A machining floating self-centering inner hole turning clamp

Abstract

The utility model relates to mechanical processing manufacturing technical field, especially a kind of machining floating self-centering inner hole turning fixture, including workbench, workpiece and the centering fixture mechanism for the centering clamping of workpiece;The centering fixture mechanism includes first abutting block and second abutting block, first connecting seat and second connecting seat, mounting seat, connecting assembly and adjusting assembly.A kind of machining floating self-centering inner hole turning fixture workpiece is placed on workbench, adjusting assembly drives first connecting seat and second connecting seat relative movement, so that first abutting block and second abutting block gradually clamp workpiece;With the increase of clamping force, first abutting block and second abutting block are adjusted direction relative to first connecting seat and second connecting seat under the action of connecting assembly, to ensure that workpiece is tightly and evenly clamped and aligned center.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing and manufacturing technology, and in particular to a floating self-centering internal hole turning fixture for mechanical processing. Background Technology

[0002] In machining processes, when turning, milling, or drilling workpieces that are ring-shaped, cylindrical, or have curved inner walls, it is essential to precisely fix them on the worktable or machine tool and ensure that the center of the workpiece is aligned with the center of the machine tool spindle. This process is called centering and clamping. Traditional centering fixtures often use three-jaw chucks or rigid expansion mandrels. While three-jaw chucks are versatile, they can easily cause uneven clamping force for non-standard inner diameters or thin-walled workpieces, leading to workpiece deformation or insufficient centering accuracy. Rigid expansion mandrels, on the other hand, require custom-made designs for specific hole diameters, lacking flexibility and versatility.

[0003] In addition, due to potential machining errors, ovality, or uneven surfaces on the inner wall of the workpiece, a completely rigid clamping block may cause stress concentration upon contact, scratching the workpiece surface, or insufficient contact area may lead to unreliable clamping, resulting in displacement during processing and affecting machining accuracy and product quality. Utility Model Content

[0004] This utility model solves the problems in related technologies and proposes a floating self-centering internal hole turning fixture for machining. The connecting component ensures that the first and second clamping blocks can adaptively adjust their angles when clamping the workpiece to better fit the inner wall of the workpiece. The adjusting component achieves the centering and clamping of the workpiece by driving the first and second connecting seats to move synchronously in opposite directions.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: a floating self-centering internal hole turning fixture for machining, including a worktable, a workpiece, and a centering fixture mechanism for centering and clamping the workpiece. The centering fixture mechanism includes: The first abutting block and the second abutting block are mirror images of each other, and their outer sides are set as arc surfaces for contacting the inner wall of the workpiece. A first connecting seat and a second connecting seat, wherein the first connecting seat is connected to a first abutting block, and the second connecting seat is connected to a second abutting block; The mounting base is fixedly disposed on the workbench surface, and the first connecting base and the second connecting base are hinged to the mounting base by a connecting pin. A connecting component is disposed between the first abutment block and the first connecting seat and between the second abutment block and the second connecting seat, the connecting component enabling the first abutment block and the second abutment block to adaptively float and rotate relative to their corresponding first and second connecting seats; An adjustment component is disposed below the workbench surface and connected to the first connecting seat and the second connecting seat, for driving the first connecting seat and the second connecting seat to move synchronously toward or away from each other. The centering clamp mechanism is symmetrically arranged about the central axis of the adjustment component.

[0006] By adopting the above technical solution, the worktable provides the mounting base on which the workpiece is placed for processing; the first and second clamping blocks contact the inner wall of the workpiece through their arc surfaces, keeping them axially aligned; the first and second connecting seats are respectively connected to the first and second clamping blocks, and are hinged to the mounting base through connecting pins, allowing the clamping blocks to float and rotate freely relative to the connecting seats; the connecting assembly ensures that the first and second clamping blocks can adaptively adjust their angles when clamping the workpiece to better fit the inner wall of the workpiece; the adjusting assembly achieves centering and clamping of the workpiece by driving the first and second connecting seats to move synchronously towards or away from each other.

[0007] As a preferred embodiment, the connecting assembly includes a connecting pin and a tension spring; The connecting pin passes through the first connecting seat and the second connecting and is rotatably connected to the first abutting block and the second abutting block respectively; One end of the tension spring is connected to the inside of the connecting seat, and the other end is connected to the inside of the mounting hole provided on the first and second abutting blocks.

[0008] By employing the above technical solution, the connecting pin allows the first and second clamping blocks to rotate freely around it. The tension spring provides the necessary elastic force, ensuring that the first and second clamping blocks maintain pressure on the inner wall of the workpiece at all times. This ensures that when the actual contour of the workpiece changes, the first and second clamping blocks can automatically adjust their angles to maintain a tight fit against the workpiece. This floating connection structure increases the contact area, making the applied clamping force distribution more uniform, avoiding stress concentration, and reducing scratches caused by clamping. It is particularly suitable for precision or machined workpiece surfaces.

[0009] As a preferred embodiment, the adjustment assembly includes: an adjustment screw, which is rotatably connected to the worktable surface; An adjusting sleeve is connected to the lower middle part of the adjusting screw via a threaded structure; A pair of connecting plates, the two ends of which are respectively hinged to the two sides of the adjusting screw sleeve and the first connecting seat and the second connecting seat.

[0010] One end of the adjusting screw is fixedly provided with a limit ring to prevent it from detaching from the worktable, and the end of the adjusting screw is provided with a handwheel.

[0011] By adopting the above technical solution, the adjusting screw is rotatably connected to the worktable surface, undertaking the rotation function for adjusting position through rotation. The adjusting screw sleeve is connected to the lower middle part of the adjusting screw through a threaded structure, and can move along its axial direction under the rotation of the adjusting screw to achieve height adjustment. A pair of connecting plates are respectively hinged to both sides of the adjusting screw sleeve and the first and second connecting seats, ensuring the flexibility of the connection and allowing relative rotation between components. A limit retaining ring is fixedly set at one end of the adjusting screw to prevent it from detaching from the worktable surface, improving the stability of the device. A handwheel is located at the end of the adjusting screw, allowing the operator to drive the adjusting screw to rotate by turning the handwheel.

[0012] As a preferred embodiment, the workbench surface is provided with elongated clearance holes that are adapted to the movement trajectories of the first connecting seat and the second connecting seat.

[0013] By adopting the above technical solution, the elongated clearance holes on the worktable ensure the accuracy of the movement paths of the first and second connecting seats during movement, ensuring that their movement trajectories match the shape and size of the holes. The adjusting screw drives the adjusting sleeve to move linearly through rotation, causing the connecting plates hinged on both sides to move synchronously. The movement of the connecting plates causes the first and second connecting seats, as well as the first and second clamping blocks attached to them, to move accordingly along the clearance holes. This design ensures that the first and second connecting seats move symmetrically throughout the process, thereby precisely pushing the workpiece to move and keeping the center of the workpiece always aligned with the theoretical center of the fixture. This bidirectional movement ensures extremely high centering accuracy of the workpiece in the fixture, thereby improving the machining quality.

[0014] As a preferred embodiment, the arc surfaces of the first and second abutting blocks are surface polished.

[0015] By adopting the above technical solution, the arc-shaped surfaces of the first and second clamping blocks, after surface polishing, effectively reduce friction with the contacting components, improve the wear resistance of the structure, enhance the smoothness of the contact surfaces, and increase the fitting accuracy, ensuring greater stability and reliability of the equipment during operation. The first and second clamping blocks are responsible for providing radial and axial support respectively during equipment operation to maintain accurate axial and radial positioning between components. The polished arc-shaped surfaces further improve the smoothness of the contact area, reducing wear and vibration, thereby extending the service life of the equipment.

[0016] As a preferred embodiment, the adjusting screw sleeve and the connecting plate, as well as the connecting plate and the first connecting seat and the second connecting seat, are all hinged by pins.

[0017] By adopting the above technical solution, the adjusting screw sleeve is hinged to the connecting plate through a pin, so that the adjusting screw sleeve can rotate relative to the connecting plate, thereby adjusting the angle or position as needed; the connecting plate is hinged to the first connecting seat and the second connecting seat through another pin, so that the connecting plate can move flexibly between the first connecting seat and the second connecting seat. The combination of the two makes the whole structure highly flexible and adaptable.

[0018] Compared with the prior art, the beneficial effects of this utility model are: This utility model: 1. Adaptive floating clamping to protect the workpiece surface: Through the floating connection structure composed of connecting pins and tension springs, the first and second abutment blocks can rotate slightly when contacting the inner wall of the workpiece, automatically adjusting the angle to conform to the actual contour of the inner wall of the workpiece. This not only increases the contact area and makes the clamping force evenly distributed, avoiding stress concentration, but also effectively prevents scratches on the surface of precision or machined workpieces.

[0019] 2. High centering accuracy and stable clamping: The adjusting screw drives the adjusting sleeve to move linearly, and through the connecting plates on both sides, it synchronously pushes the first and second connecting seats and the first and second clamping blocks to move along the clearance holes, ensuring the symmetry and accuracy of the bidirectional movement, so that the center of the workpiece always coincides with the theoretical center of the fixture, resulting in extremely high centering accuracy and ensuring the processing quality.

[0020] 3. High versatility and wide applicability: The distance between the first and second clamping blocks can be steplessly adjusted by rotating the adjusting screw, thus adapting to the inner holes of workpieces with different diameters within a certain range. It is a multi-purpose tool, reducing the cost and time of replacing special fixtures and improving equipment utilization.

[0021] 4. Compact structure and easy operation: The entire mechanism is integrated on the worktable, with a reasonable structural design and reliable operation. Tightening or loosening the workpiece can be completed simply by turning a single adjusting screw, making it extremely convenient and efficient. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a floating self-centering internal hole turning fixture for machining according to this utility model; Figure 2 This is a schematic diagram of the centering fixture mechanism in a floating self-centering internal hole turning fixture for machining according to this utility model; Figure 3 This utility model relates to a floating self-centering internal hole turning fixture for machining. Figure 1A schematic diagram of the structure in a partial half-section view; Figure 4 This utility model relates to a floating self-centering internal hole turning fixture for machining. Figure 3 A structural schematic diagram of the enlarged view at point A; Figure 5 This is a structural schematic diagram of the tension spring assembly in a floating self-centering inner hole turning fixture for machining, according to this utility model.

[0023] In the picture: 100. Worktable surface; 101. Clearance hole; 200. Workpiece; 21. First clamping block; 22. Second clamping block; 31. First connecting seat; 32. Second connecting seat; 33. Mounting seat; 331. Connecting pin; 41. Adjusting screw; 411. Limiting retaining ring; 42. Adjusting sleeve; 5. Connecting plate; 6. Tension spring; 61. Mounting hole; 7. Connecting pin. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0027] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0028] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0029] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0030] Please refer to details. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 A floating self-centering internal hole turning fixture for machining includes a worktable 100, a workpiece 200, and a centering fixture mechanism for centering and clamping the workpiece 200. The centering clamp mechanism includes: The first abutting block 21 and the second abutting block 22 are mirror images of each other, and their outer sides are set as arc surfaces for contacting the inner wall of the workpiece 200. The first connecting seat 31 and the second connecting seat 32 are connected, the first connecting seat 31 is connected to the first abutting block 21, and the second connecting seat 32 is connected to the second abutting block 22; Mounting base 33 is fixedly set on workbench 100, and first connecting base 31 and second connecting base 32 are hinged to mounting base 33 via connecting pin 331; A connecting component is disposed between the first abutting block 21 and the first connecting seat 31 and between the second abutting block 22 and the second connecting seat 32. The connecting component enables the first abutting block 21 and the second abutting block 22 to adaptively float and rotate relative to their corresponding first connecting seat 31 and second connecting seat 32. An adjustment component is located below the worktable 100 and is connected to the first connecting seat 31 and the second connecting seat 32, and is used to drive the first connecting seat 31 and the second connecting seat 32 to move synchronously towards or away from each other. The centering clamping mechanism is symmetrically arranged about the central axis of the adjusting assembly. The worktable 100 provides the mounting base on which the workpiece 200 is placed for processing. The first clamping block 21 and the second clamping block 22 contact the inner wall of the workpiece 200 through their arc surfaces, keeping them axially aligned. The first connecting seat 31 and the second connecting seat 32 are respectively connected to the first clamping block 21 and the second clamping block 22, and are hinged to the mounting seat 33 through the connecting pin 331, so that the clamping blocks can float and rotate freely relative to the connecting seat. The connecting assembly ensures that the first clamping block 21 and the second clamping block 22 can adaptively adjust their angles when clamping the workpiece 200 to better fit the inner wall of the workpiece 200. The adjusting assembly achieves the centering and clamping of the workpiece 200 by driving the first connecting seat 31 and the second connecting seat 32 to move synchronously towards or away from each other. The overall working principle is as follows: First, the workpiece 200 is placed on the worktable 100. The adjusting component drives the first connecting seat 31 and the second connecting seat 32 to move relative to each other, so that the first clamping block 21 and the second clamping block 22 gradually clamp the workpiece 200. As the clamping force increases, the first clamping block 21 and the second clamping block 22 can freely adjust their direction relative to the first connecting seat 31 and the second connecting seat 32 under the action of the connecting component, so as to ensure that the workpiece 200 is tightly and evenly clamped and aligned with the center.

[0031] Please refer to details. Figure 2 , Figure 3 , Figure 4 and Figure 5 The connecting assembly includes a connecting pin 7 and a tension spring 6; The connecting pin 7 passes through the first connecting seat 31 and the second connecting seat and is rotatably connected to the first abutting block 21 and the second abutting block 22 respectively; Please refer to details. Figure 5 One end of the tension spring 6 is connected to the inner side of the connecting seat, and the other end is connected to the inner side of the mounting hole 61 provided on the first abutment block 21 and the second abutment block 22. The connecting pin 7 allows the first abutment block 21 and the second abutment block 22 to rotate freely around it. The tension spring 6 provides the necessary elastic force to ensure that the first abutment block 21 and the second abutment block 22 always maintain pressure on the inner wall of the workpiece 200, ensuring that the first abutment block 21 and the second abutment block 22 can automatically adjust their angles to fit tightly against the workpiece 200 when the actual contour of the workpiece 200 changes. This floating connection structure can increase the contact area, make the applied clamping force distribution more uniform, avoid stress concentration, and reduce scratches caused by clamping, which is particularly suitable for the surface of precision or machined workpieces 200. Its working principle is to transmit force through the connecting pin 7, while the tension spring 6 provides elastic force so that the abutment blocks can automatically adapt to changes in the contour of the workpiece 200, achieving uniform clamping and protecting the surface of the workpiece 200.

[0032] Please refer to details. Figure 2 , Figure 3 and Figure 4 The adjustment assembly includes: an adjustment screw 41, which is rotatably connected to the worktable surface 100; Adjusting sleeve 42 is connected to the lower middle part of adjusting screw 41 via a threaded structure; A pair of connecting plates 5, with their two ends respectively hinged to both sides of the adjusting screw sleeve 42 and the first connecting seat 31 and the second connecting seat 32.

[0033] A limit ring 411 is fixedly provided at one end of the adjusting screw 41 to prevent it from detaching from the worktable 100. A handwheel is provided at the end of the adjusting screw 41. The adjusting screw 41 is rotatably connected to the worktable 100 and performs rotational function to adjust its position. The adjusting screw sleeve 42 is connected to the lower middle part of the adjusting screw 41 through a threaded structure and can move along its axial direction under the rotation of the adjusting screw 41 to achieve height adjustment. A pair of connecting plates 5 are respectively hinged to both sides of the adjusting screw sleeve 42 and the first connecting seat 31 and the second connecting seat 32, ensuring the flexibility of the connection and allowing relative rotation between components. The limit ring 411 is fixedly provided at one end of the adjusting screw 41 to prevent it from detaching from the worktable 100 and improves the stability of the device. The handwheel is located at the end of the adjusting screw 41, making it convenient for the operator to drive the adjusting screw 41 to rotate by turning the handwheel. In summary, the working principle of this adjustment component is as follows: the adjustment screw 41 is driven to rotate by rotating the handwheel, and the adjustment screw 41 drives the adjustment sleeve 42 to move up and down. The adjustment sleeve 42 is connected to the first connecting seat 31 and the second connecting seat 32 through the connecting plate 5, thereby realizing the relative position adjustment of the connection parts and achieving the purpose of precise positioning and adjustment of the overall structure.

[0034] Please refer to details. Figure 1 and Figure 3 The worktable 100 is provided with elongated clearance holes 101 that are adapted to the movement trajectories of the first connecting seat 31 and the second connecting seat 32. The elongated clearance holes 101 on the worktable 100 ensure the accuracy of the path of the first connecting seat 31 and the second connecting seat 32 during movement, ensuring that their movement trajectories match the shape and size of the holes. The adjusting screw 41 drives the adjusting sleeve 42 to move linearly by rotation, causing the connecting plates 5 hinged on both sides to move synchronously. The movement of the connecting plates 5 causes the first connecting seat 31 and the second connecting seat 32, as well as the first abutment block 21 and the second abutment block 22 attached thereto, to move accordingly along the clearance holes 101. This design ensures that the first connecting seat 31 and the second connecting seat 32 always move symmetrically during movement, thereby accurately pushing the workpiece 200 to move, keeping the center of the workpiece 200 always aligned with the theoretical center of the fixture. This bidirectional movement ensures extremely high centering accuracy of the workpiece 200 in the fixture, thereby improving machining quality.

[0035] Please refer to details. Figure 2The arc surfaces of the first abutment block 21 and the second abutment block 22 are surface-polished. This surface polishing effectively reduces friction between the abutment blocks 21 and 22 and the contacting components, improves the wear resistance of the structure, enhances the smoothness of the contact surfaces, strengthens the fit accuracy, and ensures greater stability and reliability of the equipment during operation. The first abutment block 21 and the second abutment block 22 provide radial and axial support respectively during equipment operation to maintain accurate axial and radial positioning between components. The polished arc surfaces further improve the smoothness of the contact area, reduce wear and vibration, and thus extend the service life of the equipment.

[0036] Please refer to the details. Figure 2 and Figure 3 The adjusting screw sleeve 42 is hinged to the connecting plate 5, and the connecting plate 5 is hinged to the first connecting seat 31 and the second connecting seat 32, both via pins. The adjusting screw sleeve 42, hinged to the connecting plate 5 via pins, allows the adjusting screw sleeve 42 to rotate relative to the connecting plate 5, thus adjusting the angle or position as needed. The connecting plate 5, hinged to the first connecting seat 31 and the second connecting seat 32 via another pin, allows the connecting plate 5 to move flexibly between the first connecting seat 31 and the second connecting seat 32. The combination of these two mechanisms gives the entire structure a high degree of flexibility and adaptability. Specifically, the working principle is as follows: First, the adjusting screw sleeve 42, hinged to the connecting plate 5 via pins, allows the adjusting screw sleeve 42 to rotate freely relative to the connecting plate 5, thereby achieving angle adjustment. Second, the connecting plate 5, hinged to the first connecting seat 31 and the second connecting seat 32 via pins, allows it to easily slide or rotate between them, further enhancing the flexibility of the structure.

[0037] In this embodiment, during operation, the workpiece 200 is fitted over the first and second abutment blocks. Rotating the adjusting screw 41 drives the adjusting sleeve 42 to move downwards. The adjusting sleeve 42, through the connecting plates 5 on both sides, synchronously pushes the first connecting seat 31 and the second connecting seat 32 to slide laterally along the clearance hole 101, thereby causing the first and second abutment blocks 21 and 22 to move outwards, contacting and pressing against the inner wall of the workpiece 200. At the moment of contact, if the inner wall of the workpiece 200 is not perfectly circular, the tension spring 6 will be compressed or stretched, allowing the first and second abutment blocks to rotate slightly around the connecting pin 7 until their outer arc completely adheres to the inner wall of the workpiece 200, achieving uniform clamping. To release, simply rotate the adjusting screw 41 in the opposite direction.

[0038] The above are preferred embodiments of this utility model. Those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above. Any obvious improvements, substitutions or modifications made by those skilled in the art based on this utility model shall fall within the protection scope of this utility model.

Claims

1. A mechanical machining fixture for floating self-centering internal hole turning, characterized in that: It includes a worktable (100), a workpiece (200), and a centering fixture mechanism for centering and clamping the workpiece (200); The centering clamp mechanism includes: The first abutting block (21) and the second abutting block (22) are mirror images of each other, and their outer sides are set as arc surfaces for contacting the inner wall of the workpiece (200); The first connecting seat (31) and the second connecting seat (32) are connected, the first connecting seat (31) is connected to the first abutting block (21), and the second connecting seat (32) is connected to the second abutting block (22); Mounting base (33) is fixedly mounted on the workbench (100), and the first connecting base (31) and the second connecting base (32) are hinged to the mounting base (33) via connecting pin (331); A connecting component is disposed between the first abutment block (21) and the first connecting seat (31) and between the second abutment block (22) and the second connecting seat (32), the connecting component enabling the first abutment block (21) and the second abutment block (22) to adaptively float and rotate relative to their corresponding first connecting seat (31) and second connecting seat (32); An adjustment component is disposed below the worktable (100) and connected to the first connecting seat (31) and the second connecting seat (32) for driving the first connecting seat (31) and the second connecting seat (32) to move synchronously towards or away from each other. The centering clamp mechanism is symmetrically arranged about the central axis of the adjustment component.

2. The floating self-centering internal hole turning fixture according to claim 1, characterized in that: The connecting assembly includes a connecting pin (7) and a tension spring (6); The connecting pin (7) passes through the first connecting seat (31) and the second connecting and is rotatably connected to the first abutting block (21) and the second abutting block (22) respectively; One end of the tension spring (6) is connected to the inside of the connecting seat, and the other end is connected to the inside of the mounting hole (61) provided on the first abutment block (21) and the second abutment block (22).

3. A floating self-centering internal hole turning fixture according to claim 2, characterized in that: The adjustment assembly includes: an adjustment screw (41) which is rotatably connected to the worktable (100); Adjusting sleeve (42) is connected to the lower middle part of the adjusting screw (41) by means of a threaded structure; A pair of connecting plates (5) are hinged at both ends to the two sides of the adjusting screw sleeve (42) and the first connecting seat (31) and the second connecting seat (32), respectively.

4. A floating self-centering internal hole turning fixture according to claim 3, characterized in that: One end of the adjusting screw (41) is fixedly provided with a limit stop ring (411), and the end of the adjusting screw (41) is provided with a handwheel.

5. A floating self-centering internal hole turning fixture according to claim 4, characterized in that: The workbench (100) is provided with an elongated clearance hole (101) that is adapted to the movement trajectory of the first connecting seat (31) and the second connecting seat (32).

6. A floating self-centering internal hole turning fixture according to claim 5, characterized in that: The arc surfaces of the first abutting block (21) and the second abutting block (22) are polished.

7. A floating self-centering internal hole turning fixture according to claim 6, characterized in that: The adjusting screw sleeve (42) and the connecting plate (5), as well as the connecting plate (5) and the first connecting seat (31) and the second connecting seat (32), are all hinged by pins.

Images