A pipe welding fixture

Abstract

A pipe welding fixture includes two core rods and a spreader. The core rods include a mating surface and a supporting surface. A recess is provided on the outer side of the core rods, the recess including a top wall and side walls. The core rods are provided with two blind holes, and the side walls are provided with two rows of through holes, one row of through holes communicating with one of the blind holes, and the other row of through holes communicating with the other blind hole. A heat conductor is embedded in the recess, the heat conductor including an inner side and an outer side, the inner side abutting the side wall, and the outer side flush with the core rod's supporting surface. The heat conductor includes multiple through holes, one opening of each of the multiple through holes corresponding one-to-one with and communicating with each other in one row of through holes, and another opening of each of the multiple through holes corresponding one-to-one with and communicating with each other in the other row of through holes. The top end of one of the blind holes is connected to a refrigerant output end of a cooling system, and the top end of the other blind hole is connected to a refrigerant return end of the cooling system. The present invention can prevent heat from being concentrated in a localized area of ​​the pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, in particular to a pipe welding fixture. Background Art

[0002] When welding a workpiece on the outside of a pipe or butt-welding a pipe, a fixture is usually required to position the pipe. Existing fixtures usually clamp and fix the pipe on the outside of the pipe. During the welding process, due to the thin wall thickness of the workpiece, the temperature at the weld is high, resulting in heat concentration, and the heat is difficult to dissipate quickly, which makes the weld prone to leaks, weld penetration, etc., resulting in the scrapping of the workpiece. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the object of the present invention is to provide a pipe welding fixture that can quickly dissipate the heat caused by welding, avoid heat concentration, and improve the yield rate of pipe welding.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A pipe welding fixture comprises two core rods arranged opposite to each other and inserted into the pipe, and a spreading piece placed between the two core rods for spreading the two core rods so that the two core rods move away from each other; the core rod comprises a mating surface located on its inner side and squeezed by the spreading piece, and a supporting surface located on its outer side, the supporting surface is arc-shaped and matches the inner wall of the pipe, a recess is provided on the outer side of the core rod, the recess comprises a top wall, and a side wall extending from the inner side of the top wall toward the lower end of the core rod; two blind holes extending downward from the top surface of the core rod are provided on the core rod, and two rows of through holes are opened on the side wall, each row of through holes is arranged along the height direction of the core rod, and one of the rows of through holes is connected to one of the blind holes, Another row of through holes are connected to another blind hole; a heat-conducting part fixedly connected to the core rod is embedded in the recess of each core rod, and the heat-conducting part includes an inner side surface and an outer side surface, the inner side surface is fitted to the side wall, and the outer side surface is flush with the support surface of the core rod, and a plurality of conducting holes arranged along the height direction of the core rod are provided in the heat-conducting part, and the two openings of the conducting holes are both located on the inner side surface, and one opening of the plurality of conducting holes corresponds one-to-one to one of the rows of through holes and are connected to each other, and the other opening of the plurality of conducting holes corresponds one-to-one to another row of through holes and are connected to each other; the top end of one of the blind holes is connected to the refrigerant output end of a cooling system, and the top end of the other blind hole is connected to the refrigerant return end of the cooling system.

[0006] The heat conducting member comprises a plurality of heat conducting copper blocks which are stacked and the conducting hole is located between two adjacent heat conducting copper blocks.

[0007] A groove is provided on the surfaces of the two adjacent heat-conducting copper blocks that are in contact with each other, and the grooves on the two adjacent heat-conducting copper blocks together form an installation groove. A guide tube is embedded in the installation groove, and the guide hole is located in the guide tube; the two ends of the guide tube are respectively inserted into two through holes in the two rows of through holes located at the same height.

[0008] A receiving groove is provided on the inner side surface of the heat-conducting copper block at the periphery of the groove. The receiving grooves on the two adjacent heat-conducting copper blocks form an annular groove located on the periphery of the guide tube. A sealing gasket is embedded in the annular groove and is clamped between the heat-conducting copper block and the side wall of the recess.

[0009] The groove is arc-shaped and extends along the outer edge of the heat-conducting copper block.

[0010] Each heat-conducting copper block is provided with a fixing hole, and a bolt hole is opened on the top wall of the recessed position and is opposite to the fixing hole. A fixing bolt passes through the fixing holes of multiple heat-conducting copper blocks from bottom to top and is then screwed into the bolt hole.

[0011] The mating surfaces of the two core rods are both provided with through grooves extending along the height direction of the new core rod. When the mating surfaces of the two core rods are in contact with each other, the through grooves on the two core rods together form a hole with an elliptical cross-section. The expansion member includes an expansion portion with an elliptical cross-section. The expansion portion is embedded in the hole, and the major axis of the ellipse of the expansion portion is greater than the minor axis of the ellipse of the hole.

[0012] One of the core rods is provided with a guide groove, and the other core rod is provided with an insert which is slidably embedded in the guide groove.

[0013] During welding, the heat generated by the pipe welding is transferred to the heat-conducting member, and the coolant is diverted to different positions of the heat-conducting member. By exchanging heat with the heat-conducting member at different positions, the coolant can quickly take out most of the heat generated by welding, thereby avoiding local concentration of heat in the pipe fitting and improving the welding yield of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 This is a schematic diagram of the installation of the present invention;

[0016] Figure 3 for Figure 2 Schematic diagram of the assembly of the heat conducting component;

[0017] Figure 4 for Figure 1 AA cross-sectional view. DETAILED DESCRIPTION

[0018] Below, in conjunction with the accompanying drawings and specific embodiments, the present invention is further described:

[0019] See also Figure 1 、 2, 3, and 4 show a pipe welding fixture of the present invention, which includes a core rod 10, a core rod 20, a support member 30, and two heat-conducting members 40, wherein the core rod 10 and the core rod 20 are arranged opposite to each other and inserted into the pipe 90, and the support member 30 is placed between the core rod 10 and the core rod 20. The support member 30 is used to push the core rod 10 and the core rod 20 in a direction away from each other, so that the assembly composed of the core rod 10 and the core rod 20 can expand to fit with the inner wall of the pipe 90. The structures of the core rod 10 and the core rod 20 are substantially the same. The structure of the core rod 10 is described below by taking the core rod 10 as an example. The core rod 10 includes a mating surface 102 located on its inner side and a supporting surface 101 located on its outer side, wherein the mating surface 102 is the surface squeezed by the stretching member 30, and the supporting surface 101 is the surface where the core rod 10 is pressed against the inner wall of the tube 30 and pressed against each other when being squeezed by the stretching member 30, thereby supporting the tube 30. Therefore, the supporting surface 101 is set to an arc shape and matches the shape of the inner wall of the tube 90, and the two sides of the supporting surface 101 are connected to the mating surface 102 by a bending structure respectively, and a surface extending upward from its bottom end surface is provided on the outer side of the core rod 10. The recess 11 extends outward, and the recess 11 includes a top wall 111 and a side wall 112 extending from the inner side of the top wall 111 along the height direction of the mandrel 10 to the bottom end surface of the mandrel 10; in addition, a blind hole 12 and a blind hole 13 are provided on the mandrel 10, and the blind hole 12 and the blind hole 13 both extend downward from the top surface of the mandrel 10 and form a blind end structure near the lower end surface of the mandrel 10. At the same time, the blind hole 12 and the blind hole 13 form an opening at the top of the mandrel 10, and the opening of the blind hole 12 is connected to the coolant output end of a cooling system through a hose 122, and the opening of the blind hole 13 is connected to the coolant return end of the cooling system through a hose 132. The core rod 10 is further provided with a row of through holes 121 and a row of through holes 131 arranged along the height direction thereof. The plurality of through holes 121 extend from the side wall 112 of the recess 11 to the blind hole 12, while the plurality of through holes 131 extend from the side wall 112 of the recess 11 to the blind hole 13. That is, the plurality of through holes 121 are connected to the blind hole 12 at different heights, and the plurality of through holes 131 are connected to the blind hole 13 at different heights.The two heat conductors 40 are respectively embedded in the recesses of the core rod 10 and the core rod 20. The heat conductor 40 that cooperates with the core rod 10 is taken as an example to illustrate, wherein the heat conductor 40 is embedded in the recess 11, and the heat conductor 40 is fixedly connected to the core rod 10. The heat conductor 40 includes an inner side surface and an outer side surface, wherein the inner side surface is in contact with the side wall 112 of the recess 11, and the outer side surface is flush with the support surface of the core rod 10. It can be regarded as that the shape and size of the heat conductor 40 are equivalent to those of the recess 11. After the heat conductor 40 is filled in the recess 11, the heat conductor 40 and the core rod 10 form a component, and the shape and size of any cross section of the component are the same. In this way, the outer side surface of the heat conductor 40 can also squeeze the inner wall of the tube 90 and press it against the inner wall of the tube 90 when the core rod 10 moves horizontally to support the tube. A plurality of conducting holes are arranged in the height direction of the core rod 10 inside the heat conducting member 40. Both openings of the conducting holes are located on the inner side of the heat conducting member 40, and the plurality of conducting holes correspond to the plurality of through holes 121 and the plurality of through holes 131. After the heat conducting member 40 and the core rod 10 are fixed in place, one of the openings of the conducting hole is connected to the through hole 121 that matches the conducting hole, and the other opening is connected to the through hole 131 that matches the conducting hole. In other words, the two openings of the conducting hole are respectively connected to the through hole 121 and the through hole 131 located at the same height. In this way, the hose 122, the blind hole 12, the through hole 121, the conducting hole, and the through hole 131 , blind hole 13, hose 132 and cooling system form a circuit for circulating coolant in the cooling system. The multiple conducting holes provided on the heat conductor 40 cooperate with the multiple through holes 121 and through holes 131 to form multiple parallel passages between the blind holes 12 and the blind holes 13. After the coolant flows out of the cooling system, it flows through the blind hole 12 and then is diverted to different conducting holes through the multiple through holes 121. Since the multiple conducting holes are respectively located at different heights of the heat conductor 40, the coolant can exchange heat with the heat conductor 40 at different positions of the heat conductor 40. The coolant after heat exchange flows back to the cooling system through the through holes 131 and blind holes 13.

[0020] During welding, the present invention places the core rod 10 and the core rod 20 in the pipe 90, and uses the expansion member 30 to expand the core rod 10 and the core rod 20 so that the core rod 10 and the core rod 20 support and press the inner wall of the pipe 90. The heat conducting member 40 on the core rod 10 and the core rod 20 is placed on the inner side of the welding part of the pipe 90. During welding, the heat generated by the welding of the pipe 90 is transferred to the heat conducting member 40, and the coolant is diverted to different positions of the heat conducting member 40. By exchanging heat with the heat conducting member 40 at different positions, the coolant can quickly take out most of the heat generated by welding, thereby avoiding the local concentration of heat in the pipe 90 and improving the welding yield of the parts.

[0021] In a preferred embodiment, the heat conducting member 40 of the present invention includes a plurality of heat conducting copper blocks 41, which are stacked and arranged along the height direction of the core rod 10, and the conductive hole is arranged between two adjacent heat conducting copper blocks 41. Since the two openings of the conductive hole are both located on the inner side of the heat conducting member 40, that is, the two openings of the conductive hole are located in the same plane, the conductive hole must be arranged into a curved structure. Since the conductive hole is arranged between the two heat conducting copper blocks 41, the conductive hole can be processed on the surface of the heat conducting copper block 41, thereby simplifying the processing process of the heat conducting member 40. Furthermore, a groove 413 is provided on the mutually contacting surfaces of the two adjacent heat-conducting copper blocks 41, and both ends of the groove 413 are located on the inner side surface 411 of the heat-conducting copper block 41, and the grooves 413 on the two adjacent heat-conducting copper blocks 41 together form a mounting groove, which can be used to constitute the above-mentioned conductive hole. Of course, in order to facilitate sealing, in the present invention, a guide tube 42 is embedded in the mounting groove, and the extension direction of the guide tube 42 is consistent with the extension direction of the groove 413. The two ends of the guide tube 42 are respectively passed through the two openings of the mounting groove, that is, both ends of the guide tube 42 protrude from the inner side surface 411, and one end of the guide tube 42 is connected to the through hole 121 and is conductive with the through hole 12, and the other end is connected to the through hole 131 and is conductive with the through hole 131, and the above-mentioned conductive hole is formed inside the guide tube 42.

[0022] In addition, a receiving groove 414 is provided on the inner side surface of the heat-conducting copper block 41 at the periphery of the groove 413. After the two adjacent heat-conducting copper blocks 41 are stacked, the receiving grooves 414 on the two heat-conducting copper blocks 41 form an annular groove located on the periphery of the flow guide tube 42. A sealing gasket 44 is embedded in the annular groove. After the heat-conducting member 40 and the core rod 10 are fixed, the sealing ring 44 is clamped between the heat-conducting copper block 41 and the side wall 112 of the recess 11. In this way, the position components of the flow guide tube 42 and the through holes 121 and 131 can be sealed to prevent leakage of the coolant.

[0023] In other preferred embodiments of the present invention, the groove 413 is arc-shaped and its shape is larger than and consistent with the shape of the outer surface of the thermally conductive copper block 41, and the groove 413 extends along the outer edge of the thermally conductive copper block 41 and is arranged as close to the outer edge of the thermally conductive copper block 41 as possible, so that the guide tube 42 can be as close as possible to the outer surface of the thermally conductive copper block 41, and then close to the inner wall of the pipe 90 during welding.

[0024] In addition, a fixing hole 415 is provided on each heat-conducting copper block 41, and a bolt hole is provided on the top wall 111 of the recess 11, which is opposite to the fixing hole 415. After a fixing bolt 43 passes through the fixing holes 415 of multiple heat-conducting copper blocks 41 from bottom to top, the fixing bolt 43 is screwed into the bolt hole. By tightening the fixing bolt 43, the multiple heat-conducting copper blocks 41 can be fixed together, and at the same time, the heat-conducting part 40 composed of multiple heat-conducting copper blocks 41 can be fixed on the core rod 10.

[0025] A through groove 103 extending from the upper end face to the lower end face of the mandrel 10 is provided on the mating surface 102 of the mandrel 10, and a through groove 203 is also provided on the mating surface of the mandrel 20. When the mating surfaces of the mandrel 10 and the mandrel 20 are fitted together, the through groove 103 on the mandrel 10 and the through groove 203 on the mandrel 20 together form a hole, the cross section of which is elliptical. The main body of the above-mentioned expansion member 30 is a columnar expansion portion 31, which is embedded in the combination of the through groove 102 and the through groove 203. The cross-sectional shape of the expansion portion 31 is also elliptical, and the major axis of the ellipse of the expansion portion 31 is larger than the minor axis of the hole ellipse. In this way, when the expansion portion 31 is rotated by using the handle 32 on the expansion member 30, the expansion portion 31 will squeeze the core rod 10 and the core rod 20, so that the core rod 10 and the core rod 20 move away from each other, and the supporting surfaces of the core rod 10 and the core rod 20 squeeze the pipe fitting. At the same time, the outer side surface of the heat conducting member 40 on the two is attached to and pressed against the inner side of the welding point of the pipe fitting 90.

[0026] The structure of mandrel 20 is substantially the same as that of mandrel 10, and the mating structure of mandrel 20 and heat conductor 40 is the same as described above, so a repeated description is not given here. The difference between mandrel 10 and mandrel 20 is that mandrel 20 is provided with a guide groove 204, while mandrel 10 is provided with an insert 104. Insert 104 is slidably embedded in guide groove 204, allowing mandrel 10 and mandrel 20 to slide together and prevent displacement during relative movement.

[0027] The foregoing description is merely a preferred embodiment of the present invention, further illustrating the present invention in conjunction with specific preferred embodiments. The specific implementation of the present invention should not be considered to be limited to these descriptions. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pipe welding fixture, characterized in that: The cam is secured to the side of the tube with a secure fit and securely fastened to the side panel that is provided with the support rail, and the cam has a lockhole that is provided on each of the sides of the tube and a lockhole that is provided on the side panel that is provided with a check valve in said cam. The component is provided with a plurality of conducting holes arranged along the height direction of the core rod, and the two openings of the conducting holes are both located on the inner side surface, and one opening of the plurality of conducting holes corresponds one-to-one to one of the through holes in one column and are interconnected, and the other opening of the plurality of conducting holes corresponds one-to-one to another column of through holes and are interconnected; the top end of one blind hole is connected to the refrigerant output end of a cooling system, and the top end of the other blind hole is connected to the refrigerant return end of the cooling system; the heat-conducting component includes a plurality of heat-conducting copper blocks, which are stacked, and the conducting hole is located between two adjacent heat-conducting copper blocks; the mating surfaces of the two core rods are provided with through grooves extending along the height direction of the new core rod, and when the mating surfaces of the two core rods are in contact with each other, the through grooves on the two core rods together form a hole with an elliptical cross section, and the support component includes a support part with an elliptical cross section, the support part is embedded in the hole, and the major axis of the ellipse of the support part is larger than the minor axis of the ellipse of the hole.

2. The pipe welding fixture according to claim 1, characterized in that: A groove is provided on the surfaces of the two adjacent heat-conducting copper blocks that are in contact with each other, and the grooves on the two adjacent heat-conducting copper blocks together form an installation groove. A guide tube is embedded in the installation groove, and the guide hole is located in the guide tube; the two ends of the guide tube are respectively inserted into two through holes in the two rows of through holes located at the same height.

3. The pipe welding fixture according to claim 2, characterized in that: A receiving groove is provided on the inner side surface of the heat-conducting copper block at the periphery of the groove. The receiving grooves on the two adjacent heat-conducting copper blocks form an annular groove located on the periphery of the guide tube. A sealing gasket is embedded in the annular groove and is clamped between the heat-conducting copper block and the side wall of the recess.

4. The pipe welding fixture according to claim 3, characterized in that: The groove is arc-shaped and extends along the outer edge of the heat-conducting copper block.

5. The pipe welding fixture according to claim 1, characterized in that: Each heat-conducting copper block is provided with a fixing hole, and a bolt hole is opened on the top wall of the recessed position and is opposite to the fixing hole. A fixing bolt passes through the fixing holes of multiple heat-conducting copper blocks from bottom to top and is then screwed into the bolt hole.

6. The pipe welding fixture according to claim 1, characterized in that: One of the core rods is provided with a guide groove, and the other core rod is provided with an insert which is slidably embedded in the guide groove.

Images