A control device for a dry oil

Abstract

The utility model discloses a control device of dry oil, through pressure sensor to the oil supply pipeline pressure is monitored, and according to the pressure data control of PLC control device to oil device start -stop and oil switch opening and closing, realized the transformation of dry oil supply from manual operation to closed -loop automatic control, ensured the accuracy and timeliness of lubrication, avoided the problem of insufficient lubrication or over lubrication, second, the modularization, distributed structure design makes the system can flexible adaptation different scale equipment lubrication demand, and each distribution box is independently controlled, and it is convenient to carry out local maintenance or adjustment without affecting the overall system operation, improved the maintainability and expandability of system, finally, this kind of automatic control mode not only greatly reduced the equipment wear and tear risk caused by improper lubrication management, prolonged the service life of equipment, also reduced the manpower investment and lubricating grease waste.

Description

Technical Field

[0001] This utility model relates to the field of mechanical design, and in particular to a control device for drying oil. Background Technology

[0002] With the rapid development of industrial automation, lubrication management of mechanical equipment is becoming increasingly important for ensuring efficient operation, extending service life, and reducing maintenance costs. Automatic lubrication control devices, through automation technology and precision control components, automatically add lubricating grease according to preset rules, thus addressing some of the shortcomings of manual lubrication. Their core technologies include precise flow control, a reliable drive system, intelligent control algorithms, and efficient sensor monitoring, enabling timed and quantitative oil supply and dynamic adjustment of lubrication behavior based on the actual operating conditions of the equipment.

[0003] However, existing automatic lubrication control devices still suffer from the following prominent problems: the software program is encrypted, preventing users from accessing or modifying it; hardware and software failures rely on the original manufacturer for handling, leading to long maintenance cycles and significant downtime losses; core spare parts are proprietary and tightly bound to the control system, making them incompatible with alternatives, resulting in limited procurement channels and high costs; system expansion is limited, making it difficult for users to customize modifications to meet their needs, requiring additional investment and supplier technical support; the control system has a complex structure and cumbersome logic, resulting in numerous potential failure points, difficult troubleshooting, extended processing time, and low maintenance efficiency. These problems severely restrict the flexible application and economical operation of automatic lubrication systems. Utility Model Content

[0004] The purpose of this invention is to provide a control device for dry lubrication. Through closed-loop control of a pressure sensor and a PLC control device, the automatic and efficient operation of the dry lubrication system is realized, overcoming the unreliability of manual lubrication, improving the lubrication quality of the equipment, and reducing maintenance costs.

[0005] To solve the above-mentioned technical problems, this utility model provides a control device for dried oil, comprising:

[0006] Multiple distribution boxes and multiple oil supply switches are provided. The multiple distribution boxes are set independently, and the input end of each distribution box is connected to the oil supply pipeline through the corresponding oil supply switch.

[0007] A pressure sensor, installed on the oil supply pipeline, is used to detect the oil supply pressure on the oil supply pipeline;

[0008] A PLC control device is connected to the pressure sensor, and its output terminal is connected to the control terminal of the oil supply device. It is used to control the start and stop of the oil supply device and the opening or closing of each oil supply switch according to the oil supply pressure.

[0009] The oil supply device is connected to the oil supply pipeline and is used to deliver dry oil to the oil supply pipeline under the control of the PLC control device in order to regulate the oil supply pressure of the oil supply pipeline.

[0010] Preferably, each of the distribution boxes is provided with multiple lubrication points, and each lubrication point is provided with an independent sub-switch; for each sub-switch, its control terminal is connected to the PLC control device, its input terminal is connected to the output terminal of the corresponding oil supply switch through the oil supply pipeline, and its output terminal is connected to the corresponding lubrication point.

[0011] The sub-switch is used to open or close under the control of the PLC control device to independently adjust the oil supply status of the corresponding lubrication point.

[0012] Preferably, the PLC control device includes a PLC control module, an oil supply coil corresponding to the oil supply device, and a contactor; the oil supply coil is connected to the PLC control module, and the contactor is located between the power supply and the oil supply device;

[0013] The oil supply coil is energized when the PLC control module issues a start command and de-energized when the PLC control module issues a stop command.

[0014] The contactor is used to close when the oil supply coil is energized and to open when the oil supply coil is de-energized.

[0015] Preferably, the oil supply switch includes a first coil and a first contact corresponding to the first coil;

[0016] The first coil is connected to the PLC control module and is used to be energized when the corresponding distribution box needs oil supply and de-energized when oil supply is not required.

[0017] The first contact is connected to the oil supply pipeline and located between the oil supply device and the corresponding distribution box, and is used to close when the corresponding first coil is energized and open when it is de-energized.

[0018] Preferably, the oil supply device includes a motor and a dry oil pump. The motor is connected to the output terminal of the PLC control device and drives the dry oil pump to supply dry oil to the oil supply pipeline.

[0019] Preferably, it also includes a liquid level sensor and a display module;

[0020] The liquid level sensor is installed in the oil storage tank of the dry oil pump to detect the dry oil level and is connected to the PLC control device for signal transmission.

[0021] The display module is connected to the PLC control device and is used to display the liquid level data detected by the liquid level sensor and the pressure data detected by the pressure sensor.

[0022] Preferably, it also includes an audible and visual alarm, which is connected to the signal output terminal of the PLC control device and fixed to the outer wall of the distribution box; the audible and visual alarm is used to receive the trigger signal from the PLC control device and provide an audible and visual alert when the pressure sensor detects an abnormal pressure.

[0023] Preferably, the PLC control device further includes a spare control interface, which is exposed outside the housing of the PLC control device and is used to connect an external expansion control module.

[0024] Preferably, it also includes a plurality of first shut-off valves, each of which is disposed one-to-one between the input end of the oil supply switch and the oil supply pipeline.

[0025] Preferably, it further includes a second shut-off valve and a filter arranged in series, wherein the second shut-off valve and the filter are jointly disposed between the oil supply device and the common connection end of the plurality of first shut-off valves.

[0026] This application provides a dry oil control device. A pressure sensor monitors the pressure in the oil supply pipeline, and a PLC control unit controls the start / stop of the oil supply device and the opening / closing of the oil supply switch based on the pressure data. This transforms dry oil supply from manual operation to closed-loop automatic control, ensuring accurate and timely lubrication and avoiding problems of insufficient or excessive lubrication. Secondly, the modular and distributed structural design allows the system to flexibly adapt to the lubrication needs of equipment of different sizes. Each distribution box is independently controlled, facilitating local maintenance or adjustment without affecting the overall system operation, thus improving the system's maintainability and scalability. Finally, this automated control mode not only significantly reduces the risk of equipment wear caused by improper lubrication management and extends equipment lifespan, but also reduces manpower input and lubricant waste. Attached Figure Description

[0027] To more clearly illustrate the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A simplified block diagram of a dry oil control device provided by this utility model;

[0029] Figure 2 A detailed schematic diagram of a dry oil control device provided by this utility model;

[0030] Figure 3A schematic diagram of a PLC control cabinet provided by this utility model;

[0031] Figure 4 A schematic diagram of a PLC control module provided by this utility model;

[0032] Figure 5 This is a schematic diagram of a relay control principle provided by the present invention;

[0033] Figure 6 This is a schematic diagram of the principle of a dry oil pump motor provided by this utility model;

[0034] Figure 7 A wiring diagram for a relay inside a PLC cabinet provided by this utility model;

[0035] Figure 8 This utility model provides a wiring diagram for a distribution box relay. Detailed Implementation

[0036] The core of this invention is to provide a control device for dry lubrication. Through closed-loop control of a pressure sensor and a PLC control device, the automatic and efficient operation of the dry lubrication system is realized, overcoming the unreliability of manual lubrication, improving the lubrication quality of the equipment, and reducing maintenance costs.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] like Figure 1 This application provides a control device for dry oil, comprising:

[0039] Multiple distribution boxes 11 and multiple oil supply switches 12 are provided. The multiple distribution boxes 11 are set independently, and the input end of each distribution box 11 is connected to the oil supply pipeline through the corresponding oil supply switch 12.

[0040] Pressure sensor 13 is installed on the oil supply pipeline to detect the oil supply pressure on the oil supply pipeline;

[0041] The PLC control device 15 is connected to the pressure sensor 13, and its output terminal is connected to the control terminal of the oil supply device 14. It is used to control the start and stop of the oil supply device 14 and the opening or closing of each oil supply switch 12 according to the oil supply pressure.

[0042] The oil supply device 14 is connected to the oil supply pipeline and is used to deliver dry oil to the oil supply pipeline under the control of the PLC control device 15 in order to regulate the oil supply pressure of the oil supply pipeline.

[0043] In this embodiment, multiple distribution boxes 11 and multiple oil supply switches 12 are arranged in parallel on each branch of the oil supply pipeline. Each distribution box 11 is independently set up, and its input end is connected to the oil supply pipeline through a corresponding oil supply switch 12. Dry oil is transported from the oil supply device 14 to each distribution box 11 through the oil supply pipeline. The distribution box 11, as a local oil supply unit, is responsible for distributing the dry oil from the oil supply pipeline to the parts to be lubricated. Each oil supply switch 12 is located at the input end of the distribution box 11 and is turned on and off by a mechanical or electromagnetic drive mechanism. Closing the oil supply switch 12 allows oil to flow into the corresponding distribution box 11, and opening the oil supply switch 12 cuts off the oil supply path of that branch, thereby achieving selective control of the oil supply to each distribution box 11 at the physical level. In this embodiment, the independent setting of the distribution box 11 and the oil supply switch 12 ensures that different lubrication points can receive or stop oil supply independently according to their own needs, and there is no necessary coupling relationship between the distribution boxes 11, which is convenient for configuration or replacement as needed. The specific structure of the distribution box 11 is not limited. The internal structure of the distribution box 11 may include, but is not limited to, simple flow channels, throttling devices or buffer chambers to adapt to dry oils of different viscosities.

[0044] In this embodiment, a pressure sensor 13 is installed on the oil supply pipeline to detect the oil supply pressure in real time. The pressure value collected by the pressure sensor 13 is sent to the PLC control device 15 as the sole or primary operating condition quantity for control judgment. The pressure sensor 13 can be, but is not limited to, a pressure transmitter, a pressure switch, or other forms of pressure detection element. Its output can be an analog quantity, voltage, current, or switching quantity. The PLC control device 15 performs criterion comparison and control decision based on the received pressure signal. Placing the pressure sensor 13 on the oil supply pipeline can reflect the overall pressure status when the oil supply device 14 supplies oil to the entire parallel distribution box 11 network. Moreover, the pressure value can indirectly reflect the opening status and loop flow status of each distribution box 11, thereby providing necessary feedback information for subsequent control logic.

[0045] In this embodiment, the PLC control device 15 is connected to the pressure sensor 13, and its output terminal is connected to the control terminals of the oil supply device 14 and each oil supply switch 12. The PLC control device 15 receives the measured value from the pressure sensor 13 and determines the control output based on a preset pressure criterion. For example, when the oil supply pressure is lower than a preset threshold, the PLC control device 15 can control the oil supply device 14 to start to supplement the pipeline pressure; when the oil supply pressure reaches or exceeds the preset threshold, the PLC control device 15 can control the oil supply device 14 to stop to avoid overpressure; at the same time, the PLC control device 15 opens or closes the corresponding oil supply switch 12 according to a predefined logic, so that each distribution box 11 is selectively connected or isolated according to the actual oil supply demand. The control signal sent by the PLC control device 15 to the oil supply switch 12 can be, but is not limited to, digital switch signals or execution signals amplified by a driver, while the control sent to the oil supply device 14 can be, but is not limited to, start / stop commands or frequency / flow adjustment commands. The PLC control device 15 realizes closed-loop start / stop and switch distribution according to the pressure change trend and set rules.

[0046] In this embodiment, the oil supply device 14 is connected to the oil supply pipeline and is used to deliver dry oil to the oil supply pipeline under the control of the PLC control device 15 to regulate the oil supply pressure of the oil supply pipeline. The oil supply device 14 acts as an oil source, operating according to the control commands of the PLC control device 15. Its operating state directly affects the pressure fluctuations and steady-state values ​​of the oil supply pipeline. The oil supply device 14 replenishes oil to the pipeline during startup to bring the pressure back to the desired range, and cuts off the supply during shutdown to maintain or reduce the pressure to the target range. The output of the oil supply device 14 and each distribution box 11, through the oil supply switch 12, jointly determine the final actual oil supply distribution to each distribution box 11. In this embodiment, the entire control loop uses the oil supply pipeline pressure as the feedback quantity, the PLC control device 15 as the central judgment and command unit, the pressure sensor 13 provides real-time measurement, and the oil supply device 14 and the oil supply switch 12, as execution units, jointly realize the response and adjustment of the oil supply pipeline pressure and the oil supply status of each distribution box 11.

[0047] like Figure 2 , Figure 2 The lubrication points 1-4 in the diagram are the lubrication points in this embodiment. In a preferred embodiment, each distribution box 11 is provided with multiple lubrication points, and each lubrication point is provided with an independent sub-switch. For each sub-switch, its control terminal is connected to the PLC control device 15, its input terminal is connected to the output terminal of the corresponding oil supply switch 12 via an oil supply pipe, and its output terminal is connected to the corresponding lubrication point. The sub-switch is used to open or close under the control of the PLC control device 15 to independently adjust the oil supply status of the corresponding lubrication point.

[0048] In this embodiment, each distribution box 11 is provided with multiple lubrication points, and each lubrication point is provided with an independent sub-switch. The input end of the sub-switch is connected to the output end of the corresponding oil supply switch 12 through an oil supply pipe, and its output end is connected to the corresponding lubrication point, which is used to realize the on / off control of a single lubrication point in the physical path. The oil supply switch 12 is responsible for selecting whether to supply oil to the entire distribution box 11, while the sub-switch further controls each lubrication point point by point inside the distribution box 11, so that different lubrication points in the same distribution box 11 can be opened or isolated according to actual lubrication needs.

[0049] In this embodiment, the control terminal of each sub-switch is connected to the PLC control device 15. The PLC control device 15 outputs control commands to the sub-switches according to pressure feedback, preset timing, or other control rules, causing the sub-switches to open or close at a specified time. The structure of the sub-switches can be, but is not limited to, solenoid valves, miniature switching valves, or other drive elements capable of switching on and off. With the above structure, the oil supply status of different lubrication points can be adjusted individually. Even if they are located in the same distribution box 11, they will not be passively supplied with oil due to the opening of the overall passage, thereby realizing a more granular lubrication management strategy.

[0050] In a preferred embodiment, the PLC control device 15 includes a PLC control module, an oil supply coil corresponding to the oil supply device 14, and a contactor; the oil supply coil is connected to the PLC control module, and the contactor is located between the power supply and the oil supply device 14; Figure 2 It is not indicated in the text. Figure 3 The document provides a simple description of the relative positions of the various modules (such as relays and contactors), but does not describe the specific connection relationships.

[0051] The oil supply coil is energized when the PLC control module issues a start command and de-energized when the PLC control module issues a stop command.

[0052] The contactor is used to close when the oil supply coil is energized and to open when the oil supply coil is de-energized.

[0053] like Figure 4 The PLC control device 15 can specifically be a PLC control cabinet, such as... Figure 4 As shown. Figure 7 and Figure 8 This is a schematic diagram showing the distribution of the corresponding relays; it is for illustrative purposes only.

[0054] In this embodiment, the PLC control device 15 includes a PLC control module, an oil supply coil corresponding to the oil supply device 14, and a contactor. The PLC control module, acting as a logic control unit, outputs start or stop commands to the oil supply coil. The oil supply coil is electrically connected to the PLC control module and is essentially an electromagnetic drive element. When the PLC control module issues a start command, the oil supply coil is energized and generates electromagnetic attraction; when the PLC control module issues a stop command, the oil supply coil is de-energized and returns to its non-engaged state. The structure of the oil supply coil can be, but is not limited to, an AC coil, a DC coil, or other coil components capable of achieving electromagnetic engagement.

[0055] In this embodiment, the contactor is positioned between the power supply and the lubrication device 14, and its operation is controlled by the energization of the lubrication coil. When the lubrication coil is energized, the contactor is attracted and closes the power circuit, connecting the power supply to the lubrication device 14, thus starting the operation of the lubrication device 14. When the lubrication coil is de-energized, the contactor releases and disconnects the power circuit, stopping the operation of the lubrication device 14. The contactor can be, but is not limited to, a common power contactor or a small control contactor, and its contact capacity only needs to meet the power supply requirements of the lubrication device 14. In this embodiment, through the linkage between the lubrication coil and the contactor, the PLC control module can control the energization and de-energization of the lubrication device 14 with low-voltage control signals, and directly manage the operating status of the lubrication device 14 by switching the power circuit.

[0056] like Figure 5 , Figure 5 The principle of a relay is illustrated.

[0057] In a preferred embodiment, the oil supply switch 12 includes a first coil and a first contact corresponding to the first coil;

[0058] The first coil is connected to the PLC control module and is used to be energized when the corresponding distribution box 11 needs to be supplied with oil and de-energized when oil supply is not required.

[0059] The first contact is connected to the oil supply pipeline and located between the oil supply device 14 and the corresponding distribution box 11, and is used to close when the corresponding first coil is energized and open when it is de-energized.

[0060] like Figure 2 KA27, KA28...KA44 in the diagram represent the first coils corresponding to the distribution box 11, and the first contact is located at... Figure 2Not shown in the diagram. In this embodiment, the oil supply switch 12 includes a first coil and a first contact corresponding to the first coil. The first coil is connected to the PLC control module. When the PLC control module determines that the corresponding distribution box 11 is in an oil supply demand state, it outputs an energizing command to the first coil, causing the first coil to be in an engaged state; when the PLC control module determines that the distribution box 11 does not need oil supply, it outputs a de-energizing command to the first coil, causing the coil to be in a released state. The first coil can be constructed as, but is not limited to, an AC coil, a DC coil, or other electromagnetic coils capable of driving the contact to operate, and its working state directly determines the on / off state of the first contact.

[0061] In this embodiment, the first contact is connected in series on the oil supply pipeline, located between the oil supply device 14 and the corresponding distribution box 11, and is closed or opened according to the state of the first coil. When the first coil is energized, the first contact is attracted and closed, connecting the oil supply pipeline to the corresponding distribution box 11, allowing dry oil to flow into the distribution box 11; when the first coil is de-energized, the first contact is opened, cutting off the oil supply path, and isolating the distribution box 11 from the oil supply pipeline. With this structure, each distribution box 11 can independently decide whether to connect to the oil supply path through its own oil supply switch 12. This embodiment achieves direct control of the oil supply path of each distribution box 11 based on the on / off state of mechanical contacts. The contact form can be, but is not limited to, normally open contacts or other structures that can achieve the same on / off function.

[0062] like Figure 2 and Figure 6 In a preferred embodiment, the oil supply device 14 includes a motor and a dry oil pump. The motor is connected to the output terminal of the PLC control device 15 and drives the dry oil pump to supply dry oil to the oil supply pipeline.

[0063] In this embodiment, the oil supply device 14 includes a motor and a dry oil pump. The motor is connected to the output terminal of a PLC control device 15. The PLC control device 15 outputs start or stop signals to the motor. The motor is powered on and runs when it receives a start signal, and is powered off and stops when it receives a stop signal. The motor can be, but is not limited to, a three-phase asynchronous motor, a DC motor, or a servo motor. Its main function is to provide driving torque so that the dry oil pump can perform delivery operations under stable mechanical power. The connection between the motor and the PLC control device 15 can be achieved through relays, contactors, or drive modules to ensure that the motor operates as expected under the PLC's commands.

[0064] In this embodiment, the dry oil pump is connected to and driven by the motor, and its outlet is connected to the oil supply pipeline. When the motor is running, the dry oil pump is driven to rotate, and the internal pump chamber creates a suction and pressure delivery effect, drawing dry oil from the storage tank and delivering it to the oil supply pipeline, thereby providing dry oil pressure to the entire oil supply network. When the motor stops running, the dry oil pump stops outputting, and the pressure in the oil supply pipeline is maintained by the remaining oil volume inside or gradually decreases. The structure of the dry oil pump can be, but is not limited to, a gear pump, a plunger pump, or other pump types suitable for conveying high-viscosity dry oil. In this embodiment, the combination of the motor and the dry oil pump enables the PLC control device 15 to directly establish or release the oil supply pressure through electrical control, and provides a power source for the subsequent pressure regulation process.

[0065] In a preferred embodiment, the system also includes a liquid level sensor and a display module;

[0066] The level sensor is located in the oil storage tank of the dry oil pump to detect the dry oil level and is connected to the PLC control device 15 via signal.

[0067] The display module is connected to the PLC control device 15 and is used to display the liquid level data detected by the liquid level sensor and the pressure data detected by the pressure sensor 13.

[0068] In this embodiment, a level sensor is installed inside the oil storage tank of the dry oil pump to detect the level of dry oil in the tank. The level sensor is connected to the PLC control device 15, and its output can be, but is not limited to, analog, voltage, current, or switching signals. The PLC control device 15 identifies whether the oil storage tank is at a normal level, a low level, or is close to empty based on the level data fed back by the sensor. The specific structure of the level sensor can be float type, ultrasonic type, capacitive type, etc., as long as it can reflect the level height in the oil storage tank. In this embodiment, through real-time detection by the level sensor, the PLC control device 15 can determine whether the feeding conditions of the dry oil pump are met, thereby ensuring that the oil supply device 14 operates under the premise of having the oil supply medium available.

[0069] This embodiment further includes a display module connected to the PLC control device 15 to display the liquid level data detected by the liquid level sensor and the pressure data detected by the pressure sensor 13. The display module can be, but is not limited to, a touchscreen, a digital tube display, or an industrial display panel. The PLC control device 15 outputs the collected liquid level and pressure values ​​to the display module in real time, allowing the operator to intuitively view the current status of the dry oil level and the oil supply pipeline pressure. Through this structure, the PLC control device 15 becomes the central unit for data aggregation and output, while the display module is only responsible for presenting the data and does not participate in the control logic. This embodiment, through the combination of the liquid level sensor and the display module, enables the operating status of the dry oil level and oil supply pressure to be presented visually, facilitating monitoring and judgment by personnel.

[0070] As a preferred embodiment, it also includes an audible and visual alarm, which is connected to the signal output terminal of the PLC control device 15 and fixed to the outer wall of the distribution box 11; the audible and visual alarm is used to receive the trigger signal from the PLC control device 15 and provide audible and visual prompts when the pressure sensor 13 detects an abnormal pressure.

[0071] In this embodiment, an audible and visual alarm is installed and connected to the signal output terminal of the PLC control device 15. The audible and visual alarm is fixed to the outer wall of the distribution box 11, and its installation method can be, but is not limited to, screw fixing, bracket fixing, or snap-on installation. The audible and visual alarm itself does not perform pressure judgment; it only enters the working state when it receives a trigger signal output by the PLC control device 15. The PLC control device 15 determines whether the current oil supply pressure is abnormal based on the detection results of the pressure sensor 13. When abnormal conditions such as high pressure or low pressure occur, the PLC control device 15 outputs an alarm command to the audible and visual alarm, causing it to produce an audible and flashing warning.

[0072] In this embodiment, the alarm method of the audible and visual alarm can be, but is not limited to, a buzzing sound, a flashing warning light, or a combination of both. Since the audible and visual alarm is located on the outer wall of the distribution box 11, personnel on-site can directly see or hear the alarm signal, facilitating immediate identification of whether the oil supply pressure has been abnormally affected. The audible and visual alarm relies entirely on the trigger signal of the PLC control device 15; it does not require internal processing of pressure data, thus maintaining the alarm indication function independently and clearly separating it from the control logic.

[0073] In a preferred embodiment, the PLC control device 15 further includes a backup control interface, which is exposed outside the housing of the PLC control device 15 and is used to connect to an external expansion control module 16.

[0074] In this embodiment, the PLC control device 15 is provided with a spare control interface, which is exposed outside the housing of the PLC control device 15, allowing it to be directly connected to the external expansion control module 16 without disassembling the internal structure of the PLC control device 15. The port form of the spare control interface can be, but is not limited to, terminal blocks, industrial plugs, or standard communication interfaces, as long as a stable electrical connection can be established with the external expansion control module 16. By exposing this interface on the outside of the housing, this embodiment ensures that subsequent expansion functions do not depend on internal modifications to the PLC control device 15, maintaining the integrity of the original control structure.

[0075] In this embodiment, the backup control interface serves as a reserved expansion entry point for the PLC control device 15, providing signal input, output, or communication channels for the external expansion control module 16. The external expansion control module 16 can connect to the PLC control device 15 through this interface to achieve additional functions such as data acquisition, control output, or communication interconnection. Since the backup control interface itself does not participate in the core control flow of the PLC control device 15 but serves as an optional external connection point, users can decide whether to connect the external expansion control module 16 according to their actual needs, thus enabling this embodiment to have flexible external connection capabilities while maintaining the basic functions.

[0076] like Figure 1 In a preferred embodiment, it also includes a plurality of first shut-off valves, each of which is disposed between the input end of the oil supply switch 12 and the oil supply pipeline.

[0077] In this embodiment, multiple first shut-off valves are provided, and each first shut-off valve is arranged one-to-one between the input end of the oil supply switch 12 and the oil supply pipeline. The first shut-off valve is located upstream of the oil supply path, and its function is to manually or mechanically cut off the oil supply path entering the corresponding oil supply switch 12. The form of the first shut-off valve can be, but is not limited to, a ball valve, a gate valve, or a needle valve, as long as it can achieve complete opening or complete closing of the pipeline section. In this embodiment, by configuring an independent first shut-off valve for each oil supply switch 12, the upstream oil supply path of the corresponding distribution box 11 has controllable isolation capability.

[0078] In this embodiment, the first shut-off valve is not electrically connected to the PLC control device 15, but serves as an independent manual or independent drive element to cut off the upstream oil circuit of a specific distribution box 11 during maintenance, repair, or troubleshooting. When the first shut-off valve is closed, even if the corresponding oil supply switch 12 is in the closed state, dry oil cannot flow into the distribution box 11; when the first shut-off valve is open, its oil supply path returns to normal, and the oil supply switch 12 can continue to supply oil according to predetermined logic under PLC control. This embodiment, by setting corresponding first shut-off valves for the branches of the oil supply pipeline, enables each distribution box 11 to be independently closed mechanically when isolation is required, without affecting the normal oil supply of other distribution boxes 11.

[0079] like Figure 1 In a preferred embodiment, it also includes a second shut-off valve and a filter arranged in series, the second shut-off valve and the filter being located between the oil supply device 14 and the common connection end of the plurality of first shut-off valves.

[0080] In this embodiment, a second shut-off valve and a filter are provided and arranged in series between the oil supply device 14 and the common connection end of multiple first shut-off valves. The second shut-off valve is located on the main oil supply passage and can be manually or independently driven to open or close the entire output passage of dry oil. The structure of the second shut-off valve can be, but is not limited to, a ball valve, a gate valve, or other valves capable of completely cutting off the main oil passage. In this embodiment, by arranging the second shut-off valve at the common connection end, the main oil passage can be completely shut off when maintaining or repairing the oil supply device 14, the filter, or the multiple downstream distribution boxes 11.

[0081] In this embodiment, the filter and the second shut-off valve are connected in series. The filter is used to remove impurities in the oil circuit before the dry oil enters the multiple first shut-off valves, thereby maintaining the basic cleanliness of the main oil circuit. The filter structure can be, but is not limited to, a metal filter element, a mesh filter element, or a washable filter cartridge, as long as it can perform primary filtration of particulate impurities in the dry oil. The second shut-off valve and the filter are arranged together between the oil supply device 14 and each of the first shut-off valves, so that the filtration action acts on the entire main oil supply circuit, and the filter can be independently disassembled and cleaned by closing the second shut-off valve when necessary. This embodiment, through this series structure, concentrates the filtration function of the main oil circuit and the shut-off function of the main circuit in the same area, which facilitates unified management and maintenance.

[0082] Specifically, this embodiment is based on a vertical shaft furnace pelletizing process and a toothed roller lubrication system, designed with 72 lubrication points as a foundation. In practical applications, this application is first installed in the equipment's lubrication system, connecting the oil supply unit and the execution unit. Operating parameters are set via the control panel according to the different lubrication requirements of each lubrication point. The following description, with reference to the accompanying drawings, uses lubrication point 1 as an example to illustrate this application in detail; the working principles of other lubrication points are the same.

[0083] After the associated equipment starts running, relay KA26 inside the PLC control cabinet receives an interlock signal and sends a run command to the PLC control module, initiating system operation. First, the pressure sensor detects whether the oil pressure in the supply pipe meets the supply requirements. When the oil pressure is below 12 MPa, the PLC control module sends a dry oil pump start command, relay KA25 is energized, contactor 17 engages, and the dry oil pump starts running. When the oil pressure is above 18 MPa, the PLC control module 15 cancels the dry oil pump start command, relay KA25 is de-energized, contactor 17 disengages, and the dry oil pump stops running. When the system oil supply pressure meets the requirements, lubrication begins point-by-point. First, the PLC control module 15 issues a group command, energizing relay KA1 and closing its contacts. This energizes relay KA27, causing all four contacts of relay KA27 to close. Then, the PLC control module 15 issues a point command, energizing relay KA19 and the first contact of relay KA27. This energizes solenoid valve 10, causing lubrication point 1 to receive lubrication. The number of lubrication points at lubrication point 1 is completed according to the parameter settings. Among the relays, KA1-KA18 are group command relays, and KA19-KA22 are point command relays. All devices can be connected via terminal block 19. The lubrication principle for other lubrication points is the same as for lubrication point 1.

[0084] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0085] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control device for drying oil, characterized in that, include: Multiple distribution boxes and multiple oil supply switches are provided. The multiple distribution boxes are set independently, and the input end of each distribution box is connected to the oil supply pipeline through the corresponding oil supply switch. A pressure sensor, installed on the oil supply pipeline, is used to detect the oil supply pressure on the oil supply pipeline; A PLC control device is connected to the pressure sensor, and its output terminal is connected to the control terminal of the oil supply device. It is used to control the start and stop of the oil supply device and the opening or closing of each oil supply switch according to the oil supply pressure. The oil supply device is connected to the oil supply pipeline and is used to deliver dry oil to the oil supply pipeline under the control of the PLC control device in order to regulate the oil supply pressure of the oil supply pipeline.

2. The dry oil control device as described in claim 1, characterized in that, Each of the distribution boxes is provided with multiple lubrication points, and each lubrication point is provided with an independent sub-switch; for each sub-switch, its control terminal is connected to the PLC control device, its input terminal is connected to the output terminal of the corresponding oil supply switch through the oil supply pipeline, and its output terminal is connected to the corresponding lubrication point. The sub-switch is used to open or close under the control of the PLC control device to independently adjust the oil supply status of the corresponding lubrication point.

3. The dry oil control device as described in claim 1, characterized in that, The PLC control device includes a PLC control module, an oil supply coil corresponding to the oil supply device, and a contactor; the oil supply coil is connected to the PLC control module, and the contactor is located between the power supply and the oil supply device. The oil supply coil is energized when the PLC control module issues a start command and de-energized when the PLC control module issues a stop command. The contactor is used to close when the oil supply coil is energized and to open when the oil supply coil is de-energized.

4. The dry oil control device as described in claim 3, characterized in that, The oil supply switch includes a first coil and a first contact corresponding to the first coil; The first coil is connected to the PLC control module and is used to be energized when the corresponding distribution box needs oil supply and de-energized when oil supply is not required. The first contact is connected to the oil supply pipeline and located between the oil supply device and the corresponding distribution box, and is used to close when the corresponding first coil is energized and open when it is de-energized.

5. The dry oil control device as described in claim 1, characterized in that, The oil supply device includes a motor and a dry oil pump. The motor is connected to the output terminal of the PLC control device and drives the dry oil pump to supply dry oil to the oil supply pipeline.

6. The dry oil control device as described in claim 5, characterized in that, It also includes a liquid level sensor and a display module; The liquid level sensor is installed in the oil storage tank of the dry oil pump to detect the dry oil level and is connected to the PLC control device for signal transmission. The display module is connected to the PLC control device and is used to display the liquid level data detected by the liquid level sensor and the pressure data detected by the pressure sensor.

7. The dry oil control device as described in claim 1, characterized in that, It also includes an audible and visual alarm, which is connected to the signal output terminal of the PLC control device and fixed to the outer wall of the distribution box; the audible and visual alarm is used to receive the trigger signal from the PLC control device and provide an audible and visual alert when the pressure sensor detects an abnormal pressure.

8. The control device for dry oil as described in claim 1, characterized in that, The PLC control device also includes a backup control interface, which is exposed outside the housing of the PLC control device and is used to connect an external expansion control module.

9. The dry oil control device according to any one of claims 1-8, characterized in that, It also includes multiple first shut-off valves, each of which is located between the input end of the oil supply switch and the oil supply pipeline.

10. The control device for dry oil as described in claim 9, characterized in that, It also includes a second shut-off valve and a filter arranged in series, with the second shut-off valve and the filter located together between the oil supply device and the common connection end of the plurality of first shut-off valves.

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