CN217142034U

CN217142034U - Electric pipe expander

Info

Publication number: CN217142034U
Application number: CN202220863810.XU
Authority: CN
Inventors: 王德胜; 王横; 王纵
Original assignee: Jinhua Weike Industrial & Trading Co ltd
Current assignee: Jinhua Weike Industrial & Trading Co ltd
Priority date: 2022-04-14
Filing date: 2022-04-14
Publication date: 2022-08-09
Anticipated expiration: 2032-04-14

Abstract

The utility model discloses an electric tube expander, which comprises a tube expander main body, wherein a propulsion cavity is arranged in the tube expander main body, a propulsion shaft is movably arranged in the propulsion cavity, the propulsion shaft is propelled and retreated along the self shaft under the action of a driving mechanism, the propulsion shaft is provided with a first end and a second end which are opposite along the axial direction, the first end is arranged towards a chuck of the tube expander and is provided with a tube expanding conical head, the second end is provided with a screw rod along the axial direction, and the end part of the screw rod is provided with a force application part; the propelling shaft is internally provided with a containing cavity with an opening positioned at the second end of the propelling shaft, the force application part extends into the containing cavity, a disc spring group is clamped between the force application end face of the force application part and the bottom wall of the containing cavity, and the disc spring group is compressed along the axial direction under the extrusion of the force application end face. The utility model discloses a set up dish spring group, can provide reliable stable axial propulsion resistance for the screw rod impels to improve the expander quality.

Description

Electric pipe expander

Technical Field

The utility model belongs to the technical field of the expander, concretely relates to electronic expander.

Background

In the installation process of the air conditioner, a pipe expander is required to perform pipe expanding treatment on the pipe fitting, in order to improve the pipe expanding efficiency, an electric pipe expander is mostly adopted for pipe expanding, a worm wheel is mostly utilized to drive a pipe expanding cone to rotate in the pipe expanding process to complete pipe expanding, but the rotating speed of the worm wheel is higher, the axial moving speed of the pipe expanding cone is higher, the single-circumference axial feeding deformation of the pipe expanding cone is larger, the circumferential shape of a bell mouth of the pipe fitting after pipe expanding is not uniform enough, and the pipe expanding quality is influenced.

Disclosure of Invention

The utility model discloses to the unable problem of guaranteeing of electronic expander pipe quality among the prior art, provide an electronic expander.

The invention aims to be realized by the following technical scheme:

an electric pipe expander comprises a pipe expander body, wherein a pushing cavity is formed in the pipe expander body, a pushing shaft is movably arranged in the pushing cavity, the pushing shaft is pushed and retreated along the self shaft of the pushing shaft under the action of a driving mechanism, the pushing shaft is provided with a first end and a second end which are opposite along the axial direction, the first end of the pushing shaft is arranged towards a chuck of the pipe expander and provided with a pipe expanding conical head, the second end of the pushing shaft is provided with a screw rod along the axial direction, and the end part of the screw rod is provided with a force application part; the propelling shaft is internally provided with an accommodating cavity with an opening positioned at the second end of the propelling shaft, the force application part extends into the accommodating cavity, a disc spring group is clamped between the force application end surface of the force application part and the bottom wall of the accommodating cavity, and the disc spring group is compressed along the axial direction under the extrusion of the force application end surface.

Preferably, a disc spring limiting pad is arranged in the accommodating cavity and comprises a gasket and a positioning column vertically arranged in the center of the gasket, the gasket abuts against the bottom wall of the accommodating cavity, and the disc spring group is arranged on the positioning column in a penetrating mode.

Preferably, the disc spring group is formed by alternately combining a single disc spring and a single disc spring in the forward and reverse directions, or formed by alternately combining a double-disc superposed disc spring and a double-disc superposed disc spring in the forward and reverse directions, or formed by alternately combining a single disc spring and a double-disc superposed disc spring in the forward and reverse directions.

Preferably, the force application part of the screw is a boss integrally formed at the end of the screw, the boss is coaxial with the screw, the force application end face is a boss outer end face, and a yielding groove for yielding a pair of positioning columns is formed in the center of the boss outer end face.

Preferably, the driving mechanism comprises a worm wheel and a worm which are meshed with each other, the propelling cavity is formed in a worm wheel seat of the worm wheel, and the propelling shaft is connected with the worm wheel key through a flat key capable of axially sliding.

Preferably, a key groove extending along the axial direction is formed in the inner wall of the worm wheel seat, a strip-shaped groove is formed in the side wall of the boss, the strip-shaped groove extends along the axial direction of the screw rod, a notch is formed in the outer end face of the boss, one end of the flat key extends into the key groove, and the other end of the flat key extends into the accommodating cavity of the pushing shaft and extends into the strip-shaped groove of the boss.

Preferably, a worm gear box is arranged outside the worm gear, and a nut member matched with the screw rod is arranged at the end part of the worm gear box.

Preferably, a steel sleeve is tightly matched on the outer wall of the propulsion shaft, and the length of the steel sleeve is consistent with that of the propulsion shaft; the expander body is embedded with a base bearing, and the steel sleeve and the pushing shaft penetrate through a center hole of the worm wheel and extend into a center hole of the base bearing.

Preferably, the steel sleeve is provided with a yielding hole for yielding the flat key, the flat key penetrates through the yielding hole and the outer wall of the propulsion shaft to enter the accommodating cavity, the aperture of the yielding hole is larger than the outer diameter of the flat key, and the flat key is not in contact with the steel sleeve.

Preferably, the first end of the propulsion shaft is provided with an assembly hole for assembling the pipe expanding conical head, an included angle is formed between the axis of the assembly hole and the axis of the propulsion shaft, and the pipe expanding conical head is rotatably assembled in the assembly hole through a conical head bearing.

Compared with the prior art, the utility model discloses following beneficial effect has: the utility model provides reliable axial propulsion resistance for screw propulsion by arranging the disc spring group, thereby reducing the axial moving speed of the pipe expanding cone head during pipe expanding, reducing the axial feeding deformation of the pipe expanding cone body in one circle, improving the circumferential uniformity of a pipe fitting bell mouth and improving the pipe expanding quality; the utility model adopts the disc spring group to provide axial propulsion resistance, compared with other elastic parts, the disc spring group can be flexibly combined according to requirements, and has the advantages of large load, short stroke, small required assembly space, long service life and convenient maintenance and replacement; the force application part of the screw is reasonable in structure arrangement, and the limiting shaft of the disc spring limiting pad can be accurately abducted by arranging the abduction groove, so that the force application end can stably apply force to the disc spring group; the outer wall of the propulsion shaft is tightly matched with a steel sleeve, and the steel sleeve wraps the whole length direction of the propulsion shaft and moves synchronously along with the propulsion shaft, so that effective support and protection are provided for the propulsion shaft, the propulsion stability of the propulsion shaft is ensured, the propulsion shaft is prevented from being worn, and the service life of the propulsion shaft is prolonged.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention;

FIG. 3 is a schematic structural view of a driving mechanism of the present invention;

FIG. 4 is a schematic view of the structure of the middle screw rod of the present invention;

the labels in the figure are: an expander body 10; a worm wheel 11; a worm 12; a worm gear seat 13; a worm gear case 14; a key groove 131; a flat key 15; a chuck 20; a handle 30; a propeller shaft 40; a disc spring group 42; a spacer 43; a positioning post 44; a pipe expanding cone 51; a cone head bearing 52; a screw 60; a boss 61; a relief groove 611; a strip groove 612; a nut member 70; a steel jacket 80; a relief hole 81; a housing bearing 90.

Detailed Description

The invention will be further described with reference to the embodiments shown in the drawings to which:

example 1

As shown in fig. 1-4, the embodiment discloses an electric tube expander, which includes a tube expander body 10, a pushing cavity is provided in the tube expander body 10, a tube expanding cavity is further provided at the front end of the pushing cavity, the pushing cavity is communicated with the tube expanding cavity, and a chuck 20 for holding a tube to be processed is clamped in the tube expanding cavity; a handle 30 is provided at the rear end of the expander body 10.

A propelling shaft 40 is coaxially arranged in the propelling cavity, and the propelling shaft 40 can be screwed in and retracted along the self axial direction under the action of a driving mechanism, in the embodiment, the driving mechanism comprises a worm wheel 11 and a worm 12 which are meshed with each other, the worm 12 is driven by a motor, and the motor is powered by a lithium battery; the propulsion chamber is arranged in a worm wheel seat 13 of the worm wheel 11, and the propulsion shaft 40 is connected with the worm wheel 11 through a flat key 15 capable of axially sliding.

The propulsion shaft 40 is provided with a first end and a second end which are opposite to each other along the axial direction, the first end of the propulsion shaft is arranged towards the workpiece chuck 20 of the pipe expander and is provided with an assembling hole for assembling the pipe expanding conical head 51, an included angle is formed between the axis of the assembling hole and the axis of the propulsion shaft 40, and the pipe expanding conical head 51 is rotatably assembled in the assembling hole through the conical head bearing 52. The pipe expanding conical head 51 is obliquely arranged on the outer end face of the propelling shaft 40 to realize spinning pipe expanding processing, the pipe expanding conical head 51 is rotatably connected with the propelling shaft 40 through the conical head bearing 52, and the pipe expanding conical head 51 can freely rotate along the axis of the pipe expanding conical head in the pipe expanding process, so that rolling friction is kept between the pipe expanding conical head and a pipe to be processed, the friction force is reduced, the pipe expanding conical head 51 is more uniformly worn, and the pipe expanding quality is further ensured.

The second end of the propulsion shaft 40 is provided with a screw rod 60 along the axial direction, the end of the screw rod 60 is provided with a force application part, the propulsion shaft 40 is internally provided with an accommodating cavity with an opening positioned at the second end, the force application part of the screw rod 60 extends into the accommodating cavity, a disc spring group 42 is clamped between the force application end surface of the force application part and the bottom wall of the accommodating cavity, and the disc spring group 42 is compressed along the axial direction during pipe expansion to provide axial propulsion resistance for the screw rod 60.

A disc spring limiting pad is arranged in the accommodating cavity and comprises a gasket 43 and a positioning column 44 vertically arranged in the center of the gasket 43, the gasket 43 abuts against the bottom wall of the accommodating cavity, and the disc spring group 42 is arranged on the positioning column 44 in a penetrating mode; the disc spring is formed by combining a plurality of disc spring groups 42, the combination number and combination form of the disc spring groups can be set according to requirements to obtain different bearing capacities and characteristic curves, and in the embodiment, the disc spring groups 42 are formed by alternately combining single disc springs and single disc springs in the forward and reverse directions.

The force application part of the screw rod 60 is a boss 61 integrally formed at the end part of the screw rod 60, the boss 61 is coaxial with the screw rod 60, the force application end face is the outer end face of the boss 61, and the center of the outer end face of the boss 61 is provided with a yielding groove 611 for yielding the disc spring positioning column 44.

The inner wall of the worm wheel seat 13 is provided with a key groove 131 extending along the axial direction, the side wall of the boss 61 is provided with a strip-shaped groove 612, the strip-shaped groove 612 extends along the axial direction of the screw rod 60 and forms a notch on the outer end face of the boss 61, one end of the flat key 15 extends into the key groove 131, and the other end of the flat key extends into the accommodating cavity of the pushing shaft 40 and extends into the strip-shaped groove 612 of the boss 61. In this embodiment, two flat keys 15 are arranged along the radial direction of the propulsion shaft 40 and symmetrically arranged on two sides of the propulsion shaft 40 to ensure that the propulsion shaft 40 is uniformly stressed and stably runs. Two keyways 131 and two grooves 612 are also provided.

The worm wheel 11 is externally provided with a worm gear case 14, and the end of the worm gear case 14 is provided with a nut member 70 engaged with the screw 60. During pipe expanding, the worm 12 drives the worm wheel 11 to rotate, the worm wheel 11 drives the propelling shaft 40 and the screw rod 60 to rotate through the flat key 15, the screw rod 60 pushes the propelling shaft 40 to advance, after an expanding cone is abutted to a pipe to be processed for pipe expanding, the advancing of the propelling shaft 40 is blocked, the screw rod 60 continues to advance and compresses the disc spring group 42, and the disc spring group 42 provides axial propelling resistance for the screw rod 60 after being compressed, so that the propelling speed is reduced, the single-circumference axial feeding deformation of the expanding cone is reduced, the circumferential uniformity of a pipe bell mouth is improved, and the pipe expanding quality is improved.

A steel sleeve 80 is tightly matched on the outer wall of the propulsion shaft 40, the length of the steel sleeve 80 is consistent with that of the propulsion shaft 40, a base bearing 90 is embedded in the pipe expander main body 10, the steel sleeve 80 and the propulsion shaft 40 penetrate through the central hole of the worm gear 11 and extend into the central hole of the base bearing 90, the steel sleeve 80 wraps the whole length direction of the propulsion shaft 40 and moves synchronously along with the propulsion shaft 40, effective support and protection are provided for the propulsion shaft 40, the propulsion stability of the propulsion shaft 40 is guaranteed, abrasion of the propulsion shaft is avoided, and the service life of the propulsion shaft 40 is prolonged. The steel sleeve 80 is provided with a yielding hole 81 for yielding the flat key 15, the flat key 15 penetrates through the yielding hole 81 and the outer wall of the propulsion shaft 40 to enter the accommodating cavity, the aperture of the yielding hole 81 is larger than the outer diameter of the flat key 15, and the flat key 15 is not in contact with the steel sleeve 80.

The utility model discloses compact structure, the operation is stable, and through propulsion shaft 40, dish spring group 42 and the cooperation of screw rod 60 three, the expander quality has effectively been improved.

It is to be understood that in the claims, the specification of the present invention, all "including … …" are to be interpreted in an open-ended manner, i.e. in a manner equivalent to "including at least … …", and not in a closed manner, i.e. in a manner not to be interpreted as "including only … …". The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

The above description is only the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and those skilled in the art should be able to make changes, modifications, additions or substitutions within the scope of the present invention.

Claims

1. An electric pipe expander comprises a pipe expander body and is characterized in that a pushing cavity is formed in the pipe expander body, a pushing shaft is arranged in the pushing cavity, the pushing shaft is pushed and retreated along the self axial direction under the action of a driving mechanism, the pushing shaft is provided with a first end and a second end which are opposite along the axial direction, the first end of the pushing shaft is arranged towards a chuck of the pipe expander and provided with a pipe expanding conical head, the second end of the pushing shaft is provided with a screw rod along the axial direction, and the end part of the screw rod is provided with a force application part; the propelling shaft is internally provided with an accommodating cavity with an opening positioned at the second end of the propelling shaft, the force application part extends into the accommodating cavity, a disc spring group is clamped between the force application end surface of the force application part and the bottom wall of the accommodating cavity, and the disc spring group is compressed along the axial direction under the extrusion of the force application end surface.

2. The electric expander according to claim 1, wherein a disc spring limiting pad is disposed in the accommodating cavity, the disc spring limiting pad includes a spacer and a positioning post vertically disposed at a center of the spacer, the spacer abuts against a bottom wall of the accommodating cavity, and the disc spring set is disposed on the positioning post.

3. An electric expander as claimed in claim 2, wherein the force applying portion of the screw is a boss integrally formed at an end of the screw, the boss is coaxial with the screw, the force applying end face is an outer end face of the boss, and a yielding groove for yielding a pair of positioning posts is formed in the center of the outer end face of the boss.

4. An electric expander as claimed in claim 3, wherein said drive means comprises a worm wheel and a worm in engagement with each other, said propulsion chamber being provided in a worm wheel housing of the worm wheel, the propulsion shaft being keyed to the worm wheel by means of an axially slidable flat key.

5. An electric expander as claimed in claim 4, wherein the inner wall of the worm gear seat is provided with a key groove extending along the axial direction, the side wall of the boss is provided with a strip-shaped groove extending along the axial direction of the screw, and a notch is formed on the outer end surface of the boss, one end of the flat key extends into the key groove, and the other end of the flat key extends into the accommodating cavity of the pushing shaft and extends into the strip-shaped groove of the boss.

6. An electric expander as claimed in claim 5, wherein the worm gear is externally provided with a worm gear case, and the end of the worm gear case is provided with a nut member for engaging with the screw.

7. An electric expander as claimed in claim 1, wherein said disc spring assembly is formed by alternately combining single disc springs and single disc springs in forward and reverse directions, or by alternately combining double disc springs and double disc springs in forward and reverse directions, or by alternately combining single disc springs and double disc springs in forward and reverse directions.

8. An electric expander as claimed in any one of claims 4 to 6, wherein a steel sleeve is tightly fitted on the outer wall of said propeller shaft, and the length of said steel sleeve is identical to the length of said propeller shaft; the expander body is embedded with a base bearing, and the steel sleeve and the pushing shaft penetrate through a center hole of the worm wheel and extend into a center hole of the base bearing.

9. The electric pipe expander according to claim 8, wherein the steel sleeve is provided with a abdicating hole for abdicating the flat key, the flat key passes through the abdicating hole and the outer wall of the propulsion shaft and enters the accommodating cavity, the aperture of the abdicating hole is larger than the outer diameter of the flat key, and the flat key is not in contact with the steel sleeve.

10. An electric expander as claimed in claim 1, wherein the first end of the propulsion shaft defines a mounting hole for mounting the expander cone, and the axis of the mounting hole forms an angle with the axis of the propulsion shaft, and the expander cone is rotatably mounted in the mounting hole by a cone bearing.