CN109092927B

CN109092927B - Manufacturing method of EC (EC) connecting pipe or electronic expansion valve connecting pipe

Info

Publication number: CN109092927B
Application number: CN201810652397.0A
Authority: CN
Inventors: 张良; 段冰
Original assignee: Zhengjiang Changxing Heliang Intelligent Equipment Co Ltd
Current assignee: Zhengjiang Changxing Heliang Intelligent Equipment Co Ltd
Priority date: 2018-06-22
Filing date: 2018-06-22
Publication date: 2021-03-23
Anticipated expiration: 2038-06-22
Also published as: CN109092927A

Abstract

The invention relates to a manufacturing method of an EC (ethylene-propylene-diene monomer) connecting pipe or an electronic expansion valve connecting pipe, belonging to the technical field of pipe processing. The manufacturing method comprises the following steps: (1) synchronously straightening the front end parts of the N coil pipes into long pipe sections by utilizing N groups of straightening units arranged side by side, and synchronously cutting the long pipe sections into short pipes by utilizing N groups of chipless rotary cutting units arranged side by side; (2) and (3) cutting the short pipes cut by the N groups of the chipless rotary cutting units arranged side by side in a single time, and sequentially carrying out pipe end treatment on at least one end part of each short pipe according to the position arrangement sequence among the chipless rotary cutting units. The manufacturing method can effectively improve the automation degree of the manufacturing of the connecting pipe, can effectively improve the production efficiency and flexibility of the connecting pipe, and can be widely applied to the technical field of manufacturing of air conditioners, automobiles and the like.

Description

Manufacturing method of EC (EC) connecting pipe or electronic expansion valve connecting pipe

Technical Field

The invention relates to a processing and forming method of a pipe fitting, in particular to a manufacturing method of an EC (EC) connecting pipe or an electronic expansion valve connecting pipe.

Background

An electronic expansion valve is used as a main element of an air conditioner, and is a throttling element which can adjust the flow of refrigerant entering a refrigerating device according to a preset program.

According to the shape, the connecting pipe comprises a straight pipe-shaped connecting pipe and a bent pipe-shaped connecting pipe, such as an electronic expansion valve disclosed in the patent document with the publication number of CN207111959U, and as shown in the attached figure 3, the connecting pipe comprises a straight pipe-shaped connecting pipe 102 and a bent pipe-shaped connecting pipe 103, and the outer end parts of the two connecting pipes are both in flaring end structures; as shown in fig. 2 of the accompanying drawings, the connecting pipe of the electronic expansion valve disclosed in patent document CN103836211A includes a straight pipe-shaped connecting pipe 13 and a bent pipe-shaped connecting pipe 14, wherein an inner end of the connecting pipe 13 is of a flared end structure, and an inner end of the connecting pipe 14 is of a tapered end structure; for some connecting pipes, one of the two ends of the connecting pipe is of a flaring end structure, and the other end of the connecting pipe is of a necking end structure, or both the two ends of the connecting pipe are of flaring end structures.

In addition, the four-way valve is used as a main element of a refrigeration device, is used for controlling the switching between a heat cycle and a refrigeration cycle, and is provided with an E connecting pipe, an S connecting pipe and a C connecting pipe, and the specific structure of the four-way valve is disclosed in patent documents with the publication number of CN101324277A, the publication number of CN201391635Y and the like.

When manufacturing the above-mentioned connecting pipes with various structures, a cutting device is usually adopted to cut a long pipe into fixed-length pipe sections, and then the fixed-length pipe sections are conveyed to a pipe section processing unit to be fed so as to process the pipe end of more than one of the two ends according to a predetermined structure; for a bent pipe-shaped connecting pipe in the electronic expansion valve, the pipe section after pipe end treatment needs to be conveyed to a pipe bending machine for pipe bending treatment, so that the automation degree of the whole treatment process is low, and the processing efficiency is low.

Disclosure of Invention

The invention mainly aims to provide a manufacturing method of an EC connecting pipe or an electronic expansion valve connecting pipe, which is used for improving the production automation degree of the connecting pipe and improving the production efficiency of the connecting pipe.

In order to achieve the above main object, the present invention provides a manufacturing method comprising the steps of:

a pipe section feeding step, namely synchronously straightening the front ends of N coil pipes into a long pipe section by utilizing N groups of straightening units arranged side by side, and synchronously cutting the long pipe section into short pipes by utilizing N groups of chipless rotary cutting units arranged side by side;

and a pipe end processing step, namely, sequentially carrying out pipe end processing on at least one end of each short pipe by the short pipes cut by the N groups of the chipless rotary cutting units arranged side by side in a single time according to the position arrangement sequence among the chipless rotary cutting units.

The long pipe is cut into the short pipe sections with preset length and cleanness by using a chipless rotary cutting mode, so that the generation of cutting scraps is effectively reduced to deteriorate the production and manufacturing environment, the automation degree and the production efficiency of a production line are improved, meanwhile, the preset length of the short pipe sections can be adjusted in real time according to the production working condition, and the flexibility of the production line is effectively improved; by adopting more than two groups of pipe section feeding units arranged side by side to be matched with the pipe end processing unit in parallel, the difference of the processing speed between the feeding step and the processing and forming step can be effectively matched, and the production efficiency is improved.

After the pipe end processing step, the pipe bending unit is used for performing pipe bending processing on the short pipe subjected to the pipe end processing to obtain a bent pipe-shaped electronic expansion valve connecting pipe.

More specifically, before the short pipe is subjected to pipe bending treatment, the short pipe subjected to pipe end treatment is subjected to pipe end positioning treatment. The bending progress is effectively improved.

The preferable proposal is that the pipe bending unit comprises a pipe bending machine head, a mandrel unit and a discharging unit; the pipe bending machine head comprises a clamping die, a round die and a swing arm; the mandrel unit comprises a mandrel and a mandrel driving mechanism for driving the mandrel to extend into or withdraw from the pipe section; the discharging unit comprises a pushing sleeve sleeved outside the core rod and a pushing driving device used for driving the pushing sleeve to reciprocate along the axial direction of the core rod. The discharging unit is arranged to comprise a material pushing sleeve sleeved outside the core rod, so that the discharging process is convenient to realize, and the integral structure of the equipment can be simplified.

The more preferable scheme is that a guide plate is fixedly arranged on the fixed end part of the swing arm, the guide plate is vertically positioned between the circular die and the swing arm, and the guide plate comprises an inclined base plate with an avoidance opening matched with the mounting seat of the circular die; when the clamping die cavity of the clamping die is axially arranged along the axial direction of the core rod, the inclined substrate is obliquely arranged downwards along the direction of the round die departing from the core rod driving mechanism, and flanges are fixedly arranged on the edge part of the inclined substrate facing the clamping die and the edge part of the inclined substrate facing the core rod driving mechanism. By additionally arranging the material guide plate, the pipe section can be prevented from falling onto the swing arm to interfere the clamping action of the clamping die or falling into a gap between the swing arm and the headstock to interfere the subsequent pipe bending operation during the discharging process, and the reliable operation of the whole automatic treatment process is effectively ensured.

Another preferred embodiment is that the axes of the rotating main shafts of the N groups of chipless rotary cutting units are coplanar and the axial intervals are all first intervals, and the step of sequentially performing pipe end treatment on at least one end of each short pipe according to the position arrangement sequence among the chipless rotary cutting units comprises:

a rotation step, namely synchronously rotating N sections of short pipes by a preset angle around the same rotation axis by using a first pipe moving manipulator unit according to the position arrangement sequence of the N groups of chipless rotary cutting units until the synchronously cut N sections of short pipes are sequentially arranged along a first transverse direction;

a positioning step, namely synchronously placing the N sections of the rotated short pipes on a fixed groove seat, wherein the fixed groove seat is provided with N +1 positioning material supporting grooves which are sequentially arranged along a first transverse direction;

step by step, grabbing the short pipe sections arranged at the front end by using a second pipe moving manipulator unit for pipe end processing, synchronously lifting the rest short pipes to a position separating and supporting trough in the vertical direction by using N displacement supporting troughs on a displacement trough seat, synchronously stepping the short pipes by a first distance towards the material moving direction, and synchronously descending the short pipes to be placed on a fixed trough seat;

and repeating the stepping step until the short pipe positioned on the fixed groove seat is completely grabbed.

By rotating the tube end and then transferring it in a stepwise manner to the tube end processing unit, the spatial stepping of the apparatus can be optimized efficiently.

More preferably, the predetermined angle is 90 degrees.

Another preferred scheme is that the fixed slot seat comprises two fixed slot plates which are arranged in parallel, the shifting slot seat comprises side slot plates which are positioned on two outer sides of the two fixed slot plates, the length direction of the slot plates is arranged along the material shifting direction, the surfaces of the slot plates are arranged along the vertical direction, and the V-shaped positioning slots arranged on the upper side surfaces of the slot plates form the part for supporting the slot. The groove seat is composed of more than two groove plates, so that when more than two points of support are provided for the workpiece, a gap can be arranged between the groove plates, and the workpiece can be conveniently placed in the supporting groove and grabbed from the supporting groove by the clamping claw.

The step driving unit comprises a sliding plate seat, a driving device for driving the sliding plate seat to reciprocate along the material moving direction, a lifting plate which can be vertically movably arranged on the sliding plate seat, and a driving device for driving the lifting plate to lift along the vertical direction; the shifting groove seat is arranged on the lifting plate.

The first pipe moving manipulator unit comprises a mounting seat, N material clamping claws which are arranged on the mounting seat at a first interval, a first transferring sliding seat which is driven by a transferring driving device to move along the material moving direction, a lifting mechanism which drives the mounting seat to lift relative to the first transferring sliding seat, and a rotating mechanism which drives the mounting seat to rotate relative to the first transferring sliding seat around a vertical shaft. Based on the manipulator with the structural design, the first pipe moving manipulator unit can fix the pipe sections cut by more than two rotary cutting units on the groove seat at one time.

Drawings

FIG. 1 is a flow chart of the operation of an embodiment of the present invention;

FIG. 2 is a schematic structural view of a pipe section cut out in the pipe section feeding step according to the embodiment of the present invention;

FIG. 3 is a schematic view of a pipe section after being processed at a pipe end according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a pipe section after pipe bending according to an embodiment of the present invention;

FIG. 5 is a perspective view of a manufacturing line used to implement an embodiment of the present invention;

FIG. 6 is a block diagram of a schematic configuration of a manufacturing line used to implement an embodiment of the present invention;

FIG. 7 is an enlarged view of a portion A of FIG. 5;

FIG. 8 is an enlarged view of portion B of FIG. 5;

FIG. 9 is an enlarged view of portion C of FIG. 5;

figure 10 is a perspective view of a die clamping device on a tube end processing unit in a production line for carrying out an embodiment of the present invention;

figure 11 is a perspective view of a pipe end spinning unit in a production line used to practice embodiments of the present invention, with die clamping means omitted;

figure 12 is a perspective view of a pipe end straight punch unit in a production line for carrying out embodiments of the present invention, with die clamping means omitted;

FIG. 13 is an enlarged view of portion D of FIG. 5;

FIG. 14 is an enlarged view of E in FIG. 5;

FIG. 15 is a schematic view of a pipe bending unit in a manufacturing line for carrying out an embodiment of the invention in a state where a clamp die is opened after pipe bending is completed;

FIG. 16 is a schematic view of a pipe bending unit in a production line for carrying out an embodiment of the invention, in a discharge state;

FIG. 17 is an enlarged view of portion F of FIG. 15;

FIG. 18 is a perspective view of a stepped dispensing unit in a manufacturing line for use in practicing embodiments of the present invention in a first dispensing state;

FIG. 19 is a perspective view of a stepped material distribution unit in a production line for use in practicing embodiments of the present invention in a second state of material distribution;

figure 20 is a perspective view of a pipe-moving robot unit in a manufacturing line for use in carrying out an embodiment of the present invention.

Detailed Description

The invention is further illustrated by the following examples and figures.

Examples

In the following embodiments, the present invention is exemplified by manufacturing an elbow type nozzle on an electronic expansion valve.

Referring to fig. 1, the method for manufacturing the electronic expansion valve adapter of the present invention includes a pipe section feeding step S1, a pipe end processing step S2, and a pipe bending step S3. The manufacturing method is performed using a manufacturing line as shown in fig. 5 to 20 to manufacture a bent tube-like structure in an electronic expansion valve.

Referring to fig. 5 and 6, the manufacturing apparatus 1 of the present invention includes a control unit, a frame 100, a pipe section feeding system 11 mounted on the frame 100, a processing and forming system 15, a material moving system for feeding the pipe sections cut by the pipe section feeding system 11 to the processing and forming system 15 according to a predetermined program, and an aggregate unit 19 for collecting the connecting pipes processed by the processing and forming system 15. The control unit comprises a processor, a memory and a control panel 101, wherein the control panel 101 is used for receiving a control instruction input by an operator, the processor executes a program corresponding to the control instruction in the memory, and the processor sequentially carries out pipe cutting, transferring, processing and forming processing so as to manufacture a desired electronic expansion valve connecting pipe.

The pipe section feeding system 11 includes two pipe section feeding units arranged side by side, namely a pipe section feeding unit 12 and a pipe section feeding unit 13, the pipe section feeding unit 12 includes a long pipe feeding unit 121 and a chipless rotary cutting unit 122 for cutting the long pipe material to be fed into a fixed length pipe section, and the pipe section feeding unit 13 includes a long pipe feeding unit 131 and a chipless rotary cutting unit 132 for cutting the long pipe material to be fed into a fixed length pipe section.

The long

pipe feeding units

121 and 131 respectively include a coil mounting frame (not shown), pipe straightening units 21 and 23, and

feeding units

22 and 24 in sequence along the traveling direction of long pipe feeding, i.e. along the positive direction of the X axis in the figure. The coil pipe material arranged on the coil pipe mounting frame is straightened into a straight pipe material through the extrusion of a plurality of groups of straightening rollers on the pipe material straightening unit. In the present embodiment, the feeding

units

24 and 22 are symmetrically arranged with respect to a first plane, which is parallel to plane OXZ, and feed the corresponding chipless rotary cutting units synchronously during feeding.

As shown in fig. 5 and 7, the feeding unit 22 includes two guide rods 221 arranged along the X-axis direction, an up-and-down opening-and-closing type clamping die 222 slidably mounted on the guide rods 221, and a linear displacement output device 223 driving the clamping die 222 to reciprocate along the guide rods 221. The feeding unit 24 includes two guide rods 241 arranged along the X-axis direction, an up-and-down opening-closing type clamping die 242 slidably mounted on the guide rods 241, and a linear displacement output device 243 for driving the clamping die 242 to reciprocate along the guide rods 241.

For the two feeding units, the opening and closing driving device of the clamping die and the sliding driving device sliding along the guide rod can share the same set of driving device, and the driving device can also be independently adopted for driving. In this embodiment, the clamping die 222 and the clamping die 242 share the same set of opening and closing driving device and the same set of transfer driving device. As shown in fig. 7, the mold clamping opening and closing driving device includes a slide base 27 fixed to a slide block cooperating with a guide bar, two support blocks 281 fixed to the slide base 27, and an opening and closing cylinder 25 supported and fixed to the support blocks 281 by a cross plate 282. The lower clamping dies of the two clamping dies are fixed on the sliding seat 27, and the upper clamping dies are fixed on the piston rods of the opening and closing air cylinders 25 through the clamping die

seats

283 and 26, so that the two clamping dies are synchronously driven to be synchronously opened and closed, and two straightened long pipes are synchronously clamped or released. The transfer driving device comprises a servo motor and a feed screw nut mechanism in transmission connection with a rotor shaft of the servo motor, and a feed screw nut of the feed screw nut mechanism is fixedly connected with the sliding seat 27. The two feeding clamping dies are synchronously driven based on the same set of conveying driving device and opening and closing driving device, so that the using amount of parts can be reduced, and straightened long pipe materials can be synchronously supplied to the two chipless rotary cutting units.

As shown in fig. 5, 6 and 9, the rotating spindles of the chipless rotary cutting unit 122 and the chipless rotary cutting unit 132 are arranged along the X-axis direction, and the distance between the rotating spindles is a first distance, and a surplus pipe clamping unit 29 is disposed on one side of the rotating spindle mounting seat adjacent to the feeding unit. In this embodiment, the structure of the remaining tube clamping unit 29 is the same as that of the feeding unit, so as to synchronously clamp the two long tubes during the cutting process and open the two long tubes during the feeding process of the feeding unit, so as to support and guide the two long tubes to smoothly enter the inner hole of the rotary spindle of the chipless rotary cutting unit. And cutting clamping dies 1220 and 1320 which are opened and closed in the Y-axis direction are fixedly arranged on one side of the rotating main shaft, which is far away from the residual pipe part clamping die unit 29, and the cutting clamping dies 1220 and 1320 are respectively composed of two movable clamping dies which synchronously move in opposite directions.

As shown in fig. 5 and 6, the processing and forming system 15 sequentially includes a pipe end processing unit 16, a pipe positioning unit 17, and a pipe bending unit 18 along the traveling direction of the pipe section, wherein the pipe end processing unit sequentially includes a pipe end rotary punching unit 161 and a pipe end straight punching unit 162 along the traveling direction of the pipe section processing process.

Referring to fig. 10 and 11, the pipe end spinning unit 161 includes a pipe segment clamping die 31, and a first pipe end processing head 32 and a second pipe end processing head 33 which are located on both sides of the pipe segment clamping die 31 and have processing sides facing the pipe segment clamping die 31, and the rotation main shafts of the first pipe end processing head 32 and the second pipe end processing head 33 are arranged along the Y-axis direction. The pipe section clamping die 31 comprises a sliding groove seat 310 fixed on the machine frame 100, a left clamping die seat 311 and a right clamping die seat 312 which are slidably mounted on the sliding groove seat 310 along the X-axis direction, a left clamping die 313 fixed on the left clamping die seat 311, a right clamping die 314 fixed on the right clamping die seat 312, a wedge-shaped push block arranged in a sliding groove cavity 3100 of the sliding groove seat 310, and a clamping die driver 315 for driving the wedge-shaped push block to reciprocate along the Z-axis direction. The mold clamping driver 315 may be a linear displacement output device such as a cylinder, a linear motor, or the like, and the cylinder is specifically selected in this embodiment.

The sliding groove seat 310 is provided with a cross sliding groove 3100 arranged along the X-axis direction, and the left and right die clamping seats are slidably mounted on the sliding groove seat 310 through a cross sliding block matched with the sliding groove 3100. Two pushing grooves which are parallel to the XOZ plane and form a V-shaped structure are arranged on the wedge-shaped pushing block; and the left and right die clamping bases are provided with sliding blocks matched with the pushing grooves, so that in the process of pushing the wedge-shaped pushing block to reciprocate along the Z axial direction through the die clamping driver 315, the left and right die clamping bases are synchronously pushed to move along opposite directions in the Y axial direction, and the pipe fitting is clamped by closing or released by opening.

The first pipe end processing machine head 32 is a flaring device, the second pipe end processing machine head 33 is a necking device, in the pipe end processing process, the flaring processing and the necking processing are simultaneously carried out on the two ends of the pipe section clamped on the pipe section clamping die 31 through the flaring die 320 and the necking die 330, and chamfering blades synchronously driven by the rotating main shafts of the flaring die 320 and the necking die 330 are arranged beside the sides of the flaring die 320 and the necking die 330, so that the two ends of the pipe section are synchronously chamfered in the rotary punching process.

As shown in fig. 12, the pipe-end direct punching unit 162 includes a pipe segment clamping die 31, and a third pipe-end processing head 34 and a fourth pipe-end processing head 35 which are located on both sides of the pipe segment clamping die 31 and have processing sides facing the pipe segment clamping die 31, and driving main shafts of the third pipe-end processing head 34 and the fourth pipe-end processing head 35 are arranged along the Y-axis direction. The third pipe end processing head 34 and the fourth pipe end processing head 35 are both flaring devices, and in the pipe end processing process, the flaring processing is simultaneously carried out on both ends of the pipe section clamped on the pipe section clamping die 31 through the flaring die 340 and the flaring die 350. And configuring the configuration and the number of the flaring machine heads and the necking machine heads of the plurality of sub-units in the pipe end processing unit according to actual requirements.

As shown in fig. 13, the pipe section positioning unit 17 includes a support 40, a material holding groove 41, a positioning rod 42 disposed on one side of the material holding groove 41 in the groove length direction, a material pushing rod 43 disposed on the other side of the groove length, and a material pushing driving device 44 for pushing the material pushing rod 43 to reciprocate in the Y axis direction. The material pushing driving device can select linear displacement output devices such as a linear motor, an air cylinder and an oil cylinder, and in the embodiment, the material pushing oil cylinder is specifically selected.

The material supporting groove 41 is composed of two groove plates 411 provided with V-shaped positioning grooves 410, the two groove plates 411 are spaced at a certain distance in the Y-axis direction, the groove plates 411 are fixed on the rack 100 through a support 40, and the positioning rod 42 is adjustably mounted on the support 40 in the Y-axis direction. On the bracket 40, a guide rod mechanism composed of a guide rod 47 and a sliding bearing 45 is fixedly arranged at two sides of the pushing drive device 44, a connecting plate 46 is fixedly arranged at the front end of the guide rod 47, the pushing rod 43 is fixed on the front end surface of the connecting plate 46, the stator of the pushing drive device 44 is fixed on the bracket 40, and the mover is fixedly connected with the connecting plate 46, so that the end surface of the pipe section arranged in the positioning groove 410 is pushed to abut against the positioning rod 42, and the positioning of the pipe section in the Y-axis direction is realized. Wherein the positioning groove 410 is arranged in the Z-axis direction near the groove side of the tube-end processing unit 16, and the other groove side is arranged obliquely to facilitate the taking of the material after the tube segment is positioned. A material detection sensor for detecting whether the material exists in the positioning groove 410 is installed beside the side of the groove plate 411, wherein the material detection sensor can be a proximity switch, a shielding type photoelectric sensor or a diffuse reflection type photoelectric sensor, and in the embodiment, a laser sensor is specifically selected; the material detecting sensor outputs a detecting signal to the control unit, and the control unit controls the pipe section positioning unit 17 to position the pipe material according to whether the material exists or not, and is used as one of judging signals for controlling the second pipe moving manipulator unit to take the material from the material supporting groove.

Referring to fig. 14 to 17, the tube bending unit 18 includes a tube bending head 51, a mandrel unit 52, a discharging unit 53, and a guide plate 6. The pipe bending machine head 51 comprises a clamping die 510, a round die 511, a guide die 512 and a swing arm 513. The swing arm 513 and the circular die 511 are driven by the same driving main shaft to synchronously rotate around the axis of the main shaft; the clamp mold 510 is driven by a clamp mold driving mechanism 5101, is mounted on the swing arm 513 so as to be reciprocated between a pipe clamping position and a pipe releasing position, and clamps a pipe to be bent or releases the pipe after the pipe bending is completed by cooperating with the circular mold 511.

The mandrel unit 52 includes a holder 520, a mandrel 521 arranged in the Y-axis direction, and a mandrel driving mechanism 522 for driving the mandrel 521 to extend into or retract from the pipe segment. The mandrel driving mechanism 522 may be a linear displacement output device such as a linear motor, an air cylinder, and an oil cylinder, and in this embodiment, a mandrel oil cylinder is specifically used.

The discharging unit 53 includes a bracket 530, a pushing sleeve 531 sleeved outside the core rod 521, and a pushing driving device 532 for driving the pushing sleeve 531 to reciprocate along the Y axis. The material pushing driving device can select linear displacement output devices such as a linear motor, an air cylinder and an oil cylinder, and specifically selects a material pushing oil cylinder in the embodiment. On the bracket 530, a guide rod mechanism composed of a guide rod 533 and a sliding bearing 534 is fixedly arranged at two sides of the pushing drive device 532, a connecting plate 535 is fixedly arranged at the front end of the guide rod 533, a pushing sleeve 531 is fixed on the front end surface of the connecting plate 535, a stator of the pushing drive device 532 is fixed on the bracket 530, and a mover is fixedly connected with the connecting plate 535.

A support base is fixed in front of the discharging unit 53, and a guide pipe 55 arranged along the Y-axis direction is fixed on the support base. In the working process, the mandrel driving mechanism 522 pushes and pulls the mandrel 521 which sequentially passes through the material pushing sleeve 531 and the guide pipe 55 to extend into the pipe section to be bent, so as to perform auxiliary bending on the pipe section to be bent. After the pipe bending process is completed, the pushing material driving device 532 drives the pushing material sleeve 531 to move along the axial direction of the core rod 521 so as to push the pipe material out of the end of the core rod 521 and drop the pipe material onto the material guiding plate 6, and slide along the surface of the inclined base plate 60 into the material collecting unit 19 to be collected. In this embodiment, the collecting unit 19 includes a material guide plate 190 as shown in fig. 14 and a movable collecting basket disposed below the material guide plate 190.

The guide plate 6 is fixedly arranged on the fixed end part of the swing arm 513 between the circular die 511 and the swing arm 513 in the Z-axis direction, and the guide plate 6 comprises an inclined base plate 60 with an avoidance port 63 matched with the mounting seat 5110 of the circular die 511. When the clamping die 510 swings along with the swing arm 513 to the position that the clamping die cavity is axially arranged along the axial direction of the mandrel 531, the clamping die cavity is axially parallel to the guide die cavity of the guide die 512 at the moment and is axially arranged along the Y direction, namely, the clamping die cavity and the guide die cavity are both positioned at the position to be used for clamping the pipe material before the pipe bending; at this time, in the negative direction of the Y axis, that is, in the direction of the circular mold 511 away from the mandrel driving mechanism 522, the inclined substrate 60 is arranged to be inclined downward, so that the adapter tube pushed down by the material pushing sleeve 531 can slide along the inclined substrate 60 and fall into the material collecting unit 19, and the inclined substrate 60 is fixedly provided with a flange 61 on the edge portion facing the clamping mold 510 and a flange 62 on the edge portion facing the mandrel driving mechanism 522, so as to stop and guide the sliding process of the adapter tube on the inclined substrate 60 and slide according to a desired path.

Referring to fig. 5, 6, 8 and 18 to 20, the material moving system includes a stepping material distributing unit 14 and a pipe moving manipulator unit 10. The step material distributing unit 14 includes a bracket 70, two middle slot plates 71, side slot plates 72 respectively disposed at both sides of the middle slot plates 71, and a step driving unit. The pipe transfer robot unit 10 includes a first pipe transfer robot unit 8 for transferring the pipe segments from the clamping dies 1220 and 1320 of the chipless rotary cutting unit to the step-by-step material distribution unit 14, and a second pipe transfer robot unit 9 for transferring the pipe segments from the step-by-step material distribution unit 14 to the processing system and sequentially transferring the pipe segments among the processing units in the processing system in order of the processing steps.

In the step-by-step material distributing unit 14, a first material supporting groove 710, a second material supporting groove 711 and a third material supporting groove 712 which are arranged at equal intervals along the X-axis direction at the first interval are arranged on the middle trough plate 71, a fourth material supporting groove 720 and a fifth material supporting groove 721 which are arranged at the first interval along the Y-axis direction are arranged on the side trough plate 72, and the groove lengths of the five material supporting grooves are arranged along the Y-axis direction and are all in a V-shaped positioning groove structure; in the present embodiment, the X axis constitutes the material moving direction of the step material distributing unit 14.

The step driving unit includes a lifting driving unit 73 for driving the two side groove plates 72 to reciprocate between the low position and the high position in the Z-axis direction in synchronization, and a traveling driving unit 74 for driving the two side groove plates 72 to reciprocate between the front position and the rear position in the X-axis direction.

In the present embodiment, the travel driving unit 74 includes a slide plate holder 740 and linear displacement output devices 741, the slide plate holder 740 is slidably mounted on the support 70 along the X-axis direction by a rail-slide mechanism, and the stators of the linear displacement output devices 741 are fixed on the support 70 and are two in number, and are used for pushing the slide plate holder 740 to reciprocate along the X-axis direction. The lifting driving unit 73 includes a lifting plate 730 slidably mounted on the sliding plate base 740 along the Z-axis direction and a linear displacement output device 731 for pushing the lifting plate 730 to reciprocate along the Z-axis direction, the two side slot plates 72 are fixed on the lifting plate 730, and the middle slot plate 71 is fixed on the bracket 70. The linear

displacement output devices

741 and 731 can be linear motors, air cylinders, oil cylinders, and the like, and in this embodiment, oil cylinders are specifically selected.

By the combined driving of the lifting driving unit 73 and the advancing driving unit 74, that is, the driving side trough plate 72 moves in two-dimensional space in the XOZ plane relative to the middle trough plate, when the side trough plate 72 is located at the aforementioned low position, the upper plate surface of the side trough plate is lower than the lower edges of the pipe sections lifted on the first material supporting trough 710, the second material supporting trough 711 and the third material supporting trough 712; when the side trough plate 72 is located at the high position, the lower edges of the upper pipe sections of the fourth material supporting trough 720 and the fifth material supporting trough 721 are higher than the upper plate surface of the middle trough plate 71; when the side chute plate 72 is located at the aforementioned front position, the fifth stock accommodating groove 721 is located at the third stock accommodating groove 712 in the X-axis direction; when the side groove plate 72 is located at the aforementioned rear position, the fifth stock groove 721 is located at the second stock groove 711 in the X-axis direction.

A tube section positioning mechanism 74 is disposed beside the third material supporting groove 712, and includes a support 740, a positioning rod 742 disposed on one side of the third material supporting groove 712 in the groove length direction, a material pushing rod 743 disposed on the other side of the groove length, and a material pushing driving device 744 for pushing the material pushing rod 743 to reciprocate along the Y-axis direction. The pushing driving device 744 can be a linear displacement output device such as a linear motor, an air cylinder, and an oil cylinder, and is specifically selected in this embodiment.

The positioning rod 742 is attached to the holder 740 so as to be adjustable in position in the Y-axis direction. On the bracket 740, a guide rod mechanism composed of a guide rod 747 and a sliding bearing 745 is fixedly arranged at two sides of the pushing drive device 744, a connecting plate 746 is fixedly arranged at the front end of the guide rod 747, the pushing rod 743 is fixed on the front end face of the connecting plate 746, the stator of the pushing drive device 744 is fixed on the bracket 740, and the mover is fixedly connected with the connecting plate 746, so as to push the end face of the pipe section arranged in the third positioning slot 712 to abut against the positioning rod 742, thereby realizing the positioning of the pipe section in the Y-axis direction. A material detecting sensor 7120 for detecting whether a tube material is present in the third material supporting groove 712 is installed beside the third material supporting groove, and the material detecting sensor may be a proximity switch, a blocking type photoelectric sensor or a diffuse reflection type photoelectric sensor, and in this embodiment, a laser sensor is specifically used. The oil detecting sensor outputs a detecting signal to the control unit, controls the pipe segment positioning mechanism 74 to start to position when the detecting signal indicates that a pipe exists in the third material supporting groove 712, and controls one of a judging signal for controlling the first pipe moving manipulator unit to convey the pipe to the stepping material distributing unit and a judging signal for controlling the second pipe moving manipulator unit to take the pipe from the third material supporting groove 712.

Referring to fig. 8 and 20, the first pipe transfer robot unit 8 includes a mounting base 80, a first clamping claw 81 and a second clamping claw 82 mounted on the mounting base 80 at a first interval, a transfer slide 84 driven by a transfer driving device 83 to reciprocate in the X-axis direction, an elevating mechanism 85 for elevating and lowering the mounting base 80 relative to the transfer slide 84, and a rotating mechanism 86 for rotating the mounting base 80 relative to the transfer slide 84 about a vertical axis. In this embodiment, the rotating mechanism 86 is a rotating cylinder, and the lifting mechanism 85 is a telescopic cylinder; the transfer driving device 83 selects a servo motor 830 and a gear-rack mechanism 831, the servo motor 830 is fixed on the transfer slide carriage 84, the gear is coaxially fixed on the rotor shaft of the servo motor 830, the rack is fixed on the supporting beam 800, the supporting beam 800 is fixedly provided with an I-shaped guide rail arranged along the X-axis direction, the transfer slide carriage 84 is fixedly provided with an I-shaped slide block matched with the I-shaped guide rail, so that the transfer slide carriage 84 can be suspended on the supporting beam 800 in a reciprocating sliding manner along the X-axis direction. And a transverse position adjustable mechanism 87 is installed between the rotating mechanism 86 and the lifting mechanism 85, and the transverse position adjustable mechanism 87 comprises a linear guide rail sliding block mechanism and a quick release mechanism for locking the relative position between the guide rail and the sliding block, so that the position of the mounting seat 80 in the transverse direction is finely adjusted in the installation process, and the position of the stepping material distributing unit 14 is better matched.

In the working process, the two

material clamping claws

81 and 82 with the first distance are used for grabbing two fixed-length pipe sections from the pipe cutting clamp dies 1220 and 1320 with the first distance from the axis, the pipe sections are driven by the lifting mechanism 85 to rise to a certain height, then the pipe sections are driven by the rotating mechanism 86 to rotate 90 degrees to the length direction of the fixed-length pipe sections and are arranged along the Y axial direction, the pipe sections are driven by the transfer driving device 83 to move along the X axial direction to be positioned right above the first material supporting groove 710 and the second material supporting groove 711 respectively, the pipe sections are driven by the lifting mechanism 85 to descend to be positioned in the two material supporting grooves, and then the two material clamping claws are opened to place the two pipe sections into the first material supporting groove 710 and the second material supporting groove 711. Then, the two side groove plates 72 raise the two fixed length pipe sections in the Z-axis direction to a position where the lower edges of the pipe sections are higher than the upper plate surface of the middle groove plate 71 under the lifting driving of the linear displacement output device 731, so as to move forward along the X-axis direction by the first distance under the forward driving of the linear displacement output device 741, and then the two fixed length pipe sections are placed in the second stock groove 711 and the third stock groove 712 under the lowering driving of the linear displacement output device 731, thereby realizing the step-by-step movement of the fixed length pipe sections.

The second tube moving manipulator unit 9 comprises a synchronous transfer sliding seat 95 which is driven by the transfer driving device 90 to reciprocate on a supporting beam 900 along the X-axis direction, and four

manipulators

91, 92, 93 and 94 which are fixedly arranged on the synchronous transfer sliding seat and respectively correspond to the tube end rotary punching unit 161, the tube end straight punching unit 162, the tube section positioning unit 17 and the tube bending unit, namely the number of the manipulators is equal to the number of processing units in the processing and forming system; the four manipulators have the same structure, and the manipulator 91 is taken as an example to illustrate the structure, the manipulator 91 comprises a material clamping claw 910, a mounting seat 911 fixedly arranged on the synchronous transfer sliding seat 95, and a lifting mechanism 912 for driving the material clamping claw 910 to lift relative to the mounting seat 911. The pipe sections processed by the current unit are grabbed from the third material supporting groove 712, the pipe end rotary punching clamping die, the pipe end straight punching clamping die and the V-shaped positioning groove 410, ascend, synchronously move forwards along the X axis in the positive direction, and descend, so that the four pipe sections are synchronously placed between the end rotary punching clamping die, the pipe end straight punching clamping die, the V-shaped positioning groove 410 and the round die and the clamping die of the pipe bending unit 18 for processing of the next procedure. The material transfer system is used for alternately transferring the pipe sections cut by the pipe section supply units arranged side by side to the pipe end processing unit 16, and sequentially and synchronously transferring the pipe sections in each processing unit of the processing and forming system 15 according to the processing procedure. In the embodiment, the lifting of each manipulator can be independently controlled, and only the reciprocating movement along the X-axis is synchronous control; of course, the lifting of the four manipulators can be synchronously controlled. In this embodiment, the support beams 800, 900 are the same support beam.

The manufacturing method comprises the following specific steps:

a pipe section feeding step S1, wherein N groups of straightening units arranged side by side are used for synchronously straightening the front ends of the N coil pipes into long pipe sections, and then N groups of chipless rotary cutting units arranged side by side are used for synchronously cutting the long pipe sections into short pipes; the structure is obtained as a short tube 01 as shown in figure 2.

In this embodiment, N is 2, that is, two coils of pipe materials are straightened into straight pipe materials by using a plurality of sets of straightening rollers on the pipe material straightening units 21 and 23 arranged side by side, and then the chipless

rotary cutting units

122 and 132 cut two straight pipe materials correspondingly under the feeding of the feeding

units

22 and 24, and a short pipe is synchronously cut out each time.

And a pipe end processing step S2, wherein the short pipes cut by the N groups of the chipless rotary cutting units arranged side by side in a single time are subjected to pipe end processing on at least one end of each short pipe in sequence according to the position arrangement sequence among the chipless rotary cutting units. In this embodiment, after both ends of the short pipe 01 shown in fig. 2 are subjected to pipe end processing, the short pipe 02 shown in fig. 3 is obtained. Before the pipe end processing step is sequentially performed on at least one end portion of each short pipe, N short pipes in the order of position arrangement between the chipless rotary cutting units are rotated by a predetermined angle around the same vertical axis, in this embodiment, completely by the first pipe moving manipulator unit, and rotated by 90 degrees. The method specifically comprises the following steps:

and a rotation step, namely, according to the position arrangement sequence of the N groups of chipless rotary cutting units, synchronously rotating the N sections of short pipes by a preset angle around the same rotation axis by using the first pipe moving manipulator unit until the N sections of short pipes cut synchronously are sequentially arranged along the first transverse direction.

In this embodiment, the predetermined angle is 90 degrees, so that the short pipes originally arranged along the X-axis are rotated and then arranged along the Y-axis, and then rotated from the direction of axial arrangement along the chipless

rotary cutting units

132, 122 to the axial arrangement along the pipe section processing unit, so that the size of the two sets of chipless rotary cutting units in the Y-axis is approximately matched with the size of the pipe end processing unit in the axial direction, so as to better occupy the ground position, i.e. the Y-axis constitutes the first transverse direction in this embodiment.

And a positioning step, namely synchronously placing the N sections of the rotated short pipes on a fixed groove seat, wherein the fixed groove seat is provided with N +1 material supporting grooves which are arranged along a first transverse sequence.

The N short tubes are placed in N of the N +1 support troughs close to the chipless rotary cutting unit so as to avoid interference of the first pipe moving manipulator unit 8 and the second pipe moving manipulator unit and enable the second pipe moving manipulator unit 9 to grab the last short tube and the first pipe moving manipulator unit to place the N short tubes on the first N support troughs, and the N short tubes can be roughly synchronously carried out or carried out at the shortest interval.

And a step, namely grabbing the short pipe sections arranged at the front end by using a second pipe moving manipulator unit to perform pipe end processing, synchronously lifting the rest short pipes to a position where the short pipes are separated from the material supporting grooves in the vertical direction by using N material supporting grooves on the pipe moving groove seat, synchronously stepping the short pipes towards the material moving direction by a first distance, and synchronously descending to be placed on the fixed groove seat.

And a pipe bending step S3, in which the pipe bending unit is used for performing pipe bending on the short pipe subjected to pipe end treatment to obtain a pipe connection of the bent-pipe-shaped electronic expansion valve. Before the short pipe is bent, the short pipe after being processed at the pipe end is positioned at the pipe end. In this embodiment, after the short pipe 02 shown in fig. 3 is bent, the electronic expansion valve connection pipe 03 shown in fig. 4 and 17 is obtained.

In the above embodiment, for a pipe segment whose both ends are required to be subjected to pipe end processing, the pipe end processing unit simultaneously performs pipe end processing on both ends of the pipe segment, and if only one end of the pipe segment is required to be subjected to pipe end processing, the pipe end processing unit performs pipe end processing on the corresponding end of the pipe segment.

In the present invention, "alternately transferring" in "transferring tube segments cut by two or more tube segment supply units arranged side by side to a tube end processing unit alternately" is configured to transfer tube segments cut in the same round to the tube end processing unit one by one, and then transfer tube segments cut in the next round to the tube end processing unit one by one.

In the present invention, the "lateral direction" is configured as a direction parallel to a certain reference plane, in the above-described embodiment, a direction configured as a direction parallel to the XOY plane, i.e., the horizontal direction, and the "longitudinal direction" is configured as a normal to the above-described reference plane, in the above-described embodiment, the Z-axis direction, i.e., the vertical direction.

In the above embodiments, although the concept of the present invention is exemplified by the manufacturing of the electronic expansion valve, a person skilled in the art may perform the manufacturing of the connecting pipes of other structures by adaptively setting the structure of the pipe end processing unit, for example, after omitting the pipe bending unit, the EC connecting pipe in the four-way valve and the branch-shaped connecting pipe in the electronic expansion valve may be used for producing, and the pipe bender may be replaced by other functional units at subsequent stations.

The main idea of the invention is to cut a long pipe into short pipe sections by adopting a multi-path chipless rotary cutting unit, and to alternately transfer the short pipe sections cut in sequence to a pipe end processing unit for pipe section processing, thereby avoiding the generation of chips, keeping the cleanness of the production environment and better matching the processing efficiency between a feeding system and a processing and forming system. According to the conception, the structures of the core rod unit, the pipe bending machine head, the clamping die and the guide die in the pipe bending unit have various obvious changes; the function of the stepping material distribution unit can be completed by adopting a plurality of mechanical arms, so that the function of alternative transfer is completed, for example, a plurality of mechanical arms which are independently controlled and can move around the annular supporting beam in a rotary manner grab the pipe sections cut out in the current round and then convey the pipe sections to the pipe end processing unit one by one.

Claims

1. A manufacturing method of an electronic expansion valve connecting pipe is characterized by comprising the following steps:

a pipe section feeding step, namely synchronously straightening the front ends of N coil pipes into a long pipe section by utilizing N groups of straightening units arranged side by side, and synchronously cutting the long pipe section into short pipes by utilizing N groups of chipless rotary cutting units arranged side by side; n is greater than or equal to two;

a pipe end processing step of sequentially performing pipe end processing on at least one end of each short pipe by the pipe end processing units according to the position arrangement sequence among the chipless rotary cutting units and the short pipes cut by the N groups of chipless rotary cutting units arranged side by side in a single time;

after the pipe end processing step, performing pipe bending processing on the short pipe subjected to pipe end processing by using a pipe bending unit to obtain a bent pipe-shaped electronic expansion valve connecting pipe; before the short pipe is bent, the pipe end of the short pipe after being processed by the pipe end is positioned;

the pipe bending unit comprises a pipe bending machine head, a core rod unit and a discharging unit; the pipe bending machine head comprises a clamping die, a round die and a swing arm; the mandrel unit comprises a mandrel and a mandrel driving mechanism for driving the mandrel to extend into or withdraw from the pipe section; the discharging unit comprises a pushing sleeve sleeved outside the core rod and a pushing driving device used for driving the pushing sleeve to reciprocate along the axial direction of the core rod; a material guide plate is fixedly arranged at the fixed end part of the swing arm, is vertically positioned between the circular die and the swing arm and comprises an inclined base plate with an avoidance port matched with the mounting seat of the circular die; when the clamping die cavity of the clamping die is axially arranged along the axial direction of the core rod, the inclined substrate is obliquely arranged downwards along the direction of the round die departing from the core rod driving mechanism, and flanges are fixedly arranged on the edge part of the inclined substrate facing the clamping die and the edge part of the inclined substrate facing the core rod driving mechanism;

along the advancing direction of the pipe section processing process, the pipe end processing unit comprises a pipe end rotary punching unit and a pipe end direct punching unit; the pipe end rotary punching unit comprises a first pipe section clamping die, a first pipe end processing machine head and a second pipe end processing machine head, wherein the first pipe section clamping die is positioned on two sides of the first pipe section clamping die, the processing sides of the first pipe section clamping die face the first pipe section clamping die, and the rotating main shafts of the first pipe end processing machine head and the second pipe end processing machine head are arranged along the direction vertical to the advancing direction; the first pipe end processing machine head is an expanding device, the second pipe end processing machine head is a necking device, in the pipe end processing process, the expanding processing and the necking processing are simultaneously carried out on two ends of the pipe section clamped on the first pipe section clamping die through an expanding die and a necking die, and chamfering blades synchronously driven by a rotating main shaft of the expanding die and the necking die are arranged beside the expanding die and the necking die so as to synchronously chamfer two ends of the pipe section in the rotary punching process;

the pipe end direct punching unit comprises a second pipe section clamping die, a third pipe end processing machine head and a fourth pipe end processing machine head, wherein the third pipe end processing machine head and the fourth pipe end processing machine head are positioned on two sides of the second pipe section clamping die, the processing sides of the third pipe end processing machine head and the fourth pipe end processing machine head face the second pipe section clamping die, and driving main shafts of the third pipe end processing machine head and the fourth pipe end processing machine head are arranged along a direction perpendicular to the advancing direction; and the third pipe end processing machine head and the fourth pipe end processing machine head are both flaring devices, and in the pipe end processing process, the flaring processing is simultaneously carried out on the two ends of the pipe section clamped on the second pipe section clamping die through a flaring die and a flaring die.

2. The manufacturing method according to claim 1, wherein the axes of the rotating main shafts of the N groups of chipless rotary cutting units are coplanar and the axial intervals are all a first interval, and the step of sequentially performing pipe end treatment on at least one end portion of each short pipe according to the positional arrangement sequence between the chipless rotary cutting units comprises:

a rotation step, namely synchronously rotating N sections of short pipes by 90 degrees around the same rotation axis by using a first pipe moving manipulator unit according to the position arrangement sequence of N groups of chipless rotary cutting units until the synchronously cut N sections of short pipes are sequentially arranged along a first transverse direction;

a positioning step, namely synchronously placing the N sections of rotated short pipes on a fixed groove seat, wherein the fixed groove seat is provided with N +1 positioning material supporting grooves which are sequentially arranged along the first transverse direction;

a step, a second pipe moving manipulator unit is used for grabbing short pipe sections arranged at the front end to perform pipe end processing, N shifting material supporting grooves on a shifting groove seat are used for synchronously lifting the rest short pipes to be separated from the positioning material supporting grooves in the vertical direction, the first distance is synchronously stepped towards the material moving direction, and the short pipes are synchronously lowered to be placed on the fixed groove seat;

repeating the step until the short pipe on the fixed groove seat is completely grabbed;

the fixed groove seat comprises two fixed groove plates which are arranged in parallel, the shifting groove seat comprises side groove plates which are positioned on two outer sides of the two fixed groove plates, the length direction of the groove plates is arranged along the material shifting direction, the surfaces of the groove plates are arranged along the vertical direction, and V-shaped positioning grooves which are arranged on the upper side surfaces of the groove plates form a part for supporting the material groove;

the stepping driving unit is used for driving the shifting groove seat to move relative to the fixed groove seat and comprises a sliding plate seat, a driving device for driving the sliding plate seat to reciprocate along the material shifting direction, a lifting plate which is vertically movably arranged on the sliding plate seat and a driving device for driving the lifting plate to lift vertically; the shifting groove seat is installed on the lifting plate.

3. The manufacturing method according to claim 2, characterized in that:

first pipe manipulator unit that moves includes the mount pad, apart from install first interval N presss from both sides material claw on the mount pad, receives to transfer the drive arrangement drive and follow move the first slide of transferring that the material direction removed, the drive the mount pad is relative first transfer the elevating system that the slide goes up and down, and the drive the mount pad is relative first transfer the slide around vertical axis pivoted rotary mechanism.