JPS6115037Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention includes a first pipe connected to a liquid supply source via a rotary pipe joint, and a rotary pipe joint having at least one horizontal axis connected to the first pipe. The second pipe is connected to the second pipe, and the drop pipe is connected to the second pipe via a rotary joint, and the second pipe is connected to the second pipe.
The present invention relates to a loading arm for liquid transfer, which is provided with a balancer for balancing the pipe at an arbitrary angle with respect to a horizontal plane with respect to a first pipe.

In this type of loading arm, the second pipe and the drop pipe are constantly balanced by a balancer made of a torsion spring so that the operator can easily move the drop pipe and the second pipe up and down. However, since the drop pipe and the second pipe are relatively large and heavy, a fairly strong and large torsion spring is required, resulting in high cost. Furthermore, if the spring is changed, the position at which it is attached to the pipe will also change, making installation cumbersome, and making adjustments to actually balance the second pipe is also troublesome and time-consuming. Furthermore, the torsion spring may break and the drop pipe may fall suddenly, which is dangerous, but there is also a disadvantage that there is no way to prevent this.

The object of the invention is to eliminate the above-mentioned disadvantages and to provide a loading arm with a balancer that is relatively lightweight, unbulky and inexpensive, and which is simple to adjust in practice.

To achieve the above object, according to the present invention, the balancer includes an arm fixed to a first pipe side, and a piston cylinder assembly pivotally connected to be extendable and retractable between the second pipe and the arm. It has a pressure gas tank connected to the piston cylinder assembly by a conduit, and has a cylinder volume on the piston rod side of the piston cylinder assembly, the tank, a conduit connecting these, and a stop valve provided between the tank and the pressure gas source. A closed line may be formed and this closed line may be filled with pressurized gas so that the second pipe maintains its equilibrium at any position thereof.

Hereinafter, the present invention will be explained with reference to embodiments with reference to the accompanying drawings.

For reference, FIGS. 1 and 2 show a loading arm 10 using a conventional torsion spring type balancer. 1 is the tank of the tank truck, 2
11 is a flanged pipe connected to the liquid supply source, 12 is a first pipe, 13 is an elbow, 14 is a second pipe, 15 is a drop pipe, and 16, 17, 18, and 19 are rotary pipe joints. , 20
is a balancer having a torsion spring for balancing the drop pipe 15 and the second pipe 14;
Reference numeral 21 indicates a lever, and reference numeral 21a indicates an operating lever thereof.

FIG. 3 shows a loading arm equipped with a balancer according to the present invention. Similar parts as before have been given similar reference numerals.

According to the present invention, the first pipe 11 and the second pipe 1
The arm 131 is fixed to the outer peripheral surface of the horizontal rotary pipe joint 113 between the piston cylinder assembly 14a and the cylinder side end of the piston cylinder assembly 132.
The piston rod 134 is pivotally connected to a bracket 133 fixed to the arm 131, and the tip of the piston rod 134 is pivotally connected to the arm 131. Note that the positions of these pivots are selected appropriately. Furthermore, the outlet port 136 of the tank 135 attached to the first pipe 112 is connected to the piston rod side port 12 of the piston cylinder assembly 132.
7 by a conduit 138, the inlet port 139 of the tank 135 is connected to a source of pneumatic pressure by a conduit 140, and a stop valve 142 is attached to the conduit 140 to form a closed line. moreover,
A stop valve 141 may be provided in the conduit near the outlet port 136 of the tank 135 for pressure reduction. Note that in this embodiment, the tank 135
is attached to the first pipe 112, but it may be placed somewhere else.

In the device of the present invention constructed in this manner, the closed line formed by the tank 135, the conduit 138, and the cylinder space on the piston rod side of the piston cylinder assembly 132 is filled with compressed air, and the second pipes 114a and 114b are arranged substantially horizontally. Stop valve 1 of tank 135 so that it is located at
41, 142 to regulate the pressure of compressed air in the closed line. When the loading arm adjusted in this way is moved up and down by holding the tip of the second pipe 114b in your hand, it moves lightly as shown in the diagram of FIG. substantially balanced at an angle. These stop valves 141, 142 can also be used when the gas pressure in the closed line changes due to changes in ambient temperature, causing the second pipe to rise or fall slightly. In addition, a break valve is provided as a safety valve at the piston rod side port 127 of the piston cylinder assembly, and when the gas pressure in the closure line drops, the closure line is cut off there and the drop pipe 1
15 sudden falls can be prevented.

In addition, 121 indicates a sheath valve for transferring liquid of the loading arm, and 121a indicates a handle lever for opening/closing the same.

Next, FIG. 4 shows the device of the present invention installed in a loading arm equipped with a device 250 for recovering vapor generated when volatile liquid is injected into a tank. Similar parts as before have been given the same reference numerals as before. 251 is drop pipe 215
The sealing member 252 for the liquid supply hole 2 of the tank, which is attached to the sealing member 251, is a flexible member for sealing the liquid supply hole 2 of the tank with the sealing member 251 and collecting paper generated in the tank while transferring the liquid. Flexible conduit 253 is a paper collection conduit fixed to first pipe 212 and connected to flexible conduit 252.

In the loading arm shown in FIG. 4, when the drop pipe is inserted into the liquid supply hole 2 of the tank and liquid is supplied to the tank, the sealing member 251 is lifted from the tank supply hole 2 due to the pressure of the paper generated in the tank. You have to keep pushing it down so it doesn't climb up. For this purpose, in addition to a balancer similar to that shown in the embodiment of FIG.
A three-way valve 261 is installed on the second pipe 214b,
Conduit 24 connects one outlet port of this three-way valve to port 243 at the rear end of piston cylinder assembly 232.
4 and the other outlet port is connected to a conduit 240 from a source of compressed air via a pressure reducing valve 245, and a port 243 at the rear end of the piston cylinder assembly is connected to a pneumatically actuated orifice of the loading arm. Connected to valve 221 by conduit 246 . This pneumatic circuit is shown in FIG.

In the above configuration, the tank 235, the conduit 238 and the piston cylinder assembly 232
The closed line consisting of the piston rod side cylinder space is filled with compressed air, and the second pipe 214 is filled with compressed air.
A, 214b are kept in equilibrium as before, but if the three-way valve 261 is operated after the drop pipe 215 is inserted into the tank 1 and the sealing member 251 is seated in the liquid supply hole 2, the compressed air is the port 24 at the rear end of the piston cylinder assembly 232.
3 and presses the sealing member 251 of the drop pipe into the liquid supply hole 2, and at the same time, the opening valve 22
1 can be actuated into the open position by compressed air entering via conduit 246 to begin supplying liquid to the tank.

Figure 6 shows the operating force at the tip of the second pipe, with the inclination angle that the second pipe makes with the horizontal plane taken as the X-axis when the second pipe of the loading arm incorporating the device of the present invention is operated in the vertical direction. , is an example of a graph showing the pressure change of the compressed air in the tank during the operation on the Y axis. Note that the operating force is a theoretical value that ignores friction. When the second pipe is tilted upward from the horizontal position at an angle of 45°, the operating force increases by 0.8 kg, and when the second pipe is tilted downward from the horizontal position at an angle of 30°, the operating force increases by approximately 0.43 kg. do. The maximum pressure change when tilted up to 45 degrees from the horizontal position is approximately 1.0 Kg/cm ² . As is clear from this, the operating force is extremely small and the operation is easy.

In the embodiment of FIG. 3, due to changes in ambient temperature,
A stop valve 14 is provided to maintain the equilibrium state of the second pipe when the gas pressure in the closed line consisting of a tank or cylinder increases or decreases.
1,142 was manually adjusted, the embodiment of FIG. 7 automatically compensates for pressure changes in the closure line.

As is clear from Figure 6, when the second pipe is tilted upward by 45 degrees with respect to the horizontal plane, the volume of the closed line becomes the largest and the pressure within it becomes the lowest. A cam 3 is fixed to a pivot shaft connecting the tip of the piston rod of the piston cylinder assembly 332 and the tip of the arm 331.
64 pushes the operating rod 366a of the two-way valve 366 to establish communication between the compressed air source 360 and the tank 335 side. If the pressure in the closed line formed by tank 335 and piston cylinder assembly 332 is lower than the pressure P established by pressure reducing valve 362 due to a decrease in ambient temperature, then
Compressed air from a compressed air source 360 fills the closed line via a pressure reducing valve 362 . Also, when the pressure in the closed line rises due to an increase in ambient temperature and attempts to exceed the pressure P+ΔP determined by the pressure reducing valve 368, the compressed air in the closed line is exhausted from another pressure reducing valve 368. In this way, even if the pressure of the compressed air changes due to changes in the ambient temperature, the pressure in the closed line can be maintained within a predetermined range to keep the second pipe in equilibrium.

In the balancer of the present invention, in order to balance the drop pipe and the second pipe, a closed line is formed by the piston cylinder assembly and a tank communicating with this, and this closed line is filled with pressurized gas. It has the advantages of not being bulky like torsion springs, being easy to attach to the loading arm, and being extremely easy to design as well as to make actual adjustments. Furthermore, to ensure safety, a break valve can be provided near the inlet port of the piston-cylinder assembly to rupture the closure line when the pressure in the closure line drops. Sudden falls can be prevented. It is also advantageous that, even if the pressure of the pressurized gas in the closed line changes due to changes in ambient temperature, the pressure in the closed line can be maintained within a predetermined range manually or automatically by means of suitable valves. In addition, in the case of a loading arm equipped with a vapor recovery device, if the loading arm's opening valve is pneumatically operated, the sealing member of the drop pipe can be used to seal the tank by using the piston cylinder assembly of the balancer of the present invention. It is also possible to open the cap valve at the same time as pressing against the liquid supply hole.

[Brief explanation of the drawing]

Fig. 1 is a front view of a loading arm equipped with a conventional balancer, Fig. 2 is a plan view thereof, Fig. 3 is a front view of a loading arm equipped with a balancer of the present invention, and Fig. 4 is a vapor recovery device. A side view showing the balancer of the present invention attached to the loading arm, Figure 5 shows the pneumatic circuit used in Figure 4, and Figure 6 shows the operation of the tip of the second pipe with respect to the inclination angle of the second pipe of the loading arm. A graph showing force and pressure changes in the closed line of the balancer, FIG. 7, is a pneumatic circuit including means for compensating for pressure changes in the gas in the closed line of the balancer of the present invention due to changes in ambient temperature. 112; 212...first pipe, 114a, 1
14b; 214a, 214b...second pipe, 1
15; 215...Drop pipe, 113, 11
6,117,119;213,216,217,
218...Rotary pipe joint, 131; 231; 331
... Arm, 132; 232; 332 ... Piston cylinder assembly, 135; 235; 335 ...
Tank for pressure gas.

Claims (1)

[Claims for Utility Model Registration] (1) A first pipe connected to a liquid supply source via a rotary pipe joint, and a first pipe connected to the first pipe via a rotary pipe joint having at least one horizontal axis. a drop pipe connected to the second pipe via a rotary joint, and for balancing moments of the second pipe and the drop pipe with respect to the axis of the horizontal rotary joint. In the loading arm for liquid transfer provided with a balancer, the balancer includes an arm fixed to a first pipe side, a piston cylinder assembly pivotably connected to be extendable and retractable between the second pipe and the arm, and a piston. It has a pressure gas tank connected to the cylinder assembly by a conduit, and is closed by a cylinder volume on the piston rod side of the piston cylinder assembly, a tank, a conduit connecting these, and a stop valve provided between the tank and the pressure gas source. A loading arm characterized in that a line is formed and the closed line is filled with pressurized gas so that the second pipe maintains equilibrium at any position thereof. (2) The arm is fixed to the outer circumferential surface of a horizontal rotary pipe joint that is located between the first pipe and the second pipe and is located on the first pipe side, and the piston cylinder assembly is attached to the bracket fixed to the second pipe. The loading arm according to claim 1, wherein the end of a three-dimensional cylinder is pivotally connected to the free end of the arm, and the end of a piston rod is pivotally connected to the free end of the arm. (3) Utility model registration claim 1, wherein the conduit communicating between the tank and the piston cylinder assembly is provided with a safety valve that cuts off the line when the gas pressure drops. Loading arm as described in section. (4) Claim No. 1 for utility model registration, which is provided with a pressure regulating means for balancing the second pipe by regulating the gas pressure in the closed line in response to changes in ambient temperature.
Loading arm as described in section. (5) As the pressure regulating means, a pressure reducing valve is provided on the outlet port side of the tank connected to the piston cylinder assembly, and a pressure increasing valve is provided on the inlet port side of the tank connected to the liquid pressure source. A loading arm according to claim 4 of the utility model registration claim. (6) As the pressure regulating means, a cam is provided on the pivot shaft connecting the tip of the piston rod of the piston cylinder assembly and the tip of the arm, and the second pipe is opened by the cam when the second pipe is inclined to the maximum inclination angle. A two-way valve is provided in the conduit between the tank and the source of pressurized gas, and a pressure regulating valve is provided in the conduit between the two-way valve and the source of pressurized gas and in the conduit opening the closed line to atmospheric pressure. A loading arm according to claim 4 of the utility model registration claim.