344 results about "Pressure transmission" patented technology

The invention discloses a temperature and pressure sensor for a new energy automobile, and belongs to the technical field of sensor equipment, the temperature and pressure sensor comprises a plug assembly, a shell and a protective sleeve, a support seat, a circuit board, a temperature sensing probe and a pressure sensing element are arranged in the shell, the protective sleeve is arranged at the lower waist part of the support seat, and the temperature sensing probe is located in the protective sleeve and is in electric signal connection with the circuit board; a square groove for containing the pressure sensing element and the circuit board is formed in the top of the support base, the pressure sensing element is arranged at the bottom of the circuit board and is in electric signal connection with the circuit board, and a pressure transmission channel is further arranged in the shell. The pressure transmission channel comprises a gap part defined by a protective sleeve and a shell and a special-shaped channel formed in the support base, a circular pressure groove is formed in the square groove, the circular pressure groove is matched with the pressure sensing element to form a pressure cavity which is eccentrically designed relative to the shell in the axial direction, and the special-shaped channel is formed in a medium leading-in area. Therefore, the medium entering surface area can be increased through the eccentric design, and the response speed of medium pressure measurement is ensured.

An electric hydraulic brake includes: wheel brakes configured to braking force to wheels of a vehicle; a reservoir storing brake oil; a master cylinder connected to the reservoir, and operated in conjunction with a main brake motor to generate pressure of the brake oil; a first controller configured to control the main brake motor; a hydraulic controller including a pump configured to form pressure of the brake oil in conjunction with an auxiliary brake motor, and a hydraulic block configured to selectively transmit the pressure of the brake oil formed in the master cylinder or the pump to the wheel brakes; and a second controller configured to control the auxiliary brake motor when the master cylinder or the first controller malfunctions. The hydraulic controller is provided with an auxiliary flow path to transmit the brake oil from the reservoir to the pump directly through the auxiliary flow path.

The utility model discloses a pressure balance fluid control valve which comprises a valve body provided with an input interface and an output interface, and the valve body is connected with an external pipeline through the input interface and the output interface; the valve element assembly is arranged in the valve body and used for controlling connection and disconnection between the input connector and the output connector. The pressure conduction assembly is connected with the valve element assembly so as to conduct pressure borne by the side, opposite to the fluid, of the valve element assembly to the other side of the valve element assembly. Pressure balance on the two sides of the valve element is achieved through pressure conduction, operating force is reduced, abrasion is reduced, the stability of the valve is improved, the service life of the valve is prolonged, and the overall reliability is enhanced.

The invention belongs to the field of hydraulic cylinder application, and provides a hydraulic cylinder automatic detection device which comprises a detection equipment support, a placement base is fixedly installed at the bottom of the detection equipment support, a placement groove is formed in the middle of the top end of the placement base, a hydraulic cylinder barrel is placed in the placement groove, and a piston rod is movably arranged at the top end of the hydraulic cylinder barrel. A supporting part is arranged on the top of the detection equipment support and located above the hydraulic cylinder barrel, a pressure detector is installed in the middle of the top end of the supporting part, the bottom end of the pressure detector extends into the supporting part to be provided with a pressure sensor, and a controller is installed in the middle of the outer surface of the detection equipment support. The limiting and fixing mechanism is matched with hydraulic cylinder barrels of different sizes through cooperation of a movable supporting plate, a sliding block and a positioning clamping block, and fixing in the horizontal direction and the vertical direction is achieved; an inclined supporting rod and a threaded supporting rod of the supporting mechanism can adjust the supporting height and angle, the top of the hydraulic cylinder barrel is further stabilized, the problem of deviation during detection is solved, and accurate pressure transmission is guaranteed.

The invention relates to the technical field of valve detection, and discloses a ball valve airtightness detection method and system. The method comprises the following steps: in a pressurization and pressure maintaining test, synchronously acquiring multi-channel pressure information flow, and constructing a three-dimensional pressure field dynamic evolution sequence reflecting a sealing interface pressure transmission process; time-frequency domain cross comparison is carried out on the sequence and a leakage signal simulation library, potential leakage characteristic signals are extracted, reverse tracing analysis of a leakage energy propagation path is carried out on the potential leakage characteristic signals, and therefore space coordinates and energy intensity of a suspected leakage source are determined. And finally, calculating an overall leakage state index, and generating a sealing state evaluation map and a maintenance operation sequence. According to the method, the transformation from single-point pressure monitoring to three-dimensional pressure field dynamic analysis is realized, the position of a leakage source can be accurately positioned, and the detection intuition and the maintenance pertinence are improved.

The utility model relates to a test device for testing a relationship between fractured rock mass damage and permeability change. A bidirectional loading unit comprises a sample underframe, a long-end fixing plate, a wide-end fixing plate, a lateral pressure transmission mechanism and a manual turbine loading device, the sample underframe is of an I-shaped structure; the two long-end fixing plates are oppositely fixed on the outer sides of the two ends of the sample underframe in the length direction; the two wide-end fixing plates are oppositely fixed on the front side and the rear side of the web plate on the sample underframe; the two lateral pressure transmission mechanisms are oppositely distributed left and right; the lateral pressure transmission mechanism comprises a lateral pressure plate, a main guide rod, a pressure bearing end and an auxiliary guide rod; the manual turbine loading device comprises two lateral counter-force plates, two lateral counter-force reinforcing rods, two manual turbine speed reducers, two flexible pressurizing plates and two pressure sensors; the vertical loading unit comprises an upper pressing plate, a dowel bar and a variable cross-section connector; and the permeation unit comprises two glass plates. The device can be used for testing the deformation, fracture, strength and permeation characteristics of the fractured rock mass sample under different confining pressures.

The invention relates to the technical field of performance detection of foam cement slurry for well cementation of oil and gas wells, in particular to a device and method for evaluating the compression performance of foam cement slurry. The former comprises a pressure tank, a test tank and a gas adding tank, the upper end of the pressure tank is provided with a gas inlet communicated with the inside and the outside, and the lower end of the pressure tank is provided with a liquid outlet communicated with the inside and the outside; a pressure transmission piston is vertically and slidably installed in the pressure tank in a sealed mode, and an identification layer is arranged on the outer side of the pressure tank. The device is reasonable and compact in structure, the gas adding tank can inject gas with different pressure values into the pressure tank, the control valve facilitates pressure control between the pressure tank and the testing tank, scale marks are marked on the measurable cup body so that the volume change of water for testing can be observed conveniently, and therefore the volume change of foam mud to be tested is reflected; the pressure measuring piston can transmit pressure to the foam cement slurry in the testing tank, air between the pressure measuring piston and the inner side of the upper portion of the testing tank can be emptied during operation by arranging the exhaust hole and the exhaust valve, and the measured volume error is reduced.

The invention discloses a wall detection device for architectural design, and relates to the technical field of wall detection, the wall detection device comprises a detection main frame body, a first motor and a second motor are symmetrically mounted on the upper surface of the bottom of the detection main frame body, and output shafts of the first motor and the second motor are fixedly connected with a lifting mechanism; the wall detection device for architectural design further comprises a pressure gauge and three contact wheels which are arranged in an arc shape to form an integral contact surface, the transverse moving mechanism is linked with the lifting mechanism to perform multi-area detection on the wall, and when the pressure adjusting mechanism performs movement detection in the vertical and horizontal directions, the pressure adjusting mechanism can adjust the pressure in the vertical and horizontal directions. The abutting wheels conduct abutting type elastic pressure self-adjustment on the radian of the wall and feed pressure elasticity back to the pressure gauge, the auxiliary deformation mechanism is matched with the radian through elastic deformation of the center and the abutting wheels on the two sides, and the comprehensive pressure of the abutting wheels on the wall is transmitted to the pressure gauge. The multi-dimensional cooperative detection optimization effect of a mechanical structure, pressure feedback and motion control is achieved.

The utility model relates to shield muck pipeline transportation technical field, concretely is a kind of dense paste conveying pipeline pressure testing device, including base pipe, the middle position of base pipe is equipped with oil cylinder, and the space between packing seal and diaphragm is provided with piston in the inside of oil cylinder, away from base pipe side and close to base pipe side respectively in oil cylinder, the top of oil cylinder is equipped with driving motor, and the top of piston is connected with piston rod that passes through packing seal and is connected with the output end of driving motor, and the shape of diaphragm is consistent with pipeline inner wall, so that diaphragm directly contacts with muck paste, facilitate pressure transmission, and pressure transmission is accurate;Operating clearance can make diaphragm oscillation, carry out self-cleaning, remove the muck adhered to its surface, avoid the problem that muck hardens and thus leads to signal distortion;Pressure transmitter converts pressure signal into electric signal, can be displayed in place through secondary instrument, and also can be transmitted wirelessly through wireless transmitter, and signal is wirelessly transmitted.

The invention provides a laboratory reagent distribution device and a laboratory reagent distribution method. The distribution device comprises a rack, a distribution quantity control mechanism arranged on the rack, a pressure transmission assembly and a multi-channel cooperative control valve group, the distribution quantity control mechanism is used for generating distribution pressure with preset volume, a pressure outlet of the distribution quantity control mechanism is connected with a first transmission port of the pressure transmission assembly, and a second transmission port of the pressure transmission assembly is connected with an air inlet of the multi-channel cooperative control valve group; the multi-channel cooperative control valve set comprises a valve element and a valve seat, a main air guide channel is arranged in the valve element, a plurality of branch air guide channels are arranged around the center of the valve seat in the radial direction of the valve seat, and the valve element is rotationally connected with the valve seat so that the main air guide channel can be communicated with any branch air guide channel. The plurality of branch air guide channels are respectively connected with a plurality of reagent bottles in a one-to-one correspondence manner; each reagent bottle is connected with a liquid outlet pipe group for distributing reagents; the method can be suitable for a small-scale intermittent experiment mode, the comprehensive utilization rate of the reagent can be improved, and the taking process is simplified.

This utility model discloses a winding pressure roller, comprising: an outer roller, an elastic layer covering the outer circumferential surface of the outer roller, and a left and right shaft head of the pressure roller, which are coaxially assembled inside the outer roller. The left shaft head includes a left first section and a left second section arranged along its axial direction, and the right shaft head includes a right first section and a right second section arranged along its axial direction. The outer circumferences of the left first section and the right first section are respectively connected to the inner wall of the outer roller; gaps are formed between the outer circumferences of the left second section and the right second section and the inner wall of the outer roller. When the left and right shaft heads are assembled inside the outer roller, a certain gap is left between their opposing inner end faces. This utility model's winding pressure roller, through its split shaft head and key gap design, effectively avoids the direct impact of shaft head deformation on the outer roller, ensuring uniform pressure transmission, thereby improving winding quality and production efficiency.

The utility model belongs to the technical field of barometers, and particularly relates to a barometer which comprises a meter shell, an air inlet, a meter cover, a dial plate and a pointer, the air inlet is arranged on the meter shell, air transmits pressure to a piston through the air inlet, the piston converts the air pressure into linear displacement, and the pointer is arranged on the meter shell. The piston transmits power to the gear output piece through the two-stage transmission mechanism, the gear output piece is connected with the pointer and drives the pointer to deflect on the dial plate, the piston is further connected with a reset piece, and the reset piece acts on the piston and provides pressure opposite to gas acting force. By means of a two-stage transmission mechanism composed of the double sector gears, the rack frame and the cylindrical gear, tiny linear displacement of the piston is amplified and converted into remarkable deflection of the pointer, the detection sensitivity of tiny air pressure changes is remarkably improved, the reading range is expanded, and reading is more accurate and visual.

The present invention discloses a crushing device for asphalt production and processing with a screening function, which relates to the technical field of asphalt crushing devices. It includes a bracket, a housing, a crushing roller, a discharge port, a cold brittle component, a drive component, and a detection cleaning plate. The present invention uses the cleaning claws on the cleaning head to convert the convex state of the roller body into its own deflection. The cleaning head further converts the deflection into the displacement of the transmission device through the transmission teeth. The displacement of the transmission device drives the flow medium to compress, thereby causing pressure on the transmission plug. The transmission plug transmits the pressure to the piezoelectric body. The piezoelectric body generates an electrical signal after being compressed, achieving the purpose of detecting the cleanliness of the roller body. The fixing device drives the tooth column to rise, and the tooth column drives the cleaning head to reverse deflection and reset. Under the action of the fixing device, the cleaning head is fixed. After being fixed, the cleaning head uses the cleaning claws on it to scrape the raw materials on the roller body, realizing the state conversion of the cleaning claw activity detection and fixed cleaning.

The utility model discloses a temperature measuring device and a vehicle, and the device comprises a heat conduction housing which comprises a cavity; the base is connected with the heat conduction shell, and the base and the heat conduction shell jointly limit the cavity to form a sealed gas containing cavity; the pressure detection assembly is arranged in the gas containing cavity and is arranged on the base; and the pressure conduction assembly is arranged on the base, the gas containing cavity covers the pressure conduction assembly, and the pressure conduction assembly covers the pressure detection assembly and is used for transmitting gas pressure in the gas containing cavity to the pressure detection assembly. According to the utility model, a pressure value of gas can be converted into a temperature value, so that a stable corresponding relation between the pressure value and the temperature value can be obtained, and the device has a wider temperature measurement range and good measurement precision.

The utility model belongs to the field of valves in wells, and particularly relates to a reverse circulation valve. In order to prolong the service life of the reverse circulation valve and save cost, the utility model provides the reverse circulation valve. The reverse circulation valve comprises a spring, a piston, an upper connector, an outer cylinder and a lower connector, a pressure transmitting hole is formed in the outer cylinder, and the piston comprises a pressure bearing face used for bearing pressure. The piston is located in the outer cylinder, the upper connector or the outer cylinder comprises a spring installation face, the spring is installed between the spring installation face and the piston, the lower connector or the outer cylinder comprises a limiting part, the limiting part is used for limiting the limiting position of downward movement of the piston, and a radial through hole used for being aligned with the pressure transmitting hole during inverse well flushing is formed in the piston; and the inner diameter of the pressurizing seat is smaller than the inner diameters of the upper joint, the lower joint and the outer cylinder. The pressurizing seat is additionally arranged on the piston, and when the spring cannot reset the piston, external force is applied to the pressurizing seat to drive the piston to reset, so that the service life of the reverse circulation valve is prolonged, and the cost is saved.

The utility model discloses a dismounting device for a large-diameter bolt in a narrow space, which is characterized in that in a bolt push-out assembly, a pressure transmission module is fixedly arranged on the inner side end face of one side plate of a bow-shaped clamp, and the other side plate of the bow-shaped clamp is in threaded connection with a hexagon bolt through a threaded hole in the middle; the groove-shaped cavity of the cushion block is arranged on the bolt head of the product bolt in a sleeving mode, the threaded end of the product bolt makes contact with the sensing end of the pressure transmission module, the hexagon bolt is screwed to enable pressure to act on the top end of the cushion block, counter-acting force acts on the threaded end of the product bolt through the pressure transmission module, and the product bolt is pushed out. The bolt head generates the displacement of being pushed out in the groove-shaped cavity of the cushion block; the bolt pulling-out assembly is arranged on the bolt head of the product bolt in a sleeving mode through the concave clamping groove in the end, and pulling-out force is applied to the product bolt through the concave clamping groove so that the product bolt can be pulled out of the machine body structure. The utility model solves the problem that the surface and the hole wall of the bolt are damaged due to local deformation of the butt-joint bolt easily caused by the traditional dismounting mode of the bolt.

The application discloses a far-near field cooperative roof cutting method and relates to the technical field of roof cutting. It comprises the following steps: using single hydraulic prop to cooperate with metal hinged roof beam and cross beam to pre-support the roof of the roadway, wherein the pre-roadway reinforcement is performed before the working face is mined, and the length of the pre-roadway reinforcement of the roadway to be left is appropriately lengthened, considering that the directional pre-splitting cutting hole is better in cutting seam outside the pre-pressure range. The application has the beneficial effects that: when in use, the pre-splitting roof cutting and the forced roof falling of the goaf block most of the mining pressure transmission to the roof of the roadway to be left, and the falling gangue supports the roof of the roadway to be left, thereby ensuring the stability of the roof of the roadway to be left along the goaf, and auxiliary support is performed during the roof cutting, so as to prevent the deformation of the roadway to be left from being too large and affecting the roadway to be left.

The application provides a static pressure balance type underwater self-driven flexible touch pressure sensing finger, which comprises a touch pressure sensing unit, a hydraulic cylinder, a pressure transmission unit, a piezoelectric transducing unit, a transducing unit support, a platinum electrode and a base, the touch pressure sensing unit and the pressure transmission unit are connected with the hydraulic cylinder through bolts, and the oil cavity between the piston end faces is filled with hydraulic oil; the piezoelectric transducing unit is inserted into the stepped through hole in the cylinder wall of the transducing unit support; the pressure transmission unit and the base are connected with the transducing unit support through a flange and a threaded pair; the platinum electrode is fixed in the lead hole of the piezoelectric transducing unit, and the lead of the platinum electrode is led out from the lead hole of the base and connected to a pressure detection circuit. Based on the area effect of Pascal's principle and the solid-liquid interface double electric layer principle, the application can convert the tiny pressure detected by the finger tip into a larger elastic deformation of the flexible hose, so as to generate a high-amplitude ionic current signal and transmit it to the pressure detection circuit, and realize the sensing, amplification and measurement of the pressure signal.

The application provides a whole vehicle ventilation volume testing device, system and whole vehicle ventilation volume testing method, relates to the field of vehicles, and utilizes the air volume collecting device to perform gas transmission between the air volume table and the vehicle cabin of the measured vehicle, so that the air volume table tests the gas flow of the vehicle cabin space, provides direct current power supply function for the measured vehicle through the power supply interface and the blower power supply system of the air volume table, realizes the testing function of the blower current through the current collecting interface and the blower power supply system of the air volume table, and realizes the testing function of the static pressure of the vehicle cabin through the static pressure collecting interface and the static pressure transmission device of the air volume table. The testing method can measure the total air volume and the air leakage volume of the air conditioning system when the air conditioning system works in any mode through the testing device, so that the actual ventilation volume of the air conditioning system in any mode is accurately measured, without the need of setting a tool for each ventilation opening. The testing device is more convenient to use, and the whole vehicle air volume can be obtained more quickly.

This invention provides a parallel collaborative pressurization forming system, relating to the field of hot pneumatic forming technology. The system is connected to a pressurization forming device, which includes two parallel station molds. The system comprises a central control subsystem and two pneumatic control subsystems, each connected to its corresponding station mold via a pressure transmission pipeline. The central control subsystem determines the initial pressurization rate and initial target pressure of the gas medium in each independent mold cavity. The pneumatic control subsystems pressurize according to the initial parameters. During pressurization, the central control subsystem acquires real-time pressure data to determine the current target pressurization rate and current target pressure. The pneumatic control subsystems adjust according to the current parameters until the tube is formed. This invention achieves independent and precise control of pressure and rate throughout the entire two-piece forming process through dual independent pneumatic control subsystems and a closed-loop central control system.

The invention relates to the technical field of unmanned aerial vehicle parts, in particular to an unmanned aerial vehicle waterproof airspeed tube convenient to disassemble and assemble, which comprises an air inlet piece, a pressure separation piece, an air inlet pipe and an airspeed tube. The air inlet pipe and the airspeed tube are both mounted in the pressure separation piece and are not directly communicated with each other; the air inlet piece is connected with the pressure separation piece, and external air enters the airspeed tube through the air inlet pipe to be measured. An air inlet cavity and a water baffle are arranged in the air inlet piece, and primary drainage is achieved through a first drainage assembly; the pressure separation part comprises a horizontal pressure transmission part and an inclined height difference flow guide part and is provided with a second drainage assembly, and the second drainage assembly comprises a water collection cavity and a second drainage port and is installed between the air inlet pipe and the airspeed pipe to achieve air-water separation and secondary drainage. The airspeed tube air inlet hole is higher than the air inlet tube exhaust hole, and accumulated water is further prevented from flowing backwards. The device is reasonable in structure, has good waterproof and drainage capacity, can improve the airspeed measurement precision, and is suitable for various unmanned aerial vehicle platforms with fixed wings, vertical take-off and landing and the like.

The utility model belongs to valve spare technical field relates to a kind of gas taking valve assembly with support.The utility model, including valve body main part, its characterized in that, the valve body main part has air inlet and air outlet, connecting channel is equipped between the air inlet and air outlet.The utility model in the gas taking process, gas passes through air inlet and enters connecting channel, pressure acts on the pressure slide bar in integrated elastic pressure structure, the pressure slide bar passes pressure to the pressure sensor in the monitoring piece directly opposite, pressure sensor converts pressure signal into electric signal and passes to micro MCU, micro MCU carries out analysis processing to signal, realizes the real-time monitoring to gas taking stage pressure, when pressure data appears exception, such as exceed the normal range of pre-set, micro MCU can judge that gas taking process exists fault, timely trigger alarm and other self-diagnosis function, remind user to take corresponding measure, avoid safety accident to occur.

The invention provides a fault diagnosis and reconstruction method for a cold air propulsion system based on pressure transmission. The method is suitable for spacecrafts with fault diagnosis requirements of the cold air propulsion system provided with a pressure sensor. Different from an existing method for indirectly diagnosing whether the propulsion system breaks down or not according to whether the air injection amount in unit time is abnormal or not, the invention designs a cold air propulsion system fault diagnosis and reconstruction strategy based on pressure transmission. The strategy comprises four algorithm modules: a pressure transmission fault detection and processing module, a pressure transmission integration-based cold air propulsion system fault diagnosis module, a pressure transmission-only-based propulsion system fault diagnosis module and a cold air propulsion system reconstruction strategy module. The four modules are organically combined, and the problems of fault diagnosis and reconstruction of the cold air propulsion system based on pressure transmission are systematically solved.

The present disclosure discloses a cordless roller shutter spring regulator, including a roller shutter spring pre-tightening force adjustment mechanism and a self-locking mechanism, wherein the self-locking mechanism is used to lock an adjustment shaft on the roller shutter spring pre-tightening force adjustment mechanism before an installation weight is installed; after the installation weight is installed, the self-locking mechanism unlocks the adjustment shaft on the roller shutter spring pre-tightening force adjustment mechanism under a top pressure of the installation weight. The self-locking mechanism includes a pressing spring, a self-locking ring and a fixed ring, wherein an end face of the self-locking ring is provided with a top pressure transmission rod and a ring of ratchet teeth A, the ratchet teeth A are engaged with the ratchet teeth B, the ratchet teeth A are able to slide in one direction relative to the ratchet teeth B.

The utility model provides a pressure transmission assembly and a pressure transmitter, the pressure transmission assembly is used for conducting pressure in a pressure conduction path of the pressure transmitter, the pressure transmitter comprises a first diaphragm and a second diaphragm, the first diaphragm is communicated with a pressure source to be measured, the second diaphragm is communicated with a piezoelectric conversion assembly, and the piezoelectric conversion assembly is connected with the first diaphragm and the second diaphragm. The pressure transmitting assembly comprises a membrane suitable for being arranged between the first membrane and the second membrane in an attached mode. The base body is fixedly connected with the periphery of the diaphragm; the pressure transmitter comprises the above pressure transmission assembly. According to the utility model, the problem that when the pressure of the to-be-measured pressure source is too large, the pressure measuring diaphragm is broken through and damaged, and then the pressure transmitting diaphragm on the other side is further affected, polluted and even damaged is solved.

Aircraft landing gear system (100, 200, 300), comprising actuators associated with the landing gear and supplied with pressurized hydraulic fluid by a hydraulic circuit (10; 15), including at least hatch and landing gear attachment boxes (106, 109, 206, 209, 306, 309), the aircraft comprising emergency extension means (20) capable of ensuring the release of the hatches and landing gear to cause the landing gear to extend under the effect of gravity in the event of failure of the hydraulic circuit. According to the invention, the emergency extension means comprise a pyrotechnic device (50) adapted to generate, in a controlled manner, pressurized gas acting on a first face of a piston (40) sliding with a seal in a chamber (30) such that a second face of the piston, in contact with the hydraulic fluid, transmits the pressure of the gas thus produced to at least the attachment boxes via the hydraulic fluid. FIGURE IN ABRIDGED FORM: Fig. 2

The utility model discloses a mechanism suitable for monitoring the oil pressure of a high-temperature hydraulic actuation product. The mechanism comprises two parts: a mechanical electrical signal conversion mechanism and a pressure transmission mechanism. Wherein the mechanical electrical signal conversion mechanism comprises a microswitch, a mounting seat, a rocker arm, a pin, a rocker arm torsion spring, a separation blade and a contact; the pressure transmission mechanism comprises a valve element, a valve sleeve, a spring, an outer end spring seat, an inner end spring seat and a plug. One end of the pressure transmission mechanism is communicated with oil pressure, the other end of the pressure transmission mechanism is connected with the mechanical electrical signal conversion mechanism, the pressure transmission mechanism plays a role in oil pressure change transmission and transmits the oil pressure change to the rocker arm of the pressure switch in a linear displacement mode, and the rocker arm switches on or switches off the microswitch in the moving process. And the microswitch transmits an on or off signal to a remote control terminal, so that the monitoring of the oil pressure is realized. The embodiment of the utility model has the advantages of compact structure and high applicable temperature, and can extend the application scene.

The utility model relates to the technical field of hoist, and disclose a general portal crane light weight trolley, including the frame, the frame is provided with two, two the frame between fixedly connected with the bottom plate, the bottom plate top fixedly connected with the hoist device, the frame outside is provided with the support subassembly. The utility model discloses through the frame and transmits pressure to first rotating seat, to this power transmission to first connecting ring, to this pressure transmission to sleeve and fixed disc, to this pressure transmission to second rotating seat, to this can be to the pressure and divide, and through the cooperation of first sliding rod, sleeve, fixed disc and spring, to this can make the frame in the appearance deformation, sleeve and first sliding rod can be under the action of spring, carry out the length adjustment, to this make the wheel can always contact the hoist, to this reduce the appearance wheel and be loaded too heavy, lead to the possible of appearing damage, to this reduce the possible maintenance time, to this improve production efficiency.

The invention relates to the technical field of drilling liner hangers, in particular to a hydraulic setting drilling liner hanger capable of preventing setting in advance. Comprising a connecting piece, the connecting piece is provided with through holes which are in mirror image and are distributed in an annular array mode, a liquid inlet cavity is formed in the connecting piece, a pressing sleeve is slidably connected into the liquid inlet cavity, and a fixing slip matched with the adjacent first limiting block is fixedly connected to the side, away from the pressing sleeve, in the connecting piece. Pressure transmitting holes distributed in a mirror image mode are formed in the side, close to the circle center, of the connecting piece, the connecting piece is rotationally connected with blocking pieces distributed in a mirror image mode, and the blocking pieces are provided with communicating holes. The mode that the pressure transmitting hole is blocked in advance is adopted, so that before a falling ball falls into the connecting piece, the pressing sleeve does not extrude the fixing slip in advance, and the situation that in the process that the connecting piece enters the shaft, the connecting piece and the tail pipe are fixed when not moving to the position needed by work in the shaft, and consequently descending of the tail pipe fails is prevented.

This utility model discloses a main shaft sealing structure for a cross-flow turbine unit, belonging to the technical field of sealing structures. It includes a cross-flow turbine unit body, with a main shaft body rotatably connected to one end of the main body. A protective sleeve is fitted onto the surface of the main shaft body. The main shaft body and the protective sleeve are rotatably connected via a sealed bearing. The protective sleeve and the cross-flow turbine unit body are connected via a connecting assembly. An alarm assembly is located below the protective sleeve. This utility model features a connecting assembly, which facilitates the installation of the protective sleeve. The structure is easy to use, requires no tools, and has simple steps. A rubber sealing ring facilitates sealing at the connection point. The alarm assembly allows for timely alerting of personnel when water enters. When water enters, the pressure is transmitted to a pressure sensor, which then transmits an electrical signal to the controller, thereby controlling a buzzer to sound and alert personnel.