Vertical milling equipment and determination method

Abstract

To provide vertical milling equipment which enables determination of abnormality of circulating supply of lubrication oil.SOLUTION: Vertical milling equipment is provided, which circulating supplies lubrication oil OL lubricating a bearing 51 rotationally supporting a milling roller 100 and includes: an oil tank 11 in which the lubrication oil OL is stored; a bearing housing 50 which is supplied with the lubrication oil OL lubricating the bearing 51 and from which the lubrication oil OL is discharged; an ongoing route for flowing the lubrication oil OL from the oil tank 11 into the bearing housing 50; an ongoing route detection part 58 for detecting a supply amount of the lubrication oil flowing in the ongoing route; a return route for flowing the lubrication oil OL from the bearing housing 50 into the oil tank 11; a return route detection part 59 for detecting a return amount of the lubrication oil OL flowing in the return route; and a control part 70 determining the presence / absence of abnormality in circulation and supply of the lubrication oil based on the supply amount of the lubrication oil OL detected by the ongoing route detection part 58 and the return amount of the lubrication oil OL detected by the return route detection part 59.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vertical mill apparatus and a determination method. [Background technology]

[0002] A vertical mill is a device in which a crushing roller rotatably supported by bearings is placed on a rotary table, and the raw material is crushed by being caught between the rotary table and the crushing roller. Lubricating oil is circulated and supplied to the bearing housing that holds the bearing of the crushing roller.

[0003] Patent Document 1 discloses a circulating oil supply unit that circulates lubricating oil to the bearing housing of a crushing roller, making it easy to replace the lubricating oil.

[0004] The circulating oil supply unit in Patent Document 1 is provided with a level meter that detects the oil level in a lubricating oil bath for immersing the bearings of the crushing rollers in lubricating oil, and supplies lubricating oil to the lubricating oil bath according to the oil level detected by this level meter. Therefore, the circulating oil supply unit in Patent Document 1 can store an appropriate amount of lubricating oil in the lubricating oil bath. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 60-104249 Summary of the Invention [Problem to be solved by the invention]

[0006] When the grinding roller is operated continuously for a long period of time, a problem such as a leakage of lubricating oil may occur at some point in the circulation supply path. Even if the oil level is detected using a level meter as in Patent Document 1, it is not possible to detect a problem in the circulation supply path. This is because, according to Patent Document 1, even if a leakage occurs, an amount of lubricating oil sufficient to compensate for the leakage will be supplied. In view of the above, an object of the present invention is to provide a vertical mill apparatus that can determine abnormalities in the circulating supply of lubricating oil. [Means for solving the problem]

[0007] The vertical mill apparatus of the present invention comprises: A vertical mill device that circulates and supplies lubricating oil to lubricate bearings that rotatably support grinding rollers, An oil tank that stores lubricating oil, a bearing housing to which lubricating oil for lubricating the bearing is supplied and discharged; An outward path that carries lubricating oil from the oil tank to the bearing housing; an outward path detection unit that detects the amount of lubricating oil flowing through the outward path; A return path that carries lubricating oil from the bearing housing to the oil tank. a return path detection unit that detects the return amount of lubricating oil flowing through the return path; and a control unit that determines whether or not an abnormality has occurred in the circulating supply of lubricating oil based on the amount of lubricating oil supplied detected by the forward detection unit and the amount of lubricating oil returned detected by the return detection unit.

[0008] a supply amount adjusting unit that adjusts the amount of lubricating oil supplied; It is preferable to include a control unit that controls the supply amount adjustment unit based on the amount of lubricant oil supplied detected by the forward path detection unit and the amount of lubricant oil returned detected by the backward path detection unit.

[0009] The control unit When the return amount is greater than the supply amount and the difference between the return amount and the supply amount is greater than a first threshold, it is preferable to control the supply amount adjusting unit so as to increase the supply amount.

[0010] The control unit When the return amount is smaller than the supply amount and the difference between the return amount and the supply amount is larger than a second threshold value, it is preferable to control the supply amount adjusting unit so as to reduce the supply amount.

[0011] an air supply / discharge path for supplying or discharging air to the bearing housing; a supply / discharge path detection unit that detects the flow rate of the lubricating oil when the lubricating oil flows through the supply / discharge path, The control unit When the supply / discharge path detection unit detects a flow rate of lubricating oil, it is determined that an abnormality has occurred in the return path, When the flow rate of the lubricating oil is not detected by the supply / discharge path detection unit, it is preferable to determine that leakage of the lubricating oil from the bearing housing has occurred.

[0012] A return oil temperature detection unit is provided to detect the return oil temperature of the lubricating oil circulating in the return path, The control unit When the flow rate of the lubricating oil is detected by the supply / discharge path detection unit, If the return oil temperature is above the lower limit temperature, it is determined that a blockage has occurred on the return path. It is preferable to determine that an abnormality in the viscosity of the lubricating oil has occurred when the return oil temperature is lower than the lower limit temperature.

[0013] The vertical mill apparatus of the present invention comprises: A vertical mill device that circulates and supplies lubricating oil to lubricate bearings that rotatably support grinding rollers, An oil tank that stores lubricating oil, a bearing housing to which lubricating oil for lubricating the bearing is supplied and discharged; An outward path that carries lubricating oil from the oil tank to the bearing housing; A return path that carries lubricating oil from the bearing housing to the oil tank. a return oil temperature detection unit that detects the return oil temperature of the lubricating oil circulating in the return path; an air supply / discharge path for supplying or discharging air to the bearing housing; a supply / discharge path detection unit that detects the flow rate of the lubricating oil when the lubricating oil flows through the supply / discharge path; The supply and discharge path detection unit detects the flow rate of the lubricating oil, and if the return oil temperature is equal to or higher than the lower limit temperature, the control unit determines that an abnormality has occurred in the return path.

[0014] The vertical mill apparatus of the present invention comprises: A vertical mill device that circulates and supplies lubricating oil to lubricate bearings that rotatably support grinding rollers, An oil tank that stores lubricating oil, a bearing housing to which lubricating oil for lubricating the bearing is supplied and discharged; An outward path that carries lubricating oil from the oil tank to the bearing housing; A return path that carries lubricating oil from the bearing housing to the oil tank. a return temperature detection unit that detects the return temperature of the lubricating oil circulating in the return path; The control unit determines that a bearing abnormality has occurred when the return oil temperature is higher than the upper limit temperature.

[0015] a supply amount adjusting unit that adjusts the amount of lubricating oil flowing through the forward path; The control unit When it is determined that a bearing abnormality has occurred, it is preferable to issue a bearing abnormality notification and control the supply amount adjuster so as to increase the supply amount.

[0016] The determination method of the present invention comprises: A method for determining whether or not an abnormality has occurred in a vertical mill apparatus that circulates lubricating oil from an oil tank to a bearing housing through which the lubricating oil is supplied and discharged to lubricate bearings that rotatably support grinding rollers, comprising: The presence or absence of an abnormality in the circulation supply of lubricating oil is determined based on the amount of lubricating oil supplied from the oil tank to the bearing housing and the amount of lubricating oil returned from the bearing housing to the oil tank. [Effects of the Invention]

[0017] According to the vertical mill apparatus of the present invention, abnormalities in the circulating supply of lubricating oil can be determined. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a schematic diagram showing a circulating supply to a bearing housing in a vertical mill apparatus according to an embodiment of the present invention. [Figure 2] 1 is a diagram illustrating a schematic hardware configuration of a control device according to an embodiment of the present invention. [Figure 3] FIG. 4 is a diagram illustrating a control procedure performed by the control device. [Figure 4] FIG. 10 is a diagram showing a control procedure when controlling based on the measurement results of the flow rate sensor. [Figure 5] FIG. 10 is a diagram illustrating a control procedure when an overflow is determined. [Figure 6] FIG. 10 is a diagram showing a control procedure for determining whether the return oil temperature is an appropriate temperature. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. [Vertical mill equipment 1: See Figure 1] The vertical mill 1 of this embodiment is an apparatus in which a crushing roller 100 rotatably supported by a bearing is placed on a turntable 200, and raw material RM as a processing object is sandwiched between the turntable 200 and the crushing roller 100, thereby crushing the raw material RM. A bearing housing 50 that houses a bearing 51 that rotatably supports the crushing roller 100 is supplied with a circulating lubricating oil OL. This vertical mill 1 can respond to abnormalities in the circulating supply of lubricating oil.

[0020] The vertical mill apparatus 1 includes a circulating oil supply unit 10 that circulates and supplies lubricating oil OL to a bearing housing 50, the bearing housing 50 accommodating bearings 51 that rotatably support a crushing roller 100, a control device 70 as a control unit that controls the operation of the vertical mill apparatus 1, the crushing roller 100, and a rotary table 200. The outline arrow in Fig. 1 indicates the direction in which the lubricating oil OL flows.

[0021] [Circulating oil supply unit 10: See Figure 1] 1, the circulating oil supply unit 10 is a unit that circulates and supplies lubricating oil OL to the bearing housing 50 of the crusher roller 100. The circulating oil supply unit 10 includes an oil tank 11 that stores the lubricating oil OL, an oil supply line 20 that supplies the lubricating oil OL stored in the oil tank 11 to the bearing housing 50, an oil return line 30 that flows the lubricating oil OL discharged from the bearing housing 50 back to the oil tank 11, and a bypass line 40 that branches off from the oil supply line 20 and connects to the oil return line 30.

[0022] [Oil tank 11: See Figure 1] 1, the oil tank 11 is provided with an oil tank thermocouple 12 as a temperature detector that detects the storage temperature OT of the lubricating oil OL stored in the oil tank 11, and a heater 13 that heats the lubricating oil OL stored in the oil tank 11. The heater 13 is, for example, a throw-in heater.

[0023] [Oil supply line 20: See Figure 1] As shown in FIG. 1, an oil supply line 20 that supplies lubricating oil OL stored in an oil tank 11 to a bearing housing 50 is provided with, in order from the upstream side, a pump 21 that is driven to rotate by a motor 22, a cooler 23 that cools the lubricating oil OL flowing through the oil supply line 20, an electromagnetic proportional flow control valve 24 as a supply amount adjustment unit that adjusts the amount of lubricating oil OL supplied to the bearing housing 50, and an oil supply thermocouple 25 as an oil supply temperature detection unit that detects the temperature of the lubricating oil OL flowing through the oil supply line 20.

[0024] An upstream end 20U of the oil supply line 20 is immersed in the lubricating oil OL stored in the oil tank 11. The lubricating oil OL is sucked from the upstream end 20U of the oil supply line 20 by a pump 21 provided downstream of the upstream end 20U of the oil supply line 20, flows through the oil supply line 20 and the oil supply piping 54, and is supplied to the bearing housing 50.

[0025] The pump 21 receives rotational drive from the motor 22, which rotates at a constant rotation speed, to suck up the lubricating oil OL from the oil tank 11, circulate the lubricating oil OL through the oil supply line 20, and supply it to the bearing housing 50.

[0026] The cooler 23 performs cooling by, for example, circulating a cooling fluid inside a coiled pipe provided inside the cooler 23 and exchanging heat with the lubricating oil OL circulating outside the coiled pipe. The cooling fluid is, for example, water.

[0027] The electromagnetic proportional flow control valve 24 is a control valve that can continuously adjust the supply amount of lubricating oil OL flowing through the oil supply line 20. The electromagnetic proportional flow control valve 24 is controlled by a control device 70.

[0028] The oil supply thermocouple 25 measures the temperature of the lubricating oil OL flowing through the oil supply line 20. The oil supply temperature ST of the lubricating oil OL measured by the oil supply thermocouple 25 is acquired by the control device .

[0029] [Oil return line 30: See Figure 1] 1, the oil return line 30, which flows the lubricating oil OL discharged from the bearing housing 50 to the oil tank 11, is provided with, in order from the upstream side, an oil return thermocouple 31 serving as an oil return temperature detector that detects the temperature of the lubricating oil OL flowing through the oil return line 30, a magnetic separator 32 that magnetically attracts iron powder contained in the lubricating oil OL discharged from the bearing housing 50, and a jet pump 33 that generates negative pressure to suck in the lubricating oil OL accumulated in the bearing housing 50. The jet pump 33 will be described in detail in the description of the bypass line 40.

[0030] An upstream end 30U of the oil return line 30 is connected to an oil return pipe 55 through which the lubricating oil OL discharged from the bearing housing 50 flows. The downstream end 30D of the oil return line 30 is located inside the oil tank 11. The lubricating oil OL flows through the oil return piping 55, then passes through the upstream end 30U, and then flows through the oil return line 30, then passes through the downstream end 30D and is returned to the oil tank 11.

[0031] The oil return thermocouple 31 measures the temperature of the lubricating oil OL flowing through the oil return line 30. The temperature of the lubricating oil OL discharged from the bearing housing 50, flowing through the oil return line 30, and returned to the oil tank 11 is referred to as the oil return temperature RT. The oil return temperature RT of the lubricating oil OL measured by the oil return thermocouple 31 is acquired by the control device 70.

[0032] When the bearings 51 housed in the bearing housing 50 are used for a long period of time, the bearings 51 wear and generate iron powder, which may be contained in the lubricating oil OL discharged from the bearing housing 50. The magnetic separator 32 magnetically attracts the iron powder contained in the lubricating oil OL discharged from the bearing housing 50, thereby removing the iron powder from the lubricating oil OL that is returned to the oil tank 11.

[0033] [Bypass line 40: See Figure 1] As shown in FIG. 1, a bypass line 40 branching off from the oil supply line 20 and connected to the oil return line 30 is provided with a bypass valve 41 for adjusting the flow rate of the lubricating oil OL flowing through the bypass line 40.

[0034] The bypass line 40 branches off from the oil supply line 20 between the pump 21 and the cooler 23, and is connected to the jet pump 33 of the oil return line 30. A portion of the lubricating oil OL sucked up by the pump 21 of the oil supply line 20 flows through the bypass line 40 and returns to the oil tank 11 via the oil return line 30. The bypass valve 41 is a manual valve, and the opening degree of the bypass valve 41 is fixed.

[0035] When the lubricating oil OL flows through the bypass line 40 and then passes through the jet pump 33, negative pressure is created in the oil return line 30 around the jet pump 33, and a force acts on the tip 55A of the oil return piping 55 connected to the oil return line 30 to suck in the lubricating oil OL stored in the bearing housing 50. The pump 21 sucks in the lubricating oil OL, and some of the lubricating oil OL flows through the bypass line 40 and continuously passes through the jet pump 33, so the oil return line 30 around the jet pump 33 is continuously under negative pressure. The jet pump 33 continuously creates negative pressure in the oil return line 30 around the jet pump 33, so the lubricating oil OL stored in the bearing housing 50 is continuously sucked in by the oil return piping 55, and the lubricating oil OL can be continuously returned to the oil tank 11.

[0036] [Crushing roller 100: see Figure 1] As shown in FIG. 1, the crushing roller 100 is disposed on a rotary table 200 and rotates together with the rotation of the rotary table 200. The crushing roller 100 is composed of a roller 101, a bearing 51 that rotatably supports the roller 101, a roller shaft 52 on which the bearing 51 is held, a bearing housing 50 that stores lubricating oil OL for lubricating the bearing 51, an air vent pipe 53 that takes in air into the bearing housing 50 or expels air from the bearing housing 50, an oil supply pipe 54 that supplies the lubricating oil OL to the bearing housing 50, and an oil return pipe 55 that discharges the lubricating oil OL from the bearing housing 50 and flows it to the oil tank 11 of the circulating oil supply unit 10.

[0037] The bearing housing 50 is fastened and fixed to the roller 101 and rotates together with the roller 101. An oil seal 60 is attached to the bearing housing 50 which rotates together with the roller 101, sealing between the bearing housing 50 and the roller shaft 52.

[0038] The air vent pipe 53, the oil supply pipe 54, and the oil return pipe 55 are provided so as to penetrate the roller shaft 52 in the axial direction of the roller shaft 52.

[0039] Air vent piping 53, which serves as an air supply / discharge path for supplying or discharging air to or from bearing housing 50, has a tip 53A connected to the interior of bearing housing 50. Air vent piping 53 is also provided with an overflow flow rate sensor 56, which serves as an air supply / discharge path detector that detects the overflow flow rate when lubricating oil OL overflows from bearing housing 50, and an air breather 57, which is located rearward of the overflow flow rate sensor 56 and through which air flows in and out.

[0040] The flow rate of the lubricating oil OL measured by the overflow flow rate sensor 56 is acquired by the control device 70. The air breather 57 has a filter provided therein, which prevents dust from entering the inside of the bearing housing 50 when air is taken in through the air breather 57. In addition, air can be expelled from the inside of the bearing housing 50 to the outside through the air breather 57.

[0041] A tip 54A of the oil supply pipe 54 is connected to the inside of the bearing housing 50. The oil supply pipe 54 is also provided with an oil supply flow rate sensor 58 as an outward path detection unit that detects the amount of lubricating oil OL supplied to the bearing housing 50. The amount of lubricating oil OL supplied measured by the oil supply flow rate sensor 58 is acquired by the control device 70. The oil supply pipe 54 and the oil supply line 20 are collectively referred to as the outward path.

[0042] The oil return pipe 55 has a tip 55A connected to the inside of the bearing housing 50. The oil return pipe 55 is also provided with an oil return flow rate sensor 59 as a return path detection unit that detects the return amount of lubricating oil OL that is discharged from the bearing housing 50, flows through the oil return pipe 55, and flows into the oil tank 11. The return amount of lubricating oil OL measured by the oil return flow rate sensor 59 is acquired by the control device 70. The oil return pipe 55 and the oil return line 30 are collectively referred to as the return path.

[0043] The oil supply line 20, the oil supply pipe 54, the oil return line 30, the oil return pipe 55, and the air vent pipe 53 are collectively referred to as a lubricating oil path.

[0044] [Control device 70: see Figures 1 and 2] As shown in Fig. 1, a control device 70 that controls the components of the vertical mill apparatus 1 determines whether or not an abnormality has occurred in the circulating supply of lubricating oil OL in the bearing housing 50 by comparing the amount of lubricating oil OL supplied to the bearing housing 50 with the amount of lubricating oil OL returned from the bearing housing 50 to the oil tank 11. The control device 70 also determines whether or not an overflow of lubricating oil OL has occurred from the bearing housing 50 by acquiring the overflow flow rate. The control device 70 also monitors for abnormalities in the bearings 51 and blockages in the return path by acquiring the return oil temperature RT of the lubricating oil OL.

[0045] 2, the control device 70 includes a control device main body 71, a monitor 72, a speaker 73, and an input / output interface 74. The monitor 72, the speaker 73, and the input / output interface 74 are connected to the control device main body 71. The control device main body 71 displays on a monitor 72 various information required for monitoring the operating status, such as flow rate values ​​measured by each flow sensor and temperatures measured by each thermocouple. In addition, various alarms are notified by voice through a speaker 73. Values ​​of control parameters and the like held by the control device main body 71 can be set through an input / output interface 74 by an operator's input operation or by inputting data from an external device.

[0046] The control device main body 71 is made up of a computer device or the like, and includes a calculation unit 71A such as a CPU (Central Processing Unit), a memory 71B, and a storage unit 71C that stores data electromagnetically or optically.

[0047] The control by the control device 70 is performed by executing a computer program.

[0048] [Control procedure of the control device 70: see Figures 3 to 6] The control procedure by the control device 70 of the vertical mill apparatus 1 will be described. 3 is started, the control device main body 71 of the control device 70 causes the pump 21 to be rotationally driven by the motor 22, and the lubricating oil OL stored in the oil tank 11 flows through the oil supply line 20 and is supplied to the bearing housing 50. The lubricating oil OL is also discharged from the bearing housing 50, flows through the oil return line 30, and is returned to the oil tank 11.

[0049] The electromagnetic proportional flow control valve 24 is controlled to achieve the set supply rate FS input by the operator via the input / output interface 74. The flow rates measured by the oil supply flow rate sensor 58 and the oil return flow rate sensor 59 are adjusted to approximately the same flow rate. A lower limit reference supply rate BL and an upper limit reference supply rate BU are set for the supply rate of lubricating oil OL during normal operation. The set supply rate FS is set between the lower limit reference supply rate BL and the upper limit reference supply rate BU.

[0050] The set supply rate FS is set to, for example, 4 L / min. Furthermore, the lower limit reference supply rate BL is set to, for example, 3 L / min, and the upper limit reference supply rate BU is set to, for example, 5 L / min. During normal operation, the control device main body 71 controls the electromagnetic proportional flow control valve 24 so that the supply amount of lubricating oil OL measured by the oil supply flow sensor 58 is equal to or greater than the lower limit standard supply amount BL and equal to or less than the upper limit standard supply amount BU.

[0051] In other words, when the supply rate of lubricating oil OL measured by the oil supply flow sensor 58 is below the lower limit reference supply rate BL, the electromagnetic proportional flow control valve 24 is controlled so that the supply rate of lubricating oil OL measured by the oil supply flow sensor 58 is equal to or greater than the lower limit reference supply rate BL, and when it exceeds the upper limit reference supply rate BU, the electromagnetic proportional flow control valve 24 is controlled so that the supply rate of lubricating oil OL measured by the oil supply flow sensor 58 is equal to or less than the upper limit reference supply rate BU.

[0052] In addition, when the supply amount of lubricating oil OL measured by the oil supply flow sensor 58 is below the lower limit reference supply amount BL, the electromagnetic proportional flow control valve 24 is controlled so that the supply amount of lubricating oil OL measured by the oil supply flow sensor 58 becomes the set supply amount FS, and when it exceeds the upper limit reference supply amount BU, the electromagnetic proportional flow control valve 24 is controlled so that the supply amount of lubricating oil OL measured by the oil supply flow sensor 58 becomes the set supply amount FS.

[0053] In addition, in step S3 described below, when the electromagnetic proportional flow control valve 24 is controlled so that the supply amount of lubricating oil OL falls below the lower limit standard supply amount BL or exceeds the upper limit standard supply amount BU, the control of the electromagnetic proportional flow control valve 24 in step S3 takes priority.

[0054] As shown in Figure 3, the control procedure by the control device main body 71 of the control device 70 includes step S1 of acquiring the flow rates measured by the overflow flow rate sensor 56, the oil supply flow rate sensor 58, and the oil return flow rate sensor 59, step S2 of acquiring the temperature of the lubricating oil OL using the oil tank thermocouple 12, the oil supply thermocouple 25, and the oil return thermocouple 31, and step S3 of monitoring the circulating supply status of the lubricating oil path and making a self-determination based on the acquired information on the flow rate and temperature of the lubricating oil OL. Step S3 corresponds to the determination method of the present invention.

[0055] The order of step S1 for acquiring the flow rate and step S2 for acquiring the temperature does not matter. Furthermore, instead of step S1 for acquiring the flow rate and step S2 for acquiring the temperature, the control device main body 71 may acquire the flow rate and temperature required for oil supply and lubrication state monitoring in the step of oil supply and lubrication state monitoring, or the control device main body 71 may acquire the flow rate and temperature required for self-determination in the step of self-determination.

[0056] Step S3 includes step S31, which first determines the conditions of lubrication, return, and overflow of lubricating oil OL, and issues an alarm or adjusts the supply amount of lubricating oil OL; step S32, which determines whether the return oil temperature RT of the lubricating oil OL is an appropriate temperature if overflow has occurred, and issues a return line abnormality or heats the lubricating oil OL; and step S33, which determines whether the return oil temperature RT is an appropriate temperature, and issues a bearing abnormality.

[0057] Step S31 includes step S311 for determining whether the result of subtracting the return amount from the supply amount is greater than the second threshold value, i.e., excessive oil supply threshold value FU; step S312 for determining whether the overflow flow sensor 56 has detected an overflow of lubricating oil OL if the result of subtracting the return amount from the supply amount is greater than the excessive oil supply threshold value FU; step S313 for determining that lubricating oil OL is leaking from the bearing housing 50 if no overflow is detected, and for issuing an alarm indicating "oil seal damage"; step S314 for determining whether the result of subtracting the return amount from the supply amount is greater than the excessive oil return threshold value FL if the result of subtracting the supply amount from the return amount is less than the excessive oil supply threshold value FU; and step S315 for controlling the electromagnetic proportional flow control valve 24 to increase the supply amount of lubricating oil OL if the result of subtracting the supply amount from the return amount is greater than the excessive oil return threshold value FL. In step S315, the electromagnetic proportional flow control valve 24 may be controlled to increase the supply rate of lubricant OL up to the upper limit reference supply rate BU, or may be controlled so that the supply rate of lubricant OL exceeds the upper limit reference supply rate BU. When controlling the electromagnetic proportional flow control valve 24 so that the supply rate of lubricant OL exceeds the upper limit reference supply rate BU, for example, a set upper limit flow rate UF that is higher than the upper limit reference supply rate BU is set. Then, the electromagnetic proportional flow control valve 24 is controlled to increase the supply rate of lubricant OL up to the set upper limit flow rate UF. Note that if an overflow is detected, the process proceeds to step S32 corresponding to the overflow. In step S313, the control device main body 71 displays an "oil seal damage" alarm on the monitor 72 and issues an audible notification of "oil seal damage" from the speaker 73. After the "oil seal damage" alarm is issued, the oil seal replacement work is carried out.

[0058] By comparing the supply amount and the return amount, it is possible to confirm whether the lubricant oil OL is being circulated to the bearing housing 50 normally. Furthermore, if the difference between the supply amount and the return amount becomes large—for example, if the result of subtracting the return amount from the supply amount is greater than the excessive lubrication threshold FU—the flow rate of the lubricant oil OL measured by the overflow flow rate sensor 56 is used to determine whether an abnormality has occurred anywhere in the lubricant oil path. If the flow rate of the lubricant oil OL measured by the overflow flow rate sensor 56 is, for example, zero or below the minimum measurement limit, it is determined that no overflow of the lubricant oil OL has occurred from the bearing housing 50, and that damage has occurred to the oil seal 60 that seals between the roller shaft 52 and the bearing housing 50, and an alarm is issued. If the flow rate of the lubricant oil OL measured by the overflow flow rate sensor 56 is above the minimum measurement limit, it is determined that an overflow of the lubricant oil OL has occurred from the bearing housing 50, and the process proceeds to step S32, which corresponds to the overflow.

[0059] Step S32 includes step S321 for determining whether the return oil temperature RT is lower than the lower limit temperature TL, step S322 for issuing a "lubricant viscosity abnormality" alert if the return oil temperature RT is lower than the lower limit temperature TL, step S323 for controlling the electromagnetic proportional flow control valve 24 so that the supply amount of lubricant oil OL measured by the oil supply flow sensor 58 becomes the set lower limit flow rate LF, step S324 for issuing an instruction to turn on the heater 13, and step S325 for determining whether the storage temperature OT of the lubricant oil OL measured by the oil tank thermocouple 12 becomes the target temperature TT The control system includes step S325, which waits until the oil return temperature RT reaches a predetermined value, step S326, which issues an instruction to turn off the heater 13, step S327, which controls the electromagnetic proportional flow control valve 24 so that the supply rate of lubricant OL measured by the oil supply flow rate sensor 58 becomes equal to the set supply rate FS, step S328, which controls the electromagnetic proportional flow control valve 24 so that the supply rate of lubricant OL measured by the oil supply flow rate sensor 58 becomes equal to the set lower limit flow rate LF when the oil return temperature RT is equal to or higher than the lower limit temperature TL, and step S329, which issues a "return path clogging" alert. Note that in steps S323 and S328, the electromagnetic proportional flow control valve 24 is controlled to reduce the supply rate of lubricant OL. The set lower limit flow rate LF may be the same as or smaller than the lower limit reference supply rate BL. After step S32 is completed, the process proceeds to step S33. In step S322, the control device main body 71 displays an alarm of "abnormal lubricant viscosity" on the monitor 72 and notifies the user of "abnormal lubricant viscosity" by voice from the speaker 73, and in step S329, displays an alarm of "backward path clogging" on the monitor 72 and notifies the user of "backward path clogging" by voice from the speaker 73. After the "backward path clogging" alarm is issued, work is carried out to clear the backward path clogging.

[0060] After determining that lubricating oil OL is overflowing from the bearing housing 50, by comparing whether the return oil temperature RT is lower than the lower limit temperature TL, it is possible to determine by itself whether the lubricating oil OL, whose temperature has dropped and whose viscosity has increased, is having difficulty flowing through the return oil piping 55 and the return route of the oil return line 30, or whether a blockage has occurred somewhere on the return route.

[0061] If the oil return temperature RT is lower than the lower limit temperature TL, the control device main body 71 displays an alarm of "abnormal lubricant viscosity" on the monitor 72 and issues an audible notification of "abnormal lubricant viscosity" from the speaker 73. Then, in order to keep the flow rate of the lubricant OL overflowing from the bearing housing 50 low, the electromagnetic proportional flow control valve 24 is controlled so that the supply rate of the lubricant OL measured by the oil supply flow sensor 58 becomes the set lower limit flow rate LF. Furthermore, the heater 13 provided in the oil tank 11 heats the lubricant OL stored in the oil tank 11 until the storage temperature OT of the lubricant OL measured by the oil tank thermocouple 12 becomes the target temperature TT.

[0062] After the storage temperature OT of the lubricating oil OL measured by the oil tank thermocouple 12 reaches the target temperature TT, the heater 13 is stopped, and the electromagnetic proportional flow control valve 24 is controlled so that the supply amount of the lubricating oil OL measured by the oil supply flow sensor 58 becomes the set supply amount FS. The lubricating oil OL, whose temperature has dropped and whose viscosity has increased, is heated to a target temperature TT to achieve the appropriate viscosity for the vertical mill apparatus 1, and the amount of lubricating oil OL supplied to the bearing housing 50 can be automatically adjusted to a set lower limit flow rate LF. Note that the target temperature TT varies depending on the type of lubricating oil used, so the temperature must be set according to the type of lubricating oil.

[0063] Even when the oil return temperature RT is higher than the lower limit temperature TL, the electromagnetic proportional flow control valve 24 is controlled so that the supply rate of lubricating oil OL measured by the oil supply flow sensor 58 becomes the set lower limit flow rate LF in order to keep the overflow rate of lubricating oil OL from the bearing housing 50 low. Furthermore, the control device main body 71 displays an alarm of "return path clogging" on the monitor 72 and issues an audible notification of "return path clogging" from the speaker 73. The issuance of the alarm allows the operator to become aware of an abnormality in the lubricating oil path.

[0064] Step S33 includes step S331 for determining whether the oil return temperature RT is higher than the upper limit temperature TU, step S332 for issuing a "bearing abnormality" alert if the oil return temperature RT is higher than the upper limit temperature TU, and step S333 for controlling the electromagnetic proportional flow control valve 24 to increase the supply rate of lubricant OL. In step S333, the electromagnetic proportional flow control valve 24 may be controlled to increase the supply rate of lubricant OL to the upper limit reference supply rate BU, or may be controlled so that the supply rate of lubricant OL exceeds the upper limit reference supply rate BU. When controlling the electromagnetic proportional flow control valve 24 so that the supply rate of lubricant OL exceeds the upper limit reference supply rate BU, for example, a set upper limit flow rate UF that is higher than the upper limit reference supply rate BU is set. Then, the electromagnetic proportional flow control valve 24 is controlled to increase the supply rate of lubricant OL to the set upper limit flow rate UF. In step S332, the control device main body 71 causes the monitor 72 to display a warning of "bearing abnormality" and the speaker 73 to notify the user of the "bearing abnormality" by voice.

[0065] By comparing the oil return temperature RT with the upper limit temperature TU, if the oil return temperature RT exceeds the upper limit temperature TU, for example, because the bearing 51 is not sufficiently lubricated, causing it to heat up and seize, the control device main body 71 displays a "bearing abnormality" alarm on the monitor 72 and issues an audible "bearing abnormality" notification from the speaker 73. The issuance of the alarm allows the operator to become aware of the occurrence of an abnormality in the bearing 51. Furthermore, by increasing the amount of lubricating oil OL supplied, the bearing housing 50 is supplied with enough lubricating oil OL to maintain an oil level sufficient to lubricate the bearing 51.

[0066] [Effects of the embodiment] [Effect 1] The vertical mill apparatus 1 is equipped with an oil supply flow rate sensor 58 that measures the supply amount of lubricating oil OL circulating through the oil supply pipe 54, an oil return flow rate sensor 59 that measures the return amount of lubricating oil OL circulating through the oil return pipe 55, and a control device 70 that determines whether or not an abnormality has occurred in the circulating supply of lubricating oil OL based on the supply amount of lubricating oil OL measured by the oil supply flow rate sensor 58 and the return amount of lubricating oil OL measured by the oil return flow rate sensor 59. Such a vertical mill apparatus 1 can determine abnormalities in the circulatory supply of the lubricating oil OL.

[0067] [Effect 2] The vertical mill apparatus 1 includes an electromagnetic proportional flow control valve 24 that adjusts the supply amount of lubricating oil OL, and a control device 70 that controls the electromagnetic proportional flow control valve 24 based on the supply amount of lubricating oil OL measured by an oil supply flow sensor 58 and the return amount of lubricating oil OL measured by a return oil flow sensor 59. Such a vertical mill apparatus 1 can adjust the amount of lubricant oil OL supplied to increase it when, for example, the amount of lubricant oil OL returned is greater than the amount of lubricant oil supplied, and the difference between the amount of returned and the amount of lubricant oil supplied is greater than the excessive oil return threshold value FL. Also, for example, when the amount of lubricant oil OL supplied is greater than the amount of lubricant oil returned, and the difference between the amount of lubricant oil supplied and the amount of lubricant oil returned is greater than the excessive oil return threshold value FU, the amount of lubricant oil OL supplied can be adjusted to decrease it. In other words, the vertical mill apparatus 1 can respond to abnormalities in the circulating supply of lubricant oil OL.

[0068] [Effect 3] The vertical mill apparatus 1 is equipped with a return oil thermocouple 31 that measures the temperature of the lubricating oil OL flowing through the return oil line 30, and a control device 70 that determines that a bearing abnormality has occurred when the temperature of the lubricating oil OL measured by the return oil thermocouple 31 is higher than the upper limit temperature TU. Such a vertical mill apparatus 1 can determine by itself that an abnormality has occurred in the bearing 51 when the temperature of the lubricating oil OL returned from the bearing housing 50 is higher than the upper limit temperature TU.

[0069] [Effect 4] The vertical mill device 1 is an overflow flow sensor 56 for measuring the flow rate of the lubricating oil OL flowing through the air vent pipe 53; An oil return thermocouple 31 for measuring the temperature of the lubricating oil OL flowing through the oil return line 30; When the lubricating oil OL is measured by the overflow flow sensor 56, If the temperature of the lubricating oil OL measured by the return oil thermocouple 31 is lower than the lower limit temperature TL, it is determined that the viscosity of the lubricating oil OL is high, The control device 70 determines that the return path is clogged when the temperature of the lubricating oil OL measured by the return oil thermocouple 31 is equal to or higher than the lower limit temperature TL. When an overflow occurs from the bearing housing 50, such a vertical mill apparatus 1 can determine by itself, from the measurement results of the return oil temperature RT, whether the high viscosity of the lubricating oil OL has made it difficult for the lubricating oil OL to flow through the return path, or whether a blockage has occurred in the return path.

[0070] In addition to the above, the configurations given in the above embodiments can be selected or changed as appropriate to other configurations without departing from the spirit of the present invention.

[0071] In steps S323 and S328, the electromagnetic proportional flow control valve 24 is controlled to reduce the supply amount of lubricating oil OL and to reach the set lower limit flow rate LF, but this is not limited to this, and the electromagnetic proportional flow control valve 24 may also be controlled to close. [Explanation of symbols]

[0072] 1 Vertical mill equipment 10 Circulating oil supply unit 11 Oil Tank 12 Oil tank thermocouple 13 Heater 20 Fuel Line 20U upstream end 21 Pump 22 Motor 23 Cooler 24 Electromagnetic proportional flow control valve 25 Oil supply thermocouple 30 Oil return line 30D downstream end 30U upstream end 31 Oil return thermocouple 32 Magnetic separator 33 Jet Pump 40 Bypass Line 41 Bypass valve 50 Bearing housing 51 Bearings 52 Roller shaft 53 Air vent piping 53A Tip 54 Oil supply pipe 54A tip 55 Oil return pipe 55A tip 56 Overflow flow sensor 57 Air Breather 58 Oil flow rate sensor 59 Return oil flow sensor 60 Oil seal 70 Control device 71 Control device main body 71A Arithmetic unit 71B memory 71C Storage section 72 monitors 73 Speaker 74 Input / Output Interface 100 Crushing roller 101 Laura 200 Rotary Table BL lower limit standard supply amount BU Upper limit standard supply amount FS setting supply amount FL Excessive oil return threshold (first threshold) FU Excess supply threshold (second threshold) LF lower limit flow rate OL lubricant OT Storage temperature RM raw material RT Return oil temperature ST Oil temperature TL lower limit temperature TT target temperature TU upper limit temperature UF upper limit flow rate setting

Claims

1. A vertical mill device that circulates and supplies lubricating oil to lubricate bearings that rotatably support grinding rollers, an oil tank in which the lubricating oil is stored; a bearing housing to which the lubricating oil for lubricating the bearing is supplied and discharged; an outgoing path for flowing the lubricating oil from the oil tank to the bearing housing; an outward path detection unit that detects the supply amount of the lubricating oil flowing through the outward path; a return path for flowing the lubricating oil from the bearing housing to the oil tank; a return path detection unit that detects the return amount of the lubricating oil flowing through the return path; and a control unit that determines whether or not an abnormality has occurred in the circulating supply of the lubricating oil based on the supply amount of the lubricating oil detected by the forward path detection unit and the return amount of the lubricating oil detected by the return path detection unit. Vertical mill equipment.

2. a supply amount adjusting unit that adjusts the supply amount of the lubricating oil; a control unit that controls the supply amount adjustment unit based on the supply amount of the lubricating oil detected by the forward path detection unit and the return amount of the lubricating oil detected by the backward path detection unit, The vertical mill apparatus according to claim 1.

3. The control unit When the return amount is greater than the supply amount and the difference between the return amount and the supply amount is greater than a first threshold value, the supply amount adjusting unit is controlled to increase the supply amount. The vertical mill apparatus according to claim 2.

4. The control unit When the return amount is smaller than the supply amount and the difference between the return amount and the supply amount is larger than a second threshold value, the supply amount adjusting unit is controlled to reduce the supply amount. The vertical mill apparatus according to claim 2.

5. an air supply / discharge path for supplying or discharging air to the bearing housing; a supply / discharge path detection unit that detects the flow rate of the lubricating oil when the lubricating oil flows through the supply / discharge path, The control unit When the flow rate of the lubricating oil is detected by the supply / discharge path detection unit, it is determined that an abnormality has occurred in the return path, When the flow rate of the lubricating oil is not detected by the supply / discharge path detection unit, it is determined that leakage of the lubricating oil from the bearing housing has occurred. The vertical mill apparatus according to claim 2.

6. A return oil temperature detection unit is provided to detect the return oil temperature of the lubricating oil circulating in the return path, The control unit When the flow rate of the lubricating oil is detected by the supply / discharge path detection unit, When the return oil temperature is equal to or higher than a lower limit temperature, it is determined that a blockage has occurred in the return path, If the return oil temperature is lower than a lower limit temperature, it is determined that an abnormality in the viscosity of the lubricating oil has occurred. The vertical mill apparatus according to claim 5.

7. A vertical mill device that circulates and supplies lubricating oil to lubricate bearings that rotatably support grinding rollers, an oil tank in which the lubricating oil is stored; a bearing housing to which the lubricating oil for lubricating the bearing is supplied and discharged; an outgoing path for flowing the lubricating oil from the oil tank to the bearing housing; a return path for flowing the lubricating oil from the bearing housing to the oil tank; A return oil temperature detection unit that detects the return oil temperature of the lubricating oil circulating through the return path; an air supply / discharge path for supplying or discharging air to the bearing housing; a supply / discharge path detection unit that detects a flow rate of the lubricating oil when the lubricating oil flows through the supply / discharge path; The flow rate of the lubricating oil is detected by the supply and discharge path detection unit, and when the return oil temperature is equal to or higher than a lower limit temperature, a control unit is provided which determines that an abnormality has occurred in the return path. Vertical mill equipment.

8. A vertical mill device that circulates and supplies lubricating oil to lubricate bearings that rotatably support grinding rollers, an oil tank in which the lubricating oil is stored; a bearing housing to which the lubricating oil for lubricating the bearing is supplied and discharged; an outgoing path for flowing the lubricating oil from the oil tank to the bearing housing; a return path for flowing the lubricating oil from the bearing housing to the oil tank; A return oil temperature detection unit that detects the return oil temperature of the lubricating oil circulating through the return path; A control unit that determines that an abnormality has occurred in the bearing when the return oil temperature is higher than an upper limit temperature. Vertical mill equipment.

9. a supply amount adjusting unit that adjusts the supply amount of the lubricating oil flowing through the outgoing path, The control unit When it is determined that an abnormality has occurred in the bearing, a bearing abnormality is reported, and the supply amount adjusting unit is controlled to increase the supply amount. The vertical mill apparatus according to claim 8.

10. A method for determining whether or not an abnormality has occurred in a vertical mill apparatus that circulates lubricating oil from an oil tank to a bearing housing through which the lubricating oil is supplied and discharged to lubricate bearings that rotatably support grinding rollers, comprising: determining whether or not an abnormality has occurred in the circulation supply of the lubricating oil based on the amount of the lubricating oil supplied from the oil tank to the bearing housing and the amount of the lubricating oil returned from the bearing housing to the oil tank; Judgment method.

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