An inner supporting type clamp for thin-walled pipe machining

Abstract

This invention discloses an internal support fixture for processing thin-walled pipes. The invention relates to the field of pipe processing fixtures and includes a processing table with symmetrically slidably mounted fixing plates. A support seat for supporting the pipe is slidably mounted through the center of the upper surface of the processing table. This internal support fixture for processing thin-walled pipes employs a multi-point synchronous internal support structure with positioning mechanisms at both ends. Arc-shaped positioning blocks, combined with rubber pads, evenly adhere to the inner wall of the pipe, dispersing the tensioning stress and preventing localized pressure collapse of the thin-walled pipe. Before processing, the support seat automatically lifts and supports the middle section of the pipe, offsetting the deflection caused by the pipe's own weight, improving the pipe's rotational stability, and reducing processing vibration. During processing, the support seat automatically descends and separates from the pipe, relying solely on the internal support at both ends for fixation. This avoids the pressure damage and deformation problems caused by external clamping, significantly improving the forming quality and finished product qualification rate of thin-walled pipes.

Description

Technical Field

[0001] This invention relates to the field of pipe processing fixtures, specifically to an internal support type fixture for processing thin-walled pipes. Background Technology

[0002] Thin-walled tubes are widely used in hydraulic pipelines, precision instrument housings, aerospace fittings, heat exchange pipelines, and other fields. These tubes have thin walls and poor radial rigidity, making them highly susceptible to defects such as wall collapse, localized deformation, and machining vibrations during rotary machining processes such as turning, external grinding, cutting, and internal grooving. Currently, the mainstream clamping solutions in the industry are divided into two categories: external clamping fixtures and simple internal support fixtures. Both have significant shortcomings and are insufficient to meet the needs of high-precision batch processing of thin-walled tubes.

[0003] Traditional external clamping three-jaw chucks and clamping fixtures rely on compressing the outer wall of the tube to achieve locking and fixation, making clamping force control extremely difficult. If the clamping torque is too large, the thin-walled tube wall will be directly squeezed and dented, resulting in irreversible plastic deformation and causing the workpiece to be scrapped. If the clamping torque is too small, the tube is prone to circumferential slippage and axial displacement under the cutting force of the tool, and the roundness and dimensional tolerances after machining cannot meet the standards. At the same time, external clamping leaves indentations and clamping marks on the outer wall of the tube. For precision tubes with requirements for surface finish, an additional polishing and repair process is required, increasing processing time.

[0004] Existing conventional internal support fixtures on the market only use two-point or single-point radial support structures. When tightened, the inner wall of the pipe is subjected to concentrated force, and the local stress value is too large. Even with internal support, thin-walled pipes are still prone to bulging and denting deformation of the inner wall. Moreover, traditional internal support fixtures do not have a middle section auxiliary support structure. After long thin-walled pipes are clamped, only the two ends are subjected to force, and the middle section is completely suspended. The weight of the pipe itself will cause the pipe to bend significantly. When the machine tool rotates at high speed, the pipe will continuously vibrate at low frequency, which will not only increase the surface roughness of the workpiece, but also accelerate tool wear. In severe cases, safety hazards such as tool breakage and workpiece swing may occur.

[0005] Therefore, the present invention provides an internal support fixture for processing thin-walled tubes to solve the above-mentioned problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an internal support fixture for processing thin-walled tubes, solving the problems mentioned in the background section.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: an internal support fixture for processing thin-walled pipes, comprising a processing table, a fixed plate symmetrically and slidably arranged on the processing table, a support seat for supporting the pipe being slidably arranged through the center of the upper surface of the processing table, a fixed disk being rotatably embedded inside the fixed plate, and a positioning mechanism being provided on the fixed disk for extending into the inner walls of both ends of the pipe groove and supporting them.

[0008] The processing table is also equipped with a power mechanism that drives two fixed plates to move synchronously in the horizontal direction. When the power mechanism drives the fixed plates to move, the fixed plates drive the support base to move in the vertical direction through the transmission assembly.

[0009] Preferably, a limit frame is slidably disposed through the processing table, and the support base is fixedly disposed on the top of the limit frame.

[0010] Preferably, the positioning mechanism includes a positioning cylinder, which is fixedly disposed on one side of the fixed plate relative to the center of the processing table. Multiple guide rods are uniformly fixedly disposed on the outer surface of the end of the positioning cylinder away from the fixed plate. A positioning rod is slidably disposed inside the guide rod. A positioning block is fixedly disposed on the side of the positioning rod away from the positioning cylinder.

[0011] Preferably, a positioning screw is rotatably provided inside the positioning cylinder, a positioning ring is threadedly connected to the outer surface of the positioning screw, a plurality of positioning seats are uniformly fixedly provided on the outer surface of the positioning ring, the positioning seats penetrate the side wall of the positioning cylinder and slide along its inner surface, an extension rod is fixedly provided on the side of the positioning rod near the fixed plate, and a drive rod is rotatably connected between the extension rod and the positioning seat.

[0012] Preferably, a rotating motor is fixedly mounted on the fixed plate, and the output shaft of the rotating motor is fixedly connected to the end of the positioning screw through a coupling. The positioning block has an arc-shaped design and a rubber pad is fixedly mounted on its outer surface.

[0013] Preferably, the guide rod has a guide groove extending through it on one side opposite to the fixed plate, and the extension rod extends through the guide groove and is slidably disposed therewith;

[0014] A limiting groove is formed through the side wall of the positioning cylinder, and the positioning seat passes through the limiting groove and is slidably disposed with its inner wall.

[0015] Preferably, the power mechanism includes mounting frames symmetrically fixedly arranged on the processing table. The mounting frames are arranged along the length direction of the processing table. A drive screw is rotatably arranged inside the mounting frame. The ends of two drive screws pass through the mounting frame and are connected by belt drive. A drive block is threadedly connected to the outer surface of the drive screw. The side of the drive block away from the mounting frame is fixedly connected to a fixed plate. A drive motor is fixedly arranged outside one of the mounting frames. The output shaft of the drive motor is fixedly connected to the end of the drive screw inside the mounting frame through a coupling.

[0016] Preferably, the transmission assembly includes a transmission plate symmetrically slidably disposed at the bottom of the processing table. The transmission plate is fixedly disposed with one of the fixed plates by a connecting rod. The connecting rod passes through the processing table and is slidably disposed with its inner wall. The outer side of the limiting frame is symmetrically fixedly disposed with transmission protrusions. The transmission protrusions pass through the transmission plate and are slidably disposed with its inner surface.

[0017] Preferably, a transmission groove is formed through the transmission plate, wherein the transmission groove is composed of two transmission inclined grooves and a transmission transverse groove, the transmission transverse groove is disposed between the two transmission inclined grooves and the ends are connected to each other, and the inclination directions of the two transmission inclined grooves are opposite.

[0018] Beneficial effects

[0019] This invention provides an internal support clamp for processing thin-walled tubes. Compared with the prior art, it has the following advantages:

[0020] (1) The internal support clamp for thin-walled pipe processing adopts a multi-point synchronous internal support structure with positioning mechanisms at both ends. The arc-shaped positioning block and rubber pad are evenly attached to the inner wall of the pipe to disperse the tension and avoid local pressure collapse of the thin-walled pipe. Before processing, the support seat automatically lifts and supports the middle section of the pipe to offset the deflection caused by the weight of the pipe, improve the rotational stability of the pipe, and reduce processing vibration. During processing, the support seat automatically descends and separates from the pipe, relying only on the internal support of the inner walls at both ends for fixation, avoiding the crushing and deformation problems caused by the clamping of the outer wall, and significantly improving the processing quality and finished product qualification rate of thin-walled pipe.

[0021] (2) The internal support fixture for thin-walled pipe processing uses a single drive motor as the power source for the horizontal feed of the fixed plate. The transmission components are linked to realize the automatic lifting of the support seat. There is no need to add additional lifting drive components, which simplifies the overall machine drive and control system, reduces equipment manufacturing costs and synchronous debugging difficulty. The fixed plate horizontal feed stroke is controlled in segments to automatically complete the entire process of pipe lifting, pipe end alignment and support avoidance. There is no need for manual step-by-step operation, which simplifies the pipe loading and unloading process, shortens the single-piece clamping auxiliary time, and effectively improves the batch processing efficiency of thin-walled pipes. Attached Figure Description

[0022] Figure 1 A first-view schematic diagram of the external structure provided for this invention;

[0023] Figure 2 This is a second-view schematic diagram of the external structure provided by the present invention;

[0024] Figure 3 This is a schematic diagram of the positioning mechanism structure provided by the present invention;

[0025] Figure 4 This is a cross-sectional schematic diagram of the inner positioning cylinder provided by the present invention;

[0026] Figure 5 A schematic diagram of the power mechanism structure provided by the present invention;

[0027] Figure 6 This is a schematic diagram showing the connection between the fixing plate and the limiting frame provided by the present invention;

[0028] Figure 7 This is a schematic diagram of the transmission component structure provided by the present invention;

[0029] Figure 8 This is a schematic diagram of the transmission plate structure provided by the present invention.

[0030] In the diagram: 1-Processing table; 2-Fixed plate; 3-Support base; 301-Limiting frame; 4-Fixed disc; 5-Positioning mechanism; 501-Positioning cylinder; 502-Guide rod; 503-Positioning rod; 504-Positioning block; 505-Positioning screw; 506-Positioning ring; 507-Positioning seat; 508-Extension rod; 509-Drive rod; 5010-Rotating motor; 5011-Guide slide groove; 5012-Limiting slide groove; 6-Power mechanism; 601-Mounting frame; 602-Drive screw; 603-Drive block; 604-Drive motor; 7-Transmission assembly; 701-Transmission plate; 702-Transmission protrusion; 703-Transmission groove; 7031-Transmission inclined groove; 7032-Transmission transverse groove; 704-Connecting rod. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1-8This invention provides a technical solution: an internal support clamp for processing thin-walled pipes, including a processing table 1, on which a fixed plate 2 is symmetrically slidably arranged. A support seat 3 for supporting the pipe is slidably arranged through the center of the upper surface of the processing table 1. The support seat 3 has an arc-shaped lifting structure, and the arc-shaped contact surface is adapted to the outer circle of the circular pipe, increasing the contact area and making it less likely for the pipe to roll or deviate during the loading and lifting process; and an anti-slip soft pad is added to the surface to prevent indentations on the surface of the thin-walled pipe. A fixed disk 4 is rotatably embedded inside the fixed plate 2. The fixed disk 4 can be connected to an external machine tool spindle for synchronous rotation, adapting to rotary processing conditions such as pipe turning, outer circle grinding, and outer wall grooving; the fixed disk 4 is provided with a positioning mechanism 5 that extends into the inner walls of the pipe groove and supports them; the pipe is evenly supported from multiple points on the inner wall, replacing the traditional external clamping and avoiding the collapse of the thin-walled pipe wall under pressure. The processing table 1 is also equipped with a power mechanism 6 that drives two fixed plates 2 to move synchronously in the horizontal direction. When the power mechanism 6 drives the fixed plates 2 to move, the fixed plates 2 drive the support base 3 to move in the vertical direction through the transmission assembly 7.

[0033] A limit frame 301 is slidably installed on the processing table 1, and the limit frame 301 has a "U" shape design. The support base 3 is fixedly installed on the top of the limit frame 301. A vertical through slide is opened in the center of the table surface, and the limit frame 301 rises and falls vertically along the slide to ensure that the axis remains unchanged after the pipe is raised.

[0034] The positioning mechanism 5 includes a positioning cylinder 501, which is fixedly installed on one side of the fixed plate 4 relative to the center of the processing table 1. Multiple guide rods 502 are evenly fixedly installed on the outer surface of the end of the positioning cylinder 501 away from the fixed plate 2. A positioning rod 503 is slidably installed inside the guide rod 502. A positioning block 504 is fixedly installed on the side of the positioning rod 503 away from the positioning cylinder 501. The positioning block 504 is arc-shaped and a rubber pad is fixedly installed on its outer surface.

[0035] Multiple sets of 504 positioning blocks expand synchronously outward along the circumference, providing multi-point distributed support for the inner wall of the pipe. Compared with single-point / two-point support, this significantly reduces local stress and prevents the inner wall of thin-walled pipes from sinking or deforming. Furthermore, the arc shape matches the inner circle of the pipe, maximizing the contact area. The outer rubber pad increases the coefficient of friction, preventing the pipe from slipping during processing, while also buffering the clamping pressure and preventing hard metal blocks from scratching the inner wall of the pipe. It is suitable for stainless steel and aluminum thin-walled soft pipes.

[0036] A positioning screw 505 is rotatably mounted inside the positioning cylinder 501. A positioning ring 506 is threadedly connected to the outer surface of the positioning screw 505. Multiple positioning seats 507 are evenly fixed on the outer surface of the positioning ring 506. The positioning seats 507 penetrate the side wall of the positioning cylinder 501 and slide against its inner surface. The rotation of the positioning screw 505 drives the positioning ring 506 to move axially. The positioning ring 506 pulls multiple sets of positioning seats 507 to move outward synchronously, realizing the synchronous and equidistant expansion of all positioning blocks 504 around the circumference, with high centering accuracy. Moreover, the thread has a self-locking characteristic, and no additional locking mechanism is needed after the motor stops, continuously maintaining the tension force on the inner wall of the pipe, and the tension force will not decrease during processing. An extension rod 508 is fixedly mounted on the side of the positioning rod 503 near the fixed plate 4. A drive rod 509 is rotatably connected between the extension rod 508 and the positioning seat 507. The drive rod 509 converts the axial movement of the positioning seat 507 into the radial extension movement of the positioning rod 503, forming a linkage expansion mechanism. This amplifies the radial tension stroke, and a small amount of screw movement can achieve a large range of extension and retraction of the positioning block 504, adapting to various pipe diameters.

[0037] A rotary motor 5010 is fixedly mounted on the fixed plate 4. The output shaft of the rotary motor 5010 is fixedly connected to the end of the positioning screw 505 via a coupling. The rotary motor 5010 independently drives the positioning screw 505 on one side. The two motors can start and stop synchronously and rotate synchronously in both directions, accurately controlling the tightening and loosening of the workpiece. The speed is controllable, and the tightening speed can be finely adjusted to avoid instantaneous heavy pressure on the thin-walled tube.

[0038] A guide groove 5011 is provided through one side of the guide rod 502 relative to the fixed plate 4. The extension rod 508 passes through the guide groove 5011 and slides along its inner surface. The guide groove 5011 provides a linear sliding track for the positioning rod 503, ensuring that the positioning block 504 expands and contracts only along the radial direction of the pipe without deviation. Furthermore, the guide groove 5011 limits the sliding range of the extension rod 508, restricts the maximum expansion radius of the positioning block 504, adapts to thin-walled pipes with different inner diameters, and prevents over-stretching and cracking of the pipe wall.

[0039] A limiting groove 5012 is formed through the side wall of the positioning cylinder 501, and the positioning seat 507 passes through the limiting groove 5012 and is slidably disposed with its inner wall. The limiting groove 5012 restricts the positioning seat 507 to extend and retract only in the radial direction, preventing the positioning seat 507 from twisting or jamming when the positioning ring 506 rotates.

[0040] The power mechanism 6 includes a mounting frame 601 symmetrically fixed on the processing table 1. The mounting frame 601 has an opening on one side relative to the fixed plate 2. The mounting frame 601 is positioned along the length of the processing table 1. A drive screw 602 is rotatably mounted inside the mounting frame 601. Two threads are symmetrically arranged on the outer surface of the drive screw 602, with the same pitch but opposite directions, thus driving the drive block 603 to move synchronously, maintaining the same movement distance. The ends of the two drive screws 602 pass through the mounting frame 601 and are connected by a belt drive. The drive block 603 is threadedly connected to the outer surface of the drive screw 602. The outer surface of the drive block 603 slides against the inner surface of the mounting frame 601, ensuring the stability of the fixed plate 2 during movement. The side of the drive block 603 furthest from the mounting frame 601 is fixedly connected to the fixed plate 2. The screw thread drive offers advantages such as high feed accuracy and strong self-locking capability, ensuring impact-free feeding of the fixed plate 2 and preventing deformation of the pipe opening when the positioning cylinder 501 is inserted. Two drive screws 602 are synchronously driven by a belt. A pulley is fixedly mounted on the outer surface of the end of each drive screw 602, and the belt is fitted between the outer surfaces of the two pulleys. A single motor can drive the two fixed plates 2 to move synchronously in opposite directions, ensuring that the feeding stroke of the positioning cylinders 501 on both sides is completely consistent, and the pipe is automatically centered. A drive motor 604 is fixedly mounted on the outside of one of the mounting frames 601. The output shaft of the drive motor 604 is fixedly connected to the end of the drive screw 602 inside the mounting frame 601 via a coupling. Forward rotation of the drive motor 604 controls the opposite feeding of the fixed plates 2, pipe lifting, and insertion of the positioning cylinders 501; reverse rotation controls the separation of the fixed plates 2, the fall of the support base 3, and material release. The single motor simplifies the overall control system and reduces the cost of multi-motor synchronous control.

[0041] The transmission assembly 7 includes transmission plates 701 symmetrically slidably disposed at the bottom of the processing table 1. A connecting plate is fixedly disposed between the two transmission plates 701 to ensure consistency in the movement of the two transmission plates 701. The transmission plates 701 are fixedly disposed to one of the fixed plates 2 by a connecting rod 704. The connecting rod 704 passes through the processing table 1 and is slidably disposed with its inner wall. A sliding groove is provided through the processing table 1. The connecting rod 704 passes through the sliding groove and is slidably disposed with its outer surface, thereby providing space for the connecting rod 704 to move. Transmission protrusions 702 are symmetrically fixedly disposed on the outer side of the limiting frame 301. The transmission protrusions 702 pass through the transmission plates 701 and are slidably disposed with their inner surfaces. The transmission protrusions 702 bear the horizontal component of the transmission inclined groove 7031, converting the lateral thrust into a vertical lifting force, and synchronously driving the support base 3 to lift and lower as a whole. The transmission protrusions 702 on both sides are subjected to balanced forces, and the lifting and lowering are smooth and do not tilt.

[0042] A T-shaped block is fixedly installed on the top of the transmission plate 701, and a T-shaped groove is opened on the bottom of the processing table 1, wherein the T-shaped block can be slidably installed inside the T-shaped groove.

[0043] A transmission groove 703 is formed through the transmission plate 701, and a transmission protrusion 702 passes through the transmission groove 703 and is fitted against its inner wall. The transmission groove 703 consists of two inclined transmission grooves 7031 and a transverse transmission groove 7032. The transverse transmission groove 7032 is positioned between the two inclined transmission grooves 7031 and their ends are interconnected. The two inclined transmission grooves 7031 are inclined in opposite directions. The power mechanism 6 drives the fixed plate 2 to move horizontally inward. The fixed plate 2 pulls the transmission plate 701 to slide horizontally synchronously via the connecting rod 704. The side wall of the inclined transmission groove 7031 on the transmission plate 701 presses against the transmission protrusion 702 on the outer side of the limiting frame 301, converting the horizontal thrust into a vertical upward lifting force, pushing the limiting frame 301 and the support base 3 to rise synchronously. The arc-shaped groove of the support base 3 fits against the bottom of the pipe, lifting the pipe to a reference height and preventing the pipe from falling off-center due to its own weight. As the fixed plate 2 continues to move inward until the tube axis is fully aligned with the rotation center of the fixed plate 4, the transmission protrusion 702 slides into the transmission transverse groove 7032 in the middle of the transmission plate 701. The transmission transverse groove 7032 is a horizontal straight groove with no vertical force output. The height of the limit frame 301 and the support seat 3 remains constant, continuously supporting the tube and ensuring that the positioning cylinders 501 of the positioning mechanisms 5 on both sides are accurately aligned with the tube ends, avoiding tube end collisions and positioning deviations. The fixed plate 2 continues to feed inward slightly, and the positioning cylinders 501 are fully inserted into the inside of both ends of the tube. At this time, the transmission protrusion 702 slides into the reverse inclined transmission groove 7031 on the other side. The inclined surface of the groove pulls the transmission protrusion 702 downward, simultaneously driving the limit frame 301 and the support seat 3 to descend as a whole. The support seat 3 separates from the bottom of the tube, and the tube is completely suspended, eliminating the interference of the bottom support on the turning and external grinding tools. Fixing is completed solely by the internal support of the inner walls at both ends.

[0044] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0045] During operation, the drive motor 604 rotates in reverse, the drive screw 602 drives the two fixed plates 2 to separate to the sides to the maximum stroke, the transmission plate 701 moves outward synchronously, the transmission sloping groove 7031 pulls the transmission protrusion 702 downward, the limit frame 301 drives the support seat 3 to the low position, and the thin-walled tube is placed on the support seat 3 manually.

[0046] The drive motor 604 starts in the forward direction, the two drive screws 602 rotate synchronously, the drive block 603 drives the fixed plate 2 to feed in opposite directions; the connecting rod 704 pulls the transmission plate 701 to slide inward, the front transmission inclined groove 7031 pushes the transmission protrusion 702, the support seat 3 lifts and supports the pipe, and lifts the pipe to the same height as the fixed plate 4.

[0047] As the fixed plate 2 continues to feed, the transmission protrusion 702 slides into the transmission transverse groove 7032, the height of the support seat 3 remains unchanged, and the positioning cylinders 501 on both sides are smoothly inserted into the pipe ends to complete the pipe end alignment.

[0048] The fixing plate 2 is slightly advanced, the positioning cylinder 501 is fully inserted into the pipe, the transmission protrusion 702 slides into the reverse transmission groove 7031, the limit frame 301 drives the support seat 3 to descend and separate from the bottom of the pipe.

[0049] The two rotating motors 5010 synchronously drive the positioning screw 505 to rotate, the positioning ring 506 drives the positioning seat 507 and the drive rod 509 to expand, and the positioning block 504 evenly supports the inner wall of the pipe at multiple points; the machine tool spindle drives the fixed plate 4 and the positioning mechanism 5 to rotate synchronously with the pipe to carry out turning, grinding and cutting processing.

[0050] After processing, the rotating motor 5010 reverses, the positioning block 504 retracts and releases the workpiece; the drive motor 604 reverses, the fixing plate 2 separates to both sides, the support seat 3 first briefly lifts to receive the pipe, and then continues to descend, the finished pipe is manually removed, the fixture is reset and waits for the next loading.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 process, method, article, or apparatus.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An internal support type clamp for processing thin-walled pipes, comprising a processing table (1), wherein fixed plates (2) are symmetrically slidably arranged on the processing table (1), characterized in that: A support seat (3) for supporting the pipe is slidably provided through the center of the upper surface of the processing table (1). A fixed plate (4) is rotatably embedded in the inside of the fixed plate (2). A positioning mechanism (5) is provided on the fixed plate (4) to extend into the inside of both ends of the pipe groove and support its inner wall. The processing table (1) is also provided with a power mechanism (6) that drives two fixed plates (2) to move synchronously in the horizontal direction. When the power mechanism (6) drives the fixed plates (2) to move, the fixed plates (2) drive the support base (3) to move in the vertical direction through the transmission assembly (7).

2. The internal support clamp for processing thin-walled tubes according to claim 1, characterized in that: A limit frame (301) is slidably mounted on the processing table (1), and the support base (3) is fixedly mounted on the top of the limit frame (301).

3. The internal support clamp for processing thin-walled tubes according to claim 1, characterized in that: The positioning mechanism (5) includes a positioning cylinder (501), which is fixedly disposed on one side of the fixed plate (4) relative to the center of the processing table (1). Multiple guide rods (502) are uniformly fixedly disposed on the outer surface of the end of the positioning cylinder (501) away from the fixed plate (2). A positioning rod (503) is slidably disposed inside the guide rod (502). A positioning block (504) is fixedly disposed on the side of the positioning rod (503) away from the positioning cylinder (501).

4. The internal support clamp for processing thin-walled tubes according to claim 3, characterized in that: The positioning cylinder (501) is rotatably provided with a positioning screw (505), and a positioning ring (506) is threadedly connected to the outer surface of the positioning screw (505). Multiple positioning seats (507) are uniformly fixed on the outer surface of the positioning ring (506). The positioning seats (507) penetrate the side wall of the positioning cylinder (501) and slide on its inner surface. An extension rod (508) is fixedly provided on the side of the positioning rod (503) near the fixed plate (4). A drive rod (509) is rotatably connected between the extension rod (508) and the positioning seat (507).

5. The internal support clamp for processing thin-walled tubes according to claim 4, characterized in that: A rotating motor (5010) is fixedly installed on the fixed plate (4). The output shaft of the rotating motor (5010) is fixedly connected to the end of the positioning screw (505) through a coupling. The positioning block (504) is arc-shaped and has a rubber pad fixedly installed on its outer surface.

6. The internal support clamp for processing thin-walled tubes according to claim 5, characterized in that: The guide rod (502) has a guide groove (5011) through it on one side of the fixed plate (4), and the extension rod (508) passes through the guide groove (5011) and is slidably disposed therewith. A limiting groove (5012) is provided through the side wall of the positioning cylinder (501), and the positioning seat (507) passes through the limiting groove (5012) and is slidably disposed with its inner wall.

7. The internal support type clamp for processing thin-walled tubes according to claim 1, characterized in that: The power mechanism (6) includes a mounting frame (601) symmetrically fixed on the processing table (1). The mounting frame (601) is arranged along the length direction of the processing table (1). A drive screw (602) is rotatably arranged inside the mounting frame (601). The ends of the two drive screws (602) pass through the mounting frame (601) and are connected by belt drive. A drive block (603) is threadedly connected to the outer surface of the drive screw (602). The side of the drive block (603) away from the mounting frame (601) is fixedly connected to the fixing plate (2). A drive motor (604) is fixedly arranged outside one of the mounting frames (601). The output shaft of the drive motor (604) is fixedly connected to the end of the drive screw (602) inside the mounting frame (601) through a coupling.

8. The internal support clamp for processing thin-walled tubes according to claim 2, characterized in that: The transmission assembly (7) includes a transmission plate (701) symmetrically slidably disposed at the bottom of the processing table (1). The transmission plate (701) is fixedly disposed with one of the fixed plates (2) by a connecting rod (704). The connecting rod (704) passes through the processing table (1) and is slidably disposed with its inner wall. The outer side of the limiting frame (301) is symmetrically fixedly disposed with a transmission protrusion (702). The transmission protrusion (702) passes through the transmission plate (701) and is slidably disposed with its inner surface.

9. The internal support type clamp for processing thin-walled tubes according to claim 8, characterized in that: The transmission plate (701) has a through-hole transmission groove (703), wherein the transmission groove (703) is composed of two transmission inclined grooves (7031) and a transmission transverse groove (7032). The transmission transverse groove (7032) is disposed between the two transmission inclined grooves (7031) and its ends are connected to each other. The two transmission inclined grooves (7031) are inclined in opposite directions.

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