Device and method for multi-point impact step-by-step strengthening of pipe

Abstract

The invention belongs to the field of pipe processing, and discloses a device and a method for multi-point impact step-by-step reinforcement of a pipe. The device comprises a bed body, a plurality of circumferential strengthening devices, a fixing device and a supporting device, the circumferential strengthening devices are fixedly connected with the bed body through the fixing device, the circumferential strengthening devices comprise a plurality of single-point strengthening devices evenly distributed along the circumference, and the single-point strengthening devices on different circumferential strengthening devices are distributed in a staggered mode. A round hole is formed in the center of each circumferential strengthening device, the two supporting devices are located at the two ends of the circumferential strengthening devices respectively, and the supporting devices are coaxial with the round holes. The pipe is fed into the working range of the circumferential strengthening device through the supporting device, the to-be-strengthened pipe is subjected to impact strengthening through the single-point strengthening device which is evenly distributed in the circumferential direction and impacts at a high speed, the structure is reliable, the use performance is good, the strengthening effect of the surface of the metal pipe is improved, and the strengthening efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of pipe processing, and in particular relates to a device and method for multi-point impact step-by-step strengthening of pipes. Background Art

[0002] Metal pipes are important parts in industrial equipment. In some applications, the surface of metal pipes is impacted by solid and liquid media, causing various defects such as wear, corrosion and fatigue, which makes the pipes fail and reduces the service life of metal pipes. In order to improve its service life, the surface of the pipes can be strengthened. At present, the methods that can achieve pipe surface strengthening include surface mechanical grinding, shot peening, high-pressure torsion, equal channel extrusion, surface mechanical grinding and surface mechanical rolling. Among them, shot peening strengthening technology is the most widely used. Due to the arc shape of the pipe surface, the pellets cannot effectively impact, resulting in the inability to implement strengthening or insufficient shot peening intensity; shot peening strengthening single nozzle, low efficiency, high energy consumption; randomly ejected projectiles cannot guarantee the strengthening coverage of the pipe surface; discrete projectile strengthening process is very polluting to the environment. Moreover, the equipment of these technologies is usually complex in structure, low strengthening efficiency, high cost, and strict requirements on the shape of the strengthened pipe, which cannot meet the actual needs of strengthening the outer surface of the pipe.

[0003] Therefore, it is necessary to design a device and method for multi-point impact step-by-step strengthening of pipes, which has a simple and reliable structure and good performance, and can strengthen the outer surface of pipes of different diameters and lengths to improve the strengthening efficiency. Summary of the invention

[0004] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a device and method for multi-point impact step-by-step strengthening of pipes, which has a simple and reliable structure and good performance. It can strengthen the outer surface of pipes of different diameters and lengths and improve the strengthening efficiency.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A device for multi-point impact step-by-step strengthening of pipes comprises: a bed, a plurality of circumferential strengthening devices, a fixing device and a supporting device, wherein the plurality of circumferential strengthening devices are fixedly connected to the bed through the fixing device, the circumferential strengthening devices comprise a plurality of single-point strengthening devices uniformly distributed along the circumference, the single-point strengthening devices on different circumferential strengthening devices are staggered, the plurality of circumferential strengthening devices are coaxial, a circular hole is provided at the center of the circumferential strengthening device, the diameter of the circular hole is not less than the diameter of the pipe, two supporting devices are respectively located at the two ends of the plurality of circumferential strengthening devices, and the supporting device is coaxial with the circular hole.

[0007] In some embodiments of the present invention, the device for multi-point impact step-by-step strengthening of the pipe includes three circumferential strengthening devices, and the single-point strengthening devices on the three circumferential strengthening devices cover the cross-sectional circumference of the pipe.

[0008] In some embodiments of the present invention, the supporting device includes two rollers arranged in parallel, the two ends of the two rollers are fixedly connected to the bed body through a mounting plate, the two rollers are parallel to the end faces of the circumferential reinforcement device, and the opposite surfaces of the two rollers are in contact with the outer surface of the pipe.

[0009] In some embodiments of the present invention, the roller is connected to a first motor.

[0010] In some embodiments of the present invention, the single-point strengthening device includes a housing, a second motor, a disc, a connecting rod, a cylinder, a first piston, a second piston, an impact rod, and a strengthening head;

[0011] The second motor and the disc are arranged in the housing, and one end of the cylinder is inserted into the housing and fixedly connected to the housing;

[0012] The output end of the second motor is connected to the center of the disk;

[0013] One end of the connecting rod is eccentrically connected to the disc, and the other end of the connecting rod is connected to the first piston in the cylinder body;

[0014] The second piston in the cylinder body is connected to one end of the impact rod; the other end of the impact rod is connected to the strengthening head;

[0015] The strengthening head contacts the surface of the pipe, and a plurality of strengthening heads surround to form a circular hole.

[0016] In some embodiments of the present invention, a plurality of connection points are provided on the end surface of the disk, and the connection points are used to connect the connecting rods, and the distances between the plurality of connection points and the center of the disk are different.

[0017] On the other hand, the present invention also discloses a method for multi-point impact step-by-step strengthening of a pipe, comprising the following steps:

[0018] Clamp one end of the pipe on the supporting device;

[0019] Activate multiple circumferential strengthening devices;

[0020] The pipe is sequentially fed into a plurality of circumferential strengthening devices through a supporting device, and the entire surface of the pipe is strengthened after being impacted by the circumferentially distributed single-point strengthening devices.

[0021] In some embodiments of the present invention, the pipe is sequentially fed into a plurality of circumferential strengthening devices through a supporting device, including:

[0022] The first motor is started to drive the roller to rotate, so that the roller drives the pipe to feed at a uniform speed.

[0023] In some embodiments of the present invention, the single-point strengthening device includes a second motor, and the strengthening impact force is adjusted by adjusting the rotation speed of the second motor.

[0024] In some embodiments of the present invention, the second motor is connected to the connecting rod via a disc, and the degree of surface strengthening of the pipe is adjusted by adjusting the connection position between the connecting rod and the disc.

[0025] Technical effects and advantages of the present invention:

[0026] The present invention designs a device for multi-point impact step-by-step strengthening of pipes, which includes a bed, a multi-stage circumferential strengthening device arranged on the bed, and a supporting device capable of driving the pipes to be fed at a uniform speed. The pipes are fed into the working range of the circumferential strengthening device through the supporting device, and the pipes to be strengthened are impact strengthened by a single-point strengthening device which is uniformly distributed around the circumference and impacts at a high speed. As the pipes move horizontally, the entire surface area of ​​the pipes is gradually covered and strengthened. The device has a reliable structure and good performance, and effectively realizes reliable strengthening of metal pipes. Through the coordinated arrangement between the supporting device and the single-point strengthening device, the surface of the metal pipes is subjected to large plastic deformation, thereby realizing grain refinement on the surface of the pipes, generating a gradient structure on the surface of the pipes themselves, improving the strengthening effect of the surface of the metal pipes, and improving the strengthening efficiency.

[0027] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a device for multi-point impact step-by-step strengthening of a pipe according to the present invention;

[0029] Figure 2 It is a structural schematic diagram of the single-point strengthening device of the present invention;

[0030] Figure 3 It is a schematic diagram of the disc structure of the present invention.

[0031] Figure numerals: 1. bed; 2. circumferential reinforcement device; 3. fixing device; 4. supporting device; 5. single-point reinforcement device; 6. roller; 7. mounting plate; 8. first motor; 9. second motor; 10. disc; 11. connecting rod; 12. cylinder body; 13. first piston; 14. second piston; 15. impact rod; 16. reinforcement head; 17. connection point. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1 As shown, the present invention provides a device for multi-point impact step-by-step strengthening of pipes, comprising: a bed 1, a plurality of circumferential strengthening devices 2, a fixing device 3 and a supporting device 4, wherein the plurality of circumferential strengthening devices 2 are fixedly connected to the bed 1 via the fixing device 3, the circumferential strengthening devices 2 include a plurality of single-point strengthening devices 5 uniformly distributed along the circumference, the single-point strengthening devices 5 on different circumferential strengthening devices 2 are staggered, the plurality of circumferential strengthening devices 2 are coaxial, a circular hole is provided at the center of the circumferential strengthening device 2, the diameter of the circular hole is greater than the diameter of the pipe, and two supporting devices 4 are respectively located at both ends of the plurality of circumferential strengthening devices 2, and the supporting device 4 is coaxial with the circular hole.

[0034] In some embodiments of the present invention, the device for multi-point impact step-by-step strengthening of pipes includes three circumferential strengthening devices 2, and the single-point strengthening devices 5 on the three circumferential strengthening devices 2 cover the cross-sectional circumference of the pipe. The pipe enters the first-level circumferential strengthening device 2, and under the impact of the circumferentially distributed single-point strengthening devices 5, the circumferential surface of the pipe is partially strengthened; then the pipe enters the second-level circumferential strengthening device 2, and another part of the circumference of the pipe is strengthened; finally, the pipe enters the third-level circumferential strengthening device 2, and the remaining part of the circumferential surface of the pipe is strengthened, and finally the entire surface of the pipe is strengthened.

[0035] In some embodiments of the present invention, the supporting device 4 includes two rollers 6, both ends of which are fixedly connected to the bed 1 through a mounting plate 7, the two rollers 6 are parallel to the end faces of the circumferential reinforcement device 2, and the opposite surfaces of the two rollers 6 are in contact with the outer surface of the pipe.

[0036] In some embodiments of the present invention, the roller 6 is connected to a first motor 8 .

[0037] In some embodiments of the present invention, Figure 2As shown, the single-point strengthening device 5 includes a shell, a second motor 9, a disc 10, a connecting rod 11, a cylinder body 12, a first piston 13, a second piston 14, an impact rod 15 and a strengthening head 16. The second motor 9 and the disc 10 are arranged in the shell, and one end of the cylinder body 12 is inserted into the shell and fixedly connected to the shell; the output end of the second motor 9 is connected to the center of the disc 10, one end of the connecting rod 11 is eccentrically connected to the disc 10, and the other end of the connecting rod 11 is connected to the first piston 13 in the cylinder body 12, the second piston 14 in the cylinder body 12 is connected to one end of the impact rod 15, and the other end of the impact rod 15 is connected to the strengthening head 16, and the strengthening head 16 contacts the surface of the pipe, and a plurality of strengthening heads 16 surround to form a circular hole.

[0038] In some embodiments of the present invention, Figure 3 As shown, the end face of the disk 10 is provided with a plurality of connection points 17, and the connection points 17 are used to connect the connecting rod 11. The distances between the plurality of connection points 17 and the center of the disk 10 are different, so that the connection position between the disk 10 and the connecting rod 11 can be easily changed, and the degree of strengthening can be effectively adjusted.

[0039] On the other hand, the present invention also discloses a method for multi-point impact step-by-step strengthening of a pipe, comprising the following steps:

[0040] Clamp one end of the pipe on the supporting device 4;

[0041] Activate multiple circumferential reinforcement devices 2;

[0042] The pipe is sequentially fed into a plurality of circumferential strengthening devices 2 through the support device 4, and is impacted by the circumferentially distributed single-point strengthening devices 5 to achieve full strengthening of the pipe surface.

[0043] In some embodiments of the present invention, the pipe is sequentially fed into a plurality of circumferential strengthening devices 2 through a supporting device 4, including:

[0044] The first motor 8 is started to drive the roller 6 to rotate, so that the roller 6 drives the pipe to be fed at a uniform speed.

[0045] In some embodiments of the present invention, the single-point strengthening device 5 includes a second motor 9, and the strengthening impact force is adjusted by adjusting the rotation speed of the second motor 9.

[0046] In some embodiments of the present invention, the second motor 9 is connected to the connecting rod 11 via the disc 10, and the surface strengthening degree of the pipe is adjusted by adjusting the connection position between the connecting rod 11 and the disc 10.

[0047] The working principle of the device of the present invention is as follows:

[0048] During the tube strengthening process, the multi-stage circumferential strengthening device 2 is started step by step, that is, the second motor 9 in the single-point strengthening device 5 on each stage of the circumferential strengthening device 2 is started, driving the disc 10 to rotate, driving one end of the eccentrically installed connecting rod 11 to make a circular motion, and the other end of the connecting rod 11 drives the first piston 13 to reciprocate in the cylinder body 12, thereby compressing the air between the first piston 13 and the second piston 14. The compressed air pushes the second piston 14 to move, and the piston 14 drives the impact rod 15 and the strengthening head 16 to move. As the disc 10 rotates, the strengthening head 16 reciprocates;

[0049] The first motor 8 is started, and the first motor 8 drives the roller 6 to rotate, so that the roller 6 drives the tube to be fed at a uniform speed, and the tube to be strengthened is sequentially fed into the multi-stage circumferential strengthening device 2. Under the action of each stage of the circumferential strengthening device 2, the surface is gradually cumulatively strengthened;

[0050] In order to protect the impact rod 15 and the strengthening head 16 and reduce the force applied thereto in a direction perpendicular to the moving direction, a strengthening method is adopted in which the single-point strengthening devices 5 are moved simultaneously and the pipe to be strengthened is fed intermittently.

[0051] In summary, the present invention designs a device for multi-point impact step-by-step strengthening of pipes, including a bed 1, a multi-stage circumferential strengthening device 2 arranged on the bed 1 and a support device 4 that can drive the pipe to be fed at a uniform speed. The pipe is fed into the working range of the circumferential strengthening device 2 through the support device 4, and the pipe to be strengthened is impact strengthened by a single-point strengthening device 5 that is uniformly distributed around the circumference and impacts at high speed. As the pipe moves horizontally, the entire surface area of ​​the pipe is gradually covered and strengthened. The structure is reliable and the performance is good, and the reliable strengthening of the metal pipe is effectively achieved. Through the coordinated arrangement between the support device 4 and the single-point strengthening device 5, the surface of the metal pipe is subjected to large plastic deformation, thereby achieving grain refinement on the surface of the pipe, generating a gradient structure on the surface of the pipe itself, improving the strengthening effect of the surface of the metal pipe, and improving the strengthening efficiency.

[0052] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for multi-point impact step-by-step strengthening of pipes, characterized in that: include: A bed (1), a plurality of circumferential reinforcement devices (2), a fixing device (3) and a supporting device (4), wherein the plurality of circumferential reinforcement devices (2) are fixedly connected to the bed (1) via the fixing device (3), the circumferential reinforcement devices (2) include a plurality of single-point reinforcement devices (5) uniformly distributed along the circumference, the single-point reinforcement devices (5) on different circumferential reinforcement devices (2) are staggered, the plurality of circumferential reinforcement devices (2) are coaxial, a circular hole is provided at the center of the circumferential reinforcement device (2), the diameter of the circular hole is not less than the diameter of the pipe, and the two supporting devices (4) are respectively located at the two ends of the plurality of circumferential reinforcement devices (2), and the supporting device (4) is coaxial with the circular hole.

2. The device for multi-point impact step-by-step strengthening of pipes according to claim 1, characterized in that: It comprises three circumferential reinforcement devices (2), wherein the single-point reinforcement devices (5) on the three circumferential reinforcement devices (2) cover the cross-sectional circumference of the pipe.

3. The device for multi-point impact step-by-step strengthening of pipes according to claim 1, characterized in that: The supporting device (4) comprises two rollers (6) arranged in parallel, the two ends of the two rollers (6) being fixedly connected to the bed (1) via a mounting plate (7), the two rollers (6) being parallel to the end faces of the circumferential reinforcement device (2), and the opposite faces of the two rollers (6) being in contact with the outer surface of the pipe.

4. The device for multi-point impact step-by-step strengthening of pipes according to claim 3, characterized in that: The roller (6) is connected to a first motor (8).

5. A device for multi-point impact step-by-step strengthening of pipes according to any one of claims 1 to 4, characterized in that: The single-point strengthening device (5) comprises a housing, a second motor (9), a disc (10), a connecting rod (11), a cylinder (12), a first piston (13), a second piston (14), an impact rod (15) and a strengthening head (16); The second motor (9) and the disc (10) are arranged in the housing, and one end of the cylinder (12) is inserted into the housing and fixedly connected to the housing; The output end of the second motor (9) is connected to the center of the disk (10); One end of the connecting rod (11) is eccentrically connected to the disc (10), and the other end of the connecting rod (11) is connected to the first piston (13) in the cylinder body (12); The second piston (14) in the cylinder (12) is connected to one end of the impact rod (15); the other end of the impact rod (15) is connected to the strengthening head (16); The reinforcing head (16) is in contact with the surface of the pipe, and a plurality of the reinforcing heads (16) surround the circular hole to form the circular hole.

6. The device for multi-point impact step-by-step strengthening of pipes according to claim 5, characterized in that: The end surface of the disk (10) is provided with a plurality of connection points (17), the connection points (17) being used to connect the connecting rod (11), and the distances between the plurality of connection points (17) and the center of the disk (10) are different.

7. A method for multi-point impact step-by-step strengthening of pipes, characterized in that: The following steps are involved: Clamping one end of the pipe on the supporting device (4); activating a plurality of circumferential strengthening devices (2); The pipe is sequentially fed into a plurality of circumferential strengthening devices (2) through a supporting device (4), and is impacted by circumferentially distributed single-point strengthening devices (5) to achieve full strengthening of the pipe surface.

8. The method for multi-point impact step-by-step strengthening of pipes according to claim 7, characterized in that: The method of sequentially feeding the pipe into a plurality of circumferential strengthening devices (2) through the supporting device (4) comprises: The first motor (8) is started to drive the roller (6) to rotate, so that the roller (6) drives the pipe to be fed at a uniform speed.

9. The method for multi-point impact step-by-step strengthening of pipes according to claim 7, characterized in that: The single-point strengthening device (5) comprises a second motor (9), and the strengthening impact force is adjusted by adjusting the rotation speed of the second motor (9).

10. The method for multi-point impact step-by-step strengthening of pipes according to claim 9, characterized in that: The second motor (9) is connected to the connecting rod (11) via a disc, and the degree of surface strengthening of the pipe is adjusted by adjusting the connection position between the connecting rod (11) and the disc (10).

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