Lubricating pump and control method thereof

Abstract

The invention discloses a lubricating pump and a control method thereof. The lubricating pump comprises a plunger pump component, an electric control board component, a plunger driving component and an oil storage barrel. The plunger pump component comprises a pump body, a plunger and an oil outlet one-way valve, a plunger hole, an oil suction hole, an oil discharge hole and an oil outlet hole are formed in the pump body, one end of the oil suction hole is connected with the inner wall of the plunger hole, the other end of the oil suction hole is connected with the oil storage barrel, and the oil inlet side and the oil outlet side of the oil outlet one-way valve are connected with the plunger hole and the oil outlet hole respectively. The two ends of the oil discharge hole are connected with the plunger hole and the oil outlet hole respectively, and the oil suction hole is located between the oil discharge hole and the oil outlet one-way valve. The electric control plate component is electrically connected with the plunger driving component, and the plunger driving component is connected with the plunger, so that the electric control plate component controls the plunger driving component to drive the plunger to axially reciprocate along the plunger hole. The oil pump is large in oil outlet amount, and has the advantages of simple structure, reliable work, compact layout and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of lubrication pumps, and in particular to a lubrication pump and a control method thereof. Background Art

[0002] Currently, centralized lubrication systems for quantitative metering devices utilize grease pumps with pressure relief functions. These pumps typically utilize a motor driving an eccentric through a reduction gearbox, which propels a plunger in reciprocating motion to supply oil. A solenoid valve is also included to relieve the pump's pressure. This structure has two main drawbacks: 1. The pump's oil output is relatively low; 2. A solenoid pressure relief valve is required to provide this relief.

[0003] There are three ways to increase oil pump output when designing an oil pump: a. Increase the effective plunger stroke; b. Increase the plunger cross-sectional area; c. Increase the frequency of plunger actuation. While maintaining the same output pressure, increasing the plunger stroke means increasing the eccentricity of the eccentric. Increasing the eccentricity requires increasing the required motor drive torque, and increasing the plunger cross-sectional area also requires increasing the motor drive torque. Due to limitations in installation space, cost control, and aesthetic requirements for product appearance, the motor's overall dimensions should not be too large, and a higher power motor cannot be selected to achieve higher drive torque. Furthermore, an excessively high plunger actuation frequency impairs the pump's suction capacity, resulting in a generally low oil output for this type of pump.

[0004] The oil pump pressure relief function is completed by additionally providing an electromagnetic pressure relief valve, which increases the production cost of the product and increases the failure points. The product structure cannot be designed to be more compact. Summary of the Invention

[0005] The object of the present invention is to provide a lubrication pump and a control method thereof, which not only has a large oil output but also has the advantages of simple structure, reliable operation and compact layout.

[0006] To achieve the above object, the present invention provides the following technical solution: a lubrication pump, comprising a plunger pump component, an electric control board component, a plunger drive component and an oil storage cylinder; The plunger pump component includes a pump body, a plunger, and an oil outlet one-way valve. The pump body is provided with a plunger hole, an oil suction hole, an oil discharge hole, and an oil outlet hole. One end of the oil suction hole is connected to the inner wall of the plunger hole, and the other end of the oil suction hole is connected to the oil storage cylinder. The oil inlet side and the oil outlet side of the oil outlet one-way valve are respectively connected to the plunger hole and the oil outlet hole. The two ends of the oil discharge hole are respectively connected to the plunger hole and the oil outlet hole, and the oil suction hole is located between the oil discharge hole and the oil outlet one-way valve. The electric control board component is electrically connected to the plunger driving component, and the plunger driving component is connected to the plunger, so that the electric control board component controls the plunger driving component to drive the plunger to move back and forth axially along the plunger hole.

[0007] By adopting the above technical solution, the electronic control panel components control the plunger drive components to drive the plunger to move back and forth within the set range, completing the oil pump's oil suction, oil discharge, and pressure relief functions. The plunger movement stroke does not affect the required output torque of the plunger drive components, so a large oil discharge stroke can be designed, the oil pump has a large oil output, and there is no need to set up an additional electromagnetic pressure relief valve. Compared with traditional designs, the structure is simple, the operation is reliable, and the layout is compact.

[0008] The present invention is further configured such that the electric control panel component includes a control panel and a position monitoring switch AS, a position monitoring switch BS, and a position monitoring switch CS electrically connected to the control panel; a plunger identification point is fixedly connected to the plunger or the plunger driving component; and the plunger has a plunger position A at the push-out limit point, a plunger position B at the position of returning and opening the oil suction hole, and a plunger position C at the position of returning and opening the oil unloading hole during the displacement process; the position monitoring switch AS, the position monitoring switch BS, and the position monitoring switch CS detect the plunger position identification point and send a signal to the control panel when the plunger reaches plunger position A, plunger position B, and plunger position C, respectively.

[0009] By adopting the above technical solution, the control panel controls the plunger drive component to cause the plunger to continuously and alternately reciprocate between plunger position A and plunger position B, completing the continuous oil discharge of the oil pump. The control panel controls the plunger drive component to return the plunger to plunger position C, connecting the oil unloading hole with the oil suction hole, and then connecting to the oil outlet hole, allowing the pressure in the oil outlet pipeline to be released through the oil unloading hole and the oil suction hole, completing the oil pump pressure relief. In this way, by monitoring the plunger position signal, the plunger movement direction and movement range are controlled, completing the oil pump's oil suction, oil discharge, and pressure relief functions.

[0010] The present invention is further configured such that the plunger driving component includes a motor, a reduction gearbox, a screw and a screw sleeve, the input end of the reduction gearbox is linked to the motor shaft of the motor, the screw sleeve is threadedly matched with the screw, the screw and the plunger are coaxially arranged, and the output end of the reduction gearbox is transmission-connected to the plunger through the matching structure of the screw and the screw sleeve, for driving the plunger to move axially.

[0011] By adopting this technical solution, the motor drives the plunger along the plunger hole through the reduction gearbox and the drive structure of the screw sleeve and screw. Changing the motor's rotation direction changes the drive direction of the screw sleeve and screw, which in turn changes the direction of the plunger's movement. The electronic control panel switches the motor's rotation direction based on the plunger's position, thus controlling the plunger's reciprocating movement within the corresponding range, meeting the plunger drive requirements. The screw sleeve and plunger should be designed coaxially to avoid non-coaxial designs that generate bending moments and increase motor load.

[0012] The present invention is further configured such that the screw is connected to the output end of the reduction gearbox, the sleeve is connected to the plunger, and the sleeve is circumferentially limited by a limiting mechanism so that when the screw rotates, the sleeve drives the plunger to move axially.

[0013] By adopting the above technical solution, which is the first setting mode of the screw and sleeve transmission structure, the reduction box drives the screw to rotate, and the sleeve moves linearly under the action of the limiting mechanism and drives the plunger to move back and forth.

[0014] The present invention is further configured such that the screw is connected to the plunger, the sleeve is connected to the output end of the reduction gearbox, and the sleeve is axially limited so that when the sleeve rotates, the screw drives the plunger to move axially.

[0015] By adopting the above technical solution, which is a second setting mode of the screw and sleeve transmission structure, the reduction box drives the sleeve to rotate, the screw to move linearly, and drives the plunger to move back and forth. The screw cantilever length is shortened and the screw rigidity is improved.

[0016] The present invention is further configured such that the motor and the screw are respectively arranged on both sides of the reduction box or are both arranged on the same side of the reduction box.

[0017] By adopting the above technical solution, the motor and the screw are arranged on opposite sides, that is, the input shaft and the output shaft of the reduction gearbox are arranged on opposite sides. In this arrangement, there are no other components on the motor installation side, the reduction gearbox structure is more compact, and the motor installation and maintenance are convenient; the motor and the screw are arranged on the same side, that is, the input shaft and the output shaft of the reduction gearbox are arranged on the same side, which can reduce the external dimensions of the oil pump in the direction of plunger movement.

[0018] The present invention is further configured such that the position monitoring switch AS, the position monitoring switch BS and the position monitoring switch CS are independently provided and connected to the control board via signal lines.

[0019] By adopting the above technical solution, the control panel is flexible in design and is not limited by the positioning positions of the monitoring switches AS, BS, and CS.

[0020] The present invention is further configured such that the motor is a stepper motor or a servo motor.

[0021] By adopting the above technical solution, the position monitoring switch AS, the position monitoring switch BS and the position monitoring switch CS can be eliminated, and the control board directly positions the plunger through a stepper motor or a servo motor to complete the oil pump function.

[0022] The present invention is further configured such that the plunger drive component may also be driven by an air cylinder or an oil cylinder.

[0023] By adopting the above technical solution, the plunger can be driven to work by air pressure or oil pressure.

[0024] The present invention is further configured to further include a pressure regulating valve, which is communicated with the oil outlet of the pump body.

[0025] By adopting the above technical solution, when the oil pump outlet pressure regulating valve sets the pressure, the overpressure grease overflows back to the oil storage cylinder through the pressure regulating valve to prevent the oil pump motor from overloading; the pressure regulating valve can adjust the maximum oil pump outlet pressure.

[0026] The present invention is further configured such that a pressure relief oil return hole is provided on the pump body, one end of the pressure relief oil return hole is connected to the inner wall of the plunger hole, the other end of the pressure relief oil return hole is connected to the oil storage cylinder, and an annular groove is provided on the outer surface of the plunger, and the annular groove connects the oil relief hole and the pressure relief oil return hole.

[0027] By adopting the above technical solution, when the oil pump is unloading pressure, the plunger moves to connect the oil unloading hole with the pressure relief oil return hole, thereby completing the oil pump pressure relief function.

[0028] A first method for controlling a lubrication pump provided by the present invention comprises the following steps: S1. Turn on the oil pump power manually or through PLC control to energize the oil pump; S2, the control panel checks the position monitoring switch CS signal to determine whether the plunger is in plunger position C. If the plunger is detected to be in plunger position C, the low oil level signal check is started; if the plunger is not detected to be in plunger position C, the motor is controlled to return the plunger to plunger position C; S3. The control panel checks the low oil level signal. If there is no low oil level alarm signal, the oil pump starts running. If there is a low oil level alarm signal, the motor is controlled to return the plunger to plunger position C, the motor stops, and a low oil level alarm signal is output to the PLC, which reminds the user to add grease. S4: The oil pump starts to supply oil, and the motor drives the plunger to move back and forth between plunger position A and plunger position B, so that the oil pump can continuously discharge oil. S5. The control panel checks the low oil level signal. If there is no low oil level alarm signal, the oil pump continues to run. If there is a low oil level alarm signal, the control motor returns the plunger to plunger position C, the oil pump stops, and outputs a low oil level alarm signal to the PLC, which reminds the user to refill grease. S6: When the oil pump is running, the control board monitors the motor operating current. If the motor current reaches the set rated current, the motor is controlled to return the plunger to the plunger position C, the motor stops, and the oil pump normal stop signal is output; if the motor current does not reach the set rated current, after the set maximum operating time is reached, the motor is controlled to return the plunger to the plunger position C, the motor stops, and no oil pump normal stop signal is output; S7. Within the set operating time, the PLC detects the normal oil pump shutdown signal output by the control board, and the PLC cuts off the power supply to the oil pump. After the set waiting time, it reconnects the power supply to the oil pump and controls the oil pump to work again. If the PLC does not receive the normal oil pump shutdown signal within the set operating time, the PLC cuts off the power supply to the oil pump and outputs an oil pump fault signal to remind the user to check the oil pump.

[0029] The second lubrication pump control method provided by the present invention comprises the following steps: The following steps are also included: S1. Turn on the oil pump power manually or through PLC control to energize the oil pump; S2, the control panel checks the position monitoring switch CS signal to determine whether the plunger is in plunger position C; if the plunger is detected to be in plunger position C, it enters the low oil level signal check; if the plunger is not detected to be in plunger position C, it controls the motor to return the plunger to plunger position C; S3. The control panel checks the low oil level signal. If there is no low oil level alarm signal, the oil pump starts running. If there is a low oil level alarm signal, the motor is controlled to return the plunger to plunger position C, the motor stops, and a low oil level alarm signal is output to the PLC, which reminds the user to add grease. S4: The oil pump starts to supply oil, and the motor drives the plunger to move back and forth between plunger position A and plunger position B, so that the oil pump can continuously discharge oil. S5. The control panel checks the low oil level signal. If there is no low oil level alarm signal, the oil pump continues to run. If there is a low oil level alarm signal, the control motor returns the plunger to plunger position C, the oil pump stops, and outputs a low oil level alarm signal to the PLC, which reminds the user to refill grease. S6: When the oil pump is running and supplying oil, the control panel monitors the pressure switch signal of the oil outlet pipeline. If the pressure switch action signal is received, the control motor is controlled to return the plunger to the plunger position C, the motor stops, and the oil pump normal stop signal is output. If no pressure switch signal is received and the set maximum operating time is reached, the control motor is controlled to return the plunger to the plunger position C, the motor stops, and no oil pump normal stop signal is output. S7. During the oil pump power supply time, the PLC detects the oil pump normal shutdown signal output by the control board and confirms that the oil pump is working normally. The PLC cuts off the oil pump power supply and waits to be powered on again to control the oil pump to work again. If the PLC does not receive the oil pump normal shutdown signal during the oil pump power supply time, the PLC cuts off the oil pump power supply and outputs an oil pump fault signal to remind the user to check the oil pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural schematic diagram of an embodiment of a lubrication pump of the present invention; Figure 2 This is a schematic structural diagram of the present invention when the plunger is located at plunger position A; Figure 3 This is a schematic structural diagram of the present invention when the plunger is located at plunger position B; Figure 4 This is a schematic structural diagram of the present invention when the plunger is located at plunger position C; Figure 5 It is a structural schematic diagram of a first embodiment of the plunger driving component of the present invention; Figure 6 Schematic diagram of the structure of the second embodiment of the plunger drive component of the present invention; Figure 7 Schematic diagram of the structure of the third embodiment of the plunger drive component of the present invention; Figure 8 Schematic diagram of the structure of the fourth embodiment of the plunger drive component of the present invention; Figure 9 This is a structural diagram of the second embodiment of the lubrication pump pressure relief structure of the present invention. Figure 10 This is the first working logic diagram of the present invention; Figure 11 This is the second working logic diagram of the present invention.

[0031] In the figure: 1. Plunger pump components; 11. Pump body; 12. Plunger; 13. Oil outlet check valve; 14. Plunger hole; 15. Oil suction hole; 16. Oil unloading hole; 17. Oil outlet hole; 18. Plunger position identification point; 19. Pressure regulating valve; 110. Pressure relief oil return hole; 111. Annular groove; 2. Electric control board components; 21. Control board; 22. Position monitoring switch AS; 23. Position monitoring switch BS; 24. Position monitoring switch CS; 3. Plunger drive components; 31. Motor; 32. Reducer; 33. Screw; 34. Screw sleeve; 4. Oil storage cylinder. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Example: As shown in the attached Figures 1 to 9 The lubrication pump shown includes a plunger pump component 1, an electric control board component 2, a plunger drive component 3 and an oil storage cylinder 4; The plunger pump component 1 includes a pump body 11, a plunger 12 and an oil outlet one-way valve 13. The pump body 11 is provided with a plunger hole 14, an oil suction hole 15, an oil discharge hole 16 and an oil outlet hole 17. One end of the oil suction hole 15 is connected to the inner wall of the plunger hole 14, and the other end of the oil suction hole 15 is connected to the oil reservoir 4. The oil inlet side and the oil outlet side of the oil outlet one-way valve 13 are respectively connected to the plunger hole 14 and the oil outlet hole 17. The two ends of the oil discharge hole 16 are respectively connected to the plunger hole 14 and the oil outlet hole 17, and the oil suction hole 15 is located between the oil discharge hole 16 and the oil outlet one-way valve 13. The electric control panel component 2 includes a control panel 21 and a position monitoring switch AS22, a position monitoring switch BS23, and a position monitoring switch CS24 electrically connected to the control panel 21. A plunger identification point 18 is fixedly connected to the plunger 12 or the plunger driving component 3. The plunger position identification point 18 moves with the plunger 12. The position monitoring switches AS22, BS23, and CS24 send signals by identifying the plunger identification point 18. During the displacement process, the plunger 12 has a plunger position A at the push-out limit point, a plunger position B at the position of returning to and opening the oil suction hole 15, and a plunger position C at the position of returning to and opening the oil unloading hole 16. The position monitoring switches AS22, BS23, and CS24 detect the plunger position identification point 18 when the plunger 12 reaches plunger position A, plunger position B, and plunger position C, respectively, and send signals to the control panel 21. The control board 21 receives signals from the position monitoring switch AS22, the position monitoring switch BS23, and the position monitoring switch CS24, and the control board 21 is electrically connected to the plunger driving component 3, and the plunger driving component 3 is connected to the plunger 12, so that the electric control board component 2 controls the plunger driving component 3 to drive the plunger 12 to move axially back and forth along the plunger hole 14.

[0034] Single oil suction of the oil pump: the plunger driving component 3 drives the plunger 12 to move from the plunger position A to the plunger position B, completing the single oil suction of the oil pump.

[0035] Single oil discharge of the oil pump: the plunger driving component 3 pushes the plunger 12 to move from the plunger position B to the plunger position A, completing a single oil discharge of the oil pump.

[0036] The oil pump continuously discharges oil: the control board 21 controls the plunger driving component 3 to make the plunger 12 continuously and alternately reciprocate between the plunger position A and the plunger position B, thereby completing the continuous oil discharge of the oil pump.

[0037] Oil pump pressure relief: The control panel 21 controls the plunger drive component 3 to return the plunger 12 to the plunger position C, and the oil unloading hole 16 is connected with the oil suction hole 15, and then connected with the oil outlet hole 17, so that the pressure of the oil outlet pipeline is released through the oil unloading hole 16 and the oil suction hole 15, completing the oil pump pressure relief.

[0038] The system uses an electronic control panel 2 to control the reciprocating motion of the plunger 12 by the plunger drive 3. By monitoring the plunger position signal, the system controls the direction and range of movement of the plunger 12, completing the pump's oil suction, discharge, and pressure relief functions. The plunger 12's travel does not affect the required output torque of the motor 31, allowing for a long discharge stroke and high oil output. Furthermore, there's no need for a separate electromagnetic pressure relief valve. Compared to traditional designs, the system offers a simpler structure, more reliable operation, and a more compact layout.

[0039] As attached Figures 5 to 8As shown, the plunger drive component 3 includes a motor 31, a reduction gearbox 32, a screw 33 and a screw sleeve 34. The input end of the reduction gearbox 32 is linked to the motor shaft of the motor 31, and the screw sleeve 34 is threadedly matched with the screw 33. The plunger identification point 18 can be set on the positioning block of the screw sleeve 34 (or can be set on the plunger 12 or the screw sleeve 34). The screw 33 is coaxially arranged with the plunger 12. The output end of the reduction gearbox 32 is transmission-connected to the plunger 12 through the matching structure of the screw 33 and the screw sleeve 34, and is used to drive the plunger 12 to move axially. Motor 31 drives plunger 12 in a linear motion along plunger hole 14 via a transmission structure including reduction gearbox 32, screw sleeve 34, and screw 33. Changing the rotational direction of motor 31 changes the transmission direction of screw sleeve 34 and screw 33, thereby changing the direction of movement of plunger 12. Electronic control board 2 switches the rotational direction of motor 31 based on the plunger's position, controlling the reciprocating movement of plunger 12 within the corresponding range to meet the drive requirements of plunger 12. The screw sleeve 34 and plunger 12 are designed to be coaxial, avoiding non-coaxial designs that would generate bending moments and increase the load on motor 31.

[0040] The transmission structure of the screw 33 and the screw sleeve 34 has the following two modes: (1) The screw 33 is connected to the output end of the reduction gearbox 32, and the screw sleeve 34 is connected to the plunger 12. The screw sleeve 34 is circumferentially limited by a limiting mechanism, so that when the screw 33 rotates, the screw sleeve 34 drives the plunger 12 to move axially. The reduction gearbox 32 drives the screw 33 to rotate, and the screw sleeve 34, under the action of the limiting mechanism, performs linear motion and drives the plunger 12 to reciprocate.

[0041] (2) The screw 33 is connected to the plunger 12, and the screw sleeve 34 is connected to the output end of the reduction gearbox 32. The screw sleeve 34 is axially limited so that when the screw sleeve 34 rotates, the screw 33 drives the plunger 12 to move axially. The reduction gearbox 32 drives the screw sleeve 34 to rotate, the screw 33 to move linearly, and drives the plunger 12 to reciprocate. The shortened cantilever length of the screw 33 improves the rigidity of the screw 33.

[0042] Among them, the limiting mechanism is a structure that limits circumferentially but allows axial movement. For example, a guide hole is set on the screw sleeve 34. By setting a relatively fixed guide rod, the guide rod passes through the guide hole of the screw sleeve 34, and the axial movement of the screw sleeve 34 can be achieved when the screw 33 rotates.

[0043] As attached Figures 5 to 8As shown, the motor 31 and screw 33 are respectively arranged on both sides of the reduction gearbox 32 or both are arranged on the same side of the reduction gearbox 32. The motor 31 and screw 33 are arranged on opposite sides, that is, the input shaft and output shaft of the reduction gearbox 32 are arranged on opposite sides. This arrangement eliminates the need for other components on the side where the motor 31 is installed, making the reduction gearbox 32 more compact and easier to install and maintain. The motor 31 and screw 33 are arranged on the same side, that is, the input shaft and output shaft of the reduction gearbox 32 are arranged on the same side, which can reduce the overall dimensions of the oil pump in the direction of movement of the plunger 12.

[0044] The position monitoring switches AS22, BS23 and CS24 can be independently provided and connected to the control board 21 via signal lines. The control board 21 is flexible in design and is not limited to the positioning positions of the monitoring switches AS, BS and CS.

[0045] Furthermore, the motor 31 is a stepper motor or a servo motor. The position monitoring switches AS22, BS23 and CS24 can be eliminated, and the control board 21 directly positions the plunger via the stepper motor or servo motor to complete the oil pump function.

[0046] Preferably, the plunger driving component 3 can also be driven by an air cylinder or an oil cylinder, and the plunger 12 is driven by air pressure or oil pressure.

[0047] As attached Figure 5 As shown, the lubrication pump also includes a pressure regulating valve 19, which is connected to the oil outlet 17 of the pump body 11. When the oil pump outlet pressure exceeds the set pressure of the pressure regulating valve 19, the overpressure grease overflows through the pressure regulating valve 19 back into the oil reservoir 4, preventing the oil pump motor 31 from overloading. The pressure regulating valve 19 can adjust the maximum oil pump outlet pressure.

[0048] As attached Figure 9 As shown, the pump body 11 is provided with a pressure relief oil return hole 110, one end of which is connected to the inner wall of the plunger hole 14, and the other end of which is connected to the oil reservoir 4. The outer surface of the plunger 12 is provided with an annular groove 111, which connects the oil relief hole 16 and the pressure relief oil return hole 110. When the oil pump relieves pressure, the plunger 12 moves to connect the oil relief hole 16 with the pressure relief oil return hole 110, completing the oil pump pressure relief function.

[0049] The control panel 21 monitors the working current of the motor 31 and the low oil level signal of the oil reservoir 4 and outputs a low oil level alarm signal and a normal oil pump shutdown signal.

[0050] Among them, the control board 21 monitors the working current of the motor 31. When the working current of the motor 31 reaches the working overload current setting value, the motor 31 is controlled to stop working to prevent the motor 31 from being overloaded and the oil pump from being damaged; when the working current of the motor 31 reaches the working rated pressure current setting value, the motor 31 is controlled to switch direction to complete the oil pump pressure relief function.

[0051] In addition, a pressure switch can be set in the oil pump outlet pipeline. The pressure switch is electrically connected to the control board 21. The control board 21 receives the pressure switch signal. When the oil pump outlet pressure activates the pressure switch, the control board 21 receives the pressure switch action signal and controls the motor 31 to switch direction, thereby completing the oil pump pressure relief function.

[0052] As attached Figure 10 and attached Figure 11 As shown, the first lubrication pump control method provided by the present invention includes the following steps: S1. Turn on the oil pump power manually or through PLC control to energize the oil pump; S2, the control panel checks the position monitoring switch CS signal to determine whether the plunger is in plunger position C (i.e., the initial position). If the plunger is detected to be in plunger position C, the low oil level signal check is started; if the plunger is not detected to be in plunger position C, the motor is controlled to return the plunger to plunger position C; S3. The control panel checks the low oil level signal. If there is no low oil level alarm signal, the oil pump starts running. If there is a low oil level alarm signal, the motor is controlled to return the plunger to plunger position C, the motor stops, and a low oil level alarm signal is output to the PLC, which reminds the user to add grease. S4: The oil pump starts to supply oil, and the motor drives the plunger to move back and forth between plunger position A and plunger position B, so that the oil pump can continuously discharge oil. S5. The control panel checks the low oil level signal. If there is no low oil level alarm signal, the oil pump continues to run. If there is a low oil level alarm signal, the control motor returns the plunger to plunger position C, the oil pump stops, and outputs a low oil level alarm signal to the PLC, which reminds the user to refill grease. S6: When the oil pump is running, the control board monitors the motor operating current. If the motor current reaches the set rated current, the motor is controlled to return the plunger to the plunger position C, the motor stops, and the oil pump normal stop signal is output; if the motor current does not reach the set rated current, after the set maximum operating time is reached, the motor is controlled to return the plunger to the plunger position C, the motor stops, and no oil pump normal stop signal is output; S7. Within the set operating time, the PLC detects the normal oil pump shutdown signal output by the control board, and the PLC cuts off the power supply to the oil pump. After the set waiting time, it reconnects the power supply to the oil pump and controls the oil pump to work again. If the PLC does not receive the normal oil pump shutdown signal within the set operating time, the PLC cuts off the power supply to the oil pump and outputs an oil pump fault signal to remind the user to check the oil pump.

[0053] The second lubrication pump control method provided by the present invention comprises the following steps: S1. Turn on the oil pump power manually or through PLC control to energize the oil pump; S2, the control panel checks the position monitoring switch CS signal to determine whether the plunger is in plunger position C (i.e., the initial position); if the plunger is detected to be in plunger position C, the low oil level signal check is started; if the plunger is not detected to be in plunger position C, the motor is controlled to return the plunger to plunger position C; S3. The control panel checks the low oil level signal. If there is no low oil level alarm signal, the oil pump starts running. If there is a low oil level alarm signal, the motor is controlled to return the plunger to plunger position C, the motor stops, and a low oil level alarm signal is output to the PLC, which reminds the user to add grease. S4: The oil pump starts to supply oil, and the motor drives the plunger to move back and forth between plunger position A and plunger position B, so that the oil pump can continuously discharge oil. S5. The control panel checks the low oil level signal. If there is no low oil level alarm signal, the oil pump continues to run. If there is a low oil level alarm signal, the control motor returns the plunger to plunger position C, the oil pump stops, and outputs a low oil level alarm signal to the PLC, which reminds the user to refill grease. S6: When the oil pump is running and supplying oil, the control panel monitors the pressure switch signal of the oil outlet pipeline. If the pressure switch action signal is received, the control motor is controlled to return the plunger to the plunger position C, the motor stops, and the oil pump normal stop signal is output. If no pressure switch signal is received and the set maximum operating time is reached, the control motor is controlled to return the plunger to the plunger position C, the motor stops, and no oil pump normal stop signal is output. S7. During the oil pump power supply time, the PLC detects the oil pump normal shutdown signal output by the control board and confirms that the oil pump is working normally. The PLC cuts off the oil pump power supply and waits to be powered on again to control the oil pump to work again. If the PLC does not receive the oil pump normal shutdown signal during the oil pump power supply time, the PLC cuts off the oil pump power supply and outputs an oil pump fault signal to remind the user to check the oil pump.

Claims

1. Lubrication pump, characterized by: It comprises a plunger pump component (1), an electric control panel component (2), a plunger drive component (3) and an oil storage cylinder (4); The plunger pump component (1) comprises a pump body (11), a plunger (12) and an oil outlet one-way valve (13); the pump body (11) is provided with a plunger hole (14), an oil suction hole (15), an oil discharge hole (16) and an oil outlet hole (17); one end of the oil suction hole (15) is connected to the inner wall of the plunger hole (14); the other end of the oil suction hole (15) is connected to the oil storage cylinder (4); the oil inlet side and the oil outlet side of the oil outlet one-way valve (13) are respectively connected to the plunger hole (14) and the oil outlet hole (17); the two ends of the oil discharge hole (16) are respectively connected to the plunger hole (14) and the oil outlet hole (17); and the oil suction hole (15) is located between the oil discharge hole (16) and the oil outlet one-way valve (13); The electric control board component (2) is electrically connected to the plunger drive component (3), and the plunger drive component (3) is connected to the plunger (12), so that the electric control board component (2) controls the plunger drive component (3) to drive the plunger (12) to move axially back and forth along the plunger hole (14).

2. The lubrication pump according to claim 1, characterized in that: The electric control panel component (2) includes a control panel (21) and a position monitoring switch AS (22), a position monitoring switch BS (23), and a position monitoring switch CS (24) electrically connected to the control panel (21). A plunger identification point (18) is fixedly connected to the plunger (12) or the plunger driving component (3). During the displacement process, the plunger (12) has a plunger position A at a push-out limit point, a plunger position B at a position returning to open the oil suction hole (15), and a plunger position C at a position returning to open the oil discharge hole (16). The position monitoring switch AS (22), the position monitoring switch BS (23), and the position monitoring switch CS (24) detect the plunger position identification point (18) when the plunger (12) reaches the plunger position A, the plunger position B, and the plunger position C, respectively, and send a signal to the control panel (21).

3. The lubrication pump according to claim 1, characterized in that: The plunger driving component (3) comprises a motor (31), a reduction box (32), a screw (33) and a screw sleeve (34); the input end of the reduction box (32) is linked to the motor shaft of the motor (31); the screw sleeve (34) is threadedly matched with the screw (33); the screw (33) and the plunger (12) are coaxially arranged; the output end of the reduction box (32) is transmission-connected to the plunger (12) through the matching structure of the screw (33) and the screw sleeve (34) for driving the plunger (12) to move axially.

4. The lubrication pump according to claim 3, characterized in that: The screw (33) is connected to the output end of the reduction box (32), and the screw sleeve (34) is connected to the plunger (12). The screw sleeve (34) is circumferentially limited by a limiting mechanism, so that when the screw (33) rotates, the screw sleeve (34) drives the plunger (12) to move axially.

5. The lubrication pump according to claim 3, characterized in that: The screw (33) is connected to the plunger (12), and the screw sleeve (34) is connected to the output end of the reduction box (32). The screw sleeve (34) is axially limited so that when the screw sleeve (34) rotates, the screw (33) drives the plunger (12) to move axially.

6. The lubrication pump according to claim 3, characterized in that: The motor (31) and the screw (33) are respectively arranged on both sides of the reduction box (32) or are both arranged on the same side of the reduction box (32).

7. The lubrication pump according to claim 1, characterized in that: It also includes a pressure regulating valve (19), which is connected to the oil outlet hole (17) of the pump body (11).

8. The lubrication pump according to claim 1, characterized in that: The pump body (11) is provided with a pressure relief oil return hole (110), one end of the pressure relief oil return hole (110) is connected to the inner wall of the plunger hole (14), and the other end of the pressure relief oil return hole (110) is communicated with the oil storage cylinder (4). The outer surface of the plunger (12) is provided with an annular groove (111), and the annular groove (111) communicates with the oil relief hole (16) and the pressure relief oil return hole (110).

9. The control method of a lubrication pump according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Turn on the oil pump power manually or through PLC control to energize the oil pump; S2, the control panel checks the position monitoring switch CS signal to determine whether the plunger is in plunger position C; if the plunger is detected to be in plunger position C, it enters the low oil level signal check; if the plunger is not detected to be in plunger position C, it controls the motor to return the plunger to plunger position C; S3. The control panel checks the low oil level signal. If there is no low oil level alarm signal, the oil pump starts running. If there is a low oil level alarm signal, the motor is controlled to return the plunger to plunger position C, the motor stops, and a low oil level alarm signal is output to the PLC, which reminds the user to add grease. S4: The oil pump starts to supply oil, and the motor drives the plunger to move back and forth between plunger position A and plunger position B, so that the oil pump can continuously discharge oil. S5. The control panel checks the low oil level signal. If there is no low oil level alarm signal, the oil pump continues to run. If there is a low oil level alarm signal, the control motor returns the plunger to plunger position C, the oil pump stops, and outputs a low oil level alarm signal to the PLC, which reminds the user to refill grease. S6: When the oil pump is running, the control board monitors the motor operating current. If the motor current reaches the set rated current, the motor is controlled to return the plunger to the plunger position C, the motor stops, and the oil pump normal shutdown signal is output; If the motor current has not reached the set rated current, after reaching the set maximum working time, the motor is controlled to return the plunger to the plunger position C, the motor stops, and the oil pump normal shutdown signal is not output; S7. Within the set operating time, the PLC detects the normal oil pump shutdown signal output by the control board, and the PLC cuts off the power supply to the oil pump. After the set waiting time, it reconnects the power supply to the oil pump and controls the oil pump to work again. If the PLC does not receive the normal oil pump shutdown signal within the set operating time, the PLC cuts off the power supply to the oil pump and outputs an oil pump fault signal to remind the user to check the oil pump.

10. The control method of a lubrication pump according to any one of claims 1 to 8, characterized in that: The following steps are also included: S1. Turn on the oil pump power manually or through PLC control to energize the oil pump; S2, the control panel checks the position monitoring switch CS signal to determine whether the plunger is in plunger position C; if the plunger is detected to be in plunger position C, it enters the low oil level signal check; if the plunger is not detected to be in plunger position C, it controls the motor to return the plunger to plunger position C; S3. The control panel checks the low oil level signal. If there is no low oil level alarm signal, the oil pump starts running. If there is a low oil level alarm signal, the motor is controlled to return the plunger to plunger position C, the motor stops, and a low oil level alarm signal is output to the PLC, which reminds the user to add grease. S4: The oil pump starts to supply oil, and the motor drives the plunger to move back and forth between plunger position A and plunger position B, so that the oil pump can continuously discharge oil. S5. The control panel checks the low oil level signal. If there is no low oil level alarm signal, the oil pump continues to run. If there is a low oil level alarm signal, the control motor returns the plunger to plunger position C, the oil pump stops, and outputs a low oil level alarm signal to the PLC, which reminds the user to refill grease. S6: When the oil pump is running and supplying oil, the control panel monitors the pressure switch signal of the oil outlet pipeline. If it receives the pressure switch action signal, it controls the motor to return the plunger to the plunger position C, then stops the motor and outputs the normal shutdown signal of the oil pump; If the pressure switch signal is not received and the set maximum working time is reached, the motor is controlled to return the plunger to the plunger position C, the motor stops, and no oil pump normal shutdown signal is output; S7. During the oil pump power supply time, the PLC detects the oil pump normal shutdown signal output by the control board and confirms that the oil pump is working normally. The PLC cuts off the oil pump power supply and waits to be powered on again to control the oil pump to work again. If the PLC does not receive the oil pump normal shutdown signal during the oil pump power supply time, the PLC cuts off the oil pump power supply and outputs an oil pump fault signal to remind the user to check the oil pump.

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