Pipe expansion die and pipe expansion equipment

Abstract

The present invention discloses a pipe expansion die and a pipe expansion device. The pipe expansion die includes an expansion seat, an expansion assembly, and an elastic beam ring. The expansion seat is provided with a receiving groove; the expansion assembly includes an elastic beam ring, a plurality of movable members, and a plurality of fixed members. The plurality of fixed members are fixedly arranged in the expansion seat, the plurality of fixed members are arranged at intervals and distributed in a ring shape; the elastic beam ring is located in the receiving groove and elastically deforms along the radial direction of the receiving groove. The elastic beam ring has an expansion hole; the movable members and the fixed members are matched with each other and are both arranged in the expansion hole. The movable member has an outer diameter end in contact with the elastic beam ring and an inner diameter end far from the outer diameter end. Each movable member is located between two adjacent fixed members and can slide and displace along the radial direction of the elastic beam ring. The pipe expansion die of the present invention can improve the stability of pipe expansion.

Description

Technical Field

[0001] The invention relates to the technical field of pipe processing equipment, and in particular to a pipe expansion die and a pipe expansion equipment. Background Art

[0002] When processing cold shrink tubes and other pipes, they often need to go through a process of expansion and expansion so that the pipes can be socketed and assembled with other structural parts.

[0003] In the related art, the tube to be expanded is placed in the expansion cavity of the mold. The volume of the expansion cavity is constant, and the wall of the expansion cavity strictly limits the expansion degree of the tube to be expanded. When the tube to be expanded fits with the wall of the expansion cavity, the tube to be expanded cannot undergo adaptive elastic deformation, resulting in local compression and distortion when the tube continues to expand, affecting the stability and expansion effect of the tube expansion. Summary of the invention

[0004] The main purpose of the present invention is to provide a tube expansion die, aiming to improve the stability of tube expansion.

[0005] To achieve the above object, the present invention provides a tube expansion die, the tube expansion die comprising:

[0006] An expansion seat having a central cavity, wherein the expansion seat is provided with a receiving groove; and

[0007] An expansion assembly, the expansion assembly comprising an elastic collar, a plurality of movable parts and a plurality of fixed parts, the plurality of fixed parts being fixedly disposed in the expansion seat, the plurality of fixed parts being arranged at intervals and distributed in a ring shape around the central cavity;

[0008] The elastic collar is located in the accommodating groove, elastically deforms along the radial direction of the accommodating groove and is arranged on the radial outer peripheral side of the movable part;

[0009] The movable part matches and contacts the fixed part, and the movable part has an outer diameter end that contacts the elastic ring and an inner diameter end away from the outer diameter end. Each movable part is located between two adjacent fixed parts and can slide and displace along the radial direction of the elastic ring.

[0010] In one embodiment of the present invention, the circumferential width of each of the movable members gradually increases along the radial direction of the elastic ring, and the movable member includes a connecting portion and a supporting portion;

[0011] The support portion is arranged on a side of the connection portion away from the elastic collar, and the support portion encloses and forms an expansion port;

[0012] A spacing space is formed between two adjacent supporting parts, and each of the fixing members is located in the spacing space and is slidably abutted against the supporting part.

[0013] In an embodiment of the present invention, a first step structure is provided on the outer side wall of the support portion;

[0014] Second step structures are provided on two outer side walls of the fixing member, and the second step structures are in contact with the first step structures to limit the movable member.

[0015] In an embodiment of the present invention, when the second step structure is not in contact with the first step structure, a slit is formed between the inner diameter ends of two adjacent movable members.

[0016] In an embodiment of the present invention, the pipe expansion die further includes an expansion cavity communicating with the expansion seat. The expansion cavity includes a cylindrical body, an expansion channel located in the central region of the cylindrical body, and an air inlet hole and an air extraction hole provided on the cylindrical body and communicating with the expansion channel.

[0017] In an embodiment of the present invention, a plurality of air gap channels arranged at intervals around the expansion channel are provided in the cylindrical body, and the air inlet hole and the air extraction hole communicate with the expansion channel through the air gap channels.

[0018] In an embodiment of the present invention, the material of the elastic beam ring is one of rubber and silica gel;

[0019] And / or, the material of the movable member is stainless steel.

[0020] In an embodiment of the present invention, the expansion seat includes a cover plate and a ring seat;

[0021] The cover plate is provided at one end of the ring seat and encloses the accommodating groove with the ring seat.

[0022] In an embodiment of the present invention, the expansion die further includes a conveying seat;

[0023] The conveying seat is located between the expansion seat and the expansion cavity, and the conveying seat is provided with a conveying cavity communicating with the expansion hole and the expansion channel.

[0024] In addition, the present invention also provides a pipe expansion device, and the pipe expansion device includes the pipe expansion die as described above.

[0025] The pipe expansion die in the present invention includes an expansion base and an expansion assembly. The pipe expansion die includes an expansion base, an expansion assembly and an elastic restraint ring. The expansion base is provided with a receiving groove; the expansion assembly includes an elastic restraint ring, a plurality of movable members and a plurality of fixed members. The plurality of fixed members are fixedly arranged in the expansion base, and the plurality of fixed members are spaced apart and distributed in a ring shape; the elastic restraint ring is located in the receiving groove and elastically deforms radially. The elastic restraint ring has an expansion hole; the movable members and the fixed members are matched and are both arranged in the expansion hole. The movable members have an outer diameter end in contact with the elastic restraint ring and an inner diameter end away from the outer diameter end. Each movable member is located between two adjacent fixed members and can slide radially along the elastic restraint ring. In this way, when the pipe to be expanded is fed into the receiving groove, the pipe to be expanded passes through the expansion hole and enters between the inner diameter ends of the plurality of movable members. When the pipe to be expanded expands, the pipe to be expanded abuts against and presses the plurality of movable members. With the support of each fixed member for the two adjacent movable members, the plurality of movable members slide outward relative to the plurality of fixed members. The plurality of movable members are constrained by the elastic restraint ring, so that the elastic restraint ring generates an adaptive elastic deformation with the expansion of the pipe to be expanded. At the same time, the elastic restraint ring elastically wraps and restrains the movement of the plurality of movable members, making the expansion of the pipe balanced and stable, and improving the stability of the pipe expansion. Brief Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0027] Figure 1 It is a partial structural schematic diagram of a pipe expansion device;

[0028] Figure 2 It is a three-dimensional structural schematic diagram of the pipe expansion die of the present invention;

[0029] Figure 3 It is Figure 2 a partial cross-sectional projection schematic diagram of the pipe expansion die shown in

[0030] Figure 4 It is an exploded structural schematic diagram of the pipe expansion die of the present invention;

[0031] Figure 5 It is Figure 2 a structural schematic diagram of the fitting of the movable member and the fixed member in the initial state in

[0032] Figure 6 It is Figure 5 a structural schematic diagram when the movable member slides and displaces in

[0033] Figure 7 is Figure 2 a schematic structural diagram of the movable part in

[0034] Figure 8 is Figure 2 a schematic structural diagram of the fixed part in

[0035] Explanation of the reference numerals in the drawings:

[0036] Label Name Label Name 1 Expansion seat 221 Expansion aperture 11 Cover plate 222 Connection part 111 Positioning hole 223 Support part 112 Feeding hole 2231 First step structure 12 Ring seat 224 Spacer 2 Expansion assembly 23 Fastener 21 Elastic retaining ring 231 Second step structure 211 Expansion hole 3 Delivery seat 212 Positioning part 31 Delivery cavity 22 Movable part Specific implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0038] The present invention provides a pipe expansion mold for expanding heat-shrinkable or cold-shrinkable pipes.

[0039] The present invention provides a pipe expansion mold, as Figures 1 to 8 shown, the pipe expansion mold includes an expansion base 1 and an expansion assembly 2. The expansion base 1 is provided with a receiving groove; the expansion assembly 2 includes an elastic binding ring 21, a plurality of movable parts 22 and a plurality of fixed parts 23. The plurality of fixed parts 23 are fixedly arranged in the expansion base 1 and are spaced apart and distributed in a ring shape; the elastic binding ring 21 is elastically deformed radially in the receiving groove, and the elastic binding ring 21 has an expansion hole 211; the movable parts 22 and the fixed parts 23 are matched and abutted, and are both arranged in the expansion hole 211 and are constrained by the elastic binding ring 21. The movable parts 22 have an outer diameter end abutting against the elastic binding ring 21 and an inner diameter end away from the outer diameter end. Each movable part 22 is located between two adjacent fixed parts 23 and can slide radially along the elastic binding ring 21.

[0040] In this embodiment, the receiving cavity of the expansion base 1 is used to install the elastic binding ring 21 and the movable parts 22. The material of the expansion base 1 can be a metal material, such as stainless steel, etc., so that the expansion base 1 has good structural strength, improves the structural stability of the expansion base 1, limits the maximum expansion degree of the pipe, ensures the reliability of the pipe expansion, and also enables the expansion base 1 to have a long service life. The receiving groove is a concave cavity on the expansion base 1 for receiving the elastic binding ring 21.

[0041] The elastic beam ring 21 is used to limit the sliding displacement range of multiple movable parts 22. The elastic beam ring 21 is clamped between multiple movable parts 22 and the side wall of the accommodating groove. The material of the elastic beam ring 21 can be elastic materials such as rubber and silica gel. The shape of the elastic beam ring 21 can be annular to match the outer shape of the pipe. One side of the elastic beam ring 21 facing the movable part 22 abuts against the movable part 22, and multiple movable parts 22 simultaneously abut against the elastic beam ring 21. The elastic beam ring 21 can always be in an elastically stretched state, that is, the elastic beam ring 21 can always exert an elastic pressure on multiple movable parts 22, so that multiple movable parts 22 always clamp and position the pipe in the expansion port 221. When the elastic member is always in an elastically stretched state, the inner diameter ends of multiple movable parts 22 enclose to form an expansion port 221, and the minimum channel diameter of the expansion port 221 is equal to or slightly larger than the diameter of the pipe to be expanded, so that the pipe to be expanded can smoothly enter the expansion port 221.

[0042] The movable part 22 is used to restrain the tube blank and the elastic beam ring 21. The length of the movable part 22 in the radial direction of the expansion hole 211 is greater than the length of the fixed part 23 in the radial direction of the expansion hole 211. Multiple movable parts 22 and multiple fixed parts 23 can be arranged in a ring in sequence. The movable parts 22 and the fixed parts 23 are arranged alternately. There is a fixed part 23 between every two adjacent movable parts 22, and there is a movable part 22 between every two adjacent fixed parts 23. The adjacent movable part 22 and the fixed part 23 can slide relative to each other. When the pipe to be expanded passes through and expands in the expansion port 221 formed by enclosing multiple movable parts 22, the pipe to be expanded squeezes and pushes multiple movable parts 22, so that the slit 2210 between any two adjacent movable parts 22 expands, and the fixed part 23 does not displace relative to the two adjacent movable parts 22. During this process, the fixed part 23 always remains in contact with the two adjacent movable parts 22, but the contact area between the fixed part 23 and the two adjacent movable parts 22 gradually decreases. With the support of multiple fixed parts 23 for the two adjacent movable parts 22, the stability of the movement of multiple movable parts 22 can be maintained, which is beneficial to improving the uniformity and reliability of the expansion of the pipe to be expanded. The movable part 22 can be a wedge-shaped or T-shaped structure. The cross-sectional shape of the expansion port 221 formed by enclosing the inner diameter ends of multiple movable parts 22 can be circular to match the outer shape of the pipe. When the pipe to be expanded expands, multiple movable parts 22 simultaneously move towards the elastic beam ring 21, so that the forces on each part of the elastic beam ring 21 are uniform, ensuring uniform expansion of each part of the pipe to be expanded. The material of the movable part 22 can be a heat-resistant hard material, such as stainless steel, etc.

[0043] When this pipe expansion mold is in use, the pipe to be expanded is pushed into the expansion port 221 formed by enclosing the inner diameter ends of multiple movable parts 22. The pipe to be expanded is expanded by inflation. The pipe to be expanded pushes the multiple movable parts 22 to move towards the elastic beam ring 21. The multiple movable parts 22 abut against and push the elastic beam ring 21 to move towards the side wall of the accommodating groove. The elastic beam ring 21 generates an adaptive elastic deformation as the pipe expands. At the same time, the elastic beam ring 21 elastically restricts the expansion degree of the expanded pipe through the multiple movable parts 22, realizing uniform and stable expansion of the pipe.

[0044] During the production process, the pipe raw material is added into the extruder. After being melted and plasticized in the extruder, it is extruded into a pipe blank 900. The pipe blank is cooled and insulated in the high elastic state in the pipe blank insulation section, and then heated to the stretchable temperature range in the high elastic state in the oil tank 200 of the biaxial stretching die. Under the traction force of the tractor 300 and the vacuum adsorption force of the expansion die 100, the biaxial stretching device realizes radial and / or axial stretching of the embryo pipe. In the technical solution of this embodiment, after the pipe blank 900 enters from the feeding hole 112 of the expansion seat 1 at the front end 101 of the expansion die 100 of the expansion die 100, it enters the expansion cavity 102 for the expansion process. That is, while inflating the inside of the pipe blank 900 for expansion, a "vacuum" is also drawn on the outside of the pipe blank 900 to form a negative pressure to further expand the pipe blank 900. In order to prevent air leakage at both ends of the pipe expansion mold and unable to form negative pressure stretching, end-side sealing treatment is required. That is, under the elastic binding force of the elastic beam ring 21, the multiple movable parts 22 of the expansion assembly 2 will be elastically and adaptively tightened around the outer wall of the pipe blank 900 to be processed. Then, the pipe blank part located towards the output port of the expansion channel of the elastic beam ring 21 is in a closed airtight environment. The pipe blank 900 expands in the state of internal inflation. Its own deformation will cause the movable part 22 to displace outward in the circumferential direction. And the movable part 22 will undergo a small amount of displacement appropriately under the constraint of the elastic beam ring 21 on the outer circumference. When the inflation expansion of the pipe blank 900 reaches equilibrium and stability, the sliding displacement range of the movable part 22 will reach stability. At this time, the movable part 22 is adaptively tightened around the outer wall of the pipe blank. However, the pipe blank is to move and displace. The so-called tight binding here does not completely block the pipe blank, but achieves a balance with the pipe blank. Specifically: taking the position where the movable part 22 restricts the pipe blank as the demarcation line, when the negative pressure on the right side is significantly greater than the pressure on the left side, it will force the movable part 22 to adaptively adjust the displacement range compared with the previous state, so that a larger amount of the left-side trace gas enters the right side of the demarcation line through the slit 2210 formed between the inner diameter ends of two adjacent movable parts 22 than before; when the negative pressure on the right side is significantly less than the pressure on the left side, the movable part 22 adaptively adjusts its own position to reduce the air permeability of the slit 2210 to reach a new balance. At the same time, the pipe blank continues to move under the action of the tractor 300 to realize moving expansion.

[0045] In an embodiment of the present invention, as Figure 1As shown, the circumferential width of each movable member 22 gradually increases along the radial direction of the elastic binding ring 21. The movable member 22 includes a connecting portion 222 and a supporting portion 223. The supporting portion 223 is provided on the side of the connecting portion 222 facing away from the elastic binding ring 21. A plurality of supporting portions 223 enclose to form an expansion opening 221. An interval space 224 is formed between two adjacent supporting portions 223. Each fixing member 23 is located in the interval space 224 and is in sliding contact with the supporting portion 223.

[0046] In this embodiment, the supporting portion 223 and the connecting portion 222 may be an integrally formed structure. The supporting portion 223 and the connecting portion 222 may be strip-shaped structures. The supporting portion 223 and the connecting portion 222 may be arranged at an angle. For example, the overall shape formed by the connection and combination of the supporting portion 223 and the connecting portion 222 may be in the shape of the letter "T". Two adjacent connecting portions 222 are in contact with each other. An interval space 224 is formed between two adjacent supporting portions 223. When the pipe in the expansion opening 221 expands, any two adjacent connecting portions 222 can always maintain the position relationship of being in contact with each other under the elastic constraint of the elastic binding ring 21, while the supporting portion 223 will move, so that the interval space 224 between any two adjacent supporting portions 223 becomes larger, so that the movable member 22 can move adaptively with the expansion of the pipe. At this time, the fixing member 23 between two adjacent movable members 22 moves with the movement of the movable member 22. The movable member 22 always at least partially contacts its two adjacent movable members 22, provides support for these two movable members 22, and maintains the stability of the movement of these two movable members 22. The elastic binding ring 21 will also correspondingly generate an adaptive elastic deformation with the movement of a plurality of movable members 22. The setting of the interval space 224 provides space for the movement of the movable member 22 and the fixing member 23, which is beneficial to improving the stability of the movement of a plurality of movable members 22 and realizing the stable expansion of the pipe.

[0047] In an embodiment of the present invention, in combination with Figure 1 and Figure 2 As shown, first step structures 2231 are provided on the two outer side walls of the supporting portion 223. Second step structures 231 are provided on the opposite two outer side walls of the fixing member 23. Each second step structure 231 abuts against a first step structure 2231 to limit the movable member 22.

[0048] In this embodiment, the second stepped structure 231 and the first stepped structure 2231 have two states: abutting and non-abutting. When the second stepped structure 231 does not abut against the first stepped structure 2231, a slit 2210 is formed between the inner diameter ends of two adjacent movable members 22, and the slit 2210 is a gap formed between the inner diameter ends of two adjacent movable members 22. When the second stepped structure 231 abuts against the first stepped structure 2231, a coplanar surface is formed by the end of the support portion 223 of the movable member 22 and the end of the fixing member 23 away from the elastic beam ring 21 when the end faces of the support portion 223 away from the elastic beam ring 21 and the end face of the fixing member 23 away from the elastic beam ring 21 are flush.

[0049] First stepped structures 2231 are provided on opposite sides of the support portion 223, and each first stepped structure 2231 is located in a spaced space 224. Second stepped structures 231 are provided on opposite side walls of the fixing member 23, and the two second stepped structures 231 on the fixing member 23 respectively abut against the two first stepped structures 2231 located in the spaced space 224. At least a part of the opposite outer side walls of each fixing member 23 abut against the support portions 223 of the two adjacent movable members 22 adjacent to the fixing member 23, so that when the support portions of two adjacent movable members 22 move away from each other due to the expansion of the pipe, through the abutting and limiting cooperation of the first stepped structure 2231 and the second stepped structure 231, and through the fixing member 23 therebetween to support and maintain the movement stability, so that when the support portion 223 moves with the expansion of the pipe, the connecting portion 222 is driven to squeeze the elastic beam ring 21, causing the elastic beam ring 21 to undergo elastic deformation, and the pipe is expanded. After the expanded pipe is transferred out of the pipe expansion die, the elastic beam ring 21 elastically returns to its original state, and the plurality of movable members 22 gather under the action of the elastic beam ring 21, and two adjacent movable members 22 re-clamp a fixing member 23. The arrangement of the first stepped structure 2231 and the second stepped structure 231 makes the limiting cooperation between two adjacent movable members 22 and the fixing member 23 therebetween closer and more reliable, which is beneficial to improving the reliability of pipe expansion.

[0050] In an embodiment of the present invention, as Figure 1 shown, the cross-sectional area of each movable member 22 at the end close to the elastic beam ring 21 is larger than the cross-sectional area of the movable member 22 at the end away from the elastic beam ring 21.

[0051] In this embodiment, the cross-sectional area of the movable member 22 near one end of the elastic beam ring 21 is larger than the cross-sectional area of the movable member 22 far from the elastic beam ring 21. For example, the shape of the movable member 22 can be wedge-shaped. In this way, a section of the movable member 22 facing the elastic beam ring 21 has a large contact area with the elastic beam ring 21, which can improve the tightness and reliability of the cooperation between the movable member 22 and the elastic beam ring 21; the cross-sectional area of the end of the movable member 22 far from the elastic beam ring 21 is small, and the end of the movable member 22 far from the elastic beam ring 21 can exert a sufficient large pressure on the pipe to be expanded in the expansion port 221, ensuring the stable and reliable abutting fit between the elastic beam ring 21 and the pipe to be expanded. When the pipe to be expanded expands, the movable member 22 can move immediately and drive the elastic beam ring 21 to generate an adaptive deformation, improving the timeliness and stability of the expansion of the pipe to be expanded.

[0052] In this embodiment, the pipe expansion die 100 further includes an expansion cavity 102 communicating with the expansion seat 1. The expansion cavity 102 includes a cylindrical body, an expansion channel 102d located in the central area within the cylindrical body, and an air inlet hole 102a and an air extraction hole 102b arranged on the cylindrical body and communicating with the expansion channel 102d. The tube blank 900 is output from the expansion channel 102d. A plurality of air gap channels 102c arranged at intervals are further provided in the cylindrical body around the expansion channel 102d. The air inlet hole 102a and the air extraction hole 102b communicate with the expansion channel 102d through the air gap channels 102c. When the tube blank 900 is in the expansion cavity 102, a gas film will be formed between the outer wall of the tube blank 900 and the inner wall of the expansion cavity 102 to prevent the tube blank 900 from sticking in the expansion cavity 102. The air flow rate of the air extraction hole 102b is greater than the air flow rate of the air inlet hole 102a. The negative pressure of the expansion channel 102d is adjusted through the air inlet hole 102a and the air extraction hole 102b, and the gas located on the outer peripheral side of the outer wall of the tube blank 900 is extracted through the air gap channels 102c. The air gap channels 102c are arranged at equal intervals. In addition, an air passage 102e communicating adjacent air gap channels 102c is further provided in the cylindrical body, and the air passage 102e is arranged in a direction away from the expansion channel 102d. In this embodiment, the channel spacing of the air gap channels 102c adjacent to the tube blank 900 is very small, and the elastic tube wall will not be sucked into the air gap channels 102c. In this embodiment, the air gap channels 102c are in the form of annular gap sheets surrounding the expansion channel 102d. Of course, the air gap channels 102c can also be designed as a plurality of through holes arranged in an array.

[0053] In an embodiment of the present invention, as Figure 1 shown, a positioning hole 111 is provided on the bottom wall of the receiving groove; the elastic beam ring 21 is provided with a positioning portion 212, and at least a part of the positioning portion 212 is received and limited in the positioning hole 111.

[0054] In this embodiment, when the elastic beam ring 21 is located in the accommodating cavity, the positioning portion 212 on the elastic beam ring 21 is received and limited within the positioning hole 111, so that the elastic beam ring 21 is positioned within the accommodating cavity, preventing the elastic beam ring 21 from moving within the accommodating groove when undergoing elastic deformation, and ensuring the stability of the expansion of the pipe. Among them, the positioning portion 212 can be a convex structure on the elastic beam ring 21. The positioning portion 212 can be integrally formed with the elastic beam ring 21, and the elastic beam ring 21 can also be made of an elastic material, so that when the elastic beam ring 21 undergoes elastic deformation, the positioning portion 212 can correspondingly generate a certain amount of elastic deformation to allow the elastic beam ring to generate adaptive elastic deformation along with the expansion of the pipe, ensuring the timeliness and reliability of the pipe expansion.

[0055] In an embodiment of the present invention, as Figure 1 shown, the expansion seat 1 is provided with a feeding hole 112, and the feeding hole 112 is coaxially arranged and communicated with the expansion port 221.

[0056] In this embodiment, the feeding hole 112 is used for the pipe to be expanded to enter the accommodating groove and the expansion port 221. The aperture of the feeding hole 112 can be slightly larger than the pipe to be expanded. In this way, the pipe to be expanded can be fed into the pipe expansion mold through the feeding hole 112.

[0057] In an embodiment of the present invention, as Figure 1 shown, the material of the elastic beam ring 21 is one of rubber and silica gel; and / or, the material of the movable member 22 is stainless steel.

[0058] In this embodiment, rubber and silica gel materials are easy to obtain and have a certain elasticity, which can well restrain the pipe during expansion. At the same time, the structures of rubber and silica gel are stable, corrosion-resistant, and have a long service life, which is beneficial to reducing the damage and replacement frequency of the elastic beam ring 21 and improving the service life of the pipe expansion mold.

[0059] Stainless steel material has the characteristics of not being easy to rust and having high structural strength. When the movable member 22 is made of stainless steel material, it can improve the structural rigidity of the movable member 22, enabling the movable member 22 to move in a timely manner when the pipe to be expanded expands, driving the elastic beam ring 21 to generate corresponding deformation, and at the same time, the movable member 22 also has a long service life.

[0060] In an embodiment of the present invention, as Figure 1 shown, the expansion seat 1 includes a cover plate 11 and a ring seat 12; the cover plate 11 is provided at one end of the ring seat 12 and encloses with the ring seat 12 to form an accommodating groove. In an embodiment of the present invention, the expansion mold further includes a conveying seat 3; the conveying seat 3 is located between the expansion seat 1 and the expansion cavity 102, and the conveying seat 3 is provided with a conveying cavity 31 communicated with the expansion hole 211 and the expansion channel 102d.

[0061] In this embodiment, the cover plate 11 and the ring base 12 can be detachably connected by means of snap connection, plug connection or other cooperation methods, or can be connected by means of screw connection, bonding or other methods. The ring base 12 is of an annular structure, and the cover plate 11 is covered at the port at one end of the ring base 12 and encloses a receiving groove with the ring base 12.

[0062] The conveying seat 3 is used to transfer the expanded pipe in the expansion port 221 to the next-level processing procedure. The conveying seat 3 can be connected to the expansion seat 1 by means of screw connection or the like. The pipe after the expansion procedure enters the conveying cavity 31 from the expansion port 221 and is transferred to the next-level processing procedure through the conveying cavity 31, realizing the uninterrupted expansion and conveying of multiple pipes, which is beneficial to improving the expansion processing efficiency of batch pipes. The material of the conveying seat 3 can be a metal material, such as stainless steel, etc., so that the conveying seat 3 has high structural strength, improves the shape stability and durability of the conveying seat 3, and ensures that the conveying seat 3 can stably convey the expanded pipe. The conveying cavity 31 can be a cavity structure penetrating through the conveying seat 3, and the conveying cavity 31 can be a cylindrical cavity to be adapted to the circular pipe and reliably convey the circular pipe.

[0063] In addition, the present invention also proposes a pipe expansion device, and the pipe expansion device includes the above-mentioned pipe expansion die.

[0064] In this embodiment, the pipe expansion device of the present invention can include the pipe expansion die and the preheating device in the above embodiment. The preheating device is located on the side of the expansion seat 1 facing away from the conveying seat 3, and the preheating device is used to heat the pipe to make the pipe easy to expand and form.

[0065] It is worth pointing out that the pipe expansion device of the present invention adopts all the technical solutions of the above-mentioned all embodiments, so it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one.

[0066] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the description and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A pipe expansion die, characterized in that, The pipe expansion die includes: An expansion base having a middle cavity, the expansion base being provided with a receiving groove; and an expansion assembly, the expansion assembly including an elastic beam ring, a plurality of movable members, and a plurality of fixed members. The plurality of fixed members are fixedly arranged in the expansion base, the plurality of fixed members are spaced apart, and are annularly distributed around the middle cavity; the inner diameter ends of the plurality of movable members enclose an expansion opening, and the pipe to be expanded is pushed into the expansion opening for expansion. The elastic beam ring is located in the receiving groove, elastically deforms along the radial direction of the receiving groove, and is arranged on the outer peripheral side of the radial direction of the movable member. The movable member and the fixed member are matched and abutted. The movable member has an outer diameter end abutting against the elastic beam ring and an inner diameter end away from the outer diameter end. Each movable member is located between two adjacent fixed members and is slidable in the radial direction of the elastic beam ring.

2. The pipe expansion die according to claim 1, characterized in that , The movable member includes a connecting portion and a supporting portion; The supporting portion is arranged on a side of the connecting portion facing away from the elastic beam ring, and the supporting portion encloses an expansion opening; An interval space is formed between two adjacent supporting portions, and each fixed member is located in the interval space.

3. The pipe expansion die according to claim 2, wherein , A first step structure is provided on an outer side wall of the supporting portion; Second step structures are provided on two outer side walls of the fixed member, and the second step structure abuts against the first step structure to limit the movable member.

4. The pipe expansion die according to claim 3, characterized in that , When the second step structure does not abut against the first step structure, a slit is formed between the inner diameter ends of two adjacent movable members.

5. The pipe expansion die according to claim 1, characterized in that , The pipe expansion die further includes an expansion cavity communicating with the expansion base. The expansion cavity includes a cylindrical body, an expansion channel located in a central area inside the cylindrical body, and an air inlet hole and an air extraction hole arranged on the cylindrical body and communicating with the expansion channel.

6. The pipe expansion die according to claim 5, characterized in that , A plurality of air gap channels arranged at intervals around the expansion channel are provided inside the cylindrical body, and the air inlet hole and the air extraction hole communicate with the expansion channel through the air gap channels.

7. The pipe expansion die according to claim 6, wherein , An air duct communicating adjacent air gap channels is further provided inside the cylindrical body, and the air duct is arranged in a direction away from the expansion channel.

8. The pipe expansion die according to claim 1, characterized in that , The expansion base includes a cover plate and a ring base; the cover plate is arranged at one end of the ring base and encloses the receiving groove with the ring base.

9. The pipe expansion die according to any one of claims 1 to 8, characterized in that , The expansion die further includes a conveying base; the conveying base is located between the expansion base and the expansion cavity, and the conveying base is provided with a conveying cavity communicating with the expansion hole and the expansion channel.

10. A pipe expansion device, characterized in that , The pipe expansion device includes the pipe expansion die according to any one of claims 1 to 9.

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