Mounting device for repeated stretching of connecting rod bolt

Abstract

The utility model relates to the technical field of machining tools, in particular to a mounting device for multiple stretching of a connecting rod bolt, which is used for mounting the connecting rod bolt on a connecting rod, the connecting rod comprises a connecting rod body large hole end, a connecting rod cover and a connecting rod body small hole end, first threaded holes are symmetrically formed in the connecting rod body large hole end, and second threaded holes are symmetrically formed in the connecting rod cover. One first threaded hole corresponds to one second threaded hole, the connecting rod bolt is connected into the first threaded holes and the second threaded holes in a matched mode, the installation device for repeated stretching of the connecting rod bolt comprises symmetrically-arranged installation supports and a fixing support located between the two installation supports, and a connecting rod is installed on the fixing support; a first limiting support and a second limiting support are arranged on the installation support close to the connecting rod cover, limiting baffles are arranged on the first limiting support and the second limiting support, the limiting baffles right face second threaded holes in the connecting rod cover, and the limiting baffles are located between the connecting rod bolt and the end face of the second threaded holes.

Description

Technical Field

[0001] The utility model relates to the technical field of processing tooling, in particular to an installation device for multiple stretching of connecting rod bolts. Background Art

[0002] The connecting rod of a medium- and high-speed high-power diesel engine is composed of a connecting rod cap, a connecting rod body, a large-hole end of the connecting rod body, a small-hole end of the connecting rod body, etc. For details, please refer to Figure 1 The described connecting rod includes: a connecting rod body 10, a large-hole end 11 of the connecting rod body, a connecting rod cap 12, and a small-hole end 13 of the connecting rod body. Symmetric first threaded holes 14 are provided on the large-hole end 11 of the connecting rod body, and symmetric second threaded holes 15 are provided on the connecting rod cap 12. One first threaded hole 14 corresponds to one second threaded hole 15, and the first threaded hole 14 and the second threaded hole 15 are coaxially arranged. When in use, the connecting rod cap 12 is installed on the large-hole end 11 of the connecting rod body by using a connecting rod bolt to cooperate and connect in the first threaded hole 14 and the second threaded hole 15.

[0003] During the tightening process of the connecting rod bolt, the direct tension method is a commonly used bolt tightening method. This method mainly applies tension to generate friction and pre-tightening force between the bolt and the base material to achieve the purpose of bolt tightening. The connecting rod bolt is stretched to make it elongate, so as to form pressure between the parts, and thus make the connection more tight. Modern connecting rod bolt stretching processes include various methods such as torque control tightening, angle control tightening, and elongation control tightening. Torque control is the most commonly used method, and the pre-tightening force is controlled by tightening to the rated torque required for the specified pre-tightening force. Angle control tightening sets an angle monitoring range in the final tightening stage, and the specified pre-tightening force is achieved by the number of rotation degrees. Elongation control tightening minimizes the influence brought by friction and its scatter to achieve a very precise pre-tightening force.

[0004] For example, Chinese Patent CN212577977U discloses a special bolt guiding device for a connecting rod, which includes a bolt guiding head, a base, and a connecting member. A plurality of bolt guiding heads are connected to the installation groove of the base through the connecting member, and a spring for resetting is arranged between the tail of the bolt guiding head and the base; after a plurality of bolt guiding heads are spliced with the base together, a bolt installation guiding channel is formed. Two groups of bolt installation guiding channels are arranged side by side and correspond to the screw holes at the large end of the connecting rod one by one. The above patent is applicable to the guiding operation of bolts of various models entering the bolt holes, and is not prone to deflection, with precise guiding. However, when tightening the connecting rod bolt, it is impossible to accurately control the elongation of the connecting rod bolt, resulting in the connecting rod bolt being prone to fracture under complex working conditions and long-term operation, seriously affecting the reliability and safety of the equipment.

[0005] Therefore, it is necessary for those skilled in the art to provide an installation device for multiple stretching of connecting rod bolts, which can minimize the influence of friction and its dispersion by controlling the extension amount of each tightening, improve the tightening effect, and thus ensure the strength and toughness of the connecting rod bolts during use. Summary of the Invention

[0006] The purpose of the utility model is to provide an installation device for multiple stretching of connecting rod bolts, so as to solve the technical problem that the elongation required for tightening the connecting rod bolts in the prior art cannot be accurately controlled, resulting in easy fracture of the connecting rod bolts under complex working conditions and long-term operation.

[0007] The technical solution adopted by the utility model to solve its technical problems is: an installation device for multiple stretching of connecting rod bolts, which is used to install the connecting rod bolts on the connecting rod. The connecting rod includes a large-hole end of the connecting rod body, a connecting rod cap, and a small-hole end of the connecting rod body. Symmetric first threaded holes are provided on the large-hole end of the connecting rod body, and symmetric second threaded holes are provided on the connecting rod cap. One first threaded hole corresponds to one second threaded hole. The connecting rod bolts are fitted and connected into the first threaded holes and the second threaded holes. The installation device for multiple stretching of the connecting rod bolts includes symmetrically arranged installation brackets and a fixed bracket located between the two installation brackets. The connecting rod is installed on the fixed bracket. A first limiting bracket and a second limiting bracket are provided on the installation bracket close to the connecting rod cap. Limiting baffles are provided on the first limiting bracket and the second limiting bracket. The limiting baffles are facing the second threaded holes on the connecting rod cap, and the limiting baffles are located between the end faces of the connecting rod bolts and the second threaded holes.

[0008] Further, the limiting baffle is in a semi-circular arc structure. The locking nut passes through the limiting baffle and is fitted and connected into the second threaded hole and the first threaded hole. A gap is left between the limiting baffle and the end face of the second threaded hole.

[0009] Further, two second threaded holes are provided on one connecting rod cap. The limiting baffle on the first limiting bracket is facing one second threaded hole, and the limiting baffle on the second limiting bracket is facing the other second threaded hole. The screw head of the connecting rod bolt can abut against the limiting baffle.

[0010] Further, the first limiting bracket is in an inverted U-shaped frame structure, and the first limiting bracket is installed on the top of the installation bracket.

[0011] Further, the second limiting bracket is in a square plate structure, and the second limiting bracket is installed on the side of the installation bracket close to the connecting rod cap.

[0012] Further, the threaded part of the connecting rod bolt passes through the second threaded hole and extends into the first threaded hole, and the screw head part of the connecting rod bolt can abut against the end face of the second threaded hole.

[0013] Further, the installation device for multiple tensile tests of the connecting rod bolt further includes a base, on which installation brackets are symmetrically arranged. At the same time, the installation brackets are slidably arranged on the base and are detachably connected to the base, and a fixing bracket is detachably connected between the two installation brackets.

[0014] Further, positioning pins and positioning screws are provided on both sides of the fixing bracket. The positioning pins and positioning screws respectively penetrate the wall of the fixing bracket and are horizontally arranged inside the fixing bracket.

[0015] Further, the large-hole end of the connecting rod body and the connecting rod cap are cooperatively connected inside the positioning screw, and the small-hole end of the connecting rod body is cooperatively connected inside the positioning pin. A locking nut is threadedly connected to the positioning screw, and the locking nut abuts against the side wall of the large-hole end of the connecting rod body.

[0016] The beneficial effects of the present utility model are as follows: By using the limit baffle, the connecting rod bolt cannot be screwed into the connecting rod at one time, thereby realizing multiple tensile tests. By controlling the tightening method with the elongation amount, through the tightening process of two tensile tests, the problem of elongation amount change caused by factors such as deformation of the connecting rod bolt hole and uneven contact surface can be effectively solved, so as to improve the stability and reliability of the bolt connection, avoid equipment failures caused by loosening or fracture, and reduce production and equipment maintenance costs. Description of the Drawings

[0017] Figure 1 is a connecting rod.

[0018] Figure 2 is a perspective view of the installation device for multiple tensile tests of the connecting rod bolt of the present utility model.

[0019] Figure 3 is an exploded view of the installation device for multiple tensile tests of the connecting rod bolt of the present utility model.

[0020] Figure 4 is a top view of the installation device for multiple tensile tests of the connecting rod bolt of the present utility model.

[0021] Figure 5 is Figure 4 a cross-sectional view taken along A-A in

[0022] Figure 6 is Figure 2 a partially enlarged schematic view of part A in

[0023] The markings of the various components in the drawings are as follows: 10, connecting rod; 11, large-hole end of the connecting rod body; 12, connecting rod cap; 13, small-hole end of the connecting rod body; 14, first threaded hole; 15, second threaded hole; 16, connecting rod bolt; 20, base; 21, mounting bracket; 22, fixing bracket; 23, positioning pin; 24, positioning screw; 25, locking nut; 30, first limiting bracket; 31, second limiting bracket; 32, limiting baffle. Detailed implementation mode

[0024] Now, the present utility model will be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present utility model in a schematic manner, so it only shows the components related to the present utility model.

[0025] Please refer to Figure 1 , Figure 2 , the present utility model provides an installation device for multiple stretching of connecting rod bolts, which is used to install the connecting rod bolt 16 onto the connecting rod 10. The connecting rod 10 includes a large-hole end 11 of the connecting rod body, a connecting rod cap 12, and a small-hole end 13 of the connecting rod body. First threaded holes 14 are symmetrically arranged on the large-hole end 11 of the connecting rod body, and second threaded holes 15 are symmetrically arranged on the connecting rod cap 12. One first threaded hole 14 corresponds to one second threaded hole 15, and the first threaded hole 14 and the second threaded hole 15 are coaxially arranged. The connecting rod bolt 16 is fitted and connected into the first threaded hole 14 and the second threaded hole 15. The threaded portion of the connecting rod bolt 16 passes through the second threaded hole 15 and extends into the first threaded hole 14, and the screw head portion of the connecting rod bolt 16 can abut against the end face of the second threaded hole 15. During use, by adopting the method of controlling the tightening with the elongation amount, the connecting rod bolt 16 is screwed into the connecting rod 10 in several times. By minimizing the influence brought by friction and its scatter, very precise pre-tightening force control is achieved, and then the connecting rod cap 12 is stably installed on the large-hole end 11 of the connecting rod body, ensuring the use stability.

[0026] Please refer to Figure 3 , Figure 4 , the installation device for multiple stretching of the connecting rod bolt includes a base 20, mounting brackets 21 symmetrically arranged on the base 20, and a fixing bracket 22 located between the two mounting brackets 21. The connecting rod 10 is installed on the fixing bracket 22 to facilitate the subsequent stable installation of the connecting rod bolt 16 onto the connecting rod 10.

[0027] Further, the mounting bracket 21 is slidably arranged on the base 20 and is detachably connected to the base 20 by fasteners such as bolts or screws, and the fixing bracket 22 is detachably connected between the two mounting brackets 21. During use, a fixing bracket 22 with a different length is adaptively selected according to the link 10 of different sizes, and then the fixing bracket 22 is installed between the two mounting brackets 21 and then the mounting bracket 21 is fixedly connected to the base 20, so that the link 10 can stably install the link bolt 16.

[0028] In this embodiment, the base 20 has a square block structure, and a track (not shown in the figure) is provided on the upper plane of the base 20. A slide rail (not shown in the figure) is provided on the bottom surface of the mounting bracket 21. The slide rail is fitted and connected in the track and can move along the extension direction of the track, so that the mounting bracket 21 can stably move on the base 20 according to the track, thereby ensuring the stability of the installation.

[0029] Further, positioning pins 23 and positioning screws 24 are provided on both sides of the fixing bracket 22. The positioning pins 23 and the positioning screws 24 respectively penetrate through the wall of the fixing bracket 22 and are horizontally arranged inside the fixing bracket 22. The large-hole end 11 of the link body and the link cover 12 are fitted and connected in the positioning screw 24, and the small-hole end 13 of the link body is fitted and connected in the positioning pin 23. A locking nut 25 is threadedly connected to the positioning screw 24, and the locking nut 25 abuts against the side wall of the large-hole end 11 of the link body.

[0030] During use, the holes at both ends of the link 10 are respectively fitted and connected to the positioning pin 23 and the positioning screw 24 to realize the installation of the link 10. Then, the locking nut 25 is fitted and connected to the positioning screw 24 and abuts against the side wall of the link 10 to realize locking the link 10 to the fixing bracket 22 and complete the installation and locking.

[0031] Further, a first limiting bracket 30 and a second limiting bracket 31 are provided on the mounting bracket 21 close to the link cover 12. A limiting baffle 32 is provided on the first limiting bracket 30 and the second limiting bracket 31, and the limiting baffle 32 faces the second threaded hole 15 on the link cover 12. The locking nut 25 passes through the limiting baffle 32 and is fitted and connected to the second threaded hole 15. A gap is left between the limiting baffle 32 and the end face of the second threaded hole 15.

[0032] Specifically, there are two second threaded holes 15 on one link cover 12. The limiting baffle 32 on the first limiting bracket 30 faces one second threaded hole 15, and the limiting baffle 32 on the second limiting bracket 31 faces the other second threaded hole 15. The screw head of the link bolt 16 can abut against the limiting baffle 32.

[0033] The first limiting bracket 30 is in an inverted U-shaped frame structure. The first limiting bracket 30 is installed on the top of the mounting bracket 21, and fasteners such as pins or screws are used to fixedly connect the first limiting bracket 30 to the top of the mounting bracket 21.

[0034] The second limiting bracket 31 is in a square plate-like structure. The second limiting bracket 31 is installed on the side of the mounting bracket 21 near the connecting rod cover 12, and fasteners such as pins or screws are used to fixedly connect the second limiting bracket 31 to the side of the mounting bracket 21.

[0035] During use, the limiting baffle 32 is used to prevent the connecting rod bolt 16 from being screwed into the connecting rod 10 at one time, thereby realizing multiple stretches. After the connecting rod bolt 16 is first screwed into the connecting rod 10, the connecting rod bolt 16 is abutted against the limiting baffle 32, and then the limiting baffle 32 is removed. The connecting rod bolt 16 is then screwed into the connecting rod 10 for the second time to complete the installation.

[0036] The utility model adopts a tightening process of stretching twice to effectively solve the problem of elongation change caused by factors such as deformation of the connecting rod bolt hole and uneven contact surface, thereby improving the stability and reliability of bolt connection, avoiding equipment failures caused by loosening or breakage, and reducing production and equipment maintenance costs.

[0037] In this embodiment, the limiting baffle 32 is in a semi-circular arc structure. The limiting baffle 32 is located between the end faces of the connecting rod bolt 16 and the second threaded hole 15. The semi-circular limiting baffle 32 enables it to quickly disengage from between the end faces of the connecting rod bolt 16 and the second threaded hole 15, thereby realizing stretching twice.

[0038] The specific operation method of the utility model is as follows: Step 1: The holes at both ends of the connecting rod 10 are respectively connected in cooperation with the positioning pin 23 and the positioning screw 24 to realize the installation of the connecting rod 10. Then, the locking nut 25 is connected in cooperation with the positioning screw 24 and abutted against the side wall of the connecting rod 10 to realize locking the connecting rod 10 to the fixed bracket 22 to complete the installation and locking.

[0039] Step 2: Fasteners such as pins or screws are used to fixedly connect the first limiting bracket 30 to the top of the mounting bracket 21. At the same time, fasteners such as pins or screws are used to fixedly connect the second limiting bracket 31 to the side of the mounting bracket 21. The limiting baffle 32 on the first limiting bracket 30 and the second limiting bracket 31 faces the second threaded hole 15 on the connecting rod cover 12 to complete positioning and limiting.

[0040] Step 3: Screw the connecting rod bolt 16 into the second threaded hole 15 on the connecting rod 10. After the connecting rod bolt 16 is first screwed into the connecting rod 10, the connecting rod bolt 16 is abutted against the limit baffle 32 to achieve limitation. Then, remove the limit baffle 32, and screw the connecting rod bolt 16 into the connecting rod 10 for the second time to complete the installation.

[0041] The utility model uses the limit baffle 32 to prevent the connecting rod bolt 16 from being screwed into the connecting rod 10 at one time, thereby realizing multiple stretches. By using the method of controlling the tightening with the elongation amount, through the tightening process of two stretches, the problem of elongation amount change caused by factors such as deformation of the connecting rod bolt hole and uneven contact surface can be effectively solved, so as to improve the stability and reliability of the bolt connection, avoid equipment failures caused by loosening or breaking, and reduce the production and equipment maintenance costs.

[0042] It can be understood that the present utility model is described through some embodiments. As is known to those skilled in the art, without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. An installation device for multiple tensile tests of connecting rod bolts, which is used to install the connecting rod bolts (16) onto the connecting rod (10). The connecting rod (10) includes a large-hole end (11) of the connecting rod body, a connecting rod cap (12), and a small-hole end (13) of the connecting rod body. Symmetrically arranged first threaded holes (14) are provided on the large-hole end (11) of the connecting rod body, and symmetrically arranged second threaded holes (15) are provided on the connecting rod cap (12). One first threaded hole (14) corresponds to one second threaded hole (15). The connecting rod bolts (16) are fitted and connected into the first threaded holes (14) and the second threaded holes (15). It is characterized in that, The installation device for multiple tensile tests of the connecting rod bolt includes symmetrically arranged mounting brackets (21) and a fixed bracket (22) located between the two mounting brackets (21). The connecting rod (10) is mounted on the fixed bracket (22). A first limit bracket (30) and a second limit bracket (31) are provided on the mounting bracket (21) close to the connecting rod cap (12). A limit baffle (32) is provided on the first limit bracket (30) and the second limit bracket (31). The limit baffle (32) faces the second threaded hole (15) on the connecting rod cap (12), and the limit baffle (32) is located between the end faces of the connecting rod bolt (16) and the second threaded hole (15).

2. The installation device for multiple tensile tests of connecting rod bolts according to claim 1, characterized in that The limit baffle (32) is in a semi-circular arc structure. The lock nut (25) passes through the limit baffle (32) and is connected to the second threaded hole (15) and the first threaded hole (14) in a mating manner. A gap is left between the limit baffle (32) and the end face of the second threaded hole (15).

3. The mounting device for multiple stretching of connecting rod bolts according to claim 2, characterized in that, There are two second threaded holes (15) on one connecting rod cap (12). The limit baffle (32) on the first limit bracket (30) faces one second threaded hole (15), and the limit baffle (32) on the second limit bracket (31) faces the other second threaded hole (15). The head of the connecting rod bolt (16) can abut against the limit baffle (32).

4. The mounting device for multiple stretching of connecting rod bolts according to claim 1, characterized in that, The first limit bracket (30) is in an inverted U-shaped frame structure and is mounted on the top of the mounting bracket (21).

5. The mounting device for multiple stretching of the connecting rod bolt according to claim 1, characterized in that, The second limit bracket (31) is in a square plate structure and is mounted on the side of the mounting bracket (21) close to the connecting rod cap (12).

6. The mounting device for multiple tensile tests of connecting rod bolts according to claim 2, characterized in that, The threaded part of the connecting rod bolt (16) passes through the second threaded hole (15) and extends into the first threaded hole (14). The head of the connecting rod bolt (16) can abut against the end face of the second threaded hole (15).

7. The installation device for multiple stretching of connecting rod bolts according to claim 1, characterized in that, The installation device for multiple tensile tests of the connecting rod bolt further includes a base (20). The mounting brackets (21) are symmetrically arranged on the base (20). At the same time, the mounting brackets (21) are slidably arranged on the base (20) and are detachably connected to the base (20). The fixed bracket (22) is detachably connected between the two mounting brackets (21).

8. The mounting device for multiple tensile tests of connecting rod bolts according to claim 7, characterized in that, Positioning pins (23) and positioning screws (24) are provided on both sides of the fixed bracket (22). The positioning pins (23) and the positioning screws (24) respectively penetrate the wall of the fixed bracket (22) and are horizontally arranged inside the fixed bracket (22).

9. The installation device for multiple tensile tests of connecting rod bolts according to claim 8, characterized in that, The large-hole end (11) of the connecting rod body and the connecting rod cap (12) are connected to the positioning screw (24) in a mating manner. The small-hole end (13) of the connecting rod body is connected to the positioning pin (23) in a mating manner. A lock nut (25) is threadedly connected to the positioning screw (24), and the lock nut (25) abuts against the side wall of the large-hole end (11) of the connecting rod body.

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