JP2010159783A - Drive detection circuit and drive detection method of fluid pressure apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely detect the movement state of a moving body irrespective of the installation environment of a fluid pressure apparatus. <P>SOLUTION: A drive detection circuit 10 of a fluid pressure apparatus includes a pressure fluid supply source 12 installed in a region A, an environment having general atmospheric air; a switching valve 18; a flow rate detection section 20; and a control section 22. A fluid pressure cylinder 14, which is connected to the pressure fluid supply source 12 and the switching valve 18 via a pipe 16, is installed, for example, in a region B under an explosion-proof atmospheric environment and a strong magnetic field environment. Then, first and second flow sensors 48, 50 constituting the flow rate detection section 20 detect the flow rates of pressure fluid supplied to the fluid pressure cylinder 14 and air discharged from the cylinder 14 and detect the movement direction and movement amount of a piston 26 based on the flow rates. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a drive detection circuit and a drive detection method for a fluid pressure device for detecting a drive state of a fluid pressure device driven under the action of supplying a pressure fluid.

  2. Description of the Related Art Conventionally, for example, a fluid pressure cylinder having a piston that moves under the action of supplying a pressure fluid has been used as a means for conveying a workpiece or the like. In such a fluid pressure cylinder, a piston is movably provided in a cylinder chamber defined inside a cylindrical cylinder body, and a head cover and a rod cover are respectively attached to both ends of the cylinder body. The chamber is closed.

  In addition, a magnet is provided on the outer peripheral surface of the piston via an annular groove, and the magnetism of the magnet is detected by a magnetic detection sensor mounted outside the cylinder body and output as an electric signal to the control unit. Thus, the stroke position of the piston is detected.

JP 2008-20032 A

  However, in the prior art according to Patent Document 1, when the fluid pressure cylinder is used in an explosion-proof atmosphere environment or in an environment where electrical wiring is difficult, for example, the movement of the piston cannot be detected by the magnetic detection sensor. There is a problem. Further, when the fluid pressure cylinder is largely moved, there is a concern that the electric wiring connected to the magnetic detection sensor is pulled and disconnected. Further, when used in a strong magnetic field environment, there is a concern that the magnetic detection sensor may malfunction, and it is difficult to accurately detect the position of the piston.

  The present invention has been made in consideration of the above-described problems, and is a fluid pressure device drive detection circuit and drive capable of reliably detecting the moving state of a moving object regardless of the installation environment of the fluid pressure device. An object is to provide a detection method.

In order to achieve the above object, the present invention provides a fluid pressure device drive detection circuit for detecting a drive state of a fluid pressure device having a moving body that is driven under a fluid supply action.
A fluid supply source for supplying fluid;
A set of pipes connecting the fluid supply source and a set of ports in the fluid pressure device, and through which the fluid flows;
A switching mechanism for switching a supply state of the fluid supplied from the fluid supply source to the fluid pressure device through the pipe;
A detection unit that is provided in the pipe and detects a flow rate of the fluid flowing through the pipe;
With
The fluid pressure device is provided in a second space different from the first space in which the detection unit is installed.

  According to the present invention, the port of the fluid pressure device having the moving body and the fluid supply source are connected by a set of pipes, and a detection unit capable of detecting the flow rate of the fluid is provided to the pipes. The fluid pressure device is provided in a second space different from the first space in which the detection unit is installed. The fluid is supplied from the fluid supply source to the fluid pressure device through one of the pipes, and when the moving body moves under the pressing action of the fluid, the port of the fluid pressure device is moved along with the movement of the moving body. When the fluid discharged from the fluid flows to the other pipe, the flow rate of the fluid is detected by the detection unit.

  Therefore, for example, even when the fluid pressure device is installed in the second space which is an explosion-proof atmosphere or a strong magnetic field, the detection unit is provided in the first space different from the fluid pressure device. It is possible to safely detect and output the flow rate of the fluid by the unit. That is, even when the fluid pressure device is installed in an explosion-proof atmosphere environment or the like, since the detection unit is provided in the first space different from the explosion-proof atmosphere environment, even when a detection unit that outputs an electrical signal is used. The flow rate of the fluid can be detected safely, and the moving state of the moving body in the fluid pressure device can be reliably confirmed based on the detection result.

  In addition, by providing the detection unit in at least one of the pair of pipes, the flow rate of the fluid supplied to the fluid pressure device through the pipe or the fluid discharged from the fluid pressure device is detected by the detection unit. Since it can detect, the movement state of a moving body can be confirmed reliably based on the said flow volume.

  Further, by providing each of the detection units in a set of pipes, the flow rate of the fluid supplied to the fluid pressure device through the pipes or the fluid discharged from the fluid pressure device is respectively determined by the set of detection units. Since it can detect, the movement state of a moving body can be confirmed more reliably based on the said flow volume.

  Furthermore, by outputting the fluid flow rate from the detection unit to the control unit as a detection signal, the control unit confirms whether the moving body of the fluid pressure device is in a moving state or a stopped state from the detection signal. can do.

  Furthermore, the fluid pressure device includes a cylinder body and a piston that is displaceably provided inside the cylinder body, and the fluid pressure cylinder is configured to freely displace the piston along the axial direction under the fluid supply action. It is good to do.

On the other hand, the present invention is a fluid pressure device drive detection method for detecting a drive state of a fluid pressure device having a moving body driven under a fluid supply action,
Detecting a flow rate of at least one of the fluid supplied to the fluid pressure device or the fluid discharged from the fluid pressure device with a detection unit;
Outputting the flow rate of the fluid detected by the detection unit to the control unit as a detection signal;
In the control unit, a step of determining based on the detection signal whether the moving body of the fluid pressure device has moved or stopped along the axial direction;
It is characterized by having.

  According to the present invention, when the fluid is supplied from the fluid supply source to the fluid pressure device through the pipe and the moving body moves under the pressing action of the fluid, the fluid pressure device is moved along with the movement of the moving body. When the fluid discharged from the other port flows to the other pipe, the flow rate of the fluid flowing through the pipe is detected by the detection unit, and the flow rate of the fluid detected by the detection unit is detected as a detection signal to the control unit. After the output, the control unit determines whether the moving body is in a moving state or in a stopped state based on the detection signal.

  Therefore, based on the fluid flow rate detected by the detection unit, the control unit can determine whether the moving body of the fluid pressure device is in a moving state or a stopped state, and confirm the driving state of the fluid pressure cylinder. It becomes possible.

  Further, after the detection signal is input to the control unit, an output signal may be output to the outside when the detection signal exceeds a preset set value. Thereby, an output signal can be output based on the movement state of the moving body in the fluid pressure device, and the external device can be controlled in conjunction with the output signal.

Furthermore, the step of calculating the integrated flow rate by integrating the flow rate of the fluid based on the detection signal input to the control unit,
When the integrated flow rate exceeds a preset setting value, an output signal may be output to the outside.

  According to the present invention, the following effects can be obtained.

  That is, the port of a fluid pressure device having a moving body and a fluid supply source are connected by a set of pipes, and a detection unit capable of detecting the flow rate of the fluid is provided to the pipes, and the fluid pressure device Is provided in a second space different from the first space in which the detection unit is installed, so that the fluid pressure device can be detected even in a second space that is an explosion-proof atmosphere or a strong magnetic field, for example. Since the unit is provided in a first space different from the fluid pressure device, the flow rate of the fluid can be detected safely even when a detection unit that outputs an electrical signal is used, and the fluid pressure is detected based on the detection result. It is possible to reliably check the moving state of the moving body in the device.

It is a schematic block diagram of the drive detection circuit of the fluid pressure apparatus which concerns on the 1st Embodiment of this invention. It is a time chart which shows the relationship between the flow volume of the pressure fluid detected with the 1st and 2nd flow sensor in the drive detection circuit of FIG. 1, and the operation state of piston in a fluid pressure cylinder, and time. FIG. 3 is a time chart showing a case where an output signal output corresponding to the operation state of the piston is added to FIG. 2. It is a time chart figure which added the relationship of the integrated flow which integrated the flow detected by the 1st and 2nd flow sensor with respect to FIG. It is a schematic block diagram of the drive detection circuit of the fluid pressure apparatus which concerns on the 2nd Embodiment of this invention. FIG. 6 is a time chart showing the relationship between the flow rate of the pressure fluid detected by the flow sensor in the drive detection circuit of FIG. 5, the operating state of the piston in the fluid pressure cylinder, and time. It is the time chart figure which added the relationship of the integrated flow which integrated the flow detected by the flow sensor with respect to FIG.

  A preferred embodiment of a drive detection circuit and a drive detection method for a fluid pressure device according to the present invention will be described in detail below with reference to the accompanying drawings.

  In FIG. 1, reference numeral 10 indicates a drive detection circuit for a fluid pressure apparatus according to the first embodiment of the present invention. Here, a case will be described in which a fluid pressure cylinder 14 having a piston (moving body) 26 that undergoes stroke displacement under a pressure fluid supply action is used as the fluid pressure device.

  The fluid pressure device drive detection circuit 10 includes a pressure fluid supply source (fluid supply source) 12, a fluid pressure cylinder 14 driven by the pressure fluid supplied from the pressure fluid supply source 12, and the pressure fluid supply source 12. And a switching valve (switching mechanism) that is provided between the pressure fluid supply source 12 and the fluid pressure cylinder 14 and switches the supply state of the pressure fluid to the fluid pressure cylinder 14. ) 18, a flow rate detection unit (detection unit) 20 that detects the flow rate of the pressure fluid flowing through the pipe 16, and a control unit 22 that receives the flow rate detected by the flow rate detection unit 20 as a detection signal; including.

  Then, the drive detection circuit 10 of the fluid pressure device has a pressure fluid supply source 12, a switching valve 18, a flow rate detection unit 20, and a control unit 22 in a region (first space) A that is an environment having a general atmosphere. On the other hand, the fluid pressure cylinder 14 is installed in a region (second space) B which is, for example, an explosion-proof atmosphere environment or a strong magnetic field environment. The piping 16 that connects the pressure fluid supply source 12 and the fluid pressure cylinder 14 is disposed so as to straddle the region A and the region B.

  The explosion-proof atmosphere environment mentioned above is, for example, a coating line of a product with a combustible gas drifting in which a part of the paint is vaporized, and a magnetic sensor that outputs an electric signal cannot be installed. For example, a welding line of an automotive panel or the like, and the generation of a strong magnetic field may reduce the accuracy of the detection result by the magnetic sensor. That is, the region B is an environment in which it is difficult to detect the driving of the fluid pressure device by a magnetic sensor or the like that performs electrical detection.

  The fluid pressure cylinder 14 includes a cylindrical cylinder body 24, a piston 26 movably provided inside the cylinder body 24, and a piston rod 28 connected to the piston 26. One ends of first and second pipes 34 and 36 (described later) are connected to first and second ports 30 and 32 provided on the side surfaces, respectively. Then, when the pressure fluid is supplied from the pressure fluid supply source 12 through the first or second port 30 or 32, the piston 26 is pressed by the pressure fluid introduced into the cylinder body 24 and the axial direction of the cylinder body 24 ( Move in the direction of arrows C and D).

  The piping 16 is switched between the first piping 34 connected to the first port 30 of the fluid pressure cylinder 14, the second piping 36 connected to the second port 32 of the fluid pressure cylinder 14, and the pressure fluid supply source 12. It consists of supply piping 38 connected between the valves 18. Specifically, the first pipe 34 has one end connected to the first port 30 and the other end connected to a first connection port 44 (described later) of the switching valve 18. The second pipe 36 has one end connected to the second port 32 and the other end connected to a second connection port 46 (described later) of the switching valve 18. Furthermore, the supply pipe 38 has one end connected to the pressure fluid supply source 12 and the other end connected to a supply port 42 (described later) of the switching valve 18. A regulator 39 capable of adjusting the pressure of the pressure fluid supplied from the pressure fluid supply source 12 and a pressure gauge 40 capable of confirming the pressure are connected in the middle of the supply pipe 38.

  The switching valve 18 is composed of, for example, an electromagnetic valve driven by a control signal (current) from a controller (not shown), and a supply port 42 connected to the pressure fluid supply source 12 via a supply pipe 38 and a first pipe 34 are provided. It has the 1st connection port 44 connected, and the 2nd connection port 46 to which the 2nd piping 36 is connected. When the control signal is not input to the switching valve 18, the supply port 42 and the first connection port 44 communicate with each other, and the pressure fluid from the pressure fluid supply source 12 passes through the first pipe 34 and the fluid pressure cylinder 14. On the other hand, when the control signal is input to the switching valve 18, the solenoid portion 18a is excited to switch the supply port 42 and the second connection port 46 to communicate with each other. The pressure fluid from the pressure fluid supply source 12 is supplied to the second port 32 of the fluid pressure cylinder 14 through the second pipe 36.

  That is, the switching valve 18 causes the first connection port 44 or the second connection port 46 and the supply port 42 to communicate with each other by the control signal, and the pressure fluid supplied from the pressure fluid supply source 12 is supplied to the first fluid pressure cylinder 14. It is distributed to either the port 30 or the second port 32.

  The flow rate detection unit 20 is provided in the middle of the first pipe 34, and is provided in the middle of the first flow sensor 48 capable of detecting the flow rate of the pressure fluid flowing through the first pipe 34 and the second pipe 36. The second flow sensor 50 can detect the flow rate of the pressure fluid flowing through the second pipe 36. The first and second flow sensors 48 and 50 are electrically connected to the control unit 22 via lead wires 52, respectively, and output the detected flow rate value of the pressure fluid to the control unit 22 as a detection signal. .

  Further, since the flow rate detection unit 20 is installed in the region A, it is possible to electrically output a detection signal to the control unit 22.

  The control unit 22 calculates the movement position and movement amount of the piston 26 in the fluid pressure cylinder 14 based on the flow rate value detected by the flow rate detection unit 20, and determines the movement position of the piston 26 with respect to an external device (not shown). Output.

  The fluid pressure device drive detection circuit 10 according to the first embodiment of the present invention is basically configured as described above. Next, the operation and effects of the drive detection circuit 10 will be described with reference to FIGS. The description will be given with reference. Here, as shown in FIG. 1, the state in which the piston 26 of the fluid pressure cylinder 14 has moved to the second port 32 side (in the direction of arrow D) will be described as an initial state, and the piston 26 may be The case of moving toward the port 30 side (arrow C direction) is called forward, and the case of moving toward the second port 32 side (arrow D direction) is called backward.

  In this initial state, the switching valve 18 is in a non-energized state (OFF), the pressure fluid supply source 12 and the first port 30 communicate with each other through the switching valve 18, and the pressure fluid passes through the first port 30 to the cylinder body 24. The piston 26 is introduced into the interior, and is moved by pressing the piston 26 toward the second port 32 (arrow D direction), and the piston 26 is stopped at the initial position (stopped state).

  First, when a control signal is input to the solenoid portion 18a of the switching valve 18 and energized (ON), the supply port 42 and the second connection port 46 communicate with each other under the excitation action, and the pressure fluid passes through the switching valve 18. The fluid flows from the pressure fluid supply source 12 to the second port 32 of the fluid pressure cylinder 14. The first port 30 is opened to the atmosphere via the switching valve 18. The piston 26 is pushed forward by the pressure fluid introduced from the second port 32 into the cylinder body 24 toward the first port 30 (in the direction of arrow C), and the cylinder body pressed by the piston 26. The air in 24 is discharged from the first port 30 to the switching valve 18 side through the first pipe 34.

  At this time, the flow rate of the pressure fluid flowing through the second pipe 36 is detected by the second flow sensor 50 and output to the control unit 22 as a detection signal, and also flows through the first pipe 34 to the outside from the switching valve 18. The flow rate of the discharged air is detected by the first flow sensor 48 and output to the control unit 22 as a detection signal. Specifically, the flow rates detected by the first and second flow sensors 48 and 50 are increased as compared with the initial state in which the movement of the piston 26 is stopped.

  As shown in FIG. 2, the detection signal of the second flow sensor 50 in the control unit 22 detects the flow rate when the pressure fluid flows toward the fluid pressure cylinder 14 (arrow C direction). Therefore, the detection signal is represented by plus (+), and conversely, the detection signal of the first flow sensor 48 detects the flow rate when the exhaust air flows from the fluid pressure cylinder 14 toward the switching valve 18 side. Therefore, the detection signal is represented by minus (−). In other words, the detection signals (flow rate values) detected by the first and second flow sensors 48 and 50 are positive (+) on the intake side (positive flow side) where the pressure fluid is supplied to the fluid pressure cylinder 14. The side discharged from the fluid cylinder (back flow side) is expressed as minus (−), and it is confirmed which of the first and second ports 30 and 32 is the pressure fluid supply side and the discharge side. By doing so, the moving direction of the piston 26 is detected.

  As a result, pressure fluid is supplied to the second port 32 of the fluid pressure cylinder 14 and air is discharged from the first port 30 of the fluid pressure cylinder 14 based on the detection results of the first and second flow sensors 48 and 50. It is confirmed that the piston 26 is moving forward toward the first port 30 (in the direction of arrow C).

  Next, after the piston 26 moves forward by a predetermined distance, it reaches the movement end position where the movement has stopped. In this case, as shown in FIG. 2, when the piston 26 stops, the flow rate of the pressure fluid supplied to the second port 32 of the fluid pressure cylinder 14 decreases and becomes constant. The flow rate of the discharged air that is discharged also decreases and becomes constant. That is, it is confirmed by the control unit 22 that the flow rates of the pressure fluid and the exhaust air detected by the first and second flow sensors 48 and 50 decrease and keep constant with respect to the forward movement of the piston 26, respectively. It is confirmed that the movement of the piston 26 is stopped.

  On the other hand, by stopping the input of the control signal to the switching valve 18 and turning it off (OFF), the solenoid part 18a is turned off, and accordingly, the spring 18b (see FIG. 1) is subjected to the elastic action. The supply port 42 and the first connection port 44 are switched so as to communicate with each other. Then, the pressure fluid flows from the pressure fluid supply source 12 through the switching valve 18 to the first port 30 of the fluid pressure cylinder 14, and the second port 32 is opened to the atmosphere through the switching valve 18.

  As a result, the piston 26 is pushed back toward the second port 32 (in the direction of arrow D) by the pressure fluid introduced from the first port 30 into the cylinder body 24, and the cylinder pushed by the piston 26 is retracted. Air in the main body 24 is discharged from the second port 32 to the switching valve 18 through the second pipe 36.

  At this time, the flow rate of the pressure fluid flowing through the first pipe 34 is detected by the first flow sensor 48 and output to the control unit 22 as a detection signal. The pressure fluid is supplied to the intake side to which the fluid pressure cylinder 14 is supplied. Therefore, the detection signal is represented by plus (+). On the other hand, the flow rate of the discharged air that flows through the second pipe 36 and is discharged to the outside from the switching valve 18 is detected by the second flow sensor 50 and is output to the control unit 22 as a detection signal. Since it is the side discharged from the fluid pressure cylinder 14, the detection signal is represented by minus (−) in the control unit 22.

  As a result, pressure fluid is supplied to the first port 30 of the fluid pressure cylinder 14 and air is discharged from the second port 32 of the fluid pressure cylinder 14 based on the detection results of the first and second flow sensors 48 and 50. It is confirmed that the piston 26 is in a retracted state in which the piston 26 is moving toward the second port 32 (in the direction of arrow C).

  Then, after the piston 26 moves backward by a predetermined distance, it reaches the movement end position where the movement is stopped. In this case, as shown in FIG. 2, the flow rate of the pressure fluid supplied to the first port 30 of the fluid pressure cylinder 14 decreases and becomes constant, while the flow rate of the exhaust air discharged from the second port 32 Also decreases and becomes constant. That is, it is confirmed by the control unit 22 that the flow rates of the pressure fluid and the exhaust air detected by the first and second flow sensors 48 and 50 decrease and change constantly with respect to the forward and backward movements of the piston 26. It is confirmed that the movement of the piston 26 is stopped.

  As described above, in the first embodiment, even when the fluid pressure cylinder 14 is installed in, for example, the region B that is in an explosion-proof atmosphere environment or a strong magnetic field environment, the region is in a general atmospheric environment. The movement state of the piston 26 in the fluid pressure cylinder 14 is detected by detecting the flow rate of the pressure fluid and air supplied to and exhausted from the fluid pressure cylinder 14 by the first and second flow sensors 48 and 50 provided in A. Can be confirmed reliably and with high accuracy. As a result, there is no need to install a detection means for detecting the movement state of the piston 26 in the region B. Therefore, the installation environment (region B) of the fluid pressure cylinder 14 is not limited by the detection means. The moving position can be detected reliably and with high accuracy.

  That is, in the drive detection circuit 10 of the fluid pressure device, it is possible to avoid a safety problem that is a concern when the movement detection means (for example, a magnetic detection sensor) of the piston 26 using electricity is provided in the region B. The moving position of the piston 26 can be detected safely.

  Further, for example, the electric wiring required when the magnetic detection sensor is provided in the region B becomes unnecessary, and only the first and second pipes 34 and 36 for supplying the pressure fluid are provided in the fluid pressure cylinder 14. Since it is only necessary to connect, it is possible to detect the movement position and movement amount of the piston 26 with a simple configuration, and it is possible to reduce the work time required for connecting the electric wiring. Is preferred.

  Furthermore, the space for the electrical wiring conventionally connected to the magnetic sensor is not required, and the drive detection circuit 10 can be reduced in size and space.

  Furthermore, in the fluid pressure cylinder using the conventional magnetic sensor, it is possible to prevent the disconnection of the electric wiring, which is a concern when the fluid pressure cylinder is largely moved, and the detection failure caused by the disconnection is avoided. It is preferable.

  On the other hand, as shown in FIG. 3, in the control unit 22, a set value E for outputting an output signal when the flow rate of the pressure fluid supplied to the fluid pressure cylinder 14 is detected by the first flow sensor 48. And a set value F for outputting an output signal when the flow rate of the pressure fluid supplied to the fluid pressure cylinder 14 is detected by the second flow sensor 50 may be set. This set value E is on the plus (+) side with respect to the flow rate (= 0) detected by the first flow sensor 48 when the fluid pressure cylinder 14 is stopped, and is substantially constant without changing over time. Is set. On the other hand, the set value F is also on the plus (+) side with respect to the flow rate (= 0) detected by the second flow sensor 50 when the fluid pressure cylinder 14 is stopped, and does not change over time. It is set almost constant.

  That is, when the piston 26 is in the forward movement state, the detection signal of the second flow sensor 50 exceeds the set value F, and an output signal is output from the control unit 22. The output signal is output from the control unit 22 to an external device (not shown), and the movement position (advance) of the piston 26 obtained on the basis of the detection result of the flow rate detection unit 20 is set to the external device. It is also possible to control the output in conjunction with the control. On the other hand, when the piston 26 is in the reverse drive state, the detection signal of the first flow sensor 48 exceeds the set value E, and an output signal is output from the control unit 22. The output signal is output from the control unit 22 to an external device (not shown), so that the movement position (reverse) of the piston 26 obtained based on the detection result of the flow rate detection unit 20 can be obtained from the external device. It is also possible to control the output in conjunction with the control.

  Note that, as described above, the set values E and F are not limited to the case where the output signal is output when the piston 26 is in the forward or reverse state. For example, the set values E and F are set to the fluid pressure cylinder. 14 is set to the minus (−) side with respect to the flow rate in the stopped state, the forward movement state of the piston 26 is detected based on the detection signal of the first flow sensor 48, and based on the detection signal of the second flow sensor 50. The reverse state of the piston 26 may be detectable.

  Further, as shown in FIG. 4, the flow rates of the pressure fluid and the exhaust air detected by the first and second flow sensors 48 and 50 are respectively integrated in the control unit 22 to calculate the integrated flow rates Q1 and Q2, In the stop state in which the movement of the piston 26 is stopped, the integrated flow rates Q1 and Q2 are once reset to zero, and after the piston 26 starts moving again, the integration of the flow rate is started to newly set the integrated flow rates Q1 and Q2. You may make it calculate. In addition, by setting the set values G and H on the plus (+) side where the integrated flow rates Q1 and Q2 are calculated when the pressure fluid is supplied, the integrated flow rates Q1 and Q2 are constant. 26, the integrated flow rates Q1 and Q2 exceed the set values G and H, and an output signal is output from the control unit 22 to an external device (not shown).

  That is, the integrated flow rates Q1 and Q2 are calculated from the flow rates of the pressurized fluid and exhaust air detected by the first and second flow sensors 48 and 50, and an output signal is output when the preset values G and H are exceeded. By outputting, it can be confirmed that the piston 26 of the fluid pressure cylinder 14 is in a stopped state, and the external device can be controlled to be interlocked with the stop of the piston 26.

  Further, for example, even when the piston 26 stops at an intermediate position between the initial position and the displacement end position for some reason by monitoring the integrated flow rates Q1 and Q2 in the control unit 22, the movement position Can be easily and reliably confirmed.

  Note that the first and second flow sensors 48 and 50 described above may be provided integrally with the inside of the switching valve 18.

  Further, the first and second flow sensors 48 and 50 having a timer function may be adopted, a flow rate integrating function capable of integrating the flow rate may be provided, or an output signal may be output according to the instantaneous flow rate. May be provided, or an output signal based on the integrated flow rate integrated by the flow rate integration function may be output. By providing these in the first and second flow sensors 48 and 50, the configuration of the control unit 22 can be simplified, and the cost required for the control unit 22 can be reduced.

  It is also possible to detect the moving speed of the piston 26 in the fluid pressure cylinder 14 by constantly monitoring the flow rate of the pressure fluid and exhaust air detected by the first and second flow sensors 48 and 50.

  Further, similarly, by constantly monitoring the flow rate of the pressure fluid and the exhaust air detected by the first and second flow sensors 48 and 50, it is possible to confirm fluid leakage in the fluid pressure cylinder 14 and the pipe 16. Therefore, it is possible to promote energy saving by promptly preventing this leakage, and to provide a function of failure diagnosis and failure prevention diagnosis of the drive detection circuit 10 of the fluid pressure device. Thereby, for example, it is possible to easily determine the replacement time and maintenance time of the fluid pressure cylinder 14 and the pipe 16 by detecting fluid leakage.

  Next, a drive detection circuit 100 for a fluid pressure device according to a second embodiment is shown in FIG. The same components as those in the drive detection circuit 10 of the fluid pressure device according to the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the drive detection circuit 100 of the fluid pressure device according to the second embodiment, the flow rate detection unit 102 is provided from a single flow sensor 104, and the second piping in which the flow sensor 104 is connected to the second port 32. It is different from the drive detection circuit 10 of the fluid pressure device according to the first embodiment in that it is provided only at 36.

  The fluid pressure device drive detection circuit 100 supplies the pressure fluid to the second port 32 of the fluid cylinder through the second pipe 36 and discharges the exhaust air from the second port 32. It is set as the structure which can be confirmed by detecting.

  By adopting such a configuration, the flow rate detection unit 20 is composed of two first and second flow sensors 48 and 50, and the flow rate of the pressure fluid supplied to and discharged from the first and second ports 30 and 32 Compared with the drive detection circuit 10 of the fluid pressure device according to the first embodiment that has respectively detected the above, the circuit configuration can be simplified, and thus the cost can be reduced. Moreover, since it is the single flow sensor 104, the maintenance becomes easy. The flow sensor 104 is not limited to the case where the flow sensor 104 is provided for the second pipe 36 as described above. The flow sensor 104 is provided for the first pipe 34 and is supplied to and discharged from the first port 30. You may make it detect the flow volume of exhaust air.

  Further, similarly to the drive detection circuit 10 of the fluid pressure device according to the first embodiment, as shown in FIG. 6, the flow rate of the exhaust air from the fluid pressure cylinder 14 is controlled by the flow sensor 104 in the control unit 22. A set value E for outputting an output signal when detected, and a set value F for outputting an output signal when the flow rate of the pressure fluid supplied to the fluid pressure cylinder 14 is detected; May be set. This set value E is on the plus (+) side with respect to the flow rate (= 0) detected by the flow sensor 104 when the fluid pressure cylinder 14 is stopped, and is set to be substantially constant without changing over time. The On the other hand, the set value F is on the minus (−) side with respect to the flow rate (= 0) detected by the flow sensor 104 when the fluid pressure cylinder 14 is stopped, and is set to be substantially constant without changing over time. Is done.

  Then, when the detection signal from the flow sensor 104 exceeds the set values E and F, the control unit 22 may output an output signal to an external device (not shown) that the piston 26 is moving forward or backward.

  Further, as shown in FIG. 7, the flow rate of the pressure fluid and the discharge air detected by the single flow sensor 104 is integrated in the control unit 22 to calculate the integrated flow rate Q, and the movement of the piston 26 is stopped. In the stopped state, the integrated flow rate Q may be reset once to zero, and the integrated flow rate Q may be newly calculated by starting to integrate after the piston 26 starts moving again. Also, the set value J1 is set on the plus (+) side where the integrated flow rate Q is calculated when the pressure fluid is supplied, and the minus (−) side where the integrated flow rate Q is calculated when the exhaust air is discharged. By setting the set value J2 respectively, the integrated flow rate Q exceeds the set values J1 and J2 in a stopped state of the piston 26 where the integrated flow rate Q becomes constant, and the control unit 22 moves to an external device (not shown). An output signal is output. Specifically, as can be understood from FIG. 7, the integrated flow rate Q exceeds the set value J1 when the piston 26 stops from the forward movement state, and conversely, the set value when the piston 26 stops from the reverse movement state. It will be less than J2 and output as an output signal.

  That is, the integrated flow rate Q is calculated from the flow rate of the pressurized fluid and exhaust air detected by the flow sensor 104, and an output signal is output when the preset set values J1 and J2 are exceeded. It is possible to confirm that the piston 26 is in a stopped state, and to control an external device to be interlocked with the stopping of the piston 26.

  Further, for example, by monitoring the integrated flow rate Q in the control unit 22, even if the piston 26 stops at an intermediate position between the initial position and the displacement end position for some reason, the movement position can be easily set. And it becomes possible to confirm reliably.

  The drive detection circuit and the drive detection method for a fluid pressure device according to the present invention are not limited to the above-described embodiments, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10,100 ... Drive detection circuit of fluid pressure equipment 12 ... Pressure fluid supply source 14 ... Fluid pressure cylinder 16 ... Pipe 18 ... Switching valve 20, 102 ... Flow rate detection part 22 ... Control part 24 ... Cylinder body 26 ... Piston 30 ... No. 1 port 32 ... 2nd port 34 ... 1st piping 36 ... 2nd piping 38 ... supply piping 48 ... 1st flow sensor 50 ... 2nd flow sensor 104 ... flow sensor

Claims (8)

A fluid pressure device drive detection circuit for detecting a drive state of a fluid pressure device having a moving body driven under a fluid supply action,
A fluid supply source for supplying fluid;
A set of pipes connecting the fluid supply source and a set of ports in the fluid pressure device, and through which the fluid flows;
A switching mechanism for switching a supply state of the fluid supplied from the fluid supply source to the fluid pressure device through the pipe;
A detection unit that is provided in the pipe and detects a flow rate of the fluid flowing through the pipe;
With
The fluid pressure device drive detection circuit, wherein the fluid pressure device is provided in a second space different from the first space in which the detection unit is installed. The drive detection circuit according to claim 1,
The drive detection circuit for a fluid pressure device, wherein the detection unit is provided in at least one of the pair of pipes. The drive detection circuit according to claim 1,
The detection unit is provided in each of the set of pipes, and is a drive detection circuit for a fluid pressure device. The drive detection circuit according to claim 1,
The fluid pressure device drive detection circuit, wherein the fluid flow rate is output from the detection unit to the control unit as a detection signal. The drive detection circuit according to any one of claims 1 to 4,
The fluid pressure device is a fluid pressure cylinder that includes a cylinder body and a piston that is displaceably provided in the cylinder body, and that displaces the piston freely along an axial direction under the fluid supply action. A drive detection circuit for a fluid pressure device. A fluid pressure device drive detection method for detecting a drive state of a fluid pressure device having a moving body driven under a fluid supply action,
Detecting a flow rate of at least one of the fluid supplied to the fluid pressure device or the fluid discharged from the fluid pressure device with a detection unit;
Outputting the flow rate of the fluid detected by the detection unit to the control unit as a detection signal;
In the control unit, a step of determining based on the detection signal whether the moving body of the fluid pressure device has moved or stopped along the axial direction;
A drive detection method for a fluid pressure device. The drive detection method according to claim 6,
After the detection signal is input to the control unit, when the detection signal exceeds a preset set value, an output signal is output to the outside. . The drive detection method according to claim 6,
A step of calculating an integrated flow rate by integrating the flow rate of the fluid based on the detection signal input to the control unit;
A drive detection method for a fluid pressure device, wherein an output signal is output to the outside when the integrated flow rate exceeds a preset set value.

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