JPH0123009Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a bottom valve operating device for a tank truck.

First, we will discuss its technical background.

The bottom valves provided in each tank compartment of a tank truck are operated not only when discharging the fuel oil in each tank compartment, but also during reverse pumping and filling. Such draining and filling can be carried out by monitoring the progress of draining and filling inside through the manhole window attached to the canopy of each tank compartment, or by checking the capacity with a scale installed at the top of the tank before draining. It was carried out with If the bottom valve operation part is located not only at the bottom of the tank or only at the top, as is conventionally the case, but at both the top and bottom of the tank, the person monitoring the top of the tank must check the bottom of the bottom of the tank. The monitor can operate the bottom valve by himself without contacting the person in charge of valve operation, and the bottom valve operator does not have to go up and down the tank every time to monitor and operate the bottom valve. suitable.

However, simply having a bottom valve operating section installed at both the upper and lower parts of the tank is still insufficient. In other words, for example, it is possible to open the bottom valve at the top of the tank, then go down to the ground and close the bottom valve at the bottom of the tank, in other words, the operation of the other bottom valve operating part is restricted from the top or bottom of the tank. Unless it is possible to independently perform arbitrary operations, it is inconvenient and useless in practice.

The above is the technical background.

Next, conventional technology will be described.

Therefore, a bottom valve operating device has been developed which is configured to enable the above-mentioned unique bottom valve operation using fluid pressure.

First, FIG. 1 is an overall explanatory diagram of a tank truck incorporating such a bottom valve operating device. In the figure, 1 is the tank body, 2,... are partition plates for configuring tank compartments, 3,... are manhole windows provided in the canopy of each tank compartment, 4,... are bottom valves of each tank compartment,
5 is a bottom valve operating valve on the lower side of the tank, 6 is a bottom valve operating valve on the upper side of the tank, and 7,... are cylinder parts (fluid Reference numeral 8 indicates piping of the fluid circuit described above, reference numeral 9 indicates a discharge valve, reference numeral 10 indicates an emergency lever, and reference numeral 11 indicates an emergency release device disposed in front of the emergency lever 10.

FIG. 2 is a piping circuit diagram of this type of bottom valve operating device that has been developed in the past. In this bottom valve operating device, the bottom valve operating valves 5 and 6 are of a type that automatically returns to the neutral position when released from the three positions. Also, in the figure, bottom valve 4
Although air is used as the operating fluid, the present invention is not limited to this, and hydraulic pressure may also be used.

In the figure, 12 is a compressor, 13 is an air tank, and 14, . . . are fluid pressure notification devices, and these fluid pressure notification devices 14, . , the pressure in the circuit is sensed and a display device such as a buzzer or lamp is used to notify the opening or closing of the bottom valve 4.
As mentioned above, in the case of the bottom valve operating valves 5 and 6, the fluid is cut off at the neutral A position, the fluid is supplied to the rear circuit through the piping 8 connected to the cylinder part 7 at the B position, and the fluid is supplied to the rear circuit through the piping 8 connected to the cylinder section 7, and at the C position. The fluid in this rear circuit is then discharged to the outside.
The rear circuits of the bottom valve operation valves 5 and 6 on the upper and lower sides of the tank are connected to each other, and are connected to the cylinder portion 7 on one side, and further branched on the other side to connect to the emergency valve 17. It is connected to the.
10 is an emergency lever connected to the operating wire 18 of the emergency valve 17, and 19 is an automatic closing device interposed in the middle of the wire 18.

Now, since the conventional bottom valve operating device of this type has the above-mentioned configuration, even if the bottom valve operating valves 5 and 6 on either side of the upper or lower part of the tank are operated, the circuit will automatically be activated when the user releases the hand. When shut off, it returns to the neutral A position where no fluid is injected or released. Therefore, when operating the other bottom valve operation valve 5, 6 after the fact, even if the circuits of both are in communication with each other, the operation can be independently performed without being hindered or restricted by the previous operation. be able to do it. As described above, the conventional bottom valve operating device of this type has the advantage of being convenient in practice and improving work efficiency.

The conventional technology is as described above.

Next, we will discuss the problems that the present invention attempts to solve.

However, the following problems have been pointed out with the conventionally developed bottom valve operating device shown in FIG.

In other words, when the tank truck is running, the bottom valve 4
is closed, and the circuit formed by the piping 8 between the cylinder portion 7, which is a fluid operating device for operating the bottom valve 4, and the bottom valve operating valves 5 and 6 is in a sealed state.
That is, when the bottom valve operation valves 5 and 6 are closed, the air in the air circuit behind them is released, but when they return to the neutral position, this air circuit is configured to be sealed. ing. Therefore, when the piping 8 of this air circuit is exposed to direct sunlight during summer, etc., this circuit is heated and the air inside expands.
There is a risk that the pressure will rise and force the operating cylinder part 7 of the bottom valve 4 to open the bottom valve 4. Furthermore, if high-pressure gas is trapped in the circuit, repairs, It is also dangerous as it may cause an unexpected accident during inspection.

In this way, in the case of the conventional bottom valve operation device, the fluid remains in a part of the circuit formed by the piping 8 without being released, which may cause an unexpected accident, resulting in a lack of safety. There was a problem.

This point was pointed out in the conventional example.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to propose a bottom valve operating device for a tank truck that solves the above-mentioned conventional problems.

The technical means of the present invention to achieve this objective are as follows.

This bottom valve operating device includes bottom valve operating valves for operating the bottom valves of each tank compartment using fluid pressure at the upper and lower parts of a tank divided into a plurality of chambers. The bottom valve operating valve is of a type that returns to the neutral position and closes when released from the three positions.

The rear circuits of the pair of bottom valve operating valves provided at the upper and lower parts of the tank for one bottom valve are connected to a fluid operating device for operating the bottom valve after merging, and are connected to a fluid operating device for operating the bottom valve. It is provided in communication with the low pressure section via a pressure-operated valve that is closed in the above manner.

The bottom valve operating device for a tank truck according to the present invention is comprised of such means and operates as follows.

When discharging and filling fuel oil, when the bottom valve operating valve at either the top or bottom of the tank is operated, the fluid pressure in the circuit behind it operates, causing the fluid operating device to operate and operate the bottom valve in the tank compartment. is opened/closed.

When the bottom valve operating valve is released, it returns to the neutral position and the operating fluid is cut off. After the fact, the other bottom valve operating valve with which the rear circuit has been merged can independently and arbitrarily open and close the bottom valve without being restricted by the previous one operation.

Now, regarding the bottom valve operating device of the present invention,
The circuit behind the bottom valve operation valve is communicated with the low pressure section via a pressure operation valve that closes when the pressure exceeds a predetermined pressure. In other words, except when the bottom valve is open at a predetermined pressure or higher, when the bottom valve is closed before the predetermined pressure is reached, the pressure-operated valve is open and the rear side The circuit is open to low pressure, such as the atmosphere.

Therefore, even if the rear circuit is subsequently heated by direct sunlight or the like and the fluid inside expands and becomes high pressure, the high pressure fluid is immediately released to a low pressure region such as the atmosphere through the open pressure operated valve. This prevents pressure from being inadvertently accumulated inside the rear circuit, and also prevents the fluid operating device from inadvertently operating and causing the bottom valve to open.

The above is an explanation of the effect.

The present invention will be explained below based on examples.

First, its configuration etc. will be explained.

Regarding the bottom valve operating device according to the present invention, explanations of the configurations and the like that are common to those explained in the prior art shown in FIGS. 1 and 2 will be omitted.

First, the piping circuit of the present invention will be explained. FIG. 3 is a piping circuit diagram of an embodiment of the bottom valve operating device according to the present invention.

For each bottom valve operating valve 5, 6, each branch passage 100 attached to the back side circuit by the piping 8 is closed when the pressure in the back side circuit of each bottom valve operating valve 5, 6 is equal to or higher than a predetermined pressure. Via the pressure operated valve 101,
It is provided in communication with a low pressure section (in the case of air, it refers to the atmosphere or the suction path of a compressor, etc., and in the case of hydraulic pressure, it refers to a low pressure circuit such as a return pipe), and functions to release the internal pressure.

That is, each branch passage 100 is attached to the piping 8 of each rear side circuit, and pressure-operated valves 101, . The pressure-operated valves 101, . . . close when the pressure in the branch passage 100 is equal to or higher than a predetermined pressure. As a result, the branch passage 100 remains open while communicating with the low pressure section except when any of the bottom valves 4 is open.

Next, the functions of the bottom valve operating valves 5 and 6 described above will be explained with reference to FIG. 4, which is a cross-sectional view of the valve portion thereof, and FIG. 5, which is a cross-sectional view of the automatic return device thereof.

The three-way pipe joint 16 in FIG. 4 includes an opening 217 for connection to the air tank 13 side and an opening 21 for connection to the circuit behind the bottom valve operating valves 5 and 6.
8. Opening holes 219 are provided on the atmospheric side for connection, and the valve body 20 is provided with a connecting bending passage 21 and a hand rod 22. The hand rod 22 is represented by a solid line and the communication passage 2
The A position is a neutral position where 1 does not communicate with any of the holes, and when the hand rod 22 rotates to the right, the B position is where the holes 217 and 218 are connected. When 22 is rotated to the left, it becomes the C position in which the apertures 218 and 219 are in communication.

In the figure, reference numeral 23 denotes a piston rod in an automatic return device which is pivotally fixed to the hand rod 22 via a turnbuckle 24, and as will be described later, a force acts on this to return the hand rod 22 from the B or C position to the A position. Automatic recovery is now possible.

In FIG. 5, reference numeral 25 denotes a cylinder body whose end is pivotally fixed to a mounting base 26. This is divided into two chambers by a small diameter part 27 in the center, and there are two chambers on both sides of this small diameter part 27. Large-diameter seat plates 28 and 29 are pressed against each other by plucked strips 30 and 31, respectively. The piston rod 23 inserted into the cylinder body 25 passes through a through hole 32 formed in the seat plate 29, and its tip is connected to the small diameter portion 23.
7 and a head 3 having a diameter smaller than that of the through hole 32 and larger in diameter than the through hole 32.
3, abuts against the seat plate 28 and is locked to the seat plate 29.

The illustrated embodiment in which the head 33 is located in the small diameter portion 27 is the equilibrium point between the two plucked strips 30, 31, and this corresponds to the above-mentioned A position. The position corresponding to the above-mentioned B or C position is a mode in which the piston rod 23 is moved against the plucked bar 31 or the plucked bar 30, but in both cases, by releasing the hand bar 22, the plucking bar 23 is moved. 31 or the release of the stored force of the plectrum 30 causes it to be pushed back toward the A position. In other words, automatic recovery is performed.

Next, the emergency release device 11 will be explained with reference to FIG.

This is made by attaching a stopper 43 made of a material that melts when it reaches a predetermined temperature to the opening of a branch pipe section 41 attached in front of the emergency valve 17.
A plug body 43 formed in a plate shape is attached to the open hole step portion 42 by pressing it with a cylindrical cap screw 44. The above-mentioned emergency lever 10 can close each bottom valve 4 at the same time at a position apart from the discharge valve 9 in the event of a fire during refueling as described later.
The bottom valve 4 can be automatically closed when workers cannot approach due to a fire.

Next, the mechanism of the bottom valve 4 to which the cylinder portion 7 is attached will be explained with reference to FIG.

The figure shows an example in which the cylinder part 7 is installed inside a tank, and 46 in the figure is an opening provided at the bottom of each tank compartment, to which a flange part 47 is welded, and to which the discharge valve is attached. An intervening pipe joint 48 for communicating with the piping extending up to 9 is flange-connected. The diameter of the pipe joint 48 is set smaller than that of the opening 46, and it protrudes slightly to serve as a valve seat. It is in contact.

The cylinder portion 7 has a piston rod tip fixed to the valve body 49, and is provided to move the valve body 49 in the valve opening direction using fluid pressure against the aforementioned urging force. That is, a dish-shaped pedestal 50 is fixed to the flange portion 58 of the pipe joint 48, and the cylinder portion 7 is placed on top of the dish-shaped pedestal 50. In the figure, 51 is a strip for pressing and urging the valve body inserted between the top plate of the pedestal 50 and the valve body 49, 52 is a communication hole drilled in the side wall of the pedestal 50, 53 is a piston, and 54 is a The piston rod 55 is a communication hole provided through the piston rod 54, and this communication hole 55 guides the pressure inside the pipe joint 48 to the upper surface of the piston 53 when filling the tank compartment from the pipe joint 48 with a pump. hand,
This balances the pressure applied to the valve body 49.

The piping 8 is connected to the lower part of the cylinder part 7, and fluid is forced into the lower side of the piston 53 to raise the piston rod 54 and open the valve body 49. Note that the fluid operating device is not limited to the illustrated cylinder type, but may also use a diaphragm type, for example.

Next, the pressure operated valve 101 will be explained with reference to FIG.

The cylinder body 117 is provided with a connecting hole 118, which connects one side to the aforementioned branch path 100.
and connect the other end to the piston described later. Furthermore, the connection hole 118 has a chamber 119 and a valve seat 1 on the upper end surface.
Ventilation hole 12 bored in catch seat 121 provided with 20
This also applies to 2. Note that such a connection hole 118
The communication hole 126 between the chamber 119 and the chamber 119 is as shown in the figure.
The opening area of the vent hole 122 is set to be extremely small.

Piston 1 constantly urged upward by bullet 123
A valve body 125 is formed at the lower end of the valve body 24 . The biasing force of this bullet 123 exceeds the pressure when the rear circuit such as the branch passage 100 of the bottom valve operating valves 5 and 6 does not reach a predetermined pressure, and when it exceeds the predetermined pressure, the biasing force exceeds the pressure. It is set to be inferior to the pressure.

In other words, when the rear circuit does not reach a predetermined pressure, the piston 124 moves toward the elastic material 1 as shown in the figure.
The valve is opened by being pushed up by the biasing force of 23, and the air in the rear circuit, that is, the branch path 100 and the piping 8 is discharged to the atmosphere from the ventilation hole 122 through the connection hole 118, the communication hole 126, and the chamber 119.

Now, the amount of air passing through the communication hole 126 is very small. Therefore, the pressure in the illustrated piston upper chamber 127 rises and falls in proportion to the pressure in the circuit behind the bottom valve operating valves 5 and 6, while the pressure in the chamber 119 is lower than that in the communication hole 126. Since the opening area of the vent hole 122 is set to be extremely large, no pressure is accumulated and the pressure does not increase.

Therefore, when the pressure in the circuit behind the bottom valve operating valves 5 and 6, that is, in the branch passage 100 and the piping 8 rises above a predetermined pressure, the piston 124 releases the elastic material 123 due to the pressure increase in the piston upper chamber 127. The valve body 125 is pushed down against the biasing force, and the valve body 125 is pushed down against the valve seat 120.
The valve closes when it comes into contact with the branch path 100, which had been in an open state until then.

Next, the automatic closing device 19 will be explained with reference to FIG.

In the figure, 59 is a cylinder case, and 60 is a rod that passes through the cylinder case 59, connects one end to the wire 18 connected to the emergency valve 17, and has the other end pivoted to the emergency lever 10. 61 is the rod 6
A cylindrical piston 63 that penetrates through the emergency lever 10 and is integrated with the piston at a welded portion 62 is a spring that biases the piston 61 in the operating direction of the emergency lever 10. Reference numeral 64 denotes a stopper whose tip end is fitted into a locking recess 61' shaped in the piston 61.
It is received and mounted by a set screw 67 via a fuse 66 that melts at a predetermined temperature. 68 is a mounting base for the cylinder case 59.

With the configuration described above, when the fuse 66 melts under the predetermined temperature atmosphere, the stopper 64 falls and disengages the piston 61.
is forcibly moved in the biasing direction of the spring 63. In this way, the emergency lever 10 is actuated to open the emergency valve 17.

Next, the emergency valve 17 will be explained with reference to FIGS. 10, 11, and 12a and 12b.

The emergency valve 17 is provided with a cylinder 230 with one end open, and a rotating body 231 that rotates inside the cylinder 230 while coming into contact with the inner periphery of the cylinder 230. A lever 232 is fixed to the rotating body 231, and the rotating body 231 is configured to rotate as the lever 232 rotates. Further, holes a, b, and c are inserted into the rotating body 231 from the outer periphery of the cylinder 231 toward the center of rotation of the rotating body 231.
A hole d, which communicates with the matching portion of holes a, b, and c, passes through the cylinder 230 from the center of the bottom surface of the cylinder 230 and communicates with the holes a, b, and c. It is provided in Note that 233 is a color. Holes a, b, and c correspond to ports a, b, and c in FIG. 2, and hole d is an opening for opening to the atmosphere.

Therefore, as shown in FIG. 12a, when the lever 232 is rotated to align the holes a, b, c of the cylinder 230 with the holes a, b, c of the rotating body 231, the holes a, b, c communicates with hole d. This state is an emergency road opening state. Further, as shown in FIG. 12b, if the lever 232 is rotated from the above position so that the holes a, b, c of the cylinder 230 do not communicate with the holes a, b, c of the rotating body 231, the port a , b, and c do not communicate with the atmosphere, and this state is an emergency route closure state. With this simple configuration, the bottom valve 4 can be closed by operating one lever 232 in an emergency, and the emergency valve 17 can be connected to multiple small-diameter pipes, so that the emergency valve 4 can be closed at the rear of the tank. When the valve 17 is positioned, the piping only needs to be extended in one direction, which requires less material and reduces piping man-hours.

The emergency valve 17 is configured like this.

The above is the explanation of the configuration, etc.

The operation etc. will be explained below.

In this bottom valve operation device, when discharging and filling fuel oil, either the bottom valve operation valve 5 or 6 at the upper or lower part of the tank is operated.
Then, the circuit behind it, that is, the piping 8 and the branch path 1
The pressure of the fluid 00 changes, and the cylinder section 7, which is a fluid operating device, operates, and the bottom valve 4 of the tank compartment is opened and closed (see FIGS. 1, 3, and 7).

When the bottom valve operating valve 5 or 6 is released, it returns to the neutral position and the operating fluid is cut off (see FIGS. 4 and 5). Afterwards, the other bottom valve operating valve 5 or 6 with which the rear circuit has been merged can independently and arbitrarily operate without being restricted by the operation of the preceding bottom valve operating valve 5 or 6. The bottom valve 4 can be opened and closed (see FIGS. 1 and 3).

Now, in this bottom valve operating device, the piping 8 and the branch passage 100, which are the circuits behind the bottom valve operating valves 5 and 6, are connected via a pressure operating valve 101 that closes at a predetermined pressure or higher. It is connected to a low pressure area such as the atmosphere.

That is, when the bottom valve operating valves 5 and 6 are open and the pressure in the circuit behind them is higher than a predetermined pressure, and the bottom valve 4 is open, the pressure operating valve 101 is closed. On the other hand, when the bottom valve operating valves 5 and 6 are closed and the circuit behind them does not reach the predetermined pressure and the bottom valve 4 is closed, the pressure operating valve 101
is open, and the rear circuit is open to a low pressure region such as the atmosphere (see Figures 3 and 8).

Therefore, even if the piping 8 and the branch 100, which are the back side circuit, are heated by direct sunlight etc. and the fluid inside expands and becomes high pressure, the high pressure fluid is passed through the open pressure operated valve 101, Immediately released into low pressure areas such as the atmosphere.

There is no possibility that pressure will inadvertently accumulate inside the rear circuit and the pressure will rise, and the cylinder part 7, which is a fluid operating device, will not inadvertently operate and the bottom valve 4 will open. is also reliably prevented.

The above is the explanation of the operation, etc.

As explained above, according to the bottom valve operating device for a tank truck according to the present invention, it is possible to independently open and close the bottom valve either on the top of the tank or on the ground, which not only improves work efficiency but also improves the bottom valve operating device. Pressure will not be inadvertently accumulated inside the circuit behind the valve operating valve, and unnecessary pressure within the circuit that may pose various dangers will be automatically released. Therefore, the bottom valve does not open inadvertently, and the occurrence of unexpected accidents during repairs and inspections is also prevented, making it extremely safe in terms of safety, and eliminating the problems that existed in conventional examples of this type. The effects it produces are remarkable and great.

[Brief explanation of drawings]

FIG. 1 is an overall explanatory diagram of a tank truck in which a bottom valve operating device is incorporated, and FIG. 2 is a piping circuit diagram of a conventional bottom valve operating device. Fig. 3 is a piping circuit diagram of an embodiment of the bottom valve operating device according to the present invention, Fig. 4 is a sectional view of the valve portion of the bottom valve operating valve, and Fig. 5 is a sectional view of the automatic return device. . FIG. 6 is a sectional view of the emergency release device, FIG. 7 is a sectional view of the bottom valve, and FIG. 8 is a sectional view of the pressure-operated valve. FIG. 9 is a cross-sectional view showing the structure of an automatic closure device, and FIGS. 10, 11, and 12 are a vertical cross-sectional view, a cross-sectional view, and a cross-sectional view for explaining the operation of an example of an emergency valve. be. FIG. 12a shows the emergency valve open, and FIG. 12b shows the emergency valve closed. 4...Bottom valve, 5, 6...Bottom valve operating valve, 7...Cylinder part (fluid operating device), 101...Pressure operating valve.

Claims (1)

[Scope of utility model registration request] Bottom valve operating valves are provided at the upper and lower parts of the tank divided into multiple chambers to operate the bottom valves of each tank compartment using fluid pressure, and the bottom valve operating valves can be operated in three positions. In this case, a type that returns to the neutral position and closes is adopted.
The rear side circuit of the bottom valve operating valve of the set is connected to
1. A bottom valve operating device for a tank truck, characterized in that the bottom valve operating device is connected to a fluid operating device for operating the bottom valve, and is connected to a low pressure section via a pressure operated valve that closes at a predetermined pressure or higher.