Cold-rolled tube mandrel fracture detection device and method

Abstract

The present invention provides a mandrel fracture detection device and method for a cold rolling tube mill. The device includes a first rolling mill and a first rolling mill, a first angle sensor, a second angle sensor, a working rod, a motor, a chuck seat, a fracture treatment mechanism, a detection passage device, a driving device, and a single-chip microcomputer for controlling the operation of the device; the single-chip microcomputer controls the first rolling mill and the first rolling mill to horizontally move within a horizontal sub-cycle T1 of each rolling sub-cycle, determines whether the working rod is fractured, and further controls whether to intermittently turn on or not turn on the detection passage device and start the driving device. The present invention can control the horizontal feeding speed of the tube blank under the condition that the rolling area in each sub-cycle is equal within multiple rolling sub-cycles to reach the optimum, and detect whether the working rod is fractured through the fracture treatment device, and provide power for the fractured working rod to complete the preparation of the subsequent cold rolling tube. x,best Within a horizontal sub-cycle T1 of each rolling sub-cycle, it horizontally moves, determines whether the working rod is fractured, and then controls whether to intermittently turn on or not turn on the detection passage device and start the driving device. The present invention can control the horizontal feeding speed of the tube blank under the condition that the rolling area in each sub-cycle is equal within multiple rolling sub-cycles to reach the optimum, and detect whether the working rod is fractured through the fracture treatment device, and provide power for the fractured working rod to complete the preparation of the subsequent cold rolling tube.

Description

Technical Field

[0001] The present invention relates to the technical field of cold rolling tube mills, and specifically to a device and method for detecting the fracture of the mandrel of a cold rolling tube mill. Background Art

[0002] In recent years, the market demand for cold-rolled seamless steel tubes has been relatively large. With the development of mechanical precision and high speed, the requirements for the accuracy of cold rolling tube mill equipment have also become higher and higher. During the rolling process, the mandrel serves three functions: providing the rotational movement driven during the rolling process of the tube blank, the feeding movement in the horizontal direction, and preparing the die for the cold-rolled tube finished product. It bears the alternating load caused by the axial rolling force, the reciprocating inertial force of the rack, and the frictional force of the rack. Therefore, the mandrel is an important deformation tool in the mandrel-constrained continuous rolling tube mill. Through the combined action of the rolling mill rolls and the mandrel, the billet is rolled into the required size. The mandrel is connected by a threaded method from the tail stock, the extension rod, and the working rod. Due to the influence of the longitudinal rolling pressure, the horizontal feeding speed in the transverse direction, and rotation during the tube rolling process, the connection between the extension rod connecting the motor and the mandrel and the mandrel rod is a weak point and is prone to fracture. The consequences are, in the lightest case, affecting the quality of the formed metal tube, and in the worst case, leading to malignant accidents such as damage to various components of the cold rolling tube mill, steel piling in the tube mill, and damage to the tube discharging rack;

[0003] However, in the actual use process, the existing device for detecting the fracture of the mandrel of a cold rolling tube mill generally only has an alarm triggered by the fracture of the mandrel. However, for the operating state of the mandrel after fracture and the resulting impacts, it cannot be well handled, and during the entire cold rolling process, it is impossible to control the horizontal feeding speed of the tube blank to reach the optimum under the condition that the rolling area in each rolling sub-cycle is equal within multiple rolling sub-cycles. As a result, the adverse impacts of the fracture of the mandrel of the above-mentioned cold rolling tube mill are still prominent. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a device and method for detecting the fracture of the mandrel of a cold rolling tube mill. By real-time monitoring whether the rotational speed of the second bevel gear in the fracture processing device is zero, it can effectively determine whether the mandrel is fractured. At the same time, under the condition that the rolling area in each rolling sub-cycle of the cold-rolled tube blank is equal within each rolling sub-cycle, the rolling of a rolling sub-cycle of the tube blank can be completed at the optimum horizontal feeding speed of the tube blank. Through the rolling of multiple rolling sub-cycles, the occurrence of bamboo joint-shaped defects can be effectively avoided; in addition, through the cooperation of the fracture processing device and the detection and passing device, the single-chip microcomputer receives the operating state signal of the working rod indirectly reflected by the first angular velocity sensor at the fracture processing device, which is convenient for timely understanding the operating state of the working rod and providing a driving force for the working rod again to make it rotate again, reducing the adverse impact brought by the sudden fracture of the working rod.

[0005] To achieve the above object, the present invention provides the following technical solutions: A cold rolling tube core rod fracture detection device, including a first rolling roll and a first rolling roll disposed on the upper and lower sides of a tube blank to be cold rolled into a cold rolling tube and in the same vertical plane, the first rolling roll and the first rolling roll reciprocate periodically in the horizontal direction where the axis of the tube blank is located, and the device further includes:

[0006] A first angle sensor for real-time monitoring of the real-time angle of the tangent point between the first rolling roll and the first rolling roll and the tube blank during rotation within a horizontal sub-cycle T2, a second angle sensor for real-time monitoring of the real-time angle β of the tube blank and the working rod rotating around its own axis within a rotor sub-cycle T2, a working rod, a motor for driving the tube blank and the working rod to rotate around its own axis within a rotor sub-cycle T2, a chuck seat for limiting and clamping the working rod and the motor, a fracture processing device, a detection passing device, a driving device, and a single-chip microcomputer for controlling the operation of the device; The fracture processing device includes a first bevel gear and a second bevel gear, and the device further includes a first angular velocity sensor for real-time monitoring of the rotation of the second bevel gear; the single-chip microcomputer controls the first rolling roll and the second rolling roll to move horizontally within a horizontal sub-cycle T1 of each rolling sub-cycle at an optimal speed, and detects whether the working rod is broken by real-time monitoring of the third angular velocity of the rotation of the second bevel gear in the fracture processing device, controls whether the detection passing device obstructs the tube blank from passing through to the rolling outlet for unloading according to the detection result of the fracture processing device, and controls whether to start the driving device to drive the broken part of the working rod connected to the fracture processing device to continue rotating at the angular velocity driven by the motor within each rolling sub-cycle.

[0007] As a further limitation of the present invention, the single-chip microcomputer controls the first rolling roll and the second rolling roll to move horizontally within a horizontal sub-cycle T1 of each rolling sub-cycle at an optimal speed, including the following steps: S1: Calculate the first angular velocity of the real-time rotation of the first rolling roll and the second rolling roll within a horizontal sub-cycle T1 according to the real-time rotation angle of the tangent point between the first rolling roll or the second rolling roll and the tube blank monitored by the first angle sensor during rotation within a horizontal sub-cycle T1: Rotation.

[0008] Including the following steps:

[0009] S1: According to the real-time rotation angle of the tangent point between the first rolling roll or the second rolling roll and the tube blank monitored by the first angle sensor during rotation within a horizontal sub-cycle T1 , calculate the first angular velocity of the real-time rotation of the first rolling roll and the second rolling roll within a horizontal sub-cycle T1 :

[0010] ;

[0011] Wherein, θ is the included angle between the inclined outer wall of the conical cross-section of the working rod; µ is the real-time included angle between the tangent point of the first rolling roll or the second rolling roll and the tube blank and the horizontal line;

[0012] S2: Calculate the real-time rotation angle of the tangent point of the first rolling roll or the second rolling roll and the tube blank during rotation within a horizontal sub-period T1 according to the monitoring result of the first angle sensor , and calculate the speeds of the first rolling roll and the second rolling roll along the horizontal direction where the axis of the tube blank is located :

[0013] ;

[0014] Wherein, r is the radius length of the first rolling roll or the second rolling roll;

[0015] S3: Calculate the radius of the circular cross-section of the tube blank at the position of the tangent point of the first rolling roll or the second rolling roll and the tube blank at time t after a horizontal sub-period T1 according to the result of step S2 :

[0016] ;

[0017] At this time, t1 ≤ t ≤ t2, T1 is the time slot of a horizontal sub-period from time 1 to time t1, T2 is the time slot of a rotary sub-period from time t1 to t2, is the outer radius of the circular cross-section of the tube blank at the initial rolling position; 560mm ≤ ≤ 590mm, and the outer radius of the circular cross-section of the cold-rolled tube of the rolled product obtained after N rolling sub-periods is , 505mm ≤ ≤ 530mm;

[0018] S4: Calculate the second angular velocity of the real-time rotation of the working rod driven by the motor according to the real-time angle β of the rotation of the tube blank and the working rod around their own axes within a rotary sub-period T2 monitored by the second angle sensor :

[0019] ;

[0020] Wherein, is the included angle between the tangent point of the first rolling roll or the second rolling roll and the tube blank and the horizontal line after a horizontal sub-period T1, , and l is the gap distance of the annular gap formed between the inner surface of the tube blank and the outer surface of the working rod;

[0021] S5: Calculate the arc length A of the arc path passed by the rotation of the tube blank within a rotary sub-period T2:

[0022] ;

[0023] S6: Construct the optimal speed within a rolling sub-cycle Calculation model:

[0024] ;

[0025] wherein, S is the area formed by multiplying the length of movement within a horizontal sub-cycle T1 by the arc length A rotated within a rotary sub-cycle T2; is the radius of the circular cross-section of the working rod in the vertical direction at the position of the tangent point between the first roll or the second roll and the billet at time t after a horizontal sub-cycle T1, , is the outer radius of the circular cross-section of the working rod at the initial rolling position, 450 mm ≤ ≤ 470 mm; is the reduction in the wall thickness of the billet after a rolling cycle; 0.5 mm 1.5 mm;

[0026] As a further limitation of the present invention, in the formula for calculating the speeds of the first roll and the second roll along the horizontal direction of the billet axis in the S2 step:

[0027] ;

[0028] ;

[0029] Therefore, according to the calculation result of , reverse calculation is performed to obtain in the S1 step, .

[0030] As a further limitation of the present invention, the chuck base includes a mounting frame provided at the right end of the motor. Mounting grooves are provided around the inside of the mounting frame, and a transmission block is connected to each mounting groove on each side of the mounting frame. A first electric telescopic rod is provided on the vertical inner wall at the front side of the mounting frame for moving the first transmission block at the bottom of the mounting frame to the rear side of the device. Ramps are provided between the ends of three adjacent transmission blocks within the two vertical side walls and the horizontal side wall within the mounting frame. A fixed block is provided at the end of the mounting frame, and a spring is provided between the upper part of the fixed block and the bottom end of the last transmission block on the inner wall at the front of the mounting frame;

[0031] The chuck base further includes connection blocks provided at the extensions of each of the transmission blocks towards the direction close to the axis of the tube blank. Each connection block is limited to slide synchronously closer to or away from the axis of the tube blank within the through slots opened in the mounting frame. A clamping block is fixed to each connection block in the direction close to the axis of the tube blank. The chuck base further includes an insert block that is limitedly clamped with the four clamping blocks. The outer wall of the insert block is evenly distributed with involute profiles. A extension rod is fixedly connected to the end of the insert block away from the motor, and the output end of the motor passes through the insert block and is fixedly connected to the extension rod. A working rod is fixed to the end of the extension rod away from the motor. When the clamping blocks are gathered, it can be used for clamping and engaging the insert block.

[0032] As a further limitation of the present invention, an arc portion that changes from high to low counterclockwise from the right side view is provided inside each clamping block. The concave direction of the arc portion faces the location where the axis of the tube blank is located, and teeth that fit with the concave portions of the involute profiles of the insert block are distributed on each arc portion.

[0033] As a further limitation of the present invention, a connection frame assembled with the mounting frame is provided on the front side of the mounting frame, and a cover plate is provided on the extension rod, and the cover plate can be assembled with the connection frame.

[0034] As a further limitation of the present invention, the fracture treatment device includes a mounting frame, and a first rotating sleeve and a second rotating sleeve that are limitedly rotated on the mounting frame respectively. The first bevel gear and the second bevel gear are respectively fixedly connected to the opposite ends of the first rotating sleeve and the second rotating sleeve. A limiting rod is spline-connected to the inner wall of the mounting frame facing the direction of the tube blank. A connecting rod is provided at the end of the limiting rod facing the direction of the tube blank. The connecting rod sequentially passes through the second rotating sleeve and the through hole opened in the second bevel gear from left to right and a mounting member is fixed to the other end. The mounting member is provided with an H-shaped cross-section from the right side view. Mounting sleeves that are sequentially deflected up and down at the left and right ends with the connection point as the fixed point are respectively fixed at the hollow parts of the upper and lower parts of the H shape of the mounting member. A transmission rod is rotatably mounted on each mounting sleeve. A first transmission wheel is provided at the left end of each transmission rod, and a second transmission wheel is provided at the right end. Both of the two first transmission wheels are meshed and driven with the first bevel gear, and both of the two second transmission wheels are meshed with the second bevel gear;

[0035] A spline shaft is rotatably mounted on the side wall of the mounting member away from the connecting rod, and the spline shaft passes through the spline groove opened in the first bevel gear and a tail rod is fixed to the end of the spline shaft close to the side of the tube blank. One end of the tail rod away from the spline shaft is fixedly connected to the end of the working rod.

[0036] As a further limitation of the present invention, the driving device includes a motor disposed on the mounting frame, a second pulley fixed to the output shaft of the motor, and a first pulley fixed to the outer wall of the first rotating sleeve. A transmission belt is drivingly connected between the first pulley and the second pulley.

[0037] As a further limitation of the present invention, the detection and passage device includes a cross bar disposed at the end of the mounting frame, a support block fixed to the distal end of the cross bar, and two sets of second electric telescopic rods disposed on the machine frame. The two sets of second electric telescopic rods are disposed opposite to each other with the axis of the working rod as the center, and are used for intermittently clamping and fixing the support block.

[0038] The present invention also provides a cold rolling tube core rod fracture detection method using the above-described device, including the following steps:

[0039] 1) The single-chip microcomputer controls the first rolling roll and the second rolling roll to horizontally move in the horizontal direction where the axis of the tube blank is located at a speed in a horizontal sub-cycle T1 towards the rolling outlet direction. During the horizontal movement, the single-chip microcomputer controls the first rolling roll (and the second rolling roll to rotate in opposite directions on the outer wall of the tube blank within a horizontal sub-cycle T1. at the same first angular velocity

[0040] 2) Then the single-chip microcomputer controls to turn on the motor, driving the tube blank and the working rod coaxially arranged with it to rotate around its own axis within a rotor sub-cycle T2. One horizontal sub-cycle T1 and one rotor sub-cycle T2 form a rolling sub-cycle.

[0041] 3) The single-chip microcomputer controls to repeat the steps 1)-2) N times. After N rolling sub-cycles, the rolling of one tube blank (4) is completed, and the rolled tube blank is controlled to be unloaded from the rolling outlet.

[0042] 4) The single-chip microcomputer controls the first rolling roll and the second rolling roll to horizontally move from left to right and return to the initial rolling position on the left.

[0043] 5) During each rolling sub-cycle, when the single-chip microcomputer receives that the fourth angular velocity and the fourth angular velocity sensor are 0, it is determined that the working rod is broken at this time, and the detection and passage device is started to prevent the tube blank from passing through to the rolling outlet for unloading. At the same time, the driving device is started to drive the part of the working rod that has been broken and connected to the fracture treatment device to continue to rotate at the angular velocity driven by the motor to complete the rolling of one tube blank.

[0044] The technical effects and advantages of the present invention:

[0045] 1. Through the cooperation of the fracture treatment device and the detection and passage device, when the detection and passage device detaches from the fracture treatment device, the formed channel is used for the formed tube blank to pass through. If the working rod breaks, that is, the fracture treatment device detects an abnormal state. At this time, the detection and passage device maintains the clamping state of the fracture treatment device and stops running. Under the action of this supporting force, the fracture treatment device transmits the state signal of the working rod, facilitating timely understanding of the operating state of the working rod, and at the same time running, providing a driving force for the working rod again to make it rotate again, reducing the adverse impact brought by the sudden fracture of the working rod, and hindering the passage of the tube blank in abnormal situations, reducing the occurrence of malignant accidents such as steel piling in the tube rolling mill and damage to the tube discharging rack.

[0046] 2. Through the setting of the chuck seat structure, the assembly process with the mandrel is realized. Through the set arc portion and pressure sensing strip, when the working rod moves back and forth, the reduction amount suddenly increases, the rolling force is extremely large, etc., the initial pressure of the pressure sensing strip will also change accordingly. That is, the operating state of the extension rod is obtained by reacting to the change in the pressure value of the pressure sensing strip, facilitating real-time monitoring of the operating state of the working rod.

[0047] 3. As other embodiments of the present invention, for the structural setting of the fracture treatment device, the first driving wheel and the second driving wheel at both ends are respectively meshed and driven with the first bevel gear and the second bevel gear. When the working rod drives the first bevel gear to rotate, the first driving wheels on both sides rotate, and then drive the second driving wheel to rotate, and finally drive the second bevel gear to rotate. When the working rod operates normally, the rotational speed transmitted by the second bevel gear is calculated based on the real-time rotational speed of the working rod within one rotor cycle. That is, the rotational speed under normal conditions. Once the working rod breaks, the real-time rotational speed of the second bevel gear monitored by the first angular velocity sensor is 0. The single-chip microcomputer controls the detection and passage device not to open, thereby avoiding the unloading of the tube blank that has not been normally rolled, avoiding the phenomenon of reducing the finished product rate. At the same time, the driving device is started, so that the tube blank rotates at the rotational speed within the same rotor cycle driven by the working rod, completing the rolling of the subsequent tube blank, greatly improving the production efficiency and finished product rate of the cold rolling tube mill.

[0048] 4. The present invention calculates the real-time rotation angle of the first rolling mill or the first rolling mill and the tube blank (the tangent point within one horizontal sub-cycle T1 through real-time monitoring by the first angle sensor. Calculate the first angular velocity of the first rolling mill and the first rolling mill rotating in real time within one horizontal sub-cycle T1. And the speed of the first rolling mill and the first rolling mill along the horizontal direction where the axis of the tube blank is located. Furthermore, according to the calculated Calculate the circular cross-sectional radius of the tube blank at the position of the tangent point between the first rolling mill or the first rolling mill and the tube blank at time t after one horizontal sub-cycle T1. , and then the real-time angle β of the tube blank and the working rod rotating around their own axes within a rotary cycle T2 is obtained by real-time monitoring through the second angle sensor, and the second angular velocity of the working rod driven by the motor is calculated. ; Calculate the arc length A of the arc path that the tube (4) rotates through within one rotary cycle T2; construct A× =S and Optimal speed in a rolling sub-cycle under two constraints Get the model: , the single chip controls the first roller and the second roller to the optimal speed Moving horizontally within a horizontal sub-cycle T1 of each rolling sub-cycle can effectively ensure that within each rolling sub-cycle of the cold-rolled tube billet, under the condition that the rolling area within each sub-cycle is equal, the rolling of one rolling sub-cycle of the tube billet is completed at the optimal horizontal feeding speed of the tube billet. After rolling for multiple rolling sub-cycles, the occurrence of bamboo-shaped defects can be effectively avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a schematic diagram of the overall structure of the cold rolling mill mandrel fracture detection device provided by the present invention;

[0050] Figure 2 A side view of a tube blank, a working rod, a first roller and a second roller provided by the present invention in a horizontal sub-period;

[0051] Figure 3 It is a schematic diagram of the planar structure of the fracture processing device of the present invention;

[0052] Figure 4 It is a schematic diagram of the three-dimensional structure of the fracture processing device of the present invention;

[0053] Figure 5 for Figure 1 A schematic diagram of a first-person perspective stereoscopic structure;

[0054] Figure 6 for Figure 1 A schematic diagram of a second perspective stereoscopic structure;

[0055] Figure 7 It is a schematic diagram of the internal structure of the chuck seat of the present invention;

[0056] Figure 8 This is a schematic diagram of the disassembled structure of the chuck seat of the present invention;

[0057] Figure 9 for Figure 8 Schematic diagram of the second perspective stereoscopic structure.

[0058] In the figure: 1. First motor; 21. First roll; 22. Second roll; 3. Extension rod; 4. Tube blank; 5. Working rod; 6. Tail rod; 7. Spline shaft; 8. First bevel gear; 9. Second bevel gear; 10. Mounting bracket; 11. First angular velocity sensor; 12. First rotating sleeve; 13. First pulley; 14. Second motor; 15. Second pulley; 16. Transmission belt; 17. Transmission rod; 18. Transmission wheel; 19. Mounting piece; 20. Second rotating sleeve; 21. First roll; 22. Second roll; 201. Limit rod; 202. Mounting sleeve; 23. Connecting rod; 24. Mounting frame; 25. Transmission block; 26. Through slot; 27. Spring; 28. First electric telescopic rod; 29. Inclined plane; 30. Block; 31. Teeth; 32. Connecting block; 34. Cover plate; 35. Connecting frame; 36. Insert block; 37. Fixed block; 38. Cross bar; 39. Second electric telescopic rod; 40. Frame; 41. Support block. Detailed implementation manner

[0059] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0060] In the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. For other structures, reference may be made to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0061] Embodiment 1

[0062] As Figures 1-9 shown, the cold rolling tube mandrel fracture detection device provided by the present invention includes a first roll 21 and a second roll 22 disposed on the upper and lower sides of a tube blank 4 to be cold rolled into a cold rolling tube and in the same vertical plane. Driven by the crank and connecting rod mechanism disclosed in the patent with the publication number CN208583814U, the above steps are repeated multiple times to complete a periodic reciprocating motion in the horizontal direction along the axis of the tube blank 4, that is, after the rolling of the tube blank 4, it returns from right to left to the initial rolling position and then moves from left to right again. It is characterized in that the device further includes:

[0063] For real-time monitoring of the real-time angles of the tangent points of the first roll 21 and the second roll 22 with the tube blank 4 during rotation within a horizontal sub-period T2 The first angle sensor, the second angle sensor for real-time monitoring of the real-time angle β of the tube blank 4 and the working rod 5 rotating around their own axes within a rotor cycle T2, the working rod 5, the first motor 1 for driving the tube blank 4 and the working rod 5 to rotate around their own axes within a rotor cycle T2, the chuck seat for limiting and clamping the working rod 5 and the first motor 1, the fracture treatment device, the detection and passage device, the driving device, and the single-chip microcomputer for controlling the operation of the device;

[0064] The fracture treatment device includes a first bevel gear 8 and a second bevel gear 9, and the device further includes a third angular velocity of the first angular velocity sensor for real-time monitoring of the rotation of the second bevel gear 9; The single-chip microcomputer controls the first rolling mill 21 and the second rolling mill 22 to move horizontally within a horizontal sub-cycle T1 of each rolling sub-cycle, and obtains the third angular velocity of the rotation of the second bevel gear 9 in the fracture treatment device through real-time monitoring to detect whether the working rod 5 is broken, control whether the detection and passage device obstructs the tube blank 4 from passing through to the rolling outlet for unloading according to the detection result of the fracture treatment device, and control whether to start the driving device to drive the broken part of the working rod 5 connected to the fracture treatment device to continue rotating at the angular velocity driven by the first motor 1 within each rolling sub-cycle rotation. Rotation.

[0065] In this embodiment, through the chuck seat and the clamping components therein, the connection and clamping of the working rod 5 can be achieved, such as Figure 1 , 2As shown, the tube blank 4 is sleeved on the outer wall of the working rod 5, and cooperates with the periodic reciprocating motion of the first roller 21 and the second roller 22 on the upper outer side of the working rod 5 in the left and right directions to realize the sequential rolling of multiple tube blanks 4. It takes multiple rolling sub-cycles to complete the rolling of one tube blank. Each rolling sub-cycle includes a horizontal sub-cycle T1 and a rotary sub-cycle T2. In a horizontal sub-cycle T1, the first roller 21 and the second roller 22 are turned on to roll the tube blank 4 from left to right. After rolling, the first roller 21 and the second roller 22 are closed in a rotary sub-cycle T2, and the first motor 1 is turned on to first drive the tube blank 4 and the working rod 5 from left to right. The tube blank 4 is fed to the right for a certain length, which is the length of rolling in the next horizontal sub-cycle T1, and then the first motor 1 drives the tube blank 4 and the working rod 5 to rotate around their own axes for a certain angle to complete the rolling sub-cycle; the tube blank 4 is in the annular space formed between the first rolling roller 21 and the second rolling roller 22 and the working rod 5. In the initial state before rolling, an annular gap of equal distance is left between the inner surface of the tube blank 4 and the outer surface of the working rod 5 from left to right on each cross section. In the horizontal sub-cycle T1, the tube blank 4 is subjected to the rolling pressure applied by the first rolling roller 21 and the second rolling roller 22 and is attached to the outer surface of the working table 5. At the same time, the annular gap is formed as the first rolling roller 21 and the second rolling roller 22 rotate. The second roller 22 moves from left to right and disappears, the tube blank 4 undergoes plastic deformation and is gradually rolled into a finished tube. One end of the fracture processing device is connected to the end of the working rod 5, and the other end is arranged in the middle of the detection passage device. When the cold rolling tube mill is running, when the speed of the first bevel gear 8 monitored by the first angular velocity sensor in the fracture processing device is normal, the single chip microcomputer controls the detection passage device and sets the frequency of telescopic movement according to the processing length of a single tube blank 4, so as to realize intermittent clamping of the fracture processing device. When the fracture processing device is clamped, a support force at one end can be provided for the fracture processing device to hinder the passage of the tube blank 4. At this time, the fracture processing device is completely clamped. The rolling process of the formed tube blank 4; when the detection passage device does not clamp the fracture processing device and is separated from it, a channel for the formed tube blank 4 to pass through is formed; if the working rod 5 breaks, that is, when the first angular velocity sensor in the fracture processing device monitors that the rotation speed of the first bevel gear 8 is 0, the single-chip microcomputer controls the detection passage device to maintain the clamping state of the fracture processing device and stop running. Under the effect of the supporting force provided by the detection passage device to the fracture processing device to hinder the passage of the tube blank 4, the tube blank 4 processed by the broken working rod 5, which is a defective product, will not pass, thereby avoiding the increase of the defective rate.The single-chip microcomputer receives in real time the state signal indirectly represented by the first angular velocity sensor in the fracture treatment device, which facilitates timely understanding of the operating state of the working rod 5. After detecting the fracture of the working rod 5, the driving device is controlled to start running, providing a driving force for the working rod 5 again, so that it rotates again at the same angular velocity as that driven by the first motor 1 in the return rotation period of each rolling sub-period, reducing the adverse effects brought by the sudden fracture of the working rod 5, completing the continuous rolling of the current and subsequent billets 4, and detecting the passage of the billet 4 under abnormal conditions of the passing device, facilitating personnel to timely check and detect whether the rolling of the billet 4 is qualified under abnormal conditions.

[0066] Embodiment 2

[0067] As another preferred embodiment of the present invention, in order to ensure that in each rolling sub-period of cold-rolled billets, under the condition of limiting the equal rolling area in each sub-period, the rolling of a rolling sub-period of the billet is completed at the optimal horizontal feeding speed of the billet, and the occurrence of bamboo joint-shaped defects can be effectively avoided through the rolling of multiple rolling sub-periods, the single-chip microcomputer controls the first rolling roll 21 and the second rolling roll 22 to move horizontally at the optimal speed in a horizontal sub-period T1 of each rolling sub-period, including the following steps:

[0068] S1: According to the real-time rotation angle of the tangent point between the first rolling roll 21 or the second rolling roll 22 and the billet 4 during rotation in a horizontal sub-period T1 monitored by the first angle sensor calculate the first angular velocity of the real-time rotation of the first rolling roll 21 and the second rolling roll 22 in a horizontal sub-period T1 :

[0069] ;

[0070] wherein, θ is the included angle of the inclined outer wall of the conical section of the working rod 5; µ is the real-time included angle between the tangent point of the first rolling roll 21 or the second rolling roll 22 and the billet 4 and the horizontal line;

[0071] S2: According to the real-time rotation angle of the tangent point between the first rolling roll 21 or the second rolling roll 22 and the billet 4 during rotation in a horizontal sub-period T1 monitored by the first angle sensor calculate the speed of the first rolling roll 21 and the second rolling roll 22 along the horizontal direction where the axis of the billet 4 is located :

[0072] ;

[0073] wherein, r is the radius length of the first rolling roll 21 or the second rolling roll 22; the radius lengths of the first rolling roll 21 and the second rolling roll 22 are the same, both being r;

[0074] S3: According to the result of step S2, calculate the radius of the circular cross-section of the tube blank 4 at the position of the tangent point between the first roll 21 or the second roll 22 and the tube blank 4 at time t after a horizontal sub-cycle T1. :

[0075] ;

[0076] At this time, t1 ≤ t ≤ t2, T1 is the time slot of a horizontal sub-cycle from time 1 to time t1, and T2 is the time slot of a rotary sub-cycle from time t1 to time t2. is the outer radius of the circular cross-section of the tube blank 4 at the initial rolling position; 560 mm ≤ ≤ 590 mm. The outer radius of the circular cross-section (i.e., the outer diameter of the tube) of the cold-rolled tube, which is the rolled product obtained after N rolling sub-cycles, is 505 mm ≤ ≤ 530 mm;

[0077] S4: According to the real-time angle β of the rotation of the tube blank 4 and the working rod 5 around their own axes within a rotary sub-cycle T2 monitored by the second angle sensor in real time, calculate the second angular velocity of the real-time rotation of the working rod 5 driven by the first motor 1. :

[0078] ;

[0079] Among them, is the included angle between the tangent point of the first roll 21 or the second roll 22 and the tube blank 4 and the horizontal line after a horizontal sub-cycle T1. , and l is the gap distance of the annular gap formed between the inner surface of the tube blank 4 and the outer surface of the working rod 5.

[0080] S5: Calculate the arc length A of the arc-shaped path passed by the rotation of the tube blank 4 within a rotary sub-cycle T2:

[0081] ;

[0082] S56: Construct an optimal speed acquisition model within a rolling sub-cycle:

[0083] ;

[0084] Among them, S is the area formed by multiplying the length of the movement within a horizontal sub-cycle T1 by the arc length A rotated within a rotary sub-cycle T2. is the radius of the circular cross-section of the working rod 5 in the vertical direction at the position of the tangent point of the first roll 21 or the second roll 22 and the tube blank at time t after a horizontal sub-cycle T1. , is the radius of the circular cross-section of the working bar 5 at the initial rolling position, 450 mm ≤ ≤ 470 mm; 0.5 mm 1.5 mm; The value of S is fixed, that is, through the limitation of A × = S, it can be ensured that the optimal value within each obtained horizontal sub-cycle T1 refers to the condition that the rolling area in each rolling sub-cycle is fixed and the same within N rolling sub-cycles.

[0085] Furthermore, in the calculation formula of the speeds of the first roll 21 and the second roll 22 in the horizontal direction along the axis of the tube blank 4 in step S2 :

[0086] ;

[0087] ;

[0088] Therefore, according to the calculation result, a reverse calculation is performed to obtain in step S1, .

[0089] Embodiment 3

[0090] As another preferred embodiment of the present invention, the chuck base includes a mounting frame 24 provided at the right end of the first motor 1. Installation grooves are provided around the inside of the mounting frame 24, and a transmission block 25 is connected to each installation groove on each side of the mounting frame 24. A first electric telescopic rod 28 is provided on the vertical inner wall at the front side of the mounting frame 24 for moving the first transmission block 25 at the bottom of the mounting frame 24 to the rear side of the device, so that the first transmission block 25 is sequentially adjacent in a counterclockwise direction starting from the right side view. A slope 29 is provided between the ends of three adjacent transmission blocks 25 on the two vertical side walls and the horizontal side wall inside the mounting frame 24. When the first transmission block 25 moves, the slope 29 is used to drive the adjacent transmission blocks 25 to operate. A fixing block 37 is provided at the end of the mounting frame 24, and a spring 27 is provided between the upper part of the fixing block 37 and the bottom end of the last transmission block 25 on the inner wall of the front part of the mounting frame 24;

[0091] The chuck base further includes a connecting block 32 provided on the extension of each driving block 25 towards the axis direction of the tube blank 4. Each connecting block 32 is synchronously limited to slide closer to or away from the axis of the tube blank 4 within the through slot 26 opened in the mounting frame 24. A clamping block 30 is fixed in the direction of each connecting block 32 towards the axis of the tube blank 4. The chuck base further includes an inserting block 36 that is limitedly clamped with the four clamping blocks 30. The outer wall of the inserting block 36 is evenly distributed with involute profiles. The end of the inserting block 36 away from the first motor 1 is fixedly connected with an extension rod 3. The output end of the first motor 1 passes through the inserting block 36 and is fixedly connected with the extension rod 3; a working rod 5 is fixed at the end of the extension rod 3 away from the first motor 1; when the clamping blocks 30 gather, it can be used for the clamping and engagement of the inserting block 36.

[0092] Further, an arc portion that changes from high to low counterclockwise from the right side view is provided on the inner side of each clamping block 30. The concave direction of the arc portion faces the position where the axis of the tube blank 4 is located, and each arc portion is distributed with teeth 31 that fit the concave portions of the involute profiles of the inserting block 36. This is used to ensure that when the first motor 1 drives the working rod 5 and the tube blank 4 to rotate through the extension rod 3, due to the pressing of the first rolling roll 21 and the second rolling roll 22, it sways left and right and back and forth, resulting in inconsistent horizontal rolling areas of the first rolling roll 21 and the second rolling roll 22 on the tube blank 4 in each rolling sub-cycle. Furthermore, it avoids the occurrence of defective products with a bamboo joint shape in the cold-rolled tube formed after multiple rolling sub-cycles.

[0093] Through the setting of the chuck base structure, as Figure 7 、 8 and shown in 9, during use, the inserting block 36 where the extension rod 3 is located is inserted into the area where the mounting frame 24 is located. At this time, the inserting block 36 is placed within the area of the four clamping blocks 30. When the first electric telescopic rod 28 is driven to extend and work, it can drive the first driving block 25 to move. Under the action of the inclined surface 29, it can continue to push the adjacent driving block 25 to move, so as to realize the clockwise movement of the four driving blocks 25 while the connecting block 32 is synchronously limited to slide closer to the axis of the tube blank 4 within the through slot 26 opened in the mounting frame 24, thereby compressing the spring 27 at the end of the mounting frame 24. At this time, the movement of the driving block 25 can drive the clamping block 30 to move. Due to the shape setting of the clamping block 30, the middle area decreases during its movement, that is, the arc portion of the clamping block 30 gradually approaches the outer wall of the inserting block 36 until the outer wall of the inserting block 36 is clamped through the teeth 31, and the assembly of the two can be realized. And during the successive rolling of multiple tube blanks 4, the second telescopic rod 28 is always kept in the state of extending and abutting against the first driving block 25 until the single-chip microcomputer controls the detection and passage device to open and release the last rolled tube blank 4. Then the single-chip microcomputer controls the second telescopic rod 28 to retract. Under the retraction force of the compressed spring 27, it is successively in the right side view of Figure 7The retraction force of the middle spring 27 drives the last transmission block 25 to the first transmission block 25 to return to the initial state in a clockwise direction in turn. Further, a plurality of clamping blocks 30 all move away from the tube blank 4. At this time, the plurality of clamping blocks 30 no longer clamp the insertion block 36, and the output end of the first motor 1 can be disengaged from the working rod 5.

[0094] Further preferably, a connection frame 35 is assembled with the front side of the installation frame 24, and a cover plate 34 is arranged on the extension rod 3, and the cover plate 34 can be assembled with the connection frame 35.

[0095] Such as Figure 8 As shown, after the connection frame 35 is assembled with the installation frame 24, and then the cover plate 34 is assembled with the connection frame 35, the installation frame 24 can form a closed assembly space to prevent the entry of dust and impurities. Moreover, this assembly method can further improve the connection stability between the extension rod 3 and the chuck seat.

[0096] Embodiment 3

[0097] As another preferred embodiment of the present invention, the fracture treatment device includes an installation frame 10, and a first rotating sleeve 12 and a second rotating sleeve 20 which are respectively arranged on the installation frame 10 for limited rotation. A first bevel gear 8 and a second bevel gear 9 are respectively fixedly connected to the opposite ends of the first rotating sleeve 12 and the second rotating sleeve 20. A limiting rod 201 is spline-connected to the inner wall of the installation frame 10 facing the tube blank 4. One end of the limiting rod 201 facing the tube blank 4 is provided with a connecting rod 23. The connecting rod 23 passes through the second rotating sleeve 20 and the through hole opened on the second bevel gear 9 from left to right in turn, and a mounting member 19 is fixed to the other end. The mounting member 19 is arranged in an H-shaped cross-section from the right side view. The upper and lower hollow parts of the H shape of the mounting member 19 are respectively fixed with a mounting sleeve 202 which deflects up and down in turn at the left and right ends with the connection point as the fixed point, that is, when the left end of the mounting sleeve 202 deflects upward with the fixed point as the fulcrum, its right end deflects downward, and when the left end of the mounting sleeve 202 deflects downward, its right end deflects upward. A transmission rod 17 is rotatably mounted on each mounting sleeve 202. A first transmission wheel 181 is arranged at the left side end of each transmission rod 17, and a second transmission wheel 182 is arranged at the right side end. The two first transmission wheels 181 are both meshed and driven with the first bevel gear 8, and the two second transmission wheels 182 are both meshed with the second bevel gear 9. It should be noted that the first bevel gear 8, the second bevel gear 9, the two first transmission wheels 181 and the two second transmission wheels 182 are all provided with corresponding involute tooth profiles. The involute tooth profiles opened above are not drawn in the attached drawings. The involute tooth profiles opened above are used for the first bevel gear 8 to drive the two first transmission wheels 181 to rotate, and then drive the two second transmission wheels 182 coaxial with them to rotate, and finally drive the second bevel gear 9 meshed with the two second transmission wheels 182 to transmit;

[0098] A spline shaft 7 is rotatably mounted on the side wall of the mounting member 19 away from the connecting rod 23, and the spline shaft 7 passes through the spline groove formed in the first bevel gear 8 and is fixed with a tail rod 6 at the end near the tube blank 4. One end of the tail rod 6 away from the spline shaft 7 is fixedly connected to the end of the working rod 5.

[0099] In this embodiment, through the provided fracture treatment device, such as Figures 1 to 6 As shown, through the provided fracture treatment device, first, due to the installation position of the mounting member 19, the limiting rod 201 at its end is spline-connected to the mounting frame 10. The mounting member 19 is limited in the circumferential direction and can be telescopically moved in the horizontal direction, while the spline shaft 7 can rotate relative to the mounting member 19, and the spline shaft 7 is spline-connected to the first rotating sleeve 12 where the first bevel gear 8 is located. When the working rod 5 rotates, under the connection action of the tail rod 6, the rotation of the first bevel gear 8 can be further realized. Since the transmission rod 17 is rotatably arranged relative to the mounting member 19, and transmission wheels 18 are arranged at both ends of the transmission rod 17, and the transmission wheels 18 at both ends are respectively tangent to the conical surfaces of the first bevel gear 8 and the second bevel gear 9. When the working rod 5 drives the first bevel gear 8 to rotate, the transmission wheels 18 where the two transmission rods 17 are located rotate self-driven due to frictional transmission, and then drive the second bevel gear 9 on the other side to rotate. When the working rod 5 operates normally, the rotational speed = , where is the number of teeth of the first bevel gear 8, is the number of teeth of the second bevel gear 9. Since the working rod 5 is connected to the first bevel gear 8 through the tail rod 6 and the spline shaft 7, the rotational speed of the working rod 5 driving the first bevel gear 8 to rotate during the rotation process in each rotor cycle T2 is the same. Therefore, the real-time rotational speed of the first bevel gear 8 in each rotor cycle T2 is also , which is a fixed value. That is, under normal circumstances, the rotational speed of the second bevel gear 9 is . Once the working rod 5 breaks, the first angular velocity sensor monitors that the rotational speed of the second bevel gear 9 is 0.

[0100] The first angular velocity sensor is the first angular velocity sensor 11 arranged on the mounting frame 10. The first angular velocity sensor 11 is sleeved on the outer wall of the second rotating sleeve 20. Through the provided first angular velocity sensor 11, it can be used to detect the rotational speed of the second bevel gear 9 and transmit the signal to the single-chip microcomputer. The single-chip microcomputer receives the signal and further identifies and judges to issue an instruction. While not opening the control detection passage device, the driving device is turned on, and a preliminary pre-alarm can be further carried out. The alarm module can be a warning light.

[0101] Embodiment 4

[0102] As another preferred embodiment of the present invention, the driving device includes a second motor 14 disposed on the mounting frame 10, a second pulley 15 is fixed to the output shaft of the second motor 14, and a first pulley 13 is fixed to the outer wall of the first rotating sleeve 12. A transmission belt 16 is connected between the first pulley 13 and the second pulley 15 for transmission.

[0103] Through the provided driving device, when the single-chip microcomputer receives a signal of 0 transmitted by the first angular velocity sensor 11 that monitors the rotation speed of the second bevel gear 9 in real time, it controls the second motor 14 to start, driving the working rod 5 to rotate within each rotor cycle T2 at the rotation speed before its fracture. Under the transmission action of the second pulley 15, the transmission belt 16 and the first pulley 13, the first rotating sleeve 12 can be further driven to rotate, and then the first bevel gear 8 rotates. At this time, the tail rod 6 where the spline shaft 7 is located is further driven to rotate, thereby realizing the re-rotation of the working rod 5. As a driving device, it provides a power for the working rod 5 after fracture, facilitating the working rod 5 to cooperate with the rolling die to continue to complete the rolling of the tube blank 4, reducing the adverse effects brought about after the fracture of the working rod 5, and at the same time, greatly improving the rolling success rate of the tube blank 4.

[0104] Embodiment 5

[0105] As another preferred embodiment of the present invention, the detection and passing device includes a cross bar 38 disposed at the end of the mounting frame 10, a support block 41 is fixed to the distal end of the cross bar 38, and two groups of second electric telescopic rods 39 are disposed on the machine frame 40. The two groups of second electric telescopic rods 39 are arranged opposite to each other with the axis of the working rod 5 for intermittent clamping and fixing of the support block 41.

[0106] As Figure 3 As shown, when the rotation speed of the second bevel gear monitored by the first angular velocity sensor 11 is in a normal state, the single-chip microcomputer controls the second electric telescopic rod 39 to expand and contract at a set frequency. The expansion and contraction frequency is set according to the length of the tube blank 4, that is, when the formed tube blank 4 completes rolling and approaches the position of the support block 41, the second electric telescopic rod 39 contracts and disengages from the support block 41 to enable the passage of the tube blank 4. After passing, the second electric telescopic rod 39 resets and continues to hold the support block 41. The next tube blank 4 then rolls, and so on in a cycle. When the working rod 5 breaks, the real-time rotation speed signal of the second bevel gear 9 sent by the first angular velocity sensor 11 to the single-chip microcomputer is 0. At this time, the single-chip microcomputer controls the second electric telescopic rod 39 to continue to hold the support block 41 and stop the above intermittent operation. Under the clamping action of the second electric telescopic rod 39, a supporting force can be provided for the mounting frame 10, and at the same time, it can prevent the formed tube blank 4 from passing in this state, facilitating further inspection by subsequent personnel.

[0107] The present invention also provides a cold rolling tube machine mandrel fracture detection method using the device as claimed in the claims, including the following steps:

[0108] 1) The single-chip microcomputer controls the first rolling roll 21 and the second rolling roll 22 to horizontally move along the horizontal direction where the axis of the tube blank 4 is located at a speed in a horizontal sub-cycle T1 in the direction of the rolling outlet. During the horizontal movement, the single-chip microcomputer controls the first rolling roll 21 and the second rolling roll 22 to rotate at the same first angular velocity in opposite directions on the outer wall of the tube blank within a horizontal sub-cycle T1;

[0109] 2) Then the single-chip microcomputer controls the first motor 1 to be turned on, driving the tube blank 4 and the working rod 5 coaxially arranged with it to rotate around its own axis within a rotor sub-cycle T2. A horizontal sub-cycle T1 and a rotor sub-cycle T2 form a rolling sub-cycle;

[0110] 3) The single-chip microcomputer controls to repeat steps 1)-2) N times. After N rolling sub-cycles (that is, after rolling for N×(T1 + T2) time), the rolling of a tube blank 4 is completed, and the rolled tube blank 4 is controlled to be unloaded from the rolling outlet;

[0111] 4) The single-chip microcomputer controls the first rolling roll 21 and the second rolling roll 22 to horizontally move from left to right and return to the initial rolling position on the left;

[0112] 5) During each rolling sub-cycle, when the single-chip microcomputer receives that the fourth angular velocity and the fourth angular velocity sensor are 0, it is determined that the working rod 5 is broken at this time, and the detection passage device is started to prevent the tube blank 4 from passing through to the rolling outlet for unloading. At the same time, the driving device is started to drive the broken part of the working rod 5 connected to the fracture treatment device to continue to rotate at the angular velocity driven by the first motor 1 to complete the rolling of a tube blank 4.

[0113] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0114] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be understood as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations, substitutions and improvements can be made, and these should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the claims.

Claims

1. Cold rolling tube mandrel fracture detection device, including a first rolling roll (21) and a second rolling roll (22) which are arranged on the upper and lower sides of a tube blank (4) to be cold rolled into a cold rolling tube respectively and are in the same vertical plane, and the first rolling roll (21) and the second rolling roll (22) perform periodic reciprocating motion along the horizontal direction where the axis of the tube blank (4) is located, characterized in that, The device further includes: A first angle sensor for real-time monitoring of the real-time angle of the tangent point between the first roll (21) and the second roll (22) and the billet (4) during rotation within a horizontal sub-period T2, a second angle sensor for real-time monitoring of the real-time angle β of the billet (4) and the working rod (5) rotating about their own axes within a rotor sub-period T2, a working rod (5), a first motor (1) for driving the billet (4) and the working rod (5) to rotate about their own axes within a rotor sub-period T2, a chuck seat for limiting and clamping the working rod (5) and the first motor (1), a fracture treatment device, a detection passage device, a driving device, and a single-chip microcomputer for controlling the operation of the device; ​ The fracture treatment device includes a first bevel gear (8) and a second bevel gear (9), and the device further includes a first angular velocity sensor for real-time monitoring of the rotation of the second bevel gear (9). The single-chip microcomputer controls the first rolling roll (21) and the second rolling roll (22) to horizontally move within a horizontal sub-period T1 of each rolling sub-period at an optimal speed, and obtains the third angular velocity of the rotation of the second bevel gear (9) in the fracture treatment device through real-time monitoring to detect whether the working rod (5) is fractured, controls whether the detection passage device obstructs the passage of the billet (4) to the rolling exit for unloading according to the detection result of the fracture treatment device, and controls whether to start the driving device to drive the fractured part of the working rod (5) connected to the fracture treatment device to continue rotating at the angular velocity driven by the first motor (1) within each rolling sub-period ; Rotate; The single-chip microcomputer controls the first roll (21) and the second roll (22) to move horizontally at an optimal speed during a horizontal sub-cycle T1 of each rolling sub-cycle, including the following steps: S1: Calculate the first angular velocity of the first roll (21) and the second roll (22) rotating in real time within a horizontal sub-cycle T1 based on the real-time rotation angle of the tangent point between the first roll (21) or the second roll (22) and the tube blank (4) during the rotation of the first roll (21) or the second roll (22) within a horizontal sub-cycle T1 monitored by the first angle sensor , where the first angular velocity is the real-time rotation of the first roll (21) and the second roll (22) within a horizontal sub-cycle T1 : ； Where θ is the included angle between the inclined outer wall of the conical section of the working rod (5); µ is the real-time included angle between the tangent point of the first roll (21) or the second roll (22) and the tube blank (4) and the horizontal line; S2: Calculate the real-time rotation angle of the tangent point between the first roll (21) or the second roll (22) and the tube blank (4) during the rotation within a horizontal sub-cycle T1 according to the monitoring result of the first angle sensor , and calculate the speeds of the first roll (21) and the second roll (22) in the horizontal direction along the axis of the tube blank (4) : ； Where r is the radius length of the first roll (21) or the second roll (22); S3: According to the result of the step S2, calculate the radius of the circular cross-section of the tube blank (4) at the position of the tangent point between the first roll (21) or the second roll (22) and the tube blank (4) at the moment t after a horizontal sub-period T1. : ； At this time, t1 ≤ t ≤ t2, where T1 is the time slot of a horizontal sub-period from time 1 to time t1, and T2 is the time slot of a rotary sub-period from time t1 to time t2. is the outer radius of the circular cross-section of the billet (4) at the initial rolling position; 560 mm ≤ ≤ 590 mm, and the outer radius of the circular cross-section of the cold-rolled tube, which is the rolled product obtained after N rolling sub-periods, is , 505 mm ≤ ≤ 530 mm; S4: According to the real-time angle β obtained by real-time monitoring of the billet (4) and the working rod (5) rotating around their own axes within a rotor cycle T2 by the second angle sensor, calculate the second angular velocity of the working rod (5) being driven by the first motor (1) to rotate in real time : ； Among them, is the angle between the tangent point of the first roll (21) or the second roll (22) and the tube blank (4) and the horizontal line after passing through a horizontal sub-period T1, , l is the gap distance of the annular gap formed between the inner surface of the tube blank (4) and the outer surface of the working rod (5); S5: Calculate the arc length A of the arc path passed by the rotation of the tube blank (4) within a rotor cycle T2: ； S6: Construct the optimal speed within a rolling sub-cycle Calculation model: ； Wherein, S is the area formed by multiplying the length moved within a horizontal sub-period T1 by the arc length A rotated within a rotary sub-period T2; is the radius of the circular cross-section of the working rod (5) in the vertical direction at the position of the billet tangent point of the first rolling roll (21) or the second rolling roll (22) at time t after a horizontal sub-period T1, , is the radius of the circular cross-section of the working rod (5) at the initial rolling position, 450 mm ≤ ≤ 470 mm; is the wall thickness reduction of the billet (4) after a rolling cycle; 0.5 mm 1.5 mm; In the formula for calculating the speed of the first roll (21) and the second roll (22) in the horizontal direction of the axis of the tube blank (4) in the step S2 is as follows: ； ； Therefore, according to the calculation result of , is obtained by reverse calculation; The fracture treatment device includes a mounting frame (10), and a first rotating sleeve (12) and a second rotating sleeve (20) which are respectively arranged on the mounting frame (10) for limited rotation. The first bevel gear (8) and the second bevel gear (9) are respectively fixedly connected to the opposite ends of the first rotating sleeve (12) and the second rotating sleeve (20). A limiting rod (201) is spline-connected to the inner wall of the mounting frame (10) facing the direction of the tube blank (4). One end of the limiting rod (201) facing the direction of the tube blank (4) is provided with a connecting rod (23). The connecting rod (23) sequentially passes through the second rotating sleeve (20) and the through hole opened on the second bevel gear (9) from left to right and is fixed with a mounting member (19) at the other end. The mounting member (19) is arranged in an H-shaped cross-section from the right side view. The upper and lower hollow parts of the H shape of the mounting member (19) are respectively fixed with a mounting sleeve (202) which deflects up and down in sequence at the left and right ends with the connection point as the fixed point. A transmission rod (17) is rotatably mounted on each mounting sleeve (202). A first transmission wheel (181) is arranged at the left end of each transmission rod (17), and a second transmission wheel (182) is arranged at the right end. Both of the two first transmission wheels (181) are in meshing transmission with the first bevel gear (8), and both of the two second transmission wheels (182) are in meshing with the second bevel gear (9); A spline shaft (7) is rotatably mounted on the side wall of the mounting member (19) away from the connecting rod (23), and the spline shaft (7) passes through the spline groove opened on the first bevel gear (8) and is fixed with a tail rod (6) at one end close to the tube blank (4). One end of the tail rod (6) away from the spline shaft (7) is fixedly connected to the end of the working rod (5); Through the provided fracture treatment device, first, due to the installation position setting of the installation part (19), the limit rod (201) at its end is spline-connected to the mounting frame (10). The installation part (19) is limited in the circumferential direction and can be telescopically moved in the horizontal direction. The spline shaft (7) can rotate relative to the installation part (19), and the spline shaft is spline-connected to the first rotating sleeve (12) where the first bevel gear (8) is located. When the working rod (5) rotates, under the connection action of the tail rod (6), the rotation of the first bevel gear (8) can be further realized. Since the transmission rod (17) is rotationally arranged relative to the installation part (19), and transmission wheels (18) are provided at both ends of the transmission rod (17), and the transmission wheels (18) at both ends are respectively tangent to the conical surfaces of the first bevel gear (8) and the second bevel gear (9). When the working rod (5) drives the first bevel gear (8) to rotate, the transmission wheels (18) where the two side transmission rods (17) are located rotate self-driven due to frictional transmission, thereby driving the second bevel gear (9) on the other side to rotate.

2. The mandrel fracture detection device for cold rolling tube machine according to claim 1, characterized in that, The chuck base includes an installation frame (24) provided at the right end of the first motor (1). Installation grooves are respectively formed in the four circumferences inside the installation frame (24), and a transmission block (25) is connected to each installation groove on each side of the installation frame (24). A first electric telescopic rod (28) is provided on the vertical inner wall at the front side of the installation frame (24) for moving the first transmission block (25) at the bottom of the installation frame (24) to the rear side of the device. An inclined surface (29) is provided between the ends of the three adjacent transmission blocks (25) in the two vertical side walls and the horizontal side wall inside the installation frame (24). A fixing block (37) is provided at the end of the installation frame (24), and a spring (27) is provided between the upper part of the fixing block (37) and the bottom end of the last transmission block (25) on the inner wall at the front part of the installation frame (24). The chuck base further includes a connecting block (32) extending in the direction of approaching the axis of the tube blank (4) on each transmission block (25). Each connecting block (32) is synchronously moved closer to or away from the axis of the tube blank (4) and is limited to slide through the through groove (26) formed in the installation frame (24). A clamping block (30) is fixed to each connecting block (32) in the direction of approaching the axis of the tube blank (4). The chuck base further includes an insertion block (36) that is limited and clamped with the four clamping blocks (30). The outer wall of the insertion block (36) is evenly distributed with involute tooth profiles. The end of the insertion block (36) far from the first motor (1) is fixedly connected with an extension rod (3). The output end of the first motor (1) passes through the insertion block (36) and is fixedly connected with the extension rod (3); a working rod (5) is fixed to the end of the extension rod (3) far from the first motor (1); when the clamping blocks (30) gather, it can be used for clamping and engaging the insertion block (36).

3. The mandrel fracture detection device for a cold rolling tube machine according to claim 2, characterized in that, On the inner side of each of the clamping blocks (30), there is an arc-shaped portion that changes from high to low counterclockwise when viewed from the right side, the concave direction of the arc-shaped portion faces the position where the axis of the tube blank (4) is located, and teeth (31) that fit the concave portions of the involute tooth profile of the inserting block (36) are distributed on each arc-shaped portion.

4. The mandrel fracture detection device for cold rolling tube mill according to claim 3, wherein, A connecting frame (35) assembled with the front side of the installation frame (24), a cover plate (34) arranged on the extension rod (3), and the cover plate (34) can be assembled with the connecting frame (35).

5. The mandrel fracture detection device for cold rolling tube machines according to claim 1, characterized in that The driving device includes a second motor (14) arranged on the mounting frame (10), a second pulley (15) fixed to the output shaft of the second motor (14), and a first pulley (13) fixed to the outer wall of the first rotating sleeve (12), and a transmission belt (16) is connected in transmission between the first pulley (13) and the second pulley (15).

6. The cold rolling tube mandrel fracture detection device according to claim 1, characterized in that, The detection and passage device includes a cross bar (38) arranged at the end of the mounting frame (10), a support block (41) fixed to the distal end of the cross bar (38), and two groups of second electric telescopic rods (39) arranged on the machine frame (40), and the two groups of second electric telescopic rods (39) are arranged opposite to each other with the axis of the working rod (5) as the center, and are used for intermittently clamping and fixing the support block (41).

7. A cold rolling tube mandrel fracture detection method using the device according to any one of claims 1-6, characterized in that, Including the following steps: 1) The single-chip microcomputer controls the first roll (21) and the second roll (22) to horizontally move in the horizontal direction where the axis of the tube blank (4) is located at a speed to horizontally move in the rolling exit direction within a horizontal sub-cycle T1. During the horizontal movement, the single-chip microcomputer controls the first roll (21) and the second roll (22) to rotate in opposite directions on the outer wall of the tube blank at the same first angular velocity within a horizontal sub-cycle T1. 2) Then the single-chip microcomputer controls the first motor (1) to start, driving the tube blank (4) and the working rod (5) coaxially arranged with it to rotate around its own axis within a rotor cycle T2, and one horizontal sub-cycle T1 and one rotor cycle T2 form a rolling sub-cycle; 3) The single-chip microcomputer controls to repeat the steps 1)-2) N times. After N rolling sub-cycles, the rolling of one tube blank (4) is completed, and the rolled tube blank (4) is controlled to be unloaded from the rolling outlet; 4) The single-chip microcomputer controls the first rolling roll (21) and the second rolling roll (22) to move horizontally from left to right and return to the initial rolling position on the left side; 5) During each rolling sub-cycle, when the single-chip microcomputer receives that the fourth angular velocity and the fourth angular velocity sensor are 0, it is determined that the working rod (5) is broken at this time, and the detection and passing device is started to prevent the billet (4) from passing through to the rolling outlet and being unloaded. At the same time, the driving device is started to drive the part of the working rod (5) that has been broken and is connected to the fracture treatment device to continue rotating at the angular velocity driven by the first motor (1). Rotate to complete the rolling of one billet (4).

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