Pipe expanding equipment for large reducing elbow

Abstract

The utility model discloses pipe expanding equipment for a large reducing elbow, which relates to the technical field of elbow processing equipment and comprises a workbench, an arc-shaped guide pipe is assembled at the right end of the top of the workbench, the right side of the arc-shaped guide pipe is in contact with an elbow placing pipe, and the left side of the arc-shaped guide pipe is fixedly connected with a guide pipe. And a bendable push rod is placed on the inner side of the guide pipe. The spiral cooling water tank is arranged on the surface of the core rod inner support inside the ox-horn-shaped core rod, the double-layer circulating cooling water pipe is embedded in the spiral cooling water tank, cooling media can be tightly attached to the inner wall of the ox-horn-shaped core rod to spirally flow, an elbow is cooled, and the positioning mechanism provides pressing force through the spring, so that the positioning accuracy is improved. The end of the elbow is limited in the radial direction through the limiting rod, so that the elbow is located at the axis position of the elbow containing pipe, the wall thickness of the variable-diameter elbow changes evenly, the situation that one side of the elbow is thick and the other side of the elbow is thin at the same circle position is avoided, and the product quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to elbow processing equipment technical field, concretely is a kind of pipe expanding equipment for big reducing elbow. BACKGROUND

[0002] Elbow is the key connecting piece in industrial pipeline system, especially under the working condition of big reducing and high pressure, it puts forward strict requirements to the forming quality, dimensional accuracy and material performance of elbow, and traditional elbow manufacturing method, such as push, pressing or hot bending, for big reducing elbow (i.e.

[0003] Forming precision and stability are insufficient: the pipe expanding process of big reducing elbow is complex in stress, the relative position of mandrel and pipe blank is easy to deviate due to huge radial force, leading to elbow axis twist, ovality out of limit, and poor product consistency;

[0004] Cooling efficiency and forming quality conflict: in order to obtain ideal metal organization and mechanical property, elbow needs to be cooled quickly and uniformly after hot expansion, and traditional external spray cooling method has poor cooling effect on the inside of elbow, especially the contact area with mandrel, and uneven cooling easily leads to large difference in organization property and high residual stress;

[0005] Equipment versatility and clamping reliability problem: for different specifications of elbow, especially big reducing elbow which needs to be positioned from both ends, existing clamp is mostly rigid structure, poor in adaptability, and it is difficult to realize flexible positioning on arc pipe which provides reliable constraint and does not damage the surface of workpiece. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a kind of pipe expanding equipment for big reducing elbow to solve the problems raised in the above background technology.

[0007] To achieve the above object, the utility model provides the following technical scheme: a kind of pipe expanding equipment for big reducing elbow, including workbench, the right end of the top of workbench is equipped with arc guide pipe, and the right side of arc guide pipe is contacted with elbow placement pipe, the left side of arc guide pipe is fixedly connected with guide pipe, and the inside of guide pipe is placed with bendable push rod, the right side of bendable push rod is fixedly connected with pipe expanding mechanism, and pipe expanding mechanism includes horn-shaped mandrel, the inside of horn-shaped mandrel is fixedly connected with mandrel inner support, and the outer surface of mandrel inner support is equipped with cooling mechanism, the surface of elbow placement pipe is equipped with positioning mechanism, and positioning mechanism includes mounting ring, the outside of mounting ring is fixedly connected with multiple equal-angle distribution springs, the tail end of spring is fixedly connected with end plate, the inside of end plate is fixedly connected with limit rod, and the inner end of limit rod penetrates mounting ring and elbow placement pipe.

[0008] Preferably, the cooling mechanism comprises a core rod inner support, a spiral-shaped cooling water groove is arranged on the outer side of the core rod inner support, a cooling water pipe is arranged on the inner side of the cooling water groove, a long groove is arranged at the connection position of the arc-shaped guide pipe and the cooling water pipe, the cooling water pipe is a double-layer circulating water pipe, the cooling water pipe comprises a cooling water pipe output pipe and a cooling water pipe input pipe, the cooling water pipe output pipe and the cooling water pipe input pipe are arranged in the cooling water groove, a heat insulation pad is arranged between the cooling water pipe output pipe and the cooling water pipe input pipe, the inner ends of the cooling water pipe output pipe and the cooling water pipe input pipe are communicated, the front half of the cooling water pipe is the cooling water pipe input pipe, and the rear half of the cooling water pipe is the cooling water pipe output pipe.

[0009] Preferably, the number of the mounting rings and the elbow placing pipes is two, and the two elbow placing pipes and the two mounting rings are connected through connecting blocks and bolts and nuts.

[0010] Preferably, a group of end plates, springs and limiting rods are arranged on the lowermost end of the surface of the mounting ring at the lower end.

[0011] Preferably, the elbow placing pipe is in an arc-shaped structure, the arc degrees of the arc-shaped guide pipe and the elbow placing pipe are the same, and the axis centers of the arc-shaped guide pipe and the elbow placing pipe coincide, a forming cavity is arranged in the elbow placing pipe, the forming cavity corresponds to the middle section of the horn-shaped core rod, a positioning mechanism is arranged at the large-diameter end of the forming cavity, and a semi-annular baffle is arranged at the small-diameter end of the forming cavity of the elbow placing pipe.

[0012] Preferably, the inner diameter of the semi-annular baffle is smaller than the small diameter of the forming cavity and larger than the inner diameter of the elbow.

[0013] Preferably, the utility model also comprises a hydraulic cylinder, the telescopic end of the hydraulic cylinder is fixedly connected with a push block, the right side of the push block is fixedly connected with the left side of the bendable push rod, the bottom of the fixed end of the hydraulic cylinder and the bottom of the elbow placing pipe and the arc-shaped guide pipe are fixedly connected with a pad block, and the bottom of the pad block is fixedly connected with the top of the workbench.

[0014] Compared with the prior art, the utility model has the advantages of the following:

[0015] The utility model discloses a spiral-shaped cooling water groove is arranged on the surface of the core rod inner support in the horn-shaped core rod, and a double-layer circulating cooling water pipe is embedded, the design makes the cooling medium (water or cooling liquid) can be close to the horn-shaped core rod inner wall and carry out spiral flow, thereby cooling treatment is carried out to the elbow, and the heat insulation pad is arranged between the cooling water pipe output pipe and the cooling water pipe input pipe, can effectively avoid the heat exchange between the input pipe and the output pipe, and then the heat exchange efficiency is improved.

[0016] Meanwhile, the positioning mechanism adopts the spring to provide the compression force, the elbow end is limited in the radial direction through the limiting rod, the elbow is located on the axis position of the elbow placing pipe, thereby the wall thickness of the reducing elbow changes uniformly, the situation that one side is thick and the other side is thin does not appear in the same circle position, and the product quality is improved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the positioning mechanism of this utility model;

[0019] Figure 3 This is a schematic diagram of the flexible push rod structure of this utility model;

[0020] Figure 4 This is a cross-sectional view of the tube expansion mechanism of this utility model;

[0021] Figure 5 This is a schematic diagram of the elbow placement pipe structure of this utility model.

[0022] In the diagram: 1. Workbench; 2. Push block; 3. Semi-circular baffle; 4. Positioning mechanism; 41. Mounting ring; 42. Limiting rod; 43. Spring; 44. End plate; 5. Arc-shaped guide tube; 6. Guide tube; 7. Expanding tube mechanism; 71. Cooling water pipe; 72. Horn-shaped mandrel; 73. Cooling water pipe output pipe; 74. Cooling water pipe input pipe; 75. Cooling water tank; 76. Heat insulation pad; 77. Mandrel inner support; 8. Hydraulic cylinder; 9. Bendable push rod; 10. Pad block; 11. Elbow placement pipe; 12. Long groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-5 A pipe expanding device for large-diameter elbows includes a workbench 1. An arc-shaped conduit 5 is mounted on the right end of the top of the workbench 1, and the right side of the arc-shaped conduit 5 contacts an elbow placement pipe 11. A guide pipe 6 is fixedly connected to the left side of the arc-shaped conduit 5, and a flexible push rod 9 is placed inside the guide pipe 6. A pipe expanding mechanism 7 is fixedly connected to the right side of the flexible push rod 9. The pipe expanding mechanism 7 includes a horn-shaped mandrel 72. An inner support 77 is fixedly connected to the inner side of the horn-shaped mandrel 72, and a cooling mechanism is mounted on the outer surface of the inner support 77. A positioning mechanism 4 is mounted on the surface of the elbow placement pipe 11. The positioning mechanism 4 includes a mounting ring 41. A plurality of equally angled springs 43 are fixedly connected to the outer side of the mounting ring 41. An end plate 44 is fixedly connected to the end of the springs 43. A limit rod 42 is fixedly connected to the inner side of the end plate 44, and the inner end of the limit rod 42 passes through the mounting ring 41 and the elbow placement pipe 11.

[0025] The cooling mechanism comprises a core rod inner support 77, a spiral-shaped cooling water groove 75 is arranged on the outer side of the core rod inner support 77, a cooling water pipe 71 is arranged on the inner side of the cooling water groove 75, a long groove 12 is arranged at the connecting position of the arc-shaped guide pipe 5 and the cooling water pipe 71, the cooling water pipe 71 is a double-layer circulating water pipe, the cooling water pipe 71 comprises a cooling water pipe output pipe 73 and a cooling water pipe input pipe 74, the cooling water pipe output pipe 73 and the cooling water pipe input pipe 74 are arranged in the cooling water groove 75, a heat insulation pad 76 is arranged between the cooling water pipe output pipe 73 and the cooling water pipe input pipe 74, the inner ends of the cooling water pipe output pipe 73 and the cooling water pipe input pipe 74 are communicated, the front half of the cooling water pipe 71 is the cooling water pipe input pipe 74, and the rear half of the cooling water pipe 71 is the cooling water pipe output pipe 73.

[0026] The pipe expanding mechanism 7 is in an arc shape and matches the arc-shaped guide pipe 5.

[0027] The core rod inner support 77 supports the horn-shaped core rod 72 and increases the strength, and facilitates the arrangement of the cooling mechanism on the inner side of the pipe expanding mechanism 7. The front end of the horn-shaped core rod 72 is in a spherical structure, facilitating the insertion into the elbow, the middle section is an expanding section, the diameter gradually increases, the tail end is a connecting section, and the connecting section is connected with the bendable push rod 9. The part of the cooling water pipe output pipe 73 and the cooling water pipe input pipe 74 located on the outer side of the horn-shaped core rod 72 is located in the connecting section.

[0028] The cooling water pipe input pipe 74 is located on the outer side of the cooling water groove 75, and the cooling water pipe output pipe 73 is located on the inner side of the cooling water groove. The cooling water pipe input pipe 74 inputs cold water for heat exchange, the hot water after heat exchange flows out through the cooling water pipe output pipe 73, and the heat insulation pad 76 is arranged between the two pipes, so that the heat in the cooling water pipe output pipe 73 is prevented from being transmitted to the cooling water pipe input pipe 74, and the heat exchange efficiency is improved.

[0029] The long groove 12 allows the cooling pipe to move back and forth with the horn-shaped core rod 72, so that the continuous and active internal cooling in the dynamic working process is realized.

[0030] The number of the mounting rings 41 and the elbow placing pipes 11 is two, and the two elbow placing pipes 11 and the two mounting rings 41 are connected through the connecting blocks and the bolts and nuts.

[0031] The elbow to be expanded is placed in the elbow placing pipe 11, and then the upper and lower elbow placing pipes 11 and the upper and lower mounting rings 41 are connected through the bolts and nuts. The method is convenient for the placing and taking of the elbow, is convenient to assemble and disassemble, and more importantly, the overall rigidity and stability of the equipment when bearing the great pipe expanding radial force are enhanced, and the mold is prevented from cracking.

[0032] Each limiting rod 42 can be radially positioned at the elbow end under the action of spring 43, so that the elbow is located on the axis of the elbow placement pipe 11, thereby making the wall thickness of the variable diameter elbow change uniformly and preventing the situation that one side is thicker and the other side is thinner at the same position.

[0033] A set of end plates 44, springs 43 and limiting rods 42 are arranged at the lowermost end of the mounting ring 41 at the lower end, which are used to balance the gravity of the elbow, ensure that the position of the elbow is in the middle position of the elbow placement pipe 11, and make the position of the elbow correspond to the pipe expanding mechanism 7, so as to complete the pipe expanding with uniform wall thickness change.

[0034] The structure of the end plate 44, spring 43 and limiting rod 42 can be adjusted in number and position according to actual conditions.

[0035] The elbow placement pipe 11 is an arc structure, the arc of the arc-shaped guide pipe 5 and the elbow placement pipe 11 is the same and the centers of the axes coincide, a forming cavity is arranged in the elbow placement pipe 11, the forming cavity corresponds to the middle section of the horn-shaped mandrel 72, the positioning mechanism 4 is arranged at one end of the large diameter of the forming cavity, and the half-ring-shaped baffle 3 is installed at one end of the small diameter of the forming cavity of the elbow placement pipe 11.

[0036] The arc of the arc-shaped guide pipe 5 and the elbow placement pipe 11 is concentrically designed, which, in combination with the bendable push rod 9 and the guide pipe 6, ensures that the pipe expanding force is accurately transmitted along the tangent direction of the elbow axis.

[0037] The forming cavity cooperates with the horn-shaped mandrel 72 to expand the elbow into a target shape.

[0038] The inner diameter of the half-ring-shaped baffle 3 is smaller than the small diameter of the forming cavity and larger than the inner diameter of the elbow.

[0039] The purpose of the inner diameter of the half-ring-shaped baffle 3 being smaller than the small diameter of the forming cavity is to enable the half-ring-shaped baffle 3 to contact the end face of the elbow and form a limit, and the purpose of the inner diameter being larger than the inner diameter of the elbow is to prevent the inside of the half-ring-shaped baffle 3 from blocking the passage of the pipe expanding mechanism 7.

[0040] The hydraulic cylinder 8 is further included, the telescopic end of the hydraulic cylinder 8 is fixedly connected with the push block 2, the right side of the push block 2 is fixedly connected with the left side of the bendable push rod 9, the bottom of the fixed end of the hydraulic cylinder 8 and the bottom of the elbow placement pipe 11 and the arc-shaped guide pipe 5 are fixedly connected with the cushion block 10, and the bottom of the cushion block 10 is fixedly connected with the top of the workbench 1.

[0041] The heating coil structure (a conventional structure, not shown in the figure) can be arranged outside the elbow pipe 11 to heat the elbow pipe, and the heating treatment can increase the plastic deformation capacity and avoid cracking and other phenomena during processing. After the heating is completed, the hydraulic cylinder 8 is controlled to extend, and under the action of the push block 2, the bendable push rod 9 is pushed to move along the guide pipe 6 and the arc-shaped guide pipe 5 in turn, and in this process, the bendable push rod 9 pushes the pipe expanding mechanism 7 to move along the arc-shaped guide pipe 5, and finally the horn-shaped mandrel 72 expands the pipe.

[0042] After the pipe expanding is completed, the external pump is opened, water or cooling liquid is delivered into the cooling water pipe 71 to cool the elbow pipe, and the cooling water tank 75, the cooling water pipe output pipe 73 and the cooling water pipe input pipe 74 cooperate to realize the purpose that the cooling pipeline follows the reciprocating movement of the mandrel and the circulating flow of the cooling medium.

[0043] The operation steps of the present application are as follows:

[0044] A. Place the elbow pipe to be expanded into the elbow pipe placing pipe 11, and then connect the upper and lower elbow pipe placing pipes 11 and the upper and lower mounting rings 41 through bolts and nuts;

[0045] B. The spring 43 can make each limiting rod 42 radially limit the end of the elbow pipe, so that the wall thickness of the variable diameter elbow pipe changes uniformly;

[0046] C. The heating coil structure arranged outside the elbow pipe placing pipe 11 is used to heat the elbow pipe until the elbow pipe reaches the set temperature, and then the hydraulic cylinder 8 is controlled to extend, and under the action of the push block 2, the bendable push rod 9 is pushed to move along the guide pipe 6 and the arc-shaped guide pipe 5 in turn, and in this process, the bendable push rod 9 pushes the pipe expanding mechanism 7 to move along the arc-shaped guide pipe 5, and finally the horn-shaped mandrel 72 expands the pipe;

[0047] D. After the pipe expanding is completed, the external pump is opened, water or cooling liquid is delivered into the cooling water pipe 71 to cool the elbow pipe, and the cooling water tank 75, the cooling water pipe output pipe 73 and the cooling water pipe input pipe 74 cooperate to realize the purpose that the cooling pipeline follows the reciprocating movement of the mandrel and the circulating flow of the cooling medium.

[0048] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A pipe expanding apparatus for large reducing bends, comprising a work table (1), characterized in that: The right end of the top of the workbench (1) is equipped with an arc-shaped guide pipe (5), and the right side of the arc-shaped guide pipe (5) is in contact with a elbow placing pipe (11), the left side of the arc-shaped guide pipe (5) is fixedly connected with a guide pipe (6), and the inner side of the guide pipe (6) is placed with a bendable push rod (9), the right side of the bendable push rod (9) is fixedly connected with an expansion pipe mechanism (7), the expansion pipe mechanism (7) comprises a horn-shaped mandrel (72), the inner side of the horn-shaped mandrel (72) is fixedly connected with a mandrel inner support (77), and the outer surface of the mandrel inner support (77) is equipped with a cooling mechanism, the surface of the elbow placing pipe (11) is equipped with a positioning mechanism (4), the positioning mechanism (4) comprises a mounting ring (41), the outer side of the mounting ring (41) is fixedly connected with a plurality of equally angularly distributed springs (43), the ends of the springs (43) are fixedly connected with end plates (44), the inner side of the end plates (44) is fixedly connected with limit rods (42), and the inner ends of the limit rods (42) penetrate through the mounting ring (41) and the elbow placing pipe (11).

2. A pipe expanding apparatus for use with a large reducing bend according to claim 1, characterized in that: The cooling mechanism comprises a mandrel inner support (77), a spiral-shaped distribution cooling water groove (75) is formed in the outer side of the mandrel inner support (77), a cooling water pipe (71) is placed in the inner side of the cooling water groove (75), a long groove (12) is formed in the connecting position of the arc-shaped guide pipe (5) and the cooling water pipe (71), the cooling water pipe (71) is a double-layer circulating water pipe, the cooling water pipe (71) comprises a cooling water pipe output pipe (73) and a cooling water pipe input pipe (74), the cooling water pipe output pipe (73) and the cooling water pipe input pipe (74) are arranged in the cooling water groove (75), a heat insulation pad (76) is arranged between the cooling water pipe output pipe (73) and the cooling water pipe input pipe (74), the inner ends of the cooling water pipe output pipe (73) and the cooling water pipe input pipe (74) are communicated, and the front half of the cooling water pipe (71) is the cooling water pipe input pipe (74), and the rear half is the cooling water pipe output pipe (73).

3. A pipe expanding apparatus for use with a large reducing elbow as defined in claim 1, wherein: The number of the mounting ring (41) and the elbow placing pipe (11) is two, and the two elbow placing pipes (11) and the two mounting rings (41) are connected through connecting blocks and bolts and nuts.

4. A pipe expanding apparatus for use with a large reducing bend according to claim 3, wherein: A group of end plates (44), springs (43) and limit rods (42) are arranged on the surface of the mounting ring (41) at the lower end.

5. The pipe expanding apparatus for use with a reducing elbow as defined in claim 1 wherein: The elbow placing pipe (11) is an arc-shaped structure, the arc degrees of the arc-shaped guide pipe (5) and the elbow placing pipe (11) are the same, and the axis centers coincide, a forming cavity is formed in the elbow placing pipe (11), the forming cavity corresponds to the middle section of the horn-shaped mandrel (72), the positioning mechanism (4) is arranged at the large-diameter end of the forming cavity, and a semi-annular baffle (3) is arranged at the small-diameter end of the forming cavity of the elbow placing pipe (11).

6. A pipe expanding apparatus for use with a reducing elbow according to claim 5, wherein: The inner diameter of the semi-annular baffle (3) is smaller than the small diameter of the forming cavity and larger than the inner diameter of the elbow.

7. The pipe expanding apparatus for use with a reducing elbow as defined in claim 1 wherein: Also include hydraulic cylinder (8), the telescopic end of the hydraulic cylinder (8) is fixedly connected with push block (2), the right side of push block (2) is fixedly connected with the left side of bendable push rod (9), the bottom of the fixed end of hydraulic cylinder (8) and the bottom of elbow placement pipe (11) and arc-shaped conduit (5) are fixedly connected with pad (10), and the bottom of pad (10) is fixedly connected with the top of workbench (1).

Images