Method and apparatus for press fitting a winding pipe sub-assembly

Abstract

The application relates to the technical field of winding pipe manufacturing, in particular to a winding pipe subassembly pressing method and device; the winding pipe subassembly pressing method comprises the following steps: vertically placing a winding pipe body and a reinforcing ring in a ring-shaped pressing gap of a pressing unit, and arranging the reinforcing ring on the outer circumferential side of the bottom of the winding pipe body; controlling a positioning unit to position the winding pipe body; based on the completion of the positioning of the winding pipe, controlling an expanding die to expand and controlling a closing die to close, so that the reinforcing ring is pressed and fixed on the outer circumferential side of the bottom of the winding pipe body, and a winding pipe subassembly is formed; thus, the problems of poor assembly efficiency and stability when the winding pipe body and the reinforcing ring are pressed are solved.

Description

Technical Field

[0001] This application relates to the field of spiral wound tube manufacturing technology, and more specifically, to a method and apparatus for press-fitting a spiral wound tube sub-assembly. Background Technology

[0002] Bellows assemblies, also known as metal hoses, are mostly used for connecting exhaust pipes and mufflers, serving as a buffer and vibration damping mechanism. A bellows assembly includes a spiral wound tube and a bellows tube, with the spiral wound tube encased in a bellows structure. The spiral wound tube typically consists of a spiral wound tube body and a reinforcing ring. The spiral wound tube body is formed by spirally winding S-shaped steel strips, with adjacent coils interlocked to form a flexible tubular body. The reinforcing ring is fitted onto the end of the spiral wound tube body with an interference fit to the outer circumference of the tube, thereby increasing the structural rigidity of the pipe end and preventing deformation under external loads. The assembly of the spiral wound tube body and the reinforcing ring is generally achieved using a specialized press-fitting device.

[0003] However, the spiral wound tube is formed by spirally winding S-shaped steel strip, and its overall structure is relatively flexible. It is prone to skewing and deformation after being placed in the pressing unit. Operators need to manually straighten and hold the spiral wound tube, which is not only inefficient, but also difficult to maintain the stable posture of the spiral wound tube throughout the pressing process. This leads to deviations in the pressing position of the reinforcing ring and the spiral wound tube, resulting in insufficient reliability. Summary of the Invention

[0004] To address the issues of poor assembly efficiency and stability during the press-fitting of the spiral wound tube and reinforcing ring, this application provides a press-fitting method and apparatus for a spiral wound tube sub-assembly.

[0005] In a first aspect, this application provides a press-fitting method for a spiral wound tube sub-assembly; the spiral wound tube sub-assembly includes a spiral wound tube body and a reinforcing ring; the press-fitting method for the spiral wound tube sub-assembly includes:

[0006] The wound tube and reinforcing ring are vertically placed in the annular pressing gap of the pressing unit, with the reinforcing ring located on the outer periphery of the bottom of the wound tube. The wound tube is formed by spirally winding a steel strip with an S-shaped cross-section. Adjacent turns of the steel strip on the wound tube are interlocked. The pressing unit includes a flaring die and a closing die. The flaring die includes multiple first pressing blocks arranged in a ring. The closing die includes multiple second pressing blocks arranged in a ring. The flaring die is located at the center of the closing die. The annular pressing gap is formed between the outer periphery of the flaring die and the inner periphery of the closing die.

[0007] The control positioning unit positions the wound tube; wherein, the positioning unit includes a pressing part and a clamping part; when the wound tube is positioned, the pressing part presses against the top of the wound tube, and the clamping part clamps against the outer peripheral wall of the wound tube;

[0008] Based on the positioning of the wound tube, the flaring die is controlled to expand and the closing die is controlled to close, so as to press and fix the reinforcing ring to the bottom outer periphery of the wound tube body, forming a wound tube sub-assembly.

[0009] Optionally, the control and positioning unit positions the wound tube body, including:

[0010] The clamping part is controlled to clamp the outer circumferential wall of the wound tube on the pressing unit in the horizontal direction;

[0011] The clamping part clamps the wound tube, and the pressing part presses the top of the wound tube vertically downward.

[0012] Optionally, in the step of the control clamping part clamping the outer circumferential wall of the winding tube on the pressing unit in the horizontal direction, the part of the clamping part clamping the winding tube is a position that is offset upward from the middle of the winding tube by a first preset distance.

[0013] Optionally, the control and positioning unit for positioning the wound tube further includes:

[0014] Based on the clamping part clamping the top of the wound tube, the clamping part is controlled to release the wound tube pressed down by the clamping part, and the cumulative release time is calculated.

[0015] Based on the release time reaching the preset time, the clamping part is controlled to clamp the outer circumferential wall of the wound tube again in the horizontal direction.

[0016] Optionally, the control and positioning unit for positioning the wound tube further includes:

[0017] Based on the fact that the top end of the wound tube is under pressure and the clamping part is in a released state from the wound tube, the clamping part is controlled to move down a second preset distance.

[0018] Optionally, the second preset distance is positively correlated with the axial length of the wound tube.

[0019] Optionally, during the expansion process of the flaring die, the flaring die moves downward;

[0020] During the closing process, the closing mold moves downwards.

[0021] Optionally, the press-fitting method for the spiral wound tube assembly further includes:

[0022] Based on the completion of the pressing of the spiral tube sub-assembly, the pressing part, the pressing unit and the clamping part are sequentially controlled to release the spiral tube sub-assembly.

[0023] Secondly, this application provides a pressing device for a spiral wound tube assembly, applied to the pressing method for the spiral wound tube assembly described in any one of the first aspects, wherein the pressing device for the spiral wound tube assembly includes:

[0024] A pressing unit includes a flaring die, a closing die, an inner guide portion, an outer guide portion, and a lifting portion; the flaring die includes a plurality of first pressing blocks arranged in a ring; the closing die includes a plurality of second pressing blocks arranged in a ring; the flaring die is located at the center of the closing die; the inner guide portion has a first conical surface; the flaring die slides against the first conical surface; the outer guide portion has a second conical surface; the closing die slides against the second conical surface; the lifting portion is vertically raised and lowered; the flaring die and the closing die are respectively radially slidably connected to the lifting portion; the inner guide portion and the outer guide portion are fixed in position; an annular pressing gap is formed between the outer peripheral side of the flaring die and the inner peripheral side of the closing die;

[0025] The positioning unit includes a pressing part and a clamping part; the pressing part is vertically movable; the clamping part includes a first clamping jaw and a second clamping jaw; the first clamping jaw and the second clamping jaw are horizontally slidable; the axis of the pressing unit is located between the first clamping jaw and the second clamping jaw.

[0026] Optionally, the diameter of the first conical surface gradually increases downwards; the diameter of the second conical surface gradually decreases downwards; the inner guide portion, the flaring die, the closing die, and the outer guide portion are arranged sequentially from the inside to the outside of the pressing unit.

[0027] To address the issues of poor assembly efficiency and stability during the press-fitting of the spiral wound tube and reinforcing ring, this application offers the following advantages:

[0028] By clamping the outer peripheral wall of the spiral wound tube with the positioning unit, automatic alignment and posture maintenance of the spiral wound tube during the press-fitting process are achieved, thereby reducing operational errors caused by manual alignment and improving press-fitting efficiency. The pressing part vertically presses down on the top of the spiral wound tube, causing the steel strips of the spiral wound tube to abut and press against each other, achieving a stable constraint on the overall structure of the spiral wound tube, thus suppressing deformation during press-fitting and ensuring press-fitting reliability. Through the coordinated action of the flaring die expanding and the closing die closing, radial press-fitting and fixing of the reinforcing ring is achieved, thereby precisely fixing the reinforcing ring to the outer peripheral side of the bottom of the spiral wound tube, ultimately solving the problems of low press-fitting efficiency and insufficient reliability of the spiral wound tube sub-assembly. Attached Figure Description

[0029] Figure 1 A flowchart of the press-fitting method for the spiral wound tube sub-assembly of Embodiment 1 is shown;

[0030] Figure 2 A simplified schematic diagram of the press-fitting device for the spiral wound tube sub-assembly of Embodiment 2 is shown;

[0031] Figure 3 An isometric view of the pressing unit of the pressing apparatus of Embodiment 2 is shown;

[0032] Figure 4 It shows Figure 3 A front view of the pressing unit of the pressing device in the middle;

[0033] Figure 5 It shows Figure 4 A cross-sectional view of the pressing unit of the pressing device in the middle;

[0034] Figure 6 An isometric view of the wound tube subassembly is shown;

[0035] Figure 7 It shows Figure 6 A cross-sectional view of the spiral wound tube subassembly.

[0036] Reference numerals: 10 for spiral wound tube assembly; 11 for spiral wound tube body; 12 for reinforcing ring; 20 for pressing device; 21 for pressing unit; 211 for flaring die; 212 for closing die; 213 for inner guide part; 2131 for first conical surface; 214 for outer guide part; 2141 for second conical surface; 215 for lifting part; 22 for positioning unit; 221 for pressing part; 222 for clamping part; 222 for first gripper; 2221 for second gripper. Detailed Implementation

[0037] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0038] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0039] Currently, it is necessary to press-fit the reinforcing ring 12 to the bottom outer periphery of the spiral wound tube 11 to form the spiral wound tube sub-assembly 10. The spiral wound tube sub-assembly 10 includes the spiral wound tube 11 and the reinforcing ring 12. The spiral wound tube 11 is formed by spirally winding a steel strip with an S-shaped cross-section. Adjacent turns of the steel strip interlock with each other, making the spiral wound tube 11 flexible and prone to deformation under external force. The reinforcing ring 12 is located on the bottom outer periphery of the spiral wound tube 11 and is interference-fitted with the inner peripheral wall of the spiral wound tube 11 to enhance the end strength. However, the spiral wound tube 11 is prone to tilting after being placed in the press-fitting unit 21, and manual straightening is inefficient and unreliable.

[0040] Example 1:

[0041] In this embodiment, a press-fitting method for the spiral wound tube assembly 10 is provided. For example... Figure 6 , Figure 7 As shown, the spiral wound tube assembly 10 includes a spiral wound tube body 11 and a reinforcing ring 12.

[0042] like Figure 1 As shown, the press-fitting method for the spiral wound tube sub-assembly 10 includes steps S10 to S30. The press-fitting method executes steps S10, S20, and S30 sequentially.

[0043] In step S10, the winding tube 11 and the reinforcing ring 12 are placed vertically in the annular pressing gap of the pressing unit 21, and the reinforcing ring 12 is positioned on the outer periphery of the bottom of the winding tube 11. This ensures that the reinforcing ring 12 is accurately positioned on the outer periphery of the bottom of the winding tube 11, thus achieving the initial positioning of the reinforcing ring 12 and the winding tube 11 before pressing. This provides the correct relative positional relationship for subsequent pressing and ensures the pressing accuracy.

[0044] The spiral wound tube 11 is formed by spirally winding a steel strip with an S-shaped cross-section. Adjacent turns of the steel strip on the spiral wound tube 11 interlock, giving it a flexible structural characteristic. This characteristic necessitates positioning and constraint during the pressing process. The pressing unit 21 includes a flaring die 211 and a closing die 212. (The text abruptly ends here.) Figure 3 , Figure 4 , Figure 5 As shown, the flaring die 211 includes a plurality of first pressing blocks arranged in a ring. The closing die 212 includes a plurality of second pressing blocks arranged in a ring. The flaring die 211 is located at the center of the closing die 212, and an annular pressing gap is formed between the outer periphery of the flaring die 211 and the inner periphery of the closing die 212. Through the annular distribution and central arrangement of the flaring die 211 and the closing die 212, an annular pressing gap is formed, realizing the circumferential force application to the wound pipe body 11 and the reinforcing ring 12, thereby making the pressing force evenly distributed along the circumferential direction, achieving the effect of ensuring the uniformity of pressing the reinforcing ring 12.

[0045] Step S20: The positioning unit 22 is controlled to position the winding tube 11. Wherein, as... Figure 2As shown, the positioning unit 22 includes a pressing part 221 and a clamping part 222. When the wound tube 11 is positioned, the pressing part 221 presses against the top of the wound tube 11, and the clamping part 222 clamps against the outer peripheral wall of the wound tube 11. It should be understood that by clamping the outer peripheral wall of the wound tube 11 with the clamping part 222 of the positioning unit 22, automatic alignment and posture maintenance of the wound tube 11 are achieved, thereby reducing operational errors caused by manual alignment and improving pressing efficiency. Simultaneously, by pressing the top of the wound tube 11 with the pressing part 221, the steel strips of the wound tube 11 are pressed together, achieving a stable constraint on the overall structure of the wound tube 11, thereby suppressing deformation of the wound tube 11 during the pressing process and ensuring the reliability of the pressing process.

[0046] In step S30, based on the completed positioning of the spiral wound tube, the flaring die 211 is expanded and the closing die 212 is closed to press-fit and fix the reinforcing ring 12 to the bottom outer periphery of the spiral wound tube body 11, forming the spiral wound tube sub-assembly 10. It should be understood that through the coordinated action of the expansion of the flaring die 211 and the closing of the closing die 212, the radial pressing and fixing of the reinforcing ring 12 is achieved, thereby accurately fixing the reinforcing ring 12 to the bottom outer periphery of the spiral wound tube body 11, achieving the effect of pressing the spiral wound tube sub-assembly 10, and ultimately solving the problems of low pressing efficiency and insufficient reliability of the spiral wound tube sub-assembly 10.

[0047] In this embodiment, the clamping part 222 of the positioning unit 22 clamps and positions the outer peripheral wall of the wound tube 11, achieving automatic alignment and posture maintenance of the wound tube 11 during the pressing process. This reduces operational errors caused by manual alignment and improves pressing efficiency. The pressing part 221 vertically presses down on the top of the wound tube 11, causing the steel strips of the wound tube 11 to abut and press against each other, achieving a stable constraint on the overall structure of the wound tube 11. This suppresses deformation of the wound tube 11 during the pressing process and ensures the reliability of the pressing process.

[0048] Further, step S20 includes steps S21 and S22. Steps S21 and S22 are optimizations of step S20. Steps S21 and S22 are executed sequentially.

[0049] In step S21, the clamping part 222 is controlled to clamp the outer circumferential wall of the wound tube 11 on the pressing unit 21 in the horizontal direction. This achieves the initial adjustment of the posture of the wound tube 11, and thus obtains horizontal constraint before the pressing part 221 presses down, thereby ensuring the reliability of the positioning unit 22 in positioning the wound tube 11.

[0050] In step S22, the clamping part 222 completes the clamping of the winding tube 11, and the pressing part 221 is controlled to press the top of the winding tube 11 vertically downward. This achieves an orderly coordination of clamping and pressing, thereby applying a vertical pressing force on the basis of horizontal constraint, so that the steel strips of the winding tube 11 abut against each other, achieving the effect of ensuring the overall stability of the winding tube 11.

[0051] In this embodiment, the clamping part 222 and the pressing part 221 work in sequence to form a two-way composite positioning constraint from horizontal limiting to vertical compaction, which avoids the problems of offset, warping, and interlayer misalignment of the winding tube 11, and greatly improves the positioning reliability and efficiency.

[0052] Furthermore, in step S21, the clamping part 222 clamps the winding tube 11 at a position offset upwards from the middle of the winding tube 11 by a first preset distance. When the winding tube 11 is placed vertically, the top tilt is the greatest. By clamping and constraining the upper part of the winding tube 11, the auxiliary straightening effect on the top of the winding tube 11 can be improved, ensuring the orderly downward transmission of pressure when the pressing part 221 presses down.

[0053] Furthermore, step S20 also includes steps S23 and S24. Steps S21, S22, S23 and S24 are executed sequentially.

[0054] Step S23: Based on the clamping part 221 completing the clamping of the top of the winding tube 11, the clamping part 222 is controlled to release the winding tube 11 pressed down by the clamping part 221, and the release time is accumulated. Since the winding tube 11 above the clamping part 222 has been clamped by the clamping part 221, while the winding tube 11 below the clamping part 222 is relatively loose, by releasing the clamping part 222, the clamping part 221 can continue to press down on the winding tube 11 below, realizing the gradual clamping of different parts of the winding tube 11, thereby ensuring the uniformity of the overall clamping of the winding tube 11.

[0055] In step S24, based on the preset release time, the clamping part 222 is controlled to clamp the outer circumferential wall of the winding tube 11 again in the horizontal direction. By setting a preset time and clamping again after the preset release time is reached, the winding tube 11 above and below the clamping part 222 is pressed, thus achieving stable maintenance of the overall posture of the winding tube 11. This ensures the reliability of the reinforcing ring 12 and the winding tube 11 during pressing, and achieves the effect of ensuring the posture of the winding tube 11.

[0056] In this embodiment, the clamping action of the clamping part 222 is used to gradually press different parts of the winding tube 11, thereby ensuring the uniformity of the overall pressing of the winding tube 11.

[0057] Furthermore, step S20 also includes step S25. Step S25 is executed after step S23.

[0058] Step S25: Based on the top of the wound tube 11 being under pressure and the clamping part 222 being in a loosened state, the clamping part 222 is controlled to move downwards by a second preset distance. Since the pressing part 221 might interfere with the clamping part 222 if the top of the wound tube 11 is under pressure, controlling the clamping part 222 to move downwards by the second preset distance adjusts the position of the clamping part 222, thus preventing collision between the clamping part 222 and the pressing part 221. Simultaneously, the upper wound tube 11 is already compressed, and the downward movement of the clamping part 222 allows it to clamp the looser lower wound tube 11, ensuring the posture of the lower wound tube 11. Furthermore, the downward movement of the clamping part 222 avoids the problem of the middle part easily bulging when both the top and bottom are compressed, further ensuring the posture of the wound tube 11 in the pressing gap.

[0059] Furthermore, the second preset distance is positively correlated with the axial length of the winding tube 11. Since the longer the winding tube 11 is, the greater its shrinkage distance, by setting the second preset distance to be positively correlated with the axial length of the winding tube 11, the downward movement distance of the clamping part 222 can be adapted to winding tube sub-assemblies 10 of different specifications, preventing the clamping part 222 from colliding with the pressing part 221, thereby realizing the universality of the positioning unit 22 for winding tubes 11 of different lengths, and achieving the effect of improving the universality of the positioning unit 22.

[0060] Furthermore, during the expansion of the flaring die 211, it moves downwards. During the closing of the closing die 212, it moves downwards. Since upward movement of the flaring die 211 and closing die 212 during expansion and closing would cause hard friction between the winding tube 11 and the clamping part 222, by moving the flaring die 211 and closing die 212 downwards, the possibility of damage to the winding tube sub-assembly 10 is reduced by utilizing the stretchable feature of the winding tube 11 at the bottom. At the same time, since the reinforcing ring 12 and the winding tube 11 have been positioned, the multiple steel strips of the winding tube 11 located in the pressing gap have been initially pressed and positioned. When the flaring die 211 and closing die 212 move downwards, the friction between them and the winding tube 11 can further press the multiple turns of steel strips of the winding tube 11 in the annular pressing gap, thereby improving the pressing effect between the winding tube 11 and the reinforcing ring 12.

[0061] Furthermore, the pressing method for the spiral tube sub-assembly 10 also includes step S40, in which steps S10, S20, S30 and S40 are executed sequentially.

[0062] In step S40, based on the completion of the pressing of the winding tube sub-assembly 10, the pressing part 221, the pressing unit 21, and the clamping part 222 are sequentially controlled to release the winding tube sub-assembly 10. By sequentially controlling the release of the pressing part 221, the pressing unit 21, and the clamping part 222, the winding tube sub-assembly 10 is released in sequence, thereby reducing the possibility of swinging when removing the winding tube sub-assembly 10 and ensuring the quality of the winding tube sub-assembly 10.

[0063] Example 2:

[0064] In this embodiment, a pressing device 20 for a spiral wound tube assembly 10 is provided, which is applied to the pressing method of the spiral wound tube assembly 10. The pressing device 20 for the spiral wound tube assembly 10 includes a pressing unit 21 and a positioning unit 22.

[0065] like Figure 5 As shown, the pressing unit 21 includes a flaring die 211, a closing die 212, an inner guide portion 213, an outer guide portion 214, and a lifting portion 215. The pressing unit 21 integrates the flaring die 211, the closing die 212, the inner guide portion 213, the outer guide portion 214, and the lifting portion 215. The flaring die 211 includes multiple first pressing blocks arranged in a ring, and the closing die 212 includes multiple second pressing blocks arranged in a ring. The flaring die 211 is located at the center of the closing die 212. Through the ring-shaped distribution and central arrangement of the flaring die 211 and the closing die 212, a uniform, circumferential force is applied to the wound tube 11 and the reinforcing ring 12, thereby ensuring the uniformity of the pressing of the reinforcing ring 12. The inner guide portion 213 has a first conical surface 2131, and the flaring die 211 slides against the first conical surface 2131. The outer guide portion 214 has a second conical surface 2141. The flaring die 211 is guided to slide by the first conical surface 2131 of the inner guide portion 213, and the closing die 212 is guided to slide by the second conical surface 2141 of the outer guide portion 214. This achieves precise guidance for the radial movement of the flaring die 211 and the closing die 212, thus ensuring the accuracy and stability of the pressing action. The closing die 212 slides against the second conical surface 2141. The lifting portion 215 is vertically raised and lowered, and the flaring die 211 and the closing die 212 are respectively radially slidably connected to the lifting portion 215. The inner guide portion 213 and the outer guide portion 214 are fixed in position. By simultaneously driving the flaring die 211 and the closing die 212 to slide radially through a single lifting portion 215, the synchronous driving of the expansion of the flaring die 211 and the closing die 212 by a single power source is achieved, thereby saving driving force and simplifying the structure. An annular pressing gap is formed between the outer periphery of the flaring die 211 and the inner periphery of the closing die 212, which realizes the accommodation and positioning of the wound tube 11 and the reinforcing ring 12, thereby providing an accurate processing area for pressing.

[0066] like Figure 2As shown, the positioning unit 22 includes a pressing part 221 and a clamping part 222. The pressing part 221 is vertically raised and lowered, and the clamping part 222 includes a first clamping jaw 2221 and a second clamping jaw 2222. The first clamping jaw 2221 and the second clamping jaw 2222 are horizontally slidable, and the axis of the pressing unit 21 is located between the first clamping jaw 2221 and the second clamping jaw 2222. By pressing the top of the winding tube 11 vertically raised and lowered by the pressing part 221 of the positioning unit 22, and by clamping the outer peripheral wall of the winding tube 11 horizontally slidable by the first clamping jaw 2221 and the second clamping jaw 2222, the automatic straightening and posture maintenance of the winding tube 11 is achieved, thereby avoiding manual straightening and improving the pressing efficiency and reliability. The axis of the pressing unit 21 is located between the first clamping jaw 2221 and the second clamping jaw 2222, so that the clamping force acts symmetrically on the winding tube 11, thereby ensuring the clamping stability.

[0067] Furthermore, the diameter of the first conical surface 2131 gradually increases downwards, while the diameter of the second conical surface 2141 gradually decreases downwards. The inner guide portion 213, the flaring die 211, the closing die 212, and the outer guide portion 214 are arranged sequentially from the inside to the outside of the pressing unit 21. By arranging the diameter of the first conical surface 2131 to gradually increase downwards and the diameter of the second conical surface 2141 to gradually decrease downwards, when the lifting portion 215 moves downwards, the flaring die 211 slides outwards along the first conical surface 2131 and expands, while the closing die 212 slides inwards along the second conical surface 2141 and closes. This allows the flaring die 211 and the closing die 212 to move downwards as a whole during operation, thereby preventing friction between the wound tube 11 and the clamping portion 222 and ensuring that the wound tube 11 is not damaged.

[0068] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A press-fitting method for a spiral wound tube sub-assembly, characterized in that, The spiral wound tube assembly includes a spiral wound tube body and a reinforcing ring; the press-fitting method for the spiral wound tube assembly includes: The wound tube and reinforcing ring are vertically placed in the annular pressing gap of the pressing unit, with the reinforcing ring located on the outer periphery of the bottom of the wound tube. The wound tube is formed by spirally winding a steel strip with an S-shaped cross-section. Adjacent turns of the steel strip on the wound tube are interlocked. The pressing unit includes a flaring die and a closing die. The flaring die includes multiple first pressing blocks arranged in a ring. The closing die includes multiple second pressing blocks arranged in a ring. The flaring die is located at the center of the closing die. The annular pressing gap is formed between the outer periphery of the flaring die and the inner periphery of the closing die. The control positioning unit positions the wound tube; wherein, the positioning unit includes a pressing part and a clamping part; when the wound tube is positioned, the pressing part presses against the top of the wound tube, and the clamping part clamps against the outer peripheral wall of the wound tube; Based on the positioning of the wound tube, the flaring die is controlled to expand and the closing die is controlled to close, so as to press and fix the reinforcing ring to the bottom outer periphery of the wound tube body, forming a wound tube sub-assembly.

2. The pressing method for a spiral wound tube sub-assembly according to claim 1, characterized in that, The control and positioning unit positions the wound tube, including: The clamping part is controlled to clamp the outer circumferential wall of the wound tube on the pressing unit in the horizontal direction; The clamping part clamps the wound tube, and the pressing part presses the top of the wound tube vertically downward.

3. The pressing method for a spiral wound tube sub-assembly according to claim 2, characterized in that, In the step of the control clamping part clamping the outer circumferential wall of the winding tube on the pressing unit in the horizontal direction, the part of the clamping part clamping the winding tube is a position that is offset upward from the middle of the winding tube by a first preset distance.

4. The pressing method for a spiral wound tube sub-assembly according to claim 2, characterized in that, The control and positioning unit positions the wound tube body, and further includes: Based on the clamping part clamping the top of the wound tube, the clamping part is controlled to release the wound tube pressed down by the clamping part, and the cumulative release time is calculated. Based on the release time reaching the preset time, the clamping part is controlled to clamp the outer circumferential wall of the wound tube again in the horizontal direction.

5. The pressing method for a spiral wound tube sub-assembly according to claim 4, characterized in that, The control and positioning unit positions the wound tube body, and further includes: Based on the fact that the top end of the wound tube is under pressure and the clamping part is in a released state from the wound tube, the clamping part is controlled to move down a second preset distance.

6. The pressing method for a spiral wound tube sub-assembly according to claim 5, characterized in that, The second preset distance is positively correlated with the axial length of the wound tube.

7. The pressing method for a spiral wound tube sub-assembly according to claim 1, characterized in that, During the expansion process of the flaring die, the flaring die moves downward; During the closing process, the closing mold moves downwards.

8. The pressing method for a spiral wound tube sub-assembly according to claim 1, characterized in that, The press-fitting method for the spiral wound tube assembly also includes: Based on the completion of the pressing of the spiral tube sub-assembly, the pressing part, the pressing unit and the clamping part are sequentially controlled to release the spiral tube sub-assembly.

9. A pressing device for a spiral wound tube assembly, applied to the pressing method for the spiral wound tube assembly according to any one of claims 1-8, characterized in that, The press-fitting device for the spiral wound tube assembly includes: A pressing unit includes a flaring die, a closing die, an inner guide portion, an outer guide portion, and a lifting portion; the flaring die includes a plurality of first pressing blocks arranged in a ring; the closing die includes a plurality of second pressing blocks arranged in a ring; the flaring die is located at the center of the closing die; the inner guide portion has a first conical surface; the flaring die slides against the first conical surface; the outer guide portion has a second conical surface; the closing die slides against the second conical surface; the lifting portion is vertically raised and lowered; the flaring die and the closing die are respectively radially slidably connected to the lifting portion; the inner guide portion and the outer guide portion are fixed in position; an annular pressing gap is formed between the outer peripheral side of the flaring die and the inner peripheral side of the closing die; The positioning unit includes a pressing part and a clamping part; the pressing part is vertically movable; the clamping part includes a first clamping jaw and a second clamping jaw; the first clamping jaw and the second clamping jaw are horizontally slidable; the axis of the pressing unit is located between the first clamping jaw and the second clamping jaw.

10. The pressing device for a spiral wound tube sub-assembly according to claim 9, characterized in that, The diameter of the first conical surface gradually increases downwards; the diameter of the second conical surface gradually decreases downwards; the inner guide portion, the flaring die, the closing die, and the outer guide portion are arranged sequentially from the inside to the outside of the pressing unit.

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