Safe lubricant filling device and control system and control method thereof

Abstract

The embodiment of the invention provides a safe lubricant filling device and a control system and method thereof, and belongs to the technical field of transmission devices. The safe lubricant filling device comprises a pneumatic part which comprises an air cylinder and a first piston part arranged in the air cylinder, and the first piston part comprises a piston rod penetrating through the top and the bottom of the air cylinder and a piston plate fixedly arranged on the piston rod in a sleeving mode; a second piston part is arranged at the top of the oil tank, is fixedly connected with the piston rod through a connecting rod and is arranged below the air cylinder; when the piston plate moves downwards under the action of pressure difference between the upper surface and the lower surface, the piston rod pushes the second piston part to move downwards to compress the lubricant for filling; and the decentralized control part is used for controlling the stroke of the first piston part according to different filling requirements of different to-be-lubricated equipment so as to enable the second piston part to press the lubricant into the to-be-lubricated equipment according to the filling requirements. According to the safe lubricant filling device, lubricant filling is automatically controlled, and the multi-equipment filling efficiency and filling quality are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of transmission devices for lubricant delivery, and in particular relates to a lubricant safety filling device and a control system and a control method thereof. Background Art

[0002] In the chemical industry, due to the complicated process flow, a variety of equipment are operated in conjunction. For example, motors, compressors, drying equipment, filtration equipment, distillation equipment, etc. need to be regularly and quantitatively filled with lubricants (lubricating oil, grease, etc.) according to the requirements of safe and efficient operation of the equipment. Lubricants are usually used for lubrication and maintenance of friction transmission parts (such as valve bodies, bearings, etc.) in mechanical equipment, as well as gap filling and rust prevention treatment on metal surfaces. If the equipment lacks lubricants during operation, it will cause dry wear damage to the friction parts, which will not only affect the normal operation of the equipment, but also bring many safety hazards.

[0003] Especially in the field of chemical PTA (terephthalic acid) manufacturing, with the continuous expansion of production capacity, the loading capacity of various equipment in the process flow is also increasing. Generally, the use of large and super-large dryers can effectively improve production efficiency, but the volume of transmission parts in such large equipment is also gradually increasing. For example, the average diameter of the gear mechanism in the super-large dryer exceeds 2 meters. In this case, it is necessary to pay attention to the filling of lubricants in real time, set up a reasonable lubricant filling process according to the requirements of important transmission parts in the equipment for lubricants, and accurately complete the lubricant filling process according to the process. At present, most of the lubricant filling of linkage operation equipment in the production process is still in the technical stage of manual control and manual filling, which leads to increased manpower input costs and low production efficiency. In terms of manual control, special personnel are required to monitor the different requirements of various equipment for lubricant filling and formulate a reasonable filling process. In terms of lubricant filling technology, manual hydraulic pumps are usually used to manually complete lubricant filling, and the filling quality is difficult to guarantee and the filling efficiency is low. It can be seen that traditional manual operation methods and traditional filling devices can no longer adapt to manufacturing production with high production capacity requirements.

[0004] In view of this, a new type of lubricant safety filling device and its control system and control method are needed to solve the above problems in whole or in part. Summary of the invention

[0005] In order to solve at least one aspect of the above-mentioned problems and defects in the prior art, the embodiments of the present invention provide a lubricant safety filling device and its control system and control method, which realizes integrated management and automatic control by connecting the pneumatic structure and the lubricant storage tank via a piston structure and integrating a distributed control system to provide lubricants that meet the filling requirements of different lubricated equipment, thereby improving the efficiency and quality of lubricant filling for multiple equipment. The technical solution is as follows:

[0006] According to one aspect of an embodiment of the present invention, a lubricant safety filling device is provided. The lubricant safety filling device comprises:

[0007] The pneumatic part includes a cylinder and a first piston part arranged in the cylinder, and the first piston part includes a piston rod penetrating the top and bottom of the cylinder and a piston plate fixedly sleeved on the piston rod.

[0008] The oil tank stores lubricant inside, and a second piston part is arranged on the top of the oil tank. The second piston part is fixedly connected with the piston rod of the first piston part through a connecting rod and is arranged below the cylinder.

[0009] When the piston plate of the first piston part moves downward under the action of the pressure difference between the upper and lower surfaces thereof, the piston rod of the first piston part pushes the second piston part to move downward to compress the lubricant for filling.

[0010] The distributed control unit controls the stroke of the first piston unit according to different filling requirements of different lubricated equipment so that the second piston unit presses the lubricant into different lubricated equipment according to different filling requirements.

[0011] In some embodiments, further, the first piston part also includes a position feedback device, which includes a magnetostrictive rod arranged inside the piston rod, a feedback magnetic ring sleeved on one end of the magnetostrictive rod close to the piston plate, and a magnetostrictive detection transmitter connected to the magnetostrictive rod. When the piston plate moves, the feedback magnetic ring moves with the piston plate, the magnetostrictive rod transmits a magnetic field pulse to the magnetostrictive detection transmitter, and the magnetostrictive detection transmitter obtains the position of the feedback magnetic ring and converts the position of the feedback magnetic ring into an electrical signal and outputs it to the distributed control unit.

[0012] In some embodiments, the lubricant safety filling device further includes a gas supply control unit, which includes a first gas control amplifier connected to a first pneumatic chamber formed by an upper surface of the piston plate and the cylinder, and a second gas control amplifier connected to a second pneumatic chamber formed by a lower surface of the piston plate and the cylinder.

[0013] In some embodiments, specifically, the first gas-controlled amplifier and the second gas-controlled amplifier are respectively connected to the decentralized control unit signal. After the gas source enters the first gas-controlled amplifier, the gas of the first gas delivery volume is delivered to the first pneumatic chamber according to the control signal of the decentralized control unit. After the gas source enters the second gas-controlled amplifier, the gas of the second gas delivery volume is delivered to the second pneumatic chamber according to the control signal of the decentralized control unit.

[0014] In some embodiments, further, a water collecting part and a water detector are provided at the bottom of the oil tank. The water collecting part is provided on the inner bottom surface of the oil tank, and the water collecting part has a protruding structure protruding upward at the center position, and the outer surface of the protruding structure forms a water collecting groove with the side wall of the oil tank. The water detector is a microwave detector, which is provided at the bottom of the oil tank near the water collecting groove and is connected to the signal of the distributed control part.

[0015] In some embodiments, further, the oil tank also includes an oil pipe and an oil pressure transmitter disposed on the oil pipe, and the oil pressure transmitter is signal-connected to the distributed control unit.

[0016] In some embodiments, further, the oil tank also includes at least two oil distribution pipes and a solenoid valve and a flow meter arranged on each of the at least two oil distribution pipes.

[0017] In some embodiments, specifically, the output end of the oil delivery pipe is connected to the input end of each oil distribution pipe after passing through the oil pressure transmitter. The output end of each oil distribution pipe is connected to the corresponding lubricant filling port in different lubricated equipment after passing through the solenoid valve and the flow meter. The solenoid valve and the flow meter are respectively connected to the distributed control unit signal.

[0018] In some embodiments, specifically, the second piston portion includes a piston disc and at least one sealing ring sleeved on the piston disc. Further, at least one groove is provided on the circumferential surface of the piston disc, and each sealing ring of the at least one sealing ring is nested in the corresponding groove of the at least one groove. Alternatively, a circumferential elastic member is provided inside each sealing ring.

[0019] In some embodiments, specifically, the decentralized control unit includes a first positioner connected to the gas delivery control unit signal and a second positioner connected to the position feedback device signal. The first positioner is connected to the signal processor of the decentralized control unit to send the pressure signal of the first pneumatic chamber and the second pneumatic chamber of the cylinder. The second positioner is connected to the signal processor of the decentralized control unit to send the position signal of the piston plate of the first piston unit.

[0020] In some embodiments, further, the distributed control unit outputs a lubricant filling control signal to the gas control unit based on the received lubricant filling requirements, pressure signals and position signals for adjusting the pressure difference between the upper and lower surfaces of the piston plate to adjust the stroke of the first piston unit so that the second piston unit presses the lubricant into different equipment to be lubricated according to the lubricant filling requirements.

[0021] In some embodiments, specifically, the decentralized control unit further includes a monitor, which is connected to the water detector, oil pressure transmitter, solenoid valve and flow meter signal of the oil tank to receive the state parameters of lubricant storage and filling and send the state parameters to the signal processor of the decentralized control unit. The decentralized control unit outputs a monitoring signal and / or an alarm signal according to the state parameters.

[0022] According to another aspect of an embodiment of the present invention, a control system for safe filling of lubricant is provided, which is used to control the filling of lubricant according to the safe filling device of lubricant described in the above aspect. The control system comprises:

[0023] The management network module is configured to obtain the lubricant filling requirements of different equipment to be lubricated and coordinate the lubricant filling requirements of different equipment to be lubricated according to the filling time, filling cycle and filling amount to obtain the lubricant filling execution process of different equipment to be lubricated.

[0024] The monitoring network module is configured to monitor the stroke of the first piston part inside the pneumatic part and the state parameters of the lubricant inside the oil tank to obtain monitoring data.

[0025] The control network module is configured to output a lubricant filling control signal according to the lubricant filling execution process and monitoring data of different lubricated equipment.

[0026] The field network module is configured to receive a lubricant filling control signal and control the stroke of the first piston part inside the pneumatic part according to the lubricant filling control signal so that the second piston part inside the oil tank presses the lubricant into different lubricated equipment according to the lubricant filling execution process.

[0027] In some embodiments, specifically, the management network module is further configured to include a filling time manager and a filling amount manager. The filling time manager is configured to calculate and coordinate the lubricant filling time and lubricant filling cycle of different lubricated equipment according to the lubricant filling requirements of different lubricated equipment. The filling amount manager is configured to determine the total amount of lubricant in the oil tank, the amount of lubricant squeezed out each time, and the minimum liquid level of the lubricant to be replenished according to the lubricant filling requirements of different lubricated equipment.

[0028] In some embodiments, specifically, the monitoring network module is further configured to include a positioning unit, a monitoring unit, and a signal processing unit. The positioning unit is configured to obtain the pressure signal of the first pneumatic chamber and the second pneumatic chamber in the cylinder through the first positioner of the distributed control unit and to obtain the position signal of the piston plate of the first piston part in the cylinder through the second positioner of the distributed control unit. The monitoring unit is configured to obtain the state parameters of the lubricant storage and filling in the oil tank through the monitor of the distributed control unit. The signal processing unit is configured to exchange data with the positioning unit and the monitoring unit through the data communication bus and to exchange data with the management network module, the control network module, and the field network module.

[0029] According to another aspect of an embodiment of the present invention, a control method for safe filling of lubricant is provided, which is used to control a safe filling device of lubricant to fill lubricant into different lubricated equipment according to the control system described in the above aspects. The control method comprises:

[0030] The lubricant filling requirements of different equipment to be lubricated are obtained through the management network module, and the lubricant filling requirements of different equipment to be lubricated are coordinated according to the filling time, filling cycle and filling amount to obtain the lubricant filling execution process of different equipment to be lubricated.

[0031] The monitoring data is obtained by monitoring the stroke of the first piston part inside the pneumatic part and the state parameters of the lubricant inside the oil tank through the monitoring network module.

[0032] The control network module outputs a lubricant filling control signal according to the lubricant filling execution process and monitoring data of different equipment to be lubricated.

[0033] The field network module receives the lubricant filling control signal and controls the stroke of the first piston part inside the pneumatic part according to the lubricant filling control signal so that the second piston part inside the oil tank presses the lubricant into different lubricated equipment according to the lubricant filling execution process.

[0034] The lubricant safety filling device and the control system and control method thereof provided by the embodiments of the present invention have at least one or part of the following advantages:

[0035] (1) By integrating the first piston of the pneumatic part with the second piston of the oil tank through a connecting rod and connecting them to a distributed control system, the cylinder pressure is automatically controlled to control the piston stroke of the first piston, thereby automatically controlling the second piston to pressurize the lubricant and distribute it to different equipment to be lubricated, effectively improving the efficiency and quality of lubricant filling;

[0036] (2) By providing a magnetic induction position feedback device on the first piston part, the accurate detection of the piston position in the cylinder and the lubricant level in the oil tank can be improved, which helps to provide more accurate position data for the distributed control system and thus improve the precision and accuracy of automatic control;

[0037] (3) The position feedback device is set in the cylinder to effectively avoid direct contact between it and the lubricant in the oil tank, reduce the influence of lubricant contamination on the liquid level measurement, help to increase the service life of the device and reduce the maintenance cost of the device;

[0038] (4) By setting a gas control amplifier connected to the distributed control system signal between the gas source and the cylinder, the pressure and gas delivery volume of the upper and lower gas chambers of the piston plate in the cylinder can be automatically adjusted;

[0039] (5) By integrating a distributed control system into the mechanical structure of the lubricant safety filling device, centralized control and automatic filling of lubricants is achieved according to different lubricant filling requirements for different equipment to be lubricated, effectively solving the problems of low manual operation efficiency and inability to monitor filling quality;

[0040] (6) By setting up management network modules, monitoring network modules, control network modules and field network modules in the distributed control system, integrated control of upper-level coordination and step-by-step distributed control is achieved, which enables efficient and accurate lubricant filling at a fixed time, fixed quantity and fixed period according to the lubricant filling requirements of different equipment to be lubricated;

[0041] (7) By setting a water collection part and a water detector at the bottom of the oil tank, the water content of the lubricant during the use of the lubricated equipment can be effectively detected. When the water content exceeds the standard, the water can be drained immediately to avoid the lubricant pressed into the lubricated equipment from exceeding the standard and damaging the equipment, thereby ensuring the safety of equipment operation and reducing safety risks;

[0042] (8) By arranging a sealing ring with an elastic member on the piston disk of the second piston part, the sealing of the oil tank is effectively ensured to prevent leakage or overflow of the lubricant;

[0043] (9) The cylinder and the oil tank are connected by a piston. The mechanical structure is simple and can be customized according to the equipment to be lubricated or production requirements. The overall device is easy to install and is generally applicable to various process flows in the chemical manufacturing field. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] These and / or other aspects and advantages of the present invention will become apparent and readily understood from the following description of the preferred embodiments in conjunction with the accompanying drawings, in which:

[0045] Figure 1 It is a structural schematic diagram of a lubricant safety filling device according to an embodiment of the present invention;

[0046] Figure 2 for Figure 1 An enlarged structural schematic diagram of a first piston portion in a pneumatic portion of a lubricant safety filling device shown;

[0047] Figure 3 A schematic diagram of a lubricant safety filling control system according to another embodiment of the present invention;

[0048] Figure 4 for Figure 3 A schematic diagram of a monitoring network module in the control system shown;

[0049] Figure 5 A schematic diagram of a lubricant filling process for a lubricated device according to another embodiment of the present invention;

[0050] Figure 6 In accordance with Figure 5 The illustrated embodiment is a flow chart of a control process executed by a field network module during a lubricant filling process. DETAILED DESCRIPTION

[0051] The technical solution of the present invention is further specifically described below by examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation of the present invention.

[0052] The chemical industry has a large number of interlocking equipment due to the complex process flow. For common mechanical equipment, the lubricant filling process is one of the important links to ensure the normal operation of the equipment and production safety. Especially in the field of chemical PTA (terephthalic acid) manufacturing, with the continuous expansion of production capacity, the loading capacity of various equipment in the process flow is also increasing. This requires efficient and accurate real-time attention to the lubricant filling situation, especially the need to arrange a reasonable lubricant filling process according to the lubricant requirements of the important transmission parts in the lubricated equipment and accurately complete the lubricant filling work according to the process.

[0053] Therefore, the present invention proposes a lubricant safety filling device and its control system and control method, which realizes integrated management and automatic control by connecting the pneumatic structure and the lubricant storage tank via a piston structure and integrating a distributed control system to provide lubricants that meet the filling requirements of different equipment to be lubricated, thereby improving the efficiency and quality of lubricant filling for multiple equipment and promoting safe production.

[0054] See also Figure 1, shows a lubricant safety filling device 100 provided according to one aspect of an embodiment of the present invention. The lubricant safety filling device 100 is mainly composed of four main parts, namely, a pneumatic part 10, an oil tank 20, a gas transmission control part 30 and a distributed control part 40.

[0055] The pneumatic part 10 and the oil tank 20 storing lubricant are mechanically connected together to form a mechanical structural unit of the lubricant safety filling device 100. Specifically, the pneumatic part 10 is arranged above the oil tank 20, the first piston part 11 is arranged inside the pneumatic part 10, the second piston part 22 is arranged on the top of the oil tank 20, and the first piston part 11 and the second piston part 22 are connected by a connecting rod 23. At this time, the first piston part 11 can drive the second piston part 22 to move up and down when it moves up and down in the pneumatic part 10, and when the second piston part 22 moves downward, the lubricant in the oil tank 20 can be pressed and sent into the lubricated equipment through the oil pipe 26.

[0056] The input end of the gas supply control unit 30 is connected to the output end of the gas source (supplying gas to the pneumatic unit 10), and the output end of the gas supply control unit 30 is pneumatically connected to the pneumatic unit 10, so as to deliver the gas from the gas source into the interior of the pneumatic unit 10 to push the first piston unit 11 to move up and down inside the pneumatic unit 10.

[0057] The distributed control unit 40 controls the mechanical structure unit composed of the pneumatic unit 10 and the oil tank 20 through the distributed control system 200. At the same time, the pneumatic unit 10 and the oil tank 20 are electrically connected and / or communicated with the distributed control unit 40 respectively. In addition, the gas transmission control unit 30 has both pneumatic and electrical and / or communication connections with the distributed control unit 40. The distributed control unit 40 controls the stroke of the first piston unit 11 according to the different filling requirements of different lubricated equipment so that the second piston unit 22 presses the lubricant into the corresponding different lubricated equipment according to the different filling requirements of different lubricated equipment.

[0058] In one example, specifically, see Figure 2 , showing a partially enlarged structure of the pneumatic part 10, combined with Figure 1 and Figure 2 As shown, the pneumatic part 10 includes a cylinder 12 and a first piston part 11 disposed in the cylinder 12. The first piston part 11 further includes a piston rod 111 that passes through the top and bottom of the cylinder 12 and a piston plate 112 that is fixedly sleeved on the piston rod 111. When the piston plate 112 of the first piston part 11 moves downward under the action of the pressure difference between its upper and lower surfaces, the piston rod 111 of the first piston part 11 pushes the second piston part 22 of the oil tank 20 to move downward to compress the lubricant for filling.

[0059] In one example, further, Figure 2As shown, the first piston part 11 of the pneumatic part 10 also includes a position feedback device 113. Specifically, the position feedback device 113 includes a magnetostrictive rod 1131 disposed inside the piston rod 111, a feedback magnetic ring 1132 sleeved on one end of the magnetostrictive rod 1131 close to the piston plate 112, and a magnetostrictive detection transmitter 1133 connected to the magnetostrictive rod 1131. When the piston plate 112 moves up and down, the feedback magnetic ring 1132 moves with the piston plate 112. At this time, the magnetostrictive rod 1131 transmits a magnetic field pulse to the magnetostrictive detection transmitter 1133, and the magnetostrictive detection transmitter 1133 obtains the position of the feedback magnetic ring 1132 and converts the position of the feedback magnetic ring 1132 into an electrical signal and outputs it to the distributed control unit 40.

[0060] The working principle of the position feedback device 113 is based on the magnetostrictive principle. Specifically, the magnetostrictive rod 1131 and the feedback magnetic ring 1132 generate two different magnetic fields respectively. During the process of filling the lubricant, the two different magnetic fields change in real time with the up and down movement of the first piston part 11. The intersection of these two different magnetic fields will generate a strain pulse signal. The position or displacement can be accurately measured by identifying the strain pulse signal through the magnetostrictive detection transmitter 1133, for example, measuring the position of the piston plate 112 of the first piston part 11 in the cylinder 12, and for example, the position of the second piston part 22 can be calculated based on the mechanical structure parameters of the first piston part 11 and the second piston part 22 through the measured position of the piston plate 112, and the lubricant level in the oil tank 20 can be calculated in combination with the electrical signal.

[0061] In one example, preferably, the magnetostrictive rod 1131 can be made by placing a magnetic sensitive element in a waveguide tube, wherein the magnetic sensitive element is made of a special magnetostrictive material. The magnetostrictive detection transmitter 1133 plays the role of detecting magnetic signals and converting magnetic signals into electrical signals. Usually, an electronic chamber is provided in the magnetostrictive detection transmitter 1133 for generating current pulses, and the current pulses are continuously released at a preset period during the lubricant filling process through electrical connection control. The current pulse is transmitted in the waveguide tube of the magnetostrictive rod 1131, thereby generating a circumferential magnetic field outside the waveguide tube. At the same time, the feedback magnetic ring 1132 will also generate another magnetic field during the up and down movement of the piston plate 112. When the magnetic field of the magnetostrictive rod 1131 intersects with the magnetic field of the feedback magnetic ring 1132, due to the magnetostrictive effect, a strain mechanical wave pulse signal will be generated in the magnetostrictive rod 1131, and this strain mechanical wave pulse signal is transmitted back to the magnetostrictive detection transmitter 1133 at a fixed speed. Since the transmission time of the strain mechanical wave pulse signal in the magnetostrictive rod 1131 is proportional to the distance between the feedback magnetic ring 1132 and the magnetostrictive detection transmitter 1133, the distance can be accurately calculated by measuring the transmission time, and the real-time specific position of the piston plate 112 can be obtained. Since the strain mechanical wave pulse signal is an absolute value signal that can express the displacement rather than a proportional relative value or an amplified signal, there is no signal drift or value change, which not only improves the measurement accuracy of the position or displacement, but also reduces the work of device maintenance and calibration, thereby improving the overall work efficiency of the lubricant safety filling device 100.

[0062] In one example, alternatively, a through hole is drilled inside the piston rod 111 of the first piston part 11, and then the magnetostrictive rod 1131 (including the external waveguide and the magnetic sensitive element arranged inside the waveguide) is installed inside the piston rod 111 through the through hole. At the same time, the feedback magnetic ring 1132 is fixed on the piston plate 112. Figure 2 As shown, preferably, a fixing groove is provided on the upper surface of the piston plate 112 (the upper surface in the figure is the surface of the raised portion of the piston rod 111), and the feedback magnetic ring 1132 is placed in the fixing groove. It can be understood by those skilled in the art that the above-mentioned threaded connection method is only an illustrative example, and other mature mechanical assembly methods can also be used. Therefore, this example is only an illustrative example, and those skilled in the art should not understand it as a limitation of the present invention.

[0063] When the piston plate 112 of the first piston part 11 moves up and down, the feedback magnetic ring 1132 moves with the piston plate 112, and the magnetostrictive rod 1131 senses the position of the feedback magnetic ring 1132 through magnetic field cross-sensing and transmits the mechanical wave pulse signal back to the magnetostrictive detection transmitter 1133. The magnetostrictive detection transmitter 1133 converts the mechanical wave pulse signal into the stroke position of the first piston part 11 and forms a 4-20mA electrical signal to be transmitted to the control system 200.

[0064] In the control system 200, the stroke information of the first piston part 11 is fed back and transmitted through the distributed control unit 40. On the other hand, the distributed control unit 40 receives the control command output by the control system 200 according to the lubricant filling requirements of the lubricated equipment and the real-time status parameters of the lubricant safety filling device 100 to adjust the stroke of the first piston part 11, and calculates the liquid level of the lubricant in the oil tank 20 according to the real-time status parameters fed back to the control system 200 by the second piston part 22 during the filling process. Due to the use of the magnetic induction position feedback device 113, the calculated lubricant liquid level accuracy can reach the millimeter level.

[0065] In one example, alternatively, the magnetostrictive detection transmitter 1133 can be fixedly installed with the top of the cylinder 12 by setting a threaded connector. Alternatively, in order to ensure the gap sealing between the piston plate 112 and the inner wall of the cylinder 12, at least one sealing ring 1121 is also embedded in the circumferential direction of the piston plate 112, for example, two sealing rings 1121 are preferably provided. The selection or design of the sealing ring 1121 can be matched and designed according to the specific structure of the cylinder 12 and the first piston part 11 of the pneumatic part 10. This example is only an illustrative example, and those skilled in the art should not be understood as a limitation of the present invention.

[0066] In one example, specifically, in conjunction with Figure 1 and Figure 2 As shown, the piston plate 112 of the first piston part 11 divides the interior of the cylinder 12 into two spaces, namely, the first pneumatic chamber 13 (the space formed by the upper surface of the piston plate 112 and the interior of the cylinder 12) and the second pneumatic chamber 14 (the space formed by the lower surface of the piston plate 112 and the interior of the cylinder 12). Correspondingly, the gas supply control unit 30 includes a first gas control amplifier 31 connected to the first pneumatic chamber 13 and a second gas control amplifier 32 connected to the second pneumatic chamber 14. At the same time, the first gas control amplifier 31 and the second gas control amplifier 32 are respectively connected to the distributed control unit 40 by signal. After the gas source enters the first gas control amplifier 31, the gas of the first gas supply volume is delivered to the first pneumatic chamber 13 according to the first gas supply drive signal of the distributed control unit 40. After the gas source enters the second gas control amplifier 32, the gas of the second gas supply volume is delivered to the second pneumatic chamber 14 according to the second gas supply drive signal of the distributed control unit 40.

[0067] In one example, alternatively, a filter unit 50 is further provided between the gas source output end and the gas input end of the gas supply control unit 30. Specifically, a first filter 51 is provided on the gas supply pipe where the gas source enters the first gas control amplifier 31, and a second filter 52 is provided on the gas supply pipe where the gas source enters the second gas control amplifier 32, for filtering impurities and / or moisture that may exist in the gas source, so as to prevent the impurities and / or moisture from entering the cylinder 12 to affect the movement of the first piston part 11 or damage the surface structure of the first piston part 11.

[0068] In one example, specifically, Figure 1 As shown, the second piston part 22 is arranged on the top of the housing 21 of the oil tank 20, and the second piston part 22 includes a piston disc 221 and at least one sealing ring 222 sleeved on the piston disc 221. Further, in order to prevent the lubricant from leaking between the piston disc 221 and the inner wall of the oil tank 20, at least one groove (not shown) is arranged on the circumferential surface of the piston disc 221, and each sealing ring of the at least one sealing ring 222 is nested in the corresponding groove of the at least one groove. Alternatively, a circumferential elastic member (not shown) is arranged inside each sealing ring 222.

[0069] In one example, alternatively, the number of sealing rings 222 on the piston disc 221 is generally selected to be 2 or more. Preferably, considering that the piston disc 221 frequently moves up and down inside the oil tank 20 and is in direct contact with the lubricant, 2-3 sealing rings 222 are used for sealing.

[0070] In one example, alternatively, the sealing ring 222 uses a U-shaped sealing ring made of a soluble polytetrafluoroethylene (PFA) material, and the elastic member provided inside each U-shaped sealing ring can use a metal elastic ring, preferably a deformable nickel-based high-temperature alloy (Inconel) elastic ring. The Inconel elastic ring is provided as an elastic ring with a 3 / 4 circumference shape and is wrapped inside the sealing ring 222. By providing the elastic member, it can be ensured that the outer U-shaped sealing ring is always in full contact and sealed with the inner wall surface of the oil tank 20, thereby maintaining a suitable leakage pressure inside the oil tank 20, which is usually 20 bar.

[0071] In one example, specifically, a water collecting part 24 and a water detector 25 are further provided at the bottom of the oil tank 20. The water collecting part 24 is provided on the inner bottom surface of the oil tank 20, and the water collecting part 24 has a convex structure protruding upward at the center position, and the outer surface of the convex structure forms a water collecting groove 241 with the side wall of the shell 21 of the oil tank 20. The water detector 25 is a microwave detector, which is provided at the bottom of the oil tank 20 near the water collecting groove 241 and is connected to the distributed control part 40 by signal.

[0072] In one example, when the lubricant in the oil tank 20 generates water, such as condensed water, as the lubricant safety filling device 100 is operated to fill the lubricant, the water can be collected at the bottom of the oil tank 20 by the water collecting part 24. At the same time, the water content is detected and monitored by the water detector 25.

[0073] In one example, preferably, the water detector 25 uses a microwave detector, which utilizes the microwave absorption effect. The dielectric constants of the lubricant and water are different. When water with a high dielectric constant exists, the microwave will be absorbed. Therefore, the water content in the lubricant can be detected based on the microwave absorption amount. When the water content in the lubricant exceeds the standard, the drainage solenoid valve on the water detector 25 can be opened or the drainage solenoid valve arranged on the wall of the oil tank 20 can be linked to automatically drain the water until the detected water content meets the requirements. Those skilled in the art will understand that the device for moisture detection also includes other types, and a suitable water detector 25 can be used according to the actual design of the oil tank 20. Therefore, this example is only an illustrative example, and those skilled in the art should not be understood as a limitation of the present invention.

[0074] In one example, specifically, an oil delivery pipe 26 is further provided on the side wall of the housing 21 of the oil tank 20, and an oil pressure transmitter 261 is further provided on the oil delivery pipe 26, and the oil pressure transmitter 261 and the distributed control unit 40 form a closed-loop control circuit inside the control system 200. At least two oil distribution pipes 27 and a solenoid valve 271 and a flow meter 272 provided on each of the at least two oil distribution pipes 27 are also connected to the output end of the oil delivery pipe 26.

[0075] Furthermore, first, the output end of the oil delivery pipe 26 is connected to the input end of each of the at least two oil distribution pipes 27 after passing through the oil pressure transmitter 261. Then, the output end of each of the at least two oil distribution pipes 27 is connected to different lubricated equipment (e.g. Figure 1 The electromagnetic valves 271 and the flowmeters 272 are connected to the corresponding lubricant filling ports (not shown) in the devices 1, 2, ..., and N shown in the figure. All the electromagnetic valves 271 and the flowmeters 272 are respectively connected to the distributed control unit 40 by signals.

[0076] In one example, specifically, the oil pressure transmitter 261 on the oil delivery pipe 26 can realize the conversion of the oil pressure signal into a 4-20 mA electrical signal and transmit it to the control system 200 through the distributed control unit 40, and form a pressure closed-loop control together with the feedback electrical signal obtained by the distributed control unit 40 through other on-site electrical connection components (such as the gas delivery control unit 30, the magnetostrictive detection transmitter 1133, etc.). Generally, the pressure value of the output lubricant and the structure of the first piston part 11 and the second piston part 22 have the following relationship: P润滑剂 =P1*S1 / S2, where P1 represents the pressure value input to the first pneumatic chamber 13 via the first air control amplifier 31, S1 represents the cross-sectional area of ​​the piston plate 112 of the first piston part 11, and S2 represents the cross-sectional area of ​​the piston disc 221 of the second piston part 22. Therefore, when the cross-sectional area of ​​the piston disc 221 of the second piston part 22 remains unchanged, the pressure value of the lubricant output from the oil tank 20 can be increased by increasing the cross-sectional area of ​​the piston plate 112 of the first piston part 11.

[0077] In one example, specifically, the oil delivery pipe 26 is divided into several branches after passing through the oil pressure transmitter 261 to form at least two oil distribution pipes 27, and each oil distribution pipe 27 is responsible for filling lubricant to a certain lubricated equipment that needs to be filled with lubricant according to its filling requirements. Figure 1 As shown, the top oil distribution pipe 27 is connected to the lubricant filling port of device 1, and the second oil distribution pipe 27 is connected to the lubricant filling port of device 2, and so on. The bottom oil distribution pipe 27 is connected to the lubricant filling port of device N.

[0078] The solenoid valve 271 and the flow meter 272 on the oil distribution pipe 27 can automatically control the filling time, filling times, filling cycles, filling amount, etc. of the lubricant on site through the instructions issued by the control system 200. For example, the control system 200 notifies the solenoid valve 271 to open for filling or notifies the solenoid valve 271 to close and wait for the next filling according to the filling time. For another example, the control system 200 notifies the opening degree of the solenoid valve 271 according to the filling amount to ensure quantitative filling and notifies the flow meter 272 to monitor and feedback the actual flow of the lubricant filling.

[0079] In one example, alternatively, an oil filling hole 223 is further provided on the oil tank 20 for replenishing the lubricant when the control system 200 detects that the lubricant storage amount in the oil tank 20 is lower than the minimum storage amount. Preferably, the oil filling hole 223 is provided on the upper surface of the piston disk 221 of the second piston part 22.

[0080] See also Figure 3 , shows a control system 200 for safe filling of lubricant according to another aspect of an embodiment of the present invention. Figure 1 and Figure 3It can be seen that the decentralized control unit 40 is nested and integrated in the control system 200. The design principle of the control system 200 is based on decentralized control logic, which is a control method based on a microprocessor that uses decentralized control functions, centralized display operations, and takes into account decentralized, autonomous, and coordinated control of the system, especially the instruments in the system. Therefore, the control system 200 mainly adopts a decentralized control, centralized operation and management architecture, and combines a multi-level hierarchical, cooperative and autonomous specific structure to achieve centralized management and decentralized control.

[0081] Further, see Figure 4 , showing a schematic diagram of the integration of the distributed control unit 40 and the control system 200. Figure 3 and Figure 4 As shown, the control system 200 is mainly composed of four modules, namely, a management network module 210, a monitoring network module 220, a control network module 230 and a field network module 240. The distributed control unit 40 is mainly composed of four components, namely, a first positioner 41, a second positioner 42, a monitor 43 and a signal processor 44, and is integrated with the monitoring network module 220.

[0082] In one example, specifically, the management network module 210 is configured to obtain lubricant filling requirements of different equipment to be lubricated and coordinate the lubricant filling requirements of different equipment to be lubricated according to filling time, filling cycle and filling amount to obtain the lubricant filling execution process of different equipment to be lubricated.

[0083] In one example, the management network module 210 is further configured to include a filling time manager 211 and a filling amount manager 212. The filling time manager 211 is configured to calculate and coordinate the lubricant filling time and lubricant filling cycle of different lubricated equipment according to the lubricant filling requirements of different lubricated equipment. The filling amount manager 212 is configured to determine the total amount of lubricant in the oil tank, the amount of lubricant squeezed out each time, and the minimum liquid level of the lubricant to be replenished according to the lubricant filling requirements of different lubricated equipment.

[0084] In one example, specifically, the monitoring network module 220 is configured to monitor the stroke of the first piston part 11 inside the pneumatic part 10 and the state parameters of the lubricant inside the oil tank 20 to obtain monitoring data. Further, the monitoring network module 220 includes a positioning unit 221, a monitoring unit 222 and a signal processing unit 223. Among them, the positioning unit 221 is configured to obtain the pressure signal of the first pneumatic chamber 13 and the second pneumatic chamber 14 in the cylinder 12 and the position signal of the piston plate 112 of the first piston part 11 in the cylinder 12 (and the calculated lubricant level signal in the oil tank 20). The monitoring unit 222 is configured to obtain the state parameters of the storage and filling of the lubricant in the oil tank 20. The signal processing unit 223 is configured to exchange data with the positioning unit 221 and the monitoring unit 222 through the data communication bus and exchange data with the management network module 210, the control network module 230 and the field network module 240.

[0085] In one example, combining Figure 1 , Figure 3 and Figure 4 As shown, the distributed control unit 40 is a part that realizes communication connection with the mechanical structure unit of the lubricant safety filling device 100. Specifically, the distributed control unit 40 includes a first positioner 41 connected to the gas supply control unit 30 by signal and a second positioner 42 connected to the position feedback device 113 by signal. Among them, the first positioner 41 is connected to the signal processing unit 223 of the monitoring network module 220 through the signal processor 44 to send the pressure signal of the first pneumatic chamber 13 and the second pneumatic chamber 14 of the cylinder 12. Similarly, the second positioner 42 is connected to the signal processing unit 223 of the monitoring network module 220 through the signal processor 44 to send the position signal of the piston plate 112 of the first piston part 11.

[0086] Furthermore, the distributed control unit 40 outputs a lubricant filling control signal to the gas supply control unit 30 based on the lubricant filling requirement, pressure signal and position signal received from the control system 200 through the signal processing unit 223 of the monitoring network module 220, so as to adjust the pressure difference between the upper and lower surfaces of the piston plate 112 to adjust the stroke of the first piston unit 11 so that the second piston unit 22 presses the lubricant into different equipment to be lubricated according to the lubricant filling requirement.

[0087] In one example, the distributed control unit 40 also includes a monitor 43, which is signal-connected to the water detector 25, the oil pressure transmitter 261, the solenoid valve 271 and the flow meter 272 of the oil tank 20 for receiving state parameters of lubricant storage and filling and sending the state parameters to the signal processor 44 of the distributed control unit 40, and the distributed control unit 40 outputs a monitoring signal and / or an alarm signal based on the state parameters.

[0088] In one example, specifically, the control network module 230 is configured to output a lubricant filling control signal according to the lubricant filling execution process and monitoring data of different equipment to be lubricated.

[0089] In one example, further, the control network module 230 includes a process controller 231 and a data collector 232. Alternatively, the process controller 231 may use a master process controller, or may use several distributed process controllers. Alternatively, when several distributed process controllers are used, it is also possible to choose to use a parallel-associated process controller group or a hierarchical process controller group through the design of the control logic. Generally, when the installed capacity of the equipment to be lubricated is large and the number is small, two or more parallel-associated process controllers at the same level can be used, which helps to simplify the control process and improve the efficiency of lubricant filling. When the number of equipment to be lubricated is large, several hierarchical process controllers can be used, which helps to manage different equipment to be lubricated in a hierarchical manner according to their lubricant filling requirements. Compared with horizontal management, it is more beneficial to improve the adaptability of the control process and thus improve the efficiency and quality of lubricant filling.

[0090] In one example, specifically, the field network module 240 is configured to receive a lubricant filling control signal and control the stroke of the first piston portion 11 inside the pneumatic portion 10 according to the lubricant filling control signal so that the second piston portion 22 inside the oil tank 20 presses the lubricant into different equipment to be lubricated according to the lubricant filling execution process.

[0091] According to another aspect of an embodiment of the present invention, a control method for safe filling of lubricant is provided, the control method comprising the following specific steps:

[0092] Step S100: obtaining lubricant filling requirements of different lubricated equipment through the management network module 210 and coordinating the lubricant filling requirements of different lubricated equipment according to filling time, filling cycle and filling amount to obtain the lubricant filling execution process of different lubricated equipment.

[0093] Step S200: The monitoring network module 220 monitors the stroke of the first piston part 11 inside the pneumatic part 10 and the state parameters of the lubricant inside the oil tank 20 to obtain monitoring data.

[0094] Step S300: the control network module 230 outputs a lubricant filling control signal according to the lubricant filling execution process of different lubricated equipment obtained in step S100 and the monitoring data obtained in step S200.

[0095] Step S400: The field network module 240 receives the lubricant filling control signal of step S300 and controls the stroke of the first piston part 11 of the pneumatic part 10 according to the lubricant filling control signal so that the second piston part 22 inside the oil tank 20 presses the lubricant into different equipment to be lubricated according to the lubricant filling execution process of different equipment to be lubricated obtained in step S100.

[0096] In one example, a specific example is used to further illustrate the process of the control system 200 controlling the lubricant safety filling device 100 and the lubricant filling using the control method according to steps S100 to S400.

[0097] For example, the equipment to be lubricated includes equipment 1, equipment 2, equipment 3 and equipment 4. Different equipment has different filling requirements for lubricant, among which: equipment 1 requires lubricant filling every 2 hours, with a filling amount of 50 L each time; equipment 2 requires lubricant filling every 5 hours, with a filling amount of 150 L each time; equipment 3 requires lubricant filling every 1 hour, a total of 5 times during one continuous operation, and the filling amount increases gradually each time, and the specific filling amounts are 30 L, 50 L, 80 L, 100 L and 130 L respectively; equipment 4 requires lubricant filling once at a predetermined time point (operating for 6 hours), with a filling amount of 100 L.

[0098] According to step S100 , the management network module 210 in the control system 200 collects the lubricant filling requirements of the devices 1 to 4 and comprehensively plans the lubricant filling execution process that meets the requirements of the devices 1 to 4 through the filling time manager 211 and the filling amount manager 212 .

[0099] See also Figure 5, schematically showing the lubricant filling execution process. Specifically, the operation time of the entire equipment (equipment 1-equipment 4 integrated in a process production process) is set to 10 hours. The specific lubricant filling execution process can be: replenish lubricant once before the entire equipment is started, and count the time through the filling time manager 211 after the entire equipment is started. When the time process increases by 1 hour, the filling time manager 211 sends a filling start signal and the filling amount manager 212 sends a filling amount signal to the control network module 230 according to the lubricant filling requirements of equipment 1-equipment 4. Then, the process controller 231 of the control network module 230 sends a control instruction (lubricant filling control signal) to the monitoring network module 220 and the distributed control unit 40 integrated with the monitoring network module 220. Finally, signal communication is performed with the field network module 240 through the distributed control unit 40. The field network module 240 receives the lubricant filling control signal and controls the stroke of the first piston part 11 of the pneumatic part 10 according to the lubricant filling control signal so that the second piston part 22 inside the oil tank 20 presses the lubricant into different equipment to be lubricated according to the lubricant filling execution process.

[0100] See also Figure 6 , showing that when the field network module 240 receives the lubricant filling control signal sent by the control network module 230 through the distributed control unit 40, it realizes the lubricant filling control of the equipment 1-equipment 4 according to Figure 5 The lubricant filling execution process shown completes the control flow chart of lubricant filling. First, after starting the lubricant safety filling device 100 and its control system 200, it is necessary to perform a system self-check to check the lubricant liquid level, lubricant water content, the pressure of the first air chamber 13 and the second air chamber 14 in the pneumatic part 10, and the status of the oil pressure transmitter 261, the solenoid valve 271 and the flow meter 272 of the oil tank 20. After that, after determining the output pressure of the gas source, the monitoring network module 220 of the control system 200 and the linkage distributed control unit 40 can monitor and control the output of the lubricant inside the oil tank 20 in the oil pipe 26 (through the oil pressure transmitter 261) and the oil distribution pipe 27 (through the solenoid valve 271 and the flow meter 272).

[0101] In one example, alternatively, a display device (not shown) may be connected to the control system 200 to display, for example, Figure 1-Figure 6 The system structure diagram, logic control diagram, flow chart, etc. in the control system 200 are intuitively displayed to the on-site operators or inspectors. Quick operation buttons can also be set on the display device to perform on-site adjustments or equipment start and stop operations. The above specific examples are only used to illustrate the specific control process of the control system 200 and the specific implementation process of the control method, and those skilled in the art should not be understood as a limitation of the present invention.

[0102] The lubricant safety filling device and the control system and control method thereof provided by the embodiments of the present invention have at least one or part of the following advantages:

[0103] (1) By integrating the first piston of the pneumatic part with the second piston of the oil tank through a connecting rod and connecting them to a distributed control system, the cylinder pressure is automatically controlled to control the piston stroke of the first piston, thereby automatically controlling the second piston to pressurize the lubricant and distribute it to different equipment to be lubricated, effectively improving the efficiency and quality of lubricant filling;

[0104] (2) By providing a magnetic induction position feedback device on the first piston part, the accurate detection of the piston position in the cylinder and the lubricant level in the oil tank can be improved, which helps to provide more accurate position data for the distributed control system and thus improve the precision and accuracy of automatic control;

[0105] (3) The position feedback device is set in the cylinder to effectively avoid direct contact between it and the lubricant in the oil tank, reduce the influence of lubricant contamination on the liquid level measurement, help to increase the service life of the device and reduce the maintenance cost of the device;

[0106] (4) By setting a gas control amplifier connected to the distributed control system signal between the gas source and the cylinder, the pressure and gas delivery volume of the upper and lower gas chambers of the piston plate in the cylinder can be automatically adjusted;

[0107] (5) By integrating a distributed control system into the mechanical structure of the lubricant safety filling device, centralized control and automatic filling of lubricants is achieved according to different lubricant filling requirements for different equipment to be lubricated, effectively solving the problems of low manual operation efficiency and inability to monitor filling quality;

[0108] (6) By setting up management network modules, monitoring network modules, control network modules and field network modules in the distributed control system, integrated control of upper-level coordination and step-by-step distributed control is achieved, which enables efficient and accurate lubricant filling at a fixed time, fixed quantity and fixed period according to the lubricant filling requirements of different equipment to be lubricated;

[0109] (7) By setting a water collection part and a water detector at the bottom of the oil tank, the water content of the lubricant during the use of the lubricated equipment can be effectively detected. When the water content exceeds the standard, the water can be drained immediately to avoid the lubricant pressed into the lubricated equipment from exceeding the standard and damaging the equipment, thereby ensuring the safety of equipment operation and reducing safety risks;

[0110] (8) By arranging a sealing ring with an elastic member on the piston disk of the second piston part, the sealing of the oil tank is effectively ensured to prevent leakage or overflow of the lubricant;

[0111] (9) The cylinder and the oil tank are connected by a piston. The mechanical structure is simple and can be customized according to the equipment to be lubricated or production requirements. The overall device is easy to install and is generally applicable to various process flows in the chemical manufacturing field.

[0112] Although some embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept, the scope of which is defined by the claims and their equivalents.

Claims

1. A lubricant safety filling device, characterized in that: The lubricant safety filling device comprises: A pneumatic part, the pneumatic part includes a cylinder and a first piston part arranged in the cylinder, the first piston part includes a piston rod passing through the top and bottom of the cylinder and a piston plate fixedly sleeved on the piston rod; An oil tank, wherein lubricant is stored in the oil tank, a second piston part is arranged on the top of the oil tank, and the second piston part is fixedly connected to the piston rod through a connecting rod and arranged below the cylinder; When the piston plate moves downward under the action of the pressure difference between the upper and lower surfaces, the piston rod pushes the second piston part to move downward to compress the lubricant for filling; A distributed control unit controls the stroke of the first piston unit according to different filling requirements of different lubricated equipment so that the second piston unit presses the lubricant into different lubricated equipment according to different filling requirements.

2. The lubricant safety filling device according to claim 1, characterized in that: The first piston part further includes a position feedback device, which includes a magnetostrictive rod arranged inside the piston rod, a feedback magnetic ring sleeved on one end of the magnetostrictive rod close to the piston plate, and a magnetostrictive detection transmitter connected to the magnetostrictive rod; When the piston plate moves, the feedback magnetic ring moves with the piston plate, and the magnetostrictive rod transmits the magnetic field pulse to the magnetostrictive detection transmitter. The magnetostrictive detection transmitter obtains the position of the feedback magnetic ring and converts the position of the feedback magnetic ring into an electrical signal and outputs it to the distributed control unit.

3. The lubricant safety filling device according to claim 2, characterized in that: The lubricant safety filling device also includes an air supply control unit, which includes a first air control amplifier connected to a first pneumatic chamber formed by the upper surface of the piston plate and the cylinder and a second air control amplifier connected to a second pneumatic chamber formed by the lower surface of the piston plate and the cylinder; The first gas-controlled amplifier and the second gas-controlled amplifier are respectively connected to the distributed control unit by signal; After the gas source enters the first gas-controlled amplifier, the gas of the first gas delivery volume is delivered to the first pneumatic chamber according to the control signal of the distributed control unit; After the gas source enters the second gas-controlled amplifier, the gas of the second gas delivery volume is delivered to the second pneumatic chamber according to the control signal of the distributed control unit.

4. The lubricant safety filling device according to any one of claims 1 to 3, characterized in that: A water collecting portion and a water detector are also provided at the bottom of the oil tank; The water collecting part is arranged on the inner bottom surface of the oil tank, and the water collecting part has a convex structure protruding upward at the center position, and the outer surface of the convex structure forms a water collecting groove with the side wall of the oil tank; The water detector is a microwave detector, which is arranged at the bottom of the oil tank near the water collecting tank and is connected to the distributed control unit by signal; An oil delivery pipe and an oil pressure transmitter arranged on the oil delivery pipe are also arranged on one side of the oil tank, and the oil pressure transmitter is connected to the distributed control unit by signal; At least two oil distribution pipes and a solenoid valve and a flow meter arranged on each of the at least two oil distribution pipes are also connected to the output end of the oil delivery pipe; The output end of the oil delivery pipe is connected to the input end of each oil distribution pipe after passing through the oil pressure transmitter; The output end of each oil distribution pipe is connected to the corresponding lubricant filling port in different lubricated equipment after passing through the solenoid valve and the flow meter; The solenoid valve and the flow meter are respectively connected to the distributed control unit by signal.

5. The lubricant safety filling device according to claim 4, characterized in that: The second piston part comprises a piston disc and at least one sealing ring sleeved on the piston disc; At least one groove is provided on the circumferential surface of the piston disc, and each sealing ring of the at least one sealing ring is nested in the corresponding groove of the at least one groove; A circumferential elastic member is arranged inside each sealing ring.

6. The lubricant safety filling device according to claim 5, characterized in that: The distributed control unit includes a first positioner connected to the gas delivery control unit connected to the pneumatic unit by signal and a second positioner connected to the position feedback device of the first piston unit by signal; The first positioner is connected to the signal processor of the decentralized control unit to send pressure signals of the first pneumatic chamber and the second pneumatic chamber of the cylinder; The second positioner is connected to the signal processor of the distributed control unit to send a position signal of the piston plate of the first piston unit; The distributed control unit outputs a lubricant filling control signal to the gas transmission control unit according to the received lubricant filling requirement, pressure signal and position signal, so as to adjust the pressure difference between the upper and lower surfaces of the piston plate to adjust the stroke of the first piston unit so that the second piston unit presses the lubricant into different lubricated equipment according to the lubricant filling requirement; The distributed control unit also includes a monitor, which is signal-connected to the water detector, oil pressure transmitter, solenoid valve and flow meter of the oil tank for receiving state parameters of lubricant storage and filling and sending the state parameters to the signal processor of the distributed control unit; The distributed control unit outputs a monitoring signal and / or an alarm signal according to the state parameter.

7. A control system for safe filling of lubricant, used in a safe filling device for lubricant according to any one of claims 1 to 6, characterized in that: The control system comprises: A management network module, wherein the management network module is configured to obtain lubricant filling requirements of different lubricated equipment and coordinate the lubricant filling requirements of the different lubricated equipment according to filling time, filling cycle and filling amount to obtain a lubricant filling execution process for different lubricated equipment; A monitoring network module, wherein the monitoring network module is configured to monitor the stroke of the first piston portion inside the pneumatic portion and the state parameters of the lubricant inside the oil tank to obtain monitoring data; A control network module, wherein the control network module is configured to output a lubricant filling control signal according to the lubricant filling execution process and the monitoring data; A field network module is configured to receive the lubricant filling control signal and control the stroke of the first piston part of the pneumatic part according to the lubricant filling control signal so that the second piston part of the oil tank presses the lubricant into different lubricated equipment according to the lubricant filling execution process.

8. The control system according to claim 7, characterized in that: The management network module is further configured to include a filling time manager and a filling amount manager; The filling time manager is configured to calculate and coordinate the lubricant filling time and lubricant filling cycle of different lubricated equipment according to the lubricant filling requirements of different lubricated equipment; The filling amount manager is configured to determine the total amount of lubricant in the oil tank, the amount of lubricant squeezed out each time, and the minimum liquid level of the replenished lubricant according to the lubricant filling requirements of different equipment to be lubricated.

9. The control system according to claim 7, characterized in that: The monitoring network module is further configured to include a positioning unit, a monitoring unit and a signal processing unit; The positioning unit is configured to obtain pressure signals of the first pneumatic chamber and the second pneumatic chamber in the cylinder through the first positioner of the decentralized control unit and obtain position signals of the piston plate of the first piston part in the cylinder through the second positioner of the decentralized control unit; The monitoring unit is configured to obtain state parameters of lubricant storage and filling in the oil tank through a monitor of the decentralized control unit; The signal processing unit is configured to exchange data with the positioning unit and the monitoring unit through a data communication bus, and to exchange data with the management network module, the control network module and the field network module.

10. A method for controlling safe filling of lubricant, used for a control system according to any one of claims 7 to 9 to control a safe filling device of lubricant according to any one of claims 1 to 6 to fill lubricant into different lubricated equipment, characterized in that: The control method comprises: Obtain lubricant filling requirements of different equipment to be lubricated through the management network module and coordinate the lubricant filling requirements according to the filling time, filling cycle and filling amount to obtain the lubricant filling execution process of different equipment to be lubricated; The monitoring network module is used to monitor the stroke of the first piston part inside the pneumatic part and the state parameters of the lubricant inside the oil tank to obtain monitoring data; The control network module outputs a lubricant filling control signal according to the lubricant filling execution process and the monitoring data; The field network module receives the lubricant filling control signal and controls the stroke of the first piston part inside the pneumatic part according to the lubricant filling control signal so that the second piston part inside the oil tank presses the lubricant into different devices according to the lubricant filling execution process.

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