Traceless chain pipe wrench and method

Abstract

The invention discloses a traceless chain pipe wrench which comprises a chain cangue, symmetrical first connecting seats are arranged at one end of the chain cangue and located on one side of the chain cangue, symmetrical second connecting seats are arranged at the other end of the chain cangue, a first through groove is formed in the middle of the chain cangue, and a chain set is hinged to the first connecting seats through first cylindrical pins. The other end of the chain set penetrates through the first through groove, the second connecting base is fixedly connected to one end of the plier head through a second cylindrical pin, the plier head is provided with a through first through hole, a pawl rod is arranged at the end, close to the chain cangue, in the first through hole, a limiting block is fixedly connected to the end, close to the chain cangue, of the pawl rod, and the other end of the pawl rod is connected with a plier handle. The plier handle is in threaded connection in the first through hole of the plier head. The chain pliers solve the problems that the smooth surface of a pipe body is bitten by existing chain pliers, and the complete and smooth surface of a tool is damaged.

Description

Technical Field

[0001] The invention belongs to the technical field of chain pipe clamps, and in particular relates to a traceless chain pipe clamp and a method. Background Art

[0002] Chain pliers are used for disassembly and assembly of downhole testing and completion operations.

[0003] The chain pliers are mainly composed of a pliers handle (with pliers teeth at the front end of the pliers handle) and a chain. The chain is wrapped around the pliers handle, and the serrated pliers at the front end of the pliers handle are rigidly engaged to hold and clamp the pipe. The chain adopts a single-row structure and only serves to connect the pliers teeth. Therefore, under the action of clamping or rotating with a slightly large torque, the pliers teeth are in a high stress area and will leave bite marks on the surface of the pipe. There is damage on the surface of the tool, and there are structural defects of local high stress on the compressive strength and tensile strength.

[0004] Since the existing chain pliers have bite marks on the smooth surface of the pipe body, the intact and smooth surface of the tool is damaged, which is not conducive to the application of parts corrosion and high-strength pressure-resistant environments. Summary of the invention

[0005] The purpose of the invention is to provide a chain pipe clamp with no mark clamping, which solves the problem that the existing chain pipe clamp has bite marks on the smooth surface of the pipe body and damages the complete and smooth surface of the tool.

[0006] The technical solution adopted by the present invention is a traceless chain pipe pliers, comprising a chain flail, a symmetrical first connecting seat being provided at one end of the chain flail, the first connecting seat being located on one side of the chain flail, a symmetrical second connecting seat being provided at the other end of the chain flail, a first through groove being provided in the middle of the chain flail, a chain group being hingedly connected to the first connecting seat through a first cylindrical pin, the other end of the chain group passing through the first through groove, the second connecting seat being fixedly connected to one end of the pliers head through a second cylindrical pin, a first through hole being provided in the pliers head, a ratchet rod being provided in the first through hole near one end of the chain flail, a limiting block being fixedly connected to the end of the ratchet rod near one end of the chain flail, a pliers handle being threadedly connected to the first through hole of the pliers head.

[0007] The present invention is also characterized in that: It includes a chain clamp chain plate, and two holes are respectively arranged at both ends of the chain clamp chain plate, which is in the shape of an "8" as a whole. One side of the chain clamp chain plate is V-shaped, which is the tightening and extrusion surface of the chain plate, and the other side is arc-shaped, which is the contact surface of the clamped body.

[0008] The chain group is composed of multiple chain clamp chain plates and multiple connecting plates. Both ends of the connecting plates are provided with holes, and the whole presents an "8" shape. The two sides at both ends of the connecting plate respectively match one end of the chain clamp chain plate, and correspondingly, the two sides at both ends of the chain clamp chain plate respectively match one end of the connecting plate. Through sequential stacking, the matching parts appear as chain clamp chain plate, connecting plate, chain clamp chain plate...chain clamp chain plate. The connecting plate and the chain clamp chain plate are hinged at the matching part by a pin shaft to form a unit of the chain group. Multiple units are connected in sequence to form a chain group.

[0009] The first connecting seat has a plurality of spacer plates with uniform gaps, and the spacer plates can be hingedly matched with the connecting plate at one end of the chain set.

[0010] A coil spring is arranged in the first through slot, the coil spring is fixedly connected by an elastic cylindrical pin, and the coil spring is close to the second connecting seat.

[0011] The connection between the ratchet rod and the clamp handle is connected through a retaining ring.

[0012] The pawl rod limit block cooperates with the tightening and extruding surface of the chain link in the chain group.

[0013] Another technical solution adopted by the present invention is a seamless chain pipe clamp method, which uses the seamless chain pipe clamp described above and is specifically implemented in the following steps: Step 1: The clamped body contact surface of the chain group contacts the clamped body, and the unfixed end of the chain group passes through the first through slot of the chain yoke, and the coil spring provides a pre-tightening force to block the chain group, and the chain group and the clamping body are pre-locked; Step 2, rotating the clamp handle, the clamp handle drives the ratchet rod to rotate forward in the first through hole of the clamp head until the ratchet rod presses against the chain group to fix the clamped object; Step 3, the clamp handle is pressed down, and the clamp handle drives the clamp head to rotate at the second connecting seat, and the clamp handle and the clamp head simultaneously drive the ratchet rod to further tighten the chain group, fix the clamped object, and complete the clamping action; Step 4, lift the clamp handle and rotate it in the opposite direction. The clamp handle drives the ratchet rod to disengage from the chain group, compressing the coil spring. The unfixed end of the chain group disengages from the first slot of the chain yoke, and the chain group moves away from the clamped body, completing the loosening action.

[0014] The beneficial effects of the present invention are: (1) The existing chain pliers use a single-row chain, and the chain plates are separated by sleeves. The chain plates are used for connection, and the movable hinge points are increased to adapt to different specifications of outer diameters. The traceless chain pipe pliers chain of the present invention uses a sleeveless multi-row chain, which retains the chain connection and pin hinge functions. The chain plates and the pipe body are nearly 360° fully wrapped, and the multi-row chain plates without sleeves increase the actual contact area between the chain and the pipe body. The chain plates and the pipe body are evenly contacted by force to achieve a tight grip on the pipe body. The clamping of the pipe body has no tooth marks, and traceless clamping can be achieved. In addition, due to the use of high-strength metal parts, the safety torque provided is much higher than that of ordinary traceless band pliers. It is a combination of the traceless characteristics of a band pliers and the high torque characteristics of a chain pliers and pipe pliers; the multi-piece chain plates, each of which is independent, better adapt to the dimensional deviation on the surface of the pipe body.

[0015] (2) The traceless chain pipe clamp of the present invention has strong applicability. Because of the sleeve-free structure, it can clamp workpieces of various shapes or materials, whether steel pipes, plastics, or irregularly shaped workpieces, such as hexagonal, four-sided, etc., so that it can play a role in various complex working conditions; (3) The markless chain pipe clamp of the present invention adopts multiple rows of chain plates, so the chain clamping force is uniform, and it is also highly applicable to thin-walled pipes. There is no local high stress on the thin-walled pipe body, and a higher chain clamping force can be applied; (4) The markless chain pipe clamp of the present invention adjusts the clamping force of the chain by rotating the clamp handle, so that the clamping force of the present invention is adjustable.

[0016] (5) The traceless chain pipe clamp of the present invention has obvious advantages because it is not limited in size and can be easily operated in a narrow space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the seamless chain pipe clamp of the present invention; Figure 2 It is a three-dimensional schematic diagram of the traceless chain pipe clamp of the present invention; Figure 3 It is a schematic diagram of the chain yoke structure in the traceless chain pipe clamp of the present invention; Figure 4 It is a schematic diagram of the structure of the ratchet rod in the traceless chain pipe wrench of the present invention; Figure 5 It is a schematic diagram of the structure of the chain piece of the chain pliers in the traceless chain pipe pliers of the present invention; Figure 6 The utility model is a schematic diagram of the structure of the chain piece of the chain clamp in the existing pipe clamp.

[0018] In the figure, 1. pin shaft, 2. chain set, 3. cylindrical pin, 4. chain yoke, 5. coil spring, 6. elastic cylindrical pin, 7. ratchet rod, 8. cylindrical pin, 9. pliers head, 10. retaining ring, 11. pliers handle. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with specific implementation modes.

[0020] Markless chain pipe wrench, such as Figure 1 , Figure 2 and Figure 3 As shown, it includes a chain flail 4, one end of the chain flail 4 is provided with a symmetrical first connecting seat, the first connecting seat is located on one side of the chain flail 4, the other end of the chain flail 4 is provided with a symmetrical second connecting seat, the middle part of the chain flail 4 is provided with a first through groove, the first connecting seat is hinged with a chain group 2 through a first cylindrical pin 3, the other end of the chain group 2 passes through the first through groove, the second connecting seat is fixed to one end of the clamp head 9 through a second cylindrical pin 8, the clamp head 9 is provided with a first through hole, a ratchet rod 7 is provided in the first through hole at one end near the chain flail 4, the ratchet rod 7 is fixedly connected to a limiting block near one end of the chain flail 4, the other end of the ratchet rod 7 is connected to a clamp handle 11, and the clamp handle 11 is threadedly connected in the first through hole of the clamp head 9.

[0021] like Figure 5 As shown, two holes are provided at both ends of the chain clamp chain plate, and the whole presents an "8" shape. One side of the chain clamp chain plate is V-shaped, which is the tightening and extrusion surface of the chain plate, and the other side is arc-shaped, which is the contact surface of the clamped body. Figure 6 Shown is the existing chain clamp chain.

[0022] The chain group 2 is composed of multiple chain clamp chain plates and multiple connecting plates. Both ends of the connecting plates are respectively provided with holes, and the whole presents an "8" shape. The two sides at both ends of the connecting plate respectively match one end of the chain clamp chain plate, and correspondingly, the two sides at both ends of the chain clamp chain plate respectively match one end of the connecting plate. Through sequential stacking, the matching parts appear as chain clamp chain plate, connecting plate, chain clamp chain plate...chain clamp chain plate. The matching parts of the connecting plate and the chain clamp chain plate are hinged by a pin shaft 1 to form a unit of the chain group 2. Multiple units are connected in sequence to form a chain group 2.

[0023] like Figure 3 As shown, the first connecting seat has a plurality of spacers with uniform gaps, and the spacers can be hingedly connected with the connecting piece at one end of the chain set 2.

[0024] A coil spring 5 is arranged in the first through groove, and the coil spring 5 is fixedly connected by an elastic cylindrical pin 6. The coil spring 5 is close to the second connecting seat, and is used to block the chain set 2 to prevent the chain set 2 from falling out of the clamp head 9 before being tightened.

[0025] The connection between the ratchet rod 7 and the clamp handle 11 is connected by a retaining ring 10 to prevent the ratchet rod 7 from falling out, wherein the retaining ring 10 is easy to replace.

[0026] like Figure 4 As shown, the limit block of the ratchet rod 7 cooperates with the tightening and extruding surface of the chain link in the chain set 2.

[0027] The method for loading and unloading a pipe body by using the above-mentioned seamless chain pipe clamp comprises the following steps: Step 1, the clamped body contact surface of the chain set 2 contacts the clamped body, the unfixed end of the chain set 2 passes through the first through slot of the chain yoke 4, the coil spring 5 provides a pre-tightening force to block the chain set 2, and the chain set 2 and the clamping body are pre-locked; Step 2, rotating the clamp handle 11, the clamp handle 11 drives the ratchet rod 7 to rotate forward in the first through hole of the clamp head 9, until the ratchet rod 7 presses against the chain set 2 to fix the clamped object; Step 3, press down the clamp handle 11, the clamp handle 11 drives the clamp head 9 to rotate at the second connecting seat, and the clamp handle 11 and the clamp head 9 simultaneously drive the ratchet rod 7 to further tighten the chain set 2, fix the clamped object, and complete the clamping action; Step 4, lift the clamp handle 11, rotate the clamp handle 11 in the opposite direction, the clamp handle 11 drives the pawl rod 7 to disengage from the chain set 2, squeeze the coil spring 5, the unfixed end of the chain set 2 disengages from the first through slot of the chain yoke 4, and the chain set 2 moves away from the clamped body, completing the loosening action.

[0028] Embodiment 1: Markless chain pipe wrench, such as Figure 1 , Figure 2 and Figure 3 As shown, a symmetrical first connecting seat is provided at one end of the chain flail 4, and the first connecting seat is located on one side of the chain flail 4. A symmetrical second connecting seat is provided at the other end of the chain flail 4. A first through groove is opened in the middle of the chain flail 4. The first connecting seat is hinged with the chain group 2 through the first cylindrical pin 3. The other end of the chain group 2 passes through the first through groove. The second connecting seat is fixed to one end of the clamp head 9 through the second cylindrical pin 8. The clamp head 9 has a first through hole. A ratchet rod 7 is provided in the first through hole at one end near the chain flail 4. The ratchet rod 7 is fixed to a limiting block near one end of the chain flail 4. The other end of the ratchet rod 7 is connected to a clamp handle 11, and the clamp handle 11 is threadedly connected in the first through hole of the clamp head 9.

[0029] Embodiment 2: Markless chain pipe wrench, such as Figure 1 , Figure 2 and Figure 3 As shown, a symmetrical first connecting seat is provided at one end of the chain flail 4, and the first connecting seat is located on one side of the chain flail 4. A symmetrical second connecting seat is provided at the other end of the chain flail 4. A first through slot is provided in the middle of the chain flail 4. The first connecting seat is hinged with the chain group 2 through the first cylindrical pin 3. The other end of the chain group 2 passes through the first through slot. The second connecting seat is fixed to one end of the clamp head 9 through the second cylindrical pin 8. The clamp head 9 is provided with a first through hole. A ratchet rod 7 is provided at one end of the first through hole near the chain flail 4. The ratchet rod 7 is fixed to a limiting block near one end of the chain flail 4. The other end of the ratchet rod 7 is connected to a clamp handle 11, and the clamp handle 11 is threadedly connected to the first through hole of the clamp head 9. As shown Figure 5As shown, two holes are provided at both ends of the chain clamp chain plate, and the whole is in the shape of an "8". One side of the chain clamp chain plate is V-shaped, which is the tightening and extrusion surface of the chain plate, and the other side is arc-shaped, which is the contact surface of the clamped body.

[0030] Embodiment 3: Markless chain pipe wrench, such as Figure 1 , Figure 2 and Figure 3 As shown, a symmetrical first connecting seat is provided at one end of the chain flail 4, and the first connecting seat is located on one side of the chain flail 4. A symmetrical second connecting seat is provided at the other end of the chain flail 4. A first through slot is provided in the middle of the chain flail 4. The first connecting seat is hinged with the chain group 2 through the first cylindrical pin 3. The other end of the chain group 2 passes through the first through slot. The second connecting seat is fixed to one end of the clamp head 9 through the second cylindrical pin 8. The clamp head 9 is provided with a first through hole. A ratchet rod 7 is provided at one end of the first through hole near the chain flail 4. The ratchet rod 7 is fixed to a limiting block near one end of the chain flail 4. The other end of the ratchet rod 7 is connected to a clamp handle 11, and the clamp handle 11 is threadedly connected to the first through hole of the clamp head 9. As shown Figure 5 As shown, two holes are provided at both ends of the chain clamp chain piece, and the whole presents an "8" shape. One side of the chain clamp chain piece is V-shaped, which is the tightening and extrusion surface of the chain piece, and the other side is arc-shaped, which is the contact surface of the clamped body. The chain group 2 is composed of multiple chain clamp chain pieces and multiple connecting pieces. Holes are provided at both ends of the connecting piece, and the whole presents an "8" shape. The two sides at both ends of the connecting piece are respectively matched with one end of the chain clamp chain piece. Correspondingly, the two sides at both ends of the chain clamp chain piece are respectively matched with one end of the connecting piece. Through sequential superposition, the matching part presents a chain clamp chain piece, a connecting piece, a chain clamp chain piece... a chain clamp chain piece. The matching part of the connecting piece and the chain clamp chain piece is hinged by a pin shaft 1 to form a unit of the chain group 2. Multiple units are sequentially connected to form the chain group 2.

[0031] Embodiment 4: Markless chain pipe wrench, such as Figure 1 , Figure 2 and Figure 3 As shown, a symmetrical first connecting seat is provided at one end of the chain flail 4, and the first connecting seat is located on one side of the chain flail 4. A symmetrical second connecting seat is provided at the other end of the chain flail 4. A first through slot is provided in the middle of the chain flail 4. The first connecting seat is hinged with the chain group 2 through the first cylindrical pin 3. The other end of the chain group 2 passes through the first through slot. The second connecting seat is fixed to one end of the clamp head 9 through the second cylindrical pin 8. The clamp head 9 is provided with a first through hole. A ratchet rod 7 is provided at one end of the first through hole near the chain flail 4. The ratchet rod 7 is fixed to a limiting block near one end of the chain flail 4. The other end of the ratchet rod 7 is connected to a clamp handle 11, and the clamp handle 11 is threadedly connected to the first through hole of the clamp head 9. As shown Figure 3 As shown, the first connecting seat has a plurality of spacers with uniform gaps, and the spacers can be hingedly connected with the connecting piece at one end of the chain set 2.

[0032] Embodiment 5: Markless chain pipe wrench, such as Figure 1 , Figure 2 and Figure 3 As shown, a symmetrical first connection seat is provided at one end of the chain flail 4, and the first connection seat is located on one side of the chain flail 4. A symmetrical second connection seat is provided at the other end of the chain flail 4. A first through slot is provided in the middle of the chain flail 4. The first connection seat is hinged with the chain set 2 through the first cylindrical pin 3. The other end of the chain set 2 passes through the first through slot. The second connection seat is fixed to one end of the clamp head 9 through the second cylindrical pin 8. The clamp head 9 has a through first through hole. A ratchet rod 7 is provided at one end of the first through hole near the chain flail 4. The ratchet rod 7 is fixed to a limit block near one end of the chain flail 4. The other end of the ratchet rod 7 is connected to a clamp handle 11, and the clamp handle 11 is threadedly connected to the first through hole of the clamp head 9. A coil spring 5 is provided in the first through slot. The coil spring 5 is fixedly connected by an elastic cylindrical pin 6. The coil spring 5 is close to the second connection seat. The coil spring is used to block the chain set 2 to prevent the chain set 2 from falling out of the clamp head 9 before it is tightened.

[0033] Embodiment 6: Markless chain pipe wrench, such as Figure 1 , Figure 2 and Figure 3 As shown, a symmetrical first connection seat is provided at one end of the chain flail 4, and the first connection seat is located on one side of the chain flail 4. A symmetrical second connection seat is provided at the other end of the chain flail 4. A first through slot is provided in the middle of the chain flail 4. The first connection seat is hinged with the chain set 2 through the first cylindrical pin 3. The other end of the chain set 2 passes through the first through slot. The second connection seat is fixed to one end of the clamp head 9 through the second cylindrical pin 8. The clamp head 9 is provided with a through first through hole. A ratchet rod 7 is provided at one end of the first through hole near the chain flail 4. The ratchet rod 7 is fixed to a limit block near one end of the chain flail 4. The other end of the ratchet rod 7 is connected to a clamp handle 11, and the clamp handle 11 is threadedly connected in the first through hole of the clamp head 9. The ratchet rod 7 and the clamp handle 11 are connected by a retaining ring 10 to prevent the ratchet rod 7 from falling out, wherein the retaining ring 10 is easy to replace.

[0034] Embodiment 7: Markless chain pipe wrench, such as Figure 1 , Figure 2 and Figure 3As shown, a symmetrical first connecting seat is provided at one end of the chain flail 4, and the first connecting seat is located on one side of the chain flail 4. A symmetrical second connecting seat is provided at the other end of the chain flail 4. A first through groove is opened in the middle of the chain flail 4. The first connecting seat is hinged with the chain group 2 through the first cylindrical pin 3. The other end of the chain group 2 passes through the first through groove. The second connecting seat is fixed to one end of the clamp head 9 through the second cylindrical pin 8. The clamp head 9 has a first through hole. A ratchet rod 7 is provided in the first through hole at one end near the chain flail 4. The ratchet rod 7 is fixed to a limiting block near one end of the chain flail 4. The other end of the ratchet rod 7 is connected to a clamp handle 11, and the clamp handle 11 is threadedly connected in the first through hole of the clamp head 9. The chain set 2 is composed of a plurality of chain clamp links and a plurality of connecting links. Holes are provided at both ends of the connecting links, and the whole is in the shape of an "8". The two sides at both ends of the connecting links are matched with one end of the chain clamp links, and correspondingly, the two sides at both ends of the chain clamp links are matched with one end of the connecting links. By stacking them in sequence, the matching parts are presented as chain clamp links, connecting links, chain clamp links...chain clamp links. The matching parts of the connecting links and chain clamp links are hinged by the pin 1 to form a unit of the chain set 2. Multiple units are connected in sequence to form the chain set 2. Figure 3 As shown, the first connection seat has a plurality of spacers with uniform gaps, which can be hinged with the connection piece at one end of the chain set 2. A coil spring 5 is arranged in the first through groove, and the coil spring 5 is fixedly connected by an elastic cylindrical pin 6. The coil spring 5 is close to the second connection seat, and the coil spring is used to block the chain set 2 to prevent the chain set 2 from falling out of the clamp head 9 before it is tightened. Figure 4 As shown, the limit block of the ratchet rod 7 cooperates with the tightening and extruding surface of the chain link in the chain set 2.

[0035] Application of the present invention: In petroleum tools, it can be used to tighten and disassemble the threads and other connectors of various tools, such as the outer cylinder, spindle, joint and other parts; Installation and maintenance of thin-walled pipes, not only for metal materials, its uniform clamping force can also be applied to thin-walled metal pipes or plastic pipes without damaging the surface quality; Based on the characteristics of the chain pipe clamp, it is not limited to the application in the petroleum industry, but can also be used in chemical plants, machinery plants, electrical plants, aerospace, and shipbuilding plants.

[0036] The traceless chain pipe clamp of the present invention has the following specific processes: First, lock the chain group and the clamping body, cooperate with the contact surface of the chain group and the clamped body, and the unfixed end of the chain group passes through the first through slot of the chain yoke and is blocked by the coil spring; secondly, rotate the clamp handle, and the clamp handle drives the ratchet rod to push the chain group forward, cooperate with the chain group to tighten the extrusion surface, and fix the clamped body; finally, the clamp handle is further clamped and applied with a rotational force or fixed through the lever principle to complete the clamping action and achieve seamless clamping.

Claims

1. Markless chain pipe clamp, characterized by: The invention comprises a chain flail (4), wherein one end of the chain flail (4) is provided with a symmetrical first connecting seat, the first connecting seat is located on one side of the chain flail (4), the other end of the chain flail (4) is provided with a symmetrical second connecting seat, the middle of the chain flail (4) is provided with a first through slot, the first connecting seat is hingedly connected to a chain group (2) through a first cylindrical pin (3), the other end of the chain group (2) passes through the first through slot, the second connecting seat is fixedly connected to one end of a clamp head (9) through a second cylindrical pin (8), the clamp head (9) is provided with a through first through hole, a ratchet rod (7) is provided in the first through hole at one end close to the chain flail (4), a limit block is fixedly connected to the ratchet rod (7) at one end close to the chain flail (4), the other end of the ratchet rod (7) is connected to a clamp handle (11), and the clamp handle (11) is threadedly connected in the first through hole of the clamp head (9).

2. The seamless chain pipe wrench according to claim 1, characterized in that: It includes a chain clamp chain plate, two holes are respectively arranged at both ends of the chain clamp chain plate, and the whole is in an "8" shape. One side of the chain clamp chain plate is V-shaped, which is the tightening and extrusion surface of the chain plate, and the other side is arc-shaped, which is the contact surface of the clamped body.

3. The seamless chain pipe wrench according to claim 1, characterized in that: The chain group (2) is composed of a plurality of chain clamp chain pieces and a plurality of connecting pieces. The two ends of the connecting pieces are respectively provided with holes, and the whole is in the shape of an "8". The two sides at the two ends of the connecting piece respectively match one end of the chain clamp chain piece. Correspondingly, the two sides at the two ends of the chain clamp chain piece respectively match one end of the connecting piece. By sequentially stacking, the matching parts are presented as chain clamp chain piece, connecting piece, chain clamp chain piece...chain clamp chain piece. The matching parts of the connecting piece and the chain clamp chain piece are hinged by a pin shaft (1) to form a unit of the chain group (2). The multiple units are sequentially connected to form the chain group (2).

4. The seamless chain pipe wrench according to claim 1, characterized in that: The first connecting seat has a plurality of spacers with uniform gaps, and the spacers can be hingedly connected with the connecting piece at one end of the chain set (2).

5. The seamless chain pipe wrench according to claim 1, characterized in that: A coil spring (5) is disposed in the first through slot, the coil spring (5) being fixedly connected via an elastic cylindrical pin (6), and the coil spring (5) being close to the second connecting seat.

6. The seamless chain pipe wrench according to claim 1, characterized in that: The connection between the ratchet rod (7) and the clamp handle (11) is connected via a retaining ring (10).

7. The seamless chain pipe wrench according to claim 1, characterized in that: The limit block of the ratchet rod (7) cooperates with the tightening and extruding surface of the chain link in the chain group (2).

8. A method for loading and unloading a pipe body using the seamless chain pipe clamp according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1, the clamped body contact surface of the chain group (2) contacts the clamped body, the unfixed end of the chain group (2) passes through the first through slot of the chain yoke (4), the coil spring (5) provides a pre-tightening force to block the chain group (2), and the chain group (2) and the clamping body are pre-locked; Step 2, rotating the clamp handle (11), the clamp handle (11) drives the ratchet rod (7) to rotate forward in the first through hole of the clamp head (9), until the ratchet rod (7) presses against the chain assembly (2) to fix the clamped object; Step 3, the clamp handle (11) is pressed down, the clamp handle (11) drives the clamp head (9) to rotate at the second connecting seat, and the clamp handle (11) and the clamp head (9) simultaneously drive the ratchet rod (7) to further tighten the chain assembly (2), fix the clamped object, and complete the clamping action; Step 4, raising the clamp handle (11), and rotating the clamp handle (11) in the opposite direction, the clamp handle (11) drives the ratchet rod (7) to disengage from the chain set (2), compressing the coil spring (5), and the unfixed end of the chain set (2) disengages from the first through slot of the chain yoke (4), and the chain set (2) moves away from the clamped body, thereby completing the release action.

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