Pipe end clamping structure

Abstract

The utility model relates to the technical field of auxiliary clamping devices of pipe cutting machines, in particular to a pipe end clamping structure. The clamping structure comprises a clamping air cylinder and a clamping jaw mechanism, the clamping air cylinder comprises an integrated cylinder body, a first piston rod, a second piston rod and an end cover, a middle partition plate is arranged in the integrated cylinder body and divides an inner cavity of the integrated cylinder body into a first cavity body and a second cavity body, the first piston rod is movably arranged in the first cavity body, and the second piston rod is movably arranged in the second cavity body. The second piston rod is movably arranged in the second cavity, the first piston rod is provided with a piston rod through hole allowing the second piston rod to penetrate and be inserted, the second piston rod penetrates through the piston rod through hole so as to extend out of the same end of the integrated cylinder body with the first piston rod, and the end cover is installed at a port, allowing the first piston rod and the second piston rod to extend out, of the integrated cylinder body. According to the pipe end clamping structure, the integrated cylinder body is adopted, so that the service life of the air cylinder is prolonged, and the pipe end clamping structure can clamp various pipe bodies for a long time at high frequency.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipe cutting machine auxiliary clamping device technical field especially relates to a pipe end clamping structure. BACKGROUND

[0002] The prior art discloses a four-jaw double-action tail clamp, which comprises a rack, a rotary drive mechanism arranged on the rack, a clamping jaw mounting disc fixedly arranged on the front side of a cylinder, two left and right clamping jaws and two up and down clamping jaws movably arranged on the front side of the clamping jaw mounting disc, a transmission mechanism for realizing transmission between the cylinder and the clamping jaw, the cylinder comprises an integrated cylinder body, a front cover, a rear cover, a front piston rod and a rear piston rod, the rotary drive mechanism comprises a speed reducer, a connecting flange and a main shaft, the speed reducer is fixedly arranged on the rack through the connecting flange, the main shaft is rotatably arranged in the rack, and the front and rear ends of the main shaft are fixedly connected with the rear cover of the cylinder and the power output shaft of the speed reducer; the integrated cylinder body of the cylinder is jointly formed by a first integrated cylinder body to a third integrated cylinder body, the front piston rod is fixedly connected by being divided into first and second front piston rods arranged in the first and second integrated cylinder bodies, and the rear piston rod is fixedly connected by being divided into first and second rear piston rods arranged in the third integrated cylinder body, so as to improve the clamping force of the clamping jaw.

[0003] However, the device has the following technical problems:

[0004] 1. The integrated cylinder body is divided into three sections, and the three-section integrated cylinder body is assembled in a splicing mode, and the assembly concentricity is low. In the scene of repeatedly clamping the pipe body for pipe cutting machine cutting with high frequency, the low concentricity of the split cylinder body often causes the wear of the piston rod and the integrated cylinder body to be more serious, and the normal service life of the cylinder is shortened.

[0005] 2. The end cover of the cylinder is an integrated flange end cover. There is often a matching tolerance between the screw hole on the flange end cover and the bolt, so that the flange end cover can only be axially fixed to the end face of the cylinder body by the bolt, but the flange end cover still has looseness in the diameter direction of the piston rod.

[0006] 3. The cylinder drives the clamping jaw to open or close through the gear transmission structure. Due to the size limitation of the gear teeth itself, the structural strength of the gear teeth is slightly low. When the cylinder drives the clamping jaw to close to clamp the hard pipe body through the gear transmission structure, the gear teeth are easy to be damaged due to excessive force, so that the clamping jaw loses the clamping function. INVENTION CONTENTS

[0007] The utility model provides a pipe end clamping structure, adopts integrated cylinder body, to improve the service life of the cylinder, so that the pipe end clamping structure can clamp various pipe bodies for a long time and with high frequency, to solve at least one of the above technical problems.

[0008] The technical scheme for solving the above problems is to provide a pipe end clamping structure, the clamping structure comprises:

[0009] The clamping cylinder comprises an integrated cylinder body, a first piston rod, a second piston rod and an end cover, the integrated cylinder body is provided with an intermediate partition plate, the intermediate partition plate divides the inner cavity of the integrated cylinder body into a first cavity and a second cavity which are in communication with each other, the first piston rod is movably arranged in the first cavity, the second piston rod is movably arranged in the second cavity, the first piston rod further has a piston rod through hole for the second piston rod to penetrate and connect, the second piston rod penetrates through the piston rod through hole to extend out from the same end of the integrated cylinder body as the first piston rod, and the end cover is installed at the port of the integrated cylinder body for the first piston rod and the second piston rod to extend out.

[0010] The clamping jaw mechanism comprises a first clamping jaw assembly and a second clamping jaw assembly, the first clamping jaw assembly is in transmission connection with the first piston rod, the second clamping jaw assembly is in transmission connection with the second piston rod, the first clamping jaw assembly and the second clamping jaw assembly each comprise two oppositely arranged clamping jaws, the first piston rod is movable to drive the two clamping jaws of the first clamping jaw assembly to close or open, and the second piston rod is movable to drive the two clamping jaws of the second clamping jaw assembly to close or open.

[0011] Further, the inside of the port of the integrated cylinder body for the first piston rod and the second piston rod is provided with a first limiting step for limiting the end cover, and a first abutting step is arranged on the outer circumferential sidewall of the end cover in a matched mode.

[0012] Further, the end cover is arranged on the inside of the port of the integrated cylinder body for the first piston rod and the second piston rod, the port of the integrated cylinder body for the first piston rod and the second piston rod is further provided with a second limiting step for limiting the end cover, and a limiting assembly for abutting and limiting the second limiting step in a reciprocal mode is detachably arranged on the end face of the end cover which faces the outside of the port of the integrated cylinder body.

[0013] Further, the limiting assembly comprises at least two arc-shaped pressing strips which are arranged in a spaced mode between the end cover and the second limiting step along the circumferential direction of the first piston rod or the second piston rod, and screw holes which are arranged on the arc-shaped pressing strips and the end cover, and the arc-shaped pressing strips are detachably installed on the end cover in a threaded mode.

[0014] Further, the limiting assembly further comprises abutting slopes arranged at at least one end of the at least one arc-shaped pressing strip and the at least one wedge-shaped pressing block, and screw holes are arranged on the wedge-shaped pressing block, and the wedge-shaped pressing block further pushes the arc-shaped pressing strips to abut against each other through the abutting slopes during being screwed on the end cover, so as to avoid loosening of the arc-shaped pressing strips.

[0015] Further, the intermediate partition plate is provided with an intermediate through hole, and the second piston rod is inserted into the intermediate through hole and then inserted through the piston rod through hole to extend to the outside of the integrated cylinder.

[0016] Further, the intermediate through hole is further provided with a protective sleeve, the protective sleeve is sleeved on the second piston rod, and the protective sleeve also seals the gap between the second piston rod and the intermediate through hole.

[0017] Further, a first transmission mechanism and a mounting support are arranged between the first clamping jaw assembly and the first piston rod, the first transmission mechanism comprises first L-shaped push rods, a first U-shaped push rod and first sliding seats, the first L-shaped push rods are arranged at two ends of the mounting support, the first U-shaped push rod is fixedly installed at the end of the extended part of the first piston rod, the first U-shaped push rod is provided with first insertion slots at two ends for the horizontal insertion of the lower ends of the first L-shaped push rods, the lower ends of the first L-shaped push rods are horizontally inserted into the insertion slots at the two ends of the first U-shaped push rod, the first sliding seats are oppositely arranged and slidably installed at the upper end of the mounting support, the lower end faces of the first sliding seats are provided with push holes, and the upper ends of the first L-shaped push rods pass through the mounting support and are upwardly inserted into the push holes of the first sliding seats.

[0018] Further, a second transmission mechanism is arranged between the second clamping jaw assembly and the second piston rod, the second transmission mechanism comprises second L-shaped push rods, a second U-shaped push rod and second sliding seats, the second L-shaped push rods are arranged at two ends of the mounting support, the second U-shaped push rod is fixedly installed at the end of the extended part of the second piston rod, the second U-shaped push rod is provided with push insertion slots at two ends for the horizontal insertion of the lower ends of the second L-shaped push rods, the lower ends of the second L-shaped push rods are horizontally inserted into the push insertion slots at the two ends of the second U-shaped push rod, the second sliding seats are oppositely arranged and slidably installed at the upper end of the mounting support, the lower end faces of the second sliding seats are provided with push holes, and the upper ends of the second L-shaped push rods pass through the mounting support and are upwardly inserted into the push holes of the second sliding seats.

[0019] Further, the first U-shaped push rod and the second U-shaped push rod are crosswise arranged along the axial direction of the first piston rod or the second piston rod.

[0020] The pipe end clamping structure has the advantages that:

[0021] 1. The split cylinder body is not used, but an integrated cylinder body is selected, so that the concentricity is ensured, the wear of the piston rod during reciprocating movement in the cylinder body is reduced, the service life of the clamping cylinder is prolonged, and the operation demand of long-term high-frequency repeated clamping of the pipe body is met.

[0022] 2. The limiting assembly for fixing the end cover is composed of a plurality of arc-shaped pressing strips; in this way, the technical personnel can use the spliced arc-shaped pressing strips to cooperate with the fixing of the end cover at the port of the integrated cylinder body from which the piston rod extends, and the wedge-shaped pressing blocks are used to tightly press the plurality of arc-shaped pressing strips, so that the arc-shaped pressing strips are tightly pressed against each other, and each arc-shaped pressing strip can be tightly pressed at the screw hole and used to fix the bolt for fixing the arc-shaped pressing strip, so as to further limit the radial movement of the end cover and improve the output power and use stability of the clamping cylinder.

[0023] 3. The upper end of the L-shaped push rod is entirely inserted into the pushing counterbore at the bottom of the sliding seat, and the lower end is entirely inserted into the pushing slot of the U-shaped push rod; the stress position of the L-shaped push rod is at the two ends, instead of the relatively low-structural-strength gear teeth, so that the structural strength of the transmission mechanism is improved while the transmission mechanism is simplified, and the actual clamping force of the clamping jaw mechanism is improved.

[0024] 4. The end cover is arranged on the inner side of the port of the integrated cylinder body, which provides convenience for the miniaturized clamping structure. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application. In these drawings, like reference numerals are used to represent similar elements. The drawings in the following description are some embodiments of the present application, not all embodiments. For those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0026] Figure 1 It is a whole structure diagram of the pipe end clamping structure of the embodiment;

[0027] Figure 2 It is a structure diagram of the clamping cylinder of the embodiment;

[0028] Figure 3 It is a sectional view of the clamping cylinder of the embodiment;

[0029] Figure 4 A sectional view of the integrated cylinder body of the present embodiment;

[0030] Figure 5 A structural diagram of the limiting assembly of the present embodiment;

[0031] Figure 6 A structural diagram of the clamping jaw mechanism of the present embodiment;

[0032] Figure 7 A structural diagram of the mounting support of the present embodiment;

[0033] 1-clamping cylinder, 11-integrated cylinder body, 111-first limiting step, 112-second limiting step, 12-first piston rod, 121-piston rod through hole, 13-second piston rod, 14-end cover, 141-first abutting step, 15-intermediate partition plate, 151-protection shaft sleeve, 16-first cavity, 17-second cavity, 18-limiting assembly, 181-arc-shaped pressing strip, 182-wedge-shaped pressing block, 183-abutting inclined surface;

[0034] 2-clamping jaw mechanism, 21-first clamping jaw assembly, 22-second clamping jaw assembly, 23-first transmission mechanism, 231-first L-shaped push rod, 232-first U-shaped push rod, 233-first sliding seat, 24-second transmission mechanism, 241-second L-shaped push rod, 242-second U-shaped push rod, 243-second sliding seat, 25-mounting support, 26-pushing slot, 27-pushing counterbore. DETAILED DESCRIPTION

[0035] In the present specification, the orientation terms such as up, down, left, right, front, back, front face, back face, top, bottom, etc. mentioned or possibly mentioned are defined with respect to the configuration shown in the drawings, and the words “inner” and “outer” respectively refer to the direction towards or away from the geometric center of a particular component, which are relative concepts, so it is possible that they will change accordingly according to different positions, different use states. Therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0036] Please refer to Figure 1 and Figure 2The utility model discloses a pipe end clamping structure, its characterized in that, the clamping structure includes clamping pneumatic cylinder 1 and clamping jaw mechanism 2, and clamping jaw mechanism 2 includes the first jaw assembly 21 and the second jaw assembly 22 of independent operation each other, and the first jaw assembly 21 and the second jaw assembly 22 all include two oppositely arranged clamping jaws, and clamping pneumatic cylinder 1 has first piston rod 12 and second piston rod 13, and the rod end of first piston rod 12 that stretches out to the outside of clamping pneumatic cylinder 1 is connected with the first jaw assembly 21 through first transmission mechanism 23 and is driven by each other, and the rod end of second piston rod 13 that stretches out to the outside of clamping pneumatic cylinder 1 is connected with the second jaw assembly 22 through second transmission mechanism 24 and is driven by each other, and clamping pneumatic cylinder 1 passes through first piston rod 12 and first transmission mechanism 23 to drive the two clamping jaws of first jaw assembly 21 relative movement and close or open, makes first jaw assembly 21 clamp in the pipe end of pipe body or put down pipe body, and clamping pneumatic cylinder 1 passes through second piston rod 13 and second transmission mechanism 24 to drive the two clamping jaws of second jaw assembly 22 also relative movement and close or open, makes first jaw assembly 21 clamp in the pipe end of pipe body or put down pipe body.

[0037] In addition, in the embodiment, the clamping pneumatic cylinder 1 can also operate the first piston rod 12 and the second piston rod 13 simultaneously, and further make the first jaw assembly 21 and the second jaw assembly 22 cooperate with each other to clamp the pipe end of the pipe body.

[0038] Specifically, please refer to Figure 2 and Figure 3 , as shown in the orientation shown in Figure 3 , in the embodiment, the clamping pneumatic cylinder 1 includes an integrated cylinder body 11, a first piston rod 12, a second piston rod 13, and an end cover 14; the left end of the integrated cylinder body 11 is fixedly installed with a pneumatic cylinder base, the middle part of the integrated cylinder body 11 is installed with the end cover 14, the ports are correspondingly arranged at the middle part position of the integrated cylinder body 11, and the middle part of the cavity located at the left side of the end cover 14 in the integrated cylinder body 11 is further provided with an intermediate partition plate 15 with a through hole, the cavity located at the left side of the end cover 14 in the integrated cylinder body 11 is divided into a first cavity 16 and a second cavity 17 by the intermediate partition plate 15, the first piston rod 12 is movably arranged in the first cavity 16 at the right side of the intermediate partition plate 15, and the second piston rod 13 is movably arranged in the second cavity 17 at the left side of the intermediate partition plate 15; part of the rod body of the first piston rod 12 passes through the end cover 14 to stretch out to the right to the cavity located at the right side of the end cover 14 of the integrated cylinder body 11, the middle part of the first piston rod 12 is further axially provided with a piston rod through hole 121, part of the rod body of the second piston rod 13 passes through the piston rod through hole 121, and the right end of the first piston rod 12 is exposed and stretches out to the right of the end cover 14 to the cavity located at the right side of the end cover 14 of the integrated cylinder body 11.

[0039] Moreover, the mounting support 25 is fixedly arranged at the right end of the integrated cylinder body 11, and the first transmission mechanism 23 and the second transmission mechanism 24 are arranged on the mounting support 25. The first piston rod 12 is fixedly connected with the first U-shaped push rod 232 of the first transmission mechanism 23 at the left side of the mounting support 25, and the second piston rod 13 is also fixedly connected with the second U-shaped push rod 242 of the second transmission mechanism 24 at the left side of the mounting support 25.

[0040] Further, please refer to Figure 3 and Figure 4 , and refer to the orientation shown in Figure 3 , in the embodiment, the inner side of the port of the integrated cylinder body 11, i.e. the left side of the port, where the first piston rod 12 and the second piston rod 13 extend out, is further provided with a first limiting step 111 annularly protruding on the inner wall of the left side of the port of the integrated cylinder body 11. The middle part of the outer circumferential side wall of the end cover 14 is provided with a first abutting step 141 annularly protruding to the right. The diameter of the first abutting step 141 is greater than the inner diameter of the first limiting step 111. The inner diameter of the port is greater than the diameter of the end cover 14. The port is further provided with a second limiting step 112 with an inner diameter greater than the diameter of the end cover 14. The right end surface of the end cover 14 is further detachably and fixedly provided with a limiting assembly 18 radially extending to the outside of the edge of the end cover 14 and capable of forming a stop with the second limiting step 112.

[0041] In this regard, when the technicians perform the step of fixedly installing the end cover 14 in the assembly forming process of the clamping cylinder 1, the technicians can first sleeve the end cover 14 on the first piston rod 12, and then plug the end cover 14 into the left side of the port. First, the first abutting step 141 of the outer circumference of the end cover 14 is abutted and limited with the first limiting step 111. Then, the limiting assembly 18 is fixedly installed on the right end surface of the end cover 14, so that the limiting assembly 18 is clamped between the right end surface of the end cover 14 and the second limiting step 112, thereby fixedly installing the end cover 14. Similarly, the technicians can also first detach the limiting assembly 18 to loosen the end cover 14.

[0042] Please refer to Figure 2 , Figure 3 , Figure 5 , and refer to the orientation shown in Figure 5 , in the embodiment, the limiting assembly 18 includes three arc-shaped pressing strips 181 and three wedge-shaped pressing blocks 182. Each arc-shaped pressing strip 181 is provided with two screw holes for screw insertion. Each wedge-shaped pressing block 182 is provided with one screw hole for screw insertion.

[0043] In addition, along the counterclockwise direction, the tail end of each arc-shaped pressing strip is also provided with an abutting inclined surface 183 which can be adapted with the side end inclined surface of the wedge-shaped pressing block 182.

[0044] To this end, the skilled in the art can use bolts to pass through the screw holes on the arc-shaped pressing strip 181 to sequentially fix the three arc-shaped pressing strips 181 on the end cover 14 in the counterclockwise direction, and then use bolts to fix a wedge-shaped pressing block 182 between every two adjacent arc-shaped pressing strips 181, and in the process of tightening the bolts to fix the wedge-shaped pressing block 182, the side end of the wedge-shaped pressing block 182 will push the abutting inclined surface 183 to push the arc-shaped pressing strip 181 to move horizontally on the end surface of the end cover 14 until the arc-shaped pressing strip 181 is laterally abutting tightly with the bolt that fixes the arc-shaped pressing strip 181, thereby stably cooperating with the end cover 14.

[0045] In other embodiments, the number of arc-shaped pressing strips 181 can also be two or four or even more, and the number of wedge-shaped pressing blocks 182 does not exceed the specific number of gaps between adjacent arc-shaped pressing strips 181; for example, when the arc-shaped pressing strip 181 is provided with three, the wedge-shaped pressing block 182 can also be provided with only two or one, and when the wedge-shaped pressing block 182 is not provided between the adjacent arc-shaped pressing strips 181, the adjacent arc-shaped pressing strips 181 are directly abutting tightly.

[0046] Further, please refer to Figure 3 In order to facilitate the axial movement of the second piston rod 13, a protective shaft sleeve 151 is further provided at the middle through hole, and the protective shaft sleeve 151 is further sleeved on the second piston rod 13.

[0047] To this end, the protective shaft sleeve 151 can close the gap between the second piston rod 13 and the middle through hole, so as to further isolate the first cavity 16 and the second cavity 17, so that the first cavity 16 cooperates with the first piston rod 12 and the second cavity 17 cooperates with the second piston rod 13 to form independent operation units.

[0048] Please refer to Figure 6 and Figure 7 , refer to Figure 6 As shown in the orientation, in the present embodiment, two first sliding grooves are oppositely provided at the upper end surface of the mounting support 25, and a first sliding seat 233 is slidingly installed in each of the two first sliding grooves. The upper end surfaces of the two first sliding seats 233 are exposed at the upper end surface of the mounting support 25, and a clamping jaw is fixedly installed at the upper end surface of each of the two first sliding seats 233. The two clamping jaws are oppositely arranged. A passage is provided at the bottom of each of the two first sliding grooves, which communicates to the lower end surface of the mounting support 25. A first L-shaped lever 231 is rotatably installed at each of a pair of opposite side positions of the lower end of the mounting support 25. The upper ends of the two first L-shaped levers 231 pass through the passages and are respectively inserted into the bottom of a first sliding seat 233 and extend into a driving recess 27 provided at the bottom of the first sliding seat 233. The horizontal rod portions of the lower ends of the two first L-shaped levers 231 extend outwardly of the mounting support 25 and respectively extend into the driving insertion grooves 26 at the two ends of the first U-shaped lever 232.

[0049] In this embodiment, the countersunk hole 27 is larger than the upper body portion of the first L-shaped lever 231, the countersunk slot 26 is also larger than the laterally extended body portion of the lower end of the first L-shaped lever 231, the channel is also larger than the upper body portion of the first L-shaped lever 231, and the channel size is also fully adapted to the swing stroke of the first L-shaped lever 231.

[0050] In response, when the clamping cylinder 1 operates to drive the first piston rod 12 to extend, the first piston rod 12 will drive the first U-shaped lever 232 to move away from the clamping cylinder 1. The first U-shaped lever 232 will correspondingly cause the two first L-shaped levers 231 to rotate around their hinge point, so that the upper ends of the two first L-shaped levers 231 rotate and move closer to each other, thereby driving the two first slide blocks 233 and the grippers on them to move and move closer to each other to clamp the tube end of the tube body; otherwise, the tube body will be released.

[0051] Additionally, please see Figure 6 and Figure 7 , refer to Figure 6 As shown in the diagram, in this embodiment, two second sliding grooves are also formed on the upper surface of the mounting support 25. A second slide block 243 is slidably installed in each of the two second sliding grooves. The upper surfaces of both second slide blocks 243 are exposed above the upper surface of the mounting support 25, and a clamp is fixedly installed on the upper surface of each second slide block 243, with the two clamps also positioned opposite each other. A channel connecting to the lower surface of the mounting support 25 is formed at the bottom of each of the two second sliding grooves. At the lower end, a set of opposite side positions are each hinged and rotatably mounted with a second L-shaped lever 241. The upper ends of the two second L-shaped levers 241 pass through the channel to be inserted into the bottom of a second slide block 243 and extend into the actuation countersunk hole 27 opened at the bottom of the second slide block 243. The horizontal rods at the lower ends of the two second L-shaped levers 241 extend outward from the mounting support 25 and extend into the actuation slots 26 at both ends of the second U-shaped lever 242.

[0052] In this embodiment, the countersunk hole 27 is larger than the upper body portion of the second L-shaped lever 241, the countersunk slot 26 is also larger than the laterally extended body portion of the lower end of the second L-shaped lever 241, the channel is also larger than the upper body portion of the second L-shaped lever 241, and the channel size is also fully adapted to the swing stroke of the second L-shaped lever 241.

[0053] When the clamping cylinder 1 works to drive the second piston rod 13 to extend, the second piston rod 13 drives the second U-shaped lever 242 to move away from the clamping cylinder 1, and the second U-shaped lever 242 correspondingly drives the two second L-shaped levers 241 to rotate around the hinge points thereof, so that the upper ends of the two second L-shaped levers 241 rotate towards each other, and then drives the two second sliding blocks 243 and the clamping jaws thereon to move towards each other to clamp the pipe end of the pipe body; conversely, the pipe body is released.

[0054] Please refer to Figure 2 , Figure 3 , Figure 6 In the embodiment, the first U-shaped lever 232 and the second U-shaped lever 242 are arranged orthogonally; and in order to enable the first piston rod 12 to avoid the second U-shaped lever 242 and be connected with the first U-shaped lever 232, an axial connecting recess is formed at the end of the extending rod body portion of the first piston rod 12, and the second U-shaped lever 242 extends into the connecting recess to be fixedly connected with the end of the extending rod body portion of the second piston rod 13.

[0055] It should be noted that in the embodiment, the operation principle of the first piston rod 12 in the first cavity 16 and the operation principle of the second piston rod 13 in the second cavity 17 are completely same as the operation principle of the existing single-piston-rod cylinder, and thus are not described herein.

[0056] The above-mentioned matters not mentioned are applicable to the prior art.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some of the technical features thereof; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A pipe end gripping structure characterized by comprising: The clamping structure comprises: The clamping cylinder (1) comprises an integrated cylinder body (11), a first piston rod (12), a second piston rod (13), and an end cover (14). The integrated cylinder body (11) is provided with an intermediate partition plate (15) inside. The intermediate partition plate (15) divides the inner cavity of the integrated cylinder body (11) into a first cavity (16) and a second cavity (17) that are in communication with each other. The first piston rod (12) is movably arranged in the first cavity (16), and the second piston rod (13) is movably arranged in the second cavity (17). The first piston rod (12) further has a piston rod through hole (121) for the second piston rod (13) to pass through and connect. The second piston rod (13) passes through the piston rod through hole (121) to extend from the same end of the first piston rod (12) from the integrated cylinder body (11). The end cover (14) is installed at the port of the integrated cylinder body (11) for the first piston rod (12) and the second piston rod (13) to extend. The clamping jaw mechanism (2) comprises a first clamping jaw assembly (21) and a second clamping jaw assembly (22). The first clamping jaw assembly (21) is in transmission connection with the first piston rod (12), and the second clamping jaw assembly (22) is in transmission connection with the second piston rod (13). The first clamping jaw assembly (21) and the second clamping jaw assembly (22) each comprise two oppositely arranged clamping jaws. The first piston rod (12) is movable to drive the two clamping jaws of the first clamping jaw assembly (21) to close or open. The second piston rod (13) is movable to drive the two clamping jaws of the second clamping jaw assembly (22) to close or open.

2. The pipe end gripping structure according to claim 1, wherein The inner side of the port of the integrated cylinder body (11) for the first piston rod (12) and the second piston rod (13) to extend is provided with a first limiting step (111) for limiting the end cover (14). A first abutting step (141) is arranged on the outer circumferential side wall of the end cover (14) in a matching manner.

3. The pipe end gripping structure according to Claim 1, wherein The end cover (14) is arranged inside the port of the integrated cylinder body (11) for the first piston rod (12) and the second piston rod (13) to extend. The port of the integrated cylinder body (11) for the first piston rod (12) and the second piston rod (13) to extend is further provided with a second limiting step (112) for limiting the end cover (14). A limiting assembly (18) for abutting and limiting with the second limiting step (112) is detachably arranged on the end face of the end cover (14) facing the outer side of the port of the integrated cylinder body (11).

4. The pipe end gripping structure according to claim 3, wherein The limiting assembly (18) comprises at least two arc-shaped pressing strips (181) arranged in a spaced manner between the end cover (14) and the second limiting step (112) along the circumferential direction of the first piston rod (12) or the second piston rod (13), and screw holes formed on the arc-shaped pressing strips (181) and the end cover (14). The arc-shaped pressing strips (181) are detachably installed on the end cover (14) in a threaded manner.

5. The pipe end gripping structure according to claim 4, wherein The limiting assembly (18) further comprises at least one wedge-shaped pressing block (182) and an abutting slope (183) arranged at at least one end of the arc-shaped pressing strip (181), the wedge-shaped pressing block (182) is also provided with a threaded hole, and the wedge-shaped pressing block (182) further pushes the arc-shaped pressing strips (181) to abut against each other through the abutting slope (183) during the threaded installation on the end cover (14), so as to avoid loosening of the arc-shaped pressing strips (181).

6. The pipe end gripping structure according to Claim 1, wherein The intermediate partition plate (15) is provided with an intermediate through hole, the second piston rod (13) is first inserted into the intermediate through hole and then inserted through the piston rod through hole (121) to extend to the outside of the integrated cylinder body (11).

7. The pipe end gripping structure according to Claim 6, wherein The intermediate through hole is further provided with a protective sleeve (151), the protective sleeve (151) is sleeved on the second piston rod (13), and the protective sleeve (151) also seals the gap between the second piston rod (13) and the intermediate through hole.

8. The pipe end gripping structure according to Claim 1, wherein A first transmission mechanism (23) and a mounting support (25) are arranged between the first clamping jaw assembly (21) and the first piston rod (12), the first transmission mechanism (23) comprises a first L-shaped push rod (231), a first U-shaped push rod (232) and a first sliding seat (233), the first L-shaped push rod (231) is provided with two, both of which are rotationally arranged at the lower end of the mounting support (25), and both of which are arranged back to back, the first U-shaped push rod (232) is fixedly installed at the end of the extended portion of the first piston rod (12), both ends of the first U-shaped push rod (232) are provided with a push insertion slot (26) for transversely inserting the lower end of the first L-shaped push rod (231) therein, the lower ends of the two first L-shaped push rods (231) are respectively transversely inserted into the push insertion slots (26) at both ends of the first U-shaped push rod (232), and the two first sliding seats (233) are oppositely arranged and slidably installed at the upper end of the mounting support (25), the lower end surface of each of the two first sliding seats (233) is provided with a push recess (27), and the upper end of each of the two first L-shaped push rods (231) passes through the mounting support (25) to be upwardly inserted into the push recess (27) of one of the first sliding seats (233).

9. The pipe end gripping structure according to Claim 8, wherein The second jaw assembly (22) is provided with a second transmission mechanism (24) between the second piston rod (13), the second transmission mechanism (24) comprises a second L-shaped lever (241), a second U-shaped lever (242) and a second sliding seat (243), the second L-shaped lever (241) is provided with two, two second L-shaped levers (241) are rotationally arranged at the lower end of the mounting support (25), two second L-shaped levers (241) are arranged back to back, the second U-shaped lever (242) is fixedly installed at the end of the protruding part of the second piston rod (13), both ends of the second U-shaped lever (242) are provided with a lever insertion slot (26) for the horizontal insertion of the lower end of the second L-shaped lever (241), the lower end of two second L-shaped levers (241) is respectively horizontally inserted into the lever insertion slot (26) at both ends of the second U-shaped lever (242), two second sliding seats (243) are oppositely arranged and are slidingly installed at the upper end of the mounting support (25), the lower end surface of two second sliding seats (243) is provided with a lever insertion hole (27), the upper end of two second L-shaped levers (241) passes through the mounting support (25) to be upwardly inserted into the lever insertion hole (27) of one second sliding seat (243).

10. The pipe end gripping structure according to Claim 9, wherein The first U-shaped lever (232) and the second U-shaped lever (242) are cross-shaped arranged along the axis direction of the first piston rod (12) or the second piston rod (13).

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