A forming die for a pipe joint

Abstract

The present invention provides a forming die for a pipeline interface, comprising: a base; an outer die for applying stress to the outer surface of the pipeline; a plurality of inner flap dies, the plurality of inner flap dies forming a cylinder, a through hole being provided in the middle of the cylinder, the through hole being conical; an inner flap die driving part, the inner flap die driving part comprising a cone, a guiding part and a limiting projection, the cone being connected to the guiding part, the limiting projection being two and respectively arranged on both sides of the bottom of the cone, the limiting projection just touching the lower surface of the base when the inner flap die driving part reaches the maximum moving distance so as to prevent the inner flap die driving part from continuing to move; a guiding cylinder arranged on the lower surface of the base, the guiding cylinder comprising a guiding hole, the guiding hole being matched with the guiding part and the limiting projection to ensure the moving direction of the inner flap die driving part. The limiting projection of the present invention can prevent the inner flap die driving part from moving over-position, thereby causing damage to the inner flap die. In addition, the guiding cylinder ensures the moving direction of the inner flap die driving part.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline interfaces, and particularly to the technical field of a forming die for pipeline interfaces. Background Art

[0002] In the field of pipeline interfaces, common interface methods include forms such as welding, flange connection, and threading, as well as flexible connection methods. In the prior art, the flexible connection method is generally achieved through a sealing ring. Such a connection method requires a circular protrusion S to be provided at the interface of the pipeline (as Figure 1 shown).

[0003] In the prior art, the circular protrusion S is generally formed by the shaping part of the die extruding the joint of the pipeline. However, there are still many problems with the existing die: the inner die is easily damaged by the hydraulic rod, and the driving rod moves obliquely, resulting in uneven stress on the inner die, which is easily extruded and deformed, and the formation of the protrusion S of the interface is also uneven.

[0004] Therefore, there is an urgent need for a pipeline interface forming die that can avoid damage to the inner die and prevent uneven deformation of the inner die due to uneven stress. Summary of the Invention

[0005] The purpose of the present invention is to provide a pipeline interface forming die that can avoid damage to the inner die and prevent uneven deformation of the inner die due to uneven stress.

[0006] In order to achieve the above purpose, the present invention is realized through the following technical solutions:

[0007] A pipeline interface forming die is provided, including:

[0008] A base, with an opening provided in the middle of the base;

[0009] An outer die, placed on the upper surface of the base, for applying stress to the outer surface of the pipeline;

[0010] A plurality of inner flap dies, the plurality of inner flap dies form a cylinder, a through hole is provided in the middle of the cylinder, and the through hole is conical; the plurality of inner flap dies are arranged in the opening of the base and can move limitedly along the radial direction of the opening, for applying stress to the inner surface of the pipeline to cooperate with the outer die to realize the forming of the pipeline interface;

[0011] An inner flap die driving part, the inner flap die driving part includes a cone, a guiding part, and a limiting protrusion. The cone is connected to the guiding part. There are two limiting protrusions, respectively arranged on both sides of the bottom of the cone. When the inner flap die driving part reaches the maximum moving distance, the limiting protrusions just touch the lower surface of the base to prevent the inner flap die driving part from continuing to move;

[0012] The guide cylinder is disposed on the lower surface of the base. The guide cylinder includes a guide hole which cooperates with the guide portion and the limit protrusion to ensure the direction of movement of the inner flap die driving portion.

[0013] Wherein, a part of the inner flap die driving portion is disposed in the through hole, and the cone cooperates with the through hole to drive the plurality of inner flap dies to move limitedly along the radial direction of the opening by the movement of the inner flap die driving portion.

[0014] Furthermore, the guide hole is a circular hole, and the guide portion is cylindrical; the circular hole cooperates with the cylindrical guide portion, and another part of the inner flap die driving portion is placed in the circular hole and can move relative to the circular hole.

[0015] Furthermore, limiting grooves extending along the axial direction of the guide cylinder are provided on both sides of the circular hole, and the limiting grooves cooperate with the limit protrusions.

[0016] Furthermore, the base includes an upper substrate and a lower substrate. The upper substrate is provided with an opening, and the lower substrate is provided with an opening. Both openings are circular, and the diameter of the opening of the upper substrate is larger than the diameter of the opening of the lower substrate.

[0017] Furthermore, steps are provided around the opening on the upper surface of the lower substrate to form an annular clamping portion between the lower surface of the upper substrate and the upper surface of the lower substrate.

[0018] Furthermore, a circumferentially extending annular groove is provided on the surface of the cylinder, and the annular groove cooperates with the upper substrate; an annular base is formed below the annular groove.

[0019] Furthermore, the annular base is placed in the annular clamping portion, and the annular base cooperates with the annular clamping portion.

[0020] Furthermore, there are two outer molds, and the outer molds are in a clamp shape. The surface of the clamp shape facing the inner flap die is semi-circular.

[0021] Furthermore, a receiving ring groove is provided on the upper surface of the upper substrate corresponding to the position of the pipe interface for receiving the pipe interface.

[0022] Furthermore, a gasket ring is further included. The gasket ring is disposed on the circumference of the cylinder formed by the plurality of inner flap dies for covering the shaping portion on the circumference of the cylinder formed by the plurality of inner flap dies.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] The limit protrusion of the inner flap die driving part of the present invention can contact the lower surface of the base when the inner flap die driving part moves upward to the maximum distance, preventing the inner flap die driving part from continuing to move upward, thus preventing the inner flap die from being squeezed and deformed due to the continuous upward movement of the inner flap die driving part, and also preventing the rotation of the inner flap die driving part; at the same time, the guiding cylinder can allow the inner flap die driving part to move on the vertical axis passing through the center of the cylinder formed by multiple inner flap dies, avoiding the uneven force on the inner die caused by the skewed movement direction of the inner flap die driving part and being squeezed and deformed, and also avoiding the uneven formation of the protrusion S of the pipe interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for description will be briefly introduced below. Obviously, the drawings in the following description are an embodiment of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

[0026] Figure 1 Schematic diagram of the interface structure of a pipe in the prior art;

[0027] Figure 2 Cross-sectional view of the pipe interface forming die provided by the present invention;

[0028] Figure 3 Another cross-sectional view of the pipe interface forming die provided by the present invention;

[0029] Figure 4 Another cross-sectional view of the pipe interface forming die provided by the present invention;

[0030] Figure 5 Schematic diagram of the structure of the pipe interface forming die provided by the present invention;

[0031] Figure 6 Schematic diagram of the structure of the guiding part provided by the present invention;

[0032] Figure 7 Schematic diagram of the structure of the gasket ring provided by the present invention;

[0033] Figure 8 Top view of the outer die provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The following further elaborates on the solution proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and understandable, please refer to the accompanying drawings. It should be noted that the structures, scales, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the efficacy that the present invention can produce and the purpose that can be achieved, should still fall within the scope covered by the technical content disclosed by the present invention.

[0035] Figure 2 The structural schematic diagram of the pipe joint forming die provided by the present invention is shown, as Figure 2 shown, the pipe joint forming die includes:

[0036] A base 100, with an opening provided in the middle of the base; optionally, the opening vertically penetrates the base 100.

[0037] An outer die 200, placed on the upper surface of the base, for applying stress to the outer surface of the pipe;

[0038] A plurality of inner flap dies 300, the plurality of inner flap dies form a cylinder, with a through hole provided in the middle of the cylinder, and the through hole is conical; the plurality of inner flap dies are arranged in the opening of the base and can move limitedly along the radial direction of the opening, for applying stress to the inner surface of the pipe to cooperate with the outer die to achieve the forming of the pipe joint; wherein, the middle is the center position of the cylinder; optionally, the through hole vertically penetrates the cylinder. Optionally, the shape and size of each inner flap die 300 can be the same.

[0039] The inner flap die driving part, the inner flap die driving part includes a cone 401, a guiding part 404 and a limiting protrusion 402, the cone 401 is connected with the guiding part 404, there are two limiting protrusions 402, respectively arranged on both sides of the bottom of the cone 401, and the limiting protrusions just touch the lower surface of the base 100 when the inner flap die driving part reaches the maximum moving distance, thereby preventing the inner flap die driving part from continuing to move; optionally, the guiding part 404 is cylindrical, and the diameter of the cylindrical guiding part 404 is the same as the diameter of the bottom of the cone 401.

[0040] The guiding cylinder 500 is arranged on the lower surface of the base 100. The guiding cylinder includes a guiding hole which cooperates with the guiding part 404 and the limiting protrusion to ensure the moving direction of the inner flap die driving part.

[0041] Wherein, a part of the inner flap die driving part is arranged in the through hole, and the cone cooperates with the through hole. The movement of the inner flap die driving part drives the plurality of inner flap dies to move limitedly along the radial direction of the opening.

[0042] The inner flap die driving part of the present invention is connected to the driving part. The driving part includes but is not limited to a cylinder and a screw rod, so as to drive the inner flap die driving part to move vertically up and down. The inner flap die driving part moves up and down. Under the push of the inclined surface of the cone, the plurality of inner flap dies 300 move along the radial direction, so as to apply stress to the inner surface of the pipeline.

[0043] The limiting protrusion 402 of the inner flap die driving part of the present invention can contact the lower surface of the base when the inner flap die driving part moves up to the maximum distance, avoiding the continuous upward movement of the inner flap die driving part, thus preventing the inner flap die 300 from being squeezed and deformed due to the continuous upward movement of the inner flap die driving part, and also preventing the rotation of the inner flap die driving part. At the same time, the guiding cylinder can allow the inner flap die driving part to move on the vertical axis where the center of the cylinder formed by the plurality of inner flap dies is located, avoiding the uneven force on the inner die caused by the skewed moving direction of the inner flap die driving part and being squeezed and deformed, and also avoiding the uneven formation of the protrusion S of the pipeline interface.

[0044] Wherein, optionally, the number of the inner flap dies 300 is preferably 6 - 12.

[0045] Optionally, as Figure 6 shown, the guiding hole is a round hole, and the guiding part 404 is cylindrical. The round hole cooperates with the cylindrical guiding part. Another part of the inner flap die driving part is placed in the round hole and can move relative to the round hole. Limiting grooves 501 extending along the axial direction of the guiding cylinder are arranged on both sides of the round hole, and the limiting grooves 501 cooperate with the limiting protrusions 402. Due to the cooperative setting of the guiding part and the guiding cylinder, the inner flap die driving part can only move in the vertical direction, preventing the angular deviation of the movement of the inner flap die driving part in the vertical direction. The deviation of the inner flap die driving part will cause different inner flap dies 300 at different positions to be stressed unevenly. Thus, after long-term use, the inner flap die 300 with large stress will be deformed and damaged. At the same time, the cooperation between the limiting groove 501 and the limiting protrusion 402 can prevent the rotation of the cone 401.

[0046] Preferably, the base includes an upper substrate 101 and a lower substrate 102. The upper substrate is a circular plate with an opening provided in the middle thereof, i.e., at the center position. The lower substrate is also a circular plate with an opening provided in the middle thereof, i.e., at the center position. The openings of both the upper substrate and the lower substrate are circular, and the openings of the upper substrate and the lower substrate together form the opening. The diameter of the opening of the upper substrate 101 is larger than the diameter of the opening of the lower substrate 102.

[0047] Further, steps are provided around the opening on the upper surface of the lower substrate 102 to form an annular clamping portion 103 between the lower surface of the upper substrate 101 and the upper surface of the lower substrate 102. An annular groove 301 extending circumferentially is provided on the surface of the cylinder, and the annular groove 301 cooperates with the upper substrate 101, i.e., the height of the annular groove 301 is the same as the thickness of the upper substrate 101. An annular base 303 is formed below the annular groove. The annular base 303 is placed in the annular clamping portion 103 and the annular base 303 cooperates with the annular clamping portion 103, i.e., the thickness of the annular base 303 is the same as the height of the annular clamping portion 103. Therefore, when the cone of the inner flap die driving part moves upward, the inner flap die will be pushed and move along its radial direction. At this time, the multiple inner flap dies of the cylinder are pushed one by one along their radial directions, so that the complete cylinder becomes petal-shaped. When the inner flap die is pushed to move along its radial direction, due to the cooperation between the annular groove 301 and the upper substrate 101, and the cooperation between the annular base 303 and the annular clamping portion 103, the inner flap die moves stably, and at the same time, no deflecting force can be formed, avoiding the extrusion deformation of the inner flap die.

[0048] Optionally, as Figure 3 shown, a receiving ring groove 103 is provided at the position corresponding to the pipe interface on the upper surface of the upper substrate 101. The receiving ring groove 103 is used to receive the pipe interface, and the center of the receiving ring groove 103 is concentric with the center of the cylinder formed by the multiple inner flap dies. The pipe interface is inserted into the receiving ring groove, so that the pipe interface is positioned by the receiving ring groove. In this way, when the outer die applies stress from the outer surface of the pipe and the inner flap die applies stress from the inner surface of the pipe at the same time, the forces on the inner surface and the outer surface can be applied more evenly, preventing the moving distances of each inner flap die in the radial direction from being different.

[0049] Further optionally, as Figure 4As shown in the figure, an arc-shaped protrusion 104 is provided at the edge of the accommodation ring groove 103 away from the inner flap die 300. An arc-shaped notch is provided at the front edge of the lower surface of the outer die 200. The arc-shaped notch cooperates with the arc-shaped protrusion 104. The front surface of the front end of the outer die 200 is coplanar with the side surface of the arc-shaped protrusion 104 close to the inner flap die 300. Thus, the outer die 200 cannot continue to move towards the inner flap die 300, preventing the outer die 200 from applying a shearing force to the pipe joint. At the same time, the pipe joint is formed by the force applied by the inner flap die 300. Since the center of the guiding portion 404 and the center of the moved inner flap die 300 are concentric, it can be ensured that the distance of each inner flap die 300 moving along the radial direction is the same. Finally, it is ensured that the protrusions S formed on the pipe joint are uniform, and the force received by each inner flap die 300 is also uniform, preventing the inner flap die 300 with a larger force from being damaged due to uneven force.

[0050] Optionally, as Figure 8 shown, there are two outer dies 200. The outer dies are in a clamp shape. The surface facing the inner flap die (i.e., the front surface) of the clamp shape is semi-circular. Thus, the two outer dies can clamp the entire outer surface of the pipe joint.

[0051] Optionally, as Figure 2-5 shown, a shaping portion extending along the circumferential direction is provided on the surface of the cylinder. The shaping portion is selected according to the shape required to be formed on the pipe joint. Optionally, the shaping portion can be an annular convex portion 305. An annular concave portion 205 extending along the transverse direction is provided on the surface of the outer die facing the inner flap die. The annular convex portion 305 and the annular concave portion 205 cooperate to form at the pipe joint.

[0052] As Figure 5 、 7As shown, after each inner flap die on the cylinder formed by multiple inner flap dies 300 moves radially, a gap will be formed between adjacent inner flap dies 300. Such a gap will be formed on the inner surface of the pipe joint when the inner flap die 300 and the outer die 200 extrude the pipe joint. In this regard, optionally, the forming die further includes a gasket ring 307. The gasket ring 307 is placed circumferentially on the cylinder formed by the multiple inner flap dies 300 for covering the profiling part on the circumference of the cylinder formed by the multiple inner flap dies. The gasket ring 307 is adapted to the shape of the profiling part. A positioning hole 305 is provided at the corresponding profiling part of one inner flap die 300, and a positioning pin 308 is provided on the inner surface of the gasket ring 307. The positioning hole 305 and the positioning pin 308 are adapted in shape. As shown, the positioning hole can be non-circular, such as oval or rectangular. Then the cross-section of the positioning pin 205 is at least one of oval and rectangular. The shown gasket ring 307 is also provided with a notch 309, so that the shown gasket ring 307 forms a breakable ring. The circumference of the gasket ring 307 is the same as the diameter of the cylinder formed by the multiple inner flap dies 300 after radial movement. The gasket ring 307 can prevent the gap from being formed on the inner surface of the pipe joint. The positioning hole and the positioning pin can facilitate the disassembly and fixing of the gasket ring and facilitate the replacement when the gasket ring is damaged. At the same time, the cut 309 can facilitate the installation and disassembly of the gasket ring 307 and can also facilitate the radial movement of the inner flap die 300.

[0053] During use, the gasket ring 307 is fixed on the positioning hole 305. In the initial position, the cone of the inner flap die driving part is at the lowest position, and the multiple inner flap dies form a cylinder. First, the joint of the pipe is placed between the annular gap formed by the outer die and the multiple inner flap dies, and then the joint of the pipe is placed in the receiving ring groove 103. Then, the two outer dies start to move towards each other until they stop contacting the outer surface of the pipe. Next, the cone starts to move upward, driving the inner flap die to move radially outward along it. The inner flap die starts to contact the inner surface of the pipe. Under the extrusion of the inner flap die and the outer die, an annular protrusion S is formed at the joint of the pipe.

[0054] The limit protrusion 402 of the inner flap die driving part of the present invention can contact the lower surface of the base when the inner flap die driving part moves upward to the maximum distance, avoiding the continuous upward movement of the inner flap die driving part, thereby preventing the inner flap die 300 from being extruded and deformed due to the continuous upward movement of the inner flap die driving part, and also preventing the rotation of the inner flap die driving part. At the same time, the guiding cylinder can allow the inner flap die driving part to move on the vertical axis passing through the center of the cylinder formed by the multiple inner flap dies, avoiding the uneven force on the inner die caused by the skewed movement direction of the inner flap die driving part, resulting in extrusion deformation, and also avoiding the uneven formation of the protrusion S of the pipe joint.

[0055] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0056] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be construed as a limitation of the present invention. After those skilled in the art have read the above content, various modifications and alternatives to the present invention will be obvious. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. A pipe joint forming die, characterized in that Comprising: A base, with an opening provided in the middle of the base; An outer mold, which is placed on the upper surface of the base and is used to apply stress to the outer surface of the pipe; A plurality of inner flap molds, which form a cylinder. There is a through hole in the middle of the cylinder, and the through hole is conical; the plurality of inner flap molds are arranged in the opening of the base and can move limitedly along the radial direction of the opening, and are used to apply stress to the inner surface of the pipe to cooperate with the outer mold to form the pipe joint; An inner flap mold driving part, which includes a cone, a guiding part and a limiting projection. The cone is connected to the guiding part. There are two limiting projections, which are respectively arranged on both sides of the bottom of the cone. The limiting projections just touch the lower surface of the base when the inner flap mold driving part reaches the maximum moving distance, thereby preventing the inner flap mold driving part from continuing to move; A guiding cylinder, which is arranged on the lower surface of the base. The guiding cylinder includes a guiding hole, and the guiding hole cooperates with the guiding part and the limiting projection to ensure the moving direction of the inner flap mold driving part; Among them, a part of the inner flap mold driving part is arranged in the through hole, and the cone cooperates with the through hole. By moving the inner flap mold driving part, the plurality of inner flap molds are driven to move limitedly along the radial direction of the opening; It further includes a gasket ring, which is arranged on the circumference of the cylinder formed by the plurality of inner flap molds and is used to cover the shaping part on the circumference of the cylinder formed by the plurality of inner flap molds; a positioning hole is arranged at the corresponding shaping part of one inner flap mold, a positioning pin is arranged on the inner surface of the gasket ring, the positioning hole and the positioning pin are in adapted shapes, the positioning hole is non-circular, and the gasket ring is also provided with a notch to form a breakable ring.

2. The pipe joint forming die according to claim 1, wherein The guiding hole is a round hole, and the guiding part is cylindrical; the round hole cooperates with the cylindrical guiding part, and the other part of the inner flap mold driving part is placed in the round hole and can move relative to the round hole.

3. The pipe joint forming die according to claim 2, characterized in that Limiting grooves extending along the axial direction of the guiding cylinder are arranged on both sides of the round hole, and the limiting grooves cooperate with the limiting projections.

4. The pipe joint forming die according to claim 1, wherein, The base includes an upper substrate and a lower substrate. The upper substrate is provided with an opening, and the lower substrate is provided with an opening. The openings are both circular. The diameter of the opening of the upper substrate is larger than the diameter of the opening of the lower substrate.

5. The pipe joint forming die according to claim 4, wherein, Steps are arranged around the opening on the upper surface of the lower substrate to form an annular clamping part between the lower surface of the upper substrate and the upper surface of the lower substrate.

6. The pipe joint forming die according to claim 5, characterized in that, An annular groove extending along the circumference is arranged on the surface of the cylinder, and the annular groove cooperates with the upper substrate; an annular base is formed below the annular groove.

7. The pipe joint forming die according to claim 6, characterized in that, The annular base is placed in the annular clamping part, and the annular base cooperates with the annular clamping part.

8. The pipe joint forming die according to claim 1, characterized in that, There are two outer molds, the outer molds are in a clamp shape, and the surface of the clamp shape facing the inner flap mold is semi-circular.

9. The pipe joint forming die according to any one of claims 4-7, characterized in that, A receiving ring groove is arranged on the upper surface of the upper substrate corresponding to the position of the pipe joint, and the receiving ring groove is used to receive the pipe joint.

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