CN213998619U - Clamping system for metal plastic composite pipe compounding process - Google Patents

Abstract

The utility model provides a clamping system for compound technology of metal plastic composite pipe, comprises a workbench, two interval arrangement clamping structures on the workstation, the clamping structure includes clamping base chuck support, chuck lifting adjusting device, chuck and hydraulic means, hydraulic means connects and drives the chuck and remove at the horizontal direction, chuck lifting adjusting device connects and drives the chuck and remove on the perpendicular to horizontal direction, install on the workstation clamping base slidable, be equipped with flexible bloated circle on the chuck, the contact compresses tightly plastic tubing inner wall round behind the bloated circle pressurized, be equipped with the bloated circle gas tube that provides atmospheric pressure for the bloated circle on the chuck, still be equipped with on one of them chuck and provide the pipeline gas tube of atmospheric pressure for the plastic tubing inside. The utility model discloses can the centre gripping and seal the plastic tubing both ends and can exert pressure toward the plastic tubing inside, the clamping structure can move so that the central line of chuck and the central line coincidence of the tubular product of treating processing in three-dimensional space, and the chuck is removable.

Description

Clamping system for metal plastic composite pipe compounding process

Technical Field

The utility model relates to a compound technology field of metal plastic composite pipe specifically is a clamping system for compound technology of metal plastic composite pipe.

Background

The metal plastic composite pipe is a pipe which is formed by compounding an outer layer serving as a metal pipe and an inner layer serving as a plastic pipe through a certain process, and has the advantages of the metal pipe and a non-metal pipe. When the metal pipe and the plastic pipe are combined and bonded, the plastic pipe needs to be heated and melted so as to bond the plastic pipe and the inner wall of the metal pipe. However, the plastic tube is first placed inside the metal tube, and then pressure is applied to expand and adhere to the inner wall of the metal tube, and after the adhesion is closed, the plastic tube is heated and melted to adhere to the inner wall of the metal tube.

SUMMERY OF THE UTILITY MODEL

The above-mentioned problem to prior art exists, the utility model aims at providing a clamping system for compound technology of metal plastic composite pipe, can the centre gripping and seal the plastic tubing both ends and can apply pressure toward the plastic tubing inside, make the plastic tubing inflation laminating metal pipe inner wall in the metal tubing, do benefit to going on of follow-up compound technology, the clamping structure can move so that the central line of chuck and the central line coincidence of the tubular product of treating processing in three-dimensional space, the centre gripping action of being convenient for is suitable for compound technology production line of metal plastic composite pipe, has improved the machining efficiency and the recombination performance of compound technology, and the chuck is removable to the tubular product processing of treating processing of being suitable for different pipe diameters.

In order to realize the purpose, the utility model discloses the technical scheme who adopts is:

a clamping system for a metal plastic composite pipe compounding process comprises a workbench, two clamping structures arranged on the workbench at intervals and a steel cable connecting the two clamping structures, wherein each clamping structure comprises a clamping base and a chuck support arranged on the clamping base, chuck lift adjusting device, chuck and hydraulic means, hydraulic means installs on the chuck support, hydraulic means connects and drives the chuck and remove at the horizontal direction, chuck lift adjusting device connects and drives hydraulic means and chuck and move on the perpendicular to horizontal direction, install on the workstation clamping base slidable, two chucks of two clamping structures are arranged in opposite directions, be equipped with flexible expand ring on the chuck, contact and compress tightly plastic tubing inner wall round after the expand ring pressurized, be equipped with the expand ring trachea of aerifing that provides atmospheric pressure for the expand ring on the chuck, still be equipped with the pipeline trachea of aerifing that provides atmospheric pressure for the plastic tubing inside on one of them chuck.

As a further improvement of the above technical solution:

preferably, the workbench comprises a linear rail, the clamping base is slidably disposed on the rail along the rail, the hydraulic device is connected with and drives the chuck to move in a direction parallel to the rail, the chuck support is slidably mounted on the clamping base, and the sliding direction of the chuck support is perpendicular to the rail.

Preferably, the clamping base is provided with a slide rail perpendicular to the rail, the chuck support slides along the slide rail, the clamping base is further provided with two limiting plates perpendicular to the clamping base, the two limiting plates are located at two ends of the slide rail respectively, the chuck support is located between the two limiting plates, each limiting plate is provided with a plurality of bolts, and the bolts vertically penetrate through the limiting plates and then contact and compress the chuck support.

Preferably, the chuck lifting adjusting device is a screw rod structure.

Preferably, the expansion ring is a first expansion ring, the chuck comprises a support shaft, a fixture die head support, the first expansion ring, an annular inner die head and an annular outer die head, one end of the support shaft is connected with the hydraulic device, the other end of the support shaft is provided with the fixture die head support, the inner die head and the outer die head are arranged on the fixture die head support in a concentric line mode, the inner diameter of the outer die head is larger than the outer diameter of the inner die head, a gap for inserting a pipe end of a plastic pipe to be processed is formed between the inner surface of the outer die head and the outer surface of the inner die head, a groove for accommodating the first expansion ring is formed in the outer surface of the inner die head, the groove is communicated with the gap, the first expansion ring is made of rubber, the inner portion can be inflated, and the first expansion ring is communicated with an external inflation device.

More preferably, the groove is arranged in a circle along the circumferential direction of the inner die head, the width of the opening end of the groove is smaller than that of the bottom end of the groove, and the first expansion ring is annular.

The inner surface of the inner die head is provided with an inflation groove, and two ends of the inflation groove are respectively communicated with the groove and the inner ring space of the inner die head.

Preferably, the expansion ring is a second expansion ring, the chuck comprises an assembly shaft, a cylindrical shell arranged on the assembly shaft and a cylindrical inner barrel which is arranged in the shell and shares the center line, the assembly shaft is connected with the hydraulic device, a second gap for inserting a pipe end of a plastic pipe to be processed exists between the inner side surface of the shell and the outer side surface of the inner barrel, the side surface of the inner barrel comprises a rear chuck and a flexible second expansion ring which are connected along the direction of the center line of the inner barrel, and one side, far away from the second gap, of the second expansion ring is communicated with an external air supply system.

More preferably, the assembly shaft is internally provided with an axial hole along the length direction of the assembly shaft and a radial hole vertically communicated with the axial hole, the axial hole is a through hole penetrating through two ends of the assembly shaft, the radial hole is positioned at one end of the assembly shaft, one end of the radial hole is positioned in the inner cylinder, one end of the radial hole is communicated with the axial hole, and the other end of the radial hole is communicated with one side, far away from the second gap, of the second expansion ring.

More preferably, the chuck further comprises an inflation screw and an inflation tube, the inflation screw is provided with a through hole penetrating through two ends of the inflation screw, an inner thread is arranged on the inner wall of one end, close to the radial hole, of the assembly shaft, an outer thread matched with the inner thread is arranged on the inflation screw, the inflation screw is connected with the assembly shaft, one end, located in the axial hole, of the inflation screw is not larger than the radial hole, the diameter of the inflation tube is equal to the aperture of the through hole of the inflation screw, and the inflation tube penetrates through the through hole and the axial.

The utility model has the advantages that: the clamping structure can move in a three-dimensional space so that the central line of the chuck coincides with the central line of the pipe to be processed, so that the clamping structure is convenient to clamp and move, is suitable for a metal-plastic composite pipe composite process production line, improves the processing efficiency and the composite performance of a composite process, and is replaceable for the chuck so as to be suitable for processing the pipes to be processed with different pipe diameters.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic view of a chuck structure according to a first embodiment of the present invention;

fig. 3 is another schematic cross-sectional view of a chuck according to a first embodiment of the present invention;

fig. 4 is a schematic view of a chuck structure according to a second embodiment of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

A clamping system for a metal plastic composite pipe compounding process is shown in figure 1 and comprises a workbench 1, two clamping structures arranged on the workbench 1 at intervals and a steel cable 3 which is used for connecting the two clamping structures and has a fastening effect.

The table 1 comprises a linear rail.

The clamping structure comprises a clamping base 21, a chuck bracket 22 arranged on the clamping base 21, a chuck lifting adjusting device 23, a chuck 24 and a hydraulic device 25. The clamping base 21 is slidably disposed on the rail along the rail.

The hydraulic device 25 is installed on the chuck support 22, the hydraulic device 25 is connected with and drives the chuck 24 to move in the horizontal direction, the chuck lifting adjusting device 23 is connected with and drives the hydraulic device 25 and the chuck 24 to move in the direction perpendicular to the horizontal direction, and the two chucks 24 of the two clamping structures are arranged oppositely.

The hydraulic device 25 is connected with and drives the chuck 24 to move in a direction parallel to the track, the chuck support 22 is slidably mounted on the clamping base 21, and the sliding direction of the chuck support 22 is perpendicular to the track. Specifically, be equipped with the slide rail on the clamping base 21, the slide rail perpendicular to track, chuck support 22 slides along the slide rail, still is equipped with two limiting plates perpendicular to clamping base 21 on the clamping base 21, and two limiting plates are located the both ends of slide rail respectively, and chuck support 22 is located between two limiting plates, is equipped with a plurality of bolts on every limiting plate, and the bolt passes limiting plate back contact and compresses tightly chuck support 22 perpendicularly. The position of the collet holder 22 in the direction perpendicular to the rail can be adjusted by means of the adjusting screw. In the direction perpendicular to the rail, the chuck support 22 only needs to be finely adjusted to align the chuck 24 with the machining position more precisely, so that the position adjustment requirement can be met through bolt adjustment, and the adjustment mode is simple and accurate.

The chuck lifting adjusting device 23 is a screw structure. Specifically, the chuck elevation adjusting device 23 drives the hydraulic device 25 to ascend or descend, and in order to enable the hydraulic device 25 to ascend or descend stably, a guide rod is arranged on the chuck support 22, and the hydraulic device 25 moves along the guide rod.

The pipe to be processed comprises a metal pipe and a plastic pipe, the plastic pipe is sleeved in the metal pipe, namely the plastic pipe is lining plastic, two ends of the plastic pipe respectively extend out of two ends (not shown in the figure) of the metal pipe so as to be convenient for clamping by the clamping assembly, and the plastic pipe and the metal pipe are not bonded.

Based on the above structure, the chuck 24 can be positionally adjusted in three-dimensional space. The pipe to be processed is located between the two jaws 24, the two jaws 24 sealing both ends of the plastic pipe and applying pressure to the interior of the plastic pipe. It should be noted that when the same batch of pipes are processed, the chuck lifting adjusting device 23 and the chuck support 22 are adjusted once before processing, so that the center line of the chuck 24 coincides with the center line of the pipe, and when each pipe is processed, the hydraulic device 25 is started to drive the chuck 24 to contact or separate from the metal plastic composite pipe. In addition, the hydraulic device 25 is detachably connected with the chuck 24, and when pipes with different pipe diameters are processed, only the chuck 24 needs to be replaced.

The clamping heads 24 are provided with flexible expansion rings which are pressed to contact and tightly press the inner wall of the plastic pipe for one circle, the clamping heads 24 are provided with expansion ring inflation air pipes 26 for providing air pressure for the expansion rings, and one clamping head 24 is further provided with a pipeline inflation air pipe 27 for providing air pressure for the inside of the plastic pipe.

The collet 24 can take a variety of embodiments, two examples are now provided for illustration.

Example one

As shown in fig. 2 and 3, chuck 24 includes a clamp die holder 241, a support shaft 242, an inner die 244, an outer die 245, a first expander, an expander inflation tube 26, and a tube inflation tube 27.

One end of the supporting shaft 242 is connected with the hydraulic device 25, the other end is provided with the clamp die head support 241, and the central lines of the supporting shaft 242 and the clamp die head support 241 are overlapped. At least one end surface of the jig die holder 241 is perpendicular to the support shaft 242 and serves as a mounting surface. The support shaft 242 may be provided with a through hole 243 communicating both ends thereof. One end of the pipeline inflation air pipe 27 is communicated with the through hole 243, and the other end is communicated with an external inflation device.

The inner die 244 and the outer die 245 are both annular, the inner die 244 and the outer die 245 are mounted on the fixture die holder 241 in a manner of being concentric, and the center line of the inner die 244 or the outer die 245 coincides with the support shaft 242. Specifically, one end face of the inner die 244 is mounted on the mounting surface of the jig die holder 241, and the other end face thereof overhangs, and one end face of the outer die 245 is mounted on the mounting surface of the jig die holder 241, and the other end face thereof overhangs. The inner diameter of the outer die 245 is larger than the outer diameter of the inner die 244, i.e. there is a first gap c between the outer die 245 and the inner die 244, in particular there is an annular first gap c between the inner surface of the outer die 245 and the outer surface of the inner die 244, the purpose of the first gap c being to insert a pipe end of a plastic pipe to be processed. It is easily understood that the inner surface of the outer die 245 refers to the circumferential side of the inner ring of the outer die 245, and the outer surface of the outer die 245 refers to the circumferential side of the outer ring of the outer die 245. The associated definition of the inner die 244 is the same.

The outer surface of the inner die 244 is provided with a groove 247 for accommodating the first expander, and the groove 247 is communicated with the first gap c. The grooves 247 are arranged in one turn along the circumferential direction of the inner die 244, and the width of the open ends of the grooves 247 is smaller than the width of the bottom ends of the grooves 247. Preferably, the cross-section of the recess 247 is trapezoidal.

As can be seen from the above, the length direction of the first gap c is perpendicular to the mounting surface of the die holder 1, the length of the first gap c is equal to the thickness of the inner die 244 or the outer die 245, and the width of the first gap c is not less than the thickness of the plastic pipe so as to allow the plastic pipe to be inserted. In order to facilitate the quick insertion of the plastic pipe into the first gap c, the end of the first gap c remote from the mounting surface of the die holder 1 has a funnel-shaped cross section, in other words, the width of the first gap c gradually increases toward the direction remote from the mounting surface of the die holder 1 at the end remote from the mounting surface of the die holder 1. That is, the first gap c includes two portions that are connected, and the width of one portion is the same at each place, and the width of the other portion is different at each place.

The first expansion ring is made of rubber materials, is annular, can be internally inflated, is similar to a tire, and is communicated with an external inflation device.

An inflation groove 248 is arranged on the inner surface of the inner die head 244, and two ends of the inflation groove 248 are respectively communicated with the groove 247 and the inner ring space of the inner die head 244. The expansion ring inflation pipe 26 passes through the inflation groove 248, and two ends of the expansion ring inflation pipe 26 are respectively communicated with the first expansion ring and an external inflation device to inflate or deflate the first expansion ring.

The inner die 244 includes a first inner die 2441 and a second inner die 2442 which are annular and connected to each other, and the grooves 247 are symmetrically arranged with respect to the connecting surfaces of the first inner die 2441 and the second inner die 2442. Two end faces of the first inner die 2441 are respectively connected with the mounting face of the die holder 1 and one end face of the second inner die 2442, and the other end face of the second inner die 2442 is suspended. The mounting face of the die holder 1, the first inner die 2441, and the second inner die 2442 are positioned by a plurality of pins 249a, and connected by a plurality of screws 249 b. The pin 249a sequentially passes through the mounting surface of the die head bracket 1 and the first inner die 2441 and then enters the second inner die 2442, a part of the screw 249b passes through the second inner die 2442 and then enters the first inner die 2441, and a part of the screw 249b passes through the mounting surface of the die head bracket 1 and then enters the first inner die 2441. The plurality of screws 249b passing through the second inner die 2442 are arranged in an annular array, and the plurality of screws 249b passing through the mounting face of the die holder 1 are arranged in an annular array.

The outer die 245 includes a first outer die 2451 and a second outer die 2452 which are annular and connected to each other. The connecting surfaces of the first outer die 2451 and the second outer die 2452 coincide with the connecting surfaces of the first inner die 2441 and the second inner die 2442. Two end faces of the first outer die 2451 are respectively connected with the mounting face of the die bracket 1 and one end face of the second outer die 2452, and the other end face of the second outer die 2452 is suspended. The mounting face of the die holder 1, the first outer die 2451 and the second outer die 2452 are also positioned by a plurality of pins 249a and connected by a plurality of screws 249 b. The pin 249a sequentially passes through the mounting surface of the die holder 1 and the first outer die 2451 and then enters the second outer die 2452, and the screw 249b sequentially passes through the mounting surface of the die holder 1 and the first outer die 2451 and then enters the second outer die 2452.

The end of the second inner die 2442, which is far away from the mounting surface of the die holder 1, is provided with a chamfer, the end of the second outer die 2452, which is far away from the mounting surface of the die holder 1, is provided with a chamfer, and the chamfer of the second inner die 2442 and the chamfer of the second outer die 2452 form a funnel end of the first gap c.

The working process of the embodiment is as follows: the pipe to be processed is positioned between the two clamping heads 24, the inflation in the first expansion ring is released, the first expansion ring is in a non-expansion or shriveling state, the hydraulic device 25 is started, the two clamping heads 24 move oppositely to be respectively contacted with the two ends of the plastic pipe, the pipe end of the plastic pipe is inserted into the first gap c, then the first expansion ring is inflated through an external inflation device, the first expansion ring expands and compresses the inner wall of the pipe end of the plastic pipe inserted into the first gap c, and the sealing of the pipe end of the plastic pipe is realized by combining the installation surface of the die head support 1, the supporting shaft 242 and other structures of the clamp. When the plastic pipe needs to be inflated, the external air supply device can be communicated with the inside of the plastic pipe through the through hole 243 in the supporting shaft 242, the inflated air cannot leak through other parts of the end face of the plastic pipe, and when the plastic pipe needs to be completely sealed, the through hole 243 is only needed to be sealed. When the processing is finished and the metal plastic composite pipe needs to be taken down, the first expansion ring is deflated to ensure that the first expansion ring is deflated and collapsed or shriveled, then the hydraulic device 25 is started, the hydraulic device 25 drives the chuck 24 to be separated from the plastic pipe, the metal plastic composite pipe is taken out, and the metal plastic composite pipe is reinserted into the next pipe to be processed.

Example two

As shown in fig. 4, the clamp 24 includes a housing 241 ', an inner cylinder, an outer end cap 246 ', a limiting cylinder 249 ', an assembling shaft 243 ', an inflation screw 244 ', a bolt 245 ' and an inflation tube 247 '.

The housing 241 'and the inner cylinder are both cylindrical, the inner cylinder is positioned in the housing 241' along the same center line, and a second gap 248 'for inserting the pipe end of the plastic pipe to be processed is arranged between the inner side surface of the housing 241' and the outer side surface of the inner cylinder. One end of the housing 241 'is connected to the outer end cap 246' and the other end is open.

The inner cylinder comprises two end faces and a side face connected with the two end faces. The two end surfaces of the inner barrel are front cartridge 2421 'and inner end cap 2424', respectively, front cartridge 2421 'being closer to the open end of housing 241' than inner end cap 2424 ', or inner end cap 2424' being closer to outer end cap 246 'than front cartridge 2421'. The side surface of the inner cylinder includes a rear collet 2422 'and a flexible second expansion ring 2423' connected along the centerline direction thereof, and a front collet 2421 ', a second expansion ring 2423', a rear collet 2422 'and an inner end cap 2424' are sequentially connected. The second expansion ring 2423' is arranged in a circle along the circumferential direction of the inner cylinder. The side of the second expander 2423 'distal the second gap 248', or the inside of the expander, is in communication with an external air supply.

The front chuck 2421 ' comprises an end plate and a hooked front limiting hook which are integrally connected, the end plate is a circular plate covering one end face of the inner barrel, the front limiting hook is vertically connected with the circumference of the end plate, one end of the rear chuck 2422 ' is connected with the inner end cover 2424 ' through a bolt 245 ', the other end of the rear chuck 2422 ' is provided with a hooked rear limiting hook, and the front limiting hook and the rear limiting hook are oppositely arranged at intervals.

The limiting cylinder 249' is cylindrical. The outer diameter of the limiting cylinder 249 'is smaller than the inner diameter of the inner cylinder, and the limiting cylinder 249' is located inside the inner cylinder. One end surface of limiting cylinder 249 ' contacts front chuck 2421 ' and the other end surface contacts inner end cap 2424 '. A through hole in the radial direction is formed in the limiting cylinder 249 ', and the through hole in the limiting cylinder 249' is located between the front limiting hook and the rear limiting hook.

One end of the second expansion ring 2423 'is positioned between the front limit hook and the limit cylinder 249', the middle part of the second expansion ring covers the through hole on the limit cylinder 249 ', and the other end of the second expansion ring is positioned between the rear limit hook and the limit cylinder 249'. That is, one end of the through hole on the limiting cylinder 249 ' is communicated with the internal cavity of the limiting cylinder 249 ', and the other end is one side or the inner surface side of the second expansion ring 2423 '.

Based on above-mentioned structure, preceding limit hook plays limiting displacement with back limit hook. In order to better realize the limiting function, the front limiting hook and the rear limiting hook are both provided with inward flanges, in other words, the cross sections of the front limiting hook and the rear limiting hook are both L-shaped. Correspondingly, two ends of the second expansion ring 2423 'are provided with outward flanges, and the flanges at the two ends of the second expansion ring 2423' can be respectively hooked with the flanges of the front limiting hook and the flanges of the rear limiting hook, so that limiting is realized. When the inner side of the second expansion ring 2423 ' is pressed, the second expansion ring 2423 ' is extruded or expanded outwards, and meanwhile, due to the limiting effect of the front limiting hook and the rear limiting hook, two ends of the second expansion ring 2423 ' cannot be separated from the front limiting hook and the rear limiting hook.

The fitting shaft 243 ' is located on the center line of the outer casing 241 ' or the inner cylinder, and the fitting shaft 243 ' is connected to the hydraulic device 25. Specifically, one end of the assembling shaft 243 ' passes through the outer end cap 246 ' and the inner end cap 2424 ' in sequence and then enters the inner cavity of the limiting cylinder 249 ', and the other end of the assembling shaft 243 ' can be connected with an external air supply device and an inflation device. The assembling shaft 243 'has an axial hole 2431' along the length direction and a radial hole 2432 'vertically communicated with the axial hole 2431', the axial hole 2431 'is a through hole penetrating through both ends of the assembling shaft 243', the radial hole 2432 'is located at one end of the assembling shaft 243', one end where the radial hole 2432 'is located inside the inner cylinder, and one end of the radial hole 2432' is communicated with the axial hole 2431 ', and the other end is communicated with the inside of the inner cylinder or the limiting cylinder 249'. The radial hole 2432 'and the through hole on the limiting cylinder 249' are positioned on the same straight line.

The inflation screw 244 ' has a through hole penetrating through both ends thereof, an inner wall of one end of the assembly shaft 243 ' close to the radial hole 2432 ' is provided with an internal thread, an external thread matched with the internal thread is arranged on the inflation screw 244 ', the inflation screw 244 ' passes through the front chuck 2421 ' and is in threaded connection with the assembly shaft 243 ', both ends of the through hole of the inflation screw 244 ' are respectively communicated with the axial hole 2431 ' and the open end of the shell 241 ', and one end of the inflation screw 244 ' positioned in the axial hole 2431 ' does not exceed the radial hole 2432 ' so as not to block the communication between the radial hole 2432 ' and the axial hole 2431 '.

The diameter of the gas-filled tube 247 ' is equal to the diameter of the through hole of the gas-filled screw 244 ', and the gas-filled tube 247 ' passes through the through hole of the gas-filled screw 244 ' and the axial hole 2431 '.

Based on the above structure, the gas filling tube 247 ' divides the axial hole 2431 ' into two spaces, which are the portion of the axial hole 2431 ' outside the gas filling tube 247 ' and the space inside the gas filling tube 247 '. An axial hole 2431 ', a radial hole 2432', an inner cavity of the limiting cylinder 249 ', a through hole of the limiting cylinder 249' and the inner side surface of the second expansion ring 2423 'on the outer part of the inflation tube 247' are communicated; the interior of the gas-filled tube 247 'communicates with the open end of the housing 241'.

The working process of the embodiment is as follows: the pipe to be processed is positioned between the two chucks 24, the pressure of the second expansion ring 2423 ' is released, the second expansion ring 2423 ' is in a non-expansion or shriveling state, the hydraulic device 25 is started, the two chucks 24 move oppositely to respectively contact the two ends of the plastic pipe, the pipe ends of the plastic pipe are inserted into the gap, the axial hole 2431 ' outside the inflation pipe 247 ' is communicated with an external air supply device, and the interior of the inflation pipe 247 ' is communicated with the inflation device. And then, opening an external gas supply device, enabling gas of the gas supply device to sequentially pass through an axial hole 2431 ', a radial hole 2432 ', an inner cavity of a limiting cylinder 249 ' and a through hole of the limiting cylinder 249 ' on the outside of the inflation tube 247 ' to enter the inner side of the second expansion ring 2423 ', expanding the flexible second expansion ring 2423 ' under the action of air pressure and pressing the inner wall of the tube end inserted into the second gap 248 ', and realizing sealing of the tube end of the plastic tube by combining other structures of the clamp such as the front clamping head 2421 '. When the plastic pipe needs to be inflated, the inflation device is started, the inflated gas enters the interior of the plastic pipe through the inflation pipe 247 'and cannot leak through other parts of the end face of the plastic pipe, and when the plastic pipe needs to be completely sealed, the inflation pipe 247' only needs to be sealed. When the metal plastic composite pipe needs to be taken down after the processing is finished, the action of the air supply device is stopped, the second expansion ring 2423' loses the action of air pressure and collapses, the sealing effect on the plastic pipe is further lost, the hydraulic device 25 is started, the hydraulic device 25 drives the chuck 24 to be separated from the plastic pipe, the metal plastic composite pipe is taken out, and the metal plastic composite pipe is inserted into the next pipe to be processed again.

Finally, it must be said here that: the above embodiments are only used for further detailed description of the technical solutions of the present invention, and should not be understood as limiting the scope of the present invention, and the modifications and adjustments made by those skilled in the art according to the above-mentioned contents of the present invention are all included in the scope of the present invention.

Claims (10)

1. A clamping system for a metal plastic composite pipe compounding process is characterized in that: the device comprises a workbench (1), two clamping structures arranged on the workbench (1) at intervals and a steel cable (3) connected with the two clamping structures, wherein each clamping structure comprises a clamping base (21), a chuck support (22) arranged on the clamping base (21), a chuck lifting adjusting device (23), a chuck (24) and a hydraulic device (25), the hydraulic device (25) is arranged on the chuck support (22), the hydraulic device (25) is connected with and drives the chuck (24) to move in the horizontal direction, the chuck lifting adjusting device (23) is connected with and drives the hydraulic device (25) and the chuck (24) to move in the direction perpendicular to the horizontal direction, the clamping base (21) is slidably arranged on the workbench (1), the two chucks (24) of the two clamping structures are arranged in opposite directions, a flexible expansion ring is arranged on the chuck (24), the expansion ring contacts and compresses the inner wall of a plastic pipe for a circle after being pressed, the clamping heads (24) are provided with expanding ring inflation air pipes (26) for providing air pressure for the expanding rings, and one clamping head (24) is also provided with a pipeline inflation air pipe (27) for providing air pressure for the interior of the plastic pipe.

2. The clamping system of claim 1, wherein: the workbench (1) comprises a linear rail, a clamping base (21) can be arranged on the rail in a sliding mode along the rail, a hydraulic device (25) is connected with and drives a chuck (24) to move in a direction parallel to the rail, a chuck support (22) is installed on the clamping base (21) in a sliding mode, and the sliding direction of the chuck support (22) is perpendicular to the rail.

3. The clamping system of claim 2, wherein: be equipped with the slide rail on clamping base (21), the slide rail perpendicular to track, chuck support (22) slide along the slide rail, still are equipped with the limiting plate of two perpendicular to clamping base (21) on clamping base (21), and two limiting plates are located the both ends of slide rail respectively, and chuck support (22) are located between two limiting plates, are equipped with a plurality of bolts on every limiting plate, and the bolt passes limiting plate back contact perpendicularly and compresses tightly chuck support (22).

4. The clamping system of claim 1, wherein: the chuck lifting adjusting device (23) is of a screw rod structure.

5. The clamping system according to any one of claims 2 to 4, wherein: the expansion ring is a first expansion ring, the chuck (24) comprises a support shaft (242), a clamp die head support (241), the first expansion ring, an annular inner die head (244) and an annular outer die head (245), one end of the support shaft (242) is connected with a hydraulic device (25), the other end of the support shaft is provided with the clamp die head support (241), the inner die head (244) and the outer die head (245) are arranged on the clamp die head support (241) in a concentric line mode, the inner diameter of the outer die head (245) is larger than the outer diameter of the inner die head (244), a gap (6) for inserting a pipe end of a plastic pipe to be processed is formed between the inner surface of the outer die head (245) and the outer surface of the inner die head (244), a groove (247) for accommodating the first expansion ring is formed in the outer surface of the inner die head (244), the groove (247) is communicated with the gap (6), the first expansion ring is made of rubber, the interior of the first expansion ring can be inflated, and the first expansion ring is communicated with an external inflation device.

6. The clamping system of claim 5, wherein: the groove (247) is arranged in a circle along the circumferential direction of the inner die head (244), the width of the opening end of the groove (247) is smaller than that of the bottom end of the groove (247), and the first expansion ring is annular.

7. The clamping system of claim 5, wherein: an inflation groove (248) is arranged on the inner surface of the inner die head (244), and two ends of the inflation groove (248) are respectively communicated with the groove (247) and the inner ring space of the inner die head (244).

8. The clamping system according to any one of claims 2 to 4, wherein: the expansion ring is a second expansion ring (2423 '), the chuck (24) comprises a mounting shaft (243') and a cylindrical shell (241 ') mounted on the mounting shaft (243'), and a cylindrical inner cylinder which is positioned in the shell (241 ') and shares the same center line, the mounting shaft (243') is connected with the hydraulic device (25), a second gap (248 ') for inserting the pipe end of the plastic pipe to be processed is arranged between the inner side surface of the shell (241') and the outer side surface of the inner cylinder, the side surface of the inner cylinder comprises a rear chuck (2422 ') and a flexible second expansion ring (2423') which are connected along the direction of the center line of the inner cylinder, and the side, far away from the second gap (248 '), of the second expansion ring (2423') is communicated with an external air supply system.

9. The clamping system of claim 8, wherein: the inner part of the assembly shaft (243 ') is provided with an axial hole (2431') along the length direction of the assembly shaft and a radial hole (2432 ') vertically communicated with the axial hole (2431'), the axial hole (2431 ') is a through hole penetrating through two ends of the assembly shaft (243'), the radial hole (2432 ') is positioned at one end of the assembly shaft (243'), one end of the radial hole (2432 ') is positioned in the inner barrel, one end of the radial hole (2432') is communicated with the axial hole (2431 '), and the other end of the radial hole (2432') is communicated with one side, far away from the second gap (248 '), of the second expansion ring (2423').

10. The clamping system of claim 9, wherein: the clamping head (24) further comprises an inflation screw rod (244 ') and an inflation pipe (247'), the inflation screw rod (244 ') is provided with a through hole penetrating through two ends of the inflation screw rod, the inner wall of one end, close to the radial hole (2432'), of the assembling shaft (243 ') is provided with an internal thread, the inflation screw rod (244') is provided with an external thread matched with the internal thread, the inflation screw rod (244 ') is connected with the assembling shaft (243'), one end, located in the axial hole (2431 '), of the inflation screw rod (244') does not exceed the radial hole (2432 '), the pipe diameter of the inflation pipe (247') is equal to the diameter of the through hole of the inflation screw rod (244 '), and the inflation pipe (247') penetrates through the through hole of the inflation screw rod (244 ') and the axial hole (2431').

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