Pipe fitting rounding device

Abstract

The utility model discloses a pipe fitting rounding device. The pipe fitting rounding device comprises a base; the lower die is fixed to the base and provided with a first die cavity, and the section of the first die cavity in the first direction is semicircular. The upper die is movably installed on the base and provided with a second die cavity, the section of the second die cavity in the first direction is semicircular, and the upper die can move to the first position abutting against the lower die and the second position separated from the lower die relative to the base in the first direction. The first die cavity and the second die cavity are connected to form a shaping cavity with a circular section in a first direction; the elastic piece applies elastic acting force to the upper die to enable the upper die to move towards the second position; in the rounding process of the pipe fitting, a series of operations such as pipe loading, mold closing rounding and pipe fitting demolding can be rapidly completed, it is guaranteed that the product quality of the rounding process is stable, the reject ratio is reduced, and the production efficiency is effectively improved.

Description

Technical Field

[0001] This utility model relates to pipe fitting processing equipment, and in particular to a pipe fitting rounding device. Background Technology

[0002] Some pipe fittings, such as water outlet pipes, require high precision in the circularity of the pipe ends during production. During molding, packaging, and transportation, the pipe ends are prone to deformation, which affects subsequent assembly processes and product quality. Therefore, it is necessary to round the pipe ends or sections near the ends. However, existing methods for rounding pipe fittings involve simply pressing upper and lower plates made of POM material together to achieve a rounded effect. The positioning and pressing distance during this process rely entirely on the worker's intuition, resulting in poor rounding accuracy, high defect rates, and low work efficiency. Utility Model Content

[0003] The present invention aims to at least partially solve one of the aforementioned technical problems in the related art. To this end, the present invention proposes a pipe fitting rounding device.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] The pipe rounding device according to a first aspect embodiment of the present invention includes:

[0006] Base;

[0007] The lower mold is fixed on the base and has a first mold cavity, the first mold cavity having a semi-circular cross-section in a first direction;

[0008] An upper mold, movably mounted on the base, has a second mold cavity with a semi-circular cross-section in the first direction. The upper mold is movable relative to the base along the first direction to a first position abutting against the lower mold and a second position separating from the lower mold. When the upper mold moves to the first position, the first mold cavity and the second mold cavity connect to form a shaping cavity with a circular cross-section in the first direction.

[0009] An elastic element applies an elastic force to the upper mold, causing it to move toward the second position.

[0010] The pipe fitting rounding device according to the embodiment of the present utility model has at least the following beneficial effects: in the pipe fitting rounding process, a series of operations such as pipe loading, mold closing and rounding, and pipe fitting demolding can be completed quickly, ensuring stable product quality in the rounding process, reducing the defect rate, and effectively improving production efficiency.

[0011] According to some embodiments of the present invention, a counterweight is provided between the base and the upper mold, the upper mold is fixed on the counterweight, and the counterweight and the base are connected by a guide structure so that the counterweight and the upper mold can reciprocate in the first direction, and the elastic element is connected between the counterweight and the base.

[0012] According to some embodiments of the present invention, the guide structure includes guide rods and guide sleeves. Multiple guide rods are fixed parallel to each other on the base. The axial direction of the guide rods is consistent with the first direction. Multiple guide sleeves are inserted and fixed on the counterweight base. The guide sleeves are paired and sleeved on the guide rods one by one.

[0013] According to some embodiments of the present invention, the counterweight seat is provided with a mounting groove on the side facing the lower mold. The mounting groove includes a first groove portion and a second groove portion arranged in a stepped manner in the first direction. The first groove portion is closer to the lower mold than the second groove portion. The groove width of the first groove portion is greater than the groove width of the second groove portion. The shape of the upper mold is adapted to the mounting groove and fixed in the mounting groove.

[0014] According to some embodiments of this utility model, the base is coaxially provided with a first countersunk hole and a first mounting hole along the first direction, the counterweight is coaxially provided with a second countersunk hole and a second mounting hole along the first direction, the elastic element is a spring, one end of the elastic element extends into and abuts in the first countersunk hole, and the other end of the elastic element extends into and abuts in the second countersunk hole; it also includes a first adjusting screw, the first adjusting screw passes through the second countersunk hole, the second mounting hole, the first countersunk hole and the first mounting hole, the first adjusting screw is threadedly connected to the first mounting hole, and the countersunk head of the first adjusting screw can abut against the end of the second mounting hole.

[0015] According to some embodiments of the present invention, the lower mold is provided with an extension groove, which is arc-shaped and extends along one end of the first mold cavity.

[0016] According to some embodiments of the present invention, the lower mold is provided with two extension grooves, which extend from the same end of the first mold cavity and are symmetrically arranged with the central axis of the first mold cavity as the axis of symmetry.

[0017] According to some embodiments of the present invention, a limiting component is also included, the limiting component including a positioning rod, the positioning rod being inserted into the first mold cavity.

[0018] According to some embodiments of the present invention, the outer diameter of the positioning rod is smaller than the inner diameter of the shaping cavity, and the side wall of the positioning rod abuts against the cavity wall of the first mold cavity.

[0019] According to some embodiments of the present invention, the limiting component includes a second adjusting screw, a third adjusting screw, and a connecting seat. The connecting seat has a through groove, and the second adjusting screw and the third adjusting screw pass through the through groove in parallel. The second adjusting screw is locked onto the lower mold or the base, and the positioning rod is connected to the third adjusting screw.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 yes Figure 1 A structural decomposition diagram;

[0024] Figure 3 This is a schematic diagram of the lower mold structure;

[0025] Figure 4 This is a schematic diagram of the upper mold structure;

[0026] Figure 5 yes Figure 1 The main view;

[0027] Figure 6 yes Figure 5 A magnified view of a portion of the image with the upper mold positioned in the second position;

[0028] Figure 7 yes Figure 5 A magnified view of a portion of the image with the upper mold in the first position;

[0029] Figure 8 yes Figure 1 Partial structural assembly diagram;

[0030] Figure 9 yes Figure 1 A cross-sectional view from the left side;

[0031] Figure 10 yes Figure 1 A diagram illustrating the usage status of the document;

[0032] Figure 11 This is a schematic diagram of one embodiment of the pipe fitting.

[0033] Reference numerals: Pipe fitting 001; Base 100; First countersunk hole 110; First mounting hole 120; Lower mold 200; First mold cavity 210; Extension groove 220; Upper mold 300; Second mold cavity 310; Shaping cavity 400; Elastic element 500; Counterweight seat 600; Mounting groove 610; First groove 611; Second groove 612; Second countersunk hole 620; Second mounting hole 630; Guide rod 710; Guide sleeve 720; First adjusting screw 810; Limiting assembly 900; Positioning rod 910; Second adjusting screw 920; Third adjusting screw 930; Connecting seat 940; Through groove 941. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0035] This utility model relates to a pipe fitting rounding device, including a base 100, a lower mold 200, an upper mold 300, and an elastic element 500.

[0036] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the base 100 serves as a support for the lower mold 200 and the upper mold 300, with the lower mold 200 fixedly mounted on the base 100. The lower mold 200 can be locked onto the base 100 with screws. The lower mold 200 has a first mold cavity 210, the cross-section of which is semi-circular in a first direction. That is, the first mold cavity 210 is a hollow semi-cylindrical shape, and in the orientation shown in the figure, the axial direction of the first mold cavity 210 is horizontal front-to-back, and the first direction is vertical up-and-down. The first mold cavity 210 is opened on the upper side of the lower mold 200, with an upward opening and openings at both the front and rear ends. The upper mold 300 is movably mounted on the base 100. A second mold cavity 310 is opened on the lower side of the upper mold 300, the cross-section of which is semi-circular in the first direction. The upper mold 300 is located above the lower mold 200. The second mold cavity 310 is a hollow semi-cylindrical shape, with its axial direction being horizontal and facing forward and backward. The second mold cavity 310 opens downward and has openings at both its front and rear ends. The first mold cavity 210 and the second mold cavity 310 have the same radius. When the base 100 moves, the upper mold 300 has a first position and a second position relative to the lower mold 200. Figure 7As shown, in the first position, the upper mold 300 descends to abut against the lower mold 200 to achieve mold closing. At this time, the first mold cavity 210 and the second mold cavity 310 are radially connected, and the first mold cavity 210 and the second mold cavity 310 cooperate to form a shaping cavity 400. The cross-section of the shaping cavity 400 in the first direction is circular, that is, the shaping cavity 400 is a cavity with a circular radial cross-section. Figure 6 As shown, the second position is when the upper mold 300 moves upward from its position of abutting the lower mold 200, and the position where the upper mold 300 leaves the lower mold 200 is the second position. In the second position, the first mold cavity 210 and the second mold cavity 310 also separate, forming a certain gap between the upper mold 300 and the lower mold 200. The elastic element 500 can be installed between the upper mold 300 and the lower mold 200, or between the base 100 and the upper mold 300. The elastic element 500 can be a spring or other elastic component. The elastic element 500 applies an elastic force to the upper mold 300, which drives the upper mold 300 to move to the second position.

[0037] In practical use, the pipe rounding device can be used in conjunction with a punch press. Under normal conditions, the upper die 300 is held in the second position by the elastic force of the elastic element 500. For example... Figure 10 and Figure 11 As shown, one end of the tube 001 (hereinafter referred to as tube 001), which needs to be rounded, is inserted into the first die cavity 210. The punch is started, and the punch head descends, pressing the upper die 300 down to the first position. The first die cavity 210 and the second die cavity 310 connect to form a shaping cavity 400. The cavity wall of the shaping cavity 400 is pressed tightly against the outer wall of the end of the tube 001. Through the cooperation of the first die cavity 210 and the second die cavity 310, the end of the tube 001 is pressed radially to shape the outer contour of the end of the tube 001 into a regular circle, that is, the end of the tube 001 is rounded. After the rounding is completed, the punch head rises, and the upper die 300 returns to the second position under the elastic force of the elastic element 500. The end of the tube 001 is no longer in the first die cavity 210 and the second die cavity 310, and the worker can easily pull the tube 001 out of the first die cavity 210. Based on the outer diameter of the end of pipe fitting 001 that needs to be rounded, select the upper mold 300 and lower mold 200 with corresponding inner diameters. Using the pipe fitting rounding device, a series of operations such as pipe loading, mold closing and rounding, and pipe fitting 001 demolding can be completed quickly in the rounding process of pipe fitting 001, ensuring stable product quality, reducing defect rate, and effectively improving production efficiency.

[0038] In some embodiments of this utility model, such as Figure 1 and Figure 2As shown, a counterweight 600 is provided between the base 100 and the upper die 300. The upper die 300 can be fixed to the counterweight 600 by screws. The counterweight 600 and the base 100 are connected by a guide structure. The guide structure can be a guide rail, a sliding column, or similar structure. The guide structure guides the counterweight 600 in a defined direction, allowing the counterweight 600 and the upper die 300 to move back and forth in the first direction. An elastic element 500 is connected between the counterweight 600 and the base 100. The punch of the press acts on the counterweight 600, preventing the upper die 300 from directly contacting the punch, thus providing a certain degree of protection for the upper die 300. A strong elastic element 500 can be selected. The counterweight 600 increases the downward pressure on the elastic element 500, thereby reducing the distance between the upper die 300 and the lower die 200 in the second position and reducing the travel distance of the upper die 300 under the action of the press force. In the second position, the distance between the upper mold 300 and the lower mold 200 is preferably in the range of 1 mm to 3 mm.

[0039] Based on the above embodiments, the guide structure includes guide rods 710 and guide sleeves 720. Multiple guide rods 710 are fixed parallel to each other on the base 100. In this embodiment, four guide rods 710 are arranged in a four-corner configuration on the base 100. The axial direction of each guide rod 710 is consistent with the first direction, i.e., the guide rods 710 are placed vertically. Multiple guide sleeves 720 are inserted and fixed on the counterweight 600. The guide sleeves 720 can be interference-fitted with the counterweight 600. All guide sleeves 720 are installed vertically, and the number of guide sleeves 720 is paired one-to-one with the number of guide rods 710. During installation, one guide sleeve 720 is paired and fitted onto one guide rod 710. Lubricating oil can be applied between the guide sleeves 720 and the guide rods 710 to reduce friction. The guide rod 710 and guide sleeve 720 work together to guide the up-and-down movement of the counterweight 600 relative to the base 100, while also limiting the wobbling of the counterweight 600 during movement, ensuring the stability of the upper mold 300 and lower mold 200 when they are closed. After prolonged use, the guide rod 710 or guide sleeve 720 can be replaced if they show wear.

[0040] Based on the above embodiments, such as Figure 1 and Figure 2As shown, the counterweight 600 has a mounting groove 610 on its side facing the lower mold 200. That is, the mounting groove 610 is located on the lower side of the lower mold 200. The mounting groove 610 includes a first groove portion 611 and a second groove portion 612 arranged in a stepped manner in a first direction. The first groove portion 611 is closer to the lower mold 200 than the second groove portion 612, and the width of the first groove portion 611 is greater than the width of the second groove portion 612. In the illustrated direction, the groove widths are the dimensions of the first groove portion 611 and the second groove portion 612 in the left-right direction. The cross-section of the mounting groove 610 in the first direction is convex. The shape of the upper mold 300 is adapted to the mounting groove 610, and the cross-section of the upper mold 300 in the first direction is correspondingly convex. The upper mold 300 can be fixed in the mounting groove 610 by screws, and the left and right sides of the first groove portion 611 and the second groove portion 612 define the left and right mounting positions of the upper mold 300. For pipe fittings 001 with different outer diameters, different upper molds 300 and lower molds 200 can be used.

[0041] Furthermore, such as Figure 2 and Figure 9As shown, the base 100 is coaxially provided with a first countersunk hole 110 and a first mounting hole 120 along a first direction, the inner diameter of the first countersunk hole 110 being larger than the inner diameter of the first mounting hole 120. The counterweight 600 is coaxially provided with a second countersunk hole 620 and a second mounting hole 630 along the first direction, the inner diameter of the second countersunk hole 620 being larger than the inner diameter of the second mounting hole 630. In the direction shown in the figure, the first countersunk hole 110 is located above the first mounting hole 120, and the second mounting hole 630 is located above the second countersunk hole 620. Two sets of first countersunk holes 110 and first mounting holes 120 can be provided on the base 100, and correspondingly, two sets of second countersunk holes 620 and second mounting holes 630 are provided on the counterweight 600. The first countersunk hole 110 and the second countersunk hole 620 are opposite to each other. The elastic element 500 is a spring. The lower part of the elastic element 500 extends into and abuts against the first countersunk hole 110, and the first countersunk hole 110 supports the bottom of the elastic element 500. The upper part of the elastic element 500 extends upward and abuts against the second countersunk hole 620. The elastic element 500 supports the second countersunk hole 620 upward. At this time, the first countersunk hole 110, the first mounting hole 120, the second countersunk hole 620, and the second mounting hole 630 are in a coaxial position. Then, the first adjusting screw 810 is used to pass through the second mounting hole 630, the second countersunk hole 620, the first countersunk hole 110, and the first mounting hole 120 sequentially from top to bottom. The inner wall of the first mounting hole 120 is provided with internal threads, and the first mounting hole 120 and the first adjusting screw 810 are threaded together. The first adjusting screw 810 is gradually screwed downward into the first mounting hole 120, and the countersunk head of the first adjusting screw 810 abuts against the upper end of the second mounting hole 630. Then, the counterweight 600 is pressed down onto the base 100. A countersunk hole can be provided at the upper end of the second mounting hole 630, and the countersunk head of the first adjusting screw 810 can be hidden in the countersunk hole. The elastic element 500 is supported between the first countersunk hole 110 and the second countersunk hole 620, so that a certain gap is formed between the base 100 and the counterweight 600, that is, the upper mold 300 is held in the second position. By adjusting the screw depth of the first adjusting screw 810, in conjunction with the elastic force of the elastic element 500, the distance between the upper mold 300 and the lower mold 200 in the second position can be adjusted.

[0042] The pipe fitting 001 that needs to be perfectly round can be a straight pipe, a bent pipe, or other shapes. In some specific embodiments of this utility model, such as... Figure 1 , Figure 3 , Figure 10 and Figure 11As shown, the lower mold 200 is provided with an extension groove 220. The extension groove 220 extends in an arc shape along one end of the first mold cavity 210. Both the extension groove 220 and the first mold cavity 210 are located on the upper side of the lower mold 200. When the pipe 001 is a bent pipe, after one end of the pipe 001 is inserted into the first mold cavity 210, the bent part of the pipe 001 is located outside the first mold cavity 210, and the extension groove 220 provides clearance and support for the bent part of the pipe 001. Furthermore, the lower mold 200 is provided with two extension grooves 220. The two extension grooves 220 extend from the same end of the first mold cavity 210. The two extension grooves 220 are symmetrically arranged about the central axis of the first mold cavity 210. The bent pipe can swing axially relative to the first mold cavity 210. No matter whether the bent pipe swings to the left or right, the two extension grooves 220 can correspondingly provide clearance for the bent pipe.

[0043] In some embodiments of this utility model, such as Figure 2 and Figure 8 As shown, it also includes a limiting component 900. The limiting component 900 includes a positioning rod 910, which is inserted into the first mold cavity 210. When the pipe 001 extends into the first mold cavity 210, the pipe 001 can abut against the end of the positioning rod 910. The positioning rod 910 limits the insertion depth of the pipe 001 relative to the first mold cavity 210, ensuring the consistency of the length of the pipe segments of each pipe 001 after rounding. The outer diameter of the positioning rod 910 is smaller than the inner diameter of the forming cavity 400 to prevent the cavity walls of the upper mold 300 and lower mold 200 from impacting the positioning rod 910 and causing wear when the molds are closed. The side wall of the positioning rod 910 abuts against the cavity wall of the first mold cavity 210, ensuring that the pipe 001 can abut against the end of the positioning rod 910 after extending into the first mold cavity 210 to achieve limiting.

[0044] Based on the above embodiments, the limiting assembly 900 includes a second adjusting screw 920, a third adjusting screw 930, and a connecting seat 940. A through slot 941 is provided on the connecting seat 940. The second adjusting screw 920 and the third adjusting screw 930 are parallel to each other and pass through the through slot 941. The second adjusting screw 920 is locked onto the lower mold 200 or the base 100. The connecting seat 940 can swing around the second adjusting screw 920. The positioning rod 910 is threadedly connected to the third adjusting screw 930. Different positioning rods 910 can be used depending on the size of different pipe fittings 001. The relative positions of the third adjusting screw 930 and the second adjusting screw 920 on the through slot 941 can be adjusted, cooperating with the swinging connecting seat 940 to drive the positioning rod 910 to move, thereby causing the side wall of the positioning rod 910 to abut against the cavity wall of the first mold cavity 210.

[0045] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this specification, references to terms such as "some specific embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A pipe rounding device, characterized by, The utility model relates to a moulding device, comprising: a base (100); a lower mould (200) fixed on the base (100), the lower mould (200) is equipped with a first mould cavity (210), the cross section of the first mould cavity (210) in the first direction is semicircular; an upper mould (300) movably installed on the base (100), the upper mould (300) is equipped with a second mould cavity (310), the cross section of the second mould cavity (310) in the first direction is semicircular, the upper mould (300) can be moved to the first position of abutting with the lower mould (200) and the second position of separating from the lower mould (200) along the first direction relative to the base (100), when the upper mould (300) moves to the first position, the first mould cavity (210) and the second mould cavity (310) are connected to form the shaping cavity (400) of circular cross section in the first direction; and a resilient member (500) exerting elastic force on the upper mould (300) to move to the second position.

2. The tube rounding device of claim 1, wherein: The base (100) and the upper mould (300) are equipped with a counterweight base (600), the upper mould (300) is fixed on the counterweight base (600), the counterweight base (600) and the base (100) are connected through a guide structure, so that the counterweight base (600) can reciprocate along with the upper mould (300) in the first direction, and the resilient member (500) is connected between the counterweight base (600) and the base (100).

3. The tube rounding device of claim 2, wherein: The guide structure comprises guide rods (710) and guide sleeves (720), a plurality of guide rods (710) are fixed on the base (100) in parallel, the axial direction of the guide rod (710) is consistent with the first direction, a plurality of guide sleeves (720) are fixed on the counterweight base (600), and the guide sleeve (720) is matched and sleeved on the guide rod (710).

4. The tube rounding device of claim 2, wherein: The side surface of the counterweight base (600) is equipped with a mounting groove (610) towards the lower mould (200), the mounting groove (610) comprises a first groove part (611) and a second groove part (612) arranged in a stepped manner in the first direction, the first groove part (611) is closer to the lower mould (200) than the second groove part (612), the groove width of the first groove part (611) is greater than the groove width of the second groove part (612), and the shape of the upper mould (300) is matched with the mounting groove (610) and fixed in the mounting groove (610).

5. The tube rounding device of claim 2, wherein: The base (100) is coaxially provided with a first counterbore (110) and a first mounting hole (120) along the first direction, the counterweight base (600) is coaxially provided with a second counterbore (620) and a second mounting hole (630) along the first direction, the elastic member (500) is a spring, one end of the elastic member (500) extends into and abuts against the first counterbore (110), the other end of the elastic member (500) extends into and abuts against the second counterbore (620); further comprising a first adjusting screw (810), the first adjusting screw (810) is provided in the second counterbore (620), the second mounting hole (630), the first counterbore (110) and the first mounting hole (120), the first adjusting screw (810) is in threaded connection with the first mounting hole (120), the countersunk head of the first adjusting screw (810) can abut on the end of the second mounting hole (630).

6. The tube rounding device of claim 1, wherein: The lower mold (200) is provided with an extension groove (220), the extension groove (220) extends along one end of the first mold cavity (210) in an arc shape.

7. The tube rounding device of claim 6, wherein: The lower mold (200) is provided with two extension grooves (220), the two extension grooves (220) extend out from the same end of the first mold cavity (210), and the two extension grooves (220) are symmetrically arranged with the central axis of the first mold cavity (210) as the axis of symmetry.

8. The tube rounding device of claim 1, wherein: Further comprising a limiting assembly (900), the limiting assembly (900) comprises a positioning rod (910), the positioning rod (910) is inserted into the first mold cavity (210).

9. The tube rounding device of claim 8, wherein: The outer diameter of the positioning rod (910) is smaller than the inner diameter of the shaping cavity (400), and the side wall of the positioning rod (910) abuts against the cavity wall of the first mold cavity (210).

10. A tube rounding device according to claim 8 or 9, characterized in that: The limiting assembly (900) comprises a second adjusting screw (920), a third adjusting screw (930) and a connecting seat (940), the connecting seat (940) is provided with a through groove (941), the second adjusting screw (920) and the third adjusting screw (930) are provided in the through groove (941) in parallel with each other, the second adjusting screw (920) is locked on the lower mold (200) or the base (100), and the positioning rod (910) is connected with the third adjusting screw (930).

Images