CN111516275A

CN111516275A - Non-flaring conduit connecting piece extrusion forming equipment

Info

Publication number: CN111516275A
Application number: CN202010345694.8A
Authority: CN
Inventors: 王双飞; 唐良勇; 吴海东
Original assignee: Sichuan Zhongzi Technology Co ltd
Current assignee: Sichuan Zhongzi Technology Co ltd
Priority date: 2020-04-27
Filing date: 2020-04-27
Publication date: 2020-08-11
Anticipated expiration: 2040-04-27
Also published as: CN111516275B

Abstract

The invention discloses an extrusion forming device for a flareless conduit connecting piece. The device comprises a cabinet, a hydraulic system, a clamping mechanism, a stretching mechanism, an operation panel and a working platform; the hydraulic system provides power for the clamping mechanism and the stretching mechanism; the stretching mechanism comprises a stretching driving mechanism and an expanding mechanism, and the expanding mechanism comprises an adapter, a anvil die, a semi-female die and a pull rod assembly, wherein the centers of the adapter, the anvil die, the semi-female die and the pull rod assembly are positioned on the same axis; the anvil is provided with a cylindrical cavity structure with four levels of diameters which are arranged in sequence; the half-cavity die is a symmetrical structure formed by combining two semicircular rings and is detachably arranged in a clamping arm of a clamping mechanism, and a die-combining gap is formed at the combining part when the two semicircular rings are combined. The device can effectively reduce the labor intensity of operators, can self-adaptively clamp the sizes of different workpiece individuals with the same theoretical specification, can realize direct closed-loop extrusion force control, further improve the quality of produced products, and solve the problems that a mold is troublesome to replace and a plurality of tools are needed to disassemble and assemble.

Description

Non-flaring conduit connecting piece extrusion forming equipment

Technical Field

The invention belongs to the technical field of mechanical design and manufacture, particularly belongs to the technical field of design and manufacture of extrusion forming processing machinery, and particularly relates to extrusion forming equipment for a flareless conduit connecting piece.

Background

In the prior art, the connection of the conduit connector is generally performed by enclosing a compressible elastic material having a certain volume, such as a polyurethane material, in a processing space, extruding the compressible elastic material to an incompressible stage, locally extruding the conduit through the deformation of the polyurethane to generate plastic deformation, and extruding the plastic deformation into an inner annular groove sleeved on a guide sleeve on the conduit, so that the conduit and the guide sleeve are tightly connected.

The method is widely used for plastic processing and connection of the flareless conduit, and the processing method is adopted in Chinese patent document CN 208930714U. In the concrete implementation of the method, there are obvious defects: firstly, a clamp mechanism needs manual operation and mechanical die assembly in operation, and then drives automatic die locking through a cylinder, so that a large workload is brought to operating personnel, and the structure only realizes automatic die locking after die assembly; secondly, in the mode of die assembly and die locking, the upper clamp and the lower clamp of the die assembly and die locking uniquely determine the die assembly position by relying on the upper matching surface and the lower matching surface, so the positions of the upper clamp and the lower clamp are always the same, and actually, different workpiece individuals of the same theoretical specification have difference in structural dimension, and the outer diameters of the different workpiece individuals have large and small sizes, which can cause some processing problems, such as interference of the die to influence die assembly and cause the clamped product, or loose clamping, so that a gap exists between the workpiece and a cavity in a half clamping die positioned in the clamps, and the workpiece and the cavity in the half clamping die do not play a supporting role, so that in processing, a pipe sleeve in a workpiece combination is extruded and deformed under the; thirdly, in the process of extruding polyurethane to realize the connection processing of the conduit, the control of the extrusion force is open, in fact, different workpiece individuals always have difference in structural dimension, the polyurethane material is used for certain times and needs to be replaced, so that each replaced individual has difference in structural dimension and density, which shows that the compression amount and the movement stroke needing to be extruded are different for each specific processing conduit workpiece, the common method is to use the pressure of a hydraulic system as a control amount to realize the compensation of the difference, and the pressure sensor is arranged on an oil path of the hydraulic system to feed back the pressure sensor to the system to realize the compensation.

Disclosure of Invention

The invention discloses an extrusion forming device for a flareless conduit connecting piece, which is based on the defects of the prior art. The invention aims to provide a method for preparing: the die can be automatically closed, the workload of workers is reduced, and the safety is improved; the size difference of the individual structure of the workpiece combination with the same specification can be self-adapted, and the machining quality of the guide pipe is improved; closed-loop control can be realized on the extrusion force during processing, and the individual structure difference of the workpiece is self-adapted; better performance and security's former.

The invention is realized by the following technical scheme:

the flaring-free guide pipe connecting extrusion forming equipment comprises a cabinet, a hydraulic system, a clamping mechanism, a stretching mechanism, an operation panel and a working platform; the method is characterized in that: the hydraulic system provides power for driving oil cylinders of the clamping mechanism and the stretching mechanism; the stretching mechanism comprises a stretching driving mechanism and an expanding mechanism, the stretching driving mechanism provides power for the expanding mechanism, and the expanding mechanism comprises an adapter, a anvil die, a semi-female die and a pull rod assembly, wherein the center of the adapter, the anvil die, the semi-female die and the pull rod assembly are positioned on the same axis, and the drawing mechanism comprises a first drawing mechanism body and a second drawing mechanism body, wherein:

one end of the adapter is in driving connection with the stretching driving mechanism;

the anvil is detachably fixed on the working platform through the anvil seat and is provided with a cylindrical cavity structure with four-stage diameters which are sequentially arranged; the die cavity with the first-stage diameter is matched with the adapter and used for accommodating and limiting the adapter to move in the die cavity, the die cavity with the second-stage diameter is used for penetrating through a pull rod of the pull rod assembly and is in sliding clearance fit with the pull rod, the die cavity with the third-stage diameter is fixedly connected with a liner of the pull rod assembly, and the die cavity with the fourth-stage diameter is matched with the outer diameter of the pipe sleeve and used for fixing the conduit connecting piece;

the semi-cavity die is a symmetrical structure formed by combining two semi-circular rings, and the two semi-circular rings are respectively detachably mounted and fixed in a half hole of a clamping arm of the clamping mechanism and are used for closing under the driving of the clamping mechanism to clamp and fix the conduit connecting piece; the joint surfaces between the two semicircular rings are planes, the maximum radial radius of the planes is smaller than that of the half-female die, and when the two semicircular rings are combined and clamped to fix the conduit connecting piece, a die-closing gap is formed at the joint part; the combined end of the half-female die and the anvil is provided with a half-female die cavity matched with the outer diameter of the pipe sleeve, and the half-female die is also axially provided with a clamping section matched with the outer diameter of the guide pipe to realize clamping and fixing.

The draw bar assembly includes: the novel energy-saving adapter comprises a pull rod, a lining, two split rings, a polyurethane sleeve and an end cap, wherein one end of the pull rod is in driving connection with the adapter, the other end of the pull rod is provided with the end cap, and the first split ring, the polyurethane sleeve and the second split ring are in limiting sleeving connection between the lining and the end cap.

The die closing gap is 0.1-0.2 mm.

The clamping mechanism comprises two clamping arms with the same structure, and each clamping arm is provided with a half hole for fixing the half female die; the two clamping arms are driven by the same clamping oil cylinder to form an equal-arm crank-link mechanism to realize opening and closing.

The equal-arm crank connecting rod mechanism comprises a clamping oil cylinder, an installation hanging frame, an elbow joint, a connecting rod, an installation seat and a clamping arm; the clamping oil cylinder is fixedly arranged on the mounting rack, and the mounting rack is fixed below the working platform; one end of the elbow joint is fixedly connected with a piston shaft of the clamping oil cylinder, and the other end of the elbow joint is provided with a shaft hole; the mounting seat is fixed below the working platform, and a shaft hole is formed in the side face of the mounting seat; each clamping arm is provided with two groups of shaft holes, and the two groups of shaft holes and the half holes are arranged in a triangular mode; the middle shaft hole of each clamping arm is hinged with the shaft hole of the mounting seat, and the lower shaft hole is fixedly connected with the same elbow joint through a connecting rod to form an equal-arm crank connecting rod mechanism.

The stretching driving mechanism comprises a stretching oil cylinder, an adapter rod, a pulling pressure sensor, a hinge mechanism and a guide mechanism which are positioned on the same axis as the bulging mechanism and are sequentially connected; the hinge mechanism comprises a hinge head, a bolt and a hinge rod, and one end of the hinge head is fixedly connected with the pull pressure sensor; the guide mechanism comprises a guide rail fixed on the working platform and a hinged sliding block, the hinged sliding block slides along the axis direction of the guide rail, one end of the hinged sliding block is hinged with a hinged head of the hinged mechanism, and the other end of the hinged sliding block is connected with a pull rod of the pull rod assembly through an adapter.

The clamping mechanism and the stretching mechanism are not limited to be driven by an oil cylinder, and can also be driven by a power device which is driven by the linear motion output of an air cylinder and a motor.

The die cavity of the half-cavity die formed by a pair of symmetrically matched half-cavity dies and the die cavity with the four-stage diameter of the anvil die form a complete die cavity, and the die cavity realizes positioning, clamping and supporting of the conduit connectors during extrusion.

The hinge mechanism of the stretching driving mechanism comprises: the hinge joint is articulated with hinge bar one end through a movable bolt, and the hinge bar other end is articulated through another bolt with articulated slider, and two bolts are removable plug structure.

The guide mechanisms are arranged in one group or two groups, and the two groups of guide mechanisms are symmetrically arranged on the working platform relative to the axis of the stretching mechanism.

The invention solves the following technical problems in the prior art and the implementation scheme: the problem that the workload of manual mold closing is large because the clamp needs to be manually moved after the guide pipe workpieces are placed and combined in the conventional device is solved; the problem that the clamp and the semi-clamp die thereof in the prior art and the implementation scheme can not be self-adaptive to the size difference of the combined individual structures of workpieces with the same specification is solved; the defect that the extrusion force control of the prior art and the implementation scheme is not accurate enough is overcome; the problems that the mold is troublesome to replace and a plurality of tools are needed to disassemble and assemble are solved.

Compared with the prior art, the invention has the following beneficial effects: the device can effectively reduce the labor intensity of operators, can self-adaptively clamp the sizes of different workpiece individuals with the same theoretical specification, can realize direct closed-loop extrusion force control, further improve the quality of produced products, and solve the problems that a mold is troublesome to replace and a plurality of tools are needed to disassemble and assemble.

Drawings

FIG. 1 is a schematic view of the whole system of the apparatus of the present invention;

FIG. 2 is a schematic view showing the connection position relationship between the stretching mechanism and the clamping mechanism;

FIG. 3 is a partial schematic view showing the connection positions of the clamp arm, the cavity block, the anvil holder and the anvil;

FIG. 4 is a schematic diagram of a cabinet configuration;

FIG. 5 is a schematic structural plan view of the stretching mechanism;

FIG. 6 is a structural sectional view of the stretching mechanism;

FIG. 7 is a schematic view of a mounting bracket structure of the stretching mechanism;

FIG. 8 is a schematic view of the hinge mechanism;

FIG. 9 is a schematic view of the guide mechanism;

FIG. 10 is a schematic view of the expanding mechanism;

FIG. 11 is a plan view of the assembled structure of the machined work piece;

FIG. 12 is a schematic cross-sectional view of the drawbar assembly configuration;

FIG. 13 is a schematic view of the clamping mechanism in a tightened state;

FIG. 14 is a schematic view showing the open/close state of the clamping mechanism;

FIG. 15 is a schematic three-dimensional view of the clamping mechanism;

FIG. 16 is a schematic view of a cavity half and its cavity configuration;

FIG. 17 is a schematic view of the clamping of the cavity halves and their gap setting;

FIG. 18 is a schematic view of the anvil and its cavity position;

FIG. 19 is a cross-sectional view of the anvil.

In the figure:

1 is a cabinet, 11 is an electric cabinet, 2 is a hydraulic system, 3 is a clamping mechanism, 31 is a clamping oil cylinder, 32 is an installation hanger, 33 is an elbow joint, 34 is a connecting rod, 35 is a pin shaft, 36 is a choke, 37 is an installation seat, and 38 is a clamping arm;

4 is a stretching mechanism, 41 is a stretching oil cylinder, 42 is a mounting bracket, 43A is an adapter rod, 43 is a stretching pressure sensor, 44 is a hinge mechanism, 441 is a hinge head, 442 is a bolt, 443 is a hinge rod, 45 is a guide mechanism, 451 is a hinge slider, 452 is a linear guide rail, 46 is an expanding mechanism, 461 is an adapter, 462 is an anvil, 462a is an anvil cavity, 462b is a cylindrical cavity, 463 is a half-female die, 463A is a half-female die left cavity, 463b is a half-female die right cavity, 464 is a pull rod assembly, 4641 is a pull rod, 4642 is a liner, 4643 is a split ring, 4644 is a polyurethane sleeve, 4645 is an end cap, 465 is a workpiece combination, 4651 is a pipe sleeve, 4652 is a conduit, 4653 is an annular groove, and 47 is an anvil seat;

reference numeral 5 denotes an operation panel, 6 denotes a work table, and X denotes a mold clamping gap.

Detailed Description

The present invention is further described below in conjunction with the following detailed description, which is intended to further illustrate the principles of the invention and is not intended to limit the invention in any way, but is equivalent or analogous to the present invention without departing from its scope.

With reference to the attached drawings.

The equipment comprises a cabinet 1, a hydraulic system 2, a clamping mechanism 3, a stretching mechanism 4, an operation panel 5 and a working platform 6.

An electric cabinet 11 and a hydraulic system 2 are also arranged in the frame of the cabinet 1; the electric cabinet 11 and the hydraulic system 2 are both fixed in the frame of the cabinet 1 through screws or bolts; when needed, the electric control box 11 and the hydraulic system 2 can be taken out from the frame of the cabinet 1 during maintenance.

The stretching mechanism 4 is arranged on the working platform 6, the clamping mechanism 3 and the stretching mechanism 4 are matched to operate, the part is arranged on the working platform 6, and the driving part of the clamping mechanism 3 and the hydraulic system 2 are matched to be arranged in a cabinet frame below the working platform 6.

The stretching mechanism 4 is arranged on the upper surface of the working platform 6 in parallel along the axial direction, the operation panel 5 is arranged on the working platform 6, the touch screen and the physical control button are arranged on the operation panel 5, and the axial line of the clamping mechanism 3 and the axial line of the stretching mechanism 4 are mutually perpendicular on the same plane.

The clamping mechanism 3 comprises a clamping cylinder 31, a mounting hanger 32, a toggle joint 33, a connecting rod 34, a pin shaft 35, a nozzle 36, a mounting seat 37 and a clamping arm 38. The clamping cylinder 31 is arranged on a horizontal supporting plate fixed on the mounting rack 32, the mounting rack 32 is provided with two vertical plates vertical to the horizontal supporting plate, the top end of each vertical plate is also provided with a horizontal fixing plate, the fixing plate of the mounting rack 32 is fixedly connected with the lower surface of the working platform 6, one end of the elbow joint 33 is fixedly connected with a piston shaft of the clamping cylinder 31, the other end of the elbow joint is provided with a shaft hole, the mounting seat 37 is fixed on the lower surface of the working platform 6, the side surface of the mounting seat 37 is provided with an axle hole, the middle position of the clamping arm 38 is provided with an axle hole corresponding to the axle hole, one end of the clamping arm is provided with another axle hole, a half hole is arranged at the other end, the shaft hole in the middle of the clamping arm 38 is hinged with the shaft hole of the mounting seat 37 through a pin shaft 35, both ends of the connecting rod 34 are provided with shaft holes, the shaft hole at one end is hinged to the shaft hole at the lower end of the clamping arm 38 through a pin shaft 35, and the shaft hole at the other end is hinged to the shaft hole of the toggle joint 33 through the pin shaft 35.

In order to solve the problem of large working load of manual mold closing of a manual clamp and the problem of size difference of an individual structure of a workpiece combination self-adaptive to the same specification, the flaring-free guide pipe connecting piece extrusion forming device of the invention adopts a hydraulic power mold closing working mode through a clamping mechanism 3 as shown in figures 13, 14 and 15, the clamping mechanism 3 is arranged on a working platform 6 as shown in figure 2, the working characteristic is that a clamping arm 38 can rotate around the axis of a pin shaft 35, the working process is that after an operator places a workpiece combination 465 in an inner anvil mold cavity 462a of an anvil 462, a corresponding control button of a control panel 5 or a control button of a touch screen is pressed down, an electric control system controls a piston of a clamping oil cylinder 31 to move upwards, a moment is applied to the clamping arm 38 through a toggle joint 33 and a hinged connecting rod 34 which are rigidly connected with the clamping oil cylinder, the clamping arm 38 rotates around the pin shaft 35, and the automatic folding of the clamping arm 38 which is arranged in pairs and a half female mold 463, when a left half cavity 463a and a right half cavity 463b of a half cavity die 463 in a closed half cavity die 463 meet the blocking of an outer diameter outline entity of a pipe sleeve 4651 in a workpiece combination 465, a reaction force is generated to balance the clamping force of a clamping mechanism 3 and indirectly balance the thrust of a clamping oil cylinder 31 controlled by a system, and at the moment, the half cavity die 463 and the workpiece combination 465 are maintained in a clamping balance state, and because two halves of a clamping arm 38 and the half cavity die 463 which are configured in pair are in a coaxial state and a die closing gap X specially arranged on a combining surface of the half cavity die 463 is reserved, the position of the clamping balance state is not influenced by the structural size of the workpiece combination 465, the difference of the structural size of the workpiece combination 465 can be self-adapted in the range of the die closing gap X, and the half cavity die 463 can.

The stretching mechanism 4 comprises a stretching oil cylinder 41, a mounting bracket 42, an adapter rod 43A, a pulling pressure sensor 43, a hinge mechanism 44, a guide mechanism 45 and an expansion mechanism 46; the stretching oil cylinder 41 is arranged on the vertical mounting end surface of the mounting bracket 42 along the axis of the stretching oil cylinder in the horizontal direction; the mounting bracket 42 is provided with two mutually perpendicular mounting end surfaces which are respectively a horizontal mounting end surface and a vertical mounting end surface; the mounting bracket 42 is mounted on the upper surface of the work platform 6; one end of the adapter rod 43A is fixedly connected with a piston shaft of the stretching oil cylinder 41, and the other end of the adapter rod is fixedly connected with one end of the stretching pressure sensor 43; hinge mechanism 44 includes hinge head 441, latch 442, hinge rod 443; one end of a hinge head 441 of the hinge mechanism 44 is fixedly connected with the tension and pressure sensor 43; the other end of the hinge mechanism 44 is connected with the hinge hole end of the guide mechanism 45; the guide mechanism 45 includes a guide rail 451 and a hinge slider 452, the hinge slider 452 is mounted on the guide rail 451 and can slide along the axial direction of the guide rail 451 to perform a guiding function; the guide rail 451 is fixedly arranged on the working platform 6; the anvil die holder 47 is fixedly arranged on the working platform 6; the expanding mechanism 46 comprises an adapter 461, an anvil 462, a half-female die 463, a pull rod assembly 464 and a workpiece combination 465; adapter 461 is the coaxial hollow structure that the middle part is provided with the flange terminal surface, one end is provided with the external screw thread, one end is provided with the internal screw thread, anvil 462 is a cyclic annular part, one end sets up a cavity, the cavity inner space is greater than the boss that adapter 461 has the internal screw thread one end, the other end sets up a flange, the centre still is provided with anvil die cavity 462a that holds the work piece, adapter 461 external screw thread one end and articulated slider 452 fixed connection, the bulge of internal screw thread one end is located the cavity of anvil 462 one end, anvil 462 fixed mounting is on anvil die holder 47, the semi-cavity mould 463 installation of bulging mechanism 46 is fixed in the half bore of clamping arm 38, semi-cavity mould 463 is the symmetrical configuration, be providedClose to but less than halfEnd flanges for mounting to the clamping arms 38, andclose to but less than half of the mould cavityWhen the two half-female dies 463 are coaxially matched into a circle, a tiny gap is always reserved between the two half-female dies, and the tiny gap, namely a die closing gap X is the key for self-adapting to the dimension error of a workpiece when the workpiece is clamped by die closing; the pull rod assembly 464 includes a pull rod 4641. The pull rod 4641 penetrates through shaft holes of the lining 4642, the split ring 4643, the polyurethane sleeve 4644 and the like, and is fixedly connected to one end of the adapter 461, wherein the end of the adapter 461 is provided with internal threads.

In order to solve the defect of inaccurate extrusion force control, the stretching mechanism 4 in the forming machine adopts a mode of directly arranging a pulling pressure sensor 43 behind the output end of a piston shaft of a stretching oil cylinder 41 and in front of a pull rod to directly detect the extrusion force applied to a polyurethane sleeve 4644, and utilizes the output signal to realize closed-loop control on the extrusion force of the polyurethane sleeve 4644, so that the extrusion force is controlled more accurately and quickly. The working characteristics are that the output force from the piston shaft of the stretching oil cylinder 41 acts on the pull rod 4641 in the pull rod assembly 464 after being transmitted by various middle parts, the pull rod 4641 can slide in the guide hole of the lining 4642 along the axial direction, and the end cap at one end of the pull rod 4641 and the split ring 4643 apply pressure to the polyurethane sleeve 4644 sealed in the inner cavity of the conduit 4652 in the workpiece assembly 46, so that the polyurethane sleeve 4644 is deformed, and the conduit 4652 is extruded into the groove space of the inner wall of the conduit 4651. The working process of the clamping mechanism is that when the clamping mechanism 3 works and clamps a workpiece combination 465 to reach the hydraulic pressure set by a hydraulic system, the control system controls the action output of the stretching oil cylinder 41 and transmits the action output to a pull rod 4651 in a pull rod assembly 464 in the bulging mechanism 46 through an adapter rod 43A, a stretching pressure sensor 43, a hinge mechanism 44 and a guide mechanism 45 which are sequentially connected with the adapter rod, the stretching pressure sensor 43, the hinge mechanism 44 and the guide mechanism 45, wherein the hinge mechanism compensates the problem that the stretching oil cylinder 41, an anvil die seat 47 and the pull rod assembly 464 are not coaxial due to part machining and installation errors, the jamming or over-fast abrasion, part deformation and the like are avoided, the guide mechanism 45 guides the auxiliary pull rod 4651 during axial movement, and the problem that the small-sized pull rod is easy to break only by means of the guide of the small-sized pull. Wherein, the mounting bracket 42, the anvil seat 47 and the linear guide 452 are fixed on the upper surface of the working platform and kept stationary, so that during the working process, the cylinder body of the stretching cylinder 41 is kept stationary due to the fixation on the mounting bracket 42, the anvil 462 is also kept stationary due to the fixation on the anvil seat 47, the half-female die 463 is also kept stationary under the action of the clamping arm 38 of the clamping mechanism 3, because one end surface of the pad 4642 in the pull rod assembly 464 is blocked by the step in the cylindrical cavity 462b at the root of the die cavity 462a, the piston of the stretching cylinder 41 cannot move in the direction of the stretching cylinder 41 when being pulled back, the rear split ring 4643 next to the pad 4642 cannot move in the direction, and at this time, the piston of the stretching cylinder 41 drives the adapter rod 43A, the pulling pressure sensor 43, the hinge mechanism 44, the hinge slider 451, the adapter 461, the pull rod 4641, the front split ring 4643 and the like to move together, the deformable and compressible polyurethane sleeve 4644 is compressed and deformed towards the piston movement direction of the stretching cylinder 41 under the squeezing action of the end cap of the pull rod 4641 and the split ring 4643 abutting against the stepped surface of the pull rod 4641, and an inner expanding pressure is generated in the closed space of the conduit, because the inner cylindrical surface of the inner hole of the sleeve 4651 is provided with the annular groove 4653, one part of the radial outline ring surface is arranged in the anvil cavity 462a of the anvil 462, and the other part of the radial outline ring surface is arranged in the semi-female model cavity formed by the left semi-female cavity 463a and the right semi-female cavity 463b of the two semi-female molds 463, the cavities of the anvil 462 and the semi-female molds 463 realize the support of the sleeve 4651, and prevent the sleeve 4651 from being deformed, and the polyurethane sleeve 4644 is deformed and squeezes the conduit 4652 positioned at the annular groove 4653 of the sleeve 4651 to deform the conduit wall to be sunk into the annular groove 46.

Claims

1. A flaring-free conduit connection extrusion molding equipment comprises a cabinet, a hydraulic system, a clamping mechanism, a stretching mechanism, an operation panel and a working platform; the method is characterized in that: the hydraulic system provides power for driving oil cylinders of the clamping mechanism and the stretching mechanism; the stretching mechanism comprises a stretching driving mechanism and an expanding mechanism, the stretching driving mechanism provides power for the expanding mechanism, and the expanding mechanism comprises an adapter, a anvil die, a semi-female die and a pull rod assembly, wherein the center of the adapter, the anvil die, the semi-female die and the pull rod assembly are positioned on the same axis, and the drawing mechanism comprises a first drawing mechanism body and a second drawing mechanism body, wherein:

2. The flareless, conduit-joining, extrusion apparatus of claim 1, wherein: the draw bar assembly includes: the novel energy-saving adapter comprises a pull rod, a lining, two split rings, a polyurethane sleeve and an end cap, wherein one end of the pull rod is in driving connection with the adapter, the other end of the pull rod is provided with the end cap, and the first split ring, the polyurethane sleeve and the second split ring are in limiting sleeving connection between the lining and the end cap.

3. The flareless, conduit-joining, extrusion apparatus of claim 1, wherein: the die closing gap is 0.1-0.2 mm.

4. The flareless conduit coupling extrusion apparatus of claim 1, 2 or 3, wherein: the clamping mechanism comprises two clamping arms with the same structure, and each clamping arm is provided with a half hole for fixing the half female die; the two clamping arms are driven by the same clamping oil cylinder to form an equal-arm crank-link mechanism to realize opening and closing.

5. The flareless conduit coupling extrusion apparatus of claim 4, wherein: the equal-arm crank connecting rod mechanism comprises a clamping oil cylinder, an installation hanging frame, an elbow joint, a connecting rod, an installation seat and a clamping arm; the clamping oil cylinder is fixedly arranged on the mounting rack, and the mounting rack is fixed below the working platform; one end of the elbow joint is fixedly connected with a piston shaft of the clamping oil cylinder, and the other end of the elbow joint is provided with a shaft hole; the mounting seat is fixed below the working platform, and a shaft hole is formed in the side face of the mounting seat; each clamping arm is provided with two groups of shaft holes, and the two groups of shaft holes and the half holes are arranged in a triangular mode; the middle shaft hole of each clamping arm is hinged with the shaft hole of the mounting seat, and the lower shaft hole is fixedly connected with the same elbow joint through a connecting rod to form an equal-arm crank connecting rod mechanism.

6. The flareless conduit coupling extrusion apparatus of any one of claims 5, wherein: the stretching driving mechanism comprises a stretching oil cylinder, an adapter rod, a pulling pressure sensor, a hinge mechanism and a guide mechanism which are positioned on the same axis as the bulging mechanism and are sequentially connected; the hinge mechanism comprises a hinge head, a bolt and a hinge rod, and one end of the hinge head is fixedly connected with the pull pressure sensor; the guide mechanism comprises a guide rail fixed on the working platform and a hinged sliding block, the hinged sliding block slides along the axis direction of the guide rail, one end of the hinged sliding block is hinged with a hinged head of the hinged mechanism, and the other end of the hinged sliding block is connected with a pull rod of the pull rod assembly through an adapter.

7. The flareless, conduit-joining, extrusion apparatus of claim 6, wherein: the clamping mechanism and the stretching mechanism are not limited to be driven by an oil cylinder, and can also be driven by a power device which is driven by the linear motion output of an air cylinder and a motor.

8. The flareless, conduit-joining, extrusion apparatus of claim 6, wherein: the half-cavity die cavity formed by a pair of symmetrically matched half-cavity dies and the die cavity with the fourth-stage diameter of the anvil form a complete die cavity, and the complete die cavity is matched with the shape of a workpiece combination to realize positioning, clamping and supporting during extrusion.

9. The flareless, conduit-joining, extrusion apparatus of claim 6, wherein: the hinge mechanism of the stretching driving mechanism comprises: the hinge joint is articulated with hinge bar one end through a movable bolt, and the hinge bar other end is articulated through another bolt with articulated slider, and two bolts are removable plug structure.

10. The flareless, conduit-joining, extrusion apparatus of claim 6, wherein: the guide mechanisms are arranged in one group or two groups, and the two groups of guide mechanisms are symmetrically arranged on the working platform relative to the axis of the stretching mechanism.