Centralized lubrication device and method for coal mine and blockage and burst detection method

Abstract

The invention provides a centralized lubrication device and method for a coal mine and a blockage and burst detection method. The centralized lubricating device for the coal mine comprises an oil distribution system which is connected to a main lubricating pipeline of the lubricating device and a plurality of lubricating points under the coal mine, and the oil distribution system is configured to distribute lubricating oil / grease in the main lubricating pipeline to the plurality of lubricating points; the lubricating system comprises a second oil tank and a second lubricating pump, the second lubricating pump pumps lubricating oil / grease in the second oil tank into the main lubricating pipeline to maintain the pressure of the main lubricating pipeline, and the second oil tank comprises a liquid level detection device; the oil supplementing system is connected with the second oil tank and supplements lubricating oil / grease to the second oil tank; the control system is electrically connected to the oil distribution system, the lubricating system and the oil supplementing system and coordinates work of all the systems. The centralized lubricating device is connected with a plurality of underground lubricating points through the oil distributing system and is remotely and automatically controlled by the control system, the lubricating points are selected, lubricating oil / grease is accurately and quantitatively conveyed, and the labor intensity of workers is reduced.

Description

Technical Field

[0001] The invention belongs to the field of coal mine central lubrication systems, and in particular relates to a centralized lubrication device and method for coal mines, and a blockage and burst detection method. Background Art

[0002] There is a lot of dust in the coal mine, and the lubrication condition of the coal mine equipment is poor. In addition, the equipment is in operation all year round. The key joints and bearings of the rotating parts need to be regularly lubricated with oil / grease, otherwise the service life of the bearings will be short. These key lubrication parts are managed together to form a group of lubrication points.

[0003] The existing manual lubrication method requires personnel to climb up and down and use a lubricating oil pump for lubrication. It is difficult to accurately control the volume of lubricating oil / grease injected. Taking bearings as an example, too much lubricating oil / grease will cause the bearings to heat up, and too little will cause abnormal wear of the bearings. Summary of the invention

[0004] In view of this, the present application provides a centralized lubrication device, method and blockage and burst detection method for coal mines, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.

[0005] In order to achieve the aforementioned objectives, the first aspect of the present application provides a centralized lubrication device for coal mines, the centralized lubrication device for coal mines comprising: An oil distribution system, the oil distribution system is connected to the main lubrication pipeline of the lubrication device and multiple lubrication points in the coal mine, and the oil distribution system is configured to distribute the lubricating oil / grease in the main lubrication pipeline to the multiple lubrication points; a lubrication system, the lubrication system comprising a second oil tank and a second lubrication pump, the second lubrication pump being used to pump lubricating oil / grease in the second oil tank into the main lubrication pipeline to maintain the pressure of the main lubrication pipeline, the second oil tank comprising a liquid level detection device; an oil replenishing system, the oil replenishing system being connected to the second oil tank and being used for replenishing lubricating oil / grease into the second oil tank; A control system, wherein the control system is electrically connected to the oil distribution system, the lubrication system and the oil replenishment system, and is used to coordinate the work of each system.

[0006] In the centralized lubrication device as described above, optionally, the liquid level detection device includes a first travel switch and a second travel switch, wherein the first travel switch is triggered when the lubricating oil / grease in the second oil tank reaches a maximum limit, and the second travel switch is triggered when the lubricating oil / grease in the second oil tank reaches a minimum limit. The first travel switch and the second travel switch are connected to the control system.

[0007] In the centralized lubrication device as described above, optionally, the first travel switch and the second travel switch are both fixedly connected to the top plate of the second oil tank.

[0008] In the centralized lubrication device as described above, optionally, the liquid level detection device includes a liquid level indicator, and the liquid level indicator includes a liquid level follower cover and a vertical rod, the liquid level follower cover is configured to float on the upper surface of the lubricating oil / grease in the second oil tank, the vertical rod is vertically connected to the top of the liquid level follower cover, and the end of the vertical rod extends from the top plate of the second oil tank.

[0009] In the centralized lubrication device as described above, optionally, a low liquid level trigger head is provided at the end, the low liquid level trigger head is higher than the second travel switch, and an inclined second shoulder is provided at the bottom of the low liquid level trigger head.

[0010] In the centralized lubrication device as described above, optionally, the liquid level detection device includes a high liquid level push rod, which passes through the top plate of the second oil tank, and the high liquid level push rod is configured to be lifted up by the liquid level follower cover and trigger the first travel switch when the lubricating oil / grease in the second oil tank reaches a maximum limit.

[0011] In the centralized lubrication device as described above, optionally, the high liquid level push rod includes a high liquid level trigger head located at its top end, the high liquid level trigger head is lower than the first travel switch, and the top of the high liquid level trigger head is provided with a first shoulder inclined upward.

[0012] In the centralized lubrication device as described above, optionally, the liquid level follower cover is disc-shaped, and the edge of the liquid level follower cover is airtightly fitted to the inner wall of the second oil tank.

[0013] In the centralized lubrication device as described above, optionally, the lubrication system includes a first pressure sensor, the first pressure sensor is connected to the main lubrication pipeline, the first pressure sensor is connected to the control system, and the first pressure sensor is used to measure the pressure of the main lubrication pipeline and feed it back to the control system. The lubrication system comprises an overflow valve, and the overflow valve connects the main lubrication oil circuit and the second oil tank.

[0014] In the centralized lubrication device as described above, optionally, the oil replenishment system includes an oil replenishment pipeline, and the oil replenishment system is connected to the second oil tank through the oil replenishment pipeline. The oil replenishment system comprises a first oil tank and a first lubrication pump, wherein the first lubrication pump is connected to the first oil tank and is used to pump the lubricating oil / grease in the first oil tank into the oil replenishment pipeline. The first pressure gauge is connected to the oil replenishment pipeline and is used to display the pressure of the oil replenishment pipeline.

[0015] In the centralized lubrication device as described above, optionally, the oil distribution system includes one or more control boxes, the control box is connected to the main lubrication pipeline through the ball valve and filter it has, and the control box includes a switch valve, an oil distribution valve, a first electric actuator, a second electric actuator and a plurality of lubrication branches, The plurality of lubrication branches are connected to a plurality of lubrication points in the coal mine; The oil distribution valve has a plurality of third oil outlets, the third oil outlets are connected to the plurality of lubrication points through the lubrication branch, and each of the third oil outlets is connected to at least one lubrication point; The first electric actuator is connected to the switch valve to control the on-off of the oil circuit of the electric control box, and the second electric actuator is connected to the oil distribution valve to select the lubrication branch; The control box includes a displacement sensor, and the displacement sensor is connected to the valve core of the oil separation valve; The control box includes an electrical control module, which is connected to the control system via a POWERBUS bus for signal transmission and power supply; The electrical control module is respectively connected to the first electric actuator, the displacement sensor and the second electric actuator through a second communication line; The control box includes a first display screen, a first button, a shock-resistant pressure gauge, a wiring terminal and an explosion-proof housing.

[0016] In the centralized lubrication device as described above, optionally, the control box includes a magnetic switch and a volumetric flow meter, and the volumetric flow meter is connected to the control system and is used to measure the flow of lubricating oil / grease; The volumetric flow meter comprises a magnetic valve core and a valve body, The probe of the magnetic switch is arranged toward the magnetic valve core, The magnetic switch is connected to the electrical control module and is used to feed back a trigger signal of the magnetic switch.

[0017] In the centralized lubrication device as described above, optionally, the control system includes a host computer and an electric control box, the electric control box is electrically connected to the host computer, and the electric control box is used to receive detection signals and issue control instructions. The electric control box comprises a second display screen and a second button for controlling automatic lubrication.

[0018] In order to achieve the aforementioned object, the second aspect of the present application provides a lubrication method performed by a centralized lubrication device as described in any one of the aforementioned first aspects, wherein the centralized lubrication device for coal mines comprises: A first pressure sensor is provided on the main lubrication pipeline, the first pressure sensor is connected to the control system, and the first pressure sensor is used to measure the pressure of the main lubrication pipeline and feed back to the control system; The normal working pressure range of the main lubrication pipeline has a preset upper threshold value and a preset lower threshold value; The centralized lubrication device comprises a relief valve, the relief valve connects the main lubrication oil circuit and the second oil tank, and the set pressure of the relief valve is the upper threshold value; The oil distribution system includes one or more control boxes, which are connected to the main lubrication pipeline through the ball valve and filter provided therein, and the control box includes a switch valve, an oil distribution valve, a first electric actuator, a second electric actuator and a plurality of lubrication branches. The plurality of lubrication branches are connected to a plurality of lubrication points in the coal mine; The first electric actuator is connected to the switch valve to control the on-off of the oil circuit of the electric control box, and the second electric actuator is connected to the oil distribution valve to select the lubrication branch; The control box includes a volumetric flow meter, which is connected to the control system and is used to measure the flow rate of lubricating oil / grease; The steps of the lubrication method include: Ⅰ. System self-check: Start the control system to perform self-check and check the working status of the centralized lubrication device; Ⅱ. Pressure monitoring and regulation: ⅰ. Using the first pressure sensor to measure the pressure of the main lubrication pipeline, when the pressure is lower than the lower threshold, the control system controls the lubrication system to add lubricating oil / grease to the main lubrication pipeline until the pressure reaches above the lower threshold; ⅱ. When the pressure of the main lubrication line exceeds the upper threshold value, the overflow valve automatically opens and overflows to the second oil tank; Ⅲ. Lubrication point control: ⅰ. The control system issues an instruction to select the lubrication branch corresponding to the lubrication point that needs lubrication through the second electric actuator; ⅱ. Start the first electric actuator to open the switch valve and start filling oil to the selected lubrication point.

[0019] IV. Flow monitoring and stopping: The volumetric flow meter sends a pulse signal to the control system every time a fixed volume of lubricating oil passes through. When the accumulated number of pulse signals reaches a set value, the control system closes the switch valve to stop oil injection, otherwise lubrication continues until the set value is reached.

[0020] In order to achieve the aforementioned purpose, the third aspect of the present application provides a method for detecting lubrication branch blockage and burst in a centralized lubrication device as described in any one of the aforementioned first aspects, wherein the centralized lubrication device for coal mines comprises: A second pressure sensor is provided at the second oil outlet of the volumetric flow meter, and the second pressure sensor is connected to the control system; The blockage detection method comprises the following steps: during the lubrication of the lubrication point, when pressure is detected in the main lubrication pipeline but no pulse signal of the magnetic switch is detected, it indicates that the magnetic valve core cannot move left or right, and it is determined that the lubrication branch corresponding to the third oil outlet is blocked; The steps of the burst detection method include: during the lubrication process of the lubrication point, when the oil distribution valve is connected to the lubrication branch corresponding to the lubrication point, the second pressure sensor at the second oil outlet is connected to the lubrication branch, and if the pressure measured by the second pressure sensor is close to zero, it is determined that the lubrication branch has burst.

[0021] The centralized lubrication device for coal mines of the present invention is connected to multiple underground lubrication points through an oil distribution system and is remotely and automatically controlled by a control system to automatically select lubrication points and accurately and quantitatively deliver lubricating oil / grease, thereby reducing manual labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 This is a structural principle diagram of the centralized lubrication device for coal mines of the present invention; Figure 2 for Figure 1 A cross-sectional view of the second fuel tank; Figure 3 for Figure 1 Schematic diagram of the internal structure of the control box; Figure 4 for Figure 1 Structural schematic diagram of medium volume flow meter; Figure 5 The present invention is a flow chart of the lubrication method of the centralized lubrication device for coal mines.

[0024] Figure numerals: 1-oil distribution system; 2-main lubrication pipeline; 3-lubrication branch; 5-lubrication system; 6-second oil tank; 7-second lubrication pump; 8-liquid level detection device; 9-oil replenishment system; 10-control system; 11-first stroke switch; 12-second stroke switch; 13-top plate; 14-liquid level follower cover; 15-vertical rod; 16-end; 17-low liquid level trigger head; 18-second shoulder; 19-high liquid level top rod; 20-high liquid level trigger head; 21-liquid level indicator; 22-first shoulder; 23-oil replenishment pipeline; 26-first oil tank; 27-first lubrication pump; 28-first pressure gauge; 29-control box; 30-ball valve; 31-filter; 32-switch valve; 33-oil distribution valve; 34-positive displacement flow Meter; 36-first electric actuator; 37-second electric actuator; 38-first oil inlet; 40-displacement sensor; 41-electrical control module; 42-POWERBUS bus; 43-first button; 44-first display screen; 45-host computer; 46-electric control box; 47-second button; 48-second display screen; 49-first pressure sensor; 50-overflow valve; 51-seismic pressure gauge; 52-wiring terminal; 53-cable entry device; 54-explosion-proof housing; 55-magnetic switch; 56-second oil inlet; 57-magnetic valve core; 58-valve body; 59-second oil outlet; 60-third oil outlet; 61-second pressure gauge; 62-first communication line; 63-second communication line; 64-probe. DETAILED DESCRIPTION

[0025] With reference to the accompanying drawings and specific embodiments, the structure, composition, characteristics and advantages of the centralized lubrication device, method and blockage and burst detection method for coal mines of the present invention will be described below in an exemplary manner. However, all descriptions should not be used to form any limitations on the present invention.

[0026] For any single technical feature described or implied in the embodiments mentioned in this document, or any single technical feature displayed or implied in the accompanying drawings, the present invention still allows any combination or deletion between these technical features (or their equivalents) without any technical obstacles, and thus it should be considered that these more embodiments according to the present invention are also within the scope of the description of this document.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0028] The term "lubrication point" refers to the parts of one or more equipment in a coal mine that require lubrication, including but not limited to the arm joints of an excavator, the hinge seats of a hydraulic cylinder, and the rotating joints of a roadheader cutter head.

[0029] Figure 1 The structural principle diagram of the centralized lubrication device for coal mines of the present invention is shown in FIG. Figure 1 As shown, the centralized lubrication device for coal mines of the present invention comprises an oil distribution system 1, a lubrication system 5, an oil replenishment system 9 and a control system 10. The structural components of the above four systems will be described below: The oil distribution system 1 is connected to the main lubrication pipeline 2 of the centralized lubrication device of the present invention and multiple lubrication points in the coal mine. The lubricating oil / grease enters the oil distribution system 1 from the main lubrication pipeline 2 and is distributed to each lubrication point via the oil distribution system 1. Specifically, the oil distribution system 1 may include multiple outlets, each outlet is connected to a different lubrication point 3. An oil distribution valve may be configured inside the oil distribution system, which can adjust the oil supply amount and oil supply time of each outlet according to a preset program to adapt to the working conditions of different lubrication points. The lubrication points may be located on key moving parts of coal mining equipment, such as hydraulic cylinders, arm joints of excavators, and cutter head connections of tunneling machines. The lubrication points need to be continuously replenished with lubricating oil / grease. Due to the different working equipment and working conditions of different lubrication points, the supply interval and amount of lubricating oil / grease required for each supply will also be different. These lubricating oil / greases are input into the main lubrication pipeline 2 by the lubrication system 5; The lubrication system 5 includes a second oil tank 6 and a second lubrication pump 7. The function of the lubrication system 5 is to maintain the pressure of the lubricating oil / grease in the main lubrication pipeline 2 to ensure that the lubricating oil / grease can be smoothly transported to each lubrication point 3. The second oil tank 6 is used to store the lubricating oil / grease. The second lubrication pump 7 pumps the lubricating oil / grease in the second oil tank 6 into the main lubrication pipeline 2, thereby maintaining a constant oil pressure in the main lubrication pipeline 2. The second oil tank 6 includes a liquid level detection device 8, which is used to detect whether the liquid level of the lubricating oil / grease stored in the second oil tank 6 reaches the maximum and minimum limits. When the lubricating oil / grease level in the oil tank is detected to be lower than the preset minimum limit, the centralized lubrication device of the present invention will start the oil replenishment system 9 to replenish the lubricating oil / grease. When the liquid level is detected to be higher than the preset maximum limit, the oil replenishment system 9 stops replenishing. When the oil replenishment system 9 is started and stopped, the centralized lubrication device of the present invention can send an alarm to remind the operator; The oil replenishment system 9 is connected to the second oil tank 6 and is used to automatically replenish the lubricating oil / grease into the second oil tank 6 when the lubricating oil / grease is below a minimum limit; The control system 10 is electrically connected to the oil distribution system 1, the lubrication system 5 and the oil replenishment system 9, and is used to coordinate the work of each system. During operation, the control system 10 can automatically start or stop the oil distribution system 1 and the second lubrication pump 7 according to a preset program or implemented detection data to ensure that each lubrication point 3 obtains an appropriate amount of lubricating oil / grease as needed. When the lubricating oil / grease level in the second oil tank 6 is lower than the minimum limit, the control system 10 will also start the oil replenishment system 9 to automatically replenish the lubricating oil / grease to maintain normal operation of the system.

[0030] like Figure 1 As shown, the oil replenishment system 9 includes an oil replenishment pipeline 23, a first oil tank 26 and a first lubrication pump 27. The oil replenishment system 9 is connected to the second oil tank 6 through the oil replenishment pipeline 23, and is mainly used to automatically replenish the lubricating oil / grease when the lubricating oil / grease level in the second oil tank 6 is too low under the monitoring of the liquid level detection device 8, thereby ensuring the continuous operation of the entire centralized lubrication device.

[0031] The oil replenishment pipeline 23 connects the oil replenishment system 9 and the second oil tank 6, and is used to transport the lubricating oil / grease from the first oil tank 26 to the second oil tank 6 through the oil replenishment pipeline 23 when the lubricating oil / grease liquid level in the second oil tank 6 reaches the minimum limit. The oil replenishment pipeline 23 can be made of a high-strength and pressure-resistant metal material, and is suitable for safely transporting lubricating oil / grease under high pressure. In order to prevent impurities in the oil product from entering the lubrication system, a filter can also be provided in the oil replenishment pipeline 23 to filter solid particles or other impurities in the lubricating oil / grease.

[0032] A large amount of lubricating oil / grease is stored in the first oil tank 26 to ensure that the lubricating oil / grease can be continuously replenished to the second oil tank 6 during long-term operation. Optionally, the capacity of the first oil tank 26 can be designed according to the lubrication requirements of the equipment, and a liquid level observation window or liquid level indicator can be set on the top of the oil tank to facilitate the operator to monitor the remaining amount of lubricating oil / grease in the oil tank in real time. The first oil tank 26 can adopt a standard oil barrel of 100 liters or 200 liters, which has better sealing performance, is conducive to the storage of lubricating oil / grease, and prevents it from deteriorating.

[0033] The first lubrication pump 27 is used to pump the lubricating oil / grease in the first oil tank 26 into the second oil tank 6 through the oil replenishment pipeline 23. The first lubrication pump 27 is connected to the oil replenishment pipeline 23. The first lubrication pump 27 can be a screw lubrication pump, which can adapt to high-viscosity lubricating oil / grease. Its screw extends into the first oil tank 26 to extract the lubricating oil / grease at the bottom of the oil tank, eliminating the need for an additional oil extraction device, thereby expanding the types of available oil tanks.

[0034] The oil replenishment system 9 may further include a first pressure gauge 28 . The first pressure gauge 28 is installed on the oil replenishment pipeline 23 . Through the first pressure gauge 28 , an operator can visually see the pressure change in the oil replenishment pipeline 23 .

[0035] In the centralized lubrication device of the present invention, the control system 10 coordinates the work of each subsystem, accurately manages the delivery process of lubricating oil / grease through automatic control, and ensures normal lubrication of the lubrication points. The control system 10 includes a host computer 45 and an electric control box 46, and the electric control box 46 is electrically connected to the host computer 45, so that a communication connection is established between the two to realize remote monitoring and operation control of the centralized lubrication device.

[0036] The host computer 45 is a high-level management unit of the control system 10, which can be a computer or an industrial control terminal, and is used to perform monitoring of the lubrication system, data processing, and the issuance of operation instructions. The host computer 45 is connected to the electric control box 46 through the first communication line 62, and can receive data from the electric control box 46 in real time, such as the operating status of the lubrication system 5, the flow rate and pressure of the lubricating oil / grease, and can also receive the operating status of the oil replenishment system 9 and the lubrication system 5 in real time. The host computer 45 can not only optimize the lubrication demand of the equipment through data analysis, but also remotely adjust the lubrication parameters, such as the delivery frequency and supply amount of the lubricating oil / grease.

[0037] The electric control box 46 is the core execution unit in the control system 10, responsible for receiving detection signals from various sensors, including but not limited to the liquid level detection device 8 and the first pressure sensor 49, and issuing control instructions according to a predetermined program to adjust the operation of the lubrication system 5. The electric control box 46 is connected to the host computer 45, receives control instructions from the host computer 45, and feeds back actual detection signals to the host computer 45 to achieve two-way communication.

[0038] The electric control box 46 may include a second display screen 48 and a second button 47, which facilitates the on-site operator to directly view and control the system status. The second display screen 48 displays the operating data of the lubrication system 5 in real time, such as the current lubricating oil / grease delivery port and delivery flow, the pressure in the main lubrication pipeline 2, the liquid level status of the second oil tank 6, and other information. The second button 47 provides a simple and fast operation method. The on-site operator can realize the basic functions of the lubrication point selection, start / stop lubrication operation, set the lubrication interval time corresponding to different lubrication points, and the lubricating oil / grease injection amount of the lubrication system 5 by pressing the button.

[0039] Through the coordinated work of the electric control box 46 and the host computer 45, the centralized lubrication device of the present invention can realize automatic control of lubrication. The electric control box 46 receives the detection signals from each subsystem and issues instructions according to the preset program and control logic. For example, when the liquid level detection device 8 detects that the lubricating oil / grease level in the second oil tank 6 is lower than the minimum limit, the electric control box 46 will automatically issue an instruction to start the oil replenishment system 9, and replenish the lubricating oil / grease to the second oil tank 6 through the first lubrication pump 27. In addition, the on-site operator can adjust the supply amount and frequency of the lubricating oil / grease through the second button 47, thereby improving the parameters of automatic control of lubrication and ensuring that the lubrication needs of different lubrication points 3 are accurately met.

[0040] Figure 2 for Figure 1 The cross-sectional view of the second oil tank in FIG. Figure 1 and Figure 2 An embodiment of the lubrication system 5 of the centralized lubrication device of the present invention will be further described.

[0041] like Figure 2 As shown, the liquid level detection device 8 includes a first travel switch 11 and a second travel switch 12. The first travel switch 11 is triggered when the lubricating oil / grease in the second oil tank 6 reaches the maximum limit, and the second travel switch 12 is triggered when the lubricating oil / grease in the second oil tank 6 reaches the minimum limit. The first travel switch 11 and the second travel switch 12 are both connected to the control system 10, and can send a signal to the control system 10 when the switch is triggered.

[0042] The first travel switch 11 and the second travel switch 12 are used to detect the highest liquid level and the lowest liquid level respectively. The system structure is simple and the hardware installation is intuitive. The travel switches 11 and 12 can be directly triggered mechanically, and the circuit structure is simple, reliable, and fast in response. When the liquid level reaches the set limit, the travel switch is triggered immediately, and the system responds quickly to start or stop the oil replenishment system 9. In comparison, the use of a liquid level sensor requires continuous measurement of the liquid level height, and the addition of a data processing module makes the structure more complex and the response time longer. Therefore, the travel switch solution has a simple structure, simple maintenance, fast response, low cost, and strong anti-interference ability.

[0043] Specifically, the mechanically triggered first travel switch 11 and second travel switch 12 may use a micro-moving contact structure and be provided with a component that floats with the liquid surface. When the liquid level reaches a set limit, the component that moves with the liquid surface will touch or sense the contact of the travel switch, thereby triggering the switch. Alternatively, the triggering method may also use contact conduction, magnetic induction triggering, and the like.

[0044] As a preferred embodiment, the first travel switch 11 and the second travel switch 12 can be both installed on the top plate 13 of the second oil tank 6. This installation method exposes the two travel switches 11 and 12 outside the oil tank, which is convenient for maintenance and detection, and can also effectively prevent lubricating oil / grease from contaminating the two travel switches 11, 12 and contacts. Thereby maintaining the reliability of the two travel switches 11 and 12. The two travel switches 11 and 12 can be connected to the control system 10 through wires and / or wireless modules to ensure that when the liquid level reaches the highest or lowest limit, the signal can be fed back to the control system 10 in time to perform corresponding control operations.

[0045] As an alternative embodiment, the first travel switch 11 and the second travel switch 12 may also be of magnetic induction trigger type, mounted on the outer wall of the second oil tank 6, and the travel switch is triggered by the movement of the magnetic float as the liquid level changes; Preferably, the liquid level detection device 8 may also include a liquid level indicator 21, which is used to visually display the liquid level of the lubricating oil / grease in the second oil tank 6, and mainly includes two parts: a liquid level follower cover 14 and a vertical rod 15. The liquid level follower cover 14 floats on the surface of the lubricating oil / grease and floats as the liquid level rises or falls. The vertical rod 15 is vertically connected to the top of the liquid level follower cover 14, and its end passes through the top plate 13 of the second oil tank 6 and extends from the outside. The operator can visually observe the changes in the liquid level inside the oil tank through the height changes of the vertical rod 15. Through the up and down movement of the vertical rod 15, the changes in the liquid level inside the second oil tank 6 can be directly observed from the outside, and the operator can easily determine whether the oil level is close to the maximum or minimum limit without opening the oil tank or using other complex sensors. This improves the maintenance efficiency and use safety of the equipment. The liquid level indicator 21 has a very simple structural design. The liquid level follower cover 14 and the vertical rod 15 are both mechanical components and do not rely on complex electronic or optical components. Therefore, the manufacturing cost is low, the installation and maintenance are convenient, and it has high durability and reliability in harsh environments such as coal mines.

[0046] Alternative embodiments of the liquid level indicator 21 include: the liquid level detection device 8 may also include a pressure sensor located at the inner bottom of the second oil tank 6, which detects the liquid pressure at the bottom of the oil tank to calculate the liquid level height in the oil tank, thereby determining whether the liquid level has reached the highest / lowest limit position.

[0047] Preferably, a low liquid level trigger head 17 is provided at the end of the vertical rod 15, and the low liquid level trigger head 17 is used to trigger the second travel switch 12 by mechanical means when the liquid level drops to the minimum. The low liquid level trigger head 17 is located higher than the second travel switch 12, and an inclined second shoulder 18 is provided at its bottom. When the liquid level drops, the vertical rod 15 moves downward synchronously with the low liquid level trigger head 17 and the second shoulder 18. When the liquid level in the second oil tank 6 drops to the minimum, the liquid level follower cover 14 drops with the oil level, driving the vertical rod 15 to move downward. During the descent of the low liquid level trigger head 17 at the end 16 of the vertical rod 15, the second shoulder 18 at the bottom thereof will gradually approach the contact of the second travel switch 12. When the second shoulder 18 contacts the contact of the second travel switch 12, a smooth triggering action is generated due to the inclined design of the second shoulder 18, ensuring that the switch contact can be accurately triggered. After being triggered, the second travel switch 12 sends a signal to the control system 10, indicating that the liquid level has reached the minimum limit, and the oil replenishment system 9 can be started to replenish oil. The inclined design of the second shoulder 18 makes the triggering action of the travel switch 12 smooth and stable during the descent of the vertical rod 15, and prevents accidental touches due to impact; and the inclined surface provides a more sufficient contact area to avoid trigger failure due to vibration of the vertical rod 15 or shaking of the low liquid level trigger head 17, thereby improving reliability. In addition, the mechanical structure is used for triggering, which is simple and reliable in structure and has strong stability when used in the harsh environment of coal mines. Furthermore, the vertical rod 15 can be set to an adjustable length to enhance the adjustment capability.

[0048] Furthermore, the shapes of the low liquid level trigger head 17 and the second shoulder 18 can be adjusted according to the requirements. In this embodiment, the angle of the second shoulder 18 is set to 45 degrees. Alternatively, the second shoulder 18 can be designed with different tilt angles to meet different travel switch triggering requirements; at the same time, the trigger head can be made of wear-resistant material to extend its service life.

[0049] Alternatively, the low liquid level trigger head 17 may be made of a magnetic material, and may be triggered by magnetic induction when it is close to the contact of the second travel switch 12; or the low liquid level trigger head 17 may be made of a conductive material, and may be electrically triggered when it contacts the contact of the second travel switch 12. These alternatives can reduce the impact of environmental interference while maintaining the trigger sensitivity of the second travel switch 12.

[0050] Preferably, the liquid level detection device 8 may include a high liquid level push rod 19. When the lubricating oil / grease reaches the maximum limit, the high liquid level push rod 19 is lifted up by the liquid level follower cover 14. The high liquid level push rod 19 passes through the top plate 13 of the second oil tank 6, and a first travel switch 11 is arranged above its end. When the high liquid level push rod 19 is lifted up to a predetermined height, the first travel switch 11 is triggered, and a signal is sent to the control system 10 to stop the operation of the oil replenishment system 9, so as to prevent the second oil tank 6 from being overfilled and causing the lubricating oil / grease to overflow. The triggering mechanism of the high liquid level push rod 19 ensures that a signal is sent in time when the oil tank reaches the maximum capacity, so as to avoid overflow caused by excessive lubricating oil / grease and ensure the safe operation of the system; the high liquid level push rod 19 is controlled by the mechanical movement of the liquid level follower cover 14, does not rely on complex sensors or electronic components, is simple to maintain, and has high reliability.

[0051] Preferably, a high liquid level trigger head 20 is provided at the top of the high liquid level push rod 19, and the high liquid level trigger head 20 is lower than the first travel switch 11. When the liquid level rises, the liquid level follower cover 14 lifts the high liquid level push rod 19 through the vertical rod 15, and the high liquid level trigger head 20 is close to the first travel switch 11. An inclined first shoulder 22 is provided at the top of the high liquid level trigger head 20 to ensure that when the liquid level reaches the maximum limit, the shoulder can smoothly and accurately trigger the first travel switch 11. The inclined first shoulder 22 reduces the possibility of false triggering due to instantaneous mechanical shock. When the high liquid level trigger head 20 accurately triggers the first travel switch 11, the control system 10 receives a signal and stops the oil replenishment operation. The inclined shoulder design of the high liquid level trigger head 20 ensures the smoothness of the triggering action of the first travel switch 11, avoids excessive impact caused by the rapid rise of the liquid level follower cover 14, and causes false triggering or damage to the switch, thereby improving the triggering accuracy and the durability of the travel switch; the design of the first shoulder 22 can be optimized and adjusted according to the specific conditions of the oil tank, such as changing the inclination angle or material, to adapt to the different movement speeds of the high liquid level trigger head 20 caused by different oil tank sizes and oil filling speeds, thereby ensuring the reliability of the triggering action.

[0052] Furthermore, in addition to the high liquid level trigger head 20 with a first shoulder 22 disposed at the top of the high liquid level push rod 19, alternative embodiments include: The high liquid level push rod 19 can adopt a spherical trigger head instead of the inclined first shoulder 22 design. Its surface is smooth and can smoothly trigger the switch by sliding when the spherical surface contacts the travel switch, avoiding the impact problem during rapid rise. A roller-type trigger head can be set at the top of the high liquid level push rod 19. When the roller structure contacts the travel switch 11, it can trigger the switch by rolling action to avoid direct impact caused by the rapid rise of the liquid level. The high liquid level trigger head 20 can adopt a soft contact material, such as rubber or elastic polymer, so that the trigger head has a certain elasticity. When the soft contact contacts the first travel switch 11, it will also be slightly compressed while triggering the switch, ensuring that even if the liquid level rises quickly, it can avoid impact damage to the travel switch or contact. The high liquid level push rod 19 can be installed with an adjustable length trigger rod at the top. The trigger rod can change its length by rotating or sliding, which is convenient for the operator to adjust the maximum limit height of the oil tank liquid level, and also makes the high liquid level push rod 19 suitable for oil tanks of various sizes.

[0053] Furthermore, the liquid level follower cover 14 is designed as a disc-shaped structure, and its edge is closely fitted with the inner wall of the second oil tank 6 to achieve an airtight effect. The disc-shaped design ensures that the liquid level follower cover 14 can stably float on the surface of the lubricating oil / grease and move up and down smoothly with the change of the liquid level. In order to ensure airtightness, the size and shape of the liquid level follower cover 14 must be precisely matched with the inner wall section of the second oil tank 6, so that the liquid level follower cover 14 is closely fitted with the inner wall, thereby achieving an effective airtight connection.

[0054] Through this airtight design, the liquid level follower cover 14 can fit tightly on the lubricating oil / grease surface, ensuring that when the liquid level inside the oil tank changes, the liquid level follower cover 14 can move stably to prevent oil leakage or outside air from entering. In actual use, in order to prevent the liquid level indicator 21 and its liquid level follower cover 14 or vertical rod 15 from getting stuck, the possible causes of the jam must be considered, which may include: the roughness of the contact surface between the liquid level follower cover 14 and the inner wall of the second oil tank 6 or the vertical rod 15 and the top plate 13 or burrs due to long-term friction, which may increase the friction resistance and affect the movement of the liquid level follower cover 14; or due to environmental vibration, the vertical rod 15 may bend due to uneven force, resulting in increased friction between the top plate 13 and affecting the movement of the liquid level follower cover 14.

[0055] If the liquid level follower cover 14 or the vertical rod 15 is stuck, the liquid level follower cover 14 will not be able to move with the liquid level. At this time, due to the gap between the liquid level follower cover 14 and the inner wall of the second oil tank 6, the liquid level of the lubricating oil / grease will be immersed in the liquid level follower cover 14 when the level rises, and the liquid level will be separated from the liquid level follower cover 14 when the level drops, and the liquid level indicator 21 cannot work normally.

[0056] However, when the liquid level follower cover 14 is airtightly attached to the inner wall of the second oil tank 6, the liquid level follower cover 14 can effectively use the system pressure to deal with friction or jamming problems. When the lubricating oil / grease level rises, the pressure of the oil replenishment system 9 is transmitted to the liquid level follower cover 14, exerting a large upward thrust on it, automatically overcoming the jamming caused by friction or vibration, and ensuring that the hydraulic follower cover 14 can move up smoothly; when the liquid level drops, a negative pressure space is formed between the liquid level follower cover 14 and the lubricating oil / grease, and the atmospheric pressure will exert a downward thrust on the liquid level follower cover 14, helping it to overcome the friction and move downward.

[0057] This design enables the centralized lubrication device of the present invention to automatically overcome the problem of the liquid level follower cover 14 being stuck due to contact friction, ensures the stable operation of the liquid level follower cover 14, reduces manual intervention, and improves reliability. In addition, the airtight design can also prevent external impurities (such as dust and particulate matter) from entering the lubricating oil / grease, protect its purity, and improve the reliability of the lubrication system 5. The airtight design provides a larger contact area between the liquid level follower cover 14 and the lubricating oil / grease, thereby improving the stability of the liquid level follower cover 14.

[0058] Furthermore, if Figure 1 As shown, the lubrication system 5 of the present invention may also include a first pressure sensor 49 and a relief valve 50 to ensure that the pressure of the lubricating oil / grease in the main lubricating pipeline 2 can be accurately monitored and controlled. The first pressure sensor 49 is connected to the main lubricating pipeline 2 and is used to measure the pressure in the main lubricating pipeline 2 in real time. The first pressure sensor 49 is electrically connected to the control system 10, and feeds back pressure data to the control system 10, and responds when the pressure value is abnormal. When the pressure of the main lubricating pipeline 2 is lower than the set range, the control system 10 can automatically start the second lubrication pump 7 to replenish the lubricating oil / grease in the main lubricating pipeline 2 to prevent the effect of oil supply to the lubrication point from being affected due to insufficient pressure. When the pressure of the main lubricating pipeline 2 is higher than the set range, the control system 10 can automatically shut down the second lubrication pump 7 to avoid excessive pressure in the main lubricating pipeline 2, which damages the sealing and pipeline structure. By monitoring the pressure in real time, the first pressure sensor 49 can ensure that the pressure in the main lubricating pipeline 2 is maintained within a reasonable range to prevent lubrication failure or pipeline damage caused by abnormal pressure. The control system 10 can automatically adjust the working state of the lubrication pump 7 according to the data fed back by the first pressure sensor 49, ensure the stable operation of the system, and reduce the need for manual monitoring and adjustment. Furthermore, when the pressure is abnormal, the control system 10 can send an alarm signal to prompt the operator to check and avoid the expansion of the impact of the system failure. Furthermore, a second pressure gauge 61 can be set near the first pressure sensor 49, which is convenient for the on-site operator to intuitively observe the pressure of the main lubrication pipeline 2 and serves as a backup for the first pressure sensor 49.

[0059] The overflow valve 50 is connected between the main lubrication pipeline 2 and the second oil tank 6, and is used to guide the excess lubrication oil / grease back to the second oil tank 6 when the lubrication oil / grease pressure is too high. The overflow valve 50 can protect the main lubrication pipeline 2 from the influence of excessive pressure by releasing excessive pressure, thereby preventing equipment damage. The control system 10 controls the start and stop of the second lubrication pump 7 through electrical connection, and its failure is not easy to be detected. When the pressure of the main lubrication pipeline 2 is too high and the control system 10 cannot stop the second lubrication pump 7, the overflow valve 50 can reliably release the excess pressure to ensure that the pressure in the main lubrication pipeline 2 is always within a safe range, ensuring the safety of equipment and operators. In addition, after the excess lubrication oil / grease flows back to the second oil tank 6, it can be used again by the lubrication pump 7 to achieve the recycling of lubrication oil / grease and reduce resource waste.

[0060] Figure 3 for Figure 1 The internal structure diagram of the control box is shown below. Figure 3 An embodiment of the oil separation system 1 will be described.

[0061] In the centralized lubrication device of the present invention, the oil distribution system 1 includes one or more control boxes 29, each of which is connected to a ball valve 30 (see Figure 1 ) and filter 31 (see Figure 1 ) is connected to the main lubrication pipeline 2. The control box 29 is connected to multiple lubrication points in the coal mine through the multiple lubrication branches 3. The control box 29 is used to distribute lubricating oil / grease to multiple lubrication branches 3 (see Figure 1 ), and then transported to the lubrication point corresponding to the lubrication branch 3. The control box 29 is used to accurately distribute lubricating oil / grease and detect blockage and burst of the lubrication branch.

[0062] from Figure 2As can be seen in the figure, the control box 29 includes a switch valve 32, an oil distributor valve 33, a first electric actuator 36, a second electric actuator 37 and a plurality of lubrication branches 3. The switch valve 32 controls the on-off of the oil circuit of the control box 29 in which it is located, ensuring the precise opening and closing of the oil circuit at the beginning and end of the lubrication operation. The switch valve 32 is connected to the main lubrication pipeline 2 through the second oil inlet 56, and the lubricating oil / grease passes through the second oil inlet 56 and passes through the switch valve 32 and the oil distributor valve 33 in turn. The oil distributor valve 33 is provided with a plurality of third oil outlets 60, and the number of the third oil outlets 60 is consistent with the number of lubrication branches 3, ensuring that the lubricating oil / grease can be distributed to each lubrication point 3. The electric actuators equipped in the control box 29 include a first electric actuator 36, a second electric actuator 37 and a displacement sensor. The first electric actuator 36 is connected to the switch valve 32 to control the position of the valve core of the switch valve 32, thereby controlling the oil circuit of the control box 29; the second electric actuator 37 is connected to the oil separator valve 33 to control the position of the valve core of the oil separator valve 33, thereby selecting the lubrication branch 3 and accurately delivering the lubricating oil / grease to the required lubrication points; the displacement sensor 40 is connected to the valve core of the oil separator valve 33, and the position of the valve core is fed back to the control system 10 to monitor and adjust the state of the oil separator valve. Specifically, in this embodiment, the displacement sensor 40 is connected to the moving end of the second electric actuator 37, and the moving end of the second electric actuator 37 is fixedly connected to the valve core of the oil separator valve 33, and the two move synchronously, so the displacement of the moving end of the second electric actuator 37 can accurately reflect the displacement of the valve core of the oil separator valve 33.

[0063] The electrical control module 41 in the control box 29 is connected to the POWERBUS bus 42 (see Figure 1 ) is connected to the control system 10 for signal transmission and power supply, so as to realize the communication between the oil distribution system 1 and the control system 10. At the same time, the electrical control module 41 is respectively connected to the first electric actuator 36, the displacement sensor 40 and the second electric actuator 37 through the second communication line 63, so as to ensure the accuracy of the command and data transmission between the control system 10 and the components of the control box 29.

[0064] The control box 29 is provided with a first display screen 44 (see Figure 1 ) and the first button 43 (see Figure 1 ). The first display screen 44 is used to display the lubrication status parameters of the system, such as oil pressure and flow, so that the operator can monitor the operating status of the lubrication system at any time; the first button 43 is used for manual control operation, allowing the operator to select a lubrication point for lubrication, further improving the flexibility of operation.

[0065] To adapt to the harsh environment, the control box 29 also includes a seismic pressure gauge 51, a terminal block 52 and an explosion-proof housing 54. The terminal block 52 includes a cable lead-in device 53. The seismic pressure gauge 51 is used to accurately monitor the pressure; the explosion-proof housing 54 protects the control box from external impact and prevents sparks from the control box 29 from being exposed, thereby ensuring the safe operation of the centralized lubrication device and underground production.

[0066] Figure 4 for Figure 1 The structural principle diagram of the medium volume flow meter. Figure 4 An embodiment of the volumetric flow meter 34 will be described.

[0067] Furthermore, the control box 29 also includes a magnetic switch 55 and a volumetric flow meter 34 to achieve accurate monitoring of the lubricating oil / grease flow rate and ensure that the oil supply of each lubrication point 3 meets the demand.

[0068] The volumetric flowmeter 34 is located between the switch valve 32 and the oil distributor valve 33, and is used to measure the flow of lubricating oil / grease passing through the control box 29. The volumetric flowmeter 34 includes a magnetic valve core 57 and a valve body 58. The lubricating oil / grease flows into the volumetric flowmeter 34 from the first oil inlet 38. When the lubricating oil / grease flows through the volumetric flowmeter 34, it pushes the magnetic valve core 57 to move back and forth. The volume of lubricating oil / grease output from the second oil outlet 59 by the volumetric flowmeter 34 for each reciprocating movement is fixed. By accumulating the number of reciprocating movements of the magnetic valve core 57, the amount of lubricating oil / grease passing through can be accurately calculated.

[0069] The magnetic switch 55 is installed parallel to the axis of the magnetic valve core 57, and its probe 64 is aligned with the position of the magnetic valve core 57. The magnetic switch 55 is connected to the electrical control module 41. In this embodiment, the magnetic switch 55 is installed on the left side of the magnetic valve core 57. Each time the magnetic valve core 57 reciprocates in the valve body 58 and moves to the left to the leftmost end, the magnetic field strength detected by the probe 64 gradually increases until it reaches the threshold, and the magnetic switch 55 generates a trigger signal. The signal is transmitted to the control system 10 through the electrical control module 41 to realize real-time monitoring of the lubricating oil / grease flow.

[0070] In the centralized lubrication device of the present invention, the control system 10 may further include a combination structure of a host computer 45 and an electric control box 46. The host computer 45 and the electric control box 46 are electrically connected to realize the two-way communication of the monitoring, operation and control instructions of the centralized lubrication device, making the control of the entire lubrication system more intelligent and convenient.

[0071] The host computer 45 is mainly used to monitor the overall operation status of the lubrication system and process detection signals and control instructions. The host computer 45 can be a computer or an industrial control terminal, which is connected to the electric control box 46, receives the detection data from the electric control box 46, and determines the current operation status of the lubrication system through analysis.

[0072] The electric control box 46 receives the command from the upper computer 45 and transmits the detection signal to the upper computer 45. The electric control box 46 is connected with multiple components such as the oil distribution system 1, the lubrication system 5 and the oil replenishment system 9, and can centrally manage the real-time operation of the system.

[0073] The electric control box 46 may also be equipped with a second display screen 48 and a second button 47. The second display screen 48 is used to display the current operating parameters of the system, including lubrication status, pressure and other information, so that the on-site operator can monitor the operating status of the system. The second button 47 is used for manual operation or debugging of the lubrication mode, so that the operator can manually control the lubrication operation or adjust the lubrication parameters on site, thereby enhancing the operational flexibility of the system.

[0074] Figure 5 The lubrication method flow chart of the centralized lubrication device for coal mines of the present invention is shown below. Figure 5 The lubrication method implemented in this centralized lubrication device is described.

[0075] This method realizes intelligent management of the lubrication process through multiple automatic control and monitoring technologies, ensuring the stable operation of the lubrication system, and is suitable for complex working conditions such as underground coal mines that require centralized lubrication. The specific implementation steps are as follows: Ⅰ. System self-check The control system 10 of the centralized lubrication device is started and a comprehensive self-check is performed to ensure that all parts of the lubrication device are in normal working condition. The system self-check includes checking the control system 10, the first electric actuator 36, the second electric actuator 37, the volumetric flow meter 34, the first pressure sensor 49, and the connection conditions of each pipeline and valve. The self-check ensures that all components are normal and the next lubrication step can be performed smoothly.

[0076] Ⅱ. Pressure monitoring and regulation A first pressure sensor 49 is installed on the main lubrication pipeline 2 of the centralized lubrication device. The first pressure sensor 49 monitors the pressure in the main lubrication pipeline 2 in real time and feeds back the pressure data to the control system 10. The specific process of pressure monitoring and regulation is as follows: i. Low-pressure oil replenishment: When the first pressure sensor 49 detects that the pressure of the main lubrication pipeline 2 is lower than the preset lower threshold, the control system 10 recognizes that the pressure is insufficient and automatically starts the oil replenishment operation. The control system 10 controls the lubrication system 5 to replenish lubricating oil / grease to the main lubrication pipeline 2 until the pressure of the main lubrication pipeline 2 returns to above the lower threshold, thereby ensuring that the system has sufficient lubrication pressure.

[0077] ⅱ. High-pressure overflow: When the first pressure sensor 49 detects that the pressure of the main lubrication pipeline 2 exceeds the upper threshold, it indicates that the pressure in the pipeline is too high, which may threaten the safety of equipment and personnel. At this time, the overflow valve 50 connected between the main lubrication pipeline 2 and the second oil tank 6 automatically opens after the pressure exceeds its set pressure, and the excess lubricating oil / grease is discharged to the second oil tank 6 through overflow, releasing the excessive pressure in the main lubrication pipeline 2, and ensuring that the centralized lubrication device works within a safe pressure range.

[0078] Ⅲ. Lubrication point control The control of the lubrication points during the lubrication process is achieved by the control system 10 through the control box 29 of the oil distribution system 1. The first electric actuator 36 and the second electric actuator 37 of the control box 29 are responsible for the opening and closing of the switch valve 32 and the adjustment operation of the oil distribution valve 33 respectively. The specific operation steps are as follows: i. Lubrication branch selection: The control system 10 first sends a command to the second electric actuator 37 to drive the valve core of the oil distributor valve 33 to select the lubrication branch 3 corresponding to the target lubrication point. The second electric actuator 37 connects the oil distributor valve 33 to the branch of the selected lubrication point to prepare for oil injection.

[0079] ii. Opening and closing of the switch valve: After completing the branch selection of the lubrication point, the control system 10 sends a command to the first electric actuator 36 to drive the switch valve 32 to open. After the switch valve 32 is opened, the lubricating oil / grease flows along the selected branch 3 to the selected target lubrication point to achieve lubrication of the lubrication point.

[0080] IV. Flow monitoring and stopping During the lubrication process, the volumetric flowmeter 34 in the control box 29 accurately monitors the injection amount of lubricating oil / grease to ensure that the lubrication points are fully lubricated. During the lubrication process, the volumetric flowmeter 34 generates a pulse signal every time a fixed volume of lubricating oil passes through the built-in magnetic valve core 57 and valve body 58 structure (the fixed volume is determined by the structure of the magnetic valve core 57 and valve body 58). The pulse signal is fed back to the control system 10 in real time to monitor the accumulation of lubrication.

[0081] The control system 10 counts the pulse signal. When the accumulated pulse number reaches the lubrication amount set for the selected lubrication point, it indicates that the lubrication point has been sufficiently lubricated. At this time, the control system 10 sends a command to the first electric actuator 36 to close the switch valve 32 and stop oiling. If the accumulated pulse number does not reach the set value, the lubrication process continues until the accumulated pulse signal number reaches the set value to meet the lubrication demand.

[0082] The lubrication time interval and the amount of lubricant / grease delivered to the lubrication point depend on the working conditions of the lubricated parts at the lubrication point, and are continuously adjusted and optimized based on production experience. According to the time intervals of different lubrication points, the control program is written in the control system 10 to achieve automatic lubrication.

[0083] This lubrication method uses the coordinated action of multiple functional components such as automatic detection, pressure regulation, branch selection, and flow monitoring of the centralized lubrication device to make the lubrication operation efficient, safe, and accurate. The centralized lubrication device can automatically adjust the lubrication pressure, select the lubrication points, and adjust the oil injection amount of each lubrication point, effectively reducing the labor intensity of workers and is suitable for underground coal mines with harsh environments and high reliability requirements.

[0084] The present invention also proposes a method for detecting blockage and bursting in the centralized lubrication device. The oil distribution valve in the control box 29 has a plurality of third oil outlets 60, which are respectively connected to the lubrication points through the lubrication branches 3. During the automatic lubrication process, the lubrication branches 3 may be blocked, burst or leak.

[0085] Based on the control box 29 of the present invention, a method for detecting blockage of the lubrication branch 3 is proposed: when pressure is detected in the main lubrication pipeline, and the control system 10 does not detect the pulse signal of the magnetic switch 55, it means that the magnetic valve core 57 cannot move left and right, and there is no flow in the volumetric flowmeter 34, indicating that the lubrication branch 3 corresponding to the third oil outlet 60 is blocked.

[0086] A second pressure sensor can be provided at the second oil outlet 59 of the volumetric flowmeter 34, and the second pressure sensor is connected to the electrical control module 41, and further connected to the control system 10. Based on this, a burst detection method for the lubrication branch 3 is proposed. When the second electric actuator 37 controls the oil distribution valve 33 to select a lubrication point and connect the corresponding lubrication branch 3, the second oil outlet 59 is connected to the lubrication branch 3. If the pressure measured by the second pressure sensor drops sharply to near zero, the lubrication branch 3 bursts, and the control system alarms. Pressure sensors can also be provided on each lubrication branch 3 to detect leakage of the lubrication branch 3.

[0087] The method for detecting blockage and bursting enhances the ability of the centralized lubrication device to respond quickly to unexpected damage, reduces the negative impact of blockage and bursting of the lubrication branch 3 on the lubrication effect of the lubrication point, and improves the reliability of the centralized lubrication device.

Claims

1. A centralized lubrication device for coal mines, characterized in that: The centralized lubrication device for coal mines comprises: An oil distribution system, the oil distribution system is connected to the main lubrication pipeline of the lubrication device and multiple lubrication points in the coal mine, and the oil distribution system is configured to distribute the lubricating oil / grease in the main lubrication pipeline to the multiple lubrication points; a lubrication system, the lubrication system comprising a second oil tank and a second lubrication pump, the second lubrication pump being used to pump lubricating oil / grease in the second oil tank into the main lubrication pipeline to maintain the pressure of the main lubrication pipeline, the second oil tank comprising a liquid level detection device; an oil replenishing system, the oil replenishing system being connected to the second oil tank and being used for replenishing lubricating oil / grease into the second oil tank; A control system, wherein the control system is electrically connected to the oil distribution system, the lubrication system and the oil replenishment system, and is used to coordinate the work of each system.

2. The centralized lubrication device according to claim 1, characterized in that: The liquid level detection device includes a first travel switch and a second travel switch, wherein the first travel switch is triggered when the lubricating oil / grease in the second oil tank reaches a maximum limit, and the second travel switch is triggered when the lubricating oil / grease in the second oil tank reaches a minimum limit. The first travel switch and the second travel switch are connected to the control system.

3. The centralized lubrication device according to claim 2, characterized in that: The first travel switch and the second travel switch are both fixedly connected to the top plate of the second oil tank.

4. The centralized lubrication device according to claim 2, characterized in that: The liquid level detection device includes a liquid level indicator, which includes a liquid level follower cover and a vertical rod. The liquid level follower cover is configured to float on the upper surface of the lubricating oil / grease in the second oil tank, and the vertical rod is vertically connected to the top of the liquid level follower cover, and the end of the vertical rod extends from the top plate of the second oil tank.

5. The centralized lubrication device according to claim 4, characterized in that: A low liquid level trigger head is arranged at the end, the low liquid level trigger head is higher than the second travel switch, and an inclined second shoulder is arranged at the bottom of the low liquid level trigger head.

6. The centralized lubrication device according to claim 4, characterized in that: The liquid level detection device includes a high liquid level push rod, which passes through the top plate of the second oil tank. The high liquid level push rod is configured to be lifted up by the liquid level follower cover and trigger the first travel switch when the lubricating oil / grease in the second oil tank reaches a maximum limit.

7. The centralized lubrication device according to claim 6, characterized in that: The high liquid level push rod comprises a high liquid level trigger head at the top thereof, the high liquid level trigger head is lower than the first travel switch, and a first shoulder inclined upward is arranged on the top of the high liquid level trigger head.

8. The centralized lubrication device according to claim 4, characterized in that: The liquid level follower cover is disc-shaped, and the edge of the liquid level follower cover is airtightly fitted to the inner wall of the second oil tank.

9. The centralized lubrication device according to claim 1, characterized in that: The lubrication system includes a first pressure sensor, the first pressure sensor is connected to the main lubrication pipeline, the first pressure sensor is connected to the control system, and the first pressure sensor is used to measure the pressure of the main lubrication pipeline and feed back to the control system. The lubrication system comprises an overflow valve, and the overflow valve connects the main lubrication oil circuit and the second oil tank.

10. The centralized lubrication device according to claim 1, characterized in that: The oil replenishment system includes an oil replenishment pipeline, and the oil replenishment system is connected to the second oil tank through the oil replenishment pipeline. The oil replenishment system comprises a first oil tank and a first lubrication pump, wherein the first lubrication pump is connected to the first oil tank and is used to pump the lubricating oil / grease in the first oil tank into the oil replenishment pipeline. The first pressure gauge is connected to the oil replenishment pipeline and is used to display the pressure of the oil replenishment pipeline.

11. The centralized lubrication device according to claim 1, characterized in that: The oil distribution system includes one or more control boxes, which are connected to the main lubrication pipeline through the ball valve and filter provided therein, and the control box includes a switch valve, an oil distribution valve, a first electric actuator, a second electric actuator and a plurality of lubrication branches. The plurality of lubrication branches are connected to a plurality of lubrication points in the coal mine; The oil distribution valve has a plurality of third oil outlets, the third oil outlets are connected to the plurality of lubrication points through the lubrication branch, and each of the third oil outlets is connected to at least one lubrication point; The first electric actuator is connected to the switch valve to control the on-off of the oil circuit of the electric control box, and the second electric actuator is connected to the oil distribution valve to select the lubrication branch; The control box includes a displacement sensor, and the displacement sensor is connected to the valve core of the oil separation valve; The control box includes an electrical control module, which is connected to the control system via a POWERBUS bus for signal transmission and power supply; The electrical control module is respectively connected to the first electric actuator, the displacement sensor and the second electric actuator through a second communication line; The control box includes a first display screen, a first button, a shock-resistant pressure gauge, a wiring terminal and an explosion-proof housing.

12. The centralized lubrication device according to claim 11, characterized in that: The control box includes a magnetic switch and a volumetric flow meter, and the volumetric flow meter is connected to the control system and is used to measure the flow of lubricating oil / grease; The volumetric flow meter comprises a magnetic valve core and a valve body, The probe of the magnetic switch is arranged toward the magnetic valve core, The magnetic switch is connected to the electrical control module and is used to feed back a trigger signal of the magnetic switch.

13. The centralized lubrication device according to any one of claims 1 to 12, characterized in that: The control system includes a host computer and an electric control box, the electric control box is electrically connected to the host computer, and the electric control box is used to receive detection signals and issue control instructions. The electric control box comprises a second display screen and a second button for controlling automatic lubrication.

14. A lubrication method performed by the centralized lubrication device according to claim 1, characterized in that: The centralized lubrication device for coal mines comprises: The main lubrication pipeline is provided with a first pressure sensor, the first pressure sensor is connected to the control system, and the first pressure sensor is used to measure the pressure of the main lubrication pipeline and feed back to the control system; The normal working pressure range of the main lubrication pipeline has a preset upper threshold value and a preset lower threshold value; The centralized lubrication device comprises a relief valve, the relief valve connects the main lubrication oil circuit and the second oil tank, and the set pressure of the relief valve is the upper threshold value; The oil distribution system includes one or more control boxes, which are connected to the main lubrication pipeline through the ball valve and filter provided therein, and the control box includes a switch valve, an oil distribution valve, a first electric actuator, a second electric actuator and a plurality of lubrication branches. The plurality of lubrication branches are connected to a plurality of lubrication points in the coal mine; The first electric actuator is connected to the switch valve to control the on-off of the oil circuit of the electric control box, and the second electric actuator is connected to the oil distribution valve to select the lubrication branch; The control box includes a volumetric flow meter, which is connected to the control system and is used to measure the flow rate of lubricating oil / grease; The steps of the lubrication method include: Ⅰ. System self-check: Start the control system to perform self-check and check the working status of the centralized lubrication device; Ⅱ.Pressure monitoring and regulation: ⅰ. Using the first pressure sensor to measure the pressure of the main lubrication pipeline, when the pressure is lower than the lower threshold, the control system controls the lubrication system to add lubricating oil / grease to the main lubrication pipeline until the pressure reaches above the lower threshold; ⅱ. When the pressure of the main lubrication line exceeds the upper threshold value, the overflow valve automatically opens and overflows to the second oil tank; Ⅲ. Lubrication point control: ⅰ. The control system issues an instruction to select the lubrication branch corresponding to the lubrication point that needs lubrication through the second electric actuator; ⅱ start the first electric actuator to open the switch valve, start to fill the selected lubrication point; IV. Flow monitoring and stopping: The volumetric flow meter sends a pulse signal to the control system every time a fixed volume of lubricating oil passes through. When the accumulated number of pulse signals reaches a set value, the control system closes the switch valve to stop oil injection, otherwise lubrication continues until the set value is reached.

15. A method for detecting lubrication branch blockage and burst in the centralized lubrication device according to claim 12, characterized in that: The centralized lubrication device for coal mines comprises: A second pressure sensor is provided at the second oil outlet of the volumetric flow meter, and the second pressure sensor is connected to the control system; The blockage detection method comprises the following steps: during the lubrication of the lubrication point, when pressure is detected in the main lubrication pipeline but no pulse signal of the magnetic switch is detected, it indicates that the magnetic valve core cannot move left or right, and it is determined that the lubrication branch corresponding to the third oil outlet is blocked; The steps of the burst detection method include: during the lubrication process of the lubrication point, when the oil distribution valve is connected to the lubrication branch corresponding to the lubrication point, the second pressure sensor at the second oil outlet is connected to the lubrication branch, and if the pressure measured by the second pressure sensor is close to zero, it is determined that the lubrication branch has burst.

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