JPH0470515B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention includes a main valve provided in a liquid supply path to open and close the liquid supply path, and a pilot valve to control opening and closing of the main valve. The present invention relates to a main valve opening/closing device for a liquid supply device having a valve opening/closing lever for opening and closing a valve.

[Prior Art] For example, when supplying liquid to a tank truck or the like, it is necessary to control the amount of liquid supplied by opening and closing a valve depending on the tank capacity of the tank truck.

A valve with an overflow prevention mechanism includes a main valve that opens and closes a liquid supply path and a pilot valve that controls the opening and closing of the main valve, and the pilot valve is opened and closed manually and closed by a signal from a liquid level detector. It's getting old.

By the way, the valve opening/closing lever for opening and closing the pilot valve of the valve of the conventional liquid supply device was provided only on one side of the valve device. For this reason, the shape of the loading arm made it extremely difficult to operate.

In addition, in order to supply a relatively large amount of liquid, such as when supplying liquid to a tank truck, a considerable amount of force is required to operate the main valve itself, which makes the mechanism itself complicated. A valve is used to open and close the main valve using its own hydraulic pressure. In order to control the pilot valve, the pilot valve may be provided in a separate passage, but this would complicate the entire device, so it is relatively simple to provide it in the main valve. However, it is necessary to keep the pilot valve open during liquid supply and close it immediately using a tank liquid level signal when there is a risk of overflow, but conventional technology has a relatively simple configuration. A main valve opening/closing device that operates suitably could not be obtained.

[Problems to be Solved] Therefore, an object of the present invention is to provide an easy-to-operate,
Another object of the present invention is to provide a main valve opening/closing device for a liquid supply device with an overflow prevention mechanism that can open and close the main valve with a simple configuration.

[Means for Solving the Problems] According to the present invention, there is provided a main valve that is provided in a liquid supply path and opens and closes the liquid supply path, and a pilot valve that controls opening and closing of the main valve. In a main valve opening/closing device of a liquid supply device having a valve opening/closing lever for opening and closing, a hydraulic chamber on the back of the main valve communicates with the inflow side of the main valve, and communicates with the outflow side of the main valve via a pilot valve. The pipe on the outflow side of the main valve is provided with a through shaft passing through the pipe, and the through shaft is provided with the opening/closing lever and an opening/closing means for opening/closing the pilot valve, and the opening/closing means is held. A holding means and a release means are provided for releasing the holding means in the event of overflow.

[Function] Therefore, when the valve opening/closing lever is operated, the opening/closing means for opening and closing the pilot valve opens the pilot valve, and the liquid in the hydraulic pressure chamber on the back of the main valve flows out through the pilot valve, so that the main valve A pressure difference occurs between the inlet and outlet sides, and the main valve opens. Conversely, when the pilot valve is closed using the valve opening/closing lever, the pressure in the hydraulic chamber increases and the main valve closes. During the liquid supply operation, the opening/closing means is held by the holding means, so that the main valve will not be closed inadvertently. However, in order to prevent overflow when the hatch of the lorry is full, for example, the release means is actuated by a signal from the liquid level sensor to release the holding means, so the pilot valve is closed and the main valve is closed. Also close.

Therefore, overflow can be prevented. In addition, since a through-shaft is provided, the valve opening/closing lever can be installed on either end of the through-shaft, making it possible to have a wide layout and making it easier to operate the valve due to the shape of the loading arm than in the past. Inconveniences such as difficulty are completely eliminated.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an oil depot where the main valve opening/closing device of the liquid supply device of the present invention is implemented, and a flow meter 5 and a main valve 6 are provided in the middle of a pipe 4 leading to an oil storage tank (not shown). Similarly, the main valve 6 is controlled to open and close by a control device (not shown), and the flow rate measured by the flowmeter 5 is transmitted to the control device. A loading arm 2 is erected on the rack 1, and a pipe 9 extending horizontally is connected to a pipe 7 of the loading arm 2 via a swivel joint 8, and a swivel joint 10 is connected to the pipe 9. Piping 11 through
are connected. Further, a main valve opening/closing device 13 of the liquid supply device according to the present invention, the details of which will be described later, is provided at the tip. A drop pipe 15 extending downward is connected to the main valve opening/closing device 13, and the drop pipe 15 is provided with a liquid level sensor 16. Canopy 3 of rack 1 has an oil supply indicator 1.
7 is installed.

At the oil depot, the drop pipe 15 is inserted into the tank of a tank truck (not shown), the pump (not shown) is operated to forcefully feed oil from the oil storage tank, and the opening/closing lever 22 of the main valve opening/closing device 13 is operated.
Operate to open the main valve and refuel. When a predetermined amount of liquid has been supplied, the main valve 6 closes according to the output of the control device and the liquid supply ends. When the liquid reaches this level, the liquid level sensor 16 detects it and closes the main valve. This prevents oil from overflowing from the tank and allows safe refueling.

Next, an embodiment of the main valve opening/closing device of the present invention incorporating an overflow prevention mechanism will be described in detail with reference to FIGS. 2 to 4.

The main valve opening/closing device 13 incorporating an overflow prevention mechanism is roughly divided into a valve opening/closing mechanism section 13A and a valve section 13.
It consists of B. First, to explain the valve opening/closing mechanism section 13A, the valve opening/closing mechanism is covered with a valve opening/closing mechanism housing 20.
0 and a valve housing 50 which will be described later. The through shaft 21 is connected to the housing 2
A valve opening/closing lever 22 is attached to the shaft end protruding from 0, and by moving this lever 22, the through shaft 21 is rotated. First, an example of the valve opening/closing means will be explained.
A first cam 23 is fixed to 1, and a pin 24 is implanted in the cam 23. Penetration shaft 2
A second cam 25 is loosely fitted into the second cam 25, and the cam 25 is formed with a long hole 25a, into which the pin 24 of the first cam 23 is inserted. The through shaft 21 is fitted into a cylinder shaft 31, and a second lever 32 having a cam surface shown in FIG. 4 is fixed to the tip of the cylinder shaft 31, and a first lever 32 is fixed to the base end. A lever 29 is fixed, and a short shaft 28 is implanted in the first lever 29. A doglegged arm 6 is loosely fitted onto the short shaft 28 of the first lever 29, and this arm 26 is biased counterclockwise in FIG. 3 by a spring 30. A roller 2 is attached to one end of the doglegged arm 26.
7 is provided, and this roller 27
The groove 25b (FIG. 6) of the cam 25 is adapted to engage with the groove 25b (FIG. 6). These parts 28, 29, 30,
31 and 32 constitute valve opening/closing means for the pilot valve 52.

Next, an embodiment of the holding means will be described. A locking claw 3 is attached to a short shaft 34 embedded in the housing 20.
3 is fitted, and this locking pawl 33 is biased counterclockwise in FIG. 3 by a spring 36, and a pin 35 is implanted in the locking pawl 33. The locking claw 33 is located between the first notch 25c and the second notch 25d of the second cam 25.
The pin 35 engages with the shoulder portion 23a of the first cam 23 to prevent rotation of the second cam 25, and the pin 35 is in contact with the shoulder portion 23a of the first cam 23. Therefore, these parts 25, 33,
Reference numerals 34, 35, and 36 constitute holding means for the opening/closing means.

Finally, an embodiment of the release means will be described. A liquid level sensor 16 is installed in the housing 20 of the valve opening/closing mechanism 13A.
(Fig. 1) is equipped with an air cylinder 40 that is activated by sending air when it detects liquid.
A coil spring 44 is interposed between the piston 42 and the valve housing 41, and urges the piston 42 upward in FIG. When air is supplied, the piston rod 43 protrudes downward against the force of the spring 44, acts on the arm 26, and moves the roller 27 of the arm 26 toward the second cam 2.
5 from the groove 25b. Therefore, these parts 40, 41, 42, 43, 44
constitutes the release means.

Next, the valve portion 13B will be explained.
B has a main valve 51 and a pilot valve 52, and the main valve 51 and the pilot valve 52 are housed in a valve housing 50. The main valve 51 has a truncated conical cup shape, and a pilot valve 52 is provided in the center thereof. Pilot valve 5
2 has a valve rod 53 extending downward, and the pilot valve 52 is opened and closed by the second lever 32 via this valve rod 53. The valve housing 50 is divided into a hydraulic pressure chamber 50a and an outer chamber 50b by a main valve 51, and the hydraulic pressure chamber 50a and the outer chamber 50b are connected to a small diameter passage 5.
They are communicated at 0c to achieve the same static pressure. The main valve 51 and the pilot valve 52 are urged downward in FIG. 2 by coil springs 54 and 55, respectively.

Details of refueling will be described later, but when refueling, rotate the valve opening/closing lever 22 to open the pilot valve 5.
When the loading arm 2 is opened, the oil flowing through the piping 11 of the loading arm 2 applies pressure from the outer periphery of the main valve 51 to push the main valve 51 upward. A part of the oil also flows into the inner chamber 50a through the passage 50c, and the static pressure in the hydraulic pressure chamber 50a becomes the same as that in the outer chamber 50b, but since the pilot valve 52 is opened, the oil from the passage 50c is Pilot valve 52 than the inflow amount
The amount of oil flowing out from the hydraulic chamber 5 is larger.
The pressure inside 0a decreases, and eventually the pressure inside the outer chamber 50b becomes higher than that inside the hydraulic pressure chamber 50a, and the main valve 5
1 is pushed up against the force of the coil spring 54. As a result, oil is supplied from the pipe 11, through the valve 13, and through the drop pipe 15 to the tank truck. When the pilot valve 52 closes, the main valve 51 is also closed by the hydraulic pressure in the hydraulic pressure chamber 50a and the coil spring 54.

Next, the mode of oil supply using the valve incorporating the overflow prevention mechanism will be explained with reference to FIGS. 5 and 6.

(1) Valve opening operation Figure 3 shows the valve in the fully closed state. To open the valve, move the valve opening/closing lever 22 counterclockwise from the solid line position to the dotted line position in FIG. 3. Then, the through shaft 21 is also rotated counterclockwise, and the first cam 23 fixed to the through shaft 21 is also rotated counterclockwise. Then, the pin 24 of the first cam 23 is connected to the second cam 25.
Since it is inserted into the elongated hole 25a, the second cam 25
is turned counterclockwise in FIG. When the second cam 25 rotates, the roller 27 of the arm 26 engages with the groove 25b of the second cam 25, so the arm 26 rotates counterclockwise in FIG. 3. Since the support shaft 28 of the arm 26 is implanted in the first lever 29, when the arm 26 rotates, the first lever 29 rotates counterclockwise in FIG. 3 and is fixed to the lever 29. cylinder shaft 31
is turned counterclockwise in FIG. As the cylinder shaft 31 rotates, the second lever 32 fixed to the cylinder shaft 31 is turned counterclockwise in FIG. 4, and the pilot valve 52 moves upward in FIG. 2 against the force of the coil spring 55. The pilot valve 52 is opened.

The locking pawl 33 was in the first notch 25c of the second cam 25 in the fully closed state shown in FIG. 3, but in the fully open state shown in FIG.
Then, the clockwise rotation of the cam 25, that is, the rotation of the lever 32 is locked or held via the arm 26, the lever 29, and the cylindrical shaft 31, and the valve is maintained in the fully open state. When the pilot valve 52 is opened, the main valve 51 opens in the manner described above to supply oil.

(2) Valve closing operation Figure 5 shows the valve fully open. If refueling is performed in this state, and the predetermined amount of refueling is completed, the main valve 6 is closed and refueling is completed, and the oil in the pipe 11 naturally flows out. Turn the valve opening/closing lever 22 clockwise to return it to its original position. Then, the through shaft 21 rotates clockwise in FIG. 5, and the first cam 23 fixed to the through shaft 21 rotates clockwise in FIG.
rotates clockwise in FIG.
5 is released. Note that since the second cam 25 has a long hole 25a, the shoulder portion 23a of the pin 24 of the first cam 23 is aligned with the pin 35 of the locking claw 33.
Push the locking claw 33 to the second position of the second cam 25.
It does not act on the cam 25 until it comes off the notch 52d. When the locking claw 33 comes off the second notch 25d of the second cam 25, the pilot valve 52 and the main valve 51 are closed by the restoring force of the valve springs 54, 55. When the valve closes, the valve rod 53 moves to the lever 3.
2 clockwise, cam 25 and arm 2.
6 returns to the state shown in FIG. Also, the locking claw 33 is again located in the first notch 2 of the second cam 25.
5c, and the valve becomes fully closed as shown in FIG.

(3) At the time of overflow If the liquid level sensor 16 detects liquid during refueling with the valve fully open as shown in Fig. 5, pressurized air is supplied from the pressurized air source to the air cylinder 40,
Piston 42 moves downward against the force of coil spring 44, and arm 26 is pushed downward by piston rod 43 in FIG. When the arm 26 is pushed downward, the arm 26 rotates clockwise about the shaft 28, and the roller 27 of the arm 26 is disengaged from the difference 25b of the second cam 25, as shown in FIG.
Since the support shaft 28 of the arm 26 is implanted in the first lever 29, when the roller 27 comes off the groove 25b of the second cam 25, the second lever 32 is moved by the restoring force of the coil springs 54 and 55 of the valve. The cylinder shaft 31 fixed thereto is returned clockwise. This releases the state that was previously held by the holding means,
Valves 51 and 52 are closed. At that time, the first cam 23,
Second cam 25, through shaft 21, locking claw 33
Since the valve opening/closing lever 22 is in the fully open position, the valve opening/closing lever 22 will not return. Then, when the valve opening/closing lever 22 is returned clockwise, the valve becomes fully closed as shown in FIG. 3. By the way, conventionally, the valve opening/closing lever 22 was provided only on one side of the valve device. Therefore, depending on the installation state of the loading arm 2, it was very difficult to operate. Therefore, in order to be able to attach the valve opening/closing levers 22 on both sides of the valve device, the cylinder shaft 31 is used as the shaft to which the second lever 32 for opening and closing the pilot valve 52 is fixed, as shown in FIG. Axis 3
A through shaft 21, which is inserted through the inside of the valve housing 50 and to which the valve opening/closing lever 22 is attached, is made to protrude from the valve housing 50, so that the valve opening/closing lever 22 can be attached to the protrusion 21a. As a result, the valve opening/closing lever 22 can be installed on either side of the valve device, allowing for a wider layout, and eliminating inconveniences such as difficulty in operation due to the installation condition of the loading arm 2, which was the case in the past. be done. Incidentally, the unused shaft end portion 21a may be covered with a cap 37.

[Effects of the Invention] As described above, according to the present invention, the main valve can be opened and closed with a relatively simple configuration, and in the event of an overflow, the release means can release the holding means without moving the valve opening/closing lever. Since the valve opening/closing means closes the pilot valve and therefore closes the main valve, operation is reliable and overflow can be prevented in case of an emergency.

In particular, in the present invention, since a through-shaft is provided, the valve opening/closing lever can be provided on either side of the through-shaft, and it is not difficult to operate with a loading arm.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the entire outline of an oil depot in which the present invention is implemented, Figs. 2 and 3 show a main valve opening/closing device incorporating an overflow prevention mechanism in which the present invention is implemented, and Fig. 2 is a longitudinal section. Sectional view, Figure 3 is a cross-sectional view,
Figure 4 is an explanatory diagram showing the relationship between the valve opening/closing lever, the pilot valve, and the pilot valve opening/closing lever;
The figure and FIG. 6 show the operating state of the valve opening/closing mechanism,
FIG. 5 is an explanatory view showing the valve in its fully open state, and FIG. 6 is an explanatory diagram showing the operating state at the time of overflow, that is, trip. 20... Valve opening/closing mechanism housing, 21... Penetration shaft,
22... Valve opening/closing lever, 23... First cam, 23a
...Shoulder, 24...Pin, 25...Second cam, 25a
...Elongated hole, 25b...Groove, 25c...First notch, 25
d...second notch, 26...dog-shaped arm, 27...roller, 28...short shaft, 29...first lever, 30...
Coil spring, 31... cylinder shaft, 32... second lever,
33...Lock claw, 34...Short shaft, 35...Pin,
36...Coil spring, 37...Cap, 40...Air cylinder, 41...Cylinder, 42...Piston,
43... Piston rod, 44... Coil spring, 50
... Valve housing, 50a... Hydraulic pressure chamber, 51... Main valve,
52...Pilot valve, 53...Shaft, 54...Coil spring, 55...Coil spring.

Claims (1)

[Claims] 1. A main valve of a liquid supply device that is provided in a liquid supply path and includes a main valve that opens and closes the liquid supply path, a pilot valve that controls the opening and closing of the main valve, and a valve opening/closing lever that opens and closes the pilot valve. In the spinning device, a hydraulic chamber on the back side of the main valve communicates with the inflow side of the main valve, and communicates with the outflow side of the main valve via the pilot valve,
The pipe on the outflow side of the main valve is provided with a through shaft passing through the pipe, and the through shaft is provided with the valve opening/closing lever and an opening/closing means for opening/closing the pilot valve, and a holder for holding the opening/closing means. 1. A main valve opening/closing device for a liquid supply device, comprising: a means for holding the holding means; and a releasing means for releasing the holding means at the time of overflow.