Combined bolt press-fitting machine

By designing a synchronous pressing module and a feeding module, the efficient pressing of multiple bolts on the cylinder cover was achieved, solving the problem of low efficiency in existing technologies and improving the efficiency of automated production lines.

CN122058149APending Publication Date: 2026-05-19ANHUI JINRUI AUTO PARTS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ANHUI JINRUI AUTO PARTS CO LTD
Filing Date
2025-12-31
Publication Date
2026-05-19

AI Technical Summary

Technical Problem

Existing combination bolt press-fitting machines are inefficient when handling multiple bolts for cylinder cover press-fitting, making it difficult to achieve efficient press-fitting operations.

Method used

Design a combined bolt pressing machine, which uses a first pressing module and a second pressing module to simultaneously press the bolts on both sides of the cylinder cover. The main drive mechanism and horizontal slide rail are used to realize the linear arrangement and synchronous movement of multiple bolts. Short bolt and long bolt feeding modules are used to achieve efficient supply. Electromagnets and elastic discharge tubes are used to accurately press the bolts.

Benefits of technology

It improves bolt pressing efficiency, reduces equipment operation time, enables rapid pressing of multiple sets of bolts, simplifies equipment structural design, and improves the efficiency of automated production lines.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention provides an assembling bolt press-fitting machine which comprises a workbench, and a loading table used for moving a machined part is arranged at the top of the workbench; the press-fitting unit is suspended above the workbench; the press-fitting unit comprises a main driving mechanism, a first press-fitting module and a second press-fitting module, the first press-fitting module and the second press-fitting module slide on the main driving mechanism, the first press-fitting module is composed of a long bolt press-fitting mechanism and a short bolt press-fitting mechanism, and the second press-fitting module is composed of two long bolt press-fitting mechanisms and a short bolt press-fitting mechanism. The workbench is further provided with a first feeding module, a second feeding module, a third feeding module, a fourth feeding module and a fifth feeding module which are used for supplying bolts. According to the first press-fitting module and the second press-fitting module provided by the invention, the operation mode is alternately completed by virtue of the same group of driving structures, the complex structural design is reduced, the press-fitting time of equipment is shortened by virtue of synchronous movement batch operation, and the bolt press-fitting operation efficiency is improved.
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Description

Technical Field

[0001] This invention belongs to the field of bolt press-fitting machine technology, and particularly relates to a combination bolt press-fitting machine. Background Technology

[0002] The cylinder cover is a key sealing component installed on top of the engine block. Its enclosed structure creates a physical barrier, effectively preventing dust, moisture, and other external impurities from entering the engine. The cylinder cover has numerous bolts of varying structures; currently, automated production lines use combination bolt press-fit machines to replace manual bolt installation.

[0003] When assembling cylinder covers, combination bolt press machines mostly use a single-unit structure to perform multiple back-and-forth operations in conjunction with a feeding structure to complete tasks such as feeding, unloading, moving, and pressing. However, when dealing with the pressing of numerous bolts for cylinder covers, the single-unit pressing structure inevitably suffers from insufficient pressing efficiency, which can easily lead to low operating efficiency of the combination bolt press machine. Summary of the Invention

[0004] This invention provides a combined bolt press-fitting machine, which is implemented as follows: A combined bolt press-fitting machine includes:

[0005] A workbench, the top of which is provided with a loading platform for moving workpieces;

[0006] A press-fitting unit suspended above the worktable; the press-fitting unit includes a main drive mechanism and a first press-fitting module and a second press-fitting module sliding on the main drive mechanism, the first press-fitting module and the second press-fitting module being disposed on both sides below the main drive mechanism; the first press-fitting module and the second press-fitting module respectively press bolts of different lengths into the workpiece;

[0007] The first pressing module consists of a set of long bolt pressing mechanisms and a set of short bolt pressing mechanisms, and the second pressing module consists of two sets of long bolt pressing mechanisms and a set of short bolt pressing mechanisms;

[0008] The workbench is also equipped with a first feeding module, a second feeding module, a third feeding module, a fourth feeding module and a fifth feeding module. The first feeding module and the third feeding module supply short bolts to two sets of short bolt pressing mechanisms, while the second feeding module, the fourth feeding module and the fifth feeding module supply long bolts to three sets of long bolt pressing mechanisms.

[0009] Preferably, the main drive mechanism includes a first horizontal slide rail, a second horizontal slide rail, a third horizontal slide rail, and a fourth horizontal slide rail. The third horizontal slide rail and the fourth horizontal slide rail slide on the first horizontal slide rail and the second horizontal slide rail, respectively. The first pressing module is assembled on the third horizontal slide rail, and the second pressing module is assembled on the fourth horizontal slide rail.

[0010] Preferably, a processing area is provided below the pressing unit, the first feeding module, the second feeding module and the third feeding module are provided on one side of the processing area, the fourth feeding module and the fifth feeding module are provided on the other side of the processing area, and the second feeding module is provided between the first feeding module and the third feeding module.

[0011] Preferably, the first pressing module is designed with a set of long bolt pressing mechanisms and a set of short bolt pressing mechanisms arranged together, and the fourth feeding module supplies long bolts to the long bolt pressing mechanisms.

[0012] Preferably, the second pressing module has two sets of long bolt pressing mechanisms and short bolt pressing mechanisms arranged in an adjacent manner, with the short bolt pressing mechanisms positioned on the side of the two sets of long bolt pressing mechanisms closer to the fourth and fifth feeding modules. The second feeding module supplies long bolts to the set of long bolt pressing mechanisms in the second pressing module that is away from the short bolt pressing mechanisms, and the fifth feeding module supplies long bolts to the set of long bolt pressing mechanisms in the second pressing module that is close to the short bolt pressing mechanisms.

[0013] Preferably, the first and second horizontal slide rails are arranged parallel to each other, and the third and fourth horizontal slide rails are arranged parallel to each other and perpendicular to the first horizontal slide rail.

[0014] Preferably, the short bolt pressing mechanism includes a base assembled on a fourth horizontal slide rail, a sliding table sliding on the base, and a loading chamber. The loading chamber is provided with a first pressing rod, which pushes the short bolt in the loading chamber into the screw hole of the workpiece.

[0015] Preferably, the sliding table is provided with a loading chamber and an elastic discharge pipe and a feed pipe communicating with the interior of the loading chamber. The short bolts delivered by the pneumatic pipe enter the loading chamber through the feed pipe, and the first pressing rod pushes the short bolts into the elastic discharge pipe and presses them into the screw hole of the workpiece.

[0016] Preferably, the short bolt feeding module includes a push guide block, a first base, and a short bolt bracket for supporting the first base. The push guide block slides inside the first base, and the bottom of the first base is provided with an air supply pipe. When the push guide block pulls the short bolt to the air outlet of the air supply pipe, the short bolt is transported into the feeding pipe through the conveying pipe under the action of the air flow.

[0017] Preferably, the long bolt feeding module includes a limiting block, a long bolt bracket, and a second base. The limiting block for fixing the long bolt is disposed on the second base, which is mounted on top of the long bolt bracket. The long bolt is filled in the second base and the limiting block. The long bolt is magnetically transferred and pressed into the screw hole of the workpiece by the long bolt pressing mechanism.

[0018] Compared with the prior art, the embodiments of this application have the following main advantages:

[0019] The combined bolt pressing machine provided by this invention enables the pressing of multiple sets of bolts on the same side through a first pressing module and a second pressing module. Most of the bolts on the same side are arranged in a straight line. After the material is picked up, they only move in the same direction to complete the pressing operation, thereby reducing the overall operating time of the machine. Similarly, the second pressing module performs pressing operations on the linearly arranged screw holes on the other side of the cover. The first pressing module and the second pressing module complete the operation simultaneously, performing rapid pressing operations on the bolts on the cover structure. The multiple pressing structures reduce the complexity of the structural design by using a group drive structure, and reduce the pressing time of the equipment by using synchronous motion for batch operation, thereby improving the efficiency of bolt pressing operations. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of a combined bolt press-fitting machine provided by the present invention.

[0021] Figure 2 This is a schematic diagram of the main drive mechanism, the first pressing module, and the second pressing module of a combined bolt pressing machine provided by the present invention.

[0022] Figure 3 This is a schematic diagram of the feeding guide rail and loading platform structure of a combined bolt pressing machine provided by the present invention.

[0023] Figure 4 This is a schematic diagram of the main drive mechanism of a combined bolt press machine provided by the present invention.

[0024] Figure 5 This is a schematic diagram of the first pressing module and the second pressing module of a combined bolt pressing machine provided by the present invention.

[0025] Figure 6 This is a schematic diagram of the short bolt pressing mechanism of a combined bolt pressing machine provided by the present invention.

[0026] Figure 7 This is a schematic diagram of the first and second horizontal slide rails of a combined bolt press machine provided by the present invention.

[0027] Figure 8This is a schematic diagram of the short bolt feeding module structure of a combined bolt press-fitting machine provided by the present invention.

[0028] Figure 9 This is a schematic diagram of the long bolt feeding module structure of a combined bolt press-fitting machine provided by the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100. Workbench; 110. Feeding guide rail; 120. Loading platform; 101. First feeding module; 102. Second feeding module; 103. Third feeding module; 104. Fourth feeding module; 105. Fifth feeding module; 210. Main drive mechanism; 211. First horizontal slide rail; 212. Second horizontal slide rail; 213. Third horizontal slide rail; 214. Fourth horizontal slide rail; 220. First pressing module; 230. Second pressing module; 310. Short bolt feeding module; 311. Push guide block; 3 12. First base; 313. Short bolt bracket; 314. First push rod; 315. Short bolt guide groove; 320. Long bolt feeding module; 321. Second push rod; 322. Limiting block; 323. Long bolt bracket; 324. Second base; 410. Long bolt pressing mechanism; 420. Short bolt pressing mechanism; 421. Sliding table; 422. First pressing rod; 423. Traction push rod; 424. Elastic discharge pipe; 425. Feed pipe; 426. Base; 427. Loading bin; 500. Cover. Detailed Implementation

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0032] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] This invention provides a combined bolt press-fitting machine, such as... Figures 1-9As shown, the combined bolt press-fitting machine includes:

[0034] The workbench 100 is provided with a feeding guide rail 110 and a loading platform 120 for moving the cover 500 on its top. The feeding guide rail 110 can also be used to drive the cover 500 to move.

[0035] A pressing unit is suspended above the workbench 100; the pressing unit includes a main drive mechanism 210 and a first pressing module 220 and a second pressing module 230 sliding on the main drive mechanism 210, the first pressing module 220 and the second pressing module 230 being respectively located on both sides below the main drive mechanism 210; the first pressing module 220 and the second pressing module 230 respectively press bolts of different lengths into the cover 500 to be pressed;

[0036] The first press-fit module 220 consists of a set of long bolt press-fit mechanisms 410 and a set of short bolt press-fit mechanisms 420, arranged in a specific pattern.

[0037] The second press-fit module 230 consists of two sets of long bolt press-fit mechanisms 410 and one set of short bolt press-fit mechanisms 420; the two sets of long bolt press-fit mechanisms 410 and short bolt press-fit mechanisms 420 in the second press-fit module 230 are arranged in a way that the two sets of long bolt press-fit mechanisms 410 are arranged adjacent to each other.

[0038] A processing area is provided below the pressing unit. The workbench 100 is also provided with a first feeding module 101, a second feeding module 102, a third feeding module 103, a fourth feeding module 104, and a fifth feeding module 105. The first feeding module 101, the second feeding module 102, and the third feeding module 103 are located on one side of the processing area, the fourth feeding module 104 and the fifth feeding module 105 are located on the other side of the processing area, and the second feeding module 102 is located between the first feeding module and the third feeding module 103.

[0039] The short bolt pressing mechanism 420 in the second pressing module 230 is arranged on the side of the two sets of long bolt pressing mechanisms 410 close to the fourth feeding module 104 and the fifth feeding module 105. The second feeding module 102 supplies long bolts to the set of long bolt pressing mechanisms 410 in the second pressing module 230 that is away from the short bolt pressing mechanism 420. The fifth feeding module 105 supplies long bolts to the set of long bolt pressing mechanisms 410 in the second pressing module 230 that is close to the short bolt pressing mechanism 420.

[0040] The second feeding module 102 supplies long bolts to a set of long bolt pressing mechanisms 410 in the second pressing module 230 that are far away from the short bolt pressing mechanism 420. Here, when the second feeding module 102 is feeding the long bolt pressing mechanism 410, it can simultaneously press and feed the bolts in another set of long bolt pressing mechanisms 410 and the short bolt pressing mechanism 420.

[0041] The third feeding module 103 supplies short bolts to the short bolt pressing mechanism 420 in the first pressing module 220, and the fourth feeding module 104 supplies long bolts to the long bolt pressing mechanism 410 in the first pressing module 220.

[0042] In this application, the main drive mechanism 210 includes a first horizontal slide rail 211, a second horizontal slide rail 212, a third horizontal slide rail 213, and a fourth horizontal slide rail 214. The third horizontal slide rail 213 and the fourth horizontal slide rail 214 slide on the first horizontal slide rail 211 and the second horizontal slide rail 212, respectively. The first pressing module 220 is assembled on the third horizontal slide rail 213, and the second pressing module 230 is assembled on the fourth horizontal slide rail 214. The first pressing module 220 pulls two sets of bolt pressing mechanisms, while the second pressing module 230 pulls three sets of bolt pressing mechanisms.

[0043] The bolt pressing mechanism on the first pressing module 220 can move synchronously, allowing for pressing of bolts on one side of the cover 500. Generally, the bolt holes on the cover 500 are arranged in a straight line. This application enables pressing of multiple bolts on the same side, which are mostly arranged in a straight line. After material handling, the machine only needs to move in the same direction to the corresponding bolt hole to complete the pressing operation, thus reducing the overall machine operating time. Furthermore, by using different loading structures to press different bolts on the same side, the time required for loading structure relocation is reduced. Similarly, the second pressing module 230 presses the bolt holes arranged in a straight line on the other side of the cover 500. The first pressing module 220 and the second pressing module 230 complete their work synchronously, rapidly pressing the bolts on the cover 500 structure. The multiple pressing structures, using a shared drive structure, reduce complex structural design and utilize synchronous motion for batch operations, reducing equipment pressing time and improving bolt pressing efficiency.

[0044] In a preferred embodiment of this invention, two sets of parallel gantry frames are provided on the workbench 100, with the first horizontal slide rail 211 and the second horizontal slide rail 212 respectively provided on different gantry frames; the third horizontal slide rail 213 and the fourth horizontal slide rail 214 have the same structure.

[0045] The third horizontal slide rail 213 consists of a secondary slide rail and a sliding seat. The sliding seat is mounted on the first horizontal slide rail 211 and is equipped with a traction device. The secondary slide rail serves as the bearing device for the first pressing module 220. The sliding seat adopts a U-shaped structure. One end of the sliding seat slides on the first horizontal slide rail 211 via a slider and is driven to move by a hydraulic push rod on the first horizontal slide rail 211. The other end of the sliding seat slides on the gantry frame via a slider and is equipped with an auxiliary slide rail. The secondary slide rail consists of a sliding base plate, a hydraulic push rod, and a track. A set of long bolt pressing mechanisms 410 and a set of short bolt pressing mechanisms 420 are assembled on the sliding base plate that slides on the track. The sliding base plate is displaced by a hydraulic push rod.

[0046] In this embodiment, the sliding base plate is provided with corresponding bolt holes, and the set of long bolt pressing mechanism 410 and the set of short bolt pressing mechanism 420 are assembled on the sliding base plate as needed;

[0047] In a preferred embodiment of this invention, the short bolt pressing mechanism 420 includes a base 426 mounted on a fourth horizontal slide rail 214, a sliding table 421 sliding on the base 426, and a loading chamber 427. The loading chamber 427 is provided with a first pressing rod 422, which pushes the short bolts within the loading chamber 427 into the bolt holes of the workpiece. The sliding table 421 is provided with the loading chamber 427 and an elastic discharge pipe 424 and a feed pipe 425 communicating with the interior of the loading chamber 427. The loading chamber 427 has a cavity for accommodating bolts. The loading chamber 427 slides on the sliding table 421 under the traction of the traction push rod 423 provided on the sliding table 421.

[0048] In this embodiment, the short bolt feeding module 310 includes a pushing guide block 311, a first base 312, and a short bolt bracket 313 for supporting the first base 312. The pushing guide block 311 slides inside the first base 312. The bottom of the first base 312 is provided with an air supply pipe. When the pushing guide block 311 pulls the short bolt to the air outlet of the air supply pipe, the short bolt is transported to the feeding pipe 425 through the conveying pipe under the action of the airflow. When the short bolt delivered by the pneumatic pipe continues to be transported to the sliding table 42 through the feeding pipe 425, the short bolt is then transported to the sliding table 42. 1. The bolt falls through the hole in the sliding table 421 into the cavity inside the loading chamber 427. The traction push rod 423 immediately pulls the loading chamber 427 to align with the first pressing rod 422. The first pressing rod 422 pushes the short bolt into the elastic discharge tube 424 and presses it into the screw hole of the workpiece. The elastic discharge tube 424 adopts an elastic structure design, and the end of the elastic discharge tube 424 adopts a tapered structure design. When the first pressing rod 422 presses, it will force the elastic discharge tube 424 to deform, so that the short bolt can be forced through, thus completing the pressing operation of the short bolt.

[0049] In a preferred embodiment of this invention, the long bolt pressing mechanism 410 uses an electromagnet to magnetically attract the long bolts. The long bolt pressing mechanism 410 includes a slide rail, a slider, and a second pressing rod. The slide rail and slider are designed with a screw motor structure, and the second pressing rod completes the pressing operation of the long bolts under the drive of the screw motor structure.

[0050] The long bolt feeding module 320 includes a limiting block 322, a long bolt bracket 323 and a second base 324. The limiting block 322 for fixing the long bolt is disposed on the second base 324. The second base 324 is mounted on the top of the long bolt bracket 323. The short bolt bracket 313 and the long bolt bracket 323 are connected to the table surface of the workbench 100.

[0051] In this embodiment, the bolt groove formed by the second base 324 and the limiting block 322 is used to fill long bolts. The long bolt pressing mechanism 410 magnetically transfers and presses them into the screw hole of the workpiece. The end of the second pressing rod is provided with a sleeve structure rod head. The rod head is provided with a magnet and a ball-joint structure. The magnet magnetically attracts the long bolt in the bolt groove, and the ball-joint enhances the fixing effect of the bolt. After the transfer is completed, it is pressed onto the cover 500. The pull-out force between the cover 500 and the bolt will make the bolt stay on the cover 500 when the second pressing rod leaves. The second pressing rod release structure adopts the existing technical means and the corresponding technical principle will not be described in detail.

[0052] The limiting block 322 is driven by a second push rod 321 on the second base 324. The limiting block 322 forms a specific groove structure to match the outer bushing on the long bolt, thus positioning the outer bushing on the long bolt. Before the second pressing rod magnetically extracts the bolt, the limiting block 322 needs to move aside under the traction of the second push rod 321. The long bolt structure cannot be directly conveyed by pneumatics, so the feeding operation is achieved through the long bolt feeding module 320.

[0053] As a preferred embodiment of this example, the long bolt feeding module 310 and the short bolt feeding module 320 are fed by guide rails and bolt vibration machines. The bolt vibration machine conveys bolts of different lengths to the bolt groove of the limit block 322 and the assembly groove on the push guide block 311 through vibration and track assistance.

[0054] It should be noted that, for the sake of simplicity, the foregoing embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. A combination bolt press-fitting machine, characterized in that, include: A workbench (100) is provided on top of which a loading platform (120) for moving workpieces is provided; A pressing unit is suspended above the worktable (100); the pressing unit includes a main drive mechanism (210) and a first pressing module (220) and a second pressing module (230) sliding on the main drive mechanism (210), the first pressing module (220) and the second pressing module (230) are respectively located on both sides below the main drive mechanism (210); the first pressing module (220) and the second pressing module (230) press bolts of different lengths into the workpiece respectively; The first pressing module (220) consists of a set of long bolt pressing mechanisms (410) and a set of short bolt pressing mechanisms (420), and the second pressing module (230) consists of two sets of long bolt pressing mechanisms (410) and a set of short bolt pressing mechanisms (420); The workbench (100) is also equipped with a first feeding module (101), a second feeding module (102), a third feeding module (103), a fourth feeding module (104), and a fifth feeding module (105). The first feeding module (101) and the third feeding module (103) supply short bolts to two sets of short bolt pressing mechanisms (420), respectively. The second feeding module (102), the fourth feeding module (104), and the fifth feeding module (105) supply long bolts to three sets of long bolt pressing mechanisms (410), respectively.

2. The combined bolt press-fitting machine as described in claim 1, characterized in that, The main drive mechanism (210) includes a first horizontal slide rail (211), a second horizontal slide rail (212), a third horizontal slide rail (213), and a fourth horizontal slide rail (214). The third horizontal slide rail (213) and the fourth horizontal slide rail (214) slide on the first horizontal slide rail (211) and the second horizontal slide rail (212), respectively. The first pressing module (220) is assembled on the third horizontal slide rail (213), and the second pressing module (230) is assembled on the fourth horizontal slide rail (214).

3. The combined bolt press-fitting machine as described in claim 2, characterized in that, A processing area is provided below the pressing unit. The first feeding module (101), the second feeding module (102) and the third feeding module (103) are located on one side of the processing area. The fourth feeding module (104) and the fifth feeding module (105) are located on the other side of the processing area. The second feeding module (102) is located between the first feeding module and the third feeding module (103).

4. The combined bolt press-fitting machine as described in claim 3, characterized in that, The first pressing module (220) is designed with a set of long bolt pressing mechanisms (410) and a set of short bolt pressing mechanisms (420) arranged together, and the fourth feeding module (104) supplies long bolts to the long bolt pressing mechanism (410).

5. A combined bolt press-fitting machine as described in claim 4, characterized in that, The second pressing module (230) has two sets of long bolt pressing mechanisms (410) and short bolt pressing mechanisms (420) arranged in an adjacent manner. The short bolt pressing mechanisms (420) are located on the side of the two sets of long bolt pressing mechanisms (410) close to the fourth feeding module (104) and the fifth feeding module (105). The second feeding module (102) supplies long bolts to the set of long bolt pressing mechanisms (410) in the second pressing module (230) that is away from the short bolt pressing mechanism (420). The fifth feeding module (105) supplies long bolts to the set of long bolt pressing mechanisms (410) in the second pressing module (230) that is close to the short bolt pressing mechanism (420).

6. A combined bolt press-fitting machine as described in claim 5, characterized in that, The first horizontal slide rail (211) and the second horizontal slide rail (212) are arranged parallel to each other, and the third horizontal slide rail (213) and the fourth horizontal slide rail (214) are arranged parallel to each other and perpendicular to the first horizontal slide rail (211).

7. A combined bolt press-fitting machine as described in claim 6, characterized in that, The short bolt pressing mechanism (420) includes a base (426) assembled on a fourth horizontal slide rail (214), a sliding table (421) sliding on the base (426), and a loading chamber (427). The loading chamber (427) is provided with a first pressing rod (422), which pushes the short bolt in the loading chamber (427) into the screw hole of the workpiece.

8. A combined bolt press-fitting machine as described in claim 7, characterized in that, The sliding table (421) is provided with a loading chamber (427) and an elastic discharge pipe (424) and a feed pipe (425) communicating with the inside of the loading chamber (427). The short bolts delivered by the pneumatic pipe enter the loading chamber (427) through the feed pipe (425). The first pressing rod (422) pushes the short bolts into the elastic discharge pipe (424) and presses them into the screw hole of the workpiece.

9. A combined bolt press-fitting machine as described in claim 8, characterized in that, The short bolt feeding module (310) includes a push guide block (311), a first base (312), and a short bolt bracket (313) for supporting the first base (312). The push guide block (311) slides inside the first base (312). The bottom of the first base (312) is provided with an air supply pipe. When the push guide block (311) pulls the short bolt to the air supply pipe outlet, the short bolt is transported to the feeding pipe (425) through the conveying pipe under the action of the air flow.

10. A combined bolt press-fitting machine as described in claim 9, characterized in that, The long bolt feeding module (320) includes a limiting block (322), a long bolt bracket (323), and a second base (324). The limiting block (322) for fixing the long bolt is set on the second base (324), which is mounted on top of the long bolt bracket (323). The second base (324) and the limiting block (322) are filled with long bolts. The long bolts are magnetically transferred and pressed into the screw holes of the workpiece by the long bolt pressing mechanism (410).