JP5280645B2 - Centralized lubricator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centralized lubrication apparatus capable of accurately detecting a quantity of supply of lubricating oil supplied to a plurality of oil supply sections and rapidly and precisely determining the presence of a leakage of the lubricating oil or an improper supply of the lubricating oil. <P>SOLUTION: A drive means 2 is driven to advance a piston 13 of a cylinder pump 4, the pressure of the lubricating oil supplied from the cylinder pump 4 to each continuous flow valve 3 is raised to a level above the working pressure to thereby discharge a predetermined quantity of lubricating oil from the continuous flow valve 3, and the driving of the drive means 2 is stopped so as to lower the pressure of the lubricating oil to a level below the working pressure. By repeating such a lubricating oil supplying operation, the predetermined quantity of lubricating oil is intermittently discharged from each continuous flow valve 3. Based on the actual amount of movement obtained by subtracting the amount of retreating movement of the piston 13 by the stopping of the driving from the amount of the advancing movement of the piston 13 by the driving of the drive means 2, a total discharge quantity of the lubricating oil discharged by a lubricating oil supplying operation is calculated. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a centralized lubricating device that supplies lubricating oil by pumping it and distributing it to a plurality of locations.

  Conventionally, there is a centralized lubrication device that feeds lubricating oil stored in a tank with a pump, distributes it with a distributor, and supplies it to a plurality of locations. For example, machine tools such as machining centers and transfer machines have a large number of sliding portions, and a centralized lubricating device is used as a device for supplying lubricating oil to the large number of sliding portions.

  As shown in FIG. 7, which illustrates a conventional technology, a conventional centralized lubrication apparatus 100 is illustrated with a storage tank 101 that stores lubricating oil, a pumping pump 102 that pumps lubricating oil in the storage tank 101, and A plurality of metering valves 103 attached to the lubrication points of the sliding parts of the machine tool that are not connected to each other and the pump pump 102 and the distributor 104 are communicated with each other by one main flow passage, and by a plurality of branch passages. An oil supply pipe 105 that communicates between the distributor 104 and each metering valve 103, a pressure sensor 106 that detects the pressure of the lubricating oil in the oil supply pipe 105, and a pressure feed pump 102 based on a detection signal from the pressure sensor 106. A control device 107 for controlling is provided.

When the metering valve 103 is supplied with lubricating oil having a prescribed operating pressure, the metering valve 103 is configured to discharge the lubricating oil by a certain amount. The control device 107 drives the pumping pump 102 at an interval of once every 30 minutes, for example. By driving the pressure pump 102, the lubricating oil in the storage tank 101 is pumped into the fuel supply pipe 105, the pressure of the lubricating oil in the supply oil pipe 105 is increased to operating pressure, a certain amount of lubricating oil from each metered valve 103 Is discharged and supplied to each lubrication location.

  The metering valve 103 is closed when the lubricating oil is discharged. Therefore, when all the metering valves 103 finish discharging the lubricating oil, the pressure of the lubricating oil in the oil supply pipe 105 further rises above the operating pressure.

  When the pressure sensor 106 detects that the pressure in the oil supply pipe 105 has risen above the operating pressure, the control device 107 performs control to stop driving the pressure feed pump 102. By the above control, for example, about 0.1 cc of lubricating oil is supplied at one time per place.

  As described above, the centralized lubrication apparatus 100 is directly connected to the pressure feed pump 102 and the metering valve 103 by the oil supply pipe 105, and the condition is that the pressure of the lubricating oil in the oil supply pipe 105 is higher than the operating pressure. It is assumed that the lubricating oil is discharged from each metering valve 103.

  Therefore, these cannot be detected when the lubricating oil leaks in the middle of the oil supply pipe 105 or when the metering valve 103 is not normally supplied to the lubricated portion due to malfunction of the metering valve 103 or clogging of the pipe. The leakage of the lubricating oil causes the coolant liquid to become dirty and the consumption amount of the lubricating oil to be excessive. The poor supply of the lubricating oil may cause the sliding portion to become galled or seized.

  As a technique for detecting such a leakage of lubricating oil, first and second level sensors for detecting the liquid level of the lubricating oil are provided at different positions of the lubricating oil tank of the centralized lubricating device, The oil of the centralized lubrication device that detects and warns of the presence or absence of oil leakage in the pipe by comparing the time from when the liquid level reaches the first level to the second level with the set time. A leak detection device has been proposed (see, for example, Patent Document 1).

  In addition, as a technique for detecting whether the lubricating oil is normally supplied, the pressure of the greasing pipe is reduced momentarily when the greasing valve is actuated by supplying the working pressure, Detected as pressure fluctuation by the sensor, if the number of lubrication valves and the count number of pressure fluctuation match, it is judged that there is no clogging, that is, lubricating oil is supplied normally, and if it does not match, there is clogging. That is, a greasing state detection method for determining that the lubricating oil is not normally supplied has been proposed (see, for example, Patent Document 2).

  In addition, as a device for detecting whether the lubricating oil is properly supplied by the centralized lubricating device, a flow sensor and a temperature sensor are provided in all the oil supply pipes leading to the respective lubrication points, and the signals of each flow sensor and each temperature sensor are provided. Is input to the computer, and the oil supply amount for each oil supply pipe is calculated, checked against the preset oil supply amount to determine if there is an abnormality, and an alarm is output if the lubricating oil is not properly supplied in the event of an abnormality. An apparatus has been proposed (see, for example, Patent Document 3).

JP 2003-236732 A JP 2000-356297 A Japanese Utility Model Publication No. 6-22695

  However, in the technique described in Patent Document 1, when a large amount of lubricating oil is leaking, the change in the liquid level in the lubricating oil tank is large, and the leakage of lubricating oil can be detected at an early stage. When there is a small amount of leakage from the pinhole due to loosening or corrosion of the joint, the change in the liquid level is slow, and there is a risk that a large amount of lubricating oil will leak before it is judged that leakage has occurred.

  Moreover, in the technique described in Patent Document 2, when used for lubrication of a large machine facility or a large number of machine devices, the resistance is large at the oil supply point far away from the automatic grease pump, and the pressure fluctuation is remarkable. It does not appear and detection by the pressure sensor is difficult, and it is difficult to accurately determine whether or not the grease supply is properly performed from the grease supply valve.

  Furthermore, in the technique described in Patent Document 3, since the temperature sensor and the flow rate sensor are provided for each oil supply location, the number of parts increases and the cost increases. In addition, electrical wiring for connecting each sensor and the control unit is required, and there is a problem that the structure is complicated and the construction is complicated. Moreover, when the amount of oil supply per one time is very small, highly accurate detection cannot be performed by a flow sensor such as an area flow meter or a turbine flow meter.

  The present invention has been made in view of these problems, and an object of the present invention is to provide a centralized lubrication capable of quickly and accurately detecting a small amount of leakage of lubricating oil and a supply failure to a lubrication point with a simple configuration. To provide an apparatus.

The centralized lubricating device according to the first aspect of the present invention that solves the above-described problem includes a plurality of metering valves that perform an operation of discharging a certain amount of lubricating oil by receiving supply of lubricating oil having a preset operating pressure. A piston is accommodated in a cylinder chamber communicating with each metering valve via a pipe and storing lubricating oil so as to be reciprocally movable. Lubricating oil in the cylinder chamber is supplied to each metering valve by the forward movement of the piston. A cylinder pump that moves the piston of the cylinder pump forward by driving to increase the pressure of the lubricating oil supplied to each metering valve to the operating pressure, and the lubricant that is supplied to each metering valve by stopping driving. The driving means for reducing the pressure below the operating pressure, and the driving and stopping of the driving means are repeatedly operated based on conditions set in advance as one lubricating oil supply operation. Control means for performing control to discharge a constant amount of lubricating oil intermittently from each of the metering valves, forward movement amount of the piston by driving of the driving means, and retraction of the piston by stopping driving of the driving means A piston movement amount measuring means for measuring the movement amount; and subtracting a backward movement amount from the forward movement amount of the piston measured by the piston movement amount measurement means to calculate an actual movement amount of the piston; possess a total discharge amount calculating means for calculating by the one of the lubricating oil supply operation based on the amount of total discharge amount of lubricating oil discharged from the respective shutoff valve, the total calculated by the total discharge quantity calculating means When the total discharge amount is calculated by the storage unit for storing the discharge amount and the total discharge amount calculation unit, the calculated total discharge amount is set as the current total discharge amount, and the previous total stored in the storage unit is stored. Discharge amount The total discharge amount, a somewhat judging means for comparing the current total discharge amount and the previous total discharge amount to determine a degree, and the current total discharge amount is more than the previous total discharge amount by the some judgment means. A threshold value judging means for judging whether or not a difference between the current total discharge quantity and the previous total discharge quantity is larger than a preset threshold when it is judged that the current total discharge quantity is large; When it is determined that the difference between the amount and the previous total discharge amount is greater than a preset threshold value, it is determined that a lubricating oil leak has occurred, and the current total discharge amount is When it is determined that the total discharge amount is equal to or less than the total discharge amount, or when the difference between the current total discharge amount and the previous total discharge amount is determined to be equal to or less than the threshold value by the threshold determination unit, it is determined that no lubricating oil leakage has occurred. And having a lubricating oil leakage judging means .

  According to the first aspect of the present invention, the piston of the cylinder pump is moved forward by the drive of the driving means, the lubricating oil having the operating pressure is supplied from the cylinder pump to each metering valve, and a fixed amount is supplied from each metering valve. The lubricating oil can be discharged. Then, when the driving means is stopped, the pressure of the lubricating oil supplied to each metering valve is reduced below the operating pressure, and when the driving means is driven next, the lubricating oil having the operating pressure is again supplied to each metering valve. It can be provided so that a certain amount of lubricating oil can be discharged.

  By repeating the driving and driving stop of the driving means based on a preset condition as a single lubricating oil supply operation, a fixed amount of lubricating oil can be intermittently discharged from each metering valve.

  Then, the forward movement amount of the piston due to the drive of the driving means and the backward movement amount of the piston due to the drive stop of the driving means are measured, and the backward movement amount is subtracted from the forward movement amount, and the piston in one lubricating oil supply operation And the total amount of lubricant discharged from each metering valve is calculated based on the actual amount of travel, so the amount of lubricant discharged from each metering valve by one lubricating oil supply operation is calculated. An accurate total discharge amount can be obtained.

Therefore, the total discharge amount calculated by the total discharge amount calculation unit by comparing the current total discharge amount, which is the total discharge amount calculated by the total discharge amount calculation unit, with the previous total discharge amount stored in the storage unit. Compare the current total discharge amount, which is the amount, with the previous total discharge amount, which is the previous total discharge amount stored in the storage means, and judge a little, and the current total discharge amount is more than the previous total discharge amount If it is determined that there is a large amount, it is determined whether or not the difference between the current total discharge amount and the previous total discharge amount is larger than a threshold value, and it is determined that the difference between the current total discharge amount and the previous total discharge amount is larger than the threshold value. If this happens, it is determined that a lubricating oil leak has occurred. When the current total discharge amount is compared with the previous total discharge amount and the current total discharge amount is determined to be less than or equal to the previous total discharge amount, or the current total discharge amount is greater than the previous total discharge amount, but the current total discharge amount If it is determined that the difference between the total discharge amount and the previous total discharge amount is smaller than the threshold value, it is determined that no lubricating oil leakage has occurred.

This makes it possible to determine whether or not lubricating oil leakage has occurred by comparing the total discharge amount calculated each time a single lubricating oil supply operation is performed, and to quickly determine the presence or absence of lubricating oil leakage. Can do. Therefore, it is possible to quickly and accurately determine the presence or absence of lubricating oil leakage between the cylinder pump and each metering valve, and the poor supply of lubricating oil to the lubrication location.

  In addition, since an accurate total discharge amount can be obtained, not only a large amount of lubricating oil leaks, complete clogging of piping, complete operation of the metering valve, but also lubricating oil that oozes out from, for example, pipe joints, etc. Of pipes such as minute leakage of lubricating oil from pinholes formed in the pipe due to corrosion of cutting debris accumulated on the pipe, or the passage in the pipe being narrowed by dust, etc. Incomplete clogging, supply failure to the extent that a certain amount of lubricating oil cannot be completely discharged due to slow operation of the metering valve, and the like can be accurately determined.

A centralized lubricating device according to a second aspect of the present invention includes a plurality of metering valves that perform an operation of discharging a certain amount of lubricating oil by receiving supply of lubricating oil having a preset operating pressure, and each of the metering valves A cylinder pump that is reciprocally moved in a cylinder chamber that is communicated via a pipe and in which lubricating oil is stored, and that forwardly moves the piston to supply the lubricating oil in the cylinder chamber to the metering valves; The piston of the cylinder pump is moved forward by driving to increase the pressure of the lubricating oil supplied to each metering valve to the operating pressure, while the pressure of the lubricating oil supplied to each metering valve by driving is stopped from the operating pressure. Driving means for lowering, and driving and stopping of the driving means are repeatedly operated based on a preset condition as a single lubricant supply operation, The control means for controlling the discharge of a constant amount of lubricating oil intermittently, the forward movement amount of the piston by driving the driving means, and the backward movement amount of the piston by stopping driving of the driving means are measured. A piston movement amount measuring means; and subtracting a backward movement amount from the piston forward movement amount measured by the piston movement amount measurement means to calculate an actual movement amount of the piston; A total discharge amount calculating means for calculating a total discharge amount of the lubricating oil discharged from each of the metering valves by the lubricating oil supply operation, and storing the total discharge amount calculated by the total discharge amount calculating means When the total discharge amount is calculated by the means and the total discharge amount calculation unit, the calculated total discharge amount is set as the current total discharge amount, and the previous total discharge amount stored in the storage unit is set as the previous total discharge amount. Before quantity and A determination unit that determines a certain amount by comparing the current total discharge amount and the previous total discharge amount, and the determination unit determines that the current total discharge amount is smaller than the previous total discharge amount Threshold determining means for determining whether or not a difference between the current total discharge amount and the previous total discharge amount is larger than a preset threshold value, and the current total discharge amount and the previous total discharge by the threshold determination means. When it is determined that the difference from the amount is greater than a preset threshold value, it is determined that a lubricant supply failure has occurred, and the current total discharge amount is greater than or equal to the previous total discharge amount by the determination unit. Or when the difference between the current total discharge amount and the previous total discharge amount is determined to be equal to or less than the threshold value by the threshold determination unit, it is determined that no lubricating oil supply failure has occurred. It has an oil supply failure determination means.

According to the second aspect of the present invention, by driving the driving means, the piston of the cylinder pump is moved forward, the lubricating oil having the operating pressure is supplied from the cylinder pump to each metering valve, and a fixed amount is supplied from each metering valve. The lubricating oil can be discharged. Then, when the driving means is stopped, the pressure of the lubricating oil supplied to each metering valve is reduced below the operating pressure, and when the driving means is driven next, the lubricating oil having the operating pressure is again supplied to each metering valve. It can be provided so that a certain amount of lubricating oil can be discharged.

By repeating the driving and driving stop of the driving means based on a preset condition as a single lubricating oil supply operation, a fixed amount of lubricating oil can be intermittently discharged from each metering valve.

Then, the forward movement amount of the piston due to the drive of the driving means and the backward movement amount of the piston due to the drive stop of the driving means are measured, and the backward movement amount is subtracted from the forward movement amount, and the piston in one lubricating oil supply operation And the total amount of lubricant discharged from each metering valve is calculated based on the actual amount of travel, so the amount of lubricant discharged from each metering valve by one lubricating oil supply operation is calculated. An accurate total discharge amount can be obtained.

Therefore, when the total discharge amount is calculated by the storage unit that stores the total discharge amount calculated by the total discharge amount calculation unit and the total discharge amount calculation unit, the calculated total discharge amount is set as the current total discharge amount and stored. The previous total discharge amount stored in the means is set as the previous total discharge amount, the current total discharge amount is compared with the previous total discharge amount, and a little judgment means for judging a little, Threshold determination means for determining whether or not the difference between the current total discharge amount and the previous total discharge amount is larger than a preset threshold when it is determined that the current total discharge amount is smaller than the previous total discharge amount; If it is determined that the difference between the current total discharge amount and the previous total discharge amount is greater than a preset threshold value, it is determined that a lubricant supply failure has occurred, and the current total discharge amount is somewhat determined by the determination means. Is determined to be greater than the previous total discharge amount, or the current total It determined that insufficient supply of the lubricating oil does not occur when the difference between the output and before the total discharge amount is determined to the threshold value or less.

  Therefore, it is possible to determine whether or not a lubricating oil supply failure has occurred each time the lubricating oil supply operation is performed, and to quickly determine the lubricating oil supply failure. Therefore, it is possible to prevent wear and backlash of the sliding portion due to lack of lubricating oil, and to prevent deterioration of the processing accuracy of the machine tool.

  And since the total discharge amount in one lubricating oil supply operation | movement is obtained correctly, the supply shortage amount of lubricating oil can be grasped | ascertained correctly. In addition, since it is determined whether or not the difference between the current total discharge amount and the previous total discharge amount is greater than the threshold value, errors in the total discharge amount caused by the lubricating oil supply operation can be excluded, resulting in poor supply of lubricating oil. It can be accurately determined whether or not.

According to a third aspect of the present invention, in the centralized lubrication apparatus according to the first or second aspect , the driving means is a pressure-feeding pump that pumps the lubricating oil by driving and stops the pumping of the lubricating oil by stopping driving. The pump has a first oil chamber located on the forward movement side of the piston and a second oil chamber located on the backward movement side of the piston, which are partitioned by the piston in the cylinder chamber. A pipe communicating with the metering valve is connected, and a pipe communicating with the pressure feed pump is connected to the second oil chamber.

The invention described in claim 3 specifically shows the configuration of the cylinder pump and the drive means which are the constituent elements of the invention described in claim 1 or 2 , and according to this, the drive means is And a first pumping chamber located on the forward movement side of the piston, which is partitioned by the piston in the cylinder chamber, and is configured by a pumping pump that pumps the lubricating oil by driving and stops pumping the lubricating oil by stopping driving. And a second oil chamber located on the reverse movement side of the piston, pipes communicating with the respective metering valves are connected to the first oil chamber, and pipes communicating with the pressure pump are connected to the second oil chamber. It has the structure made.

  Therefore, the lubricant is pumped into the second oil chamber by driving the pressure pump, the piston is moved forward in the cylinder chamber to narrow the first oil chamber, and the lubricating oil having an operating pressure is applied to each metering valve from the first oil chamber. A certain amount of lubricating oil can be discharged from each metering valve.

  Then, by stopping the driving of the drive pump, the pumping of the lubricating oil to the second oil chamber is stopped, the pressure of the lubricating oil supplied from the first oil chamber to each metering valve is lowered below the operating pressure, and then the driving is performed. When the means is driven, lubricating oil having operating pressure can be provided again to each metering valve so that a certain amount of lubricating oil can be discharged.

According to a fourth aspect of the present invention, there is provided the centralized lubricating device according to the third aspect , wherein the centralized lubrication device is provided between the pressure feed pump and the cylinder pump, and is switched between the pressure feed pump and the first oil chamber, or between the pressure feed pump and the first pump. An upstream side switching valve that selects and communicates with any one of the two oil chambers, and is provided between the cylinder pump and each metering valve, and between the first oil chamber and each metering valve by the switching operation, Alternatively, it is branched at a midway position of a downstream switching valve that selects and communicates between the second oil chamber and each metering valve and a pipe that communicates between the downstream switching valve and each metering valve. A drain passage provided in the drain passage, and an on-off valve provided in the drain passage for opening or closing the drain passage by a switching operation. The control means controls the upstream side switching valve to control the pressure feed pump and the second oil chamber. Between the first oil chamber and each metering valve by controlling the downstream switching valve. Communicating between them, closing the drain passage by controlling the on-off valve, supplying lubricating oil into the second oil chamber by driving the pressure feed pump, and supplying lubricating oil having operating pressure from the first oil chamber to each metering valve The upstream switching valve is controlled to communicate between the pressure pump and the first oil chamber, the downstream switching valve is controlled to communicate between the second oil chamber and each metering valve, The drain passage is controlled so that the lubricating oil is supplied into the first oil chamber by driving the pressure pump, and the lubricating oil in the second oil chamber can be extracted from the drain passage.

According to the fourth aspect of the present invention, the upstream switching valve is controlled to communicate between the pressure pump and the second oil chamber, and the downstream switching valve is controlled to connect the first oil chamber and each metering valve. Communicating between them, closing the drain passage by controlling the on-off valve, supplying lubricating oil into the second oil chamber by driving the pressure feed pump, and supplying lubricating oil having operating pressure from the first oil chamber to each metering valve can do.

  Then, the upstream switching valve is controlled to communicate between the pressure feed pump and the first oil chamber, the downstream switching valve is controlled to communicate between the second oil chamber and each metering valve, and the open / close valve is controlled. Then, the drain passage is opened, and the lubricating oil can be supplied into the first oil chamber by driving the pressure feed pump, and the lubricating oil in the second oil chamber can be extracted from the drain passage.

According to the present invention, it is possible to obtain an accurate discharge amount of the lubricating oil discharged from each metering valve by one lubricating oil supply operation. Therefore, it is possible to quickly and accurately determine the leakage or supply failure of the lubricating oil, for example, by comparison with the previous use amount or comparison with a preset reference amount.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram for explaining the overall configuration of a centralized lubrication device 1 according to the present embodiment, FIG. 2 is a diagram for explaining input / output to / from the control means of the centralized lubrication device 1, and FIG. FIG. 4 is a diagram for explaining the operation of each part when the metering valve 3 is discharged, FIG. 4 is a diagram for explaining the operation of each part when lubricating oil is supplied to the cylinder pump 4, and FIG. FIG. 6 is a diagram for explaining the movement of the piston 13 when the piston 13 of the pump 4 is pressed, and FIG. 6 is a diagram for explaining the movement of the piston 13 when the pressure feed pump 2 is stopped and released.

  As shown in FIGS. 1 and 2, the centralized lubricating device 1 includes a pumping pump 2 as a driving unit that pumps the lubricating oil stored in the lubricating oil tank 6, and a lubricating oil having a preset operating pressure. , A metering valve 3 that discharges a certain amount of lubricating oil by receiving the supply, a cylinder pump 4 interposed between the pumping pump 2 and the metering valve 3, and a control means (control device) for controlling the centralized lubricating device 1 ) 5.

  The pressure pump 2 is connected to a power source with a relay switch (not shown) interposed therebetween, and the relay switch is controlled to open and close in accordance with a control signal from the control means 5 (see FIG. 2) to supply power. And is stopped when the supply of power is stopped. The pump 2 pumps up the lubricating oil from the lubricating oil tank 6 by driving, sucks it into the pump body from the suction port, and lubricates the lubricating oil at a preset pressure higher than the operating pressure of the metering valve from the discharge port of the pump body. It has the structure which pumps. Then, the pumping of the lubricating oil is stopped by stopping the driving, and the pressure of the lubricating oil on the discharge port side is made lower than the operating pressure by releasing the atmospheric pressure.

  Each metering valve 3 is attached to an oil supply location provided in the vicinity of each sliding portion (not shown) such as a machining center or a transfer machine, for example, and the discharged lubricating oil lubricates the sliding portion. It is like that.

  As is well known, the metering valve 3 has a free piston in the valve body. The free piston is moved forward by the supply of lubricating oil having an operating pressure, and a certain amount of lubricating oil stored in the valve body in advance is supplied. While discharging, the free piston is moved backward due to a decrease in the pressure of the supplied lubricating oil, and a certain amount of lubricating oil is stored in the valve body to prepare for the next discharge.

  In the present embodiment, the metering valve 3 includes a plurality of machine tools such as transfer machines arranged on a production line of a factory and each sliding portion of a work transfer device provided between the machine tools. A total of 337 pieces are provided at the oil supply points. The total discharge amount per one is set to 64.64 cc (one discharge per one metering valve is about 0.192 cc).

  The cylinder pump 4 has a cylinder body 11 in which a cylinder chamber 12 having a constant diameter and extending in the axial direction is formed, and reciprocates in the forward and backward directions along the axial direction in the cylinder chamber 12. It has a piston 13 that is freely accommodated and divides the inside of the cylinder chamber 12 into a first oil chamber 12a located on the forward side and a second oil chamber 12b located on the backward side.

  The cylinder body 11 is provided with a first through hole 11a communicating with the first oil chamber 12a in the cylinder chamber 12 and a second through hole 11b communicating with the second oil chamber 12b. An insertion hole 11c through which the rod 14 is inserted is formed at one end of the cylinder body 11 on the axially retreat side. The rod 14 is inserted into the insertion hole 11 c, has a configuration in which a proximal end side extends in the cylinder chamber 12 in the axial direction and is connected to the piston 13, a distal end side protrudes from the cylinder body 11, and is interlocked with the piston 13. . The communication hole 11 c is provided with a seal material (not shown) that prevents the lubricating oil in the cylinder chamber 12 from leaking from the space between the rod 14.

  The cylinder pump 4 is provided with an encoder (piston movement amount measuring means) 15 for measuring the movement amount of the piston 13 and detection switches SW1 and SW2 for detecting the forward end and the backward end of the piston 13. The encoder 15 is provided at one end of the cylinder body 11 on the axially retreat side, and has a configuration that outputs a pulse signal in accordance with the movement of the rod 14. The encoder 15 outputs a pulse (0.086 cc / pulse) every time the volume of the first oil chamber 12 a and the second oil chamber 12 b changes by 0.086 cc by the movement of the rod 14 (movement of the piston 13). Have The pulse signal output from the encoder 15 is input to the control means 5.

  The detection switches SW1 and SW2 are attached to positions near one end and the other end of the cylinder body 11, respectively, and when the piston 13 approaches a preset approach distance with respect to the detection switches SW1 and SW2, 13 is configured to change the signal from OFF to ON in response to a magnet (not shown) embedded in 13.

  And the centralized lubrication apparatus 1 has solenoid valves SOL1-SOL3. The solenoid valve (upstream side switching valve) SOL1 is provided between the pressure pump 2 and the cylinder pump 4, and is switched between the pressure pump 2 and the first oil chamber 12a or between the pressure pump 2 and the second oil pump 12 by a switching operation. One of the oil chambers 12b is selected and communicated.

  The input port of the solenoid valve SOL1 is connected to the pumping pump 2 via the pipe a1, and one of the two output ports is connected to the first oil chamber 12a of the cylinder pump 4 via the pipe a2. The other output port is connected to the second oil chamber 12b of the cylinder pump 4 via the pipe a3.

  Then, the switching operation of the electromagnetic valve SOL1 is performed according to the control signal from the control means 5, and either between the pressure feed pump 2 and the first oil chamber 12a or between the pressure feed pump 2 and the second oil chamber 12b. Either one is selected and communicated, and the lubricating oil pressure-fed from the pressure-feed pump 2 to the cylinder pump 4 is selectively switched and supplied to the first oil chamber 12a or the second oil chamber 12b of the cylinder pump 4. .

  The solenoid valve (downstream switching valve) SOL2 is provided between the cylinder pump 4 and each metering valve 3, and is switched between the first oil chamber 12a and each metering valve 3 or the second oil chamber by switching operation. 12b and each metering valve 3 are selected and communicated with each other.

  One input port of the solenoid valve SOL2 is connected to the first oil chamber 12a via a pipe b1, and the other input port is connected to the second oil chamber 12b via a pipe b2. The output port is connected to the distributor 7 through the pipe b3. The distributor 7 has a configuration in which the lubricating oil supplied through the pipe b <b> 3 is distributed and supplied to each metering valve 3.

  Then, switching control of the solenoid valve SOL2 is performed in accordance with a control signal from the control means 5, and either one between the first oil chamber 12a and the pipe b3 or between the second oil chamber 12b and the pipe b3. Is selected and communicated, and the lubricating oil in the first oil chamber 12a is supplied to the metering valve 3, or the lubricating oil in the second oil chamber 12b is returned from the drain passage b4 to the lubricating oil tank 6. .

  The pipes a2 and b1 are connected to each other and connected to the first through hole 11a, and the pipes a3 and b2 are connected to each other and connected to the second through hole 11b. The pipe b3 has one end connected to the output port of the electromagnetic valve SOL2, the other end connected to the distributor 7 of each metering valve 3, and communicates between the electromagnetic valve SOL2 and the distributor 7. A drain passage b4 is branched and provided in the middle position.

  The drain passage b <b> 4 communicates with the lubricating oil tank 6 and opens into the lubricating oil tank 6. An electromagnetic valve (open / close valve) SOL3 is provided in the middle of the drain passage b4. The electromagnetic valve SOL3 performs opening / closing control for opening and closing the drain passage b4 in response to a control signal from the control means 5, and when supplying the lubricating oil from the first oil chamber 12a to each metering valve 3, the drain passage b4 is opened. When closing and returning the lubricating oil from the second oil chamber 12b to the lubricating oil tank 6, the drain passage b4 is opened.

  The pipes a1 and b3 are provided with pressure sensors 8 and 9 for detecting the respective pipe pressures. The pressure sensor 8 detects the pressure on the upstream side of the cylinder pump 4, and the pressure sensor 9 detects the pressure on the downstream side of the cylinder pump 4. The pressure sensors 8 and 9 are connected to the control means 5 and change the signal from OFF to ON by detecting a pressure equal to or higher than a preset pressure.

  The control unit 5 includes a calculation unit, a storage unit, and the like. In the present embodiment, the control unit 5 includes a sequence program controller, a power supply circuit, a timer relay circuit, and the like in which a sequence program for controlling the centralized lubricating device 1 is installed. Are accommodated in a control panel (not shown). On the input side of the control means 5, an encoder 15, detection switches SW1 and SW2, and pressure sensors 8 and 9 are electrically connected, and on the output side, a pressure feed pump 2, solenoid valves SOL1 to SOL3, a display means 21, and an alarm. Means 22 are electrically connected. And it has the structure which controls each means, such as the pressure pump 2 connected to the output side, based on the input signal from the pressure sensors 8 and 9 connected to the input side.

  The control means 5 intermittently discharges a fixed amount of lubricating oil from each metering valve 3 to supply lubricating oil to each oiling location, and replenishes lubricating oil into the first oil chamber 12 a of the cylinder chamber 12. Replenishment operation processing, total discharge amount calculation processing for calculating the total discharge amount of lubricating oil discharged from each metering valve 3 by one lubricating oil supply operation processing, and lubricating oil leakage occurs in the middle of the lubricating oil supply path Lubricating oil leakage judgment processing for judging whether or not the lubricating oil is supplied, and lubricating oil supply failure judging processing for judging whether or not a poor supply of lubricating oil to the oil supply location has occurred.

Next, each process by the control means 5 will be described below.
(Lubricating oil supply operation processing)
The control means 5 performs the lubricating oil supply operation process by providing the preset operating conditions. In the present embodiment, the preset operation condition is set to be performed once every 30 times the machine tool is operated, but is not limited to this. For example, the rate is once every 30 minutes. May be set at time intervals so as to perform the lubricating oil supply operation.

  In the lubricating oil supply operation processing, the electromagnetic valve SOL1 is controlled to communicate between the pressure pump 2 and the second oil chamber 12b, and the electromagnetic valve SOL2 is controlled to connect between the first oil chamber 12a and each metering valve 3. Are communicated (see, for example, FIG. 3). Then, the pumping pump 2 is driven to feed the lubricating oil having the operating pressure of the metering valve 3 from the lubricating oil tank 6 to the second oil chamber 12b.

  The piston 13 in the cylinder chamber 12 is pushed forward by the lubricating oil pumped to the second oil chamber 12b, moves forward, reduces the volume of the first oil chamber 12a, and is stored in advance in the first oil chamber 12a. The oil is pushed out from the first oil chamber 12a.

  The lubricating oil pushed out from the first oil chamber 12a passes through the pipes b1 and b3 and is pumped to the distributor 7, distributed by the distributor 7, and pumped to each metering valve 3. Accordingly, lubricating oil having an operating pressure is supplied to each metering valve 3, and a certain amount of lubricating oil is discharged from each metering valve 3 and supplied to each oiling location. When lubricating oil is discharged from each metering valve 3, the pressure of the lubricating oil in the pipe b3 rises to a pressure higher than the operating pressure by shutting off the free piston in each metering valve 3.

  When the control means 5 receives from the pressure sensor 9 a signal for detecting that the pressure of the lubricating oil in the pipe b3 has risen to a pressure higher than the operating pressure by driving the pressure feed pump 2, it is set in advance after receiving the signal. The driving of the pumping pump 2 is continued until the operating time has elapsed, and the driving of the pumping pump 2 is stopped after the operating time has elapsed. The control means 5 is set in advance as an operation time by estimating the time from when the lubricating oil having an operating pressure is supplied to each metering valve 3 to when a certain amount of lubricating oil is discharged by each metering valve 3. ing.

  When the pumping of the lubricating oil from the pumping pump 2 to the second oil chamber 12b is stopped by stopping the driving of the pumping pump 2 and the pressure on the outlet side of the pumping pump 2 is released to the atmospheric pressure, the inside of the second oil chamber 12b The pressure is also reduced from the operating pressure to atmospheric pressure. Then, the pressure of the piston 13 is stopped according to the pressure drop in the second oil chamber 12b, the pressure of the lubricating oil in the first oil chamber 12a is also reduced to the atmospheric pressure, and each metering valve 3 from the first oil chamber 12a. The pressures in the pipes b1 and b3 that connect between the operation pressure also decrease from the operating pressure to the atmospheric pressure. Due to this pressure drop, each metering valve 3 stores a certain amount of lubricating oil in the valve body in preparation for the next discharge. Then, when the pressure feed pump 2 is driven and the lubricating oil having the operating pressure is supplied again, a certain amount of lubricating oil can be discharged.

  The control means 5 repeats the operation from the driving of the pumping pump 2 to the stop of driving as a single lubricating oil supply operation every time a preset operating condition is satisfied. By the above-described lubricating oil supply control, a certain amount of lubricating oil is intermittently discharged from each metering valve 3, and this lubricating oil is supplied to each oil supply location, and each sliding portion is lubricated.

(Supply operation processing)
Whenever the above-described lubricating oil supply operation is performed, the control unit 5 advances the piston 13 by a predetermined amount in the cylinder chamber 12, and eventually the piston 13 reaches the forward end when detected by the forward end detection switch SW1. And a replenishment operation process for replenishing lubricating oil into the first oil chamber 12a is executed.

  In the replenishment operation process, the electromagnetic valve SOL1 is controlled to communicate between the pressure pump 2 and the first oil chamber 12a, and the electromagnetic valve SOL2 is controlled to communicate between the second oil chamber 12b and each metering valve 3. Let Then, the solenoid valve SOL3 is further controlled to open the drain passage b4 so that the second oil chamber 12b communicates with the lubricating oil tank 6 (see, for example, FIG. 4).

  After switching these solenoid valves SOL1 to SOL3, the pressure feed pump 2 is driven to feed the lubricating oil in the lubricating oil tank 6 to the first oil chamber 12a, and the piston 13 in the cylinder chamber 12 is pressed by the lubricating oil. And move backward. Due to the backward movement of the piston 13, the volume of the first oil chamber 12a is expanded to replenish the lubricating oil into the first oil chamber 12a, and the volume of the second oil chamber 12b is decreased to accumulate in the second oil chamber 12b. The lubricating oil discharged from the second oil chamber 12b is returned to the lubricating oil tank 6 through the pipes b2, b3 and the drain passage b4.

  When the piston 13 reaches the backward end in the cylinder chamber 12 and is detected by the reverse end detection switch SW2, the control means 5 stops the driving of the pressure feed pump 2. Then, the electromagnetic valve SOL1 is controlled to communicate between the pressure feed pump 2 and the second oil chamber 12b, the electromagnetic valve SOL2 is controlled to communicate between the first oil chamber 12a and each metering valve 3, and Then, the solenoid valve SOL3 is controlled to close the drain passage b4 to prepare for the above-described lubricating oil supply operation processing (see, for example, FIG. 3).

  With the above-described replenishment operation process, for example, when the amount of lubricating oil stored in the first oil chamber 12a is reduced by the lubricant supply control, the lubricating oil can be replenished in the first oil chamber 12a.

(Total discharge amount calculation process)
The control means 5 performs a total discharge amount calculation process for calculating a total discharge amount of the lubricating oil discharged from each metering valve 3 every time one lubricating oil supply operation process is completed. That is, the control means 5 has a function as a total discharge amount calculation means. In the total discharge amount calculation process, as shown in FIG. 5, the forward movement amount of the piston 13 when the pumping pump 2 is driven by the lubricating oil supply operation process, and the pumping pump 2 stops driving as shown in FIG. Then, the amount of backward movement of the piston 13 is measured by the encoder 15.

  Then, by subtracting the backward movement amount from the measured forward movement amount, the actual movement amount that is the actual movement amount of the piston is calculated, and the total amount of lubricating oil in one lubricating oil supply operation is calculated based on the actual movement amount. The discharge amount is calculated.

  In the present embodiment, the forward movement amount is the number of pulses output from the encoder 15 between the start of driving of the pumping pump 2 and the stop of driving, and the backward movement amount is the first oil from the stop of driving of the pumping pump 2. This is the number of pulses output from the encoder 15 until the pressure of the lubricating oil in the chamber 12a and the second oil chamber 12b drops below a preset pressure.

  The pipes b1 and b3 extending from the cylinder pump 4 to the respective metering valves 3 are expanded by the increase in the pressure of the lubricating oil due to the driving of the pumping pump 2, and contracted by the decrease in the pressure of the lubricating oil due to the stop of the driving of the pumping pump 2. Return to Therefore, as shown in FIG. 6, the expanded lubricating oil returns from the pipes b1 and b3 into the first oil chamber 12a, and the piston 13 is moved in the backward direction by that amount.

  Accordingly, the actual movement amount is obtained by subtracting the backward movement amount, which is the expansion amount of the pipes b1 and b3, from the forward movement amount of the piston 13, and the volume calculated based on the actual movement amount is actually obtained from each metering valve 3. The total discharged amount can be set.

  Since the supply amount of the lubricating oil is calculated by measuring the movement amount of the piston 13 in the cylinder chamber 12, an accurate total discharge amount of the lubricating oil in one lubricating oil supply operation process can be obtained. it can.

  The total discharge amount calculated by the total discharge amount calculation process is stored in the storage unit of the control unit 5 together with data such as date and time. The total discharge amount is displayed by the display means 21. The display means 21 is provided on a panel surface or the like of a control panel (not shown) so that an operator can easily see it.

(Lubricating oil leak judgment processing)
The control means 5 performs a lubricating oil leakage judgment process every time one lubricating oil supply operation process is completed. In the lubricating oil leakage determination process, when one lubricating oil supply operation process is completed and the total discharge amount is calculated by the total discharge amount calculation process, the calculated total discharge amount is set as the current total discharge amount, and the storage unit Read the previous total discharge amount stored in the previous total discharge amount, compare the current total discharge amount with the previous total discharge amount, and whether the current total discharge amount is greater than the previous total discharge amount (Some judgment means).

  When the current total discharge amount is larger than the previous total discharge amount, it is determined whether or not the difference between the current total discharge amount and the previous total discharge amount is larger than a preset threshold value (threshold determination means). ).

  Here, when the difference between the current total discharge amount and the previous total discharge amount is larger than the threshold value, it is determined that a lubricating oil leak has occurred. On the other hand, when the current total discharge amount is less than or equal to the previous total discharge amount, or when the current total discharge amount is larger but the difference between the current total discharge amount and the previous total discharge amount is less than or equal to the threshold value, lubricating oil leakage occurs. (Lubricating oil leakage judging means).

  For example, when there is no leakage of lubricating oil, only a fixed amount of lubricating oil is discharged from each metering valve 3 each time the lubricating oil supply operation process is performed, and the total discharge amount is almost the same each time. Value.

  However, when a lubricating oil leak occurs in the course from the first oil chamber 12a to each metering valve 3, the current total discharge amount is the sum of the total discharge amount and the leak amount. Also increases by the amount of leakage.

  Accordingly, it is possible to quickly and accurately determine whether or not a lubricant leak has occurred. For example, a minute leak of lubricant leaking from looseness of the connecting parts such as the pipes b1 and b3, the distributor 7 and the metering valves 3 In addition, it is possible to detect a minute leakage of lubricating oil due to pinholes formed in the pipes b1 and b3 due to corrosion caused by cutting residue accumulated on the pipes b1 and b3. Therefore, the lubricating oil leakage can be detected at an early stage, and the conventional dripping of the lubricating oil can be prevented.

  And when the lubricating oil leaks, the exact amount of leakage can be obtained. Therefore, the cause of the lubricating oil leakage can be specified to some extent based on the leakage amount, and quick repair is possible.

  If it is determined by the lubricating oil leakage determination process that a lubricating oil leak has occurred, an alarm is issued by the alarm means 22. The alarm means 22 is provided on the surface of the control panel (not shown), etc., and emits an alarm when a red light illuminates / flashes and an alarm sound is generated, so that an operator can easily recognize the occurrence of a lubricating oil leak. It can be done. Here, it may be displayed on the display means 21 that the lubricating oil leakage has occurred.

(Lubricant supply failure judgment process)
Further, the control means 5 performs a lubricating oil supply failure determination process every time one lubricating oil supply operation process is completed. In the lubricating oil supply failure determination process, when one lubricating oil supply operation process is completed and the total discharge amount is calculated by the total discharge amount calculation process, the calculated total discharge amount is set as the current total discharge amount and stored. The previous total discharge amount stored in the means is read out as the previous total discharge amount, and the current total discharge amount and the previous total discharge amount are compared to determine a certain amount (some determination means).

  When the current total discharge amount is smaller than the previous total discharge amount, it is determined whether or not the difference between the current total discharge amount and the previous total discharge amount is larger than a preset threshold value (threshold determination means). ).

  Here, when the difference between the current total discharge amount and the previous total discharge amount is larger than a preset threshold value, it is determined that a lubricant supply failure has occurred. On the other hand, when the current total discharge amount is larger than the previous total discharge amount, or when the current total discharge amount is smaller than the previous total discharge amount but the difference between the current total discharge amount and the previous total discharge amount is equal to or less than the threshold value, It is determined that there is no supply failure of the lubricant (lubricant supply failure determination means).

  For example, when the pipes b1 and b3 are not clogged and each metering valve 3 is operating normally, a certain amount of lubricating oil is discharged from each metering valve 3, and the total discharge amount Becomes almost the same value every time. Therefore, it is possible to determine that there is no supply failure of the lubricating oil and that the lubricating oil is normally supplied to each oil supply location.

  However, when the pipes b1 and b3 are clogged, or when the metering valve 3 fails, a fixed amount of lubricating oil cannot be discharged from all the metering valves 3, and each sliding part is appropriately When the lubrication is impossible, the current total discharge amount is reduced from the previous total discharge amount by the amount of clogging or the discharge amount of the failed metering valve 3.

  Therefore, it is possible to quickly and accurately determine the occurrence of poor lubrication oil supply due to clogging of piping or failure of the metering valve 3.

  Further, for example, in addition to complete clogging that blocks the pipes b1 and b3, incomplete clogging to the extent that the pipes b1 and b3 are narrowed can be detected, and the free piston of the metering valve 3 is completely fixed. Thus, in addition to a failure in which no lubricating oil can be discharged, it is possible to detect a supply failure due to a failure in which the amount of lubrication discharged with a dull operation of the free piston is less than a certain amount. Therefore, the supply failure of the lubricating oil can be detected at an early stage, and abnormal wear of each sliding portion can be prevented.

  Even when the supply failure of the lubricating oil occurs, an accurate total discharge amount can be obtained. Accordingly, the cause of the supply failure can be specified to some extent based on the decrease amount of the total discharge amount, and a prompt response can be made.

  If it is determined by the lubricating oil supply failure determination process that a lubricating oil supply failure has occurred, an alarm is issued by the alarm means 22. The alarm means 22 is provided on the surface of a control panel (not shown), etc., and an alarm is generated when a red light is lit or blinks or an alarm sound is generated, so that an operator can easily generate a lubricant supply failure. Can be recognized. In addition, you may make it display on the display means 21 that the supply failure of lubricating oil generate | occur | produced here.

  According to the centralized lubricating device 1 having the above-described configuration, a certain amount of lubricating oil can be intermittently discharged from each metering valve 3 to supply each oil supply location, and each sliding portion can be lubricated. And the total discharge amount of the lubricating oil discharged from each metering valve 3 can be calculated by one lubricating oil supply operation process.

  Then, by comparing with the previous total discharge amount, whether or not there is a leakage of the lubricating oil in the middle of the path from the first oil chamber 12a of the cylinder pump 4 constituting the lubricating oil supply system to each metering valve 3 Can be accurately determined, and when the leakage of the lubricating oil has occurred, the amount of leakage can be accurately grasped.

  In addition, by comparing the current total discharge amount with the previous total discharge amount, it is accurately determined whether or not a lubricating oil supply failure has occurred due to clogging of the pipes b1 and b3, failure of each metering valve 3, or the like. If the supply failure of the lubricating oil has occurred, it is possible to accurately grasp the amount of decrease in the lubricating oil.

  Furthermore, according to the above configuration, the number of parts is small, a simple structure can be obtained, and the manufacturing can be performed at low cost. Then, it is only necessary to intervene between the conventional pump and the metering valve, it can be retrofitted, and the conventional apparatus can be easily modified and configured.

  In addition, this invention is not limited to the above-mentioned embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, in the above-described embodiment, the case where the encoder 15 has a configuration that outputs a pulse signal according to the movement of the rod 14 has been described as an example. However, the position of the piston 13 is directly detected and the piston 13 is detected. A device that outputs a pulse signal in accordance with the movement of may be used.

  In the above-described embodiment, the lubricating oil is supplied from the first oil chamber 12a to each metering valve 3 in the lubricating oil supply operation processing, and the lubricating oil is supplied to the first oil chamber 12a in the replenishing operation processing. However, the replenishment operation process may be omitted. For example, in the lubricating oil supply operation process, when the piston 13 moves to the forward end, the electromagnetic valve SOL1 is controlled to connect the pressure feed pump 2 and the first oil chamber 12a, and the electromagnetic valve SOL2 is controlled to perform the second operation. Lubricating oil may be supplied from the second oil chamber 12b to each metering valve 3 by driving the pressure feed pump 2 by communicating between the oil chamber 12b and each metering valve 3. In this case, the electromagnetic valve SOL3 can be kept closed, or the electromagnetic valve SOL3 and the drain passage b4 can be omitted.

It is a figure explaining the whole structure of the centralized lubrication apparatus concerning this Embodiment. It is a figure explaining the input-output to the control means of a centralized control apparatus. It is a figure explaining operation | movement of each part at the time of discharge. It is a figure explaining operation of each part at the time of replenishment of lubricating oil. It is a figure explaining the movement of a piston when the piston of a cylinder pump is pressed by the drive of a pressure pump. It is a figure explaining a motion of a piston when the drive of a pressure pump is stopped and pressure release is carried out. It is a figure explaining a prior art.

Explanation of symbols

1 Centralized lubrication device 2 Pressure feed pump (drive means)
3 Metering valve 4 Cylinder pump 5 Control means 12 Cylinder chamber 12a First oil chamber 12b Second oil chamber 13 Piston 15 Encoder (piston movement amount measuring means)
a1, a2, a3 Piping b1, b2, b3 Piping b4 Drain passage SOL1 Solenoid valve (upstream switching valve)
SOL2 solenoid valve (downstream switching valve)
SOL3 solenoid valve (open / close valve)

Claims (4)

A plurality of metering valves that perform an operation of discharging a certain amount of lubricating oil by receiving a supply of lubricating oil having a preset operating pressure;
A piston is reciprocally moved in a cylinder chamber communicating with each metering valve via a pipe and storing lubricant, and the lubricant in the cylinder chamber is supplied to each metering valve by the forward movement of the piston. A cylinder pump;
The piston of the cylinder pump is moved forward by driving to increase the pressure of the lubricating oil supplied to each metering valve to the operating pressure, while the pressure of the lubricating oil supplied to each metering valve by driving is stopped from the operating pressure. Driving means for reducing
Control for controlling the discharge of a constant amount of lubricating oil from each metering valve by repeatedly operating the driving means and stopping the driving based on a preset condition as a single lubricating oil supply operation. Means,
A piston movement amount measuring means for measuring a forward movement amount of the piston by driving of the driving means and a backward movement amount of the piston by stopping driving of the driving means;
By subtracting the backward movement amount from the forward movement amount of the piston measured by the piston movement amount measuring means, the actual movement amount of the piston is calculated. Based on the actual movement amount, the one lubrication oil supply operation causes the possess a total discharge amount calculation means for calculating the total discharge amount of lubricating oil discharged from the metered valve,
Storage means for storing the total discharge amount calculated by the total discharge amount calculation means;
When the total discharge amount is calculated by the total discharge amount calculating unit, the calculated total discharge amount is set as the current total discharge amount, and the previous total discharge amount stored in the storage unit is set as the previous total discharge amount, Some determination means for comparing the current total discharge amount and the previous total discharge amount to determine a certain amount;
When the current determining unit determines that the current total discharge amount is larger than the previous total discharge amount, the difference between the current total discharge amount and the previous total discharge amount is greater than a preset threshold value. Threshold judgment means for judging whether or not,
When the threshold value determining means determines that the difference between the current total discharge amount and the previous total discharge amount is larger than a preset threshold value, it is determined that a lubricating oil leak has occurred, and the somewhat determining means When the current total discharge amount is determined to be less than or equal to the previous total discharge amount or when the difference between the current total discharge amount and the previous total discharge amount is determined to be equal to or less than the threshold value by the threshold determination unit. A centralized lubricating device having a lubricating oil leakage determining means for determining that no oil leakage has occurred . A plurality of metering valves that perform an operation of discharging a certain amount of lubricating oil by receiving a supply of lubricating oil having a preset operating pressure;
A piston is reciprocally moved in a cylinder chamber communicating with each metering valve via a pipe and storing lubricant, and the lubricant in the cylinder chamber is supplied to each metering valve by the forward movement of the piston. A cylinder pump;
The piston of the cylinder pump is moved forward by driving to increase the pressure of the lubricating oil supplied to each metering valve to the operating pressure, while the pressure of the lubricating oil supplied to each metering valve by driving is stopped from the operating pressure. Driving means for reducing
Control for controlling the discharge of a constant amount of lubricating oil from each metering valve by repeatedly operating the driving means and stopping the driving based on a preset condition as a single lubricating oil supply operation. Means,
A piston movement amount measuring means for measuring a forward movement amount of the piston by driving of the driving means and a backward movement amount of the piston by stopping driving of the driving means;
By subtracting the backward movement amount from the forward movement amount of the piston measured by the piston movement amount measuring means, the actual movement amount of the piston is calculated. Based on the actual movement amount, the one lubrication oil supply operation causes the A total discharge amount calculating means for calculating the total discharge amount of the lubricating oil discharged from each metering valve,
Storage means for storing the total discharge amount calculated by the total discharge amount calculation means;
When the total discharge amount is calculated by the total discharge amount calculating unit, the calculated total discharge amount is set as the current total discharge amount, and the previous total discharge amount stored in the storage unit is set as the previous total discharge amount, Some determination means for comparing the current total discharge amount and the previous total discharge amount to determine a certain amount;
When the current determining unit determines that the current total discharge amount is smaller than the previous total discharge amount, the difference between the current total discharge amount and the previous total discharge amount is greater than a preset threshold value. Threshold judgment means for judging whether or not,
When it is determined by the threshold determination means that the difference between the current total discharge amount and the previous total discharge amount is larger than a preset threshold value, it is determined that a lubricant supply failure has occurred, When the determination unit determines that the current total discharge amount is greater than or equal to the previous total discharge amount, or the threshold determination unit determines that the difference between the current total discharge amount and the previous total discharge amount is equal to or less than the threshold value And a lubricating oil supply failure judging means for judging that no lubricating oil supply failure has occurred. The drive means is a pump that pumps the lubricating oil by driving and stops the pumping of the lubricating oil by stopping driving;
The cylinder pump has a first oil chamber located on the forward movement side of the piston and a second oil chamber located on the backward movement side of the piston, which is partitioned by the piston in the cylinder chamber, 3. The concentration according to claim 1, wherein a pipe communicating with each of the metering valves is connected to the first oil chamber, and a pipe communicating with the pressure pump is connected to the second oil chamber. Lubrication device. It is provided between the pressure feed pump and the cylinder pump, and selects one of the pressure feed pump and the first oil chamber or the pressure feed pump and the second oil chamber by a switching operation. An upstream switching valve for communication;
Provided between the cylinder pump and each metering valve, either by switching operation, between the first oil chamber and each metering valve, or between the second oil chamber and each metering valve A downstream switching valve for selecting one to communicate with, and
A drain passage provided by branching in the middle of a pipe communicating between the downstream switching valve and each metering valve;
An open / close valve provided in the drain passage and opening or closing the drain passage by a switching operation;
The control means controls the upstream side switching valve to communicate between the pressure feed pump and the second oil chamber, and controls the downstream side switching valve to control the first oil chamber and each metering valve. The drain passage is closed by controlling the on-off valve, the lubricating oil is supplied into the second oil chamber by driving the pressure feed pump, and the operating pressure is applied from the first oil chamber to the metering valves. The upstream switching valve is controlled to communicate between the pressure pump and the first oil chamber, and the downstream switching valve is controlled to control the second oil chamber Communicating with a metering valve, controlling the on-off valve to open the drain passage, and supplying the lubricating oil into the first oil chamber by driving the pressure feed pump and supplying the lubricating oil in the second oil chamber condensing according to claim 3, characterized in that to allow extraction from the drain passage Lubricating device.

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