Threading machine facilitating feeding and retracting of cutter
By designing a threading machine that includes a mold shell, a receiving sleeve, a die head assembly and an advance and retract knife assembly, the problem of inconvenient knife advancement and retraction of the existing manual threading machine is solved, and a more efficient knife advance and retreat operation is achieved.
Patent Information
- Application Number
- CN202421044011.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-14
AI Technical Summary
The existing manual wire zipper needs to disassemble and assemble parts during the advance and withdrawal process, which makes the advance and withdrawal process inconvenient enough.
A threading machine including a mold shell, a receiving sleeve, a die head assembly and an advance and retract knife assembly is designed. The advance and retract knife assembly can be movably arranged on the mold shell and can be matched or released from the receiving sleeve. Through the action of the pull finger and the spring Cooperate with it to achieve convenient conversion of knife advance and retreat.
Through this design, the convenience of advancing and retracting the knife is significantly improved, the operation is smoother, and the need for disassembly and assembly of parts is reduced.
Smart Images
Figure CN222370566U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of pipeline installation, and in particular to a threading machine that is convenient for advancing and retracting a cutter. Background Art
[0002] A manual threading tool is a tool used to process threads on the outer surface of a metal pipe so that the pipe can be connected to other accessories (such as joints, valves) with the same specification of threads. This tool is suitable for home repairs, pipeline installation or small engineering operations.
[0003] Manual threading tools include a manual threading machine, which is usually provided with a handle. An operator cuts threads on a pipe by hand-cranking or manually rotating the handle. However, some existing manual threading machines may need to disassemble and assemble certain parts in order to complete the transition between advancing and retracting the tool, which results in the defect that the advancing and retracting of the tool is not convenient enough. Utility Model Content
[0004] The purpose of the present application includes, for example, providing a threading machine that is easy to advance and retract the knife, which can improve the convenience of advancing and retracting the knife.
[0005] This application can be implemented as follows:
[0006] The present application provides a threading machine that is convenient for advancing and retracting a knife, which includes a mold shell, a socket sleeve, a die head assembly and an advance and retract knife assembly. The socket sleeve is arranged in the mold shell, the die head assembly is arranged in the socket sleeve, the die head assembly is used for processing threads, the advance and retract knife assembly can be movably arranged on the mold shell, and the advance and retract knife assembly can be matched or released with the socket sleeve.
[0007] Optionally, the advance and retract knife assembly includes a finger and a spring, the finger is movably connected to the mold shell, the spring is sleeved on the finger, and under the elastic force of the spring, one end of the finger extends into the mold shell and cooperates with the receiving sleeve, and the other end of the finger is provided with a handle.
[0008] Optionally, a sleeve is provided on the outer side of the mold shell, the finger is inserted into the sleeve, a first step is provided in the sleeve, a second step is provided on the finger, and two ends of the spring abut against the first step and the second step respectively.
[0009] Optionally, a rectangular protrusion is provided on the handle, and a rectangular groove is provided on one end of the sleeve away from the mold shell, and the rectangular protrusion and the rectangular groove match in shape and can cooperate with each other.
[0010] Optionally, one end of the wrench extending into the mold shell is provided with a first abutting surface and a second abutting surface, the angle between the first abutting surface and the second abutting surface is an acute angle, and the outer side surface of the receiving sleeve is provided with a plurality of first bosses at intervals along the circumferential direction, and the first abutting surface and the second abutting surface are both used for abutting against any of the first bosses;
[0011] When the first abutting surface abuts against any of the first bosses, the mold shell can drive the receiving sleeve to move synchronously; when the second abutting surface abuts against any of the first bosses, the finger moves away from the receiving sleeve, and the mold shell moves relative to the receiving sleeve.
[0012] Optionally, one end of the thumb ring away from the receiving sleeve is inserted into the handle, and the handle and the thumb ring are interference fit.
[0013] Optionally, a flange is provided at one end of the socket sleeve, and a first retaining spring is provided at the other end of the socket sleeve. The flange and the first retaining spring are respectively abutted against two sides of the mold shell, and a second retaining spring is provided between the socket sleeve and the die head assembly.
[0014] Optionally, the die head assembly includes a die head, a blade and an end cover, the die head portion is disposed in the receiving sleeve, the blade is inserted into the die head, and the end cover is connected to the die head to fix the blade.
[0015] Optionally, the die head is provided with at least two second bosses along its circumference, each of the second bosses is provided with two connected first mating surfaces, and the receiving sleeve is provided with a plurality of second mating surfaces connected in sequence along the circumference, and the two first mating surfaces of each second boss are respectively mated with two adjacent second mating surfaces.
[0016] Optionally, an inclined step surface is provided at one end of each of the second bosses facing away from the end cover.
[0017] The beneficial effects of the threading machine that is easy to advance and retract the knife of the present application include, for example: in order to improve the convenience of advancing and retracting the knife, a threading machine that is easy to advance and retract the knife is designed, the threading machine includes a mold shell, a socket sleeve, a die head assembly and a knife advance and retract assembly, the socket sleeve is arranged in the mold shell, the die head assembly is arranged in the socket sleeve, the die head assembly is used for processing threads, the knife advance and retract assembly can be movably arranged on the mold shell, and the knife advance and retract assembly can be matched or released with the socket sleeve. In the advance state, the advance and retract knife assembly cooperates with the socket sleeve, so that the mold shell rotates around the pipe fitting, while the advance and retract knife assembly drives the socket sleeve and the die head assembly to rotate synchronously, and the die head assembly processes threads on the pipe fitting; when the knife needs to be retracted, first release the cooperation between the advance and retract knife assembly and the socket sleeve, move and adjust the position of the advance and retract knife assembly and make the advance and retract knife assembly cooperate with the socket sleeve again, so that the advance and retract knife assembly is in the retract state, and then the mold shell rotates in the opposite direction around the pipe fitting, and the advance and retract knife assembly drives the socket sleeve and the die head assembly to rotate synchronously until the threading machine is detached from the pipe fitting, and the advance and retract knife action is completed more conveniently. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 A schematic diagram of a threading machine in an embodiment of the present application;
[0020] Figure 2 An exploded view of a threading machine in an embodiment of the present application;
[0021] Figure 3 This is a schematic diagram of the advance and retract tool assembly in an embodiment of the present application;
[0022] Figure 4 An exploded view of the die assembly in the embodiment of the present application;
[0023] Figure 5 This is a schematic diagram of the end cover in the embodiment of the present application;
[0024] Figure 6 This is an exploded view of the receiving sleeve in the embodiment of the present application;
[0025] Figure 7 It is a partial cross-sectional view of the threading machine in the embodiment of the present application.
[0026] Icon: 10-threading machine;
[0027] 100-mold shell; 110-sleeve; 111-first step; 112-rectangular groove; 120-oil pot; 121-oil outlet pipe; 122-oil sealing ball; 123-guiding surface; 124-oil pot plug;
[0028] 200- lever; 210- rod;
[0029] 300- receiving sleeve; 310- first boss; 320- second mating surface; 330- flange; 340- first retaining spring; 350- first annular groove; 360- second retaining spring; 370- second annular groove;
[0030] 400-die assembly; 410-die; 411-blade boss; 4111-blade groove; 420-blade; 421-positioning groove; 430-end cover; 431-positioning block; 440-screw; 450-second boss; 451-first mating surface; 452-slot; 453-angle step surface;
[0031] 500 - knife advance and retract assembly; 510 - thumb; 511 - second step; 512 - first abutting surface; 513 - second abutting surface; 520 - spring; 530 - handle; 531 - rectangular protrusion. DETAILED DESCRIPTION
[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0033] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0035] In the description of the present application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, it is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0036] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.
[0037] It should be noted that, in the absence of conflict, the features in the embodiments of the present application may be combined with each other.
[0038] Please refer to Figure 1 , Figure 2 The threading machine 10 provided in the embodiment of the present application includes a mold shell 100 and a lever 200, the lever 200 includes a plurality of rod sections 210, and the plurality of rod sections 210 are detachably connected to each other, wherein one of the rod sections 210 is detachably connected to the mold shell 100.
[0039] It should be noted that the multiple sections of rods 210 are arranged in sequence along the same direction, adjacent rods 210 are detachably connected, and a section of the rods 210 at one end of the multiple sections of rods 210 is detachably connected to the mold shell 100 .
[0040] In this embodiment, adjacent rods 210 are plugged together, and one rod section 210 located at one end of the multi-section rod 210 is plugged together with the formwork 100. In other embodiments, the detachable connection between adjacent rods 210 can also be a threaded connection, and the detachable connection between one rod section 210 located at one end of the multi-section rod 210 and the formwork 100 can also be a threaded connection.
[0041] When operating the lever 200, if the lever 200 is long, several sections of the rod 210 can be removed to reduce the length of the lever 200 and improve the convenience of operation. If the lever 200 is short, several more sections of the rod 210 can be installed to improve the flexibility of the lever 200.
[0042] In this embodiment, the levers 200 include at least two levers 200 , and one section 210 of each lever 200 is detachably connected to the mold shell 100 .
[0043] Exemplarily, the lever 200 includes two levers 200, which are disposed on opposite sides of the mold shell 100, and one of the rods 210 in the two levers 200 is detachably connected to the mold shell 100. In the process of operating the lever 200, two operators stand on both sides of the mold shell 100 to operate a lever 200 respectively, which can improve work efficiency.
[0044] It is understandable that the number of the pull rods 200 can be more than three, depending on actual working conditions.
[0045] In this embodiment, the threading machine 10 also includes a socket sleeve 300, a die head assembly 400 and an advance and retract knife assembly 500. The socket sleeve 300 is arranged in the mold shell 100, the die head assembly 400 is arranged in the socket sleeve 300, the die head assembly 400 is used for processing threads, and the advance and retract knife assembly 500 can be movably arranged on the mold shell 100, and the advance and retract knife assembly 500 can be matched or released with the socket sleeve 300.
[0046] It should be noted that the die head assembly 400 is used for threading pipe fittings. In the advancing state, the advance and retract knife assembly 500 cooperates with the socket sleeve 300. When the lever 200 is pulled to make the mold shell 100 rotate around the pipe fitting, the advance and retract knife assembly 500 drives the socket sleeve 300 and the die head assembly 400 to rotate synchronously, and the die head assembly 400 processes threads on the pipe fitting; when the knife needs to be retracted, first release the cooperation between the advance and retract knife assembly 500 and the socket sleeve 300, move and adjust the position of the advance and retract knife assembly 500, and make the advance and retract knife assembly 500 cooperate with the socket sleeve 300 again, so that the advance and retract knife assembly 500 is in the retracting state, and then pull the lever 200 to make the mold shell 100 rotate in the opposite direction around the pipe fitting, and the advance and retract knife assembly 500 drives the socket sleeve 300 and the die head assembly 400 to rotate synchronously until the threading machine 10 is detached from the pipe fitting.
[0047] Please refer to Figure 3 In this embodiment, the advance and retract knife assembly 500 includes a finger ring 510 and a spring 520. The finger ring 510 is movably connected to the mold shell 100. The spring 520 is sleeved on the finger ring 510. Under the elastic force of the spring 520, one end of the finger ring 510 extends into the mold shell 100 and cooperates with the receiving sleeve 300. The other end of the finger ring 510 is provided with a handle 530.
[0048] The mold shell 100 is hollow inside, and a sleeve 110 is provided on the outer side of the mold shell 100. The thumb 510 is inserted into the sleeve 110. A first step 111 is provided in the sleeve 110, and a second step 511 is provided on the thumb 510. Both ends of the spring 520 abut against the first step 111 and the second step 511 respectively.
[0049] The end of the ring 510 away from the receiving sleeve 300 is inserted into the handle 530, and the handle 530 and the ring 510 are interference fit, and the handle 530 abuts against the end of the sleeve 110 away from the mold shell 100; a rectangular protrusion 531 is provided on the handle 530, and a rectangular groove 112 is provided at the end of the sleeve 110 away from the mold shell 100. The rectangular protrusion 531 and the rectangular groove 112 match in shape and can cooperate with each other. When the rectangular protrusion 531 and the rectangular groove 112 cooperate with each other, the ring 510 itself can be prevented from rotating irregularly, resulting in failure of power transmission.
[0050] In the present embodiment, one end of the ring finger 510 extending into the mold shell 100 is provided with a first abutting surface 512 and a second abutting surface 513, and the angle between the first abutting surface 512 and the second abutting surface 513 is an acute angle. The outer side surface of the receiving sleeve 300 is provided with a plurality of first bosses 310 at intervals along the circumferential direction, and the first abutting surface 512 and the second abutting surface 513 are both used for abutting against any first boss 310; when the first abutting surface 512 abuts against any first boss 310, the mold shell 100 can drive the receiving sleeve 300 to move synchronously; when the second abutting surface 513 abuts against any first boss 310, the ring finger 510 moves in a direction away from the receiving sleeve 300, and the mold shell 100 moves relative to the receiving sleeve 300.
[0051] The second abutment surface 513 is inclined relative to the first abutment surface 512. In the feeding state, the lever 200 is pulled to make the mold shell 100 rotate around the pipe fitting, the first abutment surface 512 abuts against the side of any first boss 310 and pushes the receiving sleeve 300 to rotate with the mold shell 100, and the die head assembly 400 rotates synchronously with the receiving sleeve 300. When the lever 200 is pulled to a certain angle, the mold shell 100 is rotated in the opposite direction, and the second abutment surface 513 is squeezed by the first boss 310, so that the finger 510 moves in the direction away from the receiving sleeve 300, and the first abutment surface 512 no longer abuts against the side of the first boss 310. At this time, the receiving sleeve 300 does not rotate synchronously with the mold shell 100; when the mold shell 100 is rotated in the opposite direction to an appropriate angle, the finger 510 moves toward the direction of the receiving sleeve 300 under the action of the spring 520, and the first abutment surface 512 abuts against the side of any first boss 310 again.
[0052] In the retracting state, pull the handle 530 outward and rotate it 180°, the thumb ring 510 rotates 180° along with the handle 530, release the handle 530, and under the action of the spring 520, the first abutting surface 512 abuts against the side surface of any first boss 310 again, and the subsequent operations are roughly the same as those in the advancing state, as long as the threading machine 10 is separated from the pipe fitting.
[0053] Please refer to Figure 4 , Figure 5In this embodiment, the die assembly 400 includes a die 410, a blade 420 and an end cover 430. The die 410 is partially disposed in the receiving sleeve 300, the blade 420 is inserted into the die 410, and the end cover 430 is connected to the die 410 to fix the blade 420.
[0054] One end of the die head 410 is provided with four blade bosses 411 along the circumferential direction, and gaps are provided between adjacent blade bosses 411. The gaps between adjacent blade bosses 411 facilitate the discharge of iron filings generated during the thread processing process; each blade boss 411 is provided with a blade groove 4111, and a blade 420 is installed in each blade groove 4111; each blade 420 is provided with a positioning groove 421, and accordingly, a plurality of positioning blocks 431 are provided on the end cover 430, and the end cover 430 is connected to the die head 410 by screws 440. When the end cover 430 is connected to the die head 410, the positioning blocks 431 on the end cover 430 cooperate with the positioning grooves 421 on the corresponding blades 420, thereby realizing the positioning and installation of the blades 420. The die head 410 is made of a light alloy material. A center hole matching the size of the corresponding pipe is opened in the center of the die head 410. By replacing different models of die heads 410 according to the different sizes of the pipes to be processed, thread processing can be performed on pipes of different sizes.
[0055] In this embodiment, the die head 410 is provided with at least two second bosses 450 along its own circumference, and each second boss 450 is provided with two connected first mating surfaces 451. The socket sleeve 300 is provided with a plurality of second mating surfaces 320 connected in sequence along the circumference, and the two first mating surfaces 451 of each second boss 450 are respectively matched with two adjacent second mating surfaces 320.
[0056] Exemplarily, the die head 410 is provided with four second bosses 450 along its own circumference, and the socket sleeve 300 is provided with eight second mating surfaces 320 connected in sequence along the circumference, so that the inner side surface of the socket sleeve 300 is roughly an octagonal structure, and the two first mating surfaces 451 of each second boss 450 are respectively fitted with the two adjacent second mating surfaces 320. When the socket sleeve 300 rotates, the die head 410 can rotate synchronously with the socket sleeve 300.
[0057] It is understandable that the die head 410 may be provided with two, three or more second bosses 450 along its own circumference, and the socket sleeve 300 may be provided with five, six or more second mating surfaces 320 along the circumference. As long as the two first mating surfaces 451 of each second boss 450 can fit with the two adjacent second mating surfaces 320, the die head 410 can rotate synchronously with the socket sleeve 300.
[0058] Please refer to Figure 6In this embodiment, a flange 330 is provided at one end of the receiving sleeve 300, and a first retaining spring 340 is provided at the other end of the receiving sleeve 300. The flange 330 and the first retaining spring 340 are respectively abutted against two sides of the mold shell 100, and a second retaining spring 360 is provided between the receiving sleeve 300 and the die head assembly 400.
[0059] A flange 330 is provided at one end of the socket sleeve 300, and a first annular groove 350 is provided at the other end of the socket sleeve 300. A first retaining spring 340 is provided in the first annular groove 350, and the flange 330 and the first retaining spring 340 are respectively abutted against two sides of the mold shell 100, so that the socket sleeve 300 is not easy to move relative to the mold shell 100 along the length direction of the pipe fitting, and can only rotate relative to the mold shell 100; the first retaining spring 340 cooperates with the flange 330 to position the socket sleeve 300, and the removal of the first retaining spring 340 requires specific tools.
[0060] A second annular groove 370 is provided in the receiving sleeve 300, and a dovetail-shaped groove 452 is provided on each second boss 450. A second retaining spring 360 is provided in the second annular groove 370, and the second retaining spring 360 is simultaneously engaged with the groove 452 on each second boss 450, so that the die head 410 is not easy to move relative to the receiving sleeve 300 along the length direction of the pipe fitting.
[0061] In this embodiment, an inclined step surface 453 is provided at the end of each second boss 450 facing away from the end cover 430. In the process of embedding the die head 410 into the receiving sleeve 300, the second retaining spring 360 is deformed when passing through the inclined step surface 453, and then the second retaining spring 360 cooperates with the retaining groove 452 to restore the deformation. The elasticity of the second retaining spring 360 enables the die head 410 to be more conveniently inserted into the receiving sleeve 300 and cooperate with the receiving sleeve 300, and the die head 410 can also be quickly removed from the receiving sleeve 300.
[0062] Please refer to Figure 7 In this embodiment, an oil pot 120 for storing lubricating oil is provided on the mold shell 100, and an oil outlet pipe 121 is provided on the oil pot 120. The oil outlet pipe 121 is connected to the inside of the oil pot 120, and one end of the oil outlet pipe 121 away from the oil pot 120 faces the pipe fitting.
[0063] The oil outlet pipe 121 is bent toward one side of the pipe fitting, so that the oil outlet pipe 121 is bent, and the end of the oil outlet pipe 121 away from the oil pot 120 is toward the pipe fitting. During the threading process of the pipe fitting, the lubricating oil in the oil pot 120 drips onto the surface of the pipe fitting through the oil outlet pipe 121 to prevent the blade 420 from overheating during the cutting process, thereby ensuring the processing efficiency.
[0064] In this embodiment, an oil outlet hole is provided in the oil pot 120, and the oil outlet hole is connected to the oil outlet pipe 121. A movable oil sealing ball 122 is provided in the oil pot 120, and the oil sealing ball 122 intermittently blocks the oil outlet hole during movement.
[0065] An inclined flow guiding surface 123 is provided in the oil pot 120 . The flow guiding surface 123 is in a cone shape. An oil outlet hole is opened at the bottom of the flow guiding surface 123 and is connected to the oil outlet pipe 121 .
[0066] During the rotation of the mold shell 100, the oil pot 120 rotates synchronously with the mold shell 100. During this process, the oil sealing ball 122 intermittently blocks the oil outlet hole. When the oil sealing ball 122 blocks the oil outlet hole, the oil outlet pipe 121 stops adding lubricating oil to the surface of the pipe. When the oil sealing ball 122 releases the blockage of the oil outlet hole, the oil outlet pipe 121 adds lubricating oil to the surface of the pipe. The setting of the oil sealing ball 122 can achieve the effect of intermittent oil supply and lubrication.
[0067] A detachable oil pot plug 124 is also provided on the top of the oil pot 120. By opening the oil pot plug 124, lubricating oil can be added to the oil pot 120. In some embodiments, a liquid level line is also provided in the oil pot 120 to observe the amount of lubricating oil added.
[0068] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.
Claims
1. A threading machine that is easy to advance and retract the knife, characterized in that: It includes a mold shell, a socket sleeve, a die head assembly and an advance and retract knife assembly. The socket sleeve is arranged in the mold shell, the die head assembly is arranged in the socket sleeve, the die head assembly is used for processing threads, and the advance and retract knife assembly can be movably arranged on the mold shell, and the advance and retract knife assembly can be matched or released with the socket sleeve.
2. The threading machine that facilitates advance and retreat of the knife according to claim 1 is characterized in that: The knife advance and retract assembly includes a finger and a spring. The finger is movably connected to the mold shell. The spring is sleeved on the finger. Under the elastic force of the spring, one end of the finger extends into the mold shell and cooperates with the receiving sleeve. The other end of the finger is provided with a handle.
3. The threading machine that facilitates advance and retreat of the knife according to claim 2 is characterized in that: A sleeve is provided on the outer side of the mold shell, the finger is inserted into the sleeve, a first step is provided in the sleeve, a second step is provided on the finger, and two ends of the spring abut against the first step and the second step respectively.
4. The threading machine for easy advance and retreat of the knife according to claim 3 is characterized in that: A rectangular protrusion is arranged on the handle, and a rectangular groove is arranged on one end of the sleeve away from the mold shell. The rectangular protrusion and the rectangular groove match in shape and can cooperate with each other.
5. The threading machine that facilitates advance and retreat of the knife according to claim 2, characterized in that: One end of the finger extending into the mold shell is provided with a first abutment surface and a second abutment surface, the angle between the first abutment surface and the second abutment surface is an acute angle, and the outer side surface of the receiving sleeve is provided with a plurality of first bosses at intervals along the circumferential direction, and the first abutment surface and the second abutment surface are both used for abutment with any of the first bosses; When the first abutting surface abuts against any of the first bosses, the mold shell can drive the receiving sleeve to move synchronously; when the second abutting surface abuts against any of the first bosses, the finger moves away from the receiving sleeve, and the mold shell moves relative to the receiving sleeve.
6. The threading machine that facilitates advance and retreat of the knife according to claim 2, characterized in that: One end of the finger ring away from the receiving sleeve is inserted into the handle, and the handle and the finger ring are interference fit.
7. The threading machine with convenient advance and retreat of the knife according to claim 1, characterized in that: A flange is provided at one end of the receiving sleeve, and a first retaining spring is provided at the other end of the receiving sleeve. The flange and the first retaining spring are respectively abutted against two sides of the mold shell, and a second retaining spring is provided between the receiving sleeve and the die head assembly.
8. The threading machine with convenient advance and retreat of the knife according to claim 1, characterized in that: The die head assembly comprises a die head, a blade and an end cover, the die head portion is arranged in the receiving sleeve, the blade is plugged into the die head, and the end cover is connected to the die head to fix the blade.
9. The threading machine for easy advance and retreat of the knife according to claim 8, characterized in that: The die head is provided with at least two second bosses along its circumference, each of the second bosses is provided with two connected first mating surfaces, and the receiving sleeve is provided with a plurality of second mating surfaces connected in sequence along the circumference, and the two first mating surfaces of each second boss are respectively mated with two adjacent second mating surfaces.
10. The threading machine with convenient advance and retreat of the knife according to claim 9, characterized in that: An end of each of the second bosses away from the end cover is provided with an inclined step surface.