Source excitation device

Abstract

The present application proposes a seismic source excitation device, which includes a transmitter assembly, a rotating table, a hydraulic station, a motor and a base, wherein the transmitter assembly is used to launch a bullet into a coal rock mass, so as to generate seismic waves through the impact of the bullet on the coal rock mass; wherein the transmitter assembly includes a bullet; the rotating table is arranged on the base, connected to the transmitter assembly, and used to control the rotation direction of the transmitter assembly; the hydraulic station is connected to the rotating table, and is used to provide power to the rotating table to drive the rotating table to rotate; the motor is connected to the transmitter assembly, and is used to provide power to the electromagnetic coil in the transmitter assembly, so as to generate thrust acting on the bullet through the electromagnetic coil. Thus, based on the power provided by the motor, the power supply electrical energy can be converted into the kinetic energy of the bullet through the electromagnetic coil, so that the bullet completes the impact on the coal rock mass, and thus the seismic waves can be effectively obtained.

Description

Technical Field

[0001] The present application relates to the field of seismic exploration equipment, and in particular to a seismic source excitation device. Background Art

[0002] For the safety of coal mine production, before mining coal, relevant staff need to conduct a comprehensive survey of the coal-rock structure underground in the coal mine to identify folds, faults, and magmatic rock intrusions, and analyze the factors affecting safety in combination with the structure to make effective avoidance plans. In particular, during the coal mining process, the working face is disturbed by mining, and the coal-rock mass is continuously and discontinuously damaged, affecting the stability of the coal-rock mass. Therefore, accurate monitoring of the all-round coal-rock structure of the coal mine working face throughout its life cycle can provide guarantees for coal-rock stability control and safe mining in coal mines.

[0003] In the related technology, seismic exploration technology can be used to detect the coal-rock structure in coal mines. In seismic exploration technology, a seismic source device is used to generate seismic waves. By analyzing the dynamic propagation characteristics of seismic waves in coal mine media, the coal-rock structure in coal mines can be detected. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0005] The present application proposes a seismic source excitation device, which can realize the power supply provided by the motor, convert the power supply electrical energy into bullet kinetic energy through the electromagnetic coil, so that the bullet can complete the impact on the coal rock mass, and then effectively obtain seismic waves.

[0006] The first aspect of the present application provides a seismic source excitation device, which includes a transmitter assembly, a rotating table, a hydraulic station, an electric motor and a base, wherein the transmitter assembly is used to launch bullets into a coal rock mass so as to generate seismic waves through the impact of the bullets on the coal rock mass; wherein the transmitter assembly includes the bullets; the rotating table is arranged on the base and connected to the transmitter assembly, and is used to control the rotation direction of the transmitter assembly; the hydraulic station is connected to the rotating table and is used to provide power to the rotating table to drive the rotating table to rotate; the electric motor is connected to the transmitter assembly and is used to provide power to the electromagnetic coil in the transmitter assembly so as to generate thrust acting on the bullet through the electromagnetic coil.

[0007] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0009] Figure 1 A schematic diagram of the structure of the source excitation device provided in Example 1 of the present application;

[0010] Figure 2 A schematic diagram of the structure of the transmitter assembly provided in this application;

[0011] Figure 3 A schematic diagram of the structure of the rotating platform provided in this application;

[0012] Figure 4 A schematic diagram of the structure of the underground impact source equipment for coal mines provided in this application;

[0013] Figure 5 A schematic diagram of the structure of the pulsed emission assembly provided in this application;

[0014] Figure 6 This is a schematic structural diagram of the spur gear drive rotary table provided in this application. DETAILED DESCRIPTION

[0015] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0016] At present, seismic exploration is often used to detect the coal rock structure underground in coal mines.

[0017] Among them, the seismic sources used in seismic exploration are mainly divided into explosive sources and non-explosive sources. Among them, explosive sources are widely used, but the sub-wave stability is poor, and because explosive sources pollute the environment to a certain extent, explosives are strictly restricted, so explosive sources cannot guarantee the monitoring of coal rock structure throughout the life cycle of the mine. Non-explosive seismic sources mainly include hammer seismic sources, controllable source vehicles, air gun seismic sources, spark seismic sources, etc.; among them, the excitation energy of hammer seismic sources is limited, and it is easily affected by the environment, and cannot meet the requirements of deep coal rock structure monitoring; the controllable source vehicle is bulky and not easy to move underground, and the excitation signal of the controllable source vehicle is usually downward, which cannot meet the detection of coal rock structures on both sides of the underground; the air gun seismic source highly compresses the gas and then releases shock waves instantly to generate a pulse signal. The generated seismic waves have a high frequency and good repeatability; the spark seismic source mainly converts the electrical energy stored in the capacitor into mechanical energy through high-voltage discharge, which has the advantages of environmental protection, expandable energy, and safe operation. However, the use sites of air gun seismic sources and spark seismic sources are generally oceans or land waters, that is, their use sites are limited.

[0018] In view of the above problems, the present application proposes a seismic source excitation device.

[0019] The seismic source excitation device of an embodiment of the present application is described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the structure of the seismic source excitation device provided in Example 1 of the present application.

[0021] like Figure 1 As shown, the source excitation device 100 includes a transmitter assembly 110, a rotating platform 120, a hydraulic station 130, a motor 140 and a base 150, and the transmitter assembly 110 includes a bullet 111 and an electromagnetic coil 112, wherein:

[0022] The launcher assembly 110 may be used to launch a bullet into a coal rock mass, so as to generate seismic waves through the impact of the bullet on the coal rock mass; wherein the launcher assembly 110 may include a bullet 111 .

[0023] The rotating platform 120 is disposed on the base 150 and connected to the transmitter assembly 110 , and can be used to control the rotation direction of the transmitter assembly 110 .

[0024] The hydraulic station 130 is connected to the rotating platform 120 and can be used to provide power to the rotating platform 120 to drive the rotating platform to rotate.

[0025] The motor 140 , connected to the launcher assembly 110 , can be used to provide power to the electromagnetic coil 112 in the launcher assembly 110 , so as to generate thrust acting on the bullet 111 through the electromagnetic coil 112 .

[0026] It should be noted that the base 150 may be, but is not limited to, a vehicle, a support frame, etc., and this application does not impose any restrictions on this.

[0027] In some embodiments, the shape of the bullet may be, but is not limited to, cylindrical, spindle-shaped, diamond-shaped, etc., and the present application does not impose any limitation on this.

[0028] In some embodiments, Figure 2 As shown in (a) and (b), when the launcher assembly 110 includes a bullet 111 and an electromagnetic coil 112, the launcher assembly 110 may also include a launcher cavity 113, a dust collecting ring 114, a water spraying device 115 and a first base 116; wherein, Figure 2 (a) is a stereoscopic view of the transmitter assembly. Figure 2 (b) is a cross-sectional view of the transmitter assembly.

[0029] The launcher cavity 113 can be used to provide a moving space for the bullet 111; the electromagnetic coil 112 can be arranged on the inner wall of the launcher cavity 113;

[0030] In some embodiments, the emitter cavity 113 may be made of, but not limited to, alloy steel, and this application does not impose any restrictions on this.

[0031] The dust collecting ring 114 can be arranged at the launch port of the launcher cavity 113 to absorb dust, thereby preventing dust generated by the bullet hitting the coal and rock from entering the launcher cavity 113 .

[0032] Among them, the water spraying device 115 can be used to implement water spraying operations after the bullet is fired.

[0033] In some embodiments, the transmitter assembly 110 may further include a sensing element; wherein the sensing element is connected to the water spraying device 115 and may be used to control the water spraying device 115 to perform a water spraying operation.

[0034] As an example, when the sensing element senses that the bullet hits the coal rock, the water spraying device 115 can be controlled to spray water to the area where the bullet hits the coal rock. Thus, the dust content in the air can be effectively reduced by the water spraying operation; at the same time, the bullet's temperature rises due to the impact and friction, and the bullet's temperature can be effectively reduced by the water spraying operation.

[0035] The first base 116 may be used to fix the transmitter cavity 113 on the rotating platform 120 .

[0036] In some embodiments, Figure 3 As shown, Figure 3 1 is a perspective view of a rotating stage. The rotating stage 120 may include a bracket 121 , a gear 122 , a turntable 123 and a second base 124 .

[0037] The bracket 121 is connected to the first base 116 in the transmitter assembly 110 and can be used to fix the transmitter assembly 110 .

[0038] The turntable 123 is connected to the second base 124 via the gear 122 , and can be used to achieve 360° rotation through the power transmitted by the gear 122 .

[0039] In some embodiments, the hydraulic station 130 is connected to the gear 122 and can be used to drive the gear 122 to rotate. Thus, the hydraulic station 130 can provide power to the rotating platform 120 to drive the rotating platform 120 to rotate.

[0040] In some embodiments, the force acting on the bullet 111 may include a forward thrust and a reverse thrust. The forward thrust can push the bullet out of the launch position in the launcher cavity 113, and the reverse thrust pushes the bullet 111 back to the launch position in the launcher cavity 113.

[0041] Alternatively, if Figure 2 As shown in (b), the launcher assembly 110 may further include a shock absorbing pad 117. The shock absorbing pad may be used to provide a shock absorbing function when the bullet 111 returns to the launch position, so as to protect the launcher cavity 113.

[0042] In some embodiments, the source excitation device 100 may further include a control system; wherein the control system is connected to the motor 140 and may be used to control the voltage of the motor 140 .

[0043] Optionally, the control system can be used to obtain the voltage of the electric motor.

[0044] In order to clearly explain how the control system obtains the voltage of the motor, in a possible implementation of the embodiment of the present application, when the thrust acting on the bullet includes the first positive thrust, the following steps can be used to obtain the voltage of the motor:

[0045] 1. Obtain the dominant frequency of seismic waves.

[0046] Among them, the dominant frequency of the seismic wave refers to the frequency corresponding to the maximum value in the spectrum.

[0047] It should be noted that seismic wave signals with high signal-to-noise ratios help to more accurately analyze the characteristics and laws of seismic waves. However, the main frequency of seismic waves is directly related to the signal-to-noise ratio of seismic wave signals, that is, the larger the main frequency of seismic waves, the higher the signal-to-noise ratio of seismic waves.

[0048] In the present application, the main frequency of the seismic wave can be obtained. For example, the main frequency of the seismic wave can be obtained according to the user's input.

[0049] 2. Based on the main frequency of the seismic wave, query the first thrust value corresponding to the main frequency.

[0050] Among them, the first thrust value is the value of the first positive thrust acting on the bullet.

[0051] As an example, a correspondence between the main frequency of the seismic wave and the thrust value can be established in advance and stored, so that when the main frequency of the seismic wave is determined, the above correspondence can be queried to obtain the first thrust value corresponding to the main frequency of the seismic wave.

[0052] 3. Based on the first thrust value, determine the voltage of the motor.

[0053] As an example, assuming that the first thrust value is F, the voltage U of the motor can be determined according to the following formula:

[0054]

[0055] Where m is the mass of the bullet, f is the power frequency of the motor, τ is the pole pitch of the motor, R1 is the primary resistance; r i is the secondary resistance, where i∈[0,n], n is an integer greater than or equal to 0, and i is an integer; s is the slip rate when the motor rotates, and x1 is the leakage reactance (also called leakage reactance) of the electromagnetic coil.

[0056] Therefore, the voltage of the motor that needs to be controlled can be effectively determined based on the main frequency of the required seismic wave.

[0057] In another possible implementation of the embodiment of the present application, when the thrust acting on the bullet includes a second positive thrust, the following steps may be used to obtain the motor voltage:

[0058] 1. Obtain the detection depth of coal mines.

[0059] In this application, the coal mine detection depth can be obtained. For example, the coal mine detection depth can be obtained according to the user's input.

[0060] 2. According to the coal mine detection depth, query the bullet impact energy corresponding to the coal mine detection depth.

[0061] As an example, a correspondence between coal mine detection depth and bullet impact energy can be established in advance and stored, so that when the coal mine detection depth is determined, the above correspondence can be queried to obtain the bullet impact energy corresponding to the coal mine detection depth.

[0062] 3. Based on the impact energy of the bullet and the moving distance of the bullet under the action of the second forward thrust, determine the second thrust value of the second forward thrust.

[0063] As an example, assuming that the impact energy of the bullet is W, and the moving distance of the bullet under the action of the second positive thrust is L, the second thrust value F' of the second positive thrust can be determined according to the following formula:

[0064]

[0065] 4. Based on the second thrust value of the second forward thrust, obtain the voltage of the motor.

[0066] As an example, assuming that the second thrust of the second forward thrust is F', the voltage U of the motor can be determined according to the following formula:

[0067]

[0068] Where m is the mass of the bullet, f is the power frequency of the motor, τ is the pole pitch of the motor, R1 is the primary resistance; r iis the secondary resistance, where i∈[0,n], n is an integer greater than or equal to 0, and i is an integer; s is the slip rate when the motor rotates, and x1 is the leakage reactance of the electromagnetic coil.

[0069] Thus, the bullet impact energy that needs to be located can be determined according to the required coal detection depth, and the voltage of the motor that needs to be controlled can be effectively determined.

[0070] It should be noted that the waveform of the seismic wave excited by the bullet is related to the contour shape of the bullet. Therefore, in practical applications, the waveform of the seismic wave excited by the bullet can be controlled by changing the contour shape of the bullet. Therefore, in some embodiments, the control system can also be used to obtain the target shape of the bullet.

[0071] In order to clearly explain how the control system obtains the target shape of the bullet, as a possible implementation method, the following steps can be used to obtain the target shape of the bullet:

[0072] 1. Decompose the desired waveform required by the user to obtain multiple sub-waveforms.

[0073] In the embodiment of the present application, the expected waveform may be a composite waveform.

[0074] In the embodiment of the present application, the desired waveform required by the user can be obtained. For example, the desired waveform required by the user can be determined from pre-stored waveforms based on the user's selection.

[0075] In the embodiment of the present application, the composite waveform required by the user can be decomposed to obtain multiple sub-waveforms.

[0076] As an example, the composite waveform may be decomposed by using methods such as Fourier transform and bandpass filter array to obtain multiple sub-waveforms.

[0077] It should be noted that the above method for decomposing a composite waveform is merely exemplary. In practical applications, the composite waveform needs to be modified and segmented according to actual needs. This application does not limit the method for decomposing a composite waveform.

[0078] 2. For any sub-waveform, according to the sub-waveform, a pre-trained bullet shape prediction model is used to predict the bullet shape to obtain a predicted shape.

[0079] In an embodiment of the present application, the bullet shape prediction model may be a neural network model, and may be used to predict a corresponding shape based on an input waveform.

[0080] In the embodiment of the present application, for any sub-waveform, the sub-waveform is input into a pre-trained bullet shape prediction model to obtain a predicted shape corresponding to the sub-waveform.

[0081] 3. Based on the predicted shapes, determine the target shape of the bullet.

[0082] In the embodiment of the present application, the target shape of the bullet can be determined based on the predicted shapes.

[0083] As an example, the predicted shapes may be combined in a random combination manner to obtain the target shape of the bullet.

[0084] Thereby, the target shape of the bullet can be effectively obtained.

[0085] In some embodiments, the control system may also be used to control the launcher assembly to fire bullets at a preset frequency.

[0086] It should be noted that the preset frequency can be set as needed.

[0087] The seismic source excitation device of the embodiment of the present application includes a transmitter assembly, a rotating table, a hydraulic station, a motor and a base, wherein the transmitter assembly is used to launch a bullet into the coal rock mass to generate seismic waves through the impact of the bullet on the coal rock mass; wherein the transmitter assembly includes a bullet; the rotating table is arranged on the base, connected to the transmitter assembly, and used to control the rotation direction of the transmitter assembly; the hydraulic station is connected to the rotating table, and is used to provide power to the rotating table to drive the rotating table to rotate; the motor is connected to the transmitter assembly, and is used to provide power to the electromagnetic coil in the transmitter assembly to generate thrust acting on the bullet through the electromagnetic coil. Thus, it is possible to realize the conversion of power supply electrical energy into bullet kinetic energy through the electromagnetic coil based on the power supply provided by the motor, so that the bullet completes the impact on the coal rock mass, and thus effectively obtain seismic waves.

[0088] In order to clearly illustrate the above embodiments of the present application, detailed description is given below with reference to examples.

[0089] As an example, Figure 4 This is a schematic diagram of the coal mine underground impact source equipment (referred to as the source excitation device in this application) provided in this application; wherein, Figure 4 The reference numeral 41 is a pulse transmission component (referred to as a transmitter component in this application), Figure 4 The reference numeral 42 is a spur gear driven rotary table (referred to as a rotary table in this application). Figure 4 The mark 43 is the hydraulic station. Figure 4 The reference numeral 44 is a flat linear motor (referred to as a motor in this application). Figure 4 The reference numeral 45 is a vehicle (referred to as a base in this application).

[0090] The underground impact source equipment of the coal mine may also include a control system, which can be used to control the flat linear motor 44 .

[0091] It should be noted that the control system can be an intelligent remote control system developed using a human-computer interaction interface and an intelligent microprocessor. Its control accuracy can reach 0.1V, and the touch control screen it uses can directly input the required pressure for use. At the same time, a manual operation button can be configured to give it a dual control function, and special processing can be used to eliminate electromagnetic interference signals.

[0092] Pulse emission components:

[0093] like Figure 5 As shown in (a) and (b), the pulse-type launch assembly 41 may include a shock-absorbing pad 51 , an electromagnetic coil 52 , a launcher cavity 53 , a bullet 54 , a dust collecting ring 55 , a water spraying device 56 , and a first base 57 .

[0094] The shock-absorbing pad 51 can be used to prevent the bullet from impacting the launcher cavity 53 too fast and causing damage to the cavity when the bullet returns to the launch position in the launcher cavity 53;

[0095] The launcher cavity 53 can be used to provide a moving space for the bullet 54, and the inner wall of the cavity is smooth; wherein the electromagnetic coil 52 is arranged on the inner wall of the launcher cavity 53; the launcher cavity 53 can be made of alloy steel, which is durable;

[0096] The dust collecting ring 55 is arranged at the emission port of the emitter cavity 53 and is used for absorbing dust;

[0097] The water spraying device 56 can be controlled by a sensing element. When the bullet 54 impacts the coal rock mass, the water spraying device 56 can automatically spray water to the area where the bullet 54 impacts the coal rock mass, thereby playing a certain role in removing dust and reducing the temperature of the bullet. When the bullet is recovered, the water spraying device 56 can be sensed and the water spraying operation stops.

[0098] The first base 57 is used to fix the emitter cavity 53 on the spur gear drive rotating platform 42 .

[0099] The bullet 54 is located inside the launcher cavity 53 and fits tightly with the launcher cavity 53. It should be noted that the bullet 53 may be, but is not limited to, cylindrical, spindle-shaped, diamond-shaped, or a composite shape.

[0100] It should also be noted that a neural network model can be used to establish an effective solution for generating arbitrary waveforms. Ultimately, the shape of the bullet can be selected based on the stress wave shape that needs to be excited. Bullets of different shapes hit the coal and rock mass to generate stress waves of different shapes, thereby realizing the use of stress waves of different shapes to detect the structure of the coal and rock mass.

[0101] In order to obtain the target shape of the bullet, as a possible implementation method, the expected waveform required by the user can be decomposed to obtain multiple sub-waveforms; for any sub-waveform, a pre-trained bullet shape prediction model is used to predict the bullet shape according to the sub-waveform to obtain a predicted shape; based on each predicted shape, the target shape of the bullet is determined.

[0102] It should be noted that the control system can quantitatively control the voltage of the flat wire linear motor 44. The flat wire linear motor 44 drives the current to flow in the electromagnetic coil 52 by applying voltage to the electromagnetic coil 52, so that the electromagnetic coil 52 is subjected to force due to electromagnetic induction, and this force is applied to the bullet, so that the bullet obtains thrust, completing the process of converting electrical energy into kinetic energy of the bullet, and implementing an impact on the coal rock mass, wherein the impact has the characteristics of controllable impact energy and stable and repeated excitation.

[0103] Spur gear drive rotary table:

[0104] like Figure 6 As shown, the spur gear drive rotary table 42 includes a bracket 61, a gear 62, a turntable 63 and a second base 64. The bracket 61 is connected to the first base 57 in the pulse emission assembly 41, and is used to fix the pulse emission assembly 41; the turntable 63 is connected to the second base 64 through the gear 62, and is used to achieve 360° rotation through the power transmitted by the gear 62; the second base 64 is connected to the car box bottom plate of the matching car 45 and the turntable 63 through screws, and plays the role of fixing the spur gear drive rotary table.

[0105] Hydraulic station:

[0106] The hydraulic station 43 is connected to the spur gear drive rotary table 42, and is used to provide power for the spur gear drive rotary table 42 to drive the spur gear drive rotary table 42 to rotate; wherein, the surface of the oil circuit integrated block of the hydraulic station 43 can be nickel-plated, and the hydraulic station 43 can be fixed to the car box bottom plate of the matching car 45 by screws.

[0107] Flat linear motor:

[0108] The flat linear motor 44 is connected to the pulse-type transmitting assembly 41 through the electromagnetic coil 52 to provide power to the electromagnetic coil 52 .

[0109] Matching vehicle: Matching vehicle 46 can be used to load and fix pulse type emission assembly 41, spur gear drive rotary table 42, hydraulic station 43 and flat linear motor 44. It should be noted that different models can be selected in different working sites.

[0110] The specific operation process of the impact source equipment in coal mines can be divided into the following processes:

[0111] 1. Control process of spur gear drive rotary table

[0112] The distribution vehicle 46 transports the underground impact source equipment of the coal mine to the impact operation point where the impact operation needs to be performed. At this time, the pulse emission assembly 41 is parallel to the front of the distribution vehicle 46; the gear 62 in the spur gear drive rotating table 42 is controlled to drive the spur gear drive rotating table 42, and the pulse emission assembly 41 is rotated to the required angle, waiting for the flat linear motor 44 to supply power for the impact operation.

[0113] 2. Determination process of voltage of flat linear motor

[0114] When using an impact source to detect coal and rock mass structures, if the impact energy of the bullet is too large, it will cause impact damage to the coal and rock mass in the coal mine. If the impact energy of the bullet is too small, it will cause insufficient excitation energy, and the detectors arranged on one side of the tunnel will not be able to stably receive the seismic waves excited by the impact source, resulting in insufficient detection accuracy. Therefore, during the source impact process, an appropriate flat linear motor voltage should be selected to ensure the stability of the seismic wavelet waveform and maximize the inversion accuracy.

[0115] Before the bullet hits the coal and rock mass, at the end of the launcher cavity, the bullet's speed, displacement, and acceleration are all 0; then, the flat-wire linear motor energizes the electromagnetic coil in a positive direction, generating a positive thrust acting on the bullet, and under the action of the positive thrust, the bullet hits the coal and rock mass. Assume that the value of the positive thrust is F, m is the mass of the bullet, f is the power frequency of the motor, τ is the pole pitch of the motor, r1 is the primary resistance; r2...r n is the secondary resistance; s is the slip rate when the motor rotates, and the value of the forward thrust is as shown in formula (1).

[0116] It can be seen from formula (1) that the impact energy of the bullet is affected by the motor voltage, the power frequency of the motor, the pole pitch, the primary resistance and the secondary resistance. Among them, the pole pitch, the primary resistance and the secondary resistance are fixed, so the value of the forward thrust is related to the voltage and power frequency of the motor, that is, the impact energy of the bullet is proportional to the voltage of the motor and inversely proportional to the power frequency. Therefore, in practical applications, the variable frequency boosting scheme can be used to obtain the required impact energy of the impact source, so as to detect the coal rock structure at different depths, prevent the bullet impact energy from being too large, causing excessive damage to the coal rock mass at the working face; at the same time, prevent the bullet impact energy from being too small, affecting the detection depth of the coal mine.

[0117] At the same time, the magnitude of the forward thrust also directly affects the main frequency of the excited seismic waves. The main frequency of the seismic waves is directly related to the signal-to-noise ratio of the seismic wave signal, that is, the larger the main frequency, the higher the signal-to-noise ratio of the seismic waves; therefore, the main frequency of the seismic waves can be controlled by adjusting the voltage of the motor, so as to enhance the signal-to-noise ratio of the seismic waves.

[0118] Ultimately, under the condition that the earthquake source does not cause excessive damage to the coal and rock mass, the voltage of the motor can be increased to ensure the detection depth of the coal mine and maximize the signal-to-noise ratio of the seismic waves, so as to achieve the purpose of optimal detection of the coal and rock mass structure.

[0119] (3) Bullet impact and recovery process

[0120] The flat linear motor 44 is turned on, and the electromagnetic coil 52 is positively energized to generate a positive thrust acting on the bullet. At this time, the bullet is accelerated under the action of the positive thrust, and finally impacts the coal rock mass, so that a seismic wave with a highly concentrated signal amplitude is formed in a short time; after the bullet impacts the coal rock mass, the water spraying device 56 is started to automatically spray water to the area where the bullet impacts the coal rock mass, which plays a certain role in dust removal and reducing the temperature of the bullet. This process is the impact process of the bullet.

[0121] After the bullet impacts, the electromagnetic coil 52 is reversely energized to generate a reverse thrust acting on the bullet, and the bullet returns to the initial position under the action of the reverse thrust. It should be noted that the bullet recovery speed can be controlled by controlling the reverse energization voltage to prevent the bullet from being damaged by the launcher cavity 53 due to excessive speed. When the bullet returns to the launch position, the water spraying device 56 is sensed and automatically stops the water spraying operation.

[0122] Finally, the distribution vehicle 45 can be moved to the next impact point, and the impact operation can be performed again according to the above steps.

[0123] Based on the problems of poor stability, low signal-to-noise ratio, poor controllability and inefficient operation of existing seismic source equipment, it is unable to meet the requirements of accurate detection of coal and rock structure in coal mines. The coal mine underground impact seismic source equipment of this application has the following beneficial effects:

[0124] (1) It can effectively control the voltage of the motor and automatically design the bullet shape, and can achieve controllable and stable output of seismic wave energy, seismic wave waveform and main frequency of seismic waves;

[0125] (2) By rotating the platform, repeated stable excitation and efficient operation of the source at 360° in the horizontal plane can be achieved.

[0126] Therefore, the coal mine underground impact source equipment of the present application can realize the power supply based on the electric motor, convert the power supply electrical energy into the kinetic energy of the bullet through the electromagnetic coil, so that the bullet completes the impact on the coal rock mass, thereby generating seismic waves, and then the seismic waves can be used to quickly and accurately detect the coal rock structure underground in the coal mine.

[0127] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0128] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0129] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0130] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0131] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0132] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0133] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0134] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A seismic source excitation device, characterized in that: The device comprises a launcher assembly, a rotating platform, a hydraulic station, a motor and a base, wherein: The launcher assembly is used to launch a bullet into the coal-rock mass, so as to generate seismic waves through the impact of the bullet on the coal-rock mass; wherein the launcher assembly includes the bullet; The rotating platform is arranged on the base, connected to the transmitter assembly, and used to control the rotation direction of the transmitter assembly; The hydraulic station is connected to the rotating table and is used to provide power to the rotating table to drive the rotating table to rotate; The motor is connected to the launcher assembly and is used to provide power to the electromagnetic coil in the launcher assembly to generate thrust acting on the bullet through the electromagnetic coil; The device comprises a control system; wherein the control system is connected to the motor and is used to control the voltage of the motor; The control system is further used to obtain the voltage of the motor, and the thrust includes a second positive thrust; wherein the second positive thrust pushes the bullet out of the launch position in the launcher cavity; The voltage of the motor is obtained, comprising: Get the detection depth of coal mines; According to the coal mine detection depth, querying the bullet impact energy corresponding to the coal mine detection depth; determining a second thrust value of the second forward thrust based on the impact energy of the bullet and the moving distance of the bullet under the action of the second forward thrust; Based on the second thrust value of the second forward thrust, the voltage of the motor is acquired.

2. The device according to claim 1, characterized in that The transmitter assembly further includes a transmitter cavity, a dust collecting ring, a water spraying device, and a first base, wherein: The launcher cavity is used to provide a moving space for the bullet; wherein the electromagnetic coil is arranged on the inner wall of the launcher cavity; The dust collecting ring is arranged at the emission port of the emitter cavity and is used for absorbing dust; The water spraying device is used to spray water after the bullet is fired; The first base is used to fix the transmitter cavity on the rotating platform.

3. The device according to claim 2, characterized in that The thrust includes a forward thrust and a reverse thrust; wherein the forward thrust pushes the bullet out of the launch position in the launcher cavity, and the reverse thrust pushes the bullet back to the launch position; the launcher assembly also includes a shock-absorbing pad, which is used to provide a shock-absorbing function when the bullet returns to the launch position to protect the launcher cavity.

4. The device according to claim 2, characterized in that The transmitter assembly includes a sensing element, wherein the sensing element is connected to the water spraying equipment and is used to control the water spraying equipment to perform a water spraying operation.

5. The device according to claim 2, characterized in that The rotating platform comprises a bracket, a gear, a turntable, and a second base, wherein: The bracket is connected to the first base in the transmitter assembly and is used to fix the transmitter assembly; The turntable is connected to the second base via the gear, and is used to achieve 360° rotation through the power transmitted by the gear.

6. The device according to claim 5, characterized in that The hydraulic station is connected to the gear to drive the gear to rotate.

7. The device according to claim 1, characterized in that The control system is further used to obtain the voltage of the motor, and the thrust includes a second positive thrust; wherein the second positive thrust pushes the bullet out of the launch position in the launcher cavity; The voltage of the motor is obtained, comprising: Get the detection depth of coal mines; According to the coal mine detection depth, querying the bullet impact energy corresponding to the coal mine detection depth; determining a second thrust value of the second forward thrust based on the impact energy of the bullet and the moving distance of the bullet under the action of the second forward thrust; Based on the second thrust value of the second forward thrust, the voltage of the motor is acquired.

8. The device according to claim 7, characterized in that The control system is also used to obtain the target shape of the bullet; The acquisition of the target shape of the bullet includes: Decomposing the desired waveform required by the user to obtain multiple sub-waveforms; For any of the sub-waveforms, according to the sub-waveform, a bullet shape prediction model trained in advance is used to predict the bullet shape to obtain a predicted shape; Based on each of the predicted shapes, a target shape of the bullet is determined.

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