JPH0637237B2 - Fixed amount liquid supply device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed amount liquid supply device which operates to stop the liquid supply at a preset amount.

[Prior Art] Conventionally, an apparatus described in Japanese Patent Application Laid-Open No. 56-84298 is known as this type of apparatus. That is, a control valve that throttles the liquid supply passage to decelerate and close the liquid supply is provided, and the supercharged liquid amount due to the response delay related to the liquid supply passage closing operation in this control valve is calculated as the liquid supply flow velocity, the valve opening, and A predictive calculation is performed according to the response speed of the control valve, and when the amount of liquid supply reaches the preset value of the supercharged liquid amount, a closing operation is started to prevent excessive supply of liquid. Note that the valve opening here refers to the relative opening with respect to the liquid supply flow velocity in which the liquid supply flow velocity is adjusted to a set value, and the response speed of the control valve is A constant that is determined according to (performance) is given.

[Problems to be Solved by the Invention] By the way, in this conventional device, since the response speed of the control valve, which is a factor in the prediction calculation of the supercharging oil amount, is given as a constant corresponding to the control valve used, the operating speed of the control valve If the value fluctuates, there is a drawback that an accurate metered liquid cannot be supplied. That is, even with the same control valve, the operating speed fluctuates due to temperature and changes over time, and even with the same type of valve, the operating speed may differ due to instrumental errors. Will be stopped, and if it is late, it will be supercharged. In particular, such inconvenience is caused by, for example, the actual exploitation Sho 57-1.
This is remarkable in the mobile liquid supply device as seen in Japanese Patent No. 74400. That is, it is because the control valve is placed on a bed of an automobile or the like and is constantly subjected to vibrations as it moves, so that the control valve is apt to change with time, and when it is used outdoors, environmental changes such as temperature are remarkable.

The fluctuation of the operating speed of the control valve as described above can be eliminated to some extent by increasing the accuracy of the control valve, but on the other hand, the use of an accurate and expensive control valve is unavoidable.

[Means for Solving Problems] The present invention includes means for presetting the amount of liquid to be supplied, means for counting the flow pulse from a flow meter provided in the liquid supply path, and detecting the amount of liquid supply. Means for detecting the liquid supply flow velocity in the liquid supply passage by monitoring the flow rate pulse, and valve drive means for gradually displacing the valve body from fully open to fully closed are provided, and the liquid supply passage is throttled to decelerate and close the liquid flow. A control valve for performing, a detected body that is displaced in conjunction with the valve driving means, and a means for detecting that the detected body is displaced to a predetermined position are provided, and the control valve is opened to a predetermined opening before closing. Means to detect that there is,
Means for detecting the operating speed of the control valve by counting the time during which the control valve is throttled from the fully open state to the predetermined opening, and the timing at which the control valve should be throttled from the predetermined opening toward the liquid supply stop. Means for setting according to the liquid supply flow velocity detected by each of the detection means and the operating speed of the control valve, and when the liquid supply amount reaches a predetermined amount before the preset value, the control valve is once throttled to the predetermined opening degree After the operation, the control valve is controlled to be throttled at the timing set by the setting means so as to stop the liquid supply, and the problem is solved.

[Operation] As a result, when the liquid supply amount reaches a predetermined amount before the preset value, the control valve is throttled to a predetermined opening before closing and the liquid supply is decelerated, and the operating speed of the control valve at this deceleration is reduced. Detect and
Since the timing for closing the control valve is set based on the detected operation speed and the liquid supply flow velocity each time, accurate quantitative liquid supply can be performed even if the operation speed of the control valve changes. In addition,
The target predetermined opening during deceleration operation is different from the relative opening with respect to the flow velocity as in the conventional device described above, and represents a constant valve opening position determined by the object to be detected that is interlocked with the valve driving means. The degree of control does not change even if the liquid flow rate changes, so the control valve closing operation always starts from a fixed valve opening position, and if the control valve operating speed is known, the accurate time to valve closing can be predicted. The timing of the closing operation can be set without error.

[Examples] Specific examples will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present invention. 1
Is a tank for storing the liquid to be fed, 2 is a liquid feed pump, 3
Is a flow meter, 4 is a control valve for adjusting and closing the liquid flow in the liquid supply passage 5, 6 is a flexible liquid supply hose made of rubber or the like, 7 is a liquid supply nozzle provided at the tip of the hose 6, A flow path is formed by these respective parts. The liquid supply nozzle 7 is composed of a so-called auto nozzle that automatically shuts off the liquid supply when it detects that the liquid surface in the container receiving the liquid supply has reached the tip position of the nozzle 7.

Reference numeral 8 is a drive circuit for the pump 2, 9 is a pulse transmission device that outputs a number of pulse signals proportional to the flow rate measured by the flow meter 3, and 10 is a drive circuit for the control valve 4. 11 is a liquid supply amount display, 12 is an operation board, and the operation board 12 has a mode switch 13 for selecting "normal" or "preset", a preset key 14 for inputting a preset value, and a start and start of liquid supply. An operation switch 15 for inputting stop is provided.

The “normal” mode of the mode switch 13 is to stop the liquid supply by manually closing the nozzle 7 or
The "preset" mode, which is performed by the automatic shutoff operation, is a mode in which the liquid supply is automatically stopped by the preset amount input by the preset key 14.

Reference numeral 16 denotes a control unit of the liquid supply device, which has a built-in microcomputer and performs sequence control according to a program.

This embodiment shows an apparatus having the above-mentioned configuration and suitable for delivery of kerosene or the like, which is placed on a truck bed or the like. That is, the liquid supply hose 6 is extended as needed for delivery, or the control valve 4 is placed because it is placed on the loading platform and constantly vibrated.
This is one of the effects of utilizing the present invention, since it is easy for the respective devices such as to change with time.

FIG. 2 shows the configuration of the control valve 4, 20 is a motor equipped with a speed reducer 21, 22 is a ball valve connected to the liquid supply path 5,
23 is a gear for rotating the shaft 24 of the ball valve 22,
Driving the motor 20 in the forward and reverse directions opens and closes the ball valve 22 to adjust and close the flow rate of the liquid supply passage 5.

Reference numeral 25 is an encode disk integrally attached to the gear 23, and 26-1.2 are first and second photocouplers for detecting a signal hole 27 formed in the peripheral portion of the encode disk 25, which are ball valves. It is used to detect the valve opening of 22.
That is, as shown in FIG. 3 which is a plan view of relevant parts, setting is made so that O1 and O2 of the signal hole 27 are detected by the first and second photocouplers 26-1.2, respectively, at the fully opened position of the ball valve 22. For the time being (at the position shown in FIG. 3), as the valve 22 is closed, the first photocoupler 26-1.2 is used for A / B.
The signal holes are sequentially detected and the S signal hole is detected when the valve is fully opened. In the control unit 16, the detection signals are simultaneously input from both the first and second photocouplers 26-1 and 26-2. It is judged that the valve 22 is in the fully open state, and thereafter the first
The detection signal from the photo coupler 26-1 is counted and the opening degree of the valve 22 is detected in the order of throttle position A, throttle position B, full open S. In this embodiment, the flow rate is set to about 60% at the throttle position A and about 15% at the throttle position B with respect to the normal flow rate when the valve 22 is fully opened.

FIG. 4 is a block diagram for explaining the main part of the control system of the embodiment. When the operation switch 15 on the operation board 12 is pressed, the control valve 4 is opened, and further, when the liquid supply nozzle 7 is opened to start liquid supply, the pulse transmission device 9 responds to the liquid supply flow rate. Output a pulse signal. The liquid supply amount detector 30 counts the pulse signal to detect the liquid supply amount Q, and the flow velocity detector 31 detects the flow velocity FV in the liquid supply passage 5 from the interval at which the pulse signal is input. The preset value setting unit 32 receives the input from the preset key 14 of the operation board 12 to set the preset amount P, and the remaining liquid supply amount detecting unit 33 sets the preset amount P and the liquid supply amount Q given by the liquid supply amount detecting unit 30. And the remaining amount R until the liquid supply reaches the preset value P is calculated.

The throttle operation speed detector 34 detects a closing speed MV of the control valve 4 in response to a signal from a photo coupler 26-1.2 which is a valve opening detecting means, and detects the closing position A from the fully open position of the ball valve 22. It is calculated based on the time required to narrow down. The timing setting unit 35 uses the throttle operation speed MV given by the detection unit 34 and the flow velocity FV given by the flow velocity detection unit 31 as parameters to set timings T ₁ and T _{2 at} which the control valve 4 is throttled to stop the liquid supply. There is a table to be obtained, and the timings T ₁ and T ₂ are given by the liquid supply front amount (remaining amount) with respect to the preset value. The timing T ₁ is the diaphragm position A
To the diaphragm position B, the timing T ₂ represents the diaphragm operation timing from the diaphragm position B to the fully closed position S. The table included in the timing setting unit 35 is the fifth table for each of the timings T ₁ and T ₂ .
The table shows the characteristics shown in the figure. If the flow velocity FV increases, the timing amounts T ₁ and T ₂ increase, and the throttle operating speed MV increases.
If T is faster, the timing amounts T ₁ and T ₂ will decrease.

In the valve control unit 36, the timing amounts T ₁ and T ₂ given by the timing setting unit 35 are compared with the remaining amount R given by the liquid supply remaining amount detecting unit 33, and if they match, the control valve 4 is sent to the control valve 4 via the drive circuit 10. A predetermined diaphragm operation is given.

FIG. 5 is a flow chart showing the main part of the program in the control section 16, and the operation of the embodiment will be described below with reference to this figure. It should be noted that this flow shows the operation when the mode switch 13 is set to the "preset" mode.

The operation switch 15 is pressed on the operation board 12 to start the operation. First, the preset value input immediately before the operation switch 15 is pressed is assigned to the register P (1), and then the control valve 4 is opened to the fully open position. Then, the pump 2 is driven and the display on the display 11 is set to 0 (2). In this state, the hand valve is opened in the nozzle 7 to start liquid supply. When the liquid supply is started, a pulse is input from the pulse transmission device 9 every time there is a unit amount outflow, an interrupt is input to the CPU of the control unit 16 to count the flow rate, and the counted flow rate Q is displayed on the display unit 11. Display (3). Further, the period of the pulse signal is obtained and is given to the register FV as flow velocity data.
(Four).

In this way, when the liquid supply is executed and the difference between the liquid supply amount Q and the preset value P reaches a constant amount C (about 5 in this example) (5), the control valve 4 is driven to the throttle position A (photo coupler 26). −
The diaphragm is operated (1) until it detects the signal hole 27-A (6).
Further, the time required for this diaphragm operation is counted and given to the register MV as operation speed data (7). Based on the thus obtained throttle speed MV and the flow velocity FV obtained in step (4), the timing amount T ₁ · T is obtained from the timing setting table.
Set ₂ (8).

After this, it becomes the mode to display the flow velocity Q on the display 11 again.
(9) When the difference between the liquid supply amount Q and the preset value P reaches the set timing amount T ₁ (10), the control valve 4 is operated to perform the throttle operation to the throttle position B (11). When the difference between Q and P reaches the timing amount T ₂ (13), the control valve 4 is throttled and closed (14), the final liquid supply amount Q is displayed on the display 11, and the pump 2 is stopped. (15) Finish the liquid supply.

As described above, in this embodiment, when the liquid supply is started, the liquid supply flow velocity (maximum flow velocity) is measured with the control valve 4 fully opened, and when the liquid supply reaches a predetermined amount before the preset value, a predetermined value is determined. The flow rate is reduced by throttling to the position (throttle position A), the throttling operation speed at this time is measured, and the start timing of the control valve throttling operation is set based on the flow velocity and the throttling operation speed thus measured to supply the liquid. It has stopped at the preset value.

EFFECTS OF THE INVENTION The present invention is configured as described above, and detects the operating speed of the control valve for each supply of liquid, and throttles the control valve at a timing according to the speed to stop the supply of liquid. Even if the operating speed of the control valve fluctuates, accurate quantitative liquid supply can be performed.

Further, the closing operation of the control valve is always performed from a predetermined opening given by the object to be detected, and the momentum until the valve closing of the control valve is always constant.Therefore, the setting means can easily set the closing operation timing without error. , It is possible to accurately stop the liquid supply with the preset value.

Moreover, it is possible to use a relatively inexpensive control valve because it is possible to check the operation speed for each liquid supply and compensate for the operation variation of the control valve without using a highly accurate and expensive control valve with little operation variation. .

[Brief description of drawings]

FIG. 1 is an explanatory view of the configuration of one embodiment of the present invention. FIG. 2 is an explanatory view of the configuration of the essential parts of the same embodiment. FIG. 3 is an explanatory view showing the plane of the essential parts of FIG. Fig. 5 is a block diagram for explaining the main part of the system. Fig. 5 is an explanatory diagram of the characteristics of the data used in the embodiment. Fig. 6 is a flow chart for the main part of the program of the embodiment. Reference numeral 9 is a pulse transmission device, 12 is an operation board equipped with preset means, 16 is a control unit, 20 is a motor which is valve drive means, 25 is an encode disk which is an object to be detected, 26 is a photocoupler which is opening degree detection means, 30 is a liquid supply amount detection unit, 31 is a flow velocity detection unit, 32 is a preset value setting unit, 33 is a liquid supply remaining amount detection unit, 34 is an operating speed detection unit, 35 is a timing setting unit, and 36 is a valve control as a control means. Department.

Claims (1)

[Claims] 1. A means for presetting an amount to be supplied, a means for detecting a supply amount by counting flow rate pulses from a flow meter provided in a supply path, and a supply solution by monitoring the flow rate pulse. A means for detecting the liquid supply flow velocity in the passage, a valve drive means for gradually displacing the valve body from fully open to fully closed, a control valve for decelerating and closing the liquid flow by narrowing the liquid supply passage, and the valve drive means And a means for detecting that the detected body is displaced to a predetermined position, and detecting that the control valve is at a predetermined opening before closing the control valve; A means for counting the time during which the valve is throttled from the fully opened state to the predetermined opening to detect the operating speed of the control valve, and the timing for throttle operation of the control valve from the predetermined opening to stop the liquid supply. Liquid supply flow velocity detected by each detection means and control valve A means for setting according to the operating speed, and once the liquid supply amount reaches a predetermined amount before the preset value, the control valve is temporarily throttled to the predetermined opening degree, and after this throttle operation, the timing of the throttle operation is set by the setting means. Then, a fixed amount liquid supply device comprising: means for controlling to stop the liquid supply by squeezing the control valve at the set timing.