CN112303464A - Grease centralized lubrication system - Google Patents
Grease centralized lubrication system Download PDFInfo
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- CN112303464A CN112303464A CN201910710528.0A CN201910710528A CN112303464A CN 112303464 A CN112303464 A CN 112303464A CN 201910710528 A CN201910710528 A CN 201910710528A CN 112303464 A CN112303464 A CN 112303464A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
- F16N7/38—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated with a separate pump; Central lubrication systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N23/00—Special adaptations of check valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N25/00—Distributing equipment with or without proportioning devices
- F16N25/02—Distributing equipment with or without proportioning devices with reciprocating distributing slide valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N29/00—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems
- F16N29/04—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems enabling a warning to be given; enabling moving parts to be stopped
Abstract
The invention relates to a centralized grease lubricating system which comprises a pump station assembly, a one-way valve, a filter, a two-position three-way electromagnetic directional valve, a two-position four-way electromagnetic directional valve, a flowmeter, a rotary joint, a one-way unloading valve, a two-line distributor, a pressure relay and a PLC control cabinet for controlling the pump station, wherein the pump station assembly, the one-way valve, the filter, the two-position three-way electromagnetic directional valve, the two-position four-way electromagnetic directional valve and the flowmeter are arranged around a winding drum, and the rotary joint is provided with the tail end of the winding drum; two one-way unloading valves and a plurality of double-wire distributors are arranged inside the winding drum rotating at high speed; according to the technical scheme, through the least pipeline design, the one-way unloading valve is additionally arranged behind the last distributor, the two cavities of the distributor are connected, and the pressure operating valve is installed beside the pump station but actually is arranged at the tail end of the pipeline, so that the closed control of the system is realized, and the dead oil phenomenon in the dry oil system is eliminated.
Description
Technical Field
The invention relates to a lubricating system, in particular to a grease centralized lubricating system, and belongs to the technical field of automatic centralized lubricating systems.
Background
The reel has the function of rolling the steel plate into a steel coil, the reel expansion and contraction mechanism mainly comprises a hollow shaft and sector plates surrounding the hollow shaft, a mandrel connected with a hydraulic cylinder is arranged in the hollow shaft, each sector plate is connected with the mandrel through two connecting rods, two wedges are arranged between each sector plate and the mandrel, when a piston rod of the hydraulic cylinder extends out, the mandrel is pushed to move, the sector plates retract under the action of the connecting rods, the diameter of the reel is reduced along with the mandrel, when the piston rod of the hydraulic cylinder retracts, the mandrel is pulled back, the sector plates are unfolded under the action of the wedges, the diameter of the reel is expanded along with the mandrel, so that the sector plates are expanded and contracted through the interaction of the wedges and the connecting rods, the purpose of changing the diameter of the reel is achieved, the reel is used as a core component of a coiling machine, and relative movement parts inside the reel are reliably and effectively lubricated, the stability of the state directly affects the forming and quality of the steel coil. The centralized lubricating system is a system for supplying lubricant to each friction point in the reel, accurately supplies required lubricating oil and grease to a plurality of lubricating points according to a certain time, and mainly comprises a lubricating pump, a reversing valve, a rotary joint, a pressure control valve, a distributor, an electric cabinet and the like. The lubricating grease output by the lubricating pump is alternately sent to the distributor through the two oil supply pipelines by the reversing valve, and the lubricating oil is distributed and conveyed to each lubricating point by the oil supply distributor. The centralized lubricating system of the current reel has one main defect: the pressure control valve is a signaling device which directly converts differential pressure signals into electric signals, in fact, the pressure control valve is a pressure relay, is specially used for controlling the reversing of a reversing valve, and is installed at the tail ends of two main oil supply pipelines of a dry oil centralized lubricating system. Because the restriction of the oilhole quantity of rotary joint, add the high-speed rotation of reel and the inside high temperature of reel, the pressure operating valve can only be installed on the main pipeline that is close rotary joint, can not really install at the very end of system, can appear "dead oil" phenomenon easily in the pipeline, and the distributor in the system mostly is parallelly connected installation, and the main pipe or the branch pipe of any one of them distributor appear blockking, though do not influence the system operation, but can not effective in time discover, cause lubricated position to lack oil and take place the scaling loss phenomenon easily. Related solutions exist in the prior art, but the oil filling device can only be used in a shutdown state and cannot achieve the purpose of online oil filling. Therefore, a new solution to solve the above technical problems is urgently needed.
Disclosure of Invention
The invention provides a dry oil centralized lubricating system aiming at the problems in the prior art, the technical scheme is that through the minimum pipeline design, a one-way unloading valve is additionally arranged behind the last distributor, two cavities of the distributor are connected, and a pressure operating valve is installed beside a pump station but is actually arranged at the tail end of the pipeline, so that the closed control of the system is realized, and the phenomenon of 'dead oil' in the dry oil system is eliminated.
In order to achieve the purpose, the technical scheme of the invention is that the grease centralized lubricating system is characterized by comprising a pump station assembly, a one-way valve, a filter, a two-position three-way electromagnetic directional valve, a two-position four-way electromagnetic directional valve, a flowmeter, a rotary joint, a one-way unloading valve, a two-line distributor, a pressure relay and a PLC control cabinet for controlling the pump station, wherein the pump station assembly, the one-way valve, the filter, the two-position three-way electromagnetic directional valve, the two-position four-way electromagnetic directional valve and the flowmeter are arranged around a winding drum, and the rotary joint is provided with the tail end of the winding drum; two one-way unloading valves and a plurality of two-wire distributors are arranged inside the winding drum rotating at high speed.
As an improvement of the invention, the pump station assembly is simultaneously connected with a one-way valve and a two-position three-way electromagnetic directional valve, and the one-way valve is connected with the two-position four-way electromagnetic directional valve, a flowmeter and a rotary joint through a filter.
As an improvement of the invention, the double-line distributor comprises a distributor body and a control plunger, wherein an upper oil port, a lower oil port and a working piston (with a pointer) are arranged on the distributor body, and an oil passage is also arranged on the distributor body.
The double-line distributor mainly comprises a control plunger and a working piston (with a pointer), is mainly acted under the action of alternate oil supply pressure of two oil supply pipes, directly pushes the working plunger to supply oil by the oil supply pressure to finish the function of quantitatively distributing lubricating grease to each lubricating point, and the plunger of the distributor acts in the forward and reverse directions to respectively discharge the lubricating grease from an oil outlet.
As an improvement of the invention, the one-way unloading valve comprises an adjusting screw, a locking nut, a valve body, a spring seat, a spring, a valve core, a one-way valve core and a spring, wherein the end part of the adjusting screw is provided with the locking nut, the spring is arranged between the valve and the valve core, and the spring is arranged on the single-phase valve core 307.
As an improvement of the invention, the pump station component consists of an oil storage barrel, a motor, a plunger pump, an overflow valve and a pressure gauge and is mainly used for conveying media with pressure and flow to a system pipeline.
A fault detection method for a grease centralized lubrication system is characterized by comprising the following steps: the system has three control states:
1) in a continuous state, a two-position four-way electromagnetic reversing valve coil YH1A is electrified, a two-position three-way electromagnetic reversing valve coil YH2A is electrified, an electromagnetic reversing valve is positioned at a lower working position and connected with an oil storage barrel, once the pressure of a pressure relay returns to zero, the YH2A is electrified, the electromagnetic reversing valve is positioned at an upper working position and a closed state, a pump station assembly operates to output lubricating oil (the oil pressure is slightly lower at the moment), the lubricating oil is fed to the upper working position of the two-position four-way electromagnetic reversing valve through a one-way valve and a filter, the lubricating oil enters an A cavity of the two-wire distributor through an upper oil pipe through an upper flow meter and a rotary joint and enters a P1 port of the upper one-way unloading valve along the oil pipe and is directly output to a P2 port of the lower one-way unloading valve from the P2 port, at the moment, the lower one-way unloading valve is positioned at the closed state, the oil pressure is, B2, C2 and D2 feed oil in sequence, and output 4Q ml of total oil; when the pressure of the lubricating oil is greater than the opening pressure P of the one-way unloading valveKThen, the lower one-way unloading valve is opened, lubricating oil enters a lower oil pipe, the lubricating oil sequentially passes through the two-line distributor, the rotary joint, the two-position four-way electromagnetic directional valve and then the two-position three-way electromagnetic directional valve in a closed state, the pressure of the lubricating oil continues to rise, when the reversing pressure P1 is reached, the pressure relay sends out an electric signal, YH1B is electrified, the two-position four-way electromagnetic directional valve is reversed to a lower working position, meanwhile, a coil YH2A of the two-position three-way electromagnetic directional valve is electrified, the electromagnetic directional valve is positioned at the lower working position, an oil return pipe is connected with the oil storage barrel, once the pressure of the pressure relay returns to zero, YHAt the upper working position and the closing state; lubricating oil continuously enters a cavity B of the double-line distributor through an oil pipe at the lower half part and enters a port P1 of the lower one-way unloading valve along the oil pipe, and is directly output from a port P2 to a port P2 of the upper one-way unloading valve, because the upper one-way unloading valve is in a closed state, the pressure of the lubricating oil is gradually increased, a control plunger and a working piston (with a pointer) of the double-line distributor are pushed to act, oil is sequentially supplied to corresponding lubricating points A1, B1, C1 and D1, and the total oil quantity is output to be 4Q milliliters; when the pressure of the lubricating oil is greater than the opening pressure P of the one-way unloading valveKThen, the upper one-way unloading valve is opened, lubricating oil enters an upper oil pipe, sequentially passes through the two-line distributor, the rotary joint, the two-position four-way electromagnetic reversing valve and the two-position three-way electromagnetic reversing valve in a closed state, the pressure of the lubricating oil continues to rise, when the reversing pressure P1 is reached, the pressure relay 10 sends out an electric signal, YH1A and YH2A are powered on, and the previous action is repeated;
2) in the automatic state, after the pump station assembly stops, a time relay starts to time T, when T = T1, the lubrication pump is automatically started to execute a continuous program, YH1A is powered on, YH1B is powered on, then YH1A is powered on, the number n of circulation times is set, and when n = n1, the pump station stops running;
3) in a stopping state, the pump station assembly stops, YH2A is powered on, YH1A and YH1B are powered on once respectively, the two-position four-way electromagnetic directional valve 5 is reversed twice, and residual oil in an oil return pipeline enters an oil tank, so that pressure relief is realized during pipeline maintenance mainly for the purpose of protecting;
wherein the continuous state and the automatic state are provided with the following two alarms:
and (4) overtime alarm: the pumping station assembly is started, YH1A is powered on, the PLC control unit starts to time T, when T = T1, an alarm is given, the pumping station assembly stops running, and similarly YH1B is powered on, the PLC control unit starts to time T, when T = T1, the system also gives an alarm, and the overtime alarm is mainly caused by the following two aspects: the main pipe is blocked, the pressure oil can not reach the pressure relay at the tail end, and a reversing electric signal can not be sent out. The judging method comprises the following steps: the reading of the flowmeter is almost zero, and the system pressure is high; the main pipe leaks oil, the system can not build pressure, the pressure oil can not reach the tail end pressure relay, and a reversing electric signal can not be sent out; the judging method comprises the following steps: the reading of the flowmeter is far more than 4Q, and the system can not build pressure; and (4) low-flow alarm is carried out, each reversing process is not abnormal, but the reading difference of an upper flowmeter and a lower flowmeter is lower than 4Q, and a double-line distributor needs to be checked in time when an outlet branch pipe of a certain distributor is blocked.
Compared with the prior art, the invention has the advantages that through the minimum pipeline design, the one-way unloading valve is additionally arranged behind the last distributor, the two cavities of the distributor are connected, the pressure operating valve is installed beside the pump station but is actually arranged at the tail end of the pipeline, the closed control of the system is realized, the oil-dead phenomenon in a dry oil system is eliminated, the condition of the system state is judged under the control of the flow meter, the time relay and the pressure relay, and the equipment damage caused by oil shortage of a lubricating point is prevented. Drawings
Fig. 1 is a schematic view of the present two-wire distributor.
Fig. 2 is a schematic structural diagram of the one-way unloading valve of the invention.
FIG. 3 is a schematic diagram of the system of the present invention.
In the figure, 1 is a pump station assembly, 2 is a one-way valve, 3 is a filter, 4 is a two-position three-way electromagnetic directional valve, 5 is a two-position four-way electromagnetic directional valve, 6 is a flow meter, 7 is a rotary joint, 8 is a one-way unloading valve, 9 is a two-line distributor and 10 is a pressure relay. 201-distributor body, 202-upper oil port, 203-piston pointer, 204 and 206-oil channel, 205-control plunger, 207-lower oil port. 301-adjusting screw, 302-locking nut, 303-valve body, 304-spring seat, 305-spring, 306-valve core, 307-one-way valve core and 308-spring.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1, a centralized grease lubricating system comprises a pump station assembly 1, a one-way valve 2, a filter 3, a two-position three-way electromagnetic directional valve 4, a two-position four-way electromagnetic directional valve 5, a flowmeter 6, a rotary joint 7, a one-way unloading valve 8, a two-line distributor 9, a pressure relay 10 and a PLC control cabinet for controlling the pump station, wherein the pump station assembly 1, the one-way valve 2, the filter 3, the two-position three-way electromagnetic directional valve 4, the two-position four-way electromagnetic directional valve 5 and the flowmeter 6 are installed around a winding drum, and the rotary joint 7 is provided with the tail end of the winding drum; two one-way unloading valves 8 and a plurality of double-line distributors 9 are installed inside a high-speed rotating winding drum, the pump station assembly 1 is simultaneously connected with a one-way valve 2 and a two-position three-way electromagnetic directional valve 4, the one-way valve 2 is connected with a two-position four-way electromagnetic directional valve 5, a flowmeter 6 and a rotary joint 7 through a filter 3, the double-line distributors 9 comprise a distributor body 201 and a control plunger 205, an upper oil port 202, a lower oil port 207 and a working piston (with a pointer) 203 are arranged on the distributor body 201, and oil ducts 204 and 206 are further arranged on the distributor body 201. The double-line distributor mainly comprises a plunger 205 and a working piston (with a pointer) 203, and is mainly used for directly pushing the working plunger to supply oil by the oil supply pressure under the action of the alternate oil supply pressure of two oil supply pipes, so that the function of quantitatively distributing lubricating grease to each lubricating point is completed, the plunger of the distributor acts in the forward and reverse directions and discharges the lubricating grease from an oil outlet respectively, the one-way unloading valve 8 comprises an adjusting screw 301, a locking nut 302, a valve body 303, a spring seat 304, a spring 305, a valve core 306, a one-way valve core 307 and a spring 308, the end part of the adjusting screw 301 is provided with the locking nut 302, the spring 305 is arranged between the valve 303 and the valve core 306, and the spring 308 is arranged in a groove hole of the one-way. The pump station component consists of an oil storage barrel 101, a motor 102, a plunger pump 103, an overflow valve 104 and a pressure gauge 105 and is mainly used for conveying media with pressure and flow to a system pipeline.
The working process is as follows: referring to fig. 1, the installation of the technical solution is described as follows:
fig. 1 is a schematic diagram of a dual-line distributor, in which when an oil is fed into port a (at this time, oil in port B is not pressurized), pressure oil pushes a control plunger 205 to move downward, port a is communicated with an oil passage 204 (206 and 207), pressure oil enters the upper part of a working piston (with a pointer) 203, and under the action of the pressure oil, the working piston (with the pointer) 203 is pushed to move downward, so that the oil at the lower part is pushed into the oil passage 206 and is output through the oil port 207; when oil enters the port B, pressure oil pushes the control plunger 205 to move upwards, the port B is communicated with the oil passage 206 (204 and 202), the pressure oil enters the lower part of the working piston (with a pointer) 203, and under the action of the pressure oil, the working piston (with the pointer) 203 is pushed to move upwards, so that the oil at the upper part is extruded into the oil passage 204 and is output through the oil port 202.
Fig. 2 is a schematic diagram of a one-way unloading valve, which is essentially a combination of a one-way valve and an unloading valve. When oil enters a port P1 in the figure, pressure oil is divided into two paths, one path of oil is filled upwards between the spring seat 304 and the valve core 306, and the valve core 306 and the valve body 303 interact to block the pressure oil under the combined action of the spring 305 and the pressure oil; the other path of oil pushes the one-way spool 307 to the right, and the pressure oil is output from port P2. When oil enters from the port P2, pressure oil enters into both sides of the valve core 306 through the one-way valve core 307 (the one-way valve is closed), at this time, the valve core 306 is in a closed state under the action of the spring 305, when the pressure of the oil gradually increases and the force acting on the valve core 306 is larger than the acting force of the spring 305, the valve core 306 moves leftwards, the unloading valve is opened, and the pressure oil is output from the port P1. The opening pressure of the unloading valve is PK。
Fig. 3 is a centralized lubricating system for a winding drum, which mainly comprises the following parts: the device comprises a pump station component 1, a one-way valve 2, a filter 3, a two-position three-way electromagnetic directional valve 4, a two-position four-way electromagnetic directional valve 5, a flowmeter 6, a rotary joint 7, a one-way unloading valve 8, a double-line distributor 9, a pressure relay 10, a PLC control cabinet for controlling the pump station and the like.
The pump station component 1, the one-way valve 2, the filter 3, the two-position three-way electromagnetic directional valve 4, the two-position four-way electromagnetic directional valve 5 and the flowmeter 6 are arranged near the winding drum. The rotary joint 7 is arranged at the tail end of the winding drum; two one-way unloading valves 8 and a plurality of two-line distributors 9 (for convenience of description, 4 are taken as an example in the present case) are installed inside the drum rotating at a high speed.
The above parts are connected by oil pipes as shown in fig. 3, and 4 double-line distributors 9 have 8 output lubrication points in total, which are: a1, B1, C1, D1, A2, B2, C2 and D2, wherein the oil amount of each lubricating point is Q milliliters.
The PLC control unit sets a logic control program according to the following parameters: 1. pump start interval time T1, 2, solenoid valve commutation cycle times n1, 3 after pump start, timeout alarm time T2, 4, end commutation pressure P1.
The system has the following three control states:
as shown in fig. 3, the coil YH1A of the two-position four-way electromagnetic directional valve 5 is electrified, the coil YH2A of the two-position three-way electromagnetic directional valve 4 is electrified, the electromagnetic directional valve 4 is positioned at the lower working position oil return pipe connected with the oil storage barrel, when the pressure of the pressure relay 10 is zero, YH2A is deenergized, the electromagnetic directional valve 4 is positioned at the upper working position and closed state, the pump station component 1 operates to output lubricating oil (the oil pressure is slightly lower at the moment), the lubricating oil is fed to the upper working position of the two-position four-way electromagnetic directional valve 5 through the one-way valve 2 and the filter 3, passes through the upper flowmeter 6 and the rotary joint 7, the lubricating oil enters the cavity a of the two-wire distributor 9 through the upper half oil pipe, and enters the port P1 of the upper one-way unloading valve 8 along the oil pipe, and is directly output to the port P2 of the lower one-way unloading valve 8 from the port P2, and the lower one-way unloading valve 8 is positioned at the closed state, sequentially feeding oil to corresponding lubricating points A2, B2, C2 and D2, and outputting 4Q milliliters of total oil; when the pressure of the lubricating oil is greater than the opening pressure P of the one-way unloading valve 8KThen, the lower one-way unloading valve 8 is opened, lubricating oil enters a lower oil pipe, the lubricating oil sequentially passes through the two-line distributor 9, the rotary joint 7, the two-position four-way electromagnetic directional valve 5 and then reaches the two-position three-way electromagnetic directional valve 4 in a closed state, the pressure of the lubricating oil continues to rise, when the reversing pressure P1 is reached, the pressure relay 10 sends out an electric signal, YH1B is electrified, the two-position four-way electromagnetic directional valve 5 is reversed to a lower working position, meanwhile, a coil YH2A of the two-position three-way electromagnetic directional valve 4 is electrified, the electromagnetic directional valve 4 is positioned at the lower working position and is connected with an oil storage barrel, once the pressure of the pressure relay 10 returns to zero, YH2A is electrified, and the electromagnetic directional valve 4 is positioned at; lubricating oil continuously enters a cavity B of the double-line distributor 9 through an oil pipe at the lower half part and enters a port P1 of the lower one-way unloading valve 8 along the oil pipe, and is directly output from a port P2 to a port P2 of the upper one-way unloading valve 8, the pressure of the lubricating oil is gradually increased due to the fact that the upper one-way unloading valve 8 is in a closed state, a control plunger 205 and a working piston (with a pointer) 203 of the double-line distributor 9 are pushed to move, oil is sequentially fed corresponding to lubricating points A1, B1, C1 and D1, and the total oil quantity is output to be 4Q milliliters; when the pressure of the lubricating oil is greater than the opening pressure P of the one-way unloading valve 8KRear, upper one-way unloading valve8, opening, lubricating oil enters an upper oil pipe, sequentially passes through a double-line distributor 9, a rotary joint 7, a two-position four-way electromagnetic directional valve 5 and a closed two-position three-way electromagnetic directional valve 4, the pressure of the lubricating oil is continuously increased, when the reversing pressure P1 is reached, a pressure relay 10 sends out an electric signal, YH1A and YH2A are electrified, and the previous action is repeated!
And in the automatic state, after the pump station assembly 1 stops, a time relay starts to time T, when T = T1, the lubrication pump is automatically started to execute a continuous program, YH1A is powered on, YH1B is powered on, and YH1A is powered on for a cycle number n, and when n = n1, the pump station stops running.
And in the stop state, the pump station assembly 1 is stopped, YH2A is powered on, YH1A and YH1B are powered on once respectively, the two-position four-way electromagnetic directional valve 5 is reversed twice, and residual oil in an oil return pipeline enters an oil tank, so that pressure relief is realized during pipeline maintenance mainly for the purpose of protecting.
In order to ensure the reliability of the lubrication of key parts in the winding drum, the following two alarms are set in a continuous state and an automatic state: and (4) overtime alarm: the pump station assembly 1 is started, YH1A is powered on, the PLC control unit starts to time T, and when T = T1, an alarm is given, and the pump station assembly 1 stops running. When YH1B is powered on, the PLC control unit starts to time T, and when T = T1, the system also gives an alarm. The overtime alarm is mainly caused by the following two aspects: the main pipe is blocked, the pressure oil can not reach the pressure relay 10 at the tail end, and the reversing electric signal can not be sent out. The judging method comprises the following steps: the reading of the flow meter 6 is almost zero and the system pressure is high. The main pipe leaks oil, the system can not build pressure, the pressure oil can not reach the tail end pressure relay 10, and a reversing electric signal can not be sent out. The judging method comprises the following steps: the flow meter 6 reading is much greater than 4Q and the system cannot build pressure. And (4) low-flow alarm is carried out, each reversing process is not abnormal, but the reading difference of the upper flowmeter 6 and the lower flowmeter 6 is lower than 4Q, and a double-line distributor needs to be checked in time when an outlet branch pipe of a certain distributor is blocked. By adopting the measures, when the main pipe or the branch pipe in the winding drum is blocked, the blockage can be found in time, various defects in background description are avoided, and various beneficial effects in the invention content are smoothly realized.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (6)
1. A centralized grease lubricating system is characterized by comprising a pump station assembly, a one-way valve, a filter, a two-position three-way electromagnetic reversing valve, a two-position four-way electromagnetic reversing valve, a flowmeter, a rotary joint, a one-way unloading valve, a two-line distributor, a pressure relay and a PLC control cabinet for controlling the pump station, wherein the pump station assembly, the one-way valve, the filter, the two-position three-way electromagnetic reversing valve, the two-position four-way electromagnetic reversing valve and the flowmeter are arranged around a winding drum, and the rotary joint is arranged at the tail end of the winding drum; two one-way unloading valves and a plurality of two-wire distributors are arranged inside the winding drum rotating at high speed.
2. The centralized grease lubricating system according to claim 1, wherein the pump station assembly is connected with a one-way valve and a two-position three-way electromagnetic directional valve at the same time, and the one-way valve is connected with the two-position four-way electromagnetic directional valve, a flowmeter and a rotary joint through a filter.
3. The dry oil centralized lubrication system as claimed in claim 1, wherein the dual line distributor comprises a distributor body and a control plunger, the distributor body is provided with an upper oil port, a lower oil port and a working piston (with a pointer), and the distributor body is further provided with oil channels (204) and (206); the double-line distributor mainly comprises a plunger and a working piston (with a pointer), is mainly used for directly pushing the working plunger to supply oil by the oil supply pressure under the action of the alternate oil supply pressure of the two oil supply pipes, and completes the function of quantitatively distributing lubricating grease to each lubricating point, and the plunger of the distributor acts in the forward and reverse directions to respectively discharge the lubricating grease from an oil outlet.
4. The grease centralized lubrication system according to claim 2, wherein the one-way unloading valve comprises an adjusting screw, a locking nut, a valve body, a spring seat, a spring, a valve core, a one-way valve core and a spring, the end of the adjusting screw is provided with the locking nut, the spring is arranged between the valve and the valve core, and the spring is arranged on the one-way valve core.
5. The centralized grease lubrication system according to claim 3, wherein the pump station assembly comprises an oil storage barrel, a motor, a plunger pump, an overflow valve and a pressure gauge, and is mainly used for conveying media with pressure and flow to a system pipeline.
6. The method for detecting the fault of the dry oil centralized lubrication system according to any one of claims 1 to 5, wherein the method comprises the following steps: the system has three control states:
1) in a continuous state, a coil YH1A of the two-position four-way electromagnetic directional valve 5 is electrified, a coil YH2A of the two-position three-way electromagnetic directional valve is electrified, the electromagnetic directional valve is positioned at a lower working position and connected with an oil storage barrel, once the pressure of a pressure relay is zero, the YH2A is electrified, the electromagnetic directional valve is positioned at an upper working position and a closed state, a pump station assembly operates to output lubricating oil (the oil pressure is slightly lower at the moment), the lubricating oil is fed to the upper working position of the two-position four-way electromagnetic directional valve through a one-way valve and a filter, the lubricating oil enters an A cavity of the two-wire distributor through an upper oil pipe through an upper flow meter and a rotary joint and enters a P1 port of the upper one-way unloading valve along the oil pipe and is directly output to a P2 port of the lower one-way unloading valve from the P2 port, the lower one-way unloading valve is positioned at the closed state, the lubricating oil pressure is gradually, B2, C2 and D2 feed oil in sequence, and output 4Q ml of total oil; when the pressure of the lubricating oil is greater than the opening pressure P of the one-way unloading valveKThen, the lower one-way unloading valve is opened, the lubricating oil enters the lower oil pipe, the pressure of the lubricating oil is continuously increased from the two-way distributor, the rotary joint, the two-position four-way electromagnetic reversing valve to the two-position three-way electromagnetic reversing valve in a closed state, the pressure relay sends out an electric signal when the reversing pressure P1 is reached, YH1B is electrified, the two-position four-way electromagnetic reversing valve is reversed to a lower working position and is in the same position as the lower working positionWhen the two-position three-way electromagnetic reversing valve coil YH2A is electrified, the electromagnetic reversing valve is positioned at the lower working position, the oil return pipe is connected with the oil storage barrel, once the pressure of the pressure relay returns to zero, YH2A is electrified, and the electromagnetic reversing valve is positioned at the upper working position and in a closed state; lubricating oil continuously enters a cavity B of the double-line distributor through an oil pipe at the lower half part and enters a port P1 of the lower one-way unloading valve along the oil pipe, and is directly output from a port P2 to a port P2 of the upper one-way unloading valve, because the upper one-way unloading valve is in a closed state, the pressure of the lubricating oil is gradually increased, a control plunger and a working piston (with a pointer) of the double-line distributor are pushed to act, oil is sequentially supplied to corresponding lubricating points A1, B1, C1 and D1, and the total oil quantity is output to be 4Q milliliters; when the pressure of the lubricating oil is greater than the opening pressure P of the one-way unloading valveKThen, the upper one-way unloading valve is opened, lubricating oil enters an upper oil pipe, sequentially passes through the two-line distributor, the rotary joint, the two-position four-way electromagnetic reversing valve and the two-position three-way electromagnetic reversing valve in a closed state, the pressure of the lubricating oil is continuously increased, when the reversing pressure P1 is reached, the pressure relay sends out an electric signal, YH1A and YH2A are powered on, and the previous action is repeated;
2) in the automatic state, after the pump station assembly stops, a time relay starts to time T, when T = T1, the lubrication pump is automatically started to execute a continuous program, YH1A is powered on, YH1B is powered on, then YH1A is powered on, the number n of circulation times is set, and when n = n1, the pump station stops running;
3) in a stop state, the pump station component 1 stops, YH2A is powered on, YH1A and YH1B are powered on once respectively, the two-position four-way electromagnetic directional valve is reversed twice, and residual oil in an oil return pipeline enters an oil tank, so that pressure relief is realized during pipeline maintenance mainly for the purpose of protecting;
wherein the continuous state and the automatic state are provided with the following two alarms:
and (4) overtime alarm: the pumping station assembly 1 is started, YH1A is powered on, the PLC control unit starts to time T, when T = T1, an alarm is given, the pumping station assembly 1 stops running, and similarly YH1B is powered on, the PLC control unit starts to time T, when T = T1, the system also gives an alarm, and the overtime alarm is mainly caused by the following two aspects: the main pipe is blocked, the pressure oil can not reach the pressure relay at the tail end, and a reversing electric signal can not be sent out; the judging method comprises the following steps: the reading of the flowmeter is almost zero, and the system pressure is high; the main pipe leaks oil, the system can not build pressure, the pressure oil can not reach the terminal pressure relay, and a reversing electric signal can not be sent out, and the judgment method comprises the following steps: the reading of the flowmeter is far more than 4Q, and the system can not build pressure; and (4) low-flow alarm is carried out, each reversing process is not abnormal, but the reading difference of an upper flowmeter and a lower flowmeter is lower than 4Q, and a double-line distributor needs to be checked in time when an outlet branch pipe of a certain distributor is blocked.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113586924A (en) * | 2021-07-30 | 2021-11-02 | 青岛盘古智能制造股份有限公司 | Double-wire type centralized lubrication control system and control method |
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