JP6833282B2 - Cargo handling device and tank truck equipped with it - Google Patents

Description

The present invention relates to a cargo handling device for loading and unloading liquids from a tank of a tank lorry and a tank lorry including the same.

A tank truck is a vehicle that loads a liquid (for example, fuel oil such as gasoline, kerosene, or light oil) into a tank, transports it to a destination, and unloads it. Some tank trucks are equipped with a cargo handling device that pumps a liquid by pumping to supply (load) or discharge (unload) liquid to the tank. In some of these types of cargo handling devices, the unloading method can be switched between the pump unloading method and the gravity unloading method by a four-way valve (see Patent Document 1 and the like). The pump unloading method is a unloading method in which a pump is used to actively discharge the liquid from the tank, and the gravity unloading method is a unloading method in which the liquid is discharged from the tank using the liquid level difference (gravity).

Japanese Unexamined Patent Publication No. 2005-231698

The four-way valve used in the cargo handling device of the tank truck includes a tank pipe connected to the bottom valve provided at the bottom of the tank, a hose connection pipe connected to the on-off valve to which the refueling hose, etc. are connected, and a pump pipe connected to the pump. Be connected. The connection relationship of these pipes is switched by a four-way valve according to the work. Due to such a configuration, after the cargo handling work, the liquid may remain sealed in the piping from the bottom valve to the on-off valve in the cargo handling device.

Here, as a result of investigation by the inventors of the present application in relation to the recent climate warming tendency, if the situation where the tank truck is directly exposed to sunlight in the daytime such as summer, the piping of the cargo handling device is piped even if the cargo handling work is not performed. It was found that the pressure inside may increase. This is due to the expansion of the fluid (liquid, air, etc.) in the piping, and is considered to be a phenomenon that occurs when the liquid is sealed in the piping and is stagnant except during cargo handling work. In case the tendency of climate warming continues and the piping pressure rises further in the future, measures will be taken to prevent the liquid sealed in the piping of the cargo handling device from leaking from the joints of the piping due to the increase in piping pressure. I want to keep it.

An object of the present invention is to provide a cargo handling device capable of suppressing an increase in pipe pressure during non-load handling work and suppressing leakage of a liquid sealed in the pipe, and a tank truck provided with the same. is there.

In order to achieve the above object, the present invention presents a flow path switching valve for switching a liquid flow path, a bottom valve provided at the bottom of the tank, and suction in a cargo handling device for loading and unloading liquid to a tank of a tank hose. A pump for discharging the liquid, an on-off valve to which a hose for supplying or discharging the liquid is connected, a tank pipe for connecting the flow path switching valve and the bottom valve, the flow path switching valve and the pump. comprising a pump pipe connecting a hose connection pipe for connecting the flow channel switching valve and the on-off valve, before Symbol tank pipe, and a pressure regulator which is provided on one of the pipe of the pump pipe or the hose connecting pipe The pressure regulating device is configured to include a cylindrical hollow container located above the one pipe and a connecting pipe connecting the one pipe and the hollow container, and the hollow container is configured. It is characterized by being filled with air.

According to the present invention, it is possible to suppress an increase in pipe pressure while not performing cargo handling work and suppress leakage of the liquid sealed in the pipe.

It is a side view of the tank truck provided with the cargo handling apparatus which concerns on one Embodiment of this invention. It is a top view of the tank truck provided with the cargo handling device which concerns on one Embodiment of this invention. It is a rear view of the tank truck provided with the cargo handling device which concerns on one Embodiment of this invention. It is a schematic diagram of the circuit of the cargo handling apparatus which concerns on one Embodiment of this invention. It is a side view of one configuration example of the pressure regulating device provided in the cargo handling device according to one embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the line VI-VI in FIG. It is a side view of one configuration example of the pressure regulating device provided in the cargo handling device which concerns on one modification of this invention. It is a schematic diagram of the circuit of the cargo handling apparatus which concerns on other modification of this invention.

Embodiments of the present invention will be described below with reference to the drawings.

1. 1. Tank lorry FIG. 1 is a side view of a tank lorry provided with a cargo handling device according to an embodiment of the present invention, FIG. 2 is a plan view, and FIG. 3 is a rear view. In the specification of the present application, the left side, the right side, the lower side, and the upper side with respect to the tank truck 1 in FIG. 2 are the front side, the rear side, the left side, and the right side of the tank truck 1, respectively. The tank lorry 1 shown in FIGS. 1 to 3 includes a vehicle body 2 capable of traveling on its own and a tank 3 mounted on the vehicle body 2. In the present embodiment, the inside of the tank 3 is partitioned into a plurality of (three in this example) tank chambers 3a-3c (see FIG. 4). A hose winding device 6 is mounted between the tank 3 and the cab 4 on the vehicle body 2. The refueling hose 5 connected to the tank 3 is wound by the hose winding device 6. The refueling hose 5 is a hose for supplying the liquid in the tank 3 to the unloading destination. At the tip of the refueling hose 5, a refueling nozzle (not shown) for unloading (supplying) the liquid in the tank 3 is provided at a target unloading destination. Typical examples of the liquid to be loaded stored in the tank 3 are fuel oils such as gasoline, kerosene, and light oil.

2. 2. Cargo Handling Device FIG. 4 is a schematic diagram of a circuit of a cargo handling device according to an embodiment of the present invention. The cargo handling device shown in the figure is a device for loading and unloading liquid to the tank 3 of the tank truck 1. The cargo handling device includes a four-way valve 11, a pump 12, an on-off valve (discharge valve) 13a, 13b, a tank pipe (main pipe) 14, a pump pipe 15, a hose connection pipe (external conduction pipe) 16, a bottom valve 17a-17c, and a first. The pressure adjusting device 18 of 1 and the pressure adjusting device 19 of the second are provided. The four-way valve 11, the pump 12, the on-off valves 13a and 13b, the tank pipe 14, the pump pipe 15, the hose connection pipe 16 and the bottom valve 17a-17c form a liquid flow path through which the liquid flows. Further, the pump pipe 15 includes a suction pipe 15a and a discharge pipe 15b.

One end of the tank pipe 14 is connected to the four-way valve 11, and the other end is connected to the tank 3. The other side of the tank pipe 14 is branched into a plurality of (three in this example) branch pipes 14a-14c in this embodiment. The branch pipes 14a-14c are connected to the bottom valves 17a-17c, respectively. The bottom valves 17a-17c are on-off valves provided at the bottom of the tank chambers 3a-3c, respectively.

The hose connection pipe 16 has one end connected to the four-way valve 11 and the other end connected to the on-off valves 13a and 13b. In the present embodiment, the other side of the hose connection pipe 16 is branched into a plurality of (two in this example) branch pipes 16a and 16b, and the branch pipes 16a and 16b are connected to the on-off valves 13a and 13b, respectively. The on-off valves 13a and 13b are provided on the left and right sides of the vehicle body 2, and hoses (not shown) are connected during loading or unloading operations. That is, the on-off valve 13a or 13b is connected to an external facility such as an underground tank of a gas station via a hose. The refueling nozzle described above is connected to the hose connection pipe 16 via a hose or the like.

Of the pump pipe 15, the suction pipe 15a has one end connected to the four-way valve 11 and the other end connected to the suction port of the pump 12. The discharge pipe 15b has one end connected to the four-way valve 11 and the other end connected to the discharge port of the pump 12. The pump 12 is located below the four-way valve 11. The pump 12 is arranged below the tank 3 and is driven by a driving force taken out from a power take-off device (PTO) provided in an engine (not shown) of the vehicle body 2 to discharge and pump the sucked liquid. .. The suction pipe 15a and the discharge pipe 15b are connected by a relief pipe RP, and the relief pipe RP is provided with a relief valve RV that defines an upper limit value of the pipe pressure of the discharge pipe 15b. As a result, when the pipe pressure of the discharge pipe 15b reaches the upper limit value, the relief valve RV opens and the hydraulic oil escapes to the suction pipe 15a.

The four-way valve 11 is a flow path switching valve for switching the flow path of the liquid in the cargo handling device, and includes four ports. As described above, one port of the four-way valve 11 has a tank pipe 14, the other one port has a hose connection pipe 16, and the remaining two ports have a pump pipe 15 (suction pipe 15a and discharge pipe 15b). Is connected. The four-way valve is arranged below the tank 3 and above the pump 12, and is operated by a handle H (FIG. 1) provided on the side portion (left side in this example) of the vehicle body 2. The illustrated four-way valve 11 has a structure in which four positions can be switched. The first to third positions are positions in which the port to which the tank pipe 14 is connected is connected to only one of the other ports and the remaining two ports are connected to each other. For example, when the four-way valve 11 is switched to the first position, the tank pipe 14 is connected to the suction pipe 15a, and the discharge pipe 15b is connected to the hose connection pipe 16. Similarly, when the position is switched to the second position, the tank pipe 14 is connected to the hose connection pipe 16, and the discharge pipe 15b is connected to the suction pipe 15a. When the position is switched to the third position, the hose connection pipe 16 is connected to the suction pipe 15a, and the discharge pipe 15b is connected to the tank pipe 14. On the other hand, when the four-way valve 11 is switched to the fourth position, the tank pipe 14 is closed by the four-way valve 11. The four-way valve 11 is switched to the fourth position except during work.

When performing pump unloading work using a cargo handling device, first connect a hose (not shown) connected to the unloading destination such as an underground tank of a gas station to either one of the on-off valves 13a and 13b. Then, the four-way valve 11 is switched from the fourth position to the first position. Further, one or more of the bottom valves 17a-17c and the on-off valves 13a and 13b connected to the hose are opened to drive the pump 12. As a result, the liquid in the tank chamber with the bottom valve opened is sequentially supplied to the unloading destination via the tank pipe 14, the suction pipe 15a, the pump 12, the discharge pipe 15b, and the hose connection pipe 16. It is also possible to unload by the pump unloading method with the refueling nozzle described above without passing through the on-off valves 13a and 13b.

When performing gravity unloading work, connect a hose (not shown) to either the on-off valve 13a or 13b in the same way as pump unloading work, and switch the four-way valve 11 to the second position. .. Further, one or more of the bottom valves 17a-17c and the on-off valves 13a and 13b to which the hose is connected are opened. The pump 12 is stopped. As a result, the liquid in the tank chamber with the bottom valve opened flows out by its own weight, bypasses the suction pipe 15a, the pump 12 and the discharge pipe 15b, and is supplied to the unloading destination via the tank pipe 14 and the hose connection pipe 16. To. While the liquid level is high, it is possible to unload by gravity unloading with the above-mentioned refueling nozzle without passing through the on-off valves 13a and 13b.

When loading, for example, a hose (not shown) connected to a storage tank in a refinery or oil tank is connected to either the on-off valve 13a or 13b, and the four-way valve 11 is placed in the 4th to 3rd positions. Switch to. Further, one or more of the bottom valves 17a-17c and the on-off valves 13a and 13b connected to the hose are opened to drive the pump 12. As a result, the liquid in the storage tank is sucked out and loaded into the tank chamber in which the bottom valve is opened via the hose connection pipe 16, the suction pipe 15a, the pump 12, the discharge pipe 15b, and the tank pipe 14 in this order.

Except for the above cargo handling work (hereinafter referred to as non-loading work), the four-way valve 11 is switched to the fourth position, the tank pipe 14 is closed, and the supply and discharge of the liquid by the cargo handling device is cut off.

3. 3. Pressure regulator The first pressure regulator 18 is provided in the tank pipe 14. The second pressure adjusting device 19 may be provided in the pump pipe 15 (suction pipe 15a or discharge pipe 15b), but in the present embodiment, it is provided in the hose connection pipe 16. The first pressure adjusting device 18 and the second pressure adjusting device 19 have a role of absorbing the pressure increase of the tank pipe 14 and the hose connecting pipe 16 during non-load handling work, respectively. In the present embodiment, the tank pipe 14 has a branch on the other side with respect to one side connected to the four-way valve 11, but when there is no valve between the four-way valve 11 and the bottom valve 17a-17c, the flow of the tank pipe 14 The first pressure adjusting device 18 may be provided anywhere in the road. However, if there is one or more valves between the four-way valve 11 and the bottom valves 17a-17c and the tank piping 14 is separated into a plurality of closed sections by the valves during non-loading work, the locations where the tank piping 14 is closed. It is desirable to provide a first pressure adjusting device 18 in each of the above. The above matters concerning the first pressure adjusting device 18 can be said to be the same for the second pressure adjusting device 19.

FIG. 5 is a side view of a configuration example of the first pressure adjusting device 18, and FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. Although the first pressure adjusting device 18 is illustrated in these figures, the second pressure adjusting device 19 has the same configuration as the first pressure adjusting device 18. Therefore, regarding the explanation of the second pressure adjusting device 19, the "first pressure adjusting device 18" in the explanation of the first pressure adjusting device 18 is referred to as the "second pressure adjusting device 19" and the "tank pipe 14". Is read as "hose connection pipe 16 or pump pipe 15", and reference numerals are given in FIGS. 5 and 6 in parentheses to omit the description.

The first pressure adjusting device 18 includes a hollow container 21 and a connecting pipe 22. The hollow container 21 is, for example, a hollow steel tubular member (cylindrical shape in this example) and extends along the tank pipe 14 (the center lines of the hollow container 21 and the tank pipe 14 are parallel or nearly parallel). ). The tank pipe 14 is bent as appropriate, but "the hollow container 21 extends along the tank pipe 14" means that the hollow container 21 is installed in the first pressure adjusting device 18 in the path of the tank pipe 14. It means that it is in line. Further, the hollow container 21 has a closed structure except for the connecting portion of the connecting pipe 22. The cross-sectional area and length of the hollow portion of the hollow container 21 are set so as to secure a desired internal volume. It is desirable that the desired internal volume is set to be larger than, for example, the volume increase of the liquid that can be sealed in the tank pipe 14 during the daytime in summer. However, if a single hollow container 21 cannot secure a desired volume due to the layout of the tank pipe 14, a plurality of first pressure adjusting devices 18 are set, and the total of each hollow container 21 is used to obtain a desired volume. You just have to secure it. Further, it is desirable that the hollow container 21 is installed so as to be higher than the tank pipe 14 (above the tank pipe 14). “The hollow container 21 is higher than the tank pipe 14” means that the internal space of the hollow container 21 is at least partially higher than the installation portion of the first pressure regulating device 18 in the path of the tank pipe 14. It shall mean that there is. This prevents the liquid from inadvertently flowing into the hollow container 21.

The internal space of the hollow container 21 is connected to the internal space (liquid flow path) of the tank pipe 14 via a hollow connecting pipe 22. The connecting pipe 22 also serves as a support member for the hollow container 21 with respect to the tank pipe 14. The design of the connecting pipe 22 can be arbitrarily changed within the range allowed by the layout of the tank pipe 14 as long as the strength and airtightness can be ensured. In the present embodiment, the connecting pipe 22 is composed of a socket 23 attached to the tank pipe 14 and fixed by welding, and a nipple 24 attached to the hollow container 21 and fixed by welding. For example, the first pressure adjusting device 18 is fixed to the tank pipe 14 by inserting the nipple 24 wrapped with sealing tape into the socket 23, turning the hollow container 21 and screwing it in.

4. Effect (1) Liquid leakage suppression-1
When the liquid is stored in the tank 3, the inside of the tank pipe 14 is usually filled with the liquid, and the hollow container 21 of the first pressure adjusting device 18 and the second pressure adjusting device 19 is empty (filled with air). Has been). When the piping pressure of the cargo handling device rises and the fluid (liquid, air) enclosed in the piping expands, the volume increase of the fluid is transferred to the hollow containers 21 of the first pressure regulating device 18 and the second pressure regulating device 19. Accepted. As a result, it is possible to suppress an increase in the pipe pressure of the cargo handling device and suppress liquid leakage from the joints of the pipes and the like.

(2) Liquid leakage suppression-2
During non-loading work, the four-way valve 11 is in the fourth position, the tank pipe 14 is separated from other pipes, and liquid flows into the flow path in the area partitioned by the valve body of the four-way valve 11 and the valve body of the bottom valve 17a-17c. Can be enclosed. In the present embodiment, even if the fluid in this area expands, it can be absorbed by the first pressure regulating device 18 and the increase in piping pressure can be suppressed. In addition, since the on-off valves 13a and 13b are also closed during non-load handling work, the area partitioned by the valve body of the four-way valve 11 including the pump pipe 15 and the hose connecting pipe 16 and the valve body of the on-off valves 13a and 13b. The flow path can also be filled with liquid. The expansion of the fluid in this area is absorbed by the second pressure regulating device 19, and the increase in the piping pressure can be suppressed.

(3) Both pressure regulation performance and simplicity, etc. By extending the hollow container 21 along the piping, it is possible to secure a large volume of the hollow container 21 while flexibly adapting to the layout of the piping. As a result, the first pressure adjusting device 18 and the second pressure adjusting device 19 obtain sufficient pressure adjusting performance to suppress the pressure rise of the pipe, and the narrow lower part of the vehicle body 2 where various devices are arranged. It fits in the space and can be installed comfortably. Further, since the first pressure adjusting device 18 and the second pressure adjusting device 19 have a simple structure in which a simple tubular hollow container 21 having no moving parts is connected to a pipe by a connecting pipe 22, it is of course a new car. It can be easily applied to tank trucks after delivery. The first pressure adjusting device 18 and the second pressure adjusting device 19 can secure a desired volume of the hollow container 21 with one or a small number, and the number of installations can be suppressed, which also contributes to facilitation of application. Further, since the first pressure adjusting device 18 and the second pressure adjusting device 19 are installed along the piping, they are inconspicuous and the aesthetic appearance of the tank truck, which is a product, is not impaired.

Further, the hose connection pipe 16 is a pipe that serves as an interface for connecting a hose to be connected to an external device, and is easier to reach from the outside than, for example, a pump pipe 15. When the four-way valve 11 is in the fourth position, the hose connection pipe 16 and the pump pipe 15 are connected, so that the second pressure adjusting device 19 can be installed in the pump pipe 15, but the second pressure adjusting device is connected to the hose connecting pipe 16. By installing the device 19, there is an advantage that maintenance is easy. The pump pipe 15 is protected by a relief valve RV, and since the relief valve RV needs to be installed, there is no room for space. In terms of these aspects as well, the hose connection pipe 16 is preferable as the installation position of the second pressure regulating device 19.

5. Modification Example FIG. 7 is a side view of a configuration example of a pressure regulating device provided in a cargo handling device according to a modification of the present invention. The same parts as those in the previous embodiment are designated by the same reference numerals as those in the above-described drawings in FIG. 7, and the description thereof will be omitted. The difference between this example and the above embodiment is that the pressure regulating device is installed in the four-way valve 11 instead of the piping. Since the four-way valve 11 also constitutes a liquid flow path, it functions effectively if a pressure regulating device can be installed, and in that case, the liquid leakage suppressing effect can be obtained as in the above embodiment.

Generally, the valve box (body) of a four-way valve has a drain outlet for connecting a drain pipe, but in the four-way valve 11 assembled to a tank truck, the drain outlet is not used and is often blocked by a plug. .. In this example, the four-way valve 11 is installed so that the drain discharge port 11a faces upward, and the drain discharge port 11a is used in place of the socket 23 shown in FIG. 5 or the like to use the first pressure regulating device 18 or the second pressure adjusting device 18. The pressure adjusting device 19 is installed. Whether to install the first pressure adjusting device 18 or the second pressure adjusting device 19 at the drain discharge port 11a depends on the valve body (not shown) of the four-way valve 11 and the drain during non-load handling work (fourth position). It depends on the positional relationship with the discharge port 11a. When the valve body in the 4th position separates the port to which the tank pipe 14 is connected from the other 3 ports, the drain discharge port 11a is closer to the tank pipe 14 than the valve body in the 4th position. A first pressure adjusting device 18 can be installed at the drain discharge port 11a. If the drain discharge port 11a is located farther from the tank pipe 14 than the valve body at the fourth position, the second pressure regulating device 19 can be installed at the drain discharge port 11a.

In the case of this example, since the structure utilizes the drain discharge port 11a originally existing in the four-way valve 11, there is no additional processing of the pipe such as drilling or welding. Therefore, the installation of the first pressure adjusting device 18 or the second pressure adjusting device 19 is easier, and the effect of improving the soundness of the system can be expected as the number of processed parts of the piping is reduced.

In this example, an example in which the pressure regulating device is installed in the four-way valve 11 has been described. For example, if the body of the bottom valve 17a-17c has an opening corresponding to the drain discharge port 11a, the first pressure regulating device 18 Can also be installed on one or more of the bottom valves 17a-17c. In that case, the bottom valve 17a-17c is installed so that the opening is closer to the tank pipe 14 than the closed valve body. Similarly, depending on the configuration of the on-off valves 13a and 13b, the second pressure regulating device 19 can be installed on at least one of the on-off valves 13a and 13b in the same manner.

FIG. 8 is a schematic diagram of a circuit of a cargo handling device according to another modification of the present invention, and is a diagram corresponding to FIG. The same parts as those in the above-described embodiment are designated by the same reference numerals as those in the above-described drawings in FIG. The difference of this example from the above embodiment is that a three-way valve 25 and a flow meter 26 are added.

In this example, the hose connection pipe 16 and the discharge pipe 15b are connected by bypassing the four-way valve 11 by the bypass pipe 27. The three-way valve 25 is provided in the middle of the hose connection pipe 16 (upstream portion of the branch pipes 16a and 16b), and the bypass pipe 27 is connected to the hose connection pipe 16 via the three-way valve 25. For convenience of explanation, among the hose connection pipes 16 connected to the three-way valve 25, the pipes connected to the four-way valve 11 are referred to as the first pipe 16c, and the pipes connected to the branch pipes 16a and 16b are referred to as the second pipe 16d. That is, of the three ports of the three-way valve 25, the first pipe 16c is connected to the first port, the second pipe 16d is connected to the second port, and the bypass pipe 27 is connected to the third port. The three-way valve 25 is a valve for switching the connection destination of the second pipe 16d, and either the first pipe 16c or the bypass pipe 27 is selectively connected to the second pipe 16d by the three-way valve 25. The flow meter 26 is installed in the bypass pipe 27 and measures the flow rate of the liquid flowing through the bypass pipe 27. The value measured by the flow meter 26 can be confirmed by an indicator (indicator) provided at an appropriate place such as the outside of the tank truck 1.

In this modification, the first pressure regulating device 18 can be provided at at least one place in the liquid flow path composed of the tank pipe 14, the bottom valve 17a-17c, and the four-way valve 11. Further, the second pressure regulating device 19 can be provided at least one of the liquid flow paths including the hose connecting pipe 16, the pump pipe 15, the on-off valves 13a and 13b, the four-way valve 11 and the three-way valve 25. The configurations of the first pressure adjusting device 18 and the second pressure adjusting device 19 can be the same as those exemplified above. Other configurations This modification is the same as that illustrated above.

In this example, by operating the four-way valve 11 or the like with the first pipe 16c and the second pipe 16d connected by the three-way valve 25, the tank pipe 14 is closed and closed in the same manner as in the example described above. You can perform loading work, gravity unloading method unloading work, and pump unloading method unloading work. In addition, when the three-way valve 25 is operated to connect the second pipe 16d to the bypass pipe line 27, the three-way valve 25 cuts off between the first pipe 16c and the second pipe 16d. When the unloading work of the pump unloading method is performed in this state, the liquid discharged from the pump 12 flows to the bypass pipe 27, bypasses the four-way valve 11 and is supplied to the second pipe 16d, for example, the refueling hose 5 (FIG. 1). ) Can be supplied to the unloading destination. The flow rate flowing through the bypass pipe 27 is measured by the flow meter 26 and can be confirmed by an indicator, which is convenient when selling a liquid (kerosene or the like) by weight.

The first pressure adjusting device 18 and the second pressure adjusting device 19 can be suitably applied to a tank truck having a circuit configuration as in this modification, and have the same effect.

6. Other configurations of the first pressure regulating device 18 and the second pressure regulating device 19 are not limited to the configurations exemplified above. As long as the above effect (1), which is the basic effect, is obtained, it is sufficient to provide a container in which the piping and the internal space are connected. For example, the pressure regulating device can be configured by a tubular container extending in a direction orthogonal to the pipe. Further, although the advantages of the simple structure and space saving are lost, if only the above effect (1) is sufficient, a device having a movable element having a pressure adjusting function such as an accumulator can be used as the pressure adjusting device. ..

Further, in the above description, the case where the pressure adjusting device is installed in both the tank pipe 14 and the hose connecting pipe 16 has been described as an example, but the above effect (1) can be obtained only by the first pressure adjusting device 18. , The second pressure adjusting device 19 may be omitted.

Further, the case where the invention is applied to a tank truck using a four-way valve 11 as a flow path switching valve has been described as an example, but the piping route changes due to the addition of equipment, for example, a five-way valve or the like is used instead of the four-way valve. It cannot be said that there will be no major design changes in the future. The basic effect (1) of the present invention is applicable even if the four-way valve is replaced with another flow path switching valve, as long as there is a common problem, and the same effect can be exhibited.

1 ... Tank lorry 3 ... Tank 11 ... Four-way valve (flow path switching valve)
12 ... Pumps 13a, 13b ... On-off valve 14 ... Tank piping 15 ... Pump piping 16 ... Hose connection piping 17a-17c ... Bottom valve 18 ... First pressure regulating device 19 ... Second pressure regulating device 21 ... Hollow container 22 ... Contact pipe

Claims (6)

In a cargo handling device that loads and unloads liquids from tank trucks
A flow path switching valve that switches the liquid flow path,
A bottom valve provided at the bottom of the tank and
A pump that discharges the inhaled liquid and
An on-off valve to which a hose for supplying or discharging liquid is connected,
The tank piping connecting the flow path switching valve and the bottom valve,
The flow path switching valve, the pump piping connecting the pump, and
A hose connection pipe connecting the flow path switching valve and the on-off valve,
It is provided with a first pressure adjusting device provided in the tank pipe .
The first pressure adjusting device is configured to include a cylindrical hollow container located above the tank pipe and a connecting pipe connecting the tank pipe and the hollow container.
A tank lorry cargo handling device, characterized in that the hollow container is filled with air. The cargo handling device for a tank truck according to claim 1, wherein the hollow container extends along the tank pipe. The cargo handling device for a tank truck according to claim 1 or 2, wherein the connecting pipe is screwed into and attached to the tank pipe. A cargo handling device for a tank truck according to any one of claims 1-3, comprising a second pressure adjusting device provided in the pump pipe or the hose connecting pipe. In a cargo handling device that loads and unloads liquids from tank trucks
A flow path switching valve that switches the liquid flow path,
A bottom valve provided at the bottom of the tank and
A pump that discharges the inhaled liquid and
An on-off valve to which a hose for supplying or discharging liquid is connected,
The tank piping connecting the flow path switching valve and the bottom valve,
The flow path switching valve, the pump piping connecting the pump, and
A hose connection pipe connecting the flow path switching valve and the on-off valve,
It is provided with a pressure regulator provided in one of the pump pipes or the hose connection pipes.
The pressure regulating device is configured to include a cylindrical hollow container located above the one pipe and a connecting pipe connecting the one pipe and the hollow container.
The hollow container is filled with air
A tank lorry cargo handling device characterized by this. Vehicle, tank truck, characterized in that with either one handling device of the tank is placed on the vehicle body, and the claims 1- 5.

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