CN114798938A - Straight pipe section internal-supporting external-clamping type clamping boosting device for bending and forming thin-wall pipe - Google Patents
Straight pipe section internal-supporting external-clamping type clamping boosting device for bending and forming thin-wall pipe Download PDFInfo
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- CN114798938A CN114798938A CN202210403885.4A CN202210403885A CN114798938A CN 114798938 A CN114798938 A CN 114798938A CN 202210403885 A CN202210403885 A CN 202210403885A CN 114798938 A CN114798938 A CN 114798938A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
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Abstract
The invention discloses a straight pipe section internal-supporting and external-clamping type clamping boosting device for bending and forming a thin-wall pipe. Comprises a clamping device, a shape-preserving supporting device and a slide block driving part; a linear motor of the slide block driving part drives the inward-expanding shape-preserving slide block and the clamping slide block to slide on a T-shaped slide rail of a frame of the pipe bender, and the clamping slide block of the clamping device controls the clamping block to move along a sliding groove arranged on a bracket of the clamping device in the radial direction through the rotation of a clamping connecting rod, so that the function of clamping a straight pipe section of a thin-wall pipe is realized; the inner expansion support slider and the clamping slider of the inner expansion shape-preserving device move synchronously to drive the inner expansion pull rod to move along the axial direction, and the inclined wedge block fixedly connected with the inner expansion support block passes through the square groove of the inner expansion shape-preserving device bracket to be matched with the inclined plane of the wedge pull rod, so that the front-and-back movement of the inner expansion support slider is converted into the movement of the inner expansion support block expanding along the radial direction. The invention can realize the clamping boosting function of the bent straight pipe section of the thin-walled pipe and simultaneously achieve the effect of supporting and shape-preserving the inner side of the pipe wall in the clamping boosting process.
Description
Technical Field
The invention belongs to the field of thin-wall pipe bending forming, and particularly relates to a straight pipe section inner-supporting and outer-clamping type clamping boosting device for thin-wall pipe bending forming.
Background
With the wide application of thin-wall pipe fittings in the fields of vehicles, aviation, ships and the like, the bending forming technology of thin-wall pipes is continuously developed. Before the thin-wall pipe is bent and formed on the pipe bender, the pipe to be bent needs to be clamped and fixed on the numerical control pipe bender so as to position the pipe and match with a die of the pipe bender. In the clamping process, because the wall of the thin-wall pipe is very thin and the rigidity is poor, when the straight pipe section is clamped, the section of the clamping section is easy to deform due to high clamping force, and the bending performance and the forming quality of the thin-wall pipe fitting are affected.
At present, most of clamping devices for the straight pipe sections of the thin-wall pipe fittings used in industrial production only consider deformation of the outer sides of the pipe walls, but hardly realize shape preservation of the inner sides of the pipe walls while clamping the pipe fittings, and meet the requirements on section deformation control in the process of clamping the thin-wall pipe fittings.
Disclosure of Invention
In order to solve the problems in the background art, the invention discloses a straight pipe section internal-supporting and external-clamping type clamping boosting device for bending and forming a thin-wall pipe, which effectively solves the problem that the conventional thin-wall pipe straight pipe section clamping device cannot ensure that the section is not damaged and deformed in the clamping process. The clamping shape-preserving device can clamp the outer side of the elbow pipe and simultaneously realize shape preservation of the inner side of the pipe wall, synchronous control of the clamping and shape-preserving device is realized, and the quality of the straight pipe section of the thin-wall elbow pipe is improved.
The technical scheme adopted by the invention is as follows:
straight pipe section internal-supporting and external-clamping type clamping boosting device for bending and forming thin-wall pipe
The clamping boosting device comprises a clamping device, a shape-preserving supporting device and a slide block driving part, wherein the clamping device, the shape-preserving supporting device and the slide block driving part are arranged on a frame of the pipe bender; the outer wall of the pipe fitting is clamped inwards through the clamping device, the inner wall of the pipe fitting is propped outwards through the shape-preserving supporting device, and the sliding block driving part drives the clamping device and the shape-preserving supporting device to move simultaneously.
The sliding block driving part comprises a linear motor, a clamping cylindrical sliding block, an internal expansion supporting sliding block and a clamping shape-preserving connecting block; the T-shaped slide rail is arranged on the surface of the machine frame of the pipe bending machine, the clamping cylindrical sliding block, the clamping conformal connecting block and the internal expansion supporting sliding block are sequentially arranged on the surface of the machine frame of the pipe bending machine, and T-shaped sliding grooves are formed in the bottoms of the clamping cylindrical sliding block, the clamping conformal connecting block and the internal expansion supporting sliding block and are in matched connection with the T-shaped slide rail; the output shaft of the linear motor is connected with the internal expansion supporting slide block.
The shape-preserving supporting device comprises an internal expansion shape-preserving device bracket, a wedge-shaped pull rod and a plurality of arc supporting blocks; an internal expansion conformal device bracket is fixed between the clamping cylindrical sliding block and the internal expansion support sliding block, a support tube is arranged at one end of the internal expansion conformal device bracket close to the clamping cylindrical sliding block, the support tube extends into an annular hole formed in the clamping cylindrical sliding block, and a plurality of through grooves are formed in the circumferential direction of the support tube at equal intervals; the wedge-shaped pull rod is positioned in the supporting tube, one end of the wedge-shaped pull rod extends out of the central hole of the internal expansion shape-preserving device bracket and then is fixedly connected with the internal expansion supporting slide block, and the other end of the wedge-shaped pull rod is positioned at the position of the through groove in the supporting tube; a plurality of arc supporting blocks are circumferentially arranged on the outer peripheral surface of the supporting tube, and inclined wedges arranged on the inner side surfaces of the arc supporting blocks penetrate through the through grooves of the supporting tube and then are matched with inclined planes arranged at the ends of the wedge-shaped pull rods.
The clamping device comprises a clamping device bracket and a plurality of arc clamping blocks; a clamping device bracket is arranged on the side of the clamping cylindrical sliding block far away from the inner expansion supporting sliding block, and an annular hole which is coaxial with the clamping cylindrical sliding block is formed in the clamping device bracket; the arc clamping blocks are circumferentially arranged to form a columnar clamping structure, one end of the columnar clamping structure extends out of the annular hole of the clamping device support, and the other end of the columnar clamping structure is hinged with the clamping cylindrical sliding block.
Two ends of the clamping conformal connecting block are respectively connected with the front end surface of the internal expansion supporting sliding block and the rear end surface of the clamping cylindrical sliding block; the linear motor controls the inner expansion supporting sliding block to move axially along the T-shaped sliding rail, and the inner expansion supporting sliding block pushes the clamping cylindrical sliding block to move axially along the T-shaped sliding rail through the clamping conformal connecting block.
The columnar clamping structure, the columnar supporting structure, the clamping device bracket, the clamping cylindrical sliding block, the supporting pipe and the wedge-shaped pull rod are coaxially arranged.
The arc supporting block is mainly formed by vertically butting a replaceable inner arc plate and an inner expansion supporting plate through an inner hexagon bolt, and an inclined wedge block is fixed on the inner side surface of the inner expansion supporting plate; the arc clamping block is mainly formed by vertically butting a clamping block and a replaceable outer arc plate through an inner hexagon bolt; the outer circular surface of removable interior circular arc board is used for supporting the thin-walled tube inner wall that waits to bend, and the interior disc of removable outer circular arc board is used for pressing from both sides tight support to wait to bend the thin-walled tube outer wall, changes not unidimensional interior circular arc board and outer circular arc board according to the curvature radius and the wall thickness of waiting to bend the pipe.
The wedge-shaped pull rod is of a tubular structure, a square block is arranged at the other end of the wedge-shaped pull rod, and each surface of the square block, which corresponds to the through groove, is an inclined surface; the axial movement of the clamping cylindrical sliding block drives the axial movement of the wedge-shaped pull rod, and the axial movement of the wedge-shaped pull rod is converted into the radial movement of the arc-shaped supporting block through the surface contact with the inclined wedge block, so that the support of the pipe to be bent is realized. The core rod arranged at the center of the internal expansion supporting slide block extends into the wedge-shaped pull rod pipe through the central hole of the internal expansion shape-preserving device bracket.
The cylindrical supporting structure formed by the circumferential arrangement of the arc supporting blocks sequentially extends into the cylindrical clamping structure through the clamping cylindrical sliding block and the annular hole of the clamping device bracket; and a reset tension spring which is stretched along the radial direction is connected between the inner side surface of each circular arc supporting block and the outer peripheral surface of the supporting tube.
Each clamping block on the columnar clamping structure is provided with a T-shaped sliding block protruding outwards at the edge position of the side face, sliding grooves extending along the radial direction and corresponding to the T-shaped sliding blocks are formed in the clamping device support at intervals in the circumferential direction, and the T-shaped sliding blocks extend into the sliding grooves and move along the radial direction of the sliding grooves; the outer peripheral surface of the clamping cylindrical sliding block is provided with lug seats corresponding to the T-shaped sliding block at intervals, one end of the clamping connecting rod is hinged with the lug seats on the clamping cylindrical sliding block, and the other end of the clamping connecting rod is hinged with the lug seats on the T-shaped sliding block.
The axial movement of the clamping cylindrical sliding block drives the clamping connecting rod to rotate, so that the axial movement of the clamping cylindrical sliding block is converted into the radial movement of the clamping block, and the clamping of the pipe to be bent is realized.
The use method of the straight pipe section internal-supporting external-clamping type clamping boosting device for bending and forming the thin-wall pipe comprises the following steps:
1) the pipe to be bent is stretched into the space between the columnar clamping structure and the columnar supporting structure, and the linear motor is controlled to work according to the radius and the wall thickness of the pipe to be bent:
a piston of the linear motor pushes an inner expansion supporting slide block and a clamping cylindrical slide block to move backwards along the axial direction of the T-shaped slide rail, the inner expansion supporting slide block pushes a wedge-shaped pull rod to move, the inclined plane of the wedge-shaped pull rod acts on an inclined wedge block, the inclined wedge block is enabled to move outwards in a square groove of a supporting tube in a radial direction, an arc supporting block is driven to be expanded in the tube, pressure is provided for the inner wall of a pipe to be bent, and a shape-preserving supporting function is achieved;
the area of the overlapped part of the inclined plane at the end part of the wedge-shaped pull rod and the inclined wedge block is smaller, the distance of outward movement of the inclined wedge block along the radial direction is longer until the inclined plane and the inclined wedge block are not overlapped completely, at the moment, the internal expansion supporting block is expanded to the maximum expansion state, and the axial position of the inclined wedge block is kept unchanged.
The clamping cylindrical sliding blocks move backwards along the axial direction, and the rotating pairs formed by the lug seats and the clamping connecting rods drive the clamping connecting rods to rotate forwards, so that the T-shaped sliding blocks on all the arc clamping blocks are driven to move radially along the sliding grooves of the clamping device bracket, the arc clamping blocks are fixed along the axial position and move in the radial direction close to the axis, and inward clamping of the pipe to be bent is realized;
2) resetting the device:
the linear motor controls the inner expansion supporting slide block to move forwards along the axial direction to drive the wedge-shaped pull rod to move forwards, the reset tension spring connected with the inner expansion shape-preserving device support releases elastic potential energy, and the arc supporting block is pulled to move along the radial direction to be close to the axis, so that the shape-preserving supporting device is reset;
the clamping cylindrical sliding block and the inner expansion supporting sliding block move backwards along the axial direction simultaneously, the clamping cylindrical sliding block drives the clamping pull rod to rotate reversely, the T-shaped sliding block on the arc clamping block moves along the radial direction of the sliding groove of the clamping device support under the driving of the clamping pull rod, namely the arc clamping block moves towards the radial direction far away from the axis, and the automatic resetting of the clamping device is completed.
The arc clamping blocks and the arc supporting blocks provide pressure to the inner side and the outer side of the pipe wall of the pipe to be bent in the inward clamping and outward expanding processes, so that the friction force of the pipe in the boosting process is increased, and the boosting of the pipe is facilitated.
The invention has the beneficial effects that:
1) the invention controls the synchronous movement of the clamping slide block and the internal expansion supporting slide block to cause the internal expansion supporting piece to be outwards spread on the inner side of the pipe wall, simultaneously causes the clamping block to be inwards clamped outside the pipe, and the internal expansion shape-preserving device provides support inside the pipe fitting to realize the shape-preserving function of the thin-wall pipe straight pipe section, and prevents the section from deforming due to overlarge clamping force of the clamping device.
2) The pipe pushing assisting device can increase the pressure on the inner side and the outer side of the pipe through the clamping force and the inner expansion force respectively applied to the inner side and the outer side of the pipe, further increase the friction force obtained during pipe pushing assisting, and realize the purpose of providing larger pushing assisting force.
3) The invention can realize the clamping shape-preserving function of the straight pipe sections of pipes with different diameters and different wall thicknesses by replacing the outer arc plate and the inner arc plate according to the processing and production requirements.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic cross-sectional structure of the present invention.
FIG. 3 is a schematic view of the conformal support apparatus of the present invention, wherein (a) is a perspective view and (b) is a cross-sectional view.
Fig. 4 is a schematic structural view of the clamping device of the present invention, wherein (a) is a perspective view and (b) is a sectional view.
Fig. 5 is a schematic structural diagram of the arc clamping block of the invention.
FIG. 6 is a schematic view of the clamping cylindrical slider structure of the present invention
FIG. 7 is a schematic view of the stent structure of the internal expansion conformal device of the invention.
FIG. 8 is a schematic diagram of the principal structure of the conformal support apparatus of the present invention; (a) the structural schematic diagram of the inner expansion supporting block and the replaceable inner arc plate is shown, and the structural schematic diagram of the wedge-shaped pull rod is shown in the step (b).
Fig. 9 is a schematic view of a slider driving apparatus according to the present invention.
FIG. 10 is a schematic view of the outward expansion of the internally expanding support bloc of the present invention; (a) and (b) two state diagrams of the beginning and the completion of the internal expanding support respectively.
FIG. 11 is a schematic illustration of the inward clamping process of the clamping blocks of the present invention; (a) and (b) two state diagrams of clamping start and finish respectively.
In the figure: the device comprises a clamping device 1, a shape-preserving supporting device 2, a slider driving device 3, a replaceable outer arc plate 4, a clamping device bracket 5, a clamping cylindrical slider 6, an inner expansion supporting plate 7, a wedge-shaped pull rod 8, an inner expansion supporting slider 9, a linear motor 10, a clamping connecting rod 11, a clamping block 12, a replaceable inner arc plate 13, a T-shaped slider 14, an ear seat 15, an inner expansion shape-preserving device bracket 16, an inclined wedge block 17, a supporting tube 18, a clamping shape-preserving connecting block 19, a pipe bender frame 20 and a reset tension spring 21.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in figure 1, the invention comprises a clamping device 1, a conformal supporting device 2 and a slide block driving part 3, wherein the clamping device and the conformal supporting device are connected together through a slide block of the slide block driving part, and the slide block driving part adopts a linear motor.
As shown in fig. 2 and 9, the slide block driving part 3 comprises a pipe bender frame 20, a linear motor 10, a clamping cylindrical slide block 6, an internal expansion supporting slide block 9 and a clamping conformal connecting frame 19. The middle of the clamping cylindrical sliding block 6 is provided with a hole for placing a thin-walled tube, and the bottom of the clamping cylindrical sliding block is provided with a T-shaped sliding chute matched with a T-shaped sliding rail on the frame 20 of the tube bending machine. The middle of the internal expansion supporting slide block 9 is provided with a hole for placing a core rod, the bottom of the internal expansion supporting slide block is provided with a T-shaped sliding groove, the front and back movement is realized on a T-shaped sliding rail, and the front end surface of the internal expansion supporting slide block 9 is connected with the rear end surface of the clamping conformal connecting frame 19. The linear motor 10 is arranged at the rear side of the pipe bender frame 20 and provides power for the movement of the slide block. A piston in the linear motor 10 is connected with the rear end face of the inner expansion supporting slide block 9, and synchronous control of inward clamping of the clamping block 12 in the radial direction and outward expansion of the inner expansion supporting block 7 in the radial direction is realized through the back-and-forth movement of the piston along the axial direction of the pipe.
As shown in fig. 4, 5 and 6, the clamping device comprises four clamping blocks 12 arranged circumferentially, a replaceable outer circular arc plate 4, a clamping device bracket 5, a clamping connecting rod 11 and a clamping cylindrical sliding block 6. Four T-shaped sliding grooves extending along the radial direction are circumferentially arranged on the clamping device bracket 5 at intervals, the inner circular surface of the clamping block 12 is connected with the replaceable outer arc plate 4 through an inner hexagon bolt, the T-shaped sliding block 14 is fixedly connected to the rear side of the clamping block, and the clamping block moves along the radial direction in the T-shaped sliding grooves, and the axial position of the clamping block is kept unchanged. The T-shaped sliding block 14 is connected with the clamping connecting rod 11 through the lug seat 15, the other end of the clamping connecting rod 11 forms a revolute pair with the clamping cylindrical sliding block 6 through the lug seat 15, the clamping connecting rod 11 is driven to rotate through the axial movement of the clamping cylindrical sliding block 6, the axial movement of the clamping cylindrical sliding block 6 is converted into the radial movement of the clamping block 12, and the four clamping blocks 12 drive the replaceable outer arc plate 4 to move simultaneously to realize the clamping process of the straight pipe section of the thin-walled pipe.
As shown in fig. 3, 7 and 8, the conformal supporting device comprises four inner expansion supporting blocks 7 which are circumferentially arranged, a replaceable inner circular arc plate 13, an inclined wedge block 17, an inner expansion conformal device bracket 16, a wedge-shaped pull rod 8 and an inner expansion supporting slide block 9. The outer circular surface of the internal expansion supporting block 7 is connected with the replaceable inner circular arc plate 13 through a hexagon socket head cap screw, the inner circular surface is fixedly connected with the wedge block 17, a square groove is formed in the middle of the internal expansion shape-preserving device support 16, the wedge block 17 penetrates through the square groove to be matched with the square inclined surface of the conical section on the wedge-shaped pull rod 8, the area of the overlapped part of the square inclined surface and the wedge block 17 is smaller, the farther the distance of outward movement of the wedge block 17 along the inner diameter direction is, the square inclined surface is not overlapped with the wedge block 17 completely, and the internal expansion supporting block 7 is expanded to the maximum opening state at the moment. The outer circular surface of the internal expansion shape-preserving device support 16 is fixedly connected with four reset springs 21 which are circumferentially spaced, and the support is connected with the internal expansion supporting block 7 to realize the reset of the internal expansion support. The rear side of the wedge-shaped pull rod 8 is connected with an inner expansion supporting slide block 9 through a bolt. The axial movement of the internal expansion supporting slide block 9 and the clamping cylindrical slide block 6 drives the axial movement of the wedge-shaped pull rod 8, thereby controlling the radial movement of the internal expansion supporting block 7.
The wedge block is matched along the square inclined plane of the tapered section of the wedge-shaped pull rod, the axial movement of the wedge-shaped pull rod is converted into radial movement through surface contact with the wedge block, the wedge block is matched with the wedge-shaped pull rod in the square groove to move radially, and the axial position of the wedge block is kept unchanged.
The specific embodiment is as follows:
and after the curvature radius and the wall thickness of the pipe are confirmed, the outer arc plate and the inner arc plate are replaced.
1) The linear motor is controlled to work according to the requirements of the radius and the wall thickness of a pipe to be bent, a piston in the linear motor pushes an inner expansion supporting slide block 9 and a clamping cylindrical slide block 6 to do axial motion along a T-shaped slide rail on a shape-preserving clamping rack, the inner expansion supporting slide block 9 pushes a wedge-shaped pull rod 8 to move, a square inclined plane of the wedge-shaped pull rod 8 acts on an inclined wedge block 17, the inclined wedge block 17 makes radial motion in a square groove in an inner expansion shape-preserving device support 16, an inner expansion supporting block 7 is driven to be expanded in the pipe, pressure is provided for the inner wall of the pipe, and the shape-preserving supporting function is achieved. The clamping cylindrical sliding block 6 and the inner expansion supporting sliding block 9 synchronously move under the driving of the cylinder piston, the clamping cylindrical sliding block 6 moves backwards along the axial direction, a rotating pair formed by the lug seat 15 and the clamping connecting rod 11 drives the clamping connecting rod 11 to rotate, the other end of the rotating pair is connected with a T-shaped sliding rail of the clamping block 12, the clamping block 12 is fixed along the axial position and moves in a T-shaped sliding groove of the clamping cylindrical sliding block in the radial direction close to the axial line, and the movement of clamping inwards along the pipe diameter is completed.
As shown in fig. 10, when the linear motor adjusts the piston to push the inner expansion supporting slider 9 to move to the right, the wedge-shaped pull rod 8 moves to the right, the overlapping portion between the square inclined surface of the wedge-shaped pull rod 8 and the inclined surface of the wedge 17 is reduced, the position of the wedge 17 along the axial direction is unchanged, the wedge-shaped pull rod 8 moves in the direction that the inclined surface is far away from the axis along the radial direction, and the inner expansion supporting block 7 and the replaceable inner arc plate 13 move radially outwards along with the wedge 17 to complete the outward opening movement along the pipe.
As shown in fig. 11, when the linear motor adjusting piston pushes the clamping cylindrical slider 6 to move right, the clamping link rod 11 is pulled rightwards, so that the clamping pull rod 11 rotates counterclockwise around the ear seat 15, the T-shaped slider 14 at the rear side of the clamping block 12 is connected with the other end of the clamping pull rod through the ear seat 15, the T-shaped slider moves in the T-shaped chute of the clamping device bracket 5 in the radial direction along the direction close to the axis under the action of the force generated by the counterclockwise rotation of the clamping pull rod, and the clamping block 12 moves in the axis direction, thereby achieving the clamping function.
2) After the action of the inner support and the outer clamp is finished, the linear motor controls the piston to drive the inner expansion supporting slide block 9 and the clamping cylindrical slide block 6 to move leftwards, the wedge-shaped pull rod 8 is driven to move leftwards, the reset tension spring 21 connected with the inner expansion shape-preserving device support 16 releases elastic potential energy, the inclined wedge block is pulled to move along the radial direction close to the axis, and the shape-preserving supporting device is reset.
The clamping cylindrical sliding block 6 drives the clamping pull rod to rotate clockwise, so that the T-shaped sliding block 14 on the clamping block 12 is controlled to move away from the axis in the radial direction in the T-shaped sliding rail, the clamping block 12 is driven to be unfolded outwards, and resetting is achieved.
The clamping blocks 12 and the internal expansion supporting sliding blocks 9 provide pressure for the inner side and the outer side of the pipe wall in the processes of inward clamping and outward expanding, so that the friction force obtained by the pipe in the boosting process is increased, and the boosting function for the thin-walled pipe is facilitated.
Claims (9)
1. A straight pipe section internal-supporting external-clamping type clamping boosting device for bending and forming a thin-wall pipe is characterized by comprising a clamping device (1), a shape-preserving supporting device (2) and a slide block driving part (3), wherein the clamping device is installed on a machine frame (20) of a pipe bending machine; the outer wall of the pipe fitting is clamped inwards through the clamping device (1), the inner wall of the pipe fitting is propped outwards through the shape-preserving supporting device (2), and the sliding block driving part (3) drives the clamping device (1) and the shape-preserving supporting device (2) to move simultaneously;
the sliding block driving part (3) comprises a linear motor (10), a clamping cylindrical sliding block (6), an internal expansion supporting sliding block (9) and a clamping conformal connecting block (19); the surface of a frame (20) of the pipe bending machine is provided with a T-shaped sliding rail, a clamping cylindrical sliding block (6), a clamping shape-preserving connecting block (19) and an inner expansion supporting sliding block (9) are sequentially arranged on the surface of the frame (20) of the pipe bending machine, and T-shaped sliding grooves are formed in the bottoms of the clamping cylindrical sliding block (6), the clamping shape-preserving connecting block (19) and the inner expansion supporting sliding block (9) and are in matched connection with the T-shaped sliding rail; an output shaft of the linear motor (10) is connected with the internal expansion supporting slide block (9);
the shape-preserving supporting device (2) comprises an internal expansion shape-preserving device bracket (16), a wedge-shaped pull rod (8) and a plurality of arc supporting blocks; an internal expansion conformal device support (16) is fixed between the clamping cylindrical sliding block (6) and the internal expansion support sliding block (9), a support tube (18) is arranged at one end, close to the clamping cylindrical sliding block (6), of the internal expansion conformal device support (16), the support tube (18) extends into an annular hole formed in the clamping cylindrical sliding block (6), and a plurality of through grooves are formed in the support tube (18) at equal intervals in the circumferential direction; the wedge-shaped pull rod (8) is positioned in the supporting tube (18), one end of the wedge-shaped pull rod (8) extends out of a central hole of the internal expansion shape-preserving device bracket (16) and then is fixedly connected with the internal expansion supporting slide block (9), and the other end of the wedge-shaped pull rod (8) is positioned at a through groove in the supporting tube (18); a plurality of arc supporting blocks are circumferentially arranged on the outer peripheral surface of the supporting pipe (18), and inclined wedges (17) arranged on the inner side surfaces of the arc supporting blocks penetrate through grooves of the supporting pipe (18) and then are matched with inclined surfaces arranged at the end parts of the wedge-shaped pull rods (8);
the clamping device (1) comprises a clamping device bracket (5) and a plurality of arc clamping blocks; a clamping device bracket (5) is arranged on the side of the clamping cylindrical sliding block (6) far away from the inward expansion supporting sliding block (9), and an annular hole which is coaxial with the clamping cylindrical sliding block (6) is formed in the clamping device bracket (5); the arc clamping blocks are circumferentially arranged to form a columnar clamping structure, one end of the columnar clamping structure extends out of the annular hole of the clamping device support (5), and the other end of the columnar clamping structure is hinged with the clamping cylindrical sliding block (6).
2. The straight pipe section internal-expanding and external-clamping type clamping boosting device for bending and forming the thin-walled pipe is characterized in that two ends of a clamping conformal connecting block (19) are respectively connected with the front end surface of an internal-expanding supporting slide block (9) and the rear end surface of a clamping cylindrical slide block (6); the linear motor (10) is used for controlling the inner expansion supporting sliding block (9) to axially move along the T-shaped sliding rail, and the inner expansion supporting sliding block (9) pushes the clamping cylindrical sliding block (6) to axially move along the T-shaped sliding rail through the clamping conformal connecting block (19).
3. The straight pipe section internal-expanding and external-clamping type clamping and boosting device for bending and forming the thin-walled pipe is characterized in that the arc supporting block mainly comprises an exchangeable inner arc plate (13) and an internal-expanding supporting plate (7) which are butted up and down through bolts, and an inclined wedge block (17) is fixed on the inner side surface of the internal-expanding supporting plate (7); the arc clamping block is mainly formed by vertically butting a clamping block (12) and a replaceable outer arc plate (4) through bolts;
the outer circular surface of the replaceable inner circular arc plate (13) is used for supporting the inner wall of the pipe to be bent, the inner circular surface of the replaceable outer circular arc plate (4) is used for clamping and supporting the outer wall of the pipe to be bent, and the inner circular arc plate (13) and the outer circular arc plate (4) with different sizes are replaced according to the curvature radius and the wall thickness of the pipe to be bent.
4. The straight pipe section internal-bracing external-clamping type clamping boosting device for bending and forming the thin-walled pipe is characterized in that the wedge-shaped pull rod (8) is of a tubular structure, a square block is arranged at the other end of the wedge-shaped pull rod (8), and each surface of the square block, corresponding to the through groove, is provided with an inclined surface;
the axial movement of clamping the cylindrical sliding block (6) drives the axial movement of the wedge-shaped pull rod (8), the axial movement of the wedge-shaped pull rod (8) is converted into the radial movement of the arc-shaped supporting block through the surface contact with the inclined wedge block (17), and the support of the pipe to be bent is realized.
5. The straight pipe section internal-bracing external-clamping type clamping boosting device for bending and forming the thin-walled pipe is characterized in that a cylindrical supporting structure formed by a plurality of arc supporting blocks in a circumferential arrangement sequentially extends into the cylindrical clamping structure through annular holes of a clamping cylindrical sliding block (6) and a clamping device bracket (5); a return tension spring (21) is connected between the inner side surface of each arc supporting block and the peripheral surface of the supporting tube (18).
6. The straight pipe section internal-expanding and external-clamping type clamping boosting device for bending and forming the thin-walled pipe is characterized in that each clamping block (12) on the columnar clamping structure is provided with T-shaped sliding blocks (14) protruding outwards at the edge positions of the side faces, sliding grooves extending in the radial direction and corresponding to the positions of the T-shaped sliding blocks (14) are circumferentially spaced on the clamping device bracket (5), and the T-shaped sliding blocks (14) extend into the sliding grooves and move in the radial direction of the sliding grooves;
ear seats corresponding to the T-shaped sliding blocks (14) are arranged on the outer peripheral surfaces of the clamping cylindrical sliding blocks (6) at intervals, one ends of the clamping connecting rods (11) are hinged with the ear seats on the clamping cylindrical sliding blocks (6), and the other ends of the clamping connecting rods are hinged with the ear seats on the T-shaped sliding blocks (14).
7. The straight pipe section internal-expanding and external-clamping type clamping boosting device for bending and forming the thin-walled pipe is characterized in that the clamping connecting rod (11) is driven to rotate by the axial movement of the clamping cylindrical sliding block (6), and the axial movement of the clamping cylindrical sliding block (6) is converted into the radial movement of the clamping block (12), so that the clamping of the pipe to be bent is realized.
8. The use method of the straight pipe section internal-bracing external-clamping type clamping boosting device for the bending forming of the thin-walled pipe as claimed in any one of claims 1 to 7 is characterized by comprising the following steps:
1) the pipe to be bent is stretched into the space between the columnar clamping structure and the columnar supporting structure, and the linear motor (10) is controlled to work according to the radius and the wall thickness of the pipe to be bent:
a piston of a linear motor (10) pushes an inner expansion supporting slide block (9) and a clamping cylindrical slide block (6) to move backwards along the axial direction of a T-shaped slide rail, the inner expansion supporting slide block (9) pushes a wedge-shaped pull rod (8) to move, and the inclined plane of the wedge-shaped pull rod (8) acts on an inclined wedge block (17), so that the inclined wedge block (17) does radial motion outwards in a square groove of a supporting pipe (18), and drives an arc supporting block to be expanded in the pipe, so that pressure is provided for the inner wall of a pipe to be bent, and a shape-preserving supporting function is realized;
the clamping cylindrical sliding block (6) moves backwards along the axial direction, a rotating pair formed by the lug seat and the clamping connecting rod (11) drives the clamping connecting rod (11) to rotate in the forward direction, so that the T-shaped sliding blocks (14) on all the arc clamping blocks are driven to move along the radial direction of the sliding groove of the clamping device support (5), the arc clamping blocks are fixed along the axial position and move towards the radial direction close to the axis, and the pipe to be bent is clamped inwards;
2) resetting the device:
the linear motor (10) controls the inner expansion supporting slide block (9) to move forwards along the axial direction to drive the wedge-shaped pull rod (8) to move forwards, the reset tension spring (21) connected with the inner expansion shape-preserving device bracket (16) releases elastic potential energy, and the circular arc supporting block is pulled to move along the radial direction to be close to the axial line, so that the shape-preserving supporting device (2) is reset;
the clamping cylindrical sliding block (6) and the inner expansion supporting sliding block (9) move backwards along the axial direction simultaneously, the clamping cylindrical sliding block (6) drives the clamping pull rod (11) to rotate reversely, the T-shaped sliding block (14) on the arc clamping block moves along the radial direction of the sliding groove of the clamping device support (5) under the driving of the clamping pull rod (11), namely, the arc clamping block moves towards the radial direction far away from the axis, and the automatic resetting of the clamping device (1) is completed.
9. The use method of the straight pipe section internal-expanding and external-clamping type clamping boosting device for bending and forming the thin-walled pipe as claimed in claim 8 is characterized in that the arc clamping blocks and the arc supporting blocks provide pressure to the inner side and the outer side of the pipe wall of the pipe to be bent in the processes of inward clamping and outward expanding, so that the friction force of the pipe in the boosting process is increased, and the boosting of the pipe is facilitated.
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| CN202210403885.4A CN114798938B (en) | 2022-04-18 | 2022-04-18 | Straight pipe section internal support external clamping type clamping boosting device for thin-wall pipe bending forming |
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| CN202210403885.4A CN114798938B (en) | 2022-04-18 | 2022-04-18 | Straight pipe section internal support external clamping type clamping boosting device for thin-wall pipe bending forming |
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| CN117245021B (en) * | 2023-11-20 | 2024-01-23 | 自贡长盈精密技术有限公司 | High-precision rotatable angle aluminum product straightening device |
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