CN111659742A - Steel pipe clamping anti-skidding rigid support method and clamp for small cold-drawing three-way machine - Google Patents

Abstract

A steel tube clamping anti-skid rigid supporting method and a clamp for a small cold-drawing three-way machine are disclosed, wherein a half clamp clamps a steel tube (C) in a surrounding manner by a clamping inner hole (D) and is provided with a 100% surrounding clamping structure for the steel tube (C); the half clamp realizes the multi-directional control composite plane positioning of the three-way machine support plate (1) and the steel pipe (C) by controlling a support surface (E), an axial upper vertical surface (F), a pipe side vertical surface (G), an axial bottom vertical surface (H) and a bottom side clamping vertical surface (P) of the half clamp, and realizes the plane support by contacting the top support surface (E) of the half clamp with the bottom plane of the three-way machine support plate (1) and the bottom plane (S) of the connecting plate; and a bottom clamping force is applied in conjunction with the vise. The combined rigid structure provides a contact surface for clamping and wrapping the periphery of the outer wall of the steel pipe, the rigidity of the clamp clamping structure is effectively improved, the clamp clamping structure has a 100% periphery clamping structure for the steel pipe C, the position of the tee joint machine is accurately kept stable during machining, the yield of the cold-drawn tee joint is 100%, and the clamp clamping structure is particularly suitable for machining the cold-drawn tee joint with medium and small calibers and high precision.

Description

Steel pipe clamping anti-skidding rigid support method and clamp for small cold-drawing three-way machine

Technical Field

The invention belongs to the technology of manufacturing a metal pipe by a drawing mode without cutting in IPC classification B21C1/00, in particular to a steel pipe clamping method and a clamp technology thereof, and particularly relates to a steel pipe clamping anti-skidding rigid support method and a clamp of a small cold-drawing three-way machine.

Background

A portable cold-drawing three-way machine, called three-way machine for short, is an electric tool for drawing three-way pipes from thin-wall steel pipes with the wall thickness less than 2mm in small batches, and can work only after the three-way machine is effectively connected, fixed and clamped with the steel pipes through a supporting plate and a steel pipe clamping fixture.

The prior related published patent documents are less.

The technical scheme is that a support plate is provided with a plurality of fixing devices, and each fixing device comprises a first hoop fixed with the support plate and a second hoop hinged with the first hoop; the other end of pin joint is kept away from to first hoop and second hoop is provided with the lock solid subassembly, and the lock solid subassembly includes locking closure, annular hasp and latch hook, and the locking closure rotates to set up the tip of keeping away from the pin joint at first hoop, and the latch hook is fixed at the tip of keeping away from the pin joint at second hoop, and the one end of annular hasp and the inside wall below of locking closure are articulated, and the other end can inlay inside the latch hook. The effect of improving the stability of the pipe fitting during cold drawing is achieved by utilizing the clamping force between the annular lock catch and the lock hook.

The existing connecting and clamping method of the support plate and the steel pipe of the three-way machine mainly comprises two methods, namely:

the first is a chain method: the method is mainly adopted by the conventional portable three-way machine equipment, has a wide applicable pipe diameter range, and can realize the connection and clamping of any pipe diameter within the range except for poor effect on the small-pipe-diameter steel pipe.

The second is a tube clamping method: the pipe clamp clamping method mainly comprises two connecting plates which are arranged at two axial ends of a supporting plate on a steel pipe in a clamping seat, and pipe clamp half flanges which are arranged on the outer sides of the two connecting plates and used for clamping the steel pipe, the connecting plates and the supporting plate, wherein a pair of special clamps are required to be specially matched for each steel pipe with the pipe diameter. Half is the Chinese name of 'half' transliteration, and refers to a combination of a whole circular part after being split into two parts, or a male die and a female die structure, and mainly refers to a split structure in engineering. The half shaft sleeve is characterized by being in various forms, such as a half joint, a half sleeve, a half bearing, a half nut, a half flange and the like.

In the existing chain method, due to the inherent flexibility characteristic of a chain structure, when the reaction force is large, the clamping force is insufficient in the application process, and the stability is poor. And in the pipe clamp method, this kind of ha fu pipe clamp is though aiming at realizing rigid pipe clamp structure, but because, frock integrated configuration only has the local pipe clamp position in backup pad both ends to the steel pipe centre gripping, and the hoop effective contact is less than 30%, and the backup pad only has the V type structure through the bottom directly to contact the joint with the steel pipe, and the little rigidity of area of contact is poor, and simultaneously, this kind of anchor clamps clamping-force can not be too big, otherwise steel pipe C can be become by the pressure, equally there is the clamp force not enough, centre gripping length is long, poor stability's defect.

In summary, the drawbacks of the prior methods also include:

1) easy sliding: after the support plate is fixed and clamped on the steel pipe through a chain or a half pipe clamp, when the tee joint machine is placed on the support plate to work, the axial position and the circumferential position of the tee joint machine are deviated, and the position precision is insufficient, because the reaction force of drilling, pulling and milling is large, the clamping force of the two methods is small, the generated friction force is limited, the support plate can slide on the steel pipe in the axial direction and the circumferential direction, so that the working position of the tee joint machine is changed;

2) poor rigidity: due to the flexible connection of the chains and the structure of the half pipe clamp, the rigidity of the two methods is poor, when the tee joint machine works, the support plate can drive the hole-drawing machine to twist, so that the size and the shape of the drawn tee joint branch pipe exceed the deviation requirement, and the end surface of the milled branch pipe is uneven, which is not beneficial to the subsequent procedure, namely welding;

3) limitation: the two existing methods are only suitable for pipelines with straight pipes of certain length on both sides of the position for drawing the three-way branch pipe, are not suitable for the condition that the branch pipes 5 with different calibers are staggered and densely distributed on the main pipe 5 as shown in figure 1, and are also not suitable for the position of the branch pipe at the bent pipe or the position close to the bent pipe as shown in figure 2, and the existing methods can not realize the cold-drawing three-way processing operation of the structures.

Disclosure of Invention

The invention aims to provide a rigid anti-skidding steel pipe clamping support method and a rigid anti-skidding steel pipe clamping support clamp for a small cold-drawing three-way machine, which are used for eliminating the defects of position size out-of-tolerance, three-way branch pipe deformation and branch pipe axial cracking caused by steel pipe distortion and three-way machine shaking.

The aim of the invention is achieved by the following technical measures: the half clamp comprises two half single bodies axially horizontally opening the pipe grooves at the middle upper parts of the inner side surfaces which are in opposite contact, and the two half single bodies are closed to form a circular pipe-shaped clamping inner hole after being oppositely installed; moreover, the two half single bodies are connected into a whole at the lower part through a clamping screw; a supporting and positioning table is convexly arranged at the middle part of the upper side of the half clamp, an operating hole is concavely arranged at the middle part of the top surface of the supporting and positioning table, the middle part of the operating hole is further reduced in diameter and concavely provided with a branch pipe generating hole communicated with the clamping inner hole, and the branch pipe generating hole is coaxial with the operating hole; the outer edge of the outer wall of the middle upper part of the half clamp protrudes towards four corners, the top surface of the half clamp forms a supporting surface, mounting holes are respectively formed downwards at the corner parts, at least one side of the middle part of at least one end of the half clamp in the axial direction of a clamping inner hole is inwards provided with an inclined guide fan-shaped notch, in addition, the vertical surfaces of the supporting and positioning tables in the axial direction of the outer walls at the two axial ends of the clamping inner hole are mutually parallel, and the vertical surfaces of the supporting and positioning tables in the pipe side of the outer walls at the two sides; the lower part of the half clamp is parallel to two axial outer sides of a clamping inner hole and is provided with vertical bottom clamping vertical surfaces which are parallel to each other; the downward extending section of the vertical line passing through the gravity center of the half clamp is vertical to the horizontal plane of the lower part of the half clamp passing through the clamping screw, and the clamping screw takes the vertical line as a symmetry axis; the half surface of the half clamp is a geometric symmetry surface of the tee joint, namely a plane where the main pipe of the tee joint and the axis of the branch pipe are located, and the two half clamps are connected together in a balanced mode through at least two clamping screws; the connecting plates are connected with a support plate of the three-way machine and a half clamp, 2 connecting plates are fixed on two axial outer sides of the support plate of the three-way machine in a bridging manner, and each connecting plate is fixedly connected with two axial outer end faces of the half clamp through a group of 2-4 connecting screws; the inner wall of at least one end of the half clamp is outwards inclined to form a guide structure; the clamping inner hole encircles and clamps the steel pipe, and the clamping inner hole has a 100% circumference clamping structure for the steel pipe; the half clamp realizes the multi-directional control composite plane positioning of the support plate of the three-way machine and the steel pipe to rigidly support the support plate of the three-way machine by controlling the support surface, the axial upper vertical surface, the pipe side vertical surface, the axial bottom vertical surface and the bottom clamping vertical surface, and simultaneously realizes the plane support by contacting the support surface at the top of the half clamp with the bottom plane of the support plate of the three-way machine and the bottom plane of the connecting plate; and a bottom clamping force is applied in conjunction with a pneumatic, hydraulic or manual vise.

In particular, the inner wall surface of the clamping inner hole is provided with a rough surface structure or an anti-slip groove.

Particularly, the middle part of the bottom side of the connecting plate is provided with an upper concave angle groove, and the connecting plate is provided with at least two horizontal mounting holes for fixing a support plate of the three-way machine.

Particularly, the central axis of the clamping inner hole is lower than the supporting surface, the top surface of the clamping inner hole is lower than the bottom end of the operation hole in the middle of the supporting and positioning table, and the circumferential inner wall of the clamping inner hole beside the branch pipe generation hole of the supporting and positioning table is closed.

Particularly, the distance between the side vertical surfaces of the two side pipes is larger than that between the bottom clamping vertical surfaces of the two outer sides on the two outer sides parallel to the axial direction of the clamping inner hole; the distance between the two outer ends along the axial direction of the clamping inner hole and the inner ends of the two fan-shaped notches is aligned with the outer wall of the tee machine supporting plate on the same side; along the axial direction of the clamping inner hole, the distance between the two outer ends and the vertical surface on the two opposite axial directions is smaller than the distance between the two vertical surfaces on the bottom of the two axial directions.

Particularly, the half clamp is a symmetrical bilateral clamping half clamp and comprises two completely symmetrical half monomers with axially horizontal pipe grooves at the middle upper parts of the inner side surfaces in opposite contact, direct connecting plates positioned at the outer sides of the two axial ends of the symmetrical bilateral clamping half clamp are respectively and vertically installed in the axial direction of a clamping inner hole, two ends of the direct connecting plates are provided with vertical installation holes, and the direct connecting plates are respectively fixed on the installation holes at the corners of the symmetrical bilateral clamping half clamp in a penetrating way through connecting screws; a pair of clamping screws are evenly arranged at the lower part of the symmetrical double-side clamping half clamp, and the branch pipe generation hole and the lower section of the central axis of the operation hole are positioned between the clamping screws.

Particularly, the half clamp is a single-side clamping half clamp for the bent pipe and comprises two half single bodies, the two half single bodies are completely symmetrical in structure from a branch pipe generation hole to a part from the center axis of the operation hole to the front end along the axial direction of a clamping inner hole, and a direct connection plate is bridged between the front ends of the two half single bodies and between the supporting and positioning table and the arc-shaped guide angle table; the outer end of the upper part of at least one half single body part structure is provided with an arc guide angle platform, the inner side edge of the arc guide angle platform is provided with a fan-shaped gap Q structure and an arc curved surface which is in tangential smooth transition with a clamping inner hole, correspondingly, a special-shaped connecting plate is bridged between the rear ends of the two half single bodies and at the rear side of the supporting and positioning platform, and the horizontal projection structure of the special-shaped connecting plate is in a U shape, an arc shape or a curved ruler shape; a balance block is arranged on the upper part of the front end of the pipe bending unilateral clamping half clamp in a protruding mode, the height of the balance block is the same as that of the supporting and positioning table, a pair of clamping screws horizontally penetrate through the lower part of the pipe bending unilateral clamping half clamp, and the vertical face of the symmetrical shaft of the pair of clamping screws is positioned on the outer side of the outer wall of the front end of the supporting and positioning table; and the lower section of the central axis of the branch pipe generation hole and the operating hole is positioned outside one side of the rear part of the pair of clamping screws deviated from the mounting special-shaped connecting plate.

The invention has the advantages and effects that: the combined rigid structure provides a contact surface for clamping and wrapping the periphery of the outer wall of the steel pipe, the combined rigid structure has a 100% periphery clamping structure for the steel pipe, the rigidity of the clamping structure of the clamp is effectively improved, the friction clamping force between the clamp and the steel pipe is remarkably increased, the position of the tee joint machine during machining is accurately kept stable, the rigidity of the steel pipe is protected, the steel pipe is prevented from deforming during machining, the clamp and the sliding tee joint machine of the steel pipe are prevented from shaking during machining, necessary conditions are provided for achieving the yield of the cold-drawn tee joint to be 100%, and the combined rigid structure is particularly suitable for machining of the cold-drawn.

Drawings

FIG. 1 is a schematic view of a pipeline structure with limited lengths of straight pipes on two sides of a position for pulling out a three-way branch pipe.

Fig. 2 is a schematic diagram of a three-way structure with branch pipes located at or near the bend.

Fig. 3 is a schematic front view of a symmetrical double-side clamping huff clamp for clamping a steel pipe and connecting a support plate of a three-way machine in embodiment 1 of the invention.

FIG. 4 is a schematic structural view of the steel pipe of FIG. 3 viewed from the axial direction.

Fig. 5 is a schematic top view of fig. 3.

Fig. 6 is a schematic front view of a symmetric double-side clamping huff clamp in embodiment 1 of the invention.

FIG. 7 is a schematic structural view of the steel pipe of FIG. 6 viewed in side elevation along the axial direction of the steel pipe.

Fig. 8 is a schematic top view of the structure of fig. 6.

Fig. 9 is a schematic view of a clamping inner hole of a symmetric double-side clamping huff clamp for clamping a steel pipe in embodiment 1 of the invention.

Fig. 10 is a schematic front view of a half clamp for clamping a bent pipe at one side in embodiment 2 of the present invention.

FIG. 11 is a schematic structural view of FIG. 10 viewed in side elevation along the axial direction of the steel pipe.

Fig. 12 is a schematic top view of fig. 10.

Fig. 13 is a schematic top view of the special-shaped connecting plate in embodiment 2 of the present invention.

Fig. 14 is a schematic structural diagram of a special-shaped connecting plate in a front view in embodiment 2 of the present invention.

The reference numerals include:

the three-way machine comprises a support plate 1, a straight connecting plate 21, a special-shaped connecting plate 22, a main pipe 4, a branch pipe 5, a symmetrical double-side clamping half clamp 61, a bent pipe single-side clamping half clamp 62, a support positioning table 601, an arc-shaped guide angle table 622, a bench vice 7, a half surface A, a clamping screw B, a steel pipe C, a clamping inner hole D, a support surface E, an axial upper vertical surface F, a pipe side vertical surface G, an axial bottom vertical surface H, a branch pipe generation hole J, an installation hole K, an operation hole L, a bottom side clamping vertical surface P, a fan-shaped notch Q, a bottom plane S, a connecting screw T and a balance block U.

Detailed Description

The principle of the invention lies in that aiming at the defects of the prior method, a half clamp and a connecting plate are innovatively designed, a clamping screw B and a connecting screw T are fastened and rigidly connected with a support plate 1 of the three-way machine into a whole, a steel pipe C is clamped by an inner clamping hole D in an encircling manner, the effective contact area is increased, a 100 percent surrounding clamping structure for the steel pipe C is provided, and the surface friction coefficient is increased by an anti-skid structure and surface roughness of the inner clamping hole D; the steel pipe is ensured not to deform under the condition of increasing the clamping force, so that the contact pressure of the steel pipe C and the clamping inner hole D is improved by increasing the clamping force, and the friction force is increased; the clamping force is effectively increased while the unilateral clamping can be realized by realizing the planar positioning of the half clamp and supporting the support plate 1 of the three-way machine and combining the method of increasing the clamping force by a pneumatic, hydraulic or manual bench vice 7, the range of applicable pipeline structures is enlarged, and the problems of insufficient position precision caused by the sliding between the clamp and a steel pipe and the size over-tolerance of a branch pipe caused by poor rigidity are solved.

In the invention, the half clamp has good strength, rigidity and surface hardness so as to keep the steel pipe C not to deform and keep the stability of the tee support plate 1 when the tee is cold-drawn to work; the connecting plate has good strength, rigidity and surface hardness, is fixed at two axial ends of the support plate 1 of the three-way machine, and connects the support plate 1 of the three-way machine with the half clamp through 4 connecting screws T.

In the invention, the downward extending section of the vertical line passing through the gravity center of the half clamp is vertical to the horizontal plane passing through the clamping screw B at the lower part of the half clamp, and the clamping screw B takes the vertical line as a symmetry axis.

According to the invention, a half surface A of a half clamp is a geometric symmetry surface of a tee joint, namely a plane where the axes of a main pipe 4 and a branch pipe 5 of the tee joint are located, the two half clamps are uniformly connected together by adopting at least two clamping screws B, the clamping screws B play roles of guiding, temporarily clamping and limiting at the same time, and the steel pipe C is loosened and clamped by loosening and tightening the clamping screws B; the two half clamps in the same group clamp the transverse clamping inner hole D in the middle of the involution surface to clamp the surface of the steel pipe C which is close to 80 percent of the two sides of the center of the branch pipe 5 in an encircling way, so that the steel pipe C is supported in all directions during drilling, pipe drawing and milling, and the deformation is reduced; the contact area is increased so that the steel pipe C is not deformed in the case of increasing the clamping force using a vise or the like; and the anti-slip design of the surface roughness of the inner wall of the clamping inner hole D, the anti-slip grooves and the like is combined, so that the friction force between the Ha method clamp and the outer wall of the steel pipe C is further increased, and the sliding and the rotation between the Ha method clamp and the steel pipe C are avoided.

In the invention, the multidirectional control plane positioning of the support plate 1 of the three-way machine and the steel pipe C is realized by controlling the support surface E of the half clamp, the axial upper vertical surface F, the pipe side vertical surface G, the axial bottom vertical surface H and the bottom clamping vertical surface P. The bottom plane of the support plate 1 of the three-way machine and the bottom plane S of the connecting plate are in contact with the support surface E at the top of the half clamp, so that plane support is realized, the connection rigidity is improved, the V-shaped structure at the bottom of the support plate is not in contact with the steel pipe C, and the contact area of the support plate 1 of the three-way machine is effectively increased by 20 times through the half clamp; the outer vertical surfaces of two sides of the lower part of the half clamp, namely the positioning surfaces of the axial bottom vertical surface H at the axial position of the steel pipe C ensure the fixed position size of the half clamp; the vertical surface of the outer wall of the supporting and positioning table 601 protruding from the upper part of the half clamp, namely the axial upper vertical surface F, is an axial positioning surface of the support plate 1 of the three-way machine, so that the position precision of the support plate 1 of the three-way machine is ensured; moreover, the axial upper vertical surface F and the axial bottom vertical surface H jointly ensure the axial position tolerance of the branch pipe 5; a pipe side elevation G is arranged on the outer wall of the outer convex edge of the middle upper part of the support plate 1 parallel to the middle part of the clamping inner hole D and is a positioning surface in the other direction of the support plate 1, so that the symmetry of the branch pipe 5 relative to the center of the main pipe 4 is ensured; meanwhile, the pipe side elevation G is also a reference surface when the clamp is positioned in the circumferential direction of the branch pipes 5, and circumferential angle relation between each branch pipe 5 or other structures of the steel pipe C is guaranteed.

According to the invention, the half clamp is fixedly connected with the support plate 1 of the three-way machine through 4 threaded mounting holes K distributed at four corners by a group of connecting screws T, so that four holes are fixed to ensure the connection strength; meanwhile, after the half clamp is clamped and fixed on the steel pipe C through the clamping screw B with the lower part transversely penetrated and connected, the assembled half clamp can be placed on a bench vice to clamp the bottom side clamping plane P relatively, so that higher gain clamping force and friction force are provided for the half clamp, and the half clamp and the steel pipe C are ensured not to slide or rotate.

In the invention, a branch pipe generation hole J in the middle of the half clamp reserves a space for pulling the branch pipe 5, and the branch pipe generation hole J can simultaneously contain a small amount of processing scrap iron; the branch pipe generation hole J is slightly larger than the outer diameter of the steel pipe C, so that more contact surfaces are ensured between the clamping inner hole D and the steel pipe C, the steel pipe C is effectively supported, and clamping deformation and machining deformation of the steel pipe C in the machining process are prevented; the operation hole L on the top periphery of the branch pipe generation hole J in the middle of the half clamp provides a space for the rotation of the cutter, and can accommodate a small amount of processing scrap iron.

In the invention, on the premise of still keeping the width of the half clamp consistent with that of the support plate 1 of the three-way machine, the inner wall of at least one end of the half clamp is outwards inclined to form a guide structure, the requirement on the length of the main pipe 4 on two sides of the branch pipe 5 during processing is also reduced, and the axial minimum clamping length is obviously reduced by more than 30%. The guide design solves the application problems of the cold drawing of the pipe end of the bent pipe-shaped main pipe 4 to process the three-way branch pipe 5 and the situation that the space on the two sides of the cold drawing position of the branch pipe 5 is smaller.

In the invention, a connecting plate is connected with a support plate 1 of the three-way machine and a half clamp, 2 connecting plates are fixed on two axial outer sides of the support plate 1 of the three-way machine in a bridging manner, and each connecting plate is fixedly connected with two axial outer end faces of the half clamp through a group of 2-4 connecting screws T.

In the invention, the central axis of a clamping inner hole D is lower than a support surface E of a half fixture, the top surface of the clamping inner hole D is lower than the bottom end of an operation hole L in the middle of a support positioning table 601 at the top of the half fixture, and the circumferential inner wall of the clamping inner hole D beside a branch pipe generation hole J of the support positioning table 601 is closed. Namely, the half clamp has a 100% circumferential clamping structure for the steel pipe C.

According to the half clamp, on the premise of ensuring the strength and the rigidity, a plurality of positions of the whole half clamp are hollowed out, so that the whole weight is reduced, and the half clamp is convenient to carry, clamp and the like.

The invention is further illustrated by the following figures and examples.

Example 1: as shown in fig. 3, 4, 5, 6, 7 and 8, a pair of symmetrical double-side clamping huff clamps 61 comprises two completely symmetrical huff monomers axially horizontally opening pipe slots at the middle upper parts of the inner side surfaces in opposite contact, and the two huff monomers are closed to form a circular pipe-shaped clamping inner hole D after being oppositely mounted; moreover, the two half single bodies are connected into a whole at the lower part through a clamping screw B; a supporting and positioning table 601 is convexly arranged in the middle of the upper side of the symmetrical double-side clamping huff clamp 61, an operating hole L is concavely arranged in the middle of the top surface of the supporting and positioning table 601, a branch pipe generating hole J communicated with the clamping inner hole D is further reduced in diameter in the middle of the operating hole L, and the branch pipe generating hole J is coaxial with the operating hole L; the outer edge of the outer wall of the middle upper part of the symmetrical double-side clamping huff clamp 61 protrudes towards four corners, the top surface of the symmetrical double-side clamping huff clamp forms a supporting surface E, mounting holes K are respectively formed downwards at the corners, at least one side of the middle part of at least one end of the symmetrical double-side clamping huff clamp 61 is inwards provided with an inclined guide fan-shaped notch Q in the axial direction of a clamping inner hole D, vertical surfaces F of the supporting and positioning table 601 in the axial direction of the outer wall of two ends of the clamping inner hole D in the axial direction are mutually parallel, and pipe side vertical surfaces G of the supporting and positioning table 601 on the; the lower part of the symmetrical double-side clamping half clamp 61 is parallel to two axial outer sides of a clamping inner hole D and is provided with vertical bottom side clamping vertical faces P which are parallel to each other; the straight connecting plates 21 positioned at the outer sides of the two axial ends of the symmetrical bilateral clamping half clamp 61 are respectively and axially mounted perpendicular to the clamping inner holes D, the two ends of the straight connecting plates 21 are provided with vertical mounting holes, and the straight connecting plates 21 are respectively fixed on the mounting holes K at the corners of the symmetrical bilateral clamping half clamp 61 in a cross-connection mode through connecting screws T.

In the foregoing, the straight connection plate 21 has at least two horizontal mounting holes. Through the group of horizontal mounting holes, the straight connecting plate 21 and the three-way machine supporting plate 1 are fixedly connected along two axial outer vertical surfaces of the clamping inner hole D.

In the above, the distance between the side vertical surfaces G of the two side pipes is greater than the distance between the bottom clamping vertical surfaces P of the two outer sides on the two outer sides parallel to the axial direction of the clamping inner hole D.

In the above, the distance between the two outer ends along the axial direction of the clamping inner hole D and the inner ends of the two fan-shaped notches Q is aligned with the outer wall of the tee joint machine supporting plate 1 on the same side.

In the above, along the axial direction of the clamping inner hole D, the distance between the two outer ends and the vertical surface F in the two axial directions is smaller than the distance between the two vertical surfaces H in the two axial directions.

In the above, the middle of the bottom side of the straight connecting plate 21 has an upwardly concave angular groove. In use the corner groove is adapted to receive a two sided monomer press-clamped on top of the steel pipe C and bridging the symmetrical double sided clamp half clamp 61.

In the above, the lower part of the symmetric double-side clamping huff clamp 61 is uniformly provided with a pair of clamping screws B, and the lower section of the central axis of the branch pipe generation hole J and the operation hole L is positioned between the clamping screws B.

In the embodiment of the invention, after a pair of symmetrical double-side clamping half clamps 61 are assembled, fan-shaped notch Q structures are respectively designed at the middle parts of two axial ends; the fan-shaped gap Q reduces the requirement on the clamping length of the straight pipes 4 on two sides of the branch pipe 5 during processing, and the straight connecting plates 21 are respectively connected with the outer edges of the axial direction in a compression mode, so that the symmetrical double-side clamping half clamp 61 and the three-way machine supporting plate 1 form the specified rigid structure width and length suitable for the cold drawing three-way machine to work, a larger clamping contact surface is realized, further, on the basis of reaching the enough minimum clamping length, the fan-shaped gap Q belongs to a gap structure, and the whole weight of the symmetrical double-side clamping half clamp 61 is also reduced.

In the embodiment of the invention, when part of the steel pipes C to be processed are abnormal conditions such as bent pipes or reducing pipes, the bent pipe part beside the part to be cold-drawn is suitable for being placed in the fan-shaped notch Q.

In the embodiment of the invention, the operation process is as follows:

(1) installing a steel pipe C; screwing out 2 clamping screws B from the lower part of a pair of prepared symmetrical double-side clamping half clamps 61, but not screwing out all the clamping screws B, pulling the symmetrical double-side clamping half clamps 61 outwards, putting a steel pipe C into a clamping inner hole D from the upper part downwards as long as an opening above the symmetrical double-side clamping half clamps 61 can put down the steel pipe C, and allowing a shorter straight steel pipe to penetrate into the clamping inner hole D of the symmetrical double-side clamping half clamps 61 which are not completely opened;

(2) fixedly and symmetrically clamping the half clamp 61 at two sides; determining the axial position and the circumferential direction of the symmetrical double-side clamping huff clamp 61 on the steel pipe C, aligning a branch pipe generation hole J and an operation hole L of the symmetrical double-side clamping huff clamp 61 with the calibration positions of the three-way branch pipe 5 to be cold-drawn on the steel pipe C, tightening a clamping screw B after the axial bottom elevation H and the pipe side elevation G of the symmetrical double-side clamping huff clamp 61 play a positioning role, and fixing the symmetrical double-side clamping huff clamp 61 on the steel pipe C;

(3) clamping the symmetrical double-side clamping half clamp 61; putting the bottom side clamping vertical face P of the symmetrical double-side clamping half clamp 61 into a clamping opening of the bench vice 7 together with the steel pipe C, tightening the bench vice 7 and clamping the symmetrical double-side clamping half clamp 61;

(4) mounting a support plate 1 of the three-way machine; placing a support plate 1 of the three-way machine on a symmetrical bilateral clamping half clamp 61, butting a bottom surface structure in the middle of the support plate 1 of the three-way machine with a support positioning table 601 in the middle of the upper side of the symmetrical bilateral clamping half clamp 61, then respectively installing a direct connection plate 21 outside two axial end surfaces of the support plate 1 of the three-way machine, selecting a pipe side elevation G and an axial bottom elevation H for positioning, respectively aligning screw holes at two ends of the direct connection plate 21 with mounting holes K at the corners of the symmetrical bilateral clamping half clamp 61, and inserting and tightening 4 connecting screws T to complete rigid mounting and fixing of the support plate 1 of the three-way machine on the symmetrical bilateral clamping half clamp 61 through the direct connection plate 21;

(5) a cold-drawing tee joint machine is arranged through a tee joint machine supporting plate 1 to finish the cold-drawing tee joint operation;

(6) after the cold drawing tee joint operation is completed, the straight connecting plate 21, the tee joint machine supporting plate 1 and the double-side clamping half clamp 61 are separated, and the processed steel pipe C is taken down according to the reverse sequence.

Example 2: when only one side of the three-way branch pipe 5 has enough clamping length, a single-side clamping structure can be adopted, and the other side can effectively clamp the part with insufficient length or interference with the bent pipe structure of the steel pipe to carry out adaptive structural design. As shown in fig. 10, 11, 12, 13 and 14, correspondingly, the profiled connecting plate 22 of the profiled structure is arranged on the one-side clamping structure and the other-side adaptive structure.

In the foregoing, the half clamp 62 for clamping one side of one pair of bent pipes includes two half single bodies, the two half single bodies axially horizontally open pipe grooves in the middle upper parts of the inner side surfaces in opposite contact, and the two half single bodies close and install the two pipe grooves to form a circular pipe-shaped clamping inner hole D; the upper sides of the middle parts of the two half single bodies are provided with supporting and positioning platforms 601 in a protruding mode, the middle parts of the top surfaces of the supporting and positioning platforms 601 are provided with operating holes L in a concave mode, the middle parts of the operating holes L are further provided with branch pipe generating holes J in a diameter reducing and concave mode, the branch pipe generating holes J are communicated with the clamping inner holes D, and the branch pipe generating holes J are coaxial with the operating holes L; along the axial direction of the clamping inner hole D, the two half single bodies are completely symmetrical in structure from the central axis of the branch pipe generation hole J and the central axis of the operating hole L to the front end, and a direct connection plate 21 is bridged between the front ends of the two half single bodies and between the supporting and positioning table 601 and the arc-shaped guide angle table 622; the partial structure from the center axis of the branch pipe generation hole J and the operation hole L to the other rear end, the outer end of the upper part in the partial structure of at least one half single body is provided with an arc guide angle platform 622, the inner side edge of the arc guide angle platform 622 not only has a fan-shaped gap Q structure, but also has an arc curved surface which is in tangential smooth transition with the clamping inner hole D, correspondingly, a special-shaped connecting plate 22 is bridged between the rear ends of the two half single bodies and at the rear side of the supporting and positioning platform 601, and the horizontal projection structure of the special-shaped connecting plate 22 is U-shaped, arc-shaped or curved ruler-shaped.

In the above, the balance weight U is protruded from the upper part of the front end of the pipe bending single-side clamping huff clamp 62, the height of the balance weight U is the same as that of the supporting and positioning table 601, and the lower part of the pipe bending single-side clamping huff clamp 62 is horizontally connected with a pair of clamping screws B in a penetrating way, and the vertical surface of the symmetrical axis of the pair of clamping screws B is positioned outside the outer wall of the front end of the supporting and positioning table 601; and the lower section of the central axis of the branch pipe generating hole J and the operating hole L is positioned outside one side of the rear part of the pair of clamping screws B which is deviated from the mounting special-shaped connecting plate 22.

In the above, the bottom middle of the special-shaped connecting plate 22 has an upper concave angular groove. In use the corner groove is adapted to receive a two sided monomer press-clamped on top of the steel pipe C and bridging the symmetrical double sided clamp half clamp 61.

In the above, the special-shaped connecting plate 22 has at least two horizontal mounting holes. Through the group of horizontal mounting holes, the special-shaped connecting plate 22 is tightly connected with the three-way machine supporting plate 1 along two outer vertical surfaces of the axial direction of the clamping inner hole D.

In the embodiment of the invention, a bent pipe-shaped steel pipe C is placed into a clamping inner hole D, wherein a straight pipe part is positioned on one side of the front end of a bent pipe single-side clamping half clamp 62, the bent pipe part is matched with the inner side wall of an arc-shaped guide angle platform 622 to be naturally bent, a clamping screw B is tightened, the bent pipe single-side clamping half clamp 62 is closed, a three-way machine support plate 1 is arranged on a supporting and positioning platform 601, two axial ends of the bent pipe single-side clamping half clamp 62 are respectively bridged with a direct connecting plate 21 and a special-shaped connecting plate 22, and the rigid connection of the three-way machine support plate 1, the direct connecting plate 21, the special-shaped connecting; further, the bottom side clamping vertical surface P of the pipe bending single side clamping half clamp 62 is clamped by the bench vice 7. And then installing a cold-drawing three-way machine above the three-way machine supporting plate 1 for operation.

Claims (8)

1. The anti-skidding rigid support clamp for clamping the steel pipe of the small cold-drawing three-way machine is characterized in that the half clamp comprises two half monomers axially horizontally opening the pipe groove at the middle upper part of the inner side surfaces which are in opposite contact, and the two half monomers are closed to form a circular pipe-shaped clamping inner hole (D) after being oppositely installed; moreover, the two half single bodies are connected into a whole at the lower part through a clamping screw (B); a supporting and positioning table (601) is convexly arranged in the middle of the upper side of the symmetrical bilateral clamping huff clamp (61), an operating hole (L) is concavely arranged in the middle of the top surface of the supporting and positioning table (601), a branch pipe generating hole (J) communicated with the clamping inner hole (D) is further concavely arranged in the middle of the operating hole (L) in a diameter reducing manner, and the branch pipe generating hole (J) is coaxial with the operating hole (L); the outer edge of the outer wall of the middle upper part of the half clamp protrudes towards four corners, the top surface of the half clamp forms a supporting surface (E), the corner parts of the half clamp are respectively provided with a mounting hole (K) downwards, at least one side of the middle part of at least one end of the half clamp is provided with an inclined guide fan-shaped notch (Q) inwards in the axial direction of a clamping inner hole (D), the vertical surfaces (F) of the supporting and positioning table (601) in the axial direction of the outer walls at the two axial ends of the clamping inner hole (D) are mutually parallel, and the vertical surfaces (G) of the supporting and positioning table (601) in the pipe side of the outer walls at two axial; the lower part of the half clamp is parallel to two axial outer sides of the clamping inner hole (D) and is provided with vertical bottom side clamping vertical surfaces (P) which are parallel to each other; the downward extending section of the vertical line passing through the gravity center of the half clamp is vertical to the horizontal plane passing through the clamping screw (B) at the lower part of the half clamp, and the clamping screw (B) takes the vertical line as a symmetry axis; the half surface (A) of the half fixture is a geometric symmetry surface of the tee joint, namely a plane where the axes of the main pipe (4) and the branch pipe (5) of the tee joint are located, and the two half fixtures are connected together in a balanced manner by adopting at least two clamping screws (B); the connecting plates are connected with a support plate (1) of the three-way machine and a half clamp, 2 connecting plates are fixed on two axial outer sides of the support plate (1) of the three-way machine in a bridging manner, and each connecting plate is fixedly connected with two axial outer end faces of the half clamp through a group of 2-4 connecting screws (T); the inner wall of at least one end of the half clamp is outwards inclined to form a guide structure.

2. The method for clamping and anti-skidding rigid support of the steel pipe of the small cold-drawing three-way machine is characterized in that a half clamp and a connecting plate are fastened by a clamping screw (B) and a connecting screw (T) and rigidly connected with a support plate (1) of the three-way machine into a whole, a clamping inner hole (D) encircles and clamps the steel pipe (C), and the clamping structure has a 100 percent circumferential clamping structure for the steel pipe (C); the half clamp realizes the multi-directional control composite plane positioning of the three-way machine support plate (1) and the steel pipe (C) by controlling the support surface (E), the axial upper vertical surface (F), the pipe side vertical surface (G), the axial bottom vertical surface (H) and the bottom side clamping vertical surface (P) to rigidly support the three-way machine support plate (1), and simultaneously, the top support surface (E) of the half clamp contacts the bottom plane of the three-way machine support plate (1) and the bottom plane (S) of the connecting plate to realize plane support; and a bottom clamping force is applied in conjunction with a pneumatic, hydraulic or manual vise.

3. The method and apparatus for rigid support of small size cold drawing tee machine steel pipe with anti-slip function as claimed in claim 1, wherein the inner wall surface of the clamping inner hole (D) has rough surface structure or anti-slip groove.

4. The method and the fixture for clamping, anti-skidding and rigid supporting of the small-sized cold-drawing three-way machine steel pipe according to claim 1 are characterized in that the middle part of the bottom side of the connecting plate is provided with an upper concave angle groove, and the connecting plate is provided with at least two horizontal mounting holes for fixing the supporting plate (1) of the three-way machine.

5. The method and the fixture for clamping, anti-skidding and rigid supporting of the small-sized cold-drawing three-way machine steel pipe according to claim 1 are characterized in that the central axis of the clamping inner hole (D) is lower than the supporting surface (E), the top surface of the clamping inner hole (D) is lower than the bottom end of the operation hole (L) in the middle of the supporting and positioning table (601), and the circumferential inner wall of the clamping inner hole (D) beside the branch pipe generation hole (J) of the supporting and positioning table (601) is closed.

6. The method and the fixture for clamping, slipping-proof and rigid supporting of steel pipes of small cold-drawing three-way machine according to claim 1 are characterized in that the distance between the side vertical surfaces (G) of the two side pipes is larger than the distance between the bottom clamping vertical surfaces (P) of the two outer sides at the two outer sides in the axial direction parallel to the clamping inner hole (D); the distance between the two outer ends along the axial direction of the clamping inner hole (D) and the inner ends of the two fan-shaped notches (Q) is aligned with the outer wall of the tee machine supporting plate (1) on the same side; along the axial direction of the clamping inner hole (D), the distance between the two outer ends and the vertical surface (F) on the two axial directions is smaller than the distance between the vertical surfaces (H) on the two axial directions.

7. The method and the clamp for clamping, anti-skidding and rigid supporting of the small cold-drawing three-way machine steel tube according to claim 1 are characterized in that the half clamp is a symmetrical double-side clamping half clamp (61) and comprises two completely symmetrical half monomers with axial horizontal pipe grooves at the middle upper parts of the inner side surfaces in opposite contact, the direct connecting plates (21) positioned at the outer sides of the two axial ends of the symmetrical double-side clamping half clamp (61) are respectively and axially installed in a mode of being vertical to a clamping inner hole (D), the two ends of the direct connecting plates (21) are provided with vertical installing holes, and the direct connecting plates (21) are respectively fixed on the installing holes (K) at the corners of the symmetrical double-side clamping half clamp (61) in a penetrating and connecting mode through connecting screws (T); a pair of clamping screws (B) are evenly arranged at the lower part of the symmetrical bilateral clamping half clamp (61), and the lower section of the central axis of the branch pipe generation hole (J) and the operating hole (L) is positioned between the clamping screws (B).

8. The method and the fixture for the rigid anti-slip support for the steel pipe clamping of the small cold-drawing three-way machine according to claim 1 are characterized in that the half fixture is a pipe bending single-side clamping half fixture (62) which comprises two half single bodies, a hole (J) is generated from a branch pipe along the axial direction of a clamping inner hole (D), the two half single bodies are completely symmetrical in structure with the part from the central axis to the front end of an operation hole (L), and a direct connecting plate (21) is bridged between the front ends of the two half single bodies and between a supporting and positioning table (601) and an arc-shaped guide angle table (622); the middle shafts of the holes (J) and the operation holes (L) are generated from the branch pipes to the partial structure of the other rear end, the outer end of the middle upper part of at least one half single body partial structure is provided with an arc-shaped guide angle table (622), the inner side edge of the arc-shaped guide angle table (622) is not only provided with a fan-shaped notch (Q) structure, but also provided with an arc-shaped curved surface which is smoothly transited with the tangential direction of the clamping inner hole (D), correspondingly, a special-shaped connecting plate (22) is bridged between the rear ends of the two half single bodies and at the rear side of the supporting and positioning table (601), and the horizontal projection structure of the special-shaped connecting plate (22) is U; a balance block (U) is arranged on the upper part of the front end of the elbow pipe single-side clamping half clamp (62) in a protruding mode, the height of the balance block (U) is the same as that of the supporting and positioning table (601), in addition, a pair of clamping screws (B) are horizontally connected to the lower part of the elbow pipe single-side clamping half clamp (62) in a penetrating mode, and the vertical face of the symmetrical shaft of the pair of clamping screws (B) is positioned on the outer side of the outer wall of the front end of the supporting and positioning table (601); and the lower section of the central axis of the branch pipe generating hole (J) and the operating hole (L) is positioned outside one side of the rear part of the pair of clamping screws (B) which is deviated from the mounting special-shaped connecting plate 22.

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