Continuous flame cutting experiment device and use method thereof

Abstract

The invention provides a continuous flame cutting experiment device and a use method thereof. The device comprises a power supply unit, an oxygen supply unit, a cutting rope storage unit, a guide wheel, a straightening unit, a traction unit and a packaging platform, and a plurality of mounting grooves are formed in the packaging platform. The experimental device meets the requirements of testing influence factors of the transmission speed, the transmission effect and the combustion speed of the cutting rope and testing the adaptability of the transmission speed and the combustion speed, and is high in integration degree; the test efficiency is higher, the requirement on personnel operation is reduced, and the test is more convenient and flexible; the test result is more accurate, datamation can be realized, data support is provided for development and improvement of the device, and a practical method and theoretical guidance are formed.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas well emergency rescue operations. Specifically, it relates to a continuous flame cutting experimental device and its usage method. Background Art

[0002] Currently, in oil and gas well emergency rescue operations, when conventional wrenches cannot remove the flange connection bolts of the wellhead device, a burning rod is usually used for cutting. The traditional burning rod cutting device has problems such as discontinuous fuel supply, which affects the operation efficiency, and the operators need to operate at close range, resulting in high danger. There is an urgent need to develop a continuous flame cutting device that can continuously supply fuel and can be remotely operated.

[0003] Previously, there was no experimental device that could meet the development and testing requirements of continuous flame cutting devices. The development and testing mainly relied on manual judgment and personnel experience, and there were mainly the following drawbacks: ① Strong dependence on manual labor, low completion efficiency. The testing was based on personal observation and judgment, with low completion efficiency. Due to the strong dependence on manual labor and the large differences in personnel technical levels, the test results were greatly affected by human factors, and the test errors were large. ② Difficult to digitalize, unable to provide theoretical guidance for equipment research and development. Manual testing was completely based on experience judgment. There were many factors affecting the test results, making it difficult to digitalize, and unable to provide data support for the development and improvement of the device and form practical methods and theoretical guidance.

[0004] Therefore, it is of great significance to study an experimental device for the development and testing of continuous flame cutting devices. Summary of the Invention

[0005] The purpose of the present invention is to solve at least one of the above-mentioned deficiencies existing in the prior art. For example, one of the purposes of the present invention is to provide a testing device for the research and development, optimization and improvement of a continuous flame cutting device. The second purpose of the present invention is to test the influencing factors of the cutting rope transmission speed, transmission effect and burning speed. The third purpose of the present invention is to test the adaptability between the transmission speed and the burning speed, providing technical and data support for the development, optimization and improvement of the continuous flame cutting device.

[0006] To achieve the above purpose, on the one hand, the present invention provides a continuous flame cutting experimental device, which includes a power supply unit, an oxygen supply unit, a cutting rope storage unit, a guide wheel, a straightening unit, a traction unit and a container platform; a plurality of installation slots are opened on the container platform.

[0007] Optionally, the power supply unit includes a storage battery, an arc striking plate and a cable.

[0008] Optionally, the storage battery is a DC storage battery.

[0009] Optionally, the oxygen supply unit includes an industrial oxygen cylinder, a pressure regulator, and an oxygen hose.

[0010] Optionally, the straightening unit includes a straightening module and multiple pairs of straightening wheels, and the straightening unit is adjusted by a straightening unit turntable;

[0011] The straightening module includes a horizontal straightening module and a vertical straightening module.

[0012] Optionally, the traction unit includes a stepper motor, a traction wheel, rollers, and a crawler.

[0013] Optionally, the guide wheel guides the cutting rope and realizes the change of the transmission angle of the cutting rope.

[0014] Optionally, the container platform can integrate the guide wheel, the straightening unit, and the traction unit through the installation groove;

[0015] The installation grooves have different lengths and equal widths, and can realize the position adjustment of each unit.

[0016] On the other hand, the present invention provides a method for using a continuous flame cutting experimental device, where the experimental device is the above-mentioned experimental device, and the method includes using the experimental device to test the influencing factors of the cutting rope transmission effect;

[0017] Using the experimental device to test the relationship between the transmission speed of the cutting rope, the oxygen pressure and the cutting effect, and the adaptability between the burning speed of the cutting rope and the traveling speed.

[0018] Optionally, the influencing factors for testing the cutting rope transmission effect include the influence of the number of straightening wheel groups on the straightening effect;

[0019] The influence of the position change of the straightening unit and the traction unit on the cutting rope transmission effect;

[0020] The influence of the cutting rope angle change on the cutting rope transmission effect.

[0021] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0022] 1) The experimental device of the present invention meets the test requirements of the influencing factors of the cutting rope transmission speed, transmission effect and burning speed, as well as the adaptability test of the transmission speed and the burning speed, and the device has a high integration degree.

[0023] 2) The experimental device adopted by the present invention has a higher test efficiency, reduces the requirements for personnel operation, and the test is more convenient and flexible.

[0024] 3) The test results of the present invention are more accurate, can be digitalized, provide data support for the development and improvement of the device, and form practical methods and theoretical guidance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Through the following description with reference to the drawings, the above and other objects and / or features of the present invention will become more apparent, wherein:

[0026] Figure 1 Fig. shows a schematic diagram of the overall structure of the continuous flame cutting experimental device in Example 1 of the present invention.

[0027] Figure 2 Fig. shows a schematic top view of the lateral straightening module structure of the straightening unit in Example 1 of the present invention.

[0028] Figure 3 Fig. shows a schematic front view of the structure of the traction unit in Example 1 of the present invention.

[0029] Figure 4A Fig. shows a schematic front view of the structure of the guide wheel in Example 1 of the present invention.

[0030] Figure 4B Fig. shows a schematic top view of the structure of the guide wheel in Example 1 of the present invention

[0031] Figure 5 Fig. shows a top view structural diagram of the experimental device container platform in Example 1 of the present invention.

[0032] Description of the main reference numerals:

[0033] 1 - power supply unit; 2 - oxygen supply unit; 3 - cutting rope storage unit; 4 - guide wheel; 5 - straightening unit; 6 - traction unit; 7 - container platform; 8 - cutting rope; 9 - adjusting turntable; 10 - straightening wheel; 11 - traction wheel; 12 - roller; 13 - crawler; 14 - adjusting turntable; 15 - installation groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] In the following, the continuous flame cutting experimental device of the present invention and its usage method will be described in detail with reference to exemplary embodiments.

[0035] Exemplary Embodiment 1

[0036] This exemplary embodiment provides a continuous flame cutting experimental device, which includes a power supply unit, an oxygen supply unit, a cutting rope storage unit, a guide wheel, a straightening unit, a traction unit and a container platform; a plurality of installation grooves are formed on the container platform.

[0037] In this embodiment, the main function of the power supply unit is to provide the electric energy required for ignition. It can be composed of a 24V DC battery, an arc ignition plate and a cable. When the cutting rope is transmitted to an appropriate distance from the object to be cut, it can strike an arc to ignite the cutting rope. The main function of the oxygen supply unit is to supply oxygen for combustion support. It can be composed of an industrial oxygen cylinder, a pressure regulator and an oxygen hose. The oxygen pressure is changed through the pressure regulator, and the cutting effect under different oxygen pressures and the influence of different oxygen pressures on the burning speed of the cutting rope are observed.

[0038] The cutting rope storage unit guarantees the continuous supply of the cutting rope; in addition to guiding the transmission of the cutting rope, the guide wheel can also change the transmission angle of the cutting rope by changing the relative position of the guide wheel, so as to test the influence of the cutting rope angle change on the transmission speed.

[0039] In this embodiment, the straightening unit can be composed of a set of horizontal straightening modules and a set of vertical straightening modules. The horizontal straightening module and the vertical straightening module have the same structure, but only the placement postures are different. The horizontal straightening unit is placed flat, and the vertical straightening unit is vertically placed on the container platform surface; each set of straightening modules can have 3-5 pairs of straightening wheels. The main function is to straighten the cutting rope to ensure the straightness of the end of the cutting rope. By adjusting the turntable of the straightening unit, the position of the straightening wheels can be finely adjusted, so as to press the cutting rope and ensure the straightening effect. The number of groups of straightening wheels can also be adjusted to test the straightening effects of different numbers of groups of straightening wheels, and the number of groups of straightening wheels with the best straightening effect is preferably selected.

[0040] The traction unit can be used as both the traction mechanism for cutting rope straightening and the feeding mechanism for the cutting rope. It can be composed of a stepping motor equipped with 2 sets of traction wheels, 4 sets of rollers and 2 sets of crawlers. The stepping motor provides power to drive the rollers and guide wheels to rotate, so as to drive the crawlers to traction the cutting rope to move linearly. The traction unit can drive the cutting rope to move forward and backward. The stepping motor is equipped with a data display box that can display the motor frequency.

[0041] When the cutting rope is sent out from the traction unit and reaches an appropriate position from the object to be cut, it can strike an arc to ignite the cutting rope; the experimental device container platform integrates the guide wheel, the straightening unit and the traction unit. The platform surface is provided with installation grooves with different lengths and equal widths for installing each unit. By installing each unit at different grooved positions, the position adjustment of each mechanism can be realized.

[0042] Exemplary Embodiment 2

[0043] The present exemplary embodiment provides a method for using an experimental device for continuous flame cutting. The experimental device is the one described in Exemplary Embodiment 1. The method includes: using the experimental device to test the influencing factors of the cutting rope transmission effect; using the experimental device to test the relationship between the transmission speed of the cutting rope, the oxygen pressure and the cutting effect, and the compatibility between the burning speed and the traveling speed of the cutting rope.

[0044] In this embodiment, the influencing factors for testing the cutting rope transmission effect include the influence of the number of straightening wheel groups on the straightening effect, the influence of the position change between the straightening unit and the traction unit on the cutting rope transmission effect, and the influence of the cutting rope angle change on the cutting rope transmission effect.

[0045] To better understand the above exemplary embodiment of the present invention, the following further illustrates it with specific examples.

[0046] Example 1

[0047] This example provides a test scheme for the influencing factors of the cutting rope transmission effect of an experimental device for continuous flame cutting. The test contents include: the influence of the number of straightening wheel groups on the straightening effect, the influence of the position change between the straightening mechanism and the traction mechanism on the cutting rope transmission effect, and the influence of the cutting rope angle change on the cutting rope transmission effect.

[0048] The overall structure of the experimental device for continuous flame cutting is as Figure 1 shown. The power supply unit 1 and the oxygen supply unit 2 are respectively connected to the same end of the cutting rope storage unit 3. The other end of the cutting rope storage unit 3 is successively a guide wheel 4, a straightening unit 5 and a traction unit 6, and all the straightening wheels of the straightening unit 5 are installed in place. Figure 4A is the front view of the guide wheel, Figure 4B is the top view of the guide wheel.

[0049] In this example, after pressing the power button of the stepping motor in the traction unit 6, the cutting rope 8 starts to travel, passes through the guide wheel 4, the straightening unit 5 and the traction unit 6 in sequence, and observes and records the straightening effect after the cutting rope 8 extends out of the traction unit 6. Gradually reduce the number of straightening wheels 10, observe and record the straightening effect under different numbers of straightening wheels, and the group with the best straightening effect can be selected.

[0050] Figure 2 is the schematic top view of the horizontal straightening module structure of the straightening unit, as Figure 1 and Figure 2 shown. The straightening unit 5 is controlled by operating the adjustment turntable 9, and the number of straightening wheels 10 is adjustable.

[0051] Figure 3 is the schematic front view of the traction unit structure, as Figure 1 and Figure 3As shown in the figure, the traction unit 6 has two sets of traction wheels 11 arranged on both sides, and 4 sets of rollers 12 are arranged between each set of traction wheels 11. The crawler 13 is wound around the outside of the traction wheels 11, and the adjustment turntable 14 is arranged on the upper surface of the traction unit 6.

[0052] The traction unit 6 is in the front and the straightening unit 5 is in the back. Press the motor power key. There is a data display box on the stepping motor panel, which can display the motor frequency. Select the motor frequency, observe and record the transmission effect of the cutting rope 8. Swap the positions of the traction unit 6 and the straightening unit 5, with the straightening unit 5 in the front and the traction unit 6 in the back, observe and record the transmission effect of the cutting rope 8, and determine the connection sequence when the transmission effect is the best at the same motor frequency.

[0053] The cutting rope 8 is wound on the cutting rope reel, resulting in a certain degree of bending of the cutting rope 8, and the cutting rope 8 needs to be straightened. Only connect the traction unit 6 and the guide wheel 4. When leaving the metal guide tube by about 10 cm, the end of the burning rope begins to sag by about 5 - 10°, affecting the control of the cutting position. After connecting the straightening unit 5, it begins to sag by 5 - 10° at about 15 cm. The better the straightening effect, the longer the horizontal distance the cutting rope 8 maintains after exiting the metal conduit, and the easier it is to control the cutting position.

[0054] The number of straightening wheel groups with the best straightening effect measured by the above experimental steps and the connection sequence of the traction unit 6 and the straightening unit 5 when the transmission effect is the best. By changing the installation position of the guide wheel 4 to achieve the change of the transmission angle of the cutting rope, test the transmission effect and the stuck angle of the cutting rope at different transmission angles, and the maximum angle adjustment range of the cutting rope can be determined.

[0055] Figure 5 It is a top view structure diagram of the integrated platform of the continuous flame cutting experimental device. As Figure 1 and Figure 5 shown, the integrated platform 7 is provided with installation grooves 15 with different lengths and the same width, which can realize the position change of each unit on the integrated platform 7.

[0056] Example 2

[0057] Select the number of straightening wheel groups with the best straightening effect in Example 1, adopt the connection sequence of the straightening mechanism and the traction mechanism when the transmission effect is the best, and connect the experimental device. Press the stepping motor power key, adjust the motor frequency, and record the transmission speed of the cutting rope at different frequencies. The specific implementation process includes: adjust the motor frequency to 1, time for 1 minute, record the transmission distance of the cutting rope, and obtain the transmission speed of the cutting rope when the motor frequency is 1. Use the same method to obtain the transmission speeds of the cutting rope when the motor frequencies are 2, 3, 4, etc.

[0058] The conveying speed of the cutting rope is different at different frequencies corresponding to different motor models. The result obtained in this example is the conveying speed of the cutting rope corresponding to each different motor frequency, and only the corresponding relationship between the motor frequency and the conveying speed is obtained.

[0059] Example 3

[0060] On the basis of Example 1, the cutting rope starts to move. When the cutting rope reaches a position 5 - 10 cm away from the object to be cut, it scratches to strike an arc, ignites the cutting rope, and conducts a cutting effect test to preferably obtain the oxygen pressure when the cutting effect is the best.

[0061] Example 4

[0062] Adopt the oxygen pressure preferably selected in Example 3 and keep the pressure unchanged. Press the power key of the stepping motor. According to the test results of Example 2, it is convenient for the operator to more intuitively know the conveying speed through the motor frequency and select the appropriate motor frequency, that is, the speed corresponding to the frequency. The cutting rope starts to move. When the cutting rope reaches 5 - 10 cm away from the object to be cut, it scratches to strike an arc, ignites the cutting rope, and observe the adaptability between the transmission speed and the burning speed of the cutting rope. According to the burning situation, adjust the motor frequency. If the burning speed is greater than the transmission speed, the motor frequency needs to be increased. If the burning speed is less than the transmission speed, the motor frequency needs to be decreased. Finally, preferably obtain the motor frequency that is most suitable for the oxygen pressure.

[0063] Increase the oxygen pressure and keep this pressure unchanged, repeat the above experimental steps, and finally a set of matching value tables of oxygen pressure and motor frequency can be obtained.

[0064] Example 5

[0065] Test the influence of the number of straightening wheel groups on the straightening effect: all the straightening wheels of the straightening mechanism are installed in place. Press the power key of the stepping motor, and the cutting rope starts to move and passes through the guide wheel, the straightening mechanism and the traction mechanism in sequence. Observe and record the straightening effect of the cutting rope after it extends out of the traction mechanism; gradually reduce the number of straightening wheel groups, and observe and record the straightening effect under different numbers of straightening wheel groups.

[0066] Test the influence of the position change between the straightening mechanism and the traction mechanism on the transmission effect of the cutting rope: with the traction mechanism in the front and the straightening mechanism in the back, press the power key of the motor. There is a data display box on the stepping motor panel that can display the motor frequency. Select the motor frequency, observe and record the transmission effect of the cutting rope. Swap the positions of the traction mechanism and the straightening mechanism, with the straightening mechanism in the front and the traction mechanism in the back, and observe and record the transmission effect of the cutting rope. Finally, it is tested that when the cutting rope passes through the traction mechanism first at the same motor frequency, the transmission effect is better.

[0067] Test the influence of the change of the cutting rope angle on the transmission effect of the cutting rope: By changing the installation position of the guide wheel to achieve the change of the transmission angle of the cutting rope, test the transmission effect at different transmission angles, as well as the stuck angle of the cutting rope. When the transmission angle is measured to be 100°, the transmission of the cutting rope shows a jamming phenomenon.

[0068] Test the transmission speed of the cutting rope: Adjust the motor frequency to 1 and time for 1 minute, record the transmission distance of the cutting rope, and obtain the transmission speed of the cutting rope when the motor frequency is 1. Use the same method to obtain the transmission speeds of the cutting rope when the motor frequencies are 2, 3, 4, etc. respectively. Through testing, adding a transmission conduit and not adding a transmission conduit have an impact on the transmission speed, but the impact is not significant.

[0069] Test the relationship between the oxygen pressure and the cutting effect: Press the power key of the stepping motor. According to the test results of Example 2, select a suitable motor frequency. The cutting rope starts to move forward. When the cutting rope reaches a suitable position from the object to be cut, scratch and arc to ignite the cutting rope and conduct a cutting effect test to optimize the oxygen pressure when the cutting effect is the best. It is obtained through testing that when the oxygen pressure is lower than 1.25 Mpa, the cutting force is insufficient; when the oxygen pressure is 1.25 Mpa, the cutting effect is the best.

[0070] Test the adaptability between the burning speed and the traveling speed of the cutting rope: Adopt the above-optimized oxygen pressure, that is, 1.25 Mpa. According to the test results of Example 2, select a motor frequency that is relatively close to conduct the adaptability verification of the oxygen pressure and the motor frequency (i.e., the transmission speed of the cutting rope). It is tested that when the cutting surface remains unchanged, when the motor frequency is 8, the cutting speed and the burning speed are the most adaptable; if the cutting point moves backward with the cutting, then when the oxygen pressure is 1.25 Mpa and the motor frequency is 9, the cutting speed and the burning speed are the most adaptable.

[0071] Although the present invention has been described above in conjunction with the exemplary embodiments and the accompanying drawings, those of ordinary skill in the art should understand that various modifications can be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. A continuous flame cutting experimental device, characterized in that, The device includes a power supply unit, an oxygen supply unit, a cutting rope storage unit, a guide wheel, a straightening unit, a traction unit, and a container platform; a plurality of installation slots are provided on the container platform.

2. The experimental device according to claim 1, characterized in that, The power supply unit includes a storage battery, an arc striking plate, and a cable.

3. The experimental device according to claim 2, characterized in that, The storage battery is a DC storage battery.

4. The experimental device according to claim 1, characterized in that, The oxygen supply unit includes an industrial oxygen cylinder, a pressure regulator, and an oxygen hose.

5. The experimental device according to claim 1, characterized in that The straightening unit includes a straightening module and multiple pairs of straightening wheels, and the straightening unit is adjusted and operated by a straightening unit turntable; The straightening module includes a horizontal straightening module and a vertical straightening module.

6. The experimental device according to claim 1, characterized in that, The traction unit includes a stepping motor, a traction wheel, rollers, and a crawler.

7. The experimental device according to claim 1, characterized in that, The guide wheel guides the cutting rope and can realize the change of the transmission angle of the cutting rope.

8. The experimental device according to claim 1, characterized in that, The container platform can integrate the guide wheel, the straightening unit, and the traction unit through the installation slots; The installation slots have different lengths and equal widths, and can realize the position adjustment of each unit.

9. A method for using a continuous flame cutting experimental device, characterized in that the experimental device is the experimental device according to any one of claims 1-8, and the method includes using the experimental device to test the influencing factors of the cutting rope transmission effect; Using the experimental device to test the relationship between the transmission speed of the cutting rope, the oxygen pressure and the cutting effect, and the compatibility between the burning speed and the traveling speed of the cutting rope.

10. The usage method according to claim 9, characterized in that, The influencing factors for testing the cutting rope transmission effect include the influence of the number of straightening wheel groups on the straightening effect; The influence of the position change between the straightening unit and the traction unit on the cutting rope transmission effect; The influence of the cutting rope angle change on the cutting rope transmission effect.

Images