Adjustable double-end pipe expanding device

Abstract

The utility model discloses an adjustable double-end pipe expanding device which comprises a clamping mechanism used for clamping the middle of a pipe so that the position of the pipe can be fixed. The clamping mechanism is provided with a through groove matched with the pipe fitting, and the through groove is provided with ports for the pipe ends on the two sides of the pipe fitting to stretch out on the end faces on the two sides of the clamping mechanism respectively. Pipe expanding mechanisms are respectively arranged corresponding to the ports on the two sides, and are connected with sliding driving devices for driving the pipe expanding mechanisms to be relatively far away from or close to the corresponding ports; the pipe expanding mechanism is provided with a limiting structure attached to the end face of the pipe fitting. According to the utility model, the position of the pipe fitting and the depth of the female die can be adaptively adjusted according to the length requirement of the part needing pipe expanding.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle pipe fitting processing, in particular to an adjustable double-end pipe expanding device. Background Art

[0002] In the processing of the head tube of an electric bicycle, it is usually necessary to expand the tubes at both ends. Due to the different models of electric vehicles used, the required expansion lengths are different. The common double-end expansion device uses a fixed mold to batch stamp the tubes. If expansion stamping of different specifications is required, the corresponding fixture needs to be replaced to achieve it, which is not convenient to change the size at any time to perform expansion processing for different needs. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides an adjustable double-end pipe expansion device, which can adaptively adjust the pipe position and the depth of the die according to the required length requirement of the expanded pipe portion.

[0004] Technical solution: To achieve the above-mentioned purpose, the utility model provides an adjustable double-end pipe expanding device, including a clamping mechanism for clamping the middle part of the pipe fitting so that the position of the pipe fitting is fixed; the clamping mechanism is provided with a through groove adapted to the pipe fitting, and the through groove is provided with ports for the pipe ends on both sides of the pipe fitting to extend out on the end faces of the two sides of the clamping mechanism; pipe expanding mechanisms are respectively provided corresponding to the ports on both sides, and the pipe expanding mechanisms are connected to a sliding drive device that drives them to move relatively away from or close to the corresponding ports; the pipe expanding mechanism is provided with a limiting structure that fits with the end faces of the pipe fitting.

[0005] Furthermore, the limiting structure includes a push plate, which is arranged between the tube expansion punch and the clamping mechanism, and the push plate is connected to the avoidance adjustment drive device.

[0006] Furthermore, the clamping mechanism includes two clamping components aligned up and down, the clamping component located on the lower side is fixedly arranged, and the clamping component located on the upper side is lifted and arranged above the lower clamping component.

[0007] Furthermore, the clamping assembly includes an inner clamping body, the inner diameter of which is adapted to the outer diameter of the pipe fitting; the outer sliding sleeve of the inner clamping body is provided with an outer clamping body, the inner diameter of which is adapted to the outer diameter of the pipe fitting after expansion; the push plate is in close contact with the end faces of the outer clamping bodies of the two clamping assemblies.

[0008] Furthermore, the inner circular surface of the outer clamping body is provided with a protrusion, and the protrusions of the two clamping components are fitted to each other and are located between the clamping surfaces of the two clamping components.

[0009] Furthermore, the mating surfaces of the two protrusions are provided with staggered meshing axial limiting structures.

[0010] Beneficial effects: The utility model is an adjustable double-end pipe expanding device, which arranges the pipe expanding mechanism at the two ends of the clamping mechanism for relative sliding movement, so as to adjust the relative position of the pipe end relative to the end die of the clamping mechanism, so as to meet the processing requirements of the pipe fittings for different pipe end expansion lengths; at the same time, it adopts an adjustable inner and outer clamping body structure, which can make corresponding adjustments following the adjustment of the pipe fittings, so that the depth of the die at the port meets the requirement of the required pipe expansion length. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Attached Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0012] Attached Figure 2 The figure is a schematic diagram of the end surface structure of the clamping mechanism of an embodiment of the utility model. DETAILED DESCRIPTION

[0013] The utility model is further described below in conjunction with the accompanying drawings.

[0014] As attached Figure 1-2 The adjustable double-end pipe expanding device comprises a clamping mechanism 1, which is used to clamp the middle part of the pipe fitting 2 so that the position of the pipe fitting is fixed; the clamping mechanism 1 is provided with a through groove adapted to the pipe fitting 2, and the through groove is respectively provided with ports for the pipe ends of the pipe fitting 2 to extend out on both sides of the end faces of the clamping mechanism 1; corresponding to the ports on both sides, pipe expanding mechanisms 3 are respectively provided, and the pipe expanding mechanism 3 is connected to a sliding drive device that drives it to move relatively away from or close to the corresponding port; the pipe expanding mechanism 3 is provided with a limiting structure that fits with the end face of the pipe fitting 2.

[0015] Generally, a tube expansion fixture is provided with a concave die for tube expansion at the port position; by pushing the tube to slide relative to the through slot, the length of the part corresponding to the concave die at both ends of the tube is changed, thereby achieving tube expansion with different depth specifications at the end. In this scheme, the limiting structures of the tube expansion mechanisms on both sides are respectively fitted with the two ends of the clamped tube, and then the two sliding drive devices are coordinated to adjust the corresponding length of the concave die at the ends of the tube and the through slot. After the length is determined, the tube is clamped by the clamping mechanism, and the tube expansion mechanisms on both sides expand the tube synchronously or alternately.

[0016] Preferably, the sliding drive devices of the tube expansion mechanisms on both sides are symmetrically arranged on both sides of the clamping mechanism, so that when performing sliding adjustment, the adjustment spacing references on both sides are consistent, which is conducive to achieving precise offset adjustment.

[0017] The limiting structure includes a push plate 4, which is arranged between the expansion punch 31 and the clamping mechanism 1, and the push plate 4 is connected to the avoidance adjustment driving device. The push plate structure has a larger contact area with the pipe end and is more stable, wherein the avoidance adjustment driving device refers to a driving device that drives the push plate to move away from the expansion punch and the clamping mechanism in any manner, and preferably, the push plate can be driven by a cylinder to be raised and lowered.

[0018] The clamping mechanism 1 includes two clamping assemblies 5 aligned up and down, the clamping assembly 5 located at the lower side is fixedly arranged, and the clamping assembly 5 located at the upper side is lifted and arranged above the lower clamping assembly.

[0019] A semi-cylindrical groove is respectively arranged on the clamping surface of the upper and lower clamping assemblies, which forms the through groove in the clamping state. The lower clamping assembly is fixedly set, and the groove of the lower clamping assembly is used as a reference. The expansion punches of the expansion mechanisms on both sides are coaxially arranged with the reference groove and relatively close to or away from the groove end in the axial direction. Then, in the process of clamping the pipe fittings, it is only necessary to place the pipe fittings in the groove of the lower clamping assembly, and the push plates on both sides approach and fit the pipe ends, coordinate and cooperate to push the pipe fittings to slide into place along the groove, and the upper clamping assembly presses down to clamp the pipe fittings, and then the corresponding expansion operation is completed according to the expansion requirements.

[0020] Preferably, when loading pipes through automated equipment, the initial position of the pipe can be positioned so that it is at the center of the lower groove, and then the push plate on the side with the sliding deviation is moved into position first, and then the push plate on the other side pushes the pipe to the previous push plate, so as to avoid the impact force generated by the relative movement of the push plates on both sides acting on both ends of the pipe at the same time.

[0021] Since the length of the clamped part of the pipe is fixed, if the relative lengths between the two ends of the pipe and the port of the clamping mechanism meet the pipe expansion requirements after adjustment, the pipe expansion action can be performed simultaneously on both sides; if only one side meets the pipe expansion requirements, the pipe expansion action is performed on one end, and the offset length is readjusted after completion, and then the pipe expansion of the other end is performed. It should be noted that the pipe expansion of the deeper end must be performed first, and during the process, the push plate at the non-expanded end does not need to be removed, providing an external force opposite to the punching force to further ensure the stability of the pipe expansion.

[0022] The clamping assembly 5 comprises an inner clamping body 51, the inner diameter of which matches the outer diameter of the pipe 2; an outer sliding sleeve of the inner clamping body 51 is provided with an outer clamping body 52, the inner diameter of which matches the outer diameter of the pipe 2 after expansion; the push plate 4 is in close contact with the end faces of the outer clamping bodies 52 of the two clamping assemblies 5. Preferably, the sliding drive devices of the expansion mechanisms on both sides are symmetrically arranged on both sides of the inner clamping body 51.

[0023] The die at the end of the through groove of the clamping mechanism is mainly used to constrain the outer wall of the pipe fitting during the pipe expansion process, so as to ensure that the dimensional accuracy of the produced pipe fitting meets the pipe expansion requirements. Optimally, the depth of the die should be compatible with the length of the expanded part. Therefore, this scheme adopts an inner and outer clamping body structure with relative sliding adjustment. The end face of the inner clamping body and the inner circular surface of the outer clamping body constitute the end die structure. The adjustment of the die depth is achieved by adjusting the relative distance between the end faces of the outer clamping body and the inner clamping body. And by ensuring that the push plate area can fit with the end of the outer clamping body of the upper and lower clamping assemblies before clamping the pipe fitting, the outer clamping bodies of the upper and lower clamping assemblies can be adjusted synchronously while the pipe fitting is adjusted by the push plate.

[0024] The inner circular surface of the outer clamping body 52 is provided with a protrusion 6, and the protrusions 6 of the two clamping assemblies 5 fit each other and are located between the clamping surfaces of the two clamping assemblies 5. The purpose is to facilitate the two inner clamping bodies to clamp the upper and lower corresponding protrusions while the upper and lower clamping assemblies clamp the pipe fitting, so that the protrusions are clamped tightly, and then the two outer clamping bodies are clamped and fixed, avoiding relative displacement between the inner and outer clamping bodies during the pipe expansion process, and further ensuring the dimensional accuracy of the medium-pressure pipe expansion.

[0025] The mating surfaces of the two protrusions 6 are provided with staggered meshing axial limiting structures 61. The axial limiting structure refers to a structure that limits the relative sliding dislocation of the outer clamping body along its own axial direction. Preferably, the protrusions and recesses arranged alternately along the axial direction can be used, and the protrusions and recesses on the two outer clamping bodies correspond to each other up and down, which can ensure that the upper and lower outer clamping bodies will not have relative dislocation movement after clamping.

[0026] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An adjustable double-end pipe expansion device, characterized in that: The invention comprises a clamping mechanism (1) for clamping the middle part of a pipe fitting (2) so that the position of the pipe fitting is fixed; the clamping mechanism (1) is provided with a through groove adapted to the pipe fitting (2); the through groove is provided with ports for the pipe ends on both sides of the pipe fitting (2) to extend out on the end faces on both sides of the clamping mechanism (1); corresponding to the ports on both sides, a pipe expanding mechanism (3) is provided respectively; the pipe expanding mechanism (3) is connected to a sliding driving device that drives it to move away from or closer to the corresponding port; the pipe expanding mechanism (3) is provided with a limiting structure that fits with the end face of the pipe fitting (2).

2. The adjustable double-end pipe expansion device according to claim 1, characterized in that: The limiting structure comprises a push plate (4), the push plate (4) is arranged between the tube expansion punch (31) and the clamping mechanism (1), and the push plate (4) is connected to the avoidance adjustment drive device.

3. The adjustable double-end pipe expansion device according to claim 2, characterized in that: The clamping mechanism (1) comprises two clamping assemblies (5) aligned in an upper and lower manner, wherein the clamping assembly (5) located at the lower side is fixedly arranged, and the clamping assembly (5) located at the upper side is lifted and arranged above the lower clamping assembly.

4. The adjustable double-end pipe expansion device according to claim 3, characterized in that: The clamping assembly (5) comprises an inner clamping body (51), the inner diameter of which is adapted to the outer diameter of the pipe (2); an outer sliding sleeve of the inner clamping body (51) is provided with an outer clamping body (52), the inner diameter of which is adapted to the outer diameter of the pipe (2) after expansion; and the push plate (4) is in close contact with the end faces of the outer clamping bodies (52) of the two clamping assemblies (5).

5. The adjustable double-end pipe expansion device according to claim 4, characterized in that: The inner circular surface of the outer clamping body (52) is provided with a protrusion (6), and the protrusions (6) of the two clamping components (5) are fitted to each other and are located between the clamping surfaces of the two clamping components (5).

6. The adjustable double-end pipe expansion device according to claim 5, characterized in that: The mating surfaces of the two protrusions (6) are provided with staggered meshing axial limiting structures (61).

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