operation in narrow space, fast connection, convenient maintenance and repair of connection node, the method of applying metal sleeve mechanical connection to two reinforcing bars has been widely applied.

[0003] The prior art such as Chinese patent CN113898126A discloses a reinforcing bar axial cold extrusion mechanical connecting sleeve and special tool, the mechanical connecting sleeve includes an inner sleeve, an outer sleeve and an extrusion sleeve, the inner sleeve is a multi-petal structure, the outer sleeve is sleeved on the outer periphery of the inner sleeve and has a flange at one end, and the inner diameter of the extrusion sleeve is smaller than the outer diameter of the outer sleeve; during coupling processing, the outer sleeve flange abuts against the fixed arm of the special tool, the extrusion sleeve is displaced from the other end of the outer sleeve to approach the outer sleeve flange under the action of the sliding head of the special tool, the outer sleeve is extruded when displaced, the outer sleeve shrinks along the radial direction and extrudes the inner sleeve, and then the two reinforcing bars are integrated with the entire sleeve assembly. This connecting sleeve is a multi-layer nested structure, and the operation of installing the inner sleeve, the outer sleeve and the extrusion sleeve is relatively complicated, and the coaxiality requirement of the installation of each layer of sleeve is also relatively high. During on-site construction, if foreign matter enters the gap between the sleeves or the coaxial posture of the sleeves cannot be well maintained, the displacement of the extrusion sleeve will be blocked, and the effective connection of the sleeve assembly and the reinforcing bars cannot be achieved, which increases the difficulty and reduces the efficiency of on-site construction.

[0004] The Chinese patent CN218406070U discloses an axial steel bar connecting piece and an extrusion tool. The axial steel bar connecting piece includes a straight-cylindrical connecting sleeve, and steel bars are inserted into a connecting hole in the middle of the connecting sleeve from both axial ends. The extrusion tool includes an upper jaw and a lower jaw, and a locking sleeve is detachably connected in each of the upper jaw and the lower jaw. The inner hole of the locking sleeve is conical. The upper jaw and the lower jaw are provided with limiting blocks at the ends away from the extrusion channel. The two limiting blocks are symmetrically arranged about the center of the extrusion channel to ensure that the connecting sleeve is thickened and reinforced at the center position after extrusion, thereby ensuring the stability of the connection of the two steel bars. During extrusion, the hydraulic cylinder drives the upper jaw to move towards the lower jaw, and one end of the connecting sleeve is pushed into the lower jaw, and the other end is continuously extruded by the upper jaw. When the one end reaches the limiting block, it is stopped and prevented from moving towards the other end. Then, the upper jaw and the lower jaw contact to complete the circumferential extrusion of the connecting sleeve. The connecting sleeve obtained by extrusion is in the shape of an axial pipe with a large outer diameter in the middle and small outer diameters at both ends. However, it is difficult to ensure that the thickened and reinforced section is located in the middle of the connecting sleeve during on-site construction. The operator cannot observe the connection position of the two steel bars from the outside of the connecting sleeve, and thus cannot ensure that the thickened and reinforced section of the connecting sleeve is located at the connection gap between the two steel bars. The quality of the steel bar connection cannot be effectively guaranteed. Content of the utility model

[0005] The utility model aims at providing an assembly device for connecting steel bars and a connecting sleeve, which is simple to operate and stable and reliable in connection quality.

[0006] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of an assembly device for connecting steel bars and a connecting sleeve, which comprises first and second seat bodies that move linearly towards or away from each other. The first seat body arm part of the first seat body has a butting sleeve extending towards the side where the second seat body is located. The second seat body arm part of the second seat body is provided with a reduced-diameter sleeve. The butting sleeve and the reduced-diameter sleeve are concentrically arranged, and the shafts of the two are parallel to the linear displacement direction of the first and second seat bodies. The inner tube cavity of the reduced-diameter sleeve comprises a tapered tube cavity arranged adjacent to the first seat body. The large-diameter end of the tapered tube cavity is arranged adjacent to the first seat body. The minimum inner diameter of the tapered tube cavity is greater than or equal to the outer diameter of the butting sleeve.

[0007] Compared with the prior art, the utility model has the following technical effects: during use, the butting sleeve butts against the connecting sleeve to limit its axial displacement, and then the reduced-diameter sleeve is driven to displace towards the butting sleeve. The tapered tube cavity of the reduced-diameter sleeve can exert a radially inward force on the connecting sleeve to make it shrink and deform to wrap the steel bar, thereby achieving reliable connection of the steel bar. The assembly device is simple in structure and convenient to operate, and can guarantee the stability and reliability of the assembly device itself while also ensuring the yield rate of steel bar connection operations on the construction site. BRIEF DESCRIPTION OF DRAWINGS

[0008] The content expressed by each figure in the specification and the labels in the figures are briefly described as follows:

[0009] Figure 1 is a perspective view of an embodiment;

[0010] Figure 2 is a perspective view of an embodiment with the abutting sleeve and the reducing sleeve hidden;

[0011] Figure 3 is a semi-perspective view of an embodiment with the abutting sleeve and the reducing sleeve hidden;

[0012] Figure 4 is a semi-perspective view of an embodiment in use with the first seat and the second seat in an initial position;

[0013] Figure 5 is a semi-perspective view of an embodiment in use with the first seat and the second seat in a final position;

[0014] Figure 6 , 7 is a perspective view of an abutting sleeve;

[0015] Figure 8 is a semi-perspective view of an abutting sleeve in a separated state;

[0016] Figure 9 , 10 is a perspective view of a reducing sleeve;

[0017] Figure 11 is a semi-perspective view of a reducing sleeve in a separated state. DETAILED DESCRIPTION

[0018] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings.

[0019] The assembly device for connecting a reinforcing bar and a connecting sleeve comprises a first seat 10 and a second seat 20 which are displaced linearly towards or away from each other, a first seat arm 11 of the first seat 10 is provided with an abutting sleeve 30 extending towards the side where the second seat 20 is located, a second seat arm 21 of the second seat 20 is provided with a reducing sleeve 40, the abutting sleeve 30 and the reducing sleeve 40 are arranged concentrically and the shafts of the two sleeves are parallel to the linear displacement direction of the first seat 10 and the second seat 20, an inner tube cavity of the reducing sleeve 40 comprises a taper tube cavity 41 arranged adjacent to the first seat 10, a large diameter end of the taper tube cavity 41 is arranged adjacent to the first seat 10, and the minimum inner diameter of the taper tube cavity 41 is greater than or equal to the outer diameter of the abutting sleeve 30.

[0020] In this embodiment, the power source for the first seat 10 and the second seat 20 is a hydraulic cylinder. The first seat 10 and the cylinder body form a synchronous displacement, and the second seat 20 and the piston cylinder form a synchronous displacement. The relative displacement direction between the piston cylinder and the cylinder body of the hydraulic cylinder is the linear displacement direction of the first seat 10 and the second seat 20. In other embodiments, other commonly used power equipment can also be used as the power source. This embodiment is used as shown in the attached diagram. Figure 4 , 5 As shown, two reinforcing bars B are respectively inserted into the cavities of the abutment sleeve 30 and the reducing sleeve 40. The connecting ends of the two reinforcing bars B are located between the abutment sleeve 30 and the reducing sleeve 40 and are inserted into the cavity of the connecting sleeve A. Based on this, the first seat 10 and the second seat 20 are displaced towards each other, and the abutment sleeve 30 and the reducing sleeve 40, which are respectively located on the two seats, are also displaced towards each other, and the distance between them decreases. After one end of the connecting sleeve A abuts against the abutment sleeve 30, the reducing sleeve 40 covers the other end of the connecting sleeve A. As the distance between the abutment sleeve 30 and the reducing sleeve 40 decreases, the connecting sleeve A, which passes through the reducing sleeve 40, is deformed by the radial force applied to it by the tapered cavity 41 and tightly wraps the reinforcing bar B, thereby achieving a fixed connection between the reinforcing bar B and the connecting sleeve A. In this embodiment, the second seat 20 with the reduced diameter sleeve 40 is fixedly connected to the piston cylinder. Therefore, during the connection operation, the positions of the abutment sleeve 30 and the connecting sleeve A are fixed. The reduced diameter sleeve 40 moves radially towards the abutment sleeve 30 along the connecting sleeve A to achieve the connection between the steel bar B and the connecting sleeve A. In other embodiments, the reduced diameter sleeve 40 can also be kept fixed, and the abutment sleeve 30 can be driven to push the connecting sleeve A to the side where the reduced diameter sleeve 40 is located to complete the steel bar sleeve connection operation.

[0021] To compress the entire body of the connecting sleeve A, the small-diameter end of the tapered cavity 41 of the reducing sleeve 40 should be able to move from one end of the connecting sleeve A to the other and separate from the connecting sleeve A. However, the abutment sleeve 30 abuts against the displacement end of the reducing sleeve 40. Therefore, given that the outer diameter of the abutment sleeve 30 is smaller than the inner diameter of the small-diameter section of the tapered cavity 41, the axial dimension of the sleeve body exposed on the outside of the first seat arm 11 of the abutment sleeve 30 should be larger than the axial dimension of the tapered cavity 41. Thus, as shown in the attached... Figure 5 As shown, after processing is completed, the connecting sleeve A is located outside the small diameter end of the tapered cavity 41 of the reduced diameter sleeve 40. The workpiece that has completed the connection operation can be separated from the assembly device by pulling it out along the axial direction of the reduced diameter sleeve 40.

[0022] When the first seat body 10 and the second seat body 20 move towards each other, the abutment sleeve 30 and the reducing sleeve 40 first need to withstand the same axial force. On this basis, the reducing sleeve 40 also needs to compress the sleeve A to be connected, causing it to shrink and deform, thus requiring greater strength. For ease of production and processing, in this embodiment, the abutment sleeve 30 and the reducing sleeve 40 are made of the same material. To ensure that the sleeve strength of the reducing sleeve 40 meets the requirements, the reducing sleeve 40 should have a larger wall thickness, especially the wall thickness of the tapered cavity 41 of the reducing sleeve should be greater than the wall thickness of the abutment sleeve 30. Similarly, the second seat body arm 21 should also provide a stronger radial limiting effect for the reducing sleeve 40. Therefore, when the abutment sleeve 30 and the reducing sleeve 40 are arranged concentrically, in this embodiment, the overhanging end face of the second seat body arm 21 is located outside the first seat body arm 11, that is, the overhanging arm end of the second seat body arm 21 is located outside the overhanging arm end of the first seat body arm 11.

[0023] In order to meet the connection of steel bars B with different outer diameters, in this embodiment, the top sleeve 30 is detachably connected to the first seat arm 11, and the diameter reduction sleeve 40 is detachably connected to the second seat arm 21.

[0024] Specifically, the end of the abutment sleeve 30 furthest from the second seat 20 has an external abutment sleeve protrusion 31. The abutment sleeve protrusion 31 and the first seat arm 11 form a detachable insert fit. When the abutment sleeve protrusion 31 is inserted into the first seat arm 11, it forms a limiting fit with the first seat arm 11 in the linear displacement direction of the seat. In this embodiment, the installation and removal direction of the abutment sleeve protrusion 31 on the first seat arm 11 is perpendicular to the linear displacement direction of the seat. (See attached...) Figure 2 , 3 As shown, the first seat arm 11 is provided with a limiting groove 112. The groove depth direction and groove opening direction of the limiting groove 112 are perpendicular to the linear displacement direction of the seat. The limiting groove 112 includes an external guide section 112a and an internal positioning section 112b. The guide section 112a is a straight groove, and the positioning section 112b is an arc-shaped groove. The limiting groove 112 formed by the guide section 112a and the positioning section 112b has an overall U-shaped groove length. (See attached image) Figure 6 , 7 As shown in Figure 8, the cross-sectional shape of the abutment sleeve convex ring 31 matches the cross-sectional shape of the groove cavity of the limiting groove 112. The outer peripheral surface of the abutment sleeve convex ring 31 includes two parallel and oppositely arranged guide surfaces 32. The guide surfaces 32 are displaced into or out of the limiting groove 112 under the guidance of the guide section 112a of the limiting groove 112. The groove depth of the positioning section 112b is less than or equal to the protrusion dimension of the abutment sleeve convex ring 31. In this way, when the inner end of the abutment sleeve convex ring 31 is in contact with the bottom of the groove of the positioning section 112b, the groove wall of the limiting groove 112 will not block the middle tube hole of the abutment sleeve 30.

[0025] In the preferred embodiment, the limiting groove 112 is arranged adjacent to the second seat 20. (See attached diagram.) Figure 4As shown, the arm body thickness far from the second seat body 20 side is greater than the arm body thickness adjacent to the second seat body 20 side, obviously, the arm body thickness far from the second seat body 20 side can provide reliable axial support for the abutting sleeve 30, so that the first seat body arm part 11 with smaller size can meet the use requirements.

[0026] The assembly device shown in the drawings is vertically arranged, and the abutting sleeve 30 in the upper position is embedded and inserted with the limiting groove 112 whose opening is perpendicular to the linear displacement direction of the seat body, which can effectively prevent the abutting sleeve 30 from falling, thereby maintaining its installation posture. In another embodiment, if the assembly device is operated horizontally or horizontally, the abutting sleeve 30 can also be embedded and inserted in the first seat body arm part 11 along the axial direction of the sleeve body. However, due to the larger axial size of the abutting sleeve 30, in order to avoid the abutting sleeve 30 from being skewed during work, it is necessary to increase the embedded and inserted depth of the abutting sleeve 30 in the first seat body arm part 11 in the axial direction, increase the volume of the first seat body arm part 11, and make the first seat body 10 or the assembly device more bulky, thereby reducing the portability of the assembly device.

[0027] In this embodiment, the abutting sleeve collar 31 and the first seat body arm part 11 have a mating surface perpendicular to the linear displacement direction of the seat body, in order to avoid the first seat body arm part 11 from being twisted, the mating surface is symmetrically arranged relative to the central surface of the first seat body arm part 11 in the width direction, which makes the first seat body arm part 11 bear force evenly in the width direction of the first seat body arm part 11, thereby avoiding uneven force on both sides of the overall U-shaped mating surface, and ensuring the stability and reliability of the assembly device during operation.

[0028] As shown in the drawings, Figure 4 , 5 As shown, the reduced diameter sleeve 40 is displaced from bottom to top to drive the connection sleeve A to deform, and the upper end surface of the connection sleeve A can have a deformed protruding part. In this embodiment, in order to ensure that the reduced diameter sleeve 40 can smoothly guide and deliver to the outer periphery of the abutting sleeve 30, the end surface of the abutting sleeve 30 adjacent to the second seat body 20 is transitionally connected to the sleeve body outer periphery surface in the form of a large outer small inner taper surface and a cylindrical surface, wherein the side adjacent to the second seat body 20 is the outer side, and the side far from the second seat body 20 is the inner side, that is, the taper surface shown in the drawings is small at the top and large at the bottom. In actual application, the taper surface and the end surface adjacent to the connection sleeve A can form a part that can accommodate the deformed protrusion of the connection sleeve A, thereby avoiding the reduced diameter sleeve 40 from being stuck when displaced to this part, and avoiding difficulty in separating from the connection sleeve A. Figure 8

[0029] Specifically, the reduced diameter sleeve 40 and the second seat body arm part 21 constitute detachable embedded and inserted cooperation in the linear displacement direction of the seat body. When the reduced diameter sleeve 40 is embedded in the second seat body arm part 21, the displacement of the reduced diameter sleeve 40 far from the first seat body 10 and perpendicular to the linear displacement direction of the seat body is limited by the second seat body arm part 21. As shown in the drawings, Figure 2 , 3 ​As shown in Figure 4, the second seat arm 21 is recessed inward on the wall surface adjacent to the first seat 10 to form a cavity 212. The cavity wall of the cavity 212 matches the outer contour of the reduced diameter sleeve 40 to ensure reliable positioning of the reduced diameter sleeve 40 in the axial direction of its body during installation. The recess depth of the cavity 212 is less than or equal to the axial dimension of the reduced diameter sleeve 40. In this embodiment, the recess depth of the cavity 212 is equal to the axial dimension of the reduced diameter sleeve 40, that is, in the installed state, the upper surface of the reduced diameter sleeve 40 adjacent to the first seat 10 is flush with the upper surface of the second seat arm 21. The cavity 212 has a countersunk platform 213 facing the first seat 10. The countersunk platform 213 abuts against the bottom surface of the reduced diameter sleeve 40, restricting the displacement of the reduced diameter sleeve 40 in the recess direction of the cavity 212. The cavity wall of the concave cavity 212 adjacent to the second seat arm 21 is a limiting wall 214 with its wall surface facing the connecting end of the second seat arm 21. The limiting wall 214 abuts against the outer wall surface of the reduced diameter sleeve 40 to restrict the displacement of the reduced diameter sleeve 40 away from the connecting end of the second seat arm 21.

[0030] In this embodiment, the insertion direction of the abutment sleeve 30 on the first seat arm 11 is consistent with the extension direction of the arm of the first seat arm 11, and the insertion direction of the reducing sleeve 40 on the second seat arm 21 is consistent with the linear displacement direction of the second seat 20. That is to say, the insertion directions of the abutment sleeve 30 and the reducing sleeve 40 are perpendicular to each other. The different insertion directions of the two can effectively avoid the safety accident caused by the imbalance of force during the extrusion operation of the connecting sleeve, which would lead to the abutment sleeve 30 and the reducing sleeve 40, i.e., the internal components, coming out of the seat, thus ensuring construction safety.

[0031] To further improve the convenience of on-site construction, in this embodiment, the first support arm 11 is provided with a first U-shaped notch 111 and the second support arm 21 is provided with a second U-shaped notch 211. The openings of the first U-shaped notch 111 and the second U-shaped notch 211 point in the same direction, so that the reinforcing bar B can be inserted through the notches of the first U-shaped notch 111 and the second U-shaped notch 211 respectively, simplifying the operation.

[0032] The opening of the first U-shaped notch 111 is perpendicular to the linear displacement direction of the seat body, and the opening of the first U-shaped notch 111 is aligned with the arm length direction of the first seat body arm 11. (See attached image) Figure 2 As shown, a limiting groove 112 is provided on the inner wall of the notch of the first U-shaped notch 111. The depth direction of the limiting groove 112 is consistent with the extension direction of the notch of the first U-shaped notch 111, and the opening of the limiting groove 112 extends to the edge end face of the first U-shaped notch 111. (See attached image) Figure 1 , 2 As shown, the abutment sleeve 30 can be inserted from the edge end face of the first U-shaped notch 111.

[0033] The opening of the second U-shaped notch 211 points perpendicular to the linear displacement direction of the seat body and is consistent with the arm length direction of the second seat body arm 21. (See attached image) Figure 2 As shown, the platform 213 has a U-shaped surface with a tapered inner edge. This increases the platform area near the end of the second seat arm 21, thereby increasing the mating area between the reduced-diameter sleeve 40 and the end of the second seat arm 21. This compensates for the reduced-diameter sleeve 40's lack of support at the second U-shaped notch 211, ensuring effective force transmission between the reduced-diameter sleeve 40 and the second seat arm 21. The end edge of the platform 213 intersects with the limiting wall 214. The limiting wall 214 and the edge of the second U-shaped notch 211 are spaced apart, and the spaced arrangement of the limiting wall 214 and the edge of the second U-shaped notch 211 forms the wall thickness between the outer end face of the cavity 212 and the outer end face of the second seat arm 21. The reducing sleeve 40 extends through the notch between the two limiting walls 214 to the edge of the second U-shaped notch 211. The wall surface of the limiting wall 214 is parallel to the end face of the arm of the second U-shaped notch 211. Operators can easily install and remove the reducing sleeve 40 by holding the protrusion.

[0034] In this embodiment, the abutment sleeve 30 and the reducing sleeve 40 are construction components and do not need to be fixedly connected to the connecting sleeve A or the reinforcing bar B. They need to be removed after the extrusion operation of the connecting sleeve A is completed. In order to facilitate the installation and separation of the abutment sleeve 30 and the reducing sleeve 40 from the workpiece to be processed, the abutment sleeve 30 and the reducing sleeve 40 in this embodiment are of a split structure.

[0035] Specifically, the abutment sleeve 30 is formed by an inner abutment half 30a and an outer abutment half 30b. The tubular component is cut along the tube axis through the core plane to obtain the inner abutment half 30a, allowing it to rotate within the limiting groove 112. During assembly, it can reliably support and adjust the installation position of the reinforcing bar B. The half-body dividing surfaces of the inner abutment half 30a and the outer abutment half 30b are perpendicular to the guide surface 32, resulting in a more even axial force distribution between the two halves. Similarly, the reducing sleeve 40 is formed by a reducing diameter inner half 40a and a reducing diameter outer half 40b. The half-body dividing surfaces of the reducing diameter inner half 40a and the reducing diameter outer half 40b pass through their core and are perpendicular to the arm length direction of the second seat arm 21.

[0036] The guide surface 32 of the abutting sleeve 30 is arranged at the abutting sleeve protruding ring 31 of the abutting outer half 30b, so that the abutting outer half 30b can limit the rotation of the abutting inner half 30a after being inserted and arranged in the limiting groove 112, thereby realizing the positioning of the inner steel bar B. In order to avoid the abutting outer half 30b from being separated from the limiting groove 112 during work, the abutting outer half 30b should be tightly matched with the limiting groove 112. The protruding size of the abutting sleeve protruding ring 31 of the abutting outer half 30b in the extension direction of the guide surface 32 is greater than the protruding size of the abutting sleeve protruding ring 31 of the abutting inner half 30a, so that the protruding size of the abutting sleeve protruding ring 31 of the abutting outer half 30b in the extension direction of the guide surface 32 can be increased, thereby increasing the matching area of the abutting outer half 30a and the first seat body arm part 11, compensating for the stress concentration caused by the reduction of the matching area of the two parts due to the partial abutting sleeve protruding ring 31 of the abutting outer half 30b being located in the first U-shaped notch part 111, and ensuring the reliability of force transmission and the stability of the structure.

[0037] The diameter-reducing sleeve 40 is different from the abutting sleeve 30, and needs to be first enclosed by the diameter-reducing inner half 40a and the diameter-reducing outer half 40b between the first seat body arm part 11 and the second seat body arm part 21, and then embedded and inserted into the recess cavity 212 in the posture of the two halves. The small-diameter end of the tapered tube cavity 41 of the diameter-reducing sleeve 40 extends axially away from the first seat body 10 side to form a straight tube cavity 42, which can further shape and maintain the deformed state of the connecting sleeve A in use.

Claims

1. An assembly for connecting a reinforcing bar to a coupling sleeve, characterised in that: The application relates to a first seat body (10) and a second seat body (20) which are arranged to move linearly towards or away from each other, a first seat body arm (11) on the first seat body (10) is provided with a abutting sleeve (30) extending towards the side where the second seat body (20) is arranged, a second seat body arm (21) of the second seat body (20) is provided with a diameter-reducing sleeve (40), the abutting sleeve (30) and the diameter-reducing sleeve (40) are arranged concentrically and the shafts of the two sleeves are parallel to the linear displacement direction of the first seat body (10) and the second seat body (20), the inner tube cavity of the diameter-reducing sleeve (40) comprises a tapered tube cavity (41) arranged adjacent to the first seat body (10), the large-diameter end of the tapered tube cavity (41) is arranged adjacent to the first seat body (10), and the minimum inner diameter of the tapered tube cavity (41) is greater than or equal to the outer diameter of the abutting sleeve (30).

2. The assembly device of claim 1, wherein: The sleeve body axial dimension of the abutting sleeve (30) arranged outside the first seat body arm (11) is greater than the axial dimension of the tapered tube cavity (41); The wall thickness of the abutting sleeve (30) is smaller than the wall thickness of the tapered tube cavity (41) of the diameter-reducing sleeve, and the overhanging arm end of the second seat body arm (21) is located outside the overhanging arm end of the first seat body arm (11).

3. The assembly device of claim 1, wherein: The abutting sleeve (30) is provided with an external abutting sleeve protruding ring (31) at the end away from the second seat body (20), the abutting sleeve protruding ring (31) and the first seat body arm (11) form a detachable embedded fitting, and the abutting sleeve protruding ring (31) embedded in the first seat body arm (11) forms a limiting fitting with the first seat body arm (11) in the linear displacement direction of the seat body.

4. The assembly device of claim 3, wherein: The first seat body arm (11) is provided with a limiting groove (112), the groove depth direction and the slot opening of the limiting groove (112) are perpendicular to the linear displacement direction of the seat body, the cross-sectional shape of the abutting sleeve protruding ring (31) is consistent with the cross-sectional shape of the groove cavity of the limiting groove (112), the limiting groove (112) comprises an external guide section (112a) and an internal positioning section (112b), the guide section (112a) is a straight groove, the positioning section (112b) is an arc-shaped groove, and the guide section (112a) and the positioning section (112b) form a U-shaped limiting groove (112) in the whole slot length; the outer circumferential surface of the abutting sleeve protruding ring (31) comprises two parallel and opposite guide surfaces (32), the guide surfaces (32) are displaced and inserted into or exited from the limiting groove (112) under the guidance of the guide section (112a), and the groove depth of the positioning section (112b) is smaller than or equal to the protruding dimension of the abutting sleeve protruding ring (31).

5. The assembly device of claim 4, wherein: The arm end of the first seat body arm (11) is provided with a first U-shaped notch part (111), the opening of the first U-shaped notch part (111) is perpendicular to the linear displacement direction of the seat body, and the opening direction of the first U-shaped notch part (111) is consistent with the arm length direction of the first seat body arm (11); the limiting groove (112) is arranged at the notch inner wall of the first U-shaped notch part (111), the groove depth direction of the limiting groove (112) is consistent with the notch extension direction of the first U-shaped notch part (111), and the slot opening of the limiting groove (112) extends to the port end surface of the first U-shaped notch part (111). The abutting sleeve (30) is composed of an abutting inner half (30a) and an abutting outer half (30b). The abutting inner half (30a) is obtained by cutting a tubular part along a tube core plane in the direction of the tube axis. The half-part dividing surface of the abutting inner half (30a) and the abutting outer half (30b) is perpendicular to the guide surface (32). The guide surface (32) is arranged at the abutting sleeve protruding ring (31) of the abutting outer half (30b). The protruding size of the abutting sleeve protruding ring (31) of the abutting outer half (30b) in the extension direction of the guide surface (32) is greater than the protruding size of the abutting sleeve protruding ring (31) of the abutting inner half (30a).

6. The assembly apparatus of claim 4, wherein: The limiting groove (112) is arranged adjacent to the second seat body (20); The abutting sleeve protruding ring (31) and the first seat body arm portion (11) have a mating surface in the direction perpendicular to the linear displacement direction of the seat body. The mating surface is symmetrically arranged relative to the central surface of the first seat body arm portion (11) in the width direction. The abutting sleeve (30) is connected to the outer periphery surface of the sleeve body in a transition manner through an outer small and inner large taper surface adjacent to the end surface of the second seat body (20).

7. The assembly device according to any one of claims 1-6, characterized in that: The reduced diameter sleeve (40) and the second seat body arm portion (21) constitute a detachable embedded fitting in the linear displacement direction of the seat body. When the reduced diameter sleeve (40) is embedded in the second seat body arm portion (21), the displacement of the reduced diameter sleeve (40) away from the first seat body (10) and perpendicular to the linear displacement direction of the seat body is limited by the second seat body arm portion (21).

8. The assembly apparatus of claim 7, wherein: The second seat body arm portion (21) is recessed inward adjacent to the wall surface of the first seat body (10) to form a recessed cavity (212). The cavity wall of the recessed cavity (212) is consistent with the outer contour of the reduced diameter sleeve (40). The recessed depth of the recessed cavity (212) is less than or equal to the axial size of the reduced diameter sleeve (40). The recessed cavity (212) has a sunken platform (213) facing the first seat body (10). The sunken platform (213) limits the displacement of the reduced diameter sleeve (40) in the recessed direction of the recessed cavity (212). The cavity wall of the recessed cavity (212) adjacent to the connecting end of the second seat body arm portion (21) is a limiting wall (214) facing the second seat body arm portion (21). The limiting wall (214) limits the displacement of the reduced diameter sleeve (40) away from the connecting end of the second seat body arm portion (21).

9. The assembly apparatus of claim 8, wherein: The arm end of the second seat body arm portion (21) is provided with a second U-shaped notch portion (211). The opening of the second U-shaped notch portion (211) points to the direction perpendicular to the linear displacement direction of the seat body, which is consistent with the arm length direction of the second seat body arm portion (21). The openings of the first U-shaped notch portion (111) and the second U-shaped notch portion (211) point to the same direction. The sunken platform (213) is in a U shape as a whole. The inner edge of the sunken platform (213) is in a closed shape. The end portion of the sunken platform (213) is spaced apart from the limiting wall (214) and the opening end surface of the second U-shaped notch portion (211). The sleeve body of the reduced diameter sleeve (40) extends to the opening end surface of the second U-shaped notch portion (211) through the gap between the two limiting walls (214). The wall surface of the limiting wall (214) is parallel to the arm end surface of the second U-shaped notch portion (211).

10. The assembly apparatus of claim 9, wherein: The small-diameter end of the conical tube cavity (41) in the reduced-diameter sleeve (40) extends axially away from the first seat body (10) side to form a straight tube cavity (42); the reduced-diameter sleeve (40) is composed of a reduced-diameter inner half (40a) and a reduced-diameter outer half (40b); the half-part dividing surface of the reduced-diameter inner half (40a) and the reduced-diameter outer half (40b) passes through the tube core and is perpendicular to the arm length direction of the second seat body arm (21).

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