RU2777867C2 - System for selecting a fluid circuit and method for selecting a fluid circuit - Google Patents

Abstract

FIELD: hydraulics.

SUBSTANCE: selection system (100) for hydraulic circuits comprises: a cylinder selection unit (120); a database (DB8) where information related to a combination of multiple apparatus is pre-recorded; combination selection units (124A, 124B) for reading information related to a combination of multiple apparatus by size from the database and selecting an apparatus; and reselection units (128A, 128B) for reselecting an apparatus larger by one size when the stroke time resulting from modelling made using part of the apparatus selected by the combination selection unit exceeds the upper limit of stroke time, or when the pressure after the return process is less than or equal to the minimum working pressure.

EFFECT: reduction in the time for return of the hydraulic (pneumatic) cylinder to the maximum possible degree and consumption of energy by reusing the discharge pressure to return the hydraulic (pneumatic) cylinder, as well as simplification of the circuit for return of the hydraulic (pneumatic) cylinder due to the reuse of discharge pressure.

9 cl, 33 dwg

Description

FIELD OF TECHNOLOGY TO WHICH THE INVENTION RELATES

The present invention relates to a fluid circuit selection system (selection system for hydraulic circuits) and a fluid circuit selection method (selection method for hydraulic circuits), for example, for fluid circuits of air cylinders.

BACKGROUND OF THE INVENTION

The object of the hydraulic (pneumatic) cylinder driving device described in Japanese Patent Laid-Open Publication No. 2018-054117 is to reduce the time required for the return of the hydraulic (pneumatic) cylinder as much as possible and save energy by reusing exhaust pressure. for the return of the hydraulic (pneumatic) cylinder, as well as simplification of the circuit for the return of the hydro (pneumatic) cylinder by reusing the exhaust pressure.

In order to solve the above problems, the hydraulic (pneumatic) cylinder driving device described in Japanese Patent Laid-Open Publication No. 2018-054117 includes a switching valve, a high pressure air source, an exhaust port, and a check valve. When the switch valve is in the first position, the cylinder chamber on the head side communicates with the high pressure air supply, and the cylinder chamber on the stem sides communicates with the exhaust port. When the changeover valve is in the second position, the cylinder chamber on the head side communicates with the cylinder chamber on the rod sides through the check valve and simultaneously with the exhaust port.

BRIEF DESCRIPTION OF THE INVENTION

In order to implement an energy-saving fluid circuit that reuses exhaust air, such as the hydraulic (pneumatic) cylinder driving device described in Japanese Patent Laid-Open Publication No. 2018-054117, the dimensions of the devices must be appropriately selected; otherwise, it is difficult to meet the required conditions and specifications.

That is, the performance of such an energy-saving fluid circuit that reuses exhaust air may be degraded depending on the size of various devices (fluid control valves, pipelines, check valves, pilot check valves, valves, silencers, tanks, etc.) .

The present invention has been developed in view of the above circumstances, and its object is to provide a fluid circuit selection system and a fluid circuit selection method for selecting suitable sizes of drive units used in an energy-saving fluid circuit that reuses exhaust air.

[1] According to a first aspect of the present invention, a fluid circuit selection system for a fluid circuit including at least a cylinder and a plurality of devices coupled to the cylinder comprises:

a cylinder selection unit for selecting a cylinder;

a database including combination information of a plurality of devices previously registered in at least order of size;

a combination selection unit for reading combination information of a plurality of devices from a database in size order to select devices; and

a reselection unit for reselecting larger devices when the stroke time obtained from a simulation performed using a portion of the devices selected by the combination selector exceeds a pre-set maximum stroke time, or when the post-process pressure return resulting from the simulation is less than or equal to the minimum operating pressure.

[2] According to a second aspect of the present invention, a fluid circuit selection system for a fluid circuit including at least a cylinder and a plurality of devices coupled to the cylinder comprises:

a cylinder selection unit for selecting a cylinder;

a database including combination information of a plurality of devices previously registered in at least order of size;

a combination selection unit for reading combination information of a plurality of devices from a database in size order to select devices;

a first reselection unit for reselecting larger devices in the case where the stroke time obtained from the simulation performed using a portion of the devices selected by the combination selector exceeds a predetermined maximum stroke time, or in the case where the pressure after the return process, the result of the simulation is less than or equal to the minimum working pressure; and

a second reselection unit for reselecting larger devices in the event that the stroke time obtained from a simulation performed using all selected devices exceeds a pre-set maximum stroke time, or in the case that the pressure after the return process obtained using the devices currently selected is greater than or equal to the pressure after the return process obtained using the previously selected devices.

[3] According to a third aspect of the present invention, a method for selecting a fluid circuit for a fluid circuit including at least a cylinder and a plurality of devices connected to the cylinder comprises:

a cylinder selection step of selecting a cylinder;

a combination selection step of reading combination information of a plurality of devices in order of size from a database including information of combinations of a plurality of devices registered in advance in at least order of size to select devices; and

a reselection step of reselecting larger devices in the event that the stroke time obtained from the simulation performed using a portion of the devices selected in the combination selection step exceeds a predetermined maximum stroke time, or in the case that the pressure after return process obtained from the simulation is less than or equal to the minimum operating pressure.

[4] According to a fourth aspect of the present invention, a method for selecting a fluid circuit for a fluid circuit including at least a cylinder and a plurality of devices connected to the cylinder comprises:

a cylinder selection step of selecting a cylinder;

a combination selection step of reading combination information of a plurality of devices in order of size from a database including information of combinations of a plurality of devices registered in advance in at least order of size to select devices;

a first reselection step consisting in reselecting larger devices in the event that the stroke time obtained from a simulation performed using a portion of the devices selected in the combination selection step exceeds a predetermined maximum stroke time, or in the case where the pressure after the return process, the result of the simulation is less than or equal to the minimum working pressure; and

a second reselection step consisting in reselecting larger devices in the event that the stroke time obtained from the simulation performed using all the selected devices exceeds the pre-set maximum stroke time, or in the case that the pressure after the return process obtained using the devices currently selected is greater than or equal to the pressure after the return process obtained using the previously selected devices.

In accordance with the present invention, the dimensions of the drive units used in an energy-saving fluid circuit that reuses exhaust air can be appropriately selected.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1A is a schematic diagram of the circuit when the primary fluid circuit valve is in the first state, and

Fig. 1B illustrates the state of the primary fluid circuit during the drive process;

Fig. 2A is a schematic diagram of the circuit when the valve of the first fluid circuit is in the second state, and

Fig. 2B illustrates the state of the primary fluid circuit during the recovery process;

Fig. 3 is a perspective view of an example of a cylinder;

Fig. 4A is a schematic diagram of the circuit when the second fluid circuit valve is in the first state, and

Fig. 4B illustrates the state of the second fluid circuit during the drive process;

Fig. 5A is a schematic diagram of the circuit when the valve of the second fluid circuit is in the second state, and

Fig. 5B illustrates the state of the second fluid circuit during the recovery process;

Fig. 6 is a block diagram illustrating the structure of a fluid circuit selection system according to an embodiment;

Fig. 7A is an exemplary diagram of the structure of the cylinder database,

Fig. 7B is an exemplary diagram of the structure of the database on pipelines, and

Fig. 7C is an exemplary diagram of the structure of a reservoir database;

Fig. 8A is an exemplary structure diagram of a speed control valve database,

fig. 8 B - an exemplary diagram of the structure of the check valve database,

Fig.8C - an exemplary diagram of the structure of the valve database, and

Fig. 8D is an exemplary structure diagram of a silencer database;

Fig. 9 is an exemplary diagram of the structure of a database for combinations of devices;

Fig. 10 is an exemplary diagram of the structure of the second device combination database;

Fig. 11A is a physical model of the cylinder drive system,

Fig. 11 V are the basic equations for the choke, and

Fig. 11C - basic equations for the cylinder;

Fig. 12A is a pipeline model used for characterization,

Fig. 12 V - basic equations for the pipeline,

Fig. 12C is a discrete pipeline model for the i-th element, which is one of the n elements obtained by dividing the pipeline into n elements, and

Fig. 12D - basic equations for the i-th element of the discrete pipeline model;

Fig. 13 are symbols and subscripts of the basic equations shown in FIG. 11A-11C and 12A-12D;

Fig. 14 is a graph illustrating the result of an exemplary calculation based on simulation in a characteristic calculation section;

Fig. 15 is a flowchart (1) illustrating processing operations in the selection system;

Fig. 16 is a graph illustrating travel time during actuation and pressure after return obtained using devices with combination numbers 1 to 18;

Fig. 17 is a flowchart (2) illustrating processing operations in the selection system;

Fig. 18 is a graph illustrating travel time during actuation and pressure after return, obtained using devices with combination numbers 18 to 21; and

Fig. 19 is a flowchart (3) illustrating processing operations in the selection system.

DESCRIPTION OF THE EMBODIMENT

Below, with reference to the accompanying drawings, a detailed description is given of a preferred embodiment of a fluid circuit selection system and a fluid circuit selection method in accordance with the present invention.

With reference to FIG. 1A-19 are descriptions of a fluid circuit selection system (hereinafter referred to as "selection system 100") according to the present embodiment.

The selection system 100 selects sizes of drive units that are used in an energy saving fluid circuit that recycles exhaust air based on size data of cylinders, pipelines, devices, and the like stored in various databases.

Below, with reference to 1A-5B, a description is given of examples of an energy-saving fluid circuit that reuses exhaust air and serves as an object of choice.

As shown in FIG. 1A, first fluid circuit 10A includes first conduit 12a (B), second conduit 12b (A), and valve 16 (H).

Cylinder 30 includes a cylinder liner 32, a head cover 34, and a stem cover 36 as shown in FIG. 3 and piston 38, piston rod 40 and other structural elements as shown in FIG. 1A. The first end of the cylinder liner 32 is closed by the rod cover 36, and the second end of the cylinder liner 32 is closed by the head cover 34. The piston 38 (see Fig. 1A) is reciprocally mounted inside the cylinder liner 32. As shown in FIG. 1A, the interior of the cylinder liner 32 is divided into, for example, a first air chamber 42a formed between the piston 38 and the stem cover 36 and a second air chamber 42b formed between the piston 38 and the head cover 34.

The piston rod 40 connected to the piston 38 passes through the first air chamber 42a, and the end of the piston rod 40 exits through the rod cover 36. Cylinder 30 does work such as positioning workpieces (not shown) when piston rod 40 is pushed out (when piston rod 40 is extended), and does no work when piston rod 40 is retracted.

The first pipeline 12a (B) is located between the first air chamber 42a of the cylinder 30 and the valve 16 (H). The second pipeline 12b (A) is located between the second air chamber 42b of the cylinder 30 and the valve 16 (H).

Two speed control valves (a first speed control valve 50a (F) and a second speed control valve 50b (G) are installed at certain points on the second conduit 12b(A). The first speed control valve 50a (F) is a variable throttle valve of the so-called metering type and allows manual adjustment of the air flow rate discharged from the second air chamber 42b. At the same time, the second speed control valve 50b (G) is a variable throttle valve of the so-called metering type, and allows manual adjustment of the air flow rate supplied to the second air chamber 42b. For the air stored in the second air chamber 42b, the ratio of the amount of air supplied to the first air chamber 42a to the amount of air discharged to the outside can be controlled by actuating the first speed control valve 50a(F).

The first speed control valve 50a (F) includes a first check valve 52a and a first throttle valve 54a connected in parallel. First check valve 52a allows air to flow towards second air chamber 42b of cylinder 30 through valve 16 (H), but blocks air exiting second air chamber 42b of cylinder 30 towards valve 16 (H). The first throttle valve 54a controls the flow of air flowing out of the second air chamber 42b of the cylinder 30 towards the valve 16 (H).

The second speed control valve 50b includes a second check valve 52b and a second throttle valve 54b connected in parallel. Second check valve 52b allows air to escape from second air chamber 42b of cylinder 30 towards valve 16 (H), but blocks air from flowing towards second air chamber 42b of cylinder 30 through valve 16 (H). The second throttle valve 54b controls the flow of air flowing towards the second air chamber 42b of the cylinder 30 through the valve 16 (H).

In the first fluid circuit 10A, a third check valve 52c(E) is connected to a point on the second conduit 12b(A) between the cylinder 30 and the first speed control valve 50a(F). The third check valve 52 c (E) allows air to escape from the second conduit 12b (A) towards the valve 16 (H), but blocks the air exiting the valve 16 (H) towards the second conduit 12b (A).

At the same time, the valve 16 (H) is configured as a five-port on-off solenoid valve having ports from the first port 60a to the fifth port 60e and is switchable between the first position and the second position. The first port 60a is connected to the first conduit 12a (B). The second port 60b is connected to the second conduit 12b (A). The third port 60 is connected to the source 62 of the air supply. The fourth port 60d is connected to the exhaust port 64 with a muffler 63 (I) attached thereto. The fifth port 60e is connected to the third check valve 52c (E) described above. In addition, the first port 60a is connected to the fourth port 60d and the second port 60b is connected to the third port 60c. The third conduit 12c(C) extending from the third check valve 52c(E) to the fifth port 60e of valve 16(H) operates as one air accumulator.

As shown in FIG. 1A, when the valve 16 (H) is in the first position, the first port 60a is connected to the fourth port 60d and the second port 60b is connected to the third port 60c. At the same time, as shown in FIG. 2A, when the valve 16 (H) is in the second position, the first port 60a is connected to the fifth port 60e and the second port 60b is connected to the fourth port 60d.

The valve 16 (H) is held in the second position by the biasing force of the spring when not energized, and switches from the second position to the first position when it is energized. The valve 16 (H) is energized in response to a power-on (power-on) command supplied to the valve 16 (H) from a PLC (programmable logic controller; not shown), which is a higher level device, and in response to a stop command Power Supply (Power Off) The power supply stops.

The valve 16 (H) is in the first position during the actuation of the cylinder 30, in which the piston rod 40 extends, and is in the second position during the return of the cylinder 30, in which the piston rod 40 is retracted.

A tank 68 (D) is installed at a point on the first conduit 12a (B). Reservoir 68 (D) has a large volume to act as an air reservoir that stores air.

In FIG. 1A-2B are schematic diagrams of the first hydraulic circuit 10A. Certain flow channels within cylinder 30 are shown for convenience as extending outside of cylinder 30.

In practice, the area outlined by the dashed line in FIG. 1A, that is, a portion of the second conduit 12b(A) including a third check valve 52c(E) and a portion of the first conduit 12a(B) including a reservoir 68(D) are built into the cylinder 30.

In addition, for example, the first conduit 12a(B) in the area outlined by the dotted line in FIG. 1A runs as shown in FIG. 3 through the stem cover 36, the cylinder liner 32 and the head cover 34. The part of the section located inside the cylinder liner 32 corresponds to the tank 68 (D). For example, the cylinder liner 32 may have a two-layer structure including an inner liner and an outer liner so that the space between the inner and outer liner serves as reservoir 68 (D).

The first hydraulic circuit 10A has basically the structure described above. Below with reference to Fig. 1A-2B describe the operation of this circuit. The state in which, as shown in FIG. 1A, the valve 16 (H) is in the first position and the piston rod 40 is in the most retracted position, considered the initial state.

First, as shown in FIG. 1A and 1B, during the initial drive process, air from the air supply 62 is supplied to the second air chamber 42b through the second conduit 12b (A). This causes the air inside the first air chamber 42a to be discharged from the exhaust port 64 to the outside through the first conduit 12a (B). In this case, the air passes through the second speed control valve 50b (G), in which the flow is controlled by the second throttle valve 54b, and then is supplied to the second air chamber 42b through the first check valve 52a of the first speed control valve 50a (F). The air from the air supply source 62 is also supplied from the second conduit 12b (A) to the third conduit 12c (C) through the third check valve 52c (E).

This causes the pressure in the second air chamber 42b to begin to increase and the pressure in the first air chamber 42a to begin to decrease. When the pressure in the second air chamber 42b becomes higher than the pressure in the first air chamber 42a by an amount sufficient to overcome the static friction resistance of the piston 38, the piston rod 40 begins to move in the push direction. Meanwhile, as shown in FIG. 1B, the piston rod 40 moves to the maximum extension position and is held in this position with a large pull force.

After extending the piston rod 40 and performing work such as positioning the workpiece as shown in FIG. 2A and 2B, valve 16 (H) switches from the first position to the second position. That is, the process of returning the piston rod 40 begins.

During the return process, part of the air accumulated in the second air chamber 42b passes through the third check valve 52c (E) towards the first air chamber 42a. At the same time, another part of the air stored in the second air chamber 42b is discharged from the exhaust port 64 through the first speed control valve 50a (F), the second speed control valve 50b (G), and the valve 16 (H). At the same time, the air passes through the first speed control valve 50a (F), in which the flow is controlled by the first throttle valve 54a, and then passes towards the switching valve 16 (H) through the second check valve 52b of the second speed control valve 50b (G).

At the same time, the air supplied towards the first air box 42a accumulates mainly in the reservoir 68 (D). This is because before the piston rod 40 begins to retract, in the area where air can be between the third check valve 52c (E) and the first air chamber 42a, and which includes the first air chamber 42a and pipelines, the reservoir 68 (D) occupies largest space.

Then, the air pressure in the second air chamber 42b is reduced and the air pressure in the first air chamber 42a is increased. When the air pressure in the first air chamber 42a becomes higher than the air pressure in the second air chamber 42b by a predetermined amount or higher, the retraction of the piston rod 40 starts. in the most retracted position.

As shown in FIG. 4A, the second fluid circuit 10B has substantially the same construction as the first fluid circuit 10A described above, except that the third conduit 12c (C) is located between the point M1 on the first conduit 12a (B). and point M2 on the second pipeline 12b (A).

That is, in the second fluid circuit 10V, the third conduit 12c (C: bypass) branches off from a point on the first conduit 12a (B) and the third conduit 12c (C) connects to the second conduit 12b (A) at a point on the second pipeline 12b (A). That is, the third conduit (C) is located between point M1 on the first conduit 12a (B) and point M2 on the second conduit 12b (A).

The third conduit 12 c (C) is provided with a fourth check valve 52d (E) located adjacent to point M2 on the second conduit 12b (E) and a pilot check valve 56 (E) adjacent to point M1 on the first conduit 12a (B) . The fourth check valve 52d (E) allows air to pass from the second air chamber 42b towards the first air chamber 42a, but blocks the air from the first air chamber 42a towards the second air chamber 42b.

The pilot check valve 56 (E) allows air to pass from the first air chamber 42a towards the second air chamber 42b. In addition, the pilot check valve 56 (E) blocks the air passing from the second air chamber 42b towards the first air chamber 42a when no pilot pressure is equal to or greater than the set pressure, but allows air to pass from the second air chamber 42b towards the first air chamber 42a when the pilot pressure is equal to or greater than the set pressure. In other words, in the absence of pilot pressure, the pilot check valve 56 (E) acts as a check valve and allows air to pass from the first air chamber 42a towards the second air chamber 42b, but blocks air from the second air chamber 42b towards the first air chamber. chambers 42a. In the case of pilot pressure, the pilot check valve 56 (E) does not work as a check valve and allows air to flow in any direction.

The fifth check valve 52e (E) is installed at a point on the first pipeline 12a (B) between the point Ml on the first pipeline 12a (B) and the changeover valve 16 (H). The fifth check valve 52e (E) allows air to flow from the point M1 on the first pipeline 12a (B) towards the switching valve 16, but blocks the passage of air from the switching valve 16 (H) towards the point Ml on the first pipeline 12a (B). At a point between the fifth check valve 52e(E) and the changeover valve 16(H) is a pilot port 58 branching from the first conduit 12a(B) and connecting to the pilot check valve 56(E).

The valve 16 (H) in the second hydraulic circuit 10 V is also made as a two-position solenoid valve with five ports - from the first port 60a to the fifth port 60e, switchable between the first position and the second position. The first port 60a is connected to the first conduit 12a (B). The second port 60b is connected to the second conduit 12b (A).

The third port 60 c is connected to the first exhaust port 64 a to which the first silencer 63 a (I) is attached. The fourth port 60d is connected to the source 62 of the air supply. The fifth port 60e is connected to the second exhaust port 64b, to which the second muffler 63b (I) is attached.

The area outlined by the dashed line in Fig. 4A, i.e. tank 68(D), third conduit 12c (C: bypass) including fourth check valve 52d(E) and pilot check valve 56(E), first conduit 12a(B) including a fifth check valve 52e (E), a section of the second pipeline 12b (A) and a bypass passage 58 are built into the cylinder 30.

The second hydraulic circuit 10V has basically the structure described above. Below with reference to Fig. 4A-5B describe the operation of this circuit. The state in which, as shown in FIG. 4A, the valve 16 (H) is in the first position and the piston rod 40 is in the most retracted position, considered to be the initial state.

First, as shown in FIG. 4A and 4B, during the initial driving process, air from the air supply 62 is supplied to the second air chamber 42b through the second conduit 12b (A). This causes the air inside the first air chamber 42a to be discharged from the second exhaust port 64b to the outside through the first conduit 12a(B). In this case, the air passes through the second speed control valve 50b (G), in which the flow is controlled by the second throttle valve 54b, and then is supplied to the second air chamber 42b through the first check valve 52a of the first speed control valve 50a (F).

This causes the pressure in the second air chamber 42b to begin to increase and the pressure in the first air chamber 42a to begin to decrease. When the pressure in the second air chamber 42b becomes higher than the pressure in the first air chamber 42a by an amount sufficient to overcome the static friction resistance of the piston 38, the piston rod 40 begins to move in the push direction. Meanwhile, as shown in FIG. 4B, the piston rod 40 moves to the maximum extension position and is held in this position with a large pulling force.

After extending the piston rod 40 and performing work such as positioning the workpiece as shown in FIG. 5A, valve 16 (H) switches from the first position to the second position. That is, the process of returning the piston rod 40 begins.

During the return process, air from the air supply 62 passes to the section of the first pipeline 12a (B) between the fifth check valve 52e (E) and the changeover valve 16 (H). Since the fifth check valve 52e (E) blocks the passage of air, the air pressure in this section of the first pipeline 12a (B) increases. At the same time, the pressure in the pilot passage 58 connected to the first conduit 12a (B) becomes greater than or equal to a predetermined level, which causes the pilot check valve 56 (E) to stop working as a check valve.

When the pilot check valve 56 (E) stops working as a check valve, part of the air accumulated in the second air chamber 42b passes through the third conduit 12c (C: bypass) including the fourth check valve 52d (E) and the pilot check valve 56 (E), through the point M2 on the second pipeline 12b (E) and is supplied from the point M1 on the first pipeline 12a (B) towards the first air chamber 42a. At the same time, another part of the air accumulated in the second air chamber 42b is discharged from the first exhaust port 64a to the outside through the second conduit 12b (A). At the same time, the air passes through the first speed control valve 50a (F), in which the flow is controlled by the first throttle valve 54a, and then passes towards the switching valve 16 (H) through the second check valve 52b of the second speed control valve 50b (G). This causes the pressure in the second air chamber 42b to begin to decrease and the pressure in the first air chamber 42a to begin to rise. Meanwhile, the air supplied to the side of the first air chamber 42a accumulates mainly in the reservoir 68 (D).

As the pressure in the second air chamber 42b decreases, the pressure in the first air chamber 42a increases. When the pressure in the second air chamber 42b becomes equal to the pressure in the first air chamber 42a, due to operation of the fourth check valve 52d (E), the air supply from the second air chamber 42b towards the first air chamber 42a is stopped. This causes the pressure increase in the first air chamber 42a to stop. At the same time, the pressure in the second air chamber 42b continues to decrease. When the pressure in the first air chamber 42a becomes higher than the pressure in the second air chamber 42b by an amount sufficient to overcome the static friction resistance of the piston 38, the piston rod 40 begins to move in the retraction direction.

When the piston rod 40 begins to move in the retraction direction, the volume of the first air chamber 42a increases and therefore the pressure in the first air chamber 42a decreases. However, since the volume of the first air chamber 42a is substantially increased by the reservoir 68 (D), the rate of depressurization is slow. Since the pressure in the second air chamber 42b decreases at a higher rate than indicated above, the pressure in the first air chamber 42a continues to exceed the pressure in the second air chamber 42b. In addition, the sliding resistance of the piston 38 with the start of movement becomes less than the frictional resistance of the piston 38 at rest. In this way, the piston rod 40 can be easily moved in the retraction direction. Thus, the second hydraulic circuit 10 V returns to its original state, in which the piston rod 40 is in the most retracted position. The second hydraulic circuit 10 V is maintained in this state until the switching valve 16 (H) is switched again.

Below with reference to Fig. 6-19 is a description of the selection system 100 according to the present embodiment. In this description, the second conduit 12b, the first conduit 12a, and the third conduit 12c are referred to as conduit A, conduit B, and conduit C, respectively. speed and speed control valve G. The valve 16 is referred to as valve H. The silencer 63 is referred to as silencer I. In addition, each of the valves, the third check valve 52 c used in the first fluid circuit 10A, as well as the fourth check valve 52d, the fifth check valve 52e and the pilot check valve 56 used in the second fluid circuit 10 V, are referred to as a check valve. valve E.

As shown in FIG. 6, the selection system 100 includes a plurality of data bases DB1-DB8, a computer 102, an input device 104 (keyboard, mouse, and other devices), and a display 106.

The plurality of databases include, for example, a cylinder database DB1, a pipeline database DB2, a tank database DB3, a speed control valve database DB4, a check valve database DB5, a valve database DB6, a database DB7 silencer data and the DB8 data base for device combinations.

The cylinder database DB1 stores data on the cylinder 30, for example in ascending order of size (eg cylinder bore diameter D or rod diameter d), with an article number attached thereto. As shown in FIG. 7A, for example, data for cylinder 30 includes article number, cylinder bore diameter D, piston rod diameter d, fixed throttle sonic conductivity C0, static friction force Fs, kinetic friction force Fd, viscous friction coefficient, rod and piston mass, minimum operating cylinder pressure Pmin and other parameters.

The DB2 piping database stores piping data (piping A, B, and C) sorted, for example, in ascending order of size (for example, outside diameters or inside diameters) and sorted by part number. As shown in FIG. 7B, for example, piping data includes product number, external diameter De, internal diameter Di, material and other parameters.

The DB3 tank database stores data for tank D, sorted, for example, in ascending order of volume, with a part number attached to it. As shown in FIG. 7C, for example, tank D data includes item number, volume, size (maximum outside diameter and maximum length), and other parameters.

The speed control valve database DB4 stores data on the speed control valve F and the speed control valve G arranged, for example, in ascending order of size, with the article number attached to them. As shown in FIG. 8A, for example, the speed control valves F and G include part number, size, sound conductivity, and other parameters.

The check valve database DB5 stores the check valve data E, in ascending order of size, for example, with the article number attached to it. As shown in FIG. 8B, for example, check valve E data includes part number, size, sound conductivity, and other parameters.

The valve database DB6 stores the H valve data, for example in ascending size order, with the article number attached to it. As shown in FIG. 8C, for example, valve H data includes part number, size, sound conductivity, response time, and other parameters.

Silencer database DB7 stores silencer data I, for example in ascending order of size, with the article number attached to it. As shown in FIG. 8D, for example, the silencer I data includes the article number, size, sound conductivity, and other parameters.

As shown in FIG. 9, for example, the device combination database DB8 stores device combination data with a combination number attached to it. When displaying combination data along the first fluid loop 10A shown in FIG. 1A and the second fluid circuit 10V shown in FIG. 4A, for example, the combination data has a data format in which dimensions are arranged according to pipeline A, pipeline B, pipeline C, reservoir D, check valve E, speed control valve F, and speed control valve G. Each portion of the combination data differs from the others in the size of one device.

As for the H valve, an H valve having the same flow characteristic as the flow characteristic of the selected speed control valve is selected from the valve database DB6. The user, for example, makes a selection using the input device 104. In addition, a silencer 1 having a flow characteristic twice the flow characteristic of the selected speed control valve is selected from the silencer database DB7. The user, for example, also makes a selection using the input device 104.

It goes without saying that the sizes of valve H and muffler I corresponding to the combination number can be registered as in the second device combination database DB8 shown in FIG. 10, similar to other devices. In this case, the selection of valve H and muffler 1 by means of a command from the user can be dispensed with, since valve H and muffler 1 are selected automatically.

At the same time, as shown in FIG. 6, the computer 102 includes a computing unit 110, a memory unit 112, an input/output interface 114, and other structural elements. The computing unit 110 includes a processor provided with a CPU and the like. The processor executes programs stored in the memory unit 112 to implement various functions.

In this embodiment, the calculation unit 110 operates as a cylinder selection unit 120, a condition input unit 122, a first combination selection unit 124A, a second combination selection unit 124B, a characteristic calculation unit 126, a first reselection unit 128A, a second reselection unit 128B, a valve selection section 130, a silencer selection section 132, an opening degree calculation section 134, a selection result output section 136, and a communication control section 138.

The memory unit 112 includes, for example, volatile memory and non-volatile memory. The volatile memory includes, for example, RAM (random access memory), flash memory, and the like.

The cylinder selection unit 120 first reads information such as the cylinder type (round, rectangular, thin, guided, or the like) from the cylinder database DB1 upon an input command from the user, and then displays this information along with the product number for cylinder on display 106. It goes without saying that a cylinder 30 of a suitable type can be selected from the cylinder database DB1 based on the bore diameter of the cylinder, the length of the cylinder and other parameters that have been entered on command and displayed on the display 106 along with the article number for the cylinder. In addition, the cylinder selection unit 120 stores the product number for the cylinder entered at the command from the user in the memory unit 112 .

The condition input unit 122 stores various parameters entered via the input device 104 in the memory unit 112 via the communication control unit 138 . These various parameters include, for example, conditions of use and directions of operation (use: transport, press-in or clamping; installation position and direction during the drive process: horizontal and extend, horizontal and retract, vertical up and lift or vertical down and lower) , stroke conditions and pressure (stroke, maximum stroke time Tmax and supply pressure PS), pipeline conditions (pipe length L1 (left) and pipeline length L2 (right)), and load conditions (load mass Mw during the drive process, mass Mr of the load during the return process, the pressing force and the clamping force; on the outer guide: without using, using rolling, using sliding, any condition or coefficient of friction).

The first combination selection unit 124A and the second combination selection unit 124B read the combination number from the device combination database DB8 in ascending order, and then read the pipeline A, pipeline B, and pipeline C data corresponding to the read combination number from the database DB2 in ascending order. pipelines. In addition, the first combination selection unit 124A and the second combination selection unit 124B read the tank D data corresponding to the read combination number from the tank database DB3, and the check valve E data corresponding to the read combination number from the tank data base DB5. check valves. Meanwhile, the check valve E corresponding to the third check valve 52c is read for the first fluid circuit 10A, and the check valve E corresponding to the fourth check valve 52d, the fifth check valve 52e, and the pilot check valve 56 is read for the second circuit. 10 V fluid. In addition, the first combination selection unit 124A and the second combination selection unit 124B read the speed control valve F data and the speed control valve G corresponding to the read combination number from the speed control valve database DB4. After reading the above-described pieces of data, the first combination selection unit 124A and the second combination selection unit 124B start the characteristic calculation unit 126 .

The performance calculation unit 126 performs a simulation to determine various characteristics of the selected cylinder drive system (fluid circuit 10). In the simulation, the basic equations for cylinder 30, pipeline A, pipeline B, pipeline C, tank D, check valve E, speed control valve F, speed control valve G, and the like shown in FIG. 11A-11C and FIG. 12A-12D are solved by numerical calculations.

That is, the performance calculation unit 126 performs simulation based on the dimensions and the like of the cylinder, pipelines, reservoir, check valve, and speed control valves described above to determine the travel time Ts in the drive process and the post-return pressure Pr in the return process. If necessary, the characteristic calculator 126 performs numerical calculations, additionally using the valve and silencer to determine the travel time Ts during the drive process and the post-return pressure Pr during the return process.

In particular, the throttle fluid mass flow qm in the physical model of the cylinder drive system shown in FIG. 11A can be expressed by equations (1a) and (1b) as the basic equations for the throttle in FIG. 11 B. In particular, the mass flow is expressed by equation (1a) in the case of throttled flow, that is, when p2/p1≤b, and is expressed by equation (1b) in the case of subsonic flow, that is, when p2/p1>b.

Mass flow in speed control valves, valve, muffler, and other structural elements can be obtained from equations (1a) and (1b) shown in FIG. 11B. In view of changes in air temperature, state equations (2)-(4), energy equations (5)-(7), and motion equation (8) are given as master equations for the cylinder in FIG. 11C.

For the pipeline model in Fig. 12A the basic equations for the pipeline of FIG. 12 V are expressed as continuity equation (9), state equation (10), motion equation (11), and energy equation (12).

For the i-th element, which is one of the n elements obtained by dividing the pipeline into n elements, as shown in FIG. 12C, the basic equations are expressed as continuity equation (13), state equation (14), motion equation (15), and energy equation (16), as shown in FIG. 12D. Description of the symbols and subscripts of the basic equations shown in FIG. 11A-11C and 12A-12D is shown in FIG. 13.

In FIG. 14 is a graph obtained as a result of the simulation calculation in the characteristic calculation section 126 . In FIG. 14, dotted line L1, dashed line L2, and solid line L3 show, respectively, the displacement of the piston 38, the pressure in the cylinder 30 on the head side, and the pressure in the cylinder 30 on the rod side. Ts denotes the running time in the drive process. Pr denotes the pressure after the return in the return process.

At the same time, in the case where the stroke time Ts obtained as a result of the simulation performed using the selected cylinder 30 and part of the selected devices exceeds the predetermined maximum stroke time Tmax, or in the case when the post-return pressure Pr obtained from the simulation , less than or equal to the minimum operating pressure Pmin, the first reselection unit 128A reselects larger devices. That is, the first reselection section 128A adds one to the selection index (combination number) used by the first combination selection section 124A, and then starts the first first combination selection section 124A. Part of the devices described above includes pipeline A, pipeline B, pipeline C, reservoir D, check valve E, speed control valve F, and speed control valve G.

In the case that the stroke time Ts obtained from the simulation performed using all the selected devices exceeds the pre-set maximum stroke time Tmax, or in the case that the post-return pressure Pr obtained using the currently selected devices exceeds or equal to the pressure Pr after the return process obtained using the preselected devices, the second reselection unit 128B reselects the larger size devices. That is, the second reselection unit 128B adds one to the selection index (combination number) used by the first combination selection unit 124A, and then starts the first first combination selection unit 124A.

The valve selector 130 first reads information such as the external pilot valve circuit (single straight pipe type, single main pipe type, etc.) from the valve database DB6 upon an input command from the user, and then displays this information along with the valve item number on the display 106. In addition, the valve selection unit 130 stores the valve item number entered at the command from the user in the memory unit 112 .

The muffler selection unit 132 selects the muffler 1 to be connected to the valve H selected by the valve selection unit 130 . Silencer I is selected using, for example, a matching table between valve and silencer. The valve selector 130 stores the article number for the selected muffler I in the memory 112 .

The opening degree calculation unit 134 calculates the running time Ts, the average speed, the final speed, the kinetic energy and the allowable energy, as well as the traction force 90% settling time, and the like. in the process of driving the piston 38 for each opening degree of the speed control valve G. In addition, the opening degree calculation unit 134 calculates the after-return pressure Pr, running time, average speed, final speed, kinetic energy and allowable energy, and the like. in the return process of the piston 38 for each opening degree of the speed control valve F.

The selection result output unit 136 outputs the selection results made by the selection units described above to the display 106 via the communication control unit 138 to display the selection results on the display 106.

The selection results include, for example, part numbers, reduction factor, air consumption reduction, air consumption, results related to the drive process (to the speed control valve G), results related to the return process (to the speed control valve F), and See also lateral load and permissible lateral load.

The item numbers correspond to the cylinder, valve, piping, tank, speed control valves, check valve and muffler that have been selected.

The results related to the drive process (to the speed control valve G) include, for example, the stroke time Ts, the average speed, the final speed, the kinetic energy and the allowable energy, as well as the settling time of 90% of the driving force for each degree of opening. The results related to the return process (to the speed control valve F) include, for example, the pressure Pr after return, the stroke time Ts, the average speed, the final speed, as well as the kinetic energy and the allowable energy.

By commands from the selection blocks described above, etc. the data link control unit 138 loads the data on the cylinder, pipelines, devices, and the like from the database, and stores the data in the memory unit 112 via the input/output interface 114 . In addition, the communication control unit 138 outputs data (eg, graphic data, tabular data, etc.) stored in the memory unit 112 as a result of the process carried out by the selection units and the like described above to the display 106 through the interface 114 input/output.

Below with reference to Fig. 15-17 are descriptions of the processing operations in the selection system 100 according to the present embodiment.

First, in step S1 in FIG. 15, the cylinder selection unit 120 reads information such as the type of cylinder (round, rectangular, thin, guided, or the like) from the cylinder database DB1 upon an input command from the user, and then displays this information along with a product number for cylinder on display]06. The cylinder selection unit 120 stores the product number for the cylinder entered at the user's command in the memory unit 112 .

In step S2, the condition input unit 122 stores the various conditions entered via the input device 104 in the memory unit 112 via the communication control unit 138 .

In step S3, the first combination selection unit 124A selects the combination number from the device combination database DB8 in ascending order, and reads pipeline A, pipeline B, and pipeline C corresponding to the selected combination number from pipeline database DB2. In addition, the first combination selection unit 124A reads the tank D data corresponding to the selected combination number from the tank database DB3, and the check valve E data corresponding to the selected combination number from the check valve database DB5. In addition, the first combination selection unit 124A reads the data of the speed control valve F and the speed control valve G corresponding to the selected combination number from the speed control valve database DB4. Then, the first combination selection block 124A starts the characteristic calculation block 126 .

In step S4, the characteristic calculation section 126 performs simulation based on the dimensions and the like of the cylinder 30, pipeline A, pipeline B, pipeline C, reservoir D, check valve E, speed control valve F, and speed control valve G that have been selected, to thus determine the stroke time Ts in the drive process and the pressure Pr after the return in the return process.

In step S5, the first reselection unit 128A determines whether the stroke time Ts obtained in step S4 is less than or equal to the predetermined maximum stroke time Tmax. If the determination result is positive (YES in step S5), the process proceeds to step S6, and the first reselection unit 128A determines whether the return pressure Pr is less than or equal to the minimum operating pressure Pmin.

If the determination result in step S5 is negative (NO in step S5) or if the determination result in step S6 is positive (YES in step S6), the process proceeds to step S7 to reselect larger devices. That is, the first reselection section 128A adds one to the selection index (combination number) used by the first combination selection section 124A, and then starts the first first combination selection section 124A to repeat the process from step S3.

In the process from step S3 to step S6 described above, devices are selected as shown, for example, in FIG. 16. That is, for example, devices with combination numbers 1 to 5 are found not to work and thus not available for selection. Among devices with combination numbers 6 to 11, the running time Ts obtained using devices with combination numbers such as 6 and 11 is less than or equal to the maximum running time Tmax. However, since the pressure Pr after return is less than or equal to the minimum operating pressure Pmin, these devices are not selectable. Devices with combination numbers from 7 to 10 are also not selectable, since the pressure Pr after return is less than or equal to the minimum operating pressure Pmin.

Similarly, devices with combination numbers 12 to 14 are found not to work and thus not available for selection. Devices with combination numbers from 15 to 17 are not selectable because the pressure Pr after return is less than or equal to the minimum operating pressure Pmin. Devices with combination number 18 are available for selection because the stroke time Ts is less than or equal to the maximum stroke time Tmax and the pressure Pr after return is greater than the minimum working pressure Pmin.

At the same time, if the determination result in step S6 in FIG. 15 is negative (NO in step S6; as in the case of combination number 18 in the example in FIG. 16), the process proceeds to step S8 in FIG. 17. First, the valve selection unit 130 reads information, for example, about the external circuit of the pilot valve (single straight pipe type, single main pipe type, etc.) from the valve database DB6 by an input command from the user, and then displays this information together with the item number for the valve H on the display 106. In this case, the valve selection unit 130 stores the item number for the valve entered at the command from the user in the memory unit 112.

In step S9, the silencer selection unit 132 selects the silencer I connected to the valve H selected by the valve selection unit 130 from the silencer database DB7. Here, the silencer selection unit 132 stores, for example, the product number for the noise suppressor I entered at the command from the user in the memory unit 112 .

In step S10, the second combination selection section 124 B selects the combination number that was not selected in step S3 from the device combination database DB8 in ascending order, and reads the pipeline A, pipeline B, and pipeline C data corresponding to the selected combination number from DB2 database pipelines. In addition, the second combination selection block 124B reads the tank D data corresponding to the selected combination number from the tank database DB3, and the check valve E data corresponding to the selected combination number from the check valve database DB5. In addition, the second combination selection unit 124B reads the data of the speed control valve F and the speed control valve G corresponding to the selected combination number from the speed control valve database DB4. Then, the second combination selection block 124 B starts the characteristics calculation block 126 .

In step S11, the performance calculation unit 126 performs simulation based on the dimensions and the like of the cylinder 30, pipeline A, pipeline B, pipeline C, reservoir D, check valve E, speed control valve F, speed control valve G, valve H, and muffler 1 noise which have been chosen to thus determine the travel time Ts in the drive process and the pressure Pr after the return in the return process.

In step S12, the second reselection unit 128B determines whether the stroke time Ts obtained in step S11 is less than or equal to the predetermined maximum stroke time Tmax. If the determination result is positive, the process proceeds to step S13, and the second reselection unit 128B determines whether the pressure Pr after returning to #X-1 is less than or equal to the pressure Pr after returning to #X, where "#X " and "#X-1" respectively refer to the current and previous combination numbers.

If the determination result in step S12 is negative (NO in step S12) or if the determination result in step S13 is positive (YES in step S13), the process proceeds to step S14 and the second reselector 128B reselects the larger devices. That is, the second reselection section 128B adds one to the selection index (combination number) used by the second combination selection section 124B, and then starts the second combination selection section 124B to repeat the process from step S10.

If the result of the determination in step S13 is negative, in step S15, the second combination selection block 124B finally selects the device combination corresponding to the previous combination number selected just before the current combination number.

In the process from step S11 to step S14 described above, devices are selected as shown, for example, in FIG. 18. That is, all devices with combination numbers from 18 to 21 are available for selection, since the stroke time Ts is less than or equal to the maximum stroke time Tmax, and the pressure Pr after return exceeds the minimum working pressure Pmin. However, among devices with combination numbers 18 to 21, only devices with a combination number such as 21 generate a post-return pressure Pr that is lower than the post-return pressure Pr corresponding to the previous combination number. Thus, devices with combination number 20 immediately before combination number 21 are finally selected in step S15.

Then, at step S16 in FIG. 19, the opening degree calculation unit 134 starts the performance calculation unit 126, and calculates the stroke time Ts, the average speed, the final speed, the kinetic energy and the allowable energy, and the setting time of 90% of the driving force, etc. in the driving process of the piston 38 for each degree opening speed control valves F and G.

In step S17, it is determined whether the simulation has ended for each of the predetermined opening degrees. If not (NO in step S17), the process proceeds to step S18, and the opening degree calculation unit 134 changes the opening degrees of the speed control valves F and G to execute the process from step S16.

When calculating the degree of opening, the simulation is performed for each of the predetermined degrees of opening. It goes without saying that the simulation can be performed either for all degrees of opening, or for a plurality of predetermined degrees of opening.

If it is determined that the simulation for each of the predetermined opening degrees is completed in step S17 (YES in step S17), the process proceeds to step S19, and the selection result output unit 136 outputs the results of the selection made by the selection units described above to the display 106 via the selection unit 138 communication control to display the results of the selection on the display 106.

INVENTION DESCRIBED FROM AN EMBODIMENT

The following is a description of the invention, which can be understood from the above-described embodiment.

The fluid circuit selection system 100 according to the present embodiment, which is a selection system for a fluid circuit 10 including at least a cylinder 30 and a plurality of devices connected to the cylinder 30, includes a cylinder selection unit 120 for for selecting the cylinder 30, a database DB8 including combination information of a plurality of devices registered in advance in at least size order, a combination selection unit 124A (124V) for reading the combination information of a plurality of devices from the database DB8 in order size to select devices, and a reselection block 128A (128V) for reselecting devices of larger sizes in the case that the travel time Ts obtained from the simulation performed using part of the devices selected by block 124A (124V) combination selection exceeds the preset maximum the stroke time Tmax, or in the case that the simulated pressure Pr after return is less than or equal to the minimum working pressure Pmin.

In order to implement an energy-saving fluid circuit 10 that reuses exhaust air, such as a hydraulic (pneumatic) cylinder drive device, the dimensions of the devices must be appropriately selected; otherwise, it is difficult to meet the required conditions and specifications.

That is, the performance of the energy-saving fluid circuit 10 described above, which reuses exhaust air, may be degraded depending on the size of the drive units (speed control valves, piping, check valves, valves, mufflers, tanks, and the like).

Thus, the devices are selected using the database DB8, which includes information about combinations of multiple devices previously registered in at least size order. In addition, in the case where the stroke time Ts obtained as a result of the simulation performed using a part of the devices selected by the combination selection unit 124A (124V) exceeds the predetermined maximum stroke time Tmax, or in the case where the pressure Pr after return, obtained from the simulation is less than or equal to the minimum operating pressure Pmin, larger devices are reselected. As a result, drive units used in an energy-saving fluid circuit that recycles exhaust air can be appropriately sized.

The fluid circuit selection system 100 according to the present embodiment includes a valve selection unit 130 for selecting valve H by an input operation, and a silencer selection unit 132 for selecting a noise suppressor I by an input operation, wherein the valve H and the silencer I noise are part of many devices.

This is effective when the DB8 database does not store either H valve information or muffler 1 information. In addition, in the case where one valve H can be adapted to devices of different sizes, another valve H can be applied by means of an insertion operation in order to check, for example, an increase in performance compared to a permanently selected valve H.

In addition, the fluid circuit selection system 100 according to the present embodiment, which is a selection system for a fluid circuit including at least a cylinder 30 and a plurality of devices connected to the cylinder 30, includes a cylinder selection unit 120 , for selecting cylinder 30, a database DB8 including combination information of a plurality of devices registered in advance in at least order of size, a combination selection unit 124A (124B) for reading information about combinations of a plurality of devices from the database DB8 in order of size to select the devices, the first reselection unit 128A for reselecting larger size devices in the case that the travel time Ts obtained from the simulation performed using a portion of the devices selected by the combination selection unit 124A (124V) , exceeds the preset maximum stroke time Tmax, or in the case that the simulated pressure Pr after return is less than or equal to the minimum operating pressure Pmin, and a second reselection unit 128 V for reselecting larger devices in the case that the stroke time Ts obtained from the simulation performed using all selected devices exceeds the pre-set maximum stroke time Tmax, or in the case that the pressure Pr after return obtained using the devices currently selected is greater than or equal to the pressure Pr after return, obtained using pre-selected devices.

As a result, drive units used in an energy-saving fluid circuit that recycles exhaust air can be appropriately sized. In particular, in addition to the first reselector 128A, the second reselector 128B can optimize device selection. That is, in the case that the stroke time Ts exceeds the predetermined maximum stroke time Tmax, or in the case that the post-return pressure Pr obtained using the devices currently selected is greater than or equal to the post-return pressure Pr obtained using the previously selected selected devices, larger devices are reselected. As a result, the stroke time Ts can be set to a value closest to the maximum stroke time Tmax without exceeding the predetermined maximum stroke time Tmax. It is also possible to choose the combination of devices that generate the highest pressure Pr after return.

In the present embodiment, the second reselection unit 128B reselects the larger devices except for the valve H and silencer I, which were selected by the input operation.

Since valve H and muffler I have already been selected by the input operation, the second reselection block 128B optimizes the arrangements without changing valve H and muffler I. That is, the second reselection unit 128B reselects the larger devices except for the valve H and the silencer I. As a result, the selection time can be shortened.

In the present embodiment, the fluid circuit 10 includes a cylinder 30 including a first air chamber 42a and a second air chamber 42b separated by a piston 38, a valve 16 (H) for switching between a position for driving the piston 38 and a position for return process 38, a first conduit 12a(B) installed between the first air chamber 42a and valve 16(H), and a second conduit 12b(A) installed between the second air chamber 42b and valve 16(H). The tank 68 (D) is installed on the first pipeline 12a (B) next to the first air chamber (42a). Two speed control valves 50a (F) and 50b (G) are installed in series on the second conduit 12b (A).

In the process of driving the piston 38, the flow rate from the valve 16 (H) to the second air chamber 42b can be controlled by the variable throttle valve 54b of the speed control valve 50b (G). During the return of the piston 38, the outlet flow from the second air chamber 42b to the valve 16 (H) can be controlled by the adjustable throttle valve 54a of the speed control valve 50a (F). That is, the supply flow to the cylinder 30 and the discharge flow from the cylinder 30 can be controlled separately. This results in a shortening of the stroke time Ts in the drive process and an increase in the pressure Pr inside the hydro(pneumatic) cylinder after the return process, which are the desired characteristics of the fluid circuit 10. In addition, these two speed control valves 50a (F) and 50b (G) are simply installed in series on the second pipeline 12b (A), which also leads to a simplified design.

The fluid circuit selection system and the fluid circuit selection method according to the present invention are not specifically limited to the embodiment described above, and may have a wide variety of designs and implementation processes, of course, without departing from the scope of the present invention.

Claims (44)

1. A fluid circuit selection system (100) for a fluid circuit (10) including at least a cylinder (30) and a plurality of devices connected to the cylinder (30), where this fluid circuit selection system comprises: a cylinder selection block (120) for selecting a cylinder (30); a data base (DB8) including combination information of a plurality of devices previously registered in at least order of size; a combination selection unit (124A, 124B) for reading combination information of a plurality of devices from a data base (DB8) in size order to select devices; and a reselection unit (128A, 128B) for reselecting larger size devices in the event that the travel time (Ts) obtained from the simulation performed using a portion of the devices selected by the combination selection unit (124A, 124B) exceeds a predetermined the specified maximum stroke time (Tmax), or in the case when the pressure (Pr) after the return process, obtained from the simulation, is less than or equal to the minimum operating pressure (Pmin). 2. The fluid circuit selection system (100) according to claim 1, further comprising: a valve selection unit (130) for selecting a valve (H) included in the plurality of devices through an input operation; and a silencer selection unit (132) for selecting the noise suppressor (1) included in the plurality of devices by an input operation. 3. System (100) for selecting a fluid circuit according to claim 1, characterized in that fluid circuit (10) includes: a cylinder (30) including a first air chamber (42a) and a second air chamber (42b) separated by a piston (38); a valve (16) for switching between a position for the drive process of the piston (38) and a position for the return process of the piston (38); the first (12a) flow channel located between the first air chamber (42a) and the valve (16); and the second (12b) flow channel located between the second air chamber (42b) and the valve (16), a reservoir (68) which is installed in the first flow channel (12a) next to the first air chamber (42a), and two speed control valves (50a, 50b) installed in series in the second flow channel (12b). 4. Fluid circuit selection system (100) for a fluid circuit (10) including at least a cylinder (30) and a plurality of devices connected to the cylinder (30), where this fluid circuit selection system comprises: a cylinder selection block (120) for selecting a cylinder (30); a data base (DB8) including combination information of a plurality of devices previously registered in at least order of size; a combination selection unit (124A, 124B) for reading combination information of a plurality of devices from a data base (DB8) in size order to select devices; a first reselection unit (128A) for reselecting larger size devices when the stroke time (Ts) obtained from a simulation performed using a portion of the devices selected by the combination selection unit (124A, 124B) exceeds a predetermined the maximum stroke time (Tmax), or in the case when the pressure (Pr) after the return process, obtained from the simulation, is less than or equal to the minimum operating pressure (Pmin); and a second reselection unit (128B) for reselecting larger devices when the stroke time (Ts) obtained from the simulation performed using all the selected devices exceeds a predetermined maximum stroke time (Tmax), or when the pressure (Pr) after the return process, obtained using the devices currently selected, is greater than or equal to the pressure (Pr) after the return process, obtained using the previously selected devices. 5. The fluid circuit selection system (100) according to claim 4, further comprising: a valve selection unit (130) for selecting a valve (H) included in the plurality of devices through an input operation; and a silencer selection unit (132) for selecting the noise suppressor (I) included in the plurality of devices by an input operation. 6. System (100) for selecting a fluid circuit according to claim 4, characterized in that the second reselection unit (128B) reselects the larger devices except for the valve (H) and silencer (I) that were selected by the input operation. 7. System (100) for selecting a fluid circuit according to claim 4, characterized in that fluid circuit (10) includes: a cylinder (30) including a first air chamber (42a) and a second air chamber (42b) separated by a piston (38); a valve (16) for switching between a position for the drive process of the piston (38) and a position for the return process of the piston (38); the first (12a) flow channel located between the first air chamber (42a) and the valve (16); and the second (12b) flow channel located between the second air chamber (42b) and the valve (16), a reservoir (68) which is installed in the first flow channel (12a) next to the first air chamber (42a), and two speed control valves (50a, 50b) installed in series in the second flow channel (12b). 8. A fluid circuit selection method for a fluid circuit (10) including at least a cylinder (30) and a plurality of devices connected to the cylinder (30), where this fluid circuit selection method comprises: a cylinder selection step of selecting a cylinder (30); a combination selection step of reading combination information of a plurality of devices in order of size from a database (DB8) including information of combinations of a plurality of devices registered in advance in at least size order to select devices; and a reselection step of reselecting larger size devices in the case where the travel time (Ts) obtained from the simulation performed using a portion of the devices selected in the combination selection step exceeds a predetermined maximum travel time (Tmax), or in the case when the pressure (Pr) after the return process, obtained as a result of the simulation, is less than or equal to the minimum working pressure (Pmin). 9. A fluid circuit selection method for a fluid circuit (10) including at least a cylinder (30) and a plurality of devices connected to the cylinder (30), where this fluid circuit selection method comprises: a cylinder selection step of selecting a cylinder (30); a combination selection step of reading combination information of a plurality of devices in order of size from a database (DB8) including information of combinations of a plurality of devices registered in advance in at least size order to select devices; a first reselection step of reselecting larger size devices in the case where the stroke time (Ts) obtained from the simulation performed using a portion of the devices selected in the combination selection step exceeds a predetermined maximum stroke time (Tmax), or in the case where the pressure (Pr) after the return process, obtained as a result of the simulation, is less than or equal to the minimum operating pressure (Pmin); and a second reselection step consisting in reselecting larger devices in the case where the travel time (Ts) obtained from the simulation performed using all the selected devices exceeds a predetermined maximum travel time (Tmax) or in the case where the pressure (Pr) after the return process, obtained using the devices currently selected, is greater than or equal to the pressure (Pr) after the return process, obtained using the previously selected devices.

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