CN106447017B - Bullet counting device and method based on acceleration measurement - Google Patents
Bullet counting device and method based on acceleration measurement Download PDFInfo
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- CN106447017B CN106447017B CN201610830206.6A CN201610830206A CN106447017B CN 106447017 B CN106447017 B CN 106447017B CN 201610830206 A CN201610830206 A CN 201610830206A CN 106447017 B CN106447017 B CN 106447017B
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- G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
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- G06M1/27—Design features of general application for representing the result of count in the form of electric signals, e.g. by sensing markings on the counter drum
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Abstract
The invention provides a bullet counting device and a bullet counting method based on acceleration measurement. The bullet counting device based on acceleration measurement comprises a gun barrel sleeve and an acceleration measurement counting device arranged below the gun barrel sleeve, wherein the core component of the acceleration measurement counting device is an acceleration measurement counting and displaying circuit, and the acceleration measurement counting and displaying circuit comprises three acceleration sensors, an adding circuit, two comparison circuits, two conditioning circuits, a logic AND judgment circuit, a counting circuit, a decoding and displaying circuit and a power supply circuit. The invention simultaneously measures the accelerations parallel to the axis direction of the gun barrel (X-axis direction) and perpendicular to the axis direction of the gun barrel (Y-axis and Z-axis planes) respectively through three acceleration sensors and carries out logic AND judgment, the device can effectively inhibit the interference vibration caused by the colliding actions of operating the gun and the like in the training process, and effectively ensure the accuracy of counting.
Description
Technical Field
The invention relates to a bullet counter, in particular to a bullet counting device and a bullet counting method based on acceleration measurement.
Background
In troops and police systems, the loss of bullets is a very serious accident. The control of the number of bullets in shooting practice is very strict and requires that the number of distributions and the number of firings be completely identical. With the increase of training subjects, soldiers are concentrated in the training subjects in the shooting process, the number of shot bullets is not concerned, and fire accidents are easy to happen in the gun test after shooting. Some soldiers break the rules of secrecy of ammunition, so that the number of fired bullets is less than the number of distributed bullets, and an accident of bullet management runaway occurs. The existing bullet counting modes comprise acoustic wave detection counting, infrared detection counting, vibration frequency detection counting and the like, and the counting modes have different complexity and accurate counting effects.
Disclosure of Invention
One of the purposes of the invention is to provide a bullet counting device based on acceleration measurement, which can be used for counting the firing of bullet of guns such as submachine guns, sniper rifles, semi-automatic rifles, pistols and the like, and has the advantages of accurate counting, good universality, simple and convenient installation, high integration level, good reliability and the like.
The second objective of the present invention is to provide a bullet counting method based on acceleration measurement, which can effectively suppress the interference vibration and improve the counting accuracy.
One of the objects of the invention is achieved by: a bullet counting device based on acceleration measurement comprises a barrel sleeve sleeved on a barrel and an acceleration measurement counting device fixedly arranged below the barrel sleeve; the acceleration measurement counting device comprises a shell, an acceleration measurement counting and display circuit and a built-in power supply, wherein the acceleration measurement counting and display circuit and the built-in power supply are arranged in the shell;
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A first acceleration sensor connected to the first comparison circuit, the first acceleration sensor being parallel to the barrel axis, the recoil acceleration sensor is used for measuring the recoil acceleration of the axis direction of the gun barrel and outputting a corresponding voltage signal;
the second acceleration sensor is connected with the addition circuit, is perpendicular to the axis direction of the gun barrel, and is used for measuring the vibration acceleration perpendicular to the axis direction of the gun barrel and outputting a corresponding voltage signal;
the third acceleration sensor is connected with the addition circuit, is perpendicular to the axis direction of the gun barrel, is perpendicular to the second acceleration sensor, is also used for measuring the vibration acceleration perpendicular to the axis direction of the gun barrel and outputs a corresponding voltage signal;
the addition circuit is respectively connected with the second acceleration sensor, the third acceleration sensor and the second comparison circuit and is used for summing the voltage output by the second acceleration sensor and the voltage output by the third acceleration sensor;
the first comparison circuit is respectively connected with the first acceleration sensor and the first conditioning circuit and is used for comparing the voltage output by the first acceleration sensor with a preset counting lower limit threshold voltage, if the voltage output by the first acceleration sensor is lower than the preset counting lower limit threshold voltage, the first comparison circuit outputs a low level signal, otherwise, the first comparison circuit outputs a high level signal;
the second comparison circuit is respectively connected with the addition circuit and the second conditioning circuit and used for comparing the voltage output by the addition circuit with a preset interference upper limit threshold voltage, if the voltage output by the addition circuit is lower than the preset interference upper limit threshold voltage, the second comparison circuit outputs a high level signal, otherwise, the second comparison circuit outputs a low level signal;
the first conditioning circuit is respectively connected with the first comparison circuit and the logic AND judgment circuit and is used for conditioning the level signal output by the first comparison circuit, if a plurality of square wave pulse signals exist in a preset time period, the level signal is conditioned into a square wave pulse signal, otherwise, the original level signal is maintained unchanged;
the second conditioning circuit is respectively connected with the second comparison circuit and the logic AND judgment circuit and is used for conditioning the level signal output by the second comparison circuit, if a plurality of negative square wave pulse signals exist in a preset time period, the level signal is conditioned into a negative square wave pulse signal, and otherwise, the original level signal is maintained unchanged;
the logic AND judgment circuit is respectively connected with the first conditioning circuit, the second conditioning circuit and the counting circuit and is used for carrying out logic AND operation on the level signal output by the first conditioning circuit and the level signal output by the second conditioning circuit;
the counting circuit is respectively connected with the logic AND judging circuit and the decoding and displaying circuit and is used for counting according to the output result of the logic AND judging circuit, when the logic AND judging circuit outputs a positive pulse square wave signal, the output counting result of the counting circuit is increased by one, otherwise, the output counting result of the counting circuit is kept unchanged;
the decoding and displaying circuit is connected with the counting circuit and is used for decoding and displaying the output counting result of the counting circuit; and
and the power supply circuit is electrically connected with the built-in power supply and is used for supplying power to each circuit and three sensors in the acceleration measurement counting and display circuit.
The gun barrel sleeve comprises two semicircular pipe hoops, and notches of the two pipe hoops are arranged oppositely; one side of the two pipe hoops is connected through a hinge, the other side of the two pipe hoops is connected through a locking buckle, and the gun barrel is located in a cavity surrounded by the two pipe hoops.
The inner side walls of the two pipe hoops are provided with heat-insulating anti-skid layers; the heat-insulating anti-slip layer is made of asbestos material.
When the level signal output by the first conditioning circuit comprises a positive square wave pulse signal and the level signal output by the second conditioning circuit comprises a negative square wave pulse signal, the pulse width of the negative square wave pulse signal output by the second conditioning circuit is larger than and comprises the pulse width of the positive square wave pulse signal output by the first conditioning circuit.
The shell is provided with a power switch, a reset button, a display window and a power charging interface.
The bullet counting device based on acceleration measurement comprises a gun barrel sleeve and an acceleration measurement counting device arranged below the gun barrel sleeve, wherein the gun barrel sleeve is used for being reliably connected with a gun barrel, and the acceleration measurement counting device comprises a shell, a built-in power supply, an acceleration measurement counting and displaying circuit, a power switch, a reset button, a display window and the like which are arranged on the shell. In the acceleration measurement counting and display circuit, three acceleration sensors are used for measuring three axial accelerations, one of the acceleration sensors is a sensor parallel to the axis direction of the gun barrel and is used for measuring the recoil acceleration along the axis direction (set as the X-axis direction) of the gun barrel when a bullet is fired and is used as a counting signal for firing the bullet, and the other two acceleration sensors are sensors perpendicular to the axis direction of the gun barrel and are used for measuring two vibration accelerations which are perpendicular to each other and are all perpendicular to the axis direction (set as the Y axis and the Z axis) of the gun barrel and are used as judgment signals for interfering vibration and are used for effectively inhibiting the interfering vibration and improving the accuracy of counting.
The three sensors, the addition circuit, the comparison circuit, the conditioning circuit, the logic AND judgment circuit, the counting circuit, the decoding and display circuit and the power circuit are arranged on the same circuit board to jointly form the acceleration measuring counting and display circuit, and the acceleration measuring counting and display circuit has the characteristics of high integration level and good reliability; the acceleration measurement counting and display circuit and the built-in power supply are arranged in the shell, a power switch, a reset button, a display window and a power charging interface are arranged on the shell, and a shooter and a bullet recorder can observe counting results in real time through the display window on the shell.
The bullet counting device based on acceleration measurement can be simply and conveniently arranged on the gun barrel, can accurately record the number of the shot bullets, and is suitable for bullet safety management during shooting training of troops and public security systems.
The second purpose of the invention is realized by the following steps: a bullet counting method based on acceleration measurement comprises the following steps:
a. fixing an acceleration measuring and counting device on a gun barrel through a gun barrel sleeve; the acceleration measurement counting device comprises a shell, an acceleration measurement counting and display circuit and a built-in power supply which are arranged in the shell, a power switch, a reset button and a display window which are arranged on the shell; the acceleration measurement counting and displaying circuit comprises a first acceleration sensor, a second acceleration sensor, a third acceleration sensor, an adding circuit, a first comparison circuit, a second comparison circuit, a first conditioning circuit, a second conditioning circuit, a logic AND judgment circuit, a counting circuit, a decoding and displaying circuit and a power supply circuit;
b. turning on a power switch of the acceleration measurement counting device, and pressing a reset button to display '00' in a display window;
c. measuring recoil acceleration in the axis direction of the gun barrel by a first acceleration sensor and outputting a corresponding voltage signal to a first comparison circuit; the second acceleration sensor and the third acceleration sensor respectively measure the vibration acceleration in the direction vertical to the axis of the gun barrel and output corresponding voltage signals to the addition circuit; the vibration directions of the vibration acceleration measured by the second acceleration sensor and the third acceleration sensor are mutually vertical;
d. the addition circuit sums the voltage output by the second acceleration sensor and the voltage output by the third acceleration sensor and outputs the summed voltage signal to the second comparison circuit;
e. the first comparison circuit compares the voltage output by the first acceleration sensor with a preset counting lower limit threshold voltage and outputs a signal to the first conditioning circuit, if the voltage output by the first acceleration sensor is lower than the preset counting lower limit threshold voltage, the first comparison circuit outputs a low level signal, otherwise, the first comparison circuit outputs a high level signal;
the second comparison circuit compares the voltage output by the addition circuit with a preset interference upper limit threshold voltage and outputs a signal to the second conditioning circuit, if the voltage output by the addition circuit is lower than the preset interference upper limit threshold voltage, the second comparison circuit outputs a high level signal, otherwise, the second comparison circuit outputs a low level signal;
f. the first conditioning circuit conditions the signal output by the first comparison circuit and outputs a level signal to the logic AND judgment circuit; if a plurality of square wave pulse signals exist in the signal output by the first comparison circuit within a preset time period, the signal is conditioned into a square wave pulse signal, otherwise, the original level signal is maintained unchanged;
the second conditioning circuit conditions the signal output by the second comparison circuit and outputs a level signal to the logic AND judgment circuit; if a plurality of negative square wave pulse signals exist in the signal output by the second comparison circuit within a preset time period, the signal is conditioned into a negative square wave pulse signal, otherwise, the original level signal is maintained unchanged;
when the level signal output by the first conditioning circuit comprises a positive square wave pulse signal and the level signal output by the second conditioning circuit comprises a negative square wave pulse signal, the pulse width of the negative square wave pulse signal output by the second conditioning circuit is larger than and comprises the pulse width of the positive square wave pulse signal output by the first conditioning circuit.
g. The logic AND judgment circuit performs logic AND operation on the level signal output by the first conditioning circuit and the level signal output by the second conditioning circuit and outputs a level signal to the counting circuit;
h. the counting circuit counts according to the output result of the logic AND judgment circuit and outputs the counting result to the decoding and display circuit; when the logic AND judgment circuit outputs a positive pulse square wave signal, the output counting result of the counting circuit is increased by one, otherwise, the output counting result of the counting circuit is kept unchanged;
i. the decoding and displaying circuit decodes and displays the output counting result of the counting circuit.
In the step a, the barrel sleeve comprises two semicircular pipe hoops, and notches of the two pipe hoops are oppositely arranged; one side of the two pipe hoops is connected through a hinge, the other side of the two pipe hoops is connected through a locking buckle, and the gun barrel is located in a cavity surrounded by the two pipe hoops.
The inner side walls of the two pipe hoops are provided with heat-insulating anti-skid layers; the heat-insulating anti-slip layer is made of asbestos materials.
In the method, three acceleration sensors are used for respectively measuring three acceleration components parallel to the axis direction (X-axis direction) of a gun barrel and two acceleration components perpendicular to the axis direction (Y-axis direction and Z-axis direction) of the gun barrel, the acceleration parallel to the axis direction (X-axis direction) of the gun barrel is recoil acceleration in the axis direction of the gun barrel when a bullet is fired and is used as a counting signal for judging firing of the bullet, the two acceleration components perpendicular to the axis direction (Y-axis direction and Z-axis direction) of the gun barrel are vibration acceleration perpendicular to the axis direction of the gun barrel, and the acceleration in the Y-axis direction and the acceleration in the Z-axis direction are summed and are used as a judgment signal for vibration interference. According to the characteristic that the recoil acceleration parallel to the axis direction of the gun barrel is far larger than the vibration acceleration perpendicular to the axis direction of the gun barrel when a bullet is fired, the counting lower limit threshold voltage parallel to the axis direction of the gun barrel (the X-axis direction) and the interference upper limit threshold voltage perpendicular to the axis direction of the gun barrel (the plane formed by the Y-axis and the Z-axis) are respectively preset. When the recoil acceleration parallel to the axis direction (X-axis direction) of the gun barrel is higher than the preset lower limit threshold voltage of counting, and the vibration acceleration perpendicular to the axis of the gun barrel is lower than the preset upper limit threshold voltage of interference, the gun barrel vibration is judged to be bullet firing, and the counting is increased once. The method can effectively inhibit the interference vibration caused by the colliding actions such as operating the gun and the like in the training process by simultaneously measuring the accelerations in the directions parallel to and perpendicular to the axis of the gun barrel and carrying out logical AND judgment, thereby effectively ensuring the accuracy of the counter.
The invention can preset different counting lower limit threshold voltage and interference upper limit threshold voltage according to different gun types, and has good general performance.
Drawings
Fig. 1 is a schematic diagram of the structure of the bullet counting device based on acceleration measurement in the invention.
FIG. 2 is the view of FIG. 1 side view of (a).
FIG. 3 is a block diagram of an acceleration measurement counting and display circuit according to the present invention.
In the figure: 11. the device comprises an upper pipe clamp, 12, a lower pipe clamp, 13, a hinge, 14, a locking buckle, 15, a heat-insulating anti-slip layer, 21, a shell, 22, a power switch, 23, a reset button, 24, a display window, 25, an acceleration measuring counting and displaying circuit, 26, a built-in power supply, 27, a power supply charging interface, 31, a first acceleration sensor, 32, a second acceleration sensor, 33, a third acceleration sensor, 34, an adding circuit, 35, a first comparing circuit, 36, a second comparing circuit, 37, a first conditioning circuit, 38, a second conditioning circuit, 39, a logic AND judging circuit, 40, a counting circuit, 41, a decoding and displaying circuit.
Detailed Description
The bullet counting device based on acceleration measurement comprises a barrel sleeve sleeved on a barrel and an acceleration measurement counting device arranged below the barrel sleeve. The gun barrel sleeve is used for being reliably fixed with the gun barrel, and the acceleration measuring and counting device is fixedly connected with the gun barrel sleeve.
As shown in fig. 1 and 2, the barrel sleeve includes two semicircular pipe collars, an upper pipe collar half 11 and a lower pipe collar half 12, the notches of the two pipe collars are opposite to each other, one side of the two pipe hoops is connected through a hinge 13 and can rotate, and the other side of the two pipe hoops is provided with a locking buckle 14 which can be used for connecting the two pipe hoops in a fastening way. When the device is used for counting, a gun barrel is placed in the center of the lower half pipe hoop 12, the upper half pipe hoop 11 is closed, and the barrel sleeve is locked through the locking buckle 14, so that reliable connection is ensured. And heat-insulating anti-skid layers 15 are arranged on the inner side walls of the two pipe hoops, and the heat-insulating anti-skid layers 15 are made of asbestos materials.
The acceleration measurement counting device below the barrel sleeve comprises a shell 21, an acceleration measurement counting and display circuit 25 and a built-in power supply 26 are fixedly arranged in the shell 21, a power switch 22, a reset button 23, a display window 24 and a power charging interface 27 are fixedly arranged on the shell 21, and the built-in power supply 26 in the shell 21 can be charged through the power charging interface 27.
The core component of the acceleration measurement counting device is an acceleration measurement counting and display circuit 25, the acceleration measurement counting and display circuit 25 is a circuit board which is fixed inside the shell 21, and the circuit board and the gun barrel are kept relatively static when the counting device works, so that the acceleration is effectively measured.
As shown in figure 3 of the drawings, the acceleration measurement count and display circuit includes: the acceleration sensor comprises a first acceleration sensor 31, a second acceleration sensor 32, a third acceleration sensor 33, an adding circuit 34, a first comparison circuit 35, a second comparison circuit 36, a first conditioning circuit 37, a second conditioning circuit 38, a logic AND judgment circuit 39, a counting circuit 40, a decoding and display circuit 41 and a power supply circuit. The power supply circuit is not shown in fig. 3, and is electrically connected to the built-in power supply, and the voltage supplied from the built-in power supply is supplied to each circuit and three sensors in the acceleration measurement counting and display circuit by the conversion of the power supply circuit.
The first acceleration sensor 31 is connected to a first comparison circuit 35, and the first acceleration sensor 31 is parallel to the barrel axis direction and is used for measuring the recoil acceleration in the barrel axis direction and outputting a corresponding voltage signal to the first comparison circuit 35. The second acceleration sensor 32 and the third acceleration sensor 33 are connected to an adder circuit 34, the second acceleration sensor 32 and the third acceleration sensor 33 are perpendicular to the barrel axis direction and perpendicular to each other, and the second acceleration sensor 32 and the third acceleration sensor 33 are respectively used for measuring the vibration acceleration perpendicular to the barrel axis direction and outputting corresponding voltage signals to the adder circuit 34.
In the embodiment, the three acceleration sensors all adopt ADXL193 acceleration measurement integrated chips, the first acceleration sensor 31 is used for measuring recoil acceleration in the axis direction of a gun barrel when a bullet is fired, and the direction is set as the X-axis direction; the second acceleration sensor 32 and the third acceleration sensor 33 each measure acceleration in a direction perpendicular to the barrel axis, the direction of the acceleration measured by the second acceleration sensor 32 is set to the Y-axis direction, and the direction of the acceleration measured by the third acceleration sensor 33 is set to the Z-axis direction. The three ADXL193 acceleration measurement integrated chips can be fixed on the circuit board in a welding mode according to three different directions of an X axis, a Y axis and a Z axis, and the system integration level and reliability are improved. The series of acceleration measurement integrated chips with different measuring ranges can also be used to replace ADXL193.
The adding circuit 34 is connected to the second acceleration sensor 32, the third acceleration sensor 33, and the second comparing circuit 36, and is configured to sum the voltage output from the second acceleration sensor 32 and the voltage output from the third acceleration sensor 33 and output the sum to the second comparing circuit 36. The adder circuit 34 is composed of an LM107 and a peripheral resistor, and the output voltage is the sum of the voltages of two input accelerations of a Y axis and a Z axis perpendicular to the direction of the gun barrel.
The first comparing circuit 35 is connected to the first acceleration sensor 31 and the first conditioning circuit 37, and is configured to compare the voltage output by the first acceleration sensor 31 with a preset lower limit count threshold voltage and output a level signal to the first conditioning circuit 37, if the voltage output by the first acceleration sensor 31 is lower than the preset lower limit count threshold voltage, the first comparing circuit 35 outputs a low level signal, and if the voltage output by the first acceleration sensor 31 is not lower than the preset lower limit count threshold voltage, the first comparing circuit 35 outputs a high level signal.
The second comparing circuit 36 is connected to the adding circuit 34 and the second conditioning circuit 38, and is configured to compare the voltage output by the adding circuit 34 with a preset interference upper threshold voltage and output a level signal to the second conditioning circuit 38, where if the voltage output by the adding circuit 34 is lower than the preset interference upper threshold voltage, the second comparing circuit 36 outputs a high level signal, and if the voltage output by the adding circuit 34 is not lower than the preset interference upper threshold voltage, the second comparing circuit 36 outputs a low level signal.
In the present embodiment, the first comparator circuit 35 and the second comparator circuit 36 both use the high-speed comparator LM311. In other embodiments, a different type of voltage comparator integrated chip may be used instead of LM311.
The first conditioning circuit 37 is connected to the first comparing circuit 35 and the and logic determining circuit 39, and is configured to condition the level signal output by the first comparing circuit and output the level signal to the and logic determining circuit 39. The specific conditioning process is as follows: if a plurality of square wave pulse signals exist in the level signal output by the first comparison circuit within a certain preset time period, the level signal is conditioned into a square wave pulse signal, otherwise, the original level signal is maintained unchanged.
The second conditioning circuit 38 is connected to the second comparing circuit 36 and the and logic determining circuit 39, and is configured to condition the level signal output by the second comparing circuit and output the level signal to the and logic determining circuit 39. The specific conditioning process is as follows: if a plurality of negative square wave pulse signals exist in the level signal output by the second comparison circuit within a certain preset time period, conditioning the level signal into a negative square wave pulse signal; otherwise, the original level signal is maintained unchanged.
If a positive square wave pulse signal exists in the level signal conditioned by the first conditioning circuit 37 within a preset time period, and a negative square wave pulse signal exists in the level signal conditioned by the second conditioning circuit 38 within the preset time period; the pulse width of the negative square wave pulse signal output by the second conditioning circuit 38 is set to be greater than and include the pulse width of the positive square wave pulse signal output by the first conditioning circuit 37.
When a bullet is fired, the voltage signal output by the acceleration sensor is jittered and noisy, which causes the first comparator circuit 35 and the second comparator circuit 36 to output a plurality of pulse signals in a short time range (e.g., 10 ms). The first conditioning circuit 37 and the second conditioning circuit 38 are used for conditioning and shaping a plurality of pulses appearing in a short time range into a standard square wave with a fixed pulse width for output, so that a plurality of counting pulse signals are prevented from being output by one bullet. The first conditioning circuit 37 and the second conditioning circuit 38 are mainly composed of an NE555 integrated chip and peripheral devices such as a capacitor and a resistor.
The logical and decision circuit 39 is connected to the first conditioning circuit 37, the second conditioning circuit 38 and the counting circuit 40, which is used to perform a logical and operation on the level signal output by the first conditioning circuit 37 and the level signal output by the second conditioning circuit 38 and output the level signal to the counting circuit 40. The logic and judgment circuit 39 is replaced by a 7408 and gate integrated chip or an and gate integrated chip of other types.
The counter circuit 40 is connected to the and logic determination circuit 39 and the decode and display circuit 41, and counts the number of times based on the output result of the and logic determination circuit 39, and outputs the counted number to the decode and display circuit 41. When the logical and judgment circuit 39 outputs a positive pulse square wave signal, the output counting result of the counting circuit 40 is increased by one; when the logical and judgment circuit 39 outputs a low level signal, the output count result of the count circuit 40 remains unchanged on the original basis. In the embodiment, the counting circuit 40 adopts a decimal counter SN74LS390 to form a two-bit decimal count, and the counting range is 0 to 99. In other embodiments, other counter integrated chips may be used instead of SN74LS390.
The decoding and display circuit 41 is connected to the counter circuit 40, and decodes and displays the output count result of the counter circuit 40. In the present embodiment, two decoding and display circuits 7 are used for the decoding and display circuit 41 the segment nixie tube displays the counting result of the counting circuit 40. The output pin of the decimal counter is connected with the input pin of a nixie tube decoder SN74LS47, the output pin of the decoder is connected with 7 sections of nixie tubes, and the nixie tubes display the number value of bullet emission accumulation counting. In other embodiments, other types of nixie tube decoding driving integrated chips can be adopted to replace the SN74LS47.
The working process of the invention is as follows:
(1) The acceleration measuring and counting device is reliably fixed on the gun barrel through the gun barrel sleeve, so that the relative position of the acceleration measuring and counting device and the gun barrel is unchanged when a bullet is shot and counted, and the acceleration measurement is reliable and effective.
(2) And opening a power switch on the acceleration measurement counting device, pressing a reset button to clear data, and viewing the acceleration measurement counting and nixie tube display '00' on the display circuit from the display window.
(3) The acceleration measurement counting and displaying circuit has the following three working states:
(1) a static state: acceleration sensors in the X-axis direction, the Y-axis direction and the Z-axis direction have no vibration induction and no pulse electric signal output. The output voltage parallel to the axis direction (X-axis direction) of the gun barrel is lower than the preset lower limit threshold voltage of counting, the first comparison circuit 35 keeps the output of low level "0" unchanged, and the output of low level "0" is unchanged after passing through the first conditioning circuit 37; the two acceleration sensors perpendicular to the axis direction of the gun barrel (the direction of the Y axis and the direction of the Z axis) have no output, the voltage output after passing through the adding circuit 34 is lower than the preset interference upper limit threshold voltage, the output of the high level '1' is kept unchanged by the second comparing circuit 36, and the output of the high level '1' is unchanged by the second conditioning circuit 38. After passing through the and logic determination circuit 39, the output of the low level "0" is kept unchanged, the count result value output by the count circuit 40 is kept unchanged, and the display value of the decode and display circuit 41 is kept unchanged.
(2) Bullet firing counting state: the bullet is fired once to generate strong recoil acceleration, the output voltage parallel to the axis direction (X-axis direction) of the gun barrel is higher than the preset counting lower limit threshold voltage, the first comparison circuit 35 outputs positive pulse, and a standard square wave pulse signal is formed after the positive pulse passes through the first conditioning circuit 37; meanwhile, two acceleration sensors perpendicular to the axis direction of the gun barrel (the direction of the Y axis and the direction of the Z axis) can also respectively output weaker pulse signals, the voltage output after passing through the adding circuit 34 is still lower than the preset interference upper limit threshold voltage, the output of the high level 1 is kept unchanged by the second comparing circuit 36, and the output of the high level 1 is unchanged by the second conditioning circuit 38. After passing through the logical and judgment circuit 39, a positive pulse square wave signal is output, the counting result output by the counting circuit 40 is increased by 1, and the display value of the decoding and display circuit 41 is increased by 1.
(3) Disturbance vibration suppression state: in the training process, due to the collision actions of a gun and the like, vibration can be caused, and the acceleration sensors in the three directions all output voltage pulse signals. Two acceleration sensors perpendicular to the axis direction of the gun barrel (Y-axis direction and Z-axis direction) respectively output pulse signals, the pulse signals are output through an addition circuit 34 and then output the sum of voltages, when the sum of the voltages is higher than a preset interference upper limit threshold voltage, the vibration perpendicular to the axis direction of the gun barrel exceeds a threshold value, and the vibration is judged to be interference vibration and not vibration generated by bullet firing. At this time, the second comparing circuit 36 outputs a negative pulse signal, which passes through the second conditioning circuit 38 to form a negative pulse signal of a standard square wave. In the time period of "0" of the low level of the standard square wave negative pulse signal outputted by the second conditioning circuit 38, a plurality of disturbance vibrations output a positive pulse signal when the acceleration voltage component parallel to the barrel axis direction (X axis direction) exceeds the preset counting lower limit threshold voltage, and the pulse width of the output positive pulse signal is smaller than and included in the pulse width of the negative pulse signal outputted by the second conditioning circuit 38, so that no pulse is still outputted after passing through the logical and judgment circuit 39, the counting result value outputted by the counting circuit 40 remains unchanged, and the decoding and display circuit 41 displays the value unchanged. During the low level "0" period of the standard square wave undershoot signal output by the second conditioning circuit 38, the acceleration voltage component of a plurality of disturbing vibrations in the direction parallel to the barrel axis (X-axis direction) is lower than the preset lower counting threshold voltage, the output low level signal is still output after passing through the logical and judgment circuit 39, the counting result value output by the counting circuit 40 is kept unchanged, and the display value of the decoding and display circuit 41 is unchanged. From the above analysis, the invention can effectively suppress the interference vibration and ensure the counting accuracy.
Claims (7)
1. A bullet counting device based on acceleration measurement is characterized by comprising a barrel sleeve sleeved on a barrel and an acceleration measurement counting device fixedly arranged below the barrel sleeve; the acceleration measurement counting device comprises a shell, an acceleration measurement counting and display circuit and a built-in power supply, wherein the acceleration measurement counting and display circuit and the built-in power supply are arranged in the shell;
the acceleration measurement counting and display circuit comprises:
the first acceleration sensor is connected with the first comparison circuit, is parallel to the axis direction of the gun barrel, and is used for measuring the recoil acceleration of the axis direction of the gun barrel and outputting a corresponding voltage signal;
the second acceleration sensor is connected with the addition circuit, is perpendicular to the axis direction of the gun barrel, and is used for measuring the vibration acceleration perpendicular to the axis direction of the gun barrel and outputting a corresponding voltage signal;
the third acceleration sensor is connected with the addition circuit, is perpendicular to the axis direction of the gun barrel, is perpendicular to the second acceleration sensor, is also used for measuring the vibration acceleration perpendicular to the axis direction of the gun barrel and outputs a corresponding voltage signal;
the addition circuit is respectively connected with the second acceleration sensor, the third acceleration sensor and the second comparison circuit and is used for summing the voltage output by the second acceleration sensor and the voltage output by the third acceleration sensor;
the first comparison circuit is respectively connected with the first acceleration sensor and the first conditioning circuit and is used for comparing the voltage output by the first acceleration sensor with a preset counting lower limit threshold voltage, if the voltage output by the first acceleration sensor is lower than the preset counting lower limit threshold voltage, the first comparison circuit outputs a low level signal, otherwise, the first comparison circuit outputs a high level signal;
the second comparison circuit is respectively connected with the addition circuit and the second conditioning circuit and used for comparing the voltage output by the addition circuit with a preset interference upper limit threshold voltage, if the voltage output by the addition circuit is lower than the preset interference upper limit threshold voltage, the second comparison circuit outputs a high level signal, otherwise, the second comparison circuit outputs a low level signal;
the first conditioning circuit is respectively connected with the first comparison circuit and the logic AND judgment circuit and is used for conditioning the level signal output by the first comparison circuit, if a plurality of square wave pulse signals exist in a preset time period, the level signal is conditioned into a square wave pulse signal, otherwise, the original level signal is maintained unchanged;
the second conditioning circuit is respectively connected with the second comparison circuit and the logic AND judgment circuit and is used for conditioning the level signal output by the second comparison circuit, if a plurality of negative square wave pulse signals exist in a preset time period, the level signal is conditioned into a negative square wave pulse signal, otherwise, the original level signal is maintained unchanged;
the logic AND judgment circuit is respectively connected with the first conditioning circuit, the second conditioning circuit and the counting circuit and is used for carrying out logic AND operation on the level signal output by the first conditioning circuit and the level signal output by the second conditioning circuit;
the counting circuit is respectively connected with the logic AND judging circuit and the decoding and displaying circuit and is used for counting according to the output result of the logic AND judging circuit, when the logic AND judging circuit outputs a positive pulse square wave signal, the output counting result of the counting circuit is increased by one, otherwise, the output counting result of the counting circuit is kept unchanged;
the decoding and displaying circuit is connected with the counting circuit and is used for decoding and displaying the output counting result of the counting circuit; and
the power supply circuit is electrically connected with the built-in power supply and is used for supplying power to each circuit and three sensors in the acceleration measurement counting and display circuit;
when the level signal output by the first conditioning circuit comprises a positive square wave pulse signal and the level signal output by the second conditioning circuit comprises a negative square wave pulse signal, the pulse width of the negative square wave pulse signal output by the second conditioning circuit is greater than and comprises the pulse width of the positive square wave pulse signal output by the first conditioning circuit;
the shell is provided with a power switch, a reset button, a display window and a power charging interface.
2. The acceleration measurement-based bullet counting device according to claim 1, wherein the barrel sleeve comprises two semicircular bands, the notches of the two bands being disposed opposite to each other; one side of the two pipe hoops is connected through a hinge, the other side of the two pipe hoops is connected through a locking buckle, and the gun barrel is positioned in a cavity surrounded by the two pipe hoops.
3. The acceleration measurement-based bullet counting device according to claim 2, wherein a heat-insulating anti-slip layer is provided on the inner side walls of the two pipe collars; the heat-insulating anti-skid layer is made of asbestos materials.
4. A bullet counting method based on acceleration measurement is characterized by comprising the following steps:
a. fixing an acceleration measuring and counting device on a gun barrel through a gun barrel sleeve; the acceleration measurement counting device comprises a shell, an acceleration measurement counting and display circuit and a built-in power supply which are arranged in the shell, a power switch, a reset button and a display window which are arranged on the shell; the acceleration measurement counting and displaying circuit comprises a first acceleration sensor, a second acceleration sensor, a third acceleration sensor, an adding circuit, a first comparison circuit, a second comparison circuit, a first conditioning circuit, a second conditioning circuit, a logic AND judgment circuit, a counting circuit, a decoding and displaying circuit and a power supply circuit;
b. turning on a power switch of the acceleration measurement counting device, and pressing a reset button to display '00' in the display window;
c. measuring recoil acceleration in the axis direction of the gun barrel by a first acceleration sensor and outputting a corresponding voltage signal to a first comparison circuit; the second acceleration sensor and the third acceleration sensor respectively measure the vibration acceleration in the direction vertical to the axis of the gun barrel and output corresponding voltage signals to the addition circuit; the vibration directions of the vibration acceleration measured by the second acceleration sensor and the third acceleration sensor are mutually vertical;
d. the addition circuit sums the voltage output by the second acceleration sensor and the voltage output by the third acceleration sensor and outputs the summed voltage signal to the second comparison circuit;
e. the first comparison circuit compares the voltage output by the first acceleration sensor with a preset counting lower limit threshold voltage and outputs a signal to the first conditioning circuit, if the voltage output by the first acceleration sensor is lower than the preset counting lower limit threshold voltage, the first comparison circuit outputs a low level signal, otherwise, the first comparison circuit outputs a high level signal;
the second comparison circuit compares the voltage output by the addition circuit with a preset interference upper limit threshold voltage and outputs a signal to the second conditioning circuit, if the voltage output by the addition circuit is lower than the preset interference upper limit threshold voltage, the second comparison circuit outputs a high level signal, otherwise, the second comparison circuit outputs a low level signal;
f. the first conditioning circuit conditions the signal output by the first comparison circuit and outputs a level signal to the logic AND judgment circuit; if a plurality of square wave pulse signals exist in the signal output by the first comparison circuit within a preset time period, the signal is conditioned into a square wave pulse signal, otherwise, the original level signal is maintained unchanged;
the second conditioning circuit conditions the signal output by the second comparison circuit and outputs the signal to the logic AND judgment circuit; if a plurality of negative square wave pulse signals exist in the signal output by the second comparison circuit within a preset time period, the signal is conditioned into a negative square wave pulse signal, otherwise, the original level signal is maintained unchanged;
g. the logic AND judgment circuit performs logic AND operation on the level signal output by the first conditioning circuit and the level signal output by the second conditioning circuit and outputs the level signal to the counting circuit;
h. the counting circuit counts according to the output result of the logic AND judgment circuit and outputs the counting result to the decoding and display circuit; when the logic AND judging circuit outputs a positive pulse square wave signal, the output counting result of the counting circuit is increased by one, otherwise, the output counting result of the counting circuit is kept unchanged;
i. the decoding and displaying circuit decodes and displays the output counting result of the counting circuit.
5. The acceleration measurement-based bullet counting method according to claim 4, wherein in the step a, the barrel sleeve comprises two semicircular pipe hoops, and the notches of the two pipe hoops are oppositely arranged; one side of the two pipe hoops is connected through a hinge, the other side of the two pipe hoops is connected through a locking buckle, and the gun barrel is located in a cavity surrounded by the two pipe hoops.
6. The acceleration measurement-based bullet counting method according to claim 5, wherein a heat-insulating anti-slip layer is provided on the inner side walls of the two pipe hoops; the heat-insulating anti-slip layer is made of asbestos materials.
7. The method according to claim 4, wherein in step f, when the level signal output by the first conditioning circuit comprises a positive square wave pulse signal and the level signal output by the second conditioning circuit comprises a negative square wave pulse signal, the pulse width of the negative square wave pulse signal output by the second conditioning circuit is greater than and includes the pulse width of the positive square wave pulse signal output by the first conditioning circuit.
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| CN111564073B (en) * | 2020-04-13 | 2022-05-03 | 中国人民解放军陆军勤务学院 | Method and system for simulating gun opening of firearms in military simulation |
| CN114941963A (en) * | 2022-04-26 | 2022-08-26 | 武汉长江光电有限公司 | Sighting telescope capable of displaying number of bullets in magazine and using method thereof |
| CN114818836B (en) * | 2022-06-29 | 2022-09-20 | 电科疆泰(深圳)科技发展有限公司 | Shooting counting method and device, electronic equipment and storage medium |
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