CN111633089A - Orifice device for rounding metal catheter tube end and its inner support assembly - Google Patents

Abstract

The invention discloses an inner support component of a shaping device used for rounding the tube end of a metal catheter, which comprises a conical head tie rod, a multi-lobed inner support die and a guide seat. The multi-lobed inner support die forms an inner support with a cylindrical outer contour. The inner support body penetrates the guide seat, and the front part of the inner support body protrudes out of the guide seat, and the rear part of the inner support body extends with an annular convex ring and is axially limited by the guide seat through the annular convex ring ; The inner support body and the guide seat are in clearance fit, so that the multi-lobed inner support die on the inner support body can move along the radial direction of the inner support die; the inner cone surfaces of the multi-lobed inner support die are combined to form a conical stress cavity , the cone-head tie rod is located in the force-bearing cavity, and the cone-head tie rod has an outer conical surface matching the force-bearing cavity, and the cone-head tie rod moves backwards to drive the inner support to expand outwardly. This scheme adopts a stretch-expanded inner support structure. When rounding, the end of the inner support die is stressed, and the tapered tie rod can effectively support the inner support die, avoiding the formation of torque, which is beneficial to the rounding of the pipe end of the catheter.

Description

Orifice device for rounding metal catheter tube end and its inner support assembly

technical field

The present invention relates to plastic forming tube end shaping of metal conduit, more particularly, it relates to a shaping device for rounding metal conduit tube end and its inner support assembly.

Background technique

Due to the limitation of functional requirements and compact assembly space in the fields of aviation, aerospace, aviation, nuclear power, etc., the demand for conduits with short straight sections at both ends of the elbow is increasing. The straight section of the pipe end is shortened, which reduces the demand for assembly space, but because the pipe end is too close to the elbow, the plastic deformation of the elbow often leads to the flattening, collapse and other deformation of the pipe end. When the pipe end is welded with flanges, metal hoses, joints, etc., a large welding dislocation is formed, even exceeding the allowable height of 0.1δ (δ: pipe wall thickness) for the dislocation height of Class I welds in QJ2865A "Technical Requirements for Conduit Welding" value, which affects the stability and reliability of the pipe joint. At present, metal conduits are plastically formed, and the commonly used shaping processes for tube ends are: 1) Extrude the tube end by hydraulic extrusion of a forming die; 2) Insert a conical mandrel of the same diameter into the end of the tube end; 3) Use a flared die and The shrinking die first expands and then shrinks. 1) and 2) two shaping methods can play a certain role in shaping, but there is no protection inside or outside the tube, and the shaping effect is not good; the third shaping method has complicated procedures and high cost of input molds; the above shaping methods There is no universality for the shaping of pipe ends of different specifications, and a higher mold cost needs to be invested.

The Chinese patent with the authorization announcement number CN106825273B discloses a full-circle diameter expansion device, which specifically includes a rebound device, a round head, a push rod, a frame, and a driving device. The head is sleeved on the push rod, the push rod is connected to the driving device, and the round head, the push rod and the driving device are all connected to the frame. , the problem of large quantity and relatively high cost, and its structure is light and compact, the structure is simple, and the cost is greatly reduced.

The Chinese patent with the authorization announcement number CN204953582U discloses a pipe fitting inner support type rounding machine, which specifically includes a motor, a frame, an eccentric shaft and a rounding mechanism; the motor is fixedly installed at the lower part of the frame, and the upper end of the frame is a worktable , the eccentric shaft is located above the worktable, the motor drives the eccentric shaft to rotate through the transmission mechanism, and the circular adjustment mechanism is installed on the worktable. The circular adjustment mechanism includes a connecting rod, a taper rod and a support head. When rotating, the connecting rod performs horizontal reciprocating motion driven by the eccentric shaft, the tapered rod is installed at the end of the connecting rod, and the conical section of the tapered rod is located in the support head; this pipe fitting inner support rounding machine can complete the internal shaping of the pipe fittings Calibration work, low noise during work, and high work efficiency, in addition, the equipment is simple in structure and low in cost, which reduces the cost of the enterprise.

However, the pipe end rounding mechanisms disclosed in the above-mentioned two patents are both push-and-expanded inner support structures, which have the following drawbacks:

1) When rounding, if the push rod does not protrude from the end of the round head, a torque is formed, and the round head is lifted to form a tapered angle, resulting in a bell mouth at the pipe end, and no effective rounding effect can be obtained;

2) When the push rod moves forward, forces in two directions are formed, including radial force and axial force. The radial force pushes the round head to expand radially, but its axial force pushes the round head to the When moving forward and rounding, the round head is pushed forward by the push rod, and a reliable connection structure is required to prevent the round head from separating from the frame. If it is used for a long time, the connection between the round head and the frame will become weak. slack, which in turn affects the accuracy of the round tube correction.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, the present invention provides a shaping device for rounding the pipe end of a metal conduit and an inner support assembly thereof, the inner support assembly has high stability, strong load capacity and good pipe end shaping effect.

In order to achieve the above purpose, the present invention provides the following technical solutions: the inner support assembly of the shaping device used for the rounding of the metal conduit tube end includes a taper tie rod, a multi-lobed inner support mold and a guide seat, and the multi-lobed inner support mold is composed of an outer support. an inner support body with a cylindrical outline, the inner support body penetrates the guide seat, the front part of the inner support body extends out of the guide seat, and the rear part of the inner support body extends with an annular convex ring and passes through the ring The convex ring is axially limited by the guide seat; the inner support body and the guide seat are in clearance fit, so that the multi-lobed inner support mold on the inner support body can move along the radial direction of the inner support mold; the inner cone of the multi-lobed inner support mold The combination of the two surfaces forms a conical force-bearing cavity, the cone-head tie rod is located in the force-bearing cavity, and the cone-head tie rod has an outer conical surface that matches the force-bearing cavity, and the cone-head tie rod moves backwards to drive the inner External expansion. Compared with the existing push-and-expanded inner support structure, this solution adopts a pull-expanded inner support structure. When rounding, the end of the inner support die is stressed, and the tapered tie rod can effectively support the inner support die, avoiding The resulting torque facilitates rounding of the catheter tube end. At the same time, the inner support die of the present invention runs through the guide seat and the rounded end. During the rounding, the inner support die is pulled backward by the taper tie rod, and the guide seat effectively supports the inner support die, balancing the axis of the taper tie rod. The force can prevent the inner support mold from moving backwards.

Preferably, an annular inner cavity structure is formed inside the guide seat, and the annular convex ring is embedded in the annular inner cavity structure to axially limit the inner support body on the guide seat.

Preferably, the guide seat is also provided with an elastic member for urging the inner support to retract and return.

Preferably, the elastic member is arranged in the annular inner cavity structure, and one end of the elastic member is fixed on the guide seat, and the other end of the elastic member abuts against the inner support body and gives the inner support body the ability to shrink inwardly. trend.

Preferably, the guide seat includes a guide seat main body and a pressing cover installed on one side of the guide seat main body, the inner annular inner cavity structure is formed in the guide seat main body, and the pressing cover is connected to the guide seat. The main bodies cooperate to axially limit the annular convex ring in the annular inner cavity structure.

Preferably, the multi-lobe inner support mold is provided with a positioning key keyway; the pressing cover is provided with a limit slot corresponding to the position of the positioning key keyway; the positioning key keyway is embedded with a positioning key, and at the same time, the positioning key The outer end of the key is embedded in the limiting groove.

Preferably, the front end of the multi-lobe inner support mold is further provided with orthopedic sleeves, and the multi-lobed orthopedic sleeves are combined into a cylindrical shape and detachably fixed to the end of the inner support body as the orthopedic end; or, the material of the orthopedic sleeve is For brass or aluminum bronze.

Preferably, a tube end sheath is also included, and the tube end sheath includes at least two-lobed sheath splits; when rounding, the two-lobed sheath splits form a cylindrical shape and are locked by fasteners, while covering The outer contour of the pipe end of the metal conduit to be rounded is such that the pipe end of the metal conduit is located between the tapered tie rod and the pipe end sheath.

Preferably, the matching clearance between the cylindrical outer contour of the multi-lobed inner support mold and the guide seat is equal to the range within which the inner support mold can be expanded outward.

The shaping device for rounding the end of a metal conduit tube includes the inner support assembly of the shaping device for rounding the tube end of a metal conduit as described above.

To sum up, the present invention has the following beneficial effects:

1. Compared with the existing push-and-expanded inner support structure, this scheme adopts a pull-expanded inner support structure. When rounding, the end of the inner support die is stressed, and the tapered tie rod can effectively support the inner support die. , avoiding the formation of torque is conducive to the rounding of the catheter tube end;

2. The inner support die of the present invention runs through the guide seat and the rounded end. During the rounding, the inner support die is pulled backward by the tie rod, and the guide seat effectively supports the inner support die, balancing the axial direction of the taper tie rod. The force can prevent the inner support mold from moving backward;

3. The front end of the multi-lobed inner support mold of the present invention is also provided with an orthopedic sleeve, and the multi-lobed orthopedic sleeve is combined into a cylindrical shape and is detachably fixed to the end of the inner support body as an orthopedic end. The orthopedic sleeve can meet the orthopedic needs of different specifications of the pipe end;

4. The shaping device also includes a tube end sheath, which protects the outer contour of the tube and is conducive to improving the accuracy of rounding.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the sectional view of Fig. 1;

Fig. 3 is the structure exploded diagram of the present invention;

Fig. 4 is the structural representation of the inner support mold of the present invention;

Fig. 5 is the working state schematic diagram of the present invention;

FIG. 6 is a cross-sectional view of FIG. 5 .

Reference numerals: 1, inner support assembly; 101, taper tie rod; 102, inner support die; 10201, spring mounting hole; 10202, positioning key keyway; 103, orthopedic sleeve; 104, spring; 105, positioning key; 106, Guide seat; 10601, inner hole; 10602, set screw; 107, compression cover; 10701, limit slot; 10702, bolt; 108, stress cavity; 109, screw; 2, pipe end sheath; 201, guard 202, bolt; 3, hydraulic cylinder; 301, piston rod; 302, nut; 4, base; 401, bottom plate; 402, vertical plate.

Detailed ways

The present invention will be further described with reference to the accompanying drawings.

This embodiment discloses a shaping device for rounding the pipe end of a metal conduit, as shown in Figures 1, 2 and 3, comprising a base 4, an inner support assembly 1 disposed on the base 4, and a power source, the power source is Hydraulic cylinder 3, at the same time, hydraulic cylinder 3 adopts piston hydraulic cylinder, and the cylinder diameter matches the front and rear movement range of conical head tie rod 101 of inner support assembly 1; base 4 is composed of two mutually perpendicular bottom plates 401 and vertical plates 402, and the inner support assembly 1 and the hydraulic cylinder 3 are laterally arranged on the base 4, wherein the inner support assembly 1 is fixed on the bottom plate 401, and the hydraulic cylinder 3 is laterally fixed on the vertical plate 402; the above-mentioned hydraulic cylinder 3 is laterally installed on the rear end side of the inner support assembly 1 , the piston rod 301 of the hydraulic cylinder 3 is threadedly connected with the taper-head pull rod 101, and a nut 302 is added at the connection to be tightened to prevent loosening.

As shown in FIG. 3 and FIG. 4 , the inner support assembly 1 includes a conical head tie rod 101, a multi-lobed inner support mold 102, and a guide seat; the multi-lobed inner support mold 102 forms a cylindrical inner support body with a cylindrical outer contour. Through the guide seat, the front part of the inner support body protrudes out of the guide seat, and the rear part of the inner support body extends with an annular convex ring and is axially limited by the guide seat through the annular convex ring. The structure of the annular convex ring is as follows: Arc-shaped bumps are respectively formed on the inner support mold of the petals, and the arc-shaped bumps on the multi-lobed inner support mold form an annular convex ring with an annular outer contour; at the same time, the inner support body is sleeved on the conical head tie rod 101. Specifically, The inner cone surfaces of the multi-lobed inner support mold 102 are combined to form a cone-shaped force-bearing cavity, the cone-head tie rod 101 is in the force-bearing cavity, and the cone-head tie rod 101 has an outer cone surface that matches the force-bearing cavity; in the radial direction On the upper side, the inner support body and the guide seat 106 are in clearance fit, so that the multi-lobed inner support mold 102 on the inner support body can move along the radial direction of the inner support mold 102; When shrinking inward, at the same time, the cylindrical outer contour of the multi-lobed inner support mold 102 and the matching clearance of the guide seat 106 are equal to the range that the inner support mold 102 can expand outward. Wherein, the cross-section of the force-bearing cavity gradually shrinks or increases in the direction from front to back, and when the cross-section of the force-bearing cavity gradually increases in the direction from front to back, the taper tie rod 101 moves forward to drive the inner support to expand; Preferably, the cross-section of the force-bearing cavity is gradually reduced from front to back, and the cross-section of the taper rod 101 is also gradually reduced from front to back, and the taper rod 101 moves backward to drive the inner support to expand outward, thereby forming a Expandable inner support structure. The rear end of the taper tie rod is connected with the hydraulic cylinder, the hydraulic cylinder 3 pulls the taper tie rod 101 to move backwards, the taper tie rod 101 moves backward relative to the inner support mold 102 and promotes the inner support mold 102 to expand outward, and the inner support mold 102 expands and merges. Squeeze the end of the pipe end, so as to realize the process of rounding and shaping the end of the pipe end. When unloading, the hydraulic cylinder 3 pushes the conical head rod 101 to move forward, the inner support mold 102 shrinks inward in the center direction, and the conduit can be pulled out from the end of the inner support mold 102 . Compared with the existing push-and-expanded inner support structure, during rounding, the end of the inner support die 102 of the stretch-expanded inner support structure is stressed, and the tapered tie rod 101 can effectively support the inner support die 102 , avoiding the formation of torque is conducive to the rounding of the catheter tube end. At the same time, the inner support die 102 of the present invention penetrates the guide seat 106 and the rounded end. During the rounding, the inner support die 102 is pulled backward by the tapered head tie rod 101, and the guide seat 106 effectively supports the inner support die 102. Balance The axial force of the conical head tie rod 101 can be prevented, so that the inner support die 102 can be prevented from moving backward. At the same time, the shaping device has the advantages of simple structure, high stability, strong load capacity and good shaping effect of the pipe end.

The guide seat includes a guide seat body and a compression cover installed on one side of the guide seat body. An annular inner cavity structure is formed inside the guide seat body, and the annular convex ring is embedded in the annular inner cavity structure, and the compression cover (107 ) cooperates with the guide seat main body (106) to axially limit the annular convex ring in the annular inner cavity structure, and then limit the inner support body to the guide seat in the circumferential direction; in this way, it is convenient for the inner support body to guide Assembly of seat 106 . Similarly, in the radial direction, it is defined above that the inner support body and the guide seat 106 are in clearance fit, and the annular convex ring and the annular inner cavity structure are also in clearance fit; further, the multi-lobed inner support mold on the inner support body can be made to be in clearance fit. 102 is movable in the radial direction of the inner support mold 102 .

The outer contour of the multi-lobe inner support mold 102 is formed into a cylindrical shape, which is placed in the guide seat 106, and is limited and supported by the elastic member and the positioning key 105 in the circumferential direction; specifically, the multi-lobe inner support mold 102 is provided with a positioning key keyway. 10202; Limiting grooves 10701 are provided on the pressing cover 107 at positions corresponding to the positioning key keyway 10202, and each limiting groove 10701 is arranged at equal intervals along the inner wall of the pressing cover 107; The outer end of the 105 is inserted into the limiting groove 10701 to limit the inner support body on the guide seat 106 in the circumferential direction, so as to prevent the inner support body from rotating in the circumferential direction.

At the same time, the guide seat is also installed with an elastic member for promoting the retraction and return of the inner support. For the specific structure of the elastic member, please refer to the authorized bulletin number CN106825273B; Fixed on the guide seat, the other end of the elastic piece is abutted against the inner support body and gives the inner support body a tendency to shrink inward; wherein, the elastic piece is a spring 104; the outer contour of each inner support mold 102 is provided with The spring mounting hole 10201 is provided with an inner hole 10601 on the guide seat 106 corresponding to the position of the spring mounting hole 10201. One end of the spring 104 is embedded in the spring mounting hole 10201 and abuts against the inner support mold 102, and the other end of the spring 104 is embedded in the inner hole 10601 and The set screw 10602 is limited in the inner hole 10601, and the arrangement of the spring 104 supports and resets the inner support mold 102. The elastic member has a simple structure and does not need the support of the elastic member bracket structure.

Preferably, an orthopedic sleeve 103 is also provided at the front end of the multi-lobed inner support mold 102. The multi-lobed orthopedic sleeve 103 is combined into a cylindrical shape and is detachably fixed to the end of the inner support body as an orthopedic end. The sleeve 103 is fixed to the orthopedic end of the inner support mold 102 by means of screws 109. In this way, the orthopedic sleeve 103 with different outer diameters can be replaced to meet the orthopedic requirements of the pipe end of different specifications. The above-mentioned outer diameter of the orthopedic sleeve 103 is smaller than the inner diameter of the orthopedic tube end, and the difference between the two is smaller than the range that the orthopedic device can expand outward; and the orthopedic sleeve 103 is made of brass or aluminum bronze, which can prevent the formation of obvious indentations on the inner surface of the tube.

Further, the shaping device also includes a tube end sheath 2, and the tube end sheath 2 includes at least two-lobed sheath splits 201, and the sheath splits 201 are semicircular; when rounding, the two-lobed sheath splits 201 forms a cylindrical shape and covers the outer contour of the metal conduit pipe end to be rounded, so that the metal conduit pipe end is located between the taper tie rod 101 and the pipe end sheath 2, at the same time, the two sides of the pipe end sheath 2 are locked with bolts 202 The inner diameter is larger than the outer diameter of the pipe end to be rounded, and the difference between the two is the rebound amount of the rounding of the metal conduit, which protects the outer contour of the pipe. The hydraulic cylinder 3 pulls the conical head tie rod 101 to move backward, and the conical head tie rod 101 moves backward relative to the inner support mold 102 to cause the inner support mold 102 to drive the orthopedic sleeve 103 to expand outward, and the orthopedic sleeve 103 and the pipe end sheath 2 work together to squeeze the pipe end end, so as to realize the process of rounding and shaping the end of the pipe. When unloading, the hydraulic cylinder 3 pushes the taper rod 101 to move forward, the inner support die 102 shrinks toward the center under the action of the spring 104, and drives the orthopedic sleeve 103 to shrink. .

The above-mentioned taper tie rod 101 , inner support die 102 , guide seat 106 and pressing cover 107 contact surfaces with each other as smooth surfaces, which reduces the wear of the taper surface, reduces the output resistance of the hydraulic cylinder 3 force, and improves the structural stability.

The numbers of the inner support molds 102 , the return springs 104 , the positioning keys 105 , and the limit grooves 10701 of the pressing cover 107 of the inner support assembly 1 are the same, and the number is all four in this embodiment.

As shown in FIG. 5 and FIG. 6 , the orthopedic sleeve 103 and the tube end sheath 2 are designed according to the specifications of the round tube 5 to be corrected. When rounding, the orthopedic sleeve 103 is placed on the tube end of the tube 5 to be rounded, and the two-lobed sheath body 201 is combined into a cylindrical shape and covers the outer contour of the tube end. The hydraulic cylinder 4 pulls the conical head tie rod 101 to move backwards, and the conical head tie rod 101 moves backward relative to the inner support die 102 to cause the inner support die 102 to drive the orthopedic sleeve 103 to expand outward, and work together with the tube end sheath 2 to squeeze the end of the tube end, At the same time, the conical head tie rod 101 effectively supports the orthopedic end, so as to realize the rounding and shaping treatment of the end of the pipe end. When unloading, the hydraulic cylinder 3 pushes the taper rod 101 to move forward, the inner support die 102 shrinks toward the center under the action of the spring 104, and drives the orthopedic sleeve 103 to shrink. .

The invention provides a shaping device for rounding the tube end of a metal catheter. The outer diameter of the orthopedic end of the shaping device is adjustable, which is convenient for loading and unloading when the tube end is shaped, saves loading and unloading time, and improves work efficiency. For the shaping of catheter tube ends of different specifications, only the orthopedic sleeve 103 and the tube end sheath 2 need to be replaced, which saves the investment of the mold cost and reduces the manufacturing cost.

The specified directions in this specific embodiment are only for the convenience of expressing the positional relationship and the mutual cooperation relationship between the various components. The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims (10)

1. The inner support assembly of the reshaping device for rounding the pipe end of the metal guide pipe comprises a conical head pull rod (101), a multi-petal inner support die (102) and a guide seat, and is characterized in that the multi-petal inner support die (102) forms an inner support body with a cylindrical outer profile, the inner support body penetrates through the guide seat, the front part of the inner support body extends out of the guide seat, and the rear part of the inner support body extends to form an annular convex ring and is axially limited by the guide seat through the annular convex ring; the inner supporting body is in clearance fit with the guide seat, so that the multi-flap inner supporting die (102) on the inner supporting body can move along the radial direction of the inner supporting die (102); the inner conical surfaces of the multi-petal inner supporting die (102) are combined to form a conical stress cavity (108), the conical head pull rod (101) is located in the stress cavity (108), the conical head pull rod (101) is provided with an outer conical surface matched with the stress cavity (108), and the conical head pull rod (101) moves backwards to drive the inner supporting body to expand outwards.

2. The inner support assembly of the reshaping device for pipe end rounding of the metal guide pipe as claimed in claim 1, wherein an annular inner cavity structure is formed inside the guide seat, and the annular convex ring is embedded into the annular inner cavity structure so as to axially limit the inner support body on the guide seat.

3. The inner support assembly of the reshaping device for rounding the tube end of a metal guide tube as claimed in claim 1, wherein an elastic member for urging the inner support to retract and return is further installed on the guide holder.

4. The inner support assembly of the reshaping device for rounding the tube end of a metal guide tube as claimed in claim 2, wherein the elastic member is arranged in the annular inner cavity structure, one end of the elastic member is fixed on the guide seat, and the other end of the elastic member abuts against the inner support body and gives the inner support body a tendency to retract.

5. The inner support assembly of the reshaping device for pipe end rounding of the metal guide pipe according to claim 1, wherein the guide base comprises a guide base main body (106) and a pressing cover (107) installed on one side of the guide base main body (106), the annular inner cavity structure is formed inside the guide base main body (106), and the pressing cover (107) is matched with the guide base main body (106) to axially limit the annular convex ring in the annular inner cavity structure.

6. The inner support assembly of the reshaping device for rounding the pipe end of the metal guide pipe as claimed in claim 5, wherein the multi-petal inner support die (102) is provided with positioning key slots (10202); a limiting groove (10701) is formed in the position, corresponding to the positioning key groove (10202), of the pressing cover (107); the embedded positioning key (105) that has of positioning key keyway (10202), simultaneously, the outside end embedding of positioning key (105) is in spacing groove (10701).

7. The inner support assembly of the reshaping device for rounding the pipe end of the metal conduit according to claim 1, wherein the front ends of the multi-petal inner support dies (102) are respectively provided with a reshaping sleeve (103), and the multi-petal reshaping sleeves (103) are combined into a cylindrical shape and are detachably fixed at the end part of the inner support body to serve as a reshaping end; or the orthopedic sleeve (103) is made of brass or aluminum bronze.

8. The inner support assembly of the reshaping device for rounding the tube end of a metal catheter according to claim 1, further comprising a tube end sheath (2), wherein the tube end sheath (2) comprises at least two sheath split bodies (201); when in rounding, the two sheath split bodies (201) form a cylinder shape and are locked by a fastener, and simultaneously coat the outer contour of the end of the metal conduit pipe to be rounded, so that the end of the metal conduit pipe is positioned between the conical head pull rod and the pipe end sheath.

9. The inner support assembly of the reshaping device for rounding the pipe end of a metal guide pipe according to claim 1, wherein the fit clearance between the cylindrical outer profile of the multi-petal inner support die (102) and the guide seat (106) is equal to the expandable range of the inner support die (102).

10. The shaping device for rounding the pipe end of the metal conduit is characterized by comprising the inner support assembly of the shaping device for rounding the pipe end of the metal conduit according to any one of claims 1 to 9.

Images