High quality titanium material heavy extrusion pulling device and method thereof

Abstract

The present application relates to the field of metal extrusion forming and automatic equipment control, in particular to a high-quality titanium material heavy extrusion traction device, comprising a traction vehicle body, a clamping base, a buffer part, a multi-point clamping assembly and an industrial computer; the device cooperatively controls a walking motor and a push rod drive through the industrial computer, and effectively absorbs the traction impact force by using the buffer hydraulic cylinder connected with the energy accumulator; the core is that the multi-point clamping assembly generates sliding displacement compensation when contacting the titanium material by driving the push rod and the wedge-shaped sliding block cooperating with the floating pressing block, so as to realize the multi-point uniform pressure clamping of the uneven surface; the present application avoids the surface indentation and uneven sliding caused by local high pressure, simultaneously reduces the temperature rise of the contact surface and adhesive wear by using the high-temperature-resistant inlay with a heat dissipation air duct, and prolongs the service life of the clamping part under high-temperature heavy load working conditions.

Description

Technical Field

[0001] This invention relates to the field of metal extrusion forming and automated equipment control, specifically to a heavy-duty extrusion traction device and method for high-quality titanium materials. Background Technology

[0002] In current heavy metal extrusion processing conditions, for continuous extrusion processes of titanium materials, the traction device needs to operate under high temperature and heavy load conditions for extended periods. The hot titanium material at the extruder exit often has a temperature exceeding the preset high-temperature threshold and a cross-sectional area exceeding the preset area threshold. Furthermore, due to process characteristics, its exit speed often fluctuates beyond the preset tolerance range. To traction hot titanium material, existing solutions generally employ a rigid traction vehicle combined with a fixed single-point or rigid clamping mechanism. While this solution possesses basic physical traction capabilities, the clamping mechanism lacks a flexible displacement compensation mechanism, making it problematic when dealing with surfaces with varying morphologies. When the titanium material is flat, local high pressure points are easily generated, resulting in indentations and uneven slippage on the hot material surface that exceed the quality standard tolerance. At the same time, heat will accumulate in the traction contact components under continuous high temperature conduction, which will lead to adhesive wear and nonlinear fluctuations in the coefficient of friction. In addition, the existing system lacks a mechanical-hydraulic coupling buffer structure and a dynamic speed response mechanism, and cannot effectively absorb the sudden change in tension caused by the speed fluctuation at the extrusion outlet. This speed mismatch in the traction link causes the titanium material to be damaged or directly broken, and at the moment of unexpected material breakage and loss of load, it causes unexpected acceleration and structural overload damage to the traction equipment.

[0003] Therefore, how to achieve uniform dynamic adjustment of clamping pressure and real-time flexible compensation of traction speed under high temperature and heavy load conditions, so as to reduce material indentation defects, material breakage probability and equipment backlash impact, has become an urgent technical problem to be solved. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a high-quality titanium material heavy-duty extrusion traction device and method. Specifically, the technical solution of the present invention is as follows: High-quality titanium heavy-duty extrusion traction device, including: The tractor body has a walking motor installed at its bottom, and its front end is fixedly connected to the main traction rod by flange bolts. The clamping base has symmetrical sliding tracks machined inside. A buffer section is provided between the tractor body and the clamping base, including a buffer pressure cylinder and an accumulator. The piston rod of the buffer pressure cylinder is connected to the main traction rod, and its cylinder body is fixedly connected to the tail of the clamping base. Its rodless chamber is connected to the accumulator through a high-pressure oil pipe. A multi-point clamping assembly is disposed within the clamping base, including a drive push rod, a wedge-shaped slider, a floating pressure block, and a high-temperature resistant insert. The drive push rod is threaded to the tail of the wedge-shaped slider, and the wedge-shaped slider is fitted and installed in the slide rail. Its inner inclined surface is in contact with the floating pressure block, and the front end face of the floating pressure block is fixedly connected to a high-temperature resistant insert for contacting and clamping high-temperature titanium material. An industrial control computer is connected to and controls the walking motor and the drive push rod; a temperature detection device is installed on the traction vehicle body and communicates with the industrial control computer to obtain the real-time temperature of the high-temperature titanium material.

[0005] Furthermore, the floating pressure blocks are arranged side by side, and the back of the floating pressure blocks is machined with dovetail grooves that are at the same angle as the inclined surface of the wedge-shaped slider. The floating pressure blocks are slidably connected to the wedge-shaped slider through the dovetail grooves.

[0006] Furthermore, the front end face of the floating pressure block is fixedly connected to the high-temperature resistant insert by a one-way pin, wherein the high-temperature resistant insert is made of nickel-based high-temperature alloy, and a through heat dissipation channel is machined on the back of the high-temperature resistant insert.

[0007] Furthermore, a rack and pinion transmission mechanism is provided at the bottom of the tractor body, and the travel motor is installed at the bottom of the tractor body through the rack and pinion transmission mechanism.

[0008] Furthermore, an explosion-proof valve is installed on the high-pressure oil pipe, and the explosion-proof valve is electrically connected to and controlled by the industrial control computer.

[0009] Furthermore, the buffer hydraulic cylinder is equipped with a displacement sensor that is electrically connected to and controlled by the industrial control computer.

[0010] Heavy-duty extrusion traction methods for high-quality titanium materials include: S1. Obtain the real-time temperature of the high-temperature titanium material and determine the target clamping force; S2. Control the drive push rod inside the clamping base to push the wedge-shaped slider forward, so that the floating pressure block retracts towards the center and fits against the surface of the high-temperature titanium material; S3. Adjust the thrust of the drive push rod according to the target clamping force; S4. Obtain the rate of change of piston rod displacement of the buffer pressure cylinder, and control the speed of the walking motor accordingly.

[0011] Furthermore, S1 specifically includes: The real-time yield strength of the high-temperature titanium material is obtained based on its real-time temperature, and the target clamping force is determined by combining the total contact area of ​​the high-temperature resistant insert.

[0012] Furthermore, S4 specifically includes: The speed compensation amount is determined based on the displacement change rate of the piston rod and the preset speed conversion coefficient, and the basic drive speed of the walking motor is compensated accordingly based on the extension and retraction state of the piston rod.

[0013] Furthermore, an explosion-proof valve controlled by the industrial control computer is installed on the high-pressure oil pipe, and the step S4 includes: S41. Real-time acquisition of the pressure drop rate on the oil circuit of the buffer pressure cylinder; S42. Determine whether the voltage drop rate exceeds a preset voltage drop rate safety threshold. S43. When the pressure drop rate exceeds the preset pressure drop rate safety threshold, control the explosion-proof valve to open the pressure relief bypass and discharge the high-pressure oil of the accumulator back to the hydraulic oil tank. S44. When the pressure drop rate is less than or equal to the preset pressure drop rate safety threshold, keep the explosion-proof valve closed.

[0014] The present invention has the following beneficial effects: 1. This invention employs a multi-point clamping assembly. Through a drive push rod and wedge-shaped slider in conjunction with a floating pressure block featuring a dovetail groove, sliding displacement compensation is generated upon contact with the titanium material. This achieves multi-point uniform pressure clamping of uneven surfaces, avoiding surface indentations and uneven slippage caused by localized high pressure. Simultaneously, a high-temperature resistant insert with a heat dissipation duct effectively reduces the temperature rise of the contact surface, minimizes adhesive wear caused by high temperatures, and extends the service life of the clamping components under high-temperature, heavy-load conditions.

[0015] 2. This invention utilizes a buffer cylinder and accumulator to form a buffer section, which can effectively absorb sudden changes in tension caused by fluctuations in outlet speed. A displacement sensor obtains the piston rod displacement change rate to dynamically adjust the travel motor speed, achieving real-time flexible compensation of traction speed and reducing the risk of material breakage. Furthermore, the explosion-proof valve on the high-pressure oil pipe is controlled by an industrial control computer to open the pressure relief bypass in case of abnormal pressure drop, eliminating the reverse rebound force at the moment of unload and preventing violent impact and structural damage to the traction equipment. Attached Figure Description

[0016] The following drawings, illustrating embodiments of this application, are incorporated herein by reference and are used to understand this application. The drawings illustrate embodiments of this application and their descriptions, serving to explain the principles of this application. In the drawings, Figure 1 This is a schematic diagram of the overall external structure of the device; Figure 2 This is a schematic diagram of the clamping base and its overall connection structure; Figure 3 This is a schematic diagram of the wedge-shaped slider and its connecting structure; Figure 4 This is a flowchart of the method of the present invention.

[0017] In the diagram: 1. Traction vehicle body; 2. Travel motor; 3. Flange bolt; 4. Main traction rod; 5. Clamping base; 6. Slide rail; 7. Buffer section; 8. Buffer pressure cylinder; 9. Accumulator; 10. Piston rod; 11. Cylinder body; 12. Rodless chamber; 13. High-pressure oil pipe; 14. Multi-point clamping assembly; 15. Drive push rod; 16. Wedge slider; 17. Floating pressure block; 18. High-temperature resistant insert; 20. Dovetail groove; 21. One-way pin; 22. Cooling duct; 23. Gear and rack transmission mechanism; 24. Explosion-proof valve. Detailed Implementation

[0018] In the following description, numerous specific details are set forth to provide a more thorough understanding of this application. However, it will be apparent to those skilled in the art that embodiments of this application may be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described to avoid confusion with embodiments of this application.

[0019] Example 1: like Figure 1 As shown, a high-quality titanium heavy-duty extrusion traction device includes: The tractor body 1 has a walking motor 2 installed at its bottom, and its front end is fixedly connected to the main traction rod 4 by flange bolts 3; Combination Figure 2 As shown, the clamping base 5 has symmetrical sliding tracks 6 machined inside; The buffer section 7 is located between the tractor body 1 and the clamping base 5, and includes a buffer pressure cylinder 8 and an accumulator 9. The piston rod 10 of the buffer pressure cylinder 8 is connected to the main traction rod 4, and its cylinder body 11 is fixedly connected to the tail of the clamping base 5. Its rodless chamber 12 is connected to the accumulator 9 through a high-pressure oil pipe 13. Combination Figure 3 As shown, the multi-point clamping assembly 14 is located in the clamping base 5 and includes a drive push rod 15, a wedge slider 16, a floating pressure block 17 and a high-temperature resistant insert 18. The drive push rod 15 is threaded to the tail of the wedge slider 16. The wedge slider 16 is fitted and installed in the slide rail 6. The inner inclined surface of the wedge slider 16 is in contact with the floating pressure block 17. The front end face of the floating pressure block 17 is fixedly connected to the high-temperature resistant insert 18 for contacting and clamping the high-temperature titanium material. An industrial control computer connects to and controls the walking motor 2 and the drive push rod 15; a temperature detection device is installed on the traction vehicle body 1 and communicates with the industrial control computer to obtain the real-time temperature of the high-temperature titanium material. This device is used in high-temperature and heavy-load conditions during heavy titanium extrusion traction. The traction vehicle 1 is driven by the walking motor 2 to move along the linear direction of extrusion. The main traction rod 4 transmits the traction force to the clamping base 5. The multi-point clamping assembly 14 in the clamping base 5 performs multi-point contact clamping on the hot titanium material. The buffer part 7 is set between the traction vehicle 1 and the clamping base 5 to absorb the sudden change in tension caused by the speed fluctuation of the extrusion press. The accumulator 9 and the buffer hydraulic cylinder 8 form a mechanical-hydraulic coupling buffer structure, so that the transient tension generated during traction is partially absorbed by the hydraulic medium, thereby reducing the risk of titanium material damage and breakage. The left and right symmetrical slides 6 inside the clamping base 5 are used to limit the reciprocating motion direction of the wedge slider 16. When the drive push rod 15 is pushed forward, the wedge slider 16 converts the axial thrust into the lateral clamping force. The floating pressure block 17 forms a multi-point pressure contact with the titanium material surface under the constraint of the wedge surface. The high temperature resistant insert 18 directly contacts the titanium material to withstand high temperature and reduce adhesive wear. The industrial control computer controls the movement of the walking motor 2 and the drive push rod 15 according to the traction speed and clamping force requirements, so that the traction speed and clamping pressure can be adjusted according to the process changes. This embodiment is suitable for continuous extrusion processes where the titanium material temperature reaches a preset high temperature threshold, the cross-sectional area is greater than a preset area threshold, and the exit speed fluctuates. The preset high temperature threshold is determined based on the phase transformation temperature point of the traction titanium alloy, and is usually set to 600℃. The preset area threshold is set based on the rated load of the traction vehicle 1 and the pressure limit of the clamping components, and is usually 2000mm². This can make the clamping force distribution more uniform and reduce the probability of material breakage caused by surface indentation and speed mismatch.

[0020] The floating pressure blocks 17 are arranged side by side. The back of the floating pressure blocks 17 is machined with a dovetail groove 20 that has the same angle as the inclined surface of the wedge slider 16. The floating pressure blocks 17 are slidably connected to the wedge slider 16 through the dovetail groove 20. When the floating pressure blocks 17 are arranged side by side, multiple independent force-bearing units can be formed. The dovetail groove 20 on the back of each floating pressure block 17 is at the same angle as the inclined surface of the wedge slider 16. The dovetail groove 20 and the wedge slider 16 are in sliding fit, so that each floating pressure block 17 can generate displacement compensation within a set stroke range when affected by the unevenness of the titanium material surface. In practice, the wedge-shaped slider 16 moves forward, causing multiple floating pressure blocks 17 to retract inward simultaneously. If the high-temperature resistant insert 18 corresponding to a certain pressure block contacts the titanium material first, the pressure block will retract within the set displacement stroke in the dovetail groove 20, and the other pressure blocks will continue to advance until all inserts are in contact with the surface of the titanium material. This structure redistributes the contact pressure among multiple pressure blocks, reduces the indentation of the hot titanium material surface by local high pressure points, and reduces the problem of uneven slippage caused by single-point clamping. The sliding stroke of the dovetail groove 20 can be set from 0.5mm to 5mm according to the surface morphology of the titanium material and the clamping width to meet the bonding requirements of titanium materials with different cross-sections.

[0021] The front end face of the floating pressure block 17 is fixedly connected to the high temperature resistant insert 18 by a one-way pin 21. The high temperature resistant insert 18 is made of nickel-based high temperature alloy, and the back of the high temperature resistant insert 18 is machined with a through heat dissipation channel. The high-temperature resistant insert 18 is mounted on the front end face of the floating pressure block 17 via a one-way pin 21. The one-way pin 21 is used to restrict the insert from coming out in the opposite direction of the force and to facilitate individual replacement after wear. The high-temperature resistant insert 18 is made of nickel-based high-temperature alloy, which can maintain stable strength and oxidation resistance under high-temperature contact conditions and reduce the tendency to bond with titanium. The back of the insert is machined to form a through-flow heat dissipation duct 22. The heat dissipation duct 22 can be arranged in correspondence with the external air supply channel to carry away the heat accumulated on the back of the insert and reduce the temperature rise of the contact surface. The external air supply channel includes a blower mounted on the traction vehicle body 1, or is connected to the external compressed air network through a high-temperature resistant flexible air pipe to adapt to the reciprocating movement of the traction vehicle body 1. In implementation, the heat dissipation duct 22 can be in the form of straight holes, oblique holes or multiple holes in parallel, and its hole diameter can be selected from 2mm to 8mm to balance heat dissipation area and structural strength; this structure can reduce the fluctuation of friction state caused by overheating of the insert surface and extend the service life of the insert.

[0022] A rack and pinion transmission mechanism 23 is provided at the bottom of the tractor body 1, and the travel motor 2 is installed at the bottom of the tractor body 1 through the rack and pinion transmission mechanism 23. A rack is installed at the bottom of the traction vehicle body 1. The pinion on the output shaft of the travel motor 2 meshes with the rack, converting the rotational motion of the motor into the linear movement of the traction vehicle body 1. This transmission method is suitable for bearing heavy traction loads exceeding the preset rated value and facilitates speed control by the industrial control computer by adjusting the motor speed. In practice, the module of the gear and rack transmission mechanism 23 can be selected from 4 to 10 according to the load, and the tooth surface can be hardened to reduce wear during long-term reciprocating operation. Since the traction vehicle body 1 needs to operate near a high-temperature radiation environment, the mechanism can be equipped with a protective cover and a heat-resistant lubrication method to maintain meshing accuracy and transmission stability. Through this structure, the moving speed of the traction vehicle body 1 can be coordinated with the action of the buffer part 7 and the clamping assembly, providing a stable execution basis for subsequent speed compensation.

[0023] An explosion-proof valve 24 is installed on the high-pressure oil pipe 13. The explosion-proof valve 24 is connected to and controlled by the industrial control computer. The explosion-proof valve 24 is installed on the high-pressure oil pipe 13 and is used to quickly open the pressure relief bypass when the oil pressure drops abnormally or the accumulator 9 is backfilled. The industrial control computer controls the on / off state of the explosion-proof valve 24 through electrical signals. When the traction load is suddenly released or the rate of change of oil pressure exceeds the set threshold, the explosion-proof valve 24 is immediately opened to return the high-pressure oil in the accumulator 9 to the oil tank through the bypass, so as to avoid the piston rod 10 of the buffer pressure cylinder 8 from rebounding in the opposite direction. During implementation, the explosion-proof valve 24 can be selected from electromagnetic control or hydraulic pilot control. Its opening pressure and pressure relief flow can be set according to the volume of the accumulator 9 and the stroke of the hydraulic cylinder. This structure can reduce the impact rebound caused by the tail end of the titanium material leaving the mold or breaking, and reduce the acceleration sprint of the tractor body 1 due to unload.

[0024] A displacement sensor is installed on the buffer hydraulic cylinder 8 and is electrically connected to and controlled by the industrial control computer; The displacement sensor is installed on the outside of the cylinder body 11 of the buffer hydraulic cylinder 8 or at the end of the piston rod 10. It is used to continuously collect the current position and change speed of the piston rod 10 and transmit the displacement signal to the industrial control computer. The industrial control computer obtains the displacement change rate of the piston rod 10 by dividing the displacement difference between adjacent sampling times by the sampling time interval, and then uses the change rate to calculate the instantaneous difference between the extruder outlet speed and the speed of the traction vehicle body 1. In implementation, the displacement sensor can be a magnetostrictive displacement sensor, a linear encoder, or a draw-wire displacement sensor, and the sampling period can be set from 10ms to 50ms to meet the real-time response requirements for speed fluctuations. This data acquisition method allows the motion state of the buffer hydraulic cylinder 8 to be directly quantified, providing input basis for traction motor speed correction.

[0025] Example 2: like Figure 4 As shown, a heavy-duty extrusion traction method for high-quality titanium materials includes: S1. Obtain the real-time temperature of the high-temperature titanium material and determine the target clamping force; S2. The drive push rod 15 inside the control clamping base 5 pushes the wedge slider 16 forward, causing the floating pressure block 17 to shrink towards the center and fit against the surface of the high-temperature titanium material. S3. Adjust the thrust of the drive push rod 15 according to the target clamping force; S4. Obtain the displacement change rate of the piston rod 10 of the buffer pressure cylinder 8, and control the speed of the walking motor 2 accordingly. This method is used to control the traction process of high-temperature titanium material after heavy extrusion. The real-time temperature can be obtained by an infrared thermometer or a contact thermocouple, and the cross-sectional area data can be obtained by the extrusion die specifications, online width and thickness measuring devices, or process formula. The industrial control computer inputs the temperature and cross-sectional area into the clamping pressure calculation module. After obtaining the target clamping force, it controls the drive push rod 15 to push the wedge slider 16 forward, so that the floating pressure block 17 retracts inward and the high-temperature resistant insert 18 contacts the surface of the titanium material. Once the clamping pressure reaches the target value, the drive push rod 15 maintains the set thrust to ensure that the titanium material does not slip during traction and that its surface is not damaged. At the same time, the displacement sensor collects the displacement change rate of the piston rod 10 of the buffer pressure cylinder 8. The industrial control computer corrects the speed of the walking motor 2 based on this change rate, so that the traction speed is adjusted to follow the fluctuation of the extrusion outlet speed. This method makes the clamping force control and traction speed control correspond to the surface state of the titanium material and the dynamic state of the system, respectively, which can reduce local indentation, speed mismatch and breakage problems. In the specific data flow and interaction process, the infrared thermometer sends real-time temperature data to the input register of the industrial computer at a frequency of 10Hz via the 485 serial communication interface using the Modebs-Remote Terminal Unit communication protocol; the online width and thickness measurement device transmits cross-sectional dimension data to the industrial computer via industrial Ethernet; the industrial computer's underlying data acquisition service parses the above heterogeneous data and converts it into a floating-point standard format, then stores it in the shared memory area for the clamping pressure calculation module to call periodically, thereby ensuring the real-time performance and format consistency of the algorithm input data.

[0026] S1 specifically includes: The real-time yield strength of the high-temperature titanium material is obtained based on the real-time temperature, and the target clamping force is determined by combining the total contact area of ​​the high-temperature resistant insert 18. The basic yield strength is obtained from a pre-calibrated test and corresponds to the material parameters of titanium at room temperature or reference temperature. The strength decay is read from a preset curve or table based on the real-time temperature. The curve can be formed by calibrating compression test data in different temperature ranges. The real-time yield strength is used to characterize the ability of the titanium material to resist plastic deformation in the current hot state. The higher the temperature, the greater the strength decay and the lower the real-time yield strength. The critical crushing force is obtained by multiplying the real-time yield strength by the total contact area of ​​the high-temperature resistant insert 18. Its physical meaning is the upper limit of the load at which the surface of the titanium material begins to produce obvious crushing deformation. The target clamping force is calculated by multiplying the critical crushing force by a preset safety ratio coefficient, which can be set to 0.6 to 0.9 to maintain a balance between preventing slippage and preventing indentation. The mathematical expression for setting the target clamping force is as follows:

[0027] in, Preset safety ratio coefficient; Basic yield strength; This represents the intensity reduction caused by temperature. The total contact area; when the real-time temperature... At temperatures above 800℃, surface indentation should be prevented as a priority. Take 0.6; when the real-time temperature At temperatures greater than or equal to 600℃ and less than or equal to 800℃, to prioritize preventing slippage and loss of load, Take a value of 0.8 to 0.9; when the real-time temperature At temperatures below 600℃, to ensure clamping stability, The value is taken as 0.9 to 1.0; the total contact area is obtained by superimposing the effective contact areas of multiple high-temperature resistant inserts 18, and the chamfer and non-contact edge areas of the inserts can be deducted during the calculation; this calculation method directly introduces the temperature change into the clamping pressure setting, so that the thrust output by the drive push rod 15 can be adjusted with the change of the hot material strength.

[0028] S4 specifically includes: The speed compensation amount is determined based on the displacement change rate of piston rod 10 and the preset speed conversion coefficient, and the basic drive speed of walking motor 2 is compensated accordingly based on the extension and retraction state of piston rod 10. The displacement change rate of piston rod 10 reflects the compression and release state of the hydraulic medium in the buffer hydraulic cylinder 8. The industrial control computer multiplies this change rate by a preset speed conversion coefficient to obtain the speed compensation amount. The preset speed conversion coefficient is used to convert the displacement change rate of piston rod 10 into the speed compensation amount of the travel motor 2, and can be set according to the hydraulic cylinder diameter, accumulator 9 volume, hydraulic compression characteristics, and gear and rack transmission mechanism 23 transmission ratio. Its speed compensation amount is:

[0029] in, The preset speed conversion coefficient, Let be the rate of change of displacement of the piston rod. This is the effective working cross-sectional area of ​​the buffer pressure cylinder. This is the compressible bulk modulus of hydraulic oil. The transmission ratio of the gear and rack transmission mechanism is used; the basic drive speed is the initial traction reference speed issued by the industrial control computer based on the preset process exit speed of the extruder; the industrial control computer is connected to the main control system of the extruder via an industrial communication bus to read the preset process exit speed in real time; during implementation, when the piston rod 10 extends, it indicates that the traction speed is relatively ahead, and the industrial control computer reduces the speed of the travel motor 2; when the piston rod 10 retracts, it indicates that the buffer hydraulic cylinder 8 releases stored energy to compensate for the traction lag, and the industrial control computer increases the speed of the travel motor 2; when the piston rod 10 is stationary, it indicates that the speeds of the two are basically the same, and the industrial control computer maintains the basic drive speed; The speed compensation amount can be limited to 5% to 30% of the base drive speed to avoid over-correction leading to new speed fluctuations. This method enables the motion state of the tractor body 1 to be corrected according to the real-time displacement change of the buffer pressure cylinder 8, thereby reducing the risk of tension damage to the titanium material caused by sudden tension changes.

[0030] An explosion-proof valve 24, controlled by an industrial control computer, is installed on the high-pressure oil pipe 13. After S4, the following are included: S41. Real-time acquisition of the pressure drop rate on the oil circuit of the buffer pressure cylinder 8; S42. Determine whether the voltage drop rate exceeds the preset voltage drop rate safety threshold. S43. When the pressure drop rate exceeds the preset pressure drop rate safety threshold, control the explosion-proof valve 24 to open the pressure relief bypass and discharge the high-pressure oil of the accumulator 9 back to the hydraulic oil tank. S44. When the pressure drop rate is less than or equal to the preset pressure drop rate safety threshold, keep the explosion-proof valve 24 closed. This step is used to handle the hydraulic backlash problem after the traction ends or the titanium material breaks unexpectedly; the industrial control computer obtains the pressure change in the high pressure oil pipe 13 of the buffer hydraulic cylinder 8 in real time through the oil circuit pressure sensor, and calculates the pressure drop rate based on the pressure difference between adjacent sampling points and the sampling time interval; the preset pressure drop rate safety threshold can be set from 0.2MPa / s to 1.0MPa / s, and the specific value is determined according to the capacity of the accumulator 9 and the stroke configuration of the hydraulic cylinder; When the pressure drop rate exceeds the threshold, it indicates that the load has suddenly disappeared and may be accompanied by the accumulator 9 releasing pressure in the reverse direction to the hydraulic cylinder. The industrial control computer immediately controls the explosion-proof valve 24 to open the pressure relief bypass and guide the high-pressure oil back to the oil tank to eliminate the rebound thrust of the piston rod 10. When the pressure drop rate does not exceed the safety threshold, the explosion-proof valve 24 remains closed to maintain the normal buffer state. This treatment method can reduce the impact on the traction vehicle body 1 at the moment of loss of load and reduce equipment impact and structural overload.

[0031] This application has been described through the above embodiments; however, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this application to the described embodiments. Those skilled in the art will understand that many more variations and modifications can be made based on the teachings of this application, and all such variations and modifications fall within the scope of protection claimed in this application.

Claims

1. A high-quality titanium heavy-duty extrusion traction device, characterized in that, include: The tractor body (1) has a walking motor (2) installed at its bottom, and its front end is fixedly connected to the main traction rod (4) by flange bolts (3). The clamping base (5) has symmetrical sliding tracks (6) inside. A buffer section (7) is provided between the tractor body (1) and the clamping base (5), including a buffer pressure cylinder (8) and an accumulator (9). The piston rod (10) of the buffer pressure cylinder (8) is connected to the main traction rod (4), and its cylinder body (11) is fixedly connected to the tail of the clamping base (5). Its rodless chamber (12) is connected to the accumulator (9) through a high-pressure oil pipe (13). A multi-point clamping assembly (14) is disposed in the clamping base (5) and includes a drive push rod (15), a wedge slider (16), a floating pressure block (17), and a high-temperature resistant insert (18). The drive push rod (15) is threaded to the tail of the wedge slider (16). The wedge slider (16) is fitted and installed in the slide rail (6). Its inner inclined surface is attached to the floating pressure block (17). The front end face of the floating pressure block (17) is fixedly connected to the high-temperature resistant insert (18) for contacting and clamping high-temperature titanium material. An industrial control computer is connected to and controls the walking motor (2) and the drive push rod (15); a temperature detection device is installed on the traction vehicle body (1) and communicates with the industrial control computer to obtain the real-time temperature of the high-temperature titanium material; The floating pressure blocks (17) are arranged side by side. The back of the floating pressure block (17) is machined with a dovetail groove (20) that is at the same angle as the inclined surface of the wedge slider (16). The floating pressure block (17) is slidably connected to the wedge slider (16) through the dovetail groove (20). The front end face of the floating pressure block (17) is fixedly connected to the high temperature resistant insert (18) by a one-way pin (21). The high temperature resistant insert (18) is made of nickel-based high temperature alloy, and the back of the high temperature resistant insert (18) is processed with a through heat dissipation channel (22). The buffer pressure cylinder (8) is equipped with a displacement sensor that is electrically connected to and controlled by the industrial control computer; The extrusion traction methods for high-quality titanium heavy-duty extrusion traction devices include: S1. Obtain the real-time temperature of the high-temperature titanium material and determine the target clamping force; S2. Control the drive push rod (15) inside the clamping base (5) to push the wedge slider (16) forward, so that the floating pressure block (17) shrinks towards the center and fits against the surface of the high temperature titanium material; S3. Adjust the thrust of the drive push rod (15) according to the target clamping force; S4. Obtain the displacement change rate of the piston rod (10) of the buffer pressure cylinder (8), and control the speed of the walking motor (2) accordingly. S1 specifically includes: The real-time yield strength of the high-temperature titanium material is obtained based on the real-time temperature, and the target clamping force is determined by combining the total contact area of ​​the high-temperature resistant insert (18). S4 specifically includes: The speed compensation amount is determined based on the displacement change rate of the piston rod (10) and the preset speed conversion coefficient, and the basic drive speed of the walking motor (2) is compensated accordingly based on the extension and retraction state of the piston rod (10).

2. The high-quality titanium heavy-duty extrusion traction device according to claim 1, characterized in that, The bottom of the tractor body (1) is provided with a rack and pinion transmission mechanism (23), and the walking motor (2) is installed at the bottom of the tractor body (1) through the rack and pinion transmission mechanism (23).

3. The high-quality titanium heavy-duty extrusion traction device according to claim 1, characterized in that, An explosion-proof valve (24) is installed on the high-pressure oil pipe (13), and the explosion-proof valve (24) is electrically connected to and controlled by the industrial control computer.

4. The high-quality titanium heavy-duty extrusion traction device according to claim 1, characterized in that, An explosion-proof valve (24) controlled by the industrial control computer is installed on the high-pressure oil pipe (13), and after S4, the following is included: S41. Real-time acquisition of the pressure drop rate in the oil circuit of the buffer pressure cylinder (8); S42. Determine whether the voltage drop rate exceeds a preset voltage drop rate safety threshold. S43. When the pressure drop rate exceeds the preset pressure drop rate safety threshold, control the explosion-proof valve (24) to open the pressure relief bypass and discharge the high-pressure oil of the accumulator (9) back to the hydraulic oil tank. S44. When the pressure drop rate is less than or equal to the preset pressure drop rate safety threshold, keep the explosion-proof valve (24) closed.

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