583 results about "Photoswitch" patented technology

The invention relates to the technical field of industrial automation control, and particularly discloses a rotating speed detection and closed-loop control system based on photoelectric sensing and a PLC, and the system comprises at least one rotating body which is a rotating speed controlled object, and the surface of the rotating body is provided with a configurable number of reflection mark areas or speed measurement holes; the proximity photoelectric switches are in one-to-one correspondence with the rotating bodies, are aligned with the reflection mark areas or the speed measurement holes, and are used for detecting rotation information of the rotating bodies and generating original pulse signals; a high-speed counter input port of the PLC is electrically connected with signal output ends of the proximity photoelectric switches, and a pulse preprocessing module, a rotating speed calculation module, a deviation processing module, a control algorithm module and a signal adaptation module are arranged in the PLC. The PLC and the proximity photoelectric switch which are widely applied in the industrial field and high in popularity rate are adopted as core technical components, and expensive special servo controllers, encoders and other devices are not needed, so that the hardware purchase cost of the system is greatly reduced.

The embodiment of the invention provides a real-time collection method and system for welding heat input, and the method comprises the steps: sensing the displacement movement of a welding gun or a welding wire through a diffuse reflection photoelectric switch array installed on the surface of a pipeline, and generating a corresponding pulse trigger signal; current data and voltage data of a welding loop are sensed through a Hall sensing system, and corresponding analog electric signals are generated; synchronously acquiring the pulse trigger signal and the analog electric signal through a multi-channel data acquisition device, and converting the analog electric signal into a digital signal with a timestamp; real-time welding speed data are calculated according to the time sequence of the pulse trigger signals and the preset space geometrical relation of the diffuse reflection optoelectronic switches; performing multi-stage filtering processing on the current data and the voltage data; a unified timestamp is determined, and time sequence matching is conducted on the filtered current data, the filtered voltage data and the filtered welding speed data based on the unified timestamp; and calculating to obtain a welding heat input value.

The invention relates to the technical field of wind power gear forging, in particular to forging equipment for wind power gear forgings and a forging method of the forging equipment. A protective vertical plate is fixed to the corner of the top of the base, a top plate is installed at the top of the protective vertical plate, and a forging hydraulic machine is installed at the middle end of the top plate. Wherein the forging platform is located at the top of the base; wherein the number of the overturning bases is two, the two overturning bases are installed at the two ends of the top of the forging platform, and guide grooves are formed in the upper ends of the overturning bases. By means of the arrangement of the overturning base, manual near-field operation is replaced, safety risks caused by high-temperature and heavy forgings are completely eradicated, safe interlocking is formed by the groove type photoelectric switch and the Z-shaped shielding piece, it is ensured that the action is accurate and reliable, the overturning time is shortened to be the shortest, a high-temperature forging window of the forgings is fully utilized, and the heating frequency is reduced.

The invention discloses a high-precision liquid level measuring device and method based on sweep frequency interference measurement, belongs to the technical field of optical-mechanical-electrical integrated measurement, and is used for high-precision liquid level measurement. The light path is composed of a frequency sweep correction light path and a measurement calibration light path. The device comprises a sweep-frequency light source, an optical fiber splitter, a high-speed acquisition card, a computer, an optical fiber circulator, an optical fiber reflector, a Fabry-Perot (FP) etalon, a balanced photoelectric detector (BPD), a liquid level measuring probe and the like. The FP etalon realizes a sweep frequency correction function, a measurement calibration light path switches channels through the one-to-two photoelectric switch, and high-speed signal acquisition is carried out through the BPD and the high-speed acquisition card. The measuring process is free of mechanical movement and has the advantage of being free of maintenance; the FP etalon is introduced for nonlinear frequency sweeping calibration, the measurement precision is improved, the micron-level measurement precision can be achieved under the better experiment condition, and the non-contact measurement method can meet the requirement for high-precision liquid level measurement in the fields of chemistry, chemical engineering and the like.

The invention discloses a paper feeding device and method for a radioactive aerosol activity monitor, and belongs to the technical field of nuclear radiation measuring instruments. The device comprises a paper feeding case and perforated filter paper; a paper feeding power assembly and a filter paper supporting assembly are arranged in the paper feeding case, and the paper feeding power assembly comprises a main motor and an auxiliary motor; the filter paper supporting assembly comprises a first filter paper shaft and a second filter paper shaft; a photoelectric switch is arranged on the second filter paper shaft; the method comprises the following steps: 1, mounting filter paper; 2, feeding filter paper; and 3, paper feeding detection. Through a dual-motor mode, the perforated filter paper is synchronously controlled to move, and the fault that the filter paper slips or is stacked under the condition that a driven shaft is loosened under the condition of a single motor, or the filter paper is broken due to the fact that the motor pulls the filter paper under the fastening condition is solved; the unstable factors that under the condition of a traditional single motor, the tightness degree of the driven shaft cannot guarantee the standard performance of adjustment every time due to manual non-standard adjustment and the driven shaft can be gradually loosened and needs to be adjusted again can be directly removed, and the operation stability of the whole device is guaranteed.

The invention provides a non-contact shadowless lamp self-adjustment control method and system based on infrared induction, and relates to the technical field of shadowless lamp control, and the method comprises the steps: arranging a reflective infrared photoelectric switch to a predetermined entrance and exit position of a target space, and carrying out the dynamic monitoring to obtain a first monitoring result; if the first preset constraint is met, activating a pyroelectric human body infrared sensor to track and monitor the first moving target to obtain a first tracking result; if the second preset constraint is met, performing statistics to obtain a first target total number; taking the first target total number as a lighting judgment basis to obtain a self-adjusting control instruction, and calling a non-contact control mechanism; and performing self-adjustment control on the target shadowless lamp. The technical problems that in the prior art, a shadowless lamp usually depends on a manually set static mode, dynamic adjustment is difficult to achieve according to changes in an actual scene, the flexibility and adaptability of illumination are affected, and then the illumination effect is not ideal are solved.

The utility model relates to the technical field of chain type machines, and discloses a fire-fighting automatic overturning chain type machine which comprises a first front-end chain type machine, a first support is installed at the lower end of the first front-end chain type machine, and a first chain is installed in the first front-end chain type machine through a first transmission shaft. According to the fire-fighting automatic overturning chain type machine, the overturning chain type machine is arranged between the first front-end chain type machine and the second front-end chain type machine, and a fireproof rolling shutter door is installed at the upper end of the overturning chain type machine, so that when a fire disaster occurs, the fireproof rolling shutter door moves downwards, and meanwhile, a photoelectric switch is triggered to control a first supporting plate to start; the first supporting plate drives the overturning chain type machine to overturn, after the overturning chain type machine overturns, an opening is formed between the first front-end chain type machine and the second front-end chain type machine, meanwhile, the fireproof rolling shutter door can move downwards, and then the two ends of the first front-end chain type machine and the two ends of the second front-end chain type machine are isolated. Further spreading of the fire behavior when a fire disaster occurs is prevented; and unnecessary loss is reduced.

A novel composition comprising a multiple-funnel trap, a light source, a solar panel, a battery, a photoswitch to control the light source, and a supporting structure can be effectively used to capture night-flying adult kissing bugs (Hemiptera: Reduviidae).

An automatic feeding control system for steel coil uncoiling comprises a storage seat, a feeding trolley and an uncoiling machine which are sequentially arranged, and a lifting frame is arranged on the feeding trolley; a steel coil distance laser range finder, a steel coil outer diameter laser range finder, an encoder and an original point position detection switch are mounted on the uncoiling machine; a descending position detection switch is arranged on the feeding trolley; a material correlation photoelectric switch, a material storage stop detection switch, a steel coil inner diameter correlation photoelectric switch, a material storage speed reduction position detection switch, a steel coil position confirmation correlation photoelectric switch, an uncoiling speed reduction position detection switch and an uncoiling stop position detection switch are sequentially arranged in the direction from the material storage seat to the uncoiling machine. The problems existing in an existing uncoiling feeding mode are solved, the whole process does not need participation of personnel, the influence of dust and noise on the body health of operators is effectively reduced, and the threat to life safety in the feeding process is thoroughly eradicated; each link is detected and confirmed, and the whole feeding process is accurate and rapid.

The invention relates to an anti-collision automatic iron oxide powder blowing device. The device comprises an anti-collision device, a lining plate, a hoisting hole, a device fixing bolt, an air pipe fixing pipe clamp, an electric control valve, a bypass hand valve, a spraying beam pipeline, an air blowing nozzle, a photoelectric switch and the like. The anti-collision unit is a push-pull type pickling unit, has single uncoiling and single coiling, multiple steel grades, high strength, large thickness and poor head and tail plate shapes, and can cause damage to a spray beam nozzle, so that an anti-collision design needs to be added. Wherein the iron oxide powder is a hot-rolled pickled plate (coil) oxide scale which is not uniform, a large amount of crushed iron oxide powder falls off from the surface of the strip steel after the scale is broken by a crease-resistant roller, the iron oxide powder is adhered to the roller surface of a straightening machine to generate surface indentations when passing through the straightening machine, the surface quality defect of the strip steel is caused, the waste reduction of a unit is increased, and the production cost is reduced. Product quality is affected, and dissatisfaction of customers is caused. By designing the anti-collision automatic iron oxide powder purging device, strip steel threading is automatically started through signal purging of the photoelectric switch, broken iron oxide powder falls off from the surface of the strip steel in time, cleanliness of the roller surface of a straightening machine is guaranteed, the indentation defect generated due to the fact that the iron oxide powder adheres to the roller surface of the straightening machine is eliminated, the product quality is improved, and the production efficiency is improved. And the requirements of customers are met.

The utility model discloses a sliding type cup storage unit for a blood coagulation analyzer, and relates to the technical field of medical instruments, the sliding type cup storage unit comprises a loading assembly, the loading assembly comprises a mounting plate, a slot, a guide rail, a groove and a correlation type photoelectric switch, the slot is formed in the rear end of the mounting plate in a penetrating manner, and the guide rail is arranged in the slot; and L-shaped structure guide rails with opposite notches are symmetrically fixed to the two sides of the top of the mounting plate. According to the sliding type cup storage unit for the blood coagulation analyzer, the tray frame is designed to be in a placement mode that the side face is inserted into the mounting plate according to a sampling mode of the blood coagulation analyzer, and when the sliding type cup storage unit is used, the tray frame slides in the guide rails through the rolling wheels on the inner sides of the two ends and is clamped into the grooves at the preset positions to achieve limiting; the L-shaped structure extension plates on the outer sides of the two ends of the tray rack are matched with the correlation type photoelectric switch to trigger a switch signal, so that the tray rack is confirmed to be mounted in place, and the sample tray is conveniently positioned and sampled when the sample tray is subsequently fed into a blood coagulation analyzer.

The utility model discloses a blast bead form sorting device, which relates to the technical field of blast beads and particularly comprises a circular turntable and a base, the upper surface of the base is rotatably connected with the circular turntable, the lower surface of the base is fixedly connected with a servo motor, the lower surface of the base is fixedly provided with a high-speed rejecting valve group, and the high-speed rejecting valve group is fixedly connected with the base. A cleaning valve group is fixedly mounted on the upper surface of the base, a defective blast bead recovery device is fixedly mounted on the upper surface of the base, and a frame is arranged on the outer surface of the base. According to the blasting bead form sorting device, it is guaranteed that defects detected by an industrial camera can be correctly removed at the removing position, signal processing is very important, the camera is triggered to take pictures through a correlation photoelectric switch, the position is accurately calculated through a servo motor absolute value encoder, and signal transmission and processing are conducted within millisecond-level time; normal elimination of defective blast beads is ensured, and good products fall into a product recovery port, so that an automatic screening effect is achieved.

The utility model relates to the technical field of feeding crown blocks, in particular to an electrolytic bath feeding device capable of reducing raised dust, which comprises a crown block and a storage bin positioned above the crown block, a crown block stock bin is fixedly connected to the crown block, a crown block stock bin inlet is formed in the top of the crown block stock bin, and a storage bin discharging pipe is arranged at the bottom of the storage bin; an inlet of the crown block stock bin is fixedly connected with the bottom end of a discharging cloth bag, the top end of the discharging cloth bag is fixedly connected with a hard ring, and the hard ring is fixedly connected with an air cylinder used for driving the hard ring to ascend and descend. The cylinder is connected with an electromagnetic valve for controlling the cylinder to extend and retract through an air pipe, the bottom end of the storage bin is fixedly connected with a photoelectric switch emitter, the top end of the crown block bin is fixedly connected with a photoelectric switch receiver, and the photoelectric switch receiver is electrically connected with the electromagnetic valve; when the crown block stock bin receives materials, the discharging cloth bag can be lifted and sleeved on the outer side of the discharging pipe of the storage bin, so that raised dust can be reduced, material waste can be reduced, and environmental pollution in a workshop can be reduced.

The invention relates to a tunnel secondary lining concrete filling state real-time monitoring system which is characterized in that a secondary lining cavity is defined by a secondary lining template in a tunnel, the system comprises a sensor array located in the secondary lining cavity, the sensor array comprises a plurality of rows of optoelectronic switches distributed in the extending direction of the tunnel, and the optoelectronic switches in the same row are distributed in the circumferential direction of the tunnel; the signal processing and acquisition unit is responsible for supplying power to the photoelectric switch and converting the received signal of the photoelectric switch into a signal displayed by a display; and the data processing and displaying unit is responsible for displaying the signals transmitted by the signal processing and collecting unit on a reality device. The invention aims to provide the tunnel secondary lining concrete filling state real-time monitoring system capable of acquiring the cavity in real time, and the problem that the existing cavity can only be acquired afterwards is solved.

The present invention provides a special vehicle disinfection cabin, which includes a vehicle disinfection cabin with a vehicle parking space, wherein the vehicle disinfection cabin is provided with a vehicle position identification component, a personnel stay identification component and a vehicle disinfection component, and the vehicle position identification component includes a first photoelectric switch and a second photoelectric switch; in the present invention, the vehicle position is judged by a photoelectric switch arranged on the inner wall of the cabin. When the vehicle reaches the predetermined position, the roller shutter is automatically closed, the alarm prompts the vehicle to stop, and reminds the driver and passengers to get off, and reminds that the automatic process is about to begin; when the infrared thermal imager shows that there are no drivers or passengers in the vehicle parking space, or after the last driver or passenger walks out of the disinfection cabin and presses a one-button start button; the vehicle surface is covered and disinfected by 15-micron atomization, and the interior of the vehicle is covered and disinfected by 5-micron atomization. When the particulate matter solubility and the humidity in the cabin reach predetermined values, the circulating air system in the cabin is started.

The invention relates to the field of automobile part detection, in particular to an integrated battery pack temperature acquisition wire harness rapid detection device which comprises a fixed support, a cross beam, a transverse sliding rail, a photoelectric switch, a position adjusting assembly, a telescopic sleeve assembly, a horizontal guide rail assembly and a hot air mechanism. The bottom of the fixing support is arranged on the working ground, a cross beam is installed on the fixing support, a transverse sliding rail matched with the position adjusting assembly is fixedly installed on the cross beam, and the position adjusting assembly is installed on the transverse sliding rail in a sliding mode and used for driving the telescopic sleeve assembly to move and adjust. In the specific using process of the rapid detection device, automatic, efficient and high-precision temperature collection wire harness detection is achieved, manual intervention is avoided, the detection efficiency and reliability of a production line are remarkably improved, and the rapid detection device has the advantages of being simple in structure, convenient to operate and high in detection efficiency and detection precision.

The utility model discloses an adjustable photoelectric switch support which comprises a support assembly, a right-angle pipe fitting and a sliding installation seat, the right-angle pipe fitting comprises a vertical part and a horizontal part connected with the vertical part, the vertical part is movably arranged on the support assembly, the sliding installation seat is movably arranged on the horizontal part, and the sliding installation seat is used for installing a photoelectric switch. The position of the photoelectric switch can be adjusted through the sliding mounting seat and the right-angle pipe fitting, operation is simple, adjustment is convenient, the right-angle pipe fitting can effectively protect a cable of the photoelectric switch, faults are reduced, mounting is convenient and fast, dismounting is convenient, and the maintenance cost and time can be reduced.

The invention discloses a shuttle vehicle with a positioning unit, which belongs to the technical field of cargo transportation and comprises a shuttle vehicle body, a correlation photoelectric switch is mounted on the shuttle vehicle body, a check block is arranged at the correlation photoelectric switch, a sliding rail is arranged above the check block, and a sliding block in sliding fit with the sliding rail is fixedly arranged on the top surface of the check block. The sliding blocks are elastically connected with the sliding rails, inserting holes are formed in the top faces of the sliding blocks, and inserting rods matched with the inserting holes are elastically connected to the sliding rails. According to the device, through the arranged pressing strips, when a plurality of cargoes are stacked on the tray and a gap exists between every two adjacent cargoes, the two pressing strips can be inserted into the gap and gradually separated along with the two pressing strips, the pressing strips can tightly press the side faces of the cargoes, and in the process that the telescopic pallet fork drives the cargoes to move, the check blocks can be located in the gap between every two adjacent cargoes; therefore, light beams emitted by the emitter can be shielded, and normal use of the correlation photoelectric switch is facilitated.

The invention relates to the technical field of automatic packaging systems, in particular to an automatic packaging line weighing system which comprises at least one pair of photoelectric switches, a weighing device, a sorting device and a distributed control system. The photoelectric switch is used for detecting whether the product package enters or leaves the weighing area; the weighing device is used for weighing the weight of a product package; the sorting device is used for removing overweight or ultralight product packages; the distributed control system communicates with the photoelectric switch and the weighing device, and receives and processes the weight information of the product package; and the distributed control system is provided with a normal range of the weight of the product package and is used for comparing the actual weight of the product package with the normal range and executing operation based on a comparison result. The operation efficiency and the weighing precision of the automatic packaging line can be improved, and it is ensured that the product packaging weight meets the standard.

The utility model relates to the technical field of wind generating sets, in particular to a wind generating set tower door opening and closing signal detection device which comprises a mounting plate, the mounting plate is fixedly mounted on the inner wall of a door frame, the door frame is fixedly mounted on a tower, a tower door is hinged to an outward opening of the door frame, and a nut is rotatably mounted on one face, facing the tower door, of the mounting plate. A photoelectric switch sensor is arranged in the nut, and a reflector plate is fixedly installed on the surface of the inner side of the door frame. According to the wind generating set tower door opening and closing signal detection device, a photoelectric switch sensor is installed on a door frame, the photoelectric switch sensor is connected to a PLC in a main control module, when the PLC detects that a tower door signal is disconnected, an alarm signal is generated to prompt that a tower door is opened, and the alarm signal is uploaded to an SCADA monitoring system of a central control room; monitoring personnel judge whether processing is needed or not according to the operation and maintenance condition of the wind field.

The utility model provides an electric control device of a metal film-coated plate, which comprises a device shell, a reflection type photoelectric switch assembly is arranged at the bottom of the device shell, and the reflection type photoelectric switch assembly comprises a reflection type photoelectric switch plate and photoelectric switches which are arranged on two sides above the photoelectric switch plate in an array mode. Every two oppositely arranged photoelectric switches form a switch control reflection element, one photoelectric switch is used for transmitting a photoelectric signal, and the other photoelectric switch is used for receiving a reflection electric signal of an operator; a reflection type photoelectric switch board is arranged on the device shell, a structure layer board is arranged above the reflection type photoelectric switch board, two ends of the structure layer board are fixedly connected with two sides of the inner wall of the device shell, a plurality of hollow holes are arranged on the structure layer board, and the hollow holes are in one-to-one correspondence with the switch control reflection elements. An operator can start a control program of the electric control device in a contact or non-contact mode only by moving fingers to the position above the electric control device.

The utility model provides DAPI diluent cover glass stripping equipment, and belongs to the technical field of stripping equipment. Comprising a stripping box; the object containing groove is formed in the stripping box, the object containing groove is matched with the cover glass, and the object containing groove is used for containing the cover glass which is not stripped; the lower pressing plate is connected into the stripping box in a sliding mode, the lower pressing plate is located over the containing groove, the lower pressing plate is matched with the containing groove, and the lower pressing plate is used for pressing the unstripped cover glass downwards. According to the automatic stripping device for the cover glass, the purpose of automatically stripping the cover glass is achieved through the cooperation of the lower pressing plate, the spring, the storage groove, the push plate and the push rod, and the purposes of accurately detecting the number of the cover glass, orderly storing and conveniently discharging the cover glass are achieved through the cooperation of the reflector, the photoelectric switch, the lifting frame, the material pushing plate, the connecting block, the first threaded rod and other structures.

The present invention provides a real-time fusion millimeter wave imaging frame increase method, which can solve the problems of poor real-time imaging and low acquisition frame rate of existing systems, resulting in poor continuity of video images and non-smooth display. The original single-frame millimeter wave imaging image of the target person under test entering the security inspection channel at the current moment, which is acquired by the millimeter wave security inspection imager; the direction of travel and the area where the target person under test is located in the security inspection channel are determined according to the current signal status of each photoelectric switch; the imaging target area is separated from the original single-frame millimeter wave imaging image at the current moment and transferred to a newly added background image to form an image to be analyzed; the imaging target area in the image to be analyzed is partitioned and the imaging offset direction of the target person under test at the next moment is predicted; the imaging target area is offset and the offset imaging target area is integrated with the background area in the original single-frame millimeter wave image to form a newly added image frame.

The utility model discloses a photoelectric switch electrical characteristic test fixture, relates to the technical field of photoelectric switch performance test, and mainly aims to accurately simulate the operation environment of a photoelectric switch under different working distances. According to the main technical scheme, the photoelectric switch electrical characteristic testing jig comprises a testing table, a camera obscura is arranged on the testing table, a first vertical plate and a second vertical plate are oppositely arranged in the camera obscura, a first light hole is formed in the first vertical plate and serves as a light path channel of the transmitting end of a photoelectric switch, and a second light hole is formed in the second vertical plate and serves as a light path channel of the transmitting end of the photoelectric switch. A second light hole is formed in the second vertical plate, the second light hole is a light path channel of the receiving end of the photoelectric switch, and the spacing distance between the first light hole and the second light hole is adjustable.

1. Name of the product in this design: Photoelectric switch (PX). 2. Application of this design: This design is used for switches. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The utility model relates to the technical field of slitting machines, in particular to a protective device for a slitting machine cutter table, the slitting machine cutter table comprises a machine base and two slitting rollers arranged on the machine base in a synchronous rotation mode, and the protective device comprises a first fixing plate, a second fixing plate, a protective plate and a photoelectric switch. The first fixing plate, the second fixing plate and the photoelectric switch are fixedly arranged on the machine base, the protection plate is detachably arranged between the first fixing plate and the second fixing plate and located on the inlet sides of the two slitting rollers, and the photoelectric switch is located on the inlet sides of the two slitting rollers and located below the protection plate. The protective device for the cutter table of the slitting machine is simple in structure and convenient to operate, a worker is blocked through the protective plate, and once the photoelectric switch detects the position of the worker, the two slitting rollers stop rotating, so that the worker cannot stand on the inlet side to wipe a cutter head, and the working efficiency is improved. And fingers or arms of a worker are effectively prevented from being rolled into the cutter head from the inlet sides of the two slitting rollers.

The invention discloses a case anti-disassembly data protection device, and relates to the technical field of case anti-disassembly, and the device comprises a first protection assembly which comprises a groove-type correlation photoelectric sensor, and the groove-type correlation photoelectric sensor is arranged on a carrier plate and is used for triggering a first protection action when an upper cover of a case is detected to be opened; and the second protection assembly comprises a shielding case fixed on the carrier plate, a patch reflection type photoelectric switch and a data processor which are fixed on the carrier plate are arranged in the shielding case, and the second protection assembly is used for triggering a second protection action when detecting that the shielding case is opened. The technical problems that in the prior art, an anti-dismantling device is prone to being affected by vibration and a strong magnetic environment and lacks a protection design for coping with violent forcible entry, and consequently the anti-dismantling reliability and safety of the case are low are solved, and comprehensive monitoring of conventional opening and violent forcible entry of the case is achieved; and the technical effect of improving the safety and reliability of the key data of the case in various scenes is achieved.

This utility model discloses a conveyor belt packaging purging device, including an air tank, a pulse valve, a photoelectric switch, a purging pipeline, and a manual ball valve. The air tank is fixed to the side of the conveyor belt frame, and its outlet is connected to the pulse valve and the manual ball valve in sequence via flanges. The purging pipeline consists of two parallel annular sections mounted above the conveyor belt inlet, allowing for purging of both the top and bottom surfaces of the packaging. Its inlet end is connected to the outlet of the manual ball valve, and a directional, inclined nozzle array is welded to the bottom of the pipeline. The photoelectric switch is mounted 1m upstream of the starting end of the purging pipeline via an adjustable bracket, and its signal line is connected to the control end of the pulse valve. This utility model uses the air tank to stabilize and store compressed air, and in conjunction with the instantaneous opening of the pulse valve triggered by the photoelectric switch, ensures that the airflow is directionally sprayed only when the packaging passes through. This working mode reduces air consumption to one-third of that used for continuous purging, improving energy efficiency and avoiding interference from ineffective airflow on the conveyor belt environment.

The present invention relates to the technical field of coal flow detection, and more specifically to a coal flow switch signal detection device, comprising a mounting frame configured in a door shape and mounted on a bracket of a coal conveyor belt; a coal flow switch detection plate, one end of which is mounted on the upper door frame of the mounting frame and the other end of which extends above the coal conveyor belt and is provided with a roller; a photoelectric switch, mounted on one end of the coal flow switch detection plate near the upper door frame of the mounting frame, for determining whether coal flow is present based on the angle at which the coal flow switch detection plate deviates from the mounting frame; and a coal flow switch signal control unit for outputting a coal flow switch signal based on the coal flow switch signal emitted by the photoelectric switch. Using this coal flow switch signal detection device, accurate coal flow detection can be achieved in practical applications.

The application belongs to the technical field of spectral detection, and particularly relates to a light-weight LIBS online detection device and method with automatic focusing, wherein the device sequentially comprises a photoelectric switch, a pre-detection system, a controller, a delay timer, a pulse laser, a mirror, a zoom unit, an ellipsoidal mirror, a displacement adjustment platform, a transmission window sheet, a fiber coupling unit, a spectrometer and a signal strength detector according to a control logic and an optical propagation path. The application can easily realize zooming through the synchronous movement of the ellipsoidal mirror and the fiber coupling unit driven by the zoom lens and the displacement adjustment platform, can adapt to objects with different heights and shapes, solves the problem of large movement load in the zooming process, realizes light weight, and can judge the focusing range in advance through the telecentric lens imaging pre-detection system, so that the detection analysis efficiency is improved.