Manual rotary pipe cutting machine

Abstract

The present invention relates to a manual rotary pipe cutting machine and a pipe cutting method, and belongs to the field of pipe cutting. The present invention includes a pipe cutting machine frame, and the pipe cutting machine frame includes a lower tool holder, an upper tool holder, a feed screw and a feed nut. The lower tool holder is connected to the upper tool holder through the feed screw and the feed nut. Its structural characteristics are: the manual rotary pipe cutting machine also includes a supporting mechanism and a driving mechanism. The pipe cutting machine frame and the supporting mechanism are both connected to the driving mechanism. The driving mechanism includes a driving claw and a driving rod. The driving rod is connected to the driving claw, and the driving claw cooperates with the pipe cutting machine frame. A guide head, a first slope section, and a second slope section are sequentially arranged in the driving claw. The driving mechanism uses the second driving shaft as a fulcrum, the driving rod as a force arm, and the driving claw as a force-bearing arm to form a labor-saving driving structure to drive the pipe cutting machine frame to rotate and cut.

Description

Technical Field

[0001] The invention relates to a manual rotary pipe cutting machine and belongs to the field of pipe cutting. Background Art

[0002] In the prior art, electric pipe cutters are generally used for cutting. The installation location of gas pipelines is relatively special, and sometimes the pipelines need to be installed in flammable and explosive environments such as gas stations. The sparks generated by the electric pipe cutter when it is working will cause great risks. At the same time, when construction is carried out in noise-prohibited areas, the noise generated by the electric pipe cutter when it is working also makes it impossible to use it.

[0003] In areas where electric pipe cutting machines and manual cutting are not applicable, manual articulated rotary pipe cutting machines are generally used. They are mainly composed of a cutter frame, a wrench and a blade. During use, personnel insert the wrench into a specific position of the cutter frame, rotate the cutter frame to a certain angle, then remove the wrench, find a new wrench position to switch, insert it and then rotate it, and continuously remove and install the wrench to repeat this process for cutting. The operation method is very clumsy, but as the size of the pipe continues to increase, the appearance and weight of the articulated rotary pipe cutting machine continue to increase, and this cutting method will appear very inconvenient. During use, personnel will spend physical strength and time on switching the wrench position, resulting in low efficiency and high labor intensity.

[0004] For example, CN 213672135 U discloses a manual rotary pipe cutter for a 22-inch gas pipeline. When using the manual pipe cutter, a wrench needs to be inserted into a lever of a frame to rotate the pipe cutter for cutting. However, it is relatively laborious to apply force in the vertical direction of the lever for cutting. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a manual rotary pipe cutting machine with a reasonable structural design.

[0006] The technical solution adopted by the present invention to solve the above problems is: the manual rotary pipe cutting machine includes a pipe cutting machine frame, the pipe cutting machine frame includes a lower knife frame, an upper knife frame, a feed screw and a feed nut, the lower knife frame is connected to the upper knife frame through the feed screw and the feed nut, and its structural characteristics are: the manual rotary pipe cutting machine also includes a support mechanism and a driving mechanism, the driving mechanism is connected to the support mechanism, the pipe cutting machine frame is used in conjunction with the driving mechanism, the driving mechanism includes a driving claw and a driving rod, the driving rod is connected to the driving claw, the driving claw cooperates with the pipe cutting machine frame, and the driving claw is sequentially provided with a guide head, a first slope section and a second slope section. The driving mechanism uses the second driving shaft as a fulcrum, the driving rod as a force arm, and the driving claw as a force arm, forming a labor-saving driving structure to drive the pipe cutting machine frame to rotate and cut.

[0007] Furthermore, the pipe cutting machine frame also includes a clamping block, a clamping slot, a cutting blade, a cutting blade shaft and a roller. The lower blade frame and the upper blade frame are both provided with a clamping block and a cutting blade shaft. The clamping slot is provided on the clamping block. The cutting blade and the roller are both provided on the cutting blade shaft. A roller is provided on each side of the cutting blade. By providing the roller, the cutting blade can directly contact the pipe in the case of single-sided cutting, thereby reducing resistance.

[0008] Further, the first slope section includes a first slope and a first clamping shaft, the second slope section includes a second slope and a second clamping shaft, the guide head, the first clamping shaft, the first slope, the second clamping shaft and the second slope are arranged in sequence, and the first clamping shaft and the second clamping shaft are both matched with the clamping slot. The first clamping shaft and the second clamping shaft can be matched with the clamping slot and clamped.

[0009] Furthermore, the pipe cutting machine frame further comprises a claw, a claw shaft and a torsion spring, wherein the claw shaft is arranged on the upper tool holder, or the upper tool holder and the lower tool holder are both provided with a claw shaft, the claw and the torsion spring are both arranged on the claw shaft, one end of the torsion spring abuts against the claw, and the other end of the torsion spring abuts against the upper tool holder, and the claw cooperates with the cutting blade, so as to clamp the pipe to be cut and avoid relative movement between the pipe cutting machine frame and the pipe to be cut.

[0010] Furthermore, the feed nut is installed on the feed screw and is tightened by a wrench.

[0011] Furthermore, there are two feed screws, the upper end of one feed screw is hinged to the lower tool holder, and the lower end of the feed screw is connected to the upper tool holder through a feed nut, and the lower end of the other feed screw is hinged to the upper tool holder, and the upper end of the feed screw is connected to the lower tool holder through a feed nut. The pipeline can be fixed conveniently.

[0012] Furthermore, the support mechanism includes a support frame, a support sleeve, a chain nut, a chain screw, a chain, a connecting buckle, a first support seat and a second support seat, wherein the support sleeve is arranged on the support frame, the support sleeve is connected to the support rod, the first support seat and the second support seat are respectively arranged at both ends of the support frame, the chain nut is installed on the chain screw, the chain screw penetrates the first support seat, one end of the chain screw is connected to the connecting buckle, the connecting buckle is connected to one end of the chain, and the other end of the chain cooperates with the second support seat. The support mechanism can be used to support the driving mechanism when cutting the pipeline, and is the fulcrum when the driving mechanism acts, wherein the chain is used to hold the pipeline tightly to prevent the support mechanism from sliding left and right relative to the pipeline, and the support rod is in contact with the ground to prevent the support mechanism from rotating.

[0013] Furthermore, the support frame is provided with a top, which can tighten the pipeline and further prevent the support frame from rotating during cutting.

[0014] Furthermore, a semicircular gasket groove is provided on the first support seat, and a semicircular gasket is provided on the chain screw, and the semicircular gasket is located in the semicircular gasket groove for fixing the chain screw.

[0015] Furthermore, a chain slot is provided on the second support seat, and the other end of the chain is located in the chain slot.

[0016] Furthermore, the chain slot includes an upper slot and a lower slot, and the upper slot and the lower slot are respectively arranged on both sides of the second support seat, and the upper slot includes a vertical slot portion and a horizontal slot portion, and the vertical slot portion is perpendicular to the horizontal slot portion, and the vertical slot portion is connected to the lower slot, and the lower slot is arranged in a U-shaped structure.

[0017] Compared with the prior art, the present invention has the following advantages: the support mechanism is fixed to the pipe to be cut, the drive mechanism is connected to the support mechanism, and the pipe cutting frame is used in conjunction with the drive mechanism. The drive mechanism uses the second drive shaft as a fulcrum, the drive rod as a force arm, and the drive claw as a force arm, forming a labor-saving drive structure to drive the pipe cutting frame to rotate and cut. The support mechanism is used to support the pipe when cutting the pipe. At the same time, the pipe is held tightly by the set chain, and the top tip presses the pipe tightly. The support rod is in contact with the ground to prevent the support mechanism from rotating relative to the pipe when cutting with force.

[0018] The present application combines the lever principle and the ratchet structure, and through the ingenious combination of the support frame, the driving claw and the driving rod, the pipe cutting is simple, more labor-saving and highly practical; the support frame is firm and solid, the driving claw is flexible and convenient, and can achieve spark-free cold cutting, safe and explosion-proof, and meet the needs of operations in different environments in various fields. The four blades rotate 360° at the same time, and the cutting noise is small. The pipe incision is smooth and no debris is generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a manual rotary pipe cutting machine according to an embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of a pipe cutting machine frame according to an embodiment of the present invention.

[0021] Figure 3 It is a schematic diagram of the exploded structure of the pipe cutting machine frame according to an embodiment of the present invention.

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of a pipe cutting machine frame according to an embodiment of the present invention.

[0023] Figure 5 It is a schematic cross-sectional structure diagram of a pipe cutting machine frame according to an embodiment of the present invention.

[0024] Figure 6It is a schematic diagram of the three-dimensional structure of the support mechanism of an embodiment of the present invention.

[0025] Figure 7 yes Figure 6 Schematic diagram of the enlarged structure of part I in FIG.

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the support mechanism of an embodiment of the present invention.

[0027] Fig. 9 It is a schematic cross-sectional structure diagram of a support mechanism according to an embodiment of the present invention.

[0028] Fig.10 The manual rotary pipe cutting machine of the present invention is a schematic diagram of the pipe cutting state structure. Figure 1 .

[0029] Fig.11 The manual rotary pipe cutting machine of the present invention is a schematic diagram of the pipe cutting state structure. Figure 2 .

[0030] Fig.12 The manual rotary pipe cutting machine of the present invention is a schematic diagram of the pipe cutting state structure. Figure 3 .

[0031] Fig.13 The manual rotary pipe cutting machine of the present invention is a schematic diagram of the pipe cutting state structure. Figure 4 .

[0032] Fig.14 The manual rotary pipe cutting machine of the present invention is a schematic diagram of the pipe cutting state structure. Figure 5 .

[0033] Fig.15 The manual rotary pipe cutting machine of the present invention is a schematic diagram of the pipe cutting state structure. Figure 6 .

[0034] Fig.16 The manual rotary pipe cutting machine of the present invention is a schematic diagram of the pipe cutting state structure. Figure 7 .

[0035] Description of labels: pipe cutting frame A, support mechanism B, driving mechanism C, pipeline D,

[0036] Lower tool holder A1, upper tool holder A2, feed screw A3, feed nut A4, clamping block A5, clamping slot A6, cutting blade A7, cutting blade shaft A8, roller A9, claw A10, claw shaft A11, torsion spring A12, wrench A13,

[0037] Support frame B1, support rod B2, support sleeve B3, top B4, semicircular gasket B5, chain nut B6, chain screw B7, chain B8, connecting buckle B9, first support seat B10, second support seat B11, semicircular gasket groove B12, chain slot B13, upper slot B14, lower slot B15, slot vertical part B16, slot horizontal part B17,

[0038] Driving claw C1, driving rod C2, guide head C3, first slope section C4, second slope section C5, first slope C6, second slope C7, first clamping axis C8, second clamping axis C9, first driving axis C10, second driving axis C11. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0040] Example

[0041] See also Figures 1 to 16 As shown, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, if there are references to terms such as "upper", "lower", "left", "right", "middle" and "one" in this specification, they are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0042] The manual rotary pipe cutting machine in this embodiment includes a pipe cutting frame A, a supporting mechanism B and a driving mechanism C. The supporting mechanism B is fixed to the pipe to be cut, and the driving mechanism C is connected to the supporting mechanism B. The pipe cutting frame A and the driving mechanism C are used in conjunction with each other.

[0043] The pipe cutting machine frame A in this embodiment includes a lower tool holder A1, an upper tool holder A2, a feed screw A3, a feed nut A4, a clamping block A5, a clamping groove A6, a cutting blade A7, a cutting shaft A8, a roller A9, a clamping claw A10, a clamping claw shaft A11 and a torsion spring A12. The lower tool holder A1 is connected to the upper tool holder A2 through the feed screw A3 and the feed nut A4. The feed nut A4 is installed on the feed screw A3 and is tightened by a wrench A13. When the diameter of the pipeline D is large, a clamping block A5 is provided on the feed screw A3.

[0044] In this embodiment, the lower tool holder A1 and the upper tool holder A2 are both provided with a clamping block A5 and a cutter shaft A8, the clamping slot A6 is provided on the clamping block A5, the cutting blade A7 and the roller A9 are both provided on the cutter shaft A8, and a roller A9 is provided on each side of the cutting blade A7.

[0045] The claw shaft A11 in this embodiment is arranged on the upper tool holder A2, or the claw shaft A11 is arranged on both the upper tool holder A2 and the lower tool holder A1, the claw A10 and the torsion spring A12 are both arranged on the claw shaft A11, one end of the torsion spring A12 abuts against the claw A10, and the other end of the torsion spring A12 abuts against the upper tool holder A2, and the claw A10 cooperates with the cutting blade A7.

[0046] There are two feed screws A3 in this embodiment, the upper end of one of the feed screws A3 is hinged to the lower tool holder A1, and the lower end of the feed screw A3 is connected to the upper tool holder A2 through a feed nut A4, and the lower end of the other feed screw A3 is hinged to the upper tool holder A2, and the upper end of the feed screw A3 is connected to the lower tool holder A1 through a feed nut A4.

[0047] The support mechanism B in this embodiment includes a support frame B1, a support sleeve B3, a chain nut B6, a chain screw B7, a chain B8, a connecting buckle B9, a first support seat B10 and a second support seat B11. The support sleeve B3 is arranged on the support frame B1, and the support sleeve B3 is connected to the support rod B2. The first support seat B10 and the second support seat B11 are respectively arranged at both ends of the support frame B1. The chain nut B6 is installed on the chain screw B7, and the chain screw B7 penetrates the first support seat B10. One end of the chain screw B7 is connected to the connecting buckle B9, and the connecting buckle B9 is connected to one end of the chain B8. The other end of the chain B8 cooperates with the second support seat B11, and a top B4 is provided on the support frame B1.

[0048] In this embodiment, a semicircular gasket groove B12 is provided on the first support seat B10, a semicircular gasket B5 is provided on the chain screw B7, and the semicircular gasket B5 is located in the semicircular gasket groove B12; a chain slot B13 is provided on the second support seat B11, and the other end of the chain B8 is located in the chain slot B13.

[0049] The chain slot B13 in this embodiment includes an upper slot B14 and a lower slot B15, and the upper slot B14 and the lower slot B15 are respectively arranged on both sides of the second support seat B11, and the upper slot B14 includes a slot vertical portion B16 and a slot horizontal portion B17, and the slot vertical portion B16 is perpendicular to the slot horizontal portion B17, and the slot vertical portion B16 is connected to the lower slot B15, and the lower slot B15 is arranged in a U-shaped structure.

[0050] The driving mechanism C in this embodiment includes a driving claw C1 and a driving rod C2. The driving rod C2 is connected to the driving claw C1. The driving claw C1 cooperates with the pipe cutting machine frame A. A guide head C3, a first slope section C4 and a second slope section C5 are sequentially arranged in the driving claw C1.

[0051] In this embodiment, the first slope section C4 includes a first slope C6 and a first clamping axis C8, the second slope section C5 includes a second slope C7 and a second clamping axis C9, the guide head C3, the first clamping axis C8, the first slope C6, the second clamping axis C9 and the second slope C7 are arranged in sequence, and the first clamping axis C8 and the second clamping axis C9 both cooperate with the clamping groove A6.

[0052] The pipe cutting method of the manual rotary pipe cutting machine in this embodiment is as follows:

[0053] Cut pipe D assembly, such as Fig.10 As shown, first place the upper tool holder A2 provided with the clamping claw A10 above the pipe D. By providing the clamping claw A10, the upper tool holder A2 can stand on the pipe D more stably. Connect the lower tool holder A1 with the upper tool holder A2 through the feed screw A3 and the feed nut A4, and adjust the cutting position.

[0054] Use spanner A13 to properly tighten the feed nuts A4 on both sides, so that the lower tool holder A1 and the upper tool holder A2 are close to each other, so that the cutting blade A7 is pressed on the pipe D, and the blade on the cutting blade A7 is tangent to the pipe D.

[0055] Then install the support mechanism B, such as Fig.11 As shown, use chain B8 to tie support frame B1 to pipe D, adjust the distance between support frame B1 and adjacent surface of pipe cutting frame A to about 58.5 mm, then insert one end of support rod B2 into support sleeve B3, support the other end of support rod B2 to the ground, lock support rod B2 with bolts, and then use wrench A13 to tighten chain nut B6 to lock the chain.

[0056] When installing the supporting mechanism B on the pipe D, pass the chain B8 around the pipe D, insert one of the two adjacent links at the other end of the chain B8 into the vertical part B16 of the card slot, and insert the other link into the horizontal part B17 of the card slot, turn the chain nut B6, and tighten the chain B8 through the chain screw B7, so that the chain B8 contacts the outer wall of the pipe D, and the outer wall of the pipe D contacts the top B4. The cooperation between the top B4 and the chain B8 can hold the pipe D tightly to prevent the pipe D from moving sideways during cutting, insert one end of the support rod B2 into the support sleeve B3, and the other end of the support rod B2 supports the ground, which can play a supporting role when the pipe D is cut forcefully.

[0057] Finally, the driving rod C2 is hinged to the driving claw C1 through the first driving shaft C10, and is hinged to the supporting frame B1 through the second driving shaft C11. Fig.12 As shown, the manual rotary pipe cutting machine has been installed and is ready for cutting. The cutting process is as follows:

[0058] First, the driving rod C2 is pushed upward, and the driving claw C1 is guided to slide by the arc-shaped guide head C3 at the front end, so that the first clamping axis C8 on the driving claw C1 is clamped with the clamping groove A6.

[0059] At this time, the driving rod C2 is pulled downward, and the driving rod C2 drives the driving claw C1 to rotate through the first driving shaft C10, and the driving claw C1 drives the pipe cutting frame A to rotate synchronously, and the cutting blade A7 cuts the pipe at this time.

[0060] When the driving rod C2 moves to the bottom and can no longer apply force, the driving rod C2 needs to be pushed upward again, so that the driving claw C1 naturally slides into the second slope section C5 through the first slope C6 inside it, so that the second clamping shaft C9 is clamped with the clamping groove A6.

[0061] After the clamping, the driving rod C2 is pulled downward again to drive the pipe cutting frame A to rotate again.

[0062] When the driving rod C2 moves to the bottom again and can no longer apply force, repeat the above steps.

[0063] During cutting, when the pipe cutting machine frame A rotates a certain number of times, the cutting groove of the pipe D will deepen due to the cutting action of the cutting blade A7, and the gap between the cutting blade A7 and the pipe will become larger. At this time, it is necessary to stop cutting and use the wrench A13 to evenly tighten the locking nuts A4 on both sides so that the cutting blade A7 contacts the pipe again before continuing cutting.

[0064] Specifically, the lower tool holder A1 and the upper tool holder A2 are both designed with arc structures and have a number of blocks A5 on the outside. The lower tool holder A1 and the upper tool holder A2 are combined in a manner of being rotated 180° relative to each other. The lower tool holder A1 and the upper tool holder A2 are connected on both sides by two feed screws A3 and feed nuts A4 respectively. The lower tool holder A1 and the upper tool holder A2 are connected to each other end to end to form a ring.

[0065] The wrench A13 has an equally divided convex connector that matches the equally divided concave connectors of the feed nut A4 and the chain nut B6. It is small and light and can easily adjust the feed depth.

[0066] The cutting blade A7 is rotatably connected to the inner side of the lower blade holder A1 and the upper blade holder A2 through the cutting blade shaft A8. A pair of cutting blades A7 are symmetrically arranged on the lower blade holder A1 and the upper blade holder A2. Rollers A9 are arranged on both sides of the cutting blade A7 and are also connected through the cutting blade shaft A8.

[0067] A clamping claw A10 is provided above the position of the lower tool holder A1 and the upper tool holder A2 corresponding to the cutting blade A7. The clamping claw A10 is symmetrically arranged with the cutting blade A7. The clamping claw A10 is connected to the lower tool holder A1 and the upper tool holder A2 through a light straight groove elastic cylindrical pin, and a torsion spring is used to give it a certain clamping force, so as to maintain the relative position of the lower tool holder A1 and the upper tool holder A2 and the pipeline D.

[0068] The support frame B1 is clamped on the pipe D through the chain B8 to prevent lateral movement, and supports the ground through the support rod B2, forming a stable and firm oblique support structure.

[0069] The driving claw C1 has a first slope C6 and a second slope C7, and has a first clamping axis C8 and a second clamping axis C9 inside the first slope C6 and the second slope C7, which can just fit into the semicircular clamping groove A6 set on the clamping block A5.

[0070] The driving rod C2 is hinged to the driving claw C1 through the first driving shaft C10 and is hinged to the supporting frame B1 through the second driving shaft C11. The three form a lever structure, that is, the supporting frame B1 is the fulcrum, the position of the driving rod C2 is the force application point, and the position of the driving claw C1 is the force receiving point. At the same time, the pipe cutting frame A is like a ratchet. The driving claw C1 hooks the block A5 of the pipe cutting frame A, and the driving rod C2 swings back and forth up and down to rotate the pipe cutting frame A to cut the pipe D. The entire use process is more labor-saving.

[0071] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles of the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A manual rotary pipe cutting machine, comprising a pipe cutting machine frame (A), wherein the pipe cutting machine frame (A) comprises a lower tool frame (A1), an upper tool frame (A2), a feed screw (A3) and a feed nut (A4), wherein the lower tool frame (A1) is connected to the upper tool frame (A2) via the feed screw (A3) and the feed nut (A4), and wherein: The manual rotary pipe cutting machine further comprises a supporting mechanism (B) and a driving mechanism (C), wherein the driving mechanism (C) is connected to the supporting mechanism (B), the pipe cutting frame (A) is used in conjunction with the driving mechanism (C), the driving mechanism (C) comprises a driving claw (C1) and a driving rod (C2), the driving rod (C2) is connected to the driving claw (C1), the driving claw (C1) is matched with the pipe cutting frame (A), a guide head (C3), a first slope section (C4) and a second slope section (C5) are sequentially arranged in the driving claw (C1), the pipe cutting frame (A) further comprises a clamping block (A5), a clamping groove (A6), a cutting blade (A7), a cutting blade shaft (A8) and a roller (A9), the lower blade frame (A1) and the upper blade frame (A1) are connected to ... The knife holder (A2) is provided with a clamping block (A5) and a cutting knife shaft (A8), the clamping slot (A6) is provided on the clamping block (A5), the cutting blade (A7) and the roller (A9) are provided on the cutting knife shaft (A8), a roller (A9) is provided on each side of the cutting blade (A7), the first slope section (C4) includes a first slope (C6) and a first clamping shaft (C8), the second slope section (C5) includes a second slope (C7) and a second clamping shaft (C9), the guide head (C3), the first clamping shaft (C8), the first slope (C6), the second clamping shaft (C9) and the second slope (C7) are provided in sequence, and the first clamping shaft (C8) and the second clamping shaft (C9) are both matched with the clamping slot (A6); The support mechanism (B) comprises a support frame (B1), a support sleeve (B3), a chain nut (B6), a chain screw (B7), a chain (B8), a connecting buckle (B9), a first support seat (B10) and a second support seat (B11); the support sleeve (B3) is arranged on the support frame (B1); the support sleeve (B3) is connected to the support rod (B2); the first support seat (B10) and the second support seat (B11) are respectively arranged at two ends of the support frame (B1); the chain nut (B6) is installed on the chain screw (B7); the chain screw (B7) penetrates the first support seat (B10); one end of the chain screw (B7) is connected to the connecting buckle (B9); the connecting buckle (B9) is connected to one end of the chain (B8); the other end of the chain (B8) cooperates with the second support seat (B11); The cutting steps are as follows: First, the driving rod (C2) is pushed upward, and the driving claw (C1) is guided and slid by the arc-shaped guide head (C3) at the front end, so that the first clamping shaft (C8) on the driving claw (C1) is clamped with the clamping groove (A6); At this time, the driving rod (C2) is pulled downward, and the driving rod (C2) drives the driving claw (C1) to rotate through the first driving shaft (C10), and the driving claw (C1) synchronously drives the pipe cutting frame (A) to rotate, and the cutting blade (A7) cuts the pipe; When the driving rod (C2) moves to the bottom and can no longer apply force, the driving rod (C2) needs to be pushed upward again, so that the driving claw (C1) naturally slides into the second slope section (C5) through the first slope (C6) inside the driving rod (C1), so that the second clamping shaft (C9) is clamped with the clamping groove (A6); After the connection is completed, pull the drive rod (C2) downward again to drive the pipe cutting frame (A) to rotate again; When the driving rod (C2) moves to the bottom again and can no longer apply force, repeat the above steps.

2. The manual rotary pipe cutting machine according to claim 1, characterized in that: The pipe cutting machine frame (A) further comprises a claw (A10), a claw shaft (A11) and a torsion spring (A12); the claw shaft (A11) is arranged on the upper tool holder (A2), or the upper tool holder (A2) and the lower tool holder (A1) are both provided with the claw shaft (A11); the claw (A10) and the torsion spring (A12) are both arranged on the claw shaft (A11); one end of the torsion spring (A12) abuts against the claw (A10), and the other end of the torsion spring (A12) abuts against the upper tool holder (A2); and the claw (A10) cooperates with the cutting blade (A7).

3. The manual rotary pipe cutting machine according to claim 1, characterized in that: The number of the feed screws (A3) is two, the upper end of one of the feed screws (A3) is hinged to the lower tool holder (A1), and the lower end of the feed screw (A3) is connected to the upper tool holder (A2) via a feed nut (A4), and the lower end of the other feed screw (A3) is hinged to the upper tool holder (A2), and the upper end of the feed screw (A3) is connected to the lower tool holder (A1) via a feed nut (A4).

4. The manual rotary pipe cutting machine according to claim 1, characterized in that: The support frame (B1) is provided with a top (B4).

5. The manual rotary pipe cutting machine according to claim 1, characterized in that: A semicircular gasket groove (B12) is provided on the first support seat (B10), a semicircular gasket (B5) is provided on the chain screw rod (B7), and the semicircular gasket (B5) is located in the semicircular gasket groove (B12).

6. The manual rotary pipe cutting machine according to claim 1, characterized in that: The second support seat (B11) is provided with a chain slot (B13), and the other end of the chain (B8) is located in the chain slot (B13).

7. The manual rotary pipe cutting machine according to claim 6, characterized in that: The chain slot (B13) comprises an upper slot (B14) and a lower slot (B15), the upper slot (B14) and the lower slot (B15) being respectively arranged on two sides of the second support seat (B11), the upper slot (B14) comprising a slot vertical portion (B16) and a slot horizontal portion (B17), the slot vertical portion (B16) and the slot horizontal portion (B17) being arranged vertically, and the slot vertical portion (B16) is connected to the lower slot (B15), and the lower slot (B15) is arranged in a U-shaped structure.

8. The manual rotary pipe cutting machine according to claim 1, characterized in that: The feed nut (A4) is installed on the feed screw (A3) and is tightened by a wrench (A13).

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