A capacitance and piezoelectric composite sensor for penetration fuze
By combining capacitance and piezoelectric sensing technology in the sensor, signal acquisition is achieved using the motion of mass blocks, which solves the problem of signal aliasing and inaccurate identification of traditional sensors when invasion, and improves the accuracy of metering and hole recognition.
Patent Information
- Application Number
- CN202211293439.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-10-21
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2042-10-21
AI Technical Summary
When traditional acceleration sensors penetrate, the vibration signal is severely aliased, resulting in the lack of obvious layer-through signal and weak target signal, making it difficult to accurately identify the layer and hole recognition.
The capacitance and piezoelectric composite sensor is adopted to achieve the change in the capacitance value of the parallel plate capacitor and the charge amount of the piezoelectric sensing component through the movement of the mass in the moving channel, and the capacitance and piezoelectric signals are obtained simultaneously.
It realizes the simultaneously obtaining capacitance and piezoelectric signals during the intrusion process, improves the accuracy of meter layer recognition and hole recognition, and enhances the reliability of the sensor.
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Figure CN115493625B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of capacitance sensors and piezoelectric sensors, and in particular to a capacitance and piezoelectric composite sensor for penetration fuzes. Background Art
[0002] To achieve a more optimal damage pattern with penetrating ammunition, the penetration fuze must have strong target identification capabilities. Traditional accelerometers suffer from severe vibration aliasing. To address this, they require filtering before performing layer counting and cavity identification.
[0003] Traditional acceleration sensors will produce vibration signal aliasing during penetration, resulting in unclear layer penetration signals and weak target detection signals. They need to be filtered before layer identification and hole identification can be completed. However, filtering processing can easily filter out the penetration rigid body signal and cause a certain degree of phase delay and amplitude attenuation, making it impossible to obtain the true penetration overload, which ultimately leads to layer counting errors and the inability to accurately determine the target detection time.
[0004] If a single impact sensor sensitive to projectile velocity is used, its signal adhesion is not obvious, and accurate layer counting can be achieved, but its signal convergence speed is too fast, and it cannot accurately identify the target release moment. If a single capacitance sensor sensitive to displacement is used, its signal unloading characteristics are more obvious, and it can accurately determine the target release moment when identifying holes in thick targets. However, because its signal is greatly affected by displacement changes, its signal will also experience adhesion during the layer counting and identification process.
[0005] In order to improve the utilization efficiency of penetrating ammunition, reduce costs and enable penetrating ammunition to obtain a better damage mode, its penetrating fuze needs to take into account the identification of different targets in order to improve its multi-target strike capability. Summary of the Invention
[0006] In view of this, the present invention provides a capacitance and piezoelectric composite sensor for penetration fuze, which can obtain capacitance and piezoelectric signals at the same time when penetrating hard targets, and can strike both multi-layer thin targets and single-layer thick targets, so as to accurately obtain penetration signals and precisely control the post-target explosion point, and provide real-time and accurate data for layer identification and cavity identification.
[0007] In order to solve the above technical problems, the present invention is implemented as follows.
[0008] A capacitance and piezoelectric composite sensor for a penetration fuze, comprising:
[0009] a shell;
[0010] A movable channel is provided in the housing; one end of the movable channel is connected to the fixed electrode plate, and the other end is connected to the piezoelectric sensor assembly; the piezoelectric sensor assembly is insulated from the housing and leads to a piezoelectric signal lead; an upper electrode is provided in the middle of the lower surface of the fixed electrode plate, and an annular electrode is provided around it, and the upper electrode and the annular electrode are electrically connected to the fixed and moving electrode plate leads respectively;
[0011] A conductive mass moves within the moving channel under the action of inertial force; in an initial state, the upper surface of the mass contacts the fixed electrode via a pre-compressed, conductive elastic component; the upper surface of the mass does not contact the annular electrode; a layer of insulating dielectric film is formed on the lower surface of the fixed electrode to insulate the upper electrode from the upper surface of the mass and provide initial capacitance; the mass is in close contact with the housing, and the housing is in close contact with the annular electrode on the lower surface of the fixed electrode, forming a moving electrode circuit;
[0012] When the sensor is in the penetration state, the mass block compresses the elastic component under the action of inertial force, breaking away from the contact with the fixed electrode plate and moving toward the piezoelectric sensor component, causing the capacitance of the parallel plate capacitor to change; when the mass block continues to move until it contacts the piezoelectric sensor component, the piezoelectric sensor component generates a piezoelectric effect;
[0013] The piezoelectric sensing component outputs a piezoelectric signal according to the pressure applied by the mass block.
[0014] Preferably, the moving channel provides movement space for the mass block and accommodation space for the elastic component; the moving channel includes a first section and a second section, the inner diameter of the first section is larger, and the inner diameter of the second section is smaller; the mass block includes a large end and a small end; the large end cooperates with the first section, and the small end cooperates with the second section, so that the mass block moves along the moving channel; one end of the two ends of the elastic component contacts the bottom surface of the large end, and the other end contacts the upper step surface formed between the first section and the second section.
[0015] Preferably, the piezoelectric sensing assembly includes a buffer pad, a conductive sheet, an upper gasket, a piezoelectric sheet, a lower gasket, a conductive seat, and a rear gasket stacked in sequence from top to bottom; the conductive sheet and the conductive seat each lead out a lead for a piezoelectric signal; the piezoelectric sheet is in close contact with the conductive sheets and the conductive seat on its upper and lower surfaces; the annular upper gasket and the lower gasket provide vibration damping and buffering for the piezoelectric sheet; the conductive seat is insulated from the outer shell, and the buffer pad realizes insulation between the mass block and the conductive sheet.
[0016] Preferably, the layers in the piezoelectric sensing assembly are assembled together by a non-conductive outer sleeve and an inner sleeve to achieve insulation from the outer shell; the inner sleeve is used to fix the conductive seat, and the outer sleeve is used to fix the buffer pad, conductive sheet, upper gasket, piezoelectric sheet, lower gasket, and inner sleeve.
[0017] Preferably, the upper gasket and the lower gasket are made of rubber.
[0018] Preferably, the shell is a cylindrical structure with grooves on the top and bottom surfaces for mounting the fixed electrode and the piezoelectric sensor assembly; an axial wiring groove is provided on the outer surface of the cylindrical structure for leading the leads of the piezoelectric sensor assembly out of the sensor.
[0019] Preferably, it further includes a partition and an upper pressure screw; the upper pressure screw and the lower pressure screw are respectively installed at the two ends of the shell; the upper pressure screw applies pressure to the partition so that the partition is in close contact with the fixed electrode plate, and the partition insulates the upper pressure screw from the fixed electrode plate, and the upper pressure screw and the partition are provided with lead outlets.
[0020] Preferably, it further comprises a pressing screw, which enables the conductive seat to be tightly embedded in the inner sleeve; the conductive seat and the pressing screw are insulated by a rear gasket.
[0021] Preferably, the elastic element is a spring.
[0022] Beneficial effects:
[0023] (1) When the sensor is in the penetration state, it will obtain the capacitive sensor signal and the piezoelectric sensor signal at the same time, making the layer identification and hole identification more accurate and improving the reliability of the sensor.
[0024] (2) The parallel plate capacitor in the present invention adopts a distance-type capacitor. When the sensor is in the state of penetrating into the target, the mass block begins to move gradually from the initial state toward the piezoelectric plate, and the capacitance of the sensor continues to decrease; when in the process of penetration, the mass block moves to the maximum limit, and the capacitance of the sensor will remain fixed, while the piezoelectric plate will produce a change in the amount of charge; when the sensor is in the state of penetrating out of the target, the mass block leaves the maximum limit, the piezoelectric plate recovers its deformation, the amount of charge gradually decreases, and the capacitance of the sensor begins to increase until it completely leaves the target, and the sensor returns to its initial state.
[0025] (3) The present invention uses a mass block as both the moving electrode of the sensor capacitor part and the impact head of the piezoelectric sensor, and uses a spring to switch the state, which has a simple structure and a small size.
[0026] (4) In a preferred embodiment of the present invention, the piezoelectric sensor assembly is assembled through an inner and outer jacket, and is insulated from the outer jacket.
[0027] (5) When the sensor is in the state of penetrating the target, the penetration overload of tens of thousands of g disappears instantly, and the inertial force on the mass block 3 decreases rapidly from tens of thousands of g to the spring resistance value. Under the action of the spring 9, the mass block 3 is in the return state. At this time, the charge output of the sensor piezoelectric piece decreases rapidly to zero, and the sensor capacitance increases from the minimum capacitance. Since the sensor capacitance waveform changes from the platform segment to the step segment when the projectile penetrates the target, it has obvious characteristics, which can be used as a basis for judging whether the target has been penetrated.
[0028] (6) Since the piezoelectric signal of the sensor has the largest charge change only when the projectile penetrates into the target and enters the target plate, the piezoelectric part of the sensor is only sensitive to the layer penetration signal, which is beneficial to layer identification; the capacitance signal of the sensor is always in the platform section when the projectile penetrates into the target plate, and when penetrating into and out of the target, the capacitance signal of the sensor has a step-like rising section and falling section, so it is sensitive to the target entry and exit signals, which is beneficial to hole identification. To a certain extent, it solves the problem of traditional acceleration sensors aliasing the layer penetration signal and the unclear target exit signal. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 It is a structural schematic diagram of the present invention;
[0030] Figure 2 It is a structural diagram of the fixed plate;
[0031] In the figure: 1-upper pressure screw, 2-fixed electrode, 3-mass block, 4-piezoelectric sheet, 5-1 upper gasket, 5-2 lower gasket, 6-conductive sheet, 7-conductive seat, 8-diaphragm, 9-spring, 10-housing, 11-buffer pad, 12-outer sleeve, 13-inner sleeve, 14-rear gasket, 15-lower pressure screw, 16-insulating dielectric film, 17-upper electrode, 18-annular electrode. DETAILED DESCRIPTION
[0032] The present invention is described in detail below with reference to the accompanying drawings and embodiments.
[0033] This invention provides a composite capacitance and piezoelectric sensor for penetration fuzes. This sensor can reliably acquire penetration data by simultaneously detecting changes in both the sensor's capacitance and charge during penetration, providing a foundation for acquiring both target-offset and layer-penetration signals. In this solution, a mass acts as both the moving plate of the sensor's capacitance component and the impact tip of the piezoelectric sensor. This allows for simultaneous acquisition of both the sensor's capacitance change signal and the piezoelectric material's charge change signal during penetration.
[0034] See attached Figure 1This penetration fuze uses a capacitance and piezoelectric composite sensor. The sensor comprises a housing 10 with a movable channel disposed therein. One end of the movable channel is connected to the fixed electrode plate 2, and the other end is connected to the piezoelectric sensing assembly. The piezoelectric sensing assembly is insulated from the housing and provides piezoelectric signal leads. An upper electrode 17 is disposed in the middle of the lower surface of the fixed electrode plate 2, and an annular electrode 18 is disposed around the periphery. The upper electrode 17 and the annular electrode 18 are electrically connected to the leads of the fixed and moving electrodes, respectively. A conductive mass 3 is disposed in the movable channel. Mass 3 moves within the movable channel under the action of inertia. In the initial state, the upper surface of mass 3 contacts the fixed electrode plate 2 via a pre-compressed, conductive elastic component 9. The upper surface of mass 3 does not contact the annular electrode 18. A layer of insulating dielectric film 16 is disposed on the lower surface of the fixed electrode plate 2 to insulate the upper electrode 17 from the upper surface of mass 3 and provide initial capacitance. Mass 3 is in close contact with the housing 10, which in turn is in close contact with the annular electrode 18 on the lower surface of the fixed electrode plate 2, forming a moving electrode circuit.
[0035] When the sensor is in the penetration state, the mass block 3 compresses the elastic component 9 under the action of inertial force to break away from the contact with the fixed electrode 2, and moves toward the piezoelectric sensor component, causing the capacitance of the parallel plate capacitor to change; when the mass block continues to move until it contacts the piezoelectric sensor component, the piezoelectric sensor component generates a piezoelectric effect; the piezoelectric sensor component outputs a piezoelectric signal according to the pressure applied by the mass block 3.
[0036] It can be seen that the parallel plate capacitor of the present invention adopts a distance-type capacitor. When the sensor is in the state of penetrating into the target, the mass block begins to gradually move from the initial state toward the piezoelectric plate, and the sensor capacitance continuously decreases. When in the process of penetration, the mass block moves to the maximum limit, at which point the sensor capacitance remains fixed, and the piezoelectric plate generates a change in charge. When the sensor is in the state of penetrating out of the target, the mass block leaves the maximum limit, the piezoelectric plate recovers its deformation, the charge gradually decreases, and the sensor capacitance begins to increase until it is completely out of the target and returns to its initial state. This achieves the effect of simultaneously obtaining the capacitive sensor signal and the piezoelectric sensor signal, making layer identification and hole identification more accurate and improving the reliability of the sensor.
[0037] See also Figure 1In a preferred embodiment of the present invention, a capacitance and piezoelectric composite sensor for a penetration fuze includes an upper pressure screw 1, a fixed electrode plate 2, a mass block 3, a piezoelectric sheet 4, upper and lower gaskets 5-1 and 5-2, a conductive sheet 6, a conductive seat 7, a diaphragm 8, a spring 9, a housing 10, a cushion 11, an outer sleeve 12, an inner sleeve 13, a rear gasket 14, a lower pressure screw 15, an insulating dielectric film 16, an upper electrode 17, and an annular electrode 18. The fixed electrode plate ring, the housing, and the mass block need to form a dynamic electrode circuit. The upper pressure screw, mass block, piezoelectric sheet, conductive sheet, conductive seat, spring, housing, lower pressure screw, upper electrode, and annular electrode all need to be conductive, and therefore are all made of metal; the mass block can be made of aluminum alloy.
[0038] The upper pressure screw 1 has a circular lead-in hole in the center of its surface, with two circular grooves on both sides of the hole for fastening the upper pressure screw to the housing. The lower pressure screw 15 has no lead-in hole on its surface, but has circular grooves for fastening the lower pressure screw to the housing. Both the upper pressure screw 1 and the lower pressure screw 15 are connected to the housing via threads.
[0039] The upper pressure screw 1 makes the partition 8 and the fixed electrode plate 2 in close contact, and the partition 8 makes the fixed electrode plate 2 and the upper pressure screw 1 insulated. Figure 2 As shown, the upper surface of the fixed electrode plate 2 has fixed and moving electrode lead pads, and the center of the lower surface of the fixed electrode plate 2 is connected to the upper electrode 17, and an annular electrode 18 is provided around the upper electrode. The fixed electrode lead pad is electrically connected to the upper electrode 17, and the moving electrode lead pad is electrically connected to the annular electrode 18 through a process (this connection relationship is not shown in the figure).
[0040] The mass block 3 is supported by a spring 9 to provide initial preload. The lower surface of the fixed electrode 2 is provided with an insulating dielectric film 16 to achieve insulation between the upper electrode 17 and the upper surface of the mass block 3 and provide initial capacitance. The mass block 3 is in close contact with the outer shell 10, and the outer shell 10 is in close contact with the annular electrode 18 on the lower surface of the fixed electrode 2, forming a moving electrode circuit.
[0041] See also Figure 1The piezoelectric sensor assembly is composed of a buffer pad 11, a conductive sheet 6, an upper gasket 5-1, a piezoelectric sheet 4, a lower gasket 5-2, a conductive seat 7, and a rear gasket 14 stacked in sequence from top to bottom. The conductive sheet 6 and the conductive seat 7 each extend a piezoelectric signal lead. The piezoelectric sheet 4 is in close contact with the conductive sheet 6 and the conductive seat 7 on its upper and lower surfaces. The annular upper gasket 5-1 and lower gasket 5-2 provide vibration damping for the piezoelectric sheet 4 and are preferably supported by rubber. The conductive seat 7 is insulated from the housing, and the buffer pad 11 provides insulation between the mass block 3 and the conductive sheet 6. The pressing screw 15 makes the conductive seat 7 tightly embedded in the inner sleeve 13. The inner sleeve 13 is in close contact with the outer shell 10 and is insulated from it, thereby achieving insulation between the side of the conductive seat 7 and the outer shell 10; the rear gasket 14 achieves insulation between the lower surface of the conductive seat 7 and the pressing screw 15; the annular gaskets on the upper and lower sides of the piezoelectric plate 4 are embedded in the outer sleeve 12 together with the conductive plate 6, the buffer pad 11 and the inner sleeve 13.
[0042] The middle part of the housing 10 is a moving channel, and its inner diameter is different from that of the upper and lower sides, so that there is space for relative movement between the mass block 3 and the fixed electrode plate 2 and the piezoelectric sheet 4. Figure 1 As shown, the movable channel includes a first section and a second section, the inner diameter of the first section is larger, and the inner diameter of the second section is smaller; the mass block includes a large end and a small end; the large end cooperates with the first section, and the small end cooperates with the second section, so that the mass block 4 moves along the movable channel; one end of the elastic component contacts the bottom surface of the large end, and the other end contacts the upper step surface formed between the first section and the second section.
[0043] Spring 9 constitutes the inertial system in the sensor, which provides initial pre-pressure so that when the sensor is not in the penetration state, the mass block is in close contact with the lower surface of the fixed electrode plate. At this time, the thickness of the insulating dielectric film is the distance between the upper electrode and the moving electrode plate circuit.
[0044] The outer diameter of the inner sleeve 13 is slightly smaller than the inner diameter of the outer sleeve 12, and the outer diameter of the conductive seat 7 is slightly smaller than the inner diameter of the inner sleeve 13, so that the conductive seat 7 can be tightly embedded in the inner sleeve 13, and the inner sleeve 13 can be tightly embedded in the outer sleeve 12 together with the upper and lower gaskets 5, the piezoelectric sheet 4, the conductive sheet 6 and the buffer pad 11, so that the piezoelectric part of the sensor is insulated from the outer shell laterally as a whole; the upper surface of the piezoelectric part is insulated from the mass block 3 through the buffer pad 11, and the lower surface is insulated from the downward screw 15 through the rear gasket 14.
[0045] There are two through holes on each side wall of the housing 10, and there is an elongated groove between the two through holes on one side for placing wires; due to the elongated groove, the diameter between the left and right through holes is slightly smaller than the maximum diameter of the housing; the leads of the conductive sheet 6 and the conductive seat 7 are led out from the through holes on both sides of the lower half of the housing 10, and after passing through the elongated groove, they are penetrated by the through holes on both sides of the upper half of the housing 10, and finally led out from the through hole on the upper pressure screw 1 together with the leads of the two pads on the upper surface of the fixed electrode plate 2; the wire is pressed into the elongated groove between the two through holes, which does not affect the diameter size of the area.
[0046] The working principle of the present invention is:
[0047] When the sensor is not in the penetration state, the mass block 3 is supported by the spring 9 to provide an initial preload. At this time, the sensor capacitance is at its maximum and the piezoelectric piece 4 does not output any charge.
[0048] When the sensor penetrates the target, the mass 3 compresses the spring 9, breaking contact with the fixed electrode 2 and moving toward the piezoelectric plate 4. During the penetration process, the sensor experiences a large overload of tens of thousands of g, causing a step-wise decrease in sensor capacitance. However, at this time, the mass is not in contact with the piezoelectric element, so the sensor does not experience any charge change, and the charge output is zero.
[0049] When the sensor is penetrating the target, under the continued high overload, mass 3 continues to move downward until it makes contact with the entirety of cushion 11, conductive sheet 6, piezoelectric sheet 4, and conductive seat 7. This generates a piezoelectric effect, causing the charge on piezoelectric sheet 4 to change. At this point, the projectile is still penetrating the target, and the sensor continues to experience a high overload of tens of thousands of g. As a result, mass 3 is subjected to inertial forces and reaches its maximum limit. At this point, spring 9 is at its maximum compression, and the sensor stabilizes at its minimum capacitance, causing the capacitance signal waveform to enter a plateau.
[0050] When the sensor is in the state of penetrating the target, the penetration overload of tens of thousands of g disappears instantly, and the inertial force on the mass block 3 quickly decreases from tens of thousands of g to the spring resistance value. Under the action of spring 9, the mass block 3 is in the return state. At this time, the charge output of the sensor piezoelectric piece quickly decreases to zero, and the sensor capacitance increases from the minimum capacitance. Since the sensor capacitance waveform has an obvious feature of changing from a platform segment to a step segment when the projectile penetrates the target, it can be used as a basis for judging whether the projectile has penetrated the target.
[0051] Since the piezoelectric signal of the sensor has the largest charge change only when it penetrates into the target and enters the inside of the target plate, the piezoelectric part of the sensor is only sensitive to the layer penetration signal, which is beneficial to layer identification; the capacitance signal of the sensor is always in the platform section when the projectile penetrates into the inside of the target plate, and when penetrating into and out of the target, the capacitance signal of the sensor has a step-like rising section and falling section, so it is sensitive to the target entry and exit signals, which is beneficial to hole identification. To a certain extent, it solves the problem of traditional acceleration sensors' aliasing of layer penetration signals and unclear target exit signals.
[0052] The above specific embodiments merely illustrate the design principles of the present invention. The shapes and names of the components described herein may vary and are not limiting. Therefore, those skilled in the art may modify or substitute equivalents for the technical solutions described in the above embodiments. Such modifications and substitutions, without departing from the inventive spirit and technical solutions of the present invention, shall fall within the scope of protection of the present invention.
Claims
1. A capacitance and piezoelectric composite sensor for penetration fuze, characterized in that: include: a housing (10); A moving channel is arranged in the housing; one end of the moving channel is connected to the fixed electrode plate (2), and the other end is connected to the piezoelectric sensor assembly; the piezoelectric sensor assembly is insulated from the housing, and a piezoelectric signal lead is led out; an upper electrode (17) is arranged in the middle of the lower surface of the fixed electrode plate (2), and an annular electrode (18) is arranged around it; the upper electrode (17) and the annular electrode (18) are electrically connected to the fixed and moving electrode plate leads respectively; A conductive mass block (3) moves in the moving channel under the action of inertial force; in an initial state, the upper surface of the mass block (3) contacts the fixed electrode plate (2) through a pre-compressed, conductive elastic component (9); the upper surface of the mass block (3) does not contact the annular electrode (18); a layer of insulating dielectric film (16) is provided on the lower surface of the fixed electrode plate (2) to achieve insulation between the upper electrode (17) and the upper surface of the mass block (3) and provide initial capacitance; the mass block (3) is in close contact with the outer shell (10), and the outer shell (10) is in close contact with the annular electrode (18) on the lower surface of the fixed electrode plate (2), forming a moving electrode plate circuit; When the sensor is in the penetration state, the mass block (3) compresses the elastic component (9) under the action of inertial force to break away from the contact with the fixed electrode (2) and moves toward the piezoelectric sensor component, so that the capacitance of the parallel plate capacitor changes; when the mass block continues to move until it contacts the piezoelectric sensor component, the piezoelectric sensor component generates a piezoelectric effect; The piezoelectric sensor component outputs a piezoelectric signal according to the pressure applied by the mass block (3).
2. The capacitance and piezoelectric composite sensor for penetration fuze as claimed in claim 1, characterized in that: The moving channel provides a movement space for the mass block and a storage space for the elastic component; the moving channel includes a first section and a second section, the inner diameter of the first section is larger, and the inner diameter of the second section is smaller; the mass block includes a large end and a small end; the large end cooperates with the first section, and the small end cooperates with the second section, so that the mass block (4) moves along the moving channel; one end of the two ends of the elastic component contacts the bottom surface of the large end, and the other end contacts the upper step surface formed between the first section and the second section.
3. The capacitance and piezoelectric composite sensor for penetration fuze as claimed in claim 1, characterized in that: The piezoelectric sensor assembly comprises a buffer pad (11), a conductive sheet (6), an upper pad (5-1), a piezoelectric sheet (4), a lower pad (5-2), a conductive seat (7), and a rear pad (14) stacked in sequence from top to bottom; the conductive sheet (6) and the conductive seat (7) each lead out a lead wire for a piezoelectric signal; the piezoelectric sheet (4) is in close contact with the conductive sheet (6) and the conductive seat (7) on its upper and lower surfaces; the annular upper pad (5-1) and the lower pad (5-2) provide vibration damping for the piezoelectric sheet (4); the conductive seat (7) is insulated from the housing, and the buffer pad (11) realizes insulation between the mass block (3) and the conductive sheet (6).
4. The capacitance and piezoelectric composite sensor for penetration fuze as claimed in claim 3, characterized in that: The various layers in the piezoelectric sensor assembly are assembled together through a non-conductive outer sleeve (12) and an inner sleeve (13) to achieve insulation from the outer shell; the inner sleeve (13) is used to fix the conductive seat (7), and the outer sleeve (12) is used to fix the buffer pad (11), the conductive sheet (6), the upper gasket (5-1), the piezoelectric sheet (4), the lower gasket (5-2), and the inner sleeve (13).
5. The capacitance and piezoelectric composite sensor for penetration fuze as claimed in claim 1, characterized in that: The upper gasket (5-1) and the lower gasket (5-2) are made of rubber material.
6. The capacitance and piezoelectric composite sensor for penetration fuze as claimed in claim 1, characterized in that: The housing (10) is a cylindrical structure, and grooves are respectively provided on the top and bottom surfaces for mounting the fixed electrode plate (2) and the piezoelectric sensor assembly; an axial wiring groove is provided on the outer surface of the cylindrical structure for leading the lead wires of the piezoelectric sensor assembly out of the sensor.
7. The capacitance and piezoelectric composite sensor for penetration fuze according to any one of claims 1 to 6, characterized in that: The invention further comprises a partition (8) and an upper pressure screw (1); the upper pressure screw (1) and the lower pressure screw (15) are respectively installed at two ends of the housing (10); the upper pressure screw (1) applies pressure to the partition (8) so that the partition (8) is in close contact with the fixed electrode plate (2); the partition (8) insulates and separates the upper pressure screw (1) from the fixed electrode plate (2); and the upper pressure screw (1) and the partition (8) are provided with lead wire outlets.
8. The capacitance and piezoelectric composite sensor for penetration fuze as claimed in claim 4, characterized in that: It further comprises a pressing screw (15), wherein the pressing screw (15) enables the conductive seat (7) to be tightly embedded in the inner sleeve (13); the conductive seat (7) and the pressing screw (15) are insulated by a rear gasket (14).
9. The capacitance and piezoelectric composite sensor for penetration fuze as claimed in claim 1, characterized in that: The elastic component is a spring.
Citation Information
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Impact-type piezoelectric acceleration transducer
CN102798460A
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