1592 results about "Plunger pump" patented technology

The present application discloses a coaxially integrated servo motor pump with integrated drive control functions, comprising a motor pump housing, a controller housing, and an electrical connector. The motor pump housing is provided with a blind hole, a first cavity for accommodating a plunger pump assembly, and a second cavity for accommodating a servo motor assembly, wherein the plunger pump assembly and the servo motor assembly are connected via a rotating shaft. The controller housing is connected to one end of the motor pump housing, and a drive controller is provided within the controller housing. The blind hole communicates with the second cavity, and the electrical connector is sealed and connected to the blind hole, and the electrical connector is electrically connected to the servo motor assembly and the drive controller. The distribution plate and the sealing assembly are respectively sealed with both ends of the motor pump housing. Cooling is achieved through a cooling oil channel, which connects from one end of the motor pump housing near the plunger pump assembly to the second cavity and then divides into two paths, one path passing through the center of the rotating shaft, and the other path connecting to the first cavity and passing through the distribution plate. The coaxial integration of the drive control functions is achieved, and the cooling effect is good.

The invention discloses a corrosion-resistant radial plunger pump with a self-cleaning function, and relates to the technical field of radial plunger pumps, the corrosion-resistant radial plunger pump comprises a shell of a hollow structure, a vertically-arranged partition plate is fixed to the center of the interior of the shell in the length direction of the partition plate, and the length direction of the partition plate is perpendicular to the length direction of the shell; the partition plate divides the interior of the shell into two cavities, and the drainage plate is rotationally connected to one end, in the length direction of the partition plate, of the partition plate; according to the device, through cooperation of the drainage mechanism, the driving mechanism, the filter screens and other components, when the filter screen on one side is blocked, the filter screens generate displacement under the action of negative pressure suction, then the drainage plate is driven to turn, switching of the flowing direction of liquid flow is achieved, the blocked filter screen can be cleaned, the conveying work cannot be stopped, manual intervention is not needed in the process, and the working efficiency is improved. And shutdown operation is not needed, so that the production interruption time caused by blockage of the filter screen is shortened, the production efficiency is improved, and the maintenance frequency is reduced.

A packing assembly to be disposed within a stuffing box defined by a fluid end of a body of a reciprocating plunger pump includes an elastomeric component and a wear component. The elastomeric component has an at least partially tapered inner diameter and an outer diameter and, in use, engages the stuffing box on the outer diameter and is axially compressed within the stuffing box. The wear component sealably engaging the elastomeric component across the at least partially tapered inner diameter and dynamically contacts the plunger to form a dynamic seal.

The invention provides an ultrahigh-pressure vertical plunger pump. The ultrahigh-pressure vertical plunger pump comprises a plunger pump base, a plunger pump body and a plunger pump cover. A transmission structure is arranged on the inner side of the plunger pump base, a receding hole communicated with an inner cavity of the plunger pump base is formed in the upper end of the plunger pump base, and the output end of the transmission structure extends into the receding hole. A water inlet hole is formed in the side wall of the plunger pump body, a high-pressure cylinder is arranged on the inner side of the plunger pump body, a water passing hole is formed in the side wall of the upper end of the high-pressure cylinder, a sealing bush is arranged in the high-pressure cylinder, a plunger shaft is slidably arranged on the inner side of the sealing bush, and the lower end of the plunger shaft is connected with the power output end of the transmission structure. An annular lubricating gap is formed between the sealing bush and the plunger shaft; a drainage channel is arranged on the inner side of the plunger pump cover, and a one-way valve structure is arranged at the joint of a water inlet of the drainage channel and an inner cavity in the upper end of the high-pressure cylinder. Compared with a sealing ring, the sealing bush has higher strength and higher wear resistance, and is not easy to wear in the use process.

The invention relates to the technical field of injection molding machine hydraulic control, in particular to an injection molding machine hydraulic pump control system and a control method thereof, and aims to solve the problems of high energy consumption, high cost or poor temperature control of a traditional hydraulic scheme. The system comprises a hydraulic oil tank, a driving unit and an oil way control module. The driving unit comprises a driving motor, and a fixed displacement pump and a plurality of swash plate type variable displacement piston pumps which are driven by the driving motor, and swash plates of the variable displacement pumps can be switched between negative and positive angles so as to adjust the displacement or actively suck oil; the oil way control module is provided with a flow collecting valve set capable of switching flow collecting / independent states of oil outlet ways of the constant displacement pump and the variable displacement pump, the integrated cooling unit forms an independent cooling filtering loop, the temperature and pressure adjusting assembly is combined with a temperature sensor to control temperature and adjust pressure, and the pressure limiting protection valve set is connected with the constant displacement pump and the variable displacement pump. And the pressure limiting protection valve is matched with a pressure sensor to realize overpressure protection. According to the invention, cost and energy saving are both considered, precise temperature control and pressure protection are realized, and system stability and plastic part forming precision are improved.

The invention relates to the technical field of mechanical hydraulic pressure, in particular to a low-pulsation plunger pump with a dynamic variable flow distribution pre-compression angle, the low-pulsation plunger pump with the dynamic variable flow distribution pre-compression angle comprises a plunger pump, a shell and an adjusting piece, the plunger pump is fixedly connected with the shell, an oil distribution cover is fixedly connected in the shell, the oil distribution cover is rotatably connected with a flow distribution plate, and the flow distribution plate is fixedly connected with the shell. A blocking piece is fixedly connected to the surface of the valve plate, a groove is formed in the surface of the oil distribution cover, a push rod is slidably connected into the groove, the blocking piece is connected with the push rod in an inserted mode, the push rod is elastically connected with a limiting plate, the limiting plate is in threaded connection with the adjusting piece through a screw rod, and an oil return opening is formed in the groove and communicated with the interior of the shell. The valve plate has the beneficial effects that in a dynamic balance state, the elastic force of the spring and the hydraulic force are balanced in real time, so that the pre-compression angle is automatically adjusted along with the pressure of the oil discharge kidney-shaped hole, and the pressure transition process is always in an optimal state, so that the valve plate can adapt to the working condition change, and the flow pulsation is effectively inhibited and optimized.

The invention relates to the technical field of industrial automation, and discloses a multi-mode switching control method for a variable displacement piston pump driven by a servo motor, which comprises the following steps of: acquiring multi-dimensional operation state parameters and load power of a variable displacement piston pump system; performing dynamic mode decomposition on the load power signal, and executing preset state switching compensation mapping to complete mode switching on the basis of the extracted mode characteristics and the current state parameter under the condition of judging that the switching condition is satisfied; executing a corresponding control strategy in the new mode, and dynamically adjusting the pump displacement and the rotating speed of the servo motor through feedback control; and detecting the response and energy efficiency performance of the regulation and control system according to the performance index in the system operation process. By adopting a dynamic mode intelligent switching mechanism, the system can automatically match the optimal operation mode in different working environments, the energy utilization efficiency is greatly improved, and the effects of effectively reducing energy waste and reducing the total energy consumption of the system during stable load or low load operation are achieved.

The invention belongs to the related technical field of plunger pumps, and discloses a leakage-free oil-water separation type plunger pump which comprises a cylinder body, a lining, a large plunger, a small plunger and an elastic sealing piece. A third groove is formed in one end of the cylinder body, a first through hole is formed in the bottom face of the third groove in a penetrating mode, and the first through hole is used for containing the large plunger; one end of the bushing is arranged in the third groove; the small plunger is step-shaped, and a first step surface is formed on the small plunger; one end of the small plunger is positioned in the bushing, and the other end of the small plunger penetrates through the elastic sealing element and then is connected to one end of the large plunger positioned in the cylinder body; the first step face and the large plunger press the middle of the elastic sealing piece to form inner-layer sealing, the lining and the bottom face of the third groove press the outer edge of the elastic sealing piece to form outer-layer sealing, and the inner-layer sealing and the outer-layer sealing are jointly used for isolating a working medium and a lubricating medium which are located on the two opposite sides of the elastic sealing piece respectively. And oil-water mutual seepage is prevented.

The invention belongs to the technical field of liquid pumps, and particularly relates to a plunger pump. Four plunger holes are distributed in the pump head in a matrix mode, water inlet one-way valves are arranged in the four plunger holes, a water outlet pipeline communicated with the corresponding plunger hole is arranged on the pump head beside each plunger hole, a first water outlet one-way valve is arranged in each water outlet pipeline, a water catchment channel is further arranged in the pump head, and the water catchment channel is communicated with the water outlet pipelines through communicating holes. The water outlet hole is communicated with the water catchment channel, and a second water outlet one-way valve is arranged on the water outlet hole; the pump head is further provided with a water return channel and a pressure regulating valve hole, the water return channel, the pressure regulating valve hole and the water catchment channel are communicated, and a pressure regulating valve is arranged in the pressure regulating valve hole. The water outlet hole and the pressure regulating valve hole are obliquely formed in the pump head, and the outer ends of the second water outlet one-way valve and the pressure regulating valve extend out of the pump head and are located on the two sides of the water inlet hole; the four plunger holes are distributed in a matrix mode to replace a traditional linear side-by-side layout to share the same water catchment channel and the same water return channel, and space and materials are saved.

The invention belongs to the technical field of dry ice air jet, particularly relates to a dry ice air jet generating device and method, and aims to form high-speed airflow by using compressed air and dry ice particles so as to be applied to the fields of industrial cleaning, surface treatment and the like. The main device comprises an air compressor, an air storage bottle, a high-pressure hose, a stop valve, a pressure release valve, a pressure gauge, a dry ice particle preparation system, an ejector and a self-oscillation nozzle. The method comprises the steps that the air compressor compresses air to high pressure and stores the air in the air storage bottle; the liquid carbon dioxide is pressurized and conveyed into the ice forming barrel through the plunger pump, and the liquid carbon dioxide is converted into dry ice through temperature and pressure changes; and the dry ice is cut into dry ice particles by the ultrasonic knife net. Then, the dry ice particles and compressed air are mixed in the ejector and accelerated to a high speed; and finally, spraying the mixture through a self-oscillation nozzle to form a high-speed dry ice air jet flow. By means of the method, the dry ice air jet can be efficiently and stably generated, and the method is suitable for various industrial applications such as cleaning, surface treatment and sand blasting. The device is simple in structure and convenient to operate, and has high application value.

The invention relates to the technical field of oilfield water injection, and discloses a water injection skid process system with self-adaptive switching and redundancy functions and a control method. The water injection skid process system comprises a main process unit which is formed by connecting a main centrifugal pump and a main plunger pump in series; the self-adaptive switching unit comprises a standby pump set branch, a bypass branch and a control module; and the redundancy design unit is used for carrying out double-valve parallel redundancy configuration on the key valves and carrying out double-path redundancy setting on the key sensors. According to the invention, a three-layer structure with a main process, self-adaptive switching and redundancy design is systematically constructed, and a hardware foundation of a high-reliability water injection system is laid. The structure not only realizes a conventional water injection function, but also remarkably reduces the risk of single-point failure by introducing redundancy and a self-adaptive mechanism, so that the system can keep continuous operation when equipment fails or working conditions are abnormal, the stability and production efficiency of oilfield water injection operation are greatly improved, and the economic benefit is increased. The problems of poor single-point fault resistance and lack of working condition self-adaption are solved.

The invention relates to the technical field of hydraulic element testing, in particular to a high-pressure axial plunger pump bearing bush pair interface friction and oil film characteristic testing device. According to the device, 10-60 MPa adjustable oil pressure is provided through the hydraulic pipeline unit, the driving unit achieves power loading and friction monitoring through a servo motor and a torque sensor, the main body unit conveys high-pressure oil to a bearing bush contact face through an in-shaft cross-shaped oil duct structure to form a static pressure supporting oil film, and a micron-sized oil film sensor is integrated; the oil detection unit monitors oil parameters, and the signal acquisition and control unit performs closed-loop regulation on oil supply flow, motor rotating speed and swash plate load based on oil film thickness, torque and pressure signals. The method has the beneficial effects that 0.2 mu m-level oil film fracture identification is realized, the occurrence rate of dry friction is reduced by 82% through a cross-shaped oil duct in the shaft, and the oil film fluctuation rate lt is cooperatively controlled through multiple parameters; + / -3%, the safety interlocking mechanism responds abnormally within 0.3 s.

The utility model belongs to the technical field of skid steer loaders, and relates to a mechanical control device of a skid steer loader, which comprises two handles. The two handles are operated front and back to control the servo plunger pump so as to control walking and steering of the skid steer loader; the multi-way valve is in transmission connection with the two handles, and the two handles are operated leftwards and rightwards to control the multi-way valve so as to control a bucket of the skid loader to ascend, descend and turn over; the servo plunger pump comprises a reset mechanism, the reset mechanism comprises a limiting support, an elastic element and two pull rods in transmission connection with the two handles respectively, the two pull rods are arranged on the limiting support in a sliding mode, the pull rods are provided with limiting mechanisms for limiting the strokes of the pull rods on the limiting support, and the elastic element is arranged between the pull rods and the limiting support. The maximum vehicle speed can be directly adjusted by adjusting the position of the limiting mechanism on the pull rod, the maximum vehicle speed can be adjusted according to habits or working conditions of different operators, and then operation flexibility, comfort and safety are improved.

The filling device comprises the plunger pump, a driving device and push rods, the bottom of the plunger pump is connected with the tops of the push rods through connecting sleeves and locking sleeves, a plurality of push rods penetrate through an integral push rod seat, the bottoms of the push rods are connected with the driving device, the upper end of the plunger pump is mounted on a plunger mounting plate, and the lower end of the plunger pump is mounted on the plunger mounting plate. A connecting groove is formed in the side face of the connecting sleeve, the locking sleeve is matched with the locking groove of the connecting sleeve, the locking sleeve is connected with the connecting sleeve through a plurality of bolts, a guide device of the push rod is changed, meanwhile, the connecting structure of the plunger and the push rod is changed, cleaning is convenient, and sanitary dead corners are reduced.

The application discloses a high-bearing-column-piston pump friction pair friction and wear testing machine, wherein the lower sample is installed on a lower sample clamp, the lower end of the lower sample clamp is provided with a lifting mechanism for driving the vertical movement of the lower sample to make the lower sample contact or separate from the upper sample, and the upper end of the upper sample is connected with a rotary driving device for driving the rotation of the upper sample through an upper sample clamp. The loading of the testing machine is matched with a lead screw through an optimized mechanical structure design, the loading precision is high, the accuracy of experimental results is improved, stepless loading can be realized, and the testing machine is suitable for the friction and wear characteristic research of friction pairs under various pressures; the testing machine is provided with an oil collecting mechanism, the oil at any moment during the experiment can be collected, the change of the physicochemical indexes of the oil during the whole experiment can be detected, and the influence of the change of the physicochemical indexes of the oil on the friction and wear of the friction pair can be accurately analyzed.

The invention discloses a modularized hydraulic system testing system and method, and relates to the technical field of hydraulic testing, and the method comprises the following steps: S1, collecting outlet pulsating pressure signals of a high-pressure plunger pump and a low-pressure vane pump by adopting a nanosecond-level synchronous time mark system, generating a phase residual error map, and calculating a phase residual error map of the outlet pulsating pressure signals of the high-pressure plunger pump and the low-pressure vane pump; the hidden resonance risk is preliminarily judged through frequency drift and amplitude gradient calculation; and S2, on the basis of the synchronous acquisition base line, carrying out cross spectrum coherence degree calculation and phase difference time sequence analysis on the pulsating pressure sequence, identifying a frequency dislocation anchor point, generating a pump source pulsating interference fingerprint, and determining a time window of recessive resonance. According to the method, real-time identification, dynamic intervention and closed-loop control of recessive resonance in the hydraulic system are realized through nanosecond-level synchronous acquisition, phase conjugate inversion and frequency dislocation traction strategies, energy coupling caused by frequency dislocation is effectively avoided, the operation stability and safety of the system are improved, and the service life of equipment is prolonged.

The invention relates to an intelligent decision-making method for a section drifting buoy driven by a digital twinborn model, and belongs to the technical field of decision-making optimization. A mechanical motion model of the section drifting buoy is constructed, and the digital twinborn model is obtained; establishing an agent model based on a gradient lifting tree model to represent a mapping relation between the operation speed, the operation depth and the oil discharge time of the profile drifting buoy and the energy consumption and the operation time of the plunger pump; constructing a cost function, determining a weight in the cost function based on a fuzzy rule, and setting a physical constraint; defining a decision variable, substituting the decision variable into a swarm intelligence optimization algorithm, calculating a Pareto frontier, and screening a preset proportion of Pareto frontier to obtain a candidate solution set; according to the candidate solution set, a digital twinborn model and a cost function are utilized to calculate the total cost value, a decision variable corresponding to the minimum total cost value is obtained, the energy consumption and time efficiency of the buoy floating process are improved, the decision precision is guaranteed, the calculation complexity is reduced, and the autonomous intelligent decision requirement of the buoy in the complex marine environment is met.

The utility model relates to the technical field of reciprocating plunger pumps, and provides a plunger pressing sleeve assembly of a reciprocating plunger pump, which comprises a pressing sleeve, one end of the inner wall of the pressing sleeve is provided with a limiting part, and one side of the limiting part is sleeved with a spring and a sealing filler which are tightly attached to the inner wall of the pressing sleeve; through the wave spring, the sealing performance is improved, and the abrasion loss of a sealing material is compensated; the structure is simple, the dismounting efficiency is high, and the maintenance cost and time are reduced; the leakage flow direction is changed, and emulsification of crankcase lubricating oil is avoided; the device is made of a high-strength material, and is good in compression resistance and corrosion resistance.

According to the intelligent plunger pump temperature control method and system based on model predictive control, a thermodynamic model predictive control algorithm is introduced, key parameters such as the oil temperature of a plunger pump body, the water temperature of a water tank and the environment temperature are brought into a unified calculation model, and cooperative closed-loop control over a heating plate, a semiconductor chilling plate and a circulating pump is achieved. By constructing the heat balance equation of the lumped heat capacity system and solving the rolling optimization problem in the limited time domain, the heat load change of the plunger pump can be accurately predicted and adjusted in advance, the oil temperature is always stabilized in the preset target interval, and the temperature control precision is remarkably improved; meanwhile, mutual exclusion constraints of heating and refrigerating power are set, and weights are dynamically adjusted and optimized according to working conditions, so that meaningless consumption of energy is effectively avoided, and the operation cost of equipment is reduced; in addition, according to the control method, preheating, cooling and energy-saving modes can be automatically recognized, so that the plunger pump is rapidly started in the severe cold environment and stably operates in the high-temperature environment.

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 provides an axial plunger pump fault diagnosis method suitable for marking sample scarcity conditions, and belongs to the technical field of fault diagnosis, aiming at performance degradation caused by marking sample scarcity in axial plunger pump fault diagnosis of a deep learning model. According to the method, the dynamic pressure simulation model is constructed under the condition that the marked samples are scarce, and unmarked samples can be supplemented by generating high-quality simulation samples; a model migration framework and a semi-supervised multi-adversarial pre-adaptation strategy are constructed, and the generalization ability of the model in a target domain task is improved. Experimental results show that high-quality simulation samples are generated, and the plunger pump fault sample recognition rate under the condition that marked samples are scarce is increased.

The invention relates to the technical field of oil field oil production engineering, in particular to an underground data acquisition unit with flow, pressure and temperature monitoring functions and a method. The method is suitable for underground working condition monitoring of submersible motor type lifting equipment such as submersible screw pumps, submersible plunger pumps and submersible centrifugal pumps. The unit comprises a pressure-resistant shell, wherein a central pipe, an electromagnetic flowmeter, two pressure and temperature sensors and an underground parameter collector are integrated in the pressure-resistant shell; the two sensors are used for measuring the temperature and pressure of liquid flow of the central pipe and the temperature and pressure of an oil casing annulus respectively; the electromagnetic flowmeter measures the flow, and real-time temperature and pressure data are used for compensation to improve the precision. The unit is further provided with a collecting pipe, an upper end, a lower end, a connecting sliding ring, an annulus / oil pipe inner testing channel, a sealing rubber ring and the like. Through the integrated design, synchronous high-precision in-situ monitoring of underground key parameters is achieved, the problem that underground data of multiple instruments are not synchronous is solved, and a reliable data terminal is provided for an intelligent oil field.

The high-pressure cleaning machine comprises a shell and a plunger pump, the plunger pump is arranged on the shell, the high-pressure cleaning machine further comprises a Venturi tube, a siphon guide pipe and a flow adjusting device, a water channel, a cleaning liquid box and a mixing box are arranged on the shell, the two ends of the water channel are communicated with a water outlet of the plunger pump and the mixing box respectively, and the Venturi tube is installed and communicated in the water channel; the siphon guide pipe is installed on the shell, one end of the siphon guide pipe is installed and communicated with the throat portion of the Venturi tube, the other end of the siphon guide pipe is installed and communicated with the bottom of the cleaning liquid box, a first one-way valve is arranged in the siphon guide pipe, an impeller is rotationally connected into the mixing box, and the flow adjusting device is arranged on the siphon guide pipe and used for adjusting the suction amount of cleaning liquid. By means of the Venturi effect, when high-pressure water flow passes through the throat portion of the Venturi tube, the flow speed is increased, the pressure intensity is reduced, negative pressure is formed, the cleaning liquid is sucked into the water channel from the cleaning liquid box through the siphon guide pipe, automatic mixing of the cleaning liquid is achieved, the cleaning efficiency is improved, and the high-pressure cleaning machine is convenient to use.

The invention relates to the technical field of fuel nozzle performance testing, in particular to an integrated high-precision fuel flow testing method and detection method.The testing method comprises the steps that a spraying test bed or a nozzle test bed is correspondingly selected based on whether a to-be-tested workpiece tests the spraying angle or not; after the integrated high-precision fuel oil flow testing device is in a reset state, a corresponding motor rotating speed is input to a digital control system based on the calibrated flow of the workpiece to be tested, a plunger pump of a high-pressure oil supply system is started, and oil liquid in an oil tank system is pumped to a corresponding spray test bed or nozzle test bed to run; the actual pressure difference of the workpiece to be measured is collected and transmitted to the digital control system, the actual pressure difference and the target pressure difference are compared, and the actual pressure difference is adjusted; when the preliminarily obtained actual oil flow is larger than a detection threshold value, the actual oil flow corresponding to the current flowmeter is defined as corresponding detection data; and when the preliminarily obtained actual oil flow is smaller than or equal to the detection threshold value, a weighing method is adopted for flow detection.

According to the plunger pump bearing inner and outer ring gap self-adaptive adjustment method and device, magnetic components distributed at intervals in the circumferential direction are embedded into the bearing inner ring, a magnetic flux detection unit corresponding to the magnetic components is arranged at the position, close to the periphery, of the outer ring, and the magnetic field intensity changes of the inner ring and the outer ring are monitored in real time; coil groups in one-to-one correspondence with the magnetic parts are also arranged in the outer ring and are used for generating a controllable magnetic field. The system collects magnetic flux data through the detection unit, judges deviation positions and offsets of the inner ring and the outer ring, controls the corresponding coil assembly to be connected with current according to the offsets, forms a magnetic field with the same or opposite polarity as the magnetic component, and dynamically adjusts the gap. The method can compensate eccentric wear of inner and outer rings caused by non-uniform stress of the main shaft, reduce the wear risk of the roller, improve the running stability of the bearing, prolong the service life of the pump body and optimize the performance.

The invention belongs to the technical field of underwater bionic robots, and particularly relates to a robotic fish deformable tail fin based on hydraulic drive and a working method thereof. According to the robotic fish based on hydraulic driving, a four-cylinder plunger pump is arranged in the fish head to serve as a hydraulic power source, the fish body comprises a large connector, a middle connector and a small connector, the large connector distributes hydraulic oil to a bionic driving unit set of a joint I, left-right bending of the fish body is achieved, meanwhile, the hydraulic oil is conveyed to the middle connector through an oil conveying pipe, and the small connector distributes the hydraulic oil to the joint I; after pressure synchronization is guaranteed through a pressure equalizing annular pipeline in the fishtail, a piston of a joint II is driven to move, the fishtail is designed to be a deformable tail fin, a tail arm is pushed to rotate through the synchronously-moving piston, and then a tail edge pipe is driven to deform and relatively move, so that the fishtail can dynamically change the area, the camber and the shape in the swimming process; therefore, different cruising speed and maneuverability requirements are met. Through the centralized hydraulic system and bionic structure design, active controllable adjustment of the shape of the deformable tail fin is achieved.

The invention relates to the technical field of coal mine overlying strata separation layer grouting and filling mining, and particularly discloses an overlying strata separation layer grouting and filling mining underground grouting drilling construction method and a grouting system.The grouting system comprises a ground slurrying system, a slurry conveying drilling hole, an underground grouting pool, a high-pressure plunger pump, a directional drilling structure and a grouting pressure control system; slurry is prepared on the ground surface, and the slurry is pumped to an underground grouting pool through a slurry conveying drill hole; a high-pressure plunger pump is used for injecting slurry into the overlying strata separation layer through a directional drilling structure; the construction of the underground directional grouting drilling is carried out before the working face is mined, the track of the underground directional grouting drilling comprises a trepanning linear section, a pitching-up section, a linear section, a pitching-down section and an open hole section which are connected in sequence, upward penetrating and downward penetrating of a grouting key layer bottom plate are achieved, and a final hole is located below the key layer bottom plate by 5 m. The problem that ground drilling construction cannot be carried out under the complex terrain is solved, and the method has the advantages of being low in investment, high in efficiency and capable of releasing pressing and covering coal resources.

The utility model discloses a plunger pump, and belongs to the technical field of oil and gas exploitation, the plunger pump comprises a pull rod, a crosshead, a bearing bush, a connecting rod and a detection piece, one end of the pull rod is fixedly connected with the crosshead, the other end of the crosshead is connected with the connecting rod, and the bearing bush is arranged between the crosshead and the connecting rod; the crosshead is provided with a detection hole, one end of the detection hole extends to the end face of one end, facing the bearing bush, of the crosshead, and the detection piece detects the temperature of the bearing bush through the detection hole. According to the plunger pump, whether the bearing bush of the crosshead is burnt or not can be determined by detecting the working temperature of the bearing bush of the crosshead in the plunger pump, so that a new bearing bush can be replaced in time, the plunger pump can be prevented from being greatly damaged, and it is guaranteed that normal operation can be conducted stably.

The utility model discloses a fluid end of a plunger pump and the plunger pump, and relates to the field of oil and gas equipment. The hydraulic end comprises a valve box, a plunger, a first valve assembly, a second valve assembly and a plugging assembly. The valve box is provided with a valve cavity, a plunger channel, a liquid inlet, a liquid outlet and a valve hole, the plunger channel communicates with the valve cavity, the valve hole communicates with the valve cavity and is opposite to the plunger channel in the first direction, the liquid inlet and the liquid outlet communicate with the valve cavity, and the liquid inlet and the liquid outlet are opposite to each other in the second direction; the plunger is movably arranged in the plunger channel, the first valve assembly is arranged at the liquid inlet, the second valve assembly is arranged at the liquid outlet, and the plugging assembly is arranged at the valve hole; the plugging assembly comprises a pressing cap, an external thread structure is arranged on the peripheral face of the pressing cap, and the fillet range of the thread root of the external thread structure ranges from R0.6 mm to R1.5 mm. An internal thread structure is arranged on the hole wall of the valve hole and connected with the external thread structure in a matched mode. The problem that the root of the thread tooth of the suction pressing cap is prone to fatigue cracking is solved.