A gear type traceless pipe wrench and method

Abstract

The present invention discloses a gear - type traceless pipe wrench and a method. The traceless pipe wrench includes a jaw and a handle. The jaw includes an upper jaw assembly and a lower jaw assembly, and the handle includes a rocking handle assembly. One end of the upper jaw assembly is hinged to the rocking handle assembly, and the other end is hinged to the lower jaw assembly. A large gear is fixedly arranged at the other end of the lower jaw assembly. A small gear is arranged at the hinge joint between the upper jaw assembly and the rocking handle assembly. A return ratchet is arranged to the right of the small gear. Both the upper jaw assembly and the lower jaw assembly include clamping parts, and rubber pads are arranged on the inner side walls of the clamping parts. The working method of the traceless pipe wrench completes the construction of the pipe through multiple steps. The traceless pipe wrench of the present invention has a large clamping force and a small probability of slipping during construction due to the gear combination; the setting of the rubber pad effectively protects the surface of the pipe; the setting of the return ratchet enables the traceless pipe wrench to both release the pipe from its jaws and not disengage from the pipe when returning, and can quickly exert force when tightening the pipe, saving time and effort.

Description

Technical Field

[0001] The present invention relates to a pipe wrench and a method, and in particular to a gear type traceless pipe wrench and a method. Background Art

[0002] A pipe wrench is a commonly used tool for pipeline installation and repair, and is used to rotate metal pipes or other cylindrical pipe fittings; due to its large biting force and convenient use, the pipe wrench has been widely used in places with low installation requirements such as ordinary galvanized pipes. Existing pipe wrenches include various types: toothed, chain type, water pump pliers, belt wrench, etc., but existing pipe wrenches also have some fatal weaknesses. Since the above types of pipe wrenches obtain anti-loosening torque by using sharp jaws for biting, existing pipe wrenches cannot clamp and rotate ceramic pipe fittings, thin-walled pipe fittings, plastic pipe fittings, etc., otherwise the pipe materials are extremely likely to be deformed and distorted. If the pipeline adopts a factory prefabricated anti-corrosion process, using an existing pipe wrench for installation will also produce bite marks on the pipeline, damaging the surface of the pipe fittings.

[0003] At present, factory pre-coated pipes are widely used in the gas industry. Factory pre-coated pipes include pre-coated galvanized pipes and epoxy-coated seamless steel pipes. When these pipes are installed using existing ordinary pipe wrenches, bite marks will be generated on the pipe surface, resulting in damage to the anti-corrosion layer. The damaged anti-corrosion layer is very difficult to repair to the original anti-corrosion level, and color differences will occur after the anti-corrosion layer is repaired. For pipelines located indoors of residential users, using existing pipe wrenches for installation will not only damage the anti-corrosion layer outside the pipeline and affect the service life of the pipeline, but also affect the appearance of the pipeline due to color differences after the anti-corrosion layer is repaired. And when existing ordinary pipe wrenches operate on thin-walled stainless steel pipes, PE pipes, PPR pipes, and pipes with higher hardness (such as 304 stainless steel), etc., since ordinary pipe wrenches cannot produce effective bite marks, the operation effect of ordinary pipe wrenches is poor.

[0004] In addition, due to the influence of external environmental factors on the pipeline to be tightened, the single rotation stroke of the pipeline when being tightened by the pipe wrench is limited. The pipe wrench cannot complete the tightening of the pipeline by just one turn. The jaws of the pipe wrench need to release the pipeline multiple times, readjust the relative position of the pipe wrench on the pipeline and then bite the pipeline for the next turn, and complete the tightening of the pipeline through multiple turns of the pipe wrench. The pipe wrench of the prior art is very easy to disengage from the pipeline when releasing the pipeline, and it is necessary to reinstall the pipe wrench on the pipeline. The installation of the pipe wrench is very complicated and inconvenient under multiple turn operations, and the tightening process of the pipeline is intermittent, and it takes a long time to tighten the pipeline, which is time-consuming and laborious. Summary of the Invention

[0005] In order to solve the deficiencies of the above technologies, the present invention provides a gear type traceless pipe wrench and a method.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a gear-type seamless pipe wrench, which includes a jaw and a handle. The jaw includes an upper jaw assembly and a lower jaw assembly, and the handle includes a crank assembly. One end of the upper jaw assembly is hinged to the crank assembly, and the other end is hinged to the lower jaw assembly. A large gear is fixedly arranged at the other end of the lower jaw assembly. A small gear that cooperates with the large gear is arranged at the hinge between the upper jaw assembly and the crank assembly, and the small gear is fixedly arranged on the crank assembly. A return ratchet is arranged to the right of the small gear, and the return ratchet is arranged on the crank assembly;

[0007] Both the upper jaw assembly and the lower jaw assembly include a clamping portion, and rubber pads are arranged on the inner side walls of the clamping portions;

[0008] The upper jaw assembly includes an upper clamping portion and an upper mounting portion, and the upper clamping portion is located inside the upper mounting portion. A positioning post is fixedly inserted in the right part of the upper mounting portion, and a limiting platform protrudes outward from the outer side wall of the right part of the upper mounting portion;

[0009] The upper jaw assembly is formed by stacking an upper jaw plate and a plurality of thickening plates A. There are two upper jaw plates and multiple thickening plates A, and the multiple thickening plates A are arranged between the two upper jaw plates;

[0010] The lower jaw assembly includes a lower clamping portion and a lower mounting portion, and the lower clamping portion is located inside the lower mounting portion;

[0011] The lower jaw assembly is formed by stacking a lower jaw plate, thickening plates B, and thickening plates C. There is one lower jaw plate, and the thickening plates B and C are symmetrically distributed on both sides of the lower jaw plate from the inside to the outside in sequence, and both the thickening plates B and C are even-numbered;

[0012] The large gear is fixedly arranged at the right end of the lower jaw plate;

[0013] The crank assembly includes a crank mounting portion and a gripping portion, and the crank mounting portion is located on the left side of the gripping portion;

[0014] The crank assembly is formed by stacking a crank plate and a crank rubber filling plate. There are two crank plates and one crank rubber filling plate. The two crank plates are symmetrically arranged on both sides of the crank rubber filling plate, and the return ratchet is arranged on one of the crank plates;

[0015] The small gear is fixedly arranged at the left end of the crank rubber filling plate. Positioning platforms A and B protrude outward from the upper outer side wall of the small gear, and positioning platform A is located to the left of positioning platform B;

[0016] An arc surface is recessed downward at the top of positioning platform B, and the arc surface of positioning platform B cooperates with the outer side wall of the positioning post;

[0017] Anti-slip hooks are arranged on the inner side walls of the upper clamping portion and the lower clamping portion, and the rubber pads are arranged inside the anti-slip hooks;

[0018] One end of the upper mounting part is hinged to the lower mounting part through a pin shaft, and the other end is hinged to the crank mounting part through a pin shaft.

[0019] The steps of a working method of a gear type traceless pipe wrench are as follows:

[0020] a. Initial installation of the traceless pipe wrench:

[0021] Place the pipe to be tightened between the clamping parts of the upper jaw assembly and the lower jaw assembly. Rotate the return ratchet clockwise relative to the crank assembly, so that the ratchet teeth of the return ratchet are higher than the limiting platform of the upper jaw assembly, and when the return ratchet rotates counterclockwise along with the crank assembly, the ratchet teeth of the return ratchet cannot abut against the limiting platform of the upper jaw assembly, and the limiting platform does not limit the return ratchet; Rotate the crank assembly counterclockwise until the arc surface of the positioning platform B of the pinion gear fits against the outer side wall of the positioning column of the upper jaw assembly. At this time, the positioning column and the positioning platform B cooperate to complete the positioning of the crank assembly relative to the upper jaw assembly;

[0022] Rotate the lower jaw assembly counterclockwise until the first tooth from the top of the large gear contacts the positioning platform A of the pinion gear of the crank assembly. At this time, the large gear and the positioning platform A cooperate to complete the positioning of the lower jaw assembly relative to the crank assembly;

[0023] b. The traceless pipe wrench holds and twists the pipe to be tightened:

[0024] Rotate the crank assembly clockwise so that the pinion gear meshes with the large gear. Continue to rotate the crank assembly clockwise. Due to the meshing of the large and small gears, the upper jaw assembly and the lower jaw assembly cooperate to hold the pipe to be tightened and drive the pipe to rotate, realizing the twisting of the pipe to be tightened by the traceless pipe wrench;

[0025] c. Return of the traceless pipe wrench:

[0026] Rotate the return ratchet counterclockwise relative to the crank assembly, and the ratchet teeth of the return ratchet are lower than the limiting platform of the upper jaw assembly; Rotate the crank assembly counterclockwise, and the crank assembly drives the return ratchet to rotate counterclockwise, so that the ratchet teeth of the return ratchet abut against the limiting platform of the upper jaw assembly, and the return ratchet is blocked, and then the crank assembly is blocked, and the crank assembly cannot continue to rotate counterclockwise, realizing the control of the torsion angle of the pliers handle when the traceless pipe wrench is reversed and returned; At this time, the pinion gear of the crank assembly and the large gear of the lower jaw assembly are still in a meshing state, but because of the counterclockwise rotation of the crank assembly, the upper and lower jaw assemblies of the traceless pipe wrench do not hold the pipe tightly, realizing that the traceless pipe wrench loosens the pipe and does not disengage from the pipe;

[0027] d. The traceless pipe wrench continuously holds, twists the pipe:

[0028] Repeat the operations in step b and step c so that the traceless pipe wrench can continuously perform the operations of holding, twisting, and loosening the pipe until the pipe is tightened;

[0029] e. The traceless pipe wrench disengages from the pipeline:

[0030] When the traceless pipe wrench finishes tightening the pipeline to be tightened, rotate the return ratchet clockwise relative to the rocker assembly, so that the ratchet teeth of the return ratchet are higher than the limiting platform of the upper jaw assembly. Rotate the rocker assembly counterclockwise. When the return ratchet rotates counterclockwise with the rocker assembly, the ratchet teeth of the return ratchet cannot abut against the limiting platform of the upper jaw assembly, and the limiting platform does not limit the return ratchet. Continue to rotate the rocker assembly counterclockwise to release the engagement between the large and small gears, thereby disengaging the traceless pipe wrench from the pipeline.

[0031] The traceless pipe wrench of the present invention has a large clamping force and a small probability of slipping during construction due to the gear combination setting; the rubber pad is provided so that the traceless pipe wrench does not damage the surface of the pipe material at all, effectively protecting the surface of the pipe material; the setting of the return ratchet enables the traceless pipe wrench to both loosen the pipeline at its jaws when returning and not disengage from the pipeline. The traceless pipe wrench does not need to be reinstalled on the pipeline multiple times, can achieve rapid force application when tightening the pipeline, and the time consumed for tightening the pipeline is short, saving time and effort. Brief Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of the present invention.

[0033] Figure 2 It is a schematic structural diagram of the upper jaw assembly.

[0034] Figure 3 It is a schematic diagram of the components of the upper jaw assembly.

[0035] Figure 4 It is a schematic structural diagram of the lower jaw assembly.

[0036] Figure 5 It is a schematic diagram of the components of the lower jaw assembly.

[0037] Figure 6 It is a schematic structural diagram of the rocker assembly.

[0038] Figure 7 It is a schematic diagram of the components of the rocker assembly.

[0039] Figure 8 It is a schematic diagram of the initial installation state of the pipe wrench of the present invention on the pipeline to be tightened.

[0040] Figure 9 For Figure 8 A partially enlarged view of the positioning of the large gear by the positioning platform A and the positioning of the positioning post to the positioning platform B in

[0041] Figure 10 It is a schematic diagram of the engaged state of the pipe wrench of the present invention on the pipeline to be tightened.

[0042] Figure 11 is Figure 10 A partially enlarged view of the correct engagement between the large gear and the small gear.

[0043] Figure 12 is a schematic diagram of the state of the pipe wrench of the present invention when it returns to its original position on the pipeline.

[0044] Figure 13 is Figure 12 A partially enlarged view of the limiting table in limiting the return ratchet.

[0045] In the figure: 1. upper jaw assembly; 2. lower jaw assembly; 3. rocker assembly; 4. small gear; 5. large gear; 6. return ratchet; 7. rubber pad; 8. upper clamping part; 9. upper mounting part; 10. anti-slip barb; 11. positioning post; 12. limiting table; 13. upper jaw plate; 14. thickening plate A; 15. lower clamping part; 16. lower mounting part; 17. lower jaw plate; 18. thickening plate B; 19. thickening plate C; 20. rocker plate; 21. rocker rubber filling plate; 22. rocker mounting part; 23. holding part; 24. pin shaft; 25. positioning table B; 26. positioning table A; 27. pipeline to be tightened. Specific embodiments

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0047] As Figure 1 shown, a gear - type traceless pipe wrench includes a jaw and a handle. The jaw includes an upper jaw assembly 1 and a lower jaw assembly 2, and the handle includes a rocker assembly 3. One end of the upper jaw assembly 1 is hinged to the rocker assembly 3, and the other end is hinged to the lower jaw assembly 2. A large gear 5 is fixedly arranged at the other end of the lower jaw assembly 2. A small gear 4 that cooperates with the large gear is arranged at the hinge joint between the upper jaw assembly 1 and the rocker assembly 3, and the small gear 4 is fixedly arranged on the rocker assembly 3. A return ratchet 6 is arranged to the right of the small gear 4, and the return ratchet 6 is arranged on the rocker assembly 3.

[0048] As Figure 2 shown, the upper jaw assembly 1 includes an upper clamping part 8 and an upper mounting part 9, and the upper clamping part 8 is located inside the upper mounting part 9. A positioning post 11 is fixedly inserted into the right part of the upper mounting part 9, and a limiting table 12 protrudes outward from the outer side wall of the right part of the upper mounting part 9.

[0049] As Figure 3 shown, the upper jaw assembly 1 is formed by stacking an upper jaw plate 13 and thickening plates A 14. There are two upper jaw plates 13 and multiple thickening plates A 14. The multiple thickening plates A are arranged between the two upper jaw plates. The multiple thickening plates A are used to increase the thickness of the upper jaw assembly 1 and thus increase the contact area between the upper jaw assembly 1 and the pipeline 27 to be tightened. Both ends of the positioning post 11 are fixedly arranged on the two upper jaw plates.

[0050] As shown Figure 4 shown, the lower jaw assembly 2 includes a lower clamping portion 15 and a lower mounting portion 16, and the lower clamping portion 15 is located inside the lower mounting portion 16; as Figure 5 shown, the lower jaw assembly 2 is formed by stacking a lower jaw plate 17, a thickening plate B18, and a thickening plate C19; the lower jaw plate 17 is a single piece, and the thickening plates B18 and C19 are symmetrically distributed on both sides of the lower jaw plate 17 from inside to outside in sequence, and both the thickening plates B18 and C19 are even-numbered pieces; the thickening plates B18 and C19 are used to increase the thickness of the lower jaw assembly 2 and thus increase the contact area between the lower jaw assembly 2 and the pipe 27 to be tightened. The large gear 5 is fixedly arranged at the right end of the lower jaw plate 17.

[0051] As shown Figure 6 shown, the crank handle assembly 3 includes a crank handle mounting portion 22 and a gripping portion 23, and the crank handle mounting portion 22 is located on the left side of the gripping portion 23; as Figure 7 shown, the crank handle assembly 3 is formed by stacking a crank handle plate 20 and a crank handle rubber filling plate 21; the crank handle plate 20 is two pieces, the crank handle rubber filling plate 21 is a single piece, the two crank handle plates are symmetrically arranged on both sides of the crank handle rubber filling plate 21, and the return ratchet 6 is arranged on one of the crank handle plates; the setting of the crank handle rubber filling plate 21 can increase the thickness of the crank handle assembly 3 and facilitate the operator to grip the gripping portion of the crank handle assembly. The small gear 4 is fixedly arranged at the left end of the crank handle rubber filling plate 21; on the outer side wall of the upper part of the small gear 4, a positioning platform A26 and a positioning platform B25 are respectively protruded outwards, and the positioning platform A26 is located to the left of the positioning platform B25; the top end of the positioning platform B25 is recessed downwards to form an arc surface, and the arc surface of the positioning platform B25 is matched with the outer side wall of the positioning column 11.

[0052] Both the upper jaw assembly 1 and the lower jaw assembly 2 include a clamping portion, and rubber pads 7 are arranged on the inner side walls of the clamping portions. Anti-slip hooks 10 are arranged on the inner side walls of the upper clamping portion 8 and the lower clamping portion 15, and the rubber pads 7 are arranged inside the anti-slip hooks 10. The anti-slip hooks 10 are used to prevent the rubber pads 7 from slipping.

[0053] One end of the upper mounting portion 9 is hinged to the lower mounting portion 16 through a pin shaft, and the other end is hinged to the crank handle mounting portion 22 through a pin shaft 24.

[0054] The working method of the gear-type non-marking pipe wrench of the present invention is as follows: as Figure 8 shown, when the non-marking pipe wrench of the present invention is initially installed on the pipe to be tightened, the pipe to be tightened is located between the clamping portions of the upper jaw assembly 1 and the lower jaw assembly 2; rotate the return ratchet 6 to rotate clockwise relative to the crank handle assembly 3, so that the ratchet teeth of the return ratchet 6 protrude above the limit platform 12 of the upper jaw assembly 1, so that the ratchet teeth of the return ratchet 6 cannot abut against the limit platform 12 of the upper jaw assembly 1 when the return ratchet 6 rotates counterclockwise along with the crank handle assembly 3, and the limit platform 12 does not limit the return ratchet 6; asFigure 9 As shown, rotate the crank handle assembly 3 counterclockwise until the arc surface of the positioning table B25 of the pinion gear 4 of the crank handle assembly 3 fits against the outer wall of the positioning post 11 of the upper jaw assembly 1. The fitting point is the correct meshing and upper crank handle positioning point of the large and small gears. At this time, the positioning post 11 and the positioning table B25 cooperate to complete the positioning of the crank handle assembly 3 relative to the upper jaw assembly 1. Rotate the lower jaw assembly 2 counterclockwise until the first tooth from the top of the large gear 5 of the lower jaw assembly 2 contacts the positioning table A26 of the pinion gear 4 of the crank handle assembly 3. The contact point is the correct meshing and lower gear positioning point of the large and small gears. At this time, the large gear 5 and the positioning table A26 cooperate to complete the positioning of the lower jaw assembly 2 relative to the crank handle assembly 3.

[0055] By having the pinion gear 4 with the positioning table A and the positioning table B contact the upper and lower jaw assemblies to generate two positioning points, when the traceless pipe wrench is initially installed on the pipe to be tightened, the relative positions among the upper jaw assembly 1, the lower jaw assembly 2, and the crank handle assembly 3 are determined. Furthermore, it ensures that the large and small gears of the traceless pipe wrench are not misaligned in the initial installation state, guaranteeing that the large and small gears are in the correct meshing state when the large and small gears are meshed in the next step. That is, the second tooth from the top of the large gear 5 is the working load-bearing tooth, as Figure 10 、 11 shown. At this time, the correct meshing state of the large and small gears enables the upper jaw assembly 1 and the lower jaw assembly 2 to bite the pipe to be tightened and generate a clamping force on the pipe. The jaws formed by the upper and lower jaw assemblies and the connected crank handle assembly 3 together constitute a force-saving lever, and the pin shaft 24 connecting the upper jaw assembly and the crank handle assembly is the fulcrum of this force-saving lever. The force-saving lever plays the role of saving the operator's effort and at the same time increasing the meshing torque of the large and small gears on the pipe. As the meshing torque increases, the clamping force of the traceless pipe wrench on the pipe increases accordingly. The rubber pad 7 provided on the clamping parts of the upper and lower jaw assemblies generates friction while clamping the pipe, preventing the traceless pipe wrench from slipping during the process of tightening the pipe, and the rubber pad also protects the surface of the pipe. The surface of the tightened pipe is absolutely undamaged. After the rubber pad 7 is damaged, it can be replaced, making the service life of the traceless pipe wrench longer. The replacement cost of the rubber pad is low, reducing the usage cost of the traceless pipe wrench.

[0056] As Figure 12 、 13As shown, the seamless pipe wrench of the present invention is provided with a return ratchet 6. When the seamless pipe wrench needs to loosen the pipe, rotate the return ratchet 6 to rotate counterclockwise relative to the rocker assembly 3. The ratchet teeth of the return ratchet 6 are lower than the limiting platform 12 of the upper jaw assembly 1. Rotate the rocker assembly 3 counterclockwise. The counterclockwise rotation of the rocker assembly 3 releases the state of the pipe being clamped. The rocker assembly 3 drives the return ratchet 6 to rotate counterclockwise, so that the ratchet teeth of the return ratchet 6 abut against the limiting platform 12 of the upper jaw assembly 1. The return ratchet 6 is blocked and then the rocker assembly 3 is blocked. The rocker assembly 3 cannot continue to rotate counterclockwise, realizing the control of the torsion angle of the pliers handle when the seamless pipe wrench is reversed and returned. It is convenient for the operator to quickly exert force when tightening the pipe. At this time, the pinion 4 of the rocker assembly 3 and the large gear 5 of the lower jaw assembly 2 are still in a meshing state, but the upper and lower jaw assemblies of the seamless pipe wrench do not clamp the pipe, realizing the adjustment of the position of the seamless pipe wrench on the pipe and the seamless pipe wrench does not disengage from the pipe, avoiding the complexity and inconvenience of the operation caused by multiple installations of the pipe wrench. The seamless pipe wrench only needs to be installed on the pipe once to complete the tightening of the pipe, making the tightening process of the pipe become a continuous process. The seamless pipe wrench can exert force quickly and complete the tightening of the pipe faster. The position of the return ratchet 6 can be adjusted according to the diameter of the pipe to be tightened to achieve better working effects.

[0057] When the seamless pipe wrench needs to disengage from the pipe, adjust the position of the return ratchet 6 clockwise so that the ratchet teeth of the return ratchet 6 are higher than the limiting platform 12 of the upper jaw assembly 1. The limiting platform 12 cannot abut against the ratchet teeth of the return ratchet 6, and the limiting platform 12 does not limit the return ratchet 6. Rotate the rocker assembly 3 counterclockwise to release the meshing between the large and small gears, so as to disengage the seamless pipe wrench from the pipe.

[0058] The non-marking pipe clamp of the present invention is provided with a return ratchet 6. When the non-marking pipe clamp returns to its original position, the jaws of the non-marking pipe clamp are loosened from the pipe, and the non-marking pipe clamp does not separate from the pipe. The non-marking pipe clamp does not need to be reinstalled on the pipe many times, and can achieve rapid force when tightening the pipe. The time consumed for tightening the pipe is short, which saves time and effort. The thickened sheet A, thickened sheet B, and thickened sheet C provided with the non-marking pipe clamp of the present invention increase the thickness of the upper and lower jaw components, thereby increasing the contact area between the upper and lower jaw components and the pipe. When the pipe is tightened, the force on the entire circumference is balanced, so that the non-marking pipe clamp can achieve good results in construction sites such as thin-walled stainless steel pipes, PE pipes, PPR pipes, and pipes with higher hardness (such as 304 stainless steel) where ordinary pipe clamps cannot produce effective bite marks. The seamless pipe clamp of the present invention has a large clamping force and a small slipping probability during construction through the gear combination arrangement; the arrangement of the rubber pad ensures that the seamless pipe clamp does not damage the surface of the pipe and effectively protects the surface of the pipe; the arrangement of the return ratchet ensures that the seamless pipe clamp not only loosens the pipe with its jaws when returning, but also does not detach from the pipe; the seamless pipe clamp does not need to be reinstalled on the pipe many times, can achieve rapid force when tightening the pipe, and the time consumed in tightening the pipe is short, thus saving time and effort.

[0059] The above implementation modes are not limitations of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the scope of the technical solution of the present invention also belong to the protection scope of the present invention.

Claims

1. A gear - type traceless pipe wrench, Characterized in that: It includes a jaw and a handle. The jaw includes an upper jaw assembly (1) and a lower jaw assembly (2), and the handle includes a crank assembly (3). One end of the upper jaw assembly (1) is hinged to the crank assembly (3), and the other end is hinged to the lower jaw assembly (2). A large gear (5) is fixedly arranged at the other end of the lower jaw assembly (2). A small gear (4) that cooperates with the large gear is arranged at the hinge joint between the upper jaw assembly (1) and the crank assembly (3), and the small gear (4) is fixedly arranged on the crank assembly (3). A return ratchet (6) is arranged to the right of the small gear (4), and the return ratchet (6) is arranged on the crank assembly (3). Both the upper jaw assembly (1) and the lower jaw assembly (2) include clamping parts, and rubber pads (7) are arranged on the inner side walls of the clamping parts. The upper jaw assembly (1) includes an upper clamping part (8) and an upper mounting part (9), and the upper clamping part (8) is located inside the upper mounting part (9). A positioning column (11) is fixedly inserted into the right part of the upper mounting part (9), and a limiting platform (12) protrudes outward from the outer side wall of the right part of the upper mounting part (9). The upper jaw assembly (1) is formed by stacking an upper jaw plate (13) and a thickening plate A (14). There are two upper jaw plates (13) and multiple thickening plates A. The multiple thickening plates A are arranged between the two upper jaw plates. The lower jaw assembly (2) includes a lower clamping part (15) and a lower mounting part (16), and the lower clamping part (15) is located inside the lower mounting part (16). The lower jaw assembly (2) is formed by stacking a lower jaw plate (17), a thickening plate B (18), and a thickening plate C (19). There is one lower jaw plate (17), and the thickening plates B (18) and C (19) are symmetrically distributed on both sides of the lower jaw plate (17) from the inside to the outside in sequence, and both the thickening plates B (18) and C (19) are even - numbered. The large gear (5) is fixedly arranged at the right end of the lower jaw plate (17). The crank assembly (3) includes a crank mounting part (22) and a holding part (23), and the crank mounting part (22) is located on the left side of the holding part (23). The crank assembly (3) is formed by stacking a crank plate (20) and a crank rubber filling plate (21). There are two crank plates (20) and one crank rubber filling plate (21). The two crank plates are symmetrically arranged on both sides of the crank rubber filling plate (21), and the return ratchet (6) is arranged on one of the crank plates. The small gear (4) is fixedly arranged at the left end of the crank rubber filling plate (21). Positioning platforms A (26) and B (25) protrude outward from the upper outer side wall of the small gear (4), and the positioning platform A (26) is located to the left of the positioning platform B (25). The top of the positioning platform B (25) is recessed downward to form an arc surface, and the arc surface of the positioning platform B (25) cooperates with the outer side wall of the positioning column (11). Anti - slip hooks (10) are arranged on the inner side walls of both the upper clamping part (8) and the lower clamping part (15), and the rubber pads (7) are arranged inside the anti - slip hooks (10). One end of the upper mounting portion (9) is hinged to the lower mounting portion (16) through a pin shaft, and the other end is hinged to the crank mounting portion (22) through a pin shaft (24).

2. The working method of the gear - type traceless pipe wrench according to claim 1, characterized in that: the steps of the method are: a. Initial installation of the traceless pipe wrench: Place the pipe (27) to be tightened between the clamping parts of the upper jaw assembly (1) and the lower jaw assembly (2). Rotate the return ratchet (6) clockwise relative to the crank assembly (3), so that the ratchet teeth of the return ratchet (6) are higher than the limit platform (12) of the upper jaw assembly (1), so that when the return ratchet (6) rotates counterclockwise along with the crank assembly (3), the ratchet teeth of the return ratchet (6) cannot abut against the limit platform (12) of the upper jaw assembly (1), and the limit platform (12) does not limit the return ratchet (6); Rotate the crank assembly (3) counterclockwise until the arc surface of the positioning platform B (25) of the pinion (4) fits against the outer wall of the positioning column (11) of the upper jaw assembly (1). At this time, the positioning column (11) and the positioning platform B (25) cooperate to complete the positioning of the crank assembly (3) relative to the upper jaw assembly (1); Rotate the lower jaw assembly (2) counterclockwise until the first tooth from the top of the large gear (5) contacts the positioning platform A (26) of the pinion (4) of the crank assembly (3). At this time, the large gear (5) and the positioning platform A (26) cooperate to complete the positioning of the lower jaw assembly (2) relative to the crank assembly (3); b. The traceless pipe wrench holds and twists the pipe to be tightened: Rotate the crank assembly (3) clockwise so that the pinion (4) meshes with the large gear (5). Continue to rotate the crank assembly (3) clockwise. Due to the meshing of the large and small gears, the upper jaw assembly (1) and the lower jaw assembly (2) cooperate to hold the pipe (27) to be tightened and drive the pipe to rotate, realizing the twisting of the pipe (27) to be tightened by the traceless pipe wrench; c. Return of the traceless pipe wrench: Rotate the return ratchet (6) counterclockwise relative to the crank assembly (3), and the ratchet teeth of the return ratchet (6) are lower than the limit platform (12) of the upper jaw assembly (1); Rotate the crank assembly (3) counterclockwise. The crank assembly (3) drives the return ratchet (6) to rotate counterclockwise, so that the ratchet teeth of the return ratchet (6) abut against the limit platform (12) of the upper jaw assembly (1). The return ratchet (6) is blocked, and then the crank assembly (3) is blocked, and the crank assembly (3) cannot continue to rotate counterclockwise, realizing the control of the torsional angle of the pliers handle when the traceless pipe wrench is reversed and returned; At this time, the pinion (4) of the crank assembly (3) and the large gear (5) of the lower jaw assembly (2) are still in a meshing state, but because of the counterclockwise rotation of the crank assembly (3), the upper and lower jaw assemblies of the traceless pipe wrench do not hold the pipe tightly, realizing that the traceless pipe wrench loosens the pipe without detaching from the pipe; d. The traceless pipe wrench continuously holds, twists the pipe: Repeat the operations of step b and step c so that the traceless pipe wrench can continuously perform the operations of holding, twisting, and loosening the pipe until the pipe is tightened; e. The traceless pipe wrench detaches from the pipe: After the traceless pipe wrench finishes tightening the pipe (27) to be tightened, rotate the return ratchet (6) clockwise relative to the crank assembly (3), so that the ratchet teeth of the return ratchet (6) protrude above the limit platform (12) of the upper jaw assembly (1). Rotate the crank assembly (3) counterclockwise. When the return ratchet (6) rotates counterclockwise along with the crank assembly (3), the ratchet teeth of the return ratchet (6) cannot abut against the limit platform (12) of the upper jaw assembly (1), and the limit platform (12) does not limit the return ratchet (6). Continue to rotate the crank assembly (3) counterclockwise to release the engagement between the large and small gears, so as to disengage the traceless pipe wrench from the pipe.

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