JP2013087929A - Method and apparatus for monitoring piston of dry gas-holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for monitoring not only the inclination of a piston but also its eccentricity regarding a dry gas-holder.SOLUTION: The method for monitoring the piston of the dry gas-holder 1 including a cylindrical holder body 2, a small lid type piston 3 arranged in the holder body, and a seal mechanism 4 for a clearance between the piston and the holder body, includes providing the center position of the piston with an eccentric amount measuring table 5; providing the upper end of the holder body with distance meters 6 measuring, in a noncontact state, height direction distances to a plurality of other positions forming a polygon with one another including or not including the eccentric amount measuring table and its vicinity and its center position; determining the occurrence of eccentricity to the piston when a sudden change occurs to the height direction distances to the eccentric amount measuring table in the center position; and determining whether the piston is inclined based on the height direction distances to the plurality of positions forming the polygon, measured by the distance meters when there is no change or a moderate change in the height direction distances.

Description

  The present invention relates to a dry gas holder, and more particularly, to a method and apparatus for monitoring the eccentricity and tilt of a piston so as to keep the piston installed in the dry gas holder in a vertically movable manner.

  Combustible gas generated in blast furnaces, coke ovens, steel making, etc. in steelworks etc. is used as fuel in heating furnaces, etc., but the amount of generated combustible gas varies. Therefore, a gas holder with a variable storage amount is used for storing and supplying surplus flammable gas.

  Gas holders are usually classified into wet and dry types. In the case of wet gas holders, a cylindrical holder main body that extends in the vertical direction, and the water in the holder main body that can be moved up and down in the holder main body, etc. And a cup-shaped piston with a vertically long side wall immersed in the sealing liquid.The pressure of the gas stored in the piston raises and lowers the piston in the holder body to increase or decrease the storage amount. Leakage of the stored gas is prevented by moving up and down while the vertically long side wall is immersed in the sealing liquid. For this reason, the piston is structurally unlikely to be inclined because the vertically long side wall portion is supported by the holder body.

  On the other hand, in the case of a dry-type gas holder, a cylindrical holder main body that extends in the vertical direction in order to accommodate gas therein, a drop-lid piston that is disposed so as to be movable up and down in the holder main body, It has a sealing mechanism that hermetically seals the gap between the periphery and the inner peripheral surface of the holder body, and the stored amount is increased or decreased by raising and lowering the piston in the holder body due to the pressure of the gas stored in the holder body. The gas stored therein is prevented from leaking out by hermetically sealing between the peripheral edge of the piston and the inner peripheral surface of the holder body with a sealing mechanism.

  There are also wet and dry seal mechanisms for pistons of such dry gas holders, and in the wet seal mechanism, a seal liquid tank that is provided at the peripheral edge of the piston and accumulates seal liquid between the inner peripheral surface of the holder body, The bottom of the seal liquid tank is arranged so as to be movable in a liquid-tight manner, and has a sliding plate or a seal rubber that is pressed against the inner peripheral surface of the holder body and slidably contacts the inner surface of the holder body from the vicinity of the upper end thereof. The seal liquid that flows down is collected in the seal liquid tank, and a slight gap between the inner peripheral surface of the holder main body and the sliding plate or seal rubber is sealed while hermetically sealing between the peripheral edge of the piston and the inner peripheral surface of the holder main body. It flows down along the inner peripheral surface of the holder body from the gap, is collected, and is supplied again into the holder body. Some use grease instead of the sealing liquid.

  On the other hand, in the dry seal mechanism, an elastic curtain extending in the circumferential direction between the peripheral edge of the piston and the inner peripheral surface of the holder body has a U-shaped cross section with a sufficient length in the vertical direction. The U-shaped folded portion of the curtain moves as the piston moves up and down, so that the curtain seals the space between the peripheral edge of the piston and the inner peripheral surface of the main body. .

  However, in a dry gas holder, any sealing mechanism requires a certain amount of clearance between the peripheral edge of the piston and the inner peripheral surface of the holder body, and the piston does not have a vertically long side wall. The piston may tilt due to the difference in frictional force between the holder body and the inner peripheral surface between different positions in the circumferential direction of the holder. When the piston is tilted, the piston is raised and lowered. The gap between the peripheral edge of the holder and the inner peripheral surface of the holder body increases, and in the wet seal mechanism, the seal liquid moves from the raised part of the peripheral part to the lowered part and the seal liquid is insufficient at the raised part. However, there is a possibility of gas leakage, and even if grease is used in place of the sealing liquid, there is a possibility that gas leakage may occur due to insufficient grease at the large gap. There are, on the other hand, in the dry seal mechanism, partially damaged elastic body made of curtain forced to deformed excessively, there is a possibility that the gas leakage occurs from the damaged part. In any sealing mechanism, the lower part of the peripheral edge partly strongly presses the inner peripheral surface of the holder main body, so that the inner peripheral surface of the holder main body is partially damaged and gas leakage occurs from the damaged portion. there is a possibility.

  Accordingly, various types of monitoring devices for the inclination of the piston of the dry gas holder have been proposed. For example, in Patent Document 1, three or more laser type distance meters provided on the top of the holder body are used in the circumferential direction of the peripheral portion of the piston. The distance to different parts is measured, and the inclination of the piston is monitored from the measurement results and displayed on the display device. Also, for example, in Patent Document 2, the height of the liquid level of the sealing liquid in the sealing liquid tank at three or more different locations in the circumferential direction of the peripheral edge of the piston is measured, and the inclination of the piston is monitored from the measurement results. Is displayed on the display device.

JP 2006-058205 A JP 2006-275262 A

  However, since all of the conventional devices as described above display the inclination when the piston is inclined, in some cases, the inclination of the piston becomes too large, and the piston is found after the inclination is detected. It may take too much time to return to a flat state, leading to problems.

  Therefore, an object of the present invention is to provide a piston monitoring method and apparatus that advantageously solves the problems of the prior art by monitoring not only the piston inclination but also the eccentricity.

A method for monitoring a piston of a dry gas holder of the present invention that achieves the above-described object is as follows.
A cylindrical holder main body that extends in the vertical direction to contain gas therein, a drop-lid piston that can be moved up and down in the holder main body, a peripheral portion of the piston, and an inner peripheral surface of the holder main body In the method for monitoring a piston of a dry gas holder comprising a sealing mechanism for hermetically sealing a gap between
An eccentric amount measurement table having a predetermined height and a predetermined height is provided at the center position of the piston,
A height direction distance to a plurality of other positions forming a polygon with or without including the eccentricity measurement table of the center position on the piston and the vicinity thereof and the center position at the upper end of the holder body. Provide a distance meter to measure each without contact,
When a sudden change occurs in the height direction distance from the distance meter measured by the distance meter to the eccentricity measurement table at the center position, it is determined that the piston is eccentric, and the change in the height direction distance is determined. If there is no or calm, it is determined whether or not the piston is inclined based on a height direction distance from the distance meter measured by the distance meter to a plurality of positions forming the polygon. To do.

Moreover, the monitoring device for the piston of the dry gas holder of the present invention that achieves the above-mentioned object is as follows.
A cylindrical holder main body that extends in the vertical direction to contain gas therein, a drop-lid piston that can be moved up and down in the holder main body, a peripheral portion of the piston, and an inner peripheral surface of the holder main body In the piston monitoring device of the dry gas holder comprising a sealing mechanism that hermetically seals the gap between
An eccentricity measurement table having a predetermined height and a predetermined size provided on the piston;
Provided at the upper end of the holder body, the eccentricity measurement table of the center position on the piston and its vicinity, and the height to other positions that form a polygon with or without the center position A distance meter that measures the direction distance in a non-contact manner;
When a sudden change occurs in the height direction distance from the distance meter measured by the distance meter to the eccentricity measurement table at the center position, it is determined that the piston is eccentric, and the change in the height direction distance is determined. If there is no or calm, it is determined whether or not the piston is inclined based on the height direction distance from the distance meter measured by the distance meter to a plurality of positions forming the polygon, and the determination result Piston eccentric inclination determination means for outputting,
It is characterized by comprising.

  According to the method and apparatus for monitoring a piston of a dry gas holder of the present invention, the distance in the height direction from the distance meter to the eccentricity measurement table at the center position of the piston, measured by a distance meter provided at the upper end of the holder body. When a sudden change occurs in the piston, it is determined that the piston is eccentric, and if there is no change in the height direction distance or if it is gentle, a plurality of polygons are formed from the distance meter measured by the distance meter. Since it is judged whether or not the piston is tilted based on the height direction distance to the position, not only the piston tilt but also the occurrence of the piston eccentricity that may cause the piston tilt can be monitored. The occurrence of the piston tilt can be prevented in advance, and even if the piston tilt occurs, it can be dealt with promptly before it causes a problem. Here, when the distance in the height direction from the distance meter to the plurality of positions forming the polygon changes by an equal amount, it is determined that the piston is raised or lowered due to the change in the gas storage amount. be able to.

  Moreover, according to the method and apparatus for monitoring a piston of a dry gas holder of the present invention, a non-contact type distance meter for measuring the piston height is usually provided directly above the piston center position. It is possible to measure the eccentricity and inclination of the piston inexpensively and easily by simply installing a non-contact type distance meter that measures other parts of the piston at the upper end of the holder body. it can.

  In the dry gas holder piston monitoring method and apparatus according to the present invention, it is preferable that the eccentricity measurement table includes a donut-shaped one. In this way, due to the presence of a step between the eccentricity measurement table surface or the piston surface in the central hole and the eccentricity measurement table surface around the hole, the distance meter is placed on the eccentricity measurement table surface or piston surface in the central hole. The sudden distance change when moving from measurement to measurement of the eccentricity measurement table surface around the center hole is considered to be eccentricity of the piston, and the distance meter measures the eccentricity measurement table surface or piston surface in the central hole. During this time, the distance does not change or becomes gentle, and the state is considered to be the inclination of the piston, so that the inclination and eccentricity of the piston can be easily and reliably determined.

  In the dry gas holder piston monitoring method and apparatus according to the present invention, the eccentricity measurement table is a columnar or regular polygonal column having a stepped shape or a sloped shape in which the height of the surface changes in the radial direction. It is preferable that it is included. In this way, the eccentric amount of the piston can be measured stepwise or continuously on the stepped or inclined surface.

  Furthermore, in the method and apparatus for monitoring a piston of a dry gas holder according to the present invention, the eccentricity measurement table preferably includes a columnar or regular polygonal column whose surface height varies in the circumferential direction. In this way, when the distance meter moves from the measurement of the eccentricity measurement table surface or piston surface in the central hole to the measurement of the eccentricity measurement table surface around the central hole, the amount of change in the abrupt height direction distance Thus, the eccentric direction of the piston can be measured.

  In the method and apparatus for monitoring a piston of a dry gas holder according to the present invention, the distance meter measures the distance in the height direction to two positions that form the apex of a triangle together with the center position of the piston. Is preferable. In this way, since only three distance meters are required, the inclination and eccentricity of the piston can be discriminated more inexpensively.

It is a basic diagram which shows one Embodiment of the monitoring apparatus of the piston of the dry gas holder of this invention used for implementation of one Embodiment of the monitoring method of the piston of the dry gas holder of this invention with the dry gas holder of a see-through | perspective state. (A) And (b) is the perspective view and sectional drawing which show one Embodiment of the eccentric amount measurement table which can be used for the monitoring apparatus of the piston of the holder of the said embodiment. (A) And (b) is the perspective view and sectional drawing which show other one Embodiment of the eccentric amount measurement table which can be used for the monitoring apparatus of the piston of the holder of the said embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the dry gas holder piston monitoring apparatus according to the present invention, which is used for carrying out the embodiment of the dry gas holder piston monitoring method according to the present invention, together with the dry gas holder in a transparent state. FIGS. 2A and 2B are a perspective view and a cross-sectional view showing an embodiment of an eccentricity measuring table that can be used in the monitoring device for the piston of the holder of the above embodiment. Reference numeral 1 denotes a dry gas holder.

  The dry-type gas holder 1 here has a cylindrical holder body 2 extending in the vertical direction in order to accommodate the gas G therein, and a disk-shaped disk that forms a drop lid that can be moved up and down in the holder body 2. It comprises a piston 3 and a sealing mechanism 4 that hermetically seals the gap between the peripheral edge of the piston 3 and the inner peripheral surface of the holder body 2, and the holder body 2 is pressurized by the pressure of the gas G stored in the holder body 2. The amount of stored gas is increased or decreased by moving the piston 3 up and down, and the gas G to be stored leaks out by sealing the space between the peripheral edge of the piston 3 and the inner peripheral surface of the holder body 2 with a sealing mechanism 4. It is preventing. Here, the sealing mechanism 4 may be any of the dry sealing mechanism and the wet sealing mechanism described above.

  In the dry gas holder 1, in the dry gas holder piston monitoring apparatus of the present embodiment, as shown in FIG. 1, at least three positions of the piston 3 located at the center position of the piston 3 and equidistant from the center position. , For example, three positions on the seal mechanism 4 provided at the peripheral edge of the piston 3 in the illustrated example, at three positions that are equally spaced apart from each other in the circumferential direction to form a triangular apex as a polygon. An eccentricity measurement table 5 having a predetermined height is installed.

  In the piston monitoring device of the dry gas holder of the present embodiment, for example, a reference plane that passes through at least three points spaced apart from each other in the circumferential direction of the peripheral portion of the piston 3 is formed on the lower surface of the ceiling 2 a located at the upper end of the holder body 2. An initial position where the piston 3 is horizontal and the peripheral edge of the piston 3 is spaced equidistant from the inner peripheral surface of the holder body 2 in each horizontal direction, and the direction of rotation around the vertical center axis of the piston 3 is a predetermined direction. In the state where the piston 3 is present, the center position and the peripheral edge position on the piston 3 are positioned just above the total four eccentricity measurement tables 5, and the distance in the height direction to the eccentricity measurement table 5 is not contacted. For example, four laser-type distance meters 6 are installed facing downward.

  Further, in the monitoring device for pistons of the dry gas holder of the present embodiment, the output signals of the four distance meters 6 are input to a determination device 7 having, for example, a normal computer as piston eccentric inclination determination means, and the determination is made. The output signal of the device 7 is input to a display device 8 having a normal display panel, for example, and information based on the output signal of the determination device 7 is displayed on the display panel of the display device 8.

  Here, at least the eccentric amount measurement table 5 at the center position, preferably all the four eccentricity measurement tables 5 are, for example, as shown in FIG. 2, a donut-shaped upper surface 5a and the upper surface supported by the upper end portion. A substantially cylindrical side wall portion 5b and a disk-like support plate 5c that supports the lower end portion of the side wall portion. The upper surface 5a of the eccentricity measuring table 5 is, for example, The piston 3 is located parallel to the reference plane and protruding from the reference plane at a height of 300 to 600 mm, has an outer diameter of 400 to 800 mm, and has a central hole with an inner diameter of 50 to 200 mm. The support plate 5c has a thickness of 10 mm and an outer diameter of 200 mm, for example.

  Each distance meter 6 emits a laser beam directly below, and in the state where the piston 3 is in the initial position, the laser beam passes through the center of the central hole of the upper surface 5a of the eccentric amount measurement table 5 directly below, Reflected by the surface of the lower support plate 5c and received by the distance meter 6, each distance meter 6 has a phase difference between the received laser light and the reference light inside the distance meter or a time difference between the time of light emission and the time of light reception. Based on this, the distance in the height direction from the distance meter 6 to the support plate 5 c is measured, and a signal indicating the distance is input to the determination device 7.

  Thus, when the piston 3 is eccentric from the initial position in a horizontal state, when the eccentricity exceeds 50 mm, the laser light from the distance meter 6 is directly below the eccentric amount measurement table 5 at the center position of the piston 3. The distance in the height direction reflected from the upper surface 5a around the central hole of the eccentricity measurement table 5 and received by the distance meter 6 is output from the distance meter 6 to the upper surface 5a around the central hole. Therefore, it changes rapidly.

  Further, when the piston 3 is gradually inclined from the initial position, the eccentricity measurement table 5 in which the laser beam from the distance meter 6 is directly below the eccentricity measurement table 5 of any one of the four. Reflected by the surface of the support plate 5c located below the central hole of the upper surface 5a and received by the distance meter 6, the height direction distance from the distance meter 6 to the support plate 5c is measured and the height is measured. Directional distance changes gently.

  Therefore, in the dry gas holder piston monitoring device of this embodiment, the determination device 7 inputs the signals from the four distance meters 6 as described above according to the dry gas holder piston monitoring method of this embodiment. Then, the change state of these signals is examined at a predetermined interval, for example, every 10 minutes, and the distance in the height direction from the distance meter 6 measured by the four distance meters 6 to the eccentricity measurement table 5 directly below the distance meter 6 and the previous time In contrast to the measurement result, when a sudden change occurs in the height direction distance from the distance meter 6 to the eccentric amount measurement table 5 at the piston center position, it is determined that the eccentricity has occurred in the piston 3, and the distance meter If there is no change in the distance in the height direction from 6 to the eccentric amount measurement table 5 at the center of the piston, or if there is a change, the distance from the distance meter 6 measured by the distance meter 6 to the peripheral portion of the piston 3 seal Based on the height direction distance to the eccentricity measurement table 5 positions equally spaced three places each other in the circumferential direction on the structure 4, it is determined whether tilt the piston 3 occurs.

  That is, since the planes passing through the three positions respectively located at the apexes of the triangle on the seal mechanism 4 at the peripheral edge of the piston 3 coincide with the posture of the piston 3, the eccentricity measurement table 5 at the positions of these three positions. From the distance in the height direction from the distance meter 6 above to the eccentricity measurement table 5 at these three positions, it is determined whether the piston 3 is horizontal or inclined, and if it is inclined, the inclination angle and The inclination direction is found. Here, when the distance in the height direction from the distance meter 6 to the eccentricity measurement table 5 at the three positions forming the triangle is changed by an equal amount, the piston is caused by the change in the storage amount of the gas G. It can be determined that 3 is rising or falling.

  Then, the determination device 7 outputs a signal indicating the determination result and the height direction distance measured by each distance meter 6 and the tilt direction and tilt angle of the piston 3 to the display device 8. 7, the determination result indicating whether the displacement of the piston 3 is eccentric or inclined based on the output signal 7, the height direction distance measured by each distance meter 6, and the information on the inclination direction and inclination angle of the piston 3 are displayed on the display panel. .

  Therefore, according to the monitoring method and apparatus for the piston of the dry gas holder of this embodiment, the eccentric amount of the center position of the piston 3 from the distance meter 6 measured by the distance meter 6 provided at the upper end portion of the holder body 2. When a sudden change in the height direction distance to the measurement table 5 occurs, it is determined that the piston 3 is decentered. If there is no change in the height direction distance or if the change is gentle, the distance measured by the distance meter 6 is used. Since it is determined whether or not the piston 3 is inclined based on the distance in the height direction from the distance meter 6 to the eccentricity measurement table 5 at the three positions forming the triangle, not only the inclination of the piston 3 but also the piston 4 The occurrence of eccentricity of the piston 3 that can cause the inclination of the piston 3 can be monitored, and the occurrence of the inclination of the piston 3 can be prevented in advance. Ku can be quickly corresponding to the previous. Here, when the height direction distances from the distance meter 6 to the three positions forming the triangle are changed by an equal amount, the piston 3 is raised or lowered due to the change in the storage amount of the gas G. Can be determined.

  Moreover, according to the method and apparatus for monitoring a piston of the dry gas holder of the present embodiment, since the distance meter 6 is usually provided for measuring the piston height just above the center position of the piston 3, the piston 3 The eccentric amount measurement table 5 is installed at the center position of the piston 3, and the eccentric amount measurement table 5 is installed at the other three positions of the peripheral edge of the piston 3. The eccentricity and inclination of the piston 3 can be measured inexpensively and easily simply by installing the distance meter 6 for measuring the quantity measurement table 5.

  Furthermore, according to the monitoring method and apparatus for the piston of the dry gas holder of this embodiment, each eccentricity measurement table 5 has a donut shape, and therefore, the eccentricity measurement table between the center hole and the periphery of the hole is provided. Due to the presence of steps on the surfaces 5c and 5a, a gentle change in distance while the distance meter 6 measures the surface 5c of the eccentricity measurement table in the center hole is considered to be the inclination of the piston 3, and the distance meter 6 is in the center hole. Since the sudden change in distance when moving from the measurement of the eccentricity measurement table surface 5c to the measurement of the eccentricity measurement table surface 5a around the hole is considered to be the eccentricity of the piston 3, the inclination and eccentricity of the piston 3 are It can be easily and reliably determined.

  FIGS. 3A and 3B are a perspective view and a cross-sectional view showing another embodiment of an eccentricity measurement table that can be used in the method and apparatus for monitoring the piston of the holder of the above embodiment. The eccentricity measurement table 5 includes a concentric circular stepped upper surface 5a, a substantially cylindrical side wall portion 5b having the upper surface, and a disk-shaped support plate 5c that supports the lower end portion of the side wall portion. It is set as the thing which has. If the eccentric amount measurement table 5 of this embodiment is used in place of the donut-shaped eccentric amount measurement table 5 at the center position of the piston 3 in the previous embodiment, the eccentric amount of the piston 3 is stepped on the stepped upper surface 5a. Therefore, it is possible to know the state of the piston 3 in more detail. The upper surface 5a of the eccentricity measurement table 5 may be an inverted truncated cone having an inclined surface instead of a circular step shape. In this case, the eccentricity of the piston 3 can be continuously measured. Since this is possible, the state of the piston 3 can be known in more detail.

  Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described examples, and can be appropriately changed within the scope of the claims as required. The eccentric amount measurement table 5 on the seal mechanism 4 may be installed on the surface of the piston 3, and in that case, the support plate 5c may be omitted and the distance to the surface of the piston 3 may be measured. . Alternatively, the distance to the surface of the piston 3 may be directly measured without providing the eccentricity measurement table 5 except for the center position of the piston 3. Further, each eccentricity measurement table 5 may be a regular polygonal column instead of a columnar shape, and the eccentricity measurement table 5 at the center position of the piston 3 is not a donut shape but a columnar shape without a central hole. May be.

  Further, the eccentric amount measurement table 5 at the center position of the piston 3 may be a columnar or regular polygonal column whose height around the central hole changes in the circumferential direction. When the distance meter 6 moves from the measurement of the eccentricity measurement table surface or piston surface in the central hole to the measurement of the eccentricity measurement table surface around the central hole, the abrupt height direction distance change is in the eccentric direction. Accordingly, the eccentric direction of the piston 3 can be obtained from the amount of change.

  The distance meter 6 may measure the distance in the height direction to two positions that form the apex of the triangle together with the center position of the piston 3. In this way, the distance meter 6 Since only three units are required, the inclination and eccentricity of the piston 3 can be distinguished at a lower cost.

  The distance meter 6 does not use the reflection of laser light, but radiates normal light, ultrasonic waves, microwaves, or the like toward the eccentricity measurement table, and measures the time and phase difference in which the reflected light returns. Things can be used. Then, the height, size, number of arrangement, arrangement position, and the like of the eccentricity measurement table 5 can be appropriately changed according to the size of the dry gas holder 1, measurement accuracy, and the like.

  Thus, according to the method and apparatus for monitoring a piston of a dry gas holder according to the present invention, the height direction from the distance meter to the eccentricity measurement table at the center position of the piston is measured by the distance meter provided at the upper end of the holder body. When a sudden change occurs in the distance, it is determined that the piston is eccentric. If the distance in the height direction is not changed or is gentle, the polygon is formed from the distance meter measured by the distance meter. Since it is determined whether or not the piston is tilted based on the height direction distance to multiple positions, not only the piston tilt but also the occurrence of piston eccentricity that may cause the piston tilt can be monitored. Thus, it is possible to prevent the piston from being tilted, and even if the piston is tilted, it can be promptly dealt with before incurring problems.

DESCRIPTION OF SYMBOLS 1 Dry type gas holder 2 Holder main body 2a Ceiling 3 Piston 4 Seal mechanism 5 Eccentricity measurement table 5a Upper surface 5b Side wall part 5c Support plate 6 Distance meter 7 Judgment device 8 Display device G Gas

Claims (10)

A cylindrical holder main body that extends in the vertical direction to contain gas therein, a drop-lid piston that can be moved up and down in the holder main body, a peripheral portion of the piston, and an inner peripheral surface of the holder main body In the method for monitoring a piston of a dry gas holder comprising a sealing mechanism for hermetically sealing a gap between
An eccentric amount measurement table having a predetermined height and a predetermined height is provided at the center position of the piston,
A height direction distance to a plurality of other positions forming a polygon with or without including the eccentricity measurement table of the center position on the piston and the vicinity thereof and the center position at the upper end of the holder body. Provide a distance meter to measure each without contact,
When a sudden change occurs in the height direction distance from the distance meter measured by the distance meter to the eccentricity measurement table at the center position, it is determined that the piston is eccentric, and the change in the height direction distance is determined. If there is no or calm, it is determined whether or not the piston is inclined based on a height direction distance from the distance meter measured by the distance meter to a plurality of positions forming the polygon. How to monitor the piston of a dry gas holder.   2. The method of monitoring a piston of a dry gas holder according to claim 1, wherein the eccentricity measurement table includes a donut shape.   3. The dry gas holder according to claim 1, wherein the eccentricity measurement table includes a columnar or regular polygonal column having a stepped shape or a sloped shape with a surface height changing in a radial direction. Piston monitoring method.   The method for monitoring a piston of a dry gas holder according to claim 1 or 2, wherein the eccentricity measurement table includes a columnar or regular polygonal column whose surface height changes in the circumferential direction.   3. The dry gas holder piston monitoring according to claim 1, wherein the distance meter measures height direction distances to two positions forming a vertex of a triangle together with a center position of the piston. Method. A cylindrical holder main body that extends in the vertical direction to contain gas therein, a drop-lid piston that can be moved up and down in the holder main body, a peripheral portion of the piston, and an inner peripheral surface of the holder main body In the piston monitoring device of the dry gas holder comprising a sealing mechanism that hermetically seals the gap between
An eccentricity measurement table having a predetermined height and a predetermined size provided on the piston;
Provided at the upper end of the holder body, the eccentricity measurement table of the center position on the piston and its vicinity, and the height to other positions that form a polygon with or without the center position A distance meter that measures the direction distance in a non-contact manner;
When a sudden change occurs in the height direction distance from the distance meter measured by the distance meter to the eccentricity measurement table at the center position, it is determined that the piston is eccentric, and the change in the height direction distance is determined. If there is no or calm, it is determined whether or not the piston is inclined based on the height direction distance from the distance meter measured by the distance meter to a plurality of positions forming the polygon, and the determination result Piston eccentric inclination determination means for outputting,
A monitoring device for a piston of a dry gas holder, characterized by comprising:   The apparatus for monitoring a piston of a dry gas holder according to claim 6, wherein the eccentricity measurement table includes a donut-shaped table.   8. The dry gas holder according to claim 6, wherein the eccentricity measurement table includes a columnar or regular polygonal columnar shape having a stepped shape or a sloped shape whose surface height changes in the radial direction. Piston monitoring device.   8. The dry gas holder piston monitoring device according to claim 6, wherein the eccentricity measurement table includes a columnar or regular polygonal column whose surface height changes in the circumferential direction.   8. The monitoring of the piston of the dry gas holder according to claim 6 or 7, wherein the distance meter measures the height direction distance to two positions forming a vertex of a triangle together with the center position of the piston. apparatus.

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