1561 results about "Gear pump" patented technology

The invention discloses an EHA drive control system three-closed-loop control system and a dynamic hysteresis compensation method. The technical problems that an existing electro-hydrostatic actuator is large in hydraulic hysteresis error, poor in dynamic response and insufficient in environmental adaptability are solved. The method comprises a three-stage control structure of a position control loop, a speed control loop and a current control loop, the position control loop introduces load disturbance feed-forward compensation based on a state observer, the speed control loop adopts an adaptive sliding mode control strategy, the current control loop executes a decoupling vector control algorithm, and the load disturbance feed-forward compensation is realized. And a dynamic hysteresis compensation model based on historical input and disturbance estimation is established in the controller. According to the system, the servo motor, the gear pump, the hydraulic cylinder and the sensor module are integrated into an integrated drive control structure, and the effects of improving the control precision, reducing the response time delay and correcting the hydraulic hysteresis error are achieved.

The utility model discloses a positive displacement gear lubricating pump which has the advantages of being simple in structure and capable of effectively reducing installation and machining requirements. The device comprises a driving motor, a pump seat, a mounting seat, an oil tank, a gear pump, an oil suction pipe and an oil outlet pipe, the pump seat is mounted above the oil tank and seals the oil tank, the mounting seat is mounted on the pump seat, the driving motor and the gear pump are mounted above and below the mounting seat respectively, and the driving motor is connected with the gear pump and drives the gear pump to operate. The gear pump is arranged in the oil tank, the first end of the oil suction pipe is communicated with an oil inlet of the gear pump, the second end of the oil suction pipe extends to the bottom of an inner cavity of the oil tank, and the first end of the oil outlet pipe is communicated with an oil outlet of the gear pump.

The invention discloses a gear defect detection system and method based on gear pump machining, and relates to the technical field of nondestructive testing. The gear defect detection platform is in communication connection with a magnetization preprocessing module, a magnetic signal acquisition module, a magnetic signal processing module, a gear defect analysis module and a defect visual labeling module, and all the modules are in electric signal connection; and the magnetization preprocessing module is used for customizing a magnetization scheme according to the material and structural characteristics of the gear. According to the method, the signal separation and feature extraction technology is adopted, independent features of different defect types can be effectively extracted from magnetic signals, the defect classification model is constructed, then surface damage, geometric deformation and fatigue cracks are accurately distinguished, quantitative analysis is conducted on the severity of the defects, the defect classification accuracy is improved, and the defect classification efficiency is improved. And classification errors caused by overlapping of magnetic signals in a traditional method are avoided.

The invention relates to the related technical field of torque detection, in particular to a gear pump output torque fluctuation online detection method and system.The method comprises the steps that operating parameters such as gear pump vibration acceleration are collected, threshold values such as the pressure change rate and a gear rotation vector are combined to draw up a characteristic matrix, and a torque pulsation mode is recognized; and configuring a fluctuation stability factor correlation model weight, determining a torque fluctuation grade and performing graded reminding. The method solves the technical problems that the characteristic change of early faults such as gear wear and cavitation is not sensitive, the torque fluctuation cause cannot be determined, the fault diagnosis is lack of depth, and the risk of sudden equipment faults is increased, realizes the accurate capture of a complex fluctuation mode, and determines the fault diagnosis accuracy according to a closed volume pressure change rate threshold and an unloading groove cavitation critical value. The technical effects that the gear pump closed volume pressure change, the unloading groove cavitation effect and the mechanical vibration cooperative influence are quantified, the torque fluctuation grade is determined through early-stage accurate recognition of faults, and graded reminding is conducted are achieved.

The invention relates to the technical field of logistics warehouse storage equipment, in particular to a speed reduction control method for a high-speed motor driven hydraulic system, which comprises the following steps: S1, the output torque of a high-speed motor is transmitted to a gear pump through a motor shaft, a planetary reducer and a planet carrier in sequence to drive the gear pump to work; s2, acquiring a three-phase current instantaneous signal and a direct current bus voltage signal, and performing preprocessing and frequency spectrum conversion to determine a current frequency spectrum; s3, in the current frequency spectrum, extracting an energy value in a preset frequency band with the meshing frequency and harmonic waves of the planetary gear as the center, and calculating to obtain a disturbance characterization value of the planetary gear; s4, determining a torque smooth adjustment coefficient according to the planet wheel disturbance characterization value; and S5, dynamically adjusting a dynamic response parameter of a torque control ring of the high-speed motor according to the torque smooth adjustment coefficient. The problems that in the prior art, a high-rotating-speed motor and a hydraulic pump are not matched in rotating speed, and mechanical disturbance is difficult to restrain are solved.

The invention discloses a blade system of a wind generating set, and belongs to the field of wind power generation systems. A hydraulic system drives a coaxial gear rigidly connected with the root of a main blade to provide power for a gear pump, hydraulic oil flow and speed are controlled by a hydraulic control element, and the hydraulic oil penetrates through the center of a main shaft through a double-channel rotary joint and reaches a blade motor at the top end of the main blade through an oil way laid on the inner surface of the main blade; and the blade motor drives the secondary blade module to rotate to form closed-loop energy supply. At low wind speed, the secondary blade module and the main blade rotate in the same direction, so that the aerodynamic efficiency is enhanced; at high wind speed, the secondary blade module and the main blade rotate reversely, reverse lift force is generated, and the tip bending moment of the blade is reduced. The core of the invention lies in that pneumatic coupling and hydraulic supply technologies are combined, so that not only is the application range of equipment to wind speed change widened, but also the utilization rate of wind energy is obviously improved. Revolutionary progress is brought to the field of wind power generation, and wide application prospects and market potential are shown.

The invention relates to the technical field of energy storage and heat dissipation, and discloses a centralized energy storage power station heat dissipation system. A data acquisition module of the system obtains historical operation data at different altitudes and generates a historical cooling parameter set; a feature analysis module extracts features from the features to obtain a historical feature parameter set, and a trend change feature matrix is established according to the historical feature parameter set; the pressure adjusting module constructs a pressure control space based on the matrix, and determines a feature early warning index set by calculating the parameter aggregation degree of historical abnormal events; the heat dissipation execution module extracts real-time characteristic parameters to establish state vectors, and calculates the position deviation degree between the state vectors and the early warning index set to generate real-time pressure regulation factors. The pressure adjusting module generates a pressure control model in combination with real-time adjusting factors, historical characteristic parameters and a trend matrix and outputs cooperative control parameters of the variable-frequency screw pump and the gear pump, precise adjustment of the working pressure of the cooling liquid is achieved, and efficient and stable operation of the energy storage power station is guaranteed.

The utility model belongs to the field of sheet jelly slurry spreading, and particularly relates to a stirring structure of a sheet jelly slurry spreading mechanism based on a gear pump, which comprises a gear pump 2, a slurry tank 3 arranged at a feed port of the gear pump 2 and a stirring mechanism 4, and the stirring mechanism 4 extends into a swinging deflector rod 46 into the slurry tank 3 for stirring. And the stirring mechanism extends a swinging deflector rod into the slurry tank for stirring, so that slurry at the periphery of the feeding hole is kept movable and not condensed on the plate surface, and meanwhile, a good inward slurry feeding effect is kept.

The utility model belongs to the field of sheet jelly slurry spreading, and particularly relates to a sheet jelly slurry spreading mechanism based on a gear pump, which comprises a gear pump 2, and a discharge plate 6 matched with a gear in the gear pump 2 in width is arranged at a discharge port of the gear pump 2. The flow is only related to the rotating speed of the gear pump and is easier to control, and the discharge plate matched with the width of the gear in the gear pump is arranged, so that the uniformity degree of the more accurately quantified slurry is kept after discharging, the thickness of the produced sheet jelly in the width direction is more uniform, and the more accurate quantification effect is achieved; and a pulp outlet mode is changed into a mode of naturally sliding down from the discharge hole for forming.

The invention discloses an aviation fuel gear pump confidence degree evaluation method based on the Bayesian theory. The method comprises the following steps: step 1, firstly, determining Weibull distribution as a theoretical basis of reliability modeling according to the life characteristics of the aviation fuel gear pump, and providing probability model support for subsequent analysis; 2, on the basis of Weibull distribution, adopting a Bayesian method to fuse historical data and field test data, and achieving point estimation and interval estimation of shape parameters and scale parameters of the aviation fuel gear pump; and step 3, based on the point estimation and the interval estimation, constructing an MTBF confidence interval and verifying by adopting a Bootstrap method, and finally completing quantitative evaluation of the reliability confidence of the aviation fuel gear pump. According to the method, the specific problems of low evaluation precision, poor confidence interval reliability and insufficient historical data utilization rate of a traditional method under the small sample condition are solved.

The invention discloses an aviation fuel gear pump service life estimation method based on gear failure, and relates to the technical field of gear pump service life estimation. Combining the smoke scattering spectrum, the gear material parameters and the Hertz contact theory to calculate the dynamic contact stress of the gear surface, and constructing a multi-physical field data set; extracting a polarization degree, a polarization angle, a stress change rate and a smoke concentration variable quantity from the multi-physical field data set to generate a node feature vector sequence; and fusing the dynamic graph embedded vector with the corrected Hertz contact item and Archard wear item to construct a physical constraint neural differential equation. According to the method, a corrected Hertz contact item and an Archard wear item are rigidly embedded into a neural differential equation, and a state evolution trajectory is iteratively generated by using a Dorman-Prince solver, so that the model is ensured to conform to a data driving rule and a physical conservation constraint at the same time.

The utility model discloses a drive rake with a gearbox oil air-cooled radiator, which comprises a drive rake and an air-cooled radiator, a portal frame is mounted on a casing of the drive rake through a lower hanger, a support plate is mounted at the rear end of the portal frame, the air-cooled radiator is mounted on the support plate, a gear pump is mounted on the casing of the drive rake, and the gear pump is mounted on the casing of the drive rake. The air cooling radiator, the gear pump and a gearbox of the driving rake are communicated with one another; and the gear pump is matched with a gearbox of the driving rake. By arranging the gear pump and matching the gear pump with the gear box of the driving rake through the gear, the driving of the gear pump can be realized on the premise that other external driving equipment is not needed. Due to the fact that the liquid paths of the gear pump, the gear box and the air cooling radiator are communicated, oil liquid circulation in the gear box can be achieved, and high-temperature oil liquid in the gear box can be actively cooled.

The embodiment of the invention discloses a gear pump shell topological optimization method and device based on an SIMP variable density method and a gear pump shell. The method comprises the steps that a three-dimensional model of the gear pump shell is established; performing statics analysis on the three-dimensional model to obtain stress and deformation distribution under different working conditions; taking the mass minimization of the shell as an objective function, taking stress and deformation distribution as constraint conditions, taking material distribution as a design variable, and adopting an SIMP variable density method to construct a topological optimization model; solving the topological optimization model to obtain optimized material distribution; and performing geometric reconstruction on the three-dimensional model based on the material distribution to obtain a reconstructed three-dimensional model. According to the scheme, material distribution is optimized through the SIMP variable density method, on the premise that the structural strength is guaranteed, the mass of the gear pump shell is greatly reduced, the stress distribution of the optimized shell is more uniform, and the structural stability and deformation resistance of the shell under the high-pressure working condition are remarkably improved.

A front cover and a rear cover are fixedly installed and define a cavity, a driving gear shaft and a driven gear shaft are installed in the cavity, a first gear on the driving gear shaft is meshed with a second gear on the driven gear shaft, and the two gears and the inner wall of the cavity define an oil suction cavity and an oil discharge cavity. The two floating side plates are arranged on the two sides of the two gears in a penetrating mode through the driving gear shaft and the driven gear shaft respectively, an ear-shaped high-pressure oil groove and an unloading groove are formed in the face, close to the gears, of each floating side plate, the ear-shaped high-pressure oil grooves are close to one side of the oil discharge cavity, the unloading grooves are close to one side of the oil suction cavity, and the two ends of the unloading grooves are communicated with through holes of the floating side plates respectively. An ear-shaped groove is formed in the face, away from the gear, of each floating side plate, and a compensation area is formed on the floating side plates around the ear-shaped grooves. And a radial gap is formed between the peripheral edge of the floating side plate and the inner wall of the cavity. The comprehensive performance of high pressure, large displacement, low noise and high efficiency of the bevel gear pump is improved.

The utility model relates to a gear pump with a built-in permanent magnet motor winding, which comprises a pump body, a pair of gears is arranged in the pump body, the gears are meshed with each other, the gears comprise a first gear and a second gear, the first gear and / or the second gear are / is provided with a mounting groove, the permanent magnet motor winding is mounted in the mounting groove, and the permanent magnet motor winding is arranged in the permanent magnet motor winding. The permanent magnet motor winding comprises a shaft body, a bearing, a stator core, a plurality of stator windings and a plurality of permanent magnets, the shaft body penetrates through the mounting groove and is fixed to the pump body, the first gear and / or the second gear are / is connected with the shaft body in a matched mode through the bearing, and the permanent magnets are tightly attached to the inner wall of the mounting groove. The stator windings are wound on the stator iron core, the shaft body is matched with the stator iron core to be installed in the installation groove, and the permanent magnets are located on the periphery of the stator windings.

The invention discloses an aviation fuel gear pump performance prediction method based on lumped parameters, which relates to the technical field of aviation hydraulic simulation, and comprises the following steps: dividing fluid working cavities according to the geometric structure of a fuel gear pump, defining the flow exchange relation and the pressure change relation among the fluid working cavities, and establishing a coupling calculation path; forming a basic prediction model; the method comprises the following steps: extracting a biofuel blending ratio and a water content parameter according to a fuel component parameter input in real time, comparing the biofuel blending ratio and the water content parameter with a preset blending ratio threshold to trigger a corresponding correction rule, generating a compensation coefficient, and generating an elastic modulus parameter in combination with the water content parameter and the compensation coefficient; and inputting a preset working condition parameter and an elastic modulus parameter into the basic prediction model, calculating mass flow exchange data through the flow exchange relationship, driving the pressure change relationship to solve, and outputting an initial pressure distribution vector. Through the elastic modulus parameter dynamic generation step, the problem of physical property parameter static correction distortion under the variable component working condition is solved.

The invention discloses a gear pump cavitation state recognition method based on a physical information neural network, and belongs to the technical field of fluid mechanical state monitoring. Comprising test data acquisition, feature analysis, theoretical flow calculation and cavitation identification. The method comprises the following steps: acquiring gear pump driving wheel rotation angle and flow data under multiple working conditions, and analyzing flow pulsation, time-frequency spectrum and flow pulsation and rotation angle information coupling characteristics under different cavitation states; theoretical flow is calculated, and the cavitation state is divided according to the actual-theoretical flow pulsation rate ratio; constructing a physical information neural network through a cavitation-free state, and embedding theoretical flow into a loss function to enhance the physical interpretability of the model; and after training is completed, the features of different working conditions are input into a neural network to calculate the predicted flow, residual curve features between the predicted flow and the actual flow are obtained, and the residual curve features are input into a support vector machine to achieve efficient classification of non-cavitation, primary cavitation, critical cavitation and serious cavitation. The method is simple in step, convenient to use and high in recognition precision.

The invention discloses a closed center multi-way valve with a converging function, a hydraulic system and a loading machine. An oil inlet P1 of the multi-way valve is sequentially connected with inlets of a bucket unit, a movable arm unit and a machine tool unit; the oil inlet P3 is connected with the control end of the first hydraulic control valve, an inlet of the first hydraulic control valve and an inlet of the first one-way valve. The outlet of the one-way valve I is connected with the outlet of the one-way valve III and the inlet of the machine; an inlet of the second hydraulic control valve is connected with a spring cavity of the first hydraulic control valve, the control end of the machine and tool joint compensator and the control end of the second hydraulic control valve, an outlet of the second hydraulic control valve is connected with an inlet of the second one-way valve, and an outlet of the second one-way valve is connected with the control end of the movable arm joint compensator and the control end of the bucket joint compensator. According to the hydraulic system combining the quantitative gear pump and the closed center multi-way valve, two options of standard flow and large flow can be achieved, under the condition that no action is carried out, confluent flow can normally return to an oil tank, and it can be guaranteed that the movable arm unit and the bucket unit work at the standard flow in the large-flow state.

The invention belongs to the technical field of lifting tools, and particularly discloses a lifting device oil way system, a lifting device, a jack, a pressing machine and a crane. The oil way system of the lifting device comprises a lifting oil cylinder, an oil tank, a first oil inlet way, a second oil inlet way and an oil return pipeline, the first oil inlet path is an oil inlet path of the gear pump assembly; and the second oil inlet path is an oil inlet path of the plunger pump assembly. When the lifting device is in the no-load or low-pressure condition, the gear pump assembly can rapidly pump in much hydraulic oil with small pressure so that the lifting device can rapidly ascend or descend, the defect that in the prior art, the displacement speed of a hydraulic lifting pump is low under the no-load or low-pressure condition is overcome, and the user experience is improved; when the hydraulic lifting pump is in a high-pressure condition, the plunger pump assembly can pump high-pressure hydraulic oil into the lifting oil cylinder so that the lifting oil cylinder can ascend or descend slowly, the lifting device can move slowly, and the normal use requirement of a user is met.

The disclosure discloses an oil circuit system, a lifting device, an electric jack, a press, a crane, and a tire mounting / dismounting and transport apparatus. The oil circuit system comprises a lifting oil cylinder, the tank, the first oil feed line, the second oil feed line, the oil inlet / outlet line, the pressure relief line, the oil return line, the first valve, the second valve; the first oil feed line is the gear pump assembly oil feed line; and the second oil feed line is the plunger pump assembly oil feed line. Under no-load or low-pressure conditions of the lifting device, the gear pump assembly can quickly pump a larger volume of low-pressure hydraulic oil, enabling quick lifting or lowering of the lifting device. Under high-pressure conditions, the plunger pump assembly can quickly pump higher pressure hydraulic oil to the lifting oil cylinder to enable slow lifting or lowering.

The invention discloses a sweet material atomization test platform material liquid feeding device, a control system and a control method. The device comprises a fragrant sugar feed liquid storage unit and a pipeline feeding system, a feed liquid tank body of the fragrant sugar feed liquid storage unit is communicated with a pipeline of the pipeline feeding system; the pneumatic stop valve, the density sensor, the viscometer and the gear pump are sequentially mounted on a liquid conveying pipe at the lower end of the sweet material liquid storage unit, the gear pump is connected with the spray head through the liquid conveying pipe, a flow controller is arranged on the liquid conveying pipe, and a return pipe is arranged at the upper ends of the liquid conveying pipe and the sweet material liquid storage unit; the control system comprises a control module and an operation adjusting module, the control module and the operation adjusting module are configured in a touch screen computer, and the touch screen computer is internally provided with a high-speed camera data interface and connected with the high-speed camera to collect the droplet particle size distribution state; the automation level of the device is improved, the research and development period is shortened, and the device has the application potential of expanding to other tobacco processing and research fields.

The invention discloses steam ablation equipment which comprises an industrial personal computer, a steam generator, a gear pump system based on PID self-regulation, a heat tracing pipe, a sensor, an upper computer and an electromagnetic valve. The temperature index of steam output is controlled, the steam outlet pressure is controlled, and it can be known through simulation that in steam ablation, the temperature and the outlet pressure have important influences on the ablation effect; in order to realize accurate control of air pressure, a gear pump system based on PID self-regulation is adopted to realize closed-loop control of air outlet pressure; in order to realize accurate temperature control, the steam generator is divided into a vaporizing chamber and a heating chamber; the air outlet pressure and the air outlet temperature can be set at will, and by matching with different steam outlet needles, the device can be applied to the field of steam ablation in various occasions, such as chronic obstructive pulmonary disease, prostate and tumor fields possibly involved in the future.

The utility model relates to the technical field of agricultural machinery, in particular to a multifunctional adjustable pesticide applying and spraying robot for plants. The robot comprises a spraying part and an adjusting part, the spraying part is used for spraying pesticide, and the adjusting part is used for adjusting the height or displacement of the spraying part; the spraying part comprises a holder used for plane supporting. According to the multifunctional adjustable pesticide spraying robot for the plants, through cooperation of the holder, the spraying mechanism, the liquid conveying mechanism, the pesticide storage mechanism, the adjusting mechanism, the moving mechanism and the guiding mechanism, the length of the spraying mechanism can be adjusted according to the pesticide spraying area, pesticide spraying can be accurately controlled in multiple directions, and the pesticide spraying efficiency is improved. According to crops with different heights, the holder and the spraying mechanism are driven to perform height adjustment through work of the adjusting mechanism, unnecessary pollution is avoided, and economic benefits are improved; and by arranging the gear pump, the self-suction characteristic can be optimized, and the conveying efficiency can be improved.

The present invention relates to the technical field of sampling in deep sea. Disclosed are an apparatus for collecting overlying water and a particulate matter of a cold seep, and a method for using same. A gear pump is started to pump overlying water and a particulate matter into a heating device, the overlying water and the particulate matter are heated and then flow into a water inlet of a switcher through a connecting guide pipe, a water outlet switching device in a default state enables the water inlet of the switcher to be communicated with the second water outlet of the switcher, and the overlying water and the particulate matter enter a sample storage container, so that in-situ collection and storage of the overlying water and the particulate matter are realized; when collection and storage are finished, a push rod motor contracts, the first water outlet of the switcher is communicated, and the overlying water and the particulate matter enter a sample filtering container, so that in-situ separation of the overlying water and the particulate matter is realized. The apparatus of the present invention is complete in function, and the collection apparatus can stably and efficiently collect the overlying water and the particulate matter of the cold seep, and can perform accurate oil bath heating, in-situ storage and in-situ separation on the overlying water and the particulate matter.

The utility model provides an oil pump with double oil inlets, which comprises a pump body, a driving gear and a driven gear, the pump body is provided with a pump cavity, a first oil inlet, a first oil inlet cavity, a second oil inlet, a second oil inlet cavity, an oil outlet cavity and an oil outlet, the driving gear and the driven gear are arranged in the pump cavity, the first oil inlet cavity corresponds to the driving gear, and the second oil inlet cavity corresponds to the second oil inlet cavity. The second oil inlet cavity corresponds to the driven gear; a spacing part is arranged between the first oil inlet cavity and the second oil inlet cavity, a first sealing surface is formed in the position, corresponding to the driving gear, of the spacing part, and a second sealing surface is formed in the position, corresponding to the driven gear, of the spacing part; the oil outlet cavity corresponds to the meshed position of the two gears, a third sealing face is formed in the position, corresponding to the driving gear, of the pump body part located between the first oil inlet cavity and the oil outlet cavity, and a fourth sealing face is formed in the position, corresponding to the driving gear, of the pump body part located between the second oil inlet cavity and the oil outlet cavity. According to the technical scheme, when one oil inlet sucks air, the other oil inlet can normally suck oil.

In one embodiment, an oral irrigator including a reservoir, a tip fluidly connected to the reservoir, a motor having a drive shaft, and a pump. The pump includes a pump body including a pump inlet fluidly connected to the reservoir and a pump outlet fluidly connected to the tip, a spiral pinion gear including a plurality of pinion gear teeth that curve along their length, and a spiral driven gear including a plurality of driven gear teeth that mesh with the pinion gear teeth. The pump also may include a connecting rod eccentrically connected to the driven gear and a piston and received within the pump body. Movement of the drive shaft causes the pinion gear to rotate, causing the driven gear to rotate, translating the connecting rod and moving the piston laterally within the pump body to pull fluid from the reservoir and push the fluid to the tip.

The utility model relates to a top-mounted power device for a pure electric dust suppression vehicle. The top-mounted power device comprises a chassis, and a tank body, a fog gun, a fan motor, a lifting oil cylinder, a slewing mechanism and a power assembly which are positioned on the chassis, the fan motor is used for driving fan blades in the fog gun to rotate; the power assembly comprises a double-head output motor, a gear pump, a water pump and a two-in-one controller, the front end of the double-head output motor is directly connected with the water pump, the water pump supplies water for road surface watering operation and spraying dust falling operation, and the rear end of the double-head output motor is directly connected with the gear pump; and the two-in-one controller is used for controlling the operation of the double-end output motor and the fan motor. Through optimization of a control system and integration of a power structure, a two-in-one controller is adopted to control all operation actions of loading, a double-end output motor is adopted to directly connect and drive a water pump and a hydraulic pump, redundant motors and controllers are omitted, wire harnesses are reduced, the weight of a vehicle is reduced, the effective volume of a tank body is increased, and cost is saved.

The invention relates to an extensometer returning device, an extensometer combination and a high-temperature strain measurement device, the high-temperature strain measurement device disclosed by the invention is equipped with the extensometer returning device, and the extensometer combination can slide on a guide rail according to requirements; the extensometer returning device is provided with a steering engine and a moving wheel, and the steering engine can be controlled to drive the moving wheel to slide on the longitudinal sliding rail; when the strain of the extensometer reaches the maximum value and the temperature exceeds a safety range, the extensometer returning device can release fixation according to a sensor signal and drive the steering engine to rotate reversely to drive the extensometer to be separated from the loading test device and reversely return to a starting point, so that the function of protecting a contact rod of the extensometer is achieved; the extensometer returning device is provided with a gear pump, and the maneuvering platform and the extensometer body are fixed on the guide rail through transmission of the connecting rod assembly, so that automatic separation of the extensometer and the sample is realized.

The hydraulic pump gear trepanning and assembling device comprises a fastening machine body, a hydraulic pump shell is placed at the top of the fastening machine body, a driving shaft and a driven shaft are arranged on the two sides of the interior of the hydraulic pump shell correspondingly, the outer surfaces of the driving shaft and the driven shaft are sleeved with gears, and the outer surfaces of the driving shaft and the driven shaft are both sleeved with fastening inner rings; according to the scheme, the positioning fixing piece slides on the top of the supporting rail, the interval between the two gears is adjusted, in addition, by rotating the steering rotary knob, steering of the gears and meshing between the two gears are facilitated, fastening of gear bolts is achieved, and the positioning fixing piece is convenient to use. The gear is installed and fastened, noise is detected through the noise sensor, then the meshing condition of the gear is judged, the installation position of the gear is adjusted in time, transmission noise caused by poor installation precision of the gear of the gear pump is avoided, and then the service life of the gear is prolonged.

To provide a thermal decomposition device that separates gas in either a thermal decomposition part or a residue discharging part which discharges residue from the thermal decomposition part more securely, by which a gas volume coexisting with residue can be reduced on a post-stage of the residue discharging part.SOLUTION: A thermal decomposition device 1 comprises: a thermal decomposition part 20 which receives and thermally decomposes raw resin; a thermally decomposed gas separation part A which separates thermally decomposed gas generated by thermal decomposition in the thermal decomposition part 20; a gas treatment part 100 which treats thermally decomposed gas sent through the thermally decomposed gas separation part A; and a residue discharging part 30 which discharges undecomposed residue generated in the thermal decomposition part 20. The residue discharging part 30 includes a gear pump (positive displacement pump) 60 which absorbs and ejects undecomposed residue from an outlet part 23f of the thermal decomposition part 20.SELECTED DRAWING: Figure 2