A special-shaped pipe necking machine

Abstract

A special-shaped pipe necking machine tool belongs to the technical field of pipe fitting necking equipment. By setting the necking die to a structure in which multiple pressing plates neck the pipe, the necking die squeezes and necks the pipe through the rotatable pressing plates, directly applying radial pressure on the surface of the pipe by the pressing plates, eliminating the axial pressure on the die, thereby reducing the pressure of the press and the operating cost. By connecting leaf springs to the pressing plates, after the pressing plates are squeezed by the necking oil cylinder, they will reset through the elastic force of the leaf springs and lift off the surface of the pipe fitting, thus facilitating the removal of the pipe fitting from the necking die and avoiding cracking of the pipe fitting during the demolding process.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipe fitting necking equipment, and specifically relates to a special-shaped pipe necking machine tool. Background Art

[0002] Currently, for the die used to perform necking processing on metal pipes, an axially applied necking die is generally adopted. The lower die of the axially applied necking die is provided with a cavity vertically arranged corresponding to the outer shape and size of the necking outer contour. The pipe to be processed is sleeved on the mandrel and placed in the cavity of the lower die. The upper die moves downward under the drive of a pressure device, pushing the mandrel to extrude the pipe to be processed. The pipe to be processed deforms under the action of axial pressure to form a necking.

[0003] During the processing with the axially applied necking die, since the diameter of the metal pipe changes after being extruded, the situation of difficult demolding usually occurs, resulting in cracking of the pipe after demolding. Moreover, because the traditional axially applied necking die applies pressure to the pipe fitting radially by moving axially, a relatively large pressure is required. Therefore, a relatively large press needs to be equipped, which increases the operation cost of the equipment. Summary of the Invention

[0004] The present invention mainly solves the technical problems existing in the above-mentioned prior art, and provides a special-shaped pipe necking machine tool.

[0005] The above-mentioned technical problem of the present invention is mainly solved by the following technical scheme: a special-shaped pipe shrinking machine tool comprises a base plate, the upper surface of the base plate is provided with a shrinking mechanism, a positioning mechanism and two groups of supporting mechanisms, the shrinking mechanism and the positioning mechanism are symmetrically arranged on the upper surface of the base plate, the shrinking mechanism and the positioning mechanism each include two groups of slide rail groups, the slide rail groups are provided with sliders, and the sliders are provided with hydraulic clamping blocks for locking, a rectangular frame plate is connected between the two groups of slide rail groups in the shrinking mechanism and the positioning mechanism, a T-shaped frame plate is also provided between the two groups of slide rail groups in the positioning mechanism, the T-shaped frame plate is arranged on the left side of the rectangular frame plate on the same side, a cylinder mounting frame is provided on the two rectangular frame plates, a telescopic cylinder is provided on the cylinder mounting frame, an axle seat is provided on the right end of the T-shaped frame plate, a connecting tube is connected between the axle seat and the cylinder mounting frame on the same side, and a sliding block in the axle seat The movable connection is provided with a positioning pin shaft, the right end of the positioning pin shaft is connected with the protruding end in the corresponding telescopic oil cylinder, the telescopic oil cylinder in the shrinking mechanism is connected with the shrinking mold, the shrinking mold and the positioning pin shaft are in the same straight line, and two groups of supporting mechanisms are arranged symmetrically front and back, and each group of the supporting mechanisms comprises a mounting bracket and two supporting brackets, and a positioning cylinder and a clamping cylinder are arranged on the sides close to the two supporting brackets, and the positioning cylinder is arranged on the upper side of the clamping cylinder, and the two supporting brackets are arranged left and right, the supporting bracket on the left is arranged on the bottom plate, and the supporting bracket on the right is arranged on the T-shaped frame plate of the positioning mechanism, the mounting bracket is arranged on the bottom plate between the two supporting brackets, an electric slide rail is arranged on the mounting bracket, and the electric slide rail is arranged longitudinally, and a lifting cylinder is arranged on the slide plate in the electric slide rail, and the protruding ends of the positioning cylinder, the clamping cylinder and the lifting cylinder are all provided with clamping blocks for clamping pipes;

[0006] The shrinking mold includes a base connected to a corresponding telescopic cylinder, a core rod is provided at the center position of the base, a mounting sleeve is provided on the outer sleeve of the core rod, a plurality of pressure plates are provided in a circular array on the end surface of the base between the core rod and the mounting sleeve, one end of the pressure plate close to the base is hingedly connected to the end surface of the base, a slot hole is provided at one end of the mounting sleeve close to the base and corresponding to the plurality of pressure plates, a leaf spring is connected between the slot hole and the pressure plate, a shrinking cylinder is provided at one end of the mounting sleeve away from the base and corresponding to the plurality of pressure plates, and the protruding end of the shrinking cylinder extends to the inside of the mounting sleeve and is pressed on the pressure plate.

[0007] Preferably, the cross-sectional shape of the core rod is polygonal.

[0008] Preferably, the cross-sectional shape of the core rod is one of a quadrilateral, a pentagon and a hexagon.

[0009] Preferably, the shape of the mounting sleeve is the same as that of the core rod.

[0010] Preferably, the length of the clamping block on the lifting cylinder is longer than that of the clamping blocks on the positioning cylinder and the material clamping cylinder.

[0011] Preferably, a rotary handwheel for adjusting the position of the T-shaped frame plate is provided on the lower surface of the T-shaped frame plate.

[0012] The beneficial effects of the present invention are as follows: By setting the necking die to a structure in which a plurality of pressing plates neck the pipe, the necking die squeezes and necks the pipe through the rotatable pressing plates, and directly applies radial pressure on the surface of the pipe by the pressing plates, eliminating the axial pressure of the die, thereby reducing the pressure of the press and reducing the operating cost.

[0013] By connecting a leaf spring to the pressing plate, after the pressing plate is extruded by the necking oil cylinder, it will reset by the elastic force of the leaf spring and lift off the surface of the pipe fitting, thus facilitating the removal of the pipe fitting from the necking die and avoiding cracking of the pipe fitting during the demolding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present invention;

[0015] Figure 2 is a schematic internal structural diagram of the necking die of the present invention;

[0016] Figure 3 is Figure 2 an enlarged schematic diagram of part A in

[0017] Figure 4 is a schematic diagram of the use state of the present invention.

[0018] In the figure: 1, bottom plate; 2, slide rail group; 3, slider; 4, hydraulic clamping block; 5, rectangular frame plate; 6, T-shaped frame plate; 7, oil cylinder mounting frame; 8, telescopic oil cylinder; 9, shaft seat; 10, positioning pin shaft; 11, mounting bracket; 12, supporting frame; 13, positioning cylinder; 14, material clamping cylinder; 15, electric slide rail; 16, lifting cylinder; 17, clamping block; 18, base; 19, mandrel; 20, mounting sleeve; 21, pressing plate; 22, slot hole; 23, leaf spring; 24, necking oil cylinder; 25, connecting cylinder; 26, rotary handwheel; 27, necking die. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical solutions of the present invention will be further specifically described below through embodiments in conjunction with the drawings.

[0020] Embodiment: A special-shaped pipe necking machine tool, as Figures 1-4As shown, it includes a base plate 1, the upper surface of which is provided with a shrinking mechanism, a positioning mechanism and two groups of supporting mechanisms, the shrinking mechanism and the positioning mechanism are symmetrically arranged on the upper surface of the base plate 1, the shrinking mechanism and the positioning mechanism each include two groups of slide rail groups 2, the slide rail groups 2 are each provided with a slider 3, the slider 3 is provided with a hydraulic clamping block 4 for locking, a rectangular frame plate 5 is connected between the two groups of slide rail groups 2 in the shrinking mechanism and the positioning mechanism, a T-shaped frame plate 6 is also provided between the two groups of slide rail groups 2 in the positioning mechanism, the T-shaped frame plate 6 is provided on the left side of the rectangular frame plate 5 on the same side, a cylinder mounting frame 7 is provided on the two rectangular frame plates 5, a telescopic cylinder 8 is provided on the cylinder mounting frame 7, an axle seat 9 is provided on the right end of the T-shaped frame plate 6, a connecting tube 25 is connected between the axle seat 9 and the cylinder mounting frame 7 on the same side, a positioning pin 10 is slidably connected in the axle seat 9, and the right end of the positioning pin 10 is connected to the corresponding telescopic cylinder 8 The extending end of the shrinking mechanism is connected, the shrinking mold 27 is connected to the telescopic oil cylinder 8, and the shrinking mold 27 is in the same straight line with the positioning pin shaft 10. The two groups of supporting mechanisms are symmetrically arranged front and back, and each group of the supporting mechanisms includes a mounting bracket 11 and two supporting frames 12. A positioning cylinder 13 and a clamping cylinder 14 are arranged on the sides close to the two supporting frames 12. The positioning cylinder 13 is arranged on the upper side of the clamping cylinder 14. The two supporting frames 12 are arranged left and right. The supporting frame 12 on the left is arranged on the bottom plate 1, and the supporting frame 12 on the right is arranged on the T-shaped frame plate 6 of the positioning mechanism. The mounting bracket 11 is arranged on the bottom plate 1 between the two supporting frames 12. An electric slide rail 15 is arranged on the mounting bracket 11, and the electric slide rail 15 is arranged longitudinally. A lifting cylinder 16 is arranged on the slide plate in the electric slide rail 15. The protruding ends of the positioning cylinder 13, the clamping cylinder 14 and the lifting cylinder 16 are all provided with clamping blocks 17 for clamping pipes.

[0021] The shrinking mold 27 includes a base 18 connected to the corresponding telescopic cylinder 8, a core rod 19 is provided at the center position of the base 18, a mounting sleeve 20 is provided on the outer cover of the core rod 19, and a plurality of pressing plates 21 are provided in a circular array on the end surface of the base 18 between the core rod 19 and the mounting sleeve 20, and the end of the pressing plate 21 close to the base 18 is hingedly connected to the end surface of the base 18, a slot hole 22 is provided at one end of the mounting sleeve 20 close to the base 18 and corresponding to the plurality of pressing plates 21, a leaf spring 23 is connected between the slot hole 22 and the pressing plate 21, a shrinking cylinder 24 is provided at one end of the mounting sleeve 20 away from the base 18 and corresponding to the plurality of pressing plates 21, and the protruding end of the shrinking cylinder 24 extends to the inside of the mounting sleeve 20 and presses on the pressing plate 21.

[0022] The cross-sectional shape of the mandrel 19 is polygonal; the cross-sectional shape of the mandrel 19 is one of a quadrilateral, a pentagon, and a hexagon; the outer shape of the mounting sleeve 20 is the same as the shape of the mandrel 19; the length of the clamping block 17 on the lifting cylinder 16 is longer than that of the clamping block 17 in the positioning cylinder 13 and the material clamping cylinder 14; a rotary handwheel 26 for adjusting the position of the T-shaped frame plate 6 is provided on the lower surface of the T-shaped frame plate 6.

[0023] Principle of the present invention: Before the equipment runs, first control the positioning cylinder 13 in the two groups of supporting mechanisms to extend and clamp a pipe to be processed. Then, place the pipe to be processed between the supporting frames 12. During processing, first control the electric slide rail 15 to move upward, and use the two lifting cylinders 16 to clamp the lowermost pipe. After clamping, the positioning cylinder 13 is released, the electric slide rail 15 moves downward by the distance of one pipe, the positioning cylinder 13 clamps the pipe again, and the electric slide rail 15 continues to move downward to move the pipe to the height of the clamping plate in the material clamping cylinder 14. Control the clamping cylinders in the two groups of supporting mechanisms to clamp the downward-moving pipe fitting. After the pipe fitting is clamped, control the telescopic oil cylinder 8 in the positioning mechanism to extend to limit the right end of the pipe fitting. At the same time, the telescopic oil cylinder 8 of the necking mechanism also extends, and the necking die 27 is sleeved on the left end of the pipe fitting. Use the necking die 27 to neck the pipe fitting. Simultaneously press multiple pressure plates 21 through multiple necking oil cylinders 24. The pressure plates 21 directly apply radial pressure on the surface of the pipe to form a necking. After the pressure plates 21 are extruded by the necking oil cylinders 24, they will reset by the elastic force of the leaf springs 23 and lift off the surface of the pipe fitting, so as to facilitate the pipe fitting to be removed from the necking die 27 and avoid cracking of the pipe fitting during the demoulding process.

[0024] Before the processing, the position of the T-shaped frame plate 6 can be adjusted by rotating the rotary handwheel 26 to facilitate necking of pipe fittings with different lengths. During processing, multiple hydraulic clamping blocks 4 are all in a clamped state to prevent the rectangular frame plate 5 and the T-shaped frame plate 6 from moving.

[0025] Finally, it should be pointed out that the above embodiments are only relatively representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and there can be many variations. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. A special-shaped pipe necking machine tool, comprising a bottom plate (1), characterized in that: The upper surface of the bottom plate (1) is provided with a shrinking mechanism, a positioning mechanism and two groups of supporting mechanisms. The shrinking mechanism and the positioning mechanism are symmetrically arranged on the upper surface of the bottom plate (1). The shrinking mechanism and the positioning mechanism both include two groups of slide rail groups (2). The slide rail groups (2) are each provided with a slider (3). The slider (3) is provided with a hydraulic clamping block (4) for locking. A rectangular frame plate (5) is connected between the two groups of slide rail groups (2) in the shrinking mechanism and the positioning mechanism. A T-shaped frame plate (6) is also provided between the two groups of slide rail groups (2) in the positioning mechanism. ), the T-shaped frame plate (6) is arranged on the left side of the rectangular frame plate (5) on the same side, and a cylinder mounting frame (7) is provided on each of the two rectangular frame plates (5), and a telescopic cylinder (8) is provided on the cylinder mounting frame (7), and an axle seat (9) is provided at the right end of the T-shaped frame plate (6), and a connecting tube (25) is connected between the axle seat (9) and the cylinder mounting frame (7) on the same side, and a positioning pin shaft (10) is slidably connected in the axle seat (9), and the right end of the positioning pin shaft (10) is connected to the protruding end of the corresponding telescopic cylinder (8). The telescopic oil cylinder (8) in the shrinking mechanism is connected to the shrinking mold (27), and the shrinking mold (27) and the positioning pin shaft (10) are on the same straight line. The two groups of supporting mechanisms are symmetrically arranged front and back, and each group of the supporting mechanisms includes a mounting bracket (11) and two supporting frames (12). A positioning cylinder (13) and a clamping cylinder (14) are arranged on the side close to the two supporting frames (12). The positioning cylinder (13) is arranged on the upper side of the clamping cylinder (14). The two supporting frames (12) are arranged on the left and right, and the left supporting frame (12) is arranged on the left and right sides. The support frame (12) is arranged on the bottom plate (1), the right support frame (12) is arranged on the T-shaped frame plate (6) of the positioning mechanism, the mounting bracket (11) is arranged on the bottom plate (1) between the two support frames (12), an electric slide rail (15) is arranged on the mounting bracket (11), the electric slide rail (15) is arranged longitudinally, a lifting cylinder (16) is arranged on the slide plate in the electric slide rail (15), and the protruding ends of the positioning cylinder (13), the clamping cylinder (14) and the lifting cylinder (16) are all provided with clamping blocks (17) for clamping pipes; The necking die (27) includes a base (18) connected to a corresponding telescopic oil cylinder (8). A mandrel (19) is provided at the center of the base (18). An installation sleeve (20) is sleeved outside the mandrel (19). On the end face of the base (18) between the mandrel (19) and the installation sleeve (20), a plurality of pressing plates (21) are annularly arrayed. One end of the pressing plate (21) close to the base (18) is hingedly connected to the end face of the base (18). At the position corresponding to the plurality of pressing plates (21) at one end of the installation sleeve (20) close to the base (18), a slot hole (22) is provided. A leaf spring (23) is connected between the slot hole (22) and the pressing plate (21). At the position corresponding to the plurality of pressing plates (21) at one end of the installation sleeve (20) away from the base (18), a necking oil cylinder (24) is provided. The extending end of the necking oil cylinder (24) extends into the installation sleeve (20) and presses on the pressing plate (21).

2. The special-shaped pipe necking machine according to claim 1, characterized in that: The cross-sectional shape of the mandrel (19) is polygonal.

3. The special-shaped pipe necking machine according to claim 1, characterized in that: The cross-sectional shape of the mandrel (19) is one of a quadrilateral, a pentagon, and a hexagon.

4. An abnormal-shaped pipe necking machine according to claim 1, characterized in that: The outer shape of the installation sleeve (20) is the same as the shape of the mandrel (19).

5. The special-shaped pipe necking machine according to claim 1, characterized in that: The length of the clamping block (17) on the lifting air cylinder (16) is longer than that of the clamping block (17) on the positioning air cylinder (13) and the material clamping air cylinder (14).

6. The special-shaped pipe necking machine according to claim 1, characterized in that: A rotary handwheel (26) for adjusting the position of the T-shaped frame plate (6) is provided on the lower surface of the T-shaped frame plate (6).

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