Pipe flaring device

Abstract

The utility model relates to the technical field of pipe machining, in particular to a pipe flaring device which comprises a first die, a second die, a first driving assembly and a second driving assembly, the interior of the first die is of a hollow structure, and a guide groove penetrating through the outer wall face of the first die is formed in the inner wall face of the first die in the axial direction. The second mold is contained in the hollow structure, a forming rib matched with the guide groove in position is arranged on the peripheral face of the second mold, the forming rib is in sliding connection with the guide groove, and the forming rib is exposed out of the outer wall face of the first mold; the first driving assembly is connected with the first mold so as to drive the first mold to move in the axial direction. The second driving assembly is connected with the second die so as to drive the second die to move in the axial direction. By the adoption of the device, the flaring pipe with the outwards-protruding groove can be produced.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe processing, and more specifically, to a pipe expanding device. Background Art

[0002] PVC wire pipes are widely used in various fields due to their excellent physical properties, corrosion resistance, insulation and relatively low cost. In some cases, it is necessary to connect pipes to pipes, and pipe joints and adhesives are usually used for connection. In order to improve the sealing of the pipe joints, Chinese patent announcement number CN201526769U discloses a PVC pipe joint, which has an outwardly protruding groove on the inner wall near the edge. The groove is used to accommodate the adhesive. After the pipe is inserted, the adhesive is squeezed to the bottom of the interface, which can prevent the adhesive from overflowing during connection, maintain the bonding strength, and thus improve the sealing of the connection.

[0003] To manufacture these pipe joints, a device is required to expand the pipe opening and further process the expanded opening to form an outward-protruding groove. However, due to the unique groove structure of these pipe joints, it is difficult to form them online using existing equipment. Therefore, a new device needs to be designed to facilitate the production of pipes with this structure. Utility Model Content

[0004] In order to overcome the problem in the prior art that expanded pipes and pipe joints with grooves are difficult to produce, the utility model provides a pipe expanding device to facilitate the production of the above-mentioned pipes.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a pipe expanding device, comprising a first mold, a second mold, a first drive assembly and a second drive assembly, the interior of the first mold is a hollow structure, and a guide groove is axially opened on the inner wall surface of the first mold and penetrates the outer wall surface of the first mold, the second mold is accommodated in the hollow structure, and a forming rib adapted to the position of the guide groove is provided on the outer peripheral surface of the second mold, the forming rib is slidably connected to the guide groove, and the forming rib is exposed on the outer wall surface of the first mold; the first drive assembly is connected to the first mold to drive the first mold to move axially; the second drive assembly is connected to the second mold to drive the second mold to move axially.

[0006] In the technical solution of this utility model, a first drive assembly drives the first die to expand the pipe, causing the end of the pipe to expand and fit into the first die. Then, a second drive assembly drives the second die into the hollow structure of the first die, simultaneously with the forming ribs entering the guide grooves. Because the forming ribs are exposed on the outer wall of the first die, they can extend and contact the pipe, thus performing a second expansion of the pipe, further forming an outwardly protruding groove at the expanded portion of the pipe. This device can produce expanded pipes with grooves.

[0007] In the prior art, pipe expansion devices typically utilize a single mold, performing a single expansion process. However, the inventors discovered that using a mold with ribs on the outer periphery to produce expanded, grooved pipes in a single process can result in reduced product quality. More specifically, during pipe expansion, the pipe's rim must be heated to a certain temperature and softened to achieve good plasticity. Using a mold with ribs for single-process expansion can easily result in the formation of raised vertical lines on the pipe surface, reducing the product's appearance. Furthermore, the presence of these ribs on the mold surface increases expansion resistance, making the pipe susceptible to deformation and folding, making stable expansion difficult. Therefore, the inventors designed the present pipe expansion device, which utilizes a first mold and a second mold for separate expansion. The first mold lacks ribs, resulting in low expansion resistance and providing the initial expansion. The second mold, which utilizes ribs to perform a secondary expansion process to form the grooves, provides a sufficient degree of strength on the outer surface of the expanded portion of the pipe, ensuring stable production and a high-quality appearance.

[0008] Furthermore, the second drive assembly is axially slidably connected to the first drive assembly, and further comprises an elastic connector arranged axially, wherein two ends of the elastic connector are respectively connected to the first drive assembly and the second drive assembly.

[0009] In the above technical solution, an elastic connector connects the first and second drive assemblies. When the second drive assembly and the second die are moved toward the pipe, the elastic connector drives the first drive assembly and the first die toward the pipe. Positioning the first die closer to the pipe allows it to contact the pipe first for primary flaring. After the primary flaring is complete, the second drive assembly moves further toward the pipe for secondary flaring. This solution only requires the second drive assembly to complete both primary and secondary flaring, reducing the number of external drive components required.

[0010] Furthermore, the first driving assembly includes a front template, a rear template and a guide column, the two ends of the guide column are respectively fixedly connected to the front template and the rear template, the first mold is connected to the front template, and the front template is provided with a first through hole connecting to the hollow structure, the second mold passes through the first through hole, and the second driving assembly is slidably connected to the guide column.

[0011] In the above technical solution, the front template, the rear template and the guide column are connected so that the second drive assembly is slidably connected to the first drive assembly, and the first mold is connected to the front template, which is convenient for assembly.

[0012] Furthermore, the second driving assembly includes a push rod and a push plate, the push rod is fixedly connected to the push plate, the push plate is slidably connected to the guide column, the second mold is connected to the side of the push plate facing the first mold, the rear mold plate is provided with a second through hole, and the push rod is slidably installed through the second through hole.

[0013] In the above technical solution, the second mold is connected to the push plate, and the push plate can be pushed to move by the push rod, thereby moving the second mold. A second through hole is opened on the rear template, and the push rod passes through the second through hole to facilitate connection with an external driving member.

[0014] Furthermore, the elastic connecting member is a compression spring, one end of the elastic connecting member is in contact with or fixedly connected to the push plate, and the other end of the elastic connecting member is in contact with or fixedly connected to the front template.

[0015] Furthermore, the elastic connecting member is a tension spring, one end of the elastic connecting member is fixedly connected to the push plate, and the other end of the elastic connecting member is fixedly connected to the rear template.

[0016] In the above technical solution, a connection method of a compression spring or a tension spring is adopted so that the second drive assembly can drive the first drive assembly to move, thereby reducing the number of required external drive components.

[0017] Furthermore, the first mold includes a flaring section and a guide section, one end of the flaring section is connected to the first drive assembly, and the other end of the flaring section is connected to the guide section, and the guide section is conical and the cross-sectional radius gradually decreases in the direction away from the flaring.

[0018] In the above technical solution, the conical guide section is used to contact the pipe first, which can play a role in positioning and guiding the first mold.

[0019] Furthermore, the flared section is cylindrical, and the guide grooves are evenly spaced along the circumference of the flared section.

[0020] Furthermore, the second mold has a cylindrical main body, and the forming ribs are evenly spaced along the circumference of the main body.

[0021] In the above technical solution, a plurality of evenly distributed forming ribs and guide grooves are used to form a plurality of circumferentially evenly distributed protruding grooves at the expanded portion of the pipe, which is beneficial to improving the sealing performance of the expanded pipe connection.

[0022] Furthermore, the forming rib includes an extension portion and an arc portion, the extension portion is connected to the main body portion, the arc portion is connected to the extension portion, the extension portion matches the guide groove, and the arc portion extends out of the guide groove.

[0023] In the above technical solution, the extended portion of the forming rib is matched and placed in the guide groove, and the arc portion extends out of the guide groove to perform secondary expansion on the pipe, forming an outwardly protruding groove body consistent with the arc portion at the expanded portion of the pipe.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The pipe flaring device of this utility model first uses a first drive assembly to drive a first die to flare the pipe, expanding the end of the pipe and fitting it into the first die. A second drive assembly then drives a second die into the hollow structure of the first die, simultaneously allowing the forming ribs to enter the guide grooves. Because the forming ribs are exposed on the outer wall of the first die, they can extend and contact the pipe, thus performing a second flaring operation and forming a further outwardly protruding groove at the flared end. This device can produce flared pipes with grooves. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural front view of the pipe expanding device of the utility model;

[0027] Figure 2 This is an axonometric view of the pipe expanding device of the utility model;

[0028] Figure 3 It is a structural schematic diagram of the first mold and the front template of the utility model;

[0029] Figure 4 It is a structural schematic diagram of the second mold of the utility model;

[0030] Figure 5 It is a front view of the end face of the second mold of the present invention.

[0031] In the attached figure:

[0032] 1. First drive assembly; 11. Front template; 111. First through hole; 12. Rear template; 121. Second through hole; 13. Guide column; 2. Second drive assembly; 21. Push rod; 22. Push plate; 23. Movable plate; 3. First mold; 31. Hollow structure; 32. Guide groove; 33. Expanding section; 34. Guide section; 4. Second mold; 41. Forming rib; 411. Extension portion; 412. Arc portion; 413. Chamfer; 42. Main body; 5. Elastic connector. DETAILED DESCRIPTION

[0033] The drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate the embodiments, some components in the drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will understand that some well-known structures and their descriptions may be omitted from the drawings. The positional relationships depicted in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0034] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0036] Example 1

[0037] refer to Figures 1 to 5 The present embodiment discloses a pipe expanding device, comprising a first mold 3, a second mold 4, a first drive assembly 1 and a second drive assembly 2. The interior of the first mold 3 is a hollow structure 31. A guide groove 32 is axially opened on the inner wall surface of the first mold 3 and penetrates the outer wall surface of the first mold 3. The second mold 4 is accommodated in the hollow structure 31, and a forming rib 41 is provided on the outer peripheral surface of the second mold 4 to match the position of the guide groove 32. The forming rib 41 is slidably connected to the guide groove 32 and is exposed on the outer wall surface of the first mold 3; the first drive assembly 1 is connected to the first mold 3 to drive the first mold 3 to move axially; the second drive assembly 2 is connected to the second mold 4 to drive the second mold 4 to move axially.

[0038] During the operation of the pipe expanding device, the first drive assembly 1 first drives the first mold 3 to expand the pipe once, so that the end of the pipe is expanded and fits the first mold 3, and then the second drive assembly 2 drives the second mold 4 to enter the hollow structure 31 of the first mold 3, and at the same time, the forming rib 41 enters the guide groove 32. Since the forming rib 41 is exposed to the outer wall surface of the first mold 3, the forming rib 41 can extend and contact the pipe, thereby expanding the pipe a second time to further form an outwardly protruding groove at the expanded portion of the pipe. The first drive assembly 1 and the second drive assembly 2 can be respectively connected to external driving members to drive and move. The pipe is, for example, a PVC pipe, which has plasticity after heating. The pipe expanding device of this scheme facilitates the production of expanded pipes with grooves, with high production efficiency and good product quality.

[0039] In this embodiment, the second drive assembly 2 is axially slidably connected to the first drive assembly 1 and further includes an axially disposed elastic connector 5, with its ends connecting the first drive assembly 1 and the second drive assembly 2, respectively. Because the elastic connector 5 connects the first drive assembly 1 and the second drive assembly 2, when the second drive assembly 2 and the second die 4 move toward the tubular material, the elastic connector 5 drives the first drive assembly 1 and the first die 3 toward the tubular material. At this point, the elastic connector 5 undergoes initial deformation, and its elastic force drives the first drive assembly 1 to move. This positions the first die 3 closer to the tubular material, allowing it to initially contact the tubular material for primary flaring. After the primary flaring is complete, the first drive assembly 1 is fixed in position, and the second drive assembly 2 moves further toward the tubular material, further deforming the elastic connector 5 and enabling the second die 4 to perform a secondary flaring of the tubular material. This solution only requires the movement of the second drive assembly 2 to complete both primary and secondary flaring, reducing the number of required external drivers.

[0040] refer to Figures 1 to 3 In this embodiment, the first drive assembly 1 includes a front template 11, a rear template 12 and a guide column 13. The two ends of the guide column 13 are fixedly connected to the front template 11 and the rear template 12 respectively. The first mold 3 is connected to the front template 11. The front template 11 is provided with a first through hole 111 connected to the hollow structure 31. The second mold 4 passes through the first through hole 111, and the second drive assembly 2 is slidably connected to the guide column 13. Specifically, the front template 11 and the rear template 12 can be a roughly rectangular plate, and four guide columns 13 are respectively connected to the four corners of the rectangle to form a stable frame structure. The second drive assembly 2 can be set in the frame structure and slidably connected to the guide column 13. This embodiment adopts the connection method of the front template 11, the rear template 12 and the guide column 13, so that the second drive assembly 2 is slidably connected to the first drive assembly 1, and the first mold 3 is connected to the front template 11, which is convenient for assembly.

[0041] refer to Figure 1 and Figure 2 In this embodiment, the second driving assembly 2 includes a push rod 21 and a push plate 22. The push rod 21 is fixedly connected to the push plate 22. The push plate 22 is slidably connected to the guide column 13. The second mold 4 is connected to the side of the push plate 22 facing the first mold 3. The rear template 12 is provided with a second through hole 121, and the push rod 21 is slidably installed through the second through hole 121.

[0042] Specifically, the push plate 22 can be roughly rectangular, with its four corners slidingly connected to the four guide pillars 13, allowing the second drive assembly 2 to be slidably connected to the first drive assembly 1. The push rod 21 is connected to the middle of the push plate 22 and can be used to push the push plate 22 to move. The second mold 4 can be detachably connected to the push plate 22, for example, using bolts. Because the second mold 4 is mounted on the side of the push plate 22 facing the first mold 3, when the first drive assembly 1 slides within the second drive assembly 2, the second mold 4 can be placed within the hollow structure 31 of the first mold 3.

[0043] In some embodiments, the push rod 21 can be connected to an external linear drive, which pushes the push plate 22 via the push rod 21, thereby pushing the movable plate 23 to move the second mold 4. The rear mold plate 12 can also be connected to an external linear drive to drive the first drive assembly 1 to move, thereby moving the first mold 3. The external linear drive can be a pneumatic cylinder, a hydraulic cylinder, or an electric push rod 21. Optionally, the push plate can be divided into two abutting plates, one of which is connected to the push rod and the other to the first mold, to facilitate assembly and disassembly.

[0044] refer to Figure 1 and Figure 2 In this embodiment, the elastic connecting member 5 is a compression spring, one end of the elastic connecting member 5 is in contact with or fixedly connected to the push plate 22 , and the other end of the elastic connecting member 5 is in contact with or fixedly connected to the front template 11 .

[0045] In other embodiments, the elastic connector 5 may be a tension spring, one end of the elastic connector 5 is fixedly connected to the push plate 22 , and the other end of the elastic connector 5 is fixedly connected to the rear template 12 .

[0046] By using a compression spring or tension spring connection method, the second drive assembly 2 can drive the first drive assembly 1 to move, so that the second drive assembly 2 only needs to be connected to an external linear drive component, thereby reducing the number of required external linear drives.

[0047] Example 2

[0048] refer to Figures 1 to 5This embodiment is similar to embodiment 1, except that in this embodiment, the first mold 3 includes a flaring section 33 and a guide section 34, one end of the flaring section is connected to the first drive assembly 1, and the other end of the flaring section 33 is connected to the guide section 34, and the guide section 34 is conical and the cross-sectional radius gradually decreases in the direction away from the flaring.

[0049] Specifically, a hollow structure 31 is defined along the central axis of the flared section 33. The hollow structure 31 is generally cylindrical. A guide groove 32 is defined in the flared section 33 and around the hollow structure 31. The guide groove 32 extends axially along the flared section 34 and radially connects the hollow structure 31 with the outer surface of the flared section 33. The first mold 3 is positioned within the hollow structure 31 through the first through-hole 111, with the forming rib 41 positioned within the guide groove 32, the top of the forming rib 41 extending beyond the guide groove 32. The conical guide section 35, which initially contacts the tubing, serves to position and guide the first mold 3.

[0050] Example 3

[0051] refer to Figures 1 to 5 This embodiment is similar to Example 1, except that the flared section is cylindrical, and the guide grooves 32 are evenly spaced along the circumference of the flared section. The second mold 4 has a cylindrical main body 42, and the forming ribs 41 are evenly spaced along the circumference of the main body 42. The use of multiple evenly distributed forming ribs 41 and guide grooves 32 forms multiple protruding grooves evenly distributed around the circumference of the pipe flare, which helps improve the sealing performance of the pipe flare connection.

[0052] In this embodiment, the forming rib 41 preferably includes an extension portion 411 and an arc portion 412. The extension portion 411 is connected to the main portion 42, and the arc portion 412 is connected to the extension portion 411. The extension portion 411 matches the guide groove 32, and the arc portion 412 extends outside the guide groove 32. The extension portion 411 of the forming rib 41 is matched and placed in the guide groove 32, that is, the width of the extension portion 411 is consistent with the width of the guide groove, which serves as a guide and limiter. The arc portion 412 extends outside the guide groove 32 to facilitate secondary expansion of the pipe, forming an outwardly protruding groove body consistent with the arc portion 412 at the expanded pipe.

[0053] refer to Figure 4 In this embodiment, a chamfer 413 is provided at one end of the forming rib 41 near the first die 3. The chamfer 413 can be a rounded chamfer or an oblique chamfer, extending from the top of the extension portion 411 of the forming rib 41 to the top of the arc portion 412. The forming rib 41 first contacts the flared pipe through the chamfer 413, and then the arc portion 412 contacts the pipe as the second die 4 moves. This makes it easier to form the pipe groove and improves quality.

[0054] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A pipe expanding device, characterized in that: The invention comprises a first mold (3), a second mold (4), a first drive assembly (1) and a second drive assembly (2), wherein the interior of the first mold (3) is a hollow structure (31), the inner wall surface of the first mold (3) is provided with a guide groove (32) penetrating the outer wall surface of the first mold (3) along the axial direction, the second mold (4) is accommodated in the hollow structure (31), and the outer peripheral surface of the second mold (4) is provided with a forming rib (41) adapted to the position of the guide groove (32), the forming rib (41) is slidably connected to the guide groove (32), and the forming rib (41) is exposed on the outer wall surface of the first mold (3); the first drive assembly (1) is connected to the first mold (3) to drive the first mold (3) to move axially; the second drive assembly (2) is connected to the second mold (4) to drive the second mold (4) to move axially.

2. The pipe expanding device according to claim 1, characterized in that: The second drive assembly (2) is axially slidably connected to the first drive assembly (1), and further comprises an elastic connecting member (5) arranged axially, wherein the two ends of the elastic connecting member (5) are respectively connected to the first drive assembly (1) and the second drive assembly (2).

3. The pipe expanding device according to claim 2, characterized in that: The first driving assembly (1) comprises a front template (11), a rear template (12) and a guide column (13); the two ends of the guide column (13) are respectively fixedly connected to the front template (11) and the rear template (12); the first mold (3) is connected to the front template (11); the front template (11) is provided with a first through hole (111) connected to the hollow structure (31); the second mold (4) passes through the first through hole (111); and the second driving assembly (2) is slidably connected to the guide column (13).

4. The pipe expanding device according to claim 3, characterized in that: The second driving assembly (2) includes a push rod (21) and a push plate (22), the push rod (21) is fixedly connected to the push plate (22), the push plate (22) is slidably connected to the guide column (13), the second mold (4) is connected to the side of the push plate (22) facing the first mold (3), the rear mold plate (12) is provided with a second through hole (121), and the push rod (21) is slidably installed through the second through hole (121).

5. The pipe expanding device according to claim 4, characterized in that: The elastic connecting member (5) is a compression spring, one end of the elastic connecting member (5) is in contact with or fixedly connected to the push plate (22), and the other end of the elastic connecting member (5) is in contact with or fixedly connected to the front template (11).

6. The pipe expanding device according to claim 4, characterized in that: The elastic connecting member (5) is a tension spring, one end of the elastic connecting member (5) is fixedly connected to the push plate (22), and the other end of the elastic connecting member (5) is fixedly connected to the rear template (12).

7. The pipe expanding device according to claim 1, characterized in that: The first mold (3) comprises a flaring section (33) and a guide section (34), one end of the flaring section (33) is connected to the first drive assembly (1), and the other end of the flaring section (33) is connected to the guide section (34), and the guide section (34) is conical and has a cross-sectional radius that gradually decreases in a direction away from the flaring section (33).

8. The pipe expanding device according to claim 7, characterized in that: The flared section (33) is cylindrical, and the guide grooves (32) are evenly spaced along the circumference of the flared section (33).

9. The pipe expanding device according to claim 8, characterized in that: The second mold (4) has a cylindrical main body (42), and the forming ribs (41) are evenly spaced along the circumference of the main body (42).

10. The pipe expanding device according to claim 9, characterized in that: The forming rib (41) comprises an extension portion (411) and an arc portion (412), wherein the extension portion (411) is connected to the main body portion (42), and the arc portion (412) is connected to the extension portion (411), the extension portion (411) matches the guide groove (32), and the arc portion (412) extends out of the guide groove (32).

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