Radial positioning device

Abstract

The utility model discloses a radial positioning device which comprises a pipe sleeve, a spring core rod is arranged in the pipe sleeve, tensioning seats are arranged at the two ends of the spring core rod in a sliding mode, belleville springs are filled on the periphery of the spring core rod between the tensioning seats arranged at the two ends of the spring core rod, and a plurality of steel balls are evenly arranged between the tensioning seats and the pipe sleeve. According to the device, elastic force applied to the steel balls by the belleville springs enables the steel balls to extend out of the pipe sleeves and then apply uniform external force to the to-be-welded pipe fitting, so that the to-be-welded pipe fitting and the welding hole site on the plate are concentric.

Description

Technical Field

[0001] The utility model relates to auxiliary tooling in the welding field, in particular to a radial positioning device. Background Art

[0002] When welding equipment for tube-sheet structures, it is necessary to insert the pipe fitting into the welding position of the plate, and then use a deep hole welding gun to insert into the welding point of the tube sheet for welding. During the welding process, it is necessary to perform concentric operation on the pipe fitting and the welding hole on the plate to prevent uneven weld appearance and poor welding quality due to non-concentricity during the welding process. Traditional equipment uses a radial positioning device concentric with the pipe fitting to extend into the pipe fitting, and inserts the steel ball inside the radial positioning device by rotating bolts and other operations, connects with the inner wall of the pipe fitting, and presses against the inner wall of the pipe fitting, thereby completing the concentric operation of the pipe fitting and the welding hole on the plate. However, such equipment structure has the following problems:

[0003] Traditional equipment only has steel balls at the ends, and it is impossible to achieve concentricity between the two ends of the pipe fitting and the welding holes on the plate at the same time. At the same time, traditional equipment is easily affected by the thermal expansion and contraction of materials during welding, which causes the equipment to be stuck in the pipe fitting after welding and cannot be removed smoothly.

[0004] In view of these problems, this application proposes a solution. Summary of the invention

[0005] Purpose of the utility model: The purpose of the utility model is to provide a radial positioning device, which is easy to use and can complete the function of center positioning for the pipe to be welded, prevent the uneven appearance of the weld caused by the non-concentricity of the welding holes between the pipe and the plate during welding, and improve the welding quality.

[0006] Technical solution: The radial positioning device described in the utility model includes a tube sleeve, a spring core rod is arranged inside the tube sleeve, and tensioning seats are slidably arranged at both ends of the spring core rod. The outer periphery of the spring core rod between the tensioning seats arranged at both ends of the spring core rod is filled with a butterfly spring, and a plurality of steel balls are evenly arranged between the tensioning seats and the tube sleeve, and an opening through which the steel ball extends is provided on the tube sleeve corresponding to any of the steel balls.

[0007] Preferably, the tensioning seat comprises a circular tube segment 1, a truncated cone segment and a circular tube segment 2, wherein the circular tube segment 1, the truncated cone segment and the circular tube segment 2 are concentrically connected in sequence from near the center of the sleeve toward the opening direction of the sleeve, a spring core rod is passed through the centers of the circular tube segment 1, the truncated cone segment and the cylindrical segment 2, a butterfly spring is filled between the inner wall of the circular tube segment 1 and the outer wall of the spring core rod, the outer wall of the circular tube segment 1 is fitted with the inner wall of the sleeve and is slidably connected, and the truncated cone segment and the circular tube segment 2 follow the displacement of the circular tube segment 1.

[0008] The setting of the three-stage tensioning seat completes the positioning of the spring core rod and the butterfly spring, and at the same time makes the butterfly spring have elastic force on the tensioning seat, which can push the tensioning seat to slide and move along the pipe sleeve.

[0009] Preferably, the outer diameter of the first circular tube segment is the same as the outer diameter of the end surface of the truncated cone segment facing the center of the sleeve, and the outer diameter of the end surface of the truncated cone segment facing the opening of the sleeve is the same as the outer diameter of the second circular tube segment.

[0010] Preferably, the outer wall of the truncated cone section supports the steel ball to expand and contract in the opening on the pipe sleeve, and the radius of the opening is smaller than the radius of the steel ball.

[0011] The radius of the opening being smaller than the steel ball ensures that the steel ball can extend out of the opening without completely protruding out of the opening and falling out of the opening.

[0012] Preferably, half of the difference between the outer diameter of the circular tube segment 2 and the inner diameter of the tube sleeve is the same as the diameter of the steel ball.

[0013] Half of the difference between the outer diameter of the second circular tube segment and the inner diameter of the sleeve is the same as the diameter of the steel ball, which can ensure that when the steel ball is completely retracted into the sleeve, it is limited by the wall of the sleeve and stays at the radial position corresponding to the opening on the sleeve.

[0014] Preferably, a fixing seat and a connecting seat are respectively provided at both ends of the pipe sleeve, the outer wall of the fixing seat is fixedly connected to the inner wall of the pipe sleeve to seal the opening at one end of the pipe sleeve, the outer wall of one end of the connecting seat is fixedly connected to the inner wall of the pipe sleeve, and the other end is connected to the welding gun assembly.

[0015] The setting of the fixing seat and the connecting seat completes the axial limitation of the tensioning seat in the pipe sleeve, and the setting of the connecting seat completes the connection setting with the external welding gun.

[0016] Preferably, a cavity one is provided inside the fixing seat for the tensioning seat to move axially along the pipe sleeve, and the inner diameter of the cavity one is consistent with the outer diameter of the end of the tensioning seat on the side of the pipe sleeve opening; and a cavity two is provided inside the connecting seat for the tensioning seat to move axially along the pipe sleeve, and the inner diameter of the cavity two is consistent with the outer diameter of the end of the tensioning seat on the side of the pipe sleeve opening.

[0017] The provision of cavity one and cavity two facilitates the fixing seat and the connecting seat to limit the tension seat while allowing the tension seat to move along the axial direction of the pipe sleeve under the elastic force of the disc spring.

[0018] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0019] The present application uses the elastic force of the butterfly spring to push the steel ball out of the opening, thereby completing the concentric operation of the welding holes of the pipe fitting and the plate during the welding process of the pipe fitting and the plate. At the same time, since the present application uses the elastic force of the butterfly spring to complete the ejection of the steel ball, compared with traditional equipment that uses threads to adjust the ejection distance of the steel ball, it is easier to remove after welding is completed and will not get stuck in the pipe fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the utility model.

[0021] Figure 2 It is a front sectional view of the utility model.

[0022] Figure 3 This is a working state diagram of the utility model when it is placed in a pipe fitting.

[0023] Among them: 1. pipe sleeve; 2. spring core rod; 3. tension seat; 4. disc spring; 5. steel ball; 6. opening; 7. fixing seat; 8. connecting seat; 9. pipe fitting; 31. round pipe section 1; 32. frustum section; 33. round pipe section 2; 71. cavity 1; 81. cavity 2. DETAILED DESCRIPTION

[0024] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0025] See attached Figures 1 to 3 , the radial positioning device shown in the utility model comprises a sleeve 1, a spring core rod 2 is arranged inside the sleeve 1, tensioning seats 3 are slidably arranged at both ends of the spring core rod 2, a butterfly spring 4 is filled on the outer circumference of the spring core rod 2 between the tensioning seats 3 arranged at both ends of the spring core rod 2, a plurality of steel balls 5 are evenly arranged between the tensioning seats 3 and the sleeve 1, and an opening 6 through which the steel ball 5 extends is arranged on the sleeve 1 corresponding to any steel ball 5.

[0026] In this embodiment, the tensioning seat 3 includes a circular tube segment 1 31, a truncated cone segment 32 and a circular tube segment 2 33. The circular tube segment 1 31, the truncated cone segment 32 and the circular tube segment 2 33 are concentrically connected in sequence from the center of the pipe sleeve 1 to the opening direction of the pipe sleeve 1. A spring core rod 2 is passed through the center of the circular tube segment 1 31, the truncated cone segment 32 and the cylindrical segment 2 33. At the same time, a butterfly spring 4 is filled between the inner wall of the circular tube segment 1 31 and the outer wall of the spring core rod 2. The outer wall of the circular tube segment 1 31 fits with the inner wall of the pipe sleeve 1. Under the elastic force of the butterfly spring 4, the circular tube segment 1 31 is slidably connected to the pipe sleeve 1, and at the same time, the truncated cone segment 32 and the circular tube segment 2 33 follow the displacement of the circular tube segment 1 31.

[0027] The three-stage tensioning seat 3 is provided to position the spring core rod 2 and the butterfly spring 4 , and at the same time, the butterfly spring 4 has elastic force on the tensioning seat 3 , which can push the tensioning seat 3 to slide and move along the pipe sleeve 1 .

[0028] In this embodiment, the outer diameter of the first circular tube segment 31 is the same as the outer diameter of the end surface of the truncated cone segment 32 facing the center of the sleeve 1 , and the outer diameter of the end surface of the truncated cone segment 32 facing the opening of the sleeve 1 is the same as the outer diameter of the second circular tube segment 33 .

[0029] In this embodiment, the outer wall of the truncated cone section 32 supports the steel ball 5 to extend and retract in the opening 6 on the pipe sleeve 1. The radius of the opening 6 is smaller than the radius of the steel ball 5. This arrangement can ensure that the steel ball 5 can extend out of the opening 6 while not completely protruding out of the opening 6 and falling from the opening 6.

[0030] In this embodiment, half of the difference between the outer diameter of the second circular tube segment 33 and the inner diameter of the tube sleeve 1 is the same as the diameter of the steel ball 5. This arrangement can ensure that when the steel ball 5 is completely retracted into the tube sleeve 1, it is limited by the wall of the tube sleeve 1 and stays at the radial position corresponding to the opening 6 on the tube sleeve 1.

[0031] In this embodiment, a fixing seat 7 and a connecting seat 8 are respectively provided at both ends of the pipe sleeve 1. The outer wall of the fixing seat 7 is fixedly connected to the inner wall of the pipe sleeve 1 to seal the opening at one end of the pipe sleeve 1. The outer wall of one end of the connecting seat 8 is fixedly connected to the inner wall of the pipe sleeve 1, and the other end is connected to the welding gun assembly. The setting of the fixing seat 7 and the connecting seat 8 completes the axial limitation of the tensioning seat 3 in the pipe sleeve 1, and the setting of the connecting seat 8 completes the connection setting with the external welding gun.

[0032] In this embodiment, a cavity 71 is provided inside the fixed seat 7 for the tension seat 3 to move axially along the pipe sleeve 1, and the inner diameter of the cavity 71 is consistent with the outer diameter of the end of the tension seat 3 facing the opening side of the pipe sleeve 1; a cavity 2 81 is provided inside the connecting seat 8 for the tension seat 3 to move axially along the pipe sleeve 1, and the inner diameter of the cavity 2 81 is consistent with the outer diameter of the end of the tension seat 3 facing the opening side of the pipe sleeve 1. The setting of the cavity 1 71 and the cavity 2 81 facilitates the fixed seat 7 and the connecting seat 8 to limit the tension seat 3 while allowing the tension seat 3 to move axially along the pipe sleeve 1 under the elastic force of the disc spring 4.

[0033] When the present application is in use, under the outward elastic force of the butterfly spring 4 on the tension seat 3, the outer wall of the truncated cone section 32 pushes the steel ball 5 out of the pipe sleeve 1. Due to the influence that the radius of the opening 6 is smaller than the radius of the steel ball 5, the steel ball 5 extends out of the pipe sleeve 1 without falling. At this time, after the pipe 9 to be welded is inserted into the welding hole on the plate, the welding gun assembly is inserted into one end of the pipe 9, the welding gun head is facing the welding hole on the plate, and the radial positioning device is inserted into the pipe 9 at the other end of the pipe 9 until the connecting seat 8 is connected to the welding gun assembly. At this time, the radial positioning device is evenly distributed between the tension seat 3 and the pipe. The steel balls 5 between the sleeves 1 are contracted into the sleeve 1 by the pressure from the inner wall of the pipe fitting 9. Since the steel balls 5 with the same outward extending force are evenly arranged at both ends of the radial positioning device, the inner wall of the pipe fitting 9 is subjected to a uniform radial force, and the pipe fitting 9 and the welding hole on the plate complete a concentric operation. At this time, the welding gun performs welding. After welding, since the steel balls 5 extend out of the opening 6 by the elastic force of the disc spring 4, the radial positioning device will not be stuck in the pipe fitting 9 due to the influence of thermal expansion and contraction of the pipe fitting 9 and the sleeve 1, and can be removed smoothly.

[0034] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A radial positioning device, comprising a sleeve, characterized in that: A spring core rod is arranged inside the tube sleeve, and tension seats are slidably arranged at both ends of the spring core rod. The outer circumference of the spring core rod between the tension seats arranged at both ends of the spring core rod is filled with a butterfly spring, and a plurality of steel balls are evenly arranged between the tension seats and the tube sleeve, and an opening through which the steel ball extends is arranged on the tube sleeve corresponding to any of the steel balls.

2. A radial positioning device according to claim 1, characterized in that: The tensioning seat includes a circular tube segment 1, a truncated cone segment and a circular tube segment 2, which are concentrically connected in sequence from the center of the pipe sleeve to the opening direction of the pipe sleeve. A spring core rod is passed through the centers of the circular tube segment 1, the truncated cone segment and the cylindrical segment 2. A butterfly spring is filled between the inner wall of the circular tube segment 1 and the outer wall of the spring core rod. The outer wall of the circular tube segment 1 fits with the inner wall of the pipe sleeve and is slidably connected. The truncated cone segment and the circular tube segment 2 follow the displacement of the circular tube segment 1.

3. A radial positioning device according to claim 2, characterized in that: The outer diameter of the first circular tube segment is the same as the outer diameter of the end surface of the truncated cone segment facing the center of the sleeve, and the outer diameter of the end surface of the truncated cone segment facing the opening of the sleeve is the same as the outer diameter of the second circular tube segment.

4. A radial positioning device according to claim 2, characterized in that: The outer wall of the truncated cone section supports the steel ball to expand and contract in the opening on the pipe sleeve, and the radius of the opening is smaller than the radius of the steel ball.

5. A radial positioning device according to claim 2, characterized in that: Half of the difference between the outer diameter of the second circular tube section and the inner diameter of the tube sleeve is the same as the diameter of the steel ball.

6. A radial positioning device according to claim 1, characterized in that: A fixing seat and a connecting seat are respectively provided at both ends of the pipe sleeve. The outer wall of the fixing seat is fixedly connected to the inner wall of the pipe sleeve to seal the opening at one end of the pipe sleeve. The outer wall of one end of the connecting seat is fixedly connected to the inner wall of the pipe sleeve, and the other end is connected to the welding gun assembly.

7. A radial positioning device according to claim 6, characterized in that: The fixing seat is provided with a cavity 1 inside for the tensioning seat to move axially along the pipe sleeve, and the inner diameter of the cavity 1 is consistent with the outer diameter of the end of the tensioning seat on the side of the pipe sleeve opening. The connecting seat is provided with a cavity 2 inside for the tensioning seat to move axially along the pipe sleeve, and the inner diameter of the cavity 2 is consistent with the outer diameter of the end of the tensioning seat on the side of the pipe sleeve opening.

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