A variable cross-section rod type part clamping device

Abstract

The application relates to a variable cross-section rod part clamping device, which comprises a clamping plate with a hollow area for accommodating a part; a plurality of through holes are arranged on the clamping plate in a ring shape and face the hollow area; a plurality of abutting rods are respectively arranged in the through holes and axially move along the through holes; and a fixing assembly is arranged on the through hole and is used for limiting the axial movement of the abutting rods after the abutting rods abut against the part. No matter whether the cross section of the part is ladder-shaped, tapered or other irregular shapes, a plurality of scalable abutting rods are arranged in the ring shape of the hollow area for accommodating the part, the profile of the part is adjusted through axial adjustment, the part is abutted in multiple directions, the part is stably arranged in the hollow area, the device is no longer limited to regular cross-section parts, and after the fixing assembly is locked, the clamping force is stable, the part is prevented from sliding or falling off, and compared with a bolt tightening structure in the prior art, the device has better stability.

Description

Technical Field

[0001] This application relates to the field of fixed clamping technology, and in particular to a clamping device for variable cross-section rod parts. Background Technology

[0002] Rod-shaped parts, as common basic components in the field of machining, are widely used in industries such as aerospace, automotive manufacturing, and precision instruments. With the increasing complexity of manufacturing structures, the application demand for variable cross-section rod-shaped parts is growing. For precision variable cross-section rod-shaped parts, the challenge of clamping and fixing them during storage or transportation is present, specifically manifested in the following ways:

[0003] In the prior art, clamping devices for rod-like parts mostly adopt bolt tightening structures or large fixed clamps, but they are only suitable for parts with regular cross-sections. For rod-like parts with variable cross-sections, due to their irregular shape, it is difficult to adjust the clamping force to match them, which can lead to parts sliding, tilting, or even falling off and damaging the parts. Therefore, the existing clamping devices for rod-like parts cannot meet the clamping requirements of rod-like parts with variable cross-sections. Utility Model Content

[0004] This application provides a clamping device for variable cross-section rod parts to solve the problem in related technologies where, due to the irregular shape of variable cross-section rod parts, it is difficult to adjust the clamping force to match them during storage or transportation, resulting in unstable clamping and causing the parts to fall off and be damaged.

[0005] A clamping device for variable cross-section rod-type parts is provided, comprising: a clamping plate having a hollow region in its middle for accommodating the parts; a plurality of through holes circumferentially provided in the clamping plate and facing the hollow region; a plurality of abutment rods respectively passing through the through holes and moving axially along the through holes; and a fixing assembly disposed in the through holes for restricting the axial movement of the abutment rods after the plurality of abutment rods abut the parts.

[0006] In some embodiments, the fixing component includes a ball bearing mounting cylinder and a bushing; the ball bearing mounting cylinder has an internally hollowed-out structure; the ball bearing mounting cylinder is fixed in a through hole by a connector, and a first space is left between its periphery and the inner wall of the through hole; a through groove is provided on the cylinder wall of the ball bearing mounting cylinder, and a ball bearing that moves along its axial direction is installed in the through groove; a plurality of grooves are provided on the supporting rod along its length direction; the supporting rod penetrates the interior of the ball bearing mounting cylinder and is in close contact with the cylinder wall of the ball bearing mounting cylinder; the bushing moves in the first space, squeezing the ball bearing and holding it against the groove.

[0007] In some embodiments, the outer surface of the bushing has an external thread structure, the inner wall of the through hole has an internal thread structure, and the bushing is screwed into the first space through a threaded connection.

[0008] In some embodiments, the wall of the ball bearing mounting cylinder is provided with multiple through grooves along its length, and each through groove is equipped with a ball that moves along its axial direction, forming a through groove unit.

[0009] In some embodiments, the circumferentially spaced through-groove units are provided on the wall of the ball bearing mounting cylinder.

[0010] In some embodiments, the inner wall of the through hole near the hollow area is provided with a first abutting groove; one end of the ball bearing mounting cylinder is provided with a fixing cap that abuts against the first abutting groove; the connecting member is a screw that passes through the fixing cap and is fixed in the clamping plate.

[0011] In some embodiments, the inner wall of the end of the through hole away from the hollow area is provided with a second abutment groove; the bushing is rotated into the first space and abuts against the second abutment groove by providing an abutment cap at the end.

[0012] In some embodiments, a rotating cap is provided at the end of the abutment rod away from the hollow area; the surfaces of the fixed cap, the abutment cap, and the rotating cap are all knurled.

[0013] In some embodiments, the clamping plate has a rectangular hollow cross section; the number of through holes is four, and the four through holes are respectively located at the center of the four sides of the clamping plate, and the axis of the four through holes is oriented towards the center of the hollow area.

[0014] In some embodiments, the end of the abutment rod that contacts the part is designed as a hemispherical structure.

[0015] The beneficial effects of the technical solution provided in this application include:

[0016] This application provides a clamping device for variable cross-section rod-like parts. The existing technology suffers from the inability to achieve stable, multi-directional, coordinated clamping of irregular variable cross-section rod-like parts. In this application, regardless of whether the part's cross-section is stepped, conical, or other irregular, multiple retractable and movable clamping rods are circumferentially distributed within the hollow region accommodating the part. These rods are axially adjusted to adapt to the part's contour, thereby achieving multi-directional clamping and ensuring the part remains stably positioned within the hollow region. This expands the device's capabilities beyond regular cross-section parts. Furthermore, once the fixing assembly is locked, the clamping force remains stable, preventing the part from sliding or falling off. Compared to the bolt-tightening structure in the prior art, this provides better stability. The axial movement of the clamping rods can be manually and quickly adjusted, and the fixing assembly facilitates quick locking or releasing of the clamping rods' axial movement. This solves the problem in related technologies where the irregular shape of variable cross-section rod-like parts makes it difficult to adjust the clamping force during storage or transportation, leading to unstable clamping and potential part detachment and damage. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the clamping device for holding parts according to an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of the clamping device provided in the embodiments of this application;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the clamping device provided in the embodiments of this application;

[0021] Figure 4 for Figure 3 Enlarged view of section A in the middle;

[0022] Figure 5 This is a schematic diagram of the structure of the ball bearing mounting cylinder provided in an embodiment of this application.

[0023] In the diagram: 1. Clamping plate; 2. Part; 3. Support rod; 31. Groove; 32. Rotating cap; 4. Fixing assembly; 5. Ball bearing mounting cylinder; 51. Through groove; 52. Ball; 53. Fixing cap; 6. Bushing; 61. Support cap; 7. Screw. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] To make the technical problem that this application aims to solve clearer, the causes of the technical problem will be analyzed in detail below.

[0026] Rod-type parts 2 are commonly used basic components in the field of machining and are widely used in industries such as aerospace, automobile manufacturing, and precision instruments. With the increasing complexity of manufacturing structures, the application demand for variable cross-section rod parts 2 is growing. For precision variable cross-section rod parts 2, the challenge of clamping and fixing them during storage or transportation is significant. Specifically: Existing clamping devices for rod parts 2 mostly employ bolt tightening structures or large fixing fixtures, but these are only suitable for parts with regular cross-sections. For variable cross-section rod parts 2, due to their irregular shape, it is difficult to adjust the clamping force to match them, leading to slippage, tilting, or even detachment and damage. Therefore, existing clamping devices for rod parts 2 cannot meet the clamping requirements of variable cross-section rod parts 2. Bolt tightening structures typically apply clamping force from a single radial direction, while the irregular contour of variable cross-section parts 2 requires multi-directional circumferential support. For example, traditional clamping devices cannot provide a stable clamping force for the concave parts of the variable cross-section rod. Therefore, there is an urgent need to design a highly adaptable clamping device that can accommodate various irregular contours of variable cross-section parts 2.

[0027] This application provides a clamping device for variable cross-section rod-type parts 2, which can solve the problem in related technologies that, due to the irregular shape of the variable cross-section rod-type parts 2, it is difficult to adjust the clamping force to match it during storage or transportation, resulting in unstable clamping and causing the parts 2 to fall off and be damaged.

[0028] refer to Figures 1 to 5 ,in Figure 1 This is a schematic diagram of the structure of the clamping device for holding part 2 provided in the embodiment of this application. A clamping device for a variable cross-section rod-type part 2 includes: a clamping plate 1, the middle of which has a hollow area for accommodating part 2; a plurality of through holes penetrating the clamping plate 1 and facing the hollow area in the circumferential direction of the clamping plate 1; a plurality of abutting rods 3, which are respectively disposed in the through holes and move axially along the through holes; and a fixing component 4, which is disposed in the through holes to restrict the axial movement of the abutting rods 3 after the plurality of abutting rods 3 abut against part 2.

[0029] By designing this clamping device, the shortcomings of existing technologies lie in their inability to achieve stable, multi-directional, coordinated clamping of irregularly shaped variable cross-section rod-like parts 2. In this application, regardless of whether the cross-section of part 2 is stepped, conical, or other irregular, multiple retractable and movable clamping rods 3 are circumferentially distributed within the hollow region accommodating part 2. By axially adjusting to adapt to the contour of part 2, multiple directions of clamping of part 2 are achieved, ensuring its stable position within the hollow region. This frees the clamping device from being limited to parts with regular cross-sections. Furthermore, after the fixing component is locked, the clamping force remains stable, preventing part 2 from sliding or falling off. Compared to the bolt-tightening structure in existing technologies, this provides better stability. The axial movement of the clamping rods 3 can be manually and quickly adjusted, and the fixing component facilitates quick locking or releasing of the axial movement of the clamping rods 3. This solves the problem in related technologies where, due to the irregular shape of variable cross-section rod-like parts 2, it is difficult to adjust the clamping force to match them during storage or transportation, leading to unstable clamping and damage to part 2.

[0030] In some preferred embodiments, the fixing component 4 includes a ball bearing mounting cylinder 5 and a bushing 6; the ball bearing mounting cylinder 5 has an internally hollowed-out structure; the ball bearing mounting cylinder 5 is fixed in the through hole by a connector, and a first space is left between its periphery and the inner wall of the through hole; the cylinder wall of the ball bearing mounting cylinder 5 is provided with a through groove 51, and a ball bearing 52 that moves along its axial direction is installed in the through groove 51; the abutment rod 3 is provided with a plurality of grooves 31 along its length direction; the abutment rod 3 penetrates the interior of the ball bearing mounting cylinder 5 and is in close contact with the cylinder wall of the ball bearing mounting cylinder 5; the bushing 6 moves in the first space, squeezing the ball bearing 52 and abutting it against the groove 31.

[0031] In this embodiment, conventional techniques for fixing the abutment rod 3 often employ bolt tightening or rigid clamping, which cannot simultaneously address both ease of adjustment and stability. Therefore, this embodiment defines the fixing components as a ball bearing mounting cylinder 5 and a bushing 6. The ball bearing mounting cylinder 5 is hollowed out and fixed to a through hole via a connector, leaving a first space between it and the inner wall of the through hole. A through groove 51 is provided in the cylinder wall, housing an axially movable ball bearing 52. A groove 31 is provided on the surface of the abutment rod 3, which passes through the ball bearing mounting cylinder 5 and engages with the bushing 6. Fixing is achieved by the bushing 6 pressing the ball bearing 52 into the groove 31. Bolt tightening requires multiple torque adjustments and is prone to loosening due to vibration; rigid clamping cannot adapt to the contour changes of the variable cross-section part 2. This solution utilizes the elastic abutment structure of the ball bearing 52 engaging with the groove 31. When the bushing 6 is screwed in, the ball bearing 52 is compressed and deformed, embedding into the groove 31, forming a multi-point contact locking state. This solves the torque adjustment problem of traditional bolt fixing and avoids the insufficient adaptability of rigid clamping.

[0032] In some preferred embodiments, the outer surface of the bushing 6 has an external thread structure, the inner wall of the through hole has an internal thread structure, and the bushing 6 is screwed into the first space through a threaded connection.

[0033] In this embodiment, the force transmission methods of existing fixing components are mostly rigid compression, such as wedge structures, or friction locking, such as spring collets. These methods suffer from drawbacks such as coarse force control and easy structural failure. Therefore, the outer surface of the bushing 6 is provided with external threads, and the inner wall of the through hole is provided with internal threads. The bushing 6 is screwed into the first space through the threaded connection, compressing the ball 52 into the groove 31 of the abutment rod 3. This solution converts rotational motion into axial thrust through precise transmission via the threaded connection. The compression force of the bushing 6 on the ball 52 can be quantitatively controlled by the screw-in ring, solving the problem of non-adjustable or coarse adjustment of clamping force in existing technologies. This solution is particularly suitable for precision variable cross-section parts 2. It should be noted that the thread specification can be flexibly adjusted according to the weight of the part 2 and the clamping force requirements. The same clamping plate 1 can be adapted to various load scenarios by replacing different specifications of bushing 6, reducing the cost of fixture customization.

[0034] In some preferred embodiments, the ball bearing mounting cylinder 5 has a plurality of through grooves 51 along its length on its cylinder wall, and each through groove 51 is fitted with a ball bearing 52 that moves along its axial direction, forming a through groove unit.

[0035] In this embodiment, the cylinder wall of the ball bearing mounting cylinder 5 is provided with multiple through grooves 51 along the length direction. Each through groove 51 contains an axially movable ball bearing 52, forming a through groove unit. Multiple balls bearing 52 simultaneously abut against the groove 31, which can disperse the concentrated load of a single ball bearing 52 into a uniform load, reduce the compressive stress on the surface of the abutting rod 3, prevent the groove 31 from undergoing plastic deformation due to long-term high stress, and extend the service life of the device. Multiple through grooves 51 along the length direction of the cylinder wall allow the balls bearing 52 to engage with the groove 31 at different axial positions, and the balls bearing 52 at different positions can abut against different positions of the abutting rod 3.

[0036] In some preferred embodiments, the circumferentially spaced through groove units are provided on the wall of the ball bearing mounting cylinder 5.

[0037] In this embodiment, the previous embodiment is further defined. Multiple through groove units are distributed circumferentially at equal intervals in the ball bearing mounting cylinder 5. The circumferentially distributed through groove units, such as four through grooves 51 distributed at ninety-degree intervals, can make it easier for the groove 31 of the abutment rod 3 to lock the ball 52 in the through groove 51, disperse the locking force, and at the same time reduce the coaxiality error after the part 2 is clamped, thus meeting the clamping requirements.

[0038] In some preferred embodiments, the inner wall of the through hole near the hollow area is provided with a first abutting groove; one end of the ball bearing mounting cylinder 5 is provided with a fixing cap 53 that abuts against the first abutting groove; the connecting member is a screw 7, which passes through the fixing cap 53 and is fixed in the clamping plate 1.

[0039] In this embodiment, a first abutting groove is provided at one end of the through hole near the hollow area. The ball bearing mounting cylinder 5 is abutted against the first abutting groove by setting a fixing cap 53 and is fixed with screws 7. The screws 7 connection allows the ball bearing mounting cylinder 5 to be quickly disassembled, which greatly shortens the disassembly time when replacing worn balls 52.

[0040] In some preferred embodiments, the inner wall of the end of the through hole away from the hollow area is provided with a second abutment groove; the bushing 6 rotates into the first space and abuts against the second abutment groove by providing an abutment cap 61 at the end.

[0041] In this embodiment, a second abutment groove is provided at the other end of the through hole, and the bushing 6 is abutted against the second abutment groove by the abutment cap 61. The cooperation between the abutment cap 61 and the second abutment groove can restrict the axial movement of the bushing 6 and prevent the bushing 6 from loosening due to vibration after being screwed in. Compared with the structure without abutment groove, the loosening rate of the bushing 6 is reduced.

[0042] In some preferred embodiments, a rotating cap 32 is provided at the end of the abutment rod 3 away from the hollow area; the surfaces of the fixing cap 53, the abutment cap 61 and the rotating cap 32 are all knurled.

[0043] In this embodiment, in the prior art, manually operated components such as knobs and caps often have smooth surfaces or simple textures, resulting in insufficient friction and difficult operation. For example, knobs with smooth surfaces are prone to slipping when operated while wearing gloves, requiring greater torque and causing operator fatigue; the uneven distribution of friction in simple textures may cause the component to jam during rotation. Therefore, a rotating cap 32 is provided at the end of the support rod 3 away from the hollow area, and the surfaces of the fixed cap 53, the support cap 61, and the rotating cap 32 are all knurled; this increases the frictional torque of the knurled surfaces, allowing the operator to rotate the component without excessive force, shortening the adjustment time per cycle. Furthermore, it should be noted that the knurling pattern can be customized, such as with different densities or directions, to distinguish components with different functions. For example, the knurling directions of the fixed cap 53 and the support cap 61 are opposite, reducing assembly errors.

[0044] In some preferred embodiments, the clamping plate 1 has a rectangular hollow cross section; the number of through holes is four, and the four through holes are respectively located at the center of the four sides of the clamping plate 1, and the axis of the four through holes is oriented towards the center of the hollow area.

[0045] In this embodiment, the clamping plate 1 and the number of through holes are specifically defined. The clamping plate 1 has a rectangular hollow cross-section, and four through holes are distributed at the center of the four sides, with the axes of the through holes all pointing towards the center of the hollow area. The four through holes are symmetrically distributed at ninety degrees. The holding rod 3 applies clamping force from four orthogonal directions, and the resultant force passes through the center of the cross-section of part 2, preventing part 2 from rotating or shifting and achieving stable clamping.

[0046] In some preferred embodiments, the end of the abutment rod 3 that contacts the part 2 is provided as a hemispherical structure.

[0047] In this embodiment, the contact ends of the abutment rod 3 are mostly planar or sharp, which can lead to stress concentration and damage to the surface of part 2. Therefore, the contact ends between the abutment rod 3 and part 2 are limited to a hemispherical structure. The contact area of ​​the hemispherical structure is larger than that of the planar end, reducing contact stress and avoiding damage to the surface of part 2. The hemispherical surface has a higher degree of fit with the surface of part 2. Even if there is a slight curvature on the surface of part 2, the hemispherical end can still form multi-point contact. Compared with the single-point contact of the planar end, this reduces the fluctuation of clamping force and improves the vibration resistance of part 2 during transportation. Furthermore, the hemispherical structure can adaptively contact the convex, concave, or planar surfaces of part 2. For example, when the cross-section of part 2 is curved, the hemispherical end can roll along the curved surface to maintain the best contact state, while the planar end may produce gaps due to the mismatch of the curvature of the curved surface.

[0048] The beneficial effects of this utility model include:

[0049] This application proposes a clamping device for variable cross-section rod-like parts 2. The deficiency in existing technologies lies in their inability to achieve stable, multi-directional, coordinated clamping of irregularly shaped variable cross-section rod-like parts 2. In this application, regardless of whether the cross-section of part 2 is stepped, conical, or other irregular, multiple retractable and movable abutment rods 3 are circumferentially distributed within the hollow region accommodating part 2. These rods are axially adjusted to adapt to the contour of part 2, thereby achieving multi-directional clamping of part 2 and ensuring its stable position within the hollow region. This eliminates the limitation of the clamping device on parts with regular cross-sections. Furthermore, after the fixing component is locked, the clamping force remains stable, preventing part 2 from sliding or falling off. Compared to the bolt-tightening structure in existing technologies, this provides better stability. The axial movement of the abutment rods 3 can be manually and quickly adjusted, and the fixing component facilitates quick locking or releasing of the axial movement of the abutment rods 3. This solves the problem in related technologies where the irregular shape of the variable cross-section rod-like parts 2 makes it difficult to adjust the clamping force during storage or transportation, leading to unstable clamping and potential damage to part 2.

[0050] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0051] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0052] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A clamping device for variable cross-section rod-type parts, characterized in that, It includes: The clamping plate (1) has a hollow area in its middle for accommodating the part (2); the clamping plate (1) is provided with a plurality of through holes in the circumferential direction, which penetrate the clamping plate (1) and face the hollow area; Multiple abutment rods (3) are respectively inserted into the through hole and move axially along the through hole; A fixing component (4) is provided in the through hole to restrict the axial movement of the abutment rods (3) after the abutment rods (3) abut against the part (2).

2. The clamping device for variable cross-section rod parts as described in claim 1, characterized in that: The fixing component (4) includes a ball bearing sleeve (5) and a bushing (6); The ball bearing mounting cylinder (5) has an internally hollowed-out structure; the ball bearing mounting cylinder (5) is fixed in the through hole by a connector, and a first space is left between its periphery and the inner wall of the through hole; the cylinder wall of the ball bearing mounting cylinder (5) is provided with a through groove (51), and a ball bearing (52) that moves along its axial direction is installed in the through groove (51). The abutment rod (3) has a plurality of grooves (31) along its length direction; the abutment rod (3) penetrates the interior of the ball mounting cylinder (5) and is in close contact with the cylinder wall of the ball mounting cylinder (5); the bushing (6) moves in the first space, squeezing the ball (52) and abutting it against the groove (31).

3. The clamping device for variable cross-section rod parts as described in claim 2, characterized in that: The outer surface of the bushing (6) has an external thread structure, and the inner wall of the through hole has an internal thread structure. The bushing (6) is screwed into the first space through a threaded connection.

4. The clamping device for variable cross-section rod parts as described in claim 2, characterized in that: The ball bearing mounting cylinder (5) has a plurality of through grooves (51) along its length direction on its cylinder wall. Each through groove (51) is equipped with a ball bearing (52) that moves along its axial direction, forming a through groove unit.

5. The clamping device for variable cross-section rod parts as described in claim 4, characterized in that: The ball bearing mounting cylinder (5) has multiple through slot units spaced at equal intervals in the circumferential direction on its cylinder wall.

6. The clamping device for variable cross-section rod parts as described in claim 2, characterized in that: The inner wall of the through hole near the hollow area is provided with a first abutment groove; One end of the ball bearing mounting cylinder (5) is provided with a fixing cap (53) that abuts against the first abutting groove; The connector is a screw (7) that passes through the fixing cap (53) and is fixed inside the clamping plate (1).

7. The clamping device for variable cross-section rod parts as described in claim 6, characterized in that: The inner wall of the end of the through hole away from the hollow area is provided with a second abutment groove; The bushing (6) is inserted into the first space and abuts against the second abutment groove by providing an abutment cap (61) at its end.

8. The clamping device for variable cross-section rod parts as described in claim 7, characterized in that: A rotating cap (32) is provided at the end of the abutment rod (3) away from the hollow area; The surfaces of the fixing cap (53), the supporting cap (61), and the rotating cap (32) are all knurled.

9. The clamping device for variable cross-section rod parts as described in claim 1, characterized in that: The clamping plate (1) has a rectangular hollow cross section; The number of through holes is four, and the four through holes are respectively located at the center of the four sides of the clamping plate (1), and the axis of the four through holes is oriented towards the center of the hollow area.

10. The clamping device for variable cross-section rod parts as described in claim 1, characterized in that: The end of the abutment rod (3) that contacts the part (2) is designed as a hemispherical structure.

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