A portable underwater low-temperature cutting machine and cutting method thereof

Abstract

The invention discloses a portable underwater low-temperature cutting machine and a cutting method thereof, comprising a box-shaped main body, a clamping device at the lower part of the box-shaped main body, a cooling device at the front of the box-shaped main body, a cutting device at the lower part of the cooling device and a height-adjusting device at the lower part of the cutting device; the clamping device comprises a clamping block, a baffle plate at the upper part of the clamping block and support columns inserted at both ends of the clamping block; the cutting device comprises an electric cylinder fixed at the lower part of one side of the box-shaped main body, a waterproof motor located above the electric cylinder, a ball screw fixedly connected to the electric cylinder, a push rod fixedly connected to the ball screw and an impact hammer fixed at the front end of the push rod; the cooling device comprises a booster tank located at one side of the electric cylinder and installed on the clamping block, a slideway installed at the upper part of the clamping block, a suction nozzle connected to the booster tank and a crank slider mechanism, wherein the slider end of the crank slider mechanism is connected to the suction nozzle; the device is small in size, easy to operate underwater and easy to carry; liquid nitrogen cooling embrittles the device and the cutting is safe.

Description

Technical Field

[0001] The invention relates to the technical field of underwater cutting equipment, and specifically discloses a portable underwater low-temperature cutting machine and a cutting method thereof. Background Art

[0002] With the advent of the era of globalization and economic integration, the industrial urbanization process of various countries has accelerated, and traditional energy can no longer meet the energy needs of all walks of life in the world today. Countries around the world have begun to attach great importance to the exploration and development of marine oil and gas resources. Now, with the passage of time and the depletion of resources, offshore pile foundation platforms have gradually completed their historical mission. The cutting of abandoned offshore pile foundation platforms is an extremely complex and dangerous task. The site of this work is located at sea and close to flammable substances such as oil and gas. Any carelessness will cause serious accidents such as explosions or pollution.

[0003] Although there are many types of underwater cutting technologies, they can be roughly divided into two categories according to their basic principles and cutting states, namely underwater thermal cutting and underwater cold cutting. The commonly used underwater cutting technologies are thermal cutting methods, which make high-temperature molten steel pipes complete cutting. Due to the thermal effect and sparks generated during cutting, the properties of the cutting material will be changed, and it cannot be used in flammable and explosive working environments. However, it is extremely dangerous to dismantle offshore oil platforms and cut submarine oil pipelines, which poses great safety hazards. Cold cutting avoids these problems. Commonly used cold cutting technologies include high-pressure water jet cutting and diamond wire saw cutting. High-pressure water jet cutting requires a high-pressure source, which is costly, and the high-pressure water jet has a great impact force. Directly spraying it on the human body will cause great harm, and it must be frequently overhauled to achieve good results. The diamond wire saw cutting method is more complicated to operate, resulting in incomplete cutting, which is easy to damage the lifting equipment and barges. According to the cutting capacity and size of different diamond beaded curved saws, special fixtures and rigging need to be designed and manufactured for them.

[0004] Considering the safety of underwater divers, these machines are usually driven hydraulically. Since the machines are used underwater, the hydraulic power source is on the ship and connected to the tools through oil pipes. As the operating depth increases, the load of the dragged oil pipe will increase. Therefore, it is not flexible and convenient for divers to use hydraulic tools underwater, which reduces the operating efficiency. Summary of the invention

[0005] In view of this, in order to solve the problems that the existing underwater cold cutting machines are not flexible, convenient, safe, costly and have low operating efficiency, the present invention provides a portable underwater low-temperature cutting machine and a cutting method thereof that is safe, easy to carry, simple in structure and low in cost.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A portable underwater low-temperature cutting machine comprises a box-shaped body, a clamping device at the bottom of the box-shaped body, a cooling device at the front of the box-shaped body, a cutting device at the bottom of the cooling device, and a height adjustment device at the bottom of the cutting device;

[0008] The clamping device includes a clamping block, a baffle plate on the upper part of the clamping block, support columns with protrusions inserted at both ends of the clamping block, and a cross column stuck in the protrusions of the support columns. The baffle plate is installed on the support column, and a cam mechanism is provided in the clamping block.

[0009] The cutting device includes an electric cylinder fixed at the lower part of one side of the box-shaped body, a waterproof motor located above the electric cylinder, a ball screw fixedly connected to the electric cylinder, a push rod fixedly connected to the ball screw, and a striker fixed at the front end of the push rod, and the waterproof motor is connected to the electric cylinder through a synchronous belt transmission;

[0010] The cooling device includes a booster tank located at one side of the electric cylinder and mounted on the clamping block, a slideway mounted on the upper part of the clamping block, a suction nozzle connected to the booster tank and a crank slider mechanism, the slider end of the crank slider mechanism is connected to the suction nozzle, the suction nozzle is mounted on the slideway, and a plurality of electromagnets are arranged in the suction nozzle;

[0011] The height-adjusting device comprises a worm gear screw mechanism which is located below the electric cylinder and fixedly connected to the electric cylinder, and a height-adjusting motor which is connected to the worm gear screw mechanism.

[0012] Furthermore, the clamping block is V-shaped, and there are two baffles. Beneficial effect: The V-shaped clamping block is convenient for clamping the steel pipe.

[0013] Furthermore, a spring is installed under the horizontal column. Beneficial effect: The spring can buffer and reduce vibration of the pressing action and has a reset effect.

[0014] Furthermore, the suction nozzle is arc-shaped and is externally connected to a liquid nitrogen device, and four electromagnets are arranged in the suction nozzle. Beneficial effect: The suction nozzle is controlled by the electromagnet to suck the surface of the steel pipe.

[0015] Furthermore, the suction nozzle is connected to the booster tank via a hose.

[0016] Furthermore, the worm gear screw mechanism is connected to the height adjustment motor via a coupling.

[0017] Furthermore, a handle integrally formed with the clamping block is provided at the lower portion of the clamping block.

[0018] Furthermore, a clamping button is provided on the clamping device, and a height adjustment button is provided on the height adjustment device.

[0019] Furthermore, it also includes an ROV remote control module. Beneficial effect: Under extremely harsh working environment, the cutting is completed by controlling the device through the ROV remote control module.

[0020] A cutting method using a portable underwater cryogenic cutting machine comprises the following steps:

[0021] S1: When arriving at the work station, push open the baffle, clamp the steel pipe into the V-shaped clamping block, press the clamping button, and automatically clamp the steel pipe;

[0022] S2: Start the electromagnet, the arc-shaped suction nozzle sucks the steel pipe, the booster tank is pressurized to release liquid nitrogen, complete cooling, and make the steel pipe embrittled; if the cooling is incomplete, adjust the position of the suction nozzle and repeat the operation;

[0023] S3: Press the height adjustment button, select the appropriate height, impact, and complete the cutting.

[0024] The working principle and beneficial effects of this solution are:

[0025] 1. The portable underwater low-temperature cutting machine disclosed in the present invention is provided with a clamping device, a cooling device, a cutting device and a height adjustment device on a box-shaped main body, so that the device is small in size, easy to operate underwater, and easy to carry. At the same time, liquid nitrogen is released through the cooling device to complete cooling, so that the pipeline is embrittled and easy to cut. It is safe for cutting oil pipelines and flammable gas pipelines, and is environmentally friendly and pollution-free.

[0026] 2. The portable underwater low-temperature cutting machine disclosed in the present invention is driven by an electric cylinder and does not require a hydraulic pipe to transmit pressure to drive the underwater hydraulic motor to rotate. It has a simple structure and low manufacturing cost. The device can also be provided with an ROV remote control module, which can be operated by manual diving or by ROV remote control, and has high operating efficiency.

[0027] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the portable underwater low-temperature cutting machine of the present invention;

[0029] Figure 2 It is a front view of the portable underwater cryogenic cutting machine of the present invention;

[0030] Figure 3 It is a side view of the portable underwater cryogenic cutting machine of the present invention;

[0031] Figure 4 It is a top view of the portable underwater low-temperature cutting machine of the present invention;

[0032] Figure 5It is a front cross-sectional view of the portable underwater cryogenic cutting machine of the present invention;

[0033] Figure 6 It is a schematic diagram of the structure of the cutting device and the height adjustment device in the portable underwater low-temperature cutting machine of the present invention.

[0034] The markings in the accompanying drawings are as follows: support column 1, electromagnet 2, suction nozzle 3, crank slider mechanism 4, slideway 5, cross column 6, cam mechanism 7, impact hammer 8, push rod 9, waterproof motor 10, synchronous belt 11, ball screw 12, worm gear screw mechanism 13, height adjustment motor 14, handle 15, spring 16, electric cylinder 17, clamping block 18, booster tank 19, baffle 20, fastener 21, coupling 22. DETAILED DESCRIPTION

[0035] The following is further described in detail through specific implementation methods:

[0036] Embodiment 1

[0037] like Figure 1-Figure 6 A portable underwater low-temperature cutting machine is shown, comprising a box-shaped body, a clamping device at the bottom of the box-shaped body, a cooling device at the front of the box-shaped body, a cutting device at the bottom of the cooling device and a height adjustment device at the bottom of the cutting device. A clamping button is provided on the clamping device, and a height adjustment button is provided on the height adjustment device.

[0038] The clamping device includes a V-shaped clamping block 18, two baffles 20 on the upper part of the clamping block 18, a support column 1 with protrusions inserted at both ends of the clamping block 18, and a cross column 6 stuck in the protrusions of the support column 1. The baffle 20 is installed on the support column 1, and a cam mechanism 7 is provided in the clamping block 18. The baffle 20 on the V-shaped clamping block 18 clamps the steel pipe synchronously, and the cross column 6 is pushed by the cam mechanism 7. The cross column 6 is stuck in the protrusions of the two support columns 1, driving the support column 1 to move downward, thereby pressing the steel pipe. A spring 16 is installed under the cross column 6, which has a reset function and can also buffer and reduce vibration of the pressing action.

[0039] The cutting device includes an electric cylinder 17 fixed at the lower part of one side of the box-shaped body, a waterproof motor 10 located above the electric cylinder 17, a ball screw fixedly connected to the electric cylinder 17, a push rod 9 fixedly connected to the ball screw 12, and a striker 8 fixed at the front end of the push rod 9. The waterproof motor 10 is connected to the electric cylinder 17 through a synchronous belt 11. The waterproof motor 10 drives the electric cylinder 17 to move quickly, and the waterproof motor 10 drives the synchronous belt 11. The synchronous belt 11 is connected to the ball screw 12, and the rotary motion is converted into linear motion, and the push rod 9 is pushed out. The front end of the push rod 9 is connected to the striker 8, so that the striker 8 has greater kinetic energy, thereby striking the steel pipe. The waterproof motor 10 rotates forward, the push rod 9 is pushed out, the waterproof motor 10 reverses, and the push rod 9 retracts, so that the striker 8 can move back and forth in a straight line.

[0040] The cooling device includes a booster tank 19 located on one side of the electric cylinder 17 and mounted on the clamping block 18, a slideway 5 mounted on the upper part of the clamping block 18, an arc-shaped suction nozzle 3 connected to the booster tank 19 through a hose, and a crank slider mechanism 4. The slider end of the crank slider mechanism 4 is connected to the suction nozzle 3, and the suction nozzle 3 is mounted on the slideway 5. The crank slider mechanism 4 controls the movement of the arc-shaped suction nozzle 3 in the slideway 5. Four electromagnets 2 are arranged in the suction nozzle 3, and the suction nozzle 3 is externally connected to a liquid nitrogen device. When the electromagnet 2 in the arc-shaped suction nozzle 3 is energized, it sucks the surface of the steel pipe, drains the water, disconnects the electromagnet 2, and the booster tank 19 automatically increases the pressure to a certain pressure. The liquid nitrogen is ejected from the suction nozzle 3 through the hose, and the liquid nitrogen is released through the suction nozzle 3 to complete the cooling. The crank slider mechanism 4 is used to adjust the position of the suction nozzle 3.

[0041] The height adjustment device includes a worm gear screw mechanism 13 located below the electric cylinder 17 and fixedly connected to the electric cylinder 17 through a fastener 21, and a height adjustment motor 14 connected to the worm gear screw mechanism 13. The worm gear screw mechanism 13 and the height adjustment motor 14 are connected through a coupling 22. When the height adjustment button is pressed, the height adjustment motor 14 drives the worm gear screw mechanism 13, and the upper section of the screw is connected to the electric cylinder 17, so as to adjust the height to a suitable impact height, and then press the button to stop the height adjustment.

[0042] A handle 15 integrally formed with the clamping block 18 is provided at the lower portion of the clamping block 18 .

[0043] Weld the power cord of the motor in the device firmly, apply insulating paint, wrap several layers of waterproof insulating tape on the outside of the joint, add waterproof wax or solid lubricant to the shaft position to ensure that the circuit cannot be short-circuited.

[0044] Embodiment 2

[0045] The difference between the second embodiment and the first embodiment is that when the working environment is very bad and not suitable for manual operation, an ROV remote control module is added to the device, and a motor is added to the baffle 20 to control the rotation of the baffle 20. The ROV handle is used for direct control, and the ROV brings the device to the designated working position, and the remote control handle is used to control the operation steps similar to those of the above-mentioned embodiment 1.

[0046] The cutting method of a portable underwater low-temperature cutting machine comprises the following steps:

[0047] S1. When the working environment allows manual operation, the diver can dive with the handheld device to perform cutting. When reaching the work station, the baffle 20 is opened, the steel pipe is clamped into the V-shaped clamping block 18, and the clamping button is pressed to automatically clamp the steel pipe.

[0048] S2, start the electromagnet 2, the arc-shaped suction nozzle 3 sucks the steel pipe, and the booster tank 19 releases liquid nitrogen to complete the cooling and make the steel pipe embrittled. If the cooling is incomplete, the position of the suction nozzle 3 can be adjusted, and then the operation can be repeated.

[0049] S3. Press the height adjustment button, select the appropriate height, impact, and complete the cutting.

[0050] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the present invention.

Claims

1. A portable underwater cryogenic cutting machine, characterized in that: It includes a box-shaped body, a clamping device at the bottom of the box-shaped body, a cooling device at the front of the box-shaped body, a cutting device at the bottom of the cooling device, and a height adjustment device at the bottom of the cutting device; The clamping device comprises a clamping block, a baffle plate on the upper part of the clamping block, a support column with protrusions inserted at both ends of the clamping block, and a cross column stuck in the protrusions of the support column, the baffle plate is installed on the support column, and a cam mechanism is provided in the clamping block; The cutting device comprises an electric cylinder fixed at the lower part of one side of the box-shaped body, a waterproof motor located above the electric cylinder, a ball screw fixedly connected to the electric cylinder, a push rod fixedly connected to the ball screw, and a striker fixed at the front end of the push rod, wherein the waterproof motor is connected to the electric cylinder through a synchronous belt transmission; The cooling device includes a booster tank located at one side of the electric cylinder and mounted on the clamping block, a slideway mounted on the upper part of the clamping block, a suction nozzle connected to the booster tank, and a crank slider mechanism, wherein the slider end of the crank slider mechanism is connected to the suction nozzle, the suction nozzle is mounted on the slideway, and a plurality of electromagnets are arranged in the suction nozzle; The height adjustment device comprises a worm gear screw mechanism located below the electric cylinder and fixedly connected to the electric cylinder, and a height adjustment motor connected to the worm gear screw mechanism.

2. The portable underwater cryogenic cutting machine according to claim 1, characterized in that: The clamping block is V-shaped, has two baffles, and the supporting column has protrusions.

3. The portable underwater cryogenic cutting machine according to claim 2, characterized in that: A spring is installed below the cross column.

4. The portable underwater cryogenic cutting machine according to claim 2, characterized in that: The suction nozzle is arc-shaped and externally connected to a liquid nitrogen device, and four electromagnets are arranged in the suction nozzle.

5. The portable underwater cryogenic cutting machine according to claim 4, characterized in that: The suction nozzle is connected to the booster tank via a hose.

6. The portable underwater cryogenic cutting machine according to claim 1, characterized in that: The worm gear screw mechanism is connected to the height adjustment motor through a coupling.

7. The portable underwater cryogenic cutting machine according to claim 1, characterized in that: A handle integrally formed with the clamping block is arranged at the lower part of the clamping block.

8. The portable underwater cryogenic cutting machine according to claim 4, characterized in that: The clamping device is provided with a clamping button, and the height adjusting device is provided with a height adjusting button.

9. The portable underwater cryogenic cutting machine according to claim 1, characterized in that: Also includes ROV remote control module.

10. The cutting method of a portable underwater low-temperature cutting machine according to claim 8, characterized in that: The following steps are involved: S1: When arriving at the work station, push open the baffle, clamp the steel pipe into the V-shaped clamping block, press the clamping button, and automatically clamp the steel pipe; S2: Start the electromagnet, the arc-shaped suction nozzle sucks the steel pipe, the booster tank is pressurized to release liquid nitrogen, complete cooling, and make the steel pipe embrittled; if the cooling is incomplete, adjust the position of the suction nozzle and repeat the operation; S3: Press the height adjustment button, select the appropriate height, impact, and complete the cutting.

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