CN113776678A - Dual-waveband pyroelectric sensor - Google Patents
Dual-waveband pyroelectric sensor Download PDFInfo
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- CN113776678A CN113776678A CN202110934339.9A CN202110934339A CN113776678A CN 113776678 A CN113776678 A CN 113776678A CN 202110934339 A CN202110934339 A CN 202110934339A CN 113776678 A CN113776678 A CN 113776678A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/34—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using capacitors, e.g. pyroelectric capacitors
Abstract
A dual-band pyroelectric sensor relates to the technical field of fire detection devices and comprises a sensor body, a sensor mounting frame and a protective cover, wherein the sensor body is arranged on the sensor mounting frame, the sensor body is covered by the protective cover, the sensor body comprises an optical lens, a sensor module and a fixed seat, one side, facing the optical lens, of the protective cover is provided with a transparent plate, the sensor mounting frame can do reciprocating motion in the vertical direction relative to the transparent plate, and the fixed seat can do circular rotary motion relative to the sensor mounting frame; the invention can simultaneously realize the adjustment of the height difference, the direction and the angle between the sensor body and the flame and improve the precision degree of the sensor body for detecting the specific position of the flame on the basis of setting the screw rod sliding table sliding structure which is a driving mode.
Description
Technical Field
The invention relates to the technical field of fire detection devices, in particular to a dual-waveband pyroelectric sensor.
Background
A pyroelectric sensor, also called a pyroelectric infrared detector in the field of fire fighting, receives infrared rays with specific wavelengths radiated from moving objects, and converts the infrared rays into low-frequency electric signals related to the moving speed, distance, direction and the like of the objects. The voltage responsivity of the sensor is inversely proportional to the frequency of the incident light radiation change, so that when constant infrared radiation is irradiated on the detector, no electrical signal is output by the detector, and therefore the constant infrared radiation cannot be detected; the faster the object moves, the lower the output voltage will be for the same incident power. The detector will only output a voltage signal when the voltage reaches an alarm threshold level.
At present, a known pyroelectric infrared detector is generally positioned and installed at a certain high place indoors, the pyroelectric infrared detector can rotate and detect a range covered by the rotation of the pyroelectric infrared detector, however, when a fire disaster occurs each time, positions and heights of generated flames are different, if a detection visual angle of a dual-band pyroelectric infrared detector cannot detect the same equal numerical value of infrared rays emitted by the flames at different heights at the fire disaster, a great error can be caused on the flame position positioning accuracy of a horizontal dual-band pyroelectric infrared detector, the fire extinguishing effect of an automatic tracking positioning jet fire extinguishing device is directly influenced, and therefore, the pyroelectric infrared detector cannot timely detect various fire sources, inestimable loss can be caused to individuals or units encountering the fire disaster, and therefore, a part to be improved exists.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a dual-band pyroelectric sensor, which comprises the following specific scheme:
a dual-band pyroelectric sensor comprises a sensor body, a sensor mounting frame and a protective cover, wherein the sensor body is arranged on the sensor mounting frame, the protective cover covers the sensor body, the sensor body comprises an optical lens, a sensor module and a fixed seat, the sensor module is rotatably mounted on one side of the fixed seat, the optical lens covers the sensor module and is detachably connected with the fixed seat, a transparent plate is arranged on one side, facing the optical lens, of the protective cover, the sensor mounting frame can do reciprocating motion in the vertical direction relative to the transparent plate, and the fixed seat can do circular rotary motion relative to the sensor mounting frame;
a measuring distance/angle adjusting mechanism is arranged in the protective cover and comprises a screw rod sliding table sliding structure, an electromagnetic linkage assembly and a positioning rotating structure;
the sliding table body of the screw rod sliding table sliding structure can move up and down, the sliding table body is in transmission connection with the fixed seat through the electromagnetic linkage assembly, and the sliding table body can do circumferential contact sliding movement relative to the fixed seat;
but location revolution mechanic with the synchronous revolution motion is done to the lead screw body in the lead screw slip table sliding structure, just but location revolution mechanic with the fixing base transmission is connected.
Further, lead screw slip table sliding construction still includes driving motor, guide rail, driving motor can carry out positive and negative rotary motion, the total length of guide rail is less than the total length of lead screw body.
Furthermore, the positionable rotating structure comprises a driving wheel and a driven wheel, the driving wheel is coaxially connected with the lead screw body, an interval is arranged between the driving wheel and the end part of the guide rail, the driven wheel can be meshed with the driving wheel, and the driven wheel is rotatably installed at the bottom of the fixed seat.
Further, the positionable rotating structure further comprises a rotary encoder and a pulse visual counter, the rotary encoder is coaxially connected with the driven wheel, and the pulse visual counter is electrically connected with the rotary encoder.
Furthermore, a photoelectric positioning assembly is arranged between the driving wheel and the driven wheel and used for monitoring the meshing state of the driving wheel and the driven wheel.
Further, the electromagnetism linkage subassembly is including coil electromagnetism piece and no coil electromagnetism board, coil electromagnetism piece with slip table body fixed connection, no coil electromagnetism board fixed mounting in on the fixing base and with the laminating of coil electromagnetism piece sets up, establish respectively to rotatory cambered surface, lead smooth cambered surface for two sides that no coil electromagnetism board, coil electromagnetism piece set up relatively.
Further, no coil electromagnetism board is whole to be the arc, the fixing base deviates from one side of sensor module seted up with the fixed slot of no coil electromagnetism board adaptation.
Compared with the prior art, the invention has the following beneficial effects:
(1) when a fire disaster happens, the sensor body can detect infrared rays generated by flame, because a flame covering area at the place where the fire disaster happens has a certain space, the detection visual angle of the sensor body and the flame at different positions have the problem of height difference or angle dislocation, through arranging the measurement interval/angle adjusting mechanism, when the detection visual angle in the height direction needs to be changed, the electromagnetic linkage assembly is electrified, meanwhile, the screw rod sliding table structure works to drive the sliding table body to move, the fixed seat gradually moves downwards from the highest position along with the sliding table body in the vertical direction under the action of the electromagnetic linkage assembly, the interval between the sensor body and the flame is changed, the height difference is gradually reduced and leveled, in the process, the sensor body can finish the operation of detecting the flame at different heights, when the screw rod sliding table sliding structure continues to work, the positioning rotating structure rotates along with the screw rod body, thereby it is rotatory to drive the fixing base, and the detection visual angle of the sensor body on the fixing base and then rotatory, and the operation of detecting flame under different position angles can be accomplished to the sensor body, because the contact slip motion of circumference formula can be done to the fixing base to the slip table body, when the fixing base was rotatory, the relative slip table body of fixing base slides, can not influence the motion of slip table body at the in-process fixing base that the slip table body goes up and down.
In summary, on the basis of the driving mode of the screw rod sliding table sliding structure, the working characteristics of the screw rod sliding table sliding structure are fully utilized, the rotary motion of the screw rod sliding table sliding structure can realize the linear reciprocating motion and the circular motion of the sensor body, further the height difference, the direction and the angle between the sensor body and the flame can be simultaneously adjusted, the accuracy of the sensor body in detecting the specific position of the flame is improved, the adverse effect on the fire extinguishing effect is reduced, and the whole device is convenient to operate and is automatically operated.
(2) Through setting up the action wheel and following the driving wheel, when the rotary motion was done to the lead screw body, the action wheel rotated thereupon, descends after the certain distance as the sensor body until from driving wheel and action wheel meshing, the action wheel drives from the driving wheel rotation to drive whole fixing base and rotate, make the detection angle of sensor body change, because driving motor can carry out positive and negative rotary motion, the sensor body can carry out angle reciprocating rotation by a wide margin, will cover towards the detection scope of one side of transparent plate.
(3) Through setting up rotary encoder, the visual counter of pulse, rotary encoder is at the in-process monitoring from the rotatory rotation angle of driving wheel, and every rotates certain angle interval after, the visual counter of pulse counts the quantity of angle with the pulse number, and operating personnel is through watching the visual counter of pulse, and the angle change of clear, audio-visual judgement sensor body.
Drawings
FIG. 1 is an overall schematic view of an embodiment of the invention (shield in perspective);
fig. 2 is a schematic view showing the sliding table body moving to the end of the guide rail (the protection cover is in a perspective state) according to the present invention;
FIG. 3 is an overall schematic view showing a sliding structure of the screw rod sliding table according to the present invention;
FIG. 4 is an overall schematic view of the positionable swivel configuration of the present invention;
FIG. 5 is a schematic view of the present invention showing an electromagnetic linkage assembly between the sensor body and the ramp body;
fig. 6 is a schematic view showing the angular deviation of the sensor body relative to the sliding table body according to the present invention.
Reference numerals: 1. a protective cover; 2. a sensor body; 21. an optical lens; 22. a sensor module; 23. a fixed seat; 231. fixing grooves; 3. a sensor mounting bracket; 4. a screw rod sliding table sliding structure; 41. a sliding table body; 42. a screw rod body; 43. a drive motor; 44. a guide rail; 441. a limiting plate; 5. an electromagnetic linkage assembly; 51. a coil electromagnetic block; 511. a sliding guide arc surface; 52. a coil-less electromagnetic plate; 521. rotating the arc surface; 6. a positionable rotating structure; 61. a driving wheel; 62. a driven wheel; 63. a rotary encoder; 64. a pulse visual counter; 7. and a limit switch.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
As shown in fig. 1, a dual band pyroelectric sensor is generally used for automatically tracking and positioning the position of a fire detected by a jet fire extinguishing device in a fire, and based on the detection of infrared rays generated by flames at a certain distance, the pyroelectric sensor outputs a signal which is fed back to the jet fire extinguishing device in time. In order to ensure the safe and stable detection operation, the pyroelectric sensor comprises a sensor body 2, a sensor mounting frame 3 and a protective cover 1, wherein the sensor mounting frame 3 is used for bearing the sensor body 2, the protective cover 1 is used for playing a role in protecting in the fire process, and the sensor body 2 is covered on the protective cover.
As shown in fig. 2, based on the remote detection to flame, sensor body 2 includes optical lens 21, sensor module 22 and fixing base 23, one side of fixing base 23 is formed with the U font's recess, sensor module 22 rotates and installs in the recess of fixing base 23, it surveys the outside environment of recess to be convenient for sensor module 22 self-rotation, optical lens 21 is as the spotlight structure to infrared ray, be in the recess and cover and establish sensor module 22, optical lens 21 passes through connecting pieces such as screws and can dismantle with fixing base 23 and be connected, be convenient for installation and change.
One side of protection casing 1 towards optical lens 21 sets up to the transparent plate, and the sensor body 2 of being convenient for sees through the motion of transparent plate perception flame, for the change of the position of the follow-up sensor body 2 of cooperation and orientation, two lateral walls that protection casing 1 and transparent plate adjacent set up also can adopt the transparent plate. Sensor mounting bracket 3 is as the bearing structure of sensor body 2, for the position change of the follow-up sensor body 2 of cooperation, and sensor mounting bracket 3 can be relative the transparent plate and be the up-and-down motion of vertical side, for avoiding sheltering from the sight between the transparent plate of sensor body 2 orientation, sets up between the lateral wall of sensor mounting bracket 3 and protection casing 1 except that the transparent plate and leads smooth structure.
In order to realize that the sensor body 2 detects flames at different positions, a measuring distance/angle adjusting mechanism is arranged in the protective cover 1, the position of the sensor body 2 in the vertical direction is adjusted through the measuring distance/angle adjusting mechanism, the detection angle of the sensor body 2 on the horizontal plane is adjusted, and then the height difference, the direction and the angle between the sensor body 2 and the flames can be adjusted. The measuring distance/angle adjusting mechanism specifically comprises a screw rod sliding table sliding structure 4, an electromagnetic linkage assembly 5 and a positioning rotating structure 6.
With reference to fig. 1 and 3, in order to adjust the position of the sensor body 2 in the vertical direction, the present invention provides a screw sliding structure 4, the screw sliding structure 4 is substantially similar to a sliding block device of an electric screw body 42 in the prior art, the sliding block body 41 of the screw sliding structure 4 can move up and down, except for the sliding block body 41 and the screw body 42, the screw sliding structure 4 further includes a driving motor 43 and a guide rail 44, the driving motor 43 can rotate forward and backward, the driving motor 43 can drive the sliding block body 41 to move up or down when operating, the difference is that the total length of the guide rail 44 is smaller than the total length of the screw body 42, so as to limit the movement range of the sensor body 2 in the vertical direction, so that the sensor body 2 moves a certain distance relative to the driving motor 43, even if the driving motor 43 continues to rotate, the sensor body 2 also stops moving.
In summary, when the driving motor 43 is set to rotate forward in one direction, the sliding table body 41 moves from a position close to the driving motor 43 to the end of the guide rail 44, and then the driving motor 43 rotates backward to drive the sliding table body 41 to move backward, and it is known that the stroke of the sliding table body 41 is the length of the guide rail 44, and further, the movement stroke of the sensor body 2 is also the length of the guide rail 44. In order to realize automatic stop motion when the sliding table body 41 moves to the end position, a limit plate 441 is arranged at the tail end of the guide rail 44 far away from the driving motor 43, a limit switch 7 electrically connected with the driving motor 43 is correspondingly arranged on the sliding table body 41, when the sliding table body 41 moves to the tail end of the guide rail 44 from a position close to the driving motor 43 under the limit action of the guide rail 44, the limit switch 7 collides with the limit plate 441, and the limit switch 7 can feed back the driving motor 43 to stop or reversely rotate.
With reference to fig. 2 and 5, in order to realize that the lead screw sliding table sliding structure 4 drives the sensor body 2 to move along the vertical direction, the sliding table body 41 is in transmission connection with the fixing seat 23 through the electromagnetic linkage assembly 5, when the electromagnetic linkage assembly 5 is powered on, the sliding table body 41 moves to drive the fixing seat 23 to move, and when the electromagnetic linkage assembly 5 is powered off, the sliding table body 41 moves, and the fixing seat 23 remains static. In detail, the electromagnetic linkage assembly 5 includes a coil electromagnetic block 51 and a coil-free electromagnetic plate 52, the coil electromagnetic block 51 is fixedly connected to one side of the sliding table body 41, the coil-free electromagnetic plate 52 is arc-shaped as a whole, a fixing groove 231 adapted to the coil-free electromagnetic plate 52 is formed on one side of the fixing base 23 away from the sensor module 22, the fixing groove 231 is semi-cylindrical, the coil-free electromagnetic plate 52 is fixedly installed in the fixing groove 231 and is attached to the coil electromagnetic block 51, when the coil electromagnetic block 51 is connected to a circuit, a magnetic force is generated to tightly attach the coil-free electromagnetic plate 52, so as to integrate the fixing base 23 and the sliding table body 41, the fixing base 23 can be driven to move by the sliding table body 41, when the sliding table body 41 drives the sensor body 2 to move to reach a suitable detection visual angle, the driving motor 43 is controlled to stop moving and keep energizing the coil electromagnetic block 51, under the traction force of the electromagnetic linkage assembly 5 and the sliding table body 41, the sensor body 2 is kept at the same position to detect flames at the same height.
In combination with the above, when the sliding table body 41 moves to the end of the guide rail 44, the driving motor 43 stops rotating or rotates reversely, at this time, if the power supply to the coil-containing electromagnetic block 51 is cut off, the coil-containing electromagnetic block 51 can no longer suck the coil-free electromagnetic plate 52, and if the driving motor 43 rotates reversely and continues to drive the sliding table body 41 to move, at this time, the fixed base 23 and the sensor body 2 continue to remain stationary because the fixed base 23 is separated from the transmission relation with the sliding table body 41.
With reference to fig. 5 and 6, in order to adjust the rotation angle of the sensor body 2, the present invention is provided with the positionable rotation structure 6, the positionable rotation structure 6 and the screw rod body 42 in the screw rod sliding structure 4 perform synchronous rotation, and the positionable rotation structure 6 is in transmission connection with the fixed seat 23, the synchronous rotation occurs here after the sensor body 2 is separated from the driving action of the sliding table body 41, when the driving motor 43 continues to rotate in the opposite direction, the fixed seat 23 performs circular motion on the horizontal plane under the action of the positionable rotation structure 6, so as to realize the angle deviation of the whole sensor body 2, the angle deviation here is to drive the sensor module 22 to rotate integrally on the basis that the sensor module 22 can rotate by itself, therefore, when the whole sensor body 2 deviates by a certain angle, the angles generated by the self-rotation of the sensor module 22 can be accumulated, thereby further extending the coverage of the angle of view detected by the sensor module 22.
Because the angle of the circular rotation motion for one circle is 360 degrees, the rotation of the sensor body 2 and the self-rotation of the sensor module 22 are overlapped by a certain angle, in the invention, the synchronous rotation motion of the positionable rotating structure 6 does not need to be set to be the 360-degree circular motion, after the effective detection angle of the sensor module 22 which can rotate relative to the fixed seat 23 is measured, the specific angle of the positionable rotating structure 6 which needs to drive the sensor body 2 to rotate can be calculated, and the sensor module 22 can finally realize the complete 360-degree circular motion.
The whole device can be installed on a certain indoor side wall, the sensor module 22 can complete monitoring of the whole indoor space only by rotating for half a circle, therefore, as shown in fig. 5, the whole sensor body 2 can stop rotating when rotating to be abutted against the guide rail 44, at this moment, the travel switch arranged on the guide rail 44 can be triggered and fed back to the driving motor 43, the driving motor 43 can stop rotating, and the sensor body 2 is represented to rotate to the tail end.
The positionable rotating structure 6 comprises a driving wheel 61 and a driven wheel 62, the driving wheel 61 is coaxially connected with the lead screw body 42, a gap is arranged between the end parts of the driving wheel 61 and the guide rail 44, and when the driving wheel 61 is driven by the driving motor 43 to rotate, the guide rail 44 does not obstruct the normal movement of the driving wheel 61 in combination with the fact that the length of the guide rail 44 is shorter than that of the lead screw body 42. Follow driving wheel 62 and rotate and install in the bottom of fixing base 23, follow driving wheel 62 and the meshing setting of action wheel 61, this meshing relation inlays for the part and establishes, avoid taking place the dislocation from driving wheel 62 and action wheel 61, can be connected with the smooth transmission of location revolution mechanic 6 for realizing fixing base 23 of sensor body 2, when sensor body 2 is along with the terminal of the guide rail 44 of slip table body 41 motion, fixing base 23 and sensor body 2 originally can remain static, but the state of follow driving wheel 62 and action wheel 61 the two sets up to the meshing this moment, and action wheel 61 can support the weight of whole sensor body 2, along with driving motor 43's reverse motion, at action wheel 61, under the transmission effect of follow driving wheel 62, sensor body 2 realizes the rotation of certain angle.
It can be known that the positionable rotating structure 6 is a pure mechanical structure, no extra power is needed to be arranged to control the rotation of the driving wheel 61 and the driven wheel 62, when the driving motor 43 rotates forward to complete the downward movement of the sliding table body 41, the driving motor 43 is used to drive the screw rod body 42 to rotate in the reverse direction, so as to realize the angular offset of the sensor body 2, therefore, on the basis of the driving mode of arranging the screw rod sliding table sliding structure 4, the working characteristics of the invention are fully utilized, the rotating motion of the screw rod sliding table sliding structure 4 can realize the linear reciprocating motion and the circular motion of the sensor body 2, the power resources are saved, the configuration of intermediate accessories is reduced, and the occupied installation space is reduced.
In the invention, the sensor body 2 performs circular motion and the sensor module 22 performs self-rotation motion to roughly determine the flame area, then the sensor body 2 performs vertical motion in the height direction, and under the action of the optical lens 21, the detection visual angle of the sensor module 22 can detect a plurality of flames with the same height every time the sensor module 22 is at one height, and the flames are fed back to the automatic tracking and positioning jet flow fire extinguishing device, and the automatic tracking and positioning jet flow fire extinguishing device responds in time to perform fixed-point water flow injection on the detected flames.
Specifically, when the sensor body 2 is located at a higher position, because flames are dense near the bottom, detection is facilitated, the electromagnetic linkage assembly 5 is powered on, the whole sensor body 2 is driven by the sliding table body 41 to move to the tail end of the guide rail 44, the electromagnetic linkage assembly 5 is powered off, meanwhile, the travel switch is triggered and fed back to the driving motor 43, the positioning rotating structure 6 can be matched, the driving motor 43 drives the screw rod body 42 to rotate reversely, the whole sensor body 2 is driven to perform angle deviation until the sensor module 22 detects a general flame region, the electromagnetic linkage assembly 5 is powered on, the fixing seat 23 and the sliding table body 41 are limited into a whole by the electromagnetic linkage assembly 5 again, the screw rod body 42 continues to rotate reversely, the sliding table body 41 drives the whole sensor body 2 to move upwards gradually, and flames of different heights are detected one by one. In this embodiment, in order to avoid the speed of the rotation and up-and-down movement of the sensor body 2 being too fast, the driving motor 43 can be set to perform the intermittent rotation, so as to finally realize the angular deviation, the upward movement or the downward movement of the sensor body 2 at a certain time interval, and in this time interval, the automatic tracking and positioning jet fire extinguishing device can continuously spray water to the same flame.
Because sensor mounting bracket 3 can only be the ascending reciprocating sliding motion of vertical direction, for the local rotary motion of cooperation sensor, fixing base 23 can do the rotary motion of circumferencial formula relative sensor mounting bracket 3, when fixing base 23 was rotatory under the drive of follow driving wheel 62, the relative sliding motion is done along the pitch arc to the surface of sensor mounting bracket 3 for the axis of follow driving wheel 62 as the center to the upper end of fixing base 23. Similarly, in order to avoid the influence on the movement of the sliding table body 41 when the sensor rotates, the sliding table body 41 can perform a circumferential contact sliding movement with respect to the fixed base 23, specifically, two side surfaces of the non-coil electromagnetic plate 52 and the coil electromagnetic block 51 which are oppositely arranged are respectively set as a rotating arc surface 521 and a sliding guide arc surface 511, when the driving motor 43 keeps rotating, the driving wheel 61 works, and the sliding table body 41 also moves upwards or downwards, when the sensor body 2 rotates, the non-coil electromagnetic plate 52 on the fixed base 23 rotates with respect to the coil electromagnetic block 51 under the action of the offset sliding of the rotating arc surface 521 and the sliding guide arc surface 511, only a part of friction force exists between the two, and almost no pushing force exists on the sliding table body 41, so that the sliding table body 41 can normally move upwards or downwards.
In order to facilitate accurate control of the rotation angle of the sensor body 2 each time, the positionable rotating structure 6 further comprises a rotary encoder 63 and a pulse visual counter 64, the rotary encoder 63 adopts a rotary incremental encoder to convert displacement into periodic electric signals, the electric signals are converted into counting pulses, the number of the pulses is used for representing the size of the displacement, the rotary encoder 63 is coaxially connected with the driven wheel 62, when the driven wheel 62 rotates, the rotary encoder 63 detects the rotation angle of the driven wheel 62, the pulse visual counter 64 is electrically connected with the rotary encoder 63, the position of the pulse visual counter 64 is known by the pulse visual counter 64, and when the sensor body 2 works, an operator can judge whether the angle of the sensor body 2 changes or not through the indication number appearing on the pulse visual counter 64 after the rotary encoder 63 outputs the pulses.
In this embodiment, the rotation angle monitoring is realized for the driven wheel 62 through the rotary encoder 63, so as to realize the rotation angle monitoring for the driving wheel 61, at this time, the screw rod body 42 is in the reverse rotation state, the sliding table body 41 is in the upward moving state, during the rotation process of the driven wheel 62, a certain proportional relation exists between the upward moving height of the sliding table body 41 and the rotation angle of the driving wheel 61, the upward moving height of the sliding table body 41 can be converted by setting a calculation formula, because the sensor body 2 needs to be driven by the sliding table body 41 to move upward again after a certain angle offset, therefore, the upward moving height of the sliding table body 41 needs to be smaller than the height of the electromagnetic linkage assembly 5, it is ensured that the coil electromagnetic block 51 can be normally adsorbed with the coil-free electromagnetic plate 52, the upward moving height of the sliding table body 41 is related to the rotation speed of the driving motor 43, the pulse visual counter 64 can be provided with a controller between the driving motor 43, the rotating speed of the driving motor 43 is adjusted to a proper numerical value after the conversion of a control circuit in the controller, the rotating speed of the driving motor 43 can be changed, and the moving speed of the sliding table body 41 is accurately controlled, so that the normal work of the electromagnetic linkage assembly 5 is ensured.
Still be provided with photoelectric type locating component between action wheel 61 and the follow driving wheel 62, photoelectric type locating component is used for monitoring action wheel 61, the engaged state from driving wheel 62, specifically include photoelectric emitter and photoelectric receiver, photoelectric emitter, photoelectric receiver is coaxial setting respectively at follow driving wheel 62, on action wheel 61, when photoelectric receiver received photoelectric emitter's light, alright judge action wheel 61 and follow driving wheel 62 meshing, photoelectric emitter and photoelectric receiver remain light receiving and dispatching state throughout this moment, when action wheel 61 meshes with from driving wheel 62, driving motor 43 need reverse drive sensor body 2 and carry out the angular deviation this moment. If the sensor body 2 moves down to the end but the driving pulley 61 is not engaged with the driven pulley 62, the angular displacement of the sensor body 2 cannot be achieved even if the driving motor 43 rotates.
Therefore, the photoelectric receiver can be electrically connected with the controller corresponding to the driving motor 43, the photoelectric receiver and the limit switch 7 jointly control the change of the direction of the driving motor 43, and only when the photoelectric receiver receives the optical signal and the limit switch 7 is triggered by the limit plate 441, the driving motor 43 stops the forward rotation and starts the reverse rotation, so that the operation error is avoided. Optimally, if the limit switch 7 is triggered by the limit plate 441 but the photoelectric receiver does not receive the optical signal within a certain time, the controller can directly control the driving motor 43 to stop rotating, the reversing motion is not triggered any more, and an operator is reminded that the sensor body 2 fails and needs to be repaired in time.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (7)
1. A dual-band pyroelectric sensor comprises a sensor body (2), a sensor mounting rack (3) and a protective cover (1), the sensor body (2) is arranged on the sensor mounting rack (3), the sensor body (2) is covered by the protective cover (1), the sensor body (2) comprises an optical lens (21), a sensor module (22) and a fixed seat (23), the sensor module (22) is rotatably arranged on one side of the fixed seat (23), the optical lens (21) covers the sensor module (22) and is detachably connected with the fixed seat (23), one side of the protective cover (1) facing the optical lens (21) is provided with a transparent plate, characterized in that the sensor mounting rack (3) can do reciprocating motion in the vertical direction relative to the transparent plate, the fixed seat (23) can do circumferential rotary motion relative to the sensor mounting rack (3);
a measuring distance/angle adjusting mechanism is arranged in the protective cover (1), and comprises a screw rod sliding table sliding structure (4), an electromagnetic linkage assembly (5) and a positioning rotating structure (6);
the sliding table body (41) of the screw rod sliding table sliding structure (4) can move up and down, the sliding table body (41) is in transmission connection with the fixed seat (23) through the electromagnetic linkage assembly (5), and the sliding table body (41) can do circumferential contact sliding movement relative to the fixed seat (23);
the positioning rotating structure (6) and the screw rod body (42) in the screw rod sliding table sliding structure (4) are in synchronous rotating motion, and the positioning rotating structure (6) is in transmission connection with the fixed seat (23).
2. The dual-band pyroelectric sensor of claim 1, wherein the lead screw sliding structure (4) further comprises a driving motor (43) and a guide rail (44), wherein the driving motor (43) can perform positive and negative rotation movement, and the total length of the guide rail (44) is smaller than that of the lead screw body (42).
3. The dual-band pyroelectric sensor of claim 2, wherein the positionable rotating structure (6) comprises a driving wheel (61) and a driven wheel (62), the driving wheel (61) is coaxially connected with the lead screw body (42), a space is arranged between the driving wheel (61) and the end of the guide rail (44), the driven wheel (62) can be meshed with the driving wheel (61), and the driven wheel (62) is rotatably mounted at the bottom of the fixed seat (23).
4. Dual band pyroelectric sensor according to claim 3 characterized in that the positionable rotating structure (6) further comprises a rotary encoder (63), a pulse visual counter (64), the rotary encoder (63) being coaxially connected with the driven wheel (62), the pulse visual counter (64) being electrically connected with the rotary encoder (63).
5. The dual-band pyroelectric sensor of claim 3, wherein an optoelectronic positioning assembly is arranged between the driving wheel (61) and the driven wheel (62), and is used for monitoring the meshing state of the driving wheel (61) and the driven wheel (62).
6. The dual-band pyroelectric sensor of claim 1, characterized in that the electromagnetic linkage assembly (5) comprises a coil electromagnetic block (51) and a coil-free electromagnetic plate (52), the coil electromagnetic block (51) is fixedly connected with the sliding table body (41), the coil-free electromagnetic plate (52) is fixedly mounted on the fixed seat (23) and is attached to the coil electromagnetic block (51), and two opposite side surfaces of the coil-free electromagnetic plate (52) and the coil electromagnetic block (51) are respectively set as a rotating arc surface (521) and a sliding guide arc surface (511).
7. The dual-band pyroelectric sensor of claim 6, wherein the coil-less electromagnetic plate (52) is arc-shaped as a whole, and a fixing groove (231) matched with the coil-less electromagnetic plate (52) is formed on one side of the fixing seat (23) away from the sensor module (22).
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