JP2010261587A - Method and device for measuring abrasion loss of stem nut in valve drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for readily measuring the abrasion loss of a stem nut in a state in which a maintenance requiring motor-operated valve drive device is installed. <P>SOLUTION: The device includes a means for mounting a tool 34 equipped with a part for gradually changing a detected distance relative to a distance detection sensor 43 in association with the rotation of a drive sleeve 16 cooperating with the stem nut in driving the stem by reversing a driving direction of the stem after the stem is once driven in a valve opening or closing direction and with part for detecting a play component of the drive sleeve 16 provided on the axial distal end of the drive sleeve 16 cooperating with the stem nut on the distal end of the drive sleeve 16 and detecting the start of movement of the stem. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a stem nut wear amount measuring method and apparatus which can easily and accurately detect the wear amount of a stem nut in an electric valve drive device and a manual valve drive device during maintenance inspection.

A valve device equipped with an electric or manual valve drive device is usually made by screwing a brass stem nut with a female screw into a male screw cut into a steel stem connected to a valve body, The stem nut is rotated by an electric motor or a manual handle by interposing an appropriate rotation transmission mechanism in the middle to raise and lower the stem.
When the stem nut is used for a long period of time, the internal thread of the soft stem nut gradually wears. Therefore, the stem nut needs to be replaced before the internal thread reaches the wear limit. Therefore, in both electric and manual valve drive devices, the amount of wear of the stem nut must be measured during maintenance inspection.

Japanese Utility Model Publication No. 1-158861 Japanese Patent Laid-Open No. 4-296268 Japanese Patent Laid-Open No. 9-5064

Patent Document 1 discloses a technique in which the length of a stem nut is increased, a notch portion provided in a part thereof is exposed to the outside, and the degree of wear is visually observed.
This is because even if a stem nut is worn beyond the usable limit, the amount of wear is so small that it is difficult to determine accurately by visual inspection. An apparatus may be provided above, below or on the back side of a large-sized device, and in such a case, visual observation is difficult.

In Patent Document 2, the number of rotations of the worm is detected by an absolute rotary encoder, the output of the encoder when the stem passes a predetermined reference position is monitored, and the output value of the encoder that changes over time is used. Means for detecting the wear amount of the stem nut are disclosed.
This means can be effectively implemented when newly installing a motorized valve driving device, but it is difficult to incorporate it into an existing motorized valve driving device, and the whole motorized valve driving device must be replaced. The amount of wear cannot be detected unless the stem has passed a predetermined reference position. Further, it cannot be applied to a manual valve drive device.

In Patent Document 3, the driving start time of the stem nut is obtained from an acoustic signal at the time of hammer blow where the drive sleeve and the driving worm part are joined, and the time from the time until the driving of the stem is started is measured with a timer. Then, a means for measuring the amount of wear of the stem nut by comparing the length of the time with the time at the time of new setting before being worn to obtain the time when the stem nut is idling is disclosed. .
This means requires a measurement time when a motor-driven valve drive device is newly installed or a measurement time when a stem nut is replaced as a history value, and there is an individual difference for each valve drive device for obtaining an acoustic signal during hammer blow. In addition, it is not suitable for maintenance of an unknown electric valve drive device, and is not applicable to a manual valve drive device in which the drive sleeve is rotated by a manual handle because the idling time of the stem nut is unstable.

  In addition, as a conventional technique, once the worn stem nut is removed, the tooth profile is copied to an impression material (molding material) or adhesive tape, and the measured dimensions of the molded tooth profile are measured for wear. Although the amount is measured, a large amount of grease is attached to the stem nut, making it difficult to mold, and also difficult to measure accurately. Therefore, it is not reliable as maintenance inspection data, and the molded sample is stored. If this is the case, the data storage property is poor, and in particular, there is a drawback that measurement cannot be performed with the stem nut attached.

  The present invention has been made in view of the above-described problems. In maintenance inspection of an existing electric or manual valve drive device, the target valve drive can be performed without previously holding history data of the valve drive device subject to maintenance inspection. It is an object of the present invention to provide a measuring method and apparatus for easily measuring the amount of wear of a stem nut while the apparatus is installed.

According to the present invention, the above-mentioned problems are solved as follows.
(1)
A method for measuring the amount of wear of a stem nut in an electric or manual valve drive device provided with a stem nut that is screwed into a stem that opens and closes a valve body and is rotated by thrust bearings on both axial sides of the stem. ,
Once driving the stem in either direction of valve opening and closing;
Driving the stem in a direction opposite to the moving direction of the stem in the step, and detecting a reverse rotation angle of a drive sleeve that cooperates with the stem nut when the stem is driven in the reverse direction;
Similarly, detecting the axial backlash component of the drive sleeve that cooperates with the stem nut when the stem is driven in the reverse direction, detecting the movement of the stem when the stem is driven in the reverse direction,
Detecting the amount of wear of the stem nut from the detected value of the rotation angle, the detected value of the backlash component, and the detected value of the movement start.

  With such a configuration, when maintaining and inspecting the existing motorized valve driving device, the history of the motorized valve driving device that needs to be inspected is not required, and the amount of wear can be easily done without using special skills and skill in the inspection. Can be detected.

(2) In the above item (1), the step of once driving the stem in either direction of valve opening / closing is finely adjusted by the manual handle operation.

  With such a configuration, it is possible to safely detect the amount of wear during maintenance and inspection even when the power supply is shut off for safety.

(3) In the above item (1) or (2), the step of driving the stem in the direction opposite to the driving direction of the stem is adjusted at a moderate speed by a manual handle operation.

  With such a configuration, the reversing operation in the driving direction can be proceeded gently without giving an impact to the stem, the variation in the measured value is reduced, and stable measurement can be performed.

(4) In any one of the above items (1) to (3), the step of detecting the rotation angle of the drive sleeve is performed between the inclined surface of the jig fixed to the tip of the drive sleeve and the optical distance measurement sensor. By distance measurement.

  With such a configuration, the amount of wear can be easily detected without requiring special skills or skill for inspection.

(5) In any one of the above items (1) to (4), the step of detecting the rotation angle of the drive sleeve is rotation angle detection by a gyro sensor fixed to a manual handle for rotating the drive sleeve.

  With such a configuration, the stem exposed in the vicinity of the gland packing portion can be relatively easily accessed, so that the workability of maintenance inspection is improved.

(6) In any one of the above items (1) to (5), the step of detecting the movement of the stem is based on a distance measurement between the reflector fixed to the exposed portion of the stem and the optical distance measurement sensor.

  With such a configuration, as a signal processing means, a general-purpose linear amplifier, a general-purpose data logger, a general-purpose waveform plotter, etc. can be easily configured, and an expensive system that performs special programs or advanced processing can be used. The wear amount can be detected inexpensively with an easy processing system.

(7) In any one of the above items (1) to (6), the step of detecting the wear amount of the stem nut from the detected value of the rotation angle, the detected value of the backlash component, and the detected value of the movement start The values are plotted on the common elapsed time axis, and the tooth surface is switched based on the point where any value shows a characteristic change, the backlash in the axial direction of the drive sleeve, the drive Find from the idling section of the sleeve.

  With such a configuration, after each detection value is recorded in the digital memory, the calculation in step 5 can be easily performed from a time stamp indicating a common elapsed time.

(8) In the above item (7), the value including the backlash component corresponding to the rotation angle of the drive sleeve is detected in advance along the common elapsed time axis, and the value not including the rotation angle in the backlash component and the time axis The detected values of the tooth surface switching, the backlash absorption in the axial direction of the drive sleeve, and the idling section of the drive sleeve are obtained.

  With such a configuration, the operation of detecting the rotation angle of the drive sleeve and the operation of detecting the mold component can be performed separately in different time zones, and the detection sensor can be used in common. It is possible to reduce the number and the number of expensive detection sensors.

(9) In a valve drive device including a stem nut that is screwed into a stem that opens and closes a valve body and is rotated by thrust bearings on both axial sides of the stem.
Once the stem is driven in either the valve opening / closing direction, the stem driving direction is reversed in the reverse direction, and when the stem is driven, the idle movement section of the drive sleeve that cooperates with the stem nut is detected. A sensor,
A drive sleeve movement amount detecting means for detecting a movement amount of the drive sleeve in the axial direction in the idling section of the drive sleeve;
Similarly, in the idling section of the drive sleeve, drive sleeve rotation amount detection means for detecting the rotation amount of the drive sleeve in the rotation direction;
The amount of wear of the stem nut is detected from the amount of axial movement and the amount of rotation of the drive sleeve in the idling section of the drive sleeve.

  With such a configuration, when maintaining and inspecting the existing motorized valve driving device, the history of the motorized valve driving device that needs to be inspected is not required, and the amount of wear can be easily done without using special skills and skill in the inspection. Can be detected. In addition, the equipment required for the inspection can be made inexpensively with general-purpose equipment without special equipment.

(10) In the above item (9), the part where the detection distance is gradually changed with respect to the distance detection sensor is an inclined surface obtained by obliquely cutting a cylindrical upper surface extending in the axial direction of the drive sleeve.

  With such a configuration, a space directly above the stem having a relatively large free space can be used.

(11) In the above item (9), the part that gradually changes the detection distance with respect to the distance detection sensor has a constant increase rate of the diameter per angle in the radial direction perpendicular to the axial direction of the drive sleeve, This is a surface having a spiral diameter in the circumferential direction.

  With such a configuration, when there is no space for installing inspection equipment above the stem in the axial direction, the optical distance detection sensor can be installed on the side perpendicular to the axis of the stem.

(12) In the above item (9), the part for detecting the backlash component forms a plane orthogonal to the axis of the stem nut.

  With such a configuration, since the small backlash component of the drive sleeve uses a plane orthogonal to the backlash vector as a part for detecting the backlash component, the noise ratio is increased and the backlash component is highly sensitive. Can be detected.

(13) In the above items (11) and (12), an inclined surface part for gradually changing the detection distance with respect to the distance detection sensor and a flat part for detecting the backlash component are attached to the upper end of the drive sleeve so as to be removable. A measurement jig was used.

  With such a configuration, preparation for measurement is simplified, and measurement errors and individual differences among workers are less likely to appear in the detection result, so that highly reliable and stable inspection can be performed.

(14) In the above item (13), the inclined surface portion for gradually changing the detection distance in the wear amount measuring jig and the flat surface portion for detecting the backlash component can be detachably attached to each other and attached to and detached from the upper end of the drive sleeve. A free wear amount measuring jig was used.

  With such a configuration, it is possible to flexibly respond to the specifications and shape of the valve drive device to be measured, and it is possible to quickly perform an optimal inspection from several measurement conditions according to the on-site situation. .

According to the present invention, in maintenance and inspection of an existing motorized valve driving device, the wear of the stem nut remains in the installed state of the target motorized valve driving device without previously holding history data of the motorized valve driving device subject to maintenance and inspection. The amount can be easily measured, and the amount of wear can be easily detected without requiring special skill or skill for inspection.
In addition, as a signal processing means, it can be easily configured with a general-purpose linear amplifier, a general-purpose data logger, a general-purpose waveform plotter, etc., and does not require a special program or an expensive system for advanced processing, making it easy Wear amount can be detected at low cost with a simple processing system.

It is an external appearance perspective view which cuts and shows the drive part periphery of the stem upper end in the upper part of the electrically driven valve drive device for demonstrating the principal part structure of this invention. FIG. 2 shows an example of an implementation procedure of the present invention, in which a stem is driven in a state in which a wear amount measuring jig used exclusively for carrying out the present invention is mounted above the motor-operated valve driving apparatus shown in FIG. It is a longitudinal cross-sectional view of a drive unit. It is an external appearance perspective view which shows an example of the wear amount measuring jig used exclusively for implementation of this invention. FIG. 4 is a stem upper-part main part cutaway view showing an example of an implementation procedure for detecting the amount of wear of the stem using the wear amount measuring jig shown in FIG. 3. It is a perspective view of the gland packing part which shows the point which detects the movement of a stem which shows an example of the implementation point of this invention. Based on the implementation procedure shown in FIGS. 2 to 5, the measurement data of each optical distance measuring sensor when the drive sleeve is once rotated in the valve opening direction and then the drive sleeve is reversely rotated to close the time axis. It is the graph represented above. Similarly, the graph shows the measurement data of each optical distance measurement sensor on the time axis when the drive sleeve is once rotated in the valve closing direction and then the drive sleeve is reversely rotated and opened. It is a stem upper part principal part fracture | rupture figure similar to FIG. 4 which shows another implementation point. It is an external appearance perspective view which shows another embodiment of the abrasion measurement jig | tool used exclusively for implementation of this invention. It is an external appearance disassembled perspective view of the abrasion measurement jig | tool used for another implementation of this invention. It is a perspective view which cuts and shows a part of manual-type valve drive device used for implementation of this invention. FIG. 12 is an upper longitudinal sectional view of the manual valve drive device showing the point of implementation of the present invention by applying the wear measuring jig shown in FIG. 10 to the manual valve drive device of FIG. 11. Similarly, the wear measuring jig shown in FIG. 10 is applied to the manual valve drive device shown in FIG. 11 to show the upper point of the manual valve drive device. 13 is a graph showing measurement data of each optical distance measurement sensor measured in the state of FIG. 12 on a time axis. It is the graph which represented on the time-axis the measurement data of each optical distance measurement sensor measured in the state of FIG. The measurement data of each optical distance measurement sensor measured in the state of FIG. 12 and the measurement data of the optical gyro rotational angle detection sensor provided on the manual handle indicated by the phantom line in FIG. 11 are superimposed on the time axis. It is a graph. It is a side view of another manual type valve drive device which shows another point of implementation of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an external perspective view showing the periphery of a drive unit at the upper end of a stem 2 in the upper part of an electric motor-driven valve drive device 1.

  The electric valve driving device 1 drives the valve body 4 in the valve device 3 provided below to move up and down to control the opening and closing of the valve device 3.

  Above the valve body 4, a stem 2 for driving the valve body 4 up and down is connected, and the upper end of the stem 2 has a gland packing portion 6 that tightly blocks the valve chamber 5 of the valve device 3 from the outside. It passes and extends above the valve device 3.

  A gland packing presser 7 is provided in the upper gland packing portion 6 of the valve device 3, and a gland packing (not shown) is pressed around the stem 2 extending from the valve chamber 5.

  When the valve body 4 is opened and closed, the portion of the stem 2 that moves up and down and is in sliding contact with the gland packing has the same shaft diameter, and when the valve body 4 is lowered and the valve device 3 is closed, A male screw 8 that drives the stem 2 up and down is screwed in the portion of the stem 2 that is slightly above the gland packing presser 7.

  An electric drive unit 9 that drives the stem 2 up and down is provided on the upper part of the valve device 3 in which the stem 2 extends upward.

  The valve device 3 and the electric drive unit 9 are firmly connected with the connection support 10 interposed therebetween.

  The electric drive unit 9 includes a drive shaft 12 that is driven in both forward and reverse directions by an electric motor 11 perpendicular to the axis of the stem 2.

  At the portion where the drive shaft 12 and the stem 2 are orthogonal, a worm 13 is provided on the drive shaft 12, and a worm wheel 14 that meshes with the worm 13 is provided around the axis of the stem 2.

  The worm wheel 14 is freely loosely fitted to a drive sleeve 16 in a stem drive unit 15 formed around the axis of the stem 2 and can be engaged in both forward and reverse rotation directions with a desired free rotation angle. It is attached to the shaft.

  The stem drive unit 15 is provided with a thrust radial bearing 17 that is controlled to receive a downward load on the lower end of the drive sleeve 16 and a thrust that is controlled to receive an upward load on the upper end of the drive sleeve 16. Radial bearings 18 are pivotally attached to the casing 19 of the electric drive unit 9, respectively.

  The upper thrust radial bearing 18 is mounted on an end cap 21 fitted into the opening 20 of the casing 19 from above and fixed to the casing 19 after the components of the stem drive unit 15 are mounted on the shaft.

  A stem 2 having a smaller diameter than the inner diameter of the inner lumen 16 a is inserted into the inner lumen 16 a of the drive sleeve 16, and a stem nut 22 is provided between the inner lumen 16 a and the stem 2.

  In the lumen 16a of the drive sleeve 16, a spline 23 is engraved upward from a position of about 1/3 of the total length upward from the lower end, and the lumen is formed in the upper opening end. The female screw 24 is screwed by slightly expanding the diameter of 16a.

  A male spline 25 is provided on the outer periphery of the lower end of the stem nut 22 so as to be joined to a female spline 23 provided in the inner cavity 16 a of the drive sleeve 16, and is engaged with the drive sleeve 16 in a non-rotatable manner.

  The upper end of the stem nut 22 is slightly shorter than the upper end of the drive sleeve 16, and a lock nut 26 that is screwed into the female screw 24 provided in the upper end lumen 16 a of the drive sleeve 16 is screwed into the stepped portion. The upward movement of the stem nut 22 is restricted, whereby the drive sleeve 16 and the stem nut 22 are firmly integrated and fixed.

  A female screw 27 that is screwed into the male screw 8 of the stem 2 is formed in the inner cavity of the lower half of the stem nut 22.

  A worm wheel 14 is rotatably fitted on the outer periphery of the drive sleeve 16 at the center of the drive sleeve 16, and the upper end of the worm wheel 14 is protruded on the outer periphery of the drive sleeve 16. The upper end of the worm wheel 14 is restricted, and the outer circumference of the lower end of the drive sleeve 16 is reduced in accordance with the lower surface 29 of the worm wheel 14, and the sleeve 31 is fitted to the reduced diameter step portion 16d. The lower end of the sleeve 31 is in contact with the upper end of the inner 30 of the thrust radial bearing 17 to restrict the downward movement of the drive sleeve 16.

  The engagement protrusions 16c provided on the drive sleeve 16 are intermittently formed on the upper surface of the worm wheel 14 with a pair of engagement protrusions 14a provided so as to sandwich the engagement protrusions 16c. The rotation of the worm wheel 14 and the drive sleeve 16 is transmitted by abutting the hammer blow.

  The upper end of the sleeve 31 is in contact with the reduced diameter step portion 16d of the drive sleeve 16 and supports the lower surface of the worm wheel 14 to restrict downward movement.

  The outer upper end portion of the drive sleeve 16 abuts the inner diameter 32 of the upper radial thrust bearing 18 from the lower side, thereby restricting the upward movement of the drive sleeve 16.

  As a result, the drive sleeve 16 is sandwiched between the inners 30 and 32 of the upper and lower radial bearings 17 and 18, and the movement of the drive sleeve 16 in both directions is restricted. If strictly regulated, the driving operation of the stem driving unit 15 may be troubled, unexpected parts may be worn out, or irregular noise may be generated.

  Therefore, the drive sleeve 16 is mounted while allowing an appropriate movement in the vertical direction, and this movement amount is commonly referred to as looseness.

  The backlash of the drive sleeve varies greatly depending on the wear of each component, etc., when the electric drive unit 9 is newly installed and after a long-term use. The degree of the drive sleeve has a value inherent to the electric drive unit 9 and is estimated and predicted. It is an impossible value.

  The present invention provides a method and apparatus for measuring the amount of wear of the female thread 27 in the stem nut 22 by accurately correcting the play value of the drive sleeve.

  In carrying out the present invention, the wear amount measuring jig 34 of the stem nut 22 is attached to the upper end 16 b of the drive sleeve 16.

  As shown in FIGS. 2 and 3, the wear amount measuring jig 34 includes a cylindrical portion 36 provided with an inclined surface 35 in the upper end circumferential direction, a flange 38 provided with an upward horizontal surface 37 at the lower end of the cylindrical portion 36, The cylindrical portion 36 has the same axis as the cylindrical portion 39 provided on the lower surface of the flange 38, the positioning engagement protrusion 40 protruding around the inner cavity of the cylindrical portion 39, and the jig embedded in the lower surface of the cylindrical portion 39. It consists of a permanent magnet 41 for fixture.

  The wear amount measuring jig 34 has a positioning projection 40 on the lower surface with a diameter that loosely fits to the inner diameter of the lock nut 26 at the upper end of the electric drive unit 9 so as not to rattle, and is fitted into the inner cavity of the lock nut 26. Then, the upper end 16a of the drive sleeve 16 or the upper surface of the lock nut 26 is placed, and the permanent magnet 41 on the lower surface of the cylindrical portion 39 is attracted to the upper end of the lock nut 26 or the drive sleeve 16, so that the jig 34 is The drive sleeve 16 or the lock nut is fixed to the upper end of the drive sleeve 16 for use.

  At the time of installation, a tool hooking groove for rotationally screwing the lock nut 26 is provided at the upper end of the lock nut 26. Since the periphery of the groove is distorted unevenly, the distortion portion is A striking notch 42 is provided on the lower surface of the jig 34.

FIG. 4 shows a situation in which the jig 34 is attached to the upper end of the drive sleeve 16 and the amount of wear of the stem nut 22 is measured.
The optical distance measuring sensor 43 is fixed to the support arm 45 of the magnet stand 44 above the inclined surface 35 that faces upward along the axis of the cylindrical portion 36 of the jig 34 and has a constant inclination gradient (spiral pitch). Provide.

  Similarly, the optical distance measurement sensor 46 is fixed to the support arm 48 of the magnet stand 47 on the vertical line of the upward horizontal surface 37 of the flange 38 in the jig 34.

  On the other hand, in order to detect the movement of the stem 2 in the vertical axis direction where the stem 2 is exposed above the gland packing presser 7, a reflector 51 is attached to the extension rod 50 of the clamper 49 whose one end is clamped to the stem 2. The reflection surface 52 is fixed upward, and an optical distance measurement sensor 55 is fixed above the reflection surface 52 to a support arm 54 of a magnet stand 53 fixed at an appropriate place.

  As the optical distance measuring sensors 43, 46, and 55, those with high accuracy and high resolution in which the measurement light source is a laser beam and the light receiving sensor is a CCD light receiving element are suitable.

The wear detection measurement is performed by the following procedure.
Step 1
The stem 2 is temporarily driven by rotating the drive shaft 12 in the stem drive unit 15 in either the direction of opening the valve body 4 or the direction of closing the valve body 4.
The drive shaft 12 may be driven by any means, such as driving by the electric motor 11, or by manually rotating the manual handle 56 shown in FIG. A gentle driving speed by the manual handle 56 is preferable.
In step 1, the rotational position of the drive sleeve 16 is adjusted to the direction in which the drive sleeve 16 is rotated in the following procedure. That is, whether the measurement spot of the optical distance measuring sensor 43 that measures the distance of the inclined surface 35 passes through the uppermost slope 35a or the lowermost slope 35b of the inclined surface 35, and the rotation start position is to be opened from now on. Depending on whether the valve closing operation is performed, the drive sleeve 16 is stopped in accordance with the uppermost end 35a or the lowermost slope 35b.
For work including such fine adjustment, it is better to operate the manual handle 56 and rotate the drive sleeve 16 as described above.
However, it is important that the reverse operation of the drive sleeve 16 is not included in the adjustment work in Step 1.

Step 2
The stem 2 is driven in the opposite direction to the previous time, and the distance A between the inclined surface 35 and the optical distance measurement sensor 43 and the distance B between the horizontal plane 37 and the optical distance measurement sensor 46 are measured as the drive sleeve 16 rotates.

Step 3
During the continuation of the previous step 2, the distance between the reflector 51 that detects the vertical movement of the stem 2 and the optical distance measuring sensor 55 is measured.

Step 4
When a noticeable change appears in the optical distance measuring sensor 55, the driving of the stem 2 is stopped and the measurement is finished.

  FIG. 6 is a graph showing the measured data of the optical distance measuring sensors 43, 46, and 55 obtained in steps 3 and 4 after the valve opening operation in step 1 and the valve closing operation in the reverse direction in step 2. It is a thing.

  FIG. 7 is a graph showing the measured data of the optical distance measuring sensors 43, 46, and 55 obtained in steps 3 and 4 after the valve is closed once in step 1 and then opened in the opposite direction in step 2. It is a thing.

Step 5
The wear amount W (mm) of the stem nut 22 is calculated from the optical distance measurement sensors 43, 46, and 55 obtained through the above steps according to the following equation (1).
W (mm) = {C (A−B) / 360 (degrees)} × n × p (Formula 1)
Where C (degrees / mm): inclination of the spiral ring (inclined surface 35)
n: number of stem screws
P (mm): Stem screw pitch
A (mm): Measurement value
B (mm): Measurement value Stem nut wear rate R (%)
R (%) = W / (P / 2)
Judgment: If the wear is 30% or less of the tooth width, it is considered good.
: If it exceeds 30%, replace it.

  6 and 7, the output of the optical distance sensor 43 that measures the height of the slope 35 is a graph that passes through the reverse rotation start point a1, the tooth surface switching point a2, and the drive sleeve idle rotation end point a3. The output of the optical distance sensor 46 for measuring the length is a graph passing through the reverse rotation start position b1, the tooth surface switching point b2, and the drive sleeve idling end point b3. The output of the optical distance measurement sensor 55 for detecting the movement of the stem 2 is The reverse rotation start position of the sleeve 16 (the rotation start position set in step 1 and stopped in the initial state, which corresponds to a1 and b1 of the sensors 43 and 46, and the outputs of both sensors 43 and 46) Is preset at a zero value at the reverse rotation start position.) The graph passes c1 and the movement start position c3 of the stem 2.

  6 and 7, the driving direction of the stem 2 is reversed, so that the switching of the tooth surface and the appearance order of the backlash absorbing section of the drive sleeve are reversed by the self-weight of the drive sleeve 16. In the invention, this variation can be ignored and measured. Then, the tooth surface switching section and the backlash absorption section are detected as the drive sleeve idling section between the detection points c1 and c3 of the sensor 55 for detecting the stem position.

  In the present invention, by accurately detecting the idling sections c1 to c3 of the drive sleeve 16, the total of the backlash absorbing section and the tooth surface switching section can be measured, and the backlash of the drive sleeve 16 in the idling section can be measured. Is measured as the height fluctuation value of the flange 38 = B, and the rotation amount of the idling section of the drive sleeve 16 is measured as the fluctuation amount of the inclined surface 35 = A. The amount of wear on the nut can be measured.

  Although the graphs of FIGS. 6 and 7 are shown on the time axis, the time axis does not advance at regular intervals, and when the drive sleeve 16 is manually rotated, the time advance becomes uneven. . Therefore, the time axis of the graph is a graph in which the measured time is matched with each output data. Therefore, the output data of each sensor is measured with a data logger or the like and simultaneously recorded in the memory. When calculating Equation 1, step 5 may be performed after reading from the memory.

  FIG. 8 shows another implementation procedure. An optical distance measurement sensor 57 capable of setting a plurality of measurement points is provided above an inclined surface 35 facing upward along the axis of the jig 34, and a horizontal plane 37 is provided. The measurement data is the same as in FIGS. 6 and 7.

FIG. 9 shows an example of a wear amount measuring jig 58 having a shape different from that of the wear amount measuring jig 34.
The wear amount measuring jig 58 has a spiral diameter-expanded portion 59 with a constant rate of increase in diameter per angle, and an optical distance measurement sensor 61 that measures the rotation angle of the peripheral surface 60 of the diameter-expanded portion 59. Toward the surface, and used in such a way that the lateral distance perpendicular to the axis is measured.

  FIG. 10 shows another embodiment of the wear amount measuring jig 62 used exclusively in the present invention.

  Compared with the jig 34 in FIG. 3, the actually measured idling section of the drive sleeve is ½ rotation or less, so the inclined surface 63 for measuring the rotation angle is made half of the inclined surface 35 of the jig 35. Thus, the overall shape is made to be a half of a cylindrical body.

  An inclined surface portion 64 that forms the upper inclined surface 63 can be separated from a fastening portion 65 with the drive sleeve 16.

  A diameter-enlarging flange 66 is provided in the upper part of the fastening part 65, and the outer diameter of the diameter-enlarging flange 66 and the outer diameter of the sloped part 64 are made equal. 67 is provided on the lower surface of the slope portion 64 with a reduced-diameter projection 68 that fits loosely with the recess 67 so that the inclined portion 64 and the fastening portion 65 are detachably fitted together. .

  The upper surface 66a of the flange 66 is a smooth plane orthogonal to the axis of the semi-cylindrical fastening portion 65, and functions in the same manner as the horizontal portion 37 of the flange 38 of the jig 34.

  The split-type jig 62 is a molded product of synthetic resin, and an appropriate number of embedded portions embedded in the tips of the projections 68 are provided in the recesses 67 of the flange 66 in the peripheral portions where they are abutted with the tips of the projections 68 of the inclined portion 64. A permanent magnet 69 and an appropriate number of permanent magnets 70 that are attracted corresponding to each other are embedded.

  An appropriate number of permanent magnets 71 that are attracted to the upper end of the lock nut 26 or the drive sleeve are also embedded in the lower end of the fastening portion 65.

FIG. 11 shows an example of a manual valve drive device to which the present invention is applied to measure the wear amount of the stem nut.
In addition, since the part of the connection support body 10 which connects the valve apparatus 3 and the casing 19 of the stem drive unit 15 is the same as FIG. 1, FIG. 2, the same number is attached | subjected and detailed description is abbreviate | omitted.

  The mounting state of the detection sensor 55 that detects the movement of the stem 2 is also the same as that shown in FIG.

  In the use state shown in FIG. 11, the stem 2 protruding from the gland packing presser 7 passes through the center of the manual valve driving device 72 fixed to the connection support 10 at the upper part of the valve device 2, and the upper end. Extends to the stem cover 73.

  FIGS. 12 and 13 show central longitudinal sectional views of the dynamic valve drive device 72 in a state where the stem cover 73 is removed and the wear amount measurement state of the stem nut attached with the wear amount measuring jig 62 of FIG.

  FIG. 12 shows a state in which the fastening portion 65 and the slope portion 64 are combined with the wear amount measuring jig 62 shown in FIG. 10 and fastened to the upper end of the drive sleeve 16.

  FIG. 13 shows a state in which only the fastening portion 65 is fastened to the upper end of the drive sleeve 16.

  The movable valve driving device 72 is a bevel gear 74 fixed to a drive sleeve 16 pivotally supported by a pair of radial thrust bearings 17, 18, and the bevel gear 74 is engaged with the axis perpendicular to the axis, and rotated by a manual handle 75. The stem 2 is driven in the vertical direction by a small-diameter bevel gear 76 that is driven.

Since the bearing structure of the drive sleeve 16 is substantially the same as that of the electric stem drive unit 15 shown in FIG. 2, a detailed description thereof will be omitted.
FIG. 13 shows a state in which the second measurement is performed with the inclined portion 64 of the wear amount measuring jig 62 removed from the fastening portion 65 with respect to the state of FIG.

  FIG. 14 is a graph of the measured values of the sensors 43 and 55 in the state of FIG. 12 along the elapsed time of the measurement work.

  FIG. 15 is a graph of the measured values of the sensors 43 and 55 in the state of FIG. 13 along the elapsed time of the measurement work.

  At the stop points a1 and c1 determined for performing the reverse rotation of step 1 in FIG. 14 and at the stop points b1 and c1 determined for performing the reverse rotation of step 1 in FIG. Is preset to zero.

  14 and 15, the handle 75 is manually rotated, the drive sleeve 16 is rotated in the reverse rotation direction, and the reverse rotation is advanced until a characteristic change is obtained in the sensor 55. When a change that can confirm the start of movement is output to the sensor 55, the rotation may be stopped.

  As described above, in the measurement operation using the inclined portion 64 shown in FIG. 14, the output of the sensor 43 includes the value obtained by moving the drive sleeve 16 between the tooth surface switching section and the backlash absorption section in the idle rotation section of the drive sleeve = A Can be measured.

  Similarly, in the measurement work with the inclined portion 64 shown in FIG. 15 removed, a value = B corresponding to the backlash component of the drive sleeve 16 can be measured at the output of the same sensor 43 in the idling section of the drive sleeve.

  In the measured value = A and value B, only the value is applied to Equation 1 in Step 5 to calculate the wear amount of the internal thread of the stem nut 22 or to determine the use limit.

  FIG. 16 shows another implementation procedure in which the rotation angle of the idling section of the drive sleeve 16 in FIG. 14 is measured by another means without using the inclined portion 64.

  Since the inclined portion 64 is not used, the wear amount measuring jig 62 is set with the inclined portion 64 removed, as in FIG.

  In this case, the manual handle 75 and the drive sleeve 16 are directly connected to each other via the bevel gears 74 and 76, and the rotation angle of the manual handle 75 is determined by considering the gear ratio between the bevel gears 74 and 76. By measuring, the rotation angle of the idling section of the drive sleeve can be measured.

  In FIG. 11, the optical gyro sensor 77 indicated by an imaginary line is aligned with the manual handle 75 so that the angle detection direction of the gyro sensor 77 is matched so that the rotation angle around the rotation axis of the manual handle 75 can be measured. It is fixed on the handle 75.

  The gyro sensor 77 includes an angle detection probe and a control unit (not shown). The illustrated gyro sensor 77 represents an angle detection probe.

  Further, in the control unit of the gyro sensor 77, the angle detection start point can be preset, and is preset to a zero value at the reverse rotation start point a1 in FIG.

  Furthermore, depending on the ratio of the number of teeth of both the bevel gears 74 and 76, the manual handle may rotate a plurality of times within the idling section, but the gyro sensor 77 can also measure multiple rotations.

  FIG. 16 shows that the gyro sensor 77 is attached to the manual handle 75, and the inclined surface portion 64 of the wear amount measuring jig 62 is removed, and the rotation angle value of the drive sleeve 16 in the drive sleeve idling section = A in one detection operation. The graph which can detect the play value = B of the drive sleeve 16 together is shown.

  FIG. 17 is a diagram showing an example in which the present invention is applied to an electric valve driving device 79 in which a manual handle 78 is provided coaxially with the axis of the stem 2.

  With this manual rotation possible, the gyro sensor 77 is attached to the manual handle 78 and the same measurement as in FIG. 16 is performed. At this time, the stem case 73 is removed, and the wear amount measuring jig 62 is connected to the upper end of the drive sleeve by removing the inclined surface portion 64 as in FIG. 13, and the optical distance measuring sensor 43 is set. To do.

DESCRIPTION OF SYMBOLS 1 Electric valve drive device 2 Stem 3 Valve device 4 Valve body 5 Valve chamber 6 Gland packing part 7 Gland packing presser 8 Male screw 9 Electric drive unit 10 Connection support body 11 Electric motor 12 Drive shaft 13 Worm 14 Warm wheel 15 Stem drive unit 16 Drive sleeve 16a Lumen 16b Upper end 17 Thrust radial bearing 18 Thrust radial bearing 19 Casing 20 Opening 21 End cap 22 Stem nut 23 Spline 24 Female thread 25 Spline 26 Lock nut 27 Female thread 28 Step 29 Lower surface 30 Inner 31 Sleeve 32 Inner 33 Diameter expansion Step part 34 Wear amount measuring jig 35 Inclined surface 36 Cylindrical part 37 Horizontal plane 38 Flange 39 Cylindrical part 40 Engaging protrusion 41 Permanent magnet 42 Notch 43 Optical distance measuring sensor 44 Magnet stand 45 Support arm 46 Optical distance measurement sensor 47 Magnet stand 48 Arm 49 Clamper 50 Extension rod 51 Reflector 52 Reflecting surface 53 Magnet stand 54 Support arm 55 Optical distance measurement sensor 56 Manual handle 57 Optical distance measurement sensor 58 Wear amount measuring jig 59 Expanded portion 60 Peripheral surface 61 Optical distance measurement sensor 62 Wear amount measuring jig 63 Inclined surface 64 Inclined portion 65 Fastening portion 66 Expanded flange 67 Recess 68 Reduced projection 69 Permanent magnet 70 Permanent magnet 71 Permanent magnet 72 Manual valve Drive device 73 Stem cover 74 Bevel gear 75 Manual handle 76 Bevel gear 77 Gyro sensor 78 Manual handle

Claims (14)

A method for measuring the amount of wear of a stem nut in an electric or manual valve drive device provided with a stem nut that is screwed into a stem that opens and closes a valve body and is rotated by thrust bearings on both axial sides of the stem. ,
Once driving the stem in either direction of valve opening and closing;
Driving the stem in a direction opposite to the moving direction of the stem in the step, and detecting a reverse rotation angle of a drive sleeve that cooperates with the stem nut when the stem is driven in the reverse direction;
Similarly, detecting the axial backlash component of the drive sleeve that cooperates with the stem nut when the stem is driven in the reverse direction, detecting the movement of the stem when the stem is driven in the reverse direction,
Measuring the amount of wear of the stem nut in the valve drive device comprising the step of detecting the amount of wear of the stem nut from the detected value of the rotation angle, the detected value of the backlash component, and the detected value of the movement. Method.   The method for measuring a wear amount of a stem nut in a valve driving device according to claim 1, wherein in the step of driving the stem once in either direction of valve opening / closing, the starting point of the next step is finely adjusted by a manual handle operation. 3. The method for measuring a wear amount of a stem nut in a valve drive device according to claim 1, wherein the step of driving the stem in a direction opposite to the direction of driving the stem is adjusted at a moderate speed by a manual handle operation.   The stem in the valve drive device according to any one of claims 1 to 3, wherein the step of detecting the rotation angle of the drive sleeve is based on a distance measurement between the inclined surface of the jig fixed to the tip of the drive sleeve and the optical distance measurement sensor. A method for measuring the wear amount of nuts.   The amount of wear of the stem nut in the valve drive device according to any one of claims 1 to 3, wherein the step of detecting the rotation angle of the drive sleeve is detection of a rotation angle by a gyro sensor fixed to a manual handle for rotating the drive sleeve. Measuring method.   6. A method for measuring the amount of wear of a stem nut in a valve driving device according to claim 1, wherein the step of detecting the movement of the stem is performed by measuring a distance between a reflector fixed to an exposed portion of the stem and an optical distance measuring sensor. Method   The step of detecting the wear amount of the stem nut from the detected value of the rotation angle, the detected value of the backlash component, and the detected value of the movement starts by plotting the value of each detected value on the common elapsed time axis. 7. Any one of claims 1 to 6, wherein one of the values is obtained from the tooth surface change, axial backlash absorption of the drive sleeve, and the idling section of the drive sleeve, based on a point where any value shows a characteristic change. Of wear amount of stem nut in motor-driven valve drive device according to claim 1   A value including a backlash component corresponding to the rotation angle of the drive sleeve is detected in advance in accordance with a common elapsed time axis, and a value not including the rotation angle is combined with the backlash component on the time axis to switch the tooth surface, 8. The stem nut wear measuring device in a valve driving device according to claim 7, wherein the detected values of backlash absorption in the axial direction of the drive sleeve and the idling section of the drive sleeve are obtained. In a valve drive device comprising a stem nut that is screwed into a stem that opens and closes a valve body and is rotated by thrust bearings on both axial sides of the stem,
Once the stem is driven in either the valve opening / closing direction, the stem driving direction is reversed in the reverse direction, and when the stem is driven, the idle movement section of the drive sleeve that cooperates with the stem nut is detected. A sensor,
A drive sleeve movement amount detecting means for detecting a movement amount of the drive sleeve in the axial direction in the idling section of the drive sleeve;
Similarly, in the idling section of the drive sleeve, drive sleeve rotation amount detection means for detecting the rotation amount of the drive sleeve in the rotation direction;
And a stem nut wear amount measuring device in the valve drive device, wherein the wear amount of the stem nut is detected from the amount of axial movement and rotation of the drive sleeve in the idling section of the drive sleeve.   The amount of wear of the stem nut in the valve drive device according to claim 9, wherein the part where the detection distance is gradually changed with respect to the distance detection sensor is an inclined surface obtained by obliquely cutting a cylindrical upper surface extending in the axial direction of the drive sleeve. apparatus.   The part where the detection distance is gradually changed with respect to the distance detection sensor is a surface in which the increase rate of the diameter per angle is constant in the radial direction orthogonal to the axial direction of the drive sleeve and the diameter in the circumferential direction is spiral. The apparatus for measuring a wear amount of a stem nut in a valve driving device according to claim 10.   The apparatus for measuring a wear amount of a stem nut in a valve drive device according to claim 9, wherein a portion for detecting the backlash component forms a plane perpendicular to the axis of the stem nut.   13. The valve according to claim 11 or 12, wherein an inclined surface part for gradually changing a detection distance with respect to the distance detection sensor and a flat part for detecting a backlash component are used as a wear amount measuring tool which is detachably attached to an upper end of the drive sleeve. A device for measuring the wear amount of a stem nut in a drive device.   An inclined surface portion that gradually changes the detection distance in the wear amount measuring jig and a flat surface portion that detects the backlash component can be engaged with and disengaged from each other to be a wear amount measuring jig that can be attached to and detached from the upper end of the drive sleeve. The stem nut wear amount measuring device in the valve drive device according to claim 13.

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