Press fitting device for nut type structures

Abstract

The utility model relates to a nut type structure press-fitting device which comprises a press-fitting assembly and a locating piece, the press-fitting assembly comprises a supporting frame, a first pressing head, a second pressing head, an ejector rod assembly and a driving device, the second pressing head is arranged in the first pressing head in an up-and-down moving mode, and the ejector rod assembly is arranged in the first pressing head in an up-and-down moving mode and located above the second pressing head. The driving device is connected with the ejector rod assembly and can drive the ejector rod assembly to move up and down, and in the process that the driving device drives the ejector rod assembly to move downwards, the driving device can drive the first pressing head to move downwards through the linkage assembly and can drive the second pressing head to move downwards through the connecting assembly. And after the first pressing head moves to the preset position and the second pressing head moves to the preset position, the ejector rod assembly can be driven to continue to move downwards so as to push the check ring downwards. According to the nut type structure press-fitting device, a check ring can be more conveniently pressed into a guide nut of a brake cylinder or a clamping groove of a gap adjuster, labor intensity is lower, and installation efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the application field of railway locomotive vehicle foundation brake, in particular to a nut type structure press-fitting device. Background Art

[0002] At present, there are about 3,500 EMUs in stock. In recent years, the output of new EMUs has been stable, and the annual growth rate of EMUs under maintenance has reached more than 20%. With the continuous development of maintenance business, the maintenance business has also been continuously expanded. At the same time, customers' requirements for the maintenance process level, quality capability, maintenance cycle, maintenance cost, and maintenance data of brake caliper units have also been continuously improved. At present, the assembly process of brake caliper units has problems such as low degree of automation, low precision, high labor intensity, and low installation efficiency.

[0003] The assembly of the brake cylinder includes two parts: pre-assembly and final assembly. The pre-assembly includes the cylinder body, piston, clearance adjuster, connecting rod, parking cylinder, hand release, etc. The final assembly assembles the pre-assembled parts in sequence to form the brake cylinder. During pre-assembly, the retaining ring needs to be pressed into the slots of the guide nut and the clearance adjuster. In the prior art, when installing the retaining ring, a press is used to press the spring seat to expose the slot, and then the retaining ring is manually installed, which is time-consuming and labor-intensive, with high labor intensity and low installation efficiency. Utility Model Content

[0004] The utility model aims to provide a nut-type structure press-fitting device, which can more conveniently press-fit a retaining ring into a guide nut of a brake cylinder or a slot of a clearance adjuster, with lower labor intensity and higher installation efficiency.

[0005] The purpose of the utility model is achieved in this way. A nut-type structure pressing device includes a pressing assembly and a positioning member. The pressing assembly includes a support frame, a cylindrical first pressing head, a second pressing head, a push rod assembly and a driving device; the first pressing head and the positioning member are arranged on the support frame at an upper and lower interval, the positioning member is used to center and position the guide nut component of the brake cylinder or the clearance adjuster, the second pressing head can be moved up and down and is arranged in the first pressing head and can be used to cover the retaining ring of the brake cylinder, the push rod assembly can be moved up and down and is arranged in the first pressing head and is located above the second pressing head, and the first pressing head, the second pressing head, the push rod assembly and the positioning member are coaxially arranged; the driving device is connected to the push rod assembly and can drive the push rod assembly to move up and down. In the process of driving the push rod assembly to move downward, the driving device can drive the first pressing head to move downward together through the linkage assembly, and can drive the second pressing head to move downward together through the connecting assembly, and can also drive the push rod assembly to continue to move downward after the first pressing head moves to a preset position and the second pressing head moves to the preset position, so as to push the retaining ring downward.

[0006] In a preferred embodiment of the utility model, the linkage assembly includes a pressure plate and a buffer spring, and the upper end of the first pressure head is fixed to the bottom surface of the pressure plate; the driving end of the driving device is fixed to the push rod assembly through a connecting rod, and the connecting rod can move up and down through the pressure plate. The buffer spring is sleeved on the connecting rod and its two ends are respectively pressed between the limiting portion of the connecting rod and the top surface of the pressure plate.

[0007] In a preferred embodiment of the present invention, a first linear bearing is fixedly disposed at the center hole of the pressure plate, and the connecting rod is disposed in the first linear bearing so as to be movable up and down.

[0008] In a preferred embodiment of the present invention, the support frame is provided with a vertically arranged guide column, and both ends of the pressing plate are sleeved on the guide column so as to be able to move up and down.

[0009] In a preferred embodiment of the present invention, an annular groove is provided on the outer periphery of the central hole of the pressure plate, and the lower end of the buffer spring abuts against the bottom of the groove.

[0010] In a preferred embodiment of the present invention, the connecting assembly includes a guide plate, a vertical rod and a cross rod. A side through hole is opened on the side wall of the first pressure head, and the guide plate passes through the side through hole and is fixedly connected to the connecting rod; the vertical rod is located on the outer side of the first pressure head, and the upper part of the vertical rod can be slid up and down in the guide plate, and a return spring is also sleeved on the vertical rod, and the two ends of the return spring respectively press against the guide plate and the bottom step of the vertical rod; the lower end of the vertical rod is fixedly connected to one end of the cross rod, and the other end of the cross rod passes through the side through hole and is fixedly connected to the second pressure head, and the cross rod can press against the bottom hole wall of the side through hole.

[0011] In a preferred embodiment of the present invention, a mounting hole is provided on the guide plate, a second linear bearing is fixedly disposed in the mounting hole, and the vertical rod is slidably disposed in the second linear bearing.

[0012] In a preferred embodiment of the present invention, the push rod assembly includes a fixed block fixed to the bottom end of the connecting rod and a plurality of vertical push rods fixedly arranged on the bottom surface of the fixed block at circumferential intervals.

[0013] In a preferred embodiment of the present invention, the positioning member includes a positioning column, and the inner hole of the guide nut in the guide nut assembly can be sleeved on the positioning column; or, the positioning member includes a sleeve with a groove on the top for inserting and placing the gap adjuster.

[0014] In a preferred embodiment of the utility model, the second pressure head includes a conical block and a cylindrical block connected up and down, the outer wall of the conical block is used to fit the retaining ring, the cylindrical block can be inserted into the inner hole of the guide nut or the upper inner hole of the clearance adjuster, and the bottom surface of the conical block can be against the top surface of the guide nut or the clearance adjuster.

[0015] As described above, the nut-type structure press-fitting device of the utility model is suitable for existing brake caliper unit products of railway locomotives and vehicles, and can be used for press-fitting the retaining ring on the guide nut and the retaining ring on the clearance adjuster. Through the cooperation of the driving device, the first pressure head, the second pressure head and the push rod assembly, the retaining ring can be pressed in one step, without the need for manual installation of the retaining ring to the card slot, the labor intensity is lower, and the alignment of the guide nut (clearance adjuster) and the retaining ring can be ensured, and the installation efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0017] Figure 1 : It is a schematic diagram of the nut-type structure press-fitting device provided by the utility model.

[0018] Figure 2 : It is a cross-sectional view of the nut-type structure press-fitting device provided by the utility model.

[0019] Figure 3 :for Figure 2 A partial enlarged view of the middle part of the structure.

[0020] Figure 4 : A partial cross-sectional view of the guide nut provided by the utility model.

[0021] Figure 5 : A front view of the guide nut assembly provided by the utility model after being installed in a nut-type structure press-fitting device.

[0022] Figure 6 : Another cross-sectional view of the nut-type structure press-fitting device provided by the utility model.

[0023] Figure 7 : A three-dimensional diagram of the nut-type structure press-fitting device provided by the utility model after the gap adjuster is installed.

[0024] Figure 8 : It is a front view of the nut structure press-fitting device provided by the utility model after the gap adjuster is installed.

[0025] Description of Figure Numbers:

[0026] 1. Support frame; 11. Guide column;

[0027] 2. The first pressure head;

[0028] 3. Second pressure head; 31. Conical block; 32. Cylindrical block;

[0029] 4. Mandrel assembly; 41. Fixing block; 42. Vertical mandrel;

[0030] 5. linkage assembly; 51. pressure plate; 52. buffer spring; 53. first linear bearing;

[0031] 6. Connecting assembly; 61. Guide plate; 62. Vertical rod; 621. Bottom step; 63. Crossbar; 64. Return spring; 65. Second linear bearing;

[0032] 7. driving device; 71. connecting rod; 72. limiting part;

[0033] 8. Positioning piece; 81. Positioning column;

[0034] 91. Guide nut composition; 911. Guide nut; 912. Guide tooth seat; 913. Spring seat; 914. Guide spring; 915. Retaining ring;

[0035] 92. Clearance adjuster. DETAILED DESCRIPTION

[0036] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0037] like Figures 1 to 8 As shown, this embodiment provides a nut-type structure pressing device, including a pressing assembly and a positioning member 8, the pressing assembly including a support frame 1, a cylindrical first pressing head 2, a second pressing head 3, a push rod assembly 4 and a driving device 7; the first pressing head 2 and the positioning member 8 are arranged on the support frame 1 with an upper and lower interval, the positioning member 8 is used to center and position the guide nut component 91 or the clearance adjuster 92 of the brake cylinder, the second pressing head 3 is arranged in the first pressing head 2 and can be used to set the retaining ring 915 of the brake cylinder, the push rod assembly 4 is arranged in the first pressing head 2 and can be moved up and down and is located above the second pressing head 3, and the first pressing head 2, the second pressing head 3, the push rod assembly 4 and the positioning member 8 are coaxially arranged.

[0038] The driving device 7 is connected to the push rod assembly 4 and can drive the push rod assembly 4 to move up and down. In the process of driving the push rod assembly 4 to move downward, the driving device 7 can drive the first pressure head 2 to move downward through the linkage assembly 5, and can drive the second pressure head 3 to move downward through the connecting assembly 6. It can also drive the push rod assembly 4 to continue to move downward after the first pressure head 2 moves to the preset position and the second pressure head 3 moves to the preset position, so as to push the retaining ring 915 downward.

[0039] The above-mentioned nut-type structure press-fitting device is mainly used to press-fit the retaining ring 915 into the slot of the nut-type structure. The nut-type structure here mainly refers to the guide nut component 91 of the brake cylinder and the gap adjuster 92. For example, the press-fitting device can be used to press-fit the retaining ring 915 into the slot of the guide nut 911, or press-fit the retaining ring 915 into the slot of the gap adjuster 92. During press-fitting, the nut-type structure is installed on the positioning member 8, the retaining ring 915 is sleeved on the second pressure head 3, and the driving device 7 drives the push rod assembly 4 to move downward, driving the first pressure head 2 and the second pressure head 3 to move downward together; when the first pressure head 2 moves to the preset position, the slot on the nut-type structure is exposed, and the first pressure head 2 no longer moves. After the second pressure head 3 moves to the preset position, the second pressure head 3 no longer moves. The driving device 7 drives the push rod assembly 4 to continue to move downward, and the push rod assembly 4 pushes the retaining ring 915 downward, and expands the retaining ring 915 and pushes it into the slot to complete the press-fitting.

[0040] Therefore, the nut-type structure press-fitting device in this embodiment is suitable for existing brake caliper unit products of railway locomotives and vehicles, and can be used for press-fitting the retaining ring 915 on the guide nut 911 and the retaining ring 915 on the gap adjuster 92. Through the cooperation of the driving device 7, the first pressing head 2, the second pressing head 3 and the push rod assembly 4, the retaining ring 915 can be press-fitted in one step, without the need for manual installation of the retaining ring 915 to the card slot, with lower labor intensity, and can ensure the alignment of the guide nut 911 (gap adjuster 92) and the retaining ring 915, and the installation efficiency is higher.

[0041] In a specific implementation, in order to facilitate the downward movement of the push rod assembly 4 and the first pressure head 2, Figure 3 The linkage assembly 5 includes a pressure plate 51 and a buffer spring 52. The upper end of the first pressure head 2 is fixed to the bottom surface of the pressure plate 51. The driving end of the driving device 7 is fixed to the push rod assembly 4 through the connecting rod 71. The connecting rod 71 can move up and down through the pressure plate 51. The buffer spring 52 is sleeved on the connecting rod 71 and its two ends are respectively pressed between the limiting portion 72 of the connecting rod 71 and the top surface of the pressure plate 51.

[0042] A first linear bearing 53 is fixedly provided at the center hole of the pressing plate 51, and the connecting rod 71 is provided in the first linear bearing 53 so as to be movable up and down, so as to guide and protect the movement of the connecting rod 71. The bottom of the first linear bearing 53 has a mounting ring with an increased diameter, which rests on the bottom surface of the pressing plate 51 and is connected to the pressing plate 51 by fasteners (such as bolts).

[0043] In order to facilitate the movement of the pressing plate 51, refer to Figure 1 The support frame 1 has a vertically arranged guide column 11, and both ends of the pressing plate 51 are sleeved on the guide column 11 so as to be movable up and down.

[0044] In order to facilitate the limiting of the buffer spring 52 , an annular groove is provided on the outer periphery of the central hole of the pressure plate 51 , and the lower end of the buffer spring 52 abuts against the bottom of the groove.

[0045] Further, in order to facilitate the push rod assembly 4 to drive the second pressure head 3 to move together when it moves downward, and to enable the push rod assembly 4 to move relative to the second pressure head 3 after the second pressure head 3 moves to a preset position, refer to Figure 3 The connecting assembly 6 includes a guide plate 61, a vertical rod 62 and a cross rod 63. A side through hole is opened on the side wall of the first pressure head 2. The guide plate 61 passes through the side through hole and is fixedly connected to the connecting rod 71; the vertical rod 62 is located on the outer side of the first pressure head 2, and the upper part of the vertical rod 62 can slide up and down and pass through the guide plate 61. A return spring 64 is also sleeved on the vertical rod 62, and the two ends of the return spring 64 are respectively pressed between the guide plate 61 and the bottom step 621 of the vertical rod 62; the lower end of the vertical rod 62 is fixedly connected to one end of the cross rod 63, and the other end of the cross rod 63 passes through the side through hole and is fixedly connected to the second pressure head 3, and the cross rod 63 can be pressed against the bottom hole wall of the side through hole.

[0046] In order to prevent the guide plate 61 and the vertical rod 62 from wearing too fast, a mounting hole is provided on the guide plate 61, and a second linear bearing 65 is fixedly installed at the mounting hole. The vertical rod 62 can slide up and down in the second linear bearing 65, so that the second linear bearing 65 can play a guiding and protective role when the vertical rod 62 and the guide plate 61 move relative to each other. The bottom of the second linear bearing 65 has a mounting ring with an increased diameter, which rests on the bottom surface of the guide plate 61 and is connected to the guide plate 61 by fasteners (such as bolts). The upper end of the above-mentioned reset spring 64 specifically rests on the bottom surface of the second linear bearing 65.

[0047] In order to facilitate the push rod assembly 4 to push the retaining ring 915, refer to Figure 3 The push rod assembly 4 includes a fixed block 41 fixed to the bottom end of the connecting rod 71 and a plurality of vertical push rods 42 fixed to the bottom surface of the fixed block 41 at circumferential intervals.

[0048] The structure of the guide nut 91 is an existing structure. On the one hand, it is used to cooperate with the lead screw of the brake cylinder to transmit the braking force; on the other hand, it is used to cooperate with the lead screw to adjust the gap between the clamp and the wheel when the vehicle is braked. The brake cylinder mentioned in this article is an air brake. Figure 4The guide nut component 91 includes a hollow guide nut 911, a guide tooth seat 912 sleeved and fixed on the middle part of the guide nut 911, an annular spring seat 913 sleeved on the end of the guide nut 911, and a guide spring 914 is arranged on the outer sleeve of the guide nut 911, and the two ends of the guide spring 914 are respectively pressed against the guide tooth seat 912 and the spring seat 913; an annular groove is opened on the outer wall of the end of the guide nut 911, and a retaining ring 915 can be clamped in the groove; the retaining ring 915 is an open ring, which is a metal retaining ring 915, and is used to axially limit the spring seat 913.

[0049] In order to facilitate positioning of the guide nut assembly 91, the positioning member 8 includes a positioning column 81, and the inner hole of the guide nut 911 in the guide nut assembly 91 can be sleeved on the positioning column 81. The outer diameter of the positioning column 81 matches the inner hole diameter of the guide nut 911 to achieve centering of the guide nut assembly 91.

[0050] The clearance adjuster 92 is an existing structure, and its function is the same as that of the above-mentioned guide nut assembly 91. On the one hand, it is used to cooperate with the lead screw of the brake cylinder to transmit the braking force; on the other hand, it is used to cooperate with the lead screw to adjust the clearance between the caliper and the wheel when the vehicle is braked. The structure of the upper part of the clearance adjuster 92 is the same as that of the upper part of the above-mentioned guide nut assembly 91. The upper part has a hollow central tube (corresponding to the upper part of the guide nut 911), a spring seat 913 and a spring are sleeved on the central tube, and a groove is opened on the outer wall of the end of the central tube for installing a retaining ring 915 to axially limit the spring seat 913.

[0051] In order to facilitate the positioning of the gap adjuster 92, refer to Figure 6 The positioning member 8 includes a sleeve with a groove on the top for inserting and placing the gap adjuster 92.

[0052] The lower part of the gap adjuster 92 is different from the above-mentioned guide nut assembly 91. The lower part of the above-mentioned guide nut assembly 91 is a hollow structure, while the lower part of the gap adjuster 92 is a shaft structure without an inner hole. Therefore, the positioning member 8 adopts a sleeve structure with a groove on the top, and when in use, the lower part of the gap adjuster 92 can be directly inserted into the groove.

[0053] Further, in order to ensure the alignment of the retaining ring 915 and the nut structure (i.e., the guide nut component 91 or the gap adjuster 92) and to facilitate the sleeve installation of the retaining ring 915, refer to Figure 3 The second pressure head 3 includes a conical block 31 and a cylindrical block 32 connected up and down. The outer wall of the conical block 31 is used to fit the retaining ring 915. The cylindrical block 32 can be inserted into the inner hole of the guide nut 911 or the upper inner hole of the gap adjuster 92, and the bottom surface of the conical block 31 can rest on the top surface of the guide nut 911 or the gap adjuster 92.

[0054] Since the retaining ring 915 is relatively hard, it is relatively laborious for the operator to manually expand it. In this embodiment, the diameter of the small diameter end of the conical block 31 should match the inner diameter of the retaining ring 915 in the natural state, and the diameter of the large diameter end should be larger than the outer diameter of the guide nut 911 and the outer diameter of the center tube of the gap adjuster 92. The diameter corresponding to the position of the above-mentioned multiple vertical push rods 42 should be greater than or equal to the outer diameter of the large end of the conical block 31. When in use, the retaining ring 915 is directly sleeved on the small diameter end of the conical block 31. When the second pressure head 3 moves to the preset position and the vertical push rods 42 continue to move downward, each vertical push rod 42 can abut against the end face of the retaining ring 915 and push the retaining ring 915 downward. During the downward pushing process, the retaining ring 915 moves downward from the small diameter end to the large diameter end of the conical block 31 and is continuously expanded. Then the retaining ring 915 is separated from the conical block 31 and pushed into the slot of the guide nut 911 or the slot of the gap adjuster 92.

[0055] By arranging the second pressing head 3 and the positioning member 8 coaxially up and down, using the positioning member 8 to center and position the nut-like structure, using the middle conical block 31 of the second pressing head 3 to set the retaining ring 915, it is ensured that the retaining ring 915 and the second pressing head 3 are aligned, and the cylindrical block 32 of the second pressing head 3 can be inserted into the upper inner hole of the nut-like structure to further ensure the alignment of the second pressing head 3 and the nut-like structure, thereby effectively ensuring the alignment of the guide nut 911 and the retaining ring 915, as well as the alignment of the center tube of the clearance adjuster 92 and the retaining ring 915.

[0056] The driving device 7 can be, for example, a cylinder, the piston rod of which is vertically arranged and the bottom end of which is fixedly connected to the connecting rod 71 to drive the push rod assembly 4 to move up and down. A switch is also provided on the support frame 1, and the switch is used to control the action of the cylinder. The switch can be, for example, a hand valve, and the operator can manually operate the hand valve to control the cylinder to move up or down.

[0057] When the nut-type structure press-fit device is in the initial position, that is, Figure 2 and Figure 3 In the state shown, the buffer spring 52 and the return spring 64 are both in a slightly compressed state, and the bottom surface of the first linear bearing 53 abuts against the top surface of the guide plate 61; the return spring 64 is also in a slightly compressed state, and the cross bar 63 abuts against the bottom hole wall of the side through hole of the first pressure head 2 under the elastic force of the return spring 64.

[0058] Taking the guide nut assembly 91 as an example, the retaining ring 915 is press-fitted into the slot of the guide nut 911 using the nut-type structure press-fitting device. The press-fitting process is as follows:

[0059] Sleeve the guide nut assembly 91 onto the positioning column 81, and sleeve the retaining ring 915 onto the small diameter end of the conical block 31 of the second ram 3 (according to needs, the retaining ring 915 can also be installed after the second ram 3 moves to a preset position); use the driving device 7 to drive the connecting rod 71 to move downward, and drive the push rod assembly 4 to move downward together; due to the existence of the linkage assembly 5, the pressure plate 51 and the first ram 2 will be moved downward together; at the same time, due to the existence of the connecting assembly 6, the second ram 3 will also move downward together.

[0060] When the first ram 2 contacts the spring seat 913 of the guide nut 911, it will continue to move downward, and will drive the spring seat 913 to move downward together; when the first ram 2 moves to the preset position, that is, when the slot is exposed, the first ram 2 will no longer move, and the pressure plate 51 will no longer move; if the second ram 3 also moves to the preset position at this time (that is, the cylindrical block 32 of the second ram 3 is inserted into the inner hole of the guide nut 911 and the bottom surface of the conical block 31 is against the top surface of the guide nut 911), the second ram 3 will no longer move. When the first ram 2 moves to the preset position, if the second ram 3 has not moved to the preset position at this time, since the second ram 3 can move up and down relative to the first ram 2, the second ram 3 will move to the preset position under the action of the elastic force of the connecting rod 71 and the return spring 64, and the second ram 3 will no longer move.

[0061] Afterwards, the connecting rod 71 drives the push rod assembly 4 to continue to move downward, compresses the buffer spring 52, and drives the guide plate 61 to move downward together. The guide plate 61 moves downward relative to the vertical rod 62 and compresses the reset spring 64, and the guide plate 61 moves downward relative to the first linear bearing 53, and the first linear bearing 53 is separated from the guide plate 61; the multiple vertical push rods 42 of the push rod assembly 4 push the retaining ring 915 downward, expand the retaining ring 915, and then push it into the slot to complete the press-fitting process.

[0062] Afterwards, the driving device 7 drives the connecting rod 71 to move upward, driving the push rod assembly 4 and the guide plate 61 to move upward together. When the guide plate 61 moves up to rest against the first linear bearing 53, the buffer spring 52 and the second return spring 64 are both restored to their initial state. Then, the connecting rod 71 will drive the first pressure head 2 and the second pressure head 3 to move upward as a whole until they return to their initial position.

[0063] The retaining ring 915 is press-fitted into the slot of the clearance adjuster 92 using the press-fitting device. The press-fitting process is similar to the above-mentioned press-fitting of the retaining ring 915 into the slot of the guide nut 911 , and will not be described in detail here.

[0064] The above is only an illustrative embodiment of the utility model, and is not intended to limit the scope of the utility model. Any equivalent changes and modifications made by any technician in the field without departing from the concept and principle of the utility model should fall within the scope of protection of the utility model.

Claims

1. A nut-type structure press-fitting device, characterized in that: It includes a press-fitting assembly and a positioning member, wherein the press-fitting assembly includes a support frame, a cylindrical first pressing head, a second pressing head, a push rod assembly and a driving device; The first pressure head and the positioning member are arranged on the support frame with an interval up and down, the positioning member is used to center and position the guide nut component or the clearance adjuster of the brake cylinder, the second pressure head is arranged in the first pressure head and can be used to cover the retaining ring of the brake cylinder, the push rod assembly is arranged in the first pressure head and is located above the second pressure head, and the first pressure head, the second pressure head, the push rod assembly and the positioning member are coaxially arranged; The driving device is connected to the push rod assembly and can drive the push rod assembly to move up and down. In the process of driving the push rod assembly to move downward, the driving device can drive the first pressure head to move downward through the linkage assembly, and can drive the second pressure head to move downward through the connecting assembly. It can also drive the push rod assembly to continue to move downward after the first pressure head moves to a preset position and the second pressure head moves to a preset position, so as to push the retaining ring downward.

2. The nut-type structure press-fitting device according to claim 1, characterized in that: The linkage assembly includes a pressure plate and a buffer spring. The upper end of the first pressure head is fixed to the bottom surface of the pressure plate. The driving end of the driving device is fixed to the push rod assembly through a connecting rod. The connecting rod can move up and down through the pressure plate. The buffer spring is sleeved on the connecting rod and its two ends are respectively pressed between the limiting portion of the connecting rod and the top surface of the pressure plate.

3. The nut-type structure press-fitting device according to claim 2, characterized in that: A first linear bearing is fixedly arranged at the center hole of the pressing plate, and the connecting rod is arranged to be movable up and down in the first linear bearing.

4. The nut-type structure press-fitting device according to claim 2, characterized in that: The support frame is provided with a vertically arranged guide column, and the two ends of the pressing plate are sleeved on the guide column so as to be able to move up and down.

5. The nut-type structure press-fitting device according to claim 2, characterized in that: An annular groove is arranged on the outer periphery of the central hole of the pressure plate, and the lower end of the buffer spring abuts against the groove bottom of the groove.

6. The nut-type structure press-fitting device according to claim 2, characterized in that: The connecting assembly includes a guide plate, a vertical rod and a cross rod. A side through hole is opened on the side wall of the first pressure head, and the guide plate passes through the side through hole and is fixedly connected to the connecting rod; the vertical rod is located on the outer side of the first pressure head, and the upper part of the vertical rod can be slid up and down in the guide plate, and a return spring is also sleeved on the vertical rod, and the two ends of the return spring respectively abut between the guide plate and the bottom step of the vertical rod; the lower end of the vertical rod is fixedly connected to one end of the cross rod, and the other end of the cross rod passes through the side through hole and is fixedly connected to the second pressure head, and the cross rod can abut against the bottom hole wall of the side through hole.

7. The nut-type structure press-fitting device according to claim 6, characterized in that: The guide plate is provided with a mounting hole, a second linear bearing is fixedly disposed at the mounting hole, and the vertical rod is slidably disposed in the second linear bearing.

8. The nut-type structure press-fitting device according to claim 2, characterized in that: The push rod assembly comprises a fixed block fixed at the bottom end of the connecting rod and a plurality of vertical push rods fixedly arranged on the bottom surface of the fixed block at circumferential intervals.

9. The nut-type structure press-fitting device according to claim 1, characterized in that: The positioning member includes a positioning column, and the inner hole of the guide nut in the guide nut assembly can be sleeved on the positioning column; or, the positioning member includes a sleeve with a groove on the top, which is used for inserting and placing the gap adjuster.

10. The nut-type structure press-fitting device according to claim 9, characterized in that: The second pressure head includes a conical block and a cylindrical block connected up and down, the outer wall of the conical block is used to fit the retaining ring, the cylindrical block can be inserted into the inner hole of the guide nut or the upper inner hole of the gap adjuster, and the bottom surface of the conical block can rest on the top surface of the guide nut or the gap adjuster.

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