Straightening structure of large pipe contracting machine and large pipe contracting machine using same

Abstract

The invention relates to the technical field of pipe contracting machines, and discloses a straightening structure of a large pipe contracting machine and the large pipe contracting machine using the straightening structure. The straightening structure comprises a bottom plate, two adjusting assemblies, two supporting assemblies and a plurality of positioning assemblies; a first sliding groove, a second sliding groove, a third sliding groove and a fourth sliding groove are formed in the side face of the bottom plate, the two supporting assemblies are used for supporting the bottom plate, a straight-through hole is formed in the middle of the bottom plate and used for keeping away from a machined pipe fitting, and the multiple positioning assemblies are arranged in the circumferential direction of the straight-through hole at equal intervals. The first sliding groove, the second sliding groove, the third sliding groove and the fourth sliding groove are formed in the periphery of the bottom plate and matched with the two active adjusting assemblies and the two elastic supporting assemblies, an adjusting matrix with the self-locking and dynamic balancing capacity is constructed, and the problem that in the diameter reducing process of large pipes, due to the dead weight or machining deviation, the axial lead deviates is solved.

Description

Technical Field

[0001] This invention relates to the field of tube shrinking machine technology, and more particularly to a straightening structure for a large tube shrinking machine and a large tube shrinking machine using the same. Background Technology

[0002] Tube shrinking machines are key processing equipment in the field of electric heating element manufacturing. They are mainly used to radially compress metal tubes containing heating wires and insulating media, such as magnesium oxide powder. This equipment uses multiple sets of rollers with different die shapes to continuously roll the tube. The compressive stress generated by the radial contraction of the metal tube ensures that the magnesium oxide powder filling the tube reaches a predetermined density. This significantly improves the thermal conductivity and electrical insulation performance of the electric heating element while ensuring the geometric accuracy of the tube.

[0003] With the increasing demand for ultra-long, large-diameter, and high-power-density heating elements in the energy, chemical, and heavy machinery sectors, the scaling up of tube shrinking machines has become a core direction of technological development. Large-scale tube shrinking machines, by increasing the number of rolling mill stations and strengthening the rigidity of the frame, can handle larger-sized thick-walled tubes and provide stronger compaction power to meet the extremely high density consistency requirements of the internal medium of the heating tube under complex working conditions, thereby enabling large-scale, highly standardized production of industrial-grade electric heating elements.

[0004] However, with the scaling up of tube shrinking machines, the rolling pressure output by large equipment is extremely high. In particular, when the two ends of the tube leave the roll set, the force balance state will change drastically and instantaneously. Due to the continuous constraint of leaving the rolls, the tube ends are prone to axial deviation under extremely high radial extrusion. Moreover, the deformation direction is affected by multiple factors such as the micro-inhomogeneity of the material and the tangential force of the rolls, and can point to any direction. Deformation not only reduces the dimensional accuracy of the tube ends and affects the yield of finished products, but may also cause subsequent processes to be unable to connect normally. Summary of the Invention

[0005] To address the aforementioned shortcomings, the present invention aims to provide a straightening structure for a large-scale tube shrinking machine and a large-scale tube shrinking machine using the same, thereby solving the problem of tube end deformation after the tube shrinking machine is enlarged.

[0006] To achieve this objective, the present invention adopts the following technical solution: A straightening structure for a large tube shrinking machine includes a base plate, two adjusting components, two supporting components, and several positioning components. The surface of the base plate is arranged along the XY plane, and the side of the base plate is provided with a first slide groove, a second slide groove, a third slide groove, and a fourth slide groove. The length direction of the first slide groove and the third slide groove is both arranged along the X direction, and the first slide groove and the third slide groove are arranged opposite to each other on both sides of the base plate along the Y direction. The length direction of the second slide groove and the fourth slide groove is both arranged along the Y direction, and the second slide groove and the fourth slide groove are arranged opposite to each other on both sides of the base plate along the X direction. One end of each adjustment component corresponds to and abuts against the first slide groove and the second slide groove respectively, and the base plate can slide along the length direction of the first slide groove and the second slide groove respectively. The two adjustment components are respectively used to adjust the position of the base plate along the X or Y direction. One side of each of the two support components corresponds to and abuts against the third slide groove and the fourth slide groove, respectively, and the base plate can slide along the length direction of the third slide groove and the fourth slide groove, respectively. The two support components are used to support the base plate along the X and Y directions, respectively. A through hole is provided in the middle of the base plate along the Z direction. The through hole is used to prevent the pipe fittings processed in the large tube shrinking machine from being exposed to air. The positioning components are spaced apart on the surface of the base plate, and a plurality of the positioning components are spaced equally apart along the circumference of the through hole.

[0007] Preferably, the adjusting assembly includes an adjusting bolt, an adjusting block, a screw support, and a pressure block. The adjusting bolt passes through the screw support, and the nut of the adjusting bolt abuts against the screw support. The length direction of the adjusting bolt corresponding to the first slide groove is set along the Y direction, and the length direction of the adjusting bolt corresponding to the second slide groove is set along the X direction. The adjusting block is provided with a threaded through hole that matches the adjusting bolt, and the adjusting block is sleeved on the adjusting bolt through the threaded through hole; the adjusting block is provided with two locking surfaces along the XY plane, and the two locking surfaces are arranged opposite to each other on the outside of the adjusting block along the Z direction; the two adjusting components respectively abut against the first slide groove or the second slide groove through the adjusting block. The pressure block is installed on the first slide groove or the second slide groove. The pressure block is provided with a first elongated hole. The length direction of the first elongated hole is respectively set along the length direction of the corresponding first slide groove or the second slide groove. The adjusting bolt passes through the first elongated hole. The pressure block is used to restrict the adjusting block in the first slide groove or the second slide groove. Both the first and second slides are double-layered slides, consisting of an upper slide and a lower slide. The adjusting block is embedded in the upper slide, and the two locking surfaces of the same adjusting block abut against the inner walls of the corresponding upper slide along its length. The lower slide is used to avoid the adjusting bolt. The base plate is provided with a support surface located between the upper and lower slides. The adjusting block abuts against the support surface. In the first slide, the support surface is arranged along the XZ plane, and in the second slide, the support surface is arranged along the YZ plane.

[0008] Preferably, the device further includes a positioning bolt and a locking nut. The positioning bolt is disposed on the screw support, and the end of the positioning bolt abuts against the adjusting bolt. The locking nut matches the adjusting bolt, and the locking nut abuts against the side of the screw support away from the nut of the adjusting bolt.

[0009] Preferably, the positioning component includes a positioning block, a mandrel, and a roller. The positioning block is connected to the base plate. The mandrel is disposed on the positioning block and close to the through hole. The axis of the mandrel is perpendicular to the axis of the through hole. The roller is rotatably mounted on the mandrel around the mandrel and is located along the Z direction. The portion of the roller is located within the projection range of the through hole.

[0010] Preferably, the mandrel is an eccentric shaft.

[0011] Preferably, the roller is detachably mounted on the mandrel.

[0012] Preferably, it also includes a bearing disposed between the mandrel and the roller.

[0013] Preferably, the positioning block is detachably connected to the base plate.

[0014] Preferably, the support assembly includes a push block, a connecting block, at least two guide rods and at least two elastic elements. The support assembly abuts against the third slide groove or the fourth slide groove via the push block. One side of the push block is provided with a protrusion, which is embedded in the third slide groove or the fourth slide groove. The guide rod is disposed on the side of the push block away from the protrusion, and the length direction of the guide rod corresponding to the third slide groove is set along the Y direction, while the length direction of the guide rod corresponding to the fourth slide groove is set along the X direction. The connecting block is provided with at least two limiting holes at intervals. The at least two limiting blocks are respectively matched with the guide rod. One end of the guide rod is embedded in its corresponding limiting hole, and the guide rod can move in the limiting hole along its length direction. The limiting hole is used for circumferential limiting of its corresponding guide rod. At least two of the elastic elements correspond one-to-one with at least two of the guide rods. The elastic element is sleeved on its corresponding guide rod. One end of the elastic element abuts against the push block, and the other end of the elastic element abuts against the connecting block. The elastic element is used to drive the push block and the connecting block away from each other.

[0015] A large tube shrinking machine includes a frame, a tube shrinking mechanism, a tube pulling mechanism, a guide tube, and the aforementioned straightening structure. The tube shrinking mechanism is located in the middle of the frame, the guide tube is located near the inlet of the tube shrinking mechanism, the tube pulling mechanism is located near the outlet of the tube shrinking mechanism, and the straightening mechanism is located between the tube pulling mechanism and the tube shrinking mechanism. The straightening mechanism is fixed to the frame by the adjusting component and the supporting component. The tube shrinking mechanism has a cylindrical processing straight cavity, and the processing straight cavity, the guide tube, and the straight through hole of the straightening structure are coaxially arranged. The tube-pulling mechanism includes a drive motor, a motor mounting bracket, a drive wheel, a driven wheel, and a wheel frame. The drive motor is mounted on the motor mounting bracket, which has a second slot. The motor mounting bracket is mounted on the frame through the second slot. The drive wheel is rotatably mounted on the rotation output part of the drive motor. The wheel frame has a third slot. The wheel frame is mounted on the frame through the third slot. The driven wheel is rotatably mounted on the wheel frame. The length directions of the second and third slots are both arranged radially along the machining cavity. The drive wheel and the driven wheel are arranged opposite each other on both sides of the radial direction of the machining cavity, and the rotation axes of the drive wheel and the driven wheel are both perpendicular to the axis of the machining cavity.

[0016] The technical solution provided by this invention may include the following beneficial effects: 1. By setting a first, second, third, and fourth sliding groove around the base plate, and cooperating with two active adjustment components and two elastic support components, an adjustment matrix with self-locking and dynamic balance capabilities in the XY plane is constructed. This structure solves the problem of axis misalignment caused by the weight of the pipe or mechanical deviation of the equipment during the diameter reduction process. Through the combination of active thrust in both X and Y directions and the restoring force of the opposite support components, micron-level fine compensation of the base plate position can be achieved, ensuring that the straight hole in the center of the base plate and the machining axis of the pipe reducing machine achieve extremely high coaxiality. At the same time, the positioning components evenly distributed around the straight hole can apply uniform pressure from all directions in the radial direction, effectively solving the vibration and eccentricity problems of the pipe during high-speed passage, and ensuring the stability of straightening from the source.

[0017] 2. The adjusting assembly employs a threaded drive combined with a double-layer slide design, precisely converting rotational motion into linear displacement, significantly improving the smoothness of adjustment. The adjusting block moves under force within the upper layer of the double-layer slide, while the lower slide provides clearance for the bolts. This structure ensures the compactness of the transmission mechanism and, by increasing the contact area between the adjusting block and the locking surface of the slide sidewall, prevents wobbling and tilting during adjustment. The design of the pressure block and the slotted hole provides Z-direction constraint to the base plate, ensuring that the base plate remains in contact with the preset plane during displacement, solving the technical problem of displacement deflection or instability that traditional adjusting mechanisms are prone to under heavy loads.

[0018] 3. The eccentric mandrel design provides a means of fine-tuning during the straightening process. Due to the eccentricity, the operator only needs to rotate the mandrel angle to change the radial distance between the roller and the axis within a very small stroke range. This solves the problem of cumulative errors caused by machining errors of the positioning components or minor wear of the roller, giving the system extremely high compensation flexibility.

[0019] 4. The detachable design and multiple interchangeable rollers give this structure excellent adaptability. By replacing rollers of different diameters, the equipment can quickly adapt to the processing needs of different pipe diameters without changing the base plate. At the same time, the use of rubber rollers provides a certain degree of elastic cushioning under high-pressure contact, further reducing damage to the surface of precision pipes, and the convenient replacement of vulnerable parts reduces long-term maintenance costs.

[0020] 5. The detachable and standardized design of the positioning blocks, together with the detachable adjustment of the rollers, forms a dual adjustment gradient. This structure greatly expands the adjustment range of the straightening device. By replacing positioning blocks of different lengths, it can achieve cross-compatibility from small-diameter civil pipes to large-diameter industrial pipes, significantly improving the return on investment and processing coverage of a single unit.

[0021] 6. A complete automated processing flow is constructed through the coordinated layout of the tube shrinking mechanism, guide tube, straightening structure, and tube pulling mechanism. The guide tube inlet limit, the straightening structure outlet fine adjustment, and the active traction of the tube pulling mechanism jointly solve the pain points of tube fittings being easily bent and difficult to discharge after tube shrinking due to the need for centering before shrinking. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a straightening structure according to an embodiment of the present invention.

[0023] Figure 2 This is a cross-sectional view of a straightening structure according to an embodiment of the present invention.

[0024] Figure 3 This is a three-dimensional structural diagram of the base plate of the straightening structure according to an embodiment of the present invention.

[0025] Figure 4 This is a three-dimensional structural diagram of the straightening structure in another direction, according to an embodiment of the present invention.

[0026] Figure 5 for Figure 2 Enlarged view of point A in the middle.

[0027] Figure 6 This is a cross-sectional view of a straightening structure according to an embodiment of the present invention.

[0028] Figure 7 for Figure 6 Enlarged view of point B in the middle.

[0029] Figure 8 for Figure 6 A magnified view of point C in the middle.

[0030] Figure 9 for Figure 1 Enlarged view of point D in the middle.

[0031] Figure 10 This is a three-dimensional structural diagram of a large tube shrinking machine according to an embodiment of the present invention.

[0032] Figure 11 This is a schematic diagram of the structure of a large tube shrinking machine according to an embodiment of the present invention.

[0033] Figure 12 for Figure 11 Enlarged view of point E in the middle.

[0034] The components include: base plate 1, upper slide groove 101, lower slide groove 102, support surface 103, first slide groove 11, second slide groove 12, third slide groove 13, fourth slide groove 14, straight through hole 15, adjusting assembly 2, adjusting bolt 21, adjusting block 22, threaded through hole 221, locking surface 222, screw support 23, pressure block 24, first elongated slot 241, support assembly 3, push block 31, protrusion 311, and connection. Block 32, limiting hole 321, guide rod 33, elastic element 34, positioning assembly 4, positioning block 41, spindle 42, roller 43, bearing 44, frame 51, tube shrinking mechanism 52, tube pulling mechanism 53, drive motor 531, motor mounting bracket 532, second strip hole 5321, driving wheel 533, driven wheel 534, wheel frame 535, third strip hole 5351, guide tube 54, straightening structure 55, pipe fitting 9. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.

[0037] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] A straightening structure for a large tube shrinking machine includes a base plate 1, two adjusting components 2, two supporting components 3, and several positioning components 4. The surface of the base plate 1 is arranged along the XY plane, and the side of the base plate 1 is provided with a first sliding groove 11, a second sliding groove 12, a third sliding groove 13, and a fourth sliding groove 14. The length direction of the first sliding groove 11 and the third sliding groove 13 is both arranged along the X direction, and the first sliding groove 11 and the third sliding groove 13 are arranged opposite to each other on both sides of the base plate 1 along the Y direction. The length direction of the second sliding groove 12 and the fourth sliding groove 14 is both arranged along the Y direction, and the second sliding groove 12 and the fourth sliding groove 14 are arranged opposite to each other on both sides of the base plate 1 along the X direction. One end of the adjustment component 2 corresponds to and abuts against the first slide groove 11 and the second slide groove 12 respectively, and the base plate 1 can slide along the length direction of the first slide groove 11 and the second slide groove 12 respectively. The two adjustment components 2 are respectively used to adjust the position of the base plate 1 along the X or Y direction. One side of each of the two support components 3 corresponds to and abuts against the third slide groove 13 and the fourth slide groove 14 respectively, and the base plate 1 can slide along the length direction of the third slide groove 13 and the fourth slide groove 14 respectively. The two support components 3 are used to support the base plate 1 along the X and Y directions respectively. A through hole 15 is provided in the middle of the base plate 1 along the Z direction. The through hole 15 is used to prevent the pipe fittings 9 processed in the large pipe shrinking machine from being exposed. The positioning components 4 are spaced apart on the surface of the base plate 1, and a plurality of the positioning components 4 are spaced apart at equal intervals along the circumference of the through hole 15.

[0040] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, by setting a first sliding groove 11, a second sliding groove 12, a third sliding groove 13, and a fourth sliding groove 14 around the base plate 1, and cooperating with two active adjustment components 2 and two elastic support components 3, an adjustment matrix with self-locking and dynamic balance capabilities in the XY plane is constructed. This structure solves the problem of axis offset caused by self-weight or mechanical deviation of equipment during the diameter reduction process of large pipes. Through the active thrust in both X and Y directions and the restoring force of the opposite support components 3, micron-level fine compensation of the position of the base plate 1 can be achieved, ensuring that the straight hole 15 in the center of the base plate 1 and the processing axis of the pipe reducing machine achieve extremely high coaxiality. At the same time, the positioning components 4, which are evenly distributed around the straight hole 15, can apply uniform pressure from all directions in the radial direction, effectively solving the vibration and eccentricity problems of the pipe 9 during high-speed passage, and ensuring the stability of straightening from the source.

[0041] Specifically, the large tube shrinking machine is equipped with a frame 51. The other end of the adjusting component 2 is fixed to the frame 51, and the other side of the supporting component 3 is fixed to the frame 51. The X, Y, and Z directions are three mutually perpendicular directions, with the Z direction parallel to the axis of the tube being processed 9. The position of the base plate 1 along the X and Y directions is adjusted by the two adjusting components 2 respectively, and it is supported by the two supporting components 3, so that the base plate 1 can be adjusted and moved in the XY plane, so that the through hole 15 can be precisely coaxial with the tube being processed 9, and the tube 9 is radially supported and straightened by several positioning components 4.

[0042] Preferably, the adjusting assembly 2 includes an adjusting bolt 21, an adjusting block 22, a screw support 23, and a pressure block 24. The adjusting bolt 21 passes through the screw support 23, and the nut of the adjusting bolt 21 abuts against the screw support 23. The length direction of the adjusting bolt 21 corresponding to the first slide groove 11 is arranged along the Y direction, and the length direction of the adjusting bolt 21 corresponding to the second slide groove 12 is arranged along the X direction. The adjusting block 22 is provided with a threaded through hole 221 that matches the adjusting bolt 21. The adjusting block 22 is sleeved on the adjusting bolt 21 through the threaded through hole 221. The adjusting block 22 is provided with two locking surfaces 222 along the XY plane. The two locking surfaces 222 are arranged opposite to each other on the outer side of the adjusting block 22 along the Z direction. The two adjusting components 2 respectively abut against the first slide groove 11 or the second slide groove 12 through the adjusting block 22. The pressure block 24 is installed over the first slide groove 11 or the second slide groove 12. The pressure block 24 is provided with a first elongated hole 241. The length direction of the first elongated hole 241 is respectively arranged along the length direction of the corresponding first slide groove 11 or the second slide groove 12. The adjusting bolt 21 passes through the first elongated hole 241. The pressure block 24 is used to restrict the adjusting block 22 in the first slide groove 11 or the second slide groove 12. Both the first slide groove 11 and the second slide groove 12 are double-layer slide grooves, which are divided into an upper slide groove 101 and a lower slide groove 102. The adjusting block 22 is embedded in the upper slide groove 101, and the two locking surfaces 222 of the same adjusting block 22 respectively abut against the inner walls of the corresponding upper slide groove 101 along its length direction. The lower slide groove 102 is used to avoid the adjusting bolt 21. The base plate is provided with a support surface 103, which is located between the upper slide groove 101 and the lower slide groove 102. The adjusting block 22 abuts against the support surface 103. The support surface 103 in the first slide groove 11 is arranged along the XZ plane, and the support surface 103 in the second slide groove 12 is arranged along the YZ plane.

[0043] Specifically, the screw support 23 is fixed to the frame 51. By rotating the adjusting bolts 21 of the two adjusting components 2 respectively, the adjusting block 22 moves relative to the length of the adjusting bolt 21. When the adjusting block 22 moves, it pushes the base plate 1 to move together through the support surface 103, so as to accurately adjust the position of the base plate 1 along the XY plane.

[0044] like Figure 5 , Figure 6 and Figure 7As shown, the adjusting component 2 employs a threaded drive combined with a double-layer slide groove design, precisely converting rotational motion into linear displacement, significantly improving the smoothness of adjustment. The adjusting block 22 moves under force within the upper layer of the double-layer slide groove, while the lower slide groove 102 provides clearance for the bolt. This structure ensures the compactness of the transmission mechanism and, by increasing the contact area between the adjusting block 22 and the slide groove sidewall (locking surface 222), prevents shaking and tilting during adjustment. The design of the pressure block 24 and the strip hole provides Z-direction constraint for the base plate 1, ensuring that the base plate 1 remains in contact with the preset plane during displacement, solving the technical problem of displacement deflection or instability that traditional adjusting mechanisms are prone to under heavy loads.

[0045] Preferably, it further includes a positioning bolt and a locking nut. The positioning bolt is disposed on the screw support 23, and the end of the positioning bolt abuts against the adjusting bolt 21. The locking nut matches the adjusting bolt 21, and the locking nut abuts against the side of the screw support 23 away from the nut of the adjusting bolt 21.

[0046] The dual locking mechanism of the positioning bolt (not shown in the figure) and the locking nut (not shown in the figure) solves the problem of creep or loosening of the adjusting bolt 21 under long-term high-frequency vibration conditions. The positioning bolt achieves physical limitation through end abutment, and the locking nut eliminates thread clearance through preload. The two work together to ensure that once the straightening structure completes accuracy compensation, it can maintain long-term positioning accuracy, greatly reducing the frequency of manual re-inspection and repeated calibration. When adjustment is needed, the positioning bolt and locking nut can be loosened, and the adjusting bolt 21 can be rotated to adjust the position of the base plate 1.

[0047] Preferably, the positioning component 4 includes a positioning block 41, a spindle 42, and a roller 43. The positioning block 41 is connected to the base plate 1. The spindle 42 is disposed on the positioning block 41 and close to the through hole 15. The axis of the spindle 42 is perpendicular to the axis of the through hole 15. The roller 43 is rotatably mounted on the spindle 42 around the spindle 42 and is partially located within the projection range of the through hole 15 along the Z direction.

[0048] like Figure 8 As shown, the positioning component 4 utilizes a combination of positioning block 41, spindle 42, and roller 43 to transform traditional sliding friction into rolling friction, effectively solving the problem of excessive positioning resistance during straightening. The roller 43 is partially projected within the through hole 15, forming multiple support points that can stably bear the radial load of the large pipe fitting 9, ensuring straightening accuracy while protecting the surface quality of the pipe fitting 9.

[0049] Preferably, the mandrel 42 is an eccentric shaft.

[0050] Specifically, the eccentricity of the spindle 42 is 2mm. By rotating the spindle 42, the distance between the roller 43 and the axis of the through hole 15 can be finely adjusted.

[0051] The mandrel 42, with its eccentric design, provides a means of fine-tuning during the straightening process. Due to the eccentricity, the operator only needs to rotate the mandrel 42 to change the radial distance between the roller 43 and the axis within a very small stroke range. This solves the problem of cumulative errors caused by machining errors of the positioning component 4 or minor wear of the roller 43, giving the system extremely high compensation flexibility.

[0052] Preferably, the roller 43 is detachably mounted on the spindle 42.

[0053] Specifically, the roller 43 has multiple specifications with different diameters. The roller is rotatably sleeved on the mounting shaft, and the mounting shaft and the roller on it are installed on the positioning block by bolts. The rollers 43 installed at the same time in several positioning components 4 have the same diameter. The roller 43 is made of rubber to avoid scratching the pipe fitting 9. The detachable structure makes it easy to replace the roller 43 after it wears out.

[0054] The detachable design and multiple interchangeable sizes of rollers 43 give this structure excellent adaptability. By replacing rollers 43 with different diameters, the equipment can quickly adapt to the processing needs of different pipe diameters without replacing the base plate 1. At the same time, the use of rubber rollers provides a certain degree of elastic cushioning under high pressure contact, further reducing damage to the surface of precision pipes, and the convenient replacement of vulnerable parts reduces the long-term maintenance costs of the equipment.

[0055] Preferably, it also includes a bearing 44, which is disposed between the spindle 42 and the roller 43.

[0056] The bearing 44 further optimizes the smoothness of the roller 43's rotation and reduces frictional resistance.

[0057] Preferably, the positioning block 41 is detachably connected to the base plate 1.

[0058] Specifically, the positioning block 41 has multiple specifications of different lengths. The positioning block 41 is locked to the base plate 1 by several bolts. The length direction of the positioning block 41 is set radially along the through hole 15. The positioning blocks 41 installed in several positioning components 4 at the same time all have the same length.

[0059] The detachable and standardized design of the positioning block 41, together with the detachable adjustment of the roller 43, forms a dual adjustment gradient. This structure greatly expands the adjustment range of the straightening device. By replacing the positioning block 41 with different lengths, it can achieve cross-compatibility from small-diameter civil pipes to large-diameter industrial pipes, significantly improving the return on investment and processing coverage of a single unit.

[0060] Preferred, such as Figure 9 As shown, the support assembly 3 includes a push block 31, a connecting block 32, at least two guide rods 33 and at least two elastic elements 34. The support assembly 3 abuts against the third slide groove 13 or the fourth slide groove 14 through the push block 31. A protrusion 311 is provided on one side of the push block 31, and the protrusion 311 is embedded in the third slide groove 13 or the fourth slide groove 14. The guide rod 33 is disposed on the side of the push block 31 away from the protrusion 311, and the length direction of the guide rod 33 corresponding to the third slide groove 13 is arranged along the Y direction, and the length direction of the guide rod 33 corresponding to the fourth slide groove 14 is arranged along the X direction. The connecting block 32 is provided with at least two limiting holes 321 at intervals. At least two limiting blocks are respectively matched with the guide rod 33. One end of the guide rod 33 is embedded in its corresponding limiting hole 321, and the guide rod 33 can move in the limiting hole 321 along its length direction. The limiting hole 321 is used for circumferential limiting of its corresponding guide rod 33. At least two of the elastic elements 34 correspond one-to-one with at least two of the guide rods 33. The elastic element 34 is sleeved on its corresponding guide rod 33. One end of the elastic element 34 abuts against the push block 31, and the other end of the elastic element 34 abuts against the connecting block 32. The elastic element 34 is used to drive the push block 31 and the connecting block 32 away from each other.

[0061] Specifically, the connecting block 32 is fixed to the frame 51, and the elastic element 34 is a compression spring. The spring supports the push block 31, the push block 31 supports the base plate 1, and the adjustment mechanism clamps the base plate 1.

[0062] The support assembly 3 uses the guide rod 33 and the elastic element 34 to provide a continuous flexible pressure to the base plate 1. This ensures that the direction of the supporting force on the guide rod 33 during its reciprocating motion within the limiting hole 321 remains stable, preventing the base plate 1 from tipping over or getting stuck during XY plane adjustment.

[0063] like Figure 10 As shown, a large tube shrinking machine includes a frame 51, a tube shrinking mechanism 52, a tube pulling mechanism 53, a guide tube 54, and the aforementioned straightening structure 55. The tube shrinking mechanism 52 is located in the middle of the frame 51. The guide tube 54 is located near the inlet of the tube shrinking mechanism 52, and the tube pulling mechanism 53 is located near the outlet of the tube shrinking mechanism 52. The straightening mechanism 55 is located between the tube pulling mechanism 53 and the tube shrinking mechanism 52. The straightening mechanism 55 is fixed to the frame 51 by the adjusting component 2 and the supporting component 3. The tube shrinking mechanism 52 is provided with a cylindrical processing straight cavity. The processing straight cavity, the guide tube 54, and the straight through hole 15 of the straightening structure 55 are coaxially arranged. like Figure 11 and Figure 12 As shown, the tube-pulling mechanism 53 includes a drive motor 531, a motor mounting bracket 532, a drive wheel 533, a driven wheel 534, and a wheel frame 535. The drive motor 531 is mounted on the motor mounting bracket 532. The motor mounting bracket 532 has a second strip-shaped hole 5321, through which it is mounted on the frame 51. The drive wheel 533 is rotatably mounted on the rotation output part of the drive motor 531. The wheel frame 535 has a third strip-shaped hole 5321. The wheel frame 535 is mounted on the machine frame 51 through the third strip-shaped hole 5351. The driven wheel 534 is rotatably mounted on the wheel frame 535. The length directions of the second strip-shaped hole 5321 and the third strip-shaped hole 5351 are both arranged radially along the machining cavity. The driving wheel 533 and the driven wheel 534 are arranged opposite each other on both sides of the radial direction of the machining cavity, and the rotation axes of the driving wheel 533 and the driven wheel 534 are both perpendicular to the axis of the machining cavity.

[0064] The tube pulling mechanism 53 can easily adjust the distance between the driving wheel 533 and the driven wheel 534 and the axis of the processing straight cavity, so as to achieve precise matching between the traction force and the tube diameter, and ensure that the tube 9 is pulled out with uniform force and no slippage, thereby further improving the processing efficiency of the whole machine and the straightness of the finished product.

[0065] The conduit 54 circumferentially limits the fitting 9 at the inlet end, the straightening structure 55 circumferentially limits and straightens the fitting 9 at the outlet end, and the tube pulling mechanism 53 assists in pulling the fitting 9 out.

[0066] The coordinated layout of the tube shrinking mechanism 52, the guide tube 54, the straightening structure 55, and the tube pulling mechanism 53 constructs a complete automated processing flow. The inlet limit of the guide tube 54, the outlet fine adjustment of the straightening structure 55, and the active traction of the tube pulling mechanism 53 jointly solve the pain points of the tube fitting 9 being easily bent and difficult to discharge after tube shrinking due to the need for centering before shrinking.

[0067] Other configurations and operations according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0068] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A straightening structure for a large tube shrinking machine, characterized in that: The device includes a base plate, two adjusting components, two supporting components, and several positioning components. The surface of the base plate is arranged along the XY plane, and the side of the base plate is provided with a first sliding groove, a second sliding groove, a third sliding groove, and a fourth sliding groove. The length direction of the first sliding groove and the third sliding groove is both arranged along the X direction, and the first sliding groove and the third sliding groove are arranged opposite to each other on both sides of the base plate along the Y direction. The length direction of the second sliding groove and the fourth sliding groove is both arranged along the Y direction, and the second sliding groove and the fourth sliding groove are arranged opposite to each other on both sides of the base plate along the X direction. One end of each adjustment component corresponds to and abuts against the first slide groove and the second slide groove respectively, and the base plate can slide along the length direction of the first slide groove and the second slide groove respectively. The two adjustment components are respectively used to adjust the position of the base plate along the X or Y direction. One side of each of the two support components corresponds to and abuts against the third slide groove and the fourth slide groove, respectively, and the base plate can slide along the length direction of the third slide groove and the fourth slide groove, respectively. The two support components are used to support the base plate along the X and Y directions, respectively. A through hole is provided in the middle of the base plate along the Z direction. The through hole is used to prevent the pipe fittings processed in the large tube shrinking machine from being exposed to air. The positioning components are spaced apart on the surface of the base plate, and a plurality of the positioning components are spaced equally along the circumference of the through hole.

2. The straightening structure of a large tube shrinking machine according to claim 1, characterized in that: The adjustment assembly includes an adjustment bolt, an adjustment block, a screw support, and a pressure block. The adjustment bolt passes through the screw support, and the nut of the adjustment bolt abuts against the screw support. The length direction of the adjustment bolt corresponding to the first slide groove is set along the Y direction, and the length direction of the adjustment bolt corresponding to the second slide groove is set along the X direction. The adjusting block is provided with a threaded through hole that matches the adjusting bolt, and the adjusting block is sleeved on the adjusting bolt through the threaded through hole; the adjusting block is provided with two locking surfaces along the XY plane, and the two locking surfaces are arranged opposite to each other on the outside of the adjusting block along the Z direction; the two adjusting components respectively abut against the first slide groove or the second slide groove through the adjusting block. The pressure block is installed on the first slide groove or the second slide groove. The pressure block is provided with a first elongated hole. The length direction of the first elongated hole is respectively set along the length direction of the corresponding first slide groove or the second slide groove. The adjusting bolt passes through the first elongated hole. The pressure block is used to restrict the adjusting block in the first slide groove or the second slide groove. Both the first and second slides are double-layered slides, consisting of an upper slide and a lower slide. The adjusting block is embedded in the upper slide, and the two locking surfaces of the same adjusting block abut against the inner walls of the corresponding upper slide along its length. The lower slide is used to avoid the adjusting bolt. The base plate is provided with a support surface located between the upper and lower slides. The adjusting block abuts against the support surface. In the first slide, the support surface is arranged along the XZ plane, and in the second slide, the support surface is arranged along the YZ plane.

3. The straightening structure of a large tube shrinking machine according to claim 2, characterized in that: It also includes a positioning bolt and a locking nut. The positioning bolt is disposed on the screw support, and the end of the positioning bolt abuts against the adjusting bolt. The locking nut matches the adjusting bolt, and the locking nut abuts against the side of the screw support away from the nut of the adjusting bolt.

4. The straightening structure of a large tube shrinking machine according to claim 1, characterized in that: The positioning assembly includes a positioning block, a mandrel, and a roller. The positioning block is connected to the base plate. The mandrel is disposed on the positioning block and close to the through hole. The axis of the mandrel is perpendicular to the axis of the through hole. The roller is rotatably mounted on the mandrel around the mandrel and is located along the Z direction. The portion of the roller is located within the projection range of the through hole.

5. The straightening structure of a large tube shrinking machine according to claim 4, characterized in that: The mandrel is an eccentric shaft.

6. The straightening structure of a large tube shrinking machine according to claim 4, characterized in that: The roller is detachably mounted on the spindle.

7. The straightening structure of a large tube shrinking machine according to claim 4, characterized in that: It also includes a bearing disposed between the mandrel and the roller.

8. The straightening structure of a large tube shrinking machine according to claim 4, characterized in that: The positioning block is detachably connected to the base plate.

9. The straightening structure of a large tube shrinking machine according to claim 1, characterized in that: The support assembly includes a push block, a connecting block, at least two guide rods, and at least two elastic elements. The support assembly abuts against the third or fourth slide groove via the push block. A protrusion is provided on one side of the push block, and the protrusion is embedded in the third or fourth slide groove. The guide rod is disposed on the side of the push block away from the protrusion, and the length direction of the guide rod corresponding to the third slide groove is set along the Y direction, while the length direction of the guide rod corresponding to the fourth slide groove is set along the X direction. The connecting block is provided with at least two limiting holes at intervals. The at least two limiting blocks are respectively matched with the guide rod. One end of the guide rod is embedded in its corresponding limiting hole, and the guide rod can move in the limiting hole along its length direction. The limiting hole is used for circumferential limiting of its corresponding guide rod. At least two of the elastic elements correspond one-to-one with at least two of the guide rods. The elastic element is sleeved on its corresponding guide rod. One end of the elastic element abuts against the push block, and the other end of the elastic element abuts against the connecting block. The elastic element is used to drive the push block and the connecting block away from each other.

10. A large-scale tube shrinking machine, characterized in that: The device includes a frame, a tube shrinking mechanism, a tube pulling mechanism, a guide tube, and a straightening structure as described in any one of claims 1-9. The tube shrinking mechanism is located in the middle of the frame, the guide tube is located near the inlet of the tube shrinking mechanism, the tube pulling mechanism is located near the outlet of the tube shrinking mechanism, the straightening mechanism is located between the tube pulling mechanism and the tube shrinking mechanism, and the straightening mechanism is fixed to the frame by the adjusting component and the supporting component. The tube shrinking mechanism has a cylindrical processing straight cavity, and the processing straight cavity, the guide tube, and the straight through hole of the straightening structure are coaxially arranged. The tube-pulling mechanism includes a drive motor, a motor mounting bracket, a drive wheel, a driven wheel, and a wheel frame. The drive motor is mounted on the motor mounting bracket, which has a second slot. The motor mounting bracket is mounted on the frame through the second slot. The drive wheel is rotatably mounted on the rotation output part of the drive motor. The wheel frame has a third slot. The wheel frame is mounted on the frame through the third slot. The driven wheel is rotatably mounted on the wheel frame. The length directions of the second and third slots are both arranged radially along the machining cavity. The drive wheel and the driven wheel are arranged opposite each other on both sides of the radial direction of the machining cavity, and the rotation axes of the drive wheel and the driven wheel are both perpendicular to the axis of the machining cavity.

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