JP2003097984A - Poppet valve-type flow rate measuring instrument and flow rate measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a poppet valve-type flow rate measuring instrument and a flow rate measuring device in which a displacement sensor is easily mounted and removed in relation to a poppet valve, and which can be used as a normal check valve and be easily changed to the normal check valve and vice versa. SOLUTION: The displacement sensor 4 is composed of a detecting rod 21, a spring 22 and three parts of a sensor main body 30, a plug-like member 31 and a lock nut 32, and a threaded portion 38 is formed on the periphery of a main spindle 35 of the sensor main body 30, and an O-ring 39 is disposed at the top portion of spindle 36. The external shape of the plug-like member 31 is identical to a general-purpose plug, and the threaded portion 31a is screwed into a threaded hole 13a formed in a back cover 13. A threaded hole 41 is formed in the plug-like member 31, and a screw portion 42 to which the threaded portion 38 on the main spindle 35 of the sensor main body 30 is engaged, is disposed. The connection of the sensor main body 30 engaging to the plug-like member 31 at the threaded portion 38 and the screw portion 42 is fixed by the lock nut 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a poppet valve type flow rate measuring device and a flow rate measuring device for measuring the flow rate of a poppet valve by measuring the displacement of the poppet valve. The present invention relates to a poppet valve type flow rate measuring device and a flow rate measuring device that can also be used as a check valve.

[0002]

2. Description of the Related Art As a prior art relating to a poppet valve type flow rate measuring device, there is a flow rate measuring device described in Japanese Patent Laid-Open No. 62-259015. This flow rate measuring device has a poppet valve arranged on the fluid flow path, and has a means for detecting the differential pressure across the poppet (poppet valve body) and a mechanism for detecting the displacement amount of the poppet (displacement detection mechanism). In addition to the provision, a calculation means for calculating the passing flow rate based on the differential pressure across the poppet and the displacement is provided. In this flow rate measuring device, the displacement detection mechanism includes a valve body side rod that moves together with the poppet, and a displacement sensor that detects the displacement of the valve body side rod, and the tip of the valve body side rod is screwed and fixed to the back center of the poppet, The other end is taken out to the outside of the main body from a through hole provided in the back cover portion of the main body, and the detection rod of the displacement sensor is screwed and fixed to the other end of the valve body side rod. The valve body side rod functions as a part of the detection rod.

[0003]

However, the above-mentioned prior art has the following problems.

First, the first problem is that the conventional poppet valve type flow rate measuring device is not compatible with a normal poppet valve (check valve) and cannot be used as a normal poppet valve (check valve). It is a structure that is difficult to do.

That is, if the poppet valve type flow rate measuring device can be used as an ordinary poppet valve (check valve), a hydraulic circuit of a certain specification is provided with a displacement sensor removed as a check valve, and the flow rate is optionally set. It can be used as a flow rate detector by attaching a displacement sensor when there is a request to detect it.
The specifications can be changed easily. Further, when the displacement sensor fails during use as a flow rate detector, the displacement sensor is removed and replaced with an ordinary poppet valve (check valve), whereby the downtime of the construction machine can be shortened.

In order to use the above-mentioned flow rate measuring device of the prior art as an ordinary poppet valve (check valve), it is necessary to remove the displacement sensor from the body of the poppet valve. However, simply removing the displacement sensor leaves the valve body side rod protruding outside the body of the poppet valve,
In construction machines such as hydraulic excavators that have a small installation space, the rod projections are an obstacle, so it is necessary to remove them. Also, in the case of construction machines such as hydraulic excavators, since the hydraulic circuit has a high pressure, hydraulic oil may leak from the gap between the through hole of the main body body rear cover and the valve body side rod. However, it is necessary to remove the rod and take a sealing measure.

However, in the above-mentioned prior art, in order to measure the displacement of the poppet, the tip of the valve body side rod is screwed and fixed to the center of the back part of the poppet, and the detection rod of the displacement sensor is screwed and fixed to the other end of the valve body side rod. Has been done. Therefore, in order to remove the rod from the poppet valve and take sealing measures, open the back cover of the body of the poppet valve, take out the rod together with the poppet, remove the rod from the poppet, and then put the poppet back into the body. After closing the rear cover part and closing the rod through hole with a plug, etc., or returning only the poppet into the main body, close the rear side of the main body using the check valve dedicated rear cover with no rod through hole. It is an indispensable and extremely difficult task.

The second problem is that it is difficult for the conventional poppet valve type flow rate measuring device to accurately adjust the initial preset position of the detection rod of the displacement sensor.

That is, it is necessary to adjust the initial preset position of the detection rod when mounting the displacement sensor.
However, in the above-mentioned conventional technology, the detection rod of the displacement sensor is screwed and fixed to the valve body side rod, and since the valve body side rod is screwed and fixed to the back part of the poppet,
The position of the detection rod cannot be adjusted after the displacement sensor is attached. Therefore, the initial preset position must be adjusted by previously adjusting the lengths of the main body side rod and the detection rod of the displacement sensor with respect to the design values of the main body of the poppet valve and the poppet. But,
In this case, the processing accuracy of the poppet valve body and poppet, the mounting accuracy by screwing and fixing the poppet and body side rod, and the body side rod and the detection rod of the displacement sensor by screwing become a problem, and it is not possible to adjust the initial preset position accurately. difficult.

A first object of the present invention is a poppet valve type flow meter which can be used as an ordinary check valve and can be easily changed to an ordinary check valve or vice versa. And a flow measuring device.

A second object of the present invention is to provide a pet valve type flow rate measuring device and a flow rate measuring device capable of accurately adjusting the initial preset position of the detection rod of the displacement sensor.

[0012]

(1) In order to achieve the above first object, the present invention provides a poppet valve type flow rate having a poppet valve and a displacement sensor for measuring the displacement of the poppet of the poppet valve. In the measuring instrument, the displacement sensor is
The sensor main body has a threaded portion formed on the outer periphery and a bolt-shaped gripping head at one end, and a screw hole with which the threaded portion of the sensor main body is engaged is formed in the back cover of the poppet valve. Is engaged and fastened to the back cover of the poppet valve by the screw portion.

Thus, the screw means of the back cover is closed and the sealing means (O-ring) of the plug is simply replaced by replacing the sensor body with a plug having the same outer shape.
Since the sealability is secured by this, the displacement sensor can be easily attached to and removed from the poppet valve, and the flow meter can also be used as an ordinary check valve. Can be easily changed or vice versa.

(2) Further, in order to achieve the first object, the present invention provides a poppet valve type flow rate measuring device having a poppet valve and a displacement sensor for measuring the displacement of the poppet of the poppet valve. The displacement sensor includes a sensor body and a plug-shaped member having the same outer shape as a general-purpose plug and incorporating the sensor body, and a screw with which the plug-shaped member engages with a back cover of the poppet valve. A hole is formed, and the plug-shaped member is screwed into a screw hole of the back cover of the poppet valve and fastened and fixed.

As a result, by simply replacing the plug-shaped member with a general-purpose plug, the screw hole of the back cover is closed and the sealing performance is secured by the sealing means (O-ring) of the general-purpose plug. Displacement sensor can be easily attached to and detached from the valve, the flow meter can be used as a normal check valve, and it is easy to change to a normal check valve or vice versa. It can be carried out. Also, since the screw holes on the back cover of the poppet valve can be closed using a general-purpose plug,
The cost of parts can be reduced.

(3) Further, in order to achieve the above first and second objects, the present invention provides a poppet valve type flow rate measurement device having a poppet valve and a displacement sensor for measuring the displacement of the poppet of the poppet valve. In the container, the displacement sensor includes a sensor main body having a threaded portion on the outer periphery and a bolt-shaped gripping head at one end, and a lock nut engaging with the threaded portion of the sensor main body. A screw hole is formed in the back cover to engage with the screw portion of the sensor body, and the sensor body is engaged with the back cover of the poppet valve with the screw portion, and the positional relationship between the sensor body and the back cover is formed. It shall be fixed with the lock nut.

As a result, as described in (1) above, the displacement sensor can be easily attached to and detached from the poppet valve, and the flow rate measuring device can be used as an ordinary check valve. Further, the change to the ordinary check valve or the reverse change can be easily performed.

The displacement sensor is composed of two parts, a sensor body and a lock nut. Since the lock nut can change the mounting position of the sensor body to the back cover of the poppet valve, the sensor can be attached to the back cover of the poppet valve. The position of the main body can be finely adjusted, whereby the initial preset position of the detection rod of the displacement sensor can be adjusted accurately.

(4) Further, in order to achieve the above first and second objects, the present invention provides a poppet valve type flow rate measurement device having a poppet valve and a displacement sensor for measuring displacement of the poppet of the poppet valve. In the device, the displacement sensor has a sensor body having a threaded portion on the outer periphery and a bolt-shaped gripping head at one end, and the same outer shape as a general-purpose plug,
And a plug-shaped member having a screw hole with which the threaded portion of the sensor body engages, and a lock nut that engages with the threaded portion of the sensor body, and the plug-shaped member engages with the back cover of the poppet valve. Forming a screw hole for engaging the sensor body with the screw hole of the plug-shaped member at the screw portion, and screwing the plug-shaped member to the screw hole of the back cover of the poppet valve, The positional relationship between the plug and the plug-shaped member is fixed by the lock nut.

With this, as described in (2) above, the displacement sensor can be easily attached to and detached from the poppet valve by using a general-purpose plug, and the flow rate measuring device can be checked normally. It can also be used as a valve and can easily be changed to a normal check valve or vice versa.

Further, the displacement sensor is composed of three parts, that is, a sensor body, a plug-shaped member and a lock nut. Since the mounting position of the sensor body on the plug-shaped member can be changed by the lock nut, the displacement sensor can be used as a poppet valve. After the mounting, the position of the sensor body can be finely adjusted with respect to the plug-shaped member, whereby the initial preset position of the detection rod of the displacement sensor can be accurately adjusted.

(5) In the above (1) to (4), preferably, a detection rod that moves together with the poppet of the poppet valve and transmits the displacement to the sensor body is further provided, and the detection rod is a spring for the poppet. Being pressed against.

As a result, it becomes easy to dispose the detection rod of the displacement sensor in contact with the poppet, and the displacement sensor can be attached to and removed from the poppet valve more easily.

(6) Further, in the above (5), preferably, the initial preset position of the detection rod corresponding to the minimum stroke of the poppet is a position slightly moved from the position where the displacement sensor output becomes the minimum, and the poppet is The movement position of the detection rod corresponding to the maximum stroke position of the poppet is restricted to the maximum movement position with respect to the sensor body, and the displacement sensor output is the minimum and maximum output of the poppet at the minimum and maximum stroke positions. Set not to become.

As a result, when the output of the displacement sensor reaches the minimum or maximum output, it can be determined that the displacement sensor has a failure, and the failure of the displacement sensor can be easily determined.

(7) In order to achieve the above first object or the first and second objects, the present invention provides the above (1).
(4) The poppet valve type flow rate measuring device and the display control means for converting the displacement measured by this measuring device into a flow rate and displaying the flow rate.

[0027]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

A first embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a poppet valve type flow rate measuring device according to the present embodiment. This flow rate measuring device 1 measures a displacement of a poppet valve 2 and a displacement of a poppet 3 of the poppet valve 2. And have.

The poppet valve 2 has a main body 10 for accommodating the poppet 3, and the main body 10 is provided with an inlet port 11 opened at one axial end and an outlet port 12 opened laterally. The inlet port 11 and the outlet port 12 are opened and closed as the poppet 3 moves up and down within the main body 10. A back cover 13 is provided on the back surface of the main body 10, and the poppet 3 is installed inside the main body 10 by opening the back cover 13. Further, the spacer 14 and the spring 15 are arranged in the main body 10,
The spacer 14 is located at the back of the poppet 3, and the spring 15 is arranged between the back cover 13 and the spacer 14, and presses the poppet 3 against the seat portion inside the main body 10 via the spacer 14 to abut.

The displacement sensor 4 is fixed to the back cover 13 of the body 10 by screws. The displacement sensor 4 has a detection rod 21, and the tip of the detection rod 21 is held in contact with the spacer 14 by a rod support spring 22. When the poppet 3 moves up and down, the detection rod 21 also moves up and down, and the displacement sensor 4 detects the displacement to detect the displacement of the poppet 3.

Details of the structure of the displacement sensor 4 will be further described with reference to FIGS.

The displacement sensor 4 is a combination of a sensor body 30, a plug-shaped member 31, a lock nut 32, a detection rod 21 and a spring 22.

The sensor main body 30 has a main shaft portion 35, a tip shaft portion 36, and a gripping head portion 37. A screw portion 38 is formed on the outer periphery of the main shaft portion 35, and the tip shaft portion 36 has a smaller diameter than the main shaft portion 35. An O-ring 39 is provided on the outer circumference. In addition, the sensor body 30 has an axial hole 4 that opens at the end face of the tip shaft portion 36.
0 is formed, and the detection rod 21 is inserted into the axial hole 40.

A spring receiver 21a is provided at the tip of the detection rod 21.
Is provided and a rod support spring 22 is disposed between the spring receiver 21a and the end surface of the sensor body 30. The rod support spring 22 presses the detection rod 21 against the spacer 4 at the back of the poppet 3. In other words, the rod support spring 22 generates a force that returns the detection rod 21 to the initial preset position, and thus the detection rod 21 follows the movement of the measurement object without being fixed to the poppet 3 that is the measurement object. The detection rod 21 can be moved as described above.

When the detection rod 21 is displaced with respect to the sensor body 30, a voltage corresponding to the displacement is applied to the harness 6
0, the displacement of the detection rod 21, and hence the displacement of the poppet 3, is measured. Since the displacement of the poppet 3 can be converted into a flow rate, the flow rate can be measured by detecting the displacement of the poppet 3 (described later).

The plug-shaped member 31 has the same outer shape as a general-purpose plug, and its screw portion 31a is screwed and fixed in a screw hole 13a formed in the rear cover 13. At this time, an O-ring 31c is provided between the screw portion 31a of the plug-shaped member 31 and the grip head 31b.
The ring 31c seals between the plug-shaped member 31 and the screw hole 13a of the rear cover 13.

A screw hole 41 is formed in the plug-shaped member 31, and the main shaft portion 3 of the sensor body 30 is inserted into the screw hole 41.
Sensor part 30 and the screw part 42 with which the screw part 38 of FIG.
And a hole portion 43 into which the tip shaft portion 36 of the above is fitted. The sensor body 30 has a tip shaft portion 36 and a main shaft portion 35.
Is inserted into the screw hole 41 of the plug-like member 31, and the screw portion 42
By rotating the screw portion 38 with respect to the plug-like member 3
1 is engaged. At this time, the O-ring 39 of the sensor body 30 comes into close contact with the hole portion 43 of the screw hole 41 to perform a sealing function.

The lock nut 32 is for fixing the connection of the sensor main body 30 which is engaged with the plug-like member 31 by the screw portions 38 and 42, and is provided between the grip head portion 37 of the sensor main body 30 and the plug-like member 31. The threaded portion 38 of the sensor body 30 is engaged.

FIG. 3 shows the structure of the displacement detecting portion of the sensor body 30. A resistor 61 and a conductor 62 are arranged in the axial hole 40 of the sensor body 30 so as to face each other over a predetermined length in the axial direction as shown in the drawing, and the tip of the detection rod 21 is in contact with the resistor 61 and the body. Moving slider 6
3 is provided. Both ends 61a and 61b of the resistor 61
A predetermined voltage is loaded from the power supply 65 via the power supply lines 64a and 64b, and the voltage between the end 61a of the resistor 61 and the slider 63 is applied by the signal line 66 connected to one end 62a of the conductor 62. It is taken out as a signal. Power line 64
The harnesses 60 take out the a and 64b and the signal line 66 to the outside.

Since the voltage between the end portion 61a of the resistor 61 and the slider 63 changes depending on the position of the slider 63, the voltage between the end portion 61a of the resistor 61 and the slider 63 is detected. The displacement of the detection rod 21 can be detected.

FIG. 4 shows the overall structure of a flow measuring device using a poppet valve type flow measuring device. The flow rate measuring device includes the poppet valve type flow rate measuring device 1 described above, the arithmetic and control unit 70, and the display unit 80. The arithmetic and control unit 70 has a displacement calculator 71, a flow rate calculator 72, and a display processor 73, and a signal (voltage) from the displacement sensor 4 of the flow rate measuring device 1 is input to the displacement calculator 71. . Here, the resistor 61 extracted from the signal line 66 which is a signal from the displacement sensor 4
The voltage between the end 61a of the rod and the slider 63 is detected by the detection rod 21
And the displacement of the poppet 3 is proportional to the displacement of the poppet 3, and the displacement of the poppet 3 is proportional to the passage flow rate of the poppet valve 2. The relationship between them is preset in the displacement calculation unit 71 and the flow rate calculation unit 72. The displacement calculation unit 71 converts the signal (voltage) from the displacement sensor 4 into the displacement of the detection rod 21, and the flow rate calculation unit 72 changes the displacement. Is further converted into the flow rate passing through the poppet valve 2. The display processing unit 73 causes the display device 80 to display the calculation result as a numerical value or an image.

The operation and advantages of this embodiment configured as described above are as follows.

First, the basic operation of the present embodiment is to detect the displacement of the poppet 3 by detecting the displacement of the detection rod 21 inserted into the axial hole 40 of the sensor body 30 as described above. That is, the flow rate passing through the valve 2 can be measured. At this time, in the mounting portion of the displacement sensor 4, pressure oil leaks from the inside of the poppet valve 2 due to the O-ring 3
It is blocked by 1c and 39, and high sealing performance can be secured.

Next, the poppet valve type flow rate measuring device 1 according to the present embodiment can be used as an ordinary poppet valve (check valve), and can be easily changed to a poppet valve.

That is, the threaded portion 31 of the plug-shaped member 31 is loosened to remove the sensor main body 30, the plug-shaped member 31, and the lock nut 32 from the rear cover 13, and the detection rod 21 and the rod support spring 22 are covered with the rear cover. By pulling out from the screw hole 13a of 13 and closing the screw hole 13a of the back cover 13 with a general-purpose plug 90 as shown in FIG. 5, the poppet valve type flow meter 1 becomes an ordinary poppet valve (check valve). Become.

At this time, the plug-shaped member 31 has the screw portion 31.
It is only screwed and fixed to the back cover 13 of the poppet valve 3 by a, and the detection rod 21 is only pressed against the poppet 3 by the rod support spring 22. Therefore, removal and detection of the plug-shaped member 31 is performed. The rod 21 and the rod support spring 22 can be easily pulled out. Moreover, since the plug-shaped member 31 has the same outer shape as a general-purpose plug, the general-purpose plug 90 can be used to close the screw hole 13a, and the screw hole 13a can be used.
The O-ring 91 is attached to the general-purpose plug 90 so that the plug 90 and the screw hole 13a can be reliably sealed like the O-ring 31c of the plug-shaped member 31. be able to.

After changing the poppet valve type flow rate measuring device 1 to a normal poppet valve (check valve) and returning it to the original flow amount measuring device, the procedure reverse to the above may be carried out. It can be changed to a detector.

Therefore, in a normal hydraulic system, if the displacement sensor 4 is removed from the poppet valve type flow rate measuring device 1 and installed as a poppet valve (check valve) with a general-purpose plug 90, it is a product option. When there is a request to detect the flow rate in the hydraulic system, the displacement sensor 4
Can be used as the poppet valve type flow meter 1, and the specifications can be easily changed.

If the displacement sensor 4 fails when it is used as the poppet valve type flow rate measuring device 1 to which the displacement sensor 4 is attached, the displacement sensor 4 may be removed and replaced with a general-purpose plug 90 to replace the ordinary poppet valve. Since it can be used as a (check valve), the stop time of the hydraulic device can be shortened.

Further, in this embodiment, the screw hole 1 of the back cover 13 of the poppet valve 2 is formed by using a general-purpose plug 90.
Since 3a can be closed, the cost of parts can be reduced, which is extremely economical.

Thirdly, the displacement sensor 4 of the flow rate measuring device 1 according to this embodiment can accurately adjust the initial preset position of the detection rod 21.

That is, the displacement sensor 4 includes the sensor body 30.
And a plug-shaped member 31 and a lock nut 32 are combined to form a screw portion 38 of the sensor body 30.
The position of the sensor body 30 and that of the poppet 3, which is the object to be measured, can be changed by rotating the plug body 31 with respect to the screw portion 42 of the plug body 31 and shifting the position of the plug body 31. Further, after the position with respect to the plug-shaped member 31 is shifted, the position of the sensor body 30 can be fixed with the lock nut 32. A detection rod 21 is arranged inside the sensor body 30, and the detection rod 21 moves when the position of the poppet 3 relative to the sensor body 30 changes, and the displacement of the poppet 3 can be measured.

Therefore, based on the design value of the poppet valve 2, the position of the sensor main body 30 with respect to the plug-shaped member 31 is preset so that the position from the lower end of the plug-shaped member 31 to the tip of the detection rod 31 has a predetermined dimension. When the displacement sensor 4 is attached, the plug-shaped member 31 is attached to the rear cover 1
After being screwed to 3, the position of the sensor main body 30 is finely adjusted with respect to the plug-shaped member 31 and fixed by the lock nut 32 at a position where a desired output is obtained, so that the initial preset position of the detection rod 21 can be accurately adjusted. It can be adjusted well.

Next, a method of setting a preferable output characteristic of the displacement sensor 4 will be described.

In this embodiment, the output characteristic of the displacement sensor 4 is set as follows. First, at the initial preset position of the detection rod 21 corresponding to the minimum stroke position (closed position) of the poppet 3, the detection rod 21 is at the sensor body 20.
A position slightly moved from the 0 point position (minimum output position) with respect to. The movement position of the detection rod 21 corresponding to the maximum stroke position of the poppet 3 regulates the stroke range of the poppet 3 so that the detection rod 21 does not reach the maximum movement position with respect to the sensor body 30. As a result, the output of the displacement sensor 4 output from the signal line 66 does not reach the minimum and maximum outputs of the displacement sensor 4 at the minimum and maximum stroke positions of the poppet 3.

FIG. 6 shows an example of setting the output characteristic of the displacement sensor 4. The displacement sensor 4 is designed so that the output from the signal line 66 is 0 V when the stroke of the detection rod 21 is 0 mm, and is 5 V when the stroke of the detection rod 21 is 20 mm. When the displacement of the poppet 3 is measured using the displacement sensor 4, the initial preset position of the detection rod 21 when the displacement sensor 4 is attached to the poppet valve 2 is 0.5 V when the detection rod 21 moves 2 mm in advance. The output of is generated. Also, the maximum displacement of the poppet 3 is 16
If mm is specified, the corresponding detection rod 2
The stroke of 1 is 18 mm, and the output of the displacement sensor 4 is 4.5V.

When the output characteristic of the displacement sensor 4 is set as described above, when the output of the displacement sensor 4 output from the signal line 66 becomes 0.5 V or less or 4.5 V or more,
It is estimated that some kind of failure has occurred in the displacement sensor 4,
It is possible to easily determine the failure of the displacement sensor 4.

A second embodiment of the present invention will be described with reference to FIG. In the figure, the same members as those shown in FIGS. 1 and 2 are designated by the same reference numerals.

In FIG. 7, the displacement sensor 4A according to the present embodiment has a sensor body 30 and a lock nut 32.
This is a combination of two parts, the detection rod 21 and the spring 22, and the sensor body 30 and the lock nut 32 are the same as those in the first embodiment. That is, in this embodiment, the plug-shaped member 31 in the first embodiment is eliminated, and the sensor body 30 is attached to the back cover 13 of the poppet valve 2.
Hole 13 for receiving the main shaft portion 35 and the tip shaft portion 36 of
A is opened, and the sensor body 30 is directly screwed to the rear cover 13 by the screw portion 42 of the screw hole 13a.

Also in the present embodiment, the sensor body 30
It is possible to detect the displacement of the poppet 3 by detecting the displacement of the detection rod 21 inserted in the axial hole 40, and to measure the passage flow rate of the poppet valve 2. At this time,
At the mounting portion of the displacement sensor 4, leakage of pressure oil from the inside of the poppet valve 2 is blocked by the O-ring 39, and high sealing performance can be secured.

Also, the poppet valve type flow rate measuring device according to the present embodiment can be used as an ordinary poppet valve (check valve), and it is easy to change to a poppet valve.

That is, the threaded portion 38 of the sensor body 30 is loosened to remove the two parts of the sensor body 30 and the lock nut 32 from the rear cover 13, and the detection rod 21 and the rod support spring 22 are inserted from the screw hole 13a of the rear cover 13. The poppet valve type flow meter becomes an ordinary poppet valve (check valve) by pulling out and closing the screw hole 13a of the back cover 13 with a plug having the same outer diameter as the sensor body 30 prepared in advance. .

After changing the poppet valve type flow rate measuring device to an ordinary poppet valve (check valve), the flow rate measuring device can be returned to the original flow amount by performing the procedure reverse to the above. Can be changed to a bowl.

Further, the displacement sensor 4 according to the present embodiment
A can also precisely adjust the initial preset position of the detection rod 21.

That is, the displacement sensor 4A includes the sensor body 3
0 and the lock nut 32 are combined, and the screw portion 38 of the sensor body 30 is attached to the rear cover 13
The position of the sensor body 30 and the position of the poppet 3, which is the object to be measured, can be changed by rotating the screw part 42 with respect to the back cover 13 to shift the position. Further, after the position of the back cover 13 is shifted, the position of the sensor body 30 can be fixed by the lock nut 32. The detection rod 21 is arranged in the sensor body 30,
By changing the position of the poppet 3 with respect to the sensor body 30, the detection rod 21 moves, and the displacement of the poppet 3 can be measured.

Therefore, when the displacement sensor 4A is attached, the position of the sensor body 30 with respect to the back cover 13 is finely adjusted and fixed by the lock nut 32 at a position where a desired output is obtained, so that the initial preset position of the detection rod 21. Can be adjusted accurately.

As described above, also in this embodiment, the displacement sensor 4A can be easily attached to and detached from the poppet valve 2, and the flow rate detector can be used as an ordinary check valve. The check valve can be changed to the check valve or vice versa. Further, as a result, it is possible to easily change the specifications of the hydraulic system and shorten the stop time of the hydraulic system when the displacement sensor fails.

Further, by using the lock nut 32, the adjustment of the initial preset position of the detection rod 21 of the displacement sensor 4A can be accurately performed on site.

A third embodiment of the present invention will be described with reference to FIG. In the figure, the same members as those shown in FIGS. 1, 2 and 7 are designated by the same reference numerals.

In FIG. 8, the displacement sensor 4B according to the present embodiment is a combination of the sensor main body 30B and two parts of the plug-shaped member 31, the detection rod 21 and the spring 22, and the plug-shaped member 31 is the first. The sensor main body 30B is the same as that of the first embodiment.
The sensor main body 30 is the same as the sensor main body 30 of the first embodiment except that the first screw hole 41 is engaged with its own screw portion 38 and is fastened and fixed. That is, in this embodiment, the lock nut 32 is eliminated from the displacement sensor 4 according to the first embodiment shown in FIGS. 1 and 2, and the sensor body 30 can be directly fastened and fixed to the plug-shaped member 31. It is a thing. The method of fixing the sensor main body 30B to the plug-shaped member 31 is as follows.
Instead of the screw type using 8, the other method such as adhesion, welding, press fitting, screwing, etc. may be used. In that case, the gripping head 37
The screw portion 38 may be omitted.

Also in this embodiment, the displacement sensor 4B can be easily attached to and detached from the poppet valve 2, and the flow rate detector can be used as an ordinary check valve. Can be easily changed or vice versa. Further, as a result, it is possible to easily change the specifications of the hydraulic system and shorten the stop time of the hydraulic system when the displacement sensor fails. Furthermore, since the screw hole 13a of the back cover 13 of the poppet valve 2 can be closed by using a general-purpose plug 90 (see FIG. 3), the cost of parts can be reduced, which is extremely economical.

A fourth embodiment of the present invention will be described with reference to FIG. In the figure, the same members as those shown in FIGS. 1, 2 and 7 are designated by the same reference numerals.

In FIG. 9, the displacement sensor 4C according to the present embodiment is a combination of one part of the sensor body 30B, the detection rod 21 and the spring 22, and the sensor body 30C is the rear cover 13 of the poppet valve 2. Screw hole 1
3A is the same as the sensor main body 30 of the second embodiment, except that it is configured to be engaged and fixed with the threaded portion 38 of itself. That is, in this embodiment, the lock nut 32 is eliminated from the displacement sensor 4A according to the second embodiment shown in FIG. 7, and the sensor body 30C can be directly fastened and fixed to the back cover 13.

Also in the present embodiment, the displacement sensor 4B can be easily attached to and detached from the poppet valve 2, the flow rate detector can be used as an ordinary check valve, and it can be used as an ordinary check valve. Can be easily changed or vice versa. Further, as a result, it is possible to easily change the specifications of the hydraulic system and shorten the stop time of the hydraulic system when the displacement sensor fails.

Further, in this embodiment, the back cover 13
The screw hole 13a may have a shape that can accept a general-purpose plug as in the embodiment of FIG. 1, and the threaded portion 38 of the sensor body 30C may have the same size as the threaded portion of the general-purpose plug. In this case, As in the above-described embodiment, the screw hole 13a of the back cover 13 of the poppet valve 2 can be closed by using the general-purpose plug 90 (see FIG. 3), so that the cost of parts can be reduced.

[0077]

According to the present invention, the displacement sensor can be easily attached to and removed from the poppet valve, can be used as an ordinary check valve, and can be changed to an ordinary check valve or vice versa. Can be easily changed.

Further, according to the present invention, since the screw hole of the back cover of the poppet valve can be closed by using a general-purpose plug, the cost of parts can be reduced and it is extremely economical.

Further, according to the present invention, it is possible to accurately adjust the initial preset position of the detection rod of the displacement sensor.

Further, according to the present invention, it becomes easy to dispose the detection rod of the displacement sensor in contact with the poppet, and the displacement sensor can be attached to and removed from the poppet valve more easily.

Further, according to the present invention, when the output of the displacement sensor reaches the minimum or maximum output, it can be determined that the displacement sensor is out of order, and the failure of the displacement sensor can be easily determined.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a poppet valve type flow meter according to an embodiment of the present invention.

FIG. 2 is a diagram showing details of a displacement sensor section of the poppet valve type flow meter shown in FIG.

FIG. 3 is a diagram showing a configuration of a displacement detection unit of a displacement sensor.

FIG. 4 is a view showing a flow rate measuring device using the poppet valve type flow rate measuring device shown in FIG. 1.

FIG. 5 is a diagram showing an appearance of a general-purpose plug.

FIG. 6 is a diagram showing output characteristics of a displacement sensor.

FIG. 7 is a vertical sectional view similar to FIG. 1 of a poppet valve type flow rate measuring device according to a second embodiment of the present invention.

FIG. 8 is a vertical cross-sectional view similar to FIG. 1 of a poppet valve type flow meter according to a third embodiment of the present invention.

FIG. 9 is a vertical cross-sectional view similar to FIG. 1 of a poppet valve type flow meter according to a fourth embodiment of the present invention.

[Explanation of symbols]

1 body 2 cover 3 poppets 4 spacers 5 springs 6 Displacement sensor 7 poppet valve 11 entrance port 12 exit ports 13 Rear cover 13a screw hole 14 Spacer 15 spring 21 Detection rod 22 Rod support spring 30 sensor body 31 Plug-shaped member 31a screw part 32 lock nut 38 screw 39 O-ring 40 Axial hole 41 screw holes 42 screw 43 holes 60 harness 61 resistor 62 conductor 63 slider 64a, 64b power line 65 power supply 66 signal line 70 Arithmetic control device 71 Displacement calculator 72 Flow rate calculator 73 Display processing unit 80 display 90 Universal plug 4A, 4B, 4C displacement sensor

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideyo Kato             Hitachi Construction Machinery Co., Ltd.             Ceremony Company Tsuchiura Factory F-term (reference) 2F030 CF05 CF14

Claims (7)

[Claims] 1. A poppet valve type flow meter having a poppet valve and a displacement sensor for measuring the displacement of the poppet of the poppet valve, wherein the displacement sensor has a threaded portion on the outer periphery and a bolt-like grip at one end. A sensor main body provided with a head, a screw hole for engaging a screw portion of the sensor main body is formed in a back cover of the poppet valve, and the sensor main body is engaged with the rear cover of the poppet valve by the screw portion. A poppet valve type flow rate measuring device characterized by being joined together and fixed. 2. A poppet valve type flow meter having a poppet valve and a displacement sensor for measuring the displacement of the poppet of the poppet valve, wherein the displacement sensor has the same outer shape as a sensor body and a general-purpose plug. And a plug-shaped member incorporating the sensor body, wherein a screw hole for engaging the plug-shaped member is formed in the back cover of the poppet valve, and the plug-shaped member is screwed on the back cover of the poppet valve. A poppet valve type flow meter, characterized by being screwed into a hole and fastened and fixed. 3. A poppet valve type flow meter having a poppet valve and a displacement sensor for measuring the displacement of the poppet of the poppet valve, wherein the displacement sensor has a threaded portion on the outer periphery and a bolt-like grip at one end. A sensor body having a head portion; and a lock nut that engages with a threaded portion of the sensor body, and a screw hole with which the threaded portion of the sensor body engages is formed in the back cover of the poppet valve, A poppet valve type flow meter, wherein a main body is engaged with a back cover of the poppet valve by the screw portion, and a positional relationship between the sensor main body and the back cover is fixed by the lock nut. 4. A poppet valve type flow meter having a poppet valve and a displacement sensor for measuring the displacement of the poppet of the poppet valve, wherein the displacement sensor has a threaded portion on the outer periphery and a bolt-like grip at one end. A sensor body having a head portion, a plug-like member having the same outer shape as a general-purpose plug and having a screw hole with which the screw portion of the sensor body engages, and engaging with the screw portion of the sensor body And a lock nut that forms a screw hole with which the plug-shaped member engages on the back cover of the poppet valve, and the sensor body engages with the screw hole of the plug-shaped member at the screw portion, and A poppet valve characterized in that a plug-shaped member is screwed into a screw hole of a back cover of the poppet valve, and the positional relationship between the sensor body and the plug-shaped member is fixed by the lock nut. The flow rate measuring device. 5. The poppet valve type flow rate measuring device according to claim 1, further comprising a detection rod that moves together with the poppet of the poppet valve and transmits the displacement thereof to the sensor main body. A poppet valve type flow measuring device, wherein the rod is pressed against the poppet by a spring. 6. The poppet valve type flow rate measuring device according to claim 5, wherein the initial preset position of the detection rod corresponding to the minimum stroke of the poppet is a position slightly moved from the position where the output of the displacement sensor is minimum, The movement range of the detection rod, which corresponds to the maximum stroke position of the poppet, regulates the movement range of the poppet so that it does not reach the maximum movement position relative to the sensor body, and the displacement sensor output is the minimum and maximum output of the poppet at the minimum and maximum stroke positions. A poppet valve type flow rate measuring device characterized by being set so as not to be 7. A poppet valve type flow rate measuring device according to any one of claims 1 to 4, and display control means for converting a displacement measured by this measuring device into a flow rate and displaying the flow rate. Flow rate measuring device.