Oil-gas lubrication control method for fixed-period variable-stroke rolling mill

Abstract

According to the fixed-period variable-stroke rolling mill oil-gas lubrication control method, an oil-gas lubrication system is included, and the oil-gas lubrication system comprises a hydraulic master station, a hydraulic substation, a first-stage oil-gas distributor and a second-stage oil-gas distributor; the oil quantity is uniformly distributed or proportionally distributed by a progressive distributor, and the total oil supply amount and the oil supply period are controlled by an electromagnetic valve by controlling the oil pumping times of the progressive distributor; a PLC program of the electric control system is set to control the oil supply work of the whole oil-gas lubricating system; and the working state of the progressive distributor is monitored. According to the oil-gas lubricating system, the working state and working condition parameters of the rolling mill are monitored in real time, the lubricating oil amount is intelligently calculated and dynamically adjusted, it is guaranteed that the lubricating oil is supplied at a proper moment and in a proper amount, the lubricating effect is improved, and the bearing service life is prolonged. A PLC automatic control system is utilized, the work cycle and the oil supply amount of the oil-gas lubricating system are accurately adjusted, and the automation level and the lubricating efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil-gas lubrication of rolling mills, in particular to a rolling mill oil-gas lubrication control method with a fixed period and variable stroke. Background Art

[0002] Oil-gas lubrication technology is a process of lubrication by mixing lubricating oil with compressed air to form a two-phase turbulent oil-gas mixed fluid, which is then transported to the friction surface that needs lubrication. Its main advantage is that it can maximize the service life of the bearing without being limited by the viscosity of the lubricating oil. Compared with traditional oil lubrication systems, oil-gas lubrication has unique advantages in many aspects. The oil-gas lubrication system uses compressed air to form a mixed fluid of air flow and oil flow, forming a uniform lubricating film on the friction surface, reducing direct contact friction and significantly extending the service life of moving parts such as bearings and guide rails.

[0003] Traditional oil-gas lubrication control systems mostly use manual control and timing control. Manual control relies on manual operation, which is not only inefficient, but also easily affected by human factors. It is impossible to adjust the lubricant supply in real time, resulting in unstable lubrication effect. In addition, manual operation is also prone to oil leakage, over-lubrication or insufficient lubrication, which reduces the reliability and efficiency of the system. Timing control supplies oil through a preset cycle, and the degree of automation is relatively high, but it still cannot cope with changes in actual working conditions. For example, if the load or speed of the equipment changes, the timing control cannot automatically adjust the oil supply, resulting in possible waste of lubricating oil or insufficient lubrication, thereby affecting the working performance and service life of the equipment. The working mode of the traditional control system cannot accurately adjust the lubricating oil according to the actual load, speed and other working conditions, resulting in the system's lubrication effect may not reach the optimal state. Especially when the load changes greatly or the working environment conditions fluctuate greatly, the timing control system is difficult to adapt to rapidly changing needs. Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a rolling mill oil-gas lubrication control method with fixed-cycle variable stroke.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a rolling mill oil-gas lubrication control method with a fixed period and variable stroke, comprising an oil-gas lubrication system, wherein the oil-gas lubrication system comprises a hydraulic main station, a hydraulic substation, a primary oil-gas distributor and a secondary oil-gas distributor;

[0006] Adjustment of oil quantity by variable stroke control in fixed period: the progressive distributor distributes the oil evenly or proportionally, and the solenoid valve controls the total oil supply and oil supply cycle by controlling the oil pumping times of the progressive distributor;

[0007] Set up the PLC program of the electronic control system to control the oil supply of the entire oil and gas lubrication system;

[0008] Monitor the working status of the progressive distributor.

[0009] As a further improvement of the present invention: the oil-gas lubrication system also includes an oil supply and oil quantity distribution unit, an air supply unit, an oil-gas mixing unit, an oil-gas flow monitoring unit, and an oil-gas transmission and electronic control device.

[0010] As a further improvement of the present invention: the hydraulic main station is responsible for supplying lubricant to the substation, including an oil tank and its accessories.

[0011] As a further improvement of the present invention: the hydraulic main station is equipped with two gear pumps, one for operation and one for standby, for supplying lubricant. The gear pump is a quantitative pump with a displacement of 1.7 L / min.

[0012] As a further improvement of the present invention: the gear pump works in an intermittent working mode, and the working cycle is determined by the oil pressure. When the oil pressure is lower than 50 bar, the pump starts working, and when the oil pressure is higher than 70 bar, the pump stops working.

[0013] As a further improvement of the present invention: the hydraulic substation includes an oil distribution, a compressed air processing device and an oil-gas mixing part; the substation mainly distributes the lubricant supplied by the main station and mixes it with compressed air to form an oil-gas flow.

[0014] As a further improvement of the present invention: the oil distribution part includes an electromagnetic reversing valve and a progressive distributor downstream thereof.

[0015] As a further improvement of the present invention: the metering and distribution of the lubricant is achieved by controlling the switching on or off of the reversing solenoid valve to supply the progressive distributor with pressure oil.

[0016] As a further improvement of the present invention: the progressive distributor is provided with a proximity switch which can count the working stroke number of the distributor. Once the stroke number reaches a preset value, the reversing valve will be closed to achieve the function of quantitative oil supply.

[0017] As a further improvement of the present invention: the compressed air processing device and the oil-gas mixing part are equipped with a set of compressed air processing device and an oil-gas mixing block.

[0018] As a further improvement of the present invention: the compressed air processing device includes a stop valve, an air filter, an electromagnetic reversing valve, a pressure reducing valve, a pressure switch and a pressure gauge, and the compressed air processing device performs pressure adjustment, on-off switching and pressure monitoring on the compressed air.

[0019] As a further improvement of the present invention: the oil-gas mixing block is used to achieve mixing of lubricating oil and compressed air to form an oil-gas flow, and to transport the mixed oil and gas to the lubrication point more evenly.

[0020] As a further improvement of the present invention: the lubricating oil and compressed air mixed by the oil-gas mixing block come from the lubricating oil distributed by the progressive distributor and the clean compressed air supplied by the compressed air processing device after decompression treatment.

[0021] As a further improvement of the present invention, the pressure oil flowing through the progressive distributor will trigger a proximity switch installed on the progressive distributor to send an induction signal to the control system.

[0022] As a further improvement of the present invention: the adjustment of the fixed-cycle variable stroke control oil volume includes the following steps:

[0023] With the oil supply cycle as the X-axis and the oil supply amount as the Y-axis, the oil supply amount per unit time U=X*Y, where Y=number of strokes i*oil supply amount per single stroke J, we can get U=X*I*J, where J is regarded as a constant.

[0024] As a further improvement of the present invention: there are two ways to change the oil supply of the oil-gas lubrication system. The first is to fix the oil supply cycle and change the number of strokes; the other is to fix the number of strokes and change the oil supply cycle. The first way is suitable for working conditions where the oil supply demand changes little, and the second way is suitable for working conditions where the oil supply demand changes greatly.

[0025] As a further improvement of the present invention: after the oil supply cycle X is processed by the control system, the upstream reversing solenoid valve of the progressive distributor is controlled to start periodically, and the stroke number i is converted into a comparison number of the internal comparator of the system after being processed by the control system. This number is compared with the count value of the induction signal emitted by the proximity switch installed on the distributor when the progressive distributor is working. When the count value is equal to the comparison number, the control system controls the reversing solenoid valve to close and the system stops supplying oil.

[0026] As a further improvement of the present invention: after the system is initially started, the internal timer starts counting down with the time set by the oil supply cycle X. When the countdown ends, the reversing solenoid valve is controlled to be turned on, and the progressive distributor starts to supply oil. When the number of working strokes of the progressive distributor reaches the set number of strokes I, the system controls the reversing solenoid valve to be turned off and the oil supply is stopped. The internal timer repeats the countdown with the time set by the oil supply cycle X, and the above process is repeated.

[0027] As a further improvement of the present invention: the PLC program of the electronic control system controls the oil supply work of the entire oil-gas lubrication system, including setting a corresponding working screen on the human-machine interface or the HMI next to the machine for remote mode start / shutdown of the oil-gas lubrication system and displaying the working status of the oil-gas lubrication system.

[0028] As a further improvement of the present invention: the monitoring of the working state of the progressive distributor includes the following steps: setting a total monitoring time, and the progressive distributor must complete a specified number of strokes within the total monitoring time after receiving a work instruction, otherwise an alarm signal is issued.

[0029] As a further improvement of the present invention: the liquid level of the oil tank of the master station is monitored by a liquid level switch, and when the lubricant in the oil tank is lower than a preset value, the liquid level switch sends an alarm signal.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The oil-gas lubrication system of the present invention can monitor the working status of the rolling mill in real time, including working parameters such as load and speed, and calculate and provide the most suitable amount of lubricating oil through intelligent algorithms. Compared with the timed oil supply of the traditional system, the present invention adjusts the oil-gas mixing ratio according to actual needs to ensure that the lubricating oil is supplied at the appropriate time and in the appropriate amount, avoiding the waste of lubricating oil or insufficient oil supply, and improving the lubrication effect and bearing life;

[0032] (2) The present invention uses PLC to automatically control the lubrication cycle; the PLC programming system can automatically adjust the working stroke of the oil-gas lubrication system based on the workload and speed of the rolling mill, and dynamically adjust the lubricating oil supply in each cycle by accurately controlling the working cycle of the system, thereby ensuring that the lubricating oil supply matches the actual working condition of the rolling mill; this control method not only improves the automation level of the system, but also can optimize the lubrication cycle in real time according to changes in the equipment working conditions, avoiding the errors and inconveniences caused by traditional manual control and timing control methods;

[0033] (3) The core advantage of the lubrication control method of the present invention is that it can be dynamically adjusted according to the actual working conditions of the rolling mill. By acquiring the equipment working condition data in real time, the system can accurately calculate the optimal lubricating oil supply and cycle to ensure that the equipment can be optimally lubricated under any working conditions, reducing the phenomenon of insufficient or excessive lubrication caused by load changes, speed changes, etc., which is common in traditional lubrication systems. Dynamic adjustment of lubrication strategies not only improves the operating efficiency and reliability of the equipment, but also reduces energy consumption and reduces the waste of lubricating oil.

[0034] (4) Through the optimization and adjustment of the intelligent control system, the oil-gas lubrication system of the present invention can accurately adjust the supply of lubricating oil, avoid the phenomenon of over-lubrication, and effectively reduce energy consumption; at the same time, the precise oil supply and automatic cycle control greatly reduce the frequency of manual intervention and maintenance, and reduce equipment maintenance costs. In addition, the dynamic adjustment of the oil-gas lubrication system can enable the rolling mill to maintain the optimal lubrication state under different loads and speeds, extend the service life of the equipment, and further reduce long-term operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solution, the drawings required for use in the implementation will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 It is a schematic diagram of the structure of the oil and gas lubrication control system of the present invention.

[0037] Figure 2 It is the oil quantity control logic flow chart of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] Oil-gas lubrication technology is a process of lubrication by mixing lubricating oil with compressed air to form a two-phase turbulent oil-gas mixed fluid, which is then transported to the friction surface that needs lubrication. The manual control method in the traditional oil-gas lubrication system relies entirely on manual operation, which is inefficient and easily affected by human factors. Manual operation cannot adjust the supply of lubricant in real time, resulting in unstable lubrication effect, oil leakage, over-lubrication or under-lubrication, thereby reducing the reliability and lubrication effect of the system. This inefficient manual intervention not only increases the difficulty of operation, but may also cause equipment failure or premature damage, increasing maintenance costs. The existing timing control system supplies oil through a preset cycle, which relatively improves the degree of automation, but still cannot be dynamically adjusted according to the actual working conditions of the equipment (such as load, speed, etc.). When the load or speed of the equipment changes, the timing control cannot adjust the supply of lubricating oil in real time. This means that under certain working conditions, the lubricating oil may be oversupplied or undersupplied, resulting in uneven lubrication, which affects the working performance and service life of the equipment. The traditional oil-gas lubrication system cannot accurately adjust the supply of lubricating oil according to the actual load, speed and other working conditions. In particular, when equipment loads vary greatly or working environment conditions fluctuate greatly, traditional timing control systems are difficult to adapt to rapidly changing needs. This inflexible adjustment method makes it difficult for the lubrication system to provide optimal lubrication under different working conditions, which may increase the friction loss of the equipment and shorten the service life of bearings and other moving parts. Since the adjustment method of the traditional control system cannot respond to actual working condition changes in real time, it often causes waste of lubricating oil or insufficient lubrication, which in turn leads to increased energy consumption and reduced lubrication efficiency. Excessive supply of lubricating oil not only wastes resources, but may also cause pollution problems; insufficient supply may cause premature wear of equipment and increase maintenance costs. Therefore, traditional oil and gas lubrication systems fail to achieve efficient and energy-saving lubrication control.

[0041] In order to solve the above problems, the present invention provides a rolling mill oil-gas lubrication control method with fixed period and variable stroke, comprising an oil-gas lubrication system, wherein the oil-gas lubrication system comprises a hydraulic main station, a hydraulic substation, a primary oil-gas distributor and a secondary oil-gas distributor;

[0042] Adjustment of oil quantity by variable stroke control in fixed period: the progressive distributor distributes the oil evenly or proportionally, and the solenoid valve controls the total oil supply and oil supply cycle by controlling the oil pumping times of the progressive distributor;

[0043] Set up the PLC program of the electronic control system to control the oil supply of the entire oil and gas lubrication system;

[0044] Monitor the working status of the progressive distributor.

[0045] With the control of the progressive distributor, the supply of lubricating oil can be distributed evenly or proportionally as needed, which enables the oil-gas lubrication system to accurately control the total oil supply in each working cycle. The solenoid valve flexibly controls the supply and cycle of lubricating oil by adjusting the number of oiling times of the progressive distributor, ensuring that the system can provide the most appropriate amount of lubricating oil under any working conditions. Compared with the traditional timing control method, this technology realizes the precise control of the supply of lubricating oil, avoids excessive or insufficient lubrication, and effectively improves the lubrication effect. The PLC program is used to control the entire oil-gas lubrication system, and the degree of automation is greatly improved; through the precise adjustment of the progressive distributor and the real-time monitoring of the PLC system, the supply of lubricating oil can be dynamically adjusted according to the actual working conditions such as the load and speed of the rolling mill.

[0046] As an embodiment of the present invention, the oil-gas lubrication system also includes an oil supply and oil quantity distribution unit, an air supply unit, an oil-gas mixing unit and an oil-gas flow monitoring unit, an oil-gas transmission and electronic control device; the hydraulic main station is responsible for supplying lubricant to the substation, and the hydraulic main station includes an oil tank and its accessories; the hydraulic main station is equipped with two gear pumps, one working and one standby, for supplying lubricant; the hydraulic substation includes an oil quantity distribution, a compressed air processing device and an oil-gas mixing unit; the substation mainly distributes the lubricant supplied by the main station and mixes it with compressed air to form an oil and gas flow; the oil quantity distribution part includes an electromagnetic reversing valve and a progressive distributor downstream thereof; the metering and distribution of the lubricant is achieved by controlling the connection or disconnection of the reversing solenoid valve to supply the progressive distributor with pressure oil; the progressive distributor is provided with a proximity switch to count the number of working strokes of the distributor, and once the number of strokes reaches a preset value, the reversing valve will be closed.

[0047] The oil-gas lubrication system realizes the precise metering and distribution of lubricants through the combination of electromagnetic reversing valve and progressive distributor. The supply of lubricating oil is precisely controlled by the connection and disconnection of the electromagnetic valve, ensuring the precise distribution of oil in each working cycle. The matching of the stroke number of the progressive distributor with the preset value ensures the quantitative and uniformity of oil supply, avoids excessive or insufficient lubrication, and improves the lubrication effect and the operation stability of the equipment. The lubricant is mixed with oil and compressed air to form an oil-gas flow and transported to the lubrication point through the cooperation of the hydraulic main station and the substation. The oil-gas mixing block ensures the uniform mixing of lubricating oil and compressed air, and the formed oil-gas flow can effectively cover the lubrication surface, reduce friction and wear, and extend the service life of the equipment. At the same time, the oil-gas flow delivery process is coordinated and controlled by the oil-gas delivery device and the electronic control device, ensuring the efficient operation and stability of the system. The system supplies lubricant through the gear pump in the hydraulic main station, and adopts two gear pumps (one working and one standby) to ensure the continuity and reliability of oil supply. The electronic control system controls the operation of the entire oil-gas lubrication system through PLC programming to ensure automatic operation and reduce manual intervention. The system can monitor the oil and gas flow in real time, and track the oil supply through the oil and gas flow monitoring unit, and adjust the lubricant supply in time to ensure the most appropriate lubrication amount under different working conditions. By accurately controlling the lubricant supply amount and oil supply cycle, this solution can provide the best lubrication conditions for the equipment under different working conditions, reduce friction and wear, and significantly extend the service life of the equipment. The uniformity and stability of the oil and gas mixed fluid effectively ensure the protection of the lubrication surface and reduce the wear and failure of the equipment.

[0048] As an embodiment of the present invention, the gear pump is a quantitative pump with a displacement of 1.7L / min; the gear pump works in an intermittent working mode, and the working cycle is determined by the oil pressure. When the oil pressure is lower than 50bar, the pump starts working, and when the oil pressure is higher than 70bar, the pump stops working.

[0049] The gear pump is a metering pump with a displacement of 1.7L / min, which can provide a stable flow of lubricating oil in each operation cycle. The use of a metering pump ensures that the amount of lubricating oil pumped each time is fixed, thereby ensuring the oil supply accuracy of the oil-gas lubrication system and avoiding lubricating oil waste or insufficient oil supply. The working cycle of the gear pump is determined by the oil pressure. It starts when it is lower than 50bar and stops when it is higher than 70bar. This intermittent working mode can realize the dynamic supply of lubricating oil and avoid energy waste caused by continuous oil supply. By automatically controlling the operation and stop of the pump by oil pressure, the system can flexibly respond to lubrication needs under different loads, ensuring that oil is supplied only when lubrication is required, reducing energy consumption and improving the overall efficiency of the system. Since the working cycle of the gear pump is closely related to the oil pressure, it only starts to work when the oil pressure is lower than 50bar and automatically stops when the oil pressure is higher than 70bar. This automated control method effectively avoids invalid working time and reduces energy waste. The pump automatically stops when it is not needed to provide lubrication, reducing power consumption and optimizing the energy efficiency of the entire oil-gas lubrication system. Due to the intermittent working mode of the gear pump, the pump is not in working condition in every cycle, which reduces the continuous load and wear of the pump and extends the service life of the pump.

[0050] As an embodiment of the present invention, the compressed air processing device and the oil-gas mixing part are equipped with a set of compressed air processing devices and an oil-gas mixing block; the compressed air processing device includes a shut-off valve, an air filter, an electromagnetic reversing valve, a pressure reducing valve, a pressure switch and a pressure gauge, and the compressed air processing device performs pressure adjustment, on-off switching and pressure monitoring on the compressed air; the oil-gas mixing block is used to achieve the mixing of lubricating oil and compressed air to form an oil-gas flow, and transport the mixed oil and gas to the lubrication point more evenly; the lubricating oil and compressed air mixed by the oil-gas mixing block come from the lubricating oil distributed by the progressive distributor and the clean compressed air supplied by the compressed air processing device after pressure reduction treatment; the pressure oil flowing through the progressive distributor will trigger the proximity switch installed on the progressive distributor to send an induction signal to the control system.

[0051] The compressed air treatment device includes several important components, such as stop valve, air filter, solenoid reversing valve, pressure reducing valve, pressure switch and pressure gauge, which can realize the precise regulation of compressed air. The pressure reducing valve reduces the pressure of compressed air to ensure that the pressure of compressed air meets the requirements of the system; the air filter removes impurities in the air to ensure the cleanliness of compressed air; the solenoid reversing valve accurately controls the supply of airflow by switching the air on and off to avoid unnecessary waste of airflow. The oil-gas mixing block realizes the precise mixing of lubricating oil and compressed air to form an oil-gas flow to the lubrication point. The mixing process of lubricating oil and compressed air is precisely controlled to ensure the stability of the mixing ratio and avoid uneven or excessive / too little oil and air. This uniform oil-gas flow can effectively reduce friction, reduce component wear and extend the service life of the equipment. The oil-gas flow controls the oil volume through the progressive distributor, and triggers the proximity switch to send an induction signal to the control system, thereby realizing real-time monitoring and feedback of the oil-gas flow. It ensures the precise measurement of each oil supply, and adjusts the flow and supply cycle of the oil-gas flow according to actual needs to ensure that the supply of lubricating oil is neither too much nor too little, avoiding waste or insufficiency. Through real-time monitoring and feedback, the system can adaptively adjust lubrication conditions to ensure that the equipment is always in the best lubrication state. Since the compressed air treatment device can accurately adjust the pressure, flow and cleanliness of compressed air, the system can maintain a stable oil and air flow supply during operation to avoid unstable lubrication effects caused by compressed air problems.

[0052] As an embodiment of the present invention, in the oil-gas lubrication system, the metering and distribution of the lubricant is performed by a progressive distributor. In the hydraulic substation, a ball-seat-type structured non-leakage electromagnetic reversing valve is installed upstream of the progressive distributor, through which the pressure oil supplied to the progressive distributor can be connected or disconnected. Since the progressive distributor is equipped with a proximity switch, the number of working strokes of the distributor can be counted. Once the number of strokes reaches the set value, the ball-seat reversing valve will be closed, and then the progressive distributor will stop working until the next working cycle. The lubricating oil comes out of the main station and is supplied to the substation, and is distributed to the downstream oil-gas mixing block by the progressive distributor, and then distributed to each bearing seat through the two-stage oil-gas distributor.

[0053] The design of the progressive distributor enables the lubricating oil to be distributed according to the predetermined amount and cycle, ensuring the accuracy of lubricating oil supply; the proximity switch on the progressive distributor realizes real-time monitoring of the working stroke. When the progressive distributor completes the set stroke, the proximity switch triggers a signal, and the control system immediately closes the oil supply through the ball-seated electromagnetic reversing valve, suspending the distributor until the next working cycle. It ensures that the supply of lubricating oil will not be excessive and can automatically adapt to different working cycles; the lubricating oil is supplied to the substation through the main station, and the progressive distributor is accurately distributed at the substation to ensure that the lubricating oil is provided to the oil-gas mixing block according to the set proportion and cycle. The oil-gas mixing block mixes the lubricating oil with compressed air to form an oil-gas flow, which is further distributed to each bearing seat through a two-stage oil-gas distributor. The operation of the system is automatically controlled by the proximity switch and the electromagnetic reversing valve, and the supply of lubricating oil can be automatically adjusted according to the oil demand. The system can monitor the supply status of the lubricating oil in real time, and automatically adjust the supply cycle and amount of the oil-gas flow through the precise coordination of the proximity switch and the electromagnetic reversing valve.

[0054] As an embodiment of the present invention, the adjustment of the fixed-cycle variable stroke control oil volume includes the following steps:

[0055] With the oil supply cycle as the X-axis and the oil supply amount as the Y-axis, the oil supply amount per unit time U=X*Y, where Y=number of strokes i*oil supply amount per single stroke J, we can get U=X*I*J, where J is regarded as a constant.

[0056] As an embodiment of the present invention, the oil quantity regulation of the fixed-cycle variable stroke control method is completed by a progressive distributor and an electromagnetic valve upstream thereof. The progressive distributor can achieve uniform or proportional oil quantity distribution, and the electromagnetic valve controls the total oil supply and oil supply cycle by controlling the number of oil pumping times of the progressive distributor.

[0057] Preferably, the progressive distributor adopts an intermittent working mode, that is, the progressive distributor has a pause / working cycle. When the number of strokes of a progressive distributor reaches a set value, the electromagnetic valve upstream of the progressive distributor will be closed and enter a standby state, waiting for the next working cycle to arrive and start working again.

[0058] The fixed cycle variable stroke control method is to control the oil-gas lubrication system to supply the bearing with the appropriate amount of oil according to the working condition changes. The fixed cycle is to control the oil supply cycle, and the variable stroke is to control the oil supply amount in each cycle. The combination of the two is

[0059] As an embodiment of the present invention, there are two ways to change the oil supply of the oil-gas lubrication system. The first is to fix the oil supply cycle and change the number of strokes; the other is to fix the number of strokes and change the oil supply cycle. The first method is suitable for working conditions where the oil supply demand changes little, and the second method is suitable for working conditions where the oil supply demand changes greatly.

[0060] Among them, after the oil supply cycle X is processed by the control system, the upstream reversing solenoid valve of the progressive distributor is controlled to start periodically. The stroke number i is converted into a comparison number of the internal comparator of the system after being processed by the control system. This number is compared with the count value of the induction signal emitted by the proximity switch installed on the distributor when the progressive distributor is working. When the count value is equal to the comparison number, the control system controls the reversing solenoid valve to close and the system stops supplying oil.

[0061] As an embodiment of the present invention, after the system is initially started, the internal timer starts counting down at the time set by the oil supply cycle X. When the countdown ends, the reversing solenoid valve is controlled to be turned on, and the progressive distributor starts to supply oil. When the number of working strokes of the progressive distributor reaches the set number of strokes I, the system controls the reversing solenoid valve to be turned off and the oil supply is stopped. The internal timer repeats the countdown at the time set by the oil supply cycle X, and the above process is repeated.

[0062] Through the relationship between the oil supply cycle (X axis) and the oil supply amount (Y axis), the formula U = X*I*J (where J is a constant) can be used to accurately control the oil supply per unit time. The oil supply amount (U) is multiplied by the oil supply cycle (X) and the number of strokes (I), ensuring that the supply of lubricating oil is neither too much nor too little, which meets the actual needs. The precise matching of the number of strokes and the oil supply amount of a single stroke ensures that the supply of lubricant matches the changes in the equipment working conditions, improving the lubrication effect and system stability. The combination of fixed cycle and variable stroke allows the oil supply to be flexibly adjusted according to the changes in working conditions. Under working conditions with small changes in oil supply, the oil supply can be adjusted by changing the number of strokes by fixing the oil supply cycle; while under working conditions with large fluctuations in oil supply demand, the oil supply cycle can be changed by fixing the number of strokes to adapt. The intermittent working mode of the progressive distributor effectively controls the supply of oil by setting the number of strokes and the working / pause cycle. The system counts down according to the set cycle and controls the opening and closing of the solenoid valve through the induction signal to ensure accurate and stable supply of lubricant.

[0063] As an embodiment of the present invention, the electronic control system adopts Siemens PLC electronic control system and is configured with WINCC human-machine interface and machine-side HMI. The PLC control program is used to control the oil supply of the entire oil-gas lubrication system. The human-machine interface or machine-side HMI is provided with a corresponding working screen for remote mode start / shutdown of the oil-gas lubrication system and display of the working status of the oil-gas lubrication system. In addition, some interlocking conditions for the operation of the oil-gas lubrication system are also provided to ensure safe and reliable operation of the equipment.

[0064] The PLC program precisely controls the operation of the lubrication system to ensure the timeliness, accuracy and stability of the oil and gas supply. With the WINCC human-machine interface, the operator can understand the operating status of the oil and gas lubrication system in real time through the remote monitoring system. Through the remote mode start / shutdown function, the operator can start or shut down the oil and gas lubrication system without on-site operation, which increases the convenience of operation. The combination of the PLC system and HMI makes equipment fault diagnosis and maintenance more convenient. Through the system log recording and fault alarm function, the operator can trace the source of the problem and perform maintenance and repair in time. Due to the automation and remote control functions of the system, manual intervention is greatly reduced, and the operator only needs to monitor and manage, saving labor costs. The automated control of the system also ensures the accuracy of lubricating oil supply, avoids system failures or insufficient lubrication caused by manual operation errors, and improves production efficiency and equipment uptime.

[0065] As an embodiment of the present invention, in order to ensure the normal operation of the system, the working state of the progressive distributor must be monitored. The monitoring method adopted is to set a total monitoring time. After receiving the work instruction, the progressive distributor must complete the specified number of strokes within the total monitoring time, otherwise an alarm signal is issued. For example, the monitoring time for each stroke is 8 seconds, and the distributor is required to work 6 strokes. It takes 48 seconds for the distributor to work 6 strokes, so the total monitoring time of the system can be set to slightly more than 48 seconds, such as 55 seconds. In other words, if the progressive distributor does not work less than 6 strokes within 55 seconds, the system alarms.

[0066] In addition, the liquid level of the main station oil tank is monitored by a liquid level switch. When only 1 / 3 of the lubricant in the oil tank is left, the liquid level switch will send out an alarm signal. When the liquid level of the main station oil tank is lower than the minimum level, the liquid level switch will send out a fault signal. At this time, the red signal light will be on to indicate that the system has a fault. The system will stop running after this fault occurs, and the system can only start working again after the specified amount of oil is added. The compressed air operating pressure of the system is set by the pressure reducing valve. If the pressure is lower than 2 bar, the pressure switch will send out a fault signal and the system will automatically stop running.

[0067] By setting the total monitoring time and ensuring that the progressive distributor can complete the predetermined number of strokes within the specified time after receiving the work order, the fault warning capability of the system is greatly improved. Assuming that the monitoring time for each stroke is 8 seconds, the monitoring time required to complete 6 strokes is 48 seconds, and the total monitoring time of the system is set to 55 seconds, if the progressive distributor does not complete the specified number of strokes within this time, the system will issue an alarm signal; it can monitor the working status of the distributor in real time to ensure that it operates according to the scheduled task. If there is a work delay or failure, the alarm function can immediately remind the operator to check and repair, effectively preventing the system from causing equipment failure due to untimely or inaccurate lubrication. The liquid level switch monitors the liquid level of the main station tank. When the lubricant level in the tank drops to 1 / 3, the liquid level switch will issue an alarm signal. This monitoring method can ensure that the system is always in a state of sufficient lubricating oil supply, preventing oil supply interruption or uneven oil-gas mixing due to too low tank liquid level. If the tank liquid level is lower than the minimum level, the liquid level switch will issue a fault signal and prompt the operator through a red signal light that the system has a fault. At this time, the system will stop running and must be refilled with the specified amount of oil to resume normal operation, thus effectively avoiding system failure or damage caused by an empty oil tank. The pressure switch and the pressure reducing valve jointly set the operating pressure of the compressed air to ensure that the system operates under normal pressure. If the compressed air pressure is lower than 2 bar, the pressure switch will send a fault signal and the system will automatically stop running. This function ensures that the lubrication effect of the system is not affected by the fluctuation of the compressed air pressure, and avoids insufficient lubricating oil supply or uneven lubrication due to insufficient air pressure.

[0068] In summary, after reading the present invention document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical scheme and technical concept of the present invention without creative mental work, which all fall within the scope of protection of the present invention.

Claims

1. A rolling mill oil-gas lubrication control method with fixed cycle and variable stroke, characterized in that: It includes an oil-gas lubrication system, which includes a hydraulic main station, a hydraulic substation, a primary oil-gas distributor and a secondary oil-gas distributor; Adjustment of oil quantity by variable stroke control in fixed period: the progressive distributor distributes the oil evenly or proportionally, and the solenoid valve controls the total oil supply and oil supply cycle by controlling the oil pumping times of the progressive distributor; Set up the PLC program of the electronic control system to control the oil supply of the entire oil and gas lubrication system; Monitor the working status of the progressive distributor.

2. The method for controlling oil-gas lubrication of a rolling mill with a fixed period and variable stroke according to claim 1, characterized in that: The oil-gas lubrication system also includes an oil supply and oil quantity distribution unit, an air supply unit, an oil-gas mixing unit, an oil-gas flow monitoring unit, and an oil-gas transmission and electronic control device.

3. The method for controlling oil-gas lubrication of a rolling mill with a fixed period and variable stroke according to claim 2, characterized in that: The hydraulic substation includes an oil distribution unit, a compressed air processing unit and an oil-gas mixing unit.

4. The method for controlling oil-gas lubrication of a rolling mill with a fixed period and variable stroke according to claim 3, characterized in that: The compressed air processing device comprises a stop valve, an air filter, an electromagnetic reversing valve, a pressure reducing valve, a pressure switch and a pressure gauge.

5. The method for controlling oil-gas lubrication of a rolling mill with a fixed period and variable stroke according to claim 1, characterized in that: The adjustment of the fixed-cycle variable stroke control oil volume includes the following steps: With the oil supply cycle as the X-axis and the oil supply amount as the Y-axis, the oil supply amount per unit time U=X*Y, where Y=number of strokes i*oil supply amount per single stroke J, we can get U=X*I*J, where J is regarded as a constant.

6. A rolling mill oil-gas lubrication control method with fixed period and variable stroke according to claim 5, characterized in that: After the oil supply cycle X is processed by the control system, the upstream reversing solenoid valve of the progressive distributor is controlled to start periodically. The stroke number i is converted into a comparison number of the internal comparator of the system after being processed by the control system. This number is compared with the count value of the induction signal sent by the proximity switch installed on the distributor when the progressive distributor is working. When the count value is equal to the comparison number, the control system controls the reversing solenoid valve to close and the system stops supplying oil.

7. A rolling mill oil-gas lubrication control method with fixed period and variable stroke according to claim 6, characterized in that: After the system is initially started, the internal timer starts counting down at the time set by the oil supply cycle X. When the countdown ends, the control reversing solenoid valve is turned on, and the progressive distributor starts to supply oil. When the number of working strokes of the progressive distributor reaches the set number of strokes I, the system controls the reversing solenoid valve to be disconnected and the oil supply is stopped. The internal timer repeats the countdown at the time set by the oil supply cycle X, and the above process is repeated.

8. The method for controlling oil-gas lubrication of a rolling mill with a fixed period and variable stroke according to claim 1, characterized in that: The PLC program of the electronic control system controls the oil supply of the entire oil-gas lubrication system, including setting a corresponding working screen on the human-machine interface or the machine-side HMI for remote mode start / shutdown of the oil-gas lubrication system and displaying the working status of the oil-gas lubrication system.

9. The method for controlling oil-gas lubrication of a rolling mill with a fixed period and variable stroke according to claim 1, characterized in that: The monitoring of the working state of the progressive distributor comprises the following steps: a total monitoring time is set, and the progressive distributor must complete a specified number of strokes within the total monitoring time after receiving a working instruction, otherwise an alarm signal is issued.

10. A rolling mill oil-gas lubrication control method with fixed cycle and variable stroke according to claim 9, characterized in that: The liquid level of the main station oil tank is monitored by a liquid level switch. When the lubricant in the tank is lower than the preset value, the liquid level switch sends an alarm signal.

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