JPH035597Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The invention relates to a shipping device, and in particular, when shipping liquid to a tank such as a lorry vehicle, it detects the level of the liquid supplied in the tank to prevent overflow. The present invention relates to a shipping device configured to do so.

Conventional technology Conventionally, for example, in a shipping device that ships liquid to the tank of a tank truck, if a flow rate exceeding a predetermined amount set according to the tank capacity at the time of shipping is supplied, a rise in the liquid level in the tank is detected. There are various devices that prevent the liquid from overflowing from the tank by blocking the pipe line that supplies the liquid. Conventionally used or proposed devices for detecting overflow in shipping equipment include, for example, a float-type device that detects a rise in the liquid level by the displacement of a float, and an optical sensor that uses an optical sensor to detect the liquid level. An optical device that detects the liquid level, a capacitive device that detects the liquid level by detecting changes in capacitance, and a capacitive device that detects the liquid level by detecting changes in capacitance. There are gravimetric devices that detect the liquid level based on changes in the apparent weight of a weight.

Problems to be Solved by the Invention However, when using the conventional shipping device described above, for example, when shipping heated liquid asphalt to a lorry truck, the device described above does not require a device to detect displacement according to the liquid level height of the float. When the movable part of the target comes into contact with the liquid surface, the asphalt invades the movable part and sticks to it, preventing normal operation. Another drawback of this device was that asphalt vapor from the heated asphalt liquid surface adhered to the light emitting part and the light receiving part of the optical sensor, impeding the liquid level detection operation. In addition, in order to output a detection signal of changes in capacitance when shipping to a movable tank such as a lorry, we have installed a capacitance system that comes in contact with the liquid, which is installed at the tip of the loading arm of the shipping device. The disadvantage is that it is necessary to install a cable up to the sensor, which is very inconvenient. Furthermore, in this case, the weight must be inserted into the tank separately from the fuel supply port along with the loading arm, and for this, the opening area of the tank fluid supply port must be large to some extent, or I had no choice but to make the diameter smaller. Depending on the tank, the weight cannot be inserted into the tank and overflow cannot be detected.
There was a problem that it took a long time to supply liquid.

Therefore, with conventional shipping equipment, it is necessary to reliably detect the level of liquids such as molten asphalt, which is heated during shipping and has high temperature, high viscosity, high adhesiveness, and no permeability, to prevent overflow. It was difficult to prevent it.

SUMMARY OF THE INVENTION An object of the present invention is to provide a shipping device that eliminates the above drawbacks by detecting weight changes when buoyancy from the liquid surface acts on the insertion tube provided at the tip of the loading arm.

Means and Effects for Solving the Problem The present invention is provided so that it is loosely fitted around the outer periphery of the tip of a loading arm and is displaceable in the vertical direction with respect to the loading arm, and when supplying liquid, the tip of the loading arm is displaceable. an insertion tube inserted into the liquid supply container as it moves to the liquid supply port; a weight detector from which the insertion tube is suspended and attached to the loading arm to detect the weight of the insertion tube; , determining that the detection signal output from the weight detector has reached a preset value based on a change in the weight of the insertion tube due to buoyancy when the insertion tube is immersed in the liquid in the container; the control means for outputting an overflow detection signal, and the liquid supply stop means for stopping the liquid supply in response to the input of the overflow detection signal; It is designed to prevent overflow from the container by detecting weight changes when buoyancy is applied from the surface.

Embodiment FIG. 1 shows an embodiment of the shipping device according to the present invention. In FIG. 1, a liquid storage tank 1 stores asphalt as a viscous liquid. The asphalt in the liquid storage tank 1 is heated to a temperature of about 200° C. by a heater 2 built into the liquid storage tank 1, and is turned into a low-viscosity liquid that can be easily shipped through a pipe 3.

The piping 3 is provided with a pump 4 that pumps heated asphalt, and a metering valve 6 that opens and closes when supplied with an on-off valve signal from the loading control circuit 5. Furthermore, a loading arm 8 is provided at the tip of the pipe 3 to be inserted into an insertion opening 7b of a hatch 7a of the lorry vehicle 7.

Reference numeral 9 denotes a liquid level detection section, which is attached to the tip of the loading arm 8. As shown in FIG. 2, the liquid level detection section 9 is suspended from a crank-shaped bracket 10 fixed to the upper surface of the tip 9a of the loading arm 8. Therefore, the liquid level detection section 9 can be easily attached to the conventionally installed loading arm 8 by simply providing the bracket 10. Reference numeral 11 denotes an insertion tube, which is inserted loosely into the outer periphery of the tip opening 8a of the loading arm 8 so as to be vertically displaceable with respect to the loading arm 8, and has an inner diameter larger than the outer diameter of the loading arm 8. It has dimensions. The insertion tube 11 is provided with a float 12 on the outer periphery of a distal end portion 11a that is inserted into the hatch 7a from the insertion port 7b. Further, a U-shaped hanging member 13 for suspending the insertion tube 11 is attached to the upper end of the insertion tube 11.

Reference numeral 14 denotes a weight detector, which is fixed to the mounting portion 10a of the bracket 10 so as to be located above the tip opening 8a of the loading arm 8.
It is supported by a loading arm 8 via 0. Further, a hook-shaped hook 15 for suspending the hanging member 13 is provided on the lower surface of the weight detector 14. Therefore, the insertion tube 11 is
3, and is suspended by a hook 15 through the loading arm 8.
This corresponds to the height position of a.

Therefore, the weight of the hanging member 13 suspended from the hook 15 and the insertion tube 11 acts on the weight detector 14. The weight detector 14 detects a change in the weight of the insertion tube 11 due to buoyancy, as will be described later, and transmits the detection signal to the weight signal converter control means 1.
Output to 6. The weight signal converter 16 also includes a weight setting section 16a that sets a predetermined value corresponding to a change in the weight of the insertion tube 11 that changes due to buoyancy, and a structure in which the detected weight of the insertion tube 11 is set by the weight setting section 16a. When the value is below the weight value, that is, the detection signal output from the weight detector 14 is output from the weight setting section 16a.
It has a signal oscillation section 16b that determines when a predetermined value set in advance is reached and outputs an overflow detection signal.

Next, the shipping operation in the shipping apparatus having the above configuration will be explained.

When shipping molten asphalt,
When the lorry vehicle 7 arrives at a predetermined position on the stage of the shipping device, the loading arm 8 is first rotated so that the insertion tube 11 faces the insertion opening 7b of the hatch 7a. Then, lower the insertion tube 11 and insert the insertion port 7.
Insert into the hatch 7a from b. Next, the amount of shipment to be loaded onto the lorry vehicle 7 is set in correspondence with the hatch capacity, and a predetermined value corresponding to the change in the weight of the insertion tube 11 is set in the weight signal converter 16.

After the above setting operation, a pump start signal is supplied from the loading control circuit 5 to the pump starter 17 in conjunction with the shipping start operation, and the pump 4 is started. Further, a valve opening signal is supplied from the loading control circuit 5 to the metering valve 6 to start shipping. For this reason, heater 2 allows approximately
Liquid asphalt heated to about 200°C is pumped by a pump 4 and is transferred to a hatch 7 via a pipe 3, a metering valve 6, a loading arm 8, and an insertion pipe 11.
Shipped within a.

Normally, after shipping starts, a shipping worker visually checks the liquid level or measures the flow rate using a flowmeter, and when a predetermined amount is shipped, the metering valve 6 is closed so that the liquid level comes into contact with the tip 11a of the insertion tube 11. Before that, the liquid supply to the lorry vehicle 7 is stopped.

However, if the shipping worker does not visually check the liquid level, or if the valve closing signal is not output and the metering valve 6 is not closed, the amount of liquid supplied exceeds the predetermined shipping amount. Sometimes. In this case, as the liquid level rises, the liquid level reaches the position of the tip 11a of the insertion tube 11, and the float 12
be in contact with When the liquid supply continues and the liquid level continues to rise, the float 12 is immersed in the liquid and the buoyancy of the float 12 acts on the insertion tube 11.

For this reason, the insertion tube 1 that was acting on the hook 15
1 is reduced by the buoyancy. Therefore, the weight detector 14 detects a change in the weight of the insertion tube 11 as the buoyancy of the float 12 acts on the insertion tube 11. A detection signal corresponding to a change in the weight of the insertion tube 11, which gradually decreases as the liquid level rises, is sequentially supplied from the weight detector 14 to the weight signal converter 16.

In the weight signal converter 16, the weight detector 14
When the signal output from the oscillator 16b reaches a preset value, an overflow detection signal is output from the signal oscillator 16b. When this overflow detection signal is supplied to the loading control circuit 5, the loading control circuit 5
outputs a valve closing signal to the metering valve 6 and also outputs a pump stop signal. Therefore, the pump 4 is stopped, the metering valve 6 is closed, and shipping to the lorry vehicle 7 is stopped. Therefore, the liquid supply is stopped before the liquid supplied into the hatch 7a overflows from the insertion port 7b, and overflow from the insertion port 7b is reliably prevented. Therefore, even if the shipping worker does not visually check the liquid level, or the valve close signal is not output after a predetermined amount has been shipped, shipping work heated to high temperatures can be carried out more safely. Accidents caused by overflow can be prevented.

In this way, in order to detect the weight of the insertion tube 11 inserted into the insertion opening 7b of the hatch 7a and prevent overflow, molten asphalt can enter and stick to the movable parts of, for example, a float-type device, causing malfunction. There is no risk of liquid level detection being interfered with by asphalt vapor, unlike in optical devices. Additionally, there is no inconvenience in installing signal wiring as with capacitance type devices.

Note that the setting of the liquid level detection position can be easily changed by changing the setting of the detected weight in the weight setting section 16a. Furthermore, in the above description, the signal oscillation unit 16
When the overflow detection signal is output from b, the metering valve 6 is closed to stop the liquid supply; however, for example, the output of the overflow detection signal may activate an alarm to notify the shipping worker. .

Effects of the invention As mentioned above, the shipping device according to the invention uses a weight detector to detect the weight of the insertion tube provided at the tip of the loading arm, and detects the buoyancy when the insertion tube is immersed in the liquid in the container. Since the liquid supply is stopped in response to the output signal from the weight detector corresponding to the change in the weight of the insertion tube, it is possible to reliably detect overflow when the liquid exceeds the capacity of the container. Even when controlling the shipping of molten asphalt that has been heated to High viscosity, high adhesion,
Since the liquid level and weight can be detected without being affected by asphalt vapor or the like, it is possible to reliably stop the liquid supply upon overflow detection and prevent the liquid from overflowing from the container. Therefore,
For example, if a shipping worker neglects to visually check the liquid level, or if a valve closing signal is not output after a predetermined amount has been shipped, the liquid supply can be stopped before overflow to ensure the safety of shipping operations. It has features such as being able to increase the liquid level even further, and also being able to easily detect the liquid level using a conventional loading arm.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of a shipping device according to the present invention, and FIG. 2 is a partially cutaway sectional view showing an enlarged main part of the present invention. 5... Loading control circuit, 6... Metering valve, 7... Lorry vehicle, 8... Loading arm, 9... Liquid level detection unit, 11... Insertion tube, 12... Float, 1
3... Hanging member, 14... Weight detector, 16...
Weight signal converter.

Claims (1)

[Claims for Utility Model Registration] (1) A device that fits loosely around the outer periphery of the tip of a loading arm and is displaceable in the vertical direction with respect to the loading arm, and when supplying liquid, the liquid is supplied to the tip of the loading arm. an insertion tube inserted into the liquid supply container as it moves to the mouth; a weight detector from which the insertion tube is suspended and attached to the loading arm to detect the weight of the insertion tube; Determining that the detection signal output from the weight detector has reached a preset value based on a weight change of the insertion tube due to buoyancy when the insertion tube is immersed in the liquid in the container. A shipping device comprising: a control means for outputting an overflow detection signal; and a liquid supply stop means for stopping liquid supply upon input of the overflow detection signal. (2) The utility model registration claim (1) characterized in that the liquid supply stop means is a metering valve that is provided in the flow path upstream of the loading arm and is closed by the input of the overflow detection signal. )
Shipping equipment as described in section. (3) The shipping device according to claim (1), wherein the liquid supply stop means is an alarm that notifies a shipping worker of a command to stop the liquid supply by inputting the overflow detection signal. .