Tunnel pipe forming device and calibration method thereof

Abstract

The invention relates to the technical field of tunnel pipe forming, in particular to a tunnel pipe forming device and a calibration method thereof. The device comprises a supporting mechanism, a forming device body and a lubricating mechanism, the forming device body is detachably installed at the top end of the supporting mechanism, and the forming device body is of a hollow cylindrical structure; a plurality of lubricating mechanisms are detachably mounted on the former body, and one end of each lubricating mechanism protrudes out of the inner wall of the cylindrical structure of the former body; the interior of the cylindrical structure of the former body is used for containing and forming a workpiece, and in the workpiece forming process of the former body, the end, protruding out of the inner wall of the cylindrical structure of the former body, of the lubricating mechanism is in sliding fit with the outer wall of the workpiece in the cylindrical structure of the former body. Abrasion of a workpiece to the inner wall of the former body can be greatly reduced, friction force between the workpiece and the inner wall of the former body can also be reduced, the production efficiency is improved, and the driving cost is reduced.

Description

[0001] Cross-references to related applications This application is a divisional application of the invention entitled “A Tunnel Tube Forming Device and Calibration Method Thereof”, filed on March 4, 2025, with application number “CN202510251235.6”, which is incorporated herein by reference in its entirety. Technical Field

[0002] This invention relates to the field of tunnel tube forming technology, and in particular to a device for tunnel tube forming and its calibration method. Background Technology

[0003] A rocket tunnel tube is a testing device used to simulate the working environment of a rocket engine. It can generate high temperature, high pressure and high speed airflow under controlled conditions to verify the engine's performance and reliability.

[0004] The manufacturing of rocket tunnel tubes is inseparable from their welding equipment. This equipment is used specifically for manufacturing rocket tunnel tubes. Existing rocket tunnel tube welding equipment mainly consists of a control system, a gas protection device, a welding system, a dust removal fan, and a forming device. Among these, the forming device is a key component, ensuring precise forming and dimensional control of the tube (workpiece) during the welding process. During welding, the tube enters the forming device and fits tightly against its inner wall, forming a pipe within the device. The forming device also ensures the diameter accuracy of the formed pipe, thereby guaranteeing a good fit between the seams of the two pipes to be welded in subsequent welding processes, meeting the requirements of subsequent welding.

[0005] However, several problems still exist when using large-diameter, thin-walled tubing for spiral forming within the forming unit. First, large-diameter tubing is typically made of high-strength stainless steel, which has considerable hardness. When tightly fitted against the inner wall of the forming unit, it causes significant wear, compromising the dimensional accuracy and surface quality of the product. Second, the tight fit of the tubing against the inner wall creates sliding friction, which generates substantial resistance. This increases the driving force required to move the tubing within the forming unit, reducing production efficiency and driving costs.

[0006] Currently, to address these issues, lubricant is typically added to the inner wall of the forming machine to reduce wear and friction between the pipe and the forming machine's inner wall. However, this method is not ideal, as the lubricant contains many impurities. When the pipe enters the forming machine, its surface and weld seams become contaminated with this impurity-laden lubricant. Before subsequent welding, the lubricant on the pipe surface and at the weld seams needs to be removed, thus reducing production efficiency and increasing additional labor costs.

[0007] Therefore, how to reduce the wear of the inner wall of the former, and also reduce the friction between the pipe and the inner wall of the former, thereby improving the production efficiency and reducing the driving cost, has become a problem to be solved. SUMMARY

[0008] The application aims to provide a tunnel pipe forming device and a calibration method thereof to solve the problems of the prior art.

[0009] To achieve the above-mentioned purpose, the application provides the following solutions. In a first aspect, the application provides a tunnel pipe forming device, comprising a supporting mechanism, a former body and a lubricating mechanism, wherein: The former body is detachably installed at the top end of the supporting mechanism, and the former body is a hollow cylindrical structure. A plurality of lubricating mechanisms are detachably installed on the former body, and one end of the lubricating mechanism protrudes from the inner wall of the cylindrical structure of the former body. The cylindrical structure of the former body is used to accommodate and form a workpiece, and during the forming of the workpiece, one end of the lubricating mechanism protruding from the inner wall of the cylindrical structure of the former body is in sliding cooperation with the outer wall of the workpiece in the cylindrical structure of the former body.

[0010] According to an embodiment of the application, the former body is a spiral structure.

[0011] According to an embodiment of the application, the supporting mechanism comprises a base and a supporting leg, the supporting leg is detachably installed at the top end of the base, and the former body is detachably installed at the top end of the supporting leg.

[0012] According to an embodiment of the application, a pad is installed at the top end of the base, the pad is correspondingly arranged at the entrance of the former body, and the thickness of the pad is the same as the wall thickness at the entrance of the former body.

[0013] According to an embodiment of the application, the lubricating mechanism comprises a ball, a plurality of mounting holes are formed on the former body, a plurality of balls are respectively limitedly installed in the mounting holes, and the ball and the mounting hole are in sliding connection; one end of the ball away from the mounting hole is protruded from the inner wall of the cylindrical structure of the former body and is in sliding cooperation with the outer wall of the workpiece.

[0014] According to one embodiment of the present application, the lubricating mechanism further comprises mounting blocks, a plurality of the mounting blocks are respectively detachably mounted in a plurality of the mounting holes; the ball is slidingly mounted on the mounting block, and the ball is slidingly connected with the mounting block, and the ball is connected with the mounting hole through the mounting block.

[0015] According to one embodiment of the present application, the tunnel pipe forming device further comprises a calibration cylinder, the calibration cylinder is used for calibrating the lubricating mechanism on the former body; the calibration cylinder is a hollow structure and is located in the cylindrical structure of the former body, and the calibration cylinder is used for being coaxially arranged with the former body and being in clearance fit with the inner wall of the former body; a plurality of calibration mechanisms are arranged on the calibration cylinder in the circumferential direction, and the calibration mechanisms are located at one end of the outside of the calibration cylinder and are used for abutting against the inner wall of the former body.

[0016] According to one embodiment of the present application, the calibration mechanism comprises a calibration groove opened on the outer wall of the calibration cylinder, a calibration hole is opened in the calibration groove, and a calibration bolt is threadedly mounted in the calibration hole; when the calibration cylinder calibrates the lubricating mechanism on the former body, one end of the calibration bolt located at the outside of the calibration cylinder abuts against the inner wall of the former body.

[0017] According to one embodiment of the present application, a plurality of hoisting holes are opened at one end of the calibration cylinder.

[0018] The second aspect of the present application also provides a calibration method of a tunnel pipe forming device, comprising the steps of calibrating the tunnel pipe forming device, which comprises: S1, vertically placing the former body; S2, hoisting the calibration cylinder into the cylindrical structure of the former body; S3, adjusting the calibration cylinder and the former body to be coaxial; S4, mounting the calibration bolt in the calibration hole from the inside of the calibration cylinder until the calibration bolt located at one end of the outside of the calibration cylinder contacts the inner wall of the former body; S5, mounting the mounting block in the mounting hole from the outside of the former body until the ball on the mounting block contacts the outer wall of the calibration cylinder; S6, hoisting the calibration cylinder out of the cylindrical structure of the former body.

[0019] The present application has at least the following technical effects: The application provides a device for forming a tunnel pipe and a calibration method thereof. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present application. Figure 2 It is a schematic diagram of the overall structure of the present application. Figure 1 It is a partial enlarged view of A in the figure. Figure 3 It is a schematic diagram of the overall structure of the present application. Figure 1 It is a schematic diagram of the overall structure of the present application. Figure 4 It is a schematic diagram of the overall structure of the present application. Figure 5 It is a partial enlarged view of B in the figure. Figure 4 Figure 6 It is a schematic diagram of the overall structure of the present application. Figure 4 It is a partial enlarged view of C in the figure. Figure 7 Figure 6 It is a schematic diagram of the overall structure of the present application. Figure 8 It is a schematic diagram of the overall structure of the present application. Figure 9 It is a schematic diagram of the overall structure of the present application. Figure 10 It is a schematic diagram of the overall structure of the present application. Figure 11 It is a schematic diagram of the overall structure of the present application. Figure 12 It is a schematic diagram of the overall structure of the present application. ​​Wherein, 1, base; 2, support leg; 3, former body; 4, cushion block; 5, front protective gas device connecting block; 6, welding gun connecting block; 7, back protective gas device connecting block; 8, calibration cylinder; 9, hoisting hole; 10, calibration groove; 11, mounting block; 12, ball; 13, workpiece; 14, calibration bolt. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be given below in combination with specific embodiments and drawings. It should be understood that the specific embodiments described herein are only configured to explain the present application and to illustrate the principles of the present application, and are not configured to limit the present application. In addition, the structural elements in the drawings are not necessarily drawn to scale. For example, the size of some structural elements in the drawings can be enlarged for other structural elements or regions to help understand the embodiments of the present application.

[0023] The orientation words appearing in the following description are the directions shown in the drawings, and are not limited to the specific structure of the embodiments of the present application. In the description of the present application, it should be noted that, unless otherwise specified, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] In addition, the terms "include", "contain", "have" or any other variant thereof are intended to cover non-exclusive inclusion, so that the inclusion of a series of element structures or components not only includes those elements, but also includes other elements not explicitly listed or inherent in the structure, component. Without more limitation, the elements defined by the statement "include" do not exclude the presence of other identical elements in the article or device including the elements.

[0025] Spatial relationship terms such as "below", "under", "under", "low", "above", "on", "high" and the like are used to facilitate description and to explain the position of one element relative to the second element, indicating that these terms are intended to cover different orientations of the device except for those shown in the drawings. In addition, for example, "one element is on / under another element" can mean that the two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first", "second" and the like are also used to describe various elements, regions, parts and the like, and are not intended to specifically refer to order or sequence, and should not be considered as limiting. Similar terms are used throughout the description to represent similar elements.

[0026] The application can be implemented by those skilled in the art without some of the specific details. The following description of the embodiments is only to provide a better understanding of the application by showing examples of the application.

[0027] Embodiment 1 The application provides a tunnel pipe forming device, comprising a supporting mechanism, a former body 3 and a lubricating mechanism, wherein: The former body 3 is detachably installed at the top end of the supporting mechanism, and the former body 3 is a hollow cylindrical structure; wherein the former body 3 can preferably be a spiral structure, the inner wall size precision of the former body 3 can be ±0.1mm, the shape precision can be 0.02mm, and the straightness can be 0.01mm.

[0028] In this embodiment, referring to Figure 1 or Figure 3 , the former body 3 can be detachably installed at the top end of the supporting mechanism by means known to those skilled in the art, such as by bolt connection.

[0029] A plurality of lubricating mechanisms are detachably installed on the former body 3, and one end of the lubricating mechanism is located at least in the cylindrical structure of the former body 3, that is, at least one end of the lubricating mechanism is located inside the cylindrical structure of the former body 3 (i.e. protruding from the inner wall of the former body 3) to realize relative sliding fit with the outer wall of the workpiece 13 and produce lubricating effect on the workpiece 13.

[0030] Referring to Figure 8 , the cylindrical structure of the former body 3 is used to accommodate and form the workpiece 13, and during the forming of the workpiece 13, the end of the lubricating mechanism located in the cylindrical structure of the former body 3 (i.e. the end of the lubricating mechanism protruding from the inner wall of the former body 3) realizes sliding fit with the outer wall of the workpiece 13 in the cylindrical structure of the former body 3. The former body 3 can be used to form the workpiece 13 into a tunnel pipe.

[0031] In this embodiment, the workpiece 13 can be a steel plate of stainless steel material known to those skilled in the art.

[0032] When it is necessary to produce a tunnel pipe by using the tunnel pipe forming device of the application, first, the workpiece 13 of stainless steel plate is placed at the inlet of the former body 3, and the workpiece 13 is tightly fitted with the lubricating mechanism on the inner wall of the former body 3.

[0033] Then, the workpiece 13 is pushed towards the inside of the former body 3 by using external driving force, at this time the workpiece 13 will slide on the inner wall of the spiral structure of the former body 3 to enter spirally (referring toFigure 8 ), and will be extruded by the inner wall of the former body 3, so as to bend the plate-shaped workpiece 13 into a spiral structure, thereby completing the production of the tunnel pipe.

[0034] When the workpiece 13 slides on the inner wall of the former body 3 and is extruded by the inner wall of the former body 3, the lubricating mechanism can reduce the friction between the workpiece 13 and the inner wall of the former body 3, thereby reducing the wear of the workpiece 13 on the inner wall of the former body 3. At the same time, the reduction of the friction can also reduce the external driving force, thereby reducing the driving cost and improving the production efficiency.

[0035] In addition, the tunnel pipe forming device of the present application can reduce the friction between the workpiece 13 and the inner wall of the former body 3 by the setting of the lubricating mechanism, without adding lubricating liquid on the inner wall of the former body 3 to reduce the friction, so as not to pollute the surface and the weld of the workpiece 13. Therefore, before welding the workpiece 13 (i.e. the tunnel pipe after forming), the lubricating liquid on the surface and the weld of the workpiece 13 does not need to be removed, thereby further improving the production efficiency and reducing the labor cost of additional removal of the lubricating liquid.

[0036] In addition, compared with the existing former, the tunnel pipe forming device of the present application has lower equipment investment, higher quality of the produced tunnel pipe product, and simpler manufacturing process.

[0037] According to one embodiment of the present application, the supporting mechanism comprises a base 1 and a supporting leg 2, the supporting leg 2 is detachably installed at the top end of the base 1, and the former body 3 is detachably installed at the top end of the supporting leg 2. The base 1 and the supporting leg 2 can be made of stainless steel material known to those skilled in the art.

[0038] In this embodiment, referring to Figure 1 or Figure 3 , the number of the supporting leg 2 can be preferably two, and is arranged on both sides of the former body 3 in sequence. The shape of the supporting leg 2 can be a U-shaped structure, and a reinforcing rib can be further arranged between the bottom plate and the side plate of the U-shaped structure, thereby increasing the firmness of the supporting leg 2, and further increasing the firmness of the support to the former body 3.

[0039] The bottom plate of the supporting leg 2 can be installed on the top of the base 1 by a detachable connection manner known to those skilled in the art, such as bolt connection. The former body 3 can be installed on the top of the supporting leg 2 by a detachable connection manner known to those skilled in the art, such as bolt connection.

[0040] In addition, referring to Figure 3The base 1 can be a hollow structure, thereby reducing the weight of the base 1, increasing the portability of the base 1, reducing the use of materials for producing the base 1, achieving the environmental protection effect, and reducing the cost.

[0041] According to one embodiment of the present application, the top end of the base 1 is provided with a pad 4, which is arranged at the inlet of the former body 3, and the thickness of the pad 4 is the same as the wall thickness at the inlet of the former body 3. The pad 4 can be made of stainless steel material known to those skilled in the art.

[0042] In the present embodiment, referring to Figure 3 , the pad 4 can be a cuboid structure and is located at the inlet of the spiral former body 3. When the tunnel pipe forming is performed on the workpiece 13 by using the former body 3, the pad 4 can play a role of lifting the workpiece 13 at the inlet of the former body 3, thereby ensuring the relative flatness at the inlet of the former body 3 and making the workpiece 13 more smoothly enter into the former body 3 without being affected by the thickness of the former body 3, further ensuring the smooth performance of the tunnel pipe forming work.

[0043] According to one embodiment of the present application, referring to Figure 10 and Figure 11 , the lubricating mechanism comprises a plurality of balls 12, which can be made of stainless steel material. A plurality of mounting holes are formed on the former body 3, and the plurality of balls 12 are respectively limitedly installed in the plurality of mounting holes and are in sliding connection with the mounting holes. Referring to Figure 2 , one end of the ball 12 is located at least in the cylindrical structure of the former body 3, and the end of the ball 12 located in the cylindrical structure of the former body 3 (i.e. the end of the ball 12 away from the mounting hole matched therewith) protrudes from the inner wall of the former body 3 and is in sliding cooperation with the outer wall of the workpiece 13, and the protruding height can be 1 mm. Further, the lubricating mechanism further comprises a plurality of mounting blocks 11, which are respectively detachably installed in the plurality of mounting holes. The ball 12 is limitedly and slidingly installed on the mounting block 11, and the ball 12 is in sliding connection with the mounting block 11, and the ball 12 is connected with the mounting hole through the mounting block 11. When the mounting block 11 is installed in the mounting hole, the end of the ball 12 located in the cylindrical structure of the former body 3 also protrudes from the inner wall of the former body 3 to realize the relative sliding cooperation with the outer wall of the workpiece 13.

[0044] In the present embodiment, referring to Figure 10 and Figure 11 , the diameter of the mounting hole can be 12 mm. Referring to Figure 1 , Figure 3 or Figure 9The number of mounting holes can be 300-400 and are evenly arranged along the circumference of the former body 3. Preferably, the mounting holes are arranged horizontally and vertically on the former body 3, i.e. transversely (in the axial direction of the former body 3) as several rows in a horizontal direction and longitudinally (in the circumferential direction of the former body 3) as several columns in a vertical direction.

[0045] The mounting block 11 can be a cylindrical structure, one end of which can be a circular table structure, and the ball 12 is limited and slidably mounted on the circular table structure. The detachable connection between the mounting block 11 and the mounting hole can be connected in the form of a thread known in the art. Among them, the outer wall of the mounting block 11 is provided with a thread (not shown in the figure), and the hole wall of the mounting hole is provided with a thread corresponding to the outer wall of the mounting block 11. Thus, the mounting block 11 can be mounted in the mounting hole by threaded connection.

[0046] Further, when the mounting block 11 is mounted in the mounting hole, there can be a certain friction between the threads provided on the outer wall of the mounting block 11 and the threads provided on the hole wall of the mounting hole. For example, a slip-resistant material known in the art can be used to achieve the friction between the two.

[0047] When the workpiece 13 is tunnel pipe formed in the cylindrical structure of the former body 3, since the ball 12 protrudes from the inner wall of the former body 3 at one end of the cylindrical structure of the former body 3 (i.e. the end of the ball 12 away from the mounting hole it cooperates with), the ball 12 can change the friction between the workpiece 13 and the inner wall of the former body 3 from sliding friction to rolling friction, thereby greatly reducing the friction between the two, thereby reducing the wear of the workpiece 13 on the inner wall of the former body 3, reducing the external driving force and driving cost, and increasing the production efficiency.

[0048] When the workpiece 13 is tunnel pipe formed in the cylindrical structure of the former body 3, i.e. the workpiece 13 is closely attached to the ball 12 on the mounting block 11 and moves, the mounting block 11 can be loose in the mounting hole under the pressure of the workpiece 13, and the ball 12 can be lower than the height of the inner wall of the former body 3, or even the mounting block 11 can fall off from the mounting hole. In an embodiment of the present application, the mounting block 11 can be prevented from being loose in the mounting hole by the friction between the threads provided on the outer wall of the mounting block 11 and the threads provided on the hole wall of the mounting hole, thereby ensuring the smooth progress of the tunnel pipe forming work.

[0049] In addition, since the plurality of balls 12 protrude from the inner wall of the forming body 3 at one end of the cylindrical structure of the forming body 3, and the number of the balls 12 is 300-400 and the balls 12 are uniformly arranged on the forming body 3, when the workpiece 13 is formed into a tunnel pipe by abutting against the inner wall of the forming body 3, the large number of balls 12 can greatly reduce the direct contact between the workpiece 13 and the inner wall of the forming body 3, and even can directly avoid the direct contact between the workpiece 13 and the inner wall of the forming body 3, that is, the workpiece 13 will rarely or even not rub against the inner wall of the forming body 3, thereby further reducing the abrasion of the inner wall of the forming body 3 by the workpiece 13.

[0050] In addition, the number of the mounting holes provided on the forming body 3 can be adjusted by the person skilled in the art according to the actual situation, and the diameter and material of the balls 12 can also be adjusted according to the actual situation, so that the device can better adapt to workpieces 13 of different diameters or different materials, and can prevent scratches or adhesion to the surface of the workpieces 13 of different diameters or different materials.

[0051] According to one embodiment of the present application, referring to Figure 4 or Figure 6 , the device for forming a tunnel pipe further comprises a calibration cylinder 8 for calibrating the lubricating mechanism on the forming body 3. The calibration cylinder 8 is a hollow structure and is located inside the cylindrical structure of the forming body 3 (referring to Figure 9 ), and the calibration cylinder 8 is coaxially arranged with the forming body 3 and gap-fitted with the inner wall of the forming body 3, and the width of the gap can be preferably 1 mm. The calibration cylinder 8 is provided with a plurality of calibration mechanisms along the circumference, and the calibration mechanisms are located at one end of the outside of the calibration cylinder 8 and abut against the inner wall of the forming body 3. Further, referring to Figure 5 or Figure 7 , the calibration mechanism comprises a calibration slot 10 provided on the outer wall of the calibration cylinder 8, a calibration hole is provided in the calibration slot 10, and a calibration screw 14 is threadedly installed in the calibration hole; when the calibration cylinder 8 calibrates the lubricating mechanism on the forming body 3, the calibration screw 14 at one end of the outside of the calibration cylinder 8 abuts against the inner wall of the forming body 3.

[0052] In the present embodiment, referring to Figure 6 , the number of the calibration mechanisms can be 6, and they are uniformly arranged along the circumference of the calibration cylinder 8, that is, the number of the calibration slots 10 can be 6, and they are uniformly arranged along the circumference of the calibration cylinder 8. Preferably, the calibration slot 10 can be a rectangular slot body and is provided along the length direction (i.e. the axial direction) of the calibration cylinder 8.

[0053] According to one embodiment of the present application, in the present embodiment, referring to Figure 6The number of the calibration holes can be several, preferably 8. For example, the 8 calibration holes are arranged vertically along the length direction of the calibration groove 10 in the rectangular calibration groove 10, and a calibration bolt 14 is threadedly installed in each calibration hole.

[0054] In addition, a hard buffer layer, such as a hard rubber or other material known in the art, can be installed at the end of the calibration bolt 14 outside the calibration cylinder 8. When the end of the calibration bolt 14 outside the calibration cylinder 8 contacts the inner wall of the former body 3, the buffer layer can prevent the calibration bolt 14 from directly contacting the inner wall of the former body 3, because the hardness of the hard rubber is much lower than the hardness of the material of the former body 3, thereby effectively preventing the calibration bolt 14 from wearing the inner wall of the former body 3, and further preventing the wear of the inner wall of the former body 3.

[0055] According to an embodiment of the present application, a plurality of lifting holes 9 are formed at one end of the calibration cylinder 8.

[0056] In the present embodiment, referring to Figure 4 The number of the lifting holes 9 can be two, and the shape can be a rectangle with four inner corners each provided with a circular arc transition. The two lifting holes 9 can be oppositely formed at the top of the calibration cylinder 8, and the two lifting holes 9 are equal in size and located on the same horizontal plane. Those skilled in the art can also form more than two lifting holes 9 at the top of the calibration cylinder 8 according to actual needs.

[0057] When the calibration cylinder 8 needs to be lifted, an external lifting device can be used to extend a grappling hook into the lifting hole 9, thereby conveniently lifting the calibration cylinder 8. The external lifting device and the grappling hook are known in the art and will not be described in detail here.

[0058] According to an embodiment of the present application, the outer wall of the former body 3 is detachably installed with a front protective gas device connecting block 5, a welding gun connecting block 6, and a back protective gas device connecting block 7. The front protective gas device connecting block 5 is detachably installed with a front protective gas device (not shown in the figure), the back protective gas device connecting block 7 is detachably installed with a back protective gas device (not shown in the figure), and the welding gun connecting block 6 is detachably installed with a welding gun (not shown in the figure).

[0059] In the present embodiment, referring to Figure 1The front protective gas device connecting block 5, the welding gun connecting block 6 and the back protective gas device connecting block 7 can be connected with the former body 3 in a manner known to those skilled in the art, for example, detachably mounted on the outer wall of the former body 3 by bolts. The front protective gas device connecting block 5 can be a 90° bent flange structure, the welding gun connecting block 6 can be a U-shaped bent flange structure, and the back protective gas device connecting block 7 can be a cuboid structure. Figure 1 The opening of the U-shaped welding gun connecting block 6 can face the former body 3, and the back protective gas device connecting block 7 can be a cuboid structure.

[0060] When the workpiece 13 enters the former body 3 in a spiral and gradually forms a tunnel pipe, the sidewall of the formed tunnel pipe will have a spiral-shaped weld to be welded; therefore, the weld to be welded needs to be welded to achieve the closure of the sidewall of the tunnel pipe and complete the preliminary production of the tunnel pipe.

[0061] In use, the workpiece 13 gradually enters the inside of the cylindrical structure of the former body 3 to form a tunnel pipe and gradually extends out of the outlet of the former body 3. Specifically, before using the former body 3 to perform tunnel pipe forming work on the workpiece 13, the welding gun can be installed on the welding gun connecting block 6 in advance, and the head of the welding gun is aligned with the weld of the sidewall of the tunnel pipe that will extend out of the outlet of the former body 3. Then the front protective gas device can be installed on the front protective gas device connecting block 5 in advance, and the back protective gas device can be installed on the back protective gas device connecting block 7. Finally, the air outlet of the front protective gas device is aligned with the front of the weld of the tunnel pipe that will extend out of the outlet of the former body 3, and the air outlet of the back protective gas device is aligned with the back of the weld of the tunnel pipe that will extend out of the outlet of the former body 3, so as to complete the preparation work for welding.

[0062] When the tunnel pipe is about to extend out of the outlet of the former body 3, the welding gun, the front protective gas device and the back protective gas device are started at the same time. At this time, the welding gun performs butt welding on the weld of the tunnel pipe, the front protective gas device and the back protective gas device provide protective gas to the front and back of the weld at the same time, which can effectively prevent the surface of the metal at the weld from being oxidized, avoid the formation of an oxide layer and related defects, improve the weld forming, and make the weld smooth and uniform. In addition, the front protective gas device and the back protective gas device can also cool the welding area during welding, reduce the heat affected zone, and prevent deformation and grain coarsening at the weld, thereby ensuring the good and normal progress of the welding work.

[0063] In the process of welding the weld on the sidewall of the tunnel pipe, the workpiece 13 gradually enters the inside of the cylindrical structure of the former body 3 by external driving force, so the formed tunnel pipe at the outlet of the former body 3 gradually extends from the outlet of the former body 3, that is, the tunnel pipe is in a moving state; and since the workpiece 13 is spirally formed in the inside of the cylindrical structure of the former body 3, the weld of the tunnel pipe is always at the same relative position at the outlet of the former body 3 under the movement of the tunnel pipe. Therefore, in the process of welding the weld of the tunnel pipe, the welding gun, the front shielding gas device and the back shielding gas device only need to be installed on the former body 3, without the need of moving the positions of the welding gun, the front shielding gas device and the back shielding gas device during the welding process, so that the welding of the tunnel pipe is completed, and the labor cost of welding the tunnel pipe is greatly reduced.

[0064] The application also provides a calibration method of the tunnel pipe forming device, which comprises the step of calibrating the tunnel pipe forming device, and one embodiment comprises: S1, placing the former body 3 provided with mounting holes in a vertical direction.

[0065] S2, hooking the lifting hole 9 with a hook on an external lifting device, and lifting the calibration cylinder 8 into the inside of the cylindrical structure of the former body 3 in S1 in a vertical direction (refer to Figure 9 or Figure 12 ).

[0066] S3, measuring the positions of the calibration cylinder 8 and the former body 3 by an external measuring device, and measuring the coaxial position of the calibration cylinder 8 and the former body 3 (i.e. the position of the same center of the cross section of the calibration cylinder 8 and the former body 3). After the measurement, continue to move the calibration cylinder 8 in S2 in the former body 3 by the external lifting device, and move to the measured position, so as to adjust the calibration cylinder 8 to the coaxial position of the former body 3 (refer to Figure 12 ). During the movement of the calibration cylinder 8, the calibration hole on the calibration cylinder 8 is moved to the staggered position of the mounting hole on the former body 3, that is, the calibration hole and the mounting hole are arranged in different axes. The external measuring device is known to those skilled in the art, and will not be described here.

[0067] S4, screwing the calibration bolt 14 into each calibration hole from the inside of the calibration cylinder 8 provided with the calibration hole in S3, and stopping the screwing of the calibration bolt 14 after the end of the calibration bolt 14 outside the calibration cylinder 8 contacts the inner wall of the former body 3.

[0068] S5, from the outside of the former body 3 in S4, screw into the mounting block 11 in each mounting hole, until the ball 12 on the mounting block 11 contacts the outer wall of the calibration cylinder 8, stop screwing into the mounting block 11. Thus, it can be guaranteed that the distance between each ball 12 and the inner wall of the former body 3 is the same (in this embodiment, the distance is 1mm), and further, it can be guaranteed that the subsequent lubrication work of the workpiece 13 is carried out smoothly.

[0069] S6, reverse screw each calibration screw 14, so that each calibration screw 14 is out of contact with the inner wall of the former body 3. Then use the external hoisting device through the lifting hole 9 to lift the calibration cylinder 8 in S5 from the inside of the cylindrical structure of the former body 3, thereby completing the calibration of the tunnel pipe forming device.

[0070] Embodiment 2 The difference between this embodiment and embodiment 1 is that when the calibration cylinder 8 is located in the former body 3 to calibrate the tunnel pipe forming device, the mounting block 11 with the ball 12 is screwed into the calibration hole in the calibration cylinder 8 instead of the calibration screw 14, and the screwing of the mounting block 11 in the calibration hole is stopped when the ball 12 contacts the inner wall of the former body 3.

[0071] When it is necessary to lift the calibration cylinder 8 from the inside of the cylindrical structure of the former body 3, in this embodiment, it is not necessary to reverse screw each mounting block 11 to make the ball 12 out of contact with the inner wall of the former body 3, but directly lift the calibration cylinder 8 from the inside of the cylindrical structure of the former body 3. That is, during the lifting of the calibration cylinder 8, the ball 12 will roll with the inner wall of the former body 3, and thus will not slide with the inner wall of the former body 3. Therefore, it is not necessary to reverse screw each mounting block 11, which greatly saves the labor cost.

[0072] The above embodiments of the present application can be combined with each other, and have corresponding technical effects.

[0073] The above is only the preferred embodiment of the present application, and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A device for forming tunnel pipes, characterized in that, It includes a support mechanism, a molding body (3), and a lubrication mechanism, wherein: The molding body (3) is detachably installed on the top of the support mechanism, and the molding body (3) is a hollow cylindrical structure. A plurality of the lubrication mechanisms are detachably installed on the molding body (3), and one end of the lubrication mechanism protrudes from the inner wall of the cylindrical structure of the molding body (3). The cylindrical structure of the forming body (3) is used to accommodate and form the workpiece (13). During the forming process of the workpiece (13), the end of the lubrication mechanism protruding from the inner wall of the cylindrical structure of the forming body (3) slides and engages with the outer wall of the workpiece (13) within the cylindrical structure of the forming body (3). The lubrication mechanism includes ball bearings (12). The forming body (3) has several mounting holes. Several ball bearings (12) are respectively limited and installed in several mounting holes, and the ball bearings (12) are slidably connected to the mounting holes. One end of the ball bearing (12) away from the mounting hole it mates with protrudes from the inner wall of the cylindrical structure of the forming body (3) and slides in mate with the outer wall of the workpiece (13). The lubrication mechanism further includes mounting blocks (11), and several mounting blocks (11) are detachably mounted in several mounting holes; the ball (12) is slidably mounted on the mounting block (11) and the ball (12) is slidably connected to the mounting block (11), and the ball (12) is connected to the mounting hole through the mounting block (11); Several mounting blocks (11) are threadedly connected to several mounting holes respectively, and there is friction between the threads on the outer wall of the mounting block (11) and the threads on the wall of the mounting hole.

2. The apparatus for forming tunnel pipes according to claim 1, characterized in that, The molding body (3) has a spiral structure.

3. The apparatus for forming tunnel pipes according to claim 1, characterized in that, The support mechanism includes a base (1) and a leg (2), the leg (2) being detachably mounted on the top of the base (1), and the molding body (3) being detachably mounted on the top of the leg (2).

4. The tunnel tube forming apparatus according to claim 3, characterized in that, A pad (4) is installed at the top of the base (1). The pad (4) is positioned corresponding to the entrance of the molding body (3). The thickness of the pad (4) is the same as the wall thickness at the entrance of the molding body (3).

5. The apparatus for forming tunnel pipes according to claim 1, characterized in that, The tunnel tube forming device further includes a calibration cylinder (8), which is used to calibrate the lubrication mechanism on the forming body (3). The calibration cylinder (8) is a hollow structure and is located inside the cylindrical structure of the forming body (3). The calibration cylinder (8) is coaxially arranged with the forming body (3) and has a clearance fit with the inner wall of the forming body (3). A plurality of calibration mechanisms are arranged circumferentially on the calibration cylinder (8). One end of the calibration mechanism located outside the calibration cylinder (8) is used to abut against the inner wall of the forming body (3).

6. The apparatus for forming tunnel pipes according to claim 5, characterized in that, The calibration mechanism includes a calibration groove (10) on the outer wall of the calibration cylinder (8), a calibration hole is provided in the calibration groove (10), and a calibration bolt (14) is threaded in the calibration hole; when the calibration cylinder (8) calibrates the lubrication mechanism on the molding body (3), one end of the calibration bolt (14) located outside the calibration cylinder (8) abuts against the inner wall of the molding body (3).

7. The apparatus for forming tunnel pipes according to claim 5, characterized in that, The calibration cylinder (8) has several hoisting holes (9) at one end.

8. A calibration method for a tunnel pipe forming apparatus, characterized in that, The step of calibrating the tunnel forming apparatus according to any one of claims 1-7 includes: S1. Place the molding body (3) vertically; S2. Hoist the calibration cylinder (8) into the cylindrical structure of the forming body (3); S3. Adjust the calibration cylinder (8) and the forming body (3) to be coaxial; S4. Install the calibration bolt (14) from inside the calibration cylinder (8) into the calibration hole until the end of the calibration bolt (14) located outside the calibration cylinder (8) contacts the inner wall of the molding body (3); S5. Install the mounting block (11) from the outside of the molding body (3) into the mounting hole until the ball (12) on the mounting block (11) contacts the outer wall of the calibration cylinder (8); S6. Lift the calibration cylinder (8) out of the cylindrical structure of the molding body (3).

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