A pipe threading machine and a pipe threading method

Abstract

The present invention provides a pipe threading machine and a pipe threading method. The pipe threading machine includes a clamping part and a pushing and pulling part. The clamping part can clamp a plastic pipe, and the pushing and pulling part is connected to the clamping part and pushes or pulls the clamping part. The pipe threading method includes: Step S1: Feed a metal pipe and a plastic pipe to their respective supporting positions. Step S2: A first driving mechanism pushes the clamping part through the metal pipe. Step S3: After one end of the plastic pipe is placed between the collet outer sleeve and the collet inner core, start a second driving mechanism to drive the collet outer sleeve to move to clamp the plastic pipe between the collet outer sleeve and the collet inner core. Step S4: The first driving mechanism pulls the clamping part, and the clamping part passes through the metal pipe. Step S5: Release the plastic pipe, and remove the metal pipe and the plastic pipe from the metal pipe feeding rack. The present invention can automatically complete the operation of threading a plastic pipe into a metal pipe, is applicable to the pipe threading operation of pipes with different diameters, has a simple pipe threading method, less manual intervention, and high pipe threading efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe processing, and particularly to a pipe threading machine and a pipe threading method. Background Art

[0002] A metal-plastic composite pipe is a pipe formed by composite molding with a metal pipe on the outer layer and a plastic pipe on the inner layer through a certain process, and has the advantages of both metal pipes and non-metal pipes. During processing, the plastic pipe needs to be first placed inside the metal pipe, and then a composite process is carried out to make the plastic pipe and the inner wall of the metal pipe be composite-connected. However, the ratio of the length to the outer diameter of general pipes is relatively large, and it is relatively difficult to place the plastic pipe inside the metal pipe. During traditional manual installation, two people are required to be located at both ends of the pipe respectively. One person pushes the plastic pipe and the other person pulls the plastic pipe to complete the operation of placing the plastic pipe inside the metal pipe. The above operation method has low efficiency and consumes manpower, which is not conducive to the automation and intellectualization of pipe processing. Summary of the Invention

[0003] Aiming at the above problems existing in the prior art, the purpose of the present invention is to provide a pipe threading machine and a pipe threading method, which can automatically complete the operation of threading a plastic pipe into a metal pipe, are applicable to the pipe threading operations of pipes with different pipe diameters, the pipe threading method is simple, safe, stable, requires less manual intervention, has low requirements for workers, saves time and effort, has high pipe threading efficiency, and realizes the pipe threading work of the plastic pipe and makes the chuck automatically reset by pushing and pulling to drive the chuck assembly to reciprocate, which is conducive to the automation of the pipe threading process.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A pipe threading machine includes a clamping part and a pushing and pulling part. The clamping part can clamp a plastic pipe. The pushing and pulling part is connected to the clamping part and pushes or pulls the clamping part. The pushing and pulling part pushes the clamping part that has not clamped the plastic pipe through the metal pipe, and the pushing and pulling part pulls the clamping part that has clamped the plastic pipe through the metal pipe.

[0006] As a further improvement of the above technical solution:

[0007] The pipe threading machine further includes a support adjusting frame. The support adjusting frame includes a support plate, and the height of the support plate is adjustable. One end of the clamping part is hinged to the pushing and pulling part, the middle part is supported on the support plate, and the other end can clamp the plastic pipe.

[0008] The clamping part includes a chuck assembly. The chuck assembly includes a chuck outer sleeve and a chuck inner core. The pushing and pulling part includes a second driving mechanism. The second driving mechanism is connected to and drives the chuck outer sleeve to linearly move relative to the chuck inner core, so that the chuck outer sleeve presses the chuck inner core or the chuck outer sleeve and the chuck inner core are separated.

[0009] The pushing and pulling part further includes a first driving mechanism. The first driving mechanism is connected to and drives the clamping part to reciprocate linearly.

[0010] The pushing and pulling part further includes a moving base, one end of the clamping part and the second driving mechanism are installed on the moving base, and the first driving mechanism is connected to and drives the moving base to move linearly back and forth.

[0011] The clamping part further includes a sleeve rod assembly, and the sleeve rod assembly further includes an inner rod and an outer tube. The outer tube is tubular, the inner rod is rod-shaped, one end of the outer tube is connected to the second driving mechanism, the other end is connected to the chuck outer sleeve, one end of the inner rod is connected to the moving base, and the other end passes through the chuck outer sleeve and then is connected to the chuck inner core.

[0012] The first driving mechanism includes a motor and a transmission mechanism. The motor transmits the drive to the moving base through the transmission mechanism, and the transmission mechanism is a sprocket and chain transmission mechanism.

[0013] The pipe threading machine further includes a controller and a positioning assembly for positioning the position of the clamping part. The positioning assembly includes two photoelectric switches and an induction block, and the photoelectric switches are electrically connected to the controller.

[0014] A pipe threading method, based on the above pipe threading machine, includes the following steps:

[0015] Step S1: Feed the metal pipe into the metal pipe feeding rack for supporting the metal pipe, and feed the plastic pipe into the plastic pipe feeding rack for supporting the plastic pipe;

[0016] Step S2: Start the first driving mechanism, and the first driving mechanism pushes the clamping part, and the clamping part passes through the metal pipe;

[0017] Step S3: Clamp the plastic pipe: Place one end of the plastic pipe between the chuck outer sleeve and the chuck inner core, and then start the second driving mechanism. The second driving mechanism drives the chuck outer sleeve to move towards the chuck inner core until one end of the plastic pipe is clamped between the chuck outer sleeve and the chuck inner core;

[0018] Step S4: Start the first driving mechanism, and the first driving mechanism pulls the clamping part, and the clamping part passes through the metal pipe;

[0019] Step S5: Loosen the plastic pipe, and move the metal pipe and the plastic pipe out of the metal pipe feeding rack.

[0020] Before step S2, if the metal pipe and the clamping part do not have a common center line, adjust the height of the support plate. The support plate drives the height of the clamping part supported by it to change until the clamping part can pass through the metal pipe horizontally.

[0021] The beneficial effects of the present invention are: It can automatically complete the operation of threading the plastic pipe into the metal pipe, is applicable to the pipe threading operation of pipes with different diameters, the pipe threading method is simple, safe, stable, requires less manual intervention, has low requirements for workers, saves time and effort, has high pipe threading efficiency, drives the chuck assembly to move back and forth by pushing and pulling, realizes the pipe threading work of the plastic pipe and makes the chuck automatically reset, which is beneficial to the automation of the pipe threading process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0023] Figure 2 is Figure 1 a schematic diagram of another perspective;

[0024] Figure 3 is a schematic structural diagram of a push-pull part of an embodiment of the present invention;

[0025] Figure 4 is Figure 3 a schematic diagram of another perspective;

[0026] Figure 5 is a schematic structural diagram of a support adjustment frame of an embodiment of the present invention;

[0027] Figure 6 is Figure 5 a schematic diagram of another perspective;

[0028] Figure 7 is a schematic structural diagram of a collet assembly of an embodiment of the present invention;

[0029] Figure 8 is a schematic diagram of the position of a moving base after passing a plastic tube through a metal tube in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] The following detailed description of the specific embodiments of the present invention is provided in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the present invention.

[0031] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "above" etc. may be used herein to describe the spatial position relationship of one device or feature to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "beneath" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made.

[0032] A pipe threading machine for threading a plastic pipe 2' into a metal pipe 1', asFigures 1 to 8 As shown in the figure, it includes a plastic pipe feeding rack 11, a metal pipe feeding rack 12, a metal pipe transfer mechanism, a clamping part, a pushing and pulling part 0, a support adjusting rack 8, a positioning component and a controller. The clamping part can clamp or loosen the plastic pipe 2'. The pushing and pulling part 0 is connected to the clamping part and pushes or pulls the clamping part. When the pushing and pulling part 0 pushes the clamping part through the metal pipe 1', the clamping part does not clamp the plastic pipe 2'; when the pushing and pulling part 0 pulls the clamping part through the metal pipe 1', the clamping part clamps the plastic pipe 2'.

[0033] The plastic pipe feeding rack 11 is used to place the plastic pipe 2' to be inserted into the metal pipe 1'. The metal pipe feeding rack 12 is used to place the metal pipe 1' so that the plastic pipe 2' is inserted into the metal pipe 1' on the metal pipe feeding rack 12. At least two second supporting wheels 121 are arranged in parallel at intervals on the metal pipe feeding rack 12, and the metal pipe 1' is supported on the second supporting wheels 121.

[0034] The metal pipe feeding rack 12 is located between the plastic pipe feeding rack 11 and the pushing and pulling part 0.

[0035] The metal pipe transfer mechanism is used to transfer the metal pipe 1', so that the metal pipe 1' is moved into or out of the metal pipe feeding rack 12. The metal pipe transfer mechanism includes a loading rack 22, an unloading rack 23 and at least one set of unloading components 24. The loading rack 22 and the unloading rack 23 are respectively located on both sides of the metal pipe feeding rack 12. The metal pipe 1' is placed on the loading rack 22, and then the metal pipe 1' on the loading rack 22 is sent onto the second supporting wheels 121 on the metal pipe feeding rack 12. After the pipe threading is completed, the metal pipe 1' and the plastic pipe 2' enter the unloading rack 23 from the metal pipe feeding rack 12.

[0036] The unloading component 24 realizes automatic unloading, and the unloading component 24 is installed on the metal pipe feeding rack 12. The unloading component 24 includes a second air cylinder and a flap. The second air cylinder is located below the metal pipe feeding rack 12. One end of the flap is hinged to the metal pipe feeding rack 12, the middle part is connected to the second air cylinder, and the other end extends. The hinged part of the flap and the metal pipe feeding rack 12 is located below the top of the metal pipe feeding rack 12, and the hinged end of the flap is closer to the unloading rack 23 than the extending end. The driving shaft of the second air cylinder rises or falls, driving one end of the flap to rotate relative to the other end. When rotating, the top of the flap descends below the top of the metal pipe feeding rack 12 so as not to interfere with the metal pipe 1', or the top of the flap rises above the top of the metal pipe feeding rack 12 to contact and push the metal pipe 1', so that the metal pipe 1' rolls from the metal pipe feeding rack 12 into the unloading rack 23. The second air cylinder is electrically connected to the controller.

[0037] In this embodiment, two sets of unloading components 24 are provided, and the two sets of unloading components 24 are arranged at intervals.

[0038] The clamping part includes a chuck assembly 3 and a sleeve rod assembly 4. The chuck assembly 3 is used to clamp the plastic pipe 2', and the sleeve rod assembly 4 transmits the thrust or pulling force of the pushing and pulling part 0 to the chuck assembly 3.

[0039] The chuck assembly 3 includes a chuck outer sleeve 31 and a chuck inner core 32. The shape of the chuck inner core 32 is a frustum of a cone or a frustum of a pyramid, that is, the two ends of the chuck inner core 32 are respectively a small head end and a large head end, the outer diameter of the small head end is smaller than that of the large head end, and the small head end is closer to the pushing and pulling part 0 than the large head end. The center line of the chuck inner core 32 is horizontally arranged. The chuck outer sleeve 31 is located between the chuck inner core 32 and the pushing and pulling part 0. A groove is provided on the surface of the chuck outer sleeve 31 close to the chuck inner core 32, and the side surface of the chuck inner core 32 is in contact with the groove wall surface of the chuck outer sleeve 31 to realize the function of clamping the plastic pipe 2'. Preferably, a through hole is provided on the chuck outer sleeve 31, and the through hole passes through the center line of the groove.

[0040] The sleeve rod assembly 4 includes an inner rod 41 and an outer tube 42. The outer tube 42 is tubular, the inner rod 41 is rod-shaped, one end of the outer tube 42 is connected to the pushing and pulling part 0, and the other end is connected to the chuck outer sleeve 31. One end of the inner rod 41 is connected to the pushing and pulling part 0, and the other end passes through the chuck outer sleeve 31 and is connected to the chuck inner core 32. The inner rod 41 and the outer tube 42 are coaxially arranged, and the center lines of the inner rod 41 and the outer tube 42 are horizontally arranged.

[0041] Based on the above structure, when the inner rod 41 and the outer tube 42 move relative to each other in the direction of their center lines, the chuck outer sleeve 31 and the chuck inner core 32 can be driven to move relative to each other, so that the chuck outer sleeve 31 and the chuck inner core 32 are separated or the two are fitted and pressed.

[0042] The pushing and pulling part 0 includes a first driving mechanism, a moving base 6 and a second driving mechanism.

[0043] The second driving mechanism is installed on the moving base 6, and one end of the inner rod 41 is connected to the moving base 6. Preferably, one end of the inner rod 41 is hinged to the moving base 6. Specifically, one end of the inner rod 41 is hinged to the moving base 6 through a first hinge rod. One end of the first hinge rod is hinged to the moving base 6, and the other end is hinged to one end of the inner rod 41. The second driving mechanism connects and drives the outer tube 42 to move linearly back and forth in the direction of its center line, so as to drive the chuck outer sleeve 31 to move linearly relative to the chuck inner core 32. The first driving mechanism connects and drives the moving base 6 to move linearly back and forth.

[0044] The second driving mechanism includes an air pipe 71, a first cylinder 72, and a drag chain 73. The first cylinder 72 is installed on the moving base 6. The first cylinder 72 is connected to and drives the outer pipe 42 to move linearly back and forth. Preferably, one end of the outer pipe 42 is hinged to the driving shaft of the first cylinder 72 through a second hinge rod. One end of the second hinge rod is hinged to the driving shaft of the first cylinder 72, and the other end is hinged to one end of the outer pipe 42. The air pipe 71 is connected to the first cylinder 72 and an external high-pressure air source to provide power for the driving of the first cylinder 72. The air pipe 71 adapts to the movement of the first cylinder 72 through the drag chain 73. The second driving mechanism is electrically connected to the controller to control the action of the first cylinder 72 through the controller. The technical solution for the controller to control the action of the first cylinder 72 can adopt the solutions in the prior art and will not be elaborated here.

[0045] In this embodiment, a program is preset, and the controller controls the driving shaft of the first cylinder 72 to move a set distance according to the set program.

[0046] The first driving mechanism includes a driving base 51, a motor 52, a speed reducer 53, a transmission base 54, and a transmission mechanism. The driving base 51 and the transmission base 54 are fixedly installed on the ground or a working platform. The motor 52 and the speed reducer 53 are installed on the driving base 51, and the transmission mechanism is installed on the transmission base 54. The driving base 51, the transmission base 54, the metal pipe feeding rack 12, and the plastic pipe feeding rack 11 are arranged in sequence. The motor 52, the speed reducer 53, and the transmission mechanism are connected in sequence and transmit the drive, and the transmission mechanism is connected to the moving base 6. The motor 52 is electrically connected to the controller.

[0047] The transmission mechanism includes a first sprocket chain mechanism and two groups of second sprocket chain mechanisms. The first sprocket chain mechanism includes a first sprocket 551 and a first chain 552. The two groups of second sprocket chain mechanisms are arranged in parallel at intervals. The second sprocket chain mechanism includes a second chain 553 and two second sprockets 554. The two second sprockets 554 are rotatably installed on the transmission base 54. The two second sprockets 554 are arranged in the same plane, and the second chain 553 is sleeved on the two second sprockets 554. One second sprocket 554 of one group of second sprocket chain mechanisms and one second sprocket 554 of the other group of second sprocket chain mechanisms are coaxially connected to realize the synchronous transmission of the two groups of second sprocket chain mechanisms. Specifically, a synchronous shaft is provided. The two ends of the synchronous shaft are respectively fixedly connected to the centers of the two second sprockets 554, and the synchronous shaft and the two second sprockets 554 share the same center line.

[0048] The moving base 6 is fixedly connected to the two second chains 553 of the two groups of second sprocket chain mechanisms.

[0049] The outer diameters of the first sprocket 551 and the second sprocket 554 are different. The first sprocket 551 is rotatably sleeved on the output shaft of the speed reducer 53. A connecting wheel is also rotatably sleeved on the synchronous shaft. The first sprocket 551 and the connecting wheel are connected by a first chain 552 to transmit drive.

[0050] Based on the above structure, after the motor 52 is started, it drives the first sprocket 551 to rotate through the speed reducer 53. The first sprocket 551 drives the first chain 552 to transmit power. The first chain 552 drives the connecting wheel to rotate. The connecting wheel drives the synchronous shaft to rotate. The synchronous shaft drives the two second sprockets 554 connected thereto to rotate. The two second sprockets 554 drive the two second chains 553 to transmit power. The two second chains 553 drive the moving base 6 to move linearly.

[0051] Furthermore, a first lead screw 511 for adjusting the height of the drive base 51 is provided on the drive base 51.

[0052] A plurality of first supporting wheels 542 and at least one set of retaining seats are provided on the transmission base 54. The plurality of first supporting wheels 542 are arranged in parallel at intervals on the transmission base 54. The first supporting wheels 542 are used to support the outer tube 42 moved onto the transmission base 54. The retaining seats are used to limit the moving parts to prevent the moving base 6 from deviating beyond the allowable range of the error process in the direction perpendicular to the center line of the metal tube 1'. Specifically, each set of retaining seats includes two baffles 541, and the two baffles 541 are respectively connected to both sides of the transmission base 54, that is, the moving base 6 is restricted between the two baffles 541.

[0053] The support adjusting frame 8 is used to support the sleeve rod assembly 4 and adjust the height of the sleeve rod assembly 4 so that the pipe threading machine is applicable to pipes of different diameters. The support adjusting frame 8 includes a support plate 83, a plurality of second lead screws 81, and at least two support seats 82. The second lead screws 81 are arranged perpendicular to the horizontal plane. The two support seats 82 are arranged at intervals. The support seats 82 are sleeved on the second lead screws 81. Nuts are screwed on the second lead screws 81, and the nuts are located below the support seats 82. The support seats 82 are supported on the nuts. By adjusting the nuts, the position of the support seats 82 on the second lead screws 81 can be adjusted, that is, the height of the support seats 82 can be adjusted. The support plate 83 is connected to the support seats 82, and the sleeve rod assembly 4 is supported on the support plate 83. When the height of the support seat 82 is adjusted, the first hinge rod and the second hinge rod rotate, and the inner rod 41 of the sleeve rod assembly 4 and the hinge end of the moving base 6 and the hinge end of the outer tube 42 and the first cylinder 72 adapt to the height change of the support seat 82, so that the height of the sleeve rod assembly 4 changes, and the inner rod 41 and the outer tube 42 still remain horizontal after the height adjustment.

[0054] In this embodiment, there are four second lead screws 81 and two support seats 82. The four second lead screws 81 are located on four parallel edges of a cuboid. The two support seats 82 are arranged in parallel at intervals. Both ends of each support seat 82 are sleeved on two second lead screws 81 respectively. Both ends of the support plate 83 are connected to the two support seats 82 respectively.

[0055] The positioning assembly is used to position the clamping part so that it stops at a set position. The positioning assembly includes two photoelectric switches 91 and an induction block. The photoelectric switches 91 are electrically connected to the controller. The two photoelectric switches 91 are installed on the transmission base 54 at intervals, and the induction block is installed on the moving base 6. When the moving base 6 moves in one direction, the induction block is driven to move synchronously. When it moves to a position where one photoelectric switch 91 detects the induction block, the controller receives the detection information of the photoelectric switch 91 and controls the motor 52 to stop driving, and the moving base 6 stops moving. At this time, the chuck assembly 3 is at the extreme position outside one end of the metal tube 1'; when the moving base 6 moves in the other direction, the induction block is driven to move synchronously. When it moves to a position where the other photoelectric switch 91 detects the induction block, the controller controls the motor 52 to stop driving. At this time, the chuck assembly 3 is at the extreme position outside the other end of the metal tube 1'. That is, the positioning assembly defines the moving range of the moving base 6, so that the moving base 6 stops at two set positions.

[0056] Based on the above pipe threading method of the pipe threading machine, it includes the following steps:

[0057] Step S1: Feed the metal tube 1' onto the metal tube feeding rack 12, and feed the plastic tube 2' onto the plastic tube feeding rack 11.

[0058] In this step, the metal tube 1' is supported on the second supporting wheel 121. The metal tube 1' on the second supporting wheel 121 and the inner rod 41 share the same center line.

[0059] If the metal tube 1' on the second supporting wheel 121 and the inner rod 41 do not share the same center line, then adjust the nut on the second lead screw 81 to change the height of the support seat 82 and the support plate 83. The support plate 83 drives the height of the inner rod 41 and the outer tube 42 supported by it to change until the outer tube 42 and the metal tube 1' share the same center line, so that the chuck assembly 3 and the sleeve rod assembly 4 can pass through the metal tube 1'.

[0060] Step S2: Start the first driving mechanism. The first driving mechanism pushes the clamping part, and the clamping part passes through the metal tube 1'.

[0061] In this step, the motor 52 is started. The motor 52 drives and transmits power to the moving base 6 through the speed reducer 53, the first sprocket 551, the first chain 552, the connecting wheel, the synchronizing shaft, the second sprocket 554, and the second chain 553 in sequence, so that the moving base 6 moves along the central line direction of the inner rod 41 towards the plastic pipe 2'. When the sensing block is detected by a photoelectric switch 91, the controller controls the motor 52 to stop, and the moving base 6 stops moving. At this time, the chuck assembly 3 has passed through the metal pipe 1' and is located at one end close to the plastic pipe 2'.

[0062] Step S3: Clamp the plastic pipe 2': Place one end of the plastic pipe 2' between the chuck outer sleeve 31 and the chuck inner core 32, and then start the second driving mechanism. The second driving mechanism drives the chuck outer sleeve 31 to move towards the chuck inner core 32 until one end of the plastic pipe 2' is clamped between the chuck outer sleeve 31 and the chuck inner core 32.

[0063] In this step, a plurality of openings are pre-cut at one end of the plastic pipe 2' close to the metal pipe 1' to facilitate placing the plastic pipe 2' between the chuck outer sleeve 31 and the chuck inner core 32. Place the chuck inner core 32 into one end of the plastic pipe 2', and place the cut part between the chuck outer sleeve 31 and the chuck inner core 32.

[0064] In this step, the first cylinder 72 of the second driving mechanism drives the chuck outer sleeve 31 to move towards the chuck inner core 32 by a set distance and then stops and holds. At this time, one end of the plastic pipe 2' is clamped by the chuck outer sleeve 31 and the chuck inner core 32. After clamping, it can be ensured that the plastic pipe 2' will not be separated from the chuck assembly 3 during the pipe threading process.

[0065] Step S4: Start the first driving mechanism, and the first driving mechanism pulls the clamping part, and the clamping part passes through the metal pipe 1'.

[0066] In this step, the moving direction of the moving base 6 is opposite to that of the moving base 6 in step S2. The moving base 6 moves along the central line direction of the inner rod 41 towards the direction away from the plastic pipe feeding rack 11. When the sensing block is detected by another photoelectric switch 91, the controller controls the motor 52 to stop, and the moving base 6 stops moving. At this time, the chuck assembly 3 has passed through the metal pipe 1' with the plastic pipe 2', and the chuck assembly 3 is located outside the plastic pipe 2'.

[0067] Step S5: Loosen the plastic pipe 2', and remove the metal pipe 1' and the plastic pipe 2' from the metal pipe feeding rack 12.

[0068] In this step, the first cylinder 72 is started, so that the first cylinder 72 drives the collet outer sleeve 31 to move in the direction away from the collet inner core 32 along its center line. The first cylinder 72 moves a set distance according to a set program, so that the collet outer sleeve 31 and the collet inner core 32 are separated, and one end of the plastic pipe 2' is loosened. At this time, the plastic pipe 2' has been inserted into the metal pipe 1' and needs to be transferred to the subsequent process.

[0069] After one end of the plastic pipe 2' is loosened, the second cylinder is started. The drive shaft of the second cylinder rises, pushing the flap, so that the flap rotates relative to the metal pipe feeding rack 12. The overhanging end of the flap rises to contact the outer wall of the metal pipe 1' and pushes the metal pipe 1', so that the metal pipe 1' rolls onto the blanking rack 23 and enters the blanking rack 23.

[0070] Finally, it is necessary to state here that the above embodiments are only used to further illustrate the technical solutions of the present invention in detail, and cannot be understood as a limitation on the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention all fall within the protection scope of the present invention.

Claims

1. A pipe threading machine, characterized in that: It includes a clamping part, a pushing and pulling part (0), a support adjusting frame (8), a metal pipe feeding rack (12) and a metal pipe transfer mechanism. The clamping part can clamp a plastic pipe (2'). The pushing and pulling part (0) is connected to the clamping part and pushes or pulls the clamping part. The pushing and pulling part (0) pushes the clamping part that has not clamped the plastic pipe (2') through the metal pipe (1'), and the pushing and pulling part (0) pulls the clamping part that has clamped the plastic pipe (2') through the metal pipe (1'). The pushing and pulling part (0) includes a first driving mechanism, a second driving mechanism and a moving base (6). One end of the clamping part and the second driving mechanism are installed on the moving base (6). The first driving mechanism is connected to and drives the moving base (6) to move linearly back and forth. The clamping part includes a chuck assembly (3) and a sleeve rod assembly (4). The chuck assembly (3) includes a chuck outer sleeve (31) and a chuck inner core (32). The sleeve rod assembly (4) includes an inner rod (41) and an outer tube (42). The outer tube (42) is tubular, and the inner rod (41) is rod-shaped. One end of the outer tube (42) is connected to the second driving mechanism, and the other end is connected to the chuck outer sleeve (31). One end of the inner rod (41) is connected to the moving base (6), and the other end passes through the chuck outer sleeve (31) and is connected to the chuck inner core (32). The inner rod (41) and the outer tube (42) are coaxially arranged. The second driving mechanism is connected to and drives the chuck outer sleeve (31) to move linearly in the center line direction of the inner rod (41) and the outer tube (42) relative to the chuck inner core (32), so that the chuck outer sleeve (31) presses the chuck inner core (32) or separates the chuck outer sleeve (31) from the chuck inner core (32). The support adjusting frame (8) is used to support the sleeve rod assembly (4) and adjust the height of the sleeve rod assembly (4). The metal pipe transfer mechanism includes a loading rack (22), an unloading rack (23) and at least one set of unloading components (24). The loading rack (22) and the unloading rack (23) are respectively located on both sides of the metal pipe feeding rack (12). The unloading component (24) includes a second air cylinder and a flap. The second air cylinder is located below the metal pipe feeding rack (12). One end of the flap is hinged to the metal pipe feeding rack (12), the middle is connected to the second air cylinder, and the other end extends. The hinged part of the flap and the metal pipe feeding rack (12) is located below the top of the metal pipe feeding rack (12), and the hinged end of the flap is closer to the unloading rack (23) than the extending end. The driving shaft of the second air cylinder rises or falls, driving one end of the flap to rotate relative to the other end. When rotating, the top of the flap drops below the top of the metal pipe feeding rack (12) so as not to interfere with the metal pipe (1'), or the top of the flap rises above the top of the metal pipe feeding rack (12) to contact and push the metal pipe (1'), so that the metal pipe (1') rolls from the metal pipe feeding rack (12) into the unloading rack (23).

2. The pipe threading machine according to claim 1, characterized in that: The support adjusting frame (8) includes a support plate (83). The height of the support plate (83) is adjustable. One end of the clamping part is hinged to the pushing and pulling part (0), the middle is supported on the support plate (83), and the other end can clamp the plastic pipe (2').

3. The pipe threading machine according to claim 1, characterized in that: The first driving mechanism includes a motor (52) and a transmission mechanism. The motor (52) transmits driving force to the moving base (6) through the transmission mechanism, and the transmission mechanism is a sprocket and chain transmission mechanism.

4. The pipe threading machine according to claim 1, characterized in that: The pipe threading machine further includes a controller and a positioning assembly for positioning the position of the clamping part. The positioning assembly includes two photoelectric switches (91) and an induction block, and the photoelectric switches (91) are electrically connected to the controller.

5. A pipe threading method, based on the pipe threading machine according to any one of claims 1 to 4, characterized in that: It includes the following steps: Step S1: Feed the metal pipe (1’) into the metal pipe feeding rack (12) for supporting the metal pipe (1’), and feed the plastic pipe (2’) into the plastic pipe feeding rack (11) for supporting the plastic pipe (2’); Step S2: Start the first driving mechanism, and the first driving mechanism pushes the clamping part, and the clamping part passes through the metal pipe (1’); Step S3: Clamp the plastic pipe (2’): Place one end of the plastic pipe (2’) between the chuck outer sleeve (31) and the chuck inner core (32), and then start the second driving mechanism. The second driving mechanism drives the chuck outer sleeve (31) to move towards the chuck inner core (32) until one end of the plastic pipe (2’) is clamped between the chuck outer sleeve (31) and the chuck inner core (32); Step S4: Start the first driving mechanism, and the first driving mechanism pulls the clamping part, and the clamping part passes through the metal pipe (1’); Step S5: Loosen the plastic pipe (2’), and remove the metal pipe (1’) and the plastic pipe (2’) from the metal pipe feeding rack (12).

6. The pipe threading method according to claim 5, characterized in that: Before step S2, if the metal pipe (1’) and the clamping part do not have a common center line, adjust the height of the support plate (83). The support plate (83) drives the height of the clamping part supported by it to change until the clamping part can pass through the metal pipe (1’) horizontally.

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