A controllable vibrator reaction force real-time adjustment system and adjustment method thereof

Abstract

The present invention relates to the technical field of seismic source generators, and in particular to a controllable seismic source reaction force real-time adjustment system and an adjustment method thereof. A controllable seismic source reaction force real-time adjustment system comprises a seismic source servo mechanism and a seismic source reaction force mechanism that provides reaction force for the seismic source servo mechanism, the seismic source servo mechanism comprises a shock plate, the seismic source reaction force mechanism comprises an air spring fixedly connected above the shock plate, a pressure plate connected to the upper end of the air spring, and a seismic source reaction force cylinder connected above the pressure plate, and an electrically controlled overflow valve is installed on the oil inlet pipe of the seismic source reaction force cylinder. The oil pressure in the oil inlet pipe is controlled by the electrically controlled overflow valve, and the force applied by the seismic source reaction force cylinder to the pressure plate is equal to the oil pressure multiplied by the cylinder cross-sectional area of ​​the seismic source reaction force cylinder. Therefore, changing the oil pressure can change the force applied to the pressure plate, so that the seismic source reaction force cylinder can provide reaction forces of different sizes to adapt to different sizes of shock forces.

Description

Technical Field

[0001] The present invention relates to the technical field of seismic source generators, and in particular to a controllable seismic source reaction force real-time adjustment system and an adjustment method thereof. Background Art

[0002] Using controllable seismic sources to artificially stimulate seismic waves is an important method for seismic exploration. Controllable seismic sources have super anti-interference capabilities. Since large controllable seismic sources and other vehicle-mounted seismic sources cannot enter complex surface areas such as islands and jungles, a remote-controlled self-propelled controllable seismic source developed based on actual application needs has a small body size, small turning radius, and maneuverability, making it very suitable for island and jungle operations. At the same time, the use of remote control for walking and construction also ensures the safety of personnel during construction operations.

[0003] The existing seismic source generator is provided with a total of four flippable legs at the front and rear ends of the frame. When a seismic source is required, the four legs are rotated and opened to contact the ground, so that the entire frame is lifted. After the four legs are opened, a larger bottom surface is formed, so that when the seismic source is used on a slope, the frame will not slide down along the slope.

[0004] The above-mentioned existing technical solution has the following defects: in this technical solution, the lifting cylinder is pressed downward to provide a reaction force for the source servo mechanism, so that the source servo mechanism will not be unable to achieve the purpose of generating a seismic source due to upward recoil during vibration. However, in actual use, the source servo mechanism will be selected to generate different exciting forces according to different geological conditions. When the reaction force provided by the lifting cylinder is much greater than the exciting force, the seismic source cannot be generated. Summary of the invention

[0005] In view of the deficiencies in the prior art, one of the objects of the present invention is to provide a controllable seismic source reaction force real-time adjustment system, which has the advantage of being applicable to situations where different exciting forces are generated.

[0006] The above-mentioned inventive object of the present invention is achieved through the following technical scheme: a controllable seismic source reaction force real-time adjustment system, including a seismic source servo mechanism and a seismic source reaction force mechanism that provides reaction force for the seismic source servo mechanism, the seismic source servo mechanism includes a shock plate, the seismic source reaction force mechanism includes an air spring fixedly connected above the shock plate, a pressure plate connected to the upper end of the air spring, and a seismic source reaction force cylinder connected above the pressure plate, and an electrically controlled overflow valve is installed on the oil inlet pipe of the seismic source reaction force cylinder.

[0007] By adopting the above technical solution, the oil pressure in the oil inlet pipe is controlled by an electronically controlled overflow valve, and the force applied by the seismic source reaction force cylinder to the pressure plate is equal to the oil pressure multiplied by the cylinder cross-sectional area of ​​the seismic source reaction force cylinder. Therefore, changing the oil pressure can change the force applied to the pressure plate, so that the seismic source reaction force cylinder can provide different sizes of reaction force to adapt to different sizes of exciting force.

[0008] In a preferred example, the present invention can be further configured as follows: an infrared displacement sensor for detecting the distance between the pressing plate and the exciting plate is installed below the pressing plate.

[0009] By adopting the above technical solution, an infrared displacement sensor is set up, and the distance between the pressure plate and the vibration plate is detected by the infrared displacement sensor.

[0010] In a preferred example, the present invention can be further configured as follows: there are three infrared displacement sensors, and the three infrared displacement sensors are evenly distributed along the circumference of a circle with the center of the pressure plate as the center.

[0011] By adopting the above technical solution, a single infrared displacement sensor may easily cause inaccurate measurement results due to the fact that the pressure plate and the vibration plate are not completely parallel. Therefore, three infrared displacement sensors are set to take the average value to make the measurement result more accurate.

[0012] In a preferred example, the present invention can be further configured as follows: the seismic source servo mechanism also includes a guide rod fixedly connected to the upper side of the middle part of the shock plate and a weight slidably connected to the guide rod, a cylindrical cavity is formed in the middle part of the weight, and a piston located in the cylindrical cavity is fixedly connected to the guide rod.

[0013] By adopting the above technical solution, when oil is injected into the space above the piston in the cylindrical cavity, the weight moves upward along the guide rod; when oil is injected into the space below the piston in the cylindrical cavity, the weight moves downward along the guide rod, controlling the rise and fall of the seismic source to generate exciting force.

[0014] In a preferred example, the present invention can be further configured as follows: a first acceleration sensor is installed on the weight, and a second acceleration sensor is installed on the shock plate.

[0015] By adopting the above technical solution, the acceleration of the weight and the vibration plate are detected respectively by the first acceleration sensor and the second acceleration sensor.

[0016] In a preferred example, the present invention can be further configured as follows: there are four air springs, and the four air springs are evenly distributed around the circumference of the guide rod.

[0017] By adopting the above technical solution, the air springs uniformly distributed around the guide rod can be evenly stressed.

[0018] Another object of the present invention is to provide an adjustment method for a real-time adjustment system of a vibratory source reaction force.

[0019] The above object of the present invention is achieved by the following technical solutions:

[0020] An adjustment method for a real-time adjustment system of a vibratory source reaction force,

[0021] S1. Detect and calculate the magnitude G of the exciting force;

[0022] S2. Detect and calculate the magnitude P1 of the reaction force exerted by the reaction force cylinder of the vibratory source on the pressing plate;

[0023] S3. Compare G and P1. When G > P1, control the electro-hydraulic overflow valve to increase the overflow pressure and increase the oil pressure in the oil pipe; when G < P1 / (1 + n%), control the electro-hydraulic overflow valve to decrease the overflow pressure and decrease the oil pressure in the oil pipe.

[0024] By adopting the above technical solutions, through the above control method, the reaction force provided by the reaction force cylinder of the vibratory source is slightly greater than the magnitude of the real-time exciting force, so that the vibratory source servo mechanism will not fail to achieve the purpose of generating a vibratory source due to upward recoil during the vibration process, and at the same time, the reaction force will not be too large.

[0025] In a preferred example of the present invention, it can be further configured that: the mass of the weight is m1, the acceleration of the weight measured by the first acceleration sensor is , the total weight of the exciting plate and the guide rod part is m2, and the acceleration of the exciting plate measured by the second acceleration sensor is , , and the magnitude of the exciting force is G.

[0026] By adopting the above technical solutions, the magnitude of the exciting force is calculated through the above steps.

[0027] In a preferred example of the present invention, it can be further configured that: the average value of the data measured by the three infrared displacement sensors is used as the spacing value L between the pressing plate and the exciting plate during calculation, the compression amount H of the air spring is calculated according to the spacing value L, the pressure value P borne by a single air spring at this time is obtained through conversion by the H-P correlation curve, and the total pressure value P1 is obtained by multiplying the pressure value P of a single air spring by the number of air springs.

[0028] By adopting the above technical solutions, the total pressure value P1 of the reaction force cylinder of the vibratory source is calculated through the above steps.

[0029] In summary, the present invention includes at least one of the following beneficial technical effects:

[0030] 1. The oil pressure in the oil inlet pipe is controlled by the electronically controlled overflow valve. Changing the oil pressure changes the force applied to the pressure plate, so that the source reaction force cylinder can provide different reaction forces to adapt to different exciting forces;

[0031] 2. Through this control method, the reaction force provided by the vibration source reaction force cylinder is slightly greater than the exciting force, so that the vibration source servo mechanism will not be unable to achieve the purpose of generating the vibration source due to upward recoil during vibration, and the reaction force will not be too large BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of a seismic source servo mechanism and a seismic source reaction force machine in an embodiment;

[0033] Figure 2 Schematic diagram of the oil circuit of the seismic source reaction force cylinder in the embodiment.

[0034] Figure numerals: 1. seismic source servo mechanism; 2. seismic source reaction mechanism; 3. excitation plate; 4. guide rod; 5. heavy hammer; 6. cylindrical cavity; 7. piston; 8. first acceleration sensor; 9. second acceleration sensor; 10. air spring; 11. pressure plate; 12. limit rod; 13. limit block; 14. avoidance hole; 15. seismic source reaction cylinder; 16. downward pressure oil pipe; 17. rising oil pipe; 18. electrically controlled reversing valve; 19. oil inlet pipe; 20. oil outlet pipe; 21. electrically controlled overflow valve; 22. one-way valve; 23. infrared displacement sensor. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0036] like Figure 1 As shown, a controllable seismic source reaction force real-time adjustment system includes a seismic source servo mechanism 1 and a seismic source reaction force mechanism 2 providing reaction force for the seismic source servo mechanism 1 .

[0037] like Figure 1 As shown, the source servo mechanism 1 includes a shock plate 3, a guide rod 4 connected to the upper part of the middle of the shock plate 3, and a weight 5 slidably connected to the guide rod 4. A cylindrical cavity 6 is formed in the middle of the weight 5, and a piston 7 located in the cylindrical cavity 6 is fixedly connected to the guide rod 4. When oil is injected into the space above the piston 7 in the cylindrical cavity 6, the weight 5 moves upward along the guide rod 4; when oil is injected into the space below the piston 7 in the cylindrical cavity 6, the weight 5 moves downward along the guide rod 4.

[0038] like Figure 1 As shown, the mass of the weight 5 is m1, and a first acceleration sensor 8 is installed on the weight 5. The first acceleration sensor 8 measures the acceleration of the weight 5 as The total weight of the shock plate 3 and the guide rod 4 is m2. A second acceleration sensor 9 is installed on the shock plate 3. The acceleration of the shock plate 3 measured by the second acceleration sensor 9 is .

[0039]

[0040] The magnitude of the exciting force is G.

[0041] like Figure 1 As shown, the source reaction mechanism 2 includes four air springs 10 fixedly connected above the shock plate 3. The four air springs 10 are evenly distributed around the guide rod 4 in a circumferential circle, and the upper ends of the four air springs 10 are fixedly connected to the same pressure plate 11. A vertical limit rod 12 is welded to the upper surface of the shock plate 3 at the positions on both sides of the guide rod 4. The upper end of the limit rod 12 passes through the pressure plate 11, and a limit block 13 is fixedly connected to the end of the limit rod 12 that passes through the pressure plate 11. The limit block 13 and the pressure plate 11 are abutted to limit the maximum distance between the limit plate and the pressure plate 11. A avoidance hole 14 for avoiding the heavy hammer 5 is opened in the middle of the pressure plate 11, and a vertical source reaction oil cylinder 15 is fixedly connected to the upper surface of the pressure plate 11 at the positions on both sides of the avoidance hole 14. The source reaction oil cylinder 15 is vertically arranged, and its upper end is connected to the frame of the controllable seismic source. The vibration source reaction force cylinder 15 applies pressure to the pressure plate 11 to provide a reaction force to offset the exciting force generated by the vibration source servo mechanism 1 .

[0042] like Figure 2 As shown, the upper oil ports of the two seismic source reaction force cylinders 15 are connected to the down-pressure oil pipe 16, and the lower oil ports of the two seismic source reaction force cylinders 15 are connected to the up-pressure oil pipe 17. The down-pressure oil pipe 16 and the up-pressure oil pipe 17 are connected to the electric control reversing valve 18 at one end away from the seismic source reaction force cylinder 15, and the electric control reversing valve 18 is also connected to the oil inlet pipe 19 and the oil outlet pipe 20. The oil inlet pipe 19 is installed with an electric control overflow valve 21, and the oil outlet pipe 20 is installed with a one-way valve 22 for controlling the one-way flow of hydraulic oil.

[0043] like Figure 2 As shown, three infrared displacement sensors 23 are installed under the pressing plate 11, and the three infrared displacement sensors 23 are evenly distributed along the circumference of a circle with the center of the pressing plate 11 as the center. The three infrared displacement sensors 23 detect the distance between the pressing plate 11 and the exciting plate 3, and the average value of the data measured by the three infrared displacement sensors 23 is used as the distance value L between the pressing plate 11 and the exciting plate 3 during calculation.

[0044] The HP correlation curve between the compression amount H and the bearing pressure P of the air spring 10 is provided by the manufacturer of the air spring 10 or obtained by actual measurement.

[0045] The compression amount H of the air spring 10 is calculated according to the spacing value L, and the pressure value P borne by a single air spring 10 at this time is obtained by converting through the H-P correlation curve. The total pressure value P1 is obtained by multiplying the pressure value P of a single air spring 10 by the number of air springs 10.

[0046] Compare the total pressure P1 with G. When G > P1, control the electro-hydraulic overflow valve 21 to increase the overflow pressure and increase the oil pressure in the oil pipe, so that the total pressure value of the vibration source reaction force cylinder 15 on the pressing plate 11 increases. When G < P1 / (1 + n%), control the electro-hydraulic overflow valve 21 to decrease the overflow pressure and decrease the oil pressure in the oil pipe, so that the total pressure value of the vibration source reaction force cylinder 15 on the pressing plate 11 decreases. Where n is a positive number and can be set according to requirements.

[0047] The embodiments of the specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A controllable seismic source reaction force real-time adjustment system, comprising a seismic source servo mechanism (1) and a seismic source reaction force mechanism (2) for providing reaction force for the seismic source servo mechanism (1), characterized in that: The said vibration source servo mechanism (1) includes a vibration exciting plate (3). The vibration source reaction force mechanism (2) includes an air spring (10) fixedly connected above the vibration exciting plate (3), a pressure plate (11) connected to the upper end of the air spring (10), and a vibration source reaction force oil cylinder (15) connected above the pressure plate (11). An electro-control overflow valve (21) is installed on the oil inlet pipe (19) of the vibration source reaction force oil cylinder (15). Below the pressure plate (11), an infrared displacement sensor (23) for detecting the distance between the pressure plate (11) and the vibration exciting plate (3) is installed. The vibration source servo mechanism (1) further includes a guide rod (4) fixedly connected to the middle part of the vibration exciting plate (3) and facing upward, and a weight (5) slidably connected to the guide rod (4). A cylindrical cavity (6) is formed in the middle of the weight (5), and a piston (7) fixedly connected to the guide rod (4) and located inside the cylindrical cavity (6) is provided. A first acceleration sensor (8) is installed on the weight (5), and a second acceleration sensor (9) is installed on the vibration exciting plate (3). On the upper surface of the pressure plate (11) at positions on both sides of the weight (5), one of the said vibration source reaction force oil cylinders (15) is fixedly connected to each. The vibration source reaction force oil cylinder (15) is vertically arranged and its upper end is connected to the frame of the vibratory source. The vibration source reaction force oil cylinder (15) is used to apply pressure to the pressure plate (11) to provide a reaction force for offsetting the exciting force generated by the vibration source servo mechanism (1).

2. The controllable vibrator reaction force real-time adjustment system according to claim 1 is characterized in that: There are three of the said infrared displacement sensors (23), and the three infrared displacement sensors (23) are evenly distributed along a circumference with the center of the pressure plate (11) as the center.

3. The controllable vibrator reaction force real-time adjustment system according to claim 1 is characterized in that: There are four of the said air springs (10), and the four air springs (10) are evenly distributed in a circumferential circle around the guide rod (4).

4. A method for adjusting a controllable vibrator reaction force real-time adjustment system, characterized in that: The real-time adjustment of the vibration source reaction force of the vibratory source is carried out by using the vibration source reaction force real-time adjustment system according to any one of claims 1-3. The adjustment method includes the following steps: S1. Detect and calculate the magnitude G of the exciting force. S2. Detect and calculate the magnitude P1 of the reaction force applied by the vibration source reaction force oil cylinder (15) to the pressure plate (11). S3. Compare G and P1. When G > P1, control the electro-control overflow valve (21) to increase the overflow pressure and increase the oil pressure in the oil pipe. When G < P1 / (1 + n%), control the electro-control overflow valve (21) to decrease the overflow pressure and decrease the oil pressure in the oil pipe.

5. The adjustment method of the controllable vibrator reaction force real-time adjustment system according to claim 4 is characterized by: The mass of the weight (5) is m1, and the acceleration of the weight (5) measured by the first acceleration sensor (8) is The total weight of the vibration plate (3) and the guide rod (4) is m2. The acceleration of the vibration plate (3) measured by the second acceleration sensor (9) is The magnitude of the exciting force is G.

6. The adjustment method of the controllable vibrator reaction force real-time adjustment system according to claim 5 is characterized by: Take the average value of the data measured by the three infrared displacement sensors (23) as the distance value L between the pressure plate (11) and the vibration exciting plate (3) during calculation. Calculate the compression amount H of the air spring (10) according to the distance value L, and convert it through the H-P correlation curve to obtain the pressure value P borne by a single air spring (10) at this time. Multiply the pressure value P of a single air spring (10) by the number of air springs (10) to obtain the total pressure value P1.

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