Pipe end horn mouth forming device

Abstract

The utility model provides a pipe end horn mouth forming device which is used for forming a pipe end double-layer horn mouth structure of a pipe fitting and comprises an inner edge folding mechanism and a flaring mechanism. The inner edge folding mechanism comprises a first clamping assembly, a second clamping assembly, a rotating assembly, a cutting assembly and an extruding assembly, the cutting assembly can be used for cutting the pipe wall of the pipe fitting, and the extruding assembly can inwards extrude the pipe wall of the pipe fitting to form an inner edge folding structure; the flaring mechanism comprises a third clamping assembly and a punch assembly, the punch assembly is provided with a conical punch coaxial with the pipe fitting, the conical punch is used for moving towards the pipe opening of the pipe fitting in the axial direction of the pipe fitting, at the moment, the pipe opening inner edge folding structure starts to be folded inwards under the action of inward extrusion force, meanwhile, the conical surface of the conical punch extrudes outwards, and the pipe opening inner edge folding structure is formed. A pipe end double-layer horn mouth structure can be formed; the double-side horn mouth structure is high in strength and good in pressure resistance, and the problem of leakage of the connecting pipe can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of machining, in particular to a forming device for a pipe end flared mouth. Background Art

[0002] In the development of modern industry, the use of connecting pipes is involved in many fields, such as the automotive field, the aerospace field, the communication field, the refrigeration and air-conditioning field, etc. In the specific use of connecting pipes, in order to disperse the stress between the pipe end of the connecting pipe and the joint, improve the sealing performance of the pipeline connection, and make the pipeline easier to assemble and connect, etc., generally a punch is used to expand the pipe end of the connecting pipe outwards to form a flared mouth shape at the pipe end.

[0003] Among them, taking the refrigeration and air-conditioning field as an example, in a refrigeration system, the pipe end of the connecting pipe between the condenser and the evaporator is set in a flared mouth shape. However, in the prior art, the flared mouth of the pipe end of the connecting pipe currently used in the industry is generally a single-layer flared mouth directly expanded outwards by a punch, and there are mainly the following problems: (1) The strength of the single-layer flared mouth is poor, the pressure resistance is insufficient, and problems such as cracking or deformation are likely to occur during installation or use, resulting in leakage of the connecting pipe; (2) When the single-layer flared mouth is formed, the situation of the pipe orifice curling is likely to occur, which is not conducive to the quality consistency control; (3) There are more and larger burrs at the pipe orifice position of the single-layer flared mouth, and when directly expanding outwards to form, it is easy to cause quality abnormalities such as indentation on the flared mouth, and further leakage problems are likely to occur. Content of the Utility Model

[0004] The utility model provides a forming device for a pipe end flared mouth, which can form a double-layer flared mouth, thereby improving the strength and pressure resistance of the flared mouth, enhancing the connection sealing performance, and improving the forming quality of the flared mouth. The specific technical solutions are as follows:

[0005] A forming device for a pipe end flared mouth, which is used for forming a double-layer flared mouth structure at the pipe end of a pipe fitting, and comprises an inner flanging mechanism and a flaring mechanism;

[0006] The inner flanging mechanism comprises an extrusion assembly, and the extrusion assembly is provided with an inclined extrusion surface, which can extrude the pipe wall of the pipe fitting inwards to form an inner flanging structure at the pipe orifice;

[0007] The flaring mechanism comprises a punch assembly, the punch assembly is provided with a conical punch coaxial with the pipe fitting, the head diameter of the conical punch is larger than the diameter of the pipe orifice after the inner flanging of the pipe fitting and smaller than the diameter of the pipe fitting; the conical punch is located at the pipe orifice of the pipe fitting and can move along the axial direction of the pipe fitting.

[0008] Further, the inner hemming mechanism further includes a first clamping assembly, a second clamping assembly, a rotating assembly, and a cutting assembly. The cutting assembly and the extrusion assembly are located between the first clamping assembly and the second clamping assembly. The first clamping assembly and the second clamping assembly can clamp the pipe fitting. The cutting assembly can cut the pipe wall of the pipe fitting. The rotating assembly can control the pipe fitting to rotate around its axis or control the cutting assembly and the extrusion assembly to rotate around the axis of the pipe fitting. The flaring mechanism further includes a third clamping assembly that can clamp the pipe fitting.

[0009] Further, the extrusion assembly is provided with two connected and symmetrical extrusion surfaces. The two extrusion surfaces as a whole form a V-shaped structure protruding towards the pipe fitting, and the symmetry plane of the two extrusion surfaces coincides with the cutting plane of the cutting assembly.

[0010] Further, the inner hemming mechanism further includes a breaking component. The breaking component can control the first clamping assembly and / or the second clamping assembly to move axially along the pipe fitting and break the pipe fitting at the cutting position.

[0011] Further, the inner hemming mechanism is further provided with a supporting component. The supporting component and the extrusion component are respectively located on both sides of the pipe fitting, and the supporting component is provided with a supporting surface tangent to the pipe wall of the pipe fitting.

[0012] Further, the inner hemming mechanism is further provided with a cutter disc perpendicular to the axis of the pipe fitting. A through hole allowing the pipe fitting to pass through is provided at the center of the cutter disc. The cutting assembly, the extrusion assembly, and the supporting component are installed on the cutter disc, and the rotating assembly can control the cutter disc to rotate around the pipe fitting.

[0013] Further, the cutting assembly, the extrusion assembly, and the supporting component are installed on the cutter disc through sliders, and the sliders can move radially towards the through hole on the cutter disc.

[0014] Further, gaskets are provided at the bottoms of the cutting assembly and / or the extrusion assembly and / or the supporting component. The gaskets can adjust the distances between the cutting assembly and / or the extrusion assembly and / or the supporting component and the cutter disc.

[0015] Further, the cutting assembly includes a disc-shaped cutting blade, and the cutting blade can cut the pipe wall of the pipe fitting.

[0016] Further, the extrusion assembly includes an extrusion bearing, and the side surface of the extrusion bearing is a conical surface structure.

[0017] Further, the supporting component includes a supporting bearing, and the side surface of the supporting bearing is a planar structure tangent to the pipe wall of the pipe fitting.

[0018] Further, the first clamping assembly and / or the second clamping assembly and / or the third clamping assembly are composed of an upper clamping die and a lower clamping die. Arc-shaped grooves adapted to the pipe wall of the pipe fitting are provided in the upper clamping die and the lower clamping die, and the upper clamping die and the lower clamping die can approach or move away from each other.

[0019] The pipe end flaring device provided by the present utility model first forms an inwardly folded edge structure at the pipe orifice and then punches to form a double-layer flared mouth structure. Compared with the single-layer flared mouth in the prior art, it has the following advantages: (1) greater strength, better pressure resistance, and is not prone to problems such as cracking or deformation during installation or use, thereby reducing the occurrence of leakage in the connecting pipe; (2) it is not easy to generate pipe orifice curling when punching to form the double-layer flared mouth structure, which is beneficial to the quality consistency control; (3) after the double-layer flared mouth structure is formed, the cut part of the pipe orifice is folded into the pipe fitting. At this time, the inner wall of the flared mouth is the original smooth outer wall of the pipe fitting, thereby reducing the probability of quality abnormalities such as indentation on the flared mouth and further reducing the occurrence of leakage in the connecting pipe. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the inwardly folded edge structure of the pipe fitting.

[0021] Figure 2 It is a schematic diagram of the double-layer flared mouth structure of the pipe fitting.

[0022] Figure 3 It is a schematic diagram of the overall inwardly folding edge mechanism.

[0023] Figure 4 It is a schematic diagram of the key components (excluding the clamping assembly) of the inwardly folding edge mechanism Figure 1 .

[0024] Figure 5 It is a schematic diagram of the key components (excluding the clamping assembly) of the inwardly folding edge mechanism Figure 2 .

[0025] Figure 6 It is an exploded view of the key components (excluding the clamping assembly) of the inwardly folding edge mechanism.

[0026] Figure 7 It is a schematic diagram of the flaring mechanism structure.

[0027] Figure 8 It is a schematic diagram of the working state of the flaring mechanism.

[0028] Figure 9 It is a schematic diagram of the cutting blade Figure 1 .

[0029] Figure 10 It is a schematic diagram of the cutting blade Figure 2 .

[0030] Figure 11 Schematic diagram of the extrusion bearing Figure 1 .

[0031] Figure 12 Schematic diagram of the extrusion bearing Figure 2 .

[0032] Figure 13 Schematic diagram of the support bearing Figure 1 .

[0033] Figure 14 Schematic diagram of the support bearing Figure 2 .

[0034] The reference numerals are as follows: 1 is a pipe fitting, 11 is an inner flanging structure, 12 is a double-layer bell mouth structure, 2 is an inner flanging mechanism, 21 is a first clamping assembly, 22 is a second clamping assembly, 23 is a cutting assembly, 231 is a cutting blade, 24 is an extrusion assembly, 241 is an extrusion bearing, 242 is an extrusion surface, 25 is a support assembly, 251 is a support bearing, 252 is a support surface, 26 is a cutter head, 261 is a through hole, 262 is a slider, 263 is a gasket, 3 is a flaring mechanism, 31 is a third clamping assembly, 32 is a punch assembly, 321 is a conical punch, 41 is an upper clamping die, and 42 is a lower clamping die. Detailed implementation manners

[0035] The following further describes the detailed implementation manners of the present utility model with reference to the accompanying drawings. For the convenience of description, in the present utility model, the orientation or positional relationships indicated by terms such as "front", "rear", "front", "back", "left", "right", "top", "bottom", "upper", "lower", "inner", "outer", "inside", etc. are based on the orientation or positional relationships shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model and the actual orientation of the product or device during production, use, sales, etc. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Furthermore, in the embodiments of the present utility model, unless otherwise clearly specified and limited, terms such as "installation", "setting", "connection", "fixation", "composition", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0036] The present utility model provides a pipe end bell mouth forming device, which can be used for forming a double-layer bell mouth at the pipe end of the pipe fitting 1. As Figures 3 to 8As shown, the pipe end flared mouth forming device includes an inner flanging mechanism 2 and a flaring mechanism 3;

[0037] As Figures 3 to 6 shown, the inner flanging mechanism 2 includes a first clamping assembly 21, a second clamping assembly 22, a rotating assembly (not shown in the figure), a cutting assembly 23, and an extrusion assembly 24; the cutting assembly 23 and the extrusion assembly 24 are located between the first clamping assembly 21 and the second clamping assembly 22; the first clamping assembly 21 and the second clamping assembly 22 can be used to clamp the pipe fitting 1; the cutting assembly 23 can be used to cut the pipe wall of the pipe fitting 1; the extrusion assembly 24 is provided with an inclined extrusion surface 242 and can inwardly extrude the pipe wall of the pipe fitting 1 to form an inner flanging structure 11; in the present invention, the inner flanging structure 11 is as Figure 1 shown in the figure, and is a structure that gradually narrows towards the pipe mouth and has a trapezoidal cross-section; the cutting assembly 23 and the extrusion assembly 24 can act simultaneously for cutting and extrusion, or can act successively, first cutting and then extruding, and there is no limitation here; the rotating assembly can control the pipe fitting 1 to rotate around its axis, or can control the cutting assembly 23 and the extrusion assembly 24 to rotate around the pipe fitting 1, so that the cutting and extrusion of the pipe fitting 1 by the cutting assembly 23 and the extrusion assembly 24 are completed around the entire circumferential wall of the pipe fitting 1;

[0038] As Figures 7 to 8 shown, the flaring mechanism 3 includes a third clamping assembly 31 and a punch assembly 32; the third clamping assembly 31 can be used to clamp the pipe fitting 1; the punch assembly 32 is provided with a conical punch 321 coaxial with the pipe fitting 1, and the head diameter of the conical punch 321 is larger than the diameter of the pipe mouth of the pipe fitting 1 after inner flanging and smaller than the diameter of the pipe fitting 1; the conical punch 321 is located at the pipe mouth of the pipe fitting 1 and can move axially along the pipe fitting 1, approaching or moving away from the pipe mouth of the pipe fitting 1.

[0039] During blanking, the first clamping assembly 21 and the second clamping assembly 22 can clamp the uncut pipe fitting 1 material, and then the cutting assembly 23 and the extrusion assembly 24 perform cutting and extrusion on the pipe fitting 1 to complete the cutting and segmentation of the pipe fitting 1 and form an inner flanging structure 11 of the pipe mouth as Figure 1 shown in the figure; then the third clamping assembly 31 clamps the pipe fitting 1, and the conical punch 321 moves axially along the pipe fitting 1 towards the pipe mouth of the pipe fitting 1. At this time, the inner flanging structure 11 of the pipe mouth is subjected to an inward extrusion force and begins to fold inward, and at the same time, the conical surface of the conical punch 321 extrudes outward, and a double-layer flared mouth structure 12 of the pipe end can be formed; in the present invention, the double-layer flared mouth structure 12 is as Figure 2 shown in the figure, and is a flared mouth structure with a double-layer pipe wall.

[0040] For the pipe end flared mouth forming device adopting the above structure, by first extruding to form the inner folded edge structure 11 of the pipe orifice and then punching to form the double-layer flared mouth structure 12, compared with the single-layer flared mouth in the prior art, it has the following advantages: (1) greater strength and better pressure resistance, and it is not easy to crack or deform during installation or use, thus reducing the occurrence of leakage problems of the connecting pipe; (2) it is not easy to produce the situation of the pipe orifice curling when punching to form the double-layer flared mouth structure 12, which is beneficial to the quality consistency control; (3) after the double-layer flared mouth structure 12 is formed, the cutting part of the pipe orifice is folded into the pipe fitting 1, and at this time, the inner wall of the flared mouth is the smooth outer wall of the original pipe fitting 1, thereby reducing the probability of quality abnormalities such as indentation on the flared mouth, and further reducing the occurrence of leakage problems of the connecting pipe.

[0041] In some embodiments, such as Figure 11 , Figure 12 As shown, there are two extrusion surfaces 242 on the extrusion assembly 24. The two extrusion surfaces 242 are connected and symmetrical. The two extrusion surfaces 242 as a whole present a V-shaped structure protruding towards the pipe fitting 1, and the symmetry plane of the two extrusion surfaces 242 coincides with the cutting surface of the cutting assembly 23.

[0042] For the pipe end flared mouth forming device adopting the above structure, such as Figure 3 , Figure 5 , Figure 6 As shown, since the extrusion assembly 24 is provided with two connected and symmetrical extrusion surfaces 242, and the cutting surface of the cutting assembly 23 is located between the two extrusion surfaces 242, the extrusion assembly 24 can simultaneously extrude the end of the previous pipe fitting 1 and the front end of the next pipe fitting 1 to respectively form the inner folded edge structure 11 of the pipe orifice, which is applicable to the situation where the double-layer flared mouth structures 12 need to be formed at both ends of the pipe fitting 1, and can improve production efficiency and reduce production costs.

[0043] In some embodiments, the inner folded edge mechanism 2 further includes a breaking component (not shown in the figure); the breaking component can control the first clamping component 21 and / or the second clamping component 22 to move axially along the pipe fitting 1 and break the pipe fitting 1 at the cutting position. For example, the breaking component can simultaneously control the first clamping component 21 and the second clamping component 22 to move away from each other axially along the pipe fitting 1; or, the breaking component can only control the first clamping component 21 to move away from the cutting assembly 23 axially along the pipe fitting 1; or, the breaking component can also only control the second clamping component 22 to move away from the cutting assembly 23 axially along the pipe fitting 1.

[0044] The pipe end flaring device adopting the above structure can, by setting the breaking component, break the pipe fitting 1 axially from the cutting position after the cutting component 23 cuts the pipe wall thickness of the pipe fitting 1 to a certain extent (for example, cutting 75%-85% of the pipe wall thickness of the pipe fitting 1), so that the material of the pipe fitting 1 is divided into two sections; by the above way of combining cutting and breaking, the segmentation of the pipe fitting 1 is realized. Compared with direct cutting, it can effectively reduce the burrs at the pipe orifice and improve the production quality.

[0045] In some embodiments, as Figure 4 、 Figure 5 shown, the inner flanging mechanism 2 is further provided with a support component 25; the support component 25 and the extrusion component 24 are respectively located on both sides of the pipe fitting 1, and the support component 25 is provided with a support surface 252 tangent to the pipe wall of the pipe fitting 1. The support surface 252 can support the pipe fitting 1 when the cutting component 23 and the extrusion component 24 cut and extrude the pipe fitting 1, preventing it from shaking.

[0046] The pipe end flaring device adopting the above structure can, by setting the support component 25, prevent the pipe fitting 1 from shaking and shifting in position during cutting and extrusion, which may affect the cutting and extrusion effects, improve the reliability of the pipe end flaring device, and improve the production quality.

[0047] In some embodiments, as Figures 4 to 6 shown, the inner flanging mechanism 2 is further provided with a cutter disc 26; the cutter disc 26 is perpendicular to the axis of the pipe fitting 1, and a through hole 261 allowing the pipe fitting 1 to pass through is provided at the center of the cutter disc 26; the cutting component 23, the extrusion component 24, and the support component 25 are installed on the cutter disc 26, and the rotating component can control the cutter disc 26 to rotate around the pipe fitting 1.

[0048] The pipe end flaring device adopting the above structure can, by setting the cutter disc 26, installing the cutting component 23, the extrusion component 24, and the support component 25 on the cutter disc 26, and controlling the cutter disc 26 to rotate around the pipe fitting 1 through the rotating component, realize the cutting, extrusion, and support of the pipe fitting 1, improve the production efficiency, and reduce the production cost.

[0049] In some embodiments, as Figure 6 shown, the cutting component 23, the extrusion component 24, and the support component 25 are installed on the cutter disc 26 through sliders 262, and the sliders 262 can move radially on the cutter disc 26 towards the through hole 261.

[0050] The pipe end flaring forming device adopting the above structure can make the processing more accurate and is beneficial to improving the production quality by setting a slider 262 that can move radially towards the through hole 261 on the cutter head 26. After the pipe fitting 1 is fed to a specific station and clamped, by controlling the slider 262 to move radially towards the through hole 261, the cutting assembly 23, the extrusion assembly 24, and the support assembly 25 can reach specific stations.

[0051] In some embodiments, as Figure 6 shown, a gasket 263 is provided at the bottom of the cutting assembly 23 and / or the extrusion assembly 24 and / or the support assembly 25. Specifically, any one, any two, or all three of the cutting assembly 23, the extrusion assembly 24, and the support assembly 25 can be provided with the gasket 263 at the bottom; the gasket 263 can adjust the distance between the cutting assembly 23 and / or the extrusion assembly 24 and / or the support assembly 25 and the cutter head 26.

[0052] For the pipe end flaring forming device adopting the above structure, through the setting of the gasket 263, when the central planes of the cutting assembly 23, the extrusion assembly 24, and the support assembly 25 are not in the same plane, the distance between the cutting assembly 23 and / or the extrusion assembly 24 and / or the support assembly 25 and the cutter head 26 can be adjusted through the gasket 263, so that the central planes of the cutting assembly 23, the extrusion assembly 24, and the support assembly 25 are located in the same plane, which can improve the production quality.

[0053] In some embodiments, as Figure 9 、 Figure 10 shown, the cutting assembly 23 includes a disc-shaped cutting blade 231, and the cutting blade 231 can cut the pipe wall of the pipe fitting 1.

[0054] For the pipe end flaring forming device adopting the above structure, the disc-shaped cutting blade 231 is used to cut the pipe wall of the pipe fitting 1, which has a simple structure, good cutting effect, and low cost.

[0055] In some embodiments, as Figure 11 、 Figure 12 shown, the extrusion assembly 24 includes an extrusion bearing 241, and the side surface of the extrusion bearing 241 is a conical surface structure, and this conical surface structure is the extrusion surface 242 of the extrusion bearing 241; specifically, as shown in this embodiment, the side surface of the extrusion bearing 241 can be two connected and symmetric conical surface structures, and at this time, the extrusion surface 242 of the extrusion bearing 241 is two; of course, there can also be only one conical surface structure on the left or right, and at this time, the extrusion surface 242 of the extrusion bearing 241 is one.

[0056] The pipe end flaring forming device adopting the above structure extrudes the pipe wall of the pipe fitting 1 by using the extrusion bearing 241, which has a simple structure, good extrusion effect and low cost.

[0057] In some embodiments, such as Figure 13 , Figure 14 As shown, the support assembly 25 includes a support bearing 251. The side surface of the support bearing 251 is a planar structure tangent to the pipe wall of the pipe fitting 1, and this planar structure is the support surface 252 of the support bearing 251, which can support the pipe wall of the pipe fitting 1.

[0058] The pipe end flaring forming device adopting the above structure supports the pipe wall of the pipe fitting 1 by using the support bearing 251, which has a simple structure, good support effect and low cost.

[0059] In some embodiments, such as Figure 3 , Figure 7 As shown, the first clamping assembly 21 and / or the second clamping assembly 22 and / or the third clamping assembly 31 are composed of an upper clamping die 41 and a lower clamping die 42. Specifically, any one or any two of the first clamping assembly 21, the second clamping assembly 22, and the third clamping assembly 31 can be composed of the upper clamping die 41 and the lower clamping die 42, or as shown in this embodiment, all three of the first clamping assembly 21, the second clamping assembly 22, and the third clamping assembly 31 are composed of the upper clamping die 41 and the lower clamping die 42; arc-shaped grooves adapted to the pipe wall of the pipe fitting 1 are provided in the upper clamping die 41 and the lower clamping die 42, and the upper clamping die 41 and the lower clamping die 42 can approach or move away from each other.

[0060] The pipe end flaring forming device adopting the above structure can stably and firmly clamp the pipe fitting 1 by providing arc-shaped grooves adapted to the pipe wall of the pipe fitting 1 in the upper clamping die 41 and the lower clamping die 42, and the upper clamping die 41 and the lower clamping die 42 can approach or move away from each other. The clamping effect is good, the reliability of the pipe end flaring forming device can be improved, and the production quality can be enhanced.

[0061] The above embodiments are only preferred embodiments of the present invention, and do not limit the implementation scope of the present invention. Any equivalent changes made according to the shape, structure and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A tube end flaring device for forming a double-layer flared structure (12) at the tube end of a pipe fitting (1), characterized in that, It includes an inner flanging mechanism (2) and a flaring mechanism (3); The inner flanging mechanism (2) includes an extrusion assembly (24). The extrusion assembly (24) is provided with an inclined extrusion surface (242), which can extrude the pipe wall of the pipe fitting (1) inward to form an inner flanging structure (11) at the pipe orifice; The flaring mechanism (3) includes a punch assembly (32). The punch assembly (32) is provided with a conical punch (321) coaxial with the pipe fitting (1). The head diameter of the conical punch (321) is larger than the diameter of the pipe orifice after inner flanging of the pipe fitting (1) and smaller than the diameter of the pipe fitting (1); the conical punch (321) is located at the pipe orifice of the pipe fitting (1) and can move axially along the pipe fitting (1).

2. The tube end flaring device according to claim 1, wherein The inner flanging mechanism (2) further includes a first clamping assembly (21), a second clamping assembly (22), a rotating assembly and a cutting assembly (23). The cutting assembly (23) and the extrusion assembly (24) are located between the first clamping assembly (21) and the second clamping assembly (22); the first clamping assembly (21) and the second clamping assembly (22) can clamp the pipe fitting (1); the cutting assembly (23) can cut the pipe wall of the pipe fitting (1); the rotating assembly can control the pipe fitting (1) to rotate around its axis or control the cutting assembly (23) and the extrusion assembly (24) to rotate around the axis of the pipe fitting (1); the flaring mechanism (3) further includes a third clamping assembly (31) that can clamp the pipe fitting (1).

3. The tube-end bell mouth forming device according to claim 2, wherein, The extrusion assembly (24) is provided with two connected and symmetric extrusion surfaces (242). The two extrusion surfaces (242) as a whole form a V-shaped structure protruding towards the pipe fitting (1), and the symmetry plane of the two extrusion surfaces (242) coincides with the cutting surface of the cutting assembly (23).

4. The tube end flaring device according to claim 2, wherein, The inner flanging mechanism (2) further includes a breaking component; the breaking component can control the first clamping assembly (21) and / or the second clamping assembly (22) to move axially along the pipe fitting (1) and break the pipe fitting (1) from the cutting position.

5. The tube end flaring device according to claim 2, characterized in that, The inner flanging mechanism (2) is further provided with a support assembly (25); the support assembly (25) and the extrusion assembly (24) are respectively located on both sides of the pipe fitting (1), and the support assembly (25) is provided with a support surface (252) tangent to the pipe wall of the pipe fitting (1).

6. The tube end flare forming device according to claim 5, characterized in that, The inner flanging mechanism (2) is further provided with a cutter disc (26) perpendicular to the axis of the pipe fitting (1); a through hole (261) through which the pipe fitting (1) can pass is provided at the center of the cutter disc (26); the cutting assembly (23), the extrusion assembly (24), and the support assembly (25) are installed on the cutter disc (26), and the rotating assembly can control the cutter disc (26) to rotate around the pipe fitting (1).

7. The tube end flaring device according to claim 6, wherein, The cutting assembly (23), the extrusion assembly (24), and the support assembly (25) are installed on the cutter disc (26) through sliders (262), and the sliders (262) can move radially on the cutter disc (26) towards the through hole (261).

8. The tube end flaring device according to claim 6, characterized in that, A gasket (263) is provided at the bottom of the cutting assembly (23) and / or the extrusion assembly (24) and / or the support assembly (25), and the gasket (263) can adjust the distance between the cutting assembly (23) and / or the extrusion assembly (24) and / or the support assembly (25) and the cutter head (26).

9. The tube end flaring device according to any one of claims 2-8, characterized in that The cutting assembly (23) includes a disc-shaped cutting blade (231), and the cutting blade (231) can cut the pipe wall of the pipe fitting (1).

10. The tube end flaring device according to any one of claims 1-8, characterized in that, The extrusion assembly (24) includes an extrusion bearing (241), and the side surface of the extrusion bearing (241) is a conical surface structure.

11. The tube end flaring device according to any one of claims 5-8, characterized in that, The support assembly (25) includes a support bearing (251), and the side surface of the support bearing (251) is a planar structure tangent to the pipe wall of the pipe fitting (1).

12. The tube end bell mouth forming device according to any one of claims 2-8, characterized in that, The first clamping assembly (21) and / or the second clamping assembly (22) and / or the third clamping assembly (31) is composed of an upper clamping die (41) and a lower clamping die (42). Arc-shaped grooves adapted to the pipe wall of the pipe fitting (1) are provided in the upper clamping die (41) and the lower clamping die (42), and the upper clamping die (41) and the lower clamping die (42) can approach or move away from each other.

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