JP2910363B2 - Pulse generation circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulse generating circuit referred to as a fluid pulse generator or a fluid oscillator, and more particularly, to generating and stopping three or more pulses in a predetermined order only by a mechanical structure. The present invention also relates to a pulse generation circuit having a configuration in which pulse generation is started in a predetermined order even when the system is restarted after the operation.

[0002]

2. Description of the Related Art Conventionally, as a circuit for generating a pulse signal of a fluid only by a mechanical structure without using electrical means, for example, as shown in FIG. A pulse generating valve as shown in FIG. 8 is known. That is, as shown in FIGS. 8A to 8D, the pulse generating valve includes two three-port two-way spring return type pneumatic or hydraulic operating valves 111 and 112 and two variable type with a check valve, for example. Flow control valves 113, 11 with check valves such as needle valves (throttle valves)
4 are combined. The pulse generating valve is shown in FIGS.
(D) are operated in order, and pulse signals are respectively output from the actuator pipes or the output pipes A and B. Externally, the above circuits are integrally formed as shown in FIG. It was formed.

The operation of such a variable pulse generating valve will be described in detail. In the figure, P is an air pressure source connection part, and R is an exhaust part. First, in FIG. 1A, when air is fed from the air pressure source connection portion P, this air reaches the output port A via one operation valve 111 in which the port ap and the port bp communicate with each other, and is connected to the output port A. Piping D branched from piping C
Through the flow control valve 113 with one check valve, the flow is controlled by the flow control valve 113 with check valve, and the flow is supplied to the other operation valve 112. The other operation valve 112 to which the air is supplied is operated, and the port cp and the port dp are in communication with each other as shown in FIG. In this state, the air pumped from the air pressure source connection portion P reaches the output port B via the other operation valve 112 in which the port cp and the port dp communicate. In this state, air reaches the other flow control valve with check valve 114 via the pipe F branched from the pipe E to the output port B, and the flow is controlled by the flow control valve with check valve 114 so that one air flow is controlled. It is supplied to the operation valve 111. One of the operation valves 111 to which the air is supplied is operated, and the port ep and the port fp are in communication with each other as shown in FIG. In this state, the air pumped from the air pressure source connection portion P does not reach the output port A, and the air supplied to the pipe D flows to the exhaust portion R via the operation valve 111 in which the port ep and the port fp communicate. It is exhausted. As a result, the air pressure does not act on the operation valve 112 as shown in FIG.
The port 12 is returned to a state where the port gp and the port hp communicate with each other by the spring force, so that the air is not supplied to the output port B and the port gp and the port hp
And the air supplied to the pipe F is discharged to the exhaust part R via the operation valve 111 in communication between the port gp and the port hp. As a result, the operating valve 1
11 is returned to a state in which the port ap and the port bp communicate with each other by the spring force, and both the operation valves 111 and 112 return to the initial state of FIG.

[0004] By repeating such an operation,
A state where air is supplied from the output port A and a state where air is supplied from the output port B are intermittently obtained.
Are output as pulse signals. In this case, if the flow control valves with check valves 113 and 114 are throttled to control the flow rate to a small flow rate, a slow pulse signal output is obtained. If the flow control valves with check valves 113 and 114 are opened to control the flow rate to a large flow rate, Thus, a fast pulse signal output can be obtained.

[0005] Such a pulse generating valve is used to generate a variable signal in a control system, and is used for a rapid movement of a diaphragm cylinder or a single-acting or double-acting cylinder. The rapid stroke movement of the piston rod is used for exciting a vibrator conveyor, hitting a dust suction device and a hopper, operating a vibration sieve device, and the like.

In this type of pulse generation control, when starting a device having a plurality of cylinders, for example, it is important for the control of the device that the operation at the start time always starts from a predetermined operation. Using multiple air jets provided on an inclined surface such as a chute that conveys powders, etc., in order to blow out the jet air from the lower jet and then jet the jet air from the upper jet, Gas is intermittently blown from top to bottom,
In the case of smooth transportation of powders and the like, a plurality of pulses are generated in a predetermined order, and even when restarting after stopping, pulse generation is always started in a predetermined order. A pulse generation circuit is required.

[0007]

However, in the above-described pulse generation circuit, when three or more pulses are generated, only two or more circuits shown in the figure must be used in combination. Regardless of how the flow control valve with a check valve is adjusted, the same synchronization pulse is generated or a random pulse is generated respectively, and the pulse cannot be output sequentially from a predetermined output port. There is.

In order to solve this problem, for example, a three-port two-way spring return type operation valve on the output port side in FIG. 8 is arranged in multiple stages, and opening control is performed so that each operation valve is opened one after another. The flow path is branched from the output port immediately before, and FIG.
The output ports A and F shown in FIG.
Although pulses can be generated in the order of B and C, the output of the output port A is not interrupted until the pulse of the output port C is output, and the period of each pulse is different.

In any of the above-described pulse generation circuits, when the connection destination of the output port is a closed system such as a cylinder, when the pulse generation circuit is restarted after being stopped, the pulse generation circuit is started from a stopped state. There is a risk of doing
When restarting, there is a problem that pulse generation cannot be started again from a predetermined output port in order (particularly in the states of FIGS. 8B and 8C).

In view of the above problems, the present invention generates three or more pulses sequentially in a predetermined order only by using a mechanical structure, and can arbitrarily adjust the pulse period. It is another object of the present invention to provide a pulse generation circuit that can start pulse generation in a predetermined order even at the time of restart.

[0011]

Therefore, a pulse generation circuit according to a first aspect of the present invention provides a pulse generation circuit which is provided with a fluid pressure control valve which is opened and closed by a fluid control signal, and which receives a fluid pressure signal. An OR element having a delay valve and the other input port that can be switched from a closed state in which the upstream flow path is closed and a downstream flow path is opened after a predetermined time to an open state in which the upstream flow path and the downstream flow path are communicated. An open control flow path for transmitting a fluid control signal for opening the fluid pressure operated valve to the fluid pressure operated valve, and a fluid control signal for closing the fluid pressure operated valve to the fluid pressure operated valve. A first output unit comprising a closed control flow path for transmitting to the operation valve, an output flow path provided with a fluid pressure operation valve which is opened and closed by a fluid control signal, and an upstream after a predetermined time when the fluid pressure signal is transmitted Close the side flow path and open the downstream flow path. A delay valve is provided which can be switched from a closed state to an open state communicating the upstream flow path and the downstream flow path, and an open control for transmitting a fluid control signal for opening the fluid pressure operated valve to the fluid pressure operated valve is provided to the fluid pressure operated valve A plurality of second output units each comprising a flow path and a closed control flow path that transmits a fluid control signal for closing the fluid pressure operated valve from an OR element outlet to the fluid pressure operated valve, and A fluid pressure signal flow between output units that branches from an output flow path downstream of a hydraulic pressure control valve of the output unit and transmits a portion of the fluid in the output flow path to the delay valve of the next output unit as the fluid pressure signal. A path is provided, and between the first output unit and the next second output unit, the closed control flow path of the first output unit is connected to the output flow path of the second output unit downstream of the fluid pressure operation valve. Forked and the rest of each Between the power unit,
In other words, between the second output units and between the last second output unit and the first output unit, the branch is made from the output flow path downstream of the fluid pressure control valve and reaches the OR element inlet of the previous output unit. Switching means for providing a closed control flow path and further selectively connecting the flow path from the fluid source to one of the first supply path and the second supply path and opening the other supply path which is not selected; A first supply path, the open control flow path upstream of the delay valve of each output unit and the output flow path upstream of the fluid pressure operation valve, and a second supply path.
A reset flow path was provided for communicating the supply path with another inlet of the OR element of each output unit.

A pulse generating circuit according to a second aspect of the present invention has an open state in which the upstream flow path and the downstream flow path are communicated by a fluid control signal, and a closed state in which the upstream flow path is closed and the downstream flow path is opened. An output flow path provided with a fluid pressure control valve that is switched between a closed state that closes an upstream flow path and opens a downstream flow path after a predetermined time when a fluid pressure signal is transmitted from a closed state to an upstream side and a downstream side. Open control for sequentially transmitting a fluid control signal for opening the fluid pressure operated valve to the fluid pressure operated valve, the delay valve being switched to an open state communicating with the side and an OR element having the other input port being sequentially provided. A first output unit comprising a flow path, a closed control flow path for transmitting a fluid control signal for closing the fluid pressure operated valve to the fluid pressure operated valve, and an upstream flow path and a downstream side according to the fluid control signal. The open state that communicates with the flow path and the upstream flow path An output flow path provided with a fluid pressure control valve that is switched to a closed state that closes and opens a downstream flow path, and closes an upstream flow path after a predetermined time when a fluid pressure signal is transmitted and closes the downstream flow path. A delay valve is provided which can be switched from a closed state in which the flow path is opened to an open state in which the upstream side and the downstream side are communicated, and an opening for transmitting a fluid control signal for opening the fluid pressure operated valve to the fluid pressure operated valve. A control channel,
A plurality of second output units each comprising a closed control flow path for transmitting a fluid control signal for closing the fluid pressure operated valve from an OR element outlet to the fluid pressure operated valve; And a fluid pressure signal flow path branched from an output flow path downstream of the fluid pressure operation valve of the output unit and transmitting a part of the fluid in the output flow path as the above-described fluid pressure signal to the delay valve of the next output unit is provided. Together, between the first output unit and the next second output unit, the closed control flow path of the first output unit is branched from the output flow path of the second output unit downstream of the fluid pressure operation valve, Between the remaining output units, that is, between the second output units and between the last second output unit and the first output unit, there is a branch from the output flow path downstream of the fluid pressure control valve to the previous output path. Output unit A closed control flow path leading to the inlet of the OR element, and a flow path from a fluid source is selectively connected to one of the first supply path and the second supply path and the other is not selected. Switching means for opening the supply path, providing communication between the first supply path, the open control flow path upstream of the delay valve of each output unit and the output flow path upstream of the fluid pressure control valve, and And O of each output unit
A pulse generation circuit having a reset flow path communicating with another entrance of an R element.

In particular, the delay valve in each of the above pulse generating circuits has a structure in which a throttle valve, an accumulator, and a three-port two-way spring return type fluid pressure operated valve are connected in series, and the connection port on the throttle valve side is provided. When the fluid pressure signal is transmitted from the first port and the accumulator pressure increases after a predetermined time, the first port of the fluid pressure operated valve is closed and the second port is opened via the third port from the closed state to the first port. And the second port can be switched to an open state in which communication is established.

[0014]

The pulse generation circuit according to the first invention is intended for a pulse output destination such as supplying a fluid to an ejection port such as a chute, and the output destination of the pulse is an open system. The generation circuit is intended for any of those in which the output destination of the pulse is an open system and, for example, those in which the output destination of the pulse is a closed system such as a cylinder. In the reset state, the fluid pressure of the fluid source is applied to the OR element of each output unit via the switching means, the second supply path, and the reset flow path. The fluid pressure is transmitted to the fluid pressure control valve as a fluid control signal for opening the fluid pressure control valve of the first output unit. In the second output unit, OR
The fluid pressure is transmitted from the element via the closed control channel to the fluid pressure control valve as a fluid control signal for closing the fluid pressure control valve of the second output unit. Therefore, the fluid pressure control valve of the first output unit is open and the fluid pressure control valve of the second output unit is closed.

In this state, when the switching means is switched, the second supply path is cut off from the fluid source, and the first supply path and the fluid source are in communication with each other, and the second supply path is opened, and the fluid source is opened. Fluid pressure has disappeared. Fluid pressure from the fluid source is transmitted from the first supply path to each delay valve via the open control flow path of each output unit and to each hydraulic pressure control valve via the output flow path.

Since the fluid pressure control valve of the first output unit is in the open state, the fluid of the fluid source is output to the output flow path downstream of the fluid pressure control valve of the first output unit. Then, a part of the fluid is transmitted to the delay valve of the next second output unit as a fluid pressure signal to the fluid pressure signal passage branched from the output passage. The second in which the fluid pressure signal was transmitted
After a predetermined time, the delay valve of the output unit switches from the closed state to the open state communicating the upstream side and the downstream side of the open control flow path of the second output unit, and the open control flow path reaching the delay valve. The fluid pressure is transmitted to the fluid pressure control valve of the second output unit as a fluid control signal for opening the fluid pressure control valve.

The fluid pressure operated valve in the open state outputs the fluid from the fluid source to an output flow path downstream of the fluid pressure operated valve of the second output unit. A part of the fluid passes through a closed control flow path and a fluid pressure signal flow path, each of which is branched from the output flow path, and one of the fluids closes the hydraulic pressure operation valve of the first output unit. The other is transmitted as a fluid control signal and the other is transmitted as a fluid pressure signal to the delay valve of the next second output unit. As a result, the fluid pressure control valve of the first output unit is closed, the fluid output from the output flow path of the first output unit is stopped, and the delay valve of the next output unit is opened after a predetermined time. .

Similarly, the delay valve of the output unit, to which the fluid pressure signal has been transmitted, transmits the fluid control signal to the fluid pressure operation valve of the output unit via the open control flow path after a predetermined period of time. The opened hydraulic pressure control valve outputs the fluid of the fluid source to the downstream output flow path, and a part of the fluid flows through the closed control flow path and the fluid pressure signal flow path, respectively, Is transmitted as a fluid control signal to close the fluid pressure operation valve of the output unit, and the other is transmitted as a fluid pressure signal to the delay valve of the next output unit, as a result, through the output flow path of each output unit. Each outputs a pulse signal.

When the switching means is switched again while the pulse signal is being output through the output flow path of each output unit, the first supply path is cut off from the fluid source, and the second supply path is disconnected. When the fluid source is in communication with the fluid source, the first supply path is opened and the fluid pressure of the fluid source is lost, the output of the pulse signal is stopped, and the fluid pressure from the fluid source is reduced to the second supply pressure. Is transmitted to the fluid pressure control valve of each output unit via the path and the reset flow path of each output unit and the OR element, the fluid pressure control valve of the first output unit is opened, and the fluid pressure control valve of the second output unit is closed. State.

Therefore, the pulse generation circuit according to any one of the first and second aspects of the present invention always has the first
The pulse generation is started again from the output unit in order, and the fluid is output from each output unit, and at the same time, through the closed control flow path and the fluid pressure signal flow path, one is operated by the fluid pressure operation valve of the previous output unit. It is transmitted as a fluid control signal for closing and the other is transmitted as a fluid pressure signal to the delay valve of the next output unit, so that the fluid output time of each output unit does not differ and by adjusting the delay valve of each output unit A pulse signal having the same cycle can be output from each output unit, or the pulse cycle from each output unit can be changed.

In the pulse generating circuit according to the second aspect of the present invention, the fluid pressure control valve closes the upstream output flow path and opens the downstream output flow path in the closed state, so that the pulse signal is generated. Even when the output destination is a closed system, a fluid control signal is sent to the hydraulic pressure control valve via the open control flow path, and when the hydraulic pressure control valve is opened, the downstream output flow path of the next output unit is opened. Since the fluid pressure does not remain in the closed control flow path that branches off from the control valve and sends a closed fluid control signal to the fluid pressure operated valve, the fluid pressure operated valve can be opened smoothly.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing one embodiment of the pulse generation circuit of the first invention. That is, in the drawing, a filter 22, a pressure reducing valve 23, a main switch 24, a flow control valve 25, and a start switch 26 are connected to an air source (fluid source), and air from the air source is pressure-controlled by these fluid elements. The flow rate is adjusted and supplied to the pulse generation circuit.

The pulse generating circuit includes an output flow path 2 provided with a two-port two-way pneumatically operated valve (hereinafter referred to as a pneumatically operated valve) 1 as a hydraulically operated valve that is opened and closed by a fluid control signal, When a pressure signal is transmitted, the delay valve is switched from a closed state in which the upstream flow path is closed and a downstream flow path is opened after a predetermined time to an open state in which the upstream flow path and the downstream flow path are communicated. A timer circuit 3 and a high pressure priority type shuttle valve (hereinafter, referred to as a shuttle valve) 4 as an OR element having the other input port are sequentially provided, and an air control signal for opening the pneumatic operation valve 1 is supplied to the pneumatic operation. Open control flow path 5 for transmitting to valve 1 and pneumatically operated valve 1
And a first output unit 7 comprising a closed control flow path 6 for transmitting an air control signal for closing the valve to the pneumatic operation valve 1.

The pulse generating circuit has an output passage 9 provided with a pneumatic operation valve 8 which is opened and closed by a pneumatic control signal. A timer circuit 10 is provided for switching from a closed state in which the downstream flow path is opened to an open state in which the upstream flow path and the downstream flow path are communicated.
An open control flow path 11 for transmitting a pneumatic control signal to open the pneumatically operated valve 8 to the pneumatically operated valve 8 and an air control signal for closing the pneumatically operated valve 8 to the pneumatically operated valve 8 from the shuttle valve 12 outlet And two second output units 14 each including a closed control flow path 13.

Also, a part of the air in the output channels 2, 9, 9 is branched from the output channels 2, 9, 9 downstream of the pneumatic operation valves 1, 8, 8 of the output units 7, 14, 14. Pressure signal flow path 1 for transmitting to the timer circuits 10, 10, 3 of the next output units 14, 14, 7 as the fluid pressure signal
5, 15, and 15 are provided. Further, between the first output unit 7 and the next second output unit 14, the closed control flow path 6 of the first output unit 7 is
The output unit 14 is branched from the output flow path 9 downstream of the pneumatic operation valve 8 and is connected between the remaining output units, that is,
Between the second output units 14 and between the final second output unit 14 and the first output unit 7, the output units 9, 2, which are branched from the output channels 9, 2 downstream of the pneumatic operation valves 8, 1, are connected to the previous output unit 14. , 14 are provided with closed control flow paths 16, 16 leading to the inlets of the shuttle valves 12, 12, respectively, and a flow path from an air source is selectively connected to one of the first supply path 17 and the second supply path 18. A 5-port 2-way spring-return type pneumatically operated valve with manual override (hereinafter referred to as a "pneumatically operated switching valve 19") is provided as switching means for opening the other supply path which has not been selected and is not selected. I have. Also, the first supply path 17 and the open control flow paths 5, 11, 11 upstream of the timer circuits 3, 10, 10 of the output units 7, 14, 14 and the pneumatic operation valves 1, 8, 8
The upstream output flow paths 2, 9, 9 are communicated with each other;
Reset flow paths 20, 20, 20 are provided for communicating the supply path 18 with the other inlets of the shuttle valves 4, 12, 12 of the output units 7, 14, 14.

In the pulse generating circuit having such a configuration, in the reset state, the switching pneumatic operation valve 19 and the second supply path 1
8 and the output unit 7 via the reset flow path 20.
The fluid pressure of the air source is applied to the shuttle valves 4, 12, 12 of the 14, 14. In the first output unit 7, the air pressure is applied from the shuttle valve 4 via the open control flow path 5 to the first output unit. 7 is transmitted to the pneumatically operated valve 1 as an air control signal for opening the pneumatically operated valve 1. In the second output units 14, 14, the shuttle valves 12, 1
2, the air pressure is transmitted to the pneumatic operation valve 8 as a pneumatic control signal for closing the pneumatic operation valves 8, 8 of the second output units 14, 14 through the closed control flow paths 13, 13. Therefore, the pneumatic operation valve 1 of the first output unit 7
Is opened, and the pneumatic operation valve 8 of the second output units 14, 14 is closed.

When the switching air pressure control valve 19 is switched in this state, the second supply passage 18 is cut off from the air source,
The supply path 17 and the air source are in communication with each other, the second supply path 18 is opened, and the air pressure of the air source is lost. The fluid pressure from the fluid source is supplied from the first supply passage 17 to the open control passages 5, 11,, of each of the output units 7, 14, 14.
It is transmitted to each of the pneumatically operated valves 1, 8, and 8 via the respective timer circuits 3, 10, and 10 and the output flow paths 2, 9, and 9 via the reference numeral 11.

Since the pneumatic operation valve 1 of the first output unit 7 is open, the air from the air source is output to the output flow path 2 downstream of the pneumatic operation valve 1 of the first output unit 7. Then, a part of the air is transmitted as an air pressure signal to the next timer circuit 10 of the second output unit 14 to the fluid pressure signal flow path 15 branched from the output flow path 2.

The timer circuit 10 of the second output unit 14 to which the air pressure signal has been transmitted changes from the closed state after a predetermined time to the open state connecting the upstream side and the downstream side of the open control flow path 11 of the second output unit 14. To timer circuit 10
The air pressure of the open control flow path 11 that has reached the above is transmitted to the pneumatic operation valve 8 of the second output unit 14 as an air control signal for opening the pneumatic operation valve 8.

The opened pneumatic operation valve 8 outputs the air from the air source to the output flow path 9 downstream of the pneumatic operation valve 8 of the second output unit 14. A part of the air flows through the closed control flow path 6 and the fluid pressure signal flow path 15 branched from the output flow path 9, and one of the air flows into the pneumatic operation valve 1 of the first output unit 7. Is transmitted as a pneumatic control signal for closing the other, and the other is transmitted to the next timer circuit 10 of the second output unit 14 as a pneumatic signal. As a result, the pneumatically operated valve 1 of the first output unit 7 is closed,
The air output from the output flow path 2 of the first output unit 7 is stopped, and the timer circuit 10 of the next output unit 14 is opened after a predetermined time.

Similarly, the delay valve 1 of the output unit 14 (7, 14,...) To which the fluid pressure signal has been transmitted.
0 (2, 10,...) Is the open control flow path 1 after a predetermined time.
1 (5, 11,...) Through the fluid pressure control valve 8 of the output unit 14 (7, 14,...).
(1, 8...) To be in an open state, and the opened pneumatic operation valve 8 (1, 8,...) Transfers the air of the air source to the downstream output flow path 9 (2, 9,. ..) And a part of the air is respectively closed control passages 16 and 13 (16.
, 13, and the fluid pressure signal flow path 15 (15, 1
5,...), One of which is the previous output unit 14
(14, 7...) Pneumatically operated valve 8 (8, 1,...)
) Is transmitted as a pneumatic control signal for closing the other, and the other is transmitted as a pneumatic signal to the delay valve 3 (10, 10, ...) of the next output unit 7 (14, 14, ...). As a result, pulse signals are output via the output channels 2, 9, 9 of the output units 7, 14, 14, respectively.

When the switching pneumatic operation valve 19 is switched again while the pulse signals are being output through the output channels 2, 9, 9 of the output units 7, 14, 14, respectively, the first The supply path 17 is cut off from the air source, and the second supply path 18 communicates with the air source.
When the first supply path 17 is opened and the air pressure of the air source is lost, the output of the pulse signal is stopped, and the air pressure from the air source is applied to the second supply path 18 and the output units 7, 14, 14. Each output unit 7, 1 is connected to the reset flow path 20, 20, 20, and the shuttle valve 4, 12, 12, respectively.
The pneumatically operated valves 1, 8 and 8 of the first and second output units 14 and 14 are opened and the pneumatically operated valves 8 and 8 of the second output units 14 and 14 are closed.

Therefore, in the pulse generating circuit having such a configuration, when restarting, the pulse generation is always started again from the first output unit 7 in order, and air is output from each of the output units 7, 14, and 14 at the same time. One is transmitted as a pneumatic control signal for closing the pneumatic operation valve of the previous output unit via the closed control flow paths 6, 16, 13, 16 and 13 and the fluid pressure signal flow paths 15, 15, 15, respectively. And the other is transmitted as a pneumatic signal to the timer circuit of the next output unit.
Pulse signals of the same cycle are output from the output units 7, 1 and 1 by adjusting the timer circuits 3, 10, and 10 of the output units 7, 14, and 14 without the air output times of the output units 7, 14 and 14 being different.
4 and the pulse period from each of the output units 7 and 14 can be changed.

There are various types of timer circuits 3 and 10 in the above description, and an example is shown in FIG. This is because the throttle valve 30 and the accumulator 3
This is a configuration in which the 1-port and 3-port 2-way spring return type fluid pressure operated valve 32 are connected in series, and when the fluid pressure signal is continuously transmitted from the connection port Z on the throttle valve 30 side, the pressure in the accumulator 31 becomes a predetermined value. As a result, the first port P and the second port A are closed from the closed state in which the first port P of the fluid pressure operated valve 32 is closed and the second port A is opened via the third port R. And an open state in which the communication is established.

FIG. 3 is a circuit diagram showing an embodiment of the pulse generating circuit according to the second invention. That is, the pulse generation circuit of this embodiment is different from the pulse generation circuit of the embodiment of FIG.
The fluid pressure operation valves provided in the output passage 2 and the output passage 9 in each of the output units 7 and 14 are different. In other words, the output flow path 2 can be switched between an open state in which the upstream flow path and the downstream flow path are communicated and a closed state in which the upstream flow path is closed and the downstream flow path is opened by the fluid control signal. A three-port two-way pneumatic operation valve 41 (hereinafter, referred to as pneumatic operation valve 41) as a fluid pressure operation valve is provided.

The output flow path 9 has an open state in which the upstream flow path and the downstream flow path are communicated by the fluid control signal, and a closed state in which the upstream flow path is closed and the downstream flow path is opened. 3 port 2-way pneumatic operation valve 48 (hereinafter referred to as pneumatic operation valve 48) as a fluid pressure operation valve switched to
Is provided. In this embodiment, the configuration other than the configuration in which the pneumatic operation valve 41 and the pneumatic operation valve 48 are interposed in the output flow paths 2 and 9 is the same as the embodiment in FIG.
Since the operation is the same, the description is omitted.

In the pulse generating circuit having such a configuration,
The same operation and effect as those of the embodiment of FIG. 1 are obtained, and when restarting, the pulse generation is started again from the first output unit 7 in order, and the fluid output time of each output unit 7, 14 is different. Instead, by adjusting the timer circuits 3 and 10 of the output units 7 and 14, pulse signals having the same period can be output from the output units 7 and 14, and the pulse period from the output units 7 and 14 can be respectively changed. .

In particular, in this embodiment, the pneumatic operation valves 41, 48, and 48 close the upstream flow path and open the downstream flow path in the closed state.
Even if the output port is connected to a closed system such as a cylinder, an air control signal is sent to the pneumatic operation valves 41, 48, 48 via the open control flow paths 5, 11, 11, and the pneumatic operation valves 41, 48, 48 are sent. When opening 48, 48, there is no air pressure remaining in the closed control flow path that branches off from the downstream output flow path of the next output unit and sends a closed air control signal to the fluid pressure operation valve. The pneumatic operation valve can be opened smoothly.

In each of the embodiments, an example in which two second output units 14 are provided has been described. However, a plurality of second output units 14 may be provided according to the number of output sides. Good. In addition, the pulse generation circuit according to the present invention described with reference to each of the embodiments is particularly applicable to a powder or granule used in a dispensing apparatus for measuring a plurality of powders as solid-containing fluids and obtaining a required composition. A great effect can be obtained by applying the present invention to the transfer device.

That is, in the above-mentioned blending apparatus, a plurality of air outlets provided on an inclined surface such as a chute for transporting a granular material or the like are used. In the case where the gas is intermittently blown from the bottom to the top of the outlet so as to blow out the air from the outlet, and the transportation of the powder and the like is smooth, a plurality of pulses are applied in a predetermined order. A pulse generating circuit that always starts pulse generation in a predetermined order is required at the time of restart after generating and stopping, but according to each of the above embodiments, a predetermined pulse is generated only by a mechanical structure. Even when three or more pulses are generated in order and restarted after stopping, the pulse generation is started in a predetermined order, and the transportation of the granular material can be performed extremely efficiently and reliably. .

In each of the above embodiments, air is used as an example of the fluid pulse signal. However, an inert gas such as nitrogen or carbon dioxide may be used instead of air. Needless to say, liquid such as oil used for hydraulic equipment may be used instead of gas. Further, the delay valves (timer circuits 3 and 10) in each embodiment are not limited to the configurations of the embodiments, and various commercially available delay valves can be used.

For example, the delay valve shown in FIG. 4 is a one-shot master valve which generates a short pulse from a continuous pulse. When pressure is applied, ports 61 and 62 are connected, and at the same time, the control pressure is controlled. Gradually rises through the nozzle and switches the valve. As a result, the port 61 is closed, and the port 62 and the air are exhausted. The switching return of the valve cannot be performed unless the port 1 is exhausted. In addition, X of FIG. 4 shows an end cap, and is for attaching an accumulator as needed.

The delay valve shown in FIG. 5 comprises a pneumatic mechanical timer and a 3 / 2-way control valve and is used as a timer valve. The delay valve in FIG. 6 is configured to switch after a signal is transmitted to the connection port 63 and a set time has elapsed. The delay valve in FIG. 7 is a long delay timer, and is configured by combining a pneumatic pulse generator in seconds and a preset counter.

As described above, the present invention has been described with reference to the specific embodiments. However, the present invention is not limited to these embodiments, and is attached to the present invention by a person skilled in the art. It should be noted that various changes and modifications can be made without departing from the scope of the claims.

[0045]

As described above, according to the pulse generating circuits of the first and second aspects of the present invention, three or more pulses can be generated in a predetermined order only by a mechanical structure. Also, when restarting after stopping, pulse generation can be started in a predetermined order.

In particular, according to the second aspect of the present invention, even if the output destination of the pulse signal is a closed system, the fluid control signal is sent to the fluid pressure control valve through the open control flow path, When the valve is opened, the fluid pressure does not remain in the closed control flow path that branches off from the downstream output flow path of the next output unit and sends a closed fluid control signal to the fluid pressure operation valve. There is an advantage that the fluid pressure control valve can be opened smoothly.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of a pulse generation circuit of the present invention.

FIG. 2 is a diagram showing a configuration of a delay valve (timer circuit) in the embodiment.

FIG. 3 is a circuit diagram showing another embodiment.

FIG. 4 is a diagram showing another example of the delay valve.

FIG. 5 is a diagram showing another example of the delay valve.

FIG. 6 is a diagram showing another example of the delay valve.

FIG. 7 is a diagram showing another example of the delay valve.

FIG. 8 is a circuit diagram showing one embodiment of a conventional pulse generation circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pneumatic operation valve (fluid pressure operation valve) 2 Output flow path 3 Timer circuit (delay valve) 4 Shuttle valve (OR element) 5 Open control flow path 6 Close control flow path 7 First output unit 8 Pneumatic operation valve (fluid pressure) 9 Operating flow path 10 Timer circuit (delay valve) 11 Open control flow path 12 Shuttle valve (OR element) 13 Closed control flow path 14 Second output unit 15 Fluid pressure signal flow path 16 Closed control flow path 17 First Supply path 18 Second supply path 19 Pneumatically operated valve for switching (switching means) 20 Reset flow path 41 Pneumatically operated valve (fluid pressure operated valve) 48 Pneumatically operated valve (fluid pressure operated valve)

Claims (4)

(57) [Claims] 1. An output passage provided with a fluid pressure control valve which is opened and closed by a fluid control signal, and an upstream passage closed and a downstream passage opened after a predetermined time when the fluid pressure signal is transmitted. Fluid control for sequentially opening a delay valve and an OR element having the other input port, which are switched from a closed state to an open state for communicating the upstream flow path and the downstream flow path, and opening the fluid pressure operation valve. A first output unit including an open control flow path for transmitting a signal to the fluid pressure operated valve, and a closed control flow path for transmitting a fluid control signal for closing the fluid pressure operated valve to the fluid pressure operated valve; An output flow path provided with a fluid pressure control valve that is opened and closed by a fluid control signal, and a closed state that closes an upstream flow path and opens a downstream flow path after a predetermined time when a fluid pressure signal is transmitted. Open state that connects the upstream flow path and the downstream flow path An open control flow path for transmitting a fluid control signal for opening the fluid pressure operated valve to the fluid pressure operated valve and a fluid control signal for closing the fluid pressure operated valve being ORed. A plurality of second output units each comprising a closed control channel for transmitting the fluid pressure from the element outlet to the hydraulic pressure control valve, and a branch from the output flow channel downstream of the hydraulic pressure control valve of the output unit between the output units. A fluid pressure signal passage for transmitting a part of the fluid in the output passage as the above-mentioned fluid pressure signal to the delay valve of the next output unit, and between the first output unit and the next second output unit. In the above, the closed control flow path of the first output unit is branched from the output flow path of the second output unit downstream of the fluid pressure operated valve, and the output flow downstream of the fluid pressure operated valve is provided between the remaining output units. From the road The O output unit before being Toki
A closed control flow path leading to the R element inlet is provided, and the flow path from the fluid source is selectively connected to one of the first supply path and the second supply path and the other supply path that is not selected is opened. A switching means for setting the first supply path to communicate with the open control flow path upstream of the delay valve and the output flow path upstream of the fluid pressure control valve of each output unit; A pulse generation circuit having a reset channel for communicating with another inlet of the OR element of the unit. 2. The delay valve has a structure in which a throttle valve, an accumulator, and a three-port two-way spring return type fluid pressure operated valve are connected in series, and a fluid pressure signal is transmitted from a connection port on the throttle valve side. When the pressure in the accumulator rises after a predetermined time, the first pressure of the fluid pressure operated valve is increased.
2. The apparatus according to claim 1, wherein the port is closed so that the port is closed and the second port is opened via the third port. Pulse generation circuit. 3. A fluid pressure control valve which is switched between an open state in which the upstream flow path and the downstream flow path are communicated and a closed state in which the upstream flow path is closed and the downstream flow path is opened by a fluid control signal. An output flow path provided with a fluid pressure signal is transmitted, and after a predetermined time, the upstream flow path is closed and the downstream flow path is opened from a closed state in which the upstream side and the downstream side are communicated with each other. An opening control flow path for sequentially transmitting a fluid control signal for opening the fluid pressure operated valve to the fluid pressure operated valve, the delay valve being switched and an OR element having the other input port being sequentially provided; A first output unit comprising a closed control flow path for transmitting a fluid control signal for closing the valve to the hydraulic pressure control valve; and an open state for communicating the upstream flow path and the downstream flow path by the fluid control signal. And close the upstream flow path and open the downstream flow path An output flow path provided with a fluid pressure operation valve that is switched to a closed state, and an upstream flow path is closed and a downstream flow path is opened after a predetermined time when a fluid pressure signal is transmitted. An open control flow path for transmitting a fluid control signal for opening the fluid pressure operated valve to the fluid pressure operated valve, provided with a delay valve that is switched to an open state communicating between the fluid pressure operated valve and the fluid pressure operated valve; A plurality of second output units each comprising a closed control flow path for transmitting a fluid control signal for closing the valve from the outlet of the OR element to the fluid pressure control valve; and an output unit between the output units. A fluid pressure signal flow path branched from an output flow path downstream of the fluid pressure operation valve and transmitting a part of the fluid in the output flow path as the above-described fluid pressure signal to the delay valve of the next output unit; Output unit and next Between the output unit and the output unit, the closed control flow path of the first output unit is branched from the output flow path of the second output unit downstream of the fluid pressure operation valve, and the fluid pressure operation is performed between the remaining output units. Said O of the previous output unit branched from the output flow path downstream of the valve
A closed control flow path leading to the R element inlet is provided, and a flow path from the fluid source is selectively connected to one of the first supply path and the second supply path and the other supply path that is not selected is opened. A switching means for setting the first supply path to communicate with the open control flow path upstream of the delay valve and the output flow path upstream of the fluid pressure control valve of each output unit; A pulse generation circuit having a reset channel for communicating with another inlet of the OR element of the unit. 4. The delay valve has a structure in which a throttle valve, an accumulator, and a three-port two-way spring return type fluid pressure operated valve are connected in series, and a fluid pressure signal is transmitted from a connection port on the throttle valve side. When the pressure in the accumulator rises after a predetermined time, the first pressure of the fluid pressure operated valve is increased.
4. The apparatus according to claim 3, wherein the port is closed so that the port is closed and the second port is opened via the third port. Pulse generation circuit.