CN210876786U - High-precision pipe shrinking machine - Google Patents

Abstract

The utility model discloses a high accuracy draw machine, including draw device and material feeding unit, draw the pipe mould of draw device is in the radial guide slot of die carrier main shaft front end to the movable support, draw the pipe mould outer end still movable support in the radial guide slot has the strike piece, strike piece outer end rotation support have with link firmly the gyro wheel of the internal tooth impeller rolling contact on the draw support, material feeding unit's two feed rollers rotate the support respectively and are put up and put down on roller frame, it is equipped with wear-resisting piece to inlay on the feed roller working face, feed roller and pay-off driving motor flexible drive on the lower roll frame are connected, the lower roll frame passes through the lift double-screw bolt, adjusting nut and worm wheel pair are adjusted from top to bottom and are linked firmly on the pay-off support, it drives actuating cylinder drive pendulum supporting on the pay-off support by the. Adopt the utility model discloses a high accuracy draw machine can carry out even radial symmetry to the bar head end and hit the beating to can the concentricity of quick adjustment bar and draw the device, improve feed roll wear resistance, promote draw tube processingquality.

Description

High-precision pipe shrinking machine

Technical Field

The utility model relates to a metal processing equipment especially relates to a draw pipe equipment that metal bar or pipe drawing process used in coordination.

Background

The pipe reducing equipment is applied to the previous process of cold drawing processing of metal bars (or pipes) and is used for striking one end of the metal bar to be drawn to enable the diameter of the metal bar to be reduced and the metal bar to pass through a die hole of a drawing die in the drawing equipment to be clamped by a drawing machine for drawing operation, and the metal bar to be drawn is drawn through the drawing die to obtain the specification size and the precision corresponding to the drawing die hole. The pipe reducing process has to meet certain quality requirements, and if the shape of the end part after pipe reducing is irregular and the position precision between the end part and the body of the bar is low, the centering can not be realized, the drawing process can be smoothly carried out, and the quality of the finished product after drawing process is greatly influenced. The conventional pipe reducing device adopts a mechanism similar to an air hammer to radially strike the head end of a metal bar to be drawn, and has the advantages of low striking frequency, poor forming and low efficiency; in the pipe reducing process, a pipe to be reduced is conveyed out of and into the pipe reducing device through a feeding device consisting of an upper feeding roller and a lower feeding roller, and the pipe to be reduced is also required to rotate continuously to enable the head end to be uniformly struck in the circumferential direction to be well formed, in the feeding process, the concentric position between the rod to be clamped and conveyed and the pipe reducing device is required to be kept so as to ensure the position precision between the rod and the body of the rod, in order to ensure the concentric requirement, the feeding roller positioned below is required to be capable of adjusting the height, the adjusting function is generally carried out through at least three adjusting rods arranged between a feeding roller bracket and a feeding device bracket, namely, the feeding roller bracket is arranged on the feeding device bracket through at least three adjusting rods, the height of the feeding rollers is adjusted through one-by-one operation of at least three adjusting rods, and the problem of the adjusting, if the diameter of the bar stock to be contracted changes relatively frequently, the adjusting process is slow, and the efficiency is low; in addition, two feeding rollers in the feeding device drive the bar stock of the contracted pipe to axially move and rotate, the work load is heavy, the abrasion is serious, the service life of the feeding device is short, the quality of the contracted pipe is reduced, and the drawing processing precision is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a high accuracy draw machine is provided to the aforesaid that exists is not enough to prior art, the utility model aims to solve provides a high accuracy draw machine, and it can carry out even radial symmetry to the bar head end and hit the beating to can the concentricity of quick adjustment bar and draw pipe device, improve feed roll wear resistance, promote draw pipe processingquality.

In order to solve the technical problem, the high-precision pipe reducing machine of the utility model comprises a pipe reducing device and a feeding device, the pipe reducing device comprises a pipe reducing device bracket and pipe reducing dies arranged in pairs, the opposite surfaces of the two pipe reducing dies arranged in pairs are pipe reducing working surfaces, the feeding device comprises a feeding support, an upper feeding roller and a lower feeding roller which are supported on the feeding support, the axial spaces of the two feeding rollers are crossed, the generatrix of the working surface of each feeding roller is a hyperbola, the pipe reducing die is movably supported in a radial guide groove at the front end of the die carrier main shaft, the die carrier main shaft is rotatably supported on a bracket of the pipe reducing device, an internal tooth impeller is arranged at the periphery of the front end of the die carrier main shaft, the inner tooth wave wheel is fixedly connected on the pipe contracting device bracket, the inner wall of the inner tooth wave wheel is provided with circular arc teeth which are evenly distributed along the circumferential direction, the number of the circular arc teeth is even, and the axis of the internal tooth impeller is positioned on the central line of the die carrier main shaft; a striking block is movably supported in a radial guide groove at the front end of the die carrier main shaft, the striking block is positioned between a pipe reducing die and the inner tooth impeller, a roller is rotatably supported at one end of the striking block, which is opposite to the inner tooth impeller, the outer circle of the roller is in rolling contact with the arc teeth on the inner wall of the inner tooth impeller, and the die carrier main shaft is in transmission connection with a die carrier main shaft driving device through a main shaft driving wheel; the two feed rollers are respectively supported on the upper roller frame and the lower roller frame in a rotating way, the feed rollers which are supported on the lower roller frame in a rotating way are in flexible transmission connection with a feed driving motor, a lifting stud is arranged at the lower end of the lower roller frame, the ratio D/L of the thread diameter D of the lifting stud to the length L of the working surface of the feed roller is 0.7 to 1.5, an adjusting nut is screwed on the lifting stud, the adjusting nut is rotatably supported on the feeding bracket, a worm wheel is arranged on the outer circumference of the adjusting nut, a worm meshed with the worm wheel is rotatably supported on the feeding bracket, one end of the worm is provided with an adjusting operation part, a limit guide rod is arranged between the lower roller frame and the feeding bracket, the upper roller frame is supported on the feeding bracket in a swinging way, a swing driving cylinder is arranged between the upper roller frame and the feeding support, a wear-resistant block is embedded on the working surface of the feeding roller, and the outer surface of the wear-resistant block is positioned on the working surface of the feeding roller.

In the structure, the pipe reducing die is movably supported in a radial guide groove at the front end of a die carrier main shaft, the die carrier main shaft is rotatably supported on a pipe reducing device support, an inner tooth impeller is arranged at the periphery of the front end of the die carrier main shaft and fixedly connected to the pipe reducing device support, arc teeth are uniformly distributed along the circumferential direction on the inner wall of the inner tooth impeller, the number of the arc teeth is even, the axis of the inner tooth impeller is positioned on the central line of the die carrier main shaft, a striking block is also movably supported in the radial guide groove at the front end of the die carrier main shaft and positioned between the pipe reducing die and the inner tooth impeller, a roller is rotatably supported at one end of the striking block, which is opposite to the inner tooth impeller, the outer circle of the roller is in rolling contact with the arc teeth on the inner wall of the inner tooth impeller, the die carrier main shaft is in transmission connection with a die carrier main shaft driving device through a main shaft driving wheel, and the striking block rotating along with the die, make the pipe reducing mould by the continuous point-by-point radial hitting of going on of draw pipe bar along circumference, and the pipe reducing mould radially sets up in pairs, the bar that is contracted will be at the plastic deformation of radial production symmetry, thereby make and keep the axiality between draw position and the bar body after the pipe reducing, the position precision is high, hit the process of beating moreover and rotate and constantly go on along circumference along with the die carrier main shaft, will form the cylinder that good radial dimension equals by the draw position, thereby can guarantee to take shape well, draw pipe processingquality is high.

The two feed rollers are respectively rotatably supported on an upper roller frame and a lower roller frame, the feed rollers rotatably supported on the lower roller frame are in flexible transmission connection with a feed driving motor, the lower end of the lower roller frame is provided with a lifting stud, the ratio D/L of the thread diameter D of the lifting stud to the length L of the working surface of the feed rollers is 0.7-1.5, an adjusting nut is rotatably connected onto the lifting stud, the adjusting nut is rotatably supported on a feed bracket, the outer circumference of the adjusting nut is provided with a worm wheel, the worm meshed with the worm wheel is rotatably supported on the feed bracket, one end of the worm is provided with an adjusting operating part, a limit guide rod is arranged between the lower roller frame and the feed bracket, the upper roller frame is rotatably supported on the feed bracket, a swinging driving cylinder is arranged between the upper roller frame and the feed bracket, the working surface of the feed rollers is embedded with a wear-resistant block, and the outer surface of the wear-resistant block is positioned on the working surface of, the lower roll frame is supported by a single lifting stud, the ratio D/L of the thread diameter D of the lifting stud to the length L of the working surface of the feeding roll is 0.7-1.5, so that the stability of the support of the upper roll frame can be well guaranteed, the lifting adjustment can be simply realized by rotating an adjusting operation part arranged on a worm, the worm drives a worm wheel to rotate an adjusting nut and enable the lifting stud screwed with the adjusting nut to move up and down, so that the upper and lower height positions of a bar clamped on the feeding roll are adjusted to be aligned and concentric with a pipe shrinking device, the pipe shrinking processing quality is guaranteed, the adjusting process is convenient and rapid, and the flexible transmission connection of the feeding roll and a feeding driving motor which are rotatably supported on the lower roll frame guarantees that the transmission connection of the feeding roll to the feeding roll after the alignment adjustment is not influenced by the coaxiality of the feeding roll and the; the embedded wear-resistant blocks are located on the working surface of the feed roller, the wear-resistant blocks mainly bear contact and friction of the conveyed bar, the wear resistance of the working surface of the feed roller can be greatly improved, abrasion of the feed roller is reduced, change of the center position of the contracted pipe bar caused by abrasion of the feed roller is avoided, the machining quality of contracted pipe is improved, and the service life of the pipe contracting machine is also guaranteed.

The utility model discloses a preferred embodiment, the radial guide slot of die carrier main shaft front end is the cross and distributes, and the radial guide slot internal movable support that is the cross and distributes has two pairs of die reducing. By adopting the embodiment, two pairs of pipe reducing dies are simultaneously carried out in the pipe reducing process, so that the production efficiency is higher.

The utility model discloses a another kind of preferred embodiment, the draw working face of draw die includes the circular cone cambered surface and the cylinder cambered surface that meet around, the circular cone cambered surface is the part side of circular cone hole, and the bottom surface of the circular cone hole at circular cone cambered surface place is located the draw die front end, the cylinder cambered surface is the part side in cylinder hole. By adopting the embodiment, the end part of the bar material is firstly hit by the cone cambered surface at the front end of the pipe reducing working surface in the pipe reducing process, the radial size of the cone cambered surface is large before and small after, the radial size of the end part of the bar material is gradually reduced, and finally, the bar material is hit by the cylinder cambered surface to be formed, so that the whole pipe reducing process is gradual, the deformation is gradually in place, and the pipe reducing effect is better.

In another preferred embodiment of the present invention, the radial distance from the tooth root to the tooth tip of the circular arc tooth on the inner wall of the internal tooth impeller is 5 to 15 mm. By adopting the embodiment, the stroke of the pipe reducing die determined by the radial distance from the tooth root to the tooth top of the circular arc tooth on the inner wall of the inner tooth wave wheel is 5-15 mm, and can adapt to the requirement of the radial size change of the bar material pipe reducing.

The utility model discloses further preferred embodiment, the feed roll of rotation support on the lower roll rack passes through the cardan drive with pay-off driving motor and is connected. By adopting the implementation mode, the transmission requirement of the height position adjustment change of the feeding roller can be met.

The utility model discloses another further preferred embodiment, the lower roll frame includes the lower roll frame bottom plate and links firmly the feed roller bearing frame on the lower roll frame bottom plate, the lift double-screw bolt links firmly in the bottom surface middle part of lower roll frame bottom plate. By adopting the embodiment, the feed roller bearing seat fixedly connected on the bottom plate of the lower roller frame can support the feed roller, and the lifting stud fixedly connected in the middle of the bottom surface of the bottom plate of the lower roller frame provides stable and reliable support for the whole lower roller frame.

The utility model discloses still a further preferred embodiment be equipped with two spacing guide arms between lower roll rack and the pay-off support, spacing guide arm activity is pegged graft on lower roll rack bottom plate, and spacing guide arm lower extreme links firmly on the pay-off support. By adopting the embodiment, the lower roller frame bottom plate can only move up and down relative to the feeding support under the guiding action of the two limiting guide rods, and is limited all around, so that the stability of the lower roller frame position is ensured, the limiting guide rods are movably inserted on the lower roller frame bottom plate, and the lower ends of the limiting guide rods are fixedly connected on the feeding support, so that the lower roller frame bottom plate can be ensured to move up and down relative to the feeding support under the guiding action of the limiting guide rods.

The utility model discloses further preferred embodiment, go up roller frame both ends and be the forked opening, an open end of upper roll frame rotates the supporting and has the feed roll, and another open end of upper roll frame rotates the supporting and has the drive connecting axle, the tailpiece of the piston rod end that the swing drove actuating cylinder links firmly with the drive connecting axle, and the cylinder body hinge that the swing drove actuating cylinder is on the pay-off support. By adopting the embodiment, the upper roll frame can support two ends of the feeding roll, the stability of the support of the feeding roll is ensured, and the driving connecting shaft supported by the two ends is connected with the swinging driving cylinder hinged on the feeding support, so that the connection requirement of the swinging upper roll frame and the swinging driving cylinder can be met, and the upper roll frame can be stressed in a balanced manner and has good stability.

The utility model discloses another further preferred embodiment be equipped with wear-resisting piece mounting groove on the working face of feed roll, the tank bottom surface of wear-resisting piece mounting groove is corresponding with the feed roll working face at this wear-resisting piece mounting groove place, and each wear-resisting piece mounting groove sets up along feed roll axial interval, wear-resisting piece is the square form, and the wear-resisting piece that is the square form inlays in proper order along circumference and adorns in the wear-resisting piece mounting groove. By adopting the embodiment, the wear-resistant blocks positioned in the wear-resistant block mounting grooves arranged at intervals along the axial direction can meet the wear-resistant requirement of the feed roller, the wear-resistant blocks are convenient to embed, the manufacture of the wear-resistant blocks can be facilitated by the square wear-resistant blocks, and the outer surfaces of the wear-resistant blocks can be ensured to be positioned on the working surface of the feed roller.

In a still further preferred embodiment of the present invention, the wear-resistant block is a cemented carbide block. By adopting the embodiment, the hard alloy has a series of excellent performances of high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and the like, particularly high hardness and wear resistance, and basically keeps unchanged even at the temperature of 500 ℃, so that the wear-resistant use requirement of the feed roller can be well met, and the service life is ensured.

Drawings

The high-precision pipe reducing machine of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of a specific embodiment of the high-precision pipe shrinking machine of the present invention;

FIG. 2 is a schematic view of the construction of a tube contracting device of the construction of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the mold section of the arrangement of FIG. 2;

FIG. 4 is a schematic view of the feed assembly of the configuration of FIG. 1;

FIG. 5 is a left side view of FIG. 4;

fig. 6 is an enlarged schematic view of the feed roller in the structure shown in fig. 4.

In the figure: 1-pipe reducing device, 11-main shaft driving wheel, 12-die carrier main shaft, 13-striking block, 14-roller, 15-pipe reducing die, 16-internal tooth wave wheel, 17-pipe reducing device bracket, 18-arc tooth, 19-radial guide groove, 2-feeding driving motor, 3-bar, 4-universal shaft, 5-feeding device and 51-feeding bracket, 52-lower roller frame, 53-worm, 54-adjusting nut, 55-lower roller frame bottom plate, 56-lifting stud, 57-upper roller frame, 58-feeding roller, 59-feeding roller bearing seat, 510-worm gear, 511-limit guide rod, 512-driving connecting shaft, 513-swinging driving cylinder, 514-adjusting operating piece and 515-wear-resisting block.

Detailed Description

In the high-precision pipe reducing machine shown in fig. 1, a feeding device 5 clamps a bar 3 to be subjected to pipe reducing and conveys the bar into a pipe reducing device 1, and the conveying motion of the feeding device 5 is driven by a feeding driving motor 2 through a universal shaft 4.

Referring to fig. 2 and fig. 3, the pipe reducing device 1 comprises a pipe reducing device support 17 and pipe reducing dies 15 arranged in pairs, the opposite surfaces of the two pipe reducing dies 15 arranged in pairs are pipe reducing working surfaces, the pipe reducing working surfaces comprise a conical arc surface and a cylindrical arc surface which are connected in a front-back manner, the conical arc surface is a partial side surface of a conical hole, the bottom surface of the conical hole where the conical arc surface is located is positioned at the front end of the pipe reducing die 15, the cylindrical arc surface is a partial side surface of a cylindrical hole, the pipe reducing dies 15 are movably supported in a radial guide groove 19 at the front end of a die carrier main shaft 12, the radial guide groove 19 at the front end of the die carrier main shaft 12 is distributed in a cross manner, two pairs of pipe reducing dies 15 are movably supported in the radial guide groove 19 distributed in the cross manner, the die carrier main shaft 12 is rotatably supported on the pipe reducing device support 17, a wave wheel 16 is arranged, the inner wall of the inner tooth wave wheel 16 is provided with arc teeth 18 which are evenly distributed along the circumferential direction, the number of the arc teeth 18 is even, the axis of the inner tooth wave wheel 16 is positioned on the central line of the die carrier main shaft 12, the radial distance H from the tooth root to the tooth crest of the arc teeth 18 on the inner wall of the inner tooth wave wheel 16 is 5-15 mm, a striking block 13 is movably supported in a radial guide groove 19 at the front end of the die carrier main shaft 12, the striking block 13 is positioned between a reducing die 15 and an inner tooth impeller 16, a roller 14 is rotatably supported on the striking block 13 at an end opposite to the inner tooth impeller 16, the excircle of the roller 14 is in rolling contact with arc teeth 18 on the inner wall of an inner tooth wave wheel 16, a die carrier main shaft 12 is in transmission connection with a die carrier main shaft driving device through a main shaft driving wheel 11, the die carrier main shaft driving device is a motor (not shown in the figure), the main shaft driving wheel 11 is a belt wheel, and the die carrier main shaft driving device is in transmission connection with the die carrier main shaft 12 through a belt wheel pair.

Referring to fig. 4 and 5, the feeding device 5 includes a feeding bracket 51, an upper feeding roller 58 and a lower feeding roller 58 supported on the feeding bracket 51, the two feeding rollers 58 are respectively rotatably supported on an upper roller frame 57 and a lower roller frame 52, axes of the two feeding rollers 58 are crossed in space and are generally crossed in space vertically, a working surface generatrix of the feeding rollers 58 is a hyperbola, a bar 3 to be contracted is clamped between the upper feeding roller 58 and the lower feeding roller 58, an included angle between the axis of the bar 3 and the axis of the feeding rollers 58 is 45 degrees, the feeding rollers 58 rotatably supported on the lower roller frame 52 are flexibly connected with a feeding driving motor 2 through a universal shaft 4, a lifting stud 56 is arranged at the lower end of the lower roller frame 52, a ratio D/L between a thread diameter D of the lifting stud 56 and a working surface length L of the feeding rollers 58 is 0.7-1.5, the lower roller frame 52 includes a lower roller frame bottom plate 55 and a feeding roller bearing seat 59 fixedly connected on the lower roller frame bottom plate, the feeding roller 58 is supported between two feeding roller bearing blocks 59, the lifting stud 56 is fixedly connected with the middle part of the bottom surface of the bottom plate 55 of the lower roller frame, the lifting stud 56 is rotatably connected with an adjusting nut 54, the adjusting nut 54 is rotatably supported on the feeding bracket 51 through a bearing, the outer circumference of the adjusting nut 54 is provided with a worm wheel 510, a worm 53 meshed with the worm wheel 510 is rotatably supported on the feeding bracket 51, one end of the worm 53 is provided with an adjusting operating part 514, the adjusting operating part 514 is a hand wheel, of course, a handle or other components which are convenient for rotating the worm 53 and have certain force arm are also arranged on the outer circumference of the adjusting nut 54, two limiting guide rods 511 are arranged between the lower roller frame 52 and the feeding bracket 51, the limiting guide rods 511 are movably inserted on the bottom plate 55 of the lower roller frame, and the; an upper roller frame 57 is supported on a feeding support 51 in a swinging manner, two ends of the upper roller frame 57 are opened in a fork shape, a feeding roller 58 is rotatably supported in one opening end of the upper roller frame 57, a driving connecting shaft 512 is rotatably supported in the other opening end of the upper roller frame 57, a swinging driving cylinder 513 is arranged between the upper roller frame 57 and the feeding support 51, a piston rod end of the swinging driving cylinder 513 is fixedly connected with the driving connecting shaft 512, a cylinder body of the swinging driving cylinder 513 is hinged on the feeding support 51, as shown in fig. 6, a wear-resistant block 515 is embedded on a working surface of the feeding roller 58, the outer surface of the wear-resistant block 515 is positioned on the working surface of the feeding roller 58, a wear-resistant block mounting groove is arranged on the working surface of the feeding roller 58, the groove bottom surface of the wear-resistant block mounting groove corresponds to the working surface of the feeding roller 58 where the wear-resistant block mounting groove is positioned, namely the groove bottom, so that the outer surface of the wear-resistant block 515 is positioned on the working surface of the feeding roller 58 after the wear-resistant block 515 is embedded, the wear-resistant block mounting grooves are arranged at intervals along the axial direction of the feeding roller 58, the wear-resistant block 515 is a diamond-shaped hard alloy block, and the diamond-shaped wear-resistant block 515 is sequentially embedded in the wear-resistant block mounting grooves along the circumferential direction.

The above description has been presented only for the purpose of illustrating certain preferred embodiments of the invention, and it is not to be taken as a limitation on the invention, as many modifications and variations are possible. For example, the die carrier main shaft driving device can be in transmission connection with the die carrier main shaft 12 not through a belt wheel pair, but through a chain transmission pair; the feed roller 58 rotatably supported on the lower roller frame 52 and the feed driving motor 2 may be flexibly connected through a belt transmission pair or a chain transmission pair instead of the universal shaft 4. Therefore, any improvement and changes made on the basis of the basic principle of the present invention should be considered as falling within the protection scope of the present invention.

Claims (10)

1. The utility model provides a high accuracy pipe reducing machine, includes pipe reducing device (1) and material feeding unit (5), pipe reducing device (1) is including reducing pipe device support (17) and reducing pipe mould (15) that set up in pairs, and the relative surface is the working face of reducing pipe on two reducing pipe moulds (15) that set up in pairs, material feeding unit (5) are including pay-off support (51), two upper and lower feed rolls (58) of support on pay-off support (51), and the axis space of two feed rolls (58) is alternately, and the working face generating line of feed roll (58) is the hyperbola, its characterized in that: the pipe reducing die (15) is movably supported in a radial guide groove (19) at the front end of the die set main shaft (12), the die set main shaft (12) is rotatably supported on a pipe reducing device support (17), an internal tooth impeller (16) is arranged on the periphery of the front end of the die set main shaft (12), the internal tooth impeller (16) is fixedly connected on the pipe reducing device support (17), circular arc teeth (18) uniformly distributed along the circumferential direction are arranged on the inner wall of the internal tooth impeller (16), the number of the circular arc teeth (18) is even, and the axis of the internal tooth impeller (16) is positioned on the central line of the die set main shaft (12); a striking block (13) is movably supported in a radial guide groove (19) at the front end of the die carrier main shaft (12), the striking block (13) is positioned between a reducing die (15) and an inner tooth impeller (16), a roller (14) is rotatably supported at one end of the striking block (13) opposite to the inner tooth impeller (16), the excircle of the roller (14) is in rolling contact with an arc tooth (18) on the inner wall of the inner tooth impeller (16), and the die carrier main shaft (12) is in transmission connection with a die carrier main shaft driving device through a main shaft driving wheel (11); the two feeding rollers (58) are respectively rotatably supported on an upper roller frame (57) and a lower roller frame (52), the feeding rollers (58) rotatably supported on the lower roller frame (52) are in flexible transmission connection with a feeding driving motor (2), a lifting stud (56) is arranged at the lower end of the lower roller frame (52), the ratio D/L of the thread diameter D of the lifting stud (56) to the working surface length L of the feeding rollers (58) is 0.7-1.5, an adjusting nut (54) is rotatably connected onto the lifting stud (56), the adjusting nut (54) is rotatably supported on a feeding bracket (51), a worm wheel (510) is arranged on the outer circumference of the adjusting nut (54), a worm (53) meshed with the worm wheel (510) is rotatably supported on the feeding bracket (51), an adjusting operation part (514) is arranged at one end of the worm (53), and a limit guide rod (511) is arranged between the lower roller frame (52) and the feeding bracket (51), the upper roller frame (57) is supported on the feeding support (51) in a swinging mode, a swinging driving air cylinder (513) is arranged between the upper roller frame (57) and the feeding support (51), a wear-resistant block (515) is embedded on the working surface of the feeding roller (58), and the outer surface of the wear-resistant block (515) is located on the working surface of the feeding roller (58).

2. The high-precision pipe reduction machine according to claim 1, wherein: the radial guide groove (19) at the front end of the die carrier main shaft (12) is distributed in a cross shape, and two pairs of die reducing dies (15) are movably supported in the radial guide groove (19) distributed in the cross shape.

3. The high-precision pipe reduction machine according to claim 1, wherein: the pipe reducing working surface of the pipe reducing die (15) comprises a conical cambered surface and a cylindrical cambered surface which are connected in front and back, the conical cambered surface is a part of the side surface of a conical hole, the bottom surface of the conical hole where the conical cambered surface is located at the front end of the pipe reducing die (15), and the cylindrical cambered surface is a part of the side surface of a cylindrical hole.

4. The high-precision pipe reduction machine according to claim 1, wherein: the radial distance H from the tooth root to the tooth top of the circular arc teeth (18) on the inner wall of the inner tooth impeller (16) is 5-15 mm.

5. The high-precision pipe reduction machine according to claim 1, wherein: the feeding roller (58) which is rotatably supported on the lower roller frame (52) is in transmission connection with the feeding driving motor (2) through a universal shaft (4).

6. The high-precision pipe reduction machine according to claim 1, wherein: the lower roller frame (52) comprises a lower roller frame bottom plate (55) and a feeding roller bearing seat (59) fixedly connected to the lower roller frame bottom plate (55), and the lifting stud (56) is fixedly connected to the middle of the bottom surface of the lower roller frame bottom plate (55).

7. The high-precision pipe reduction machine according to claim 6, wherein: two limiting guide rods (511) are arranged between the lower roller frame (52) and the feeding support (51), the limiting guide rods (511) are movably inserted on the lower roller frame bottom plate (55), and the lower ends of the limiting guide rods (511) are fixedly connected on the feeding support (51).

8. The high-precision pipe reduction machine according to claim 1, wherein: the two ends of the upper roller frame (57) are forked openings, one opening end of the upper roller frame (57) rotatably supports the feeding roller (58), the other opening end of the upper roller frame (57) rotatably supports the driving connecting shaft (512), the piston rod end of the swing driving cylinder (513) is fixedly connected with the driving connecting shaft (512), and the cylinder body of the swing driving cylinder (513) is hinged to the feeding support (51).

9. The high-precision pipe reduction machine according to claim 1, wherein: wear-resistant block mounting grooves are formed in the working surface of the feeding roller (58), the bottom surfaces of the wear-resistant block mounting grooves correspond to the working surface of the feeding roller (58) where the wear-resistant block mounting grooves are formed, the wear-resistant block mounting grooves are arranged at intervals along the axial direction of the feeding roller (58), the wear-resistant blocks (515) are square blocks, and the square blocks of the wear-resistant blocks (515) are sequentially embedded in the wear-resistant block mounting grooves along the circumferential direction.

10. The high precision pipe reduction machine according to claim 1 or 9, wherein: the wear-resistant block (515) is a hard alloy block.

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