107 results about "Through transmission" patented technology

The invention discloses a snapshot type hyperspectral imaging industrial online sorting system which comprises a support assembly, an optical imaging assembly and a motion control assembly. The bracket assembly consists of a bottom plate, and an adjustable bracket and a fixed bracket which are fixed on the bottom plate; the optical imaging assembly comprises a lighting unit, an imaging objective lens and a snapshot type hyperspectral camera, and can synchronously obtain space image information of a measured object and spectral information of a continuous wave band in a single exposure process; the motion control assembly realizes automatic transmission of the measured object through the transmission platform; the data processing module is integrated with an image preprocessing unit, a spectral analysis unit and a spectral database, and is used for end-to-end closed-loop control from original hyperspectral data generation to sorting decision making; the system adopts a metasurface light splitting structure to realize real-time decoding, performs material or category identification by using a pre-trained classification model, and finally automatically generates a sorting decision signal according to an identification result to drive a motion control assembly to complete sorting operation.

The invention discloses an online nondestructive flaw detection instrument for producing a main shaft of a tanning machine and a use method thereof, belonging to the technical field of flaw detection instruments, comprising an electric guide rail of a support frame; an electric guide rail of a transmission mechanism, the electric guide rail of the transmission mechanism comprising a moving part and a rotating part, the moving part is arranged on the electric guide rail of the support frame, and the rotating part is arranged on the moving part; the electric guide rail of an electric telescopic rod is adjusted, and through the cooperation of the transmission mechanism and the flaw detection mechanism, the application of coupling agent, flaw detection inspection and cleaning of the coupling agent are integrated, and the coupling agent can be evenly applied to the surface of the main shaft body of the tanning machine, ensuring that the ultrasonic flaw detector can accurately receive and analyze the defect signal inside the main shaft, thereby improving the efficiency and accuracy of the detection, and at the same time also improving the overall production efficiency, and through the cooperation of the power component, the cleaning component and the self-cleaning component, the surface of the main shaft body of the tanning machine can be thoroughly cleaned immediately after the flaw detection is completed, which can reduce the demand for manual maintenance.

The invention relates to the technical field of cinema layout optimization, and discloses a layout optimization method and system for a wireless home cinema. The method comprises the following steps: scanning an indoor space by adopting an environment sensor to obtain space parameter data; spatial acoustic characteristic data are obtained through sound field simulation calculation; determining an optimal listening area of the panoramic sound system, calculating a theoretical layout position set, and distributing a 5.8 G wireless transmission channel for each sound channel loudspeaker; executing a wireless channel quality test, and screening out a qualified layout position set through a transmission performance evaluation function; inputting a sound field optimization model, and calculating an optimal layout coordinate of each sound channel loudspeaker; after sound channel loudspeakers are installed at the positions of the optimal layout coordinates, real-time acoustic signals are collected, time domain and frequency domain compensation is carried out on all sound channels through a staged signal processing algorithm, dynamic calibration of the panoramic sound system is completed, layout optimization of the wireless home theater is achieved, and self-adaptive calibration of the panoramic sound system is achieved.

The invention belongs to the technical field of ecological fishery engineering, and particularly discloses an artificial fish reef for fish sonar monitoring, which comprises a reef body, sonar equipment, buoys and a signal transceiver. The reef body is of a hollow polyhedral structure, the bottom of the reef body is opened to be inserted into seabed sediment to enhance stability, and the top and the side walls are provided with signal receiving and transmitting holes and hollowed-out parts used for receiving and transmitting sonar signals and promoting seawater circulation. The sonar equipment is fixed in a mounting groove in a central partition plate of the reef body and comprises a sonar placement cabin, a sonar transceiver, a transducer and a relay, wherein the sonar transceiver, the transducer and the relay are integrated in the sonar placement cabin. The buoy is connected with the sonar equipment and the signal transceiver through transmission lines to form an underwater detection-water surface transmission system; the signal transceiver integrates a 4G module and a solar power supply system, and supports data real-time return and self-powered operation and maintenance. The limitation that a traditional fish reef is single in function is broken through, the ecological restoration and intelligent monitoring capabilities are achieved, and a new solution is provided for marine ranch resource assessment and dynamic management.

The clamping device capable of effectively reducing the turning stress comprises a main body assembly, and the main body assembly comprises a support, an air inlet pipe, an air outlet pipe, a piston plate, a connecting column, a connecting ring, a first groove, a connecting rod, a rotating plate, a sliding groove, a clamping block, a guide rod and a second groove. The support is of a hollow structure, the outer side wall of the support communicates with an air inlet pipe and an air outlet pipe, and the inner side wall of the support is slidably connected with a piston plate. The air inlet pipe and the air outlet pipe are connected with an air source, compressed air is used for driving the piston plate to move, the clamping blocks are made to move through transmission of the connecting rods, the inner diameter of the clamp is adjusted, operation is easy, response is rapid, and the fixing efficiency of parts is improved. The main body assembly is fixed to the lathe, the ultrasonic assembly is arranged outside the main body assembly, high-energy sound beams generated by the ultrasonic transducer are used for restraining turning stress generated in the turning process, it is guaranteed that parts are stable, and the product quality is improved.

The invention discloses a spatial audio test method, which comprises the following steps: constructing a stereo microphone array, placing the stereo microphone array in a simulation head model, and placing a test earphone outside a simulation head ear canal of the simulation head model; the test earphone plays a spatial audio signal, the stereo microphone array collects the spatial audio signal, and the collected multi-channel spatial audio signal is sent to the main control system; the main control system carries out format conversion on the multi-channel spatial audio signal and transmits the multi-channel spatial audio signal to the host processing system through a USB, the host processing system processes the spatial audio signal after format conversion to obtain a compensated spatial audio signal, and then the compensated spatial audio signal is processed by using a positioning algorithm to obtain an audio signal; and obtaining a test result of the sound source corresponding to the spatial audio signal. The millimeter-level precision test of the earphone spatial audio is realized, the core challenge in the earphone spatial audio test is solved, and a golden standard test platform is provided for the development of a spatial audio algorithm.

The invention relates to the technical field of deformation monitoring, and discloses a deformation monitoring method based on near field communication. The method comprises the steps that S1, GNSS signals are received, at least three datum points are set on the ground of a monitoring area, and the datum points are distributed at representative positions of the monitoring area; s2, monitoring equipment points are measured and set according to the positions of the datum points; s3, the monitoring equipment transmits pulse signals and calculates the transmitting and receiving time periods of the signals; s4, calculating the distance between the monitoring equipment points; and S5, the monitoring equipment performs measurement to obtain a real-time measurement value and compares the real-time measurement value with a background value. By adopting the technical scheme that a dynamic resolving method is combined with a monitoring equipment point background value and a real-time measurement value, the technical effects of monitoring the position change of a monitoring point in real time and accurately judging the deformation amount and the direction are achieved. Compared with the technical scheme of a fixed monitoring method in the prior art, the defect that the deformation direction and trend in a dynamic change scene are inaccurately judged is overcome.

A thin-layer concrete terrace hollowing detection and marking device comprises a detection vehicle, a knocking hammer, a microphone, a sound signal collecting unit and an automatic spraying machine, and is characterized in that the detection vehicle is provided with a rectangular steel frame vehicle frame, the knocking hammer is used for detecting hollowing, the microphone is used for collecting sound, and the automatic spraying machine is connected with the sound signal collecting unit through a transmission line. A spraying machine control switch signal is transmitted to the automatic spraying machine, and sound collected by the microphone is transmitted to the sound oscilloscope through the sound transmission line; the sound oscilloscope is used for converting sound signals into different curves, and judging the non-hollowing terrace ground and the hollowing terrace ground by observing curve changes of different sounds; the hollowing detecting and marking device for the thin-layer concrete terrace has the advantages that the hollowing detecting and marking device is easy to manufacture and reliable to use, the hollowing position of the terrace can be visually and accurately recognized, and the construction efficiency of large-area hollowing detecting and marking is improved.

The invention discloses a dynamic sound field modulation and particle control method based on digital microfluidics, modulation of a sound field is achieved through liquid drops, the liquid drops are located between an upper pole plate and a lower pole plate, air is around the liquid drops, sound waves are located on the paths of the lower pole plate, the liquid drops and the upper pole plate, and due to the fact that the acoustic impedance difference between liquid and glass is not large, the sound field is modulated. Most of energy of sound waves can be transmitted through transmission, most of the energy of the sound waves is difficult to transmit due to the fact that acoustic impedance difference between air and glass is large and most of the energy of the sound waves is reflected at an interface of the air and the glass, the sound waves selectively penetrate at specific positions by controlling the number and arrangement of the liquid drops, so that a specific sound field is formed, and real-time movement of the liquid drops is controlled. The sound field formed by penetration is changed in real time, so that the dynamic modulation of the sound field is achieved, the sound field obtained by modulation acts on the solution, the specific movement of the particles is obtained through the sound field, the control of the particles is realized, and the application prospect in the aspects of micro-assembly and cell control is very good.

The invention provides a bolt pre-tightening force monitoring system and method based on multi-strain force acquisition, and the system comprises a plurality of foil strain gauges which are uniformly arranged at the end part of a bolt; the temperature compensation strain gauge is arranged at the center of the end part of the bolt; the signal processing part is in signal connection with the foil type strain gauges and the temperature compensation strain gauge; and the transmission part is electrically connected with the signal processing part. The pre-tightening force of the bolt can be monitored in real time, measurement errors are avoided, so that multi-dimensional strain information of the bolt can be obtained, the multi-dimensional strain information is processed through the signal processing component, more accurate strain information can be obtained, and the accuracy of the bolt is improved. The pre-tightening force dynamic change, caused by load change, vibration relaxation and the like, of the bolt is accurately captured, and the pre-tightening force change can be transmitted through the transmission component, so that a worker can monitor and know the bolt strain condition in real time.

The invention relates to the technical field of GIS equipment, and discloses a GIS equipment internal defect positioning device which comprises a detection sensor, the front end of the detection sensor is fixedly connected with a transmission line, the front end of the transmission line is fixedly connected with a comprehensive diagnosis device, a lower guide rail is arranged below the detection sensor, and the lower guide rail is fixedly connected with the comprehensive diagnosis device. According to the GIS equipment defect detection device, the detection sensor can monitor and collect changes of temperature, vibration, ultrasonic waves and electromagnetic waves of GIS equipment and transmit signals to the comprehensive diagnosis device through the transmission line for analysis and diagnosis, so that defects generated in the GIS equipment are detected; the I-shaped upper sliding block and the I-shaped lower sliding block clamp the detection sensors, so that the multiple groups of detection sensors can be attached to the GIS equipment at the same time and perform data acquisition on different parts of the equipment, and the specific part of the internal defect of the GIS equipment can be positioned according to the signal change intensity of the different parts of the equipment.

According to the conveyor belt capable of dissipating heat, after being welded, a radar is conveyed to an air tightness detection station through the conveyor belt to be subjected to air tightness detection, the radar which is just welded carries a large amount of heat due to the fact that the radar is affected by welding, and due to the fact that the conveyor belt is provided with a plurality of heat dissipation holes, the heat dissipation efficiency is greatly improved. The heat dissipation holes can help ventilation of the upper portion and the lower portion of the radar, heat dissipation of the radar is achieved, when the radar with the temperature is conveyed to the position above the heat dissipation fan, the heat dissipation fan blows air to the radar, the radar with the temperature is further cooled under the action of the heat dissipation fan, and when the radar is conveyed to an air tightness detection station, the temperature is reduced, and the radar is cooled. The transmission belt helps the welded radar to be cooled so as to eliminate inaccurate airtightness test caused by high temperature.

A post-processing apparatus includes a blade, a transfer mechanism, a sheet folding roller pair, a motor, a drive control device, and a control device. The blade presses into the sheet to form a fold line in the sheet. The transfer mechanism moves the blade toward and away from the sheet. The sheet folding roller pair conveys the sheet with the fold line formed by the blade by pinching the sheet at a nip between the sheet folding roller pair. The motor rotatively drives the sheet folding roller pair. The drive control device controls drive of the motor. The control includes a control circuit. When, through the processor executing a control program, the control device controls the transfer mechanism to withdraw from the nip the blade having been pressed into the sheet and the nip by the transfer mechanism, the control device controls the drive control device to stop the motor.

An imaging device capable of reducing the capacitance of a transfer gate electrode is provided. The imaging device includes a first substrate and a plurality of pixels provided in the first substrate. Each of the plurality of pixels includes a photoelectric conversion portion provided in the first substrate, a charge storage portion provided in the first substrate, and a transfer transistor provided on a first surface side of the first substrate to transfer charges from the photoelectric conversion portion to the charge storage portion. The transfer transistor includes a transfer gate electrode provided on the first surface of the first substrate via an insulating film interposed between the transfer gate electrode and the first surface. The insulating film includes a first insulating film located on a channel region formed on the first substrate, and a second insulating film located on a region other than the channel region on the first substrate. The second insulating film is thicker than the first insulating film.

The utility model discloses multifunctional fire operation monitoring equipment which comprises a shell, a gas monitoring module, a transmission module, a controller and a buzzer are respectively arranged in the shell, and a video acquisition module is arranged on the surface of the shell. The gas monitoring module and the video acquisition module transmit fire signals to the controller through the transmission module, and the controller sends an instruction to control the buzzer to give an alarm. According to the utility model, the gas monitoring module is arranged to detect the gas concentration of a fire scene, when the gas concentration exceeds a preset value, the gas monitoring module sends a signal to the controller through the transmission module, and the video acquisition module is arranged to acquire the image of the fire scene, so that when a fire occurs, the fire scene is monitored. Image signals are transmitted to the controller through the transmission module, and the buzzer is controlled to start to give an alarm by arranging the controller, so that the multifunctional fire operation monitoring equipment has the effects of gas concentration monitoring and video monitoring.

The invention discloses an interface loudspeaking structure, a charging box and an earphone device, and relates to the technical field of electronic equipment, and the interface loudspeaking structure comprises an interface assembly and a loudspeaking assembly. The interface assembly comprises a USB hole and a USB female seat; the plugging end of the USB female seat extends into the USB hole, and a gap hole is formed between the plugging end and the USB hole. The loudspeaking assembly comprises a transmission channel, a sound inlet hole and a loudspeaker; the sounding end of the loudspeaker is communicated with the sound inlet hole; the sound inlet hole is communicated with the gap hole through the transmission channel. By means of the design, the USB hole has the charging function and the sounding function creatively, and the manufacturing cost and the structural complexity of the charging box are effectively reduced; moreover, the dustproof and waterproof performance of the charging box is improved, and the service life is effectively prolonged.

The invention discloses a reflection amplitude characteristic matched simple calibration-free dielectric constant measurement method, which comprises the following steps of: outputting a continuous wave with continuously changing frequency through a signal generator, enabling the continuous wave to enter a rectangular waveguide in which a sample to be measured is placed through a power divider, and enabling the sample to be measured and an electromagnetic field to interact to generate a reflection signal; the reflected signals are transmitted to a detector after passing through a power divider, the reflected signals are collected, and a reflection amplitude actual measurement curve is obtained; a reflection amplitude theoretical curve is generated through the NRW transmission theory based on the dispersion model, curve matching optimization is conducted through a search algorithm, the Euclidean distance between a reflection amplitude actual measurement curve and the reflection amplitude theoretical curve is calculated iteratively, and an optimal parameter combination is obtained; and substituting the optimal parameter combination into the dispersion model to obtain the dielectric constant of the tested sample.

The utility model relates to the technical field of lane monitoring equipment, and discloses monitoring equipment for an intelligent distribution device based on a variable lane. The convenient maintenance mechanism is arranged on the cross beam, and the convenient maintenance mechanism is used for facilitating safety maintenance work of a user; and the stable clamping mechanism is arranged on the convenient maintenance mechanism, and the stable clamping mechanism is used for improving the stability of shooting. Through the overall design of the convenient maintenance mechanism, the stepping motor is controlled to work, the rotating disc can be driven to rotate, and through transmission of the first connecting rod, the overall connecting cylinder, the second connecting rod and the connecting frame, the camera body can be driven to rotate with the rotating disc as the circle center, so that the camera body tends to move on the ground; and the user can maintain the camera main body on the ground, climbing maintenance is not needed, and the safety and efficiency of maintenance work are improved.

A diagnostic site determination unit receives a plurality of ultrasound images successively acquired through transmission and reception of ultrasonic waves and determines a diagnostic site represented by each of the plurality of ultrasound images. An examination situation determination unit determines a situation of an examination using the ultrasonic waves based on a temporal change in a degree of certainty of the determination of the diagnostic site.

The invention relates to a method for measuring effluent levels in a wastewater network using a connected ultrasonic sensor, comprising a step of performing a plurality of measurements by transmitting and receiving ultrasound waves. Each measurement is induced by a triplet of parameters (time window, pulse train energy level, and detection ramp profile) allowing exploration of a target echo detection space. Each measurement is configured with a time window, a pulse train energy level, and a detection ramp profile. A criterion for selecting the measurement is based on the maximum distance that maximizes the signal-to-noise ratio. The invention also relates to a system for measuring effluent levels in a wastewater network, said system comprising a connected ultrasonic sensor. (Shorthand figure: Figure 3.)

The utility model discloses a gear transmission sounding pipe dredging device. The gear transmission sounding pipe dredging device comprises a supporting frame body, a drilling device frame body and a conveying device frame body. The supporting frame body is fixed to an area to be constructed, the drilling device frame body is arranged on the supporting frame body, and two rack rails are oppositely arranged on the inner side of the drilling device frame body. The transmission device frame body is movably fixed on the drilling device frame body and is meshed with the rack track through transmission gears arranged at the two ends of the transmission device frame body; a drill rod transmission device, a torque output device and a drill rod joint are arranged on the transmission device frame body, the drill rod transmission device is in transmission connection with the torque output device through a belt transmission structure, and the torque output device is in rigid connection with the drill rod joint; the bottom end of the drill rod connector is connected with a plurality of drill rods used for dredging the sounding pipe. And through the structural arrangement of the sounding pipe dredging device, the stability of the device is improved, and object strike accidents caused by failure and falling of the device are effectively prevented.

According to one embodiment, an apparatus includes processing circuitry. The processing circuitry acquires output data from a trained model by entering examination data acquired at an examination, the examination data corresponding to first data, the output data corresponding to second data, into the trained model configured to, based on the first data acquired through transmission of an ultrasound wave for a first number of times, output the second data acquired through transmission of an ultrasound wave for a second number of times that is greater than the first number of times.

The invention discloses an online monitoring method and system for water leakage of a water source pipeline of an extra-high voltage converter station. The method comprises the steps that ultrasonic flowmeters are arranged at a first monitoring point and a second monitoring point of the water source pipeline of the extra-high voltage converter station respectively; the water consumption W1 and the water consumption W2 of the first monitoring point and the second monitoring point are calculated through the ultrasonic flow meter based on a time difference method, and the water consumption W1 and the water consumption W2 are transmitted to a monitoring cloud platform through 5G; calculating a water consumption difference value delta W of the first monitoring point and the second monitoring point through the monitoring cloud platform based on the water consumption W1 and the water consumption W2; and judging whether the water source pipeline of the extra-high voltage converter station leaks water or not through the monitoring cloud platform based on the water consumption difference value delta W and a set alarm fixed value K. According to the technical scheme, the difference value of the water consumption of an outlet of a pump room outside the station and an inlet in the station within 24 hours is calculated in real time through a time difference method, the water leakage amount of the pipeline is dynamically judged, and the function of timely finding out potential safety hazards of a water source outside the extra-high voltage converter station is achieved.

The underwater wiper camera provided by the application comprises an underwater camera, a transmission cable and a display device; the underwater camera is connected with the display device through the transmission cable; the cable is a twisted pair cable for signal transmission, and has good stability, strong anti-interference performance and high transmission speed in actual application; the cable sheath is made of imported polyurethane, has high corrosion resistance and can be used in a special seawater environment; a wiper assembly is used for cleaning the protective lens, can effectively and continuously keep the lens clean; the protective lens covers and seals the first end portion; the shooting direction of the camera is towards the protective lens; an LED lamp assembly surrounds the camera shooting end periphery, and is located in the shell; the camera is connected with the display device through the transmission cable. The underwater wiper camera provided by the embodiment of the application adopts mechanical rigid sealing, has compact structure and good sealing.

A device for the generation of ultrashort pulses, wherein an oscillator is formed by: a first and a second non-overlapping transmission band-pass filter, which can serve as reflecting end element of the oscillator; optically transparent means with non-linear Kerr coefficient χ(3) different from zero configured to achieve a spectral broadening by self-phase modulation of the signal transiting through these means; an optical waveguide that produces a positive gain; a node configured to receive a trigger signal designed to activate the operation of the oscillator; a trigger signal generating device comprising: a laser source, for example a microchip, configured to generate a laser pulse, preferably with a minimum bandwidth, having a duration of hundreds of ps, up to the ns; a coupling system designed to introduce the pulse of the trigger laser into a waveguide made of an optically transparent material characterised by a non-linear Kerr coefficient χ(3) different from zero, which is configured to produce two distinct effects in order to spectrally broaden the pulse of the trigger laser, and precisely: a) self-phase modulation four-wave mixing; the output of the waveguide supplies the trigger signal to the node. The pulses produced by the oscillator typically have a duration of the order of the picosecond and are easily reduced to the Fourier limit of circa 100 femtoseconds by means of a dispersive device.

Surface meteorological drone dedicated to meteorological observation characterized in that it comprises: - A meteorological radar (1) X band (type "airborne or maritime meteorological") or S, L band ("terrestrial meteorological" type) with or without pulse compression, but with Doppler processing to eliminate parasitic echoes. - A radar antenna which is fixed to a toothed crown associated with a servo for roll stabilization (2). - The whole is enclosed under a radome (3) made of composite permeable to radio frequency. - The radome is fixed to the mast of the drone by means of a transmission system (4) which allows a servo on the yaw axis (Z). Figure to be published with the abstract: figure 1.

A sound insulator includes the space forming portion which have an introduction portion that forms a transmission space for transmitting sound waves and introduces sound waves into the transmission space and a discharge portion for guiding the sound waves introduced into the transmission space to the outside of the transmission space. The sound insulator includes a phase adjustment portion that attenuates sound waves corresponding to the frequency of the sound waves whose phases have been changed among the sound waves transmitted through the transmission space by changing the phase of some of the sound waves transmitted through the transmission space. The phase adjustment portion changes the frequency band of the sound wave whose phase is to be changed.

A sonar method and assembly for detecting and / or determining the position and / or speed of objects underwater and / or on the water in a specified region. The orthogonality of Doppler-shifted transmission sequences is explored. First, a transmission sequence is generated, spread for some possible Doppler shifts and output via the transmission elements. If the transmission sequence is chosen carefully, the spread versions become orthogonal to each other and enable MIMO signal processing. If one of the assumed spreads matches the speed of the object, the spread is canceled out again to form the original transmission signal. This allows the binary detection of the presence of an object with the correlation of only one sequence and reduces the computing effort at the respective receivers enormously.

The application discloses a kind of orthogonal circular polarization high-efficiency transceiver isolation radar systems and design method, belong to radar system technical field.The system, transmitter module is used to the signal to be transmitted is amplified, and is passed to antenna module by transmission waveguide;Receiver module is used to the signal received is amplified processing, while providing overload protection;Antenna module includes the double waveguide ladder diaphragm circular polarizer and horn antenna connected in turn, wherein the double waveguide ladder diaphragm circular polarizer is used to the linear polarized signal sent by transmitter module is converted into circular polarized signal, the horn antenna is used to circular polarized signal is radiated to the specified direction of space, while receiving target scattering signal and feedback to receiver module.The application significantly reduces the loss and risk brought by isolator, improves the aliasing phenomenon of ordinary linear polarization image dihedral angle and trihedral angle, relieves over-bright spot effect, improves image interpretation effect, can adapt to different polarization orientation angle.

The utility model discloses a water level measuring device which comprises an installation frame, an extension frame is connected to the installation frame in a sliding and clamping mode, a first rotating shaft and a second rotating shaft are connected to the installation frame in a rotating mode, a large gear is installed on the first rotating shaft, a first small gear and a second small gear are installed on the second rotating shaft, and a first rack is installed on the extension frame. The large gear and the first small gear are both in meshed connection with the first rack, and a mounting base is slidably clamped in the extension frame. Through cooperative arrangement of a large gear and a second small gear, on the premise that the large gear drives a first rack to stretch out an extension frame, the second small gear drives a second rack to stretch an ultrasonic water level gauge installed on the extension frame as well through transmission, and the ultrasonic water level gauge and the second rack stretch, so that the detection range of the ultrasonic water level gauge is increased; the ultrasonic water level gauge can be directly inserted into the cross-shaped clamping groove through the I-shaped block and clamped by the clamping block through the matched arrangement of the clamping block and the pull rod, and when the ultrasonic water level gauge is taken down, the ultrasonic water level gauge can be taken out by directly pulling the pull rod.