Self-adaptive synchronous clamping and expanding equipment for thin-walled tube
The integrated design of the adaptive synchronous clamping device solves the problem of uneven clamping of thin-walled tubes, achieving uniform clamping and efficient tube expansion, thereby improving production efficiency and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHEJIANG AOSEN MASCH CO LTD
- Filing Date
- 2026-02-10
- Publication Date
- 2026-05-12
AI Technical Summary
Traditional tube expansion equipment can cause uneven stress on thin-walled tubes, resulting in localized indentations and ellipticization, which affects connection reliability and product lifespan. It also increases the number of operation steps and labor intensity, and reduces production efficiency.
The tube expansion device adopts adaptive synchronous clamping. Through the cooperation of the outer clamping ring, inner clamping ring and outer abutment ring, inner abutment ring, it can achieve uniform clamping of thin-walled tubes. Under the push of the hydraulic cylinder, the clamping and tube expansion actions are completed synchronously. The integrated design reduces the number of operation steps.
It achieves uniform clamping of thin-walled tubes, avoids deformation, improves work efficiency, simplifies operation procedures, and reduces costs.
Smart Images
Figure CN122007262A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of tube expansion technology, specifically to a thin-walled tube adaptive synchronous clamping and expansion device. Background Technology
[0002] The tube expansion process is a key step in the manufacturing and maintenance of pressure vessels such as heat exchangers and boilers. It achieves a tight mechanical connection and seal between the tubes and the tube sheet by expanding the tube openings inside the tube sheet holes.
[0003] Firstly, regarding clamping and positioning, traditional tube expanders or tooling typically use a single external clamp or fixture to fix the tube. For thin-walled tubes (especially thin-walled copper tubes), this unidirectional external clamping easily leads to uneven radial stress on the tube wall, causing localized depressions, ellipticization, or even irreversible plastic deformation. This pre-deformation caused by the clamping itself not only affects the product's appearance quality but also disrupts the material's uniformity. During subsequent tube expansion, this can lead to stress concentration, uneven expansion, or seal failure, severely reducing the reliability of the connection and the product's lifespan.
[0004] Secondly, regarding process flow and efficiency, a common practice is to first use an external fixture (which may be a separate vise, chuck, or special tooling) to firmly clamp the workpiece before starting the tube expander for the expansion operation. This adds extra steps and equipment configuration, slowing down the production pace and reducing work efficiency. Furthermore, it requires the operator to perform two setup and positioning adjustments, which not only increases labor intensity but may also introduce cumulative errors due to repeated positioning, affecting the consistency of tube expansion accuracy. Summary of the Invention
[0005] To address the aforementioned problems in the existing technology, this invention provides a thin-walled tube adaptive synchronous clamping expansion device, which has the advantages of flexible clamping and rapid clamping.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a worktable is included, wherein a mounting plate and a feed plate are provided inside the worktable, wherein the mounting plate is fixedly installed inside the worktable, the feed plate is movably installed inside the worktable, a limit structure is provided on the mounting plate, and at least two expansion components and a power component are provided on the feed plate, the power component being connected to the expansion components; The expansion assembly includes an expansion tube outer shell, an expansion tube inner shaft, a propulsion outer cylinder, a propulsion inclined shaft, and an expansion tube head. The expansion tube inner shaft is located at the center of the expansion tube outer shell. The expansion tube outer shell and the expansion tube inner shaft are fixedly installed together by a connecting slider. An outer clamping ring and an inner clamping ring are respectively fixed to the ends of the expansion tube outer shell and the expansion tube inner shaft. The propulsion inclined shaft is fitted onto the expansion tube inner shaft. The propulsion outer cylinder is located on the inner wall of the expansion tube outer shell. An outer abutment ring and an inner abutment ring are slidably arranged inside both. The inner abutment ring cooperates with the inner clamping ring, and the outer abutment ring cooperates with the outer clamping ring to provide the inner and outer clamping function of the thin tube.
[0007] Preferably, the connecting slider on the inner shaft of the expansion tube extends to the outside of the expansion tube outer shell, is fixedly mounted on the feed plate by a fixing plate, and moves together with the feed plate. The inner wall of the expansion tube outer shell is fixedly connected to the expansion tube head by at least two connecting rods, and the outer cylinder of the propulsion is provided with a through outer cylinder groove.
[0008] Preferably, the connecting rod on the expansion head slides within the outer cylinder groove, and a plurality of expansion blocks are provided inside the expansion head, which are evenly distributed circumferentially and slide within the expansion head.
[0009] Preferably, the outer propulsion cylinder is located on the outer periphery of the propulsion inclined shaft and is slidably connected to the inner wall of the expansion tube shell. The propulsion inclined shaft is slidably mounted on the inner shaft of the expansion tube. Both the outer propulsion cylinder and the propulsion inclined shaft are fixedly mounted on the propulsion rod and move synchronously with the propulsion rod.
[0010] Preferably, the sidewall of the outer abutment ring is fixedly installed on the inner wall of the outer propulsion cylinder by an outer abutment spring, and the end of the outer abutment ring near the outer clamping ring is inclined inward to compress the outer clamping ring to expand inward; The side wall of the inner abutment ring is fixedly installed on the inner wall of the propulsion inclined shaft by an inner abutment spring. The end face of the inner abutment ring near the inner clamping ring is inclined outward, squeezing the inner clamping ring to expand outward.
[0011] Preferably, the power assembly includes a hydraulic cylinder fixed to the feed plate, and a push rod mounted on the telescopic rod of the hydraulic cylinder. At least two push rods are provided, corresponding to the expansion assembly, and one end of the push rod is fixed to the expansion assembly.
[0012] Preferably, the push rod has a notch, which corresponds to the connecting slider, so that the notch and the connecting slider slide relative to each other.
[0013] Preferably, the mounting plate is fixed to the bottom of the worktable and corresponds to the feed plate. The mounting plate is provided with a placement groove, and at least two limiting pins are provided in the groove for placing the workpiece.
[0014] Preferably, the worktable is further provided with a slide rail groove, and a feed threaded block is fixed at the bottom of the feed plate. The feed threaded block slides in the slide rail groove. A feed screw is also rotatably installed inside the worktable. The feed screw passes through the feed threaded block and is threadedly engaged with the feed threaded block. The other end of the feed screw extends to the outside.
[0015] Preferably, one side of the hydraulic cylinder is connected to an external oil tank via a hose, and an external motor is installed on the external part of the feed screw. Both the hydraulic cylinder and the motor are controlled by a control system for feeding.
[0016] Compared with the prior art, the present invention provides a thin-walled tube adaptive synchronous clamping and expansion device, which has the following beneficial effects: 1. This thin-walled tube adaptive synchronous clamping and expansion device effectively solves the problem of easy deformation when clamping thin-walled tube workpieces by using the outer clamping ring, inner clamping ring, outer abutment ring, and inner abutment ring in the expansion assembly. Specifically, the outer clamping ring and inner clamping ring apply clamping force simultaneously from the outer and inner walls of the copper tube, respectively, so that the clamping force is evenly distributed on the circumference of the copper tube. The clamping forces of the inner and outer walls cancel each other out, thus clamping the workpiece and preventing it from being deformed.
[0017] 2. This thin-walled tube adaptive synchronous clamping and expanding device, through the integrated design of the expansion component and the clamping component, can simultaneously complete the clamping action of the outer clamping ring and the inner clamping ring and the expanding action of the expanding block when the hydraulic cylinder pushes the push rod to move. The switching between clamping and expanding does not require additional operation steps, which greatly improves its working efficiency and eliminates the need for external clamping devices, thus reducing costs. Attached Figure Description
[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the half-section structure of the present invention; Figure 3 This is a schematic diagram of the expansion component structure of the present invention; Figure 4 This is a schematic diagram of a half-section of the expansion component of the present invention; Figure 5 This is a schematic diagram of a half-section of the expansion component of the present invention; Figure 6 This is a schematic diagram of the outer cylinder structure of the present invention; Figure 7 This is a schematic diagram of the propulsion outer cylinder and inclined shaft half-section structure of the present invention; Figure 8 This is a half-sectional structural diagram of the expansion tube outer shell and inner shaft of the present invention.
[0019] In the diagram: 10. Worktable; 11. Feed screw; 20. Mounting plate; 21. Limit pin; 30. Feed plate; 301. Feed threaded block; 31. Hydraulic cylinder; 32. Push rod; 40. Expander tube housing; 401. Outer clamping ring; 41. Inner shaft of expander tube; 411. Inner clamping ring; 412. Connecting slider; 42. Pusher outer cylinder; 421. Outer abutment ring; 422. Outer abutment spring; 423. Outer cylinder groove; 43. Pusher inclined shaft; 431. Inner abutment ring; 432. Inner abutment spring; 44. Expander tube head. Detailed Implementation
[0020] 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.
[0021] like Figure 1-8 As shown, the system includes a worktable 10, within which a mounting plate 20 and a feed plate 30 are disposed. The mounting plate 20 is fixedly installed within the worktable 10, while the feed plate 30 is movably installed within the worktable 10. The mounting plate 20 has a limit structure, and the feed plate 30 has at least two expansion components and a power component, with the power component connected to the expansion components. The power component includes a hydraulic cylinder 31 fixed to the feed plate 30, and push rods 32 mounted on the telescopic rod of the hydraulic cylinder 31. At least two push rods 32 are provided, corresponding to the expansion components. One end of each push rod 32 is fixed to an expansion component, and a notch is provided within the push rod 32, corresponding to a connecting slider 412, allowing the notch to slide relative to the connecting slider 412. The worktable 10 is also provided with a slide rail groove. The bottom of the feed plate 30 is fixed with a feed thread block 301. The feed thread block 301 slides in the slide rail groove. The worktable 10 is also rotatably installed with a feed screw 11. The feed screw 11 passes through the feed thread block 301 and is threadedly engaged with the feed thread block 301. The other end of the feed screw 11 extends to the outside. One side of the hydraulic cylinder 31 is connected to the external oil tank through a hose. The external part of the feed screw 11 is equipped with a motor. The hydraulic cylinder 31 and the motor are both controlled by the control system for feeding.
[0022] The expansion assembly includes an expansion tube outer shell 40, an expansion tube inner shaft 41, a propulsion outer cylinder 42, a propulsion inclined shaft 43, and an expansion tube head 44. The expansion tube inner shaft 41 is located at the center of the expansion tube outer shell 40, and the two are fixedly installed together by a connecting slider 412. An outer clamping ring 401 and an inner clamping ring 411 are respectively fixed to the ends of the expansion tube outer shell 40 and the expansion tube inner shaft 41. The propulsion inclined shaft 43 is fitted onto the expansion tube inner shaft 41. The propulsion outer cylinder 42 is located on the inner wall of the expansion tube outer shell 40, and both have external abutments that slide inside them. The outer abutment ring 421 and the inner clamping ring 431, wherein the inner clamping ring 431 cooperates with the inner holding ring 411, and the outer clamping ring 421 cooperates with the outer holding ring 401, provide internal and external clamping function for the thin tube. Both the outer clamping ring 401 and the inner clamping ring 411 are movable, for example, both can be made of elastic rubber or resin. During clamping, the outer abutment ring 421 and the inner clamping ring 431 can deform and expand towards the center, thereby clamping the workpiece. Multiple clamps capable of inward rotation can also be provided. The clamping blocks, namely the outer clamping ring 401 and the inner clamping ring 411, are composed of several rotatable clamping blocks. Under the contact of the outer abutment ring 421 and the inner abutment ring 431, the clamping blocks will rotate inward or outward, thus abutting against the workpiece and completing the internal and external clamping. In the expansion assembly, the outer shell 40 of the expansion tube and the outer clamping ring 401 and the inner clamping ring 411 at the end of the inner shaft 41 of the expansion tube, together with the outer abutment ring 421 inside the outer cylinder 42 and the inner abutment ring 431 inside the inclined shaft 43, form a bidirectional internal and external clamping structure: when the power... When the hydraulic cylinder 31 of the component drives the push rod 32 to move, the inwardly inclined end face of the outer abutment ring 421 presses the outer clamping ring 401 to expand inward, and the outwardly inclined end face of the inner abutment ring 431 presses the inner clamping ring 411 to expand outward, so as to achieve uniform inner and outer support for the thin tube, avoiding the tube wall concavity deformation or cracking caused by the traditional single clamping method. Moreover, the outer clamping ring 401 and the inner clamping ring 411 have a certain deformation margin, which can adapt to copper tubes of a certain diameter during clamping, and clamping can be performed within this range.
[0023] The connecting slider 412 on the inner shaft 41 of the expansion tube extends to the outside of the outer shell 40 of the expansion tube and is fixedly mounted on the feed plate 30 by a fixing plate, moving together with the feed plate 30. The inner wall of the outer shell 40 of the expansion tube is fixedly connected to the expansion head 44 by at least two connecting rods, making both the expansion head 44 and the outer shell 40 stationary. The outer cylinder 42 of the propulsion tube has a through-hole outer cylinder groove 423, and the connecting rod on the expansion head 44 slides in the outer cylinder groove 423. Several expansion blocks are provided inside the expansion head 44, which are evenly distributed circumferentially and slide within the expansion head 44. When the expansion operation is started, the power component drives the propulsion inclined shaft 43 to move axially, and the expansion blocks expand radially synchronously under the guidance of the conical structure inside the expansion head 44, precisely fitting the inner wall of the thin tube to achieve uniform support. In addition, the design of the connecting slider 412 extending to the outside and being fixed to the feed plate 30 ensures the stability of the overall movement of the expansion assembly and avoids clamping offset problems caused by component shaking.
[0024] The outer cylinder 42 is located on the outer periphery of the inclined shaft 43 and is slidably connected to the inner wall of the expansion tube housing 40. The inclined shaft 43 is slidably mounted on the inner shaft 41 of the expansion tube. Both the outer cylinder 42 and the inclined shaft 43 are fixedly mounted on the push rod 32 and move synchronously with the push rod 32. The side wall of the outer abutment ring 421 is fixedly mounted on the inner wall of the outer cylinder 42 by the outer abutment spring 422. The end of the outer abutment ring 421 near the outer clamping ring 401 is inclined inward, squeezing the outer clamping ring 401 to expand inward. The side wall of the inner abutment ring 431 is fixed by the inner abutment spring 432. Installed on the inner wall of the push shaft 43, the inner abutment ring 431 is inclined outward on the side end near the inner clamping ring 411. The inner clamping ring 411 is squeezed outward to expand. Through the expansion of the outer clamping ring 401 and the inner clamping ring 411, they will abut against the inner and outer walls of the workpiece respectively. Moreover, the inclined angle and height of the outer abutment ring 421 and the inner abutment ring 431 are the same, so the squeezing force of the outer clamping ring 401 and the inner clamping ring 411 is also the same. Therefore, the forces of the two cancel each other out during the clamping process, so that the inner and outer walls of the workpiece can be clamped at the same time without deformation.
[0025] The mounting plate 20 is fixed to the bottom of the worktable 10, corresponding to the feed plate 30. The mounting plate 20 is provided with a placement groove, and at least two limiting pins 21 are provided in the groove for placing the workpiece. The limiting pins 21 and the placement groove only serve to limit the workpiece and do not need to clamp it. This avoids the problem of deformation of thin copper tubes due to clamping. Through the "limiting rather than clamping" design of the limiting pins 21 and the placement groove, the inner wall of the groove and the arc-shaped contact surface of the limiting pins 21 are used to fit the outer wall of the copper tube. With the synchronous equal force expansion clamping of the inner and outer walls of the workpiece by the outer clamping ring 401 and the inner clamping ring 411, the workpiece can be stably positioned without additional clamping, and the deformation problem caused by excessive clamping force is completely avoided.
[0026] Working Principle: During operation, the U-shaped heat exchanger copper tubes are placed on the mounting plate 20 for positioning. Then, the equipment is started. First, the motor controls the feed screw 11 to rotate, which, through the feed threaded block 301, moves the entire feed plate 30 towards the side closer to the mounting plate 20 until it passes the outer periphery of the expansion head 44 inside the expansion tube housing 40 and stops. Then, the hydraulic cylinder 31 is activated, pushing the push rod 32 to move the two push shafts 43 and the outer push cylinder 42 synchronously towards the side closer to the mounting plate 20. At this time, the movement of the outer push cylinder 42 is driven by the outer abutment spring 422, which in turn moves the outer abutment... When the connecting ring 421 enters the inner side of the outer clamping ring 401, the inclined surface of the outer abutting ring 421 will cause the outer clamping ring 401 to expand inward, thereby abutting against the outer wall of the copper tube. At the same time, the movement of the pushing inclined shaft 43 will also cause the inner abutting ring 431 to enter the inner side of the inner clamping ring 411 through the inner abutting spring 432. Then, the inclined surface of the inner abutting ring 431 will cause the inner clamping ring 411 to expand outward and abut against the inner wall of the copper tube. Moreover, the abutting positions of the outer clamping ring 401 and the inner clamping ring 411 are the same and the force is consistent, so it will not cause damage to the copper tube. At this time, the clamping operation is completed.
[0027] Then, the outer cylinder 42 and the inclined shaft 43 continue to move, which compresses the outer abutment spring 422 and the inner abutment spring 432, causing the outer clamping ring 401 and the inner clamping ring 411 to further squeeze the workpiece, thereby clamping the workpiece and preventing it from shaking and affecting the tube expansion process. As the inclined shaft 43 continues to move, the inclined surface of the inclined shaft 43 will abut against the tube expansion block on the tube expansion head 44, causing the tube expansion block to slide synchronously away from the inner shaft 41 of the tube expansion and abut against the copper tube, thereby causing the copper tube to expand outward until the inclined shaft 43 completes the expansion process.
[0028] After the tube expansion is completed, the hydraulic cylinder 31 drives the push rod 32 to retract to the side away from the mounting plate 20. At this time, the outer cylinder 42 and the push shaft 43 move to the side away from the mounting plate 20. First, the tube expansion head 44 will retract inward simultaneously (annular springs are set in multiple tube expansion heads 44, which is the prior art). Then, the outer abutment spring 422 and the inner abutment spring 432 are relaxed until the outer abutment ring 421 and the inner abutment ring 431 are pulled out from the outer clamping ring 401 and the inner clamping ring 411. At this time, the outer clamping ring 401 and the inner clamping ring 411 no longer clamp the copper tube. After the hydraulic cylinder 31 drives the push rod 32 to retract completely, the motor starts and drives the feed plate 30 to retract as a whole through the feed screw 11, so that the tube expansion shell 40 can be separated from the copper tube. Then the operator can directly remove the copper tube. By integrating the clamping component into the tube expansion head, the workpiece is clamped by the force during the tube expansion process, saving consumption.
[0029] In summary, this thin-walled tube adaptive synchronous clamping and expansion device effectively solves the problem of easy deformation when clamping thin-walled tube workpieces by using the outer clamping ring 401, inner clamping ring 411, outer abutment ring 421, and inner abutment ring 431 in cooperation with the expansion assembly. Specifically, by applying clamping forces simultaneously from the outer and inner walls of the copper tube by the outer clamping ring 401 and inner clamping ring 411 respectively, the clamping force is evenly distributed on the circumference of the copper tube, and the clamping forces of the inner and outer walls cancel each other out, thus clamping the workpiece and preventing it from being deformed. Through the integrated design of the expansion assembly and clamping assembly, when the hydraulic cylinder 31 pushes the push rod 32 to move, the clamping action of the outer clamping ring 401 and inner clamping ring 411 and the expansion action of the expansion block can be completed simultaneously. The switching between clamping and expansion does not require additional operation steps, which greatly improves its working efficiency and eliminates the need for external clamping devices, thus reducing costs.
[0030] 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0031] 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. A thin-walled tube adaptive synchronous clamping and expanding device, comprising a worktable (10), wherein a mounting plate (20) and a feed plate (30) are provided inside the worktable (10), wherein the mounting plate (20) is fixedly installed inside the worktable (10), and the feed plate (30) is movably installed inside the worktable (10), characterized in that: The mounting plate (20) is provided with a limiting structure, and the feed plate (30) is provided with at least two expansion components and a power component, with the power component connected to the expansion component; The expansion assembly includes an expansion tube outer shell (40), an expansion tube inner shaft (41), a propulsion outer cylinder (42), a propulsion inclined shaft (43), and an expansion tube head (44). The expansion tube inner shaft (41) is located at the center of the expansion tube outer shell (40), and the expansion tube inner shaft (41) is fixedly connected to the expansion tube outer shell (40) via a connecting slider (412). External clamping rings (401) are fixed to the ends of the expansion tube outer shell (40) and the expansion tube inner shaft (41), respectively. The inner clamping ring (411) and the inner clamping ring (421) are mounted on the inner shaft (41) of the expansion tube. The outer cylinder (42) is located on the inner wall of the outer shell (40) of the expansion tube. The outer abutting ring (421) and the inner abutting ring (431) are slidably arranged inside the two, respectively. The inner abutting ring (431) cooperates with the inner clamping ring (411), and the outer abutting ring (421) cooperates with the outer clamping ring (401) to provide the inner and outer clamping function of the thin tube.
2. The thin-walled tube adaptive synchronous clamping and expanding device according to claim 1, characterized in that: The connecting slider (412) on the inner shaft (41) of the expansion tube extends out of the outer shell (40) of the expansion tube and is fixedly installed on the feed plate (30), moving together with the feed plate (30). The inner wall of the outer shell (40) of the expansion tube is fixedly connected to the expansion head (44) by at least two connecting rods. The outer cylinder (42) of the propulsion cylinder is provided with a through outer cylinder groove (423).
3. The thin-walled tube adaptive synchronous clamping and expanding device according to claim 2, characterized in that: The connecting rod on the expansion head (44) slides in the outer cylinder groove (423). Several expansion blocks are provided in the expansion head (44), which are evenly distributed circumferentially and slide in the expansion head (44).
4. The thin-walled tube adaptive synchronous clamping and expanding device according to claim 1, characterized in that: The outer cylinder (42) is located on the outer periphery of the propulsion inclined shaft (43) and is slidably connected to the inner wall of the expansion tube shell (40). The propulsion inclined shaft (43) is slidably mounted on the inner shaft (41) of the expansion tube. The outer cylinder (42) and the propulsion inclined shaft (43) are both fixedly mounted on the propulsion rod (32) and move synchronously with the propulsion rod (32).
5. A thin-walled tube adaptive synchronous clamping and expanding device according to claim 1 or 4, characterized in that: The side wall of the outer abutment ring (421) is fixedly installed on the inner wall of the outer push cylinder (42) by the outer abutment spring (422). The outer abutment ring (421) is inclined inward at one end near the outer clamping ring (401), and the outer clamping ring (401) is squeezed to expand inward. The side wall of the inner abutment ring (431) is fixedly installed on the inner wall of the propulsion inclined shaft (43) by the inner abutment spring (432). The side end of the inner abutment ring (431) near the inner clamping ring (411) is inclined outward, squeezing the inner clamping ring (411) to expand outward.
6. The thin-walled tube adaptive synchronous clamping and expanding device according to claim 1, characterized in that: The power assembly includes a hydraulic cylinder (31) fixed on the feed plate (30) and a push rod (32) mounted on the telescopic rod of the hydraulic cylinder (31). There are at least two push rods (32) corresponding to the expansion assembly, and one end of the push rod (32) is fixed on the expansion assembly.
7. The thin-walled tube adaptive synchronous clamping and expanding device according to claim 6, characterized in that: The push rod (32) has a notch, which corresponds to the connecting slider (412), so that the notch and the connecting slider (412) slide relative to each other.
8. The thin-walled tube adaptive synchronous clamping and expanding device according to claim 1, characterized in that: The mounting plate (20) is fixed to the bottom of the worktable (10) and corresponds to the feed plate (30). The mounting plate (20) is provided with a placement groove, and at least two limiting pins (21) are provided in the groove for placing the workpiece.
9. The thin-walled tube adaptive synchronous clamping and expanding device according to claim 1, characterized in that: The worktable (10) is also provided with a slide rail groove. The bottom of the feed plate (30) is fixed with a feed thread block (301). The feed thread block (301) slides in the slide rail groove. The worktable (10) is also rotatably installed with a feed screw (11). The feed screw (11) passes through the feed thread block (301) and is threadedly engaged with the feed thread block (301). The other end of the feed screw (11) extends to the outside.
10. The thin-walled tube adaptive synchronous clamping and expanding device according to claim 9, characterized in that: One side of the hydraulic cylinder (31) is connected to an external oil tank via a hose. The external part of the feed screw (11) is equipped with a motor. Both the hydraulic cylinder (31) and the motor are controlled by a control system for feeding.