Inner support clamp

Abstract

The utility model relates to the technical field of clamps, and provides an inner support clamp, which is used for fixing a workpiece with an inner hole and comprises a base, a support column, a clamp body and a clamping device. The supporting block is hinged to the supporting column and has a contracted state and an expanded state; the driving assembly is provided with a first push plate and a second push plate, and the first push plate and the second push plate are in movable contact with the two ends, in the vertical direction, of the supporting block correspondingly and used for driving the supporting block to be switched between the contraction state and the opening state; when the supporting block is in a contraction state, the outer edge is close to the center line of the supporting column; when the supporting block is in an open state, the outer edge of the supporting block is far away from the center line of the supporting column and abuts against the inner wall of the inner hole of the workpiece, and therefore the workpiece is fixed. The inner hole of the workpiece is used as a positioning and clamping reference, direct force application to the outer surface is avoided, and indentation, scratching or roundness distortion caused by clamping in the clamping process of the workpiece which is thin in wall and easy to deform or of which the outer surface is not subjected to finish machining is effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of clamp, concretely relates to a inner support clamp. BACKGROUND

[0002] In the manufacturing process such as machining, assembling and detecting, reliable clamping of workpieces (such as sleeves, flanges, bearing seats, gear hubs, etc.) with inner hole structure is the key link to ensure machining precision, consistent repeatability and operation safety. Such workpieces usually take inner holes as the main design reference or assembly reference, and the outer circles thereof can be irregular, rough, or even have local defects, which are difficult to be used as effective clamping reference surfaces. Although traditional outer clamping type clamps (such as three-jaw chucks, four-jaw chucks or mechanical vices, etc.) perform excellently when clamping shafts or disc parts with regular shape and good rigidity, they have many limitations for workpieces with thin walls, easy deformation or only taking inner holes as the only accurate positioning reference.

[0003] Firstly, the outer clamping method is easy to cause radial deformation or ovalization of the thin-walled workpiece under the action of clamping force, thereby affecting the size precision and shape and position tolerances of subsequent machining; secondly, if the outer surface of the workpiece is not machined or has casting / forging allowance, uneven clamping contact surface will cause uneven distribution of clamping force, which not only reduces the clamping stability, but also may leave pressure marks or scratches on the surface of the workpiece, affecting the appearance and function; thirdly, in high-precision applications (such as bearing seat inner hole grinding, gear hub end face milling, etc.), clamping with outer circle as reference will introduce reference conversion error, which is difficult to ensure the consistency of design reference and process reference, thereby weakening the overall manufacturing precision. SUMMARY

[0004] In view of the above deficiencies of the prior art, the technical problem to be solved by the utility model is to provide an inner support clamp, which switches the support block between the retracted state and the expanded state by pushing the support block pivoted on the support column in the vertical direction through the first push plate and the second push plate, so as to realize self-centering clamping of the inner hole of the workpiece. This kind of positioning and clamping reference with the inner hole of the workpiece as the reference avoids direct force on the outer surface, effectively preventing the workpiece with thin walls, easy deformation or unprocessed outer surface from being scratched or distorted in clamping process.

[0005] The utility model solves the technical problems by adopting the technical scheme that an inner support clamp is provided for fixing workpieces with inner holes, which comprises:

[0006] A base is provided with a support column extending in the vertical direction;

[0007] A support block is pivoted on the support column and has a retracted state and an expanded state;

[0008] The driving assembly has a first push plate and a second push plate with lifting and lowering settings. The first push plate and the second push plate respectively move and abut against the two ends of the support block in the vertical direction, and are used to drive the support block to switch between the retracted state and the extended state.

[0009] When the support block is in the retracted state, its outer edge is close to the center line of the support column;

[0010] When the support block is in the extended state, its outer edge is away from the center line of the support column and abuts against the inner wall of the inner hole of the workpiece.

[0011] In one of the aforementioned internal support fixtures, the support block has a support surface extending along the height direction of the support column, and the support block abuts against the inner wall of the inner hole of the workpiece through the support surface.

[0012] In one of the aforementioned internal support clamps, the support block has a connecting portion on the side near the support column, a connecting rod is rotatably provided on the connecting portion, and a hinge shaft is provided on the support column. The end of the connecting rod opposite to the connecting portion is rotatably connected to the hinge shaft for hinged connection of the support block to the support column.

[0013] In the aforementioned internal support fixture, the support column is symmetrically provided with support blocks on its opposite sides, and the two support blocks respectively abut against the inner wall of the inner hole of the workpiece.

[0014] In one of the aforementioned internal support clamps, the drive assembly further includes an adjusting bolt. The first push plate has a through hole, and the end of the support column has a threaded hole. One end of the adjusting bolt passes through the through hole and is screwed into the threaded hole. By turning the adjusting bolt to change its screwing depth, the first push plate is pushed to move in the vertical direction.

[0015] In one of the aforementioned internal support clamps, the drive assembly further includes an elastic element, one end of which abuts against the base and the other end against the second push plate. When the support block changes from the contracted state to the open state, the elastic element is compressed and undergoes elastic deformation.

[0016] In one of the aforementioned internal support clamps, a washer is provided between the ends of the first push plate and the support column, and one end of the adjusting bolt passes through the through hole and the washer in sequence and is screwed into the threaded hole.

[0017] In one of the aforementioned internal support clamps, the end of the support column away from the first push plate has a cylindrical mounting portion, the mounting portion is connected to the base, and the second push plate and the elastic member are both sleeved on the mounting portion.

[0018] In one of the aforementioned internal support clamps, the second push plate is provided with a through hole extending along its axial direction, and the second push plate is axially slidably fitted onto the mounting portion through the through hole.

[0019] In one of the aforementioned internal support clamps, the base is provided with a mounting groove, and the end of the elastic member away from the second push plate is accommodated in the mounting groove and abuts against the bottom of the groove, thereby providing positioning for the elastic member.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The first and second push plates push the support block hinged to the support column to rotate around the hinge point in the vertical direction, so that the support block switches between the contracted state and the open state, thereby realizing the self-centering clamping of the inner hole of the workpiece. This method uses the inner hole of the workpiece as the positioning and clamping reference, avoids direct force on the outer surface, and effectively prevents the workpiece with thin wall, easy deformation or unfinished outer surface from being indented, scratched or roundness distortion caused by clamping during the clamping process.

[0022] (2) The driving and resetting mechanism composed of adjusting bolts and elastic elements can achieve efficient and reliable clamping operation: clamping can be completed by manually turning the adjusting bolts. After loosening, the elastic elements will automatically reset without the need for an external power source. The first push plate and the second push plate work together to act on the upper and lower ends of the support block respectively, ensuring that the swing is stable and the force is balanced. The clamping force is adjustable, the response is fast and the resetting is reliable. It is especially suitable for the rapid clamping needs of thin-walled sleeves, flanges, gear hubs and other internal hole reference workpieces in small and medium batch, high flexibility and high cycle automated production.

[0023] (3) The coordinated design of the cylindrical mounting part and the base mounting groove significantly improves the system's motion stability and lifespan: the mounting part provides high-precision axial guidance for the second push plate, effectively constraining its radial degree of freedom and preventing swaying or tilting during the motion process; the mounting part provides circumferential constraint for the elastic element, and the mounting groove provides a definite axial reference for its bottom end. The two together suppress the lateral buckling of the elastic element during compression or rebound, ensuring that the deformation is carried out along the axial direction; this structure can also evenly distribute contact stress, reduce local wear, and extend the service life of key moving parts, especially suitable for precision manufacturing occasions with high frequency clamping, high coaxiality and high stability requirements. Attached Figure Description

[0024] Figure 1 This is a three-dimensional view of one type of internal support clamp in this solution.

[0025] Figure 2 This is a plan view of one type of internal support clamp in this solution.

[0026] Figure 3 yes Figure 2A three-dimensional diagram of AA.

[0027] Figure 4 yes Figure 1 A 3D view with parts of the structure hidden.

[0028] Figure 5 This is a 3D view of the support block in this design.

[0029] In the diagram, 100 is the base; 110 is the mounting groove; 200 is the support column; 210 is the threaded hole; 220 is the mounting part; 300 is the support block; 310 is the support surface; 320 is the connecting part; 400 is the drive assembly; 410 is the first push plate; 420 is the second push plate; 430 is the adjusting bolt; 440 is the elastic element; 500 is the hinge shaft; 600 is the connecting rod; and 700 is the washer. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0032] like Figures 1 to 5 As shown, this solution provides an internal support clamp for fixing a workpiece with an internal hole. The internal support clamp includes: a base 100 on which a support column 200 extending vertically is provided; a support block 300 hinged to the support column 200 and having a retracted state and an extended state; and a drive assembly 400 having a first push plate 410 and a second push plate 420 with lifting and lowering settings. The first push plate 410 and the second push plate 420 respectively movably abut against the two ends of the support block 300 in the vertical direction, for driving the support block 300 to switch between the retracted state and the extended state.

[0033] When the support block 300 is in the retracted state, its outer edge is close to the center line of the support column 200;

[0034] When the support block 300 is in the open state, its outer edge is away from the center line of the support column 200 and abuts against the inner wall of the inner hole of the workpiece, thereby fixing the workpiece.

[0035] During operation, the support block 300 is initially in a retracted state. At this time, the support block 300 retracts inward around its hinge point, minimizing its overall outer diameter and ensuring that its outer edge is as close as possible to the center line of the support column 200, thus reserving sufficient space for the smooth insertion of the workpiece. The operator or automated feeding mechanism aligns the workpiece to be processed with its inner hole aligned with the center of the inner support fixture in this solution, and places it on the outside of the support block 300 from top to bottom, completing the initial positioning.

[0036] Subsequently, the drive assembly 400 actuates, and the first push plate 410 moves smoothly downward in the vertical direction. After the first push plate 410 contacts the upper end of the support block 300, it applies a downward force to it; since the support block 300 is hinged to the support column 200, this torque causes the support block 300 to swing outward around the hinge point, and its outer edge gradually moves away from the center line and expands outward.

[0037] Simultaneously, the second push plate 420 adjusts its position downwards to provide stable support to the lower end of the support block 300. This continues until the support block 300 is pressed against the inner wall of the workpiece's inner hole. At this point, the support block 300 is in an open state, and the workpiece is fixed. Through the movement of the support block 300, uniform and symmetrical expansion and tightening of the workpiece's inner hole wall are achieved, forming a highly rigid, gapless internal support clamping state, thereby reliably fixing the workpiece and completing the clamping preparation.

[0038] In subsequent turning, milling, grinding, or inspection processes, the workpiece is firmly constrained with the inner hole as the reference, effectively avoiding problems such as thin-wall deformation, ellipticization, or local stress concentration caused by external clamping, and significantly improving machining accuracy and surface quality.

[0039] After processing is completed, the first push plate 410 disengages from the upper end of the support block 300, releasing the outward driving force on the support block 300; at the same time, the second push plate 420 moves upward, applying an upward thrust to the lower end of the support block 300, causing the support block 300 to rotate naturally around the hinge point and retract back to the contracted state.

[0040] At this point, the outer edge of the support block 300 approaches the center line again, disengages from the inner wall of the workpiece, releases the clamping force, and the workpiece can be easily removed or automatically unloaded by the robot arm. The whole process is efficient, stable, and impact-free.

[0041] The collaborative control mechanism of the first push plate 410 and the second push plate 420 not only achieves precise control of clamping and releasing actions, but also greatly improves the response speed and repeatability of the fixture. It is particularly suitable for the fast and flexible clamping requirements of thin-walled sleeves, flanges, gear hubs and other internal hole reference workpieces in high-cycle automated production lines.

[0042] The internal support clamping method applies clamping force from the inner hole of the workpiece, avoiding direct action on the outer surface, and is especially suitable for thin-walled, easily deformable workpieces or workpieces whose outer surface has not been finished.

[0043] During the clamping process, the workpiece is less likely to undergo radial deformation or ellipticization, effectively ensuring the dimensional accuracy and geometric tolerances of subsequent machining; at the same time, because the clamping force is evenly distributed through the inner hole, it avoids the clamping force imbalance caused by uneven casting / forging allowance on the outer surface, significantly improving clamping stability.

[0044] Furthermore, this method uses the inner hole as the positioning reference, which unifies the design reference and the process reference, preventing indentations or scratches on the workpiece surface and meeting the stringent requirements for repeatability and surface integrity in high-precision manufacturing applications.

[0045] Furthermore, the support block 300 has a support surface 310 that is adapted to the inner hole contour of the workpiece. The support surface 310 extends along the height direction of the support column 200. When the support block 300 is in the open state, the support surface 310 fits tightly against the inner wall of the inner hole of the workpiece to achieve uniform clamping.

[0046] The support surface 310 is designed so that the contact area between the support block 300 and the inner hole of the workpiece is distributed along the axial direction of the inner hole of the workpiece, which significantly increases the effective support area.

[0047] On the one hand, it can avoid local stress concentration and prevent thin-walled workpieces from deforming or being damaged during clamping; on the other hand, it improves the stability and coaxiality of clamping, and is especially suitable for high-precision turning, grinding or inspection of internal holes.

[0048] In order to achieve the hinge connection between the support block 300 and the support column 200, the support block 300 is provided with a connecting part 320 on the side near the support column 200; a connecting rod 600 is rotatably provided on the connecting part 320, and a hinge shaft 500 is installed on the support column 200. The end of the connecting rod 600 away from the connecting part 320 is rotatably connected to the hinge shaft 500, thereby hinged the support block 300 to the support column 200 in a swingable manner.

[0049] When the support block 300 swings relative to the support column 200, the connecting rod 600 rotates accordingly relative to the hinge shaft 500 and the connecting part 320 to adapt to the posture change of the support block 300.

[0050] This hinge structure provides the support block 300 with a stable degree of freedom of swing through the rotational engagement between the connecting rod 600, the hinge shaft 500, and the connecting part 320, enabling it to smoothly switch between the contracted and extended states.

[0051] This structure not only avoids jamming or stress concentration caused by rigid connections, but also effectively transmits driving force and maintains the controllability of the support block 300's movement trajectory. Simultaneously, the double rotary joint design compensates for manufacturing and assembly errors, improving the fixture's reliability and service life, making it particularly suitable for machining applications requiring high clamping accuracy and repeatability.

[0052] Furthermore, the support column 200 is symmetrically provided with support blocks 300 on its opposite sides, and the two support blocks 300 apply symmetrical clamping forces to the inner wall of the inner hole of the workpiece from the radial direction when the workpiece is in the open state.

[0053] The symmetrically arranged two support blocks (300) structure can apply a balanced clamping force radially from the inner hole of the workpiece, effectively achieving self-centering positioning and preventing the workpiece from becoming eccentric or tilted during clamping. This design significantly improves clamping stability and repeatability, making it particularly suitable for turning, grinding, or inspection processes where coaxiality is critical. Simultaneously, symmetrical force application reduces deformation of thin-walled workpieces caused by localized stress concentration, improving machining quality and yield.

[0054] Furthermore, the drive assembly 400 also includes an adjusting bolt 430. The first push plate 410 is provided with a through hole, and the end of the support column 200 is provided with a threaded hole 210. One end of the adjusting bolt 430 passes through the through hole and is screwed into the threaded hole 210. By turning the adjusting bolt 430 to change its screwing depth, the first push plate 410 is pushed to move in the vertical direction.

[0055] Furthermore, the drive assembly 400 also includes an elastic element 440, one end of which abuts against the base 100 and the other end against the second push plate 420. When the support block 300 changes from a contracted state to an open state, the elastic element 440 is compressed and undergoes elastic deformation. The elastic element 440 is preferably a spring.

[0056] During operation, the support blocks 300 are initially in a retracted state, meaning the support blocks 300 on both sides of the support column 200 are pulled inwards, with their outer edges close to the central axis of the support column 200, resulting in the smallest overall outer diameter, facilitating the smooth insertion of the workpiece. The operator places the workpiece with an inner hole onto the outer periphery of the inner support fixture in this design from top to bottom, ensuring that the inner hole of the workpiece coaxially surrounds the support column 200 and the support blocks 300.

[0057] Subsequently, the adjusting bolt 430 is screwed into the threaded hole 210 at the top of the support column 200. As the adjusting bolt 430 is gradually screwed in, its end continuously pushes the first push plate 410 downward, forcing the first push plate 410 to move smoothly downward in the vertical direction. The downward movement of the first push plate 410 directly acts on the upper region of the support block 300, applying a downward driving force to it. At the same time, the support block 300 swings outward around its hinge point due to the pressure on its upper end. During this swinging process, the lower end of the support block 300 moves downward and slightly outward, thereby pushing the second push plate 420 in contact with it to move downward in the vertical direction in sync.

[0058] As the support block 300 swings, the connecting rod 600, acting as an intermediate connecting member, rotates relative to the hinge shaft 500 fixed on the support column 200 and the connecting part 320 on the support block 300, respectively. This adapts to changes in the posture of the support block 300, ensuring uninterrupted and smooth movement. The support surface 310 on the support block 300 gradually moves away from the centerline of the support column 200, expanding outwards. During this clamping stroke, the second push plate 420 continuously compresses the elastic element 440 located between itself and the base 100. The elastic element 440 undergoes elastic deformation after compression, storing elastic potential energy and providing a certain reaction force, keeping the entire drive system in a pre-tensioned state and preventing loosening or vibration due to gaps.

[0059] When the support surface 310 is fully in contact with the inner wall of the workpiece's inner hole and sufficient clamping force is applied, the workpiece is firmly and stably positioned on the fixture. At this time, the threaded connection between the adjusting bolt 430 and the support column 200 is in a locked state, which can effectively maintain the clamping force and prevent clamping failure due to cutting force or vibration during the machining process.

[0060] After the workpiece has undergone turning, grinding, drilling, or other machining processes, the operator loosens the adjusting bolt 430 in the reverse direction, gradually disengaging it from the threaded hole 210 of the support column 200. As the downward pressure of the adjusting bolt 430 on the first push plate 410 is released, the previously compressed elastic element 440 begins to return to its original shape, releasing its stored elastic potential energy and generating an upward restoring thrust, which in turn pushes the second push plate 420 upward. The second push plate 420 then slides upward and pushes the lower end of the support block 300 upward in the reverse direction. Under the linkage of the connecting rod 600, the support block 300 swings in the opposite direction around the hinge axis 500, and its supporting surface 310 gradually moves closer to the center line of the support column 200. The overall structure smoothly transitions from the expanded state to the contracted state. At this time, the contact pressure between the support block 300 and the inner wall of the workpiece's inner hole disappears, the workpiece is no longer radially constrained, and the operator can easily remove it from the fixture, completing a complete clamping, machining, and unloading cycle.

[0061] The aforementioned drive and reset mechanism has a simple structure and reliable operation. It does not require an external power source and can achieve automatic reset simply by manually adjusting the bolt 430 in conjunction with the elastic element 440, which significantly improves operating efficiency and safety. It is especially suitable for flexible clamping scenarios of small to medium batch, high-precision internal hole parts.

[0062] Furthermore, a washer 700 is provided between the first push plate 410 and the top of the support column 200. The adjusting bolt 430 passes through the through hole of the first push plate 410 from top to bottom, and its rod passes through the center hole of the washer 700, pressing the washer 700 between the end face of the first push plate 410 and the support column 200. The end of the adjusting bolt 430 is screwed into the threaded hole 210 provided in the support column 200.

[0063] The washer 700 effectively increases the effective bearing area between the adjusting bolt 430 and the end face of the support column 200, preventing localized plastic deformation or surface wear of the end of the support column 200 caused by repeated clamping and loosening of the first push plate 410. Simultaneously, the washer 700 compensates for minor flatness errors or surface roughness differences between the bottom surface of the first push plate 410 and the top surface of the support column 200, resulting in a more uniform clamping force distribution and improved rigidity and repeatability of the clamping system. Furthermore, the washer 700 reduces direct metal-to-metal contact, lowers wear on the friction pair, and to some extent suppresses the tendency of bolts to loosen due to machining vibration, thereby improving the reliability and service life of the fixture.

[0064] Furthermore, the end of the support column 200 away from the first push plate 410 has a cylindrical mounting part 220, which is connected to the base 100. The second push plate 420 and the elastic member 440 are both sleeved on the mounting part 220.

[0065] Furthermore, the second push plate 420 is provided with a through hole extending along its axial direction, and the second push plate 420 is axially slidably sleeved on the mounting part 220 through the through hole.

[0066] When the second push plate 420 moves axially along the mounting portion 220 during clamping or resetting, the mounting portion 220, with its highly coaxial cylindrical outer surface, forms a precise sliding fit with the inner wall of the through hole of the second push plate 420, providing stable and reliable axial guidance for the second push plate 420. This guide structure effectively constrains the radial degree of freedom of the second push plate 420 during movement, preventing it from shaking, tilting, or jamming due to uneven force, assembly gaps, or external vibrations.

[0067] This not only ensures the high consistency of the movement trajectory of the second push plate 420 when compressing the elastic element 440 or transmitting the restoring force, but also guarantees the repeatability of the swing angle of the support block 300, thereby improving the positioning stability and clamping reliability of the entire fixture for the workpiece. In addition, the surface contact design between the cylindrical mounting part 220 and the through hole can evenly distribute contact stress, reduce local wear, and extend the service life of key moving parts, making it particularly suitable for precision machining applications requiring high-frequency clamping and high coaxiality.

[0068] Furthermore, the end of the elastic element 440 away from the second push plate 420 is accommodated in the mounting groove 110 on the base 100 and abuts against the bottom of the groove to achieve axial positioning.

[0069] The cylindrical mounting portion 220 provides circumferential constraint on the elastic element 440, while the mounting groove 110 provides a defined axial reference for the bottom end of the elastic element 440. Together, they effectively suppress radial displacement or lateral buckling of the elastic element 440 during compression or rebound, ensuring that its deformation always occurs axially. Simultaneously, the bottom of the groove serves as a stable force-bearing reference surface, avoiding stress concentration or preload fluctuations caused by uneven contact surfaces, significantly improving the repeatability and long-term reliability of the fixture.

[0070] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0071] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0072] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An internal support clamp for fixing a workpiece with an internal hole, characterized in that, The internal support clamp includes: A base on which support columns extending vertically are provided; A support block, which is hinged to the support column, and has a retracted state and an extended state; The driving assembly has a first push plate and a second push plate with lifting and lowering settings. The first push plate and the second push plate respectively move and abut against the two ends of the support block in the vertical direction, and are used to drive the support block to switch between the retracted state and the extended state. When the support block is in the retracted state, its outer edge is close to the center line of the support column; When the support block is in the extended state, its outer edge is away from the center line of the support column and abuts against the inner wall of the inner hole of the workpiece.

2. The internal support clamp as described in claim 1, characterized in that, The support block has a support surface extending along the height direction of the support column, and the support block abuts against the inner wall of the inner hole of the workpiece through the support surface.

3. The internal support clamp as described in claim 1, characterized in that, The support block has a connecting part on the side near the support column, and a connecting rod is rotatably provided on the connecting part. The support column is provided with a hinge shaft, and the end of the connecting rod opposite to the connecting part is rotatably connected to the hinge shaft for the support block to be hinged to the support column.

4. The internal support clamp as described in claim 1, characterized in that, The support column is symmetrically provided with support blocks on its opposite sides, and the two support blocks respectively abut against the inner wall of the inner hole of the workpiece.

5. The internal support clamp as described in claim 1, characterized in that, The drive assembly also includes an adjusting bolt. The first push plate has a through hole, and the end of the support column has a threaded hole. One end of the adjusting bolt passes through the through hole and is screwed into the threaded hole. By turning the adjusting bolt to change its screwing depth, the first push plate is pushed to move in the vertical direction.

6. The internal support clamp as described in claim 1, characterized in that, The drive assembly also includes an elastic element, one end of which abuts against the base and the other end against the second push plate. When the support block changes from the contracted state to the open state, the elastic element is compressed and undergoes elastic deformation.

7. The internal support clamp as described in claim 5, characterized in that, A washer is provided between the end of the first push plate and the end of the support column, and one end of the adjusting bolt passes through the through hole and the washer in sequence and is screwed into the threaded hole.

8. The internal support clamp as described in claim 6, characterized in that, The support column has a cylindrical mounting portion at the end away from the first push plate. The mounting portion is connected to the base, and both the second push plate and the elastic element are sleeved on the mounting portion.

9. The internal support clamp as described in claim 8, characterized in that, The second push plate is provided with a through hole extending along its axial direction, and the second push plate is axially slidably sleeved on the mounting part through the through hole.

10. The internal support clamp as described in claim 6, characterized in that, The base is provided with a mounting groove, and the end of the elastic member away from the second push plate is accommodated in the mounting groove and abuts against the bottom of the groove, which is used to provide positioning for the elastic member.

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