Oil circuit pressure regulating control device for centralized lubrication oil supply system

Abstract

The oil circuit pressure regulating control device of the centralized lubrication oil supply system includes a pump housing, a power input component, a plunger component, a relief valve component, a pressure relief valve component and a controller; through innovative structural design, this solution optimizes the structural composition of the oil circuit pressure regulating control module of the centralized lubrication oil supply system, realizing an oil circuit pressure regulating control device integrated with a pump housing, a power input component, a plunger component, a relief valve component, a pressure relief valve component and a controller. This device can automatically control intermittent oil supply according to the signals inside the device, and according to the signals provided by the oil pressure sensor, maintain the pressure of the entire oil supply pipeline for an effective time, so that the lubricating oil in the oil circuit can fully reach the lubrication points in each branch, and actively control the pressure relief valve component through the controller to complete timely and effective pressure relief actions; this solution has the advantages of being simple, feasible and having good reliability, and can be applied to any conventional plunger pump oil supply system.

Description

Technical Field

[0001] The present invention relates to the technical field of centralized lubrication, and particularly to an oil circuit pressure regulating control device for a centralized lubrication oil supply system. Background Art

[0002] At present, the grease centralized lubrication technology is mainly applied to large vehicles, construction machinery, wind power generation, industrial production and other fields. Its function is to automatically pump grease to lubrication points as required by an oil pump to meet the lubrication requirements of corresponding moving pairs. The centralized lubrication oil supply system solves the deficiencies of traditional manual lubrication, can give lubrication regularly, at fixed points and quantitatively during the operation of machinery, greatly reduces the wear of machine parts, significantly reduces the usage amount of lubricating agents, and while being environmentally friendly and energy-saving, reduces the loss of machine parts and the time for maintenance and repair, and ultimately achieves the best effect of improving operating income.

[0003] During lubrication, the plunger pump continuously supplies oil and pressurizes the pipeline during operation. The oil pressure of the pipeline can be controlled by the preset pressure of the overflow valve. When the pressure exceeds the predetermined pressure, the grease can return to the oil tank through the overflow valve, but the preset pressure is still maintained in the pipeline. In order to completely relieve the load, a unloading mechanism needs to be set to completely unload the oil pressure pipeline. The conventional unloading mechanism is completed by an electromagnetic valve. By opening a bypass with a pilot solenoid valve in series, the electromagnetic valve is used for programmed pressure relief. When the electromagnetic valve relieves pressure on the grease pump, there are usually the following problems: that is, since the solenoid valve core generates heat during operation, the grease around it becomes thinner and easier to flow away. Over time, some solidified substances will remain and stick to the valve core, resulting in incomplete pressure relief of the solenoid valve. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an oil circuit pressure regulating control device for a centralized lubrication oil supply system.

[0005] The technical solution adopted by the present invention is: an oil circuit pressure regulating control device for a centralized lubrication oil supply system, including a pump housing, a power input component, a plunger component, an overflow valve component, a pressure relief valve component and a controller; the pump housing has a cavity for storing lubricating grease, the power input component provides power to pump the grease in the pump cavity into the oil supply pipeline through the plunger component, the overflow valve component and the pressure relief valve component are sequentially arranged on the oil supply pipeline, and an oil pressure sensor is also arranged on the oil supply pipeline, and the signal output end of the oil pressure sensor is connected to the controller;

[0006] The described power input component includes a driving motor, an input shaft, a plunger cam arranged on the input shaft and rotating synchronously with the input shaft, and a pressure relief cam arranged on the input shaft through a one-way bearing. The plunger cam is connected to the valve core of the plunger assembly. When the driving motor rotates forward, the valve core of the plunger assembly is driven through the input shaft and the plunger cam to pump the grease in the pump cavity into the oil supply pipeline. When the pressure in the oil supply pipeline reaches the preset pressure value of the oil pressure sensor, the oil pressure sensor outputs a signal to the controller, and the controller outputs a signal for maintaining pressure in the oil supply pipeline.

[0007] The pressure relief valve assembly includes a pressure relief valve core, a valve core spring sleeved on the pressure relief valve core, a valve body, and a mechanical switch for triggering a signal. The signal of the mechanical switch is output to the controller. The pressure relief valve core is arranged on one side of the pressure relief cam and contacts the pressure relief cam. When the controller gives a reverse rotation instruction to the driving motor, the driving motor drives the pressure relief cam to rotate through the input shaft, and the pressure relief cam drives the pressure relief valve core to move, so that the pressure relief hole on the pressure relief valve core is aligned with the oil return hole on the valve body, and the pressure relief action starts. At the same time, the mechanical switch is turned on and sends a signal of the start of pressure relief to the controller, and the controller starts a rest countdown. During the rest time, the controller controls the plunger assembly to stop pumping oil into the oil supply pipeline. After the rest countdown ends, the controller closes the pressure relief pipeline.

[0008] As a preferred solution, the plunger assembly includes a plunger valve core, a plunger valve body, and a plunger compression spring sleeved on the plunger valve core. An oil suction hole is provided on the plunger valve body. The plunger cam and the plunger compression spring provide power for the reciprocating movement of the plunger valve core, and the grease in the pump cavity enters the valve core through the oil suction hole on the plunger valve body and is then pushed into the oil supply pipeline.

[0009] As a preferred solution, the overflow valve assembly includes an overflow valve body, an overflow valve core, and a pressure regulating mechanism. One end of the pressure regulating mechanism is connected to the overflow valve core. The preset pressure inside the overflow valve assembly is adjusted through the pressure regulating mechanism. An overflow hole is provided on the overflow valve core, and a return ring groove with a return hole is provided inside the overflow valve body.

[0010] As a preferred solution, the pressure regulating mechanism includes a spring seat, a pressure regulating spring, and a pressure regulating screw arranged inside the overflow valve body cavity. One end of the pressure regulating spring is connected to the spring seat, and the other end is connected to the overflow valve core. The preset pressure size is adjusted by turning the pressure regulating screw.

[0011] As a preferred solution, the pressure relief cam is arranged on the input shaft through a one-way bearing, so that when the driving motor rotates forward to drive the plunger cam to act, the driving motor will not drive the pressure relief cam to rotate.

[0012] As a preferred solution, the mechanical switch consists of a conductive sheet disposed in the valve body of the pressure relief valve assembly and a contact corresponding to the conductive sheet. When the pressure relief cam drives the pressure relief valve core to act, the conductive sheet moves synchronously with the pressure relief valve core and conducts with the contact, and the conduction signal is led out to the controller through the terminal.

[0013] As a preferred solution, a valve inner top core is further disposed in the valve body of the pressure relief valve assembly, and the conductive sheet is disposed at the end of the valve inner top core. When the pressure relief cam drives the pressure relief valve core to act, the pressure relief valve core drives the valve inner top core to move, and the conductive sheet moves synchronously and conducts with the contact.

[0014] As a preferred solution, a top core spring is further sleeved on the valve inner top core. When the controller closes the pressure relief pipeline, the valve inner top core automatically resets under the action of the top core spring, and disconnects the conductive sheet from the contact, and the closing signal is led out through the terminal.

[0015] As a preferred solution, a sealing sleeve is further sleeved on the valve inner top core, and one end of the sealing sleeve abuts against one side of the top core spring. When the valve core spring drives the pressure relief valve core to reset, the valve inner top core automatically resets under the action of the top core spring, and the sealing sleeve moves synchronously with the valve inner top core and closes the channel for the oil supply pipeline to drain oil to the pressure relief valve core.

[0016] The beneficial effects of the present invention are as follows:

[0017] Through the innovative structural design, the structural composition of the oil circuit pressure regulating control module of the centralized lubrication oil supply system is optimized in this solution, and an oil circuit pressure regulating control device integrated with a pump housing, a power input component, a plunger component, an overflow valve component, a pressure relief valve component and a controller is realized. This device can automatically control intermittent oil supply according to the signals in the device, and keep the pressure of the entire oil supply pipeline for an effective time according to the signals provided by the oil pressure sensor, so that the lubricating oil in the oil circuit can fully reach the lubrication points in each branch. At the same time, when pressure relief is required, when the controller gives a reverse rotation instruction to the driving motor, the driving motor drives the pressure relief cam to rotate through the input shaft, the pressure relief cam drives the pressure relief valve core to move, so that the pressure relief hole on the pressure relief valve core is aligned with the oil return hole on the valve body, and the pressure relief action starts; at the same time, the mechanical switch is turned on, and a signal indicating the start of pressure relief is sent to the controller, and the controller starts a rest countdown. During the rest time, the controller controls the plunger component to stop pumping oil into the oil supply pipeline. After the rest countdown ends, the controller closes the pressure relief pipeline. To sum up, this solution has the advantages of simplicity, feasibility and good reliability, and can be applied to any conventional plunger pump oil supply system;

[0018] The present invention also has the following technical advantages:

[0019] First, in this solution, a plunger assembly, a relief valve assembly, a pressure relief valve assembly, and an oil pressure sensor are provided in the hydraulic oil circuit. The controller automatically controls the intermittent oil supply to the above components through signals, and based on the signals provided by the oil pressure sensor, maintains the pressure in the entire oil supply pipeline for an effective time. The oil pressure sensor is used to output signals to the controller to better calculate the pressure holding time, so that the lubricating oil in the oil circuit can fully reach the lubrication points in each branch. The controller comprehensively judges and controls the pressure relief time and the rest time, rather than relying solely on the oil pressure sensor, which has the advantage of good reliability.

[0020] Second, in this solution, within the input shaft assembly, it includes a drive motor, an input shaft, a plunger cam that rotates synchronously with the input shaft and is provided on the input shaft, and a pressure relief cam that is provided on the input shaft through a one-way bearing. When the drive motor rotates forward, the plunger cam drives the plunger assembly to act, enabling the continuous pumping of grease into the oil supply pipeline. At this time, the pressure relief cam does not rotate. When pressure relief is required, the controller gives a reverse rotation signal to the drive motor, causing the high stop point of the pressure relief cam to contact the pressure relief valve core and push the valve core to the pressure relief position. This device has the advantage of convenient control.

[0021] Third, in this solution, when the oil supply pipeline experiences overpressure, the grease will automatically push open the relief valve assembly and return to the pump cavity through the oil return hole of the relief valve assembly. Additionally, a pressure regulating mechanism is provided in the relief valve assembly. One end of the pressure regulating mechanism is connected to the relief valve core. By adjusting the pressure regulating mechanism, the preset pressure within the relief valve assembly can be adjusted, which is convenient for matching with the controller and very convenient for adjusting the preset pressure.

[0022] Fourth, in this solution, a mechanical switch composed of a conductive sheet and a contact for triggering signals is provided in the pressure relief valve assembly. The time when this mechanical switch emits a signal is synchronized with the time when the pressure relief valve assembly starts to relieve pressure. At the same time, to better achieve the control process, the conductive sheet is provided at the end of the valve inner core. When the pressure relief cam drives the pressure relief valve core to act, the pressure relief valve core drives the valve inner core to move, causing the conductive sheet to move synchronously and conduct with the contact. A core spring is also sleeved on the valve inner core. When the controller closes the pressure relief pipeline, the valve inner core automatically resets under the action of the core spring, disconnecting the conductive sheet from the contact, and the closing signal is led out through the terminal. Secondly, to better close the pressure relief channel, a sealing sleeve is also sleeved on the valve inner core. One end of the sealing sleeve abuts against one side of the core spring. When the core spring drives the pressure relief valve core to reset, the valve inner core automatically resets under the action of the core spring, and the sealing sleeve moves synchronously with the valve inner core to close the channel for the oil supply pipeline to discharge oil to the pressure relief valve core. The above structure has the advantage of good reliability. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Schematic three-dimensional structure diagram of the present invention;

[0025] Figure 2 Top view of the present invention;

[0026] Figure 3 Structural cross-sectional view of the overflow valve assembly in the present invention.

[0027] Figure 4 Structural cross-sectional view of the plunger assembly in the present invention;

[0028] Figure 5 Structural cross-sectional view of the pressure relief valve assembly in the present invention. Detailed implementation manners

[0029] Next, the present invention will be specifically described through exemplary implementation manners. However, it should be understood that, without further description, the elements, structures, and features in one implementation manner can also be beneficially combined with those in other implementation manners.

[0030] It should be noted that: unless otherwise defined, the technical terms or scientific terms used herein should have the ordinary meaning understood by those of ordinary skill in the field to which the present invention belongs. The words such as "a", "one", or "the" used in the specification and claims of this patent application for the present invention do not express a limitation of quantity, but mean that there is at least one. The words such as "comprising" or "including" point out that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function.

[0031] Next, in combination with the attached Figures 1-5 The detailed structure of this solution will be described:

[0032] Such as Figure 1 And Figure 2As shown, the oil pressure regulating control device of the centralized lubrication oil supply system mainly includes a pump housing 1, a power input component 2, a plunger component 3, a relief valve component 4, a pressure relief valve component 5, an oil pressure sensor 6 and a controller connected thereto; the pump housing 1 has a cavity for storing lubricating grease, and the grease in the portable oil box is pressed into the pump cavity through a guide oil pipe and a pressure oil disc component. The power input component 2 provides power to pump the grease in the pump cavity into the oil supply pipeline 12 through the plunger component 3. The relief valve component 4, the pressure relief valve component 5 and the oil pressure sensor 6 are sequentially arranged on the oil supply pipeline 12, and the signal output end of the oil pressure sensor 6 is connected to the controller;

[0033] The power input component 2 includes a drive motor, an input shaft 21, a plunger cam 22 arranged on the input shaft 21 and rotating synchronously with the input shaft, and a pressure relief cam 23 arranged on the input shaft through a one-way bearing. It should be noted that the drive motor component is not drawn in the attached drawing, and the connection method between the drive motor and the input shaft is a mature structure in the prior art, which will not be described in detail here. The plunger cam 22 is connected to the plunger valve core 31 of the plunger component 3. When the drive motor rotates forward, the power input shaft 21 drives the plunger valve core 31 in the plunger component to reciprocate through its coaxial plunger cam 22. The return power of the plunger valve core 31 is provided by a plunger compression spring 32 sleeved on the valve core. The grease in the pump cavity enters the plunger valve core 31 through the oil suction hole 331 on the plunger valve body 33 and is then pushed into the oil supply pipeline 12. Under the continuous reciprocating movement of the plunger valve core 31, the grease is continuously pumped into the oil supply pipeline 12. When the preset value of the oil pressure sensor 6 is reached, the oil pressure sensor 6 sends a signal to the controller, and the controller performs a pressure holding countdown. The function of pressure holding is to ensure that the grease is fully delivered to each lubrication point in the oil supply pipeline 12. The pressure holding time is set according to the actual situation of the total length of the pipeline;

[0034] During the pressure holding time, if the pressure in the oil supply pipeline 12 exceeds the pressure, that is, the pressure in the oil supply pipeline 12 exceeds the preset pressure value of the relief valve component 4, the grease in the oil supply pipeline 12 will push open the relief valve component 4 and flow back to the pump housing 1 through the oil return hole on the relief valve component 4;

[0035] After the pressure holding countdown is completed, the controller gives a reverse rotation signal to the drive motor, and the input shaft 21 rotates reversely by half a turn. The pressure relief cam 23 fixed on the input shaft 21 pushes the pressure relief valve core 51 of the pressure relief valve component 5 to move during the rotation. At this time, the high stop point of the pressure relief cam 23 on the pressure relief component 5 contacts the pressure relief valve core 51 and pushes the pressure relief valve core 51 to the pressure relief position. At this time, the pressure relief hole 511 on the pressure relief valve body 52 of the pressure relief valve core 51 is aligned with the oil return hole 521 on the pressure relief valve body 52, and the pressure relief action starts. At the same time, the mechanical switch 53 on the pressure relief component is turned on, and a wire led out through the terminal 531 sends a signal of the start of pressure relief to the controller, and the controller starts a rest countdown;

[0036] During the pressure relief process, the grease in the oil supply pipeline 12 sequentially returns to the pump housing 1 through the intermediate pressure relief hole 511 of the pressure relief valve core 51 and the oil return hole 521 of the pressure relief valve body. At this time, the oil supply pipeline 12 is completely pressure-relieved. Even during this process, the plunger assembly 4 pumps oil into the oil supply pipeline 12, but since the pressure relief pipeline is in an open state, the pipeline will not be pressurized. After the rest countdown ends, the controller starts to issue a pump oil command. First, it closes the pressure relief pipeline. Its action is: first, give a signal to the drive motor to reverse half a turn, rotate the input shaft 21 so that the low stop point of the pressure relief cam 23 contacts the pressure relief valve core 51. At this time, the pressure relief hole 511 on the pressure relief valve core is disengaged from the oil return hole 521 of the pressure relief valve body, and the pipeline is closed; after closing the pressure relief pipeline, then give a signal to the motor to rotate forward and continue to pump oil into the oil supply pipeline 12.

[0037] In this embodiment, since the pressure relief cam 23 and the power input shaft 21 are connected by a one-way bearing, this structure enables the drive motor to drive the plunger cam 22 to act during forward rotation without driving the pressure relief cam 23 to rotate.

[0038] As Figure 3 shown, the overflow valve assembly 4 includes an overflow valve body 42, an overflow valve core 41, and a pressure regulating mechanism. One end of the pressure regulating mechanism is connected to the overflow valve core 41. By adjusting the pressure regulating mechanism, the size of the preset pressure inside the overflow valve assembly is adjusted. An overflow hole 411 is provided on the overflow valve core 41, and a return ring groove 421 with a return hole is provided inside the overflow valve body 42. The pressure regulating mechanism includes a spring seat 45, a pressure regulating spring 43, and a pressure regulating screw 44 arranged inside the overflow valve body cavity. One end of the pressure regulating spring 43 is connected to the spring seat 45, and the other end is connected to the overflow valve core 41. The size of the preset pressure is adjusted by turning the pressure regulating screw 43;

[0039] When the oil pressure in the oil supply pipeline 12 exceeds the preset pressure value set by the pressure regulating mechanism, the overflow valve core 41 is pushed outwards, moving in the direction of spring compression against the pressure of the pressure regulating spring 43. The overflow hole 411 on the overflow valve core 41 gradually aligns with the return ring groove 421 on the overflow valve body 42. A return hole is provided on the ring groove 421, and the grease sequentially flows through the overflow valve core 41, the overflow hole 411, the return ring groove 421, and the return hole into the pump housing to complete the return.

[0040] As Figure 4As shown, the oil supply process of the plunger assembly in this solution is a conventional process, and this solution has no optimization. Its specific structure is roughly as follows: The plunger assembly 3 includes a plunger valve core 31, a plunger valve body 33, and a plunger compression spring 32 sleeved on the plunger valve core 31. An oil suction hole 331 is provided on the plunger valve body 33. The plunger cam 22 and the plunger compression spring 32 provide the power for the reciprocating movement of the plunger valve core 31. The grease in the pump chamber enters the valve core through the oil suction hole 331 on the plunger valve body 33 and is then pushed into the oil supply pipeline 12.

[0041] As Figure 5 shown, the pressure relief valve assembly 5 includes a pressure relief valve core 51, a valve core spring 53 sleeved on the pressure relief valve core, a valve body 52, an inner valve core 54, and a mechanical switch for triggering a signal. The mechanical switch is composed of a conductive sheet 57 provided at the end of the inner valve core 54 and a contact 53 corresponding to the conductive sheet. A core spring 55 is also sleeved on the inner valve core 54. When the controller closes the pressure relief pipeline, the inner valve core 54 automatically resets under the action of the core spring 55; when the high stop point of the pressure relief cam 23 contacts the pressure relief valve core 51, the pressure relief oil hole 511 of the valve core coincides with the oil return hole 521 on the valve body. At this time, the pressure relief oil hole 511 is connected to the oil supply pipeline 12 through an oil passage opened inside the pressure relief valve core 51, and the oil circuit starts to relieve pressure. At this time, the conductive sheet 57 conducts the contact 56. The conduction signal is led out through the terminal 531, and the conduction signal is transmitted to the controller;

[0042] When pressure relief is not required, the pressure relief cam 23 rotates half a turn in reverse, and its low stop point contacts the pressure relief valve core 51. Under the action of the valve core spring 53, the valve core spring 53 drives the pressure relief valve core 51 to move leftward to close the pressure relief oil hole 511. At the same time, the inner valve core 54 also closes the channel for the oil supply pipeline 12 to discharge oil to the pressure relief valve core 511 under the action of the core spring 55. At the same time, the conductive sheet 57 disconnects the contact 56 at this time. The closing signal is led out through the terminal 531, and the closing signal is transmitted to the controller.

[0043] In this embodiment, a sealing sleeve 58 is also sleeved on the inner valve core 54. One end of the sealing sleeve 58 abuts against one side of the core spring 55. When the valve core spring drives the pressure relief valve core to reset, the inner valve core automatically resets under the action of the core spring 55. The sealing sleeve 58 moves synchronously with the inner valve core 54 and closes the channel for the oil supply pipeline to discharge oil to the pressure relief valve core.

[0044] In this solution, the control method for regulating the pressure of the entire oil supply pipeline by using the above device is as follows:

[0045] Step 1. During the operation of the centralized lubrication oil supply system, the controller outputs a signal, and the grease in the pump chamber is pumped into the oil supply pipeline through the plunger assembly. When the pressure in the oil supply pipeline is greater than the preset value of the oil pressure sensor, the oil pressure sensor outputs a signal to the controller of the centralized lubrication oil supply system. When the controller receives the signal, it maintains the pressure of the oil supply pipeline for a certain period of time;

[0046] Step 2. During the pressure holding time, if the pressure in the oil supply pipeline exceeds the set pressure threshold of the overflow valve assembly, the oil return hole of the overflow valve opens, and the grease returns to the pump chamber through the overflow valve;

[0047] Step 3. When the controller detects the end of the pressure holding time, it gives a reverse signal to the drive motor. The drive motor operates, and successively drives the spool of the pressure relief valve assembly to act through the input shaft and the pressure relief cam, so that the pressure relief hole on the pressure relief valve spool is aligned with the oil return hole on the valve body, and the pressure relief action starts; At the same time, the mechanical switch on the pressure relief valve assembly is turned on and sends a signal indicating the start of pressure relief to the controller. The controller starts the rest countdown. During the rest time, it controls the plunger assembly to stop pumping oil into the oil supply pipeline. After the rest countdown ends, the controller closes the pressure relief pipeline, and the pressure relief ends;

[0048] Step 4. After closing the pressure relief pipeline, then give a forward rotation signal to the drive motor to continue pumping oil into the oil supply pipeline.

[0049] It should be noted that although the present invention has been described through the above embodiments, the present invention can also have many other embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and deformations to the present invention, but these changes and deformations should all fall within the scope protected by the appended claims of the present invention and their equivalents.

Claims

1. The oil circuit pressure regulating control device of the centralized lubrication oil supply system, characterized in that: It includes a pump housing, a power input assembly, a plunger assembly, a relief valve assembly, a pressure relief valve assembly, and a controller; the pump housing has a cavity for storing lubricating grease, the power input assembly provides power to pump the grease in the pump cavity into the oil supply pipeline through the plunger assembly, the relief valve assembly and the pressure relief valve assembly are sequentially arranged on the oil supply pipeline, and an oil pressure sensor is also provided on the oil supply pipeline, and the signal output end of the oil pressure sensor is connected to the controller; The power input assembly includes a driving motor, an input shaft, a plunger cam arranged on the input shaft and rotating synchronously with the input shaft, and a pressure relief cam arranged on the input shaft through a one-way bearing. The plunger cam is connected to the valve core of the plunger assembly. When the driving motor rotates forward, the valve core of the plunger assembly is driven through the input shaft and the plunger cam to pump the grease in the pump cavity into the oil supply pipeline; when the pressure in the oil supply pipeline reaches the preset pressure value of the oil pressure sensor, the oil pressure sensor outputs a signal to the controller, and the controller outputs a signal for maintaining the pressure of the oil supply pipeline; The pressure relief valve assembly includes a pressure relief valve core, a valve core spring sleeved on the pressure relief valve core, a valve body, and a mechanical switch for triggering a signal. The signal of the mechanical switch is output to the controller. The pressure relief valve core is arranged on one side of the pressure relief cam and contacts the pressure relief cam. When the controller gives a reverse rotation instruction to the driving motor, the driving motor drives the pressure relief cam to rotate through the input shaft, and the pressure relief cam drives the pressure relief valve core to move, so that the pressure relief hole on the pressure relief valve core is aligned with the oil return hole on the valve body, and the pressure relief action starts; at the same time, the mechanical switch is turned on and sends a signal of the start of pressure relief to the controller, and the controller starts a rest countdown. During the rest time, the controller controls the plunger assembly to stop pumping oil into the oil supply pipeline. After the rest countdown ends, the controller closes the pressure relief pipeline; when pressure relief is not required, the pressure relief cam rotates half a turn in reverse, and its low stop point contacts the pressure relief valve core. Under the action of the valve core spring, the valve core spring drives the pressure relief valve core to move leftward to close the pressure relief oil hole. At the same time, the valve inner core closes the channel of the oil supply pipeline to the pressure relief valve core under the action of the inner core spring; the mechanical switch is composed of a conductive sheet arranged in the valve body of the pressure relief valve assembly and a contact corresponding to the conductive sheet. When the pressure relief cam drives the pressure relief valve core to act, the conductive sheet moves synchronously with the pressure relief valve core and conducts with the contact, and the conduction signal is led out to the controller through the terminal; A valve inner core is also provided in the valve body of the pressure relief valve assembly. The conductive sheet is arranged at the end of the valve inner core. When the pressure relief cam drives the pressure relief valve core to act, the pressure relief valve core drives the valve inner core to move, and the conductive sheet moves synchronously and conducts with the contact; a top core spring is also sleeved on the valve inner core. When the controller closes the pressure relief pipeline, the valve inner core automatically resets under the action of the top core spring and disconnects the conductive sheet from the contact, and the closing signal is led out through the terminal; a sealing sleeve is also sleeved on the valve inner core.

2. The oil circuit pressure regulating control device of the centralized lubrication oil supply system according to claim 1, characterized in that: The described plunger assembly includes a plunger valve core, a plunger valve body, and a plunger compression spring sleeved on the plunger valve core. An oil suction hole is provided on the plunger valve body. The plunger cam and the plunger compression spring provide the power for the reciprocating movement of the plunger valve core. The grease in the pump chamber enters the valve core through the oil suction hole on the plunger valve body and is then pushed into the oil supply pipeline.

3. The oil circuit pressure regulating control device of the centralized lubrication oil supply system according to claim 1, characterized in that: The described overflow valve assembly includes an overflow valve body, an overflow valve core, and a pressure regulating mechanism. One end of the pressure regulating mechanism is connected to the overflow valve core. The size of the preset pressure inside the overflow valve assembly is adjusted through the pressure regulating mechanism. An overflow hole is provided on the overflow valve core, and a return ring groove with a return hole is provided inside the overflow valve body.

4. The oil circuit pressure regulating control device of the centralized lubrication oil supply system according to claim 3, characterized in that: The described pressure regulating mechanism includes a spring seat, a pressure regulating spring, and a pressure regulating screw arranged inside the overflow valve body cavity. One end of the pressure regulating spring is connected to the spring seat, and the other end is connected to the overflow valve core. The size of the preset pressure is adjusted by turning the pressure regulating screw.

5. The oil circuit pressure regulating control device of the centralized lubrication oil supply system according to claim 1, wherein: The pressure relief cam is arranged on the input shaft through a one-way bearing, so that when the driving motor rotates forward to drive the plunger cam to act, the driving motor does not drive the pressure relief cam to rotate.

6. The oil circuit pressure regulating control device of the centralized lubrication oil supply system according to claim 1, characterized in that: One end of the sealing sleeve abuts against one side surface of the core spring. When the valve core spring drives the pressure relief valve core to reset, the inner core of the valve automatically resets under the action of the core spring. The sealing sleeve moves synchronously with the inner core of the valve and closes the channel for the oil supply pipeline to discharge oil to the pressure relief valve core.

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