JPH0715318B2 - Method and apparatus for controlling flow rate of liquefied gas flow apparatus - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for controlling a flow-down amount of a flow-down device for adding a liquefied gas to a can of cans.

Conventional technology Conventionally, in order to compensate for the lack of strength of a can made of a thin material or to prevent the deterioration of the contents of the can, just before the can lid is closed, liquefied inert gas such as liquid nitrogen (hereinafter simply liquefied). It is performed that a certain amount of gas) is flowed into the can and sealed.

The liquefied gas flow-down device used for these is to continuously or intermittently flow down the liquefied gas from a flow-down nozzle provided at the bottom of a liquefied gas storage tank that is pressurized or communicated with the atmosphere,
A fixed amount is added to the cans that are continuously conveyed by a conveyor.

In the flow-down device for continuously flowing down, the amount of the flow-down liquid contained in the can is proportional to the time for passing through the nozzle portion. That is, if the same amount is to be enclosed in the can, the amount of flow down per unit time must be proportional to the line speed. Conventionally,
In such a continuous flow-down device, the flow rate is changed according to the line speed, for example, two sets of nozzles are provided as shown in JP-A-58-184396, and one set at low speed,
It is known that two sets of nozzles flow down at high speed. In the case of these flow-down devices, the flow-down amount is determined by the hole diameter and the number of nozzles, and is supplemented by the liquid level height. However, the adjustment of the amount of flow depending on the liquid surface height is effective in the case of the one-nozzle type, but the two-nozzle type also affects the other nozzle, so that the amount of flow-down of only one nozzle cannot be adjusted. There is inconvenience. Therefore, the nozzle must be replaced eventually. Nozzle replacement is
It must be done after all the liquid in the tank has been discharged, and since it is extremely low temperature, when the outside air enters, the water vapor freezes in the device, which is a very difficult task in terms of time and technology. is there.

Further, the present applicant has previously controlled the internal pressure of the pressurization type storage tank, and by controlling the opening degree of the needle valve of the dropping nozzle with a pulse motor, the flow rate of the liquefied gas is controlled. A dropping device was proposed (JP-A-59-34100 and JP-A-59-106799).

Problems to be Solved by the Invention Recently, high-speed seams have been introduced along with the speeding up of canned food production lines. High-speed seamer is high speed, low speed 2
Most of the models can be operated at speed, but at the start, they start operating at low speed and shift to high speed when the equipment reaches a steady state. There are two speed changing methods: one in which the speed ratio is changed in steps of 1: 2 by the pole change of the motor, and one in which the speed is smoothly changed by the inverter. At the time of gear shifting by the pole change, it is necessary to turn off the power to the motor for a moment, and the speed suddenly drops as shown in FIG. 6C. Although the speed change by the inverter is smooth as shown in Fig. 7, the speed can be set freely at high speed and low speed, and the speed ratio is not always 1: 2. The settings are changed during operation due to changes and operating conditions.

In such a case, in the above-mentioned conventional device, especially in the shift sections A, C, E, F, H, J, and L shown in FIGS. 6 and 7, the downflow amount is continuously changed corresponding to the speed. I can't. Therefore, there is a problem in that an appropriate amount of liquefied gas cannot be filled and a can with defective internal pressure is generated. Further, in the case of the two sets of nozzles, the nozzles themselves must be replaced when the speed K section shown in FIG. 7 or the can type is changed, which results in a waste of time. .

Further, what is finely adjusted by controlling the tank internal pressure is that the flow velocity is increased by pressurizing the inside of the tank, scattering when dropping in the can increases, and variations in the internal pressure of the can easily occur, There is a problem that the device is complicated to control the internal pressure of the can.

Further, conventionally, the intermittent dropping method has been adopted in the low speed line in consideration of the yield, and the continuous dropping method has been adopted in the high speed line. Therefore, conventionally, it was necessary to prepare a liquefaction addition device separately for low speed and high speed.

The present invention was devised in view of the above-mentioned circumstances, in which the line speed is constantly monitored in an open tank, the flow rate of liquefied gas is continuously adjusted by following the change in the speed, and even during shifting. Provide a speed tracking control method and device for a liquefied gas flow-down device that can always flow an appropriate amount of liquefied gas without replacing the nozzle, and can appropriately select a flow-down system or an intermittent system without modifying the device. The purpose is to do.

Means for Solving Problems In a liquefied gas flow-down device using a needle valve, the valve opening and the flow rate have a relationship as shown in FIG. The flow rate into the can is proportional to the line speed, but the actual flow rate required differs for each can type. Therefore, as shown in Fig. 5 (b), the rate of change of the flow rate with respect to the speed is also the can type. Each must be different. Further, the liquefied gas evaporates and decreases between the time when the liquefied gas flows down and the time when the liquefied gas is wound. The amount of evaporation depends on the line speed,
Evaporation increases in the low speed range. Therefore, it is necessary to add the amount of evaporation during that period to the amount actually enclosed in the can, that is, the amount of evaporation d as shown in FIG. Thereby, the absolute value of the required flow rate shown in the c-line of FIG. 5C is obtained. In addition, in FIG. 5C, the a-line diagram is a diagram in which the c-line diagram is translated in the vertical axis direction so as to pass through the origin. The parallel movement amount is represented by e as an offset value.

Thus, the c diagram in FIG. 5C can be expressed by the equation y = px + e. Here, y is the required flow rate of the liquefied gas, p is the rate of change of the flow rate of the liquefied gas with respect to the known line speed depending on the conditions of addition of the flowable material including at least can species, x is the line speed, and e is the offset. Means each quantity. The offset amount e is an added down flow amount that is known irrespective of the line speed and is known according to the conditions for adding the down flowed product including at least the can type.

Therefore, by using the above relational expression, a gain setter for selecting and setting a necessary p corresponding to at least the type of falling waste product addition condition and a corresponding condition for adding the falling waste product at least can type are set. By providing a speed opening conversion setting device consisting of an offset setting device for selecting and setting the required e, the appropriate required flow rate can be set according to the speed for any can type and feed pitch seamer. . By converting the required flow rate set in this way into the valve opening according to FIG. 5 (a), it is possible to cope with any feed pitch seamer or can type. The present invention is
It is based on this principle.

A method of controlling a liquefied gas flow-down device according to a first aspect of the present invention is a method of controlling a flow-down amount of liquefied gas from a storage tank by adjusting an opening amount of a needle valve provided in a lower portion of the storage tank. The upper end of is connected to the armature of the valve opening / closing solenoid,
By operating the valve opening / closing solenoid, the needle valve is opened / closed, and an opening adjustment stopper driven up and down by a pulse motor is arranged during the stroke of the armature and the valve is opened by adjusting the stopper up and down. The rotation of the output shaft of the pulse motor is transmitted to the potentiometer and the movement amount of the stopper is converted into the rotation angle of the potentiometer so that the opening of the needle valve is always detected by the potentiometer. The following formula y = px + e (where y is the required flow rate of the liquefied gas and p is the known line speed depending on the conditions of the underflow material including at least the can type) Change rate of liquefied gas flow rate, x is line speed, e is line speed It means the added flow-down amount that is known regardless of the degree and that is known according to the added condition of the falling material containing at least the can type.) Velocity / flow rate conversion consisting of a gain setter that selects and sets the required p correspondingly, and an offset setter that selects and sets the required e corresponding to at least the conditions of addition of the falling material including can types The line speed / flow rate conversion data for controlling the opening of the needle valve with respect to the line speed is preset by the setter according to the conditions of addition of the falling material including at least the can type, and the set line speed / flow rate conversion data is set. The required flow rate corresponding to the line speed detected by the speed detection means is obtained based on the calculated flow rate, the required opening degree of the needle valve is calculated from the required flow rate, and the calculated value and the potentiometer are used. Follow the change in line speed by comparing the measured opening amount of the needle valve and outputting the comparison value to the pulse converter to rotate the pulse motor to adjust the opening amount of the needle valve. It is characterized in that the flow rate of the liquefied gas can be controlled continuously.

A flow rate control method for a flow-down device according to a second aspect of the present invention is based on the first aspect, in which a reference line speed serving as a reference for switching to intermittent dropping or continuous flow of a liquefied gas is preset and a line detected by the speed detecting means. When the speed is lower than the reference line speed, a control means for automatically switching to intermittent drip is added. That is, when the speed detected by the speed detecting means is high, the method of the first invention is carried out, and when the speed is low, the dropping timing and the valve opening time are controlled according to the speed fluctuation in the low speed range to control the needle. The valve was opened and closed intermittently.

A third aspect of the present invention is an apparatus for performing the control method according to the above-mentioned aspect of the present invention, which is a method for controlling the flow rate of liquefied gas from the storage tank by adjusting the opening degree of a needle valve provided at the bottom of the storage tank. An upper end of a needle of the needle valve is connected to an armature of a valve opening / closing solenoid, the needle valve is opened / closed by operating the valve opening / closing solenoid, and is vertically driven by a pulse motor during a stroke of the armature. A valve opening is adjusted by arranging an opening adjustment stopper and adjusting the stopper up and down, and at the same time, the rotation of the output shaft of the pulse motor is transmitted to a potentiometer, and the movement amount of the stopper is adjusted to the rotation angle of the potentiometer. By converting it, the valve opening can be adjusted with a potentiometer. The following equation y = px + e (where y is the required flow rate of the liquefied gas, and p is known according to the conditions of addition of the flowed bottoms including at least the can type) The rate of change of the liquefied gas flow rate with respect to the line speed, x is the line speed, e is the line speed, and the known additional flow rate is determined according to the conditions of addition of the falling material including at least the can type. It is applicable to the gain setter that selects and sets the necessary p in accordance with the conditions for adding the spilled substance that contains at least the can type, and the condition for adding the spilled substance that contains at least the can type. The speed / flow rate conversion setter consisting of an offset setter that selects and sets the required e. The line speed / flow rate conversion data that controls the opening of the valve is preset, and the reference line speed that serves as a reference for switching to intermittent dropping or continuous flow of the liquefied gas is preset, and the line detected by the speed detecting means. When the speed is higher than the reference line speed, the required flow rate corresponding to the line speed detected by the speed detecting means is obtained based on the set line speed / flow rate conversion data, and the needle valve of the needle valve is calculated from the required flow rate. The required opening amount is calculated, the calculated value is compared with the opening amount of the needle valve measured by the potentiometer, and the comparison value is output to the pulse converter to rotate the pulse motor to open the needle valve. By adjusting the flow rate, the flow rate can be continuously controlled by following the change in the line speed, and the line speed can be adjusted to the reference line. When the speed is slower than the speed, the needle valve is intermittently opened by intermittently driving the solenoid by controlling the drip timing and the valve opening time in accordance with the speed fluctuation in the low speed range to intermittently discharge the liquefied gas. It is characterized in that it is added to the.

The line speed is detected by the speed detecting means to read the speed, and the required opening of the needle valve is calculated based on the speed. On the other hand, the current opening is detected by the potentiometer 10, the calculated value and the measured value are compared, and if the opening is insufficient or the opening is excessive, a signal is sent to the pulse motor,
Rotate the pulse motor by the required amount. Thereby,
The opening amount of the needle valve is always controlled by following the line speed.

Further, the required opening of the needle valve with respect to the line speed varies depending on the conditions of addition of the falling material such as the can type, but in the present invention, the speed / flow rate conversion setter is composed of a gain setter and an offset setter, and Set the rate of change of the flow rate of liquefied gas with respect to the line speed according to the conditions of addition of the flowed material such as can type, and the flow rate of the flow of liquefied gas obtained by the gain setting device with the offset setting device. By setting the flow-down amount to be added according to the above as an offset amount, any can type, any filling condition or feed pitch seamer can be dealt with, and the liquefied gas can always be properly filled into the can.

The opening / closing of the needle valve is performed by a valve opening / closing solenoid, and the opening is adjusted by vertically moving an opening adjustment stopper with a pulse motor. Therefore,
Since the opening and closing of the valve and the adjustment of the opening amount can be performed by different means, it is possible to open the valve at a stretch to the position where the opening adjustment stopper is located by driving the drive required solenoid, and at that position Since the opening amount is adjusted by the pulse motor, the responsiveness is very fast, and the opening amount of the valve can be adjusted by following the speed from the initial operation. Moreover, since the position of the opening adjustment stopper is constantly detected by the splash potentiometer and compared with the line speed, the speed following control can be performed accurately (finely).

Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a valve unit of a liquefied gas flow-down device for carrying out the control method of the present invention.

In the figure, 1 is a valve seat provided at the bottom opening of a liquefied gas storage tank (not shown), and the opening of the valve hole 2 of the valve seat is adjusted by changing the stroke amount of the needle 3, The flow rate of liquefied gas from the liquefied gas storage tank is adjusted.

The needle 3 has its upper end fixed to the armature 5 of the valve opening / closing solenoid 4 and is attracted and raised by the action of the solenoid 4 to open the valve hole 2.

An opening adjustment screw 6 is arranged so as to be positioned during the stroke of the armature 5, and acts as a stopper that regulates the ascending stroke of the armature 5. The opening adjusting screw 6 moves up and down by the rotation of the valve opening adjusting pulse motor 7, and adjusts the stroke of the armature 5 (needle 3). That is, the rotation of the pulse motor increases or decreases the A dimension in the figure, and the valve opening is regulated by the A dimension.

Reference numeral 8 denotes a gear fixed to the shaft of the pulse motor 7, and a gear 11 of a valve opening confirmation potentiometer 10 meshes with the gear 8. Therefore, the rotation of the pulse motor 7 is transmitted to the potentiometer via the gears 8 and 11. That is, the increase or decrease of the A dimension is converted into the rotation angle of the potentiometer 10, and the current A dimension is output from the potentiometer 10 as a voltage. Therefore, the present opening can be read by checking this voltage.

Next, a flow-down control method of the liquefied gas flow-down device will be described with reference to FIG.

This control method uses a microcomputer (hereinafter, CPU) to change the stroke amount of the needle according to the line speed and the can type.
It is controlled by

First, the speed is detected by mounting the cam 15 on the shaft of a seamer (not shown) that makes one rotation for each can winding and counting it by the sensor 16, and the signal is sent by the speed converter 17. Converted to speed data and input to CPU. On the other hand, the current opening data is input from the potentiometer 10. Further, by setting the can type and the offset amount in the speed / flow rate conversion setter 20 including the gain setter 21 and the offset setter 22, these set values are set to CP.
Input to U. For speed / flow rate conversion, as described above, the data for speed / flow rate conversion is input in advance, and by selecting it with the gain setting device and setting the offset amount with the offset setting device, evaporation to speed It is processed by the CPU by obtaining the required flow rate considering the amount and further converting the required flow rate into the opening amount of the needle valve. Therefore, by combining the gain setting device 21 and the offset setting device 22, it is possible to cope with any field pitch seamer depending on the type of can.

The CPU calculates the opening amount of the needle valve corresponding to the current speed according to the support of the speed / flow rate conversion setter 20 by reading the speed, and the calculated value and the actually measured value measured by the potentiometer 10. To compare. The opening data of the needle valve from the potentiometer is displayed on the opening indicator 24.

If the measured value is different from the calculated value and the opening is insufficient,
The pulse increase signal is converted into a predetermined number of pulses by the pulse converter 25 and the pulse motor 7 is rotated by a predetermined amount to expand the A dimension. On the contrary, when the opening is excessive, the opening decrease signal is applied to reduce the dimension A.

As described above, when the dimension A is set, the seamer is in operation, and the presence or absence of the can on the conveyor is detected by the can detection sensor 26, and the can is present, the solenoid 4 operates,
The armature 5 is sucked by the size A. As a result, the needle 3 rises, the valve is opened by a predetermined amount, and the liquefied gas flows down into the can on the conveyor. Further, when the seamer is stopped or there is no can on the conveyor, the solenoid 4 is not activated and the valve is closed.

By repeating the above routine, the line speed is constantly monitored by the speed detecting means (speed detecting cam 15 and sensor 16), and the flow rate is continuously controlled following the speed. FIG. 3 shows the above routine. In this case, the valve is always open and the liquefied gas is continuously flowed down as long as the seamer is operating and the can is conveyed on the conveyor.

FIG. 4 is a flow chart showing the routine of the embodiment of the second invention. In this case, the continuous flow-down method is used in the high speed range, and the intermittent dropping method is used in consideration of the yield in the low speed range where the valve opening / closing frequency is low and a predetermined amount can be injected without pressurization.

That is, a line speed discrimination circuit for discriminating a reference line speed for switching the liquefied gas to continuous flow or intermittent dropping is added,
If the line speed is higher than the preset speed, the continuous flow-down routine is formed as in the above embodiment, and if the line speed is low, the intermittent dropping routine is formed.

In the intermittent drip, the valve opening is fixed, and the drip timing and the valve opening time can be controlled with respect to the speed fluctuation in the low speed range. The drip timing is for drip at an ideal position in the can, and the timing differs depending on the speed. In this embodiment, the dropping timing corresponding to the speed is input in advance and set, and the CPU calculates by detecting the speed, and the dropping timing is automatically set. Similarly, the valve release time is also calculated by the CPU by detecting the speed, and the valve release time is automatically set.

Therefore, in the case of the intermittent dropping routine, first, the valve opening time is calculated based on the read speed, and then the valve opening timing is calculated. And Cima is driving,
When there is a can signal, the needle valve opens and closes at a predetermined timing for a predetermined time according to the set value.

Therefore, in the case of the present embodiment, continuous downflow and intermittent dropping can be performed with one device.

Although each of the above examples has been described only in the case where the liquefied gas is added to the can of the can, the present invention is not necessarily limited to this case, and the predetermined amount of the liquid in the container continuously conveyed on the conveyor. It goes without saying that it can be applied to the case of filling with.

EFFECTS OF THE INVENTION As described above, the present invention is the first practical application of the method of continuously controlling the amount of downflow by following the speed, which has been conventionally regarded as difficult, and has the following remarkable effects. It is a thing.

That is, since the present invention constantly monitors the line speed and continuously adjusts the liquefied gas flow rate by following the change in the speed, it is possible to always flow an appropriate amount of liquefied gas without changing the nozzle even during gear shifting. it can. In addition, the speed / flow rate conversion setter is composed of a gain setter and an offset setter, and the flow rate conversion data for the line speed is set by the gain setter according to the falling material addition condition, and the offset setter for the line speed. Since the evaporation amount of the liquefied gas can be set as the offset amount, it is possible to deal with any type of can, filling conditions or seamers having different feed pitches, and the liquefied gas can always be properly filled into the can. Then, the valve opening is finely adjusted according to the change of the line speed, and the optimum amount is always flowed down. Therefore, it is not necessary to control the internal pressure of the tank to perform the fine adjustment as in the conventional case. In particular, since the opening and closing of the valve and the adjustment of the opening amount are performed by different means, the responsiveness is very fast and the opening amount of the valve can be adjusted by following the speed from the initial operation. Moreover, since the position of the opening adjustment stopper is always detected by the potentiometer and compared with the line speed, speed follow-up control can be performed accurately.

Moreover, since the continuous flow-down method and the intermittent dropping method can be selectively performed by one device, it is not necessary to separately provide a dedicated device as in the conventional case. The present invention can be applied to any line and can effectively use liquefied gas.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a schematic side view of a valve unit, FIG. 2 is an input / output view of a control device, FIG. 3 is a flow chart of the first invention, and FIG. FIG. 5 is a flow chart of the second invention, FIG. 5 is a graph showing the principle of speed-opening conversion, (a) is the relationship between the opening and the flow rate, (b) is the principle of the gain setting device, and (c) is the offset setting. FIG. 6 is a graph showing the operating state of the pole change seamer, and FIG. 7 is a graph showing the operating state of the inverter seamer. 1: valve seat, 2: valve hole, 3: needle, 4: valve opening / closing solenoid, 5: armature, 6: opening adjustment screw, 7: pulse motor, 8, 11: gear, 10: potentiometer, 15:
Speed detection cam, 16: sensor, 20: speed / flow rate conversion setter

Claims (3)

[Claims] 1. A method of controlling a flow rate of liquefied gas from a storage tank by adjusting an opening amount of a needle valve provided at a lower portion of the storage tank, wherein an upper end of a needle of the needle valve is a valve opening / closing solenoid. The needle valve is connected to the armature and the needle valve is opened / closed by the operation of the valve opening / closing solenoid. An opening adjustment stopper that is vertically driven by a pulse motor is arranged during the stroke of the armature to adjust the stopper up and down. While adjusting the valve opening by doing so, by transmitting the rotation of the output shaft of the pulse motor to the potentiometer, by converting the movement amount of the stopper into the rotation angle of the potentiometer, the opening of the needle valve with a potentiometer. Always detect and line speed The following formula y = px + e (where y is the required flow rate of the liquefied gas, p is the liquefied gas with respect to the known line velocity depending on the conditions of addition of the spilled substance including at least the can type) The change rate of the amount of flow-down, x is the line speed, e is the line-speed, and means the added flow-down amount which is known according to the conditions of addition of the flow-through material including at least can species. Use the gain setter to select and set the necessary p in accordance with the conditions for adding the underflow material containing at least can types, and select the necessary e in accordance with the conditions for adding the underflow products containing at least can types. A line for controlling the opening degree of the needle valve with respect to the line speed according to the conditions of addition of the falling material including at least the can type by a speed / flow rate conversion setting device including an offset setting device Degree / flow rate conversion data is set in advance, and the required flow rate corresponding to the line speed detected by the speed detection means is obtained based on the set line speed / flow rate conversion data, and the required opening amount of the needle valve is calculated from the required flow rate. Is calculated, and the calculated value is compared with the opening amount of the needle valve measured by the potentiometer, and the comparison value is output to a pulse converter to rotate the pulse motor to adjust the opening amount of the needle valve. The flow rate control method of the liquefied gas flow-down apparatus is characterized in that the flow rate of the liquefied gas can be continuously controlled by following the change of the line speed. 2. A method of controlling a flow rate of liquefied gas from a storage tank by adjusting an opening amount of a needle valve provided at a lower portion of the storage tank, wherein an upper end of a needle of the needle valve is a valve opening / closing solenoid. The needle valve is connected to the armature to open and close the needle valve by operating the valve opening / closing solenoid, and an opening adjustment stopper that is vertically driven by a pulse motor is arranged during the stroke of the armature to adjust the stopper up and down. By adjusting the valve opening by transmitting the rotation of the output shaft of the pulse motor to the potentiometer, by converting the movement amount of the stopper into the rotation angle of the potentiometer, the valve opening is always detected by the potentiometer. Liquefaction against line speed In determining the required flow rate of the gas, the following formula y = px + e (where y is the required flow rate of the liquefied gas, p is the flow rate of the liquefied gas with respect to the known line velocity depending on the conditions of addition of the underflow material including at least the can type) Change rate, x is a line speed, e is a line speed, and an added flow rate that is known according to the conditions of addition of the falling material including at least the can type. , A gain setter for selecting and setting the necessary p corresponding to the conditions for adding the underflow material containing at least the can type, and the necessary e corresponding to the conditions for adding the underflow product containing at least the can type. A line speed / flow rate changer that controls the opening of the needle valve with respect to the line speed according to the conditions of addition of the flowable material containing at least the type of can is set by the speed / flow rate change setter, which includes an offset setter to set. Along with presetting the data, a reference line speed that serves as a reference for intermittent dripping or continuous flow of the liquefied gas is set in advance, and the line speed detected by the speed detecting means is higher than the reference line speed. The required flow rate corresponding to the line speed detected by the speed detection means is obtained based on the set line speed / flow rate conversion data, and the required opening amount of the needle valve is calculated from the required flow rate. By comparing the opening amount of the needle valve measured with a potentiometer and outputting the comparison value to the pulse converter and rotating the pulse motor to adjust the opening amount of the needle valve, the line speed can be changed. When the line speed is lower than the reference line speed, the speed in the low speed range is controlled. Liquefaction characterized in that the liquefied gas is intermittently dropped by intermittently driving the solenoid by controlling the dripping timing and the valve opening time according to fluctuations to intermittently drive the solenoid. A method for controlling the flow rate of a gas flow apparatus. 3. A flow rate control device for a liquefied gas flow-down device for controlling the flow-down amount of liquefied gas by adjusting the opening amount of a needle valve provided at the bottom of a storage tank, wherein the upper end of the needle of the needle valve is connected. A valve opening / closing solenoid having an armature, an opening adjustment stopper whose lower end goes in and out from above during the armature stroke of the valve opening / closing solenoid, and a pulse for driving and controlling the opening / closing of the opening adjustment stopper in the armature stroke. A motor and a rotary shaft that is interlocked with the output shaft of the pulse motor, and detects the amount of movement of the opening adjustment stopper by converting the amount of movement of the opening adjustment stopper into the rotation angle of the rotation shaft. Potentiometer to detect needle valve opening and line speed detection to detect line speed In order to obtain the required flow rate of the liquefied gas with respect to the stage and the line speed, the following formula y = px + e (where y is the required flow rate of the liquefied gas and p is known depending on the conditions of addition of the spilled substance including at least the can type) The rate of change of the flow rate of liquefied gas with respect to the line speed, x means the line speed, e means the added flow rate that is known regardless of the line speed and is known according to the conditions of addition of the flowed material containing at least the can type. .), The gain setter for selecting and setting the necessary p corresponding to at least the type of underflow product containing cans, and the corresponding condition for adding the underflow product containing at least can types. Corresponding to the speed detected by the speed detecting means based on the speed / flow rate conversion setter including an offset setter for selecting and setting the required e, and the setting data set by the speed / flow rate conversion setter. From a calculation control unit that calculates the required opening amount of the needle valve, compares the calculated value with the opening amount of the needle valve measured by the potentiometer, and sends a rotation signal to the pulse motor based on the comparison value. A flow-down control device for a liquefied gas flow-down device, which is configured.