Small portable vibroseis device

Abstract

The utility model discloses a small-sized portable vibroseis device, which comprises a box body with an opening at the upper end and an accommodating space, a cover body is detachably arranged at the upper end of the box body, a servo motor is arranged in the accommodating space of the box body, a connector is arranged at the output end of the servo motor, and the small-sized portable vibroseis device further comprises three bevel gears, one end of the connector is connected with one bevel gear, the other two bevel gears are in transmission connection with the bevel gear connected with the connector, the other two bevel gears are connected with the eccentric parts respectively, and the servo motor drives the bevel gears to rotate so that the two eccentric parts can coaxially and reversely rotate. According to the utility model, the requirements of near-surface seismic exploration and small-area underground structure time-varying monitoring research can still be met while full miniaturization is carried out and the frequency of exciting the seismic source is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of seismic source devices, in particular to a small portable controllable seismic source device. Background Art

[0002] Seismic exploration is an exploration method widely used in fields such as oil exploration and urban exploration. Artificial seismic sources are an important part of seismic exploration, and controllable seismic sources are a new type of seismic source that has been emerging in recent years and has been increasingly widely used. Depending on the driving method, controllable seismic sources are divided into hydraulic, electromagnetic and precision controllable seismic sources (Chen Yuda et al., 2020). At present, precision controllable seismic sources are mainly large-tonnage low-frequency seismic sources. These seismic sources are fixedly installed, have high output, and are very effective for studying the deep structure of the earth. However, since most of them weigh more than 1t, they are inconvenient to move; and most of them have low frequencies (less than 50Hz), which are insensitive to small-scale velocity structure changes. These two shortcomings make the existing precision controllable seismic sources unsuitable for the detection of shallow earth structures such as urban exploration.

[0003] Although there are small modular controllable seismic sources in China, the weight of multiple modules combined exceeds 100Kg, and the maximum frequency can only reach 40Hz. In addition, since multiple excitation boxes need to be combined, it is necessary to perform real-time phase calibration on multiple excitation boxes to ensure that the rotation of the eccentrics in different excitation boxes is strictly in phase. Utility Model Content

[0004] Based on the technical problems existing in the background technology, the utility model proposes a small portable controllable seismic source device, which can meet the needs of near-surface seismic exploration and time-varying monitoring research of small-area underground structures while being fully miniaturized and improving the frequency of the excitation source.

[0005] The small portable controllable seismic source device proposed in the utility model comprises a box body with an opening at the upper end and a accommodating space, a cover body is detachably provided at the upper end of the box body, a servo motor is provided in the accommodating space of the box body, a connector is provided at the output end of the servo motor, and three bevel gears are also provided, one end of the connector is connected to a bevel gear, and the other two bevel gears are transmission-connected to the bevel gears connected to the connector, and the other two bevel gears are respectively connected to eccentrics, and the coaxial reverse rotation of the two eccentrics is achieved by driving the rotation of the bevel gears driven by the servo motor.

[0006] Preferably, a bottom plate is provided in the box accommodating space, a bracket is installed on the bottom plate, and the bracket is used to install the servo motor.

[0007] Preferably, a mounting platform is further provided at the upper end of the base plate, and the mounting platform is provided with three groups of mounting grooves, and a bearing seat is installed in the mounting groove through a plurality of first bearing seat mounting holes, and the bevel gear is arranged on the bearing seat.

[0008] Preferably, the bearing seat comprises an axial hole and a second bearing seat mounting hole, the axial hole is used to mount the bevel gear, and the second bearing seat mounting hole matches the first bearing seat mounting hole to enable the bearing seat to be installed in the mounting groove.

[0009] Preferably, the bottom plate further comprises a second bottom plate mounting hole, and the bottom of the box body is provided with a first bottom plate mounting hole matching with the second bottom plate mounting hole so as to mount the bottom plate on the bottom of the box body.

[0010] Preferably, the base plate further comprises a bracket mounting hole, the bracket is provided with a first positioning groove matching the bracket mounting hole so as to mount the bracket on the base plate, and the bracket is further provided with a second positioning groove and a through hole so as to fix the servo motor.

[0011] Preferably, the box body is also provided with an aviation socket and a cover mounting hole, and the cover mounting hole is used for mounting the cover body.

[0012] Preferably, an optical axis is further provided at one end of the eccentric away from the bevel gear, and the optical axis is used to connect the bevel gear and the eccentric.

[0013] Beneficial technical effects of the utility model:

[0014] 1. The utility model adopts a single servo motor to do work, and the bevel gear turns 90 degrees to drive two eccentrics. The rotation phases of the two eccentrics are strictly opposite, so there is no need for an external GPS module and a signal generator module, and the structure is simple.

[0015] 2. The frequency range of the vibration exciter of the utility model is easy to adjust. In addition to directly adjusting the motor speed through the speed regulator, the frequency range of the vibration exciter can also be increased by changing the tooth ratio of the bevel gear.

[0016] 3. Since the utility model is a precision controllable seismic source, the signal repeatability is good. Even if the single output of the vibrator is small, the signal-to-noise ratio can be improved by multiple superpositions to achieve detection in a larger range.

[0017] 4. Since the utility model is highly integrated, small in size and light in weight, it is more suitable for areas with complex terrain such as cities and is easier to move and transport than large-tonnage controllable source vehicles or large-scale source devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a small portable controllable vibrator device proposed by the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the box body proposed by the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the cover body proposed by the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the base plate proposed by the utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the bevel gear proposed in the utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the eccentric proposed by the utility model;

[0024] Figure 7 This is a structural schematic diagram of the bearing seat proposed by the utility model;

[0025] Figure 8 A schematic diagram of the structure of the bracket proposed by the utility model;

[0026] Fig. 9 This is a schematic diagram of the device connection during field observation proposed by the utility model;

[0027] Fig.10 This is a schematic diagram of installing the eccentric of the vibrator with two different output directions proposed by the utility model.

[0028] In the figure: 1-box, 11-navigation jack, 12-first base plate mounting hole, 13-cover body mounting hole, 2-cover body, 3-base plate, 31-second base plate mounting hole, 32-mounting platform, 33-mounting groove, 34-first bearing seat mounting hole, 35-bracket mounting hole, 4-bevel gear, 5-eccentric, 6-optical axis, 7-bearing seat, 71-shaft hole, 72-second bearing seat mounting hole, 8-connector, 9-bracket, 91-first positioning groove, 92-second positioning groove, 93-through hole. DETAILED DESCRIPTION

[0029] The present invention will be further explained below in conjunction with specific embodiments.

[0030] Reference Figure 1 , Figure 3 , Figure 5 and Figure 6The small portable controllable vibrator device proposed by the utility model comprises a box body 1 with an upper opening and a storage space, a cover body 2 is detachably provided on the upper end of the box body 1, a servo motor is provided in the storage space of the box body 1, a connector 8 is provided at the output end of the servo motor, and three bevel gears 4 are also provided, one end of the connector 8 is connected to a bevel gear 4 through an optical axis, and the other two bevel gears 4 are transmission-connected to the bevel gear 4 connected to the connector 8, and the other two bevel gears 4 are respectively connected to two eccentrics 5 through the optical axis, and the rotation of the bevel gears driven by the servo motor realizes the coaxial and reverse rotation of the two eccentrics 5, and the distribution form of the two eccentrics can be as follows Fig.10 The two situations shown make the resultant centrifugal force of the eccentric move vertically downward or horizontally.

[0031] The vibration exciter of the utility model only needs one servo motor for power output, and because the bevel gear is used for steering, the rotation phases of the two eccentrics are strictly opposite, and there is no need to use a GPS module to calibrate and control the rotation of the eccentric. The frequency range of the vibration exciter of the utility model is easy to adjust. In addition to directly adjusting the motor speed through the speed regulator, the frequency range of the vibration exciter can also be increased by changing the gear ratio of the bevel gear. Figure 1 A 1:1 bevel gear pair is used. Without changing the servo motor speed and with sufficient power, a bevel gear set with a gear ratio of 2:1 or higher can be replaced, thereby doubling or even multiplying the frequency of the controllable vibrator.

[0032] In addition, refer to Figure 1 and Figure 4 A bottom plate 3 is arranged in the accommodating space of the box body 1, and a bracket 9 is installed on the bottom plate 3. The bracket 9 is used to install the servo motor. A mounting platform 32 is also arranged on the upper end of the bottom plate 3. The mounting platform 32 is provided with three groups of mounting grooves 33. The bearing seat 7 is installed in the mounting groove 33 through a plurality of first bearing seat mounting holes 34. The bevel gear 4 is arranged on the bearing seat 7.

[0033] Reference Figure 7 In order to install the bearing seat 7, the bearing seat 7 includes an axial hole 71 and a second bearing seat mounting hole 72. The axial hole 71 is used to install the bevel gear 4. The second bearing seat mounting hole 72 matches the first bearing seat mounting hole 34 to install the bearing seat 7 in the mounting groove 33.

[0034] Reference Figure 4 The bottom plate 3 also includes a second bottom plate mounting hole 31. The bottom of the box body 1 is provided with a first bottom plate mounting hole 12 matching the second bottom plate mounting hole 31 so as to mount the bottom plate 3 on the bottom of the box body 1.

[0035] Reference Figure 4 and Figure 8The base plate 3 also includes a bracket mounting hole 35, and the bracket 9 is provided with a first positioning groove 91 matching the bracket mounting hole 35 to mount the bracket 9 on the base plate 3. The bracket 9 is also provided with a second positioning groove 92 and a through hole 93 to fix the servo motor.

[0036] Reference Figure 2 The box body 1 is also provided with an air jack 11 and a cover mounting hole 13, and the cover mounting hole 13 is used for mounting the cover body 2. The air jack 11 is connected to the power supply and the computer through a power line and a signal line respectively.

[0037] Since the utility model is a precision controllable vibrator, its signal repeatability is good. Even if the single output of the vibrator is small, the signal-to-noise ratio can be improved by multiple superpositions. Since the utility model is highly integrated, small in size and light in weight, it is more suitable for complex terrain areas such as cities and easier to move and transport than large-tonnage controllable vibrator vehicles or large-scale vibrator devices.

[0038] Example 1: Monitoring the underground structure of a region over time

[0039] For field installation, please refer to Fig. 9 Since the vibrator of the present invention adopts an integrated design, there is no need to assemble the vibrator in the field. The operation is very simple during the actual observation process, and you only need to connect the servo motor control signal line and the power line. In the actual implementation process, in order to ensure the coupling between the vibrator box and the earth, the vibrator needs to be shallowly buried, and the battery or other heavy objects need to be covered on the vibrator. At the same time, the seismograph or geophone is laid out. It should be noted that a seismograph or geophone must be laid out near the vibrator.

[0040] After ensuring that the wiring is correct, the servo motor can be powered on, the vibration exciter control program on the computer can be started, and the vibration exciter can begin to perform linear frequency sweeping motion. The seismograph or geophone starts to record ground vibration. By cross-correlating or deconvolving the data of the near station with the data of other stations, wavelet compression can be performed to obtain body wave signals or surface wave signals, and then the underground structure can be studied. Due to the repeatability of the present invention, the same observation system can be used to observe again after a certain time interval (for example, 1 day or more days), and the change of the underground structure in the observation area over time can be obtained.

[0041] Of course, since the cost of the exciter is low, a large number of them can be deployed to form a phased array of exciters to cover a larger area.

[0042] Example 2: Rapid detection of underground structures in a certain area

[0043] A certain number of seismometers or geophones (greater than 5) are arranged in an equally spaced linear arrangement, and then the vibrator is placed next to the first seismometer or geophone, and then excited. If the arrangement is small and the signal-to-noise ratio of a single excitation is sufficient, a single excitation can be selected. If not, multiple excitations can be performed. The recorded signals are then superimposed and cross-correlated, and a method similar to multi-channel surface wave analysis can be used to invert the 1D velocity structure under the arrangement. Then the arrangement of the vibrator and seismometer or geophone is moved as a whole to observe the next point, and this is repeated to obtain the profile of the underground structure.

[0044] Of course, if there are enough seismometers or geophones, a large number of them can be deployed at one time, and only the exciter can be moved, and then excited near each seismometer or geophone, and then processed as before, to obtain the velocity structure profile under the arrangement.

[0045] Example 3: Detecting underground structures in combination with well observation

[0046] If there are existing wells in a certain area and seismographs or detectors are arranged in the wells, the present invention can be used to excite at different positions away from the wellhead to obtain seismic waves observed in the wells, thereby inverting the velocity structure of the area.

Claims

1. A small portable controllable vibrator device, characterized in that: The invention comprises a box body (1) with an upper opening and a storage space, the upper end of the box body (1) being detachably provided with a cover body (2), a servo motor being provided in the storage space of the box body (1), an output end of the servo motor being provided with a connector (8), and three bevel gears (4), one end of the connector (8) being connected to a bevel gear (4), the other two bevel gears (4) being transmission-connected to the bevel gear (4) connected to the connector (8), the other two bevel gears (4) being respectively connected to eccentrics (5), and the servo motor driving the rotation of the bevel gears enables the two eccentrics (5) to rotate coaxially in opposite directions.

2. The small portable controllable vibrator device according to claim 1, characterized in that: A bottom plate (3) is arranged in the accommodating space of the box body (1), a bracket (9) is mounted on the bottom plate (3), and the bracket (9) is used to mount a servo motor.

3. The small portable controllable vibrator device according to claim 2, characterized in that: A mounting platform (32) is also provided at the upper end of the base plate (3), the mounting platform (32) being provided with three groups of mounting grooves (33), a bearing seat (7) being installed in the mounting grooves (33) via a plurality of first bearing seat mounting holes (34), and the bevel gear (4) being arranged on the bearing seat (7).

4. The small portable controllable vibrator device according to claim 3, characterized in that: The bearing seat (7) comprises an axial hole (71) and a second bearing seat mounting hole (72); the axial hole (71) is used to mount the bevel gear (4); the second bearing seat mounting hole (72) matches the first bearing seat mounting hole (34) to enable the bearing seat (7) to be mounted in the mounting groove (33).

5. The small portable controllable vibrator device according to claim 2, characterized in that: The bottom plate (3) further comprises a second bottom plate mounting hole (31), and the bottom of the box body (1) is provided with a first bottom plate mounting hole (12) matching the second bottom plate mounting hole (31) so as to mount the bottom plate (3) on the bottom of the box body (1).

6. The small portable controllable vibrator device according to claim 2, characterized in that: The base plate (3) further comprises a bracket mounting hole (35), the bracket (9) is provided with a first positioning groove (91) matching the bracket mounting hole (35) so as to mount the bracket (9) on the base plate (3), and the bracket (9) is further provided with a second positioning groove (92) and a through hole (93) so as to fix the servo motor.

7. The small portable controllable vibrator device according to claim 1, characterized in that: The box body (1) is also provided with an air plug hole (11) and a cover body mounting hole (13), and the cover body mounting hole (13) is used for mounting the cover body (2).

8. The small portable controllable vibrator device according to claim 1, characterized in that: An optical axis (6) is also provided at one end of the eccentric (5) away from the bevel gear (4), and the optical axis (6) is used to connect the bevel gear (4) and the eccentric (5).

Images