CN116251897A - Automatic rotation device of pipe expanding die and electric pipe expander thereof - Google Patents

Abstract

The invention relates to the technical field of electric pipe expanders, in particular to an automatic pipe expander die rotating device and an electric pipe expander thereof, comprising: the limiting seat is internally provided with a movable cavity; the push rod is movably arranged in the movable cavity, and the front end of the push rod is provided with a thimble; the rotating mechanism is sleeved on the push rod and is arranged in the movable cavity, and the end part of the rotating mechanism is movably clamped with the pipe expanding die; at least three rollaway nest are axisymmetrically distributed on the outer wall of the push rod, and each rollaway nest is provided with a bending section; the inner wall of the rotating mechanism is provided with balls with the same number as the ball tracks, and the balls are arranged in the corresponding ball tracks; the push rod reciprocates in the limiting seat, so that the balls roll along the rollaway nest, pass through the bending section and drive the rotating mechanism to reciprocate in the limiting seat, and the rotation of the pipe expanding die is realized. According to the invention, three raceways are symmetrically distributed on the outer wall of the push rod, and the concentricity of the push rod and the one-way bearing is ensured by utilizing the cooperation between the raceways and the balls, so that the push rod is more stable in use and long in service life.

Description

Automatic rotation device of pipe expanding die and electric pipe expander thereof

Technical Field

The invention relates to the technical field of electric pipe expanders, in particular to an automatic pipe expander and an automatic pipe expander rotating device of the automatic pipe expander.

Background

The expander is a device for extruding and expanding one end of a pipe, which can be a plastic pipe or a metal thin pipe.

The design of the existing pipe expander is as in Chinese patent 2022205403704, and describes a resetting device and a novel pipe expander, wherein the outer wall of a mandrel is provided with a cam groove, and the telescopic movement of a push rod is converted into the rotating force of a rotating seat by utilizing the cooperation of a one-way bearing and a ball, so that the opening supporting device is driven to rotate.

Because the design of single cam groove is adopted, in the in-service use process, external force deviating from the axis can be given to the mandrel, so that after the mandrel is propped against the inner ring of the one-way bearing, additional friction force can be generated to prevent the movement of the mandrel and the rotation of the rotating seat, meanwhile, the power transmission efficiency is influenced, and after long-time use, additional abrasion can be generated to the inner ring of the one-way bearing and the mandrel, and the normal operation of equipment is influenced.

Disclosure of Invention

The invention aims to provide an automatic rotation device of a pipe expanding die and an electric pipe expander thereof, wherein three raceways are axially symmetrically distributed on the outer wall of a push rod, and the concentricity of the push rod and a one-way bearing is ensured by utilizing the cooperation between a plurality of raceways and balls, so that the problems of easiness in abrasion, influence on rotation and low transmission efficiency in the prior art are solved.

The purpose of the invention is realized in the following way:

an automatic pipe expanding die rotating device, comprising:

the limiting seat is internally provided with a movable cavity;

the push rod is movably arranged in the movable cavity, and the front end of the push rod is provided with a thimble;

the rotating mechanism is sleeved on the push rod and is arranged in the movable cavity, and the end part of the rotating mechanism is movably clamped with the pipe expanding die;

at least three rollaway nest are axisymmetrically distributed on the outer wall of the push rod, and each rollaway nest is provided with a bending section;

the inner wall of the rotating mechanism is provided with balls with the same number as the ball tracks, and the balls are arranged in the corresponding ball tracks;

the push rod reciprocates in the limiting seat, so that the balls roll along the rollaway nest, pass through the bending section and drive the rotating mechanism to reciprocate in the limiting seat, and the rotation of the pipe expanding die is realized.

Preferably, the raceways are uniformly distributed on the outer wall of the push rod.

Preferably, the inner wall of the raceway comprises:

a first arc-shaped portion located at the bottom of the raceway;

two second arc-shaped parts which are respectively positioned at two sides of the first arc-shaped part;

when the ball is arranged in the rollaway nest, the outer wall of the ball is movably abutted against the second arc-shaped part, and a gap exists between the ball and the first arc-shaped part.

Preferably, the raceway has at least:

the first straight section is distributed along the length direction of the push rod;

a second straight section distributed along the length direction of the push rod and penetrating the front end part of the push rod

And the bending section is connected with the first straight section and the second straight section, so that the first straight section and the second straight section are distributed in a staggered manner.

Preferably, the rotation mechanism has at least:

the rotary guide sleeve is rotatably arranged in the limiting seat, and the front end of the rotary guide sleeve is provided with a first convex tooth matched with the pipe expanding die;

the one-way bearing is sleeved on the push rod, the outer ring of the one-way bearing is connected with the rotary guide sleeve, and the ball is arranged on the inner ring;

the rotation of the push rod is matched with the ball and the guide bearing, so that the rotary guide sleeve rotates in the limit seat in a unidirectional manner.

Preferably, a damping groove is formed in the outer wall of the front end of the rotary guide sleeve, a damping ring is installed in the damping groove, and the outer wall of the damping ring is in sliding abutting connection with the inner wall of the limiting seat.

A motorized expander, comprising:

a housing;

a driving device installed in the housing;

the automatic pipe expanding die rotating device is connected with the driving device.

Compared with the prior art, the invention has the following outstanding and beneficial technical effects:

1. the design of the invention is that three raceways are symmetrically distributed on the outer wall of the push rod, the concentricity of the push rod and the one-way bearing is ensured by utilizing the cooperation between the raceways and the balls, the push rod is prevented from generating extra off-axis force, the abrasion between the push rod and the one-way bearing is reduced, and the service life is ensured.

Simultaneously, friction is reduced, and stability of movement is ensured.

2. The design of the second arc-shaped part can support the ball, so that the ball rolls in the roller path more stably, the condition that the ball shakes left and right in the roller path can be avoided, the abrasion is further reduced, and the ball can be more stable in running.

Drawings

Fig. 1 is a schematic overall structure of embodiment 1 of the present invention.

Fig. 2 is an overall cross-sectional view of embodiment 1 of the present invention.

Fig. 3 is a schematic view of the hidden housing and part of the driving device according to embodiment 1 of the present invention.

Fig. 4 is a cross-sectional view of fig. 3.

Fig. 5 is a schematic view showing a part of the structure of the push rod and the one-way bearing according to embodiment 1 of the present invention.

Fig. 6 is a schematic structural view of a push rod and a steel ball according to embodiment 1 of the present invention.

Fig. 7 is a cross-sectional view of B-B of fig. 6.

Fig. 8 is an enlarged schematic view of area a of fig. 7.

Fig. 9 is a schematic diagram of a part of a hidden limiting seat according to embodiment 1 of the present invention.

Reference numerals:

1. a housing;

2. a driving device; 21. a motor; 22. a speed reducer; 23. a first cam; 24. a battery;

3. automatic rotation device of pipe expanding mould; 31. a limit seat; 311. a movable cavity; 32. a push rod; 321. a thimble; 322. a connecting column; 323. a connection hole; 324. an elastic cylindrical pin; 33. a rotation mechanism; 331. rotating the guide sleeve; 332. a one-way bearing; 333. a damping ring; 34. a raceway; 341. a first arc-shaped portion; 342. a second arc-shaped portion; 343. a first straight section; 344. a second straight segment; 345. bending sections; 35. a ball;

4. a pipe expanding die; 41. a locking cap; 42. conical claws; 43. a tightening member;

5. an elastic reset mechanism; 51. a first spring; 52. spring seat.

Detailed Description

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.

[ example 1 ]

As shown in fig. 1-2, an electric pipe expander comprises a shell 1, a driving device 2, an automatic pipe expander rotating device 3 and an automatic pipe expander 4, wherein the driving device 2 and the automatic pipe expander rotating device 3 are arranged in the shell 1, and the pipe expander 4 is arranged at the front end and is movably clamped with the front end of the automatic pipe expander rotating device 3;

the driving device 2 is used for providing power, the output shaft of the driving device 2 is vertically arranged (the installation direction of the output shaft is not unique, the embodiment is arranged in the vertical direction for unfolding), the first cam 23 is arranged on the output shaft, and the first cam 23 is driven to rotate in the shell 1 through the output shaft.

As shown in fig. 3-4, the automatic pipe expanding die rotating device 3 mainly comprises a limiting seat 31, a push rod 32 and a rotating mechanism 33, wherein a plurality of balls 35 are arranged in the rotating mechanism 33.

Referring to fig. 2, the limiting seat 31 is horizontally installed in the housing 1, the limiting seat 31 is provided with a movable cavity 311, the movable cavity 311 penetrates through the front end and the rear end of the limiting seat 31, the rotating mechanism 33 is installed at the front end of the movable cavity 311, the push rod 32 is horizontally arranged in the movable cavity 311 and is arranged in the rotating mechanism 33 in a penetrating mode, the front end of the push rod 32 is provided with a thimble 321, the thimble 321 stretches into the pipe expanding die 4, the rear end of the push rod 32 abuts against the outer wall of the first cam 23, the push rod 32 is pushed to move by the rotation of the first cam 23, and an elastic reset mechanism 5 is further arranged on the push rod 32 to ensure telescopic movement.

As shown in fig. 5-7, three rolling paths 34 are formed on the outer wall of the push rod 32, the rolling paths 34 are axisymmetrically distributed on the push rod 32 (i.e. the connecting line C of the first rolling path 34 and the axis of the push rod 32, and the connecting line D of the third rolling path 34 and the axis of the push rod 32, and the included angle α between C and D is necessarily smaller than 180 degrees), and the optimal solution is uniformly distributed on the outer wall of the push rod 32.

The number of the balls 35 is equal to that of the raceways 34, the balls 35 are arranged in the corresponding raceways 34, and the push rod 32 moves, so that on one hand, the ejector pin 321 stretches the pipe expanding die 4, and meanwhile, the rotating mechanism 33 drives the pipe expanding die 4 to rotate.

The pipe expander designed in this way can ensure more uniform pipe expansion of the pipe fitting, the flatness of the inner wall, and the risk of water leakage after pipe installation is reduced.

The invention can always make the push rod 32 concentric with the rotating mechanism 33 by the constraint of the ball 35 and the rollaway nest 34, and meanwhile, the push rod is contacted with the unidirectional bearing only by the ball, so that when the push rod 32 moves, the extra off-axis force to the push rod 32 can be avoided, the abrasion between the push rod 32 and the unidirectional bearing 332 is reduced, and the service life is ensured.

As shown in fig. 6, the raceway 34 further has at least three sections, respectively:

a first straight section 343 distributed along the length of the push rod 32;

the second straight section 344 is also distributed along the length direction of the push rod 32 and penetrates the front end of the push rod 32

The two ends of the bending section 345 are connected with the first straight section 343 and the second straight section 344, so that the first straight section 343 and the second straight section 344 are distributed in a staggered manner while the complete and continuous raceway 34 is formed.

The second straight run 344 extends through the front end of the push rod 32 to facilitate the mounting of the ball 35 and the one-way bearing 332 on the push rod 32.

The straight segment is used for telescopic movement of the push rod 32, so that the ejector pins 321 can open the pipe expanding die 4.

After the design, under the telescopic movement of the push rod 32, the ball 35 drives the rotating mechanism 33 to rotate when passing through the bending section 345, so as to drive the pipe expanding die 4 to rotate, and complete the rotary pipe expanding action.

As shown in fig. 8, the inner wall of each segment of the raceway 34 includes: a first arc portion 341 and two second arc portions 342;

the first arc-shaped portion 341 is located at the bottom of the raceway 34;

the two second arc-shaped parts 342 are respectively positioned at two sides of the first arc-shaped part 341;

when the ball 35 is placed in the raceway 34, the outer wall of the ball 35 abuts against the second arc portion 342 without contacting the first arc portion 341, and a gap exists between the ball 35 and the first arc portion 341.

The design of the second arc-shaped part 342 in the invention can support the ball 35, reduce contact, reduce abrasion, ensure that the ball 35 rolls more stably in the raceway 34, avoid the condition that the ball 35 shakes left and right in the raceway 34, and ensure that the ball 35 runs more stably and smoothly, and reduce the jamming phenomenon.

As shown in fig. 9 and 4, the rotation mechanism 33 includes: a rotating guide sleeve 331 and a one-way bearing 332;

the rotary guide sleeve 331 is arranged in the limit seat 31, and as the first boss is arranged in the limit seat 31 and the second boss is arranged outside the rotary guide sleeve 331, the first boss and the second boss are in butt joint, and therefore the rotary guide sleeve 331 cannot be separated from the limit seat 31 from the front end; the front end of the rotary guide sleeve 331 is circumferentially formed with a plurality of first convex teeth, the rear end of the pipe expanding die 4 is circumferentially formed with second convex teeth, and the first convex teeth and the second convex teeth can be mutually clamped under the action of the elastic reset mechanism 5.

The boss III is formed in the rotary guide sleeve 331, the one-way bearing 332 is installed in the rotary guide sleeve 331, the front end of the one-way bearing 332 abuts against the boss III, and the one-way bearing 332 cannot be separated from the rotary guide sleeve 331 because the elastic reset mechanism 5 always abuts against the rear end of the rotary guide sleeve 331.

The outer ring of the one-way bearing 332 is connected with the rotary guide sleeve 331, connection and fixation with the rotary guide sleeve 331 can be realized in an interference fit mode, the inner ring of the one-way bearing 332 is provided with a plurality of grooves for accommodating the balls 35, the number of the grooves can be larger than that of the balls 35, the corresponding balls 35 only need to be assembled when the one-way bearing is used, and the redundant grooves can be used for subsequent replacement.

The rotation of the push rod 32, through the cooperation of the ball 35 and the unidirectional bearing 332, makes the rotary guide sleeve 331 rotate in a unidirectional manner in the limiting seat 31.

As shown in fig. 9, a damping groove is further formed in the outer wall of the front end of the rotary guide sleeve 331, a damping ring 333 is installed in the damping groove, and the outer wall of the damping ring 333 is in sliding contact with the inner wall of the limit seat 31, and meanwhile, the function of sealing a gap can be achieved.

The damping ring 333 can be an O-shaped ring, and plays a role in damping through the O-shaped ring, so that the stability of use is ensured.

The front end of the thimble 321 is designed in a conical shape, the rear end of the thimble 321 is protruded with a connecting column 322, a connecting hole 323 is concaved inwards on the front end face of the push rod 32, the connecting column 322 is inserted into the connecting hole 323, and then the connection between the thimble 321 and the push rod 32 is realized through an elastic cylindrical pin 324.

After the split design, the processing is convenient, and meanwhile, the thimble 321 can be conveniently replaced, so that waste is avoided.

As shown in fig. 4, the tube expansion die 4 has the following structure:

the pipe expanding die 4 comprises a locking cap 41, a conical claw 42 and a tightening piece 43;

the locking cap 41 is similar to a nut in structure, two ends penetrate through and are internally provided with threads, the conical claws 42 are provided with a plurality of threads, the conical claws 42 are circumferentially arranged in the locking cap 41 to form a cylindrical shape, the outer walls of the conical claws 42 are designed in a stepped shape, the conical claws 42 form conical outer walls, meanwhile, conical spaces are formed inside the conical claws for the thimble 321 to be inserted, convex edges are formed on the outer walls of the rear ends of the conical claws 42, the end parts of the convex edges are formed into grooves, and the tightening members 43 are arranged in the grooves, so that the conical claws 42 are restrained and fixed, and the conical claws 42 have a tendency of shrinking inwards.

The tightening member 43 may terminate the attached spring.

Along with the insertion of the ejector pin 321, the elastic force of the tightening member 43 is overcome, so that the conical claws 42 are separated from each other, the outer diameter surrounded by the conical claws 42 is enlarged, and the purpose of expanding a pipe is achieved.

As shown in fig. 5, the elastic restoring mechanism 5 has the following structure:

the elastic return mechanism 5 includes a spring seat 52 and a first spring 51; the first spring 51 is sleeved on the push rod 32, the rear end of the first spring abuts against the rear end of the push rod 32, the spring seat 52 is mounted on the push rod 32, and the end face of the first spring abuts against the rear end of the rotary guide sleeve 331.

When the expanding force of the pipe expanding die 4 is insufficient and the pipe with a thicker wall thickness is not expanded, the push rod 32 always overcomes the elastic force of the first spring 51 and moves back and forth, at this time, the rotating guide sleeve 331 is still rotated under the effect of the rollaway nest and the ball, and the rotating guide sleeve 331 integrally retreats under the influence of the first convex tooth and the second convex tooth, so that the clutch-like effect is achieved, and the condition of damage to the internal structure is avoided.

As shown in fig. 2, the driving device 2 includes: the motor 21, the reduction gear 22 and the output shaft, the battery 24 is installed to casing 1 lower extreme, and the reduction gear 22 is installed at the output of motor 21, and output shaft connection reduction gear 22, concretely speaking, patent 2022205403704 can be consulted, just will not be described in detail.

[ example 2 ]

This embodiment is basically the same as the embodiment 1 except that: the number of raceways 34 may be four or five or more evenly disposed.

[ example 3 ]

This embodiment is basically the same as the embodiment 1 except that: the limiting seat 31 may be a part of the housing 1, not a separate part.

Working principle:

in the initial state, the rotating mechanism 33 is disposed at the second straight section 344 of the push rod 32, then the motor 21 is started, under the action of the first cam 23, the push rod 32 extends forward to prop up the pipe expanding die 4, during the extending process, the ball 35 passes through the bending section 345, at this time, under the action of the unidirectional bearing 332, the rotating guide sleeve 331 is driven to rotate by a certain angle, because of the meshing state of the first and second convex teeth, the rotating guide sleeve 331 is driven to rotate by a certain angle until the ball 35 moves onto the first straight section 343, the rotation of the rotating guide sleeve 331 is ended, the first cam 23 continuously rotates, the push rod 32 returns to the second straight section 344 under the action of the first spring 51, and when the push rod 32 passes through the bending position, the rotating guide sleeve 331 is allowed not to rotate along with the rotation of the inner ring of the unidirectional bearing 332, at this time, the operation just before repeating the operation is repeated, the key pipe expanding is continuously performed once, and the outer wall of the pipe expanding die 4 is stretched into the pipe fitting in steps until the required size reaches the required size.

Wherein the rotation of the pipe expanding die 4 is completed before the pipe is contacted with the inner wall of the pipe, and then the pipe is expanded by abutting the inner wall of the pipe.

The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. An automatic pipe expanding die rotating device is characterized by comprising:

a movable cavity (311) is arranged in the limit seat (31);

the push rod (32) is movably arranged in the movable cavity (311); the front end of the push rod (32) is provided with a thimble (321);

the rotating mechanism (33) is sleeved on the push rod (32) and is arranged in the movable cavity (311), and the end part of the rotating mechanism is movably clamped with the pipe expanding die (4);

at least three rollaway nest (34) are axisymmetrically distributed on the outer wall of the push rod (32), and each rollaway nest (34) is provided with a bending section (345);

the inner wall of the rotating mechanism (33) is provided with balls (35) the same as the number of the rollaway nest (34), and the balls (35) are arranged in the corresponding rollaway nest (34);

the push rod (32) reciprocates in the limiting seat (31), so that the balls (35) roll along the rollaway nest (34), and the balls (35) pass through the bending section (345) and drive the rotating mechanism (33) to reciprocate in the limiting seat (31) to realize the rotation of the pipe expanding die (4).

2. The automatic pipe expanding die rotating device according to claim 1, wherein:

the rollaway nest (34) is evenly distributed on the outer wall of the push rod (32).

3. The automatic pipe expanding die rotating device according to claim 1 or 2, wherein:

the inner wall of the raceway (34) includes:

a first arc-shaped portion (341) located at the bottom of the raceway (34);

two second arc-shaped parts (342) respectively located at both sides of the first arc-shaped part (341);

when the ball (35) is arranged in the rollaway nest (34), the outer wall of the ball (35) is movably abutted against the second arc-shaped part (342), and a gap exists between the ball (35) and the first arc-shaped part (341).

4. The automatic pipe expanding die rotating device according to claim 3, wherein:

the raceway (34) has at least:

a first straight section (343) which is distributed along the length direction of the push rod (32);

a second straight section (344) which is distributed along the length direction of the push rod (32) and penetrates the front end part of the push rod (32)

And the bending section (345) is connected with the first straight section (343) and the second straight section (344) so that the first straight section (343) and the second straight section (344) are distributed in a staggered manner.

5. The automatic pipe expanding die rotating device according to claim 1 or 2, wherein:

the rotation mechanism (33) has at least:

the rotary guide sleeve (331) is rotatably arranged in the limiting seat (31), and the front end of the rotary guide sleeve (331) is provided with a first convex tooth matched with the pipe expanding die (4);

the one-way bearing (332) is sleeved on the push rod (32), the outer ring of the one-way bearing (332) is connected with the rotary guide sleeve (331), and the ball (35) is arranged on the inner ring;

the rotation of the push rod (32) enables the rotary guide sleeve (331) to rotate in one direction in the limit seat (31) through the cooperation of the ball (35) and the one-way bearing (332).

6. The automatic pipe expanding die rotating device according to claim 5, wherein:

the outer wall of the front end of the rotary guide sleeve (331) is provided with a damping groove, a damping ring (333) is arranged in the damping groove, and the outer wall of the damping ring (333) is in sliding contact with the inner wall of the limit seat (31).

7. An electric expander, comprising:

a housing (1);

a driving device (2) installed in the housing (1);

an automatic pipe-expanding die rotating device (3) according to any one of claims 1-6, and connected to said driving means (2).

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