CN113210474A - Core ball connecting device for bending pipe fitting to inhibit core ball from shaking - Google Patents
Core ball connecting device for bending pipe fitting to inhibit core ball from shaking Download PDFInfo
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- CN113210474A CN113210474A CN202110510649.8A CN202110510649A CN113210474A CN 113210474 A CN113210474 A CN 113210474A CN 202110510649 A CN202110510649 A CN 202110510649A CN 113210474 A CN113210474 A CN 113210474A
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- connecting body
- core
- core ball
- wedge
- electromagnet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a core ball connecting device for inhibiting core ball shaking by bending a pipe fitting. First connector, second connector and star drive plate coaxial arrangement, reset spring one end rigid coupling is in the arc spout of first rotary disk, the reset push pedal rigid coupling on the other end and the second connector, pressure spring one end rigid coupling is in the spacing groove of star drive plate, the wedge rigid coupling in the rectangle spout of the other end and star drive plate, the electro-magnet is installed in the rectangular hole of star drive plate, when the electro-magnet is not electrified, the relative first connector of second connector can only unidirectional rotation under the extrusion of wedge, when the electro-magnet is electrified, the relative first connector of second connector can bidirectional rotation, and can resume to initial position under reset spring's effect. The invention can be used for connecting multiple-ball-joint core rods used in pipe bending, can inhibit the shaking of core balls and improve the bending quality.
Description
Technical Field
The invention belongs to the field of pipe bending forming, and particularly relates to a core ball connecting device for inhibiting core ball shaking in pipe bending.
Background
The bent pipe is widely applied to various industrial fields, and the numerical control bent pipe technology is continuously developed and advanced. In the pipe bending process, in order to reduce or eliminate the defects of pipe wall collapse, cross section distortion, corrugation and the like of the pipe, a core bending method is generally adopted, and fillers such as core rods and the like are filled in the pipe to be bent to serve as supports for pipe bending. The flexible core rod is used as a support under the condition that the requirement on the bending quality of the pipe fitting is high, the multi-section connecting structure of the flexible core rod mainly comprises a chain type, a ball hinge type and other forms, and the multi-ball-joint flexible core rod can effectively control the cross section flattening deformation of the pipe fitting in the bending process.
The chain type connection mode is generally used for plane bending of pipe fittings, a multi-ball-joint core rod used when the pipe fittings are bent comprises a core shaft and a plurality of core balls, the diameter of each core ball is slightly smaller than the inner diameter of each pipe fitting, a certain gap exists between the core ball and the pipe fittings, and when the pipe fittings are bent, the core balls shake due to collision of the pipe fittings on the core balls, and the bending section quality and the wall thickness of the pipe fittings are affected.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a core ball connecting device for inhibiting the core ball from shaking in the pipe bending process, which is used for connecting a plurality of sections of core rods used in the plane bending process of the pipe, can effectively inhibit the core ball from shaking in the pipe bending process and improve the bending quality.
The technical scheme adopted by the invention is as follows:
core ball connecting device for bending pipe fitting to inhibit core ball from shaking
The core ball connecting device is used for connecting the mandrel and the core ball chain, the core ball chain consists of a plurality of core balls, two adjacent core balls are connected through the core ball connecting device, and the core ball connecting device, the mandrel and the core balls jointly form a core rod;
the first connecting body and the second connecting body are coaxially butted, and are cylindrical structures; the first connecting body is provided with an arc-shaped groove on the butt joint surface with the second connecting body, a reset spring is arranged in the arc-shaped groove, a reset push plate is fixed on the butt joint surface of the second connecting body with the first connecting body, and the reset push plate is slidably embedded in the arc-shaped groove of the first connecting body; one end of the arc-shaped groove is connected with one end of a return spring, and the other end of the return spring is connected with a return push plate;
the second connecting body is provided with a stepped hole, a star-shaped transmission disc is arranged in a large hole of the stepped hole, one side of the star-shaped transmission disc, which is close to the first connecting body, is provided with a circular boss in clearance fit with a small hole of the stepped hole, the butt joint surface of the first connecting body is provided with a threaded hole for mounting a bolt, and the circular boss is coaxially and fixedly connected with the first connecting body through the bolt;
the large hole of the stepped hole faces to one side far away from the first connecting body;
two connecting plates connected with the core shaft or the core ball are arranged on two sides of the core ball connecting device and are respectively fixed on the first connecting body and the second connecting body.
The first connecting body of the core rod connecting device is fixedly connected with the core shaft or the core ball through a connecting plate by a bolt, and the second connecting body is fixedly connected with the core ball through a connecting plate by a bolt; the connecting parts of the mandrel and the mandrel ball and the mandrel connecting device are provided with rectangular holes for embedding the connecting plates, and the distance between the adjacent mandrel balls is controlled by adjusting the depth of the rectangular holes.
Star drive plate is the disc that the equidistant four the same breachs of opening of outer peripheral face, and the incision of every breach is the right angle face that section I and section II are constituteed, and section I is opened there is the rectangle spout that is used for placing the wedge, and section II is opened there is the spacing groove that is used for fixed compression spring, and the wedge is connected with compression spring's free end, and the wedge can be followed the rectangle spout and moved towards the direction of keeping away from or being close to the spacing groove. The opening directions of the four gaps are the same.
One side of each rectangular sliding groove of the star-shaped transmission disc is provided with a rectangular hole communicated with the rectangular sliding grooves, an electromagnet is placed in each rectangular hole, and the rectangular hole correspondingly arranged in each rectangular sliding groove is located below the limiting groove.
The wedge-shaped block is made of a magnetic material; the wedge blocks are propped against the inner wall of the stepped hole under the action of the pressure spring, and the contact surface of the wedge blocks and the inner wall of the stepped hole is a curved surface attached to the inner wall of the stepped hole.
When the electromagnet is electrified, the wedge block overcomes the elasticity of the pressure spring and slides in the rectangular sliding groove of the star-shaped transmission disc towards the direction close to the electromagnet, so that the wedge block is separated from the second connector, and after the electromagnet is powered off, the acting force of the electromagnet on the wedge block disappears.
When the electromagnet is not electrified, the wedge-shaped block extrudes the inner wall of the stepped hole of the second connector under the action of the pressure spring; when the electromagnet is not electrified, the second connecting body can rotate relative to the first connecting body in a certain direction under the action of external force to compress the reset spring, and the reset push plate slides along the arc-shaped sliding groove of the first connecting body under the driving of the reset spring; the second connecting body is locked relative to the first connecting body in the rotation in the opposite direction due to external acting force, and the relative rotation cannot occur in the opposite direction.
Working method of core ball connecting device for inhibiting core ball shaking in pipe bending
The method comprises the following steps:
before the pipe fitting is bent, all electromagnets in the mandrel connecting device are powered off, the wedge-shaped block abuts against the inner wall of the stepped hole of the second connecting body under the action of the pressure spring, and the second connecting body is kept at an initial position under the action of the return spring, namely all mandrel balls and the mandrel are in a same straight line; then placing the core rod in the pipe fitting;
in the bending process of the pipe fitting, the electromagnet is powered off, the pipe wall deforms to generate pressure on the core ball, then the force is transmitted to the core rod connecting device, the second connecting body has a rotation trend relative to the first connecting body, and the contact surface of the wedge-shaped block and the inner wall of the stepped hole generates friction force; if the component direction of the friction force on the central axis of the spring, which is borne by the wedge-shaped block, is the same as the elastic direction of the spring, the second connecting body and the first connecting body are self-locked under the action of the friction force and cannot rotate relatively; if the component force direction of the friction force on the central axis of the spring, which is borne by the wedge-shaped block, is opposite to the elastic force direction of the spring, the wedge-shaped block tends to move towards the electromagnet, the pressure between the inner wall of the stepped hole and the wedge-shaped block is gradually reduced to zero, and the second connecting body overcomes the elastic force of the return spring and rotates relative to the first connecting body; the second connector can only rotate relative to the first connector in one direction, so that the core ball is prevented from shaking in the tube.
After the pipe fitting is bent, the electromagnet is electrified, the magnetic force action of the electromagnet on the wedge block overcomes the elastic force action of the pressure spring, the wedge block slides towards the direction close to the electromagnet along the rectangular sliding groove, the wedge block is separated from the inner wall of the stepped hole of the second connector at the moment, the second connector can rotate in two directions relative to the first connector, and then the mandrel is pulled out of the pipe fitting.
The invention has the beneficial effects that:
(1) the invention can only rotate in one direction between the two connectors when the electromagnet is not electrified, can inhibit the core ball from colliding with the pipe wall in the bending process due to shaking, and improves the quality of the bending section and the wall thickness of the pipe.
(2) The invention can adjust the position of the wedge block by electrifying the electromagnet, so that the two connectors can rotate in two directions, and the mandrel can be conveniently withdrawn from the bent pipe fitting.
(3) The invention can make the two connectors restore to the initial position through the return spring, so that the core ball and the core rod are in a straight line, the core ball can not droop due to self weight, and the installation before use is convenient.
Drawings
FIG. 1 is a schematic illustration of an explosive structure according to the present invention;
FIG. 2 is a schematic structural diagram of a first connector according to the present invention;
FIG. 3 is a schematic view of a second linker structure of the invention;
FIG. 4 is a schematic view of the star drive disk configuration of the present invention, (a) and (b) are schematic views at two different angles;
FIG. 5 is a schematic view of the overall structure of the present invention;
FIG. 6 is a cross-sectional view of the overall construction of the present invention;
FIG. 7 is a schematic illustration of mandrel attachment of the present invention;
FIG. 8 is a schematic diagram of the process of the present invention.
In the figure: 1. the device comprises a first connecting body, a second connecting body, a third connecting body, a fourth connecting body, a fifth connecting body, a sixth connecting body, a seventh connecting body, a sixth connecting body, a seventh connecting body, a sixth connecting body, a seventh connecting body, a sixth connecting body, a fifth connecting body, a sixth connecting body, a fifth connecting body, a fourth connecting body, a fifth connecting body, a fourth connecting body, a fifth connecting body, a fourth connecting body, a fifth connecting body, a fourth connecting.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in figure 1, the core ball connecting device for inhibiting the core ball from shaking in pipe bending comprises a first connecting body 1, a second connecting body 2, a reset push plate 3, a reset spring 4, a star-shaped driving disc 5, a wedge-shaped block 6, a pressure spring 8 and an electromagnet 9, wherein the first connecting body, the second connecting body and the star-shaped driving disc are coaxially arranged.
As shown in fig. 2, the main body of the first connecting body 1 is cylindrical, a connecting plate is attached to one side of the main body, a threaded hole and a circular arc chute are formed in the end face of the cylindrical part, the threaded hole is used for being connected with the star-shaped driving disc 5, and the circular arc chute is used for installing the return spring 4.
As shown in FIG. 3, the second connecting body 2 has a cylindrical main body part with a connecting plate attached to one side, and a stepped hole is formed in the center of the cylindrical main body part for mounting with the first connecting body 1 and the star drive plate 5.
As shown in fig. 4, star drive plate 5 is the disc that the equidistant four the same breachs that have of outer peripheral face, and the incision of every breach is the right angle face that I502 of cross-section and II 501 are constituteed of cross-section, and I division in cross-section has the rectangle spout that is used for placing wedge 7, and wedge 7 can slide in the rectangle spout, and II 501 divisions in cross-section have the spacing groove to be used for fixed compression spring 8, and star drive plate 5 evenly opens has four rectangular holes of placing electro-magnet 9, and four rectangular holes communicate with each other with above-mentioned rectangle spout.
As shown in fig. 1, 5 and 6, the first connecting body 1 and the second connecting body 2 are coaxially installed, the reset push plate 3 is fixedly connected to the second connecting body 2, when the first connecting body 1 and the second connecting body 2 relatively rotate, the reset push plate 3 can slide in the circular arc-shaped sliding groove of the first connecting body 1, the reset spring 4 is installed in the circular arc-shaped sliding groove of the first connecting body 1, one end of the reset spring is fixedly connected to the first connecting body 1, the other end of the reset spring is connected to the reset push plate 3 of the second connecting body 2, the second connecting body 2 can rotate relative to the first connecting body 1 under an external acting force to compress the reset spring 4, and when the electromagnet 9 is powered on and no external acting force exists, the reset spring 4 can restore the second connecting body 2 to an initial position, that is, all the core balls 12 and the core shaft 11 share a straight line; the star-shaped transmission disc 5 is coaxial with the second connector 2 and is arranged in a stepped hole of the second connector 2, a circular boss of the star-shaped transmission disc 5 penetrates through a small hole of the stepped hole of the second connector 2 and is coaxially and fixedly connected with the first connector 1 through a bolt 6, and the second connector 2 can rotate relative to the first connector 1 and the star-shaped transmission disc 5; four pressure springs 8 are respectively arranged in a limiting groove of the section II 501 of the star-shaped transmission disc 5, the wedge-shaped blocks 7 are made of magnetic materials and are fixedly connected with the free ends of the pressure springs 8 and arranged in the rectangular sliding grooves, one ends of the wedge-shaped blocks 7 are rectangular blocks and can slide in the rectangular sliding grooves of the star-shaped transmission disc 5, one ends of the wedge-shaped blocks 7 are cam block-shaped, clamping of the second connecting bodies 2 is facilitated, and four electromagnets 9 are arranged in rectangular holes of the star-shaped transmission disc 5; when the core ball is not electrified, the wedge block 7 is contacted with the inner wall of the stepped hole of the second connector 2 under the action of the pressure spring 8, as shown in fig. 8, when the core ball is subjected to an external force which causes the second connector 2 to have a clockwise rotation trend relative to the first connector 1, the friction force between the inner wall of the stepped hole of the second connector 2 and the wedge block 7 causes the wedge block 7 to overcome part of the elastic force of the pressure spring 8, the pressure between the inner wall of the stepped hole of the second connector 2 and the wedge block 7 is reduced, the wedge block 7 has a trend of moving towards the electromagnet 9, the pressure between the inner wall of the stepped hole and the wedge block 7 is reduced, the friction force is reduced, the second connector 2 rotates clockwise relative to the first connector 1, when the core ball is subjected to the external force which causes the second connector 2 to have a counterclockwise rotation trend relative to the first connector 1, the pressure between the inner wall of the stepped hole of the second connector 2 and the wedge block 7 is increased, the friction between the inner wall of the stepped hole of the second connector 2 and the wedge block 7 is increased, so that the second connector 2 and the first connector 1 are self-locked and cannot rotate anticlockwise, and the inner wall of the circular groove of the second connector 2 enables the second connector 2 to rotate only in one direction relative to the first connector 1 under the extrusion action of the wedge block 7; when the power is on, the magnetic force action of the electromagnet 9 on the wedge block 7 overcomes the elastic force action of the pressure spring 8, so that the wedge block 7 slides in the rectangular sliding groove of the star-shaped transmission disc 5 towards the direction close to the electromagnet 9, the wedge block 7 is separated from the inner wall of the circular sliding groove of the second connector 2, and the second connector 2 can rotate in two directions relative to the first connector 1.
As shown in fig. 7, the first connecting body 1 of the mandrel connecting device 10 of the present embodiment and the mandrel 11 or the core ball 12 can be fixed by a bolt, the second connecting body 2 and the core ball 12 can be fixed by a bolt, the mandrel 11 and the core ball 12 can be opened with rectangular holes of different depths for connecting with the mandrel connecting device 10 according to requirements to control the distance between the ball joints, and the mandrel connecting device 10, the mandrel 11 and the core ball 12 together form a mandrel.
The specific implementation mode is as follows:
(1) before the pipe fitting is bent, the electromagnet 9 of the mandrel connecting device 10 is powered off, the second connecting body 2 is kept at the initial position by the return spring 4, namely all the mandrel balls 12 and the mandrel 11 are positioned on the same straight line, the wedge block 7 is contacted with the inner wall of the circular groove of the second connecting body 2 under the action of the pressure spring 8, and the mandrel is placed in the pipe fitting.
(2) In the pipe bending process, as shown in fig. 8, the electromagnet 9 is kept powered off, the pipe wall deforms to generate pressure on the core ball 12, then the force is transmitted to the core rod connecting device 10, the wedge block 7 generates extrusion on the inner wall of the circular groove of the second connecting body 2 under the action of the pressure spring 8, so that the second connecting body 2 can only rotate clockwise relative to the first connecting body 1 and cannot rotate anticlockwise, and shaking of the core ball 12 in the pipe can be effectively avoided.
(3) After the pipe fitting is bent, the electromagnet 9 is electrified, the magnetic force action of the electromagnet 9 on the wedge block 7 overcomes the elastic force action of the pressure spring 8, the wedge block 7 slides in the rectangular sliding groove of the star-shaped transmission disc 5 towards the direction close to the electromagnet 9, the wedge block 7 is separated from the inner wall of the circular sliding groove of the second connector 2, the second connector 2 can rotate in two directions relative to the first connector 1 and drag the mandrel 11, and the mandrel is withdrawn from the pipe fitting.
Claims (8)
1. A core ball connecting device for bending a pipe fitting to inhibit the shake of core balls is used for connecting a mandrel (11) and a core ball chain, the core ball chain is composed of a plurality of core balls (12), two adjacent core balls (12) are connected through the core ball connecting device, and the core ball connecting device, the mandrel and the core balls jointly form a core rod, and is characterized by comprising a first connecting body (1), a second connecting body (2) and a star-shaped driving disc (5);
the first connecting body (1) and the second connecting body (2) are coaxially arranged in a butt joint mode, and the first connecting body (1) and the second connecting body (2) are cylindrical structures; an arc-shaped groove is formed in the butt joint surface of the first connecting body (1) and the second connecting body (2), a reset spring (4) is installed in the arc-shaped groove, a reset push plate (3) is fixed on the butt joint surface of the second connecting body (2) and the first connecting body (1), and the reset push plate (3) is embedded in the arc-shaped groove of the first connecting body (1) in a sliding mode; one end of the arc-shaped groove is connected with one end of a return spring (4), and the other end of the return spring (4) is connected with a return push plate (3);
a stepped hole is formed in the second connecting body (2), a star-shaped driving disc (5) is installed in a large hole of the stepped hole, a circular boss which is in clearance fit with a small hole of the stepped hole is arranged on one side, close to the first connecting body (1), of the star-shaped driving disc (5), a threaded hole for installing a bolt (6) is formed in the butt joint face of the first connecting body (1), and the circular boss is coaxially and fixedly connected with the first connecting body (1) through the bolt (6);
two connecting plates (14) connected with the mandrel (11) or the core ball (12) are arranged on two sides of the core ball connecting device, and the two connecting plates (14) are respectively fixed on the first connecting body (1) and the second connecting body (2).
2. The core ball connecting device for inhibiting the core ball from shaking in pipe bending as claimed in claim 1, wherein the first connecting body of the core rod connecting device is fixed with the core shaft or the core ball through a connecting plate (14) in a bolt connection way, and the second connecting body is fixed with the core ball through a connecting plate (14) in a bolt connection way; rectangular holes for embedding the connecting plates (14) are formed in the connecting positions of the mandrel and the mandrel connecting device and the connecting positions of the mandrel and the mandrel connecting device, and the distance between the adjacent mandrels is controlled by adjusting the depth of the rectangular holes.
3. The core ball connecting device for inhibiting the core ball from shaking in pipe bending as claimed in claim 1, wherein the star drive disk (5) is a disk with four same notches equally spaced on the outer peripheral surface, the notch of each notch is a right-angle surface consisting of a section I (502) and a section II (501), the section I is provided with a rectangular sliding groove for placing the wedge block (7), the section II (501) is provided with a limiting groove for fixing the pressure spring (8), the wedge block (7) is connected with the free end of the pressure spring (8), and the wedge block (7) can move in the direction away from or close to the limiting groove along the rectangular sliding groove.
4. The core ball connecting device for restraining the core ball from shaking in pipe bending according to claim 3, wherein the star-shaped driving disc (5) is provided with a rectangular hole communicated with the rectangular sliding grooves at one side of each rectangular sliding groove, an electromagnet (9) is placed in each rectangular hole, and the rectangular hole correspondingly arranged on each rectangular sliding groove is positioned below the limiting groove.
5. A ball and core joint arrangement for bending tubular members to inhibit ball and core wobble as claimed in claim 1 wherein said wedge blocks (7) are of magnetic material; the wedge block props against the inner wall of the stepped hole under the action of the pressure spring (8), and the contact surface of the wedge block and the inner wall of the stepped hole is a curved surface attached to the inner wall of the stepped hole.
6. The connecting device for the core ball used for inhibiting the core ball from shaking in the pipe bending process of claim 1, wherein when the electromagnet (9) is electrified, the wedge block (7) overcomes the elastic force of the pressure spring and slides in the rectangular sliding groove of the star-shaped driving disc towards the direction close to the electromagnet, so that the wedge block is separated from the second connecting body, and after the electromagnet is powered off, the acting force of the electromagnet (9) on the wedge block (7) disappears.
7. The core ball connecting device for restraining the core ball from shaking in pipe bending as claimed in claim 1, characterized in that when the electromagnet (9) is not electrified, the wedge block (7) presses the inner wall of the stepped hole of the second connecting body (2) under the action of the pressure spring (8);
when the electromagnet (9) is not electrified, the second connecting body (2) can only rotate in one direction relative to the first connecting body (1) under the action of external force; the second connecting body (2) rotates towards one direction relative to the first connecting body (1) under the action of external force and enables the reset spring (4) to compress, and the reset push plate (3) slides along the arc-shaped sliding groove of the first connecting body (1) under the driving of the reset spring (4); the second connecting body (2) is locked by the rotation in the opposite direction relative to the first connecting body under the action of external force, and the relative rotation cannot occur in the opposite direction.
8. The working method of the core ball connecting device for inhibiting the core ball from shaking in the bending process of the pipe fitting according to any one of claims 1 to 7 is characterized by comprising the following steps of:
(1) before the pipe fitting is bent, all electromagnets (9) in the mandrel connecting device (10) are powered off, the wedge-shaped block (7) abuts against the inner wall of the stepped hole of the second connecting body (2) under the action of the pressure spring (8), the second connecting body (2) is kept at an initial position under the action of the return spring (4), namely all the core balls (12) and the mandrel (11) are in a same straight line; then placing the core rod in the pipe fitting;
(2) in the pipe bending process, the electromagnet (9) is powered off, the pipe wall deforms to generate pressure on the core ball (12), then the force is transmitted to the core rod connecting device (10), the second connecting body (2) has a rotation trend relative to the first connecting body (1), and the contact surface of the wedge-shaped block and the inner wall of the stepped hole generates friction force; if the component direction of the friction force on the central axis of the spring, which is borne by the wedge-shaped block (7), is the same as the elastic direction of the spring, the second connecting body (2) and the first connecting body (1) are self-locked under the action of the friction force and cannot rotate relatively; if the component force direction of the friction force on the central axis of the spring, which is borne by the wedge-shaped block, is opposite to the elastic force direction of the spring, the wedge-shaped block (7) generates a trend of moving towards the electromagnet (9), the pressure between the inner wall of the stepped hole and the wedge-shaped block (7) is gradually reduced to zero, and the second connecting body (2) overcomes the elastic force of the return spring and rotates relative to the first connecting body (1); the second connecting body (2) can only rotate in one direction relative to the first connecting body (1) so as to avoid the shaking of the core ball (12) in the tube.
(3) After the pipe fitting is bent, the electromagnet (9) is electrified, the magnetic force action of the electromagnet (9) on the wedge block (7) overcomes the elastic force action of the pressure spring (8), the wedge block (7) slides towards the direction close to the electromagnet (9) along the rectangular sliding groove, the wedge block (7) is separated from the inner wall of the stepped hole of the second connector (2), the second connector (2) can rotate in two directions relative to the first connector (1), and then the mandrel is withdrawn from the pipe fitting by dragging the mandrel (11).
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| CN202110510649.8A CN113210474B (en) | 2021-05-11 | 2021-05-11 | Core ball connecting device for bending pipe fitting to inhibit core ball from shaking |
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| CN202110510649.8A CN113210474B (en) | 2021-05-11 | 2021-05-11 | Core ball connecting device for bending pipe fitting to inhibit core ball from shaking |
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| CN113210474B CN113210474B (en) | 2022-05-17 |
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