WO2006013746A1

WO2006013746A1 - Liquid level detection sensor, liquid pouring device using the sensor, automatic capacity measurement device for container, and liquid level detection method

Info

Publication number: WO2006013746A1
Application number: PCT/JP2005/013579
Authority: WO
Inventors: Minoru Nakano; Naohiro Tanaka; Yosuke Yamamoto
Original assignee: Nihon Yamamura Glass Co., Ltd.
Priority date: 2004-08-04
Filing date: 2005-07-25
Publication date: 2006-02-09
Also published as: JP2006047103A; JP3872486B2

Abstract

Provided are a liquid level detection sensor capable of highly accurately detecting the height of the level of liquid in a container, a liquid pouring device using the sensor, automatic capacity measurement device for a container, and a liquid level detection method. A liquid level detection sensor having an upper electrode rod (2a) and a lower electrode rod (2b) that have different head heights and are appropriately horizontally spaced apart, wherein the upper electrode rod (2a) is formed such that, when the upper electrode rod (2a) and the lower electrode rod (2b) are inserted in a container (P), the head (2a’) of the upper electrode rod (2a) is positioned close to the center line of the level of liquid in the container (P).

Description

Specification

Liquid level detection sensor, liquid injection device using the same, automatic volume measuring device for container, and liquid level detection method

Technical field

[0001] The present invention relates to a liquid level detection sensor for detecting the liquid level height of a liquid injected into a container such as a glass bottle, a plastic bottle, a glass cup, a seasoning container, and a liquid injection apparatus and a container using the same. The present invention relates to an automatic volume measuring apparatus and a liquid level detection method.

Background art

[0002] Generally, in a production line in which containers such as glass bottles and plastic bottles are filled with beverages such as soft drinks and alcoholic beverages, by filling the beverage up to the container's taste line (the position of the contents level of the container), Although a predetermined volume of beverage is filled, in order to make the quality uniform, an inspection is performed to check whether the capacity of the container is within the specified value range. In addition, in the production line for containers such as glass bottles and PET bottles, the container's capacity is within the specified range when the capacity of the container is within the specified value range or when the specified capacity is filled. Inspections are conducted to check the internal forces and containers before shipping.

[0003] Conventionally, as an apparatus for inspecting whether the capacity of a container is within a specified range, there is an automatic capacity measuring apparatus described in Patent Document 1. As shown in FIG. 4 to FIG. 8, this apparatus is a weighing table 11 for measuring the weight of a placed container P, a water supply pipe 12 for injecting liquid into the container P, and a container P being injected into the container P. A liquid level detection sensor 13 for detecting the liquid level of the liquid, a temperature detection sensor 14 for detecting the temperature of the liquid poured into the container P, and a top surface detection sensor 15 for detecting the top surface of the container. Control means 16 for controlling the water supply pipe 12 and calculating the capacity of the container's taste line based on the detection signal from the liquid level detection sensor 13, the temperature detection sensor 14 and the top surface detection sensor 15 and the measurement signal from the weighing table. Is provided.

[0004] The control means 16 receives a measurement signal of the tare weight of the container P from the weighing table 11, calculates the height of the container P and the height to the taste line based on the detection signal from the top surface detection sensor, After injecting the liquid to the height up to the line, the injection of the liquid through the water supply pipe 12 is stopped and the measurement signal of the total weight of the container P at that time is received from the weighing table 11 and detected by the temperature detection sensor 14 Calculate the liquid density, subtract the tare weight of the container P from the total weight of the container P, calculate the weight of the liquid injected into the container P, and divide this liquid weight by the liquid density To calculate the capacity up to the taste line. After calculating the filling line capacity, after the water supply pipe 12 injects further liquid to the top surface, it receives a measurement signal of the total weight of the container P at the time of full filling from the weighing table 11, and receives the signal of the container P at the time of full filling. The total weight force is calculated by subtracting the tare weight of the container P to calculate the weight of the liquid injected into the container P and dividing the weight of the liquid by the density of the liquid to calculate the capacity at the time of filling. Subtract the taste volume from the injection volume to calculate the void volume of container P when liquid is injected up to the taste line.

[0005] The water supply pipe 12 includes a micro water supply pipe 17 having a small diameter S in order to make the injection amount precise, and the control means 16 uses the water supply pipe 12 and the micro water pipe 12 used according to the amount of liquid injected into the container P. Switch the water pipe 1 7.

[0006] A liquid level detection sensor 13 is provided at the lower end of the water supply pipe 12, and the water supply pipe 12 can be moved up and down by the drive means 18, and the water supply pipe 12 is inserted below the container P. Then, liquid injection is started from the water supply pipe 12, and the water supply pipe 12 is gradually moved upward so that the water supply pipe 12 and the liquid level are kept at a predetermined distance by the detection of the liquid level detection sensor 13.

[0007] The water supply pipe 12 is provided with a water absorption nozzle 19 for sucking the liquid injected into the container P, and the water supply pipe 12 and the micro water supply pipe 17 inject excessive liquid beyond the taste line or top surface of the container P. The water absorption nozzle 19 absorbs excess liquid so that the liquid level and the taste line of the container P or the top surface are flush with each other by the detection of the liquid level detection sensor 13.

[0008] A drainage means 20 is provided for draining the liquid in the container P after the full capacity measurement or the taste line capacity measurement is completed. The drainage means 20 grips the container P and opens the opening of the container P downward. A reversing mechanism 21 is provided, and a drain receiver 22 that receives the liquid discharged from the container P is provided.

[0009] The automatic capacity measuring apparatus configured as described above is used as follows. First, when the container P is placed on the weighing table 11, the weighing table 11 measures the tare weight of the container P and issues a measurement signal of the measured tare weight of the container P to the control means 16. After the measurement of the tare weight, the water supply pipe 12 descends and the top surface detection sensor 15 detects the top surface of the container P, and issues a detection signal for the detected top surface of the container P to the control means 16. Upon receiving this detection signal, the control means 16 calculates the height of the container P and the height of the taste line. Then, the water supply pipe 12 descends and the container P When the water supply pipe 12 reaches the stop position at a predetermined interval, the descent of the water supply pipe 12 is stopped.

[0010] After the descent of the water supply pipe 12 stops, liquid injection through the water supply pipe 12 is started. At the time of this injection, first, in order to quickly inject the liquid, the liquid is rapidly injected into the container P using the water pipe 12 having a large diameter. At this time, the temperature detection sensor 14 detects the temperature of the liquid and issues a temperature signal of the detected liquid to the control means 16. When the liquid level detection sensor 13 detects the liquid level of the liquid injected into the container P by the water supply pipe 12, the water supply pipe 12 gradually rises while maintaining a predetermined distance from the liquid level. Then, when the liquid level of the liquid in the container P approaches the taste line of the container P, the liquid is injected using the small water supply pipe 17 having a small diameter in order to make the injection amount precise. After that, after injecting a slightly larger amount of liquid than the predetermined weight, the injection of the liquid is stopped, and then the water absorption nozzle 19 causes the liquid level and the filling line of the container P to be flush with each other. To absorb water. When the water level is flush with the taste line of the container P due to this water absorption, the water absorption by the water suction nozzle 19 is stopped, and the liquid injection to the taste line of the container is finished.

[0011] When the injection of the liquid up to the filling line of the container P is finished, the weighing table 11 measures the total weight of the container P when the filling line capacity is reached, and issues a measurement signal of the measured total weight of the container P to the control unit. . The control unit 16 calculates the weight of the liquid injected into the container P by subtracting the tare weight of the container P from the total weight of the container, and uses the weight of the liquid as a detection signal from the temperature detection sensor 14. The taste line capacity is calculated by dividing by the calculated density of the liquid.

[0012] After calculating the taste line capacity, when the water supply pipe 12 descends again and the liquid level detection sensor 13 detects the liquid level in the container P, the descent of the water supply pipe 12 stops. After the descent of the water supply pipe 12 stops, liquid injection through the micro water supply pipe 17 is started, and the water supply pipe 12 gradually rises while maintaining a distance from the liquid level. Then, when the liquid level of the liquid in the container P slightly exceeds the top surface of the container P, the liquid injection by the micro water supply pipe 17 is stopped, and then the water absorption nozzle 19 is caused by the top surface force and surface tension of the container P. Absorb the excess liquid so that the liquid level and the top of the container P are flush with each other. When the liquid level and the top surface of the container P are flush with each other due to this water absorption, the water absorption by the water absorption nozzle 19 is stopped and the liquid injection to the top surface of the container P is finished. [0013] Thereafter, the water supply pipe 12 rises again, and the micro water supply pipe 17 and the water absorption nozzle 19 are pulled out from the liquid in the container P. In this state, the weighing table 11 measures the total weight of the container P into which the liquid has been poured up to the top surface, and issues a measurement signal of the measured total weight of the container P to the control means 16.

[0014] The control means 16 calculates the weight of the liquid injected into the container P by subtracting the tare weight of the container P from the total weight of the container P at the time of full filling, and calculates the calculated liquid weight by the density of the liquid. Calculate the full volume of the injected liquid by dividing. Subtract the filling line capacity from the full capacity of this liquid to calculate the space void volume of the container P from the filling line force to the top. As a result, it is possible to automatically measure the void volume of the container P after the liquid is injected into the taste line capacity.

[0015] When the measurement of the full capacity is completed, the draining means 20 is reversed so that the opening of the container faces downward while holding the container P after the measurement, and the liquid in the container P after the measurement is drained. Patent Document 1: Japanese Patent Laid-Open No. 2002-202173

Disclosure of the invention

Problems to be solved by the invention

By the way, as shown in FIGS. 7 and 8, the liquid level detection sensor 13 of the automatic container volume measuring device described above has an upper electrode bar 13a and a lower electrode bar 13 having different tip heights (lower ends). In the state where the upper electrode bar 13a and the lower electrode bar 13b are inserted into the container P together with the water supply pipe 12, the micro water supply pipe 17 and the water absorption nozzle 19, the liquid is injected or absorbed into the container P. The upper and lower electrode rods 13a and 13b are conducted through the liquid when the liquid level of the liquid rises or falls and the tip of the upper electrode rod 13a comes into contact with the liquid or is exposed on the liquid surface. Alternatively, when the upper and lower electrode rods 13a and 13b are disconnected from each other through the liquid, it is determined that the tip of the upper electrode rod 13a is positioned at a height that matches the liquid level. Therefore, it detects the liquid level of the liquid in the container P. The upper electrode rod i _3a and the lower electrode rod 3b are supported by the contraction tube 23 on the outer periphery of the tip (lower end) of the water supply pipe 12 composed of a straight pipe, and the tip portions are spaced at an appropriate interval in the horizontal direction. It is placed straight and protrudes downward from the tip 12a of the water supply pipe 12.

However, in the conventional liquid level detection sensor 13, the upper electrode rod 13a and the lower electrode rod 13b are arranged at an appropriate distance in the horizontal direction, and the upper electrode rod 11a and the lower electrode rod 13b The tip partial force S of the electrode rod l ib is a structure that protrudes downward from the tip 12a of the water supply pipe 12 in a straight state, and thus has the following problems. That is, in order to detect the liquid level height of the liquid in the container P with high accuracy, when the inner diameter near the mouth of the container P is thin, the liquid level of the liquid forms a concave meniscus curve. It is necessary to detect the liquid level at the center of the liquid level. However, in the liquid level detection sensor 13, the upper electrode rod 13a and the lower electrode rod 13b are arranged in the horizontal direction at an appropriate interval, and the upper end portions of the upper electrode rod 11a and the lower electrode rod l ib are arranged. Is straight and protrudes downward from the tip 12a of the water supply pipe 12.Therefore, a deviation distance (the upper electrode bar 13a and the upper electrode bar 13a and the lower electrode bar 13b, between the center line of the water supply pipe 12 and the upper electrode bar 13a and the lower electrode bar 13b. When the water supply pipe 12 is inserted into the container P in a normal state in which the center line of the lower electrode bar 13b is present and the center line of the water supply pipe 12 and the center line of the container P coincide with each other, The tip of 13a is located at a position that is out of the center force deviation distance of the liquid level, which means that the liquid level of the liquid is detected at a position outside the deviation distance from the center, and the liquid level of the liquid is accurately detected. There is a problem that cannot be detected.

[0018] The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a liquid that can detect the liquid level of the liquid in the container with high accuracy. An object of the present invention is to provide a surface detection sensor, a liquid injection device using the same, an automatic volume measuring device for a container, and a liquid detection method.

Means for solving the problem

[0019] In order to achieve the above object, the present invention has an upper electrode bar and a lower electrode bar having different heights at the tips and appropriately spaced in the horizontal direction. The upper electrode bar and the lower electrode bar When the tip of the upper electrode rod comes into contact with the liquid while the electrode is inserted into the container, or when the tip of the upper electrode rod is exposed on the liquid surface, the upper and lower electrode rods are conducted through the liquid, or In a liquid level detection sensor that detects the liquid level of the liquid by cutting off the conduction of the upper and lower electrode rods through the liquid, when the upper electrode rod and the lower electrode rod are inserted into the container, The electrode rod is a liquid level detection sensor characterized in that its tip is formed so as to be close to the center line of the liquid level of the liquid in the container.

[0020] Preferably, the tip portion of the upper electrode rod is bent toward the center line of the liquid level of the liquid in the container, and the tip is bent vertically downward at the position where the tip is bent to the center line. Then An end bent portion is formed. In addition, an AC current is allowed to flow between the upper and lower electrode rods. Furthermore, the upper and lower electrode rods are made of a metal material having excellent corrosion resistance.

[0021] According to the liquid level detection sensor of the invention configured as described above, when the upper electrode bar and the lower electrode bar are inserted into the container, the tip of the upper electrode bar is the center of the liquid level of the liquid in the container. Since it is located on the line, it is possible to detect the liquid level of the liquid in the container at the center of the liquid level, and the liquid level of the liquid in the container can be detected with high accuracy. In addition, since the tip bent portion of the upper electrode rod is located on the center line of the container, the liquid level of the liquid in the container can be detected regardless of the size of the liquid level in the container. In addition, no electrochemical reaction (electric corrosion) occurs in the upper electrode rod and lower electrode rod, and the occurrence of corrosion due to the electric corrosion of the upper electrode rod and lower electrode rod is suppressed, thereby reducing the detection accuracy of the liquid level. Can be prevented. Furthermore, it is possible to suppress the occurrence of wrinkles of the upper electrode rod and the lower electrode rod, and to stabilize the conductivity of the upper electrode rod and the lower electrode rod over a long period of time.

[0022] The present invention further includes a water supply pipe that is inserted into the container and injects the liquid, and a liquid level detection sensor that detects the liquid level of the liquid injected into the container, and detects the liquid level. The sensor has an upper electrode rod and a lower electrode rod attached to the outer periphery of the tip of the water supply pipe with different heights at the tip and at an appropriate interval in the horizontal direction, and inserted into the container together with the water supply pipe. In this state, when the tip of the upper electrode rod comes into contact with the liquid or is exposed on the liquid surface, the upper and lower electrode rods are conducted through the liquid or the liquid of the upper and lower electrode rods is discharged. This is a liquid injection device that detects the liquid level by disconnecting the continuity through the line! When the upper electrode bar and lower electrode bar of the liquid level detection sensor are inserted into the container, the upper electrode bar is formed so that the tip thereof is close to the center line of the liquid level of the liquid in the container. The liquid injection device is characterized by the above.

[0023] Preferably, the tip portion of the upper electrode rod is bent toward the center line of the liquid level of the liquid in the container, and the tip is bent vertically downward at the position where the tip is bent to the center line. Thus, a bent end portion is formed. In addition, an AC current is allowed to flow between the upper and lower electrode rods. Furthermore, the upper and lower electrode rods are made of a metal material having excellent corrosion resistance. [0024] According to the liquid injection device of the present invention configured as described above, when the water supply pipe is inserted into the container in a normal state in which the center line coincides with the center line of the container, the tip of the upper electrode rod is Since it is located on the center line of the liquid level of the liquid in the container, it is possible to detect the liquid level of the liquid in the container at the center of the liquid level, and the liquid level of the liquid in the container with high accuracy. Can be detected. Further, since the tip bent portion of the upper electrode rod is located on the center line of the container, the liquid level of the liquid in the container can be detected regardless of the liquid surface diameter of the liquid in the container. In addition, the upper electrode rod and lower electrode rod do not cause electric corrosion, and the corrosion of the upper electrode rod and lower electrode rod is prevented from being corroded to prevent deterioration of the liquid level detection accuracy. can do. Furthermore, it is possible to suppress the occurrence of wrinkles of the upper electrode rod and the lower electrode rod, and it is possible to stabilize the conductivity of the upper electrode rod and the lower electrode rod over a long period of time.

[0025] The present invention also provides a measuring platform for measuring the weight of the container, a water supply pipe that is inserted into the container to inject the liquid, and a liquid that detects the liquid level of the liquid injected into the container. A surface detection sensor, a temperature detection sensor for detecting the temperature of the liquid to be injected into the container, a top surface detection sensor for detecting the top surface of the container, a water supply pipe, a liquid level detection sensor, and a temperature detection The liquid level detection sensor is equipped with a sensor, a sensor for detecting the top surface detection sensor force, and a control means for calculating the filling line capacity, full filling capacity, void volume or filling line height of the container based on the measurement signal from the weighing table. The upper and lower electrode rods are attached to the outer periphery of the front end of the water supply pipe with an appropriate distance in the horizontal direction and with different heights at the tip, and are inserted with the water supply pipe into the container. When the tip of the upper electrode rod comes into contact with the liquid in the When exposed above, the upper and lower electrode rods are conducted through the liquid, or the conduction of the upper and lower electrode rods through the liquid is interrupted to reduce the liquid level. In an automatic volume measuring device for a container designed to detect, when the upper electrode rod and lower electrode rod of the liquid level detection sensor are inserted into the container, the upper electrode rod has its tip at the liquid in the container. An automatic volume measuring device for a container, characterized in that the container is formed so as to approach the center line of the liquid level.

[0026] Preferably, the tip of the upper electrode rod is bent toward the center line of the liquid level of the liquid in the container, and the tip is bent vertically downward at the position where the tip is bent to the center line. Then An end bent portion is formed. In addition, an AC current is allowed to flow between the upper and lower electrode rods. Furthermore, the upper and lower electrode rods are made of a metal material having excellent corrosion resistance.

[0027] According to the automatic volume measuring apparatus for a container of the present invention configured as described above, when the water supply pipe is inserted into the container in a normal state in which the center line coincides with the center line of the container, the upper electrode Since the tip of the rod is positioned on the center line of the liquid level of the liquid in the container, the liquid level of the liquid in the container can be detected at the center of the liquid level, and the liquid in the container can be accurately detected. The liquid level can be detected. Further, since the tip bent portion of the upper electrode rod is located on the center line of the container, the liquid level of the liquid in the container can be detected regardless of the liquid surface diameter of the liquid in the container. Moreover, the upper electrode rod and the lower electrode rod do not cause electric corrosion, and the occurrence of corrosion due to the electric corrosion of the upper electrode rod and the lower electrode rod can be suppressed to prevent a decrease in detection accuracy of the liquid level. . Furthermore, it is possible to suppress the occurrence of wrinkles or the like of the upper electrode rod and the lower electrode rod, and to stabilize the conductivity of the upper electrode rod and the lower electrode rod over a long period of time.

[0028] Further, the present invention includes a liquid level detection sensor having an upper electrode bar and a lower electrode bar that have different heights at the tip and are spaced at appropriate intervals in the horizontal direction. When the tip of the upper electrode rod comes into contact with the liquid or is exposed on the liquid surface, the upper and lower electrode rods are conducted through the liquid or the upper and lower electrode rods are inserted. In the liquid level detection method of detecting the liquid level by disconnecting the liquid through the liquid, the upper electrode rod of the liquid level detection sensor is placed at the center of the liquid level in the container. The liquid level detection method is characterized in that it is arranged on a line and inserted into a container.

[0029] Preferably, an alternating current is allowed to flow between the upper and lower electrode rods. In addition, the upper and lower electrode rods are made of a metal material having excellent corrosion resistance.

[0030] According to the liquid level detection method of the present invention configured as described above, since the tip of the upper electrode rod is located on the center line of the liquid level of the liquid in the container, the liquid level of the liquid in the container is high. The height of the liquid in the container can be detected with high accuracy. The Moreover, the upper electrode rod and the lower electrode rod do not cause electric corrosion, and the occurrence of corrosion due to the electric corrosion of the upper electrode rod and the lower electrode rod can be suppressed to prevent a decrease in detection accuracy of the liquid level. . Furthermore, it is possible to suppress the occurrence of wrinkles or the like of the upper electrode rod and the lower electrode rod, and to stabilize the conductivity of the upper electrode rod and the lower electrode rod over a long period of time.

The invention's effect

[0031] According to the present invention, the liquid level of the liquid in the container can be detected at the center of the liquid level, and the liquid level of the liquid in the container can be detected with high accuracy. It is possible to provide a detection sensor, a liquid injection device using the detection sensor, a container automatic volume measuring device, and a liquid detection method.

[0032] Further, since it is possible to suppress the occurrence of electrical corrosion of the upper electrode rod and the lower electrode rod of the liquid level detection sensor, it is possible to stabilize the conductivity of the liquid level detection sensor, and It is possible to maintain the detection accuracy of the liquid level over a long period of time.

Brief Description of Drawings

FIG. 1 is a front view of a liquid level detection sensor of the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is an enlarged bottom view of FIG.

FIG. 4 is a schematic front view of an automatic container volume measuring device.

FIG. 5 is a side view showing a measuring unit of the automatic capacity measuring device of FIG.

FIG. 6 is a configuration diagram schematically showing a measuring apparatus.

FIG. 7 is a front view of a conventional liquid level detection sensor.

FIG. 8 is a side sectional view of FIG.

Explanation of symbols

[0034] P container

1 Water supply pipe

2 Liquid level detection sensor

2a Upper electrode rod

2a 'Tip bent part 2b Lower electrode rod

3 Micro water supply pipe

4 Water absorption nozzle

5 Shrink tube

BEST MODE FOR CARRYING OUT THE INVENTION

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

1 to 3 show an embodiment of the liquid level detection sensor of the present invention, FIG. 1 is a front view of the liquid level detection sensor, FIG. 2 is a side sectional view of the liquid level detection sensor, and FIG. It is an enlarged bottom view of a liquid level detection sensor.

In FIG. 1 to FIG. 3, 1 is a water supply pipe that is inserted into the container P and injects a liquid such as drinking water, and 2 is a container in the container P attached to the tip (lower end) of the water supply pipe 1. Liquid level detection sensors for detecting the liquid level, 3 and 4 are minute water supply pipes used to precisely fill the liquid in the container P attached to the outer periphery of the water supply pipe 1 along the axial direction. And a water absorption nozzle.

[0038] The water supply pipe 1 is composed of a straight pipe that can be inserted into the container, and can be moved up and down by a driving means (not shown). As a result of detection by the detection sensor 2, the tip la and the liquid level gradually move upward so as to maintain a predetermined distance.

[0039] The liquid level detection sensor 2 has an upper electrode rod 2a and a lower electrode rod 2b having different tip height positions, and an AC voltage of an AC power source is applied between the upper and lower electrode rods 2a, 2b. In the state of being inserted into the container P together with the water supply pipe 1, the liquid level of the liquid in the container P rises due to the liquid injection, and the tips of the upper and lower electrode rods 2a, 2b come into contact with the liquid. Then, an alternating current flows between the upper and lower electrode rods 2a and 2b through this liquid. Then, the liquid level detection sensor 2 detects the alternating current flowing between the upper and lower electrode rods 2a, 2b, so that the tip of the upper electrode rod 2a is positioned at a height matching the liquid level. It determines and detects the liquid level of the liquid in a container by it. The upper electrode rod 2a and the lower electrode rod 2b are supported by the contraction tube 5 on the outer peripheral portion of the water supply pipe 1, and their tip portions protrude below the tip la of the water supply pipe 1. The upper electrode rod 2a The lower electrode rods 2b are arranged on the outer peripheral portion of the water supply pipe 1 so as to face each other by 180 ° and at an appropriate interval in the horizontal direction. The tip of the upper electrode 2a is bent obliquely downward toward the center line of the water supply pipe 1, and further bent vertically downward at the position where the tip is bent to the center line of the water supply pipe 1. The tip bent portion 2a 'is formed. On the other hand, the lower electrode rod 2b is provided with a sufficient space (a space where it does not touch each other) between the upper electrode rod 2a and the front electrode portion 2b. It is slightly bent downward and downward. The upper electrode rod 2a and the lower electrode rod 2b are made of platinum in the present embodiment. Platinum has excellent corrosion resistance and can suppress the occurrence of wrinkles in the upper electrode rod 2a and the lower electrode rod 2b, and can stabilize the conductivity of the upper electrode rod 2a and the lower electrode rod 2b over a long period of time. .

[0040] The minute water supply pipe 3 and the water absorption nozzle 4 are attached to the outer periphery of the water supply pipe 1 in the axial direction, and are supported by the contraction tube 5 together with the upper electrode bar 2a and the lower electrode bar 2b. The minute water supply pipe 3 and the water absorption nozzle 4 are arranged on the outer periphery of the water supply pipe 1 so as to face each other by 180 °, and the tip portion protrudes below the tip la of the water supply pipe 1 and the tip is further higher. It is located below the tips of the electrode rod 2a and the lower electrode rod 2b. Also, the fine water supply pipe 3 and the water suction nozzle 4 are arranged on the outer periphery of the water supply pipe 1 at a distance of 90 ° from the upper electrode rod 2a and the lower electrode rod 2b! .

[0041] In the above configuration, after the measurement of the tare weight of the container P is completed on the weighing platform (not shown), the water supply pipe 1 is lowered and the top surface detection sensor (not shown) moves the top surface of the container P. The control means (not shown) that has detected and received the detection signal of the detected top surface of the container P calculates the height of the container P and the height of the taste line. Then, the water supply pipe 1 is lowered and inserted into the container P, and when the water supply pipe 1 reaches a stop position at a predetermined interval from the bottom surface of the container P, the descent of the water supply pipe 1 is stopped. .

When the water supply pipe 1 stops descending, liquid injection through the water supply pipe 1 is started. At the time of this injection, first, the liquid is rapidly injected into the container P using the large diameter water supply pipe 1 in order to quickly inject the liquid. At this time, a temperature detection sensor (not shown) detects the temperature of the liquid, and issues a temperature signal of the detected liquid to the control means. When liquid is injected into the container P through the water supply pipe 1, the liquid gradually accumulates in the container P, the liquid level rises, and the liquid level is detected. When the tip of the lower electrode rod 2b of sensor 2 is immersed in the liquid and the liquid level rises and the tip bent portion 2a 'of the upper electrode rod 2a comes into contact with the liquid, the upper and lower electrode rods 2a, 2b An alternating current flows between the upper and lower electrode rods 2a, 2b through the liquid, and the liquid level in the container P is detected by detecting this alternating current. When the liquid level detection sensor 2 detects the liquid level of the liquid injected into the container P by the water supply pipe 1, the water supply pipe 1 gradually rises while maintaining a predetermined distance from the liquid level. When the liquid level of the liquid in the container P approaches the taste line of the container P, the liquid is injected using the small water supply pipe 3 having a small diameter in order to make the injection amount precise. Then, after injecting a slightly larger amount of liquid than the specified weight, the injection of the liquid is stopped, and then the water absorption nozzle 4 removes excess liquid so that the liquid surface and the filling line of the container P are flush with each other. Absorb water. When excess water is absorbed by the water absorption nozzle 4, the liquid level in the container P falls due to this water absorption, and when the liquid level of the liquid and the taste line of the container P are flush with each other, the upper electrode rod 2a The tip bent portion 2a 'is exposed on the liquid surface, and the conduction state through the liquid of the upper and lower electrode rods 2a, 2b is interrupted to detect the liquid surface height of the liquid in the container P. Water absorption by the water absorption nozzle 4 is stopped, and the liquid injection up to the container's taste line ends.

[0043] When the injection of the liquid up to the taste line of the container P is finished, the water supply pipe 1 is lifted again to pull out the water supply pipe 1 from the container P. In this state, the control means measures the total weight of the container P when the filling line capacity is reached, and the control means receiving the measurement signal of the measured total weight of the container P subtracts the total weight force of the container and the tare weight of the container P. The weight of the liquid injected into the container P is calculated, and the weight of the liquid is calculated by dividing the weight of the liquid by the density of the liquid calculated by the detection signal of the temperature detection sensor force.

[0044] After calculating the taste line capacity, when the water supply pipe 1 descends again and the tips of the upper and lower electrode rods 2a, 2b of the liquid level detection sensor 2 come into contact with the liquid, the upper and lower electrode rods 2a, 2b Becomes conductive through the liquid and detects the liquid level in the container P. When the liquid level detection sensor 2 detects the liquid level in the container P, the descent of the water supply pipe 1 stops and the liquid supply by the micro water supply pipe 3 starts, and the water supply pipe 1 keeps the distance from the liquid level. When the liquid level in the container P slightly exceeds the top surface of the container P, the injection of the liquid through the micro water supply pipe 3 stops, and then the water absorption nozzle 4 moves to the container P. The surface force is raised by the surface tension. Absorb excess liquid so that the liquid level is flush with the top of the container P. When the liquid level of the liquid and the top surface of the container P are flush with each other due to this water absorption, the bent end 2a 'of the upper electrode rod 2a is exposed on the liquid surface, and the upper and lower electrode rods 2a, 2a, When the state of conduction through the liquid of 2b is interrupted, the liquid level in the container P is detected, the water absorption by the water absorption nozzle 4 is stopped, and the liquid injection to the top surface of the container P is finished.

[0045] Thereafter, the water supply pipe 1 rises again, and the fine water supply pipe 3 and the water absorption nozzle 4 are pulled out from the liquid in the container P. In this state, the weighing platform measures the total weight of the container P into which the liquid has been injected up to the top surface, and the control means receiving the measurement signal of the measured total weight of the container P Subtract the tare weight of container P from the total weight to calculate the weight of the liquid injected into container P, and calculate the full capacity of the injected liquid by dividing the calculated liquid weight by the liquid density. . Subtract the taste volume from the full capacity of this liquid and calculate the space void volume of the container P from the taste line to the top. As a result, it is possible to automatically measure the void volume of the container P after the liquid is injected into the taste line capacity. When the measurement of the full capacity is completed, the discharging means (not shown) is flipped so that the opening of the container faces downward while holding the measured container P, and the liquid in the measured container P is drained. To do.

In the present embodiment, the tip bent portion 2a ′ of the upper electrode rod 2a of the liquid level detection sensor 2 is formed so as to be located on the center line of the water supply pipe 1! When the water supply pipe 1 is inserted into the container P in a normal state where the center line and the center line of the container P are aligned with each other, the bent end 2a 'of the upper insertion pole 2a becomes the liquid level of the liquid in the container P. By being positioned on the center line, the liquid level of the liquid can be detected at the center of the liquid level, the inner diameter near the mouth is small, and even in the case of the container, the liquid level of the liquid in the container is highly accurate. The height can be detected.

In the present embodiment, since an alternating current is caused to flow between the upper and lower electrode rods 2a, 2b of the liquid level detection sensor 2, the following advantages are obtained. In other words, when a direct current is passed between the upper and lower electrode rods 2a and 2b of the liquid level detection sensor 2, an electrochemical reaction (electrolytic corrosion) has occurred in the upper electrode rod 2a and the lower electrode rod 2b. When an alternating current is passed between the upper and lower electrode rods 2a and 2b of the detection sensor 2, the upper electrode rod 2a and the lower electrode rod 2b do not cause an electrochemical reaction (electric corrosion). It is possible to prevent deterioration of detection accuracy by suppressing the occurrence of corrosion due to electric corrosion of the upper electrode rod 2a and the lower electrode rod 2b. [0048] Further, in the present embodiment, the upper electrode rod 2a and the lower electrode rod 2b of the liquid level detection sensor 2 are made of platinum having excellent corrosion resistance. It is possible to suppress the occurrence of defects and to stabilize the conductivity of the upper electrode rod 2a and the lower electrode rod 2b over a long period of time.

[0049] In the present embodiment, the lower electrode rod 2b of the liquid level detection sensor 2 is provided with a sufficient distance from the tip portion of the upper electrode rod 2a. Bend slightly diagonally downward toward the line, but don't touch each other! If there is a gap, the front end portion may not be bent slightly diagonally downward toward the center line of the water supply pipe 1 outward.

[0050] In the present embodiment, the upper electrode rod 2a and the lower electrode rod 2b of the liquid level detection sensor 2 are made of platinum. However, the present invention is not limited to platinum, and a metal material having excellent corrosion resistance, for example, Titanium or the like can be used.

[0051] Further, in the present embodiment, the force described in the case where the liquid level detection sensor 2 according to the present invention is used in the automatic volume measuring device of the container shown in Figs. 4 to 6 is described. The intelligent sensor 2 can be used for a liquid injection device that only injects liquid into the container P through the water supply pipe 1, and also when only detecting the liquid level of the liquid in the container P. You can!

[0052] Furthermore, the present invention is not limited to the configuration of the above embodiment, and the center line of the water supply pipe 1 and the center line of the container P coincide with each other. Other configurations may be adopted as long as the tip of the upper electrode rod 2a of the surface detection sensor 2 is located even on the center line of the liquid level of the liquid in the container P.

Claims

The scope of the claims

[1] The upper and lower electrode rods have different tip height positions and are spaced at appropriate intervals in the horizontal direction, and the upper and lower electrode rods are inserted into the container in the upper position. When the tip of the electrode rod comes into contact with the liquid or is exposed on the liquid surface, the upper and lower electrode rods are conducted through the liquid, or the upper and lower electrode rods are conducted through the liquid. In the liquid level detection sensor that detects the liquid level height by being cut off, when the upper electrode bar and the lower electrode bar are inserted into the container, the upper electrode bar has its tip at the liquid level of the liquid in the container. A liquid level detection sensor characterized in that it is formed so as to approach the center line of the liquid.

[2] Bend the tip of the upper electrode rod toward the center line of the liquid level in the container, and then fold it vertically downward at the position where the tip is bent to the center line. 2. The liquid level detection sensor according to claim 1, wherein a bent end portion is formed.

[3] The liquid level detection sensor according to claim 1 or 2, wherein an alternating current is allowed to flow between the upper and lower electrode rods.

[4] The liquid level detection sensor according to any one of [1] to [3], wherein the upper and lower electrode rods are made of a metal material having excellent corrosion resistance.

5. The liquid level detection sensor according to claim 4, wherein platinum is used as a metal having excellent corrosion resistance.

[6] A water supply pipe that is inserted into the container and injects the liquid, and a liquid level detection sensor that detects the liquid level of the liquid injected into the container. The liquid level detection sensor has a height at the tip. With the upper electrode rod and lower electrode rod attached to the outer periphery of the tip of the water supply pipe at different positions and at an appropriate interval in the horizontal direction, the upper electrode is inserted in the container together with the water supply pipe. When the tip of the rod comes into contact with the liquid or is exposed on the liquid surface, the upper and lower electrode rods are conducted through the liquid, or the upper and lower electrode rods are conducted through the liquid. In a liquid injection device that detects the liquid level when the liquid is cut off,

When the upper electrode rod and lower electrode rod of the liquid level detection sensor are inserted into the container, The electrode rod is formed so that its tip approaches the center line of the liquid level in the container.

V liquid injection device characterized by squeezing.

[7] Bend the tip of the upper electrode rod toward the center line of the liquid level in the container, and then fold it vertically downward at the position where the tip is bent to the center line. 7. The liquid injection device according to claim 6, wherein a tip bent portion is formed.

[8] The liquid injection device according to [6] or [7], wherein an alternating current is allowed to flow between the upper and lower electrode rods of the liquid level detection sensor.

[9] The liquid injection device according to any one of [6] to [8], wherein the upper and lower electrode rods of the liquid level detection sensor are made of a metal material having excellent corrosion resistance.

10. The liquid injection device according to claim 9, wherein platinum is used as the metal having excellent corrosion resistance.

[11] A weighing table for measuring the weight of the container, a water supply pipe inserted into the container to inject liquid, a liquid level detection sensor for detecting the liquid level of the liquid injected into the container, and the container A temperature detection sensor that detects the temperature of the liquid to be injected into the inside, a top surface detection sensor that detects the top surface of the container, and a water supply pipe that controls the liquid level detection sensor, temperature detection sensor, and top surface detection sensor. And a control means for calculating the container filling line capacity, full filling capacity, void volume or filling line height based on the detection signal and the measurement signal from the weighing table.The liquid level detection sensor is positioned at the tip height position. The upper electrode rod and the lower electrode rod are attached to the outer periphery of the tip of the water supply pipe at an appropriate interval in the horizontal direction, and the tip of the upper electrode rod is inserted into the container together with the water supply pipe. When is in contact with liquid or exposed on the liquid surface The liquid level of the liquid is detected when the upper and lower electrode rods are connected through the liquid or when the upper and lower electrode rods are disconnected through the liquid. In automatic capacity measuring equipment,

When the upper electrode bar and lower electrode bar of the liquid level detection sensor are inserted into the container, the upper electrode bar is formed so that its tip approaches the center line of the liquid level of the liquid in the container. A device for automatically measuring the volume of a container.

[12] Bend the tip of the upper electrode rod toward the center line of the liquid level in the container, and then fold it vertically downward at the position where the tip is bent to the center line. At the tip bend 12. The automatic volume measuring device for a container according to claim 11, wherein the device is formed.

[13] The container automatic volume measuring device according to [11] or [12], wherein an alternating current is allowed to flow between the upper and lower electrode rods of the liquid level detection sensor.

[14] The automatic volume measuring device for containers according to any one of [11] to [13], wherein the upper and lower electrode rods of the liquid level detection sensor are made of a metal material having excellent corrosion resistance.

15. The automatic capacity measuring device for a container according to claim 14, wherein platinum is used as a metal having excellent corrosion resistance.

[16] A liquid level detection sensor having an upper electrode bar and a lower electrode bar that have different heights at the tip and are spaced at an appropriate interval in the horizontal direction. With the liquid level detection sensor inserted into the container, When the tip of the upper electrode rod comes into contact with the liquid or is exposed on the liquid surface, the upper and lower electrode rods are conducted through the liquid, or the upper and lower electrode rods are conducted through the liquid. In the liquid level detection method of detecting the liquid level height by being cut off,

A liquid level detection method, characterized in that an upper electrode rod of a liquid level detection sensor is arranged on a center line of a liquid level of a liquid in a container and is inserted into a container.

17. The liquid level detection method according to claim 16, wherein an alternating current is passed between the upper and lower electrode rods of the liquid level detection sensor.

18. The liquid level detection method according to claim 16 or 17, wherein the upper and lower electrode bars of the liquid level detection sensor are made of a metal material having excellent corrosion resistance.

[19] The liquid level detection method according to [18], wherein platinum is used as the metal having excellent corrosion resistance.