JPS6254709B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bottom valve operating device for a tank truck.

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. In the case of such draining and filling, the progress of draining and filling inside each tank should be monitored through the manhole window attached to the canopy of each tank compartment, or the capacity should be checked using a gauge installed at the top of the tank before draining. If the bottom valve operation section is located at the top and bottom of the tank, rather than just the bottom or top of the tank, the supervisor will finally be able to check the bottom valve operation section located at the bottom of the tank. This is preferable because the monitor can operate it by himself/herself without contacting a person, or the bottom valve operator does not have to go up and down the tank every time to monitor and operate the bottom valve.

However, it is not enough to simply have a bottom valve operating section installed at both the top and bottom of the tank. Unless the bottom valve can be closed, that is, it can be operated independently without being restricted by the operation of the other, it is inconvenient and cannot be of any use.

However, the reality is that there is still no such system in which the bottom valve is operated using fluid pressure.

The present invention has been made in view of the above points,
A fluid operating device for opening and closing the bottom valve of each tank compartment of a tank main body divided into a plurality of chambers is provided for each bottom valve, and one is provided at the upper and lower parts of the tank main body for each bottom valve, respectively. The rear circuits of the bottom valve operating valves of the set are connected to each other and connected to the fluid actuating devices of the corresponding bottom valves, and the bottom valve operating valves pressurize the respective rear circuits.
A system equipped with an operating lever for switching between three positions, closed and open, and a plectrum that biases the operating lever in the direction of automatically returning to the neutral closed position when the hand operating the operating lever is released. In addition, the bottom valve is biased in the closing direction by a plucked strip, and one embodiment will be described in detail below with reference to the drawings.

In addition, the "circuit behind the bottom valve operating valve" as used in the present invention refers to the circuit behind the bottom valve operating valve when viewed from the pressure generation source side such as a compressor. This is a circuit interposed between the actuator and the actuator.

Figure 1 is an overall view of a tank truck to which the present invention has been applied, in which 1 is the tank body, 2, ... are partition plates for configuring tank compartments, 3, ... are manhole windows with canopies for each tank compartment, 4 , ... are the bottom valves of each tank compartment, 5 is the bottom valve operating valve on the lower side of the tank, 6 is the bottom valve operating valve on the upper side of the tank, 7,... are the bottom valves for operating the bottom valve 4 with fluid pressure. A cylinder part (fluid operating device) attached to the valve, 8 indicates the above-mentioned fluid piping, 9 is a discharge valve, 10 is an emergency valve, and 11 is an emergency opening device disposed in the front circuit of the emergency valve 10. Show each.

Figure 2 shows an operating lever for switching the bottom valve operating valve to three positions: pressurizing, closing, and opening the respective rear circuits, and a neutral position automatically when the hand operating the operating lever is released. This is a piping circuit diagram of the device of the present invention, which employs a system equipped with a plucked strip that biases the bottom valve in the direction of returning to the closed position.In the figure, air is used as the fluid for operating the bottom valve, but there is no need to specify this separately. It is not limited to this and may be hydraulic.

In the figure, 12 is a compressor, 13 is an air tank, and 14,... are preferably attached to the circuit behind each operating valve.It senses the pressure in the circuit and notifies it with a display device such as a buzzer or lamp. A fluid pressure notification device that notifies the opening and closing of the bottom valve operation valves 5 and 6 mentioned above.
In the neutral A position, the fluid is shut off and closed.
In the B position, liquid is supplied and pressurized to the rear circuit connected to the cylinder portion 7, and in the C position, the fluid in the rear circuit is released to the outside.

The rear circuits of the upper and lower operation valves of the tank are connected to the cylinder section 7 on one side, and the other side is connected to a fluid emergency opening section consisting of only one emergency opening device 11 and emergency valve 10. On the other hand, the upper and lower circuits are connected to each other after merging through check valves 15, . . . , and the upper and lower circuits communicate with each other before the check valves 15.

As described above, the back side circuits of the operation valves for different bottom valves are communicated via the check valve 15, so that the reverse operation performed simultaneously on different bottom valves, that is, the bottom circuit of one Even if the fluid pressure is released by the operation valve of the valve and the fluid is injected by the operation valve of the adjacent bottom valve, the presence of the check valve 15 will cause problems such as the injected fluid flowing into the circuit that is being opened. do not have.

This is achieved by carefully using check valves.
This means that the fluid emergency release section, which would normally have to be provided separately in the circuit behind the operating valve for each bottom valve, can be omitted to just one.

The device of the present invention having the above-mentioned configuration automatically closes the circuit and releases pressurized fluid injected and pressurized when the operating lever of the operating valve on either the upper or lower side of the tank is operated and the hand is released. Since it returns to the neutral A position with no opening, when operating the other operation valve, the preceding operation will not be hindered or regulated in any way even if the two circuits are in communication with each other. You can perform any operations independently.

Next, the mechanism of the bottom valve operating valve of this embodiment will be explained with reference to FIG. 4, which is a sectional view of the valve portion, and FIG. 5, which is a sectional view of the automatic return device.

Regarding the three-way pipe joint 16 in FIG. 4,
A hole 17 for connection to the air tank 13 side, a hole 18 for connection to the circuit behind the operating valve, and a hole 19 for connection to the atmosphere side are provided, and the valve body 20 is provided for connection. A bent passage 21 is bored and an operating lever 22 is installed.

The state in which the operating lever 22 is shown in solid lines and the communication passage 21 shown in the figure does not communicate with any opening is the neutral position A, and the operating lever 22 is in the neutral position.
When the operating lever 22 is rotated to the right, the aperture 17 and the aperture 18 are connected to each other, and when the operating lever 22 is rotated to the left, the aperture 18 and the aperture 1 are connected.
9 is in communication with the C position.

In the figure, 23 is a piston rod in an automatic return device that is pivotally fixed to the operating lever 22 via a turnbuckle 24, and a force acting on it to return the operating lever 22 from the B or C position to the A position as described later. automatic recovery is performed.

In FIG. 5, reference numeral 25 denotes a cylinder body whose end is pivotally fixed to a mounting base 26, and this is divided into two chambers by a small diameter part 27 in the center.
Seat plates 28 and 29 having a larger diameter than the seat plates 28 and 29 are pressed against each other on both sides of the seat plate 7 by means of plucked strips 30 and 31, respectively.

The piston rod 23 that is inserted into the cylinder body 25 has a through hole 3 formed in the seat plate 29.
2, and its tip forms a head 33 having a smaller diameter than the small diameter portion 27 and a larger diameter than the through hole 32, and comes into contact with the seat plate 28 and is locked on the seat plate 29. There is.

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.

In the position corresponding to the above-mentioned B or C position, the piston rod 23 is moved against the plucked strip 31 or the plucked strip 30, but in both cases, when the operating lever 22 is released, the plucked strip 31 Or A by releasing the stored power of 30 hokijo
It gets pushed back towards the position. In other words, automatic recovery is performed.

The mechanism of the emergency valve 10 described above will be explained with reference to FIG.
In the two-way joint 34, a connecting hole 35 is provided on the circuit side communicating with the cylinder portion 7, and a connecting hole 36 is provided on the atmosphere side, and the valve body 37 is provided with a connecting straight passage 38. It is perforated and has an operating lever 39 planted therein.

The operating lever 39 is in the closed position when the communication passage 38 shown in the drawing, which is shown by a solid line, does not correspond to the openings 35 and 36, and the plucked strip 4 fixed to the operating lever 39 is in the closed position.
It is always held in this position by a tensile force of 0,
By rotating the operating lever 39 to the right against the plucked strip 40 and aligning the communication passage 38 with both the openings 35 and 36, the fluid can be released in an emergency manner.

The emergency release device 11 mentioned above will be explained with reference to FIG.

This is made by attaching a stopper 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 10. A plug body 4 formed in a plate shape in the hole step portion 42
In the case of Fig. 3, a cylindrical retaining screw 44 is used to press and attach, and in the case of Fig. B, a plug body 45 configured as a screw plug is installed in the opening.

In the event of a fire during refueling, the emergency valve 10 described above can close each bottom valve at the same time at a location apart from the discharge valve 9, and
The emergency release device 11 can automatically close the bottom valve when a worker cannot approach due to a fire.

The bottom valve mechanism attached to the cylinder part 7 described above is
This will be explained with a diagram.

Figure A shows an example in which the cylinder part 7 is installed inside the tank, and Figure B shows an example in which the cylinder part 7 is installed outside the tank. In the figure, 46 is an opening provided at the bottom of each tank compartment, and this is where the flange part 47 is installed. A pipe joint 48 is welded thereto, and an intervening pipe joint 48 is flange-coupled to the pipe joint 48 for communicating with the pipe leading to the discharge valve 9, and the diameter of the pipe joint 48 is compared to that of the opening 46. Since it is small and serves as a valve seat, it protrudes slightly, and the valve body 49 is brought into contact with this by an urging force such as a plucked strip.

The cylinder portion 7 has its piston rod tip fixedly attached to the valve body 49, and resists the aforementioned biasing force to push the valve body 4.
9 in the valve opening direction using fluid pressure.

That is, in the case of Fig. A, 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 this, and 51 in the figure is the pedestal 50.
52 is a passage hole drilled in the side wall of the pedestal 50; 53 is a piston; 54 is a piston rod;
5 is a communication hole provided through the piston rod 54, and when filling the tank compartment from the pipe joint 48 with a pump, the pressure inside the pipe joint 48 is transferred to the piston 53.
The pressure applied to the valve body 49 is balanced.

The piping 8 is connected to the lower part of the cylinder portion 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.

In the case of figure B, shape the branch pipe part to the pipe joint 48,
This is the cylinder part 7, and 56 in the figure is a piston rod guide shaped into the pipe joint 48;
Reference numeral 51' denotes a rod interposed between the guide 56 and the piston 53, which presses the piston 53 downward to urge the valve body 49 fixed at the tip of the piston rod 54 in the closing direction. .

The pipe 8 is connected to the bottom cover 57 of the cylinder section 7, and the fluid is forced into the lower side of the piston 53 to raise the piston rod 54 and open the valve body 49.

Since the pressure within the pipe joint 48 acts on the opposing surfaces of the piston 53 and the valve body 49, the pressure within the pipe joint 49 applied to the valve body 49 is balanced.

The piping circuit diagram shown in FIG. 3 is for a case where bottom valve operating valves 5' and 6' with a different mechanism from that shown in FIG.
Since there are two directions, the direction and the direction of the fluid emergency release part, and both are communicated with each other in the operating valves 5' and 6', the fluid is blocked and closed at the neutral position A', and the fluid is closed at the neutral position A', In the ' position, fluid is supplied and pressurized to the above-mentioned rear circuit, and in the C' position, the fluid in the rear circuit is released to the outside.

In the circuits behind the respective operation valves on the upper and lower sides of the tank, the circuits heading towards the cylinder part 7 merge in the middle, and the circuits heading towards the fluid emergency opening part pass through check valves 15, . . . After merging, the lower merging circuits also merge above that.

The functions and effects of the check valve 15 and the circuit itself in this circuit are similar to those shown in FIG.

Figure 3' shows a change in the configuration of the B' position of the operation valves 5' and 6' in Figure 3. In the B'' position, fluid is supplied only toward the cylinder section 7 of the rear circuit. However, as described above, there is no substantial difference from FIG. 3' since they are interconnected with the direction of the fluid emergency opening.

Note that the fluid operating device is not limited to the cylinder type, but may also use a diaphragm type.

As explained above, according to the present invention, it is possible to independently open and close the bottom valve either in the upper part of the tank or on the ground, which has an extremely significant effect on work efficiency.

[Brief explanation of the drawing]

Fig. 1 is an overall view of a tank truck when the present invention is applied, Figs. 2 and 3 are piping circuit diagrams of the device of the present invention, and Fig. 3' is another example of the bottom valve operating valve in Fig. 3. Figure 4 is a cross-sectional view of the valve part of the bottom valve operation valve, Figure 5 is a cross-sectional view of the automatic return device, Figure 6 is a cross-sectional view of the emergency release device, Figure 7 is a cross-sectional view of the emergency valve, Figure 8 is a sectional view of the bottom valve. Brief explanation of symbols, 1...tank body, 4...
Bottom valve, 5, 6...Bottom valve operating valve, 7...Fluid actuation device (cylinder part), 9...Discharge valve, 10...Emergency valve, 11...Emergency opening device, 15...Check valve,
22... Operating lever, 30, 31... Plucked strips.

Claims (1)

[Claims] 1. A fluid operating device 7 is provided for each bottom valve 4 to open and close the bottom valve 4 of each tank compartment of the tank body 1 which is divided into a plurality of chambers, The rear circuits of the pair of bottom valve operating valves 5 and 6 provided at the upper and lower portions are connected to each other and communicated with the fluid actuating device 7 of each corresponding bottom valve 4 after merging. 6 is
An operating lever 22 for switching each of the rear circuits to three positions: pressurizing, closing, and opening, and an attached direction that automatically returns to the neutral closed position when the hand operating the operating lever 22 is released. 1. A bottom valve operating device for a tank truck, characterized in that the bottom valve 4 is biased in a closing direction by the plucked strips.