Pipe fitting bidirectional in-hole flanging device

Abstract

The utility model relates to the technical field of flanging devices, in particular to a pipe fitting bidirectional in-hole flanging device. An upper die assembly is arranged above a lower die assembly; the lower die assembly comprises a lower die base and a supporting column, the die core assembly comprises a supporting piece, a rotating pin, a connecting piece and a female die core, and the axis of the rotating pin is perpendicular to the plane where the front end face of the supporting piece is located. One end of the connecting piece is rotationally connected with the rotating pin, and the other end of the connecting piece is fixedly connected with the female die core; the female die core is located above the supporting column, and the upper end face of the supporting column abuts against the bottom end face of the female die core to support the female die core. The upper die assembly comprises an upper die base and a hole flanging assembly, the hole flanging assembly comprises a punch arranged in a protruding mode in the direction of the female die core, and the position of the punch corresponds to the position of the supporting column. According to the pipe fitting two-way hole inner flanging device, suspended operation of the female die core can be avoided, the supporting stability of the female die core is improved, the service life is prolonged, meanwhile, a pipe fitting enters and exits the female die core conveniently and smoothly, and the problem that the female die core is prone to damage due to the small thickness and low supporting strength is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of flanging devices, in particular to a bidirectional inner-hole flanging device for a pipe fitting. Background Art

[0002] Stainless steel manifolds are common pipe fittings used extensively in schools, shopping malls, residential communities, and other areas. The manifold features multiple, equally spaced, inward-turned holes arranged on the sidewalls of the fittings. These holes, with threaded holes, are used to connect to the diversion pipes. The sheet metal flanging process involves pre-punching the metal sheet, then flanging the pre-punched holes through a process called stretching.

[0003] When performing an inward-turning operation on a pipe fitting, it is also necessary to set a turning punch and a turning die to provide opposing forces to each other. When performing an inward-turning operation on multiple equidistant pre-punched holes on a pipe fitting, there needs to be an avoidance space for extracting the pipe fitting after the turning. Therefore, the core thickness of the existing pipe turning device or flanging mold is generally small, which makes it easy to extract the pipe fitting from the core after the turning. However, due to the small thickness of the core, the support strength of the core is low and it is easy to be damaged. Utility Model Content

[0004] The main purpose of the utility model is to provide a two-way inner flanging device for pipe fittings, which avoids the suspended operation of the die core, improves the support stability of the die core, and prolongs the service life. At the same time, the pipe fittings can enter and exit the die core conveniently and smoothly, and solves the problem that the die core is easy to be damaged due to its low support strength due to its small thickness.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes a two-way inner flanging device for pipe fittings, comprising an upper mold assembly, a lower mold assembly and a mold core assembly, wherein the upper mold assembly is arranged above the lower mold assembly; the lower mold assembly comprises a lower mold base and a support column, one end of the support column is fixedly connected to the lower mold base, and the other end of the support column protrudes from the lower mold base toward the direction of the upper mold assembly; the mold core assembly comprises a support member, a turn pin, a connecting member and a concave mold core, one end of the support member is detachably connected to the lower mold base, and the other end of the support member is horizontally extended in the direction away from the lower mold base; the turn pin is fixedly connected to the support away from the lower mold base At one end of the lower die base, the axis of the turn pin and the plane where the front end face of the support member are located are perpendicular to each other; one end of the connecting member is rotatably connected to the turn pin, and the other end of the connecting member is fixedly connected to the die core; and the die core is located above the support column, and the upper end face of the support column is against the bottom end face of the die core to support the die core; the upper die assembly includes an upper die base and a hole-turning assembly, and the hole-turning assembly is connected to the lower surface of the upper die base, and the hole-turning assembly includes a punch protruding toward the die core, the punch matches the die core, and the position of the punch is set corresponding to the position of the support column.

[0006] Optionally, the die core includes a connecting portion and a punching portion, one end of the connecting portion is fixedly connected to an end of the connecting member away from the turn pin, and the other end of the connecting portion is fixedly connected to the punching portion, and the horizontal plane height of the upper end surface of the connecting portion is lower than the horizontal plane height of the upper end surface of the punching portion; a die hole is provided on the end surface of the punching portion away from the support column, the position of the punch is set corresponding to the position of the die hole, and the support column is located directly below the die hole.

[0007] Optionally, the support member includes a support plate and a fixed block, one end of the support plate is detachably connected to the lower mold base, and the other end of the support plate is horizontally extended in the direction away from the lower mold base; the fixed block is fixedly connected to the end of the support plate away from the support column; the upper end surface of the fixed block is provided with a groove, one end of the turn pin is fixedly connected to the front side wall of the fixed block, and the other end of the turn pin extends into the groove and is fixedly connected to the rear side wall of the fixed block; the end of the connecting member away from the die core is arranged in the groove and is rotatably connected to the turn pin.

[0008] Optionally, the connecting member includes a rotating block and a connecting rod, one end of the rotating block is arranged in the groove and is rotatably connected to the rotating pin, the other end of the rotating block is fixedly connected to the connecting rod, and the end of the connecting rod away from the rotating block is fixedly connected to the die core; the front and rear wall surfaces of the rotating block are respectively abutted against the two inner wall surfaces of the groove; the end of the fixed block away from the die core is also provided with a rotating inclined surface, one end of the rotating inclined surface is connected to the lower wall surface of the groove, and the other end of the rotating inclined surface is inclined downward in the direction away from the die core; the axis of the rotating pin is located directly above the position where the rotating inclined surface is connected to the lower wall surface of the groove.

[0009] Optionally, the core mold assembly further includes a locating pin, one end of which is fixedly connected to the die core, the other end of which protrudes upward toward the upper mold base, and the locating pin is located on the side of the die core away from the turn pin.

[0010] Optionally, the mold core assembly further includes a positioning block, which is detachably connected to the upper surface of the support plate and is located between the fixed block and the female mold core.

[0011] Optionally, the upper mold assembly also includes a pressure plate and an elastic member, and the pressure plate is floatingly connected to the upper mold base; one end of the elastic member is fixedly connected to the lower surface of the upper mold base, and the other end of the elastic member is fixedly connected to the upper surface of the pressure plate; a first avoidance through hole for the punch to pass through is provided on the pressure plate, and the end of the punch away from the upper mold base is located in the first avoidance through hole, and the lower end face of the punch is flush with the lower end face of the pressure plate.

[0012] Optionally, the hole-turning assembly also includes an upper fixed plate, which is connected to the lower surface of the upper die base, one end of the punch is fixedly connected to the upper fixed plate, and the other end of the punch is protruding toward the direction of the die core; the upper fixed plate is provided with a second avoidance hole for the elastic member to pass through, and the end of the elastic member away from the pressure plate passes through the second avoidance hole and is fixedly connected to the upper die base, and there is a moving gap between the upper fixed plate and the pressure plate.

[0013] Optionally, the hole-turning assembly further includes a guide column, one end of which is fixedly connected to the upper fixed plate, and the other end of the guide column passes through the pressure plate and protrudes toward the lower die base; the lower die assembly further includes a lower fixed plate, which is fixedly connected to the upper surface of the lower die base, one end of the support column is fixedly connected to the lower fixed plate, and the other end of the support column protrudes toward the die core; the lower fixed plate is provided with a first guide hole on the end face facing the upper fixed plate, and the guide column is arranged corresponding to the first guide hole.

[0014] Optionally, the lower mold assembly also includes two guide plates, which are detachably connected to the upper surface of the lower fixed plate, and the two guide plates are respectively located on both sides of the support column, and the die core is located between the two guide plates; the first guide hole is arranged on the side of the guide plate away from the support column.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. By arranging the support column to support the die core, the die core can be supported, thereby preventing the die core from being suspended in the air, improving the support stability of the die core, extending the service life of the die core, and solving the problem of the die core being easily damaged due to its small thickness and low support strength.

[0017] 2. The connecting piece and the die core are arranged to be rotated around the rotating pin and lifted, so that the pipe fitting can be easily lifted. When the pipe fitting is lifted until the supporting column leaves the pre-punched hole corresponding to the bottom of the pipe fitting, the bottom end surface of the inner cavity of the pipe fitting fits with the bottom end surface of the die core, so that the pipe fitting can be pushed in and out of the die core conveniently and smoothly.

[0018] 3. The pressing plate and the upper die seat are in floating connection, which realizes elastic demoulding and unloading between the punch and the pipe fitting; the pressing plate and the guide plate are pressed and fitted tightly to realize the leveling operation of the upper end surface of the pipe fitting.

[0019] 4. The guide plate also serves to axially position the pipe, so that the spool alignment is accurate when the pipe is pushed forward.

[0020] 5. By setting the positioning pin and the positioning block, when the pipe is subjected to the inner flanging operation, the next pre-punched hole to be operated is used to position the previous pre-punched hole to be operated. The last pre-punched hole at the tail of the pipe is positioned by the end of the pipe being against the positioning block, so that the hole spacing of the pipe is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of a bidirectional inner flanging device for a pipe fitting according to an embodiment of the present invention (a cross-sectional view showing the state when the upper die assembly and the lower die assembly are closed);

[0022] Figure 2 This is a structural schematic diagram of an upper die assembly and a lower die assembly of a two-way inner flanging device for a pipe fitting according to an embodiment of the present invention when they are in a closed state;

[0023] Figure 3 This is a front view of the bidirectional inner flanging device for pipe fittings according to one embodiment of the present invention with the guide pin hidden (a cross-sectional view showing the upper and lower die assemblies opened);

[0024] Figure 4 This is a structural schematic diagram of the upper die assembly and the lower die assembly of the bidirectional inner flanging device for a pipe fitting according to one embodiment of the present invention in an open state (one of the guide plates is hidden);

[0025] Figure 5 for Figure 1 A magnified schematic diagram of point A in the middle;

[0026] Figure 6 for Figure 1 The enlarged schematic diagram of point B in the middle;

[0027] Figure 7 This is a side view (cross-sectional view, the state when the upper mold assembly and the lower mold assembly are closed) of the two-way internal flanging device for pipe fittings according to one embodiment of the present invention, with the elastic member hidden.

[0028] Description of the accompanying symbols: upper die assembly 1, upper die base 11, fixing groove 111, hole-turning assembly 12, punch 121, upper fixing plate 122, second avoidance through hole 1221, guide column 123, pressure plate 13, first avoidance through hole 131, elastic member 14, moving gap 15, lower die assembly 2, lower die base 21, supporting column 22, lower fixing plate 23, first guide hole 231, guide sleeve 232, pad 24, first Two guide holes 241, guide plate 25, core mold assembly 3, support member 31, support plate 311, mounting hole 3111, fixing block 312, groove 3121, rotating inclined surface 3122, rotating pin 32, connecting member 33, rotating block 331, connecting rod 332, die core 34, connecting part 341, flipping hole part 342, die hole 3421, avoidance space 343, positioning pin 35, positioning block 36, pipe fitting 4. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, fixed connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0032] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or solutions that meet both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0033] To solve the above technical problems, please refer to Figures 1 to 4 The utility model proposes a bidirectional inner flanging device for a pipe fitting, comprising an upper die assembly 1, a lower die assembly 2 and a core die assembly 3, wherein the upper die assembly 1 is arranged above the lower die assembly 2;

[0034] The lower mold assembly 2 includes a lower mold base 21 and a support column 22, one end of the support column 22 is fixedly connected to the lower mold base 21, and the other end of the support column 22 is protruded from the lower mold base 21 toward the direction of the upper mold assembly 1;

[0035] The mold core assembly 3 includes a support member 31, a rotation pin 32, a connecting member 33 and a female mold core 34, one end of the support member 31 is detachably connected to the lower mold base 21, and the other end of the support member 31 is horizontally extended in the direction away from the lower mold base 21; the rotation pin 32 is fixedly connected to the end of the support member 31 away from the lower mold base 21, and the axis of the rotation pin 32 is perpendicular to the plane where the front end surface of the support member 31 is located; one end of the connecting member 33 is rotatably connected to the rotation pin 32, and the other end of the connecting member 33 is fixedly connected to the female mold core 34; and the female mold core 34 is located above the supporting column 22, and the upper end surface of the supporting column 22 is against the bottom end surface of the female mold core 34 to support the female mold core 34;

[0036] The upper die assembly 1 includes an upper die base 11 and a hole-turning assembly 12. The hole-turning assembly 12 is connected to the lower surface of the upper die base 11. The hole-turning assembly 12 includes a punch 121 protruding toward the die core 34. The punch 121 matches the die core 34, and the position of the punch 121 corresponds to the position of the support column 22.

[0037] When the bidirectional inner flanging device for pipe fittings of the present invention is used, the pipe fitting 4 to be flanging is placed on the outside of the die core 34 and the connector 33, and the pipe fitting 4 is pushed in the direction from the die core 34 to the connector 33 or pushed out in the opposite direction. It should be noted that a plurality of equally spaced pre-punched holes (such as Figure 5 As shown, a plurality of equally spaced pre-punched holes are symmetrically distributed on the opposite wall surfaces of the tube 4 , and the thickness of the die core 34 should be smaller than the inner diameter height of the tube 4 after being turned inward.

[0038] See also Figures 1 to 2 When performing the internal flanging operation on the pipe fitting 4, the pipe fitting 4 is inserted into the die core 34, and the support column 22 is aligned with the pre-punched hole at the bottom of the pipe fitting 4. Under the action of gravity, the support column 22 passes through the pre-punched hole at the bottom of the pipe fitting 4 and enters the inner cavity of the pipe fitting 4. The upper end surface of the support column 22 abuts against the die core 34, and the top surface of the inner cavity of the pipe fitting 4 fits with the top surface of the die core 34. The upper die assembly 1 moves downward, and the punch 121 punches into the die core 34 to perform the internal flanging operation on the pipe fitting 4. By providing the support column 22 to abut against the die core 34, the die core 34 can be supported, preventing the die core 34 from being suspended during operation, improving the support stability of the die core 34, extending the service life of the die core 34, and solving the problem of the die core 34 being easily damaged due to its small thickness and low support strength.

[0039] By configuring the core assembly 3 to include a support member 31, a rotation pin 32, a connecting member 33, and a female mold core 34, when the pipe 4 needs to be pushed in or out of the female mold core 34, since the axis of the rotation pin 32 is perpendicular to the plane where the front end surface of the support member 31 is located, the connecting member 33 and the female mold core 34 can be rotated around the rotation pin 32 and lifted, so that the pipe 4 can be rotated and lifted upward relative to the lower mold base 21. Figure 3 , the pipe fitting 4 is lifted until the support column 22 leaves the corresponding pre-punched hole at the bottom of the pipe fitting 4. At this time, the bottom end surface of the inner cavity of the pipe fitting 4 is in contact with the bottom end surface of the die core 34, and the protruding part of the top of the pipe fitting 4 after being turned inward is located above the die core 34, avoiding interference between the protruding part of the top of the pipe fitting 4 after being turned inward and the die core 34, so that the pipe fitting 4 can be pushed in and out of the die core 34 conveniently and smoothly.

[0040] It should be noted that when performing the inner flanging operation, there is also a gap between the bottom end surface of the pipe fitting 4 and the lower die base 21. When the upper die assembly 1 moves downward and performs the inner flanging operation on the pipe fitting 4, the bottom of the pipe fitting 4 is in a suspended state, which can prevent the bottom of the pipe fitting 4 from being deformed due to improper force.

[0041] See also Figure 5 The die core 34 includes a connecting portion 341 and a hole-turning portion 342. One end of the connecting portion 341 is fixedly connected to the end of the connecting member 33 away from the rotating pin 32. The other end of the connecting portion 341 is fixedly connected to the hole-turning portion 342. The horizontal plane height of the upper end surface of the connecting portion 341 is lower than the horizontal plane height of the upper end surface of the hole-turning portion 342.

[0042] A die hole 3421 is formed on the end surface of the hole-turning portion 342 away from the supporting column 22 . The position of the punch 121 corresponds to the position of the die hole 3421 , and the supporting column 22 is located directly below the die hole 3421 .

[0043] During the inner flanging operation, the pipe fitting 4 is pushed from left to right toward the direction close to the turn pin 32, and the inner flanging operation is performed on the pre-punched hole at the top of the rightmost side of the pipe fitting 4 first, and the inner flanging operation is performed on the pre-punched holes at each top in turn when the pipe fitting 4 is pushed from left to right. By setting the horizontal plane height of the upper end face of the connecting portion 341 to be lower than the horizontal plane height of the upper end face of the flanging portion 342, an avoidance space 343 can be formed, so that the protruding part of the pre-punched hole that has completed the operation is located in the avoidance space 343, so as to avoid affecting the inner flanging operation of the next pre-punched hole.

[0044] See also Figure 2 and Figure 4 The support member 31 includes a support plate 311 and a fixing block 312. One end of the support plate 311 is detachably connected to the lower mold base 21, and the other end of the support plate 311 is horizontally extended in a direction away from the lower mold base 21; the fixing block 312 is fixedly connected to the end of the support plate 311 away from the support column 22;

[0045] A groove 3121 is provided on the upper end surface of the fixed block 312, one end of the turn pin 32 is fixedly connected to the front side wall of the fixed block 312, and the other end of the turn pin 32 extends into the groove 3121 and is fixedly connected to the rear side wall of the fixed block 312; the end of the connecting member 33 away from the die core 34 is arranged in the groove 3121 and is rotatably connected to the turn pin 32.

[0046] By setting the support plate 311 and the lower die base 21 in a detachable connection, it is convenient to quickly replace the core mold assembly 3. When it is necessary to perform internal flanging operations on pipes 4 of different specifications, the support plate 311 and the lower die base 21 can be directly disassembled to replace the appropriate core mold assembly 3, which helps to improve the adaptability and practicality of the bidirectional hole internal flanging device of the pipe fitting.

[0047] By opening the groove 3121 on the fixed block 312, the connecting member 33 is rotatably connected to the rotating pin 32 in the groove 3121, which can improve the stability of the connecting member 33 and the die core 34 during rotation and avoid the connecting member 33 from shaking significantly in the horizontal direction.

[0048] See also Figure 2 、 Figure 4 and Figure 6 The connecting member 33 includes a rotating block 331 and a connecting rod 332. One end of the rotating block 331 is disposed in the groove 3121 and is rotatably connected to the rotating pin 32. The other end of the rotating block 331 is fixedly connected to the connecting rod 332. The end of the connecting rod 332 away from the rotating block 331 is fixedly connected to the die core 34. The front and rear walls of the rotating block 331 are respectively in contact with the two inner wall surfaces of the groove 3121.

[0049] A rotating inclined surface 3122 is further provided at one end of the fixed block 312 away from the die core 34, one end of the rotating inclined surface 3122 is connected to the lower wall of the groove 3121, and the other end of the rotating inclined surface 3122 is tilted downward in the direction away from the die core 34; the axis of the rotating pin 32 is located directly above the position where the rotating inclined surface 3122 is connected to the lower wall of the groove 3121.

[0050] To further explain, the rotating block 331 is provided with a pin hole for the rotating pin 32 to pass through.

[0051] By setting the rotating block 331 in the groove 3121 and rotatably connected to the rotating pin 32, the front and rear walls of the rotating block 331 respectively abut against the inner wall surfaces opposite to the groove 3121, so that the groove 3121 can limit the rotating block 331 in the horizontal direction, thereby improving the stability between the connecting member 33 and the fixed block 312 and avoiding large-scale shaking of the connecting member 33 in the horizontal direction.

[0052] See also Figure 6 By setting the rotating inclined surface 3122, the axis of the rotating pin 32 is located directly above the position where the rotating inclined surface 3122 is connected to the lower wall of the groove 3121. When the rotating block 331 rotates, the rotating inclined surface 3122 can provide a rotating space for the rotating block 331, so that the rotating block 331 can rotate smoothly; at the same time, by setting the inclination angle of the rotating inclined surface 3122, the rotation range of the rotating block 331 can be limited to avoid affecting the operation safety due to excessive rotation range.

[0053] See also Figure 5The core assembly 3 also includes a positioning pin 35, one end of which is fixedly connected to the die core 34, and the other end of the positioning pin 35 is protruded upward toward the upper die base 11, and the positioning pin 35 is located on the side of the die core 34 away from the turn pin 32.

[0054] When the pre-punched holes on the pipe fitting 4 are internally flanging, each pre-punched hole needs to be internally flanging one by one. When it is necessary to position a pre-punched hole to be operated on the pipe fitting 4, the positioning pin 35 is set and inserted into the next pre-punched hole, and the pipe fitting 4 is slightly pushed so that it abuts against the edge of the next pre-punched hole and the positioning pin 35 for positioning. When in use, the pipe fitting 4 is pushed toward the direction close to the fixed block 312, and the position of the positioning pin 35 is observed from the next pre-punched hole, thereby realizing the rapid positioning of the pre-punched hole to be operated. The support column 22 can be quickly and accurately inserted into the corresponding pre-punched hole at the bottom of the pipe fitting 4, so that the hole spacing of the pipe fitting 4 is accurately positioned when the internal flanging operation is performed, and the operation efficiency is high.

[0055] See also Figure 2 and Figure 4 The core mold assembly 3 further includes a positioning block 36 , which is detachably connected to the upper surface of the support plate 311 , and the positioning block 36 is located between the fixing block 312 and the female mold core 34 .

[0056] The positioning block 36 is used to position the end of the pipe 4. When the last pre-punched hole on the pipe 4 is flanging, the pipe 4 is pushed from left to right toward the direction close to the turn pin 32 until the end of the pipe 4 abuts against the positioning block 36, thereby completing the positioning of the last pre-punched hole in the pipe 4.

[0057] When performing the inner flanging operation, the positioning pin 35 is inserted into the next pre-punched hole, and the pipe 4 is slightly pushed so that it abuts against the edge of the next pre-punched hole and the positioning pin 35 to achieve positioning of the previous pre-punched hole to be operated on the pipe 4; after completion, the pipe 4 is lifted upward, and the die core 34 and the connecting member 33 are rotated upward around the rotating pin 32. When the bottom surface of the pipe 4 leaves the support column 22 (as shown in FIG. Figure 2 As shown), push the pipe fitting 4 toward the direction of the connecting member 33 by one hole pitch, repeat the above positioning action to perform the inner flanging operation of the next pre-punching hole, and when the operation reaches the last pre-punching hole at the tail of the pipe fitting 4, push the end of the pipe fitting 4 to abut against the positioning block 36 to complete the inner flanging operation of the last pre-punching hole.

[0058] When it is necessary to perform an inner flanging operation on the pre-punched holes on the bottom surface of the pipe fitting 4 , the pipe fitting 4 can be turned around and the above-mentioned operation can be repeated until all the pre-punched holes on the pipe fitting 4 have completed the inner flanging operation.

[0059] For further explanation, see Figure 2 and Figure 4 The upper surface of the support plate 311 may be provided with a plurality of mounting holes 3111 at intervals for mounting the positioning blocks 36. During use, the mounting position of the positioning blocks 36 may be adjusted as needed to accommodate pipes 4 of varying lengths, or the positioning blocks 36 may be replaced to accommodate pipes 4 of varying specifications. Preferably, the positioning blocks 36 may be fixedly connected to the support plate 311 by bolts.

[0060] See also Figures 3 to 5 The upper mold assembly 1 further includes a pressing plate 13 and an elastic member 14. The pressing plate 13 is floatingly connected to the upper mold base 11. One end of the elastic member 14 is fixedly connected to the lower surface of the upper mold base 11, and the other end of the elastic member 14 is fixedly connected to the upper surface of the pressing plate 13.

[0061] The pressing plate 13 is provided with a first avoidance hole 131 for the punch 121 to pass through. The end of the punch 121 away from the upper die base 11 is located in the first avoidance hole 131 , and the lower end surface of the punch 121 is flush with the lower end surface of the pressing plate 13 .

[0062] By setting a floating connection between the pressure plate 13 and the upper die base 11, when the tube 4 needs to be flanging, the upper die assembly 1 moves downward, and the pressure plate 13 moves downward with the die and elastically contacts the upper surface of the tube 4, thereby achieving a clamping action on the tube 4. The upper die assembly 1 continues to move downward, and the elastic member 14 is compressed. Subsequently, the punch 121 passes through the first avoidance hole 131 and enters the die core 34 to achieve the flanging of the tube 4. After the flanging is completed, the upper die assembly 1 moves upward, and the elastic member 14 rebounds to force the tube 4 to separate from the punch 121, thereby successfully completing the demolding of the tube 4.

[0063] By setting the first avoidance through hole 131, and making the end of the punch 121 away from the upper die base 11 located in the first avoidance through hole 131, and the lower end surface of the punch 121 is flush with the lower end surface of the pressure plate 13, the end of the punch 121 away from the upper die base 11 can be hidden in the first avoidance through hole 131, which can effectively protect the punch 121 and avoid unnecessary collisions that may cause damage to the punch 121.

[0064] Preferably, the elastic member 14 is a spring or other elastic rubber member. Preferably, the number of the elastic members 14 can be set to multiple, and the multiple elastic members 14 are symmetrically arranged around the punch 121 to help improve stability.

[0065] See also Figures 3 to 5 The punch assembly 12 further includes an upper fixing plate 122, which is connected to the lower surface of the upper die base 11. One end of the punch 121 is fixedly connected to the upper fixing plate 122, and the other end of the punch 121 is protruding toward the direction of the die core 34.

[0066] See also Figure 5 and Figure 7 The upper fixed plate 122 is provided with a second avoidance hole 1221 for the elastic member 14 to pass through. The end of the elastic member 14 away from the pressing plate 13 passes through the second avoidance hole 1221 and is fixedly connected to the upper mold base 11. There is a moving gap 15 between the upper fixed plate 122 and the pressing plate 13.

[0067] By providing the second avoidance through hole 1221 on the upper fixing plate 122 , the elastic member 14 can be guided and limited, thereby improving the stability of the elastic member 14 and the pressing plate 13 when they are pressed downward.

[0068] See also Figure 7 , further explained, the surface of the upper mold base 11 facing the die core 34 is also provided with a fixing groove 111, and the elastic member 14 is fixedly connected in the fixing groove 111, which can further improve the stability of the elastic member 14 and the pressure plate 13 when pressed down.

[0069] See also Figure 2 and Figure 4 The hole-turning assembly 12 further includes a guide column 123, one end of which is fixedly connected to the upper fixing plate 122, and the other end of which passes through the pressing plate 13 and protrudes toward the lower die base 21;

[0070] The lower mold assembly 2 also includes a lower fixed plate 23, which is fixedly connected to the upper surface of the lower mold base 21. One end of the support column 22 is fixedly connected to the lower fixed plate 23, and the other end of the support column 22 is protruded toward the direction of the die core 34; the lower fixed plate 23 is provided with a first guide hole 231 on the end surface facing the upper fixed plate 122, and the guide column 123 is arranged corresponding to the first guide hole 231.

[0071] It should be noted that the pressure plate 13 is provided with a through hole for the guide column 123 to pass through. When the upper mold assembly 1 is pressed down, the guide column 123 is first inserted into the first guide hole 231 for positioning, and then the punch 121 punches into the die core 34 to perform the inner flanging operation, which helps to improve the stability of the inner flanging operation of the pipe 4.

[0072] Further explanation: the number of the guide pillars 123 is set to two, the two guide pillars 123 are respectively located on both sides of the punch 121, and the die core 34 is located between the two guide pillars 123; the number of the first guide holes 231 is equal to the number of the guide pillars 123, and the guide pillars 123 and the first guide holes 231 are arranged in a one-to-one correspondence, which helps to improve the stability of the upper mold assembly 1 when pressing down.

[0073] See also Figure 4 and Figure 7 , further explaining that a hollow guide sleeve 232 is provided in the first guide hole 231, and the guide column 123 is inserted into the guide sleeve 232, so that the guide column 123 and the first guide hole 231 can be closely matched to improve stability. At the same time, the setting of the guide sleeve 232 can also protect the first guide hole 231, preventing the first guide hole 231 from being impacted by the guide column 123 due to inaccurate positioning.

[0074] See also Figure 7 , further stating that the lower mold assembly 2 also includes a pad 24, which is arranged between the lower mold base 21 and the lower fixed plate 23, and the pad 24 is detachably connected to the lower mold base 21 and the lower fixed plate 23; a second guide hole 241 corresponding to the first guide hole 231 is opened on the pad 24, and when the upper mold assembly 1 is pressed downward, the guide column 123 can pass through the first guide hole 231 and enter the second guide hole 241.

[0075] See also Figure 2 and Figure 7 The lower mold assembly 2 also includes two guide plates 25, which are detachably connected to the upper surface of the lower fixed plate 23. The two guide plates 25 are respectively located on both sides of the support column 22, and the die core 34 is located between the two guide plates 25; the first guide hole 231 is arranged on the side of the guide plate 25 away from the support column 22.

[0076] By providing two guide plates 25, axial positioning can be achieved for the advancement of the pipe 4. Preferably, the upper end surface of the guide plates 25 is located at a height higher than the upper end surface of the die core 34. When the upper die assembly 1 is pressed downward, the lower end surface of the pressing plate 13 and the upper end surface of the guide plates 25 are pressed closely together. The guide plates 25 serve to offset the overload of the impact force of the upper die assembly 1 and limit the depth of the punch 121 entering the die core 34.

[0077] See also Figure 7 , it is further explained that the distance between the upper end surface of the guide plate 25 and the upper end surface of the die core 34 is the tube wall thickness of the tube fitting 4. When the tube fitting 4 is sleeved on the outside of the die core 34 and the inner flanging operation is performed, the pressing plate 13 is pressed down with the die so that the lower end surface of the pressing plate 13 can completely fit the upper end surface of the guide plate 25 and the upper end surface of the tube fitting 4, thereby pressing and flattening the upper end surface of the tube fitting 4; after the inner flanging operation is completed, the upper die assembly 1 moves upward, and the elastic member 14 rebounds to allow the punch 121 to be demolded from the tube fitting 4, and the pressing plate 13 remains in contact with the upper end surface of the guide plate 25 and the upper end surface of the tube fitting 4 during the demolding process until the punch 121 is completely separated from the tube fitting 4, thereby achieving the flattening operation of the upper end surface of the tube fitting 4 by the pressing plate 13.

[0078] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will be able to devise other specific implementations of the present invention without inventive effort, and such implementations will fall within the scope of protection of the present invention.

Claims

1. A bidirectional inner flanging device for pipe fittings, characterized by: It includes an upper mold assembly, a lower mold assembly and a core assembly, wherein the upper mold assembly is arranged above the lower mold assembly; The lower die assembly includes a lower die base and a supporting column, one end of the supporting column is fixedly connected to the lower die base, and the other end of the supporting column is protruded from the lower die base toward the direction of the upper die assembly; The mold core assembly includes a support member, a turn pin, a connecting member and a female mold core, one end of the support member is detachably connected to the lower mold base, and the other end of the support member is horizontally extended in a direction away from the lower mold base; the turn pin is fixedly connected to the end of the support member away from the lower mold base, and the axis of the turn pin is perpendicular to the plane where the front end surface of the support member is located; one end of the connecting member is rotatably connected to the turn pin, and the other end of the connecting member is fixedly connected to the female mold core; and the female mold core is located above the supporting column, and the upper end surface of the supporting column abuts against the bottom end surface of the female mold core to support the female mold core; The upper die assembly includes an upper die base and a hole-turning assembly, the hole-turning assembly is connected to the lower surface of the upper die base, the hole-turning assembly includes a punch protruding toward the die core, the punch matches the die core, and the position of the punch is set corresponding to the position of the support column.

2. The bidirectional inner flanging device for pipe fittings according to claim 1, characterized in that: The die core includes a connecting portion and a punching portion, one end of the connecting portion is fixedly connected to the end of the connecting member away from the rotating pin, and the other end of the connecting portion is fixedly connected to the punching portion, and the horizontal plane height of the upper end surface of the connecting portion is lower than the horizontal plane height of the upper end surface of the punching portion; A die hole is formed on the end surface of the hole-turning portion away from the supporting column. The position of the punch is corresponding to the position of the die hole, and the supporting column is located directly below the die hole.

3. The bidirectional inner flanging device for pipe fittings according to claim 1, characterized in that: The support member includes a support plate and a fixed block, one end of the support plate is detachably connected to the lower mold base, and the other end of the support plate is horizontally extended in a direction away from the lower mold base; the fixed block is fixedly connected to the end of the support plate away from the support column; A groove is provided on the upper end surface of the fixed block, one end of the turn pin is fixedly connected to the front side wall of the fixed block, and the other end of the turn pin extends into the groove and is fixedly connected to the rear side wall of the fixed block; the end of the connecting piece away from the die core is arranged in the groove and is rotatably connected to the turn pin.

4. The bidirectional inner flanging device for pipe fittings according to claim 3, characterized in that: The connecting member includes a rotating block and a connecting rod, one end of the rotating block is disposed in the groove and is rotatably connected to the rotating pin, the other end of the rotating block is fixedly connected to the connecting rod, and the end of the connecting rod away from the rotating block is fixedly connected to the die core; the front and rear walls of the rotating block are respectively in contact with the two inner side walls of the groove; The fixed block is further provided with a rotating inclined surface at one end away from the die core, one end of the rotating inclined surface is connected to the lower wall surface of the groove, and the other end of the rotating inclined surface is inclined downward in the direction away from the die core; the axis of the rotating pin is located directly above the position where the rotating inclined surface is connected to the lower wall surface of the groove.

5. The bidirectional inner flanging device for pipe fittings according to claim 3, characterized in that: The mold core assembly also includes a locating pin, one end of which is fixedly connected to the die core, and the other end of which protrudes upward toward the upper mold base, and the locating pin is located on the side of the die core away from the rotation pin.

6. The bidirectional inner flanging device for pipe fittings according to claim 5, characterized in that: The mold core assembly further includes a positioning block, which is detachably connected to the upper surface of the supporting plate and is located between the fixing block and the female mold core.

7. The bidirectional inner flanging device for pipe fittings according to claim 1, characterized in that: The upper mold assembly further includes a pressing plate and an elastic member, wherein the pressing plate is in floating connection with the upper mold base; one end of the elastic member is fixedly connected to the lower surface of the upper mold base, and the other end of the elastic member is fixedly connected to the upper surface of the pressing plate; The pressing plate is provided with a first avoidance through hole for the punch to pass through, an end of the punch away from the upper die seat is located in the first avoidance through hole, and the lower end surface of the punch is flush with the lower end surface of the pressing plate.

8. The bidirectional inner flanging device for pipe fittings according to claim 7, characterized in that: The punch assembly further includes an upper fixing plate connected to the lower surface of the upper die base, one end of the punch is fixedly connected to the upper fixing plate, and the other end of the punch is protruding toward the direction of the die core; The upper fixed plate is provided with a second avoidance through hole for the elastic member to pass through. One end of the elastic member away from the pressing plate passes through the second avoidance through hole and is fixedly connected to the upper mold base. There is a moving gap between the upper fixed plate and the pressing plate.

9. The bidirectional inner flanging device for pipe fittings according to claim 8, characterized in that: The punching assembly further includes a guide post, one end of which is fixedly connected to the upper fixing plate, and the other end of which passes through the pressing plate and protrudes toward the lower die base; The lower mold assembly also includes a lower fixed plate, which is fixedly connected to the upper surface of the lower mold base, one end of the support column is fixedly connected to the lower fixed plate, and the other end of the support column is protruded toward the direction of the die core; the lower fixed plate is provided with a first guide hole on the end surface facing the upper fixed plate, and the guide column is arranged corresponding to the first guide hole.

10. The bidirectional inner flanging device for pipe fittings according to claim 9, characterized in that: The lower mold assembly also includes two guide plates, which are detachably connected to the upper surface of the lower fixed plate. The two guide plates are respectively located on both sides of the support column, and the die core is located between the two guide plates; the first guide hole is arranged on the side of the guide plate away from the support column.

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