CN217570585U

CN217570585U - Pipe contracting machine claw material mechanism

Info

Publication number: CN217570585U
Application number: CN202221438399.8U
Authority: CN
Inventors: 李萍; 孙国兴
Original assignee: ZHANGJIAGANG XINGYU MACHINERY MANUFACTURING CO LTD
Current assignee: ZHANGJIAGANG XINGYU MACHINERY MANUFACTURING CO LTD
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2022-10-14
Anticipated expiration: 2032-06-10

Abstract

The utility model discloses a pipe contracting machine claw material mechanism, include: the work or material rest, by controlling the combined displacement structure that sliding structure, front and back sliding structure and elevation structure constitute, the mounting platform that presss from both sides on the pipe assembly passes through combined displacement structure to be installed on the work or material rest, presss from both sides the pipe assembly and becomes: at least two groups of claw material structures are arranged at the bottom of the safety platform at intervals from front to back; every group claw material structure includes: the clamping device comprises a mounting seat, a pair of clamping jaws and a plurality of semi-cylindrical clamping components, wherein the mounting seat is fixedly mounted at the bottom of the fixed platform and provided with a mounting cavity, the outer contour of each pair of clamping components is correspondingly matched with the inner contour of a clamping opening of the corresponding clamping jaw, and the inner cavity apertures of each pair of clamping components are different; the pair of clamping jaws is movably arranged in the mounting cavity of the mounting base through a sliding structure, and a driving structure for driving the two clamping jaws to move in the opposite direction or in the opposite direction is arranged between the mounting platform and the mounting cavity. The mechanism is simple in structure, convenient to use and suitable for conveying pipe fitting blanks of various sizes.

Description

Pipe contracting machine claw material mechanism

Technical Field

The utility model relates to an automatic feeding mechanism especially relates to a pipe contracting machine claw material mechanism.

Background

The pipe reducing machine is pipe end forming equipment for expanding and reducing pipe end faces of pipe fittings under normal conditions. The die is a core part of the pipe shrinking machine, pipe end forming processing such as pipe expanding, pipe shrinking, bulging, rib upsetting and the like can be performed on a pipe blank by replacing the corresponding die, and the die is widely applied to processing and forming of connecting parts such as pipe fittings, automobile oil pipes, air pipes, water pipes, air conditioner pipes and the like.

In the face of different forming and processing requirements, matched dies need to be replaced on the pipe reducing machine, sizes such as outer pipe diameters and pipe lengths of pipe blank corresponding to different dies inevitably have differences, at present, no automatic feeding mechanism aiming at pipe blank of various sizes exists, the pipe blank feeding mode of various sizes still adopts the traditional manual feeding mode, but the manual feeding mode has the defects of low working efficiency, high labor intensity, potential safety hazards and the like.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the required technical problem who solves is: the pipe shrinking machine claw material mechanism is simple in structure and capable of conveying pipe fitting blanks of various sizes.

In order to solve the problem, the utility model adopts the technical scheme that: the pipe contracting machine claw material mechanism include: the pipe clamping assembly is arranged on the material rack through the combined displacement structure and can move forwards or backwards or leftwards or rightwards or upwards or downwards relative to the material rack through the combined displacement structure, so that displacement in six directions is realized. The pipe clamping assembly comprises: the mounting platform is mounted on the material rack through a combined displacement structure, and at least two groups of claw material structures are sequentially arranged on the mounting platform from front to back at intervals. Every group claw material structure includes: the clamping device comprises a mounting seat with a mounting cavity at the bottom, a pair of clamping jaws and a plurality of semi-cylindrical clamping components, wherein the outer contour of each pair of clamping components is correspondingly matched with the inner contour of a clamping port of the corresponding clamping jaw, the bore diameters of the inner cavities of each pair of clamping components are different, detachable connecting structures for fixing the pair of clamping components in the clamping ports of the corresponding clamping jaws are arranged between each pair of clamping components and the corresponding clamping jaws, when the clamping device is used, a pair of clamping components with the sizes matched with pipe fitting blanks with different sizes are selected, and then the pair of clamping components are respectively mounted in the clamping ports of the two clamping jaws through the detachable connecting structures. The mounting seat is fixedly mounted at the bottom of the mounting platform, the pair of clamping jaws is movably mounted in the mounting cavity of the mounting seat through a sliding structure, and the clamping ports of the two clamping jaws are located below the mounting cavity. And a driving structure is arranged between the mounting platform and the mounting cavity, and under the driving of the driving structure, the two clamping jaws can clamp the pipe blank positioned at the clamping ports of the two clamping jaws after moving oppositely through the sliding structure, or loosen the pipe blank positioned at the clamping ports of the two clamping jaws after moving away.

For convenience of description, the two jaws of a pair of jaws are defined as: left clamping jaw and right clamping jaw. The driving structure is as follows: the pipe clamping oil cylinder is fixedly arranged at the top of the mounting platform, an extension rod of the pipe clamping oil cylinder penetrates through a corresponding through hole on the mounting platform and then extends downwards, a connecting seat is fixedly arranged at the bottom of the extension rod of the pipe clamping oil cylinder, a front connecting rod is arranged at the front end of the bottom of the connecting seat, and a rear connecting rod is arranged at the rear end of the bottom of the connecting seat; one end of a first front hinged rod is hinged to a hinged seat at the front end of the top of the left clamping jaw, the other end of the first front hinged rod is hinged to the bottom of the front connecting rod, one end of a second front hinged rod is hinged to a hinged seat at the front end of the top of the right clamping jaw, and the other end of the second front hinged rod is hinged to the hinged position of the front connecting rod and the first front hinged rod; one end of the first rear portion hinge rod is hinged to the hinge seat at the rear end of the top of the left clamping jaw, the other end of the first rear portion hinge rod is hinged to the bottom of the rear portion connecting rod, one end of the second rear portion hinge rod is hinged to the hinge seat at the rear end of the top of the right clamping jaw, and the other end of the second rear portion hinge rod is hinged to the hinge position of the rear portion connecting rod and the first rear portion hinge rod.

The sliding structure has multiple structural forms, and the sliding structure in the scheme preferentially adopts the following structure: a first sliding groove with a long edge placed in the left-right direction is formed inwards on the front side wall of the mounting cavity, a second sliding groove with a long edge placed in the left-right direction is formed inwards on the rear side wall of the mounting cavity, first long-strip sliding blocks which protrude outwards and can movably extend into the first sliding grooves are arranged on the front side walls of the two clamping jaws, and second long-strip sliding blocks which protrude outwards and can movably extend into the second sliding grooves are arranged on the rear side walls of the two clamping jaws; when the two clamping jaws move towards or away from each other under the driving of the driving structure, the first long-strip sliding block slides along the first sliding groove, and the second long-strip sliding block slides along the second sliding groove.

Wherein, the position relation of sliding structure, front and back sliding structure and elevation structure three about among the combined displacement structure specifically is: the movable frame is arranged at the top of the material rack through a front-back sliding structure and can move forwards or backwards relative to the material rack through the front-back sliding structure; the movable plate is arranged at the top of the movable frame through a left-right sliding structure and can move leftwards or rightwards relative to the movable frame through the left-right sliding structure; the lifting structure is arranged between the moving plate and the mounting platform, and the mounting platform can move upwards or downwards relative to the moving plate through the lifting structure.

The front and back sliding structure has multiple forms, and the front and back sliding structure in the scheme preferentially adopts the following structure: the left side and the right side of the top surface of the material rack are respectively provided with an inverted T-shaped guide rail, the long side of each inverted T-shaped guide rail is placed in the front-back direction, and the left side and the right side of the bottom surface of the movable rack are respectively provided with at least two first sliding blocks movably arranged in the corresponding inverted T-shaped guide rails; the middle part of the rear end of the material rack is fixedly provided with a fixed seat with a threaded through hole, the screw rod is arranged in the threaded through hole in a rotating manner, and the front end of the screw rod is fixedly connected to the middle part of the rear end of the movable rack.

The left and right sliding structure has various forms, and the left and right sliding structure in the scheme preferentially adopts the following structure: the front side and the rear side of the bottom surface of the movable plate are respectively provided with a linear guide rail, the guide rails on the linear guide rails are fixed at the top of the movable frame, and the long edges are arranged in the left-right direction. Each linear guide rail is provided with at least two second sliding blocks, and each second sliding block on each linear guide rail is fixed at the bottom of the right moving plate; a horizontally placed driving oil cylinder is fixedly arranged in the middle of the right end of the movable frame, and an extension rod of the driving oil cylinder extends leftwards and then is fixedly connected to the middle of the right end of the movable plate.

The lifting structure has multiple forms, and the lifting structure in the scheme preferentially adopts the following structure: the lifting oil cylinder is fixedly arranged in the center of the top surface of the moving plate, and an extension rod of the lifting oil cylinder penetrates through a corresponding through hole in the moving plate, extends downwards and is fixedly connected to the center of the top surface of the mounting platform; the mounting platform is driven to move downwards in the process that the extension rod of the lifting oil cylinder extends downwards, and the mounting platform is driven to move upwards in the process that the extension rod of the lifting oil cylinder retracts upwards; a guide structure for guiding the mounting platform to ascend or descend is further arranged between the moving plate and the mounting platform.

Guide structure also has multiple structural style, and this scheme is provided with a guide structure respectively at the front side and the rear side that are located lift cylinder, and every guide structure includes: the bottom ends of the guide rods respectively penetrate through corresponding guide holes in the moving plate and then extend downwards and are fixedly connected to the top of the mounting platform, the top ends of the guide rods are fixedly connected to the bottom of the upper connecting plate, and the axis of each guide rod is parallel to the axis of an extension rod of the lifting oil cylinder.

Certainly, in order to reduce the abrasion of the guide holes, a sliding sleeve can be sleeved in each guide hole, and each guide rod is movably inserted into the corresponding sliding sleeve. The sliding sleeve can also be made of a self-lubricating material so as to improve the sliding smoothness of the guide rod relative to the corresponding sliding sleeve.

The beneficial effects of the utility model are that: simple structure, convenient to use selects a pair of centre gripping subassembly that matches with it size to the pipe fitting blank of unidimensional during the use, then installs respectively in the centre gripping mouth of two clamping jaws with this pair of centre gripping subassembly through dismantling connection structure, can carry the pipe fitting blank of this size, is applicable to the transport of multiple size pipe fitting blank.

Drawings

Fig. 1 is a schematic structural diagram of the pipe shrinking machine claw material mechanism of the present invention.

Fig. 2 is a partial schematic view of the pair of jaws of fig. 1 with portions of the mounting block removed and in a clamped position.

FIG. 3 is a partial schematic view of the pair of jaws shown in FIG. 1 with the mounting block partially removed and in a relaxed state.

Fig. 4 isbase:Sub>A partial structural view in the sectional direction ofbase:Sub>A-base:Sub>A in fig. 1.

Fig. 5 is a partial structure schematic diagram of one group of claw material structures.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the accompanying drawings and preferred embodiments.

Example one

For convenience of description, the directions of fig. 1 are defined as "left", "right", "up" and "down" in this embodiment, and at this time, the direction at the left part in fig. 4 is "front", and the direction at the right part in fig. 4 is "back". All directions referred to throughout this document shall be deemed to be covered herein.

As shown in fig. 1 and 4, the pipe reducing machine claw material mechanism according to the embodiment includes: the pipe clamping assembly comprises a material rack 1 and a combined displacement structure formed by combining a left-right sliding structure, a front-back sliding structure and a lifting structure, wherein the pipe clamping assembly is arranged on the material rack 1 through the combined displacement structure, and can move forwards or backwards or leftwards or rightwards or upwards or downwards relative to the material rack 1 through the combined displacement structure, so that the aim of displacement of the pipe clamping assembly in six directions is fulfilled.

As shown in fig. 4, the pipe clamping assembly of the present embodiment includes: and the mounting platform 4 is mounted on the material rack 1 through a combined displacement structure. At least two groups of claw material structures are sequentially arranged on the mounting platform 4 from front to back at intervals. Generally, the use requirements can be met by adopting two groups of claw material structures, and the number of the claw material structures can be correspondingly increased according to actual use working conditions.

As shown in fig. 1, fig. 2, fig. 3 and fig. 5, each group of claw material structures includes: the clamping device comprises a mounting seat 5 with a mounting cavity at the bottom, a pair of clamping jaws 6 and a plurality of half-and-half cylindrical clamping components 9, wherein the outer contour of each pair of clamping components 9 is correspondingly matched with the inner contour of a clamping opening of the corresponding pair of clamping jaws 6, the inner cavity apertures of each pair of clamping components 9 are different, and a detachable connecting structure for fixing the pair of clamping components 9 in the clamping opening of the corresponding pair of clamping jaws 6 is arranged between each pair of clamping components 9 and the corresponding pair of clamping jaws 6. The detachable connecting structure can adopt a bolt structure, so that the edge of the clamping assembly 9 extends outwards to form a flange structure 91, a threaded hole is formed in the clamping jaw 6 opposite to the through hole in the flange structure 91, and each bolt penetrates through the corresponding through hole in the flange structure 91 and then is screwed on the corresponding threaded hole, so that the clamping assembly 9 is fixed in the clamping opening of the corresponding clamping jaw 6. When in use, a pair of clamping components 9 matched with the sizes of pipe blanks with different sizes are selected, and then the clamping components 9 are respectively arranged in the clamping mouths of the two clamping jaws 6 through the detachable connecting structures. Therefore, the purpose that the same pipe reducing machine claw material mechanism can convey pipe fittings blanks of various sizes can be met.

The mounting base 5 is fixedly mounted at the bottom of the mounting platform 4, the pair of clamping jaws 6 is movably mounted in a mounting cavity of the mounting base 5 through a sliding structure, and a driving structure for driving the two clamping jaws 6 to move towards each other through the sliding structure to clamp the pipe blank or to move away from the pipe blank to loosen the pipe blank is arranged between the mounting platform 4 and the mounting cavity. Here, the mounting seat 5 may be formed by two parallel mounting plates 51 arranged at intervals, and the two mounting plates 51 are fixed at the bottom of the mounting platform 4, and the space between the two mounting plates 51 forms a mounting cavity.

As shown in fig. 2, 3 and 5, the slip structure has a plurality of structural forms, and the slip structure in the present embodiment preferably adopts the following structure: inwards offer the first spout 501 that long limit is left right direction and puts on the preceding lateral wall of installation cavity, inwards offer the second spout 502 that long limit is left right direction and puts on the back lateral wall of installation cavity, all be provided with outside convex on the preceding lateral wall of two clamping jaws 6, can the activity stretch into first spout 501 in first rectangular slider 601, all be provided with outside convex on the back lateral wall of two clamping jaws 6, can the activity stretch into the rectangular slider 602 of second in second spout 502. When the two clamping jaws 6 move towards or away from each other under the driving of the driving structure, the first long sliding block 601 slides along the first sliding groove 501, and the second long sliding block 602 slides along the second sliding groove 502.

For convenience of description, the two jaws of the pair of jaws 6 are defined herein as: a left jaw 61 and a right jaw 62. As shown in fig. 2, 3 and 4, the driving structure is: the pipe clamping oil cylinder 7 is fixedly arranged at the top of the mounting platform 4, an extension rod 71 of the pipe clamping oil cylinder 7 penetrates through a corresponding through hole in the mounting platform 4 and then extends downwards, a connecting seat 72 is fixedly arranged at the bottom of the extension rod 71 of the pipe clamping oil cylinder 7, a front connecting rod 721 is arranged at the front end of the bottom of the connecting seat 72, and a rear connecting rod 722 is arranged at the rear end of the bottom of the connecting seat 72. One end of the first front hinge rod 73 is hinged on the hinge seat 612 at the front end of the top of the left clamping jaw 61, the other end is hinged at the bottom of the front connecting rod 721, one end of the second front hinge rod 74 is hinged on the hinge seat 622 at the front end of the top of the right clamping jaw 62, and the other end is hinged at the hinge part A of the front connecting rod 721 and the first front hinge rod 73; one end of the first rear hinged rod is hinged to the hinged seat at the rear end of the top of the left clamping jaw 61, the other end of the first rear hinged rod is hinged to the bottom of the rear connecting rod 722, one end of the second rear hinged rod 741 is hinged to the hinged seat at the rear end of the top of the right clamping jaw 62, and the other end of the second rear hinged rod is hinged to the hinged position B of the rear connecting rod 722 and the first rear hinged rod.

When the pipe clamping cylinder 7 works, the extension rod 71 of the pipe clamping cylinder 7 extends downwards to push the front connecting rod 721 and the rear connecting rod 722 to move downwards synchronously, so that the first front hinge rod 73 and the second front hinge rod 74 rotate and gather around the hinge A in the direction close to the front connecting rod 721, the first rear hinge rod 741 and the second rear hinge rod 741 rotate and gather around the hinge B in the direction close to the rear connecting rod 722, and the left clamping jaw 61 and the right clamping jaw 62 are pulled to move oppositely, as shown in fig. 2, the structure schematic diagram is that the left clamping jaw 61 and the right clamping jaw 62 move oppositely to be in a clamping state. The extending rod 71 of the pipe clamping cylinder 7 retracts upwards, the front connecting rod 721 and the rear connecting rod 722 are pulled to move upwards synchronously, so that the first front hinge rod 73 and the second front hinge rod 74 rotate and expand around the hinge A in the direction away from the front connecting rod 721, the first rear hinge rod 741 rotates and expands around the hinge B in the direction away from the rear connecting rod 722, and the left clamping jaw 61 and the right clamping jaw 62 are pushed to move away from each other, as shown in fig. 3, the structure of the left clamping jaw 61 and the right clamping jaw 62 move away from each other to be in a completely loosened state is schematically illustrated.

Example two

In this embodiment, details of the combined displacement structure are expanded on the basis of the first embodiment. The position relation of the left-right sliding structure, the front-back sliding structure and the lifting structure in the combined displacement structure is as follows: remove frame 2 and install in work or material rest 1 top through sliding structure around, and remove frame 2 and can move forward or backward for work or material rest 1 through sliding structure around. The moving plate 3 is mounted on the top of the moving frame 2 through a left-right sliding structure, and the moving plate 3 can move left or right relative to the moving frame 2 through the left-right sliding structure. The lifting structure is arranged between the moving plate 3 and the mounting platform 4, and the mounting platform 4 can move upwards or downwards relative to the moving plate 3 through the lifting structure.

As shown in fig. 1 and 4, the forward and backward sliding structure described in the present embodiment preferably adopts the following structure: an inverted T-shaped guide rail 11 is respectively arranged on the left side and the right side of the top surface of the material rack 1, and at least two first sliding blocks 21 which are movably arranged in the inverted T-shaped guide rails 11 are respectively arranged on the left side and the right side of the bottom surface of the movable rack 2. Fixed mounting has the fixing base 12 of threaded through-hole at work or material rest 1 rear end middle part, and lead screw 13 locates the threaded through-hole on the fixing base 12 soon, and the front end fixed connection of lead screw 13 is in the rear end middle part of removal frame 2. If the screw 13 is rotated in a certain direction to drive the moving frame 2 to move backward along the inverted T-shaped guide rail 11, the screw 13 is rotated in the opposite direction to drive the moving frame 2 to move forward along the inverted T-shaped guide rail 11.

As shown in fig. 1, 2 and 5, the left-right slip structure in the present embodiment preferably adopts the following structure: the front and rear sides of the bottom surface of the moving plate 3 are respectively provided with a linear guide rail 32, a guide rail 322 on each linear guide rail 32 is fixed on the top of the moving frame 2, each linear guide rail 32 is provided with at least two second sliding blocks 321, and each second sliding block 321 on each linear guide rail 32 is fixed on the bottom of the right moving plate 3. A horizontally placed driving oil cylinder 31 is fixedly arranged in the middle of the right end of the movable frame 2, and an extension bar 311 of the driving oil cylinder 31 extends leftwards and is fixedly connected to the middle of the right end of the movable plate 3. When the driving oil cylinder 31 works, the moving plate 3 is pushed to move leftwards when the extension rod of the driving oil cylinder 31 extends leftwards, and the moving plate 3 is pulled to move rightwards when the extension rod of the driving oil cylinder 31 retracts rightwards.

As shown in fig. 1 and fig. 2, the lifting structure in the present solution preferably adopts the following structure: the lift cylinder 41 is fixedly installed at the center of the top surface of the moving plate 3, and an extension rod 411 of the lift cylinder 41 passes through a corresponding through hole on the moving plate 3, extends downwards and is fixedly connected to the center of the top surface of the installation platform 4. The installation platform 4 is driven to move downwards in the process that the extension rod 411 of the lift cylinder 41 extends downwards, and the installation platform 4 is driven to move upwards in the process that the extension rod 411 of the lift cylinder 41 retracts upwards. A guide structure for guiding the mounting platform 4 to ascend or descend smoothly is further provided between the moving plate 3 and the mounting platform 4.

The guiding structure also has various structural forms, and the scheme is provided with a guiding structure respectively at the front side and the rear side of the lifting cylinder 41, as shown in fig. 4 and 5, each guiding structure comprises: the bottom ends of the guide rods 8 respectively penetrate through corresponding guide holes in the moving plate 3, extend downwards and are fixedly connected to the top of the mounting platform 4, the top ends of the guide rods 8 are fixedly connected to the bottom of the upper connecting plate 81, and the axis of each guide rod 8 is parallel to the axis of the extension rod 411 of the lifting oil cylinder 41. In addition, in order to reduce the abrasion of the guide holes, a sliding sleeve 82 can be sleeved in each guide hole, and each guide rod 81 is movably inserted into the corresponding sliding sleeve 82.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any modifications or equivalent changes made in accordance with the technical spirit of the present invention are also within the scope of the present invention.

Claims

1. Draw quick-witted claw material mechanism of pipe includes: work or material rest, its characterized in that: the pipe clamping assembly is arranged on the material rack through the combined displacement structure, and can move forwards or backwards or leftwards or rightwards or upwards or downwards relative to the material rack through the combined displacement structure; the pipe clamping assembly comprises: the mounting platform is provided with at least two groups of claw material structures at intervals from front to back; every group claw material structure includes: the clamping device comprises a mounting seat with a mounting cavity at the bottom, a pair of clamping jaws and a plurality of semi-cylindrical clamping components, wherein the outer contour of each pair of clamping components is correspondingly matched with the inner contour of a clamping port of the corresponding clamping jaw, the bore diameters of the inner cavities of each pair of clamping components are different, and a detachable connecting structure for fixing the pair of clamping components in the clamping ports of the corresponding clamping jaws is arranged between each pair of clamping components and the corresponding clamping jaws; the mounting base is fixedly mounted at the bottom of the mounting platform, the pair of clamping jaws is movably mounted in a mounting cavity of the mounting base through a sliding structure, and a driving structure for driving the two clamping jaws to move oppositely through the sliding structure to clamp the pipe blank or to deviate from the sliding structure to loosen the pipe blank is arranged between the mounting platform and the mounting cavity.

2. The pipe reducing machine claw material mechanism according to claim 1, characterized in that: the pair of clamping jaws consists of a left clamping jaw and a right clamping jaw; the driving structure is as follows: the pipe clamping oil cylinder is fixedly arranged at the top of the mounting platform, an extension rod of the pipe clamping oil cylinder penetrates through a corresponding through hole in the mounting platform and then extends downwards, a connecting seat is fixedly arranged at the bottom of the extension rod of the pipe clamping oil cylinder, a front connecting rod is arranged at the front end of the bottom of the connecting seat, and a rear connecting rod is arranged at the rear end of the bottom of the connecting seat; one end of a first front hinged rod is hinged to a hinged seat at the front end of the top of the left clamping jaw, the other end of the first front hinged rod is hinged to the bottom of the front connecting rod, one end of a second front hinged rod is hinged to a hinged seat at the front end of the top of the right clamping jaw, and the other end of the second front hinged rod is hinged to the hinged position of the front connecting rod and the first front hinged rod; one end of the first rear portion hinge rod is hinged to the hinge seat at the rear end of the top of the left clamping jaw, the other end of the first rear portion hinge rod is hinged to the bottom of the rear portion connecting rod, one end of the second rear portion hinge rod is hinged to the hinge seat at the rear end of the top of the right clamping jaw, and the other end of the second rear portion hinge rod is hinged to the hinge position of the rear portion connecting rod and the first rear portion hinge rod.

3. The pipe reducing machine claw mechanism according to claim 1 or 2, characterized in that: the sliding structure is as follows: a first sliding groove with a long edge placed in the left-right direction is formed inwards on the front side wall of the mounting cavity, a second sliding groove with a long edge placed in the left-right direction is formed inwards on the rear side wall of the mounting cavity, first long-strip sliding blocks protruding outwards and capable of movably extending into the first sliding grooves are arranged on the front side walls of the two clamping jaws, and second long-strip sliding blocks protruding outwards and capable of movably extending into the second sliding grooves are arranged on the rear side walls of the two clamping jaws; when the two clamping jaws move towards or away from each other under the driving of the driving structure, the first long-strip sliding block slides along the first sliding groove, and the second long-strip sliding block slides along the second sliding groove.

4. The pipe reducing machine claw mechanism according to claim 1 or 2, characterized in that: the movable frame is arranged at the top of the material frame through a front-back sliding structure and can move forwards or backwards relative to the material frame through the front-back sliding structure; the movable plate is arranged at the top of the movable frame through a left-right sliding structure and can move leftwards or rightwards relative to the movable frame through the left-right sliding structure; the lifting structure is arranged between the moving plate and the mounting platform, and the mounting platform can move upwards or downwards relative to the moving plate through the lifting structure.

5. The pipe reducing machine claw material mechanism according to claim 4, characterized in that: the front and back sliding structure is as follows: the left side and the right side of the top surface of the material rack are respectively provided with an inverted T-shaped guide rail, and the left side and the right side of the bottom surface of the movable rack are respectively provided with at least two first sliding blocks which are movably arranged in the inverted T-shaped guide rails; the middle part of the rear end of the material rack is fixedly provided with a fixed seat with a threaded through hole, the screw rod is arranged in the threaded through hole in a rotating mode, and the front end of the screw rod is fixedly connected to the middle part of the rear end of the movable rack.

6. The pipe reducing machine claw mechanism according to claim 4, characterized in that: the left-right sliding structure comprises: the front side and the rear side of the bottom surface of the moving plate are respectively provided with a linear guide rail, the guide rail on each linear guide rail is fixed at the top of the moving frame, each linear guide rail is provided with at least two second sliding blocks, and each second sliding block on each linear guide rail is fixed at the bottom of the right moving plate; a horizontally placed driving oil cylinder is fixedly arranged in the middle of the right end of the moving frame, and an extension rod of the driving oil cylinder extends leftwards and then is fixedly connected to the middle of the right end of the moving plate.

7. The pipe reducing machine claw material mechanism according to claim 4, characterized in that: the lifting structure is as follows: the lifting oil cylinder is fixedly arranged in the center of the top surface of the moving plate, and an extension rod of the lifting oil cylinder penetrates through a corresponding through hole in the moving plate, extends downwards and is fixedly connected to the center of the top surface of the mounting platform; the mounting platform is driven to move downwards in the process that the extension rod of the lifting oil cylinder extends downwards, and the mounting platform is driven to move upwards in the process that the extension rod of the lifting oil cylinder retracts upwards; a guide structure for guiding the mounting platform to ascend or descend is further arranged between the moving plate and the mounting platform.

8. The pipe reducing machine claw mechanism according to claim 7, characterized in that: be provided with a guide structure respectively at the front side and the rear side that are located lift cylinder, every guide structure includes: the bottom ends of the guide rods respectively penetrate through corresponding guide holes in the moving plate, extend downwards and are fixedly connected to the top of the mounting platform, the top ends of the guide rods are fixedly connected to the bottom of the upper connecting plate, and the axis of each guide rod is parallel to the axis of an extension rod of the lifting oil cylinder.

9. The pipe reducing machine claw mechanism according to claim 8, characterized in that: a sliding sleeve is sleeved in each guide hole, and each guide rod is movably inserted in the corresponding sliding sleeve.