Vibration impact sensor, detection precision adjusting method and vibration detection device

Abstract

The invention discloses a vibration impact sensor, a detection precision adjusting method and a vibration detection device, and relates to the technical field of seismic wave method geophysical prospecting equipment, and the vibration impact sensor comprises a metal tube, and a vibration sensing assembly and a signal generation assembly which are arranged in the metal tube; the vibration sensing assembly comprises a first spring and a second spring which are limited in the two axial ends of the metal pipe respectively and are in a stretched state, and a mass block arranged between the first spring and the second spring. In the use process of the vibration impact sensor, when the vibration impact sensor is impacted, the mass block makes contact with or is separated from the inner wall of the metal pipe, the signal generation assembly can generate and output trigger pulses when the mass block makes contact with or is separated from the inner wall of the metal pipe, and compared with an acceleration sensor with a high G value, the vibration impact sensor provided by the embodiment of the invention has the advantages that the vibration impact sensor is more stable. The measuring dead angle is only the stretching direction of the first spring or the second spring, and the measuring range is wider.

Description

Technical Field

[0001] The present application relates to the technical field of seismic wave geophysical exploration equipment, and in particular to a vibration impact sensor, a detection accuracy adjustment method and a vibration detection device. Background Art

[0002] In the field of geophysical exploration of nonferrous metal mines, seismic wave method is a mature and important detection method, and an important means to study the material structure and dynamic changes inside the earth. In actual production, a seismic source (artificial source, mechanical source or explosive) is first used to generate an excitation wave, and the acquisition module is simultaneously started to collect seismic waves propagating in the geology.

[0003] To achieve this goal, it is necessary to use detection equipment to directly detect the excitation waves generated by the earthquake source and convert them into trigger signals to start the acquisition module through wired or wireless methods. Since the propagation speed of seismic waves is very fast, the timeliness of the entire process is very high, and high-G value acceleration sensors can be used for measurement.

[0004] However, high-G acceleration sensors are directional, and vibration impact signals can only be accurately detected along their sensitive direction. When using them, detection personnel first need to determine the direction of movement of the earthquake source and correctly install the sensor to realize the trigger function.

[0005] Therefore, the present application proposes a vibration impact sensor, a detection accuracy adjustment method and a vibration detection device, which expand the sensitive direction range of vibration detection, and the function can still be triggered when there is a deviation in the installation of the vibration impact sensor. Summary of the invention

[0006] The main purpose of this application is to provide a vibration impact sensor, a detection accuracy adjustment method and a vibration detection device, aiming to solve the technical problem of limited sensitive direction of high G-value acceleration sensors.

[0007] To achieve the above objectives, this application provides the following technical solutions:

[0008] A vibration shock sensor, comprising:

[0009] Metal pipes;

[0010] The vibration sensing assembly disposed inside the metal tube comprises a first spring and a second spring respectively limited inside the axial ends of the metal tube and in a stretched state, and a mass block disposed between the first spring and the second spring, wherein the first spring, the second spring and the mass block are all suspended in the air and are located on the central axis of the metal tube;

[0011] The signal generating components are electrically connected to the vibration sensing component and the metal tube respectively, and are used to generate and output a trigger pulse when the mass block is in contact with the inner wall of the metal tube.

[0012] As a further improvement of the present application, the signal generating component includes a signal conditioning circuit, which is provided with a comparator U1, a resistor R1, a resistor R3, a resistor R4, a resistor R5 and a capacitor C1; the fifth pin of the comparator U1 is connected to the VCC voltage source, the second pin of the comparator is grounded, and the fourth pin of the comparator is externally connected to a signal sending device; one end of the resistor R1 is connected to the VCC voltage source, the other end of the resistor R1 is respectively connected to the resistor R5 and the third pin of the comparator U1, and the other end of the resistor R5 is grounded; the first pin of the trigger switch S1 is electrically connected to the mass block and to the VCC voltage source, the second pin of the trigger switch S1 is electrically connected to the metal tube, and is respectively connected to one end of the resistor R3 and the resistor R4, the other end of the resistor R3 is respectively connected to the capacitor C1 and the first pin of the comparator U1, and the other ends of the resistor R4 and the capacitor C1 are both grounded.

[0013] As a further improvement of the present application, the vibration sensing assembly also includes a first limit block and a second limit block, respectively arranged at two ends of the first spring and the second spring that are away from each other. The two ends of the first spring and the second spring that are away from each other are respectively located on the first limit block and the second limit block through a first fixing pin and a second fixing pin. The first limit block and the second limit block are away from each other to change the stretching length of the first spring and the second spring.

[0014] As a further improvement of the present application, the inner wall of the metal tube is provided with a first threaded segment and a second threaded segment, the first limit block is threadedly connected to the first threaded segment, and the second limit block is connected to the second threaded segment, respectively driving the first limit block and the second limit block to rotate clockwise / counterclockwise around the central axis of the metal tube so that the first limit block and the second limit block move away from / closer to each other.

[0015] As a further improvement of the present application, the first limit block and the second limit block are respectively provided with a first countersunk hole and a second countersunk hole with a hole diameter decreasing toward the mass block, the first fixing pin and the second fixing pin are both bolts, the head ends of the first fixing pin and the second fixing pin respectively pass through the first countersunk hole and the second countersunk hole, and are respectively connected to the two ends of the first spring and the second spring that are far away from each other, and the tail ends of the first fixing pin and the second fixing pin are respectively limited at the two ends of the first countersunk hole and the second countersunk hole that are far away from each other, thereby limiting the first spring and the second spring.

[0016] As a further improvement of the present application, the signal generating assembly also includes a spring pin and a copper ring, one end of the spring pin abuts against one end of the first fixing pin away from the first spring, the other end of the spring pin is connected to the first pin of the trigger switch S1, the outer ring of the copper ring abuts against the inner wall of the metal tube, and the copper ring is connected to the second pin of the trigger switch S1, so that the signal generating assembly is electrically connected to the inner wall of the metal tube and the mass block respectively.

[0017] As a further improvement of the present application, the vibration impact sensor also includes a sealing cover movably mounted on an end of the metal tube away from the second spring, and the sealing cover seals the space where the signal generating component is located, thereby protecting the signal generating component.

[0018] As a further improvement of the present application, the cross section of the mass block perpendicular to the central axis of the metal tube is circular, so that the mass block is isotropic when moving.

[0019] A method for adjusting the detection accuracy of a vibration impact sensor, the method comprising:

[0020] Measure the stiffness coefficients of the first spring and the second spring, the distance from the mass block to the inner wall of the metal tube, the weight of the mass block, the initial length of the first spring and the second spring, and the total length after stretching and installation;

[0021] According to the stiffness coefficients of the first spring and the second spring, the distance from the mass block to the inner wall of the metal tube, the weight of the mass block, the initial length of the first spring and the second spring, and the total length after stretching and installation, the impact acceleration threshold of the mass block is calculated. The calculation expression of the impact acceleration threshold is:

[0022]

[0023] In the formula, I g is the impact acceleration value, the unit is gravity acceleration g; K is the stiffness coefficient of the first spring and the second spring; A is the distance between the mass block and the inner wall of the metal tube; M is the weight of the mass block; L0 is the initial length of the first spring and the second spring; L1 is the total length of the first spring and the second spring after stretching and installation.

[0024] A vibration detection device comprises at least two vibration impact sensors, wherein the central axes of metal tubes of each two vibration impact sensors are not parallel.

[0025] The technical solution provided by this application may have the following beneficial effects:

[0026] During use of the present application, the mass block is pulled by the first spring and the second spring and suspended in the metal tube. When the vibration impact sensor is impacted, the mass block continues to move forward along the original direction of movement, and under the action of inertia and the pulling action of the first spring and the second spring, it swings back and forth and contacts / separates from the inner wall of the metal tube. The signal generating component generates and outputs a trigger pulse when the mass block contacts the inner wall of the metal tube. Compared with a high-G value acceleration sensor, the vibration impact sensor provided in this embodiment has a measurement blind angle only in the stretching direction of the first spring or the second spring, thereby expanding the sensitive direction range of vibration detection. When there is a deviation in the installation of the vibration impact sensor, the function can still be triggered. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. It is obvious that the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic diagram of the internal structure of a vibration shock sensor Figure 1 ;

[0029] Figure 2 A schematic diagram of the internal structure of a vibration shock sensor Figure 2 ;

[0030] Figure 3 yes Figure 1 The conditioning circuit diagram of the signal generating component in the middle;

[0031] Figure 4 A schematic diagram of the internal structure of a vibration shock sensor Figure 3 ;

[0032] Figure 5 yes Figure 1 Schematic diagram of the structure of the middle vibration sensing component;

[0033] Reference numerals:

[0034] 1. Metal tube; 11. First threaded section; 12. Second threaded section; 2. Vibration sensing assembly; 21. First spring; 22. Second spring; 23. Mass block; 24. First limit block; 241. First countersunk hole; 25. Second limit block; 251. Second countersunk hole; 26. First fixing pin; 27. Second fixing pin; 3. Signal generating assembly; 31. Spring ejector pin; 32. Copper ring; 4. Sealing cover. DETAILED DESCRIPTION

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] 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 this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean 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 application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics 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.

[0040] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0041] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0042] Figure 1 An embodiment of a vibration shock sensor of the present application is shown, see Figure 1 In this embodiment, the vibration impact sensor includes: a metal tube 1, and a vibration sensing component 2 and a signal generating component 3 arranged in the metal tube 1, and the signal generating component 3 is electrically connected to the metal tube 1 and the vibration sensing component 2 respectively.

[0043] Among them, see Figure 1 The vibration sensing component 2 includes a first spring 21, a second spring 22 and a mass block 23. The first spring 21 and the second spring 22 are respectively limited to the inside of the two ends of the metal tube 1 and are in a stretched state. The mass block 23 is respectively connected to the ends of the first spring 21 and the second spring 22 that are close to each other. The first spring 21, the second spring 22 and the mass block 23 are all suspended and are on the central axis of the metal tube 1. When the vibration impact sensor provided in this embodiment is impacted, the mass block 23 continues to move forward along the original direction of movement, and under the action of inertia and the pulling action of the first spring 21 and the second spring 22, it swings back and forth and contacts / separates from the inner wall of the metal tube 1. The signal generating component 3 generates and outputs a trigger pulse when the mass block 23 touches the inner wall of the metal tube 1. Compared with the high G value acceleration sensor, the vibration impact sensor provided in this embodiment has a measurement dead angle only in the stretching direction of the first spring 21 or the second spring 22, which expands the sensitive direction range of vibration detection. When there is a deviation in the installation of the vibration impact sensor, the function can still be triggered.

[0044] Optionally, the metal tube 1 , the first spring 21 , the second spring 22 and the mass block 23 are all made of conductive metal materials, and the first spring 21 and the second spring 22 are both insulated and connected to the metal tube 1 to prevent the vibration shock sensor from short-circuiting.

[0045] Optionally, the cross section of the inner wall of the metal tube 1 along its central axis and the cross section of the mass block 23 perpendicular to the central axis of the metal tube 1 are both circular, so that the mass block 23 is isotropic when moving. The mass block 23 can be a spherical and cylindrical structure.

[0046] Further, see Figure 2 The vibration sensing component 2 also includes a first limit block 24, a second limit block 25, a first fixing pin 26 and a second fixing pin 27. The first limit block 24 and the second limit block 25 are respectively arranged at two ends of the first spring 21 and the second spring 22 that are far away from each other. The two ends of the first spring 21 and the second spring 22 that are far away from each other are respectively limited on the first limit block 24 and the second limit block 25 by the first fixing pin 26 and the second fixing pin 27. By controlling and changing the distance between the first limit block 24 and the second limit block 25, the stretching length of the first spring 21 and the second spring 22 can be changed, thereby changing the measurement accuracy of the vibration impact sensor.

[0047] Further, see Figure 2 The inner wall of the metal tube 1 is provided with a first threaded segment 11 and a second threaded segment 12, the first limit block 24 is threadedly connected to the first threaded segment 11, and the second limit block 25 is connected to the second threaded segment 12, and the first limit block 24 and the second limit block are driven to rotate clockwise / counterclockwise around the central axis of the metal tube 1 respectively, so that the first limit block 24 and the second limit block 25 can move away from / close to each other, thereby changing the distance between the first limit block 24 and the second limit block 25.

[0048] Further, see Figure 2 The first limit block 24 and the second limit block 25 are respectively provided with a first countersunk hole 241 and a second countersunk hole 251 with decreasing diameters of the hole and the mass block 23, the first fixing pin 26 and the second fixing pin 27 are both bolts, the head ends of the first fixing pin 26 and the second fixing pin 27 respectively penetrate the first countersunk hole and the second countersunk hole 251, and are respectively connected to the two ends of the first spring 21 and the second spring 22 that are far away from each other, and the tail ends of the first fixing pin 26 and the second fixing pin 27 are respectively limited at the two ends of the first countersunk hole 241 and the second countersunk hole 251 that are far away from each other, so as to limit the first spring and the second spring 22. The purpose of such a design is to avoid torsional interference on the first spring 21 and the second spring 22 when the first limit block 24 and the second limit block respectively rotate around the central axis of the metal tube 1.

[0049] Further, see Figure 3The signal generating component 3 includes a conditioning circuit, which is provided with a comparator U1, a resistor R1, a resistor R3, a resistor R4, a resistor R5 and a capacitor C1; the fifth pin of the comparator U1 is connected to the VCC voltage source, the second pin of the comparator is grounded, and the fourth pin of the comparator is externally connected to a signal sending device; one end of the resistor R1 is connected to the VCC voltage source, the other end of the resistor R1 is respectively connected to the resistor R5 and the third pin of the comparator U1, and the other end of the resistor R5 is grounded; the first pin of the trigger switch S1 is electrically connected to the mass block 23 and to the VCC voltage source, the second pin of the trigger switch S1 is electrically connected to the metal tube 1, and is respectively connected to one end of the resistor R3 and the resistor R4, the other end of the resistor R3 is respectively connected to the capacitor C1 and the first pin of the comparator U1, and the other ends of the resistor R4 and the capacitor C1 are both grounded.

[0050] It should be noted that the first pin of the comparator U1 is the inverting end (IN-), the second pin is the grounding end (VCC- / GND), the third pin is the same direction end (IN+), the fourth pin is the power input end (VCC), and the fifth pin is the signal output end (OUT).

[0051] Optionally, the model of the comparator U1 is TL331IDBVR, the specifications of the resistors R1 , R3 , R4 , and R5 are 10KΩ, 10KΩ, 1MΩ, and 10KΩ respectively, and the specification of the capacitor C1 is 10nF.

[0052] Let's take an example to illustrate how the conditioning circuit works:

[0053] (1) When the trigger switch S1 is disconnected, the voltage at the in-phase terminal (IN+) of the comparator U1 is R5 / (R1+R5)*VCC, and the voltage at the in-phase terminal (IN-) is 0. The voltage at the in-phase terminal is higher than the voltage at the in-phase terminal. At this time, its output terminal (OUT) is in a high-impedance state, and the voltage is VCC.

[0054] (2) When switch S1 is closed, the power supply VCC passes resistance R3 quickly gives capacitance C1 is charged, and its charging time constant is T1=R3*C1. The voltage of capacitor C1 is the voltage of the reverse terminal (IN-) of U1. When the voltage of the reverse terminal of comparator U1 is higher than the voltage of the in-phase terminal, the state of its output terminal (OUT) changes, and the voltage becomes 0. If a constant current source is used for power supply, the voltage of VCC will also drop at this time, thereby giving a trigger signal.

[0055] (3) When the switch S1 is disconnected again, the capacitor C1 discharges through the resistors R3 and R4, and its discharge time constant T2 = (R3 + R4) * C1. The voltage of the capacitor C1 is the voltage of the reverse terminal (IN-) of U1. When the voltage of the reverse terminal of the comparator U1 is lower than the voltage of the non-inverting terminal, the state of its output terminal (OUT) changes and the voltage becomes VCC; the circuit returns to its initial state.

[0056] It should be noted that when the mass block is close enough to the inner wall of the metal tube, a capacitor-like effect will occur, which is equivalent to reducing the impact acceleration threshold; when the impact force is too large, the double spring oscillator will make multiple contacts with the inner wall of the metal tube, which is equivalent to generating multiple trigger signals for a single impact. By selecting appropriate resistors R3, R4 and capacitor C1, appropriate charging time constants T1 and T2 can be obtained, thereby effectively avoiding these problems.

[0057] Further, see Figure 4 The signal generating component 3 also includes a spring pin 31 and a copper ring 32. One end of the spring pin 31 abuts against one end of the first fixing pin 26 away from the first spring 21, and the other end of the spring pin 31 is connected to the first pin of the trigger switch S1. The outer ring of the copper ring 32 abuts against the inner wall of the metal tube 1, and the copper ring 32 is connected to the second pin of the trigger switch S1, so that the signal generating component 3 is electrically connected to the inner wall of the metal tube 1 and the mass block 23 respectively, so that when the mass block 23 contacts the inner wall of the metal tube 1, the trigger switch S1 is connected.

[0058] Optionally, the conditioning circuit is arranged in a circular double-layer circuit board, the diameter of the circuit board is slightly smaller than the inner diameter of the metal tube 1, the spring ejector 31 is arranged on the end face of the circuit board adjacent to the mass block 23, and the copper ring 32 is arranged on the end face of the circuit board away from the mass block 23.

[0059] Further, see Figure 4 The vibration impact sensor also includes a sealing cover 4. The signal generating component 3 is arranged on the side of the first limit block 24 away from the mass block 23. The outer wall of the metal tube 1 away from the second limit block 25 is provided with an external thread. The sealing cover 4 is provided with an internal thread adapted to the external thread of the cover. The sealing cover 4 is threadedly connected to the end of the metal tube 1 away from the second limit block 25 to make the space where the signal generating component 3 is located airtight to prevent water vapor outside the metal tube 1 from affecting the signal generating component and causing damage to the equipment.

[0060] Take the following example to illustrate the assembly process of a vibration shock sensor:

[0061] (1): The mass block 23 is connected to the first spring 21 and the second spring 22 respectively, and the end of the first spring 21 away from the mass block 23 is connected to the first limit block 24;

[0062] (2): Screw the first limit block 24 into the end of the metal tube 1 with the external thread, and make the end of the second spring 22 away from the mass block 23 exposed from the end of the metal tube 1 without the external thread;

[0063] (3): Connect the second mass block 23 to the end of the second spring 22 exposed from the metal tube 1, and screw the second mass block 23 into the metal tube 1;

[0064] (4): Adjust the positions of the first mass block 23 and the second mass block 23 in the metal tube 1 respectively, so that the first spring 21 and the second spring 22 are in a stretched state;

[0065] (5): Install the signal generating assembly 3 in the metal tube 1, make the spring pin 31 abut against the end of the first fixing pin 26 away from the mass block 23, the outer ring of the copper ring 32 abuts against the inner wall of the metal tube 1, and install the sealing joint, wherein the cable connected to the signal generating assembly 3 is led out to the outside of the vibration shock sensor through the sealing cover 4;

[0066] (6): The inside of the metal tube 1 is sealed with glue on the side of the second limit block 25 away from the mass block 23. At the same time, the area where the metal tube 1 is connected to the sealing cover 4 is coated with glue, and the sealing cover 4 is tightened before the glue solidifies.

[0067] In this embodiment, the mass block 23 is pulled by the first spring 21 and the second spring 22 and suspended in the metal tube 1. When the vibration impact sensor is impacted, the mass block 23 continues to move forward along the original direction of movement, and under the action of inertia and the pulling action of the first spring 21 and the second spring 22, it swings back and forth and contacts / separates from the inner wall of the metal tube 1. The signal generating component 3 generates and outputs a trigger pulse when the mass block 23 contacts the inner wall of the metal tube 1. Compared with the high-G value acceleration sensor, the vibration impact sensor provided in this embodiment has a measurement blind angle only in the stretching direction of the first spring 21 or the second spring 22, which expands the sensitive direction range of vibration detection. When there is a deviation in the installation of the vibration impact sensor, the function can still be triggered.

[0068] In order to adjust the detection accuracy of the vibration impact sensor, based on the above embodiment, this embodiment provides a method for adjusting the detection accuracy of the vibration impact sensor, comprising the following steps:

[0069] Step S1: measuring the stiffness coefficients of the first spring 21 and the second spring 22, the distance from the mass block 23 to the inner wall of the metal tube 1, the weight of the mass block 23, the initial lengths of the first spring 21 and the second spring 22, and the total lengths after stretching and installation;

[0070] Step S2: Calculate the impact acceleration threshold of the mass block 23 according to the stiffness coefficients of the first spring 21 and the second spring 22, the distance from the mass block 23 to the inner wall of the metal tube 1, the weight of the mass block 23, the initial length of the first spring 21 and the second spring 22, and the total length after stretching and installation.

[0071] Among them, see Figure 5 , the calculation expression of the impact acceleration threshold is:

[0072]

[0073] Wherein, Ig is the impact acceleration value, and the unit is gravity acceleration g; K is the stiffness coefficient of the first spring 21 and the second spring 22; A is the distance between the mass block 23 and the inner wall of the metal tube 1; M is the weight of the mass block 23; L0 is the initial length of the first spring 21 and the second spring 22; L1 is the total length of the first spring 21 and the second spring 22 after stretching and installation.

[0074] It should be noted that after the vibration sensing component 2 is installed, the first spring 21 and the second spring 22 are both in a stretched state. The first spring 21 and the second spring 22 are both tension springs with high stiffness coefficients, and their tension is much greater than the gravity of the spring and the mass block 23. Therefore, the influence of gravity can be ignored in the analysis of the motion process.

[0075] To further illustrate, for the selected metal round tube, first spring 21, second spring 22 and mass block 23, the stiffness coefficient K of the first spring 21 and the second spring 22, the weight M of the mass block 23, the distance A between the mass block 23 and the inner wall of the metal tube 1, and the initial length L0 of the first spring 21 and the second spring 22 are all fixed values. It is only necessary to measure the total length L1 of the first spring 21 and the second spring 22 after stretched installation to change the impact acceleration threshold Ig.

[0076] In this embodiment, the stiffness coefficients of the first spring 21 and the second spring 22, the weight of the mass block 23, the distance between the mass block 23 and the inner wall of the metal tube 1, and the initial lengths of the first spring 21 and the second spring 22 are all determined values. By measuring the total length of the first spring 21 and the second spring 22 after stretching, the acceleration threshold when the mass block 23 is impacted can be determined. Only when the shock wave received by the vibration impact sensor is greater than the shock wave corresponding to the acceleration threshold, can the vibration impact sensor output a pulse signal. In this way, the measurement accuracy of the vibration impact sensor can be adjusted to avoid the vibration impact sensor outputting a pulse signal even when it is subjected to a small interference vibration.

[0077] In order to avoid the detection blind spots of the vibration impact sensor, based on the above embodiments, this embodiment provides a vibration detection device, which includes at least two vibration impact sensors.

[0078] The central axes of the metal tubes 1 of every two vibration impact sensors are not parallel, so that vibration waves from any angle in the geology can be detected, avoiding detection blind spots.

[0079] It should be noted that the mass block 23 is limited by the stretching of the first spring 21 and the second spring 22. When the direction of the vibration wave is parallel to the central axis of the metal tube 1, the mass block 23 can only move along the stretching direction of the first spring 21 or the second spring 22 and cannot contact the inner wall of the metal tube 1.

[0080] Optionally, in this embodiment, providing two vibration shock sensors is the best embodiment.

[0081] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the present application; the dimensions of the drawings are not related to the specific objects, and the dimensions of the objects can be changed arbitrarily.

Claims

1. A vibration shock sensor, characterized in that: include: Metal pipes; The vibration sensing assembly disposed inside the metal tube comprises a first spring and a second spring respectively limited inside the axial ends of the metal tube and in a stretched state, and a mass block disposed between the first spring and the second spring, wherein the first spring, the second spring and the mass block are all suspended in the air and are located on the central axis of the metal tube; The signal generating components are electrically connected to the vibration sensing component and the metal tube respectively, and are used to generate and output a trigger pulse when the mass block is in contact with the inner wall of the metal tube.

2. The vibration shock sensor according to claim 1, characterized in that: The signal generating component includes a signal conditioning circuit, which is provided with a comparator U1, a resistor R1, a resistor R3, a resistor R4, a resistor R5 and a capacitor C1; the fifth pin of the comparator U1 is connected to the VCC voltage source, the second pin of the comparator is grounded, and the fourth pin of the comparator is externally connected to a signal sending device; one end of the resistor R1 is connected to the VCC voltage source, the other end of the resistor R1 is respectively connected to the resistor R5 and the third pin of the comparator U1, and the other end of the resistor R5 is grounded; the first pin of the trigger switch S1 is electrically connected to the mass block and to the VCC voltage source, the second pin of the trigger switch S1 is electrically connected to the metal tube, and is respectively connected to one end of the resistor R3 and the resistor R4, the other end of the resistor R3 is respectively connected to the capacitor C1 and the first pin of the comparator U1, and the other ends of the resistor R4 and the capacitor C1 are both grounded.

3. The vibration shock sensor according to claim 2, characterized in that: The vibration sensing assembly also includes a first limit block and a second limit block respectively arranged at two ends of the first spring and the second spring that are away from each other. The two ends of the first spring and the second spring that are away from each other are respectively located on the first limit block and the second limit block through a first fixing pin and a second fixing pin. The first limit block and the second limit block are away from each other to change the stretching length of the first spring and the second spring.

4. The vibration shock sensor according to claim 3, characterized in that: The inner wall of the metal tube is provided with a first thread segment and a second thread segment, the first limit block is threadedly connected to the first thread segment, and the second limit block is connected to the second thread segment, driving the first limit block and the second limit block to rotate clockwise / counterclockwise around the central axis of the metal tube respectively, so that the first limit block and the second limit block move away from / closer to each other.

5. The vibration shock sensor according to claim 4, characterized in that: The first limiting block and the second limiting block are respectively provided with a first countersunk hole and a second countersunk hole with a decreasing aperture diameter toward the mass block; the first fixing pin and the second fixing pin are both bolts; the head ends of the first fixing pin and the second fixing pin respectively pass through the first countersunk hole and the second countersunk hole, and are respectively connected to the two ends of the first spring and the second spring that are away from each other; the tail ends of the first fixing pin and the second fixing pin are respectively limited at the two ends of the first countersunk hole and the second countersunk hole that are away from each other, thereby limiting the first spring and the second spring.

6. The vibration shock sensor according to claim 5, characterized in that: The signal generating assembly also includes a spring pin and a copper ring, one end of the spring pin abuts against one end of the first fixing pin away from the first spring, the other end of the spring pin is connected to the first pin of the trigger switch S1, the outer ring of the copper ring abuts against the inner wall of the metal tube, and the copper ring is connected to the second pin of the trigger switch S1, so that the signal generating assembly is electrically connected to the inner wall of the metal tube and the mass block respectively.

7. The vibration shock sensor according to claim 1, characterized in that: It also includes a sealing cover movably mounted on one end of the metal tube away from the second spring, and the sealing cover seals the space where the signal generating component is located, thereby protecting the signal generating component.

8. The vibration shock sensor according to claim 1, characterized in that: The cross section of the mass block perpendicular to the central axis of the metal tube is circular, so that the mass block is isotropic when moving.

9. A detection accuracy adjustment method for a vibration shock sensor according to any one of claims 1 to 8, characterized in that: The method comprises: Measure the stiffness coefficients of the first spring and the second spring, the distance from the mass block to the inner wall of the metal tube, the weight of the mass block, the initial length of the first spring and the second spring, and the total length after stretching and installation; According to the stiffness coefficients of the first spring and the second spring, the distance from the mass block to the inner wall of the metal tube, the weight of the mass block, the initial length of the first spring and the second spring, and the total length after stretching and installation, the impact acceleration threshold of the mass block is calculated. The calculation expression of the impact acceleration threshold is: In the formula, I g is the impact acceleration value, the unit is gravity acceleration g; K is the stiffness coefficient of the first spring and the second spring; A is the distance between the mass block and the inner wall of the metal tube; M is the weight of the mass block; L0 is the initial length of the first spring and the second spring; L1 is the total length of the first spring and the second spring after stretching and installation.

10. A vibration detection device, characterized in that: The invention comprises at least two vibration shock sensors, wherein the central axes of the metal tubes of each two vibration shock sensors are not parallel.

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