WO2018123697A1

WO2018123697A1 - Vertical mill

Info

Publication number: WO2018123697A1
Application number: PCT/JP2017/045393
Authority: WO
Inventors: 武士佐藤; 高浪　裕智; 規史石橋
Original assignee: 株式会社アーステクニカ
Priority date: 2016-12-29
Filing date: 2017-12-18
Publication date: 2018-07-05
Also published as: JP6914036B2; JP2018108557A

Abstract

Provided is a vertical mill provided with a rotating table (3) disposed within a casing (2), a roller (4) disposed above the rotating table (3), and a gap adjustment device (5) for adjusting the gap between the roller (4) and the rotating table (3). The gap adjustment device (5) is constituted so as to detect contact between the roller (4) and the rotating table (3) and adjust the gap between the roller (4) and the rotating table (3) on the basis of the state when the contact is detected. It is possible to easily optimize the gap between the rotating table and the roller for manufacturing a high-quality powdered product without cooling the interior of the casing or releasing air, performing restoration work for restarting operations, etc.

Description

Vertical mill

The present invention relates to a vertical mill that pulverizes an object to be crushed such as coal between a rotary table and a roller.

As shown in FIG. 1, a vertical mill 51 that sandwiches and pulverizes an object to be crushed such as coal generally has a casing 52 and a rotary table that rotates in a horizontal plane by laminating the object to be crushed inside the casing 52. 53, a pressurizing mechanism 55 using a hydraulic cylinder or the like, and a roller 54 swingably disposed around the support shaft 56 at the tip of the roller support member 59. The object to be crushed stacked on 53 is pulverized by pressing the roller 54 against the surface of the rotary table 53 (for example, Patent Document 1).

In the vertical mill 51 based on such a crushing mechanism, when a sufficient amount of objects to be crushed is not stacked on the rotary table 53 immediately after the start of operation, the roller 54 comes into contact with the surface of the rotary table 53, The roller 54 and the rotary table 53 may be seriously damaged, excessive vibration may be generated in the vertical mill 51, and the vertical mill 51 may be seriously damaged.

For this reason, in the vertical mill 51, generally, the pressure mechanism 55 swings the roller 54 downward so that the gap between the rotary table 53 and the roller 54 does not approach a preset minimum gap or less. A stopper 57 for limiting is provided. For example, when the adjustment bolt 58 moves back and forth, the stopper 57 is positioned at a position corresponding to the minimum gap, and the lower contact portion 60 of the roller support member 59 is the tip of the stopper 57. The roller 54 is configured to limit the downward swing of the roller 54.

Here, since the surface of the rotary table 53 and the roller 54 progresses as the operating time of the vertical mill 51 elapses, the predetermined interval is maintained in accordance with the amount of wear. Therefore, it is necessary to readjust the position of the adjusting bolt 58.

However, the readjustment of the position of the adjusting bolt 58 is conventionally performed by opening the inside of the casing 52 of the vertical mill 51 and placing the object to be crushed on the rotary table 53 with a spacer or measuring instrument. For example, the adjustment bolt 58 must be operated and adjusted while measuring the gap between the rotary table 53 and the roller 54. For this reason, the work is complicated, and it is necessary to stop the operation of the vertical mill 51 for a long period of time for cooling in the machine, opening to the atmosphere, recovery for restarting operation, and the like, and the operating rate is lowered. was there.

In addition, in order to determine the necessity of replacement by grasping the increase in the amount of wear of the roller 54 and the rotary table 53 as the operation time elapses, it is necessary to appropriately grasp the amount of wear of the roller 54 and the rotary table 53. However, conventionally, since the inside of the casing 52 of the vertical mill 51 is opened and the object to be crushed is not placed on the rotary table 53, the amount of wear is measured using a measuring instrument or the like. As in the case of readjustment of the position of the adjustment bolt 58, it is necessary to stop the operation of the vertical mill 51 for a long time in order to cool the interior of the machine, release the atmosphere, restore the operation to resume operation, etc. There was a problem of lowering.

JP-A-5-345138

The present invention was made to solve the above-described problems of the prior art, and does not require cooling work in the casing, release to the atmosphere, and recovery work for resuming operation. It is an object of the present invention to provide a vertical mill that can easily optimize a gap between a rotary table and a roller for manufacturing.

In order to solve the above problems, a first aspect of the present invention includes a casing, a rotary table disposed in the casing, a roller disposed above the rotary table, the roller, and the rotary table. A gap adjusting device for adjusting the gap of the roller, the gap adjusting device detecting that the roller and the rotary table are in contact with each other, and using the roller on the basis of the state at the time of detecting contact It is comprised so that the clearance gap with the said rotary table may be adjusted.

According to a second aspect of the present invention, in the first aspect, the gap adjusting device includes a hydraulic cylinder for driving the roller up and down, and the hydraulic cylinder is operated to lower the roller. Based on a change in the hydraulic pressure of the hydraulic cylinder, it is configured to detect that the roller is in contact with the rotary table.

According to a third aspect of the present invention, in the first or second aspect, the gap adjusting device has a roller support member for swingably supporting the roller, and when the roller is lowered. Based on a change in the swing angle of the roller support member, it is configured to detect that the roller is in contact with the rotary table.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the gap adjustment device includes a current acquisition unit for acquiring a drive current of an electric motor that drives the rotary table, Based on a change in driving current of the electric motor when the roller is lowered, it is configured to detect that the roller is in contact with the rotary table.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, load acquisition means for acquiring a load acting on the rotary table is provided in the rotary table, and the roller is lowered. It is configured to detect that the roller is in contact with the rotary table based on a change in the load acquired by the load acquisition means.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the gap adjusting device restricts the roller from approaching the rotary table beyond a predetermined minimum gap. Minimum gap limiting means for detecting a contact between the roller and the rotary table, and setting the minimum gap based on a state at the time of contact detection. It is comprised in that.

According to a seventh aspect of the present invention, in the sixth aspect, the gap adjusting device has a roller support member for swingably supporting the roller, and the minimum gap limiting means is the roller support member. And a servo motor for driving the pressure receiving portion forward and backward, and driving the servo motor in a state where the pressure receiving portion is in contact with the roller support member. Based on a change in drive current of the servo motor when the pressure receiving portion is moved backward to lower the roller, it is configured to detect that the roller is in contact with the rotary table. And

According to an eighth aspect of the present invention, in the seventh aspect, the eighth aspect includes a cylinder having a piston rod whose tip is connected to or abuts on the roller support member, and the roller support member is pressed by the piston rod. It is comprised so that a roller may be pressed toward the said rotary table, It is characterized by the above-mentioned.

According to a ninth aspect of the present invention, in any one of the first to eighth aspects, the rotary table is rotated in a state where the roller is in contact with the rotary table to detect a road surface state of the rotary table. It is characterized by comprising a detecting means for the purpose.

A tenth aspect of the present invention is characterized in that, in the ninth aspect, the detection means is configured to detect a position where the roller is most raised when the rotary table is rotated. To do.

According to an eleventh aspect of the present invention, in the ninth or tenth aspect, the detection means has a swing angle of a roller support member for swingably supporting the roller or a tip portion of the roller support member. The road surface state of the rotary table is detected based on the amount of movement of the piston rod of the hydraulic cylinder to be connected or abutted.

According to a twelfth aspect of the present invention, in any one of the ninth to eleventh aspects, the detection means detects a road surface state of the rotary table based on a drive current of an electric motor that drives the rotary table. It is comprised in that.

According to a thirteenth aspect of the present invention, in any one of the first to thirteenth aspects, the gap adjustment device is configured based on a rocking angle of the roller support member for swingably supporting the roller. It is comprised so that the clearance gap between a roller and the said rotary table may be adjusted.

In order to solve the above problems, a fourteenth aspect of the present invention includes a casing, a rotary table disposed in the casing, a roller disposed above the rotary table, the roller, and the rotary table. A gap adjusting device for adjusting the gap of the rotary table, wherein the gap adjusting device detects the road surface state of the rotary table by rotating the rotary table in a state where the roller is in contact with the rotary table. It has the detection means for, It is characterized by the above-mentioned.

A fifteenth aspect of the present invention is characterized in that, in the fourteenth aspect, the detection means is configured to detect a position where the roller is most raised when the rotary table is rotated. To do.

According to a sixteenth aspect of the present invention, in the fourteenth or fifteenth aspect, the detection means has a swing angle of a roller support member for swingably supporting the roller or a tip end portion of the roller support member. The road surface state of the rotary table is detected based on the amount of movement of the piston rod of the hydraulic cylinder to be connected or abutted.

According to a seventeenth aspect of the present invention, in any one of the fourteenth to sixteenth aspects, the detection means detects a road surface state of the rotary table based on a drive current of an electric motor that drives the rotary table. It is comprised in that.

According to an eighteenth aspect of the present invention, in any one of the fourteenth to seventeenth aspects, the gap adjustment device is configured based on a swing angle of the roller support member for swingably supporting the roller. It is comprised so that the clearance gap between a roller and the said rotary table may be adjusted.

The vertical mill according to the present invention eliminates the need for cooling work inside the casing, opening to the atmosphere, and restoration work for resuming operation, and the clearance between the rotary table and the roller is produced for the production of high-quality powder products. Easy to optimize.

It is sectional drawing which shows the structure of the conventional vertical mill. It is a figure which shows the structure of the clearance gap adjustment apparatus in 1st embodiment of the vertical mill which concerns on this invention. It is a figure which shows the structure of the clearance gap adjustment apparatus in 2nd embodiment of the vertical mill which concerns on this invention.

Hereinafter, an embodiment of a vertical mill according to the present invention will be described with reference to the drawings.

<First embodiment>
FIG. 2 is a diagram showing a configuration of the gap adjusting device in the first embodiment of the vertical mill according to the present invention. The first embodiment of the vertical mill according to the present invention is the same as that of the vertical mill shown in FIG. 1 unless there is a particular contradiction in the parts other than the gap adjusting device shown in FIG. .

The vertical mill of the first embodiment includes a casing 2, a rotary table 3 that is disposed inside the casing 2 and rotates by stacking objects to be crushed, a roller 4 that is disposed above the rotary table 3, a roller 4, and a gap adjusting device 5 for adjusting the gap between the roller 4 and the rotary table 3.

The gap adjusting device 5 rotatably holds the hydraulic cylinder 6 and the roller 4 supported by the casing 2 and swings up and down around the support shaft 10 by the hydraulic cylinder 6 to raise and lower the roller 4. And a stopper 14 as minimum gap limiting means for limiting the roller 4 and the rotary table 3 from approaching over a predetermined minimum gap.

The hydraulic cylinder 6 is a double-acting type, and is configured such that hydraulic fluid is supplied from the hydraulic pump 22 to both sides of the piston in the hydraulic cylinder 6 via the switching valve 23 and the flow rate control valve 29. Accordingly, when hydraulic oil is supplied to the cylinder chamber on the rear side of the piston (the inside of the casing 2 of the hydraulic cylinder 6 is referred to as the front side and the opposite side is referred to as the rear side) via the supply pipe 33, the piston rod 19 is When the hydraulic oil is advanced and supplied to the cylinder chamber on the front side of the piston via the supply pipe 34, the piston rod 19 moves backward. As a result, the piston rod 19 is moved forward and backward by the hydraulic cylinder 6, and the roller support member 7 connected to the tip of the piston rod 19 swings up and down around the support shaft 10, thereby moving the roller 4 up and down. be able to.

The oil pressure inside the supply line 33 can be detected by the pressure sensor 24. A detection signal from the pressure sensor 24 is transmitted to the hydraulic control device 20.

The forward / reverse speed of the piston rod 19 can be adjusted by controlling the flow rate of the hydraulic oil supplied to the hydraulic cylinder 6 by the flow rate adjusting valve 29. The support shaft 10 is supported by a cover 30 that is detachably connected to the casing 2 by mounting bolts 31.

An angle sensor 8 for detecting the swing angle of the roller support member 7 is attached to the support shaft 10.

As shown in FIG. 2, the stopper 14 includes a female screw 15 disposed in a lower portion of the cover 30 and a push bolt 16 that is screwed into the female screw 15. By rotating the push bolt 16, the stopper 14 is provided. , Can move in the axial direction. The push bolt 16 can be fixed by a fixing nut 35.

The piston rod 19 is moved forward by the hydraulic cylinder 6 to swing the roller support member 7 downward, and the contact portion 18 disposed at the lower portion of the roller support member 7 is disposed at the tip of the push bolt 16. When the roller 4 and the rotary table 3 are restricted from approaching beyond a predetermined minimum gap (setting of a minimum gap limit) Then, the push bolt 16 is moved forward and backward by rotating the push bolt 16 to position the pressure receiving portion 17 at a position corresponding to the minimum gap.

Here, in addition to preventing the roller 4 from coming into contact with the rotary table 3, the minimum gap is used to ensure the quality of the pulverized product such as the particle size when the pulverized product is pulverized to produce the pulverized product. Is selected as an appropriate gap between the roller 4 and the rotary table 3.

In accordance with an increase in the amount of wear on the surface of the roller 4 and / or the rotary table 3 with the elapse of the operation time of the vertical mill, the push bolt 16 is moved backward and the roller 4 is lowered, and the pressure receiving portion 17 of the push bolt 16 is moved to the roller. The gap between the roller 4 and the rotary table 3 in a state in which the abutting portion 18 of the support member 7 abuts is set to a predetermined minimum gap according to the properties of the minimum gap to-be-ground material and the required quality of the powder product. In the vertical mill according to this embodiment, the roller 4 is connected to the rotary table 3 in a state where the inside of the casing 2 is isolated from the outside air without opening the inspection port. The contact is detected, and the minimum gap between the roller 4 and the rotary table 3 is set based on the detected position where the roller 4 and the rotary table 3 are in contact.

Hereinafter, in the present embodiment, the distance between the roller 4 and the turntable 3 after the roller 4 or the like is worn by performing the operation of the vertical mill, such as a method of setting the distance between the roller 4 and the turntable 3 to the minimum gap. A method for setting the minimum gap to the minimum gap will be described.

The push bolt 16 is moved backward to a position where the roller 4 can come into contact with the rotary table 3 (the minimum clearance restriction is released), and the switching valve 23 is operated to supply hydraulic oil to the cylinder chamber on the rear side of the piston. The gate valve (gate valve) 32 is normally closed. Thereby, the piston rod 19 moves forward, and the roller 4 is lowered toward the rotary table 3 by the swinging of the roller support member 7.

When the roller 4 comes into contact with the rotary table 3, the lowering of the roller 4 is restricted by the rotary table 3 and the downward swing of the roller support member 7 is stopped, while hydraulic oil is supplied to the cylinder chamber on the rear side of the piston. Therefore, the pressure P of the hydraulic oil in the cylinder chamber on the rear side of the piston increases.

Thus, the pressure P of the pressure sensor 24 disposed in the supply pipe 33 to the cylinder chamber on the rear side of the piston is monitored, and the contact of the roller 4 with the rotary table 3 is detected by the increase of the pressure P. Can do.

Here, when the roller 4 comes into contact with the rotary table 3, the roller support member 7 does not further swing downward, so that, for example, the forward movement of the piston rod 15 takes into account the pulsation of the pressure system of the hydraulic cylinder. By using the swing angle measured by the angle sensor 8 when the pressure rises by a predetermined threshold value (for example, 5% to 10%) with respect to the current pressure P0, the roller 4 contacts the rotary table 3. An accurate swing angle at the time of contact can be acquired.

The pressure P signal measured by the pressure sensor 24 is transmitted to the signal processing unit 26 in the control device 28 of the gap adjusting device 5 to monitor and judge an increase in the predetermined threshold with respect to the pressure P0. The swing angle input from the angle sensor 8 at the time when the roller 4 is raised is acquired as the swing angle when the roller 4 comes into contact with the rotary table 3 through the swing angle acquisition unit 27 and is stored in the storage unit 25. To remember.

The storage unit 25 stores the relationship between the gap between the roller 4 and the rotary table 3 with respect to the swing angle of the roller support member 7 with respect to the contact point between the roller 4 and the rotary table 3, and the front and rear of the piston rod 19 of the hydraulic cylinder 6. The relationship between the advance amount and the swing angle of the roller support member 7 is stored in the form of a table or a function, and a roller for setting a minimum gap by the signal processing unit 26 based on the stored data. A swing angle at which the support member 7 should be swung upward is calculated, and a backward travel distance of the piston rod 19 to be swung by the calculated swing angle is calculated.

The storage unit 25 includes a relationship between a gap between the roller 4 and the rotary table 3 with respect to a swing angle of the roller support member 7 with respect to a contact point between the roller 4 and the rotary table 3, and a piston rod of the hydraulic cylinder 6. In place of the two types of relationship between the forward / backward movement amount 19 and the swing angle of the roller support member 7, the hydraulic cylinder 6 against the gap between the roller 4 and the rotary table 3 with respect to the contact point of the rotary table 3 is used. The relationship of the forward / backward travel amount of the piston rod 19 may be stored, and the backward travel distance of the piston rod 19 may be calculated by the signal processing unit 26 to set the minimum clearance based on the stored data. .

Then, a command is issued from the signal processing unit 26 to the hydraulic control device 20 so that the piston rod 19 moves backward by the distance calculated as described above, and the piston rod 19 moves backward so that the roller 4 is at a minimum with respect to the rotary table 3. Ascend to a position away from the gap and stop.

In order to accurately execute the positioning of the piston rod 19 that secures this minimum clearance, it is preferable that the hydraulic control system of the hydraulic cylinder 6 is a servo control system for the position.

Thereafter, the push bolt 16 is moved forward to bring the pressure receiving portion 17 at the tip into contact with the contact portion 18 of the roller support member 7, and then fixed with a fixing nut 35 so that the push bolt 16 does not move forward and backward.

In order to prevent leakage and damage to the hydraulic seals and the like due to high pressure, the contact of the roller 4 with the rotary table 3 is detected by a predetermined pressure increase of the hydraulic oil, and at the same time the operation to the hydraulic cylinder 6 is performed. Stop supplying oil.

In the above-described embodiment, the gap between the roller 4 and the rotary table 3 is adjusted based on the swing angle of the roller support member 7 measured by the angle sensor 8, but instead of the angle sensor 8, For example, a linear scale (distance sensor) that measures the amount of movement of the piston rod 19 of the hydraulic cylinder 5 is used to determine the piston based on the position information of the piston rod 19 when the contact between the roller 4 and the rotary table 3 is detected. Depending on the relationship between the amount of movement of the rod 19 and the amount of elevation of the roller 4, etc., gap adjustment, minimum gap limit setting, etc. may be performed. The same applies to modified examples and other embodiments described below.

By the above method, since the minimum gap can be set in a state where the inside of the casing 2 is isolated from the outside air without removing the cover 14, the inside of the casing 2 is cooled, released into the atmosphere, and restored for restarting operation. Therefore, it is possible to easily secure a gap between the predetermined rotary table 3 and the roller 4 to manufacture a high-quality powder product.

It should be noted that the rocking angle of the roller support member 7 or the position of the piston rod 19 when the roller 4 and the rotary table 3 in the initial production state are brought into contact with each other is measured and recorded, and after a predetermined operation. The swing angle of the roller support member 7 or the position of the piston rod 19 when the roller 4 and the rotary table 3 are brought into contact with each other is measured, and the swing angle of the roller support member 7 or the position of the piston rod 19 at the beginning of manufacture is measured. , The total amount of wear of the roller 4 and the rotary table 3 can be obtained by the signal processing unit 26 according to the relationship stored in the storage unit 25, and the inside of the casing 2 can be cooled, opened to the atmosphere, and restarted. Therefore, it is possible to estimate the replacement life or the like of the roller 4 or the rotary table 3 without the need for recovery or the like.

(1) Modification 1
As a modification of the method of (re) setting the minimum gap in the first embodiment (hereinafter referred to as “basic example of the first embodiment”), a method described below (hereinafter referred to as “first implementation”). The minimum gap can also be (re-) set also by “Modification 1 of the embodiment”. Note that matters not specifically described below are the same as those in the basic example of the first embodiment unless there is a contradiction or the like.

First, similarly to the basic example in the first embodiment, the push bolt 16 is moved backward to a position where the roller 4 can come into contact with the rotary table 3 (release of the minimum clearance restriction), and the switch valve 23 is operated to operate. The hydraulic oil is supplied to the cylinder chamber on the rear side of the piston to advance the piston rod 19, and the roller 4 is lowered toward the rotary table 3 by the swinging of the roller support member 7.

When the roller 4 comes into contact with the turntable 3, the turndown of the roller 4 is restricted by the turntable 3, and the downward swing of the roller support member 7 is stopped.

Thereby, the output signal of the angle sensor 8 can be monitored, and the contact of the roller 4 with the rotary table 3 can be detected when the change in the swing angle is eliminated.

Based on the angle signal acquired (measured) by the angle sensor 8, the angle calculated by the swing angle acquisition unit 27 and the signal processing unit 26 by the above method is the swing when the roller 4 comes into contact with the rotary table 3. The angle is determined and stored in the storage unit 25.

The storage unit 25 stores the relationship between the gap between the roller 4 and the rotary table 3 with respect to the swing angle of the roller support member 7 with respect to the contact point between the roller 4 and the rotary table 3, and the movement of the piston rod 19 of the hydraulic cylinder 6. The relationship between the amount and the swing angle of the roller support member 7 is stored in the form of a table or a function, and the roller support is used to set the minimum gap by the signal processing unit 26 based on the stored data. A swing angle at which the member 7 is to be swung upward is calculated, and a backward travel distance of the piston rod 19 to be swung by the calculated swing angle is calculated.

Then, the signal processing unit 26 instructs the hydraulic control device 20 to move the piston rod 19 backward by the distance calculated as described above, the piston rod 19 moves backward, and the roller 4 moves to the minimum clearance with respect to the rotary table 3. Ascend to a distant position and stop.

(2) Modification 2
As a modification of the basic example of the first embodiment, the minimum gap can be (re) set also by a method described below (hereinafter referred to as “variation 2 of the first embodiment”). Note that matters not specifically described below are the same as those in the basic example of the first embodiment unless there is a contradiction or the like.

First, the supply of hydraulic oil to the hydraulic cylinder 6 is stopped, the switching valve 23 is opened, and the cylinder chambers on both sides of the piston of the hydraulic cylinder 6 are connected via a supply line 33 and a supply line 34. To do. As a result, when a load acts on the piston rod 19 in the axial direction, hydraulic oil can freely flow between the cylinder chambers on both sides of the piston of the hydraulic cylinder 6, and the piston rod 19 can freely move in the load acting direction. Can move.

Next, when the push bolt 16 is rotated and the push bolt 16 is moved backward, an acting force (moment) that swings downward due to the weight of the roller 4 and the roller support member 7 acts on the roller support member 7. Accordingly, since the piston rod 19 freely moves forward without restriction, the roller support member 7 is in contact with the pressure receiving portion 17 in the state where the contact portion 18 of the roller support member 7 follows the backward movement of the pressure receiving portion 17 of the push bolt 16. The member 7 swings downward.

When the roller support member 7 swings downward and the roller 4 contacts the rotary table 3, the contact portion 18 cannot follow the movement of the pressure receiving portion 17, and the roller support member 7 swings downward. Therefore, by monitoring the change in the swing angle measured by the angle sensor 8, the contact of the roller 4 with the rotary table 3 can be detected when the swing angle becomes a constant value. it can.

Then, the signal processing unit 26 instructs the hydraulic control device to move the piston rod 19 backward by the distance calculated as described above, and the piston rod 19 moves backward so that the roller 4 is separated from the rotary table 3 by the minimum clearance. Ascend to the position and stop.

(3) Modification 3
As a modification of the basic example of the first embodiment, the minimum gap can also be (re) set by a method described below (hereinafter referred to as “modification 3 of the first embodiment”). Note that matters not specifically described below are the same as those in the basic example of the first embodiment unless there is a contradiction or the like.

Modification 3 of the first embodiment further includes a motor ammeter (not shown) that measures the motor current of an electric motor (not shown) that drives the rotary table 3 to rotate, and the hydraulic pressure of the hydraulic cylinder 6 in the basic example. It detects that the roller 4 contact | abutted to the turntable 3 based on the change of the motor current measured with the motor ammeter instead of the change of these.

Hereinafter, after the operation of the saddle type mill, such as a method of (re) setting the distance between the roller 4 and the rotary table 3 in the modified example 3 to the minimum gap, the roller 4 and the rotary table 3 A method for setting the minimum gap (re-) interval will be described.

First, similarly to the basic example of the first embodiment, the push bolt 16 is moved backward to a position where the roller 4 can come into contact with the rotary table 3 (release of the minimum gap restriction).

Thereafter, the rotary table 3 is rotated, and the switching valve 23 is operated to supply hydraulic oil to the cylinder chamber on the rear side of the piston to advance the piston rod 19, and the roller support member 7 is swung. The roller 4 is lowered toward the rotary table 3.

When the roller 4 comes into contact with the turntable 3, a large pressing force by the roller 4 acts on the turntable 3, so that the load torque for rotating the turntable 3 is greatly increased, thereby rotating the turntable 3. The motor current of the electric motor is greatly increased. Therefore, the motor current is monitored, and the contact of the roller 4 with the rotary table 3 can be detected by the increase.

Here, when the roller 4 comes into contact with the rotary table 3, the roller support member 7 does not further swing downward. Therefore, considering the pulsation of the motor current and the like, for example, the roller 4 is applied to the rotary table 3. By using the swing angle measured by the angle sensor 8 when a predetermined threshold value (for example, 5% to 10%) increases with respect to the motor current value before contact, an accurate swing angle can be obtained. Can be acquired.

Then, the signal processing unit 26 instructs the hydraulic control device so that the piston rod 19 moves backward by the distance calculated as described above, and the piston rod 19 moves backward so that the roller 4 moves away from the rotary table 3 by the minimum gap. Ascend to the position and stop.

When the roller 4 is lowered and brought into contact with the rotary table 3, the roller 4 is lowered while rotating the rotary table 3 in advance, and a change in current value at the time of contact can be detected. Alternatively, the lowering operation of the roller 4 is performed in stages, and the rotary table 3 is rotated after each lowering operation to detect a change in the current value between the non-contact state and the contact state. Also good.

When the turntable 3 has a wear amount distribution in the circumferential direction or when the roller 4 has a wear amount distribution along the outer periphery, the pressing force of the turntable by the roller 4 varies accordingly. The motor current of the electric motor that rotationally drives the rotary table 3 fluctuates due to fluctuations in the load torque for rotating the rotary table 3. Therefore, the distribution of the amount of wear in the circumferential direction of the turntable 3 or the distribution of the amount of wear along the outer periphery of the roller 4 can be estimated from the fluctuation state of the motor current.

(4) Modification 4
As a modification of the basic example of the first embodiment, the minimum gap can also be (re) set by a method described below (hereinafter referred to as “variation 4 of the first embodiment”). Note that matters not specifically described below are the same as those in the basic example of the first embodiment unless there is a contradiction or the like.
The modification 4 of the first embodiment further includes a vertical / horizontal load sensor (not shown) that measures the vertical / horizontal load acting in the vertical direction or the horizontal direction of the rotary table 3. Instead of changing the hydraulic pressure, it is detected that the roller 4 has come into contact with the rotary table 3 based on the change in vertical / horizontal load measured by the vertical / horizontal load sensor. As the vertical / horizontal load sensor, for example, a strain gauge or a load cell (a strain type, a magnetostriction type, a capacitance type, a gyro type, etc.) can be used, and is attached to the side surface or the back surface of the rotary table 3.

Hereinafter, the method of setting the gap between the roller 4 and the rotary table 3 in the modified example 4 to the minimum gap, etc., especially the operation of the vertical mill, and the gap between the roller 4 and the rotary table 3 after the roller 4 etc. is worn out. A method for setting the minimum gap will be described.

First, similarly to the basic example in the first embodiment, the push bolt 16 is moved backward to a position where the roller 4 can come into contact with the rotary table 3 (release of the minimum gap restriction).

Thereafter, the switching valve 23 is operated to supply the hydraulic oil to the cylinder chamber on the rear side of the piston to advance the piston rod 19, and the roller 4 moves toward the rotary table 3 by the swinging of the roller support member 7. To lower.

When the roller 4 comes into contact with the rotary table 3, a large pressing force by the roller 4 is applied to the rotary table 3, and the vertical load on the rotary table 3 greatly increases. And the contact of the roller 4 with the rotary table 3 can be detected.

Here, when the roller 4 comes into contact with the rotary table 3, the roller support member 7 does not further swing downward. The swing angle measured by the angle sensor when a predetermined threshold value (for example, 5% to 10%) is increased with respect to the vertical / horizontal load measurement value before contact with the rotary table 3 is used. As a result, an accurate swing angle can be acquired.

In addition, when there is one vertical / horizontal load sensor attached to the rotary table 3, when the roller 4 is in contact with a position far from the vertical load sensor, there is a possibility that an increase in the vertical / horizontal load cannot be detected. By arranging a vertical / horizontal load sensor in the vicinity of the circumferential line where the roller 4 and the rotary table 3 abut, the contact point between the roller 4 and the rotary table 3 is vertical / horizontal because the rotary table 3 is rotating. While it is possible to detect the increase in the vertical load by rotating up to the region where the load sensor can be detected, the change in the vertical / horizontal load does not change after the roller 4 comes into contact with the rotary table 3 because the rotation angle does not change. The swing angle acquired at the time of detection is the swing angle when the roller 4 contacts the rotary table 3.

<Second Embodiment>
FIG. 3 is a diagram showing the configuration of the gap adjusting device in the second embodiment of the vertical mill according to the present invention.

Hereinafter, the second embodiment will be described with reference to FIG. Note that matters not described below are the same as those in the first embodiment or the modified example thereof unless there is a particular contradiction, and parts other than the gap adjusting device shown in FIG. 3 are shown in FIG. It is the same as a conventional vertical mill.

Similar to the first embodiment, the vertical mill of the second embodiment includes a casing 2, a rotary table 3 that is disposed inside the casing 2 and rotates by stacking objects to be crushed, and an upper part of the rotary table 3. And a gap adjusting device 5 that raises and lowers the roller 4 and adjusts the gap between the roller 4 and the rotary table 3.

The configuration, action, and function of the hydraulic cylinder 6 are the same as in the first embodiment.

As shown in FIG. 3, the stopper 14 is positioned while a female screw 15 formed in a lower portion of the cover 30, a push bolt 16 screwed into the female screw 15, and a linear movement of the push bolt 14 by rotating the push bolt 14. And a servo motor 21 for The servo motor 21 is controlled by the servo control unit 36. The piston rod 19 is moved forward by the hydraulic cylinder 6 to swing the roller support member 7 downward, and the contact portion 18 disposed at the lower portion of the roller support member 7 is disposed at the distal end portion of the push bolt 16. The lowering of the roller 4 is restricted by contacting the pressure receiving portion 17.

The position of the pressure receiving portion 17 is positioned at a position where the gap between the roller 4 and the rotary table 3 becomes the minimum gap by rotating the push bolt 16 by the servo motor 21 and moving the push bolt 16 back and forth.

Servo motor 21 has an electromagnetic brake, and after being positioned at a position where the gap between roller 4 and rotary table 3 is the minimum gap, the electromagnetic brake is operated to lock push bolt 16 so as not to move forward and backward.

Also in the second embodiment, as in the first embodiment, in the state where the inside of the casing 2 is isolated from the outside air without opening the cover 30, the contact of the roller 4 with the rotary table 3 is detected, The minimum gap between the roller 4 and the rotary table 3 is set on the basis of the detected position where the roller 4 and the rotary table 3 are in contact with each other.

Hereinafter, a method of (re) setting the minimum gap in the second embodiment will be described.

First, the supply of hydraulic oil to the hydraulic cylinder 6 is stopped, the switching valve 23 is opened, and the cylinder chambers on both sides of the piston of the hydraulic cylinder 6 are connected via a supply line 33 and a supply line 34. To do. Thereby, when a load acts on the piston rod 19 in the axial direction, the hydraulic oil can freely flow between the cylinder chambers on both sides of the piston of the hydraulic cylinder 6, and the piston rod 19 freely moves in the load acting direction. can do.

Next, when the servo motor 21 is operated and the push bolt 16 is moved backward, the roller support member 7 is applied with an acting force (moment) that swings downward due to the weight of the roller 4 and the roller support member 7 itself. Accordingly, the piston rod 19 moves forward freely without restriction, so that the roller support member 7 is in contact with the pressure receiving portion 17 following the backward movement of the pressure receiving portion 17 of the push bolt 16. 7 swings downward.

When the roller support member 7 swings downward and the roller 4 comes into contact with the rotary table 3, the roller support member 7 stops swinging downward, and the contact portion 18 is connected to the pressure receiving portion 17. Since it cannot follow the movement and is separated from the pressure receiving portion 17, load loads such as the roller support member 7 and the roller 4 acting on the push bolt 16 do not act. For this reason, when the load torque acting on the servomotor 21 is drastically reduced, the operating current of the servomotor 21 is greatly reduced.

Therefore, the operating current of the servo motor 21 is measured by the ammeter 37, and it can be detected that the roller 4 is in contact with the rotary table 3 by the change (decrease) in the measured operating current.

Specifically, in consideration of pulsation and the like, a predetermined threshold value (for example, 5% to 10%) with respect to a current value when the contact portion 18 contacts the pressure receiving portion 17 and the push bolt 16 moves backward. It is assumed that the roller 4 is in contact with the rotary table 3 when the current decreases. The information necessary for setting the minimum gap is the swing angle of the roller support member 7 when the roller 4 comes into contact with the rotary table 3. When the roller 4 comes into contact with the rotary table 3, the subsequent swing is performed. Since the angle is constant, the swing angle can be accurately obtained even if there is some error in the measurement of the contact time between the roller 4 and the rotary table 3.

The swing angle acquired by the swing angle acquisition unit 27 based on the current value measured (acquired) by the ammeter 37 and the angle signal measured by the angle sensor 8 is transmitted to the signal processing unit 26, and the method described above. Thus, the swing angle when the roller 4 comes into contact with the rotary table 3 is obtained and stored in the storage unit 25.

Then, a command is given from the signal processing unit 26 to the hydraulic control device 20 so that the piston rod 19 moves backward by the distance calculated as described above, and the piston rod 19 moves backward and the roller 4 moves to the rotary table 3. Ascend to a position separated by the minimum gap and stop.

Thereafter, the servo motor 21 is operated to advance the push bolt 16 so that the pressure receiving portion 17 at the tip is brought into contact with the contact portion 18 of the roller support member 7, and then the electromagnetic brake of the electromagnetic servo motor 21 is performed by the servo control unit 36. Is operated to fix the push bolt 16.

(1) Modification 1
As a modification of the method of (re) setting the minimized gap in the second embodiment (hereinafter referred to as “basic example of the second embodiment”), a method described below (hereinafter referred to as “second The minimum gap can also be set according to “Modification 1 of the embodiment”. Note that items that are not particularly described below are the same as those in the basic example of the second embodiment unless there is a contradiction or the like.

First, as in the basic example of the second embodiment, the supply of hydraulic oil to the hydraulic cylinder 6 is stopped, the switching valve 23 is opened, and the cylinder chambers on both sides of the piston of the hydraulic cylinder 6 are connected to the supply pipe. It connects via the path | route 33 and the supply pipeline 34. FIG.

Next, the servo motor 21 is operated to move the push bolt 16 backward, and the contact portion 18 of the roller support member 7 follows the backward movement of the pressure receiving portion 17 of the push bolt 16 and is in contact with the pressure receiving portion 17. The roller support member 7 is swung downward.

When the roller support member 7 swings downward and the roller 4 contacts the rotary table 3, the roller support member 7 stops swinging downward and the contact portion 18 moves the pressure receiving portion 17. Accordingly, the roller support member 7 stops swinging downward even though the push bolt 16 is moving backward.

Therefore, the change of the swing angle of the roller support member 7 is measured by the angle sensor 8, and it is detected that the roller 4 is in contact with the rotary table 3 when the swing angle is constant without changing. Can do.

Thereafter, the servo motor 21 is operated to advance the push bolt 16 so that the pressure receiving portion 17 at the tip is brought into contact with the contact portion 18 of the roller support member 7, and then the electromagnetic brake of the servo motor 21 is operated to operate the push bolt 16. To fix.

(2) Modification 2
As a modification of the basic example of the second embodiment, the minimum gap can also be set by a method described below (hereinafter referred to as “modification 2 of the second embodiment”). Note that items that are not particularly described below are the same as those in the basic example of the second embodiment unless there is a contradiction or the like.

The second modification of the second embodiment further includes a motor ammeter (not shown) that measures the motor current of the electric motor that rotates the electric motor (not shown) that drives the rotary table 3, and is the second embodiment. Instead of the change in the hydraulic pressure of the hydraulic cylinder 6 in the basic example of the embodiment, it is detected that the roller 4 has come into contact with the turntable 3 based on the change in the motor current measured by the motor ammeter.

Hereinafter, after the operation of the vertical mill, such as a method of (re) setting the distance between the roller 4 and the rotary table 3 in the modified example 2 to the minimum gap, the roller 4 and the rotary table 3 A method of (re-) setting the interval to the minimum gap will be described.

Next, the rotary table 3 is rotated and the servo motor 21 is operated to move the push bolt 16 backward, so that the abutting portion 18 of the roller support member 7 follows the backward movement of the pressure receiving portion 17 of the push bolt 16 and receives the pressure receiving portion. The roller support member 7 is swung downward in a state where the roller support member 7 is in contact with the roller 17.

When the roller 4 comes into contact with the rotary table 3, thereafter, the pressure receiving portion 17 at the tip of the push bolt 16 of the servo motor 21 is separated from the contact portion 18, and the load of the roller 4 and the roller support member 7 is received by the rotary table 3. Therefore, the load torque for rotating the turntable 3 is greatly increased, and thereby the motor current of the electric motor that rotationally drives the turntable 3 is greatly increased. By utilizing this action, in the second modification, the motor current of the electric motor that rotationally drives the rotary table 3 is monitored, and the contact of the roller 4 with the rotary table 3 is detected by its increase.

Here, when the roller 4 comes into contact with the rotary table 3, the roller support member 7 does not further swing downward, and the swing angle becomes constant. Therefore, considering the pulsation of the motor current, for example, By using the swing angle measured by the angle sensor when a predetermined threshold value (for example, 5% to 10%) increases with respect to the motor current value before the roller 4 contacts the rotary table 3. An accurate swing angle can be automatically acquired.

Thereafter, the servo motor 21 is operated to advance the push bolt 16 so that the pressure receiving portion 17 at the tip is brought into contact with the contact portion 18 of the roller support member 7, and then the servo motor 21 is prevented from moving forward and backward. The electromagnetic brake is operated to fix the push bolt 16.

In the second embodiment and each modification described above, the roller support member 7 is connected to the tip of the piston rod 19, but instead of this configuration, the tip of the piston rod 19 is roller-supported. It can also be set as the structure contact | abutted to the member 7. FIG. Even in such a configuration in which the piston rod 19 and the roller support member 7 are not connected, the roller 4 can be driven up and down during gap adjustment by driving the servo motor 21 to drive the pressure receiving portion 17 forward and backward.

Here, the forward / backward movement amount of the servo motor 21 can be calculated from the rotation angle of the servo motor 21 and the screw pitch.

Further, the roller 4 may be driven up and down by directly driving the roller support shaft with a motor or the like.

Also, instead of the screw-shaped push bolt 14 and the servo motor 21, a straight-shaped push bolt and a hydraulic cylinder can be adopted instead of the screw shape.

When the turntable 3 has a wear amount distribution in the circumferential direction or when the roller 4 has a wear amount distribution along the outer periphery, the pressing force of the turntable by the roller 4 varies accordingly. The motor current of the electric motor that rotationally drives the rotary table 3 fluctuates due to fluctuations in the load torque for rotating the rotary table 3.

Therefore, in the first embodiment described above and the modification thereof, and in the second embodiment described above and the modification thereof, the distribution of the wear amount in the circumferential direction of the rotary table 3 or the roller from the fluctuation state of the motor current. The distribution of the amount of wear along the outer periphery of 4 can be estimated.

With the roller 4 placed on the rotary table 3, the rotary table 3 is rotated by an inching motor or the like, and the position where the roller 4 is most raised is set to the zero point, so that the roller 4 and the rotary table 3 are in contact with each other (metal Setting to the original zero point without touching is possible.

Also, by detecting the load on the rotary table 3, if the amount of wear of the single rotary table 3 and the roller 4 are placed on the rotary table 3, the amount of wear of the roller 4 can also be detected, and the part replacement time can be predicted.

For the detection of the road surface state of the rotary table 3 described above, instead of measuring the motor current, or in addition to measuring the motor current, the swing angle of the roller support member 7 or the front end portion is connected to the roller support member 7. Or you may make it detect a road surface state based on the moving amount | distance of the piston rod of the hydraulic cylinder 6 to contact | abut.

In the first embodiment described above and the modification thereof, and in the second embodiment described above and the modification thereof, the gap adjusting device 5 detects that the descending roller 4 is in contact with the rotary table 3. However, when the road surface state is detected by rotating the rotary table 3 as described above, it is not always necessary to detect the contact point between the roller 4 and the rotary table 3. For example, the rotary table 3 When the roller is rotated, the position where the roller 4 is most raised can be set to the zero point.

DESCRIPTION OF SYMBOLS 1 Vertical mill 2 Casing 3 Rotary table 4 Roller 5 Gap adjustment apparatus 6 Hydraulic cylinder 7 Roller support member 8 Angle sensor 10 Support shaft 14 Stopper 15 Female screw 16 Push bolt 17 Pressure receiving part 18 Contact part 19 Piston rod 20 Hydraulic control device 21 Servo motor (or hydraulic cylinder)
22 Hydraulic pump 23 Switching valve 24 Pressure sensor 25 Storage unit 26 Signal processing unit 27 Swing angle calculation acquisition unit 28 Control device 29 of the gap adjusting device Flow control valve 30 Cover 31 Mounting bolt 32 Gate valve 33 Cylinder chamber on the rear side of the piston Supply line 34 to the supply pipe 35 to the cylinder chamber on the front side of the piston Fixing nut 36 Servo controller 37 Ammeter

Claims

A casing, a rotary table disposed in the casing, a roller disposed above the rotary table, and a gap adjusting device for adjusting a gap between the roller and the rotary table,
The gap adjusting device is configured to detect that the roller and the rotary table are in contact with each other and adjust the gap between the roller and the rotary table on the basis of the state at the time of contact detection. , Vertical mill.
The gap adjusting device has a hydraulic cylinder for driving the roller up and down, and the roller is operated based on a change in hydraulic pressure of the hydraulic cylinder when the hydraulic cylinder is operated to lower the roller. The vertical mill according to claim 1, wherein the vertical mill is configured to detect contact with the rotary table.
The gap adjusting device has a roller support member for swingably supporting the roller. Based on a change in the swing angle of the roller support member when the roller is lowered, the roller is The vertical mill according to claim 1, wherein the vertical mill is configured to detect contact with the rotary table.
The gap adjusting device has a current acquisition means for acquiring a drive current of an electric motor that drives the rotary table, and based on a change in the drive current of the electric motor when the roller is lowered, The vertical mill according to any one of claims 1 to 3, wherein the vertical mill is configured to detect that a roller contacts the rotary table.
Load acquisition means for acquiring a load acting on the rotary table is provided in the rotary table, and based on a change in the load acquired by the load acquisition means when the roller is lowered, the roller is The vertical mill according to any one of claims 1 to 4, wherein the vertical mill is configured to detect contact with the rotary table.
The gap adjusting device has a minimum gap limiting means for limiting the roller from approaching the rotary table beyond a predetermined minimum gap,
The minimum gap limiting unit is configured to detect that the roller and the rotary table are in contact with each other, and to set the minimum gap on the basis of a state at the time of contact detection. The vertical mill according to any one of 5.
The gap adjusting device has a roller support member for swingably supporting the roller,
The minimum gap limiting means has a pressure receiving portion that is in contact with the roller support member, and a servo motor for driving the pressure receiving portion forward and backward, and the pressure receiving portion is in contact with the roller support member. Detecting that the roller is in contact with the rotary table based on a change in the drive current of the servo motor when the servo motor is driven and the pressure receiving unit is moved backward to lower the roller. The vertical mill according to claim 6, wherein the vertical mill is configured to.
A cylinder having a piston rod whose tip is connected or abutted to the roller support member, and is configured to press the roller support member by the piston rod to press the roller toward the rotary table; The vertical mill according to claim 7.
The scissors according to any one of claims 1 to 8, further comprising detection means for detecting the road surface state of the rotary table by rotating the rotary table in a state where the roller is in contact with the rotary table. Mold mill.
The vertical mill according to claim 9, wherein the detection means is configured to detect a position where the roller is most raised when the rotary table is rotated.
The detection means is based on a swing angle of a roller support member for swingably supporting the roller or a movement amount of a piston rod of a hydraulic cylinder whose tip is connected to or abuts on the roller support member. The vertical mill according to claim 9 or 10, wherein the vertical mill is configured to detect a road surface state of the rotary table.
The saddle type according to any one of claims 9 to 11, wherein the detection means is configured to detect a road surface state of the rotary table based on a drive current of an electric motor that drives the rotary table. mill.
The gap adjusting device is configured to adjust a gap between the roller and the rotary table based on a swing angle of the roller support member for swingably supporting the roller. The vertical mill as described in any one of thru | or 12.
A casing, a rotary table disposed in the casing, a roller disposed above the rotary table, and a gap adjusting device for adjusting a gap between the roller and the rotary table,
The saddle type mill, wherein the gap adjusting device includes detection means for detecting the road surface state of the rotary table by rotating the rotary table in a state where the roller is in contact with the rotary table.
The vertical mill according to claim 14, wherein the detecting means is configured to detect a position where the roller is most raised when the rotary table is rotated.
The detection means is based on a swing angle of a roller support member for swingably supporting the roller or a movement amount of a piston rod of a hydraulic cylinder whose tip is connected to or abuts on the roller support member. The vertical mill according to claim 14 or 15, wherein the vertical mill is configured to detect a road surface state of the rotary table.
The saddle type according to any one of claims 14 to 16, wherein the detection means is configured to detect a road surface state of the rotary table based on a drive current of an electric motor that drives the rotary table. mill.
The gap adjusting device is configured to adjust a gap between the roller and the rotary table based on a swing angle of the roller support member for swingably supporting the roller. The vertical mill as described in any one of thru | or 17.