A device for preventing deformation during cutting of thin-walled pipe fittings
By combining uniform airbag support with arc-shaped rubber grippers, the problem of deformation during the cutting of thin-walled titanium tubes is solved, achieving a highly efficient and deformation-free cutting effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI ZHUOZUN PRECISION MASCH CO LTD
- Filing Date
- 2025-06-28
- Publication Date
- 2026-05-26
AI Technical Summary
In the cutting process of titanium thin-walled tubes, the existing technology has insufficient contact area between the clamp and the tube wall or high surface roughness, which leads to excessive local pressure and the inability to release thermal stress, resulting in deformation of the tube.
The airbags uniformly support the tube wall, forming a 360° radial support force through air pressure. Combined with arc-shaped rubber claws and rubber pads, they achieve uniform contact and flexible clamping, suppressing high-frequency vibration and thermal stress. The outer layer of the airbags is wrapped with a ceramic fiber heat insulation layer to reduce heat conduction.
It effectively suppresses deformation during the cutting process, reduces thermal expansion, avoids thermal stress accumulation caused by rigid clamping, and improves cutting effect by 70%.
Smart Images
Figure CN224274216U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of pipe cutting, and in particular to a device for preventing deformation during thin-walled pipe cutting. Background Technology
[0002] During the production of titanium thin-walled tubes, especially titanium welded tubes with a thickness of 0.6 mm or more, tube end deformation may occur during wire cutting.
[0003] In existing technologies, some methods involve setting a cutting slit in the clamping groove, placing the titanium tube into the clamping groove, and using a telescopic cylinder to push the pushing block to clamp the titanium tube in the clamping groove to prevent deformation. However, the above methods still have some problems. If the contact area between the inner support clamp and the tube wall is insufficient or the surface roughness is high (e.g., Rz > 10μm), point contact or line contact will be formed, and the local pressure can reach 100-200MPa (exceeding the yield strength of aluminum alloy). At the same time, the tube expands due to heat during the cutting process, and the clamp is rigidly fixed, so the thermal stress cannot be released, which will cause the tube to bend along the axis.
[0004] Therefore, in order to solve the above problems, this application provides a device for preventing deformation during the cutting of thin-walled pipe fittings. Utility Model Content
[0005] To address the problem of deformation during the cutting of thin-walled pipes, this application provides a device to prevent deformation during the cutting of thin-walled pipes.
[0006] This application provides a device for preventing deformation during the cutting of thin-walled pipe fittings, comprising a base plate, a fixed seat, a lifting seat, and an internal support structure. The fixed seat is fixedly installed on the top of the base plate, and the lifting seat is slidably installed inside the fixed seat. The internal support structure includes: a guide electric push rod fixedly installed on the top of the lifting seat; an air pump fixedly installed on one side of the guide electric push rod; an airbag located on the side of the guide electric push rod near the base plate; a connecting plate fixedly installed inside one side of the airbag; the output end of the guide electric push rod fixedly connected to the connecting plate; one side of the airbag connected to a one-way inflation valve and a deflation valve via a three-way connector; a pressure sensor located between the one-way inflation valve and the deflation valve; an air supply pipe connected between one side of the air pump and the one-way inflation valve; the air supply pipe being extendable and retractable; a solenoid valve located at the end of the air pump near the air supply pipe; and the pressure sensor connected to the solenoid valve via a PLC controller.
[0007] Preferably, the airbag body adopts a double-layer composite structure, with an inner layer of fluororubber and an outer layer of nylon fiber reinforcement, and the outer layer of the airbag is wrapped with a ceramic fiber heat insulation layer.
[0008] Preferably, the outer surface of the airbag has three spiral guide grooves along the axial direction.
[0009] Preferably, three annular elastic support rings are embedded in the middle of the airbag.
[0010] Preferably, the fixed base has through grooves on both sides near the lifting base, and sliders are slidably installed in both grooves. Both sliders are fixedly connected to the lifting base. A screw is rotatably installed in one of the grooves and is threadedly connected to one of the sliders. A limit rod is fixedly installed in the other groove and slides with the other slider. A motor is fixedly installed on the top of the fixed base, and the output end of the motor is fixedly connected to the top of the screw through a coupling.
[0011] Preferably, the top of the base plate is provided with two clamping mechanisms, each clamping mechanism comprising: a cylinder fixedly mounted on the top of the base plate; a cross plate fixedly mounted on the output end of the top of the cylinder; grippers on both sides of the cross plate; connecting shafts fixedly mounted on both sides of the cross plate and the two grippers; a connecting rod rotatably mounted between the connecting shaft on one side of the cross plate and the connecting shaft on one side of the grippers; an opening on the top of each of the two grippers; a fixing block fixedly mounted on the top of the cylinder near the two openings; and the grippers rotatably connected to the fixing blocks via the fixing shafts.
[0012] Preferably, rubber pads are fixedly installed on the top and bottom of the two grippers on opposite sides.
[0013] Preferably, baffles are fixedly installed on both sides of the top of the cylinder, and both ends of the fixed shaft are rotatably connected to the baffles.
[0014] Compared with the prior art, the advantages and positive effects of this utility model are as follows:
[0015] In this invention, the three-dimensional uniform support force is distributed. The airbag expands evenly and fits the pipe wall through air pressure, forming a 360° radial support force. This eliminates the point contact stress concentration of traditional rigid internal supports. The arc-shaped rubber claws wrap the outer wall of the pipe with rubber pads, and the contact area is ≥1 / 3 of the pipe circumference, avoiding local compression deformation. The combination of the elastic buffer of the airbag and the flexible clamping of the outer clamp can suppress high-frequency vibration during the cutting process, improving the effect by 70% compared with a single outer clamp.
[0016] Thermal stress control: a balance between rigid support and heat release, a dual mechanism to suppress thermal deformation, and fluororubber airbags that can block 30% to 40% of the cutting heat from being conducted to the inner wall of the pipe, reducing thermal expansion. The rubber pads of the clamps allow the pipe to undergo a slight axial displacement (±0.1mm) due to thermal expansion, avoiding the accumulation of thermal stress caused by rigid clamping. Attached Figure Description
[0017] Figure 1 This is a perspective view of an embodiment of this application;
[0018] Figure 2 This is a perspective view of the clamping mechanism according to an embodiment of this application;
[0019] Figure 3 This is a perspective cross-sectional view of the fixing base according to an embodiment of this application;
[0020] Figure 4 This is a perspective view of the airbag in an embodiment of this application;
[0021] Figure 5 This is a three-dimensional cross-sectional view of the airbag in an embodiment of this application.
[0022] Explanation of reference numerals in the attached drawings: 1. Base plate; 2. Cylinder; 3. Fixed seat; 4. Motor; 5. Guide electric push rod; 6. Air pump; 7. Airbag; 8. Gripper; 9. Fixed block; 10. Connecting rod; 11. Fixed shaft; 12. Rubber pad; 13. Cross plate; 14. Lifting seat; 15. Slider; 16. Screw; 17. Limiting rod; 18. T-connector; 19. Air supply pipe; 20. Elastic support ring; 21. Connecting plate. Detailed Implementation
[0023] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0024] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.
[0025] Example 1, as Figure 1-5 As shown, this utility model provides a device for preventing deformation during the cutting of thin-walled pipe fittings, including a base plate 1, a fixed seat 3, a lifting seat 14, an internal support mechanism, a drive mechanism, and a clamping mechanism.
[0026] A fixed seat 3 is fixedly installed on the top of the base plate 1, and a lifting seat 14 is slidably installed inside the fixed seat 3;
[0027] The internal support mechanism includes: a guide electric push rod 5 fixedly installed on the top of the lifting seat 14; an air pump 6 fixedly installed on one side of the guide electric push rod 5; an airbag 7 installed on the side of the guide electric push rod 5 near the base plate 1; a connecting plate 21 fixedly installed inside one side of the airbag 7; the output end of the guide electric push rod 5 fixedly connected to the connecting plate 21; one side of the airbag 7 connected to a one-way inflation valve and a deflation valve via a three-way connector 18; a pressure sensor installed between the one-way inflation valve and the deflation valve; an air supply pipe 19 connected between one side of the air pump 6 and the one-way inflation valve; the air supply pipe 19 is telescopic; a solenoid valve is installed at the end of the air pump 6 near the air supply pipe 19; the pressure sensor is connected to the solenoid valve via a PLC controller; the sensor collects the pressure of the airbag 7 in real time, converts it into an electrical signal, and transmits it to the PLC; the PLC... The measured value is compared with the set value, and the control quantity is calculated through the PID algorithm. The output signal drives the air pump 6 to operate (inflate or stop the pump), forming a "measurement-calculation-execution" closed loop. The airbag 7 body adopts a double-layer composite structure. The inner layer is made of fluororubber (temperature resistance -20℃~200℃, Shore hardness 60A), which provides sealing and wear resistance. The outer layer is a nylon fiber reinforcement layer (thickness 0.3mm), which improves tensile strength (≥15MPa). Three spiral guide grooves are opened along the axial direction on the outer surface of the airbag 7 to guide the air during inflation. The airflow forms a spiral motion, enhancing the inner wall fit and reducing positive pressure. Three annular elastic support rings 20 are embedded in the center of the airbag 7. After inflation, the elastic deformation of the steel rings works in conjunction with the airbag 7 to provide support and increase rigidity. The outer layer of the airbag 7 is wrapped with a ceramic fiber insulation layer (2mm thick), increasing the working pressure to 0.4-0.5MPa to counteract gas expansion caused by high temperature. In this embodiment, the airbag 7 is inflated to fill and support, enhancing the rigidity of the inner wall. The inner wall of the fitting is wiped with anhydrous ethanol and then coated with food-grade silicone oil to prevent the airbag 7 from contacting the pipe. If the parts adhere, the guide electric push rod 5 pushes the airbag 7 to the predetermined position, ensuring that the center of the airbag 7 is aligned with the cutting area (deviation ≤1mm). Initially, inflate to 0.1MPa at a rate of 0.05MPa / min, hold for 10 seconds to allow the airbag 7 to initially expand, then continue inflating to the working pressure (0.2-0.5MPa), while monitoring pressure fluctuations (allowable deviation ±0.02MPa). After inflation is complete, close the valve and let stand for 30 seconds to confirm pressure stability (pressure drop ≤0.01MPa). If during cutting... When the pressure sensor detects a pressure drop exceeding 5%, the PLC controls the activation of the solenoid valve box to replenish air (flow rate 1L / min) to maintain stable pressure. After cutting, the vacuum pump (vacuum degree -0.1MPa) is used to quickly evacuate and depressurize the air. After the airbag 7 contracts, it is slowly pulled out along the axial direction (speed ≤5mm / s) to avoid damaging the inner wall of the pipe. Then, compressed air (pressure 0.3MPa) is used to blow away residual dust on the surface of the airbag 7 and check for damage (crack length >2mm requires replacement). Talc powder is then applied to prevent aging.
[0028] The drive mechanism includes: Slide grooves extending through both sides of the fixed base 3 near the lifting base 14; sliders 15 slidably mounted in each of the two slide grooves, both sliders 15 being fixedly connected to the lifting base 14; a screw 16 rotatably mounted in one of the slide grooves, threadedly connected to one of the sliders 15; a limit rod 17 fixedly mounted in the other slide groove, slidingly engaging with the other slider 15; a motor 4 fixedly mounted on the top of the fixed base 3; the output end of the motor 4 being fixedly connected to the top of the screw 16 via a coupling; and the thread between the screw 16 and one of the sliders 15 achieving self-locking. The self-locking condition depends on the thread helix angle, the coefficient of friction, and the load applied. The self-locking condition can be calculated using the following formula: Self-locking condition = Coefficient of friction × tan(helix angle) ≥ 1. When this condition is met, the threaded connection is self-locking. The above content is all existing technology. In actual applications, the corresponding self-locking angle can be set according to the friction coefficient of the material. It will not be elaborated here. When the lifting seat 14 needs to move up and down, the motor 4 is started. The motor 4 drives the screw 16 to rotate. The screw 16 drives one of the sliders 15 to move up and down. One of the sliders 15 drives the lifting seat 14 and the other slider 15 to slide up and down on the limit rod 17, thereby driving the guide electric push rod 5 and the air pump 6 at the top of the fixed seat 3 to move up and down, so as to facilitate the alignment of the thin-walled pipe.
[0029] Example 2, as Figure 1-5As shown, the top of the base plate 1 is provided with two clamping mechanisms. Each clamping mechanism includes: a cylinder 2 fixedly mounted on the top of the base plate 1; a cross plate 13 fixedly mounted on the output end of the top of the cylinder 2; grippers 8 on both sides of the cross plate 13; connecting shafts fixedly mounted on both sides of the cross plate 13 and the two grippers 8; a connecting rod 10 rotatably mounted between the connecting shaft on one side of the cross plate 13 and the connecting shaft on one side of the grippers 8; openings on the top of each gripper 8; fixing blocks 9 fixedly mounted on the top of the cylinder 2 near the two openings; the grippers 8 rotatably connected to the fixing blocks 9 via fixing shafts 11; rubber pads 12 fixedly mounted on the top and bottom of the opposite sides of the two grippers 8; baffles fixedly mounted on both sides of the top of the cylinder 2; and both ends of the fixing shafts 11 rotatably connected to the baffles. Next, the working principle and process of cylinder 2: Intake: Compressed air enters the working chamber inside cylinder 2 through the intake port. Usually, cylinder 2 controls the timing and amount of intake through a pneumatic control valve (such as a solenoid valve); Piston movement: When compressed air enters the inside of cylinder 2, it pushes the piston to move along the axis of cylinder 2. The air pressure causes the piston to move from one position to another, producing linear motion; Exhaust: During the piston movement, the gas on the other side of cylinder 2 is squeezed out and discharged through the exhaust port. The working cycle of cylinder 2 usually includes two stages: the intake stage and the exhaust stage; Stroke control: The stroke of cylinder 2 can be controlled by the design of cylinder 2 or by external control devices (such as position sensors and stroke adjusters). The piston's stroke inside cylinder 2 determines the working range of cylinder 2; buffering: when the piston reaches the end of cylinder 2, the buffer device will play a role in slowing down the piston's movement speed and preventing excessive impact force; return to original position: after completing one working cycle, cylinder 2 returns the piston to its original position by controlling the airflow, preparing for the next working cycle. In this embodiment, before cutting: the clamping mechanism evenly grips the pipe fitting with two jaws 8, and the inner support mechanism inflates the air bag 7 according to the pipe diameter to form a rigid structure of "external clamping and internal support", and starts the cylinder. 2. The output end of cylinder 2 moves upward, causing the cross plate 13 to move up and down. While the cross plate 13 moves up and down, it drives the two grippers 8 to move outward or inward through the connecting shaft, thereby fixing the thin-walled tube between the two clamping mechanisms. The fixed shaft 11 can limit the movement of the two grippers 8 while they rotate. During cutting: the cooling system is set to blow the cutting area synchronously to reduce thermal stress. The monitoring system provides real-time feedback of deformation data. After cutting: the clamping mechanism is released, the inner support mechanism exhausts air, and the guide electric push rod 5 drives the inner support mechanism to leave the inside of the tube, completing the deformation-free cutting.
[0030] Working Principle: During use, the thin-walled tube is placed between two clamping mechanisms. Cylinder 2 is activated, causing its output end to move upwards, driving the cross plate 13 to move up and down. Simultaneously, the cross plate 13 moves up and down, driving the two grippers 8 to move outwards or inwards via the connecting shaft, thus fixing the thin-walled tube between the two clamping mechanisms. The fixing shaft 11 can limit the movement of the two grippers 8 while they rotate. The inner wall of the tube is wiped with anhydrous ethanol and then coated with food-grade silicone oil to prevent the airbag 7 from sticking to the tube. Then, motor 4 is activated, driving screw 16 to rotate. Screw 16 drives one slider 15 to move up and down. One slider 15 drives the lifting seat 14 and the other slider 15 to slide up and down on the limiting rod 17, thereby driving the guide electric push rod 5 and air pump 6 at the top of the fixing seat 3 to move up and down, aligning with the center of the thin-walled tube. The guide electric push rod 5 pushes the airbag 7 to the predetermined position, ensuring that the center of the airbag 7 is aligned with the cutting area (deviation ≤ 1mm). Initially, the cutting speed is 0.05 MPa. Inflate to 0.1 MPa at a rate of a / min, hold for 10 seconds to allow the airbag 7 to initially expand, then continue inflating to the working pressure (0.2-0.5 MPa), while monitoring pressure fluctuations (allowable deviation ±0.02 MPa). After inflation, close the valve and let stand for 30 seconds to confirm pressure stability (pressure drop ≤0.01 MPa). If the pressure sensor detects a pressure drop exceeding 5% during cutting, the PLC controls the activation of the solenoid valve box to replenish air (flow rate 1 L / min) to maintain pressure stability. Simultaneously, a cooling system is set up to synchronously purge the cutting area to reduce thermal stress. The monitoring system provides real-time feedback on deformation data. After cutting, the vacuum pump (vacuum degree -0.1 MPa) quickly evacuates and depressurizes the airbag 7. After the airbag 7 contracts, it is slowly extracted axially (speed ≤5 mm / s) to avoid damaging the inner wall of the pipe. Then, the internal support mechanism exhausts air, and the guide electric push rod 5 drives the internal support mechanism away from the inside of the pipe, releasing the clamping mechanism and removing the cut thin-walled pipe, completing the deformation-free cutting.
[0031] The foregoing described an exemplary embodiment of a thin-walled pipe cutting anti-deformation device provided by this disclosure with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.
Claims
1. A device for preventing deformation during thin-walled pipe cutting, comprising a base plate (1), a fixed seat (3), a lifting seat (14), and an internal support structure, characterized in that: A fixed seat (3) is fixedly installed on the top of the base plate (1), and a lifting seat (14) is slidably installed inside the fixed seat (3). The internal support structure includes: a guide electric push rod (5) fixedly installed on the top of the lifting seat (14), an air pump (6) fixedly installed on one side of the guide electric push rod (5), an airbag (7) provided on the side of the guide electric push rod (5) near the base plate (1), and a connecting plate (21) fixedly installed inside one side of the airbag (7). The output end of the rod (5) is fixedly connected to the connecting plate (21). One side of the airbag (7) is connected to the one-way inflation valve and the deflation valve through a three-way connector (18). A pressure sensor is provided between the one-way inflation valve and the deflation valve. An air supply pipe (19) is connected between one side of the air pump (6) and the one-way inflation valve. The air supply pipe (19) can be extended and retracted. A solenoid valve is provided at one end of the air pump (6) near the air supply pipe (19). The pressure sensor is connected to the solenoid valve through a PLC controller.
2. The anti-deformation device for cutting thin-walled pipe fittings according to claim 1, characterized in that: The airbag (7) has a double-layer composite structure, with an inner layer of fluororubber and an outer layer of nylon fiber reinforcement. The outer layer of the airbag (7) is wrapped with a ceramic fiber heat insulation layer.
3. The anti-deformation device for cutting thin-walled pipe fittings according to claim 2, characterized in that: The outer surface of the airbag (7) has three spiral guide grooves along the axial direction.
4. The anti-deformation device for cutting thin-walled pipe fittings according to claim 3, characterized in that: Three annular elastic support rings (20) are embedded in the middle of the airbag (7).
5. The anti-deformation device for cutting thin-walled pipe fittings according to claim 1, characterized in that: The fixed base (3) has through grooves on both sides near the lifting base (14). Slider (15) is slidably installed in both grooves. Both sliders (15) are fixedly connected to the lifting base (14). A screw (16) is rotatably installed in one of the grooves. The screw (16) is threadedly connected to one of the sliders (15). A limit rod (17) is fixedly installed in the other groove. The limit rod (17) is slidably engaged with the other slider (15). A motor (4) is fixedly installed on the top of the fixed base (3). The output end of the motor (4) is fixedly connected to the top of the screw (16) through a coupling.
6. The anti-deformation device for cutting thin-walled pipe fittings according to claim 1, characterized in that: The top of the base plate (1) is provided with two clamping mechanisms. The clamping mechanisms include: a cylinder (2) is fixedly installed on the top of the base plate (1), a cross plate (13) is fixedly installed on the output end of the top of the cylinder (2), and jaws (8) are provided on both sides of the cross plate (13). A connecting shaft is fixedly installed on both sides of the cross plate (13) and the two jaws (8). A connecting rod (10) is rotatably installed between the connecting shaft on one side of the cross plate (13) and the connecting shaft on one side of the jaws (8). An opening is opened on the top of the two jaws (8). A fixing block (9) is fixedly installed on the top of the cylinder (2) near the two openings. The jaws (8) are rotatably connected to the fixing block (9) through a fixing shaft (11).
7. The anti-deformation device for cutting thin-walled pipe fittings according to claim 6, characterized in that: Rubber pads (12) are fixedly installed on the top and bottom of the two grippers (8) on opposite sides.
8. The anti-deformation device for cutting thin-walled pipe fittings according to claim 6, characterized in that: Both sides of the top of the cylinder (2) are fixedly installed with baffles, and both ends of the fixed shaft (11) are rotatably connected to the baffles.