Pipe fitting rounding device

Abstract

The utility model relates to a pipe fitting rounding device which comprises an outer diameter bushing, a roller pin assembly and a rotating shaft, the rotating shaft penetrates through the outer diameter bushing and is fixedly connected with the roller pin assembly, a pipe opening of an exhaust tail pipe is inserted between the outer diameter bushing and a roller pin mounting plate, and when the rotating shaft is rotated through a hand wheel, the rotating shaft drives the roller pin mounting plate to rotate relative to the outer diameter bushing. The rolling needle rolls the inner wall of the exhaust tail pipe orifice, and the inner wall and the outer wall of the exhaust tail pipe orifice are simultaneously rolled under the combined action of the outer diameter bushing and the rolling needle, so that the aims of eliminating stress and correcting the caliber of the exhaust tail pipe orifice are fulfilled, the aim of rounding the exhaust tail pipe orifice is fulfilled, the rounding precision is higher, and the product percent of pass can reach more than 99.9%.

Description

Technical Field

[0001] This utility model relates to the technical field of pipe fitting rounding, and in particular to a pipe fitting rounding device. Background Technology

[0002] Circular alignment is a process used to adjust the cross-section of pipes or slender objects to a near-perfect circle. In the manufacturing industry, especially in metal processing and machinery manufacturing, circular alignment is a crucial step in ensuring the precision and sealing of component connections. The purposes of circular alignment are: to ensure uniform inner and outer diameters of pipes or parts, preventing installation difficulties or sealing failures caused by irregular shapes; to reduce stress concentration within the material, improving the strength and durability of parts; and in fluid pipelines, circular alignment helps improve fluid flow efficiency and reduce frictional losses.

[0003] Common rounding processes include: eight-lobed flaring, which is typically used for large-diameter pipes. The pipe end (51) is expanded into an eight-lobed shape using mechanical equipment, and then rounded uniformly under pressure. While flaring can make pipe connections smoother, it may cause precision issues after welding. Sizing machine rounding, where a sizing machine uses clamping tools and a pressurizing device to press the inner and outer diameters of the pipe to the required specifications. This method is usually highly automated and suitable for medium to long pipes, but may not be suitable for short pipes and specially shaped components. Die stamping rounding, where pressure is applied directly to the pipe using a die to shape it into a circle. This is suitable for mass production, but the pass rate may be low for deformations caused by post-weld stress.

[0004] However, most exhaust tailpipe products use welding processes. Due to the influence of welding stress and thermal deformation, the installation diameter of the tailpipe is prone to deformation. The eight-lobed flaring process cannot meet the accuracy requirement of + / -0.3. Due to the influence of equipment space, the installation diameter that is too short or hidden in the housing cannot be rounded by the sizing machine. The pass rate of rounding by die stamping cannot be guaranteed.

[0005] Therefore, it is necessary to design a pipe fitting rounding device to solve the problem of low accuracy in rounding pipe fitting diameters. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a pipe fitting rounding device, which is equipped with an outer diameter insert. By utilizing the combined force of the outer diameter insert and the needle roller, the inner and outer walls of the exhaust tailpipe are rolled simultaneously to eliminate stress and achieve the purpose of correcting the pipe opening diameter, with higher precision.

[0007] To achieve the above and other related objectives, a pipe fitting rounding device includes:

[0008] Outer diameter sleeve;

[0009] Needle roller assembly, the needle roller assembly is embedded and installed in the outer diameter bushing;

[0010] A rotating shaft movably passes through the outer diameter bushing and is fixedly connected to the needle roller assembly;

[0011] The rotating shaft is mounted on the bearing seat, and the exhaust tailpipe is sleeved on the outer diameter bushing, so that the outlet of the exhaust tailpipe is inserted between the outer diameter bushing and the needle roller assembly.

[0012] In one embodiment of the present invention, a countersunk platform is provided in the middle of the through hole of the outer diameter sleeve, so that the two ends of the outer diameter sleeve respectively form a first receiving cavity and a second receiving cavity. The needle roller assembly is installed in the first receiving cavity, and the second bearing is fitted in the second receiving cavity. The rotating shaft passes through the outer diameter sleeve coaxially through the second bearing.

[0013] In one embodiment of the present invention, an avoidance groove is uniformly formed on the outer side wall of the outer diameter sleeve near the end of the first receiving cavity.

[0014] In one embodiment of the present invention, the needle roller assembly includes a short cylindrical needle roller mounting plate and at least one needle roller. The needle roller mounting plate is coaxially disposed in a first receiving cavity, and a molding cavity is formed between the outer cylindrical surface of the needle roller mounting plate and the inner wall of the first receiving cavity. The needle rollers are evenly arranged along the circumference of the needle roller mounting plate, such that the outer side wall of each needle roller protrudes and is located in the molding cavity, for rolling the nozzle of the exhaust tailpipe.

[0015] In one embodiment of the present invention, at least one mounting groove that mates with the roller needle is uniformly provided on the outer circumference of the roller needle mounting plate, and the roller needle is disposed in the mounting groove in a corresponding manner, so that each roller needle and the outer diameter bushing are arranged axially parallel.

[0016] In one embodiment of this utility model, a shaft hole with a keyway is provided in the middle of the needle roller mounting plate, and the rotating shaft is fixedly connected to the needle roller mounting plate by the cooperation of the fixing key and the keyway.

[0017] In one embodiment of the present invention, the needle roller assembly further includes a needle roller baffle, which is disposed on the side of the needle roller mounting plate away from the first receiving cavity, and is fixedly connected to the needle roller mounting plate and the corresponding shaft end of the rotating shaft.

[0018] In one embodiment of the present invention, a bearing cavity is provided on the bearing seat, a first bearing is installed in the bearing cavity, the rotating shaft passes through the bearing seat through the first bearing, a sealing baffle is installed on the bearing cavity, and a retaining sleeve is provided on the side of the rotating shaft away from the outer diameter sleeve of the sealing baffle, the retaining sleeve axially limiting the rotating shaft.

[0019] In one embodiment of the present invention, the outer diameter bushing is rotatably mounted on the first end of the rotating shaft via a second bearing, and a handwheel is fixedly connected to the second end of the rotating shaft corresponding to the first end.

[0020] In one embodiment of this utility model, the bearing seat is vertically mounted and fixedly installed on the base.

[0021] The beneficial technical effects of this utility model include at least the following:

[0022] This utility model discloses a pipe fitting rounding device, which includes an outer diameter bushing, a needle roller assembly, and a rotating shaft. The rotating shaft passes through the outer diameter bushing and the needle roller assembly and is fixedly connected. The pipe opening of the exhaust tailpipe is inserted between the outer diameter bushing and the needle roller mounting plate. When the rotating shaft is rotated by handwheel, the rotating shaft drives the needle roller mounting plate to rotate relative to the outer diameter bushing. The needle rollers roll the inner wall of the exhaust tailpipe opening. Under the combined action of the outer diameter bushing and the needle rollers, the inner and outer walls of the pipe opening are simultaneously rolled, achieving the purpose of stress relief and correcting the pipe opening diameter, thus achieving the purpose of rounding the pipe opening. Its rounding accuracy is higher, and the product qualification rate can reach over 99.9%. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of a pipe fitting rounding device provided in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A magnified view of part A;

[0025] Figure 3 This is a schematic diagram of the outer diameter insert provided in an embodiment of the present utility model;

[0026] Figure 4 for Figure 3 Another axonometric view;

[0027] Figure 5 An exploded view of a needle roller assembly provided in an embodiment of this utility model;

[0028] Figure 6 This is a schematic diagram of the installation of the needle roller and the needle roller mounting plate according to an embodiment of the present invention;

[0029] Figure 7 A schematic diagram of the shaft mounting components provided in an embodiment of this utility model;

[0030] Figure 8 This is a schematic diagram of the usage state of a pipe fitting rounding device according to an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the structure of an automobile tailpipe provided in an embodiment of the present invention;

[0032] Figure 10 for Figure 8 The front view;

[0033] Figure 11 for Figure 10AA sectional view.

[0034] Component symbol explanation:

[0035] Outer diameter bushing 1, needle roller assembly 2, rotating shaft 3, second bearing 31, first bearing 32, retaining sleeve 33, handwheel 34, shaft seat 4, first receiving cavity 11, second receiving cavity 12, shaping cavity 13, clearance groove 14, needle roller mounting plate 21, mounting groove 211, needle roller 22, needle roller baffle 23, exhaust tailpipe 5, pipe opening 51, connecting rib plate 52, sealing baffle 41, base 42. Detailed Implementation

[0036] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0037] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0039] Please see Figure 1 , Figure 2 and Figure 8 The present invention provides a pipe fitting rounding device, comprising an outer diameter sleeve 1, a needle roller assembly 2 and a rotating shaft 3. The needle roller assembly 2 is embedded in the outer diameter sleeve 1; the rotating shaft 3 movably passes through the outer diameter sleeve 1 and is fixedly connected to the needle roller assembly 2; wherein, the rotating shaft 3 is rotatably mounted on a shaft seat 4, and an exhaust tail pipe 5 is sleeved on the outer diameter sleeve 1, such that the pipe opening 51 of the exhaust tail pipe 5 is inserted between the outer diameter sleeve 1 and the needle roller assembly 2.

[0040] The above-mentioned pipe rounding device is equipped with an outer diameter sleeve 1 and a needle roller assembly 2. The rotating shaft 3 passes through the outer diameter sleeve 1 and the needle roller assembly 2 and is fixedly connected. The pipe opening 51 of the exhaust tail pipe 5 is inserted between the outer diameter sleeve 1 and the needle roller assembly 2. When the rotating shaft 3 rotates, it drives the needle roller assembly 2 to rotate relative to the outer diameter sleeve 1. The needles of the outer diameter sleeve 1 and the needle roller assembly 2 work together to roll the inner and outer walls of the pipe opening 51 of the exhaust tail pipe 5 at the same time, so as to eliminate stress and correct the diameter of the pipe opening 51, resulting in higher rounding accuracy.

[0041] It should be noted that in machining and metal forming processes, stress relief typically refers to reducing or eliminating residual stress within the material. Residual stress refers to invisible stress within the material caused by processing, cooling, or other factors. These stresses can lead to workpiece deformation, cracking, or other quality problems.

[0042] The roller-type rolling device of this utility model can perform rolling processing on the inner or outer wall of pipes or other workpieces through the combined force of the roller and the outer diameter bushing 1. This process can eliminate stress in the following ways: (1) Plastic deformation: During the rolling process, the material will undergo plastic deformation. By applying pressure, the microstructure of the material will be rearranged, thereby eliminating or reducing the internal residual stress. (2) Stress relaxation: In the reversible deformation process, the internal stress of the material may gradually decrease. The movement of the roller and the applied pressure promote the release of internal stress. (3) Grain refinement: The rolling process may cause the material grains to be refined, which can improve the strength and toughness of the material and reduce internal stress to a certain extent. (4) Balanced force distribution: By designing a reasonable outer diameter bushing 1 and roller shape, the material can be loaded and deformed more evenly, and the stress distribution can be balanced as much as possible, which helps to eliminate local stress concentration.

[0043] Please see Figure 3 and Figure 4 In one embodiment of the present invention, a countersunk platform is provided in the middle of the through hole of the outer diameter sleeve 1, so that the two ends of the outer diameter sleeve 1 form a first receiving cavity 11 and a second receiving cavity 12 respectively. The needle roller assembly 2 is installed in the first receiving cavity 11, and the second bearing 31 is fitted in the second receiving cavity 12. The rotating shaft 3 passes through the outer diameter sleeve 1 coaxially through the second bearing 31.

[0044] In one embodiment of this utility model, four clearance grooves 14 are evenly formed on the outer wall of the outer diameter sleeve 1 near the first receiving cavity 11, and one of the clearance grooves 14 extends parallel to the tangent of the outer cylindrical surface of the outer diameter sleeve 1 to form a clearance plane. This makes this utility model applicable to automobile tailpipes of different shapes. Figure 9 As shown, the clearance groove 14 can also avoid the connecting rib plate 52 provided inside the tailpipe for connecting the pipe opening 51.

[0045] Please see Figure 5 and Figure 6 In one embodiment of this utility model, the needle roller assembly 2 includes a short cylindrical needle roller mounting plate 21 and at least four needle rollers 22. The needle roller mounting plate 21 is coaxially disposed within a first receiving cavity 11, and a molding cavity 13 is formed between the outer cylindrical surface of the needle roller mounting plate 21 and the inner wall of the first receiving cavity 11. The needle rollers 22 are evenly arranged along the circumference of the needle roller mounting plate 21, such that the outer side wall of each needle roller 22 protrudes and is located in the molding cavity 13, for rolling the nozzle 51 of the exhaust tailpipe 5. At least four mounting grooves 211 that mate with the needle rollers 22 are evenly provided on the outer circumference of the needle roller mounting plate 21. The needle rollers 22 are correspondingly disposed in the mounting grooves 211, such that each needle roller 22 and the outer diameter bushing 1 are arranged axially parallel. A shaft hole with a keyway is provided in the middle of the needle roller mounting plate 21, and the rotating shaft 3 is fixedly connected to the needle roller mounting plate 21 by the cooperation of the fixing key and the keyway.

[0046] It should be noted that when the rotating shaft 3 drives the needle roller mounting plate 21 to rotate around it, the needle roller 22 rotates around the rotating shaft 3 and rotates within its corresponding mounting groove 211, thereby rolling the side wall of the pipe opening 51 located in the shaping cavity 13 and performing a rounding operation on the pipe opening 51.

[0047] In one embodiment of the present invention, the needle roller assembly further includes a needle roller baffle 23, which is disposed on the side of the needle roller mounting plate 21 away from the first receiving cavity 11, and is fixedly connected to the needle roller mounting plate 21 and the corresponding shaft end of the rotating shaft 3, respectively.

[0048] It should be noted that the needle roller baffle 23 is positioned on one side of the needle roller mounting plate 21 and is fixedly connected to the corresponding shaft end of the rotating shaft 3, which can prevent the needle roller 22 from sliding out of the mounting groove 211.

[0049] Please see Figure 7 and Figure 11 In one embodiment of this utility model, a bearing cavity is provided on the bearing seat 4, and a first bearing 32 is fitted inside the bearing cavity. The rotating shaft 3 passes through the bearing seat 4 through the first bearing 32. A sealing baffle 41 is fitted on the bearing cavity. A retaining sleeve 33 is provided on the side of the rotating shaft 3 away from the outer diameter sleeve 1 of the sealing baffle 41. The retaining sleeve 33 and the rotating shaft 3 are integrally formed or fixedly connected. The retaining sleeve 33 is used to axially limit the rotating shaft 3. The outer diameter sleeve 1 is rotatably mounted on the first end of the rotating shaft 3 through the second bearing 31. A handwheel 34 is fixedly connected to the second end of the rotating shaft 3 corresponding to its first end. The bearing seat 4 is vertically and fixedly mounted on the base 42.

[0050] It should be noted that the rotating shaft 3 is rotatably mounted on the bearing seat 4 via the first bearing 32, and the bearing seat is fixedly mounted on the base 42 for easy use.

[0051] Please see Figures 8-11 In summary, the pipe fitting rounding device of this utility model achieves at least the following beneficial technical effects:

[0052] The rotating shaft 3 passes through the outer diameter sleeve 1 and the needle roller assembly 2 and is fixedly connected. The pipe opening 51 of the exhaust tail pipe 5 is inserted between the outer diameter sleeve 1 and the needle roller mounting plate 21. When the rotating shaft 3 is rotated by the handwheel 34, the rotating shaft 3 drives the needle roller mounting plate 21 to rotate relative to the outer diameter sleeve 1. The needle roller 23 rolls the inner wall of the pipe opening 51 of the exhaust tail pipe 5. Under the combined action of the outer diameter sleeve 1 and the needle roller 22, the inner and outer walls of the pipe opening 51 are rolled at the same time, so as to eliminate stress and correct the diameter of the pipe opening 51. This achieves the operation of making the pipe opening 51 round, resulting in higher rounding accuracy and a product qualification rate of over 99.9%.

[0053] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of methods and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0054] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A device for rounding pipe fittings, characterized in that, include: Outer diameter insert (1); Needle roller assembly (2), which is embedded in the outer diameter bushing (1); A rotating shaft (3) movably passes through the outer diameter bushing (1) and is fixedly connected to the needle roller assembly (2); The rotating shaft (3) is rotatably mounted on the bearing seat (4), and the exhaust tail pipe (5) is sleeved on the outer diameter bushing (1), so that the pipe opening (51) of the exhaust tail pipe (5) is inserted between the outer diameter bushing (1) and the needle roller assembly (2).

2. The pipe fitting rounding device according to claim 1, characterized in that, The outer diameter bushing (1) has a countersunk plate in the middle of the through hole, so that the two ends of the outer diameter bushing (1) form a first receiving cavity (11) and a second receiving cavity (12) respectively. The needle roller assembly (2) is installed in the first receiving cavity (11), and the second bearing (31) is fitted in the second receiving cavity (12). The rotating shaft (3) passes through the outer diameter bushing (1) coaxially through the second bearing (31).

3. The pipe fitting rounding device according to claim 2, characterized in that, The outer wall of the outer diameter sleeve (1) near the end of the first receiving cavity (11) is uniformly provided with clearance grooves (14).

4. The pipe fitting rounding device according to claim 3, characterized in that, The needle roller assembly (2) includes a short cylindrical needle roller mounting plate (21) and at least four needle rollers (22). The needle roller mounting plate (21) is coaxially disposed in the first receiving cavity (11), and a molding cavity (13) is formed between the outer cylindrical surface of the needle roller mounting plate (21) and the inner wall of the first receiving cavity (11). The needle rollers (22) are evenly arranged along the circumference of the needle roller mounting plate (21). The outer side wall of the needle rollers (22) protrudes and is located in the molding cavity (13) for rolling the opening (51) of the exhaust tailpipe (5).

5. The pipe fitting rounding device according to claim 4, characterized in that, At least four mounting grooves (211) that mate with the needle rollers (22) are evenly provided on the outer circumference of the needle roller mounting plate (21). The needle rollers (22) are arranged one-to-one in the mounting grooves (211), and each needle roller (22) and the outer diameter bushing (1) are arranged axially parallel.

6. The pipe fitting rounding device according to claim 5, characterized in that, The needle roller mounting plate (21) has a keyway in the middle, and the rotating shaft (3) is fixedly connected to the needle roller mounting plate (21) by the cooperation of the fixing key and the keyway.

7. The pipe fitting rounding device according to claim 6, characterized in that, The needle roller assembly also includes a needle roller baffle (23), which is disposed on the side of the needle roller mounting plate (21) away from the first receiving cavity (11) and is fixedly connected to the needle roller mounting plate (21) and the corresponding shaft end of the rotating shaft (3).

8. The pipe fitting rounding device according to claim 1 or 7, characterized in that, The bearing seat (4) has a bearing cavity, and a first bearing (32) is fitted inside the bearing cavity. The rotating shaft (3) passes through the bearing seat (4) through the first bearing (32). A sealing baffle (41) is fitted on the bearing cavity. A retaining sleeve (33) is provided on the side of the rotating shaft away from the outer diameter bushing (1) of the sealing baffle. The retaining sleeve (33) limits the axial movement of the rotating shaft (3).

9. The pipe fitting rounding device according to claim 8, characterized in that, The outer diameter bushing (1) is rotatably mounted on the first end of the rotating shaft (3) via the second bearing (31), and a handwheel (34) is fixedly connected to the second end of the rotating shaft (3) corresponding to its first end.

10. The pipe fitting rounding device according to claim 9, characterized in that, It also includes a base (42), on which the bearing (4) is vertically and fixedly mounted.

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