59 results about "Stroke tests" patented technology

The invention discloses a valve stroke testing system which is characterized in that the system comprises a tested valve, a valve rod stroke control mechanism, an air intake and exhaust control device and a detecting unit; the tested valve comprises a pneumatic actuating mechanism and a sensor unit, wherein the pneumatic actuating mechanism controls the air intake or air exhaust through a two-position three-way electromagnetic valve; the sensor unit is used for obtaining the related information of a valve rod; the valve rod stroke control mechanism is provided with a limit sleeve; the valve rod is provided with a limit stop which is used for limiting a part of stroke of the valve rod; the air intake and exhaust control device is communicated with a circumscribed instrument air tank through an air intake electromagnetic valve according to one way of a buffer tank; the other way of the air intake electromagnetic valve is communicated with an air exhaust electromagnetic valve; one way of the air intake electromagnetic valve is communicated with the two-position three-way electromagnetic valve through a manual valve; and the detecting unit is used for collecting detecting signals and providing control signals of the two-position three-way electromagnetic valve, the air exhaust electromagnetic valve and the air intake electromagnetic valve. the valve stroke testing system provided by the invention can be used for online or off-line test of the valve stroke, can be used for full stroke or partial stroke test for the valve, and can be applied to pneumatic-type interlocked valves without mounting intelligent positioning devices in all industries.

An ESP variable speed drive controller functions in conjunction with a safety logic solver, dedicated pressure sensors and a surface emergency isolation valve, or safety shut-off valve (SSV), to perform a full functional test of the complete wellhead flowline system. The method includes the step of using a plurality of pressure transmitters to monitor the flowline pressure during normal operations and during a full stroke test of the safety shutoff valve and adjusting the speed of the downhole ESP during the test to maintain the pipeline pressure within predetermined safe pressure limits. This wellhead flowline protection system and method utilizes the downhole ESP speed controller and an SSV to ensure that dangerous pressure levels are not reached and provides for full functional safety testing of the wellhead system. The ESP motor speed controller is used to permit functional testing and remove the pressure source from protected downstream flowline piping.

An actuating device for an on/off valve having a pneumatic drive that is connected to a compressed air supply by a solenoid valve, wherein when driven with a control voltage, the solenoid valve ventilates the pneumatic drive with the compressed air and, when the control voltage is not present, vents the pneumatic drive. The pneumatic drive moves the on/off valve into an operating position during ventilation and moves it into a safety position during venting. To permit the performance of partial-stroke tests in the simplest way possible, a device for performing the partial-stroke test includes a controllable switch which is closed in a quiescent state, and in this case supplies the control voltage to the solenoid valve. The controllable switch is opened by a control signal that is generated to perform the partial-stroke test. The control signal is supplied to the controllable switch by a position switch that is closed in the operating position of the on/off valve and is opened when the on/off valve reaches a predefined position in the direction of the safety position.

To generate a setpoint signal to stroke a valve during a partial-stroke test, a first target is determined for the setpoint signal based at least on a travel displacement threshold, the travel displacement threshold corresponding to a desired extent of travel of the valve during the partial-stroke test; the setpoint signal is ramped from an initial value to the first target, during a first time interval; subsequently to the first time interval, the setpoint signal is maintained at the first target during a second time interval; a second target is determined for the setpoint signal based at least on the initial value; and during a third time interval subsequent to the second interval, the setpoint signal is ramped from the first target to the second target in a direction opposite to the ramping of the setpoint signal during the first time interval.

The invention discloses an examinee score input method, device and system, and the method comprises the steps: firstly, collecting a two-dimensional code image corresponding to a current test paper, and searching the examination information of an examinee from a database server according to the two-dimensional code image; collecting score information on the current test paper, and associating thescore information with the examination information of the examinee; sending the associated score information as a target score to a database server, so that the database server stores the target score; and sending the target score to the examinee terminal logging in the examinee examination information, the examinee terminal sending a score confirmation instruction to the database server; when a database server receives a score confirmation instruction, sending the target score to the block chain platform, so that the block chain platform stores the target score, and finally the examinee terminal broadcasting the target score to each node in the blockchain platform, thereby solving the problems that a paper reader is inconvenient to record the stroke test score and is easy to make an error, and the recorded test score has potential safety hazards.

The present invention discloses a method for prevention of generation of power oscillation in a process of a main stop valve full-stroke test of a steam-turbine generation steam turbine. On the basisof the prior art, a determination module a and an alarm device are added to achieve removal of a power control loop, effectively prevent a unit from generating power fluctuation and power oscillationad emit an acousto-optic alarm after a steam turbine set is large in load deviation; a load deviation function is added to achieve that a high-pressure control valve can be switched on and off at variable speeds and reduce a small steam turbine load fluctuation amplitude; and a determination module b and a valve location manual input module are added to achieve a unit valve location maintenance function and a manual input valve location value function and effectively prevent the unit to generate power fluctuation and power oscillation. The method for prevention of generation of power oscillation in a main stop valve full-stroke test of a steam turbine provides a great guarantee for normal and smooth performing of the main stop valve full-stroke test of the steam turbine, and effectively reduces operators' burden.

An automobile pedal stroke testing device and method are provided. The automobile pedal stroke testing device comprises a pedal inclination testing device, a vehicle attitude testing device, a data line and a data acquisition and processing system. The automobile pedal stroke testing method specifically includes the following steps of: installing a test device, measuring acquired data and processing data. The automobile pedal stroke testing device realizes the accurate measurement of a pedal stroke, can be installed independently and carries out testing, and has simple structure, small size and high test precision.

The invention discloses a release bearing structure of a clutch and a release stroke test method of the clutch. The release bearing structure of the clutch comprises a release bearing, and a release bearing displacement measuring device is arranged on the release bearing. Through the release bearing displacement measuring device, the release stroke value can be measured without opening an observation hole of a gearbox, operation is convenient to perform, and measured data are accurate. Meanwhile, by monitoring the release stroke value, the abrasion conditions of friction plates of the clutch and the working conditions of a clutch slave cylinder can be judged, a prompt can be given according to whether the friction plates need to be replaced or not, and fault problems of a clutch system can be diagnosed conveniently, so that a reliable judgment basis is provided for fault problems of the clutch system, the difficulty in solving the fault problems is reduced, and convenience is provided for a driver.

The invention discloses a state feedback based fault diagnosis method for a hydraulic valve of a steam turbine. The state feedback based fault diagnosis method comprises the following steps: 1) testing a relationship curve which is named as a datum curve between hydraulic servo-motor force and valve rod stroke when the hydraulic valve is free of faults; 2) performing a valve opening and closing stroke test after a unit stops, accessing a hydraulic servo-motor force and valve rod stroke signal into an external diagnosis system, and testing the relationship curve which is named as a fault curvebetween hydraulic servo-motor force and valve rod stroke of a to-be-detected valve; and 3) comparing and analyzing the fault curve with the datum curve, detecting anomaly in an operation state of a valve rod, a valve rod lining sleeve and a spring, determining the valve state through the anomaly, predicting valve faults, and making a valve maintenance schedule according to a valve state condition.The state feedback based fault diagnosis method detects the anomaly in the operation state of the valve rod, the valve rod lining sleeve and the spring through feedback of the hydraulic servo-motor force and valve rod stroke curve, so that the valve state is determined through the anomaly to predict the valve faults.

Many operators choose not to utilise partial-stroke testing arrangements even when the equipment required for it to be performed is available, due to a perceived risk of over-travel and/or spurious trip. To alleviate this, we describe a safety valve system comprising a valve operable to move between an operating state and a safe state, a valve actuator operatively connected to the valve to control its state, and including a bias toward the safe state, a pair of drive members powered by a pressure media, each acting against the bias to urge the valve toward the operating state, a first control valve arranged to selectively convey pressure media to both drive members and to withdraw supply on receipt of a safety trigger, and a second control valve arranged to selectively convey pressure media to one drive member only of the pair and to withdraw supply on receipt of a test signal. In this way, a partial stroke test is possible via the second control valve, but the other drive member of the pair will remain active thus acting as a buffer that prevents excessive movement of the valve.

The invention relates to a full-automatic detection processing line, and belongs to the production field of electromagnetic switches of start motors. The full-automatic detection processing line comprises a middle control mechanism, as well as a transmission mechanism, an airtightness test box, a hook size test box, a switch cover direction confirmation mechanism, an additional stroke test box, a pull-in voltage test box, a release voltage test box, a coil current balance test box, a running-in test box, a measuring contact step-down and withstand voltage test box and an automatic ink jet box driven by the middle control mechanism; and the transmission mechanism comprises a cyclic feeding belt and a tool positioning platform arranged on the cyclic feeding belt. In the full-automatic detection processing line, the test boxes are arranged sequentially along the cyclic feeding belt, and during detection, the tool positioning platform is pushed manually and conveyed along the cyclic feeding belt, and undergoes different data detection successively; and via a processing line detection manner, the detection efficiency is improved greatly, the outgoing amount of an enterprise is increased, and the enterprise cost is reduced.

The invention provides a cheating detection method and device, terminal equipment and storage equipment, and relates to the technical field of remote control. The method comprises the steps that underthe condition that it is determined that a person to be examined starts to carry out a remote stroke test, judgment information is collected; whether a cheating condition is met or not is judged according to the judgment information; under the condition that the cheating condition is met, determining that the person to be examined has a cheating suspicion; wherein the judgment information comprises the image information of the person to be examined and/or the operation behavior of the browser adopted by the remote stroke test. Therefore, cheating judgment can be performed through combinationof the image information and the operation behavior of the browser, so that the effectiveness of a cheating behavior judgment result is improved, the cheating judgment operation is simplified, and thejudgment efficiency is improved.

The invention discloses a drum brake wearing clearance tracker and brake cylinder stroke test bed, which is mainly used for the performance test of a hydraulic drum brake wearing clearance tracker anda pneumatic brake cylinder stroke brake cylinder. The test bed is mainly formed by a machine base (1), a bearing frame (2), a displacement adjustment assembly (3), a test piece support (4) and a computer control system (5), and is characterized in that the test piece support (4) is arranged on the machine base (1); the bearing frame (2) is formed by two side vertical plates (6) and four guide pillars (7); and the displacement adjustment assembly (3) is mainly formed by a servo motor (8), a ball screw (10), tapered iron A (11), tapered iron B (12), a moving plate (13) and a displacement sensor(14).

A safety instrument system comprises a positioner for controlling the degree of opening of an emergency cutoff valve that is provided in a pipe in a plant, and a higher-level system for controlling the PSTs (partial stroke tests) of the emergency cutoff valve. The positioner has: a portion for executing a PST on the emergency cutoff valve in response to an initiating instruction from the higher-level system or to an initiating instruction from an operating panel on the plant floor wherein the positioner is provided; a timer for measuring elapsed time from the completion of a PST on the emergency cutoff valve; and a portion for evaluating whether or not a PST is permitted, by comparing elapsed time from the previous PST, to a PST minimum interval that is set in advance.

A contactor standby stroke test clamp comprises a base plate, a pillar, an upper plate, a nut, a threaded pressing block, a bearing, a baffle plate, a screw, a pressing block and a clamping screw, and the base plate and the upper plate are connected through the pillar and then are fixed into a stable whole through the nut; the threaded pressing block is installed in the center of the upper plate, the bearing is installed at the bottom of the threaded pressing block, and the baffle plate is fixed to the bottom of the threaded pressing block through the screw. The pressing block penetrates out of the baffle plate and then is connected with the bearing. The clamping screw is mounted on the base plate. The contactor standby stroke test clamp is simple in structure, convenient to operate and accurate in measurement.