A hydraulically driven tension self-balancing looper mechanism and tension self-balancing method thereof

Abstract

The present invention provides a hydraulically driven tension self-balancing looper mechanism and a tension self-balancing method thereof, which overcomes the tension instability phenomenon existing in the looper mechanism that drives the floating roller group to move through the feedback signal of the tension sensor and an external mechanical motion mechanism, improves the tension stability of the production line during the filling, releasing and normal operation of the looper, and effectively reduces the deformation, wrinkling, deviation and even breakage of the substrate caused by the unstable tension. The frame is installed and fixed on the fixed platform; the floating platform is located above the fixed platform, and the floating platform is lifted and set on the frame; the fixed roller group is installed on the fixed platform; the floating roller group is installed on the floating platform; the inlet guide roller and the outlet guide roller are both installed on the frame; the inlet drive device is arranged next to the inlet of the frame, and the outlet drive device is arranged next to the outlet of the frame; the oil cylinder is installed on the fixed platform, and the piston rod of the oil cylinder is connected to the floating platform; the hydraulic system is connected to the oil cylinder.

Description

Technical Field

[0001] The invention relates to a hydraulically driven tension self-balancing looper mechanism and a tension self-balancing method thereof, which are suitable for production lines for continuous surface treatment, continuous physical treatment, continuous chemical treatment and the like of foils, plates and strips whose substrates are coils. Background Art

[0002] There are many production lines for surface treatment of coil substrates, such as preparation of positive and negative electrode materials for lithium batteries, color coating of steel plates, galvanizing of steel plates, electrochemical aluminum foil, coil printing, floor leather coating, etc. Similarly, there are many production lines for physical treatment of coil substrates, such as straightening and shaping, trimming, longitudinal shearing and slitting, ultrasonic cleaning, rewinding, hot drying, etc. There are also production lines for continuous chemical treatment of coils, such as pickling, oxidation, phosphating, passivation, chemical plating, etc. The above types of production lines have the following commonalities: 1. The substrate to be treated is a coil; 2. The process of treating the coil substrate is continuous; 3. The production process is close to constant tension. Because the length of the coil is limited, when a coil is unwound in the unwinding section, operations such as rewinding and overlapping must be performed. This process requires partial shutdown to stop the operation of the coil substrate in this section; similarly, when a coil is full in the rewinding section, it is also necessary to stop the reeling operation locally; there are also production lines where the coil substrate is in a continuous state and a stepping state at the same time in different process sections. However, the shutdown of a local section cannot affect the continuous operation of the coil substrate in the front and rear sections. Therefore, in order to achieve local shutdown or step-by-step operation in a production line where the coil substrate is continuously running, a looper mechanism with a material storage function must be set up to ensure the continuous operation of the coil substrate in the process section that needs continuous processing during local shutdown and maintain the tension of the system. Usually there are loopers at the unwinding end, loopers at the winding end, and loopers at the middle section, as shown in the Chinese patent No. CN201320486045.5.

[0003] The existing looping mechanism is a mechanically driven floating platform that changes the distance between the floating roller group and the fixed roller group, thereby achieving the filling and unfilling of the coil substrate. Its control principle is based on the feedback of the tension sensor and the corresponding movement of the floating platform mechanical drive mechanism. It is essentially a system with external mechanical movement: according to the signal of the tension sensor, by rigidly applying rigid movement to the coil substrate, the tension balance of the coil substrate in the looping mechanism and the front and rear sections of the looping mechanism is constructed. In fact, it is an external force system. Due to the properties of its external force system, the following problems are bound to exist:

[0004] 1. During the process of releasing and filling the sleeve, the instantaneous movement between the floating platform drive unit and the looper mechanism entrance drive unit and the looper mechanism exit drive unit is not synchronized, which inevitably causes impact on the operation of the coil substrate and makes the system tension unstable;

[0005] 2. The mechanical system that drives the floating platform has certain motion instability during the start and stop phases, and its motion is rigid, which will cause instability in the system tension;

[0006] 3. Since the mechanical action of the floating platform drive unit for tension adjustment is based on the feedback signal of the tension sensor, there will inevitably be a hysteresis in the action response, resulting in under-adjustment or over-adjustment, which will affect the stability of the tension;

[0007] Unstable tension is harmful to the production of the production line. It will make the front and back process of the coil substrate unstable, causing process defects (coating thickness deviation, uniformity deviation, etc.), and will also cause deformation, wrinkling, and deviation of the material, affecting product quality. In severe cases, it may even break the coil substrate, causing the product to be scrapped and the production line to stop. This serious consequence is more likely to occur for coil substrates made of foil or materials with low tensile strength. Summary of the invention

[0008] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a reasonably designed hydraulically driven tension self-balancing looper mechanism and a tension self-balancing method thereof, which overcomes the tension instability phenomenon existing in the looper mechanism that drives the movement of the floating roller group through the feedback signal of the tension sensor and an external mechanical motion mechanism, improves the tension stability of the production line during filling, releasing and normal operation, improves product quality, and effectively reduces the deformation, wrinkling, deviation and even breakage of the substrate caused by unstable tension.

[0009] The technical solution adopted by the present invention to solve the above problems is: a hydraulically driven tension self-balancing looper mechanism, comprising an inlet drive device, a frame, an inlet guide roller, a fixed roller group, a floating roller group, a floating platform, a fixed platform, an outlet guide roller, and an outlet drive device; the frame is installed and fixed on the fixed platform, and an inlet and an outlet are arranged on the frame; the floating platform is located above the fixed platform, and the floating platform is lifted and arranged on the frame; the fixed roller group is installed on the fixed platform; the floating roller group is installed on the floating platform; the inlet guide roller and the outlet guide roller are both rotatably installed on the frame, the inlet guide roller is located at the inlet of the frame, and the outlet guide roller is located at the outlet of the frame; the inlet drive device is arranged next to the inlet of the frame, and the outlet drive device is arranged next to the outlet of the frame;

[0010] The invention is characterized in that: it also includes an oil cylinder and a hydraulic system; the oil cylinder is installed on the fixed platform, and the piston rod of the oil cylinder is connected to the floating platform; the hydraulic system includes a low-level oil tank, a high-level oil tank, a first oil chamber oil inlet pipeline, a first oil chamber overflow pipeline, a first oil chamber oil port pipeline, a second oil chamber oil port pipeline, a high-level oil tank oil replenishment pipeline and an unloading pipeline; one end of the first oil chamber oil inlet pipeline is connected to the low-level oil tank, and the other end is connected to the first oil chamber oil port pipeline; a variable pump, a first two-position two-way valve, a speed regulating valve, a first check valve and an accumulator are sequentially arranged on the first oil chamber oil inlet pipeline along the oil circuit direction; one end of the first oil chamber overflow pipeline is connected to the first oil chamber oil port pipeline, and the other end is connected to the low-level oil tank, and the second two-way valve, a speed regulating valve, a first check valve and an accumulator are sequentially arranged along the oil circuit direction two-way valve, throttle valve and back-pressure valve; the first oil chamber oil port pipeline is connected to the first oil chamber of the oil cylinder; one end of the second oil chamber oil port pipeline is connected to the second oil chamber of the oil cylinder, and the other end is connected to the high-level oil tank, and a filter and a second one-way valve are arranged in parallel on the oil circuit; one end of the high-level oil tank oil supply pipeline is connected to the first oil chamber oil inlet pipeline, and the connection point is between the variable pump and the first two-position two-way valve, and the other end of the high-level oil tank oil supply pipeline is connected to the high-level oil tank; a third two-position two-way valve is arranged on the high-level oil tank oil supply pipeline; one end of the unloading pipeline is connected to the first oil chamber oil inlet pipeline, and the connection point is between the variable pump and the first two-position two-way valve, and the other end of the unloading pipeline is connected to the low-level oil tank, and a fourth two-position two-way valve is arranged on the unloading pipeline.

[0011] The hydraulic system described in the present invention also includes a system overflow pipeline, one end of which is connected to the first oil chamber oil inlet pipeline, the connection point is set between the variable pump and the first two-position two-way valve, and the other end of the system overflow pipeline is connected to the low-level oil tank; an overflow valve is provided on the system overflow pipeline.

[0012] The frame of the present invention comprises a steel structure frame and a guide rail, wherein the guide rail is installed on the steel structure frame perpendicular to the fixed platform; and the floating platform is movably connected to the guide rail.

[0013] The oil cylinder of the present invention is provided with a displacement sensor.

[0014] The invention also comprises a travel switch which is fixedly mounted on the frame and located at the upper limit position of the floating platform.

[0015] The first oil chamber oil inlet pipeline of the present invention is provided with a pressure sensor.

[0016] A tension self-balancing method for a hydraulically driven tension self-balancing looper mechanism, characterized in that it includes the following processes:

[0017] Assume: the entry point of the entry drive device is point A, the exit point of the exit drive device is point B; the driving force applied by the entry drive device on the coil substrate along the traveling direction is F A , so that its velocity is v AThe force applied by the outlet drive device to the coil substrate along the travel direction is F B , so that its velocity is v B The tangent point between the coil substrate and the inlet guide roller is point C, and the tangent point between the coil substrate and the outlet guide roller is point D; the combined force of the gravity of the floating roller group and the floating platform is W, and the upward thrust of the piston rod of the hydraulic system driving the oil cylinder on the floating platform is F 缸 ; The upward thrust of the accumulator on the floating platform is F 蓄 ; The downward pulling force exerted by the oil in the high-level oil tank on the piston rod of the oil cylinder is F 液 ; The resistance of the throttle valve to prevent the floating platform from moving downward is F 节 ; The resistance of the speed regulating valve is F 调 ;

[0018] 1. Normal operation state: The floating platform is at the upper limit position, the electromagnets of the second two-position two-way valve and the first two-position two-way valve are not energized, the overflow pipeline of the first oil chamber is disconnected; the oil inlet pipeline of the first oil chamber is disconnected from the pressure oil provided by the variable pump, the electromagnet of the fourth two-position two-way valve is energized, the unloading pipeline is connected, and the variable pump is unloaded; at this time, the accumulator is in the pressure-maintaining state, and the tension F in the looper mechanism = F B +W+F 液 -F 蓄 -F A ; When the accumulator acts on the floating platform, the upward thrust F 蓄 = W+F 液 When , the tension in the loop mechanism is in a stable state;

[0019] Because v A 、v B The fluctuation of F B 、F A The change of the tension F will cause the floating platform to move slightly upward or downward. The accumulator absorbs the tension fluctuation caused by the downward movement of the floating platform. 液 To absorb the tension fluctuation caused by the upward movement of the floating platform and balance the tension;

[0020] The up and down fluctuations of the floating platform are absorbed by the oil resistance of the accumulator and the high-level oil tank, which is carried out within a small stroke range. When the fluctuation range of the floating platform exceeds the set range, it is necessary to adjust the operating speed of the inlet drive device to balance the tension:

[0021] When the floating platform moves downward beyond the set value, the entrance drive device increases speed until the floating platform returns to the set area to achieve tension balance;

[0022] When the floating platform moves upwards beyond the set value, the entrance drive device slows down until the floating platform returns to the set area to achieve tension balance;

[0023] 2. Release process: The inlet drive device is braked, so that no more coil substrate enters point A. At the same time, the electromagnet of the second two-position two-way valve is energized, so that the throttle valve and back pressure valve on the overflow pipeline of the first oil chamber are connected with the oil port pipeline of the first oil chamber;

[0024] At this time v A =0,F A = 0, no more coil substrate enters point A, and the coil substrate at point B is still v B The speed of the flow is F B Conducting on the BA section of the coil substrate, the floating platform moves downward, which will shorten the length of the coil substrate between points CD and achieve the release; F B The floating platform moves downward, and the oil pressure in the first oil chamber of the oil cylinder rises to reach the set pressure of the back pressure valve. The back pressure valve opens, and the oil in the first oil chamber of the oil cylinder returns to the low-level oil tank through the overflow pipeline of the first oil chamber. At the same time, the oil in the high-level oil tank replenishes oil to the second oil chamber of the oil cylinder under the pressure difference formed by the liquid level difference.

[0025] At this time, the tension inside the looper mechanism is F = F B +W+F 液 -F 蓄 -F 节 ; As long as the throttle valve oil resistance is adjusted, F 节 =F A , the tension in the loop mechanism can be kept in a stable state;

[0026] When the floating platform moves downward, the oil pressure in the first oil chamber of the oil cylinder rises. Before reaching the set pressure of the back pressure valve, the pressure oil discharged from the first oil chamber replenishes the oil in the accumulator to reach the set pressure of the back pressure valve. The back pressure valve opens, and the pressure oil in the accumulator produces damping to prevent the floating platform from moving downward. In this state, the tension fluctuation of the looper mechanism is eliminated and absorbed by the damping of the accumulator, the damping of the throttle valve, and the on-off of the back pressure valve.

[0027] 3. Filling process: The inlet drive device starts the high-speed operation state and slowly slows down to the speed of the normal operation state to achieve filling;

[0028] Start filling: The entrance drive device starts the high-speed operation state, so that the coil substrate at point A obtains v A1 The speed, v A1 Higher than the normal running speed v A , while the coil substrate at point B is still v BThe oil flows out at a speed of ; the electromagnet of the first two-position two-way valve is energized to connect the oil inlet pipeline of the first oil chamber, the electromagnet of the second two-position two-way valve is de-energized to disconnect the overflow pipeline of the first oil chamber, the electromagnet of the fourth two-position two-way valve is de-energized to disconnect the unloading pipeline, and the variable pump provides pressure oil to the first oil chamber of the oil cylinder, pushing the piston rod to move upward, driving the floating platform to move upward, and establishing tension on the coil substrate between the CDs;

[0029] When the floating platform reaches the upper limit, the electromagnet of the first two-position two-way valve loses power, disconnecting the oil inlet line of the first oil chamber from the pressure oil provided by the variable pump. At the same time, the electromagnet of the fourth two-position two-way valve is energized, connecting the unloading line and unloading the variable pump, thus completing the filling process and the loose sleeve mechanism enters the normal operating state of neither releasing nor filling the sleeve.

[0030] The present invention provides a pressure sensor on the oil inlet pipeline of the first oil chamber. During the filling process: if the pressure does not reach the set value of the pressure sensor, the inlet drive device will slow down until the pressure reaches the set value of the pressure sensor; if the system pressure exceeds the set value of the pressure sensor, the inlet drive device will speed up until the pressure reaches the set value of the pressure sensor.

[0031] The present invention also includes a process of replenishing oil to the high-level oil tank: in a normal operating state or a sleeve-released state: the electromagnet of the third two-position two-way valve is energized, the high-level oil tank oil replenishment pipeline is connected, and the variable pump replenishes oil to the high-level oil tank; when the loop mechanism is in a sleeve-filling state, it waits to switch to a normal operating state or a sleeve-released state, and then connects the high-level oil tank oil replenishment pipeline.

[0032] Compared with the prior art, the present invention has the following advantages and effects: as a material storage loop mechanism, it is suitable for production lines such as continuous surface treatment, continuous physical treatment, continuous chemical treatment, etc. of foils, plates, and strips whose substrates are coils, and can be used as an unwinding loop, an intermediate loop, and a winding loop. It overcomes the tension instability phenomenon existing in the loop that drives the floating roller group to move through the feedback signal of the tension sensor and an external mechanical motion mechanism, improves the tension stability of the production line during filling, unwinding and normal operation, improves product quality, and effectively reduces the deformation, wrinkling, deviation and even breakage of the substrate caused by unstable tension. It has a high degree of automation and is simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0034] Figure 2 Schematic diagram of the structure of the hydraulic system according to the embodiment of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0036] The coil substrate looper described in the embodiment of the present invention includes an inlet drive device 1, a frame 2, an inlet guide roller 3, a fixed roller group 4, a floating roller group 5, a floating platform 7, a cylinder 8, a fixed platform 9, an outlet guide roller 10, an outlet drive device 11, a hydraulic system 12, a travel switch 13 and an electronic control system 14.

[0037] The rack 2 is mounted and fixed on the fixed platform 9. The rack 2 includes a steel structure frame 21 and guide rails 22. There are four guide rails 22, which are mounted on the steel structure frame 21 perpendicular to the fixed platform 9. The right side of the rack 2 is set as an entrance, and the left side of the rack 2 is set as an exit.

[0038] The oil cylinder 8 is vertically mounted upward on the fixed platform 9 , and a displacement sensor is provided on the oil cylinder 8 for detecting the displacement of the piston rod of the oil cylinder 8 .

[0039] The floating platform 7 is located above the fixed platform 9, is arranged parallel to the fixed platform 9, and is movably connected to the guide rail 22, so that the floating platform 7 is lifted and lowered on the frame 2. The piston rod of the oil cylinder 8 is connected to the floating platform 7 to drive the floating platform 7 to rise and fall.

[0040] The fixed roller group 4 is installed on the fixed platform 9 ; the floating roller group 5 is installed on the floating platform 7 .

[0041] The inlet guide roller 3 and the outlet guide roller 10 are both rotatably mounted on the frame 2 , the inlet guide roller 3 is located at the inlet of the frame 2 , and the outlet guide roller 10 is located at the outlet of the frame 2 .

[0042] The inlet drive device 1 is arranged beside the inlet of the frame 2 , and the outlet drive device 11 is arranged beside the outlet of the frame 2 .

[0043] The travel switch 13 is fixedly mounted on the frame 2 , located at the upper limit position of the floating platform 7 , and cooperates with the floating platform 7 .

[0044] In this embodiment, the axis of the fixed roller group 4, the axis of the floating roller group 5, the axis of the inlet guide roller 3, the axis of the outlet guide roller 10, the axis of the inlet drive device 1, and the axis of the outlet drive device 11 are all parallel to each other.

[0045] The coiled substrate 6 of this embodiment continuously passes through the inlet drive device 1, the inlet guide roller 3, the fixed roller group 4, the floating roller group 5, the outlet guide roller 10, and the outlet drive device 11.

[0046] All the electric control components and electric drive components of this embodiment are electrically connected to the electric control system 14 .

[0047] The hydraulic system 12 of this embodiment includes a low-level oil tank 121, a first oil chamber oil inlet pipeline 122, a first oil chamber overflow pipeline 123, a first oil chamber oil outlet pipeline 124, a second oil chamber oil outlet pipeline 125, a high-level oil tank 126, a system overflow pipeline 127, a high-level oil tank oil replenishment pipeline 128 and an unloading pipeline 129.

[0048] One end of the first oil chamber oil inlet pipeline 122 is connected to the low-position oil tank 121, and the other end is connected to the first oil chamber oil port pipeline 124. The first oil chamber oil inlet pipeline 122 is provided with a variable pump 1222, a first two-position two-way valve 1223, a speed regulating valve 1224, a first non-return valve 1225, a pressure sensor 1226 and an accumulator 1227 in sequence along the oil circuit direction. The variable pump 1222 is connected to the motor 1221 to obtain power, and the pressure sensor 1226 is connected to the electronic control system 14 to feed back the oil circuit pressure to the electronic control system 14. The variable pump 1222 is a pressure-limited constant power variable pump.

[0049] One end of the first oil chamber overflow pipeline 123 is connected to the first oil chamber oil port pipeline 124, and the other end is connected to the low-level oil tank 121. A second two-position two-way valve 1231, a throttle valve 1232, and a back pressure valve 1233 are sequentially arranged along the oil circuit direction.

[0050] The first oil chamber oil port pipeline 124 is connected to the first oil chamber of the oil cylinder 8 .

[0051] One end of the second oil chamber oil port pipeline 125 is connected to the second oil chamber of the oil cylinder 8, and the other end is connected to the high-position oil tank 126. A filter 1251 and a second check valve 1252 are arranged in parallel on the oil circuit. When the piston rod of the oil cylinder 8 moves upward, the oil in the second oil chamber of the oil cylinder 8 passes through the second oil chamber oil port pipeline 125 and returns to the high-position oil tank 126 via the second check valve 1252; when the piston rod of the oil cylinder 8 moves downward, the oil in the high-position oil tank 126 passes through the second oil chamber oil port pipeline 125 and passes through the filter 1251 to replenish the second oil chamber of the oil cylinder 8.

[0052] The high-level oil tank 126 is provided with an air filter 1262, an oil drain valve 1263, and a liquid level gauge 1264. The liquid level gauge 1264 is installed at the lower limit of the liquid level of the high-level oil tank 126. The lowest liquid level of the high-level oil tank 126 is always higher than the oil port of the second oil chamber of the oil cylinder 8. In addition, the high-level oil tank 126 is a large-volume oil tank to avoid large-scale fluctuations in system pressure caused by changes in the liquid level of the high-level oil tank 126 during the process of filling and releasing the loop mechanism. The oil in the high-level oil tank 126 can be discharged when needed by opening the oil drain valve 1263. The liquid level gauge 1264 is a liquid level control type liquid level gauge.

[0053] One end of the system overflow pipeline 127 is connected to the first oil chamber oil inlet pipeline 122, and the connection point is set between the oil outlet of the variable pump 1222 and the oil inlet of the first two-position two-way valve 1223. The other end of the system overflow pipeline 127 is connected to the low-level oil tank 121; an overflow valve 1271 is provided on the oil circuit of the system overflow pipeline 127 to limit the system pressure to protect the system.

[0054] One end of the high-level oil tank oil replenishing pipeline 128 is connected to the first oil chamber oil inlet pipeline 122, and the connection point is between the oil outlet of the variable pump 1222 and the oil inlet of the first two-position two-way valve 1223. The other end of the high-level oil tank oil replenishing pipeline 128 is connected to the high-level oil tank 126; a third two-position two-way valve 1281 is provided on the oil circuit of the high-level oil tank oil replenishing pipeline 128. When the liquid level meter 1264 alarms at a low level, the electronic control system 14 will timely connect the third two-position two-way valve 1281, and the variable pump 1222 replenishes oil to the high-level oil tank 126.

[0055] One end of the unloading pipeline 129 is connected to the first oil chamber oil inlet pipeline 122, and the connection point is between the oil outlet of the variable pump 1222 and the oil inlet of the first two-position two-way valve 1223. The other end of the unloading pipeline 129 is connected to the low-level oil tank 121, and a fourth two-position two-way valve 1291 is provided on the oil circuit of the unloading pipeline 129.

[0056] A tension self-balancing method for a hydraulically driven tension self-balancing looper mechanism includes the following steps:

[0057] The coil substrate 6 enters from the entry point A of the entry drive device 1 and leaves from the exit point B of the exit drive device 11. The driving force applied by the entry drive device 1 to the coil substrate 6 along the travel direction is F. A , so that its velocity is v A The force applied by the outlet drive device 11 to the coil substrate 6 along the travel direction is F B , so that its velocity is v B The tangent point between the coil substrate 6 and the entrance guide roller 3 is point C, and the tangent point between the coil substrate 6 and the exit guide roller 10 is point D. The looping mechanism changes the length of the coil substrate 6 between CD through the up and down movement of the floating platform 7, thereby realizing the filling and releasing functions of the looping mechanism.

[0058] When there is no intermediate mechanism (i.e., the tension system has no other components), the tension of the system is generated by the speed difference. A <v B When F A <F B , a tension is formed (build tension) on the coil substrate 6 between points A and B, and the tension F = F B -F A ; When v A>v B When the tension of the coil substrate 6 between points A and B is lost, the coil substrate 6 is in a relaxed state.

[0059] In the tension system constructed in this embodiment, the combined force W of the gravity of the floating roller group 5 and the floating platform 7 is introduced into the AB section of the coil substrate 6, and the hydraulic system 12 drives the piston rod of the oil cylinder 8 to act on the floating platform 7. 缸 ; The upward thrust F of the accumulator 1227 acting on the floating platform 7 蓄 ; The downward pulling force F exerted by the oil in the high oil tank 126 on the piston rod 液 , the resistance F of the throttle valve 1232 to prevent the floating platform 7 from moving downward 节 , the resistance F of the speed regulating valve 1224 调 Under different working conditions of the loop mechanism, the electric control system 14 cuts off or conducts different pipelines, which determines the effects of the above-mentioned forces in the tension system.

[0060] 1. Normal operation state (neither releasing nor filling): At this time, the floating platform 7 is at the upper limit, the loop mechanism is in the full loop state, the electromagnets of the second two-position two-way valve 1231 and the first two-position two-way valve 1223 are not energized, the first oil chamber overflow pipeline 123 is disconnected; the first oil chamber oil inlet pipeline 122 is disconnected from the pressure oil provided by the variable pump 1222, the electromagnet of the fourth two-position two-way valve 1291 is energized, the unloading pipeline 129 is connected, and the variable pump 1222 is unloaded. At this time, the system is in the pressure-maintaining state of the accumulator 1227, and the tension in the loop mechanism (the force acting on the floating platform 7) F = F B +W+F 液 -F 蓄 -F A ;

[0061] As long as the accumulator 1227 is selected so that it acts on the floating platform 7, the upward thrust F 蓄 = W+F 液 , the tension in the loop mechanism (the tension between points A and B) F = F B -F A In stable state.

[0062] In the system, due to v A 、v B The fluctuation of F B , F A The change of the tension F and the resulting fluctuation of the tension F will cause the floating platform 7 to produce a slight upward or downward movement. The system absorbs the tension fluctuation caused by the downward movement of the floating platform 7 by the accumulator 1227; the oil resistance F of the oil in the high-level oil tank 126 液To absorb the tension fluctuation caused by the upward movement of the floating platform 7 and balance the tension. This balancing process is automatically achieved through the pressure state of the accumulator 1227 and the height difference between the liquid level of the high-level oil tank 126 and the oil port of the second oil chamber of the oil cylinder 8. This is completely different from the looper mechanism that relies on the feedback signal of the tension sensor and the external mechanical movement to drive the movement of the floating platform.

[0063] The oil resistance of the oil in the accumulator 1227 and the high-level oil tank 126 absorbs the up and down fluctuations of the floating platform 7 within a relatively small stroke range. When the displacement sensor shows that the fluctuation range of the floating platform 7 exceeds the set interval, the operating speed of the inlet drive device 1 needs to be adjusted to balance the tension:

[0064] When the floating platform 7 moves downward beyond the set value, the electric control system 14 causes the inlet drive device 1 to slowly increase speed until the position of the floating platform 7 returns to the set area, achieving tension balance;

[0065] When the floating platform 7 moves upward and exceeds the set value, the electric control system 14 causes the inlet drive device 1 to slowly decelerate until the position of the floating platform 7 returns to the set area, thereby achieving tension balance.

[0066] 2. Release process: The release process is under normal operation state, and the release button is manually pressed to enter the release state. The release is started: the inlet drive device 1 is braked so that no more coil substrate 6 enters point A. At the same time, the electromagnet of the second two-position two-way valve 1231 is energized, so that the throttle valve 1232 and the back pressure valve 1233 on the first oil chamber overflow pipeline 123 are connected to the first oil chamber oil port pipeline 124.

[0067] At this time v A =0,F A = 0, no more coil substrate enters point A, and the coil substrate at point B is still v B The driving force F is applied to the coil substrate at point B. B The conduction on the BA section of the coil substrate causes the floating platform 7 to move downward, which shortens the length of the coil substrate 6 between CD and achieves the nesting.

[0068] F B As a result, the floating platform 7 moves downward, the oil pressure in the first oil chamber of the oil cylinder 8 rises, reaching the set pressure of the back pressure valve 1233, and the back pressure valve 1233 opens. The oil in the first oil chamber of the oil cylinder 8 returns to the low-level oil tank 121 through the first oil chamber overflow pipeline 123. At the same time, the oil in the high-level oil tank 126 replenishes the second oil chamber of the oil cylinder 8 under the action of the pressure difference formed by the liquid level difference.

[0069] At this time, the tension in the loop mechanism (the force acting on the floating platform 7) is:

[0070] F = FB +W+F 液 -F 蓄 -F 节 ;

[0071] Compared with the forces on the floating platform 7 in the normal operation state, the first four items on the right side of the equation are the same. As long as the throttle valve oil resistance is adjusted, F 节 =F A , the tension in the loop mechanism can be kept in a stable state.

[0072] When the floating platform 7 moves downward, the oil pressure in the first oil chamber of the oil cylinder 8 rises. Before reaching the set pressure of the back pressure valve 1233, the pressure oil discharged from the first oil chamber replenishes the accumulator 1227 to reach the set pressure of the back pressure valve 1233. The back pressure valve 1233 opens, and the pressure oil in the accumulator 1227 generates damping to prevent the floating platform 7 from moving downward.

[0073] In this state, the tension fluctuation of the loop mechanism is eliminated and absorbed by the damping of the accumulator 1227, the damping of the throttle valve 1232, and the opening and closing of the back pressure valve 1233.

[0074] The releasing process of this embodiment is achieved by the force of the tension system of the loop mechanism to realize the downward movement of the floating platform 7, rather than relying on the external force of external mechanical movement. This is completely different from the loop mechanism that relies on the feedback signal of the tension sensor and the external mechanical movement to drive the movement of the floating platform.

[0075] 3. Filling process: The filling process is switched from the releasing process. The filling button is pressed manually to enter the filling state. The high-speed operation state is started through the entrance drive device 1, and the speed is slowly reduced to the normal operation state (neither releasing nor filling state) according to the set speed reduction curve to achieve filling.

[0076] Start filling: The inlet drive device 1 starts the high-speed operation state, so that the coil substrate 6 obtains v A1 The speed, v A1 Higher than the speed v at point A under normal operating conditions A , while the coil substrate at point B is still v B If the floating platform 7 does not move upward, the coil substrate 6 will lose tension in the BA section. Therefore, when the electronic control system 14 starts the filling, the electromagnet of the first two-position two-way valve 1223 is energized to connect the first oil chamber oil inlet pipeline 122, the electromagnet of the second two-position two-way valve 1231 is de-energized to disconnect the first oil chamber overflow pipeline 123, and the electromagnet of the fourth two-position two-way valve 1291 is de-energized to disconnect the unloading pipeline 129. Then, the variable pump 1222 provides pressurized oil to the first oil chamber of the cylinder 8, driving the floating platform 7 to move upward.

[0077] The first two-position two-way valve 1223 conducts the first oil chamber oil inlet pipeline 122, and the variable pump 1222 provides pressure oil to the first oil chamber of the oil cylinder 8, so that the floating platform 7 moves upward, and the oil in the second oil chamber of the oil cylinder 8 is discharged into the high-position oil tank 126 through the second oil chamber oil port pipeline 125. When the sleeve filling is started, the coil substrate at point A flows in at high speed, and the coil substrate between CD loses tension instantly, and the downward force acting on the piston rod is reduced instantly, so that the system pressure is reduced, and the variable pump 1222 operates in a low-pressure and high-flow state, pushing the piston rod to move upward quickly, and quickly build tension on the coil substrate between CD.

[0078] After the tension is established, the tension rapidly increases the system pressure, and the variable pump 1222 operates in a high-pressure and low-flow state.

[0079] If the system pressure does not reach the set value of the pressure sensor 1226, the inlet drive device 1 will reduce the speed until the system pressure reaches the set value of the pressure sensor 1226, and then operate according to the originally set deceleration curve.

[0080] If the system pressure exceeds the set value of the pressure sensor 1226, the inlet drive device 1 slowly increases its speed until the system pressure reaches the set value of the pressure sensor 1226, and then operates according to the originally set deceleration curve.

[0081] The stroke of the piston rod is fed back to the electronic control system 14 in the form of an analog signal by the displacement sensor. Before the floating platform 7 reaches the upper limit, the inlet drive device 1 runs according to the originally set deceleration curve.

[0082] When the floating platform 7 reaches the upper limit, the electromagnet of the first two-position two-way valve 1223 loses power, disconnecting the first oil chamber oil inlet pipeline 122 from the pressure oil provided by the variable pump 1222. At the same time, the electromagnet of the fourth two-position two-way valve 1291 is energized, connecting the unloading pipeline 129 and unloading the variable pump 1222, thereby completing the filling process and the loop mechanism enters a normal operating state of neither releasing nor filling the loop.

[0083] Adjust the speed regulating valve 1224 to generate a certain oil resistance, so that the floating platform 7 can move upward more stably. In this state, the tension F in the loop mechanism = F B +W+F 液 +F 调 -F 缸 -F A .

[0084] From the foregoing discussion, the stability of the system tension is balanced by the oil resistance of the speed control valve 1224, the pressure provided by the variable pump 1222, and the operating speed of the inlet drive device 1. It is more flexible than the loop mechanism that drives the floating platform to move by external mechanical movement, so it has less impact on the coil substrate and more stable tension.

[0085] The travel switch 13 plays a role in system protection: the travel switch 13 is installed at the upper limit position of the floating platform 7, which is higher than the upper limit position set by the displacement sensor. When the travel switch 13 detects that the floating platform 7 has reached the upper limit position, it sends a signal. If the displacement sensor does not send the arrival signal to the electronic control system 14 at this time, the electronic control system stops the filling state and alarms.

[0086] The tension self-balancing method also includes a process of replenishing oil to the high-level oil tank 126: Since the hydraulic system inevitably has leakage, the liquid level of the high-level oil tank 126 is too low, which will affect the operation of the system. Therefore, a liquid level gauge 1264 is provided at the lower limit of the high-level oil tank 126. When the liquid level of the high-level oil tank 126 drops to the lower limit, the liquid level gauge 1264 sends a signal, and the electronic control system 14 determines the operating state of the loop mechanism and replenishes oil to the high-level oil tank 126 in different ways:

[0087] The loop mechanism is in the normal operation state or the release state: the electromagnet of the third two-position two-way valve 1281 is energized, the high-position oil tank oil supply pipeline 128 is connected, and the variable pump 1222 supplies oil to the high-position oil tank 126 (the oil supply amount is controlled by time);

[0088] When the loop mechanism is in the filling state, wait for the loop mechanism to switch to the normal operation state or the releasing state, and then connect the high-level oil tank oil replenishment pipeline 128.

[0089] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A hydraulically driven tension self-balancing looper mechanism, comprising an inlet drive device, a frame, an inlet guide roller, a fixed roller group, a floating roller group, a floating platform, a fixed platform, an outlet guide roller, and an outlet drive device; the frame is mounted and fixed on the fixed platform, and an inlet and an outlet are arranged on the frame; the floating platform is located above the fixed platform, and the floating platform is lifted and arranged on the frame; the fixed roller group is mounted on the fixed platform; the floating roller group is mounted on the floating platform; the inlet guide roller and the outlet guide roller are both rotatably mounted on the frame, the inlet guide roller is located at the inlet of the frame, and the outlet guide roller is located at the outlet of the frame; the inlet drive device is arranged beside the inlet of the frame, and the outlet drive device is arranged beside the outlet of the frame; Features: It also includes an oil cylinder and a hydraulic system; the oil cylinder is installed on a fixed platform, and the piston rod of the oil cylinder is connected to the floating platform; the hydraulic system includes a low-level oil tank, a high-level oil tank, a first oil chamber oil inlet pipeline, a first oil chamber overflow pipeline, a first oil chamber oil port pipeline, a second oil chamber oil port pipeline, a high-level oil tank oil replenishment pipeline and an unloading pipeline; one end of the first oil chamber oil inlet pipeline is connected to the low-level oil tank, and the other end is connected to the first oil chamber oil port pipeline; a variable pump, a first two-position two-way valve, a speed regulating valve, a first non-return valve and an accumulator are sequentially arranged on the first oil chamber oil inlet pipeline along the oil circuit direction; one end of the first oil chamber overflow pipeline is connected to the first oil chamber oil port pipeline, and the other end is connected to the low-level oil tank, and a second two-position two-way valve, a speed regulating valve, a first non-return valve and an accumulator are sequentially arranged along the oil circuit direction Valve, throttle valve and back pressure valve; the first oil chamber oil port pipeline is connected to the first oil chamber of the oil cylinder; one end of the second oil chamber oil port pipeline is connected to the second oil chamber of the oil cylinder, and the other end is connected to the high-level oil tank, and a filter and a second non-return valve are arranged in parallel on the oil circuit; one end of the high-level oil tank oil supply pipeline is connected to the first oil chamber oil inlet pipeline, and the connection point is between the variable pump and the first two-position two-way valve, and the other end of the high-level oil tank oil supply pipeline is connected to the high-level oil tank; a third two-position two-way valve is arranged on the high-level oil tank oil supply pipeline; one end of the unloading pipeline is connected to the first oil chamber oil inlet pipeline, and the connection point is between the variable pump and the first two-position two-way valve, and the other end of the unloading pipeline is connected to the low-level oil tank, and a fourth two-position two-way valve is arranged on the unloading pipeline.

2. The hydraulically driven tension self-balancing looper mechanism according to claim 1 is characterized in that: The high-position oil tank is provided with an air filter, an oil drain valve and a liquid level gauge.

3. The hydraulically driven tension self-balancing looper mechanism according to claim 1 is characterized in that: The hydraulic system also includes a system overflow pipeline, one end of which is connected to the first oil chamber oil inlet pipeline, the connection point is set between the variable pump and the first two-position two-way valve, and the other end of the system overflow pipeline is connected to the low-level oil tank; an overflow valve is provided on the system overflow pipeline.

4. The hydraulically driven tension self-balancing looper mechanism according to claim 1 is characterized in that: The frame comprises a steel structure frame and a guide rail, wherein the guide rail is installed on the steel structure frame perpendicular to the fixed platform; and the floating platform is movably connected to the guide rail.

5. The hydraulically driven tension self-balancing looper mechanism according to claim 1 is characterized in that: The oil cylinder is provided with a displacement sensor.

6. The hydraulically driven tension self-balancing looper mechanism according to claim 1, characterized in that: It also includes a travel switch, which is fixed on the frame and located at the upper limit position of the floating platform.

7. The hydraulically driven tension self-balancing looper mechanism according to claim 1 is characterized in that: A pressure sensor is arranged on the oil inlet pipeline of the first oil chamber.

8. A tension self-balancing method for a hydraulically driven tension self-balancing looper mechanism according to any one of claims 1 to 7, characterized in that: The process includes the following: Assume: the entry point of the entry drive device is point A, the exit point of the exit drive device is point B; the driving force applied by the entry drive device on the coil substrate along the traveling direction is F A , so that its velocity is v A The force applied by the outlet drive device to the coil substrate along the travel direction is F B , so that its velocity is v B The tangent point between the coil substrate and the inlet guide roller is point C, and the tangent point between the coil substrate and the outlet guide roller is point D; the combined force of the gravity of the floating roller group and the floating platform is W, and the upward thrust of the piston rod of the hydraulic system driving the oil cylinder on the floating platform is F 缸 ; The upward thrust of the accumulator on the floating platform is F 蓄 ; The downward pulling force exerted by the oil in the high-level oil tank on the piston rod of the oil cylinder is F 液 ; The resistance of the throttle valve to prevent the floating platform from moving downward is F 节 ; The resistance of the speed regulating valve is F 调 ; 1. Normal operation state: The floating platform is at the upper limit position, the electromagnets of the second two-position two-way valve and the first two-position two-way valve are not energized, the overflow pipeline of the first oil chamber is disconnected; the oil inlet pipeline of the first oil chamber is disconnected from the pressure oil provided by the variable pump, the electromagnet of the fourth two-position two-way valve is energized, the unloading pipeline is connected, and the variable pump is unloaded; at this time, the accumulator is in the pressure-maintaining state, and the tension F in the looper mechanism = F B +W+F 液 -F 蓄 -F A ; When the accumulator acts on the floating platform, the upward thrust F 蓄 = W+F 液 When , the tension in the loop mechanism is in a stable state; Because v A 、v B The fluctuation of F B 、F A The change of the tension F and the resulting fluctuation of the tension F will cause the floating platform to move upward or downward. The accumulator absorbs the tension fluctuation caused by the downward movement of the floating platform; the oil resistance F of the oil in the high-level oil tank 液 To absorb the tension fluctuation caused by the upward movement of the floating platform and balance the tension; The up and down fluctuations of the floating platform are absorbed by the oil resistance of the accumulator and the high-level oil tank, which is carried out within a small stroke range. When the fluctuation range of the floating platform exceeds the set range, it is necessary to adjust the operating speed of the inlet drive device to balance the tension: When the floating platform moves downward beyond the set value, the entrance drive device increases speed until the floating platform returns to the set area to achieve tension balance; When the floating platform moves upwards beyond the set value, the entrance drive device slows down until the floating platform returns to the set area to achieve tension balance; 2. Release process: The inlet drive device is braked, so that no more coil substrate enters point A. At the same time, the electromagnet of the second two-position two-way valve is energized, so that the throttle valve and back pressure valve on the overflow pipeline of the first oil chamber are connected with the oil port pipeline of the first oil chamber; At this time v A =0,F A = 0, no more coil substrate enters point A, and the coil substrate at point B is still v B The speed of the flow is F B Conducting on the BA section of the coil substrate, the floating platform moves downward, which will shorten the length of the coil substrate between points CD and achieve the release; F B The floating platform moves downward, and the oil pressure in the first oil chamber of the oil cylinder rises to reach the set pressure of the back pressure valve. The back pressure valve opens, and the oil in the first oil chamber of the oil cylinder returns to the low-level oil tank through the overflow pipeline of the first oil chamber. At the same time, the oil in the high-level oil tank replenishes oil to the second oil chamber of the oil cylinder under the pressure difference formed by the liquid level difference. At this time, the tension inside the looper mechanism is F = F B +W+F 液 -F 蓄 -F 节 ; As long as the throttle valve oil resistance is adjusted, F 节 =F A , the tension in the loop mechanism can be kept in a stable state; When the floating platform moves downward, the oil pressure in the first oil chamber of the oil cylinder rises. Before reaching the set pressure of the back pressure valve, the pressure oil discharged from the first oil chamber replenishes the oil in the accumulator, reaching the set pressure of the back pressure valve. The back pressure valve opens, and the pressure oil in the accumulator produces damping to prevent the floating platform from moving downward. In this state, the tension fluctuation of the looper mechanism is eliminated and absorbed by the damping of the accumulator, the damping of the throttle valve, and the opening and closing of the back pressure valve; 3. Filling process: The inlet drive device starts the high-speed operation state and slowly slows down to the speed of the normal operation state to achieve filling; Start filling: The entrance drive device starts the high-speed operation state, so that the coil substrate at point A obtains v A1 The speed, v A1 Higher than the normal running speed v A , while the coil substrate at point B is still v B The oil flows out at a speed of ; the electromagnet of the first two-position two-way valve is energized to connect the oil inlet pipeline of the first oil chamber, the electromagnet of the second two-position two-way valve is de-energized to disconnect the overflow pipeline of the first oil chamber, the electromagnet of the fourth two-position two-way valve is de-energized to disconnect the unloading pipeline, and the variable pump provides pressure oil to the first oil chamber of the oil cylinder, pushing the piston rod to move upward, driving the floating platform to move upward, and establishing tension on the coil substrate between the CDs; When the floating platform reaches the upper limit, the electromagnet of the first two-position two-way valve loses power, disconnecting the oil inlet line of the first oil chamber from the pressure oil provided by the variable pump. At the same time, the electromagnet of the fourth two-position two-way valve is energized, connecting the unloading line and unloading the variable pump, thus completing the filling process and the loose sleeve mechanism enters the normal operating state of neither releasing nor filling the sleeve.

9. The tension self-balancing method according to claim 8, characterized in that: A pressure sensor is provided on the oil inlet pipeline of the first oil chamber. During the filling process: if the pressure does not reach the set value of the pressure sensor, the inlet drive device will reduce the speed until the pressure reaches the set value of the pressure sensor; if the system pressure exceeds the set value of the pressure sensor, the inlet drive device will increase the speed until the pressure reaches the set value of the pressure sensor.

10. The tension self-balancing method according to claim 8, characterized in that: It also includes the process of replenishing oil to the high-level oil tank: in the normal operation state or the sleeve release state: the solenoid of the third two-position two-way valve is energized, the high-level oil tank oil replenishment pipeline is connected, and the variable pump replenishes oil to the high-level oil tank; when the slip-on mechanism is in the sleeve filling state, it waits to switch to the normal operation state or the sleeve release state, and then the high-level oil tank oil replenishment pipeline is connected.

Images