Self-sealing crane pipe for oil tank truck

Abstract

A self-sealing loading arm for an oil tank truck comprises an upper loading arm body, the upper loading arm body comprises a first oil pipe, a second oil pipe and an insertion pipe, the oil inlet end of the first oil pipe is connected with a venturi tube through a rotary connector, the lower end of the venturi tube is fixedly connected with the outlet end of a high liquid level valve, and the second oil pipe is rotationally connected with the first oil pipe. The insertion pipe is rotatably connected with the second oil pipe and used for extending into the oil tank, a control pilot valve is located on one side of the high liquid level valve and communicated with the high liquid level valve, the control pilot valve is communicated with the venturi tube through a breather pipe, an overflow pipe and an exhaust pipe are arranged on the outer side of the insertion pipe, and the control pilot valve is communicated with the overflow pipe and the exhaust pipe. The tail end of the exhaust pipe is connected with an exhaust valve, and the overflow pipe extends out of the oil outlet end of the insertion pipe and is used for reaching the bottom of the oil tank. The loading arm can prevent a medium in an oil tank truck from overflowing without the help of external force.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid loading and unloading equipment, in particular to a self-sealing crane pipe for an oil tanker. Background Art

[0002] The crane hose is a fluid loading and unloading arm, which is mostly used for loading and unloading of petroleum and chemical land-based liquids. The medium in the hose is oil, water, etc. It is divided into many types. Compared with the old hose, it has the advantages of high safety and flexibility.

[0003] There are currently two ways to close the top of a tanker truck during filling. One is to install an overflow sensor at the insertion point of the crane pipe, trigger the sensor signal to the control system, and the control system issues a command to control the valve to perform the closing action to complete the closure of the crane pipe. This method is costly, complex to control, and requires an external power source, which is usually not available during field operations. A new type of hydraulically driven crane pipe is disclosed in the patent document with announcement number CN 216105984 U. This crane pipe relies on manual judgment of the liquid level of the medium in the tank, and then manually closes the valve on the crane pipe to complete the operation. This filling method has a large error in the delivery of oil and is prone to causing overflow of the medium in the tank.

[0004] Therefore, how to accurately complete the closing of the crane pipe without a power source is an urgent problem to be solved. Summary of the invention

[0005] The utility model aims to provide a self-sealing crane pipe for a tank truck to solve the corresponding deficiencies of the prior art. The crane pipe can prevent the medium in the tank truck from overflowing without the help of external force.

[0006] The purpose of the utility model is achieved by adopting the following scheme: a self-sealing crane pipe for an oil tanker, comprising an upper crane pipe, the upper crane pipe comprising a first oil pipe, a second oil pipe, and an insert pipe, the oil inlet end of the first oil pipe is connected to a venturi tube through a rotating joint, the lower end of the venturi tube is fixedly connected to the outlet end of a high liquid level valve, the second oil pipe is rotatably connected to the first oil pipe, the insert pipe is rotatably connected to the second oil pipe, and is used to extend into the oil tank, a control pilot valve is located on one side of the high liquid level valve and is connected to the high liquid level valve, the control pilot valve is connected to the venturi tube through a vent pipe, an overflow pipe and an exhaust pipe are arranged on the outside of the insert pipe, the control pilot valve is respectively connected to the overflow pipe and the exhaust pipe, the end of the exhaust pipe is connected to an exhaust valve, and the overflow pipe extends over the oil outlet end of the insert pipe to reach the bottom of the oil tank.

[0007] A knife plate is arranged between the first oil pipe and the second oil pipe, a mounting groove is arranged at the upper end of the knife plate, a hinged plate is arranged in the mounting groove, a balancing cylinder for supporting the second oil pipe is hinged at the front end of the hinged plate, a balancing cylinder mounting seat is arranged at the front end of the balancing cylinder, the balancing cylinder is installed in the balancing cylinder mounting seat, and the lower end of the balancing cylinder mounting seat is connected and fixed to the second oil pipe.

[0008] The balancing cylinder is a piston cylinder, which includes a piston rod inside the balancing cylinder, and the piston rod is connected and fixed with a spring.

[0009] The exhaust pipe is connected to one end of the gas circuit of the control pilot valve, the overflow pipe is connected to one end of the liquid circuit of the control pilot valve, the other end of the gas circuit in the control pilot valve is connected to the venturi tube through the ventilation pipe, and the other end of the liquid circuit in the control pilot valve is connected to one side of the high liquid level valve.

[0010] The exhaust valve connected to the end of the exhaust pipe is close to the top of the oil tank and is located above the oil level in the oil tank.

[0011] The first oil pipe is connected to the venturi through a riser at its lower side.

[0012] The first oil pipe is connected to the riser through a rotary joint, the first oil pipe is connected to the second oil pipe through a rotary joint, and the second oil pipe is connected to the insertion pipe through a rotary joint.

[0013] The utility model has the advantages that it does not require an external power source, but relies on the conveying medium in the crane pipe as power, and automatically cuts off the conveying channel in the crane pipe after the medium in the tank truck reaches the set high liquid level, thus preventing the medium in the tank truck from overflowing without the help of external force. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model. DETAILED DESCRIPTION

[0015] like Figure 1As shown, a self-sealing crane pipe for a tanker truck includes an upper crane pipe 6, wherein the upper crane pipe 6 includes a first oil pipe 63, a second oil pipe 65, and an insert pipe 66. The oil inlet end of the first oil pipe 63 is connected to a venturi tube 2 through a riser 61, and the lower end of the venturi tube 2 is fixedly connected to the outlet end of a high liquid level valve 1. The second oil pipe 65 is rotatably connected to the first oil pipe 63, and the insert pipe 66 is rotatably connected to the second oil pipe 65 for extending into the oil tank 9. A knife plate 10 is arranged between the first oil pipe 63 and the second oil pipe 65, and a mounting groove is arranged at the upper end of the knife plate 10. A hinged plate is arranged in the mounting groove. A balancing cylinder 64 for supporting the second oil pipe 65 is hinged at the front end of the hinged plate. A balancing cylinder mounting seat 11 is arranged at the front end of the balancing cylinder 64. The balancing cylinder 64 is installed in the balancing cylinder mounting seat 11, and the lower end of the balancing cylinder mounting seat 11 is fixedly connected to the second oil pipe 65. The balance cylinder 64 is a piston cylinder, and the balance cylinder 64 includes a piston rod inside the cylinder, and the piston rod is connected and fixed with a spring. A control pilot valve 3 is located on one side of the high liquid level valve 1 and is connected to the high liquid level valve 1. The control pilot valve 3 is connected to the venturi tube 2 through the vent pipe 8. An overflow pipe 5 and an exhaust pipe 4 are arranged outside the insertion tube 66. The control pilot valve 3 is connected to the overflow pipe 5 and the exhaust pipe 4 respectively. The exhaust pipe 4 is connected to one end of the gas circuit of the control pilot valve 3, and the overflow pipe 5 is connected to one end of the liquid circuit of the control pilot valve 3. The other end of the gas circuit in the control pilot valve 3 is connected to the venturi tube 2 through the vent pipe 8, and the other end of the liquid circuit in the control pilot valve 3 is connected to one side of the high liquid level valve 1. The end of the exhaust pipe 4 is connected to an exhaust valve 7, and the overflow pipe 5 extends through the oil outlet end of the insertion tube 66 to reach the bottom of the oil tank 9. The exhaust valve 7 connected to the end of the exhaust pipe 4 is close to the top of the oil tank 9 and is located above the oil level in the oil tank 9. The first oil pipe 63 is connected to the standpipe 61 through a rotary joint 62, the first oil pipe 63 is connected to the second oil pipe 65 through a rotary joint 62, and the second oil pipe 65 is connected to the insertion pipe 66 through a rotary joint 62. The inlet of the high liquid level valve 1 is connected to a flange of a joint through bolts, and the flange is fixedly installed on a lifting mechanism through bolts. When the lifting pipe is used, the joint is connected to the joint of the fixed pipeline through a hose and then used.

[0016] When oil is being delivered, the control pilot valve switch is turned on. At this time, the steel ball locking mechanism in the control pilot valve is in a locked state, so that the control pilot valve core remains in an open state. At this time, the overflow channel at the rear end of the high liquid level valve core is in an open state. When the medium flows through the high liquid level valve core, the medium pushes the valve core open because there is no pressure behind the valve core. The medium flows through the high liquid level valve and then passes through the venturi. The channel at the venturi becomes narrower, forming a low pressure area. At this time, the venturi is replenished with air through the venturi. During the refueling process, the overflow valve is always in an open state. When the liquid level in the oil tank reaches the set height, under the action of the liquid, the exhaust valve at the end of the venturi is closed, and the external gas cannot enter the venturi through the venturi. Negative pressure is formed at the venturi. Under the action of negative pressure, the diaphragm mechanism on the control pilot valve is driven, so that the steel ball locking mechanism of the control pilot valve is unlocked, and the valve core of the control pilot valve is in an unlocked state. The control pilot valve core is reset under the action of elastic force, so that the overflow channel at the rear end of the high liquid level valve core is closed. At this time, the pressure before and after the valve core of the high liquid level valve is quickly balanced through the throttle hole on the valve core, and the valve core of the high liquid level valve quickly returns to the sealing surface under the elastic force of the valve core, so that the high liquid level valve is closed.

[0017] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A self-sealing crane pipe for a tank truck, comprising an upper crane pipe (6), characterized in that: The upper loading crane pipe (6) comprises a first oil pipe (63), a second oil pipe (65), and an insert pipe (66); the oil inlet end of the first oil pipe (63) is connected to a venturi tube (2) via a rotary joint (62); the lower end of the venturi tube (2) is fixedly connected to the outlet end of a high liquid level valve (1); the second oil pipe (65) is rotatably connected to the first oil pipe (63); the insert pipe (66) is rotatably connected to the second oil pipe (65) and is used to extend into the oil tank (9); a control guide The valve (3) is located on one side of the high liquid level valve (1) and is connected to the high liquid level valve (1). The control pilot valve (3) is connected to the venturi tube (2) through a vent pipe (8). An overflow pipe (5) and an exhaust pipe (4) are arranged outside the insertion pipe (66). The control pilot valve (3) is connected to the overflow pipe (5) and the exhaust pipe (4) respectively. The end of the exhaust pipe (4) is connected to an exhaust valve (7). The overflow pipe (5) extends through the oil outlet end of the insertion pipe (66) to reach the bottom of the oil tank (9).

2. The self-sealing crane pipe for a tanker according to claim 1 is characterized in that: A knife plate (10) is arranged between the first oil pipe (63) and the second oil pipe (65); a mounting groove is arranged at the upper end of the knife plate (10); a hinged plate is arranged in the mounting groove; a balancing cylinder (64) for supporting the second oil pipe (65) is hingedly connected at the front end of the hinged plate; a balancing cylinder mounting seat (11) is arranged at the front end of the balancing cylinder (64); the balancing cylinder (64) is mounted in the balancing cylinder mounting seat (11); and the lower end of the balancing cylinder mounting seat (11) is connected and fixed to the second oil pipe (65).

3. The self-sealing crane pipe for a tanker according to claim 2 is characterized in that: The balancing cylinder (64) is a piston cylinder, and the balancing cylinder (64) includes a piston rod inside the cylinder, and the piston rod is connected and fixed to a spring.

4. The self-sealing crane pipe for a tanker according to claim 1 is characterized in that: The exhaust pipe (4) is in communication with one end of the gas circuit of the control pilot valve (3), the overflow pipe (5) is in communication with one end of the liquid circuit of the control pilot valve (3), the other end of the gas circuit in the control pilot valve (3) is in communication with the venturi (2) via the vent pipe (8), and the other end of the liquid circuit in the control pilot valve (3) is in communication with one side of the high liquid level valve (1).

5. The self-sealing crane pipe for a tanker according to claim 1 is characterized in that: The exhaust valve (7) connected to the end of the exhaust pipe (4) is close to the top of the oil tank (9) and is located above the level of the oil in the oil tank (9).

6. The self-sealing crane pipe for a tanker according to claim 1 is characterized in that: The first oil pipe (63) is connected to the venturi tube (2) via a riser (61) at its lower portion.

7. The self-sealing crane pipe for a tanker according to claim 1 is characterized in that: The first oil pipe (63) is connected to the standpipe (61) via a rotating joint (62), the first oil pipe (63) is connected to the second oil pipe (65) via a rotating joint (62), and the second oil pipe (65) is connected to the insertion pipe (66) via a rotating joint (62).

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