A shearing device for pressure screen processing

Abstract

The present invention relates to the technical field of shearing devices, and specifically to a shearing device for processing a pressure screen, comprising a base plate and a shearing pressure beam which is movably arranged above the base plate, wherein a shearing tool for shearing is arranged on the shearing pressure beam, and the shearing tool is driven to move up and down by the shearing pressure beam to achieve shearing, and the shearing device also comprises: a fixed outer mold and a circular tube inner mold, wherein the fixed outer mold and the circular tube inner mold cooperate with each other to provide internal and external support for a screen drum, thereby preventing the screen drum from deforming during the shearing process; the present invention can quickly shear the screen drum of the pressure screen, realize length control of the screen drum processing, has the advantages of fast processing speed and convenient disassembly of the screen drum, and can prevent the screen drum from deforming during the shearing process.

Description

Technical Field

[0001] The invention relates to the technical field of shearing devices, in particular to a shearing device for processing pressure screens. Background Art

[0002] A pressure screen is a device used to screen and separate particles of different sizes in a suspension. The core component of the pressure screen is the screen drum. The screen drum of the pressure screen is a cylindrical component, usually made of corrosion-resistant materials such as stainless steel, with a large number of evenly distributed screen holes or screen slits on its surface. The size and shape of these screen holes or screen slits are designed according to different screening requirements. In the process of processing the screen drum of the pressure screen, the length of the screen drum needs to be determined first, and then flanges are installed at the upper and lower ends of the screen drum. When determining the length of the screen drum, the prior art often uses grinding wheel cutting or laser cutting. The grinding wheel cutting method has low working efficiency, and the grinding wheel disc needs to rotate around the screen drum for one circle, and a large amount of metal dust is generated, resulting in a harsh processing environment. Laser cutting not only has a high cost, but also produces harmful gases, which endangers the health of workers. Summary of the invention

[0003] The object of the present invention is to provide a shearing device for pressure screen processing to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a shearing device for pressure screen processing, comprising a base plate and a shearing pressure beam which is movable and lifted above the base plate, a shearing tool for shearing is arranged on the shearing pressure beam, and the shearing tool is driven to move up and down by the shearing pressure beam to achieve shearing, and the shearing device also includes: A fixed outer mold and a circular tube inner mold, wherein the fixed outer mold and the circular tube inner mold cooperate with each other to support the screen drum internally and externally, so as to prevent the screen drum from deforming during the shearing process; the circular tube inner mold is in the shape of a circular tube, and a cylindrical cavity is provided in the fixed outer mold. There is a gap between the outer surface of the circular tube inner mold and the inner wall surface of the fixed outer mold, and the screen drum is arranged in the above gap to be supported internally and externally; the circular tube inner mold can move axially relative to the fixed outer mold, and when the circular tube inner mold is pulled out from the fixed outer mold, the screen drum on the circular tube inner mold can be disassembled and assembled at this time, and when the circular tube inner mold is inserted into the fixed outer mold, the end of the circular tube inner mold close to the shearing tool is flush with the surface of the fixed outer mold; The annular airbag is embedded on the outer surface of the inner mold of the circular tube. The annular airbag is inflated to expand the annular airbag, thereby making the annular airbag frictionally contact with the screen drum to lock the screen drum.

[0005] A split movable beam is arranged below the shearing and pressing beam, a track groove is provided on the lower surface of the shearing and pressing beam, a limiting slide rail is fixedly arranged on the upper part of the split movable beam, and the limiting slide rail is slidably limited in the track groove.

[0006] A return spring is arranged between one end of the split movable beam and the shear pressure beam, and an extrusion contact plate is fixedly arranged at the other end of the split movable beam. An oscillation cam is arranged outside the extrusion contact plate. The return spring applies an elastic thrust to the split movable beam, so that the split movable beam has an elastic tendency to move toward the direction of the oscillation cam. A cam motor for driving the oscillation cam to rotate is installed on the shear pressure beam, and a polishing grinding strip is fixedly arranged on the split movable beam.

[0007] A hidden vertical groove is provided on the shearing tool, and the hidden vertical groove corresponds to the position of the polishing and grinding strip. When the shearing tool moves in a direction away from the fixed outer mold, the polishing and grinding strip will protrude outward through the hidden vertical groove and be higher than the side surface of the shearing tool facing the fixed outer mold.

[0008] The split movable beam is provided with a protruding action bar, the shearing tool is fixedly installed with the protruding action bar, a limited axis hole is provided in the protruding action bar, a limited support shaft is fixedly provided on the split movable beam, and the limited support shaft is inserted through the limited axis hole; A spring blind hole is provided in the protruding action strip, and a protruding spring is arranged in the spring blind hole. The protruding spring applies elastic thrust to the protruding action strip, so that the protruding action strip has an elastic tendency to move in a direction away from the fixed outer mold.

[0009] A limit frame is fixedly arranged on the split movable beam, a telescopic lock plate is limitedly arranged in the limit frame, the protruding action bar is limited and blocked by the telescopic lock plate, a lock plate slide groove is opened on the telescopic lock plate, a track pressure edge is slidably arranged in the lock plate slide groove, and a lock plate hydraulic cylinder for driving the track pressure edge to lift and lower is installed on the shear pressure beam.

[0010] An inner mold slide is arranged at the end position of the circular tube inner mold, a slide track is fixedly arranged on the base plate, the inner mold slide slides at the upper limit position of the slide track, a slide screw is inserted in the inner mold slide, and the inner mold slide is driven to slide along the surface of the slide track by the rotation of the slide screw.

[0011] A pushing gap is provided on the circular tube inner mold, and a gap push plate is arranged in the pushing gap. The gap push plate moves along the axis of the circular tube inner mold, so that the gap push plate can push the screen drum to move.

[0012] The slit push plate is fixedly provided with a center ring, a screw sleeve is provided on one side of the center ring, a synchronous clamping shaft is fixedly provided on the screw sleeve, the synchronous clamping shaft is inserted through the center ring for position limiting, a buffer spring is provided between the screw sleeve and the center ring, a push screw is spirally provided in the screw sleeve, and a screw motor for driving the push screw to rotate is installed on the inner mold slide seat; When the push screw rotates, the push screw drives the screw sleeve to move through the spiral fit, and the screw sleeve drives the center ring and the gap push plate to move along the axial direction of the inner mold of the round tube through the buffer spring.

[0013] A shearing gantry is fixedly arranged on the base plate, and a main hydraulic cylinder is arranged on the shearing gantry, and the shearing pressure beam is driven to move up and down by the main hydraulic cylinder; The outside of the annular airbag is connected to a pressure-controlled air nozzle, which penetrates through the side wall of the circular tube inner mold and extends into the interior of the circular tube inner mold. The air pressure in the annular airbag is controlled by the pressure-controlled air nozzle.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The shearing device for pressure screen processing of the present invention can quickly shear the screen drum of the pressure screen through the coordination of structures such as a fixed outer mold, a circular tube inner mold and an inner mold slide seat, thereby achieving length control of the screen drum processing, having the advantages of fast processing speed and convenient disassembly of the screen drum, and can avoid deformation of the screen drum during the shearing process, thereby ensuring stable quality control.

[0015] Through the coordination of the structures such as the split movable beam, the protruding action bar, the polishing grinding bar and the gap push plate, after the shearing pressure beam moves down to complete the shearing, the shearing surface of the screen drum can be polished during the process of the shearing pressure beam moving up and lifted, thereby improving the smoothness of the shearing surface and further improving the processing quality without reducing the work efficiency of the shearing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is the front view of the overall structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the overall structure of the present invention from another angle.

[0019] Figure 4 It is a half-section view of the overall structure of the present invention.

[0020] Figure 5 for Figure 4 A magnified schematic diagram of area A in the middle.

[0021] Figure 6 for Figure 4 Enlarged schematic diagram of area B in the middle.

[0022] Figure 7 for Figure 4 Enlarged schematic diagram of area C in the middle.

[0023] Figure 8 It is a half-section view from another angle of the overall structure of the present invention.

[0024] Fig. 9 for Figure 8 Enlarged schematic diagram of area D in the middle.

[0025] In the figure: 1, base plate; 2, shearing pressure beam; 3, shearing tool; 4, fixed outer mold; 5, round tube inner mold; 6, annular airbag; 201, split movable beam; 202, track slide groove; 203, limit slide rail; 204, return spring; 205, extrusion contact plate; 206, oscillation cam; 207, cam motor; 208, polishing grinding strip; 209, hidden vertical groove; 210, protruding action strip; 211, limit shaft hole; 212, limit support shaft; 213, spring blind hole; 214, protruding Outlet spring; 215, limit frame; 216, telescopic lock plate; 217, lock plate slide; 218, track pressure edge; 219, lock plate hydraulic cylinder; 7, inner mold slide; 501, push gap; 502, gap push plate; 503, center ring; 504, screw sleeve; 505, synchronous clamp shaft; 506, buffer spring; 507, push screw; 508, screw motor; 101, shear gantry; 102, main hydraulic cylinder; 601, pressure-controlled air nozzle; 701, slide track; 702, slide screw. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figures 1 to 9 The present invention provides a technical solution: a shearing device for pressure screen processing, such as Figure 4As shown in, it includes a base plate 1 and a shearing pressure beam 2 which is movable and lifted above the base plate 1, a shearing tool 3 for shearing is arranged on the shearing pressure beam 2, and the shearing tool 3 is driven to move up and down by the shearing pressure beam 2 to achieve shearing, and the shearing device also includes: a fixed outer mold 4 and a circular tube inner mold 5, the fixed outer mold 4 is fixedly installed between the base plate 1, and can be fixed by screws or integrally formed, the fixed outer mold 4 and the circular tube inner mold 5 cooperate with each other to support the screen drum inside and outside to prevent the screen drum from deforming during the shearing process; the circular tube inner mold 5 is in the shape of a circular tube, a cylindrical cavity is opened in the fixed outer mold 4, there is a gap between the outer surface of the circular tube inner mold 5 and the inner wall surface of the fixed outer mold 4, and the screen drum is arranged in the above gap and supported inside and outside; the circular tube inner mold 5 can move axially relative to the fixed outer mold 4, when the circular tube inner mold 5 is pulled out from the fixed outer mold 4, the screen drum on the circular tube inner mold 5 can be disassembled and assembled, when the circular tube inner mold 5 is inserted into the fixed outer mold 4, the end of the circular tube inner mold 5 close to the shearing tool 3 is flush with the surface of the fixed outer mold 4; The annular airbag 6 is embedded on the outer surface of the circular tube inner mold 5. Figure 6 As shown in the figure, an annular groove is provided on the surface of the circular tube inner mold 5, and the annular airbag 6 is in the annular groove. The annular airbag 6 is made of rubber and has elasticity. The annular airbag 6 is inflated to expand the annular airbag 6, so that the annular airbag 6 is in friction contact with the screen drum to lock the screen drum.

[0028] like Fig. 9 As shown in , a split movable beam 201 is arranged below the shearing pressure beam 2, a track slot 202 is provided on the lower surface of the shearing pressure beam 2, a limit slide rail 203 is fixedly arranged on the upper part of the split movable beam 201, and the limit slide rail 203 is slidably limited in the track slot 202. A return spring 204 is arranged between one end of the split movable beam 201 and the shearing pressure beam 2, a pressing contact plate 205 is fixedly arranged at the other end of the split movable beam 201, an oscillation cam 206 is arranged outside the pressing contact plate 205, the return spring 204 applies an elastic thrust to the split movable beam 201, so that the split movable beam 201 has an elastic tendency to move toward the direction of the oscillation cam 206, a cam motor 207 for driving the oscillation cam 206 to rotate is installed on the shearing pressure beam 2, and a polishing grinding strip 208 is fixedly arranged on the split movable beam 201.

[0029] A hidden vertical groove 209 is provided on the shearing tool 3, and the hidden vertical groove 209 corresponds to the position of the polishing and grinding strip 208. When the shearing tool 3 moves in a direction away from the fixed outer mold 4, the polishing and grinding strip 208 will protrude outward through the hidden vertical groove 209 and be higher than the side surface of the shearing tool 3 facing the fixed outer mold 4.

[0030] A protruding action bar 210 is provided on the split movable beam 201, the shearing tool 3 is fixedly installed with the protruding action bar 210, a limited position shaft hole 211 is provided in the protruding action bar 210, and a limited position support shaft 212 is fixedly provided on the split movable beam 201, and the limited position support shaft 212 is inserted through the limited position shaft hole 211; A spring blind hole 213 is provided in the protruding action bar 210 , and a protruding spring 214 is provided in the spring blind hole 213 . The protruding spring 214 applies elastic thrust to the protruding action bar 210 , so that the protruding action bar 210 has an elastic tendency to move in a direction away from the fixed outer mold 4 .

[0031] A limit frame 215 is fixedly provided on the split movable beam 201, and a telescopic lock plate 216 is provided in the limit frame 215 to limit the protruding action bar 210. A lock plate slide 217 is provided on the telescopic lock plate 216, and a track pressing edge 218 is slidably provided in the lock plate slide 217. A lock plate hydraulic cylinder 219 for driving the track pressing edge 218 to move up and down is installed on the shear pressure beam 2; when the split movable beam 201 oscillates back and forth along the length direction of the shear pressure beam 2, the telescopic lock plate 216 cooperates with the track pressing edge 218 through relative movement, such as Figure 5 As shown in FIG, a guiding inclined surface is provided at the lower portion of the telescopic lock plate 216. When the telescopic lock plate 216 moves downward, the protruding action bar 210 is squeezed and reset again through the provided guiding inclined surface.

[0032] An inner mold slide 7 is arranged at the end position of the circular tube inner mold 5, a slide track 701 is fixedly arranged on the base plate 1, the inner mold slide 7 slides at the upper limit position on the slide track 701, a slide screw 702 is inserted in the inner mold slide 7, and the inner mold slide 7 is driven to slide along the surface of the slide track 701 by the rotation of the slide screw 702.

[0033] A pushing slit 501 is provided on the circular tube inner mold 5 , and a slit push plate 502 is provided in the pushing slit 501 . The slit push plate 502 moves along the axis of the circular tube inner mold 5 , so that the slit push plate 502 can push the screen drum to move. A center ring 503 is fixedly provided on the gap push plate 502, and a screw sleeve 504 is provided on one side of the center ring 503. A synchronous clamping shaft 505 is fixedly provided on the screw sleeve 504, and the synchronous clamping shaft 505 is inserted through the center ring 503 for limiting. A buffer spring 506 is provided between the screw sleeve 504 and the center ring 503, and a pushing screw 507 is spirally provided in the screw sleeve 504. A screw motor 508 for driving the pushing screw 507 to rotate is installed on the inner mold slide 7; when the pushing screw 507 rotates, the pushing screw 507 drives the screw sleeve 504 to move through the spiral cooperation, and the screw sleeve 504 drives the center ring 503 and the gap push plate 502 to move along the axial direction of the circular tube inner mold 5 through the buffer spring 506.

[0034] A shearing gantry 101 is fixedly arranged on the base plate 1, and a main hydraulic cylinder 102 is arranged on the shearing gantry 101, which drives the shearing pressure beam 2 to move up and down; a pressure-controlled air nozzle 601 is arranged on the outside of the annular airbag 6, and the pressure-controlled air nozzle 601 passes through the side wall of the circular tube inner mold 5 and extends into the interior of the circular tube inner mold 5, and the air pressure in the annular airbag 6 is controlled by the pressure-controlled air nozzle 601.

[0035] The shearing device for pressure screen processing of the present invention controls the movement of the inner mold slide 7 and the circular tube inner mold 5 by controlling the rotation of the slide screw 702 when in use. The slide screw 702 can be driven by a motor; first, the circular tube inner mold 5 is controlled to move out from the fixed outer mold 4, and the screen drum of the pressure screen is sleeved on the circular tube inner mold 5. During shearing, the shearing position is flush with the end of the circular tube inner mold 5 away from the inner mold slide 7, and the position of the screen drum sleeved on the circular tube inner mold 5 is adjusted to achieve shearing length control; after the position is adjusted to be appropriate, compressed gas is input into the annular airbag 6 through the pressure-controlled air nozzle 601 to expand the annular airbag 6, and the annular airbag 6 is in frictional contact with the screen drum, so that the screen drum and the circular tube inner mold 5 are fixed to each other.

[0036] Control the inner mold 5 of the circular tube to move toward the fixed outer mold 4 so that the inner mold 5 of the circular tube is inserted into the fixed outer mold 4 until Figure 4 As shown in , at this time, the end of the round tube inner mold 5 away from the inner mold slide 7 is flush with the surface of the fixed outer mold 4; the main hydraulic cylinder 102 is controlled to drive the shearing pressure beam 2 and the shearing tool 3 to move downward to perform shearing, as shown in FIG. Figure 5 As shown in FIG. 2 , at this time, the polishing grinding strip 208 is located inside the hidden vertical groove 209 and does not protrude from the surface of the shearing tool 3, so no interference occurs during the shearing process.

[0037] After the cutting is completed, Figure 5 As shown in the figure, the telescopic lock plate 216 is driven to move upward by the lock plate hydraulic cylinder 219. When the telescopic lock plate 216 moves upward, the protruding action bar 210 loses the blocking limit of the telescopic lock plate 216. At this time, the protruding action bar 210 moves away from the split movable beam 201 under the elastic thrust of the protruding spring 214. Since the protruding action bar 210 and the shearing tool 3 are fixedly installed by screws, Figure 5As shown in the figure, the shearing tool 3 moves to the right, so that the polishing and grinding strip 208 protrudes outward through the hidden vertical groove 209; at the same time, the oscillation cam 206 is controlled to rotate by the cam motor 207, so that the oscillation cam 206 intermittently squeezes the extrusion contact plate 205. At this time, the split movable beam 201 will move along the length direction of the shearing pressure beam 2, and cooperate with the reset spring 204. The split movable beam 201 is reset by the elastic force of the reset spring 204, so that the split movable beam 201 oscillates back and forth along the length direction of the shearing pressure beam 2, and the polishing and grinding strip 208 is driven to oscillate back and forth through the split movable beam 201.

[0038] The annular airbag 6 is controlled to reduce pressure so that the annular airbag 6 no longer frictionally locks the screen drum; Figure 7 As shown in the figure, the screw motor 508 drives the screw 507 to rotate, so that the screw sleeve 504 moves to the right, and the screw sleeve 504 pushes the center ring 503 to the right through the buffer spring 506, so that the gap push plate 502 slides to the right in the push gap 501, and the gap push plate 502 contacts the screen drum, pushing the screen drum to move in the direction of the polishing grinding bar 208. At this time, the shear surface of the screen drum will contact the polishing grinding bar 208, and the shear surface of the screen drum will be ground and polished through the reciprocating oscillation of the polishing grinding bar 208; at this time, the shear pressure beam 2 gradually rises, changes the grinding and polishing position, and realizes comprehensive grinding and polishing of the shear surface of the screen drum; the rising and resetting of the shear pressure beam 2 is carried out simultaneously with the grinding and polishing, which will not reduce the shearing speed and greatly improve the processing efficiency.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A shearing device for pressure screen processing, comprising a base plate and a shearing pressure beam movable and arranged above the base plate, characterized in that: The shearing pressure beam is provided with a shearing tool for shearing, and the shearing pressure beam drives the shearing tool to move up and down to achieve shearing. The shearing device also includes: A fixed outer mold and a circular tube inner mold, wherein the fixed outer mold and the circular tube inner mold cooperate with each other to support the screen drum internally and externally, so as to prevent the screen drum from deforming during the shearing process; the circular tube inner mold is in the shape of a circular tube, and a cylindrical cavity is provided in the fixed outer mold. There is a gap between the outer surface of the circular tube inner mold and the inner wall surface of the fixed outer mold, and the screen drum is arranged in the above gap to be supported internally and externally; the circular tube inner mold can move axially relative to the fixed outer mold, and when the circular tube inner mold is pulled out from the fixed outer mold, the screen drum on the circular tube inner mold can be disassembled and assembled at this time, and when the circular tube inner mold is inserted into the fixed outer mold, the end of the circular tube inner mold close to the shearing tool is flush with the surface of the fixed outer mold; The annular airbag is embedded on the outer surface of the inner mold of the circular tube. The annular airbag is inflated to expand the annular airbag, thereby making the annular airbag frictionally contact with the screen drum to lock the screen drum.

2. A shearing device for pressure screen processing according to claim 1, characterized in that: A split movable beam is arranged below the shearing and pressing beam, a track groove is provided on the lower surface of the shearing and pressing beam, a limiting slide rail is fixedly arranged on the upper part of the split movable beam, and the limiting slide rail is slidably limited in the track groove.

3. A shearing device for pressure screen processing according to claim 2, characterized in that: A return spring is arranged between one end of the split movable beam and the shear pressure beam, and an extrusion contact plate is fixedly arranged at the other end of the split movable beam. An oscillation cam is arranged outside the extrusion contact plate. The return spring applies an elastic thrust to the split movable beam, so that the split movable beam has an elastic tendency to move toward the direction of the oscillation cam. A cam motor for driving the oscillation cam to rotate is installed on the shear pressure beam, and a polishing grinding strip is fixedly arranged on the split movable beam.

4. A shearing device for pressure screen processing according to claim 3, characterized in that: A hidden vertical groove is provided on the shearing tool, and the hidden vertical groove corresponds to the position of the polishing and grinding strip. When the shearing tool moves in a direction away from the fixed outer mold, the polishing and grinding strip will protrude outward through the hidden vertical groove and be higher than the side surface of the shearing tool facing the fixed outer mold.

5. A shearing device for pressure screen processing according to claim 4, characterized in that: The split movable beam is provided with a protruding action bar, the shearing tool is fixedly installed with the protruding action bar, a limited axis hole is provided in the protruding action bar, a limited support shaft is fixedly provided on the split movable beam, and the limited support shaft is inserted through the limited axis hole; A spring blind hole is provided in the protruding action strip, and a protruding spring is arranged in the spring blind hole. The protruding spring applies elastic thrust to the protruding action strip, so that the protruding action strip has an elastic tendency to move in a direction away from the fixed outer mold.

6. A shearing device for pressure screen processing according to claim 5, characterized in that: A limit frame is fixedly arranged on the split movable beam, a telescopic lock plate is limitedly arranged in the limit frame, the protruding action bar is limited and blocked by the telescopic lock plate, a lock plate slide groove is opened on the telescopic lock plate, a track pressure edge is slidably arranged in the lock plate slide groove, and a lock plate hydraulic cylinder for driving the track pressure edge to lift and lower is installed on the shear pressure beam.

7. A shearing device for pressure screen processing according to claim 1, characterized in that: An inner mold slide is arranged at the end position of the circular tube inner mold, a slide track is fixedly arranged on the base plate, the inner mold slide slides at the upper limit position of the slide track, a slide screw is inserted in the inner mold slide, and the inner mold slide is driven to slide along the surface of the slide track by the rotation of the slide screw.

8. A shearing device for pressure screen processing according to claim 7, characterized in that: A pushing gap is provided on the circular tube inner mold, and a gap push plate is arranged in the pushing gap. The gap push plate moves along the axis of the circular tube inner mold, so that the gap push plate can push the screen drum to move.

9. A shearing device for pressure screen processing according to claim 8, characterized in that: The slit push plate is fixedly provided with a center ring, a screw sleeve is provided on one side of the center ring, a synchronous clamping shaft is fixedly provided on the screw sleeve, the synchronous clamping shaft is inserted through the center ring for position limiting, a buffer spring is provided between the screw sleeve and the center ring, a push screw is spirally provided in the screw sleeve, and a screw motor for driving the push screw to rotate is installed on the inner mold slide seat; When the push screw rotates, the push screw drives the screw sleeve to move through the spiral fit, and the screw sleeve drives the center ring and the gap push plate to move along the axial direction of the inner mold of the round tube through the buffer spring.

10. A shearing device for pressure screen processing according to claim 1, characterized in that: A shearing gantry is fixedly arranged on the base plate, and a main hydraulic cylinder is arranged on the shearing gantry, and the shearing pressure beam is driven to move up and down by the main hydraulic cylinder; The outside of the annular airbag is connected to a pressure-controlled air nozzle, which penetrates through the side wall of the circular tube inner mold and extends into the interior of the circular tube inner mold. The air pressure in the annular airbag is controlled by the pressure-controlled air nozzle.

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