286results about How to "Not easy to interfere" patented technology

The invention provides a bolt looseness detection device and method, and relates to the technical field of part detection, the device comprises a conductive fixing ring, the conductive fixing ring sleeves the outer side of a bolt, and the conductive fixing ring is provided with a contact boss; the rotating cap is arranged on a nut or a bolt column head, a conductive reed is arranged on the rotating cap, the conductive reed is in contact with the contact boss to form a detection circuit, and the detection circuit is used for being electrically connected with a detection assembly. A rotary cover and a conductive reed are arranged on a bolt column head / nut, and a conductive fixing ring is arranged on a fastened piece, so that a closed detection circuit can be formed by the conductive reed and the conductive fixing ring when a bolt is fastened; once the bolt is loosened, the conductive reed is driven to be separated from the conductive fixing ring, the detection circuit is immediately switched off, and the loosening condition of the bolt can be detected by monitoring the on-off state of the detection circuit.

The invention discloses a logistics positioning navigation system and method based on visible light communication. The system comprises a visible light transceiving array used for controlling an LED lamp to emit visible light carrying coded information of position information and service information; the navigation service module is used for processing the visible light with the coding information; the signal processing module is used for detecting the visible light with the coding information, calculating the initial position of the target cargo and correcting the initial position based on the processed visible light; and the path planning module is used for receiving the information of the signal processing module, displaying the position information of the target goods and planning a navigation path. According to the invention, the efficiency and accuracy of logistics operation are improved.

The invention relates to the field of descaling technologies, in particular to a variable-frequency electromagnetic-resistance descaling device which comprises a descaling device body. The electromagnetic coil comprises a first cable used for being wound to the outer side of the pipeline side by side; the fixing assemblies are arranged on the outer side wall of the pipeline, and one fixing assembly is arranged on each of the two sides of each electromagnetic coil and used for fixing the positions of the electromagnetic coils; the supporting seat is arranged on one side of the electromagnetic coil and connected to the fixing assembly; the telescopic tensioning mechanism is arranged between the first cable and the supporting base and used for being connected with the first cable and automatically exerting pulling force on the first cable to conduct tensioning treatment so that the first cable can be tightly attached to the side wall of the pipeline. The device has the effects that the cable wound on the side wall of the pipeline generates adaptive change after being influenced by temperature, the intensity of an electromagnetic field generated by the electromagnetic coil is kept uniform, the effect of removing a scale layer is enhanced, the energy consumption and the cost are reduced, and the operation stability of the descaling device is improved.

The invention provides an aero-engine vibration phase testing device. The aero-engine vibration phase testing device comprises an optical fiber sensor, a photoelectric converter, a triaxial accelerometer, a vibration analyzer and a test computer. The vibration analyzer is responsible for collecting signals and performing related processing on the signals through a built-in data processing module; and the test computer is connected with the vibration analyzer through the Ethernet to realize data real-time transmission and program end data processing, and is accessed to a test run data monitoring interface. The invention discloses an aero-engine vibration imbalance phase test method. The method comprises the following steps: marking key phase blades; preparation before installation of the optical fiber sensor; installing an optical fiber sensor; performing photoelectric conversion; a triaxial accelerometer is installed; picking up a rotor key phase positioning signal; solving a vibration imbalance phase under multiple rotating speeds; and carrying out counter weight adding test run verification. The method has the advantage that the unbalanced phase is efficiently and accurately obtained. The reliability and accuracy of vibration phase test data are improved, and the follow-up engine balancing quality is further improved.

The invention discloses a target bounding box detection system and method based on a millimeter wave radar, and the system comprises a point cloud data generation module which collects a millimeter wave intermediate frequency signal through the millimeter wave radar, and generates the point cloud data of a target; the data optimization module is used for removing noise in the point cloud data by using a reflection saliency coefficient and enhancing the point cloud by using a cumulative matrix; the frame detection module is used for carrying out receiving end beam forming on the millimeter wave intermediate frequency signal to obtain a target reflection energy spatial distribution map, fusing the target reflection energy spatial distribution map and the optimized point cloud data to obtain a fused multichannel feature map, and inputting the fused multichannel feature map into a two-dimensional contour prediction neural network to obtain a two-dimensional contour image of the target; and finally detecting a bounding box of the target in combination with the optimized point cloud data. According to the method, the applicability and reliability of target bounding box detection are improved, and the method can reliably work in various environments with poor light conditions by utilizing millimeter wave radar related algorithm design.

The invention relates to the technical field of tunnel construction, in particular to tunnel segment defect nondestructive testing equipment based on an impact echo method and a testing method.The testing equipment comprises a knocking detection device, the knocking detection device comprises a fixed mounting plate, a double-blade cam, a driver, a knocking rod, an energy storage part and a detection device, the fixed installation plate is installed on the carrying sliding platform in a sliding mode, the double-blade cam and the knocking rod are rotatably installed on the fixed installation plate, the first end of the knocking rod makes contact with the double-blade cam, the second end of the knocking rod is used for knocking a tunnel segment, and the driver drives the double-blade cam to rotate. The elastic piece is connected between the fixed mounting plate and one end, close to the double-blade cam, of the knocking rod, and the detection device is connected to the fixed mounting plate and is used for collecting sound wave signals. According to the invention, the technical problem that engineering application and accurate detection of internal defects of tunnel segments cannot be realized in the prior art is solved.

The invention discloses a quick-change device and an excavator in the technical field of excavators, and aims to solve the problems that in the prior art, a quick-change device is generally and directly mounted between a bucket and a bucket rod, the weight of the device is heavy, the cutting radius of the bucket is increased, the digging force of the bucket is reduced, and the performance of the whole machine is reduced accordingly. The quick-change bucket comprises a bucket rod and a bucket, one end of the bucket rod is provided with a quick-change support rotationally connected, the outer wall of the bucket rod is provided with a rocker rotationally connected, the same connecting rod mechanism is rotationally connected between the quick-change support and the rocker, and the same power mechanism is rotationally connected between the connecting rod mechanism and the bucket rod; the bucket is fixed through the first pin shaft and the second pin shaft on the connecting rod body, the cutting radius of the bucket is not increased, the excavating force of a standard product can be fully exerted, and the excavating performance of the whole machine is guaranteed; and on the other hand, when the excavator working device is completely retracted, the bucket is not prone to interfering with the movable arm lower sealing plate or the top of the excavator cab, and safety is improved.

The invention relates to the technical field of large-burial-depth metal pipeline positioning, in particular to a large-burial-depth metal pipeline positioning method and system based on electromagnetic method nondestructive detection, and the method comprises the following steps: S1, obtaining data and constructing a model: S1.1, obtaining magnetic field data when a pipeline leaks, carrying out the induction of the data, carrying out the subsequent analysis of the data, and constructing a detection model; s1.2, acquiring magnetic field data of the pipeline position, concluding the data, then analyzing the data, and constructing a calculation model; the device can meet the measurement of large-burial-depth pipelines smaller than 100 m, has high electromagnetic anti-interference capacity, can detect the accurate positions and burial depths of the pipelines, is suitable for close-distance same-ditch laying of multiple pipelines, is not prone to being interfered by nearby pipelines, is further suitable for measurement of pipelines in complex environments such as water areas and buildings above, and has wide application prospects. Meanwhile, measurement of underground optical cables and cables can be met, and the application range of the device is greatly widened.

The invention discloses a display panel and a display device. The display panel comprises a driving circuit; the driving circuit comprises N levels of shift register units which are cascaded with each other. In the same shift register unit, an initial control module is used for at least receiving an input signal and a first clock signal and controlling signals of a first initial node and a second initial node; the stage transmission output module is used for at least receiving a signal of a first initial node, a signal of a second initial node, a first level signal and a second level signal, and controlling a stage transmission signal; the driving control module is used for at least receiving a signal of a first initial node, a signal of a second initial node and a driving control signal, and controlling a signal of a first driving node; the driving output module is used for at least receiving a signal of a first driving node, a signal of a first initial node, a first level signal and a second level signal, and controlling a gate driving signal of a driving output node; the active auxiliary module is used for controlling a signal transmission path of the first level signal to the driving output node.

The invention discloses a quantum CNOT gate optical path structure. The quantum CNOT gate optical path structure comprises an input port array, a first beam splitter array, a first wavelength converter array, an on-chip wavelength division multiplexer, a transmission optical fiber, an on-chip wavelength division demultiplexer, a second wavelength converter array, a second beam splitter array and an output port array. The input port array is used for inputting control bit photons and target bit photons, the first beam splitter array and the second beam splitter array are used for running quantum CNOT gate operation, and the first wavelength converter array, the transmission optical fiber, the on-chip wavelength division / demultiplexer and the second wavelength converter array are used for recoding, transmitting and decoding quantum states. The quantum CNOT gate optical path structure is split, operated and re-coded / decoded, so that multi-chip cooperative operation quantum calculation is realized, the scale of the light quantum calculation chip is expanded, the calculation power is improved, and the optical path is stable in operation, easy to modulate and good in expandability.

The coupler assembly comprises an upper coupler and a lower coupler which are matched with each other, the bottom of a shell of the upper coupler is recessed upwards to form an accommodating cavity, a first row of pin groups and a second row of pin groups are arranged in the accommodating cavity, and the number of pins of the first row of pin groups is larger than that of pins of the second row of pin groups. The contact pins of the two rows of contact pin groups are distributed in a staggered mode to form a trapezoidal structure, wires connected with the contact pins of the second row of contact pin groups can penetrate through gaps between the contact pins of the first row of contact pin groups, and then the wires connected with the contact pins of the first row of contact pin groups extend out of the upper coupler shell on one side of the first row of contact pin groups together with the wires connected with the contact pins of the second row of contact pin groups. A wire connected with the pins of the second row of pin group can be connected with an electronic device on one side of the first row of pin group without being bent, and the phenomena of wire pressing and wire clamping easily occurring on the bent part of the wire in the coupler installation process are avoided. Without bending the lead, the probability of lead damage is reduced, and the service life of the lead is prolonged.

The invention belongs to the technical field of printed circuit boards, and relates to a buried resistor copper foil and a preparation method and application thereof. In the preparation of the buried resistance copper foil, the film with the window is selected to be attached to the upper surface and the lower surface of the copper foil, the copper foil with the resistance window is obtained through etching, then the resistance layer is directly and electrically deposited in the resistance window of the copper foil, and then the film is removed to obtain the buried resistance copper foil. The method can effectively reduce the resistance value difference of the unit area of each square resistance layer on the copper foil so as to improve the resistance value precision of the embedded resistance copper foil, and the preparation process is simple and easy to operate.

The invention discloses a relay, which comprises a shell, a magnetic circuit part, a contact part and a pushing part, and is characterized in that the magnetic circuit part is mounted on the shell and comprises at least two magnetic circuit units; the contact part is arranged on the shell and comprises a movable spring group, a static contact group and a load terminal; the movable spring groups and the static contact groups are arranged corresponding to the magnetic circuit unit, and each movable spring group is provided with a movable contact group corresponding to the static contact group; each movable spring group and the corresponding static contact group jointly form a switch; the movable spring group and the static contact group in each switch are respectively connected with different load terminals, and at least one load terminal is shared by at least two switches and forms a common terminal; and the pushing part comprises a pushing piece accommodated in the shell, the pushing piece and the magnetic circuit unit are correspondingly arranged, and the pushing piece is driven by the corresponding magnetic circuit part to drive the corresponding movable spring group, so that the movable contact group and the corresponding static contact group are closed or opened. By adopting the technical scheme, the occupied space is smaller than that in the prior art for realizing the functions of more than two switches.

The invention provides a human body behavior recognition method based on long-time-sequence motion semantic coding, and relates to the technical field of video analysis, and the method comprises the steps: S1, inputting a video image, detecting a pedestrian target in the image, and calculating the intersection-union ratio of pedestrian detection frames in a front frame image and a rear frame image to track the human body target; s2, extracting skeleton key points of each human body target by adopting a posture estimation algorithm, and defining the skeleton key points of the human body targets as middle-layer motion semantic features; s3, establishing a 3D CNN network model based on the middle-layer motion semantic features to extract short-time-sequence motion semantic codes; s4, constructing a long-time-sequence motion semantic coding model according to the short-time-sequence motion semantic coding so as to output a one-dimensional feature vector; s5, constructing a human body behavior classifier based on a full-connection network to recognize the one-dimensional feature vector, and outputting a recognition result; the accuracy of behavior recognition can be improved, and the problems that the error recognition rate is high, and application of a real scene is difficult to meet are effectively solved.

The utility model belongs to the technical field of machine tools, and particularly relates to a five-axis turn-milling machine tool. Which comprises a lathe bed provided with a first spindle component, a second spindle component, a swing head mechanism and a turret mechanism, and is characterized in that the first spindle component and the second spindle component are oppositely arranged and located on the same axis a, and the axis b of a cutterhead of the turret mechanism is perpendicular to the axis a. The tool turret mechanism has the advantages that the axis b of the tool turret mechanism is perpendicular to the axis a of the main shaft component, the tool turret mechanism faces a workpiece, the movable working space is enlarged, the first main shaft and the second main shaft which are wider can be selected, and adjacent tools are not prone to interfering with the first main shaft and the second main shaft during cutting.

The utility model discloses a deviation rectifying circuit applied to a lamination stacking machine. The rectification circuit comprises a first leakage protection switch unit, one side of which is connected with a phase line and a zero line. The other side of the first leakage protection switch unit is connected with one side of the first filtering fusing processing unit, one side of the second filtering fusing processing unit and the digital-analog socket unit in sequence; the other side of the first filtering fusing processing unit outputs constant current to the control circuit; the other side of the second filtering fusing processing unit outputs constant current to the power circuit; the control circuit outputs the constant current to the deviation rectification control system through a third switching power supply connected with the phase line and the zero line; and the interference problem is avoided.

The utility model discloses a hoisting feeding device and a feeding system, and relates to the field of feeding facilities, the hoisting feeding device is used for feeding to a feeding port, and the hoisting feeding device comprises at least two sets of track supports which are arranged at intervals along the arrangement track of the feeding port, the track support comprises a stand column used for being fixed to a building foundation and a mounting beam fixed to the stand column and extending to the position above a feeding port arrangement track. The hanger rail is arranged according to the arrangement track of a feeding port and is fixed on each mounting beam; and the walking hoisting mechanism is mounted on the hoisting rail and can hoist materials along the hoisting rail. A single-side supporting structure is formed through the rail support, the hanger rail and the walking hoisting mechanism are used as a hoisting and feeding execution body, compared with a traveling hoisting system, the overall structure is light, the requirements for bearing and the structure of the installation environment are low, interference with the surrounding environment is not likely to happen, and all-directional covering of all feeding ports is easy to achieve; and the application scene is wider.

The invention discloses a battery box and a battery pack, the battery box comprises a bottom plate, an enclosure frame and a partition beam assembly, the enclosure frame is arranged around the bottom plate, the enclosure frame is fixedly connected with the bottom plate, the bottom plate and the enclosure frame form a containing bin, the containing bin is used for placing a battery, the partition beam assembly comprises a first beam body, a second beam body and a first connecting part, the first beam body extends in the first direction, the second beam body extends in the second direction, a first included angle is formed between the first direction and the second direction, the first included angle ranges from 85 degrees to 95 degrees, the first direction and the second direction are parallel to the large face of the bottom plate, and the partition beam assembly divides the containing bin into a plurality of sub containing bins. The first connecting part comprises a first bottom plate part and two first side plate parts which are connected with each other, the first bottom plate part is fixedly connected with the first beam body in the second direction, the two first side plate parts are arranged at intervals in the first direction, the two first side plate parts are connected with the second beam body in the first direction, and the projection of the second beam body in the second direction covers the first bottom plate part.

The invention relates to the technical field of internet-of-things monitoring devices, in particular to a pipeline liquid level internet-of-things monitoring device based on a pressure sensor, which comprises a container, a placing box is arranged on the front side of the container, and the placing box can be adsorbed in front of the container through a sucker or hung in front of the container through a rope. The placing box is connected with a power plug, the container is connected with a pipeline, the pipeline is connected with a tee joint, a drying agent is placed in the storage box before the box cover is connected with the placing box, the drying agent is beneficial for preventing moisture from being generated in the placing box, and when the box cover is connected with the placing box, a pressing plate on the inner side of the box cover enters a groove, so that moisture is prevented from being generated in the placing box; the diameter of the pressing plate is one third of that of the groove, when the pressing plate enters the groove, the pressing plate presses the air bag, then a part of the air bag is extruded out of the groove, the extruded part is beneficial to filling a gap at the joint of the box cover and the placing box, and dust or moisture can be prevented from entering from the gap.

The invention provides a Bluetooth-based tire pressure management system controlled by a remote communication terminal. The Bluetooth-based tire pressure management system comprises a sensor, a controller and a receiver, the sensor is a Bluetooth tire pressure sensor which does not participate in network management, the receiver is a Bluetooth module on Tbox hardware, and the controller is a Tbox built-in chip; according to the system, the Tbox is used for replacing a traditional TPMS controller and a receiver, equivalently, one controller is saved, and the hardware cost of the whole vehicle is reduced; meanwhile, IDs of the Bluetooth tire pressure sensors are in one-to-one correspondence with vehicle tires and interact with a vehicle-mounted system, a driver can check corresponding information of the tires on an instrument panel or a vehicle machine display screen, when the tires are abnormal, the driver can be reminded, and the problem that in the prior art, the specific tires with faults cannot be accurately detected is solved; the safety of the vehicle is improved; the problems that a commercial vehicle is too long and wireless signals are not good are solved.

The utility model relates to the field of medical treatment, in particular to a balloon angiography catheter which comprises a catheter body and a balloon arranged at the far end of the catheter body, the balloon is a compliant balloon, and a catheter body at the far end of the catheter body is arranged to be a moldable shaping section. The catheter comprises an outer tube and an inner tube, the outer tube and the inner tube are coaxially arranged, a through cavity is formed between the outer tube and the inner tube, the far-end tip of the through cavity is a closed surface, the balloon is arranged on the outer tube, and a balloon cavity of the balloon is communicated with the through cavity, so that when gas is introduced into the through cavity, the balloon expands the through cavity to be used for injecting liquid or introducing a guide wire; due to the fact that the angiographic catheter is provided with the plurality of angiographic holes, even if the angiographic catheter is not well fixed to an ideal aorta angiographic position, contrast agents can be normally conveyed, PDA development is facilitated, part of the side holes are located on the pulmonary artery side of the arterial catheter, the contrast agents flowing out of the pulmonary artery holes are not prone to interfering with PDA development, and the angiographic catheter is convenient to use. The angiographic catheter is beneficial to PDA development.

The utility model discloses a novel stamping device which comprises a machine body, a stamping machine arranged above the machine body, a stamping workbench arranged on the machine body and capable of loading products, a conveying device capable of conveying the products to the stamping workbench, and an alignment device capable of pushing the products into the stamping workbench to be aligned. According to the automatic punching machine, the products are conveyed to the punching position of the punching workbench through the conveying device and the alignment device, feeding and punching of the products are achieved, after punching is conducted through the punching machine, the discharging device is adopted to enable the punching workbench to move downwards on the machine body and send out the products, and discharging of the products is achieved; the whole automation process does not need to be carried out manually, in the whole stamping process of the product, the sinking type discharging mode of the discharging device is adopted, interference with other devices is not likely to happen, and a production line is easily formed through cooperation with other equipment.

The utility model relates to a fare register with a button having a locking function, and belongs to the technical field of fare registers, the fare register comprises a fare register body and a button locking assembly, the fare register body is provided with an operation button, the side wall of the operation button is provided with a locking groove, and the button locking assembly is arranged in the locking groove. The button locking assembly comprises a locking plate which is installed on the fare register body in a sliding mode and is inserted into or separated from the locking groove to lock or unlock the operation button. The method and the device have the effect of reducing the risk of influencing the data of the fare register due to mistakenly touching the operation button.

The utility model discloses a glove box glove flange, including outer ring body, inner ring body and frame board, outer ring body one end has the extension section, and the extension section is used for extending into glove box inside, and inner ring body is screwed with the extension section, and the other end of outer ring body has the fixed cylinder, and the frame board is connected with outer ring body through the cushion block, and the frame board slidingly fits with the movable plate, and the movable plate has the sleeve body, and the sleeve body is provided with movable cylinder, and the movable cylinder outer wall is provided with a plurality of first elastic ring, and a plurality of first elastic ring is opposite with the sleeve body inner wall, and the movable cylinder has the terrace for installing rubber gloves, and the movable plate inboard is equipped with the elastic sealing layer, and the elastic sealing layer is opposite with the fixed cylinder front end, and the movable plate can move along the frame board vertical, is used for driving sleeve body and fixed cylinder butt joint or staggered, can dismount the replacement of rubber gloves, in the process of replacing gloves, effectively avoid glove box inside long -time direct exposure in the air, effectively reduce the entry of external dust and other impurities, make the experimental environment of glove box inside not easy dust interference.

This utility model relates to the field of snow-throwing machine technology, and more particularly to a snow-throwing tube structure and a snow-throwing robot. The snow-throwing tube structure includes a tube body, a guide shell, a rotary drive assembly, an outer volute cover, and an inner volute cover. The guide shell is rotatably connected to the tube body. The outer volute cover is mounted on the guide shell, and a first internal space is provided between the outer volute cover and the guide shell. The inner volute cover is mounted on the tube body, and a second internal space communicating with the first internal space is provided between the inner volute cover and the tube body. One end of the inner volute cover is slidably inserted into the first internal space. The rotary drive assembly is mounted on the tube body, located in the first and second internal spaces, and connected to the guide shell, for driving the guide shell to rotate relative to the tube body. In this utility model, the rotary drive assembly and other components are always located in the sealed first and second internal spaces, avoiding interference from the external environment. The inner and outer volute covers also provide insulation for the rotary drive assembly.

The invention belongs to the technical field of grouting reinforcement, and particularly relates to a shield synchronous grouting effect detection method and system based on an ultra wide band, and the method comprises the steps: obtaining an echo signal obtained after a lining surface is detected by an ultra wide band detection device, and carrying out the preprocessing of the echo signal, comprising the following steps: performing cumulative average processing on received echo signals within a set time range and a frequency range to obtain background estimation signals; subtracting the background estimation signal from the current echo signal to eliminate background noise; performing feature analysis on the preprocessed echo signal to obtain cavity data in the lining surface; and grouting parameters of the synchronous grouting device are adjusted in real time based on the cavity data. According to the method, the echo signals are processed by adopting an accumulated average background cancellation method, background noise or interference is separated from useful signals by performing background estimation on the received echo signals, the background interference can be effectively eliminated, and the detection precision of the wall cavity is improved.

The utility model discloses a tank body conveying mechanism which comprises a plurality of conveying structures used for enabling a tank body to move at a set speed, a feeding structure is arranged on the inlet side of one or more conveying structures, a plurality of positioning structures are correspondingly arranged on the conveying structures, and the conveying structures are divided by the positioning structures to form a plurality of retention intervals. And a plurality of tank bodies are closely arranged in the retention interval, and the feeding structure continuously acts to continuously feed the tank bodies of the previous conveying structure into the inlet side of the next conveying structure and drives the tank bodies in the next conveying structure to move in the process. The feeding structure can be arranged on the outer side of the conveying structure, so that transmission of the conveying structure is not prone to being interfered, on the other hand, the feeding structure can control the feeding frequency to a certain degree, and therefore material balance between different conveying structures is coordinated.

The utility model discloses a burner assembly which comprises a cavity with an opening in the top, an air injection plate, an air uniformizing plate, an air inlet and a flow guide plate. The air spraying plate and the air uniformizing plate are sequentially arranged in the cavity from top to bottom, and an inner cavity of the cavity is divided into a first chamber and a second chamber; the air injection plate is provided with a main nozzle and auxiliary nozzles located on the two sides of the main nozzle. Air uniformizing holes communicated with the main nozzle and the auxiliary nozzle are formed in the air uniformizing plate; the air inlet is formed in the bottom of the cavity and is communicated with the second cavity; the guide plate is arranged in the first cavity and divides the first cavity into a main air chamber communicated with the main nozzle and an auxiliary air chamber communicated with the auxiliary nozzle; the main air chamber is provided with a trapezoid structure, and the cross section area of the trapezoid structure is gradually decreased in the direction close to the main nozzle. Through the arrangement, the speed and the concentration ratio of premixed gas penetrating out of the main gas chamber to the outside of the main nozzle can be effectively improved, correspondingly, the purpose of improving the temperature and the concentration ratio of flames generated by the premixed gas can be achieved, and the applicability is higher.

The utility model relates to a kind of circuit board shielding structures of anti-electromagnetic interference, including mounting plate, shielding cover is equipped on the mounting plate, the end surface of the shielding cover is equipped with connecting plate, connecting plate is equipped with engaging piece on shielding cover, connecting plate is equipped with movable plate extending to the inside of shielding cover, the limiting assembly for being used to limit circuit board is equipped on the movable plate, the limiting assembly includes the two U-shaped covers of being oppositely arranged and being arranged on movable plate, the U-shaped cover is further equipped with abutment plate, spring is equipped between the abutment plate and U-shaped cover.The utility model is equipped with shielding cover cooperation mounting plate and connecting plate, can carry out all-round protection to circuit board, so that external electromagnetic is not easy to cause interference to circuit board, and by the limiting assembly set on movable plate, the fixing mode of circuit board becomes simple and convenient, without using any tool, circuit board can be easily taken out, effectively improve the convenience of later circuit board maintenance.

The utility model relates to a stirring device with a reciprocating screening mechanism, and belongs to the field of stirring devices.The stirring device comprises a stirring barrel and a screen, the screen slides in the stirring barrel in the horizontal direction, a plurality of feeding pipes are arranged on the stirring barrel, all the feeding pipes are opposite to the screen, a stirring shaft is rotationally connected into the stirring barrel, and the stirring shaft comprises a main shaft and an eccentric shaft; the spindle is rotatably connected into the stirring barrel, the eccentric shaft is eccentrically arranged relative to the spindle and connected with the spindle through the connecting shaft, the stirring paddle is arranged at one end, away from the eccentric shaft, of the spindle, and the eccentric shaft is connected with the screen through the connecting assembly. When the main shaft rotates, the eccentric shaft controls the connecting assembly to drive the screen to move in a reciprocating mode so that polyacrylamide fed from the feeding pipe can be evenly dispersed into the stirring barrel, the screen is located in the stirring barrel, the phenomenon that powdery polyacrylamide drifts around is reduced, and therefore the purity of glue-shaped polyacrylamide stirred by the stirring device is improved.