JP3303452B2 - Unloading equipment for tank trucks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unloading device for a tank lorry, and more particularly to an unloading device for a tank lorry in which a bottom valve for pneumatic operation is provided in each tank chamber.

[0002]

2. Description of the Related Art A tank truck has a plurality of tank chambers in which different types of oil can be stored in a tank, and a bottom valve is provided at the bottom of each tank chamber. It can be unloaded.

[0003] When unloading with a scale, that is, when unloading all the oil in the tank chamber and unloading to a predetermined mark in the tank chamber, the worker climbs to the upper part of the tank of the tank truck and unloads. Open the tank compartment hatch
While watching the oil level in the tank room, when the oil level drops to the predetermined mark, send a signal to the ground worker to close the corresponding bottom valve (the bottom valve operating device is on the ground) , Or itself descends from the top of the tank, closing the bottom valve.

As described above, since it is not efficient for the worker at the top of the tank to send a signal to the worker on the ground or to get down to the ground and operate the bottom valve, the work efficiency is poor. Instead, a pneumatic type is being considered, in which the bottom valve can be operated from the top of the tank.

[0005]

In an unloading apparatus employing a pneumatic bottom valve and controlling the opening and closing of the bottom valve by a manually operated valve at the top of the tank, a manually operated valve is required at the top of the tank for each tank chamber. When the number of tank chambers is large, the structure is complicated.

[0006] An object of the present invention is to reduce the number of operating valves used when unloading by sizing, and to simplify the structure required for unloading by sizing. Is to provide an unloading device. It is an object of the invention of claim 2 to ensure that the bottom valve can be closed by the operation valve at the top of the tank. A third object of the present invention is to provide an unloading device for a tank lorry vehicle that can securely close the bottom valve when not operating to enhance safety, despite the connection of an operation valve for operating the upper part of the tank. It is to be. It is an object of the present invention to provide an unloading device for a tank lorry vehicle in which the operation valve and the pipe for the operation valve do not obstruct the operation of the upper part of the tank except during the shaving operation. An object of the invention of claim 5 is to provide an unloading device for a tank lorry, which can surely close a bottom valve when an operation valve is disconnected and can prevent leakage of high-pressure air.

[0007]

The present invention will be described with reference to the drawings corresponding to the embodiments. The tank truck (10) as a premise of claim 1 includes a tank (12) partitioned into a plurality of tank chambers (16), and the bottom of each tank chamber (16) is supplied at the time of high pressure supply and atmospheric pressure supply. It has a bottom valve (20) that opens and closes respectively. The unloading device of the tank truck (10) according to the first aspect has the following components (a) to (c). (A) When the high pressure is supplied as the pilot air pressure, one main valve (68) is set to be a position through which the high pressure air is passed. (B) The main valve (68) is provided corresponding to each bottom valve (20). Bottom valve control switching valve that connects and disconnects the outlet and bottom valve (20) with each other
(66) and (c) a portable operation valve (88) which is carried by an operator at the top of the tank (12) and which can supply high pressure air to the main valve (68) as pilot air pressure by operation of the operator.

According to the second aspect of the present invention, the portable operation valve (88) is a portable three-way valve (88). The portable three-way valve (88) is connected to the pilot port (70) of the main valve (68) at the first and second switching positions, respectively.
(74) Connect the side and the atmospheric pressure source.

According to the third aspect of the present invention, the portable three-way valve (88) is connected to the second three-way valve (88) when the operating force is released.
And a biasing means (94) for switching to the switching position.

In the unloading device for a tank truck (10) according to claim 4, the portable three-way valve (88) is provided with a one-touch coupling (8).
It is assembled between the high pressure air source (74) side and the pilot port (70) side of the main valve (68) via 6).

According to a fifth aspect of the present invention, the one-touch coupling (86) is a portable three-way valve.
When removing (88), the high pressure air source (74) side and the pilot port (70) side are closed and open to the atmosphere, respectively.

[0012]

In the unloading device for a tank truck (10) according to the first aspect, the bottom valve control switching valve (66) corresponding to the tank chamber (16) to be unloaded is switched to the bottom valve (20) side. Is connected to the main valve (68) side. The operator carries the portable operation valve (88) above the tank (12) and operates the portable operation valve (88). When the portable operation valve (88) is in a position for supplying high-pressure air to the main valve (68), high-pressure air is supplied to the main valve (68) as pilot air pressure, and the main valve (68) It is a position through which high-pressure air passes, and the high-pressure air is supplied to the corresponding bottom valve (20) via the main valve (68) and the bottom valve control switching valve (66).
(20) is opened. When ending unloading, the portable operation valve (88) is set to a position not supplying high-pressure air to the main valve (68),
The main valve (68) is at a position where high-pressure air is not supplied as pilot air pressure from the portable operation valve (88) and high-pressure air does not pass therethrough. As a result, the supply of high-pressure air via the main valve (68) is stopped, and the bottom valve (20) is closed.

In the unloading device for a tank truck (10) according to the second aspect, when the main valve (68) is set to a position for passing high-pressure air and a position for shutting off the high-pressure air, the portable three-way valve (88) is connected to the first and second valves, respectively. This is the second switching position. In the second switching position of the portable three-way valve (88), the pilot port (70) of the main valve (68) is connected to the atmospheric pressure source, and the remaining high-pressure air is completely evacuated.

According to the third aspect of the present invention, the portable three-way valve (88) is automatically released by the urging means (94) when the operating force is released by the operator. Switch position. Main valve (68) is pilot port (70)
At the supply of atmospheric pressure from the portable three-way valve (88),
Closes.

According to a fourth aspect of the present invention, the one-touch coupling (86) is a portable three-way valve.
(88) and the high pressure air source (74) side and the pilot port (70) side of the main valve (68), the portable three-way valve (8
8) can be incorporated and removed via a one-touch coupling (86).

According to a fifth aspect of the present invention, the portable three-way valve (88) includes a one-touch coupling (8).
When detached from 6), one-touch coupling (86)
Open the pilot port (70) side to the atmosphere and
(74) Close the side. This allows the pilot port (70)
The high pressure air on the side is prevented from escaping through the portable three-way valve (88), and the main valve (68) is connected to the pilot port (70).
At atmospheric pressure and closes.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 6 is a side view of the tank truck 10. The tank truck 10 includes a tank 12, and the inside of the tank 12 is partitioned into a plurality of tank chambers 16 in the front-rear direction by a partition wall 14, so that different types of oil 18 can be stored in the respective tank chambers 16.
The bottom valve 20 is provided at the bottom of each tank chamber 16 and
Controls the derivation of oil 18 from 16.

FIG. 5 is a detailed structural view of the bottom valve 20. The bent pipe 28 is disposed below the tank chamber 16, and has an upwardly upper end fixed to the bottom wall 26 of the tank chamber 16 and a lower end horizontally oriented. Unloading piping common to each tank chamber 16 (not shown)
Extends below the tank 12 in the front-rear direction of the tank truck 10, and is connected to the lateral lower end of each bottom valve 20. The suction / discharge port 30 is defined inside the upper end of the bent pipe 28, and connects the inside of the tank chamber 16 and the inside of the bent pipe 28 to each other. Valve seat 32
Is formed on the upper surface of the peripheral portion of the suction / discharge port 30 as an annular ridge along the peripheral portion. The annular packing 36 is inserted into the annular groove on the lower surface side of the valve body 34, and the annular packing 36
To the valve seat 32 and sit down. The annular member 38 is a valve body 34
The bolt 40 is inserted into the valve body 34 and the annular member 38 from the upper surface side of the valve body 34, and the nut 42 is screwed from below the annular member 38, and the annular member 38 is attached to the valve body 34. Fixed to. The annular member 38 has a tapered inner periphery 39 whose diameter gradually increases downward. The outer diameter of the annular member 38 is slightly smaller than the diameter of the suction / discharge port 30, and when the valve body 34 is seated on the valve seat 32,
An annular gap 41 is formed between the peripheral surface of the suction / discharge port 30 and the outer periphery of the annular member 38.

The cylinder member 44 has a structure that closes and opens at upper and lower ends, respectively, and is screwed to the inner peripheral side of the upper end of the valve body 34 at the lower end. Annular packing 46
Is pressed between the lower end of the cylinder member 44 and the valve body 34 in the vertical direction, and seals the joint between the cylinder member 44 and the valve body 34. The piston 48 is disposed in the cylinder member 44 so as to relatively slide vertically on the inner circumference of the cylinder member 44. The hollow shaft 50 has a lower end fixed to a lower portion of the bent tube 28, protrudes below the bent tube 28, and extends upward into the cylinder member 44. The hollow shaft 50 is slidable up and down relative to the valve body 34 at a penetrating portion of the valve body 34, and a piston 48 is fixed at an upper end portion. The piston 48 divides the inside of the cylinder member 44 into an upper air chamber 52 and a lower liquid chamber 54, and a through hole 56 is formed in the valve body 34 to move the liquid chamber 54 to the lower surface side of the valve body 34. They are communicating. The pressure acting area where the liquid pressure in the liquid chamber 54 acts on the upper surface of the valve body 34 is larger than the pressure acting area where the hydraulic pressure of the suction / discharge port 30 acts on the lower surface of the valve body 34. And cylinder members 44
Is set. The communication hole 60 extends obliquely downward radially inward from the recess on the upper surface side of the piston 48,
Inside.

The compression coil spring 58 has a piston
It is contracted between the lower surface of 48 and the upper surface of the valve element 34 to urge the valve element 34 downward. The filter 62 has a cylindrical shape whose upper end is closed, covers and covers the bottom valve 20 from above, and has a lower end peripheral edge fixed to the bottom wall 26. The total cross-sectional area of through hole 56 is valve seat 32
Is set to 30% or more of the cross-sectional area on the inner peripheral side of.

The opening and closing operation of the bottom valve 20 will be described. Air chamber
When the atmospheric pressure is supplied to the valve 52 through the hollow shaft 50, the valve body 34 is pressed downward by the compression coil spring 58, and is held in a state in which the annular packing 36 is in close contact with the valve seat 32. Thereby, the bottom valve 20 is closed.

When loading the oil 18 into the tank chamber 16,
Oil 18 flows into each bent pipe 28 from a common unloading pipe. When the bottom valve 20 is closed, the oil 18 that has reached the lower surface of the valve body 34 is
The liquid chamber 54 passes through the tapered inner periphery 39 of the annular member 38 and the through hole 56.
Introduced into. Since the cross-sectional area of the liquid chamber 54 is slightly larger than the cross-sectional area of the suction / discharge port 30, the pressure acting area of the annular packing 36 on the liquid chamber 54 side is larger than the pressure acting area on the suction / discharge port 30 side. Oil for loading, 18
A large force is exerted downward from above to maintain the seated position on the valve seat 32. The total cross-sectional area of the through hole 56 is the liquid chamber 54
30% or more of the cross-sectional area of
This is based on the result of an experiment in which it was confirmed that the valve body 34 was quickly introduced into the liquid chamber 54 in spite of the restriction in the above to prevent the valve body 34 from separating from the valve seat 32. As a result, the bent pipe 28
Tank chamber 16 bottom valve unrelated to the loading oil 18 that has reached
20 holds closed.

The oil 18 in the tank chamber 16 is unloaded or the tank chamber 16 is unloaded.
When the oil 18 is loaded, the air chamber 52 is supplied with high-pressure air. Since the piston 48 is vertically fixed to the bent pipe 28 via the hollow shaft 50, as a result of the high pressure in the air chamber 52, the cylinder member 44 rises and the valve body 34 separates from the valve seat 32. At the initial stage of separation, the annular member 38 is still inside the suction / discharge port 30 and the inside of the tank chamber 16 and the inside of the bent pipe 28 only communicate with each other via the annular gap 41, Oil of
When unloading 18, the oil 18 in the tank chamber 16
It is led out at a small flow rate via 41, and the transmission of the large water hammer to the discharge valve at the lower end of the unloading pipe is suppressed.
When the cylinder member 44 gradually rises and reaches the upper position (the position indicated by the two-dot chain line in FIG. 5), the annular member 38 comes out of the suction / discharge port 30, and the suction / discharge port 30 is greatly opened, and the tank chamber 16 is opened.
The inside and the inside of the bent pipe 28 communicate with each other through a suction port 30 which is widely opened.

When high-pressure air enters the air chamber 52 from the upper end of the hollow shaft 50, moisture in the high-pressure air condenses and accumulates on the upper surface of the air chamber 52 due to adiabatic expansion. The accumulated water enters the hollow shaft 50 through the communication hole 60 by gravity, descends the hollow shaft 50, and is discharged to the outside.

FIG. 2 is a pneumatic circuit diagram from the main valve 68 to the bottom valve 20. The manual switching valve 66 is provided corresponding to each bottom valve 20, and the outlet side is connected to the hollow shaft 50 of the bottom valve 20 through each shuttle valve 64.
Is connected to the lower end. The main valve 68 is provided in common with each bottom valve 20 and is a pilot port supplied with pilot air pressure.
70, and a compression coil spring 72 having an urging force in a direction opposite to the urging force of the pilot air pressure at the pilot port 70.

FIG. 1 is a pneumatic circuit diagram from the air tank 74 to the main valve 68. The two air tanks 74 store high-pressure air and include a protection valve 76, a rear manual emergency valve 78, and a left manual emergency valve.
It is connected via 80 to the inlet side of the main valve 68. Protection valve 76
When the pressure on the side of the air tank 74 becomes excessive, the valve is opened to appropriately release high-pressure air in the air tank 74. The rear manual emergency valve 78 and the left manual emergency valve 80 are
It is arranged behind and on the left side of 10, and is closed in an emergency to stop the supply of high-pressure air to the main valve 68 side. Emergency stop valve 82, automatic emergency stop valve 84 and one-touch coupling 86
Controls the passage from the left manual emergency valve 80 and the inlet side of the main valve 68 to the pilot port 70 of the main valve 68. The emergency stop valve 82 is provided on the operation panel, and connects the automatic emergency closing plug 84 side, that is, the outlet side to the atmospheric pressure space by an emergency operation. The automatic emergency closing plug 84 automatically connects the one-touch coupling 86 to the atmospheric pressure space in an emergency. The one-touch coupling 86 is provided above the tank 12. The portable manual three-way valve 88 has a hose 90 of an appropriate length connected to the inlet side and the outlet side, and the hose 90 is connected to the portable manual three-way valve 88.
A coupler is mounted on the end opposite to the end, and is detachably attached to the one-touch coupling 86 with one touch via the coupler. The portable manual three-way valve 88 has a pushing rod 92 pushed by an operator, and a compression coil spring 94 having a biasing force in a direction opposite to the pushing force of the pushing rod 92. The portable manual three-way valve 88 connects the outlet side to the inlet side when the push rod 92 is pushed, and connects the outlet side to the atmospheric pressure space when the push rod 92 is not pushed.

FIGS. 3 and 4 are views showing the stored state and the detached state of the portable manual three-way valve 88 in the storage case 96. FIG.
The storage case 96 is provided at a predetermined location above the tank 12. When the portable manual three-way valve 88 is stored in the storage case 96, the push rod 92 is pushed by the end wall of the storage case 96. When the portable manual three-way valve 88 is removed from the storage case 96, the push rod 92 is in a protruding state by the compression coil spring 94.

The operation of the embodiment will be described. When the oil 18 in the tank chamber 16 is to be unloaded by the measure, the manual switching valve 66 corresponding to the tank chamber 16 to be unloaded is located at a position connecting the base valve 68 to the bottom valve 20. The worker lifts the tank 12 and removes the portable manual three-way valve 88 from the storage case 96 while holding the hose 90.
Tank chamber for unloading while connecting the coupler at one end to the one-touch coupling 86 and carrying the portable manual three-way valve 88
Proceed to 16 and open the upper hatch. And the oil inside 18
While pushing, push the push rod 92 in. As a result, the portable manual three-way valve 88 is in a position where the pilot port 70 side is connected to the air tank 74 side, high-pressure air is supplied to the pilot port 70 of the main valve 68, and the main valve 68 switches the air tank 74 side manually. Connected to valve 66 side and opposed. As a result, the high-pressure air flows through the manual switching valve 66 of the unloading tank chamber 16 and the bottom valve 20.
Is supplied to the air chamber 52, the bottom valve 20 is opened, and the tank chamber 16 is opened.
The oil 18 inside is discharged. Other manual switching valve 66 is bottom valve 20
The side is connected to the atmospheric pressure space, and the bottom valve 20 of the tank chamber 16 which is not unloaded is supplied with the atmospheric pressure to the air chamber 52 and is closed.

When it is confirmed through the open hatch that the oil 18 in the tank chamber 16 to be unloaded has dropped to a predetermined mark, the pushing of the pushing rod 92 of the portable manual three-way valve 88 is released. Thereby, the portable manual three-way valve 88 connects the pilot port 70 side to the atmospheric pressure space, and the main valve 68 is supplied with the atmospheric pressure to the pilot port 70, and connects the manual switching valve 66 side to the atmospheric pressure space. Position. As a result, the bottom valve 20 of the unloaded tank chamber 16 is supplied with the atmospheric pressure to the air chamber 52, closed, and the unloading of the oil 18 is completed.

Similarly, when the operator releases his hand from the push rod 92 of the portable manual three-way valve 88 for some reason, regardless of his intention, the push of the push rod 92 is released and the bottom valve 20 is closed. As a result, the unloading of the oil 18 is stopped.

After setting all the manual switching valves 66 to the position where the bottom valve 20 side is connected to the atmospheric pressure space, the portable manual three-way valve 88
Is stored in the storage case 96 as shown in FIG. 3, the push rod 92 is at the push position, and the main valve 68 is connected to the pilot port.
High-pressure air is constantly supplied to 70 and is maintained at a position where the air tank 74 side is connected to the manual switching valve 66 side. This allows
The operator can operate the manual switching valve 66 on the ground to control the opening and closing of the bottom valve 20 of any tank chamber 16.

When the coupler of the hose 90 is removed from the one-touch coupling 86, the one-touch coupling 86 connects the pilot port 70 to the atmospheric pressure space and closes the air tank 74. As a result, the high-pressure air is prevented from leaking out of the one-touch coupling 86, and the main valve 68 is supplied with the atmospheric pressure to the pilot port 70, and the supply of the high-pressure air to the manual switching valve 66 is stopped. I do. As a result, all the bottom valves 20 are prevented from being opened.

[0033]

According to the first aspect of the present invention, a common base valve and a portable operation valve are provided for a plurality of tank chambers, and the bottom valve can be opened and closed by operating the portable operation valve. In this case, the provision of the operation valve is omitted, and the structure for performing the shaving is simplified.

According to the second aspect of the invention, the portable operation valve is a portable three-way valve, and when the portable three-way valve is switched to the second switching position, the pilot port of the main valve is connected via the portable three-way valve. Since it is connected to the atmospheric pressure source, the remaining high-pressure air at the pilot port can be appropriately removed, and the main valve can be reliably closed.

According to the third aspect of the present invention, when the operator does not operate the portable three-way valve, the portable three-way valve is automatically brought to the second switching position by the urging means, and Atmospheric pressure is supplied to the pilot port, and the bottom valve is closed. Therefore, when not operating, the bottom valve can be securely closed to enhance safety.

According to the fourth aspect of the present invention, the portable three-way valve can be easily assembled and detached via the one-touch coupling, and the portable three-way valve can be detached except at the time of the shaving work to remove the portable three-way valve. Since the hose can be removed from the upper part of the tank, the efficiency of other operations can be improved.

According to the fifth aspect of the present invention, the one-touch coupling closes the high-pressure air source side and the pilot port side and connects to the atmospheric pressure source when the portable three-way valve is removed. When disconnected, the bottom valve can be securely closed to enhance safety.

[Brief description of the drawings]

FIG. 1 is a pneumatic circuit diagram from an air tank to a main valve.

FIG. 2 is a pneumatic circuit diagram from a main valve to a bottom valve.

FIG. 3 is a view showing a storage state of a portable manual three-way valve in a storage case.

FIG. 4 is a view showing a state where a portable manual three-way valve is removed from a storage case.

FIG. 5 is a detailed structural view of a bottom valve.

FIG. 6 is a side view of the tank truck.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Tank truck 12 Tank 16 Tank room 20 Bottom valve 66 Manual switching valve 68 Main valve 70 Pilot port 74 Air tank (high pressure air source) 86 One-touch coupling 88 Portable manual three-way valve (Portable operation valve, Portable three-way valve) 94 Compression coil spring (biasing means)

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masahiro Ikeda 5-5-5 Shirogane, Minato-ku, Tokyo Keiwa Kogyo Co., Ltd. (56) References JP-A-5-41963 (JP, A) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) B60P 3/22-3/24

Claims (5)

(57) [Claims] A tank partitioned into a plurality of tank chambers (16)
(12) and a tank lorry (10) having a bottom valve (20) which opens and closes at the bottom of each tank chamber (16) when supplying high pressure and when supplying atmospheric pressure, respectively. Is provided at a position through which high-pressure air is passed when is supplied as pilot air pressure, and (b) an outlet of the main valve (68) provided corresponding to each of the bottom valves (20) And a bottom valve control switching valve (66) for connecting and disconnecting the bottom valve (20) and the bottom valve (20), and (c) the base valve carried by an operator at the upper part of the tank (12) and operated by the operator. An unloading device for a tank lorry, comprising a portable operation valve (88) capable of supplying high-pressure air to the (68) as pilot air pressure. The portable operation valve (88) is a portable three-way valve (8).
8), and the portable three-way valve (88) is connected to the pilot port (70) of the main valve (68) at the first and second switching positions.
2. The unloading device for a tank lorry according to claim 1, wherein a high pressure air source (74) and an atmospheric pressure source are connected. 3. The tank lorry according to claim 2, wherein the portable three-way valve (88) has an urging means (94) for switching to a second switching position when the operating force is released. Unloading equipment. 4. The portable three-way valve (88) is connected to the high-pressure air source (74) side via the one-touch coupling (86) with the main valve.
4. The unloading device for a tank truck according to claim 3, wherein the unloading device is installed between the pilot port (70) and the pilot port (70). The one-touch coupling (86) is connected to the high-pressure air source (7) when the portable three-way valve (88) is detached.
The unloading device for a tank truck according to claim 4, wherein the 4) side and the pilot port (70) side are closed and open to the atmosphere, respectively.