A clamping tool for machining a large thin-walled cylinder and a method of using the same

Abstract

The present application relates to the technical field of large thin-walled cylinder processing, and discloses a clamping tool for large thin-walled cylinder processing and a use method thereof, the clamping tool comprises support frames arranged at the axial two ends of the large thin-walled cylinder respectively; the two ends of the support frame are in abutment with the inner walls of the large thin-walled cylinder respectively, and the length of the support frame is adjustable. The present application can adapt to the clamping requirements of cylinders with different diameters and has high universality.

Description

Technical Field

[0001] This invention relates to the field of large thin-walled cylinder processing technology, specifically to a clamping fixture for processing large thin-walled cylinders and its usage method. Background Technology

[0002] When machining large-diameter pipe joints and densely packed small-diameter drainage holes (approximately 30mm in diameter) in large thin-walled cylinders (diameter greater than 2000mm and wall thickness ≤25mm), local deformation is prone to occur due to insufficient rigidity of the cylinder structure, resulting in decreased machining accuracy and hole position displacement.

[0003] To address the aforementioned technical issues of decreased machining accuracy and hole misalignment, support fixtures are typically used to support the cylinder. However, traditional support fixtures are mostly fixed structures, which cannot adapt to the clamping requirements of cylinders with different hole diameters and have low versatility. Summary of the Invention

[0004] The technical objective of this invention is to address the shortcomings of the prior art by providing a clamping fixture for machining large thin-walled cylinders that is adaptable to the clamping requirements of cylinders with different apertures and has high versatility, as well as a method for using it.

[0005] The first technical solution adopted in this invention is as follows: A clamping fixture for processing large thin-walled cylinders, the clamping fixture including support frames respectively disposed at both axial ends of the large thin-walled cylinder; The two ends of the support frame abut against the inner wall of the large thin-walled cylinder, and the length of the support frame is adjustable.

[0006] The above-mentioned technical measures, by setting support frames at both ends of the large thin-walled cylinder with adjustable length, can flexibly adjust the length according to the cylinder with different aperture, adapt to the clamping requirements of cylinders with different apertures, and have strong versatility.

[0007] Furthermore, the support frame includes a first support arc plate, a first threaded rod, a sleeve, a second threaded rod, and a second support arc plate that are connected in sequence by threads; The first threaded rod has a first thread at each end, and the second threaded rod has a second thread at each end, with the first thread and the second thread having opposite directions of rotation. One end of the sleeve in the axial direction is provided with a threaded hole that matches the first thread, and the other end of the sleeve in the axial direction is provided with a threaded hole that matches the second thread. The first support arc plate is provided with a threaded hole that matches the first thread, and the second support arc plate is provided with a threaded hole that matches the second thread. The thread engagement length between the first threaded rod and the sleeve is adjustable, and the thread engagement length between the second threaded rod and the sleeve is also adjustable. The first and second supporting arc plates abut against the inner wall of the large thin-walled cylinder, respectively.

[0008] The above-mentioned technical measures include the first support arc plate, the first threaded rod, the sleeve, the second threaded rod, and the second support arc plate, all of which are connected by threads, making operation simple and easy to disassemble and assemble; by setting the first thread and the second thread to have opposite rotation directions, the first threaded rod and the second threaded rod can be synchronously extended and retracted by turning the sleeve, effectively improving the adjustment efficiency.

[0009] Furthermore, both the first and second supporting arc plates include a connecting cylinder and an arc plate connected to each other; The connecting cylinder of the first supporting arc plate is provided with a threaded hole that matches the first thread, and the connecting cylinder of the second supporting arc plate is provided with a threaded hole that matches the second thread. The arc plate abuts against the inner wall of the large thin-walled cylinder, and the curvature of the arc plate matches the curvature of the inner wall of the large thin-walled cylinder.

[0010] In the above-mentioned technical measures, the curvature of the arc plate is matched with the curvature of the inner wall of the large thin-walled cylinder, which can increase the contact area, disperse local pressure, and effectively avoid stress concentration that could lead to damage to the inner wall.

[0011] Furthermore, the mid-section of both the first and second threaded rods is hexagonal.

[0012] The above-mentioned technical measures, by setting the middle cross-section of the first threaded rod and the middle cross-section of the second threaded rod to hexagonal, facilitate the operation of tools such as wrenches, reduce the difficulty of operation, and improve convenience.

[0013] Furthermore, the clamping fixture also includes a reinforcing frame, which is disposed at the large-diameter pipe connection hole inside the large thin-walled cylinder. The reinforcing frame includes a grid-shaped structure formed by welding together at least two transverse tie rods and two longitudinal tie rods; connecting rods are fixed at both ends of the transverse tie rods and the two ends of the longitudinal tie rods, and the connecting rods are welded to the inner wall of the large thin-walled cylinder, with the welding point located at the opening of the large-diameter pipe connection hole.

[0014] The above-mentioned technical measures strengthen the structure of the large-diameter pipe joint by setting a reinforcing skeleton and making localized targeted reinforcement. The grid-shaped structure is welded to the opening of the large-diameter pipe joint by connecting rods, which can effectively enhance the structural rigidity of the large-diameter pipe joint and effectively avoid deformation during processing.

[0015] Furthermore, bolts are provided at the weld joints of the transverse and longitudinal tie rods.

[0016] The above-mentioned technical measures, by setting bolts at the weld joints of the transverse and longitudinal tie rods, can further strengthen the weld joints and improve the structural strength and connection stability.

[0017] The large thin-walled cylinder is provided with a support frame at each of its axial ends.

[0018] The above-mentioned technical measures are simple to operate and easy to disassemble and assemble by setting a support frame at each of the two ends of the axial direction.

[0019] The large thin-walled cylinder is provided with multiple support frames at both ends of its axial direction, and the multiple support frames are arranged in an upper and lower position.

[0020] The above-mentioned technical measures, by setting up multiple upper and lower support frames, result in a more uniform distribution of support force and high precision in controlling the roundness of the cylinder.

[0021] The second technical solution adopted in this invention is as follows: A method for using a clamping fixture for machining large thin-walled cylinders as described in the above technical solution 1, the method comprising the following steps: S1. Place the large thin-walled cylinder horizontally, adjust the length of the support frame to be less than the inner diameter of the large thin-walled cylinder, install the support frame at both ends of the large thin-walled cylinder in the axial direction, adjust the length of the support frame at both ends of the large thin-walled cylinder in the axial direction so that the two ends of the support frame abut against the inner wall of the large thin-walled cylinder, and make the roundness error of the large thin-walled cylinder ≤1mm. S2. Move the large thin-walled cylinder to the worktable, set up a pressure plate device on the outer periphery of the large thin-walled cylinder, complete the clamping, and carry out processing.

[0022] The above-mentioned technical measures enable the rapid assembly and disassembly of the support frame by flexibly adjusting its length. At the same time, the roundness of the large thin-walled cylinder can be adjusted using the support frame. By using the pressure plate device to cooperate with the support frame internally and externally, internal and external support is formed, which effectively limits the deformation of the large thin-walled cylinder, ensures the stability during the processing, and improves the processing accuracy.

[0023] Furthermore, the method of use also includes: S3. After processing, adjust the length of the support frame to be smaller than the inner diameter of the large thin-walled cylinder, remove the support frame, and check the deformation of the large thin-walled cylinder.

[0024] The above-mentioned technical measures assess the effect of the clamping fixture on suppressing deformation during the machining of large thin-walled cylinders by detecting the amount of deformation.

[0025] One or more technical solutions provided by this invention have at least the following technical effects or advantages: This invention provides support frames at both ends of a large thin-walled cylinder along its axial direction. The length of these support frames is adjustable, allowing for flexible length adjustment based on cylinder diameters. This adapts to the clamping requirements of cylinders with different diameters and offers strong versatility.

[0026] This invention combines overall rigid support with targeted local reinforcement by adopting a combined structure of "support frame + reinforcing skeleton". This not only improves the overall structural rigidity of large thin-walled cylinders, but also provides local reinforcement and fixation for large-diameter pipe joints.

[0027] This invention enables rapid assembly and disassembly of the support frame by flexibly adjusting its length. Simultaneously, the support frame allows for adjustment of the roundness of large thin-walled cylinders. By utilizing a pressure plate device in conjunction with the support frame to form internal and external supports, the deformation of large thin-walled cylinders is effectively limited, ensuring stability during processing and improving processing accuracy. Attached Figure Description

[0028] The accompanying drawings, which are provided to further illustrate embodiments of the invention and constitute a part of this invention, are not intended to limit the scope of the invention. Figure 1 This is a schematic diagram showing the usage state of the clamping fixture in this invention; Figure 2 This is a schematic diagram of the support frame in this invention; Figure 3 This is a schematic diagram of the sleeve structure in this invention; Figure 4 yes Figure 3 Schematic diagram of the structure at point AA; Figure 5 This is a structural schematic diagram of the first threaded rod; Figure 6 yes Figure 5 Schematic diagram of the structure at point BB; Figure 7 This is a schematic diagram of the second threaded rod; Figure 8 yes Figure 7 Schematic diagram of the structure at point C; Figure 9 This is a schematic diagram of the structure of the first supporting arc plate; Figure 10 yes Figure 9 Schematic diagram of the D-direction structure; Figure 11 This is a schematic diagram of the structure of the second supporting arc plate; Figure 12 yes Figure 10 Schematic diagram of the E-direction structure; Figure 13 This is a structural diagram of a reinforced skeleton; Among them, 1-large thin-walled cylinder; 2-support frame; 3-first support arc plate; 4-first threaded rod; 5-sleeve; 6-second threaded rod; 7-second support arc plate; 8-connecting cylinder; 9-arc plate; 10-reinforcing skeleton; 11-transverse tie rod; 12-longitudinal tie rod; 13-connecting rod; 14-pressure plate device. Detailed Implementation

[0029] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0031] Example 1 Reference Figures 1-13 This embodiment provides a clamping fixture for processing large thin-walled cylinders. The clamping fixture includes support frames 2 respectively disposed at both ends of the axial direction of the large thin-walled cylinder 1. The two ends of the support frame 2 abut against the inner wall of the large thin-walled cylinder 1, and the length of the support frame 2 is adjustable.

[0032] The support frame 2 includes a first support arc plate 3, a first threaded rod 4, a sleeve 5, a second threaded rod 6, and a second support arc plate 7 connected in sequence by threads. The first threaded rod 4 has a first thread at both ends, and the second threaded rod 6 has a second thread at both ends, with the first thread and the second thread having opposite directions of rotation. One end of the sleeve 5 is provided with a threaded hole that matches the first thread, and the other end of the sleeve 5 is provided with a threaded hole that matches the second thread. The first support arc plate 3 is provided with a threaded hole that matches the first thread, and the second support arc plate 7 is provided with a threaded hole that matches the second thread. The thread engagement length between the first threaded rod 4 and the sleeve 5 is adjustable, and the thread engagement length between the second threaded rod 6 and the sleeve 5 is also adjustable. The first supporting arc plate 3 and the second supporting arc plate 7 respectively abut against the inner wall of the large thin-walled cylinder 1.

[0033] Both the first supporting arc plate 3 and the second supporting arc plate 7 include a connecting cylinder 8 and an arc plate 9 connected together; The connecting cylinder 8 of the first supporting arc plate 3 is provided with a threaded hole that matches the first thread, and the connecting cylinder 8 of the second supporting arc plate 7 is provided with a threaded hole that matches the second thread. The arc plate 9 abuts against the inner wall of the large thin-walled cylinder 1, and the curvature of the arc plate 9 matches the curvature of the inner wall of the large thin-walled cylinder 1.

[0034] Specifically, since errors are unavoidable, the curvature of the arc plate 9 should be as consistent as possible with the curvature of the inner wall of the large thin-walled cylinder 1.

[0035] The mid-section of the first threaded rod 4 and the mid-section of the second threaded rod 6 are both hexagonal.

[0036] The central cross-section of the sleeve 5 is hexagonal, which facilitates the operation of tools such as wrenches.

[0037] The clamping fixture also includes a reinforcing frame 10, which is installed at the large-diameter pipe connection hole inside the large thin-walled cylinder 1. The reinforcing frame 10 includes a grid-shaped structure formed by welding together at least two transverse tie rods 11 and two longitudinal tie rods 12; connecting rods 13 are fixed to both ends of the transverse tie rods 11 and both ends of the longitudinal tie rods 12 respectively, and the connecting rods 13 are welded to the inner wall of the large thin-walled cylinder 1, and the welding point is located at the opening of the large-diameter pipe connection hole.

[0038] Among them, the diameter of the large-diameter pipe connection hole is ≥500mm.

[0039] Each connecting rod 13 is fixed to both ends of the transverse tie rod 11 and both ends of the longitudinal tie rod 12 by welding.

[0040] Bolts are provided at the weld joints of the transverse tie rod 11 and the longitudinal tie rod 12.

[0041] The large thin-walled cylinder 1 has multiple support frames 2 at both ends of its axial direction, and the multiple support frames 2 are arranged in an upper and lower position.

[0042] Preferably, there are four support frames 2, which are evenly arranged in a circle along the axial projection direction of the large thin-walled cylinder 1. Figure 2 As shown, this allows for a more uniform stress distribution on the large thin-walled cylinder 1.

[0043] This embodiment also proposes a method for using the clamping fixture for machining large thin-walled cylinders as described above. The method includes the following steps: S1. Place the large thin-walled cylinder 1 horizontally, adjust the length of the support frame 2 to be less than the inner diameter of the large thin-walled cylinder 1, install the support frame 2 at both ends of the large thin-walled cylinder 1, and adjust the length of the support frame 2 at both ends of the large thin-walled cylinder 1 so that the two ends of the support frame 2 (i.e. the first support arc plate 3 and the second support arc plate 7) abut against the inner wall of the large thin-walled cylinder 1, and make the roundness error of the large thin-walled cylinder 1 ≤ 1mm. Specifically, before S1, the first support arc plate 3, the first threaded rod 4, the sleeve 5, the second threaded rod 6, and the second support arc plate 7 are sequentially threaded together to complete the assembly of the support frame 2.

[0044] The length of the support frame 2 can be adjusted by turning the middle part of the sleeve 5 with a wrench or other tools to achieve synchronous extension and retraction of the first threaded rod 4 and the second threaded rod 6; or the middle parts of the first threaded rod 4 and the second threaded rod 6 can be turned separately with a wrench or other tools to achieve extension and retraction of the first threaded rod 4 and the second threaded rod 6.

[0045] S2. Move the large thin-walled cylinder 1 to the worktable, set the pressure plate device 14 on the outer periphery of the large thin-walled cylinder 1, complete the clamping, and carry out processing.

[0046] The pressure plate device 14 includes a pressure plate, a pad box, and a tie rod, which presses and supports the outer wall of the large thin-walled cylinder 1 to improve stability during processing. The pressure plate device 14 is a common tool in the field and will not be described in detail in this embodiment.

[0047] The usage method also includes: S3. After processing, adjust the length of the support frame 2 to be less than the inner diameter of the large thin-walled cylinder 1, remove the support frame 2, and check the deformation of the large thin-walled cylinder 1 to ensure that the deformation is controlled within 0.1% of the total height.

[0048] For large, thin-walled cylindrical bodies with large-diameter pipe connections, S1 also includes: Weld the connecting rod 13 of the reinforcing frame 10 to the opening of the large-diameter pipe connection hole, and tighten the bolts at the welded joints of the transverse tie rod 11 and the longitudinal tie rod 12.

[0049] Among them, the transverse tie rod 11 and the longitudinal tie rod 12 are reserved for machining allowance and are processed simultaneously with the large thin-walled cylinder 1 to effectively avoid stress concentration.

[0050] Example 2 The rest of the content of this embodiment is the same as that of embodiment 1, except that: A support frame is provided at each of the two axial ends of the large thin-walled cylinder.

[0051] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0052] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A clamping fixture for machining large thin-walled cylinders, characterized in that: The clamping fixture includes support frames (2) respectively disposed at both axial ends of the large thin-walled cylinder (1); The two ends of the support frame (2) abut against the inner wall of the large thin-walled cylinder (1), and the length of the support frame (2) is adjustable.

2. The clamping fixture for machining large thin-walled cylinders according to claim 1, characterized in that: The support frame (2) includes a first support arc plate (3), a first threaded rod (4), a sleeve (5), a second threaded rod (6), and a second support arc plate (7) connected in sequence by threads. The first threaded rod (4) has a first thread at both ends, and the second threaded rod (6) has a second thread at both ends, with the first thread and the second thread having opposite directions of rotation. The sleeve (5) has a threaded hole at one end in the axial direction that matches the first thread, and the sleeve (5) has a threaded hole at the other end in the axial direction that matches the second thread. The first support arc plate (3) has a threaded hole that matches the first thread, and the second support arc plate (7) has a threaded hole that matches the second thread. The thread engagement length between the first threaded rod (4) and the sleeve (5) is adjustable, and the thread engagement length between the second threaded rod (6) and the sleeve (5) is adjustable; The first supporting arc plate (3) and the second supporting arc plate (7) respectively abut against the inner wall of the large thin-walled cylinder (1).

3. The clamping fixture for machining large thin-walled cylinders according to claim 2, characterized in that: The first supporting arc plate (3) and the second supporting arc plate (7) both include a connecting cylinder (8) and an arc plate (9) connected to each other; The connecting cylinder (8) of the first supporting arc plate (3) is provided with a threaded hole that matches the first thread, and the connecting cylinder (8) of the second supporting arc plate (7) is provided with a threaded hole that matches the second thread; The arc plate (9) abuts against the inner wall of the large thin-walled cylinder (1), and the curvature of the arc plate (9) is adapted to the curvature of the inner wall of the large thin-walled cylinder (1).

4. The clamping fixture for machining large thin-walled cylinders according to claim 2, characterized in that: The middle cross-section of the first threaded rod (4) and the middle cross-section of the second threaded rod (6) are both hexagonal.

5. The clamping fixture for machining large thin-walled cylinders according to claim 1, characterized in that: The clamping fixture also includes a reinforcing frame (10), which is disposed at the large-diameter pipe connection hole inside the large thin-walled cylinder (1). The reinforcing frame (10) includes a grid-shaped structure formed by welding together at least two transverse tie rods (11) and two longitudinal tie rods (12); Connecting rods (13) are fixed at both ends of the transverse tie rod (11) and the two ends of the longitudinal tie rod (12). The connecting rods (13) are welded to the inner wall of the large thin-walled cylinder (1), and the welding point is located at the opening of the large-diameter pipe connection hole.

6. The clamping fixture for machining large thin-walled cylinders according to claim 5, characterized in that: Bolts are provided at the weld joints of the transverse tie rod (11) and the longitudinal tie rod (12).

7. The clamping fixture for machining large thin-walled cylinders according to claim 1, characterized in that: The large thin-walled cylinder (1) has a support frame (2) at each of its axial ends.

8. The clamping fixture for machining large thin-walled cylinders according to claim 1, characterized in that: The large thin-walled cylinder (1) has multiple support frames (2) at both ends of its axial direction, and the multiple support frames (2) are arranged in an upper and lower position.

9. A method of using a clamping fixture for machining large thin-walled cylinders as described in any one of claims 1 to 8, characterized in that: The method of use includes the following steps: S1. Place the large thin-walled cylinder (1) horizontally, adjust the length of the support frame (2) to be less than the inner diameter of the large thin-walled cylinder (1), install the support frame (2) at both ends of the large thin-walled cylinder (1) in the axial direction, adjust the length of the support frame (2) at both ends of the large thin-walled cylinder (1) in the axial direction, so that both ends of the support frame (2) abut against the inner wall of the large thin-walled cylinder (1), and make the roundness error of the large thin-walled cylinder (1) ≤1mm; S2. Move the large thin-walled cylinder (1) to the worktable, set the pressure plate device (14) on the outer periphery of the large thin-walled cylinder (1), complete the clamping, and carry out processing.

10. The method of using the clamping fixture for machining large thin-walled cylinders according to claim 9, characterized in that: The method of use also includes: S3. After processing, adjust the length of the support frame (2) to be smaller than the inner diameter of the large thin-walled cylinder (1), remove the support frame (2), and check the deformation of the large thin-walled cylinder (1).

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