363results about "Hydraulic/pneumatic force measurement" patented technology

The invention relates to a coal-rock mass ground stress continuous testing device and a method thereof which are mainly used for testing the stress and change regularity of rock in place or crushed coal-rock mass. The device consists of a ground stress sensor, a data acquisition instrument and a high pressure oil pump, which can work separately and can be connected with the data acquisition instrument to work. The ground stress sensor consists of a preposing capsule pressure sensor (1), a high-pressure oil tube (2), a tee (3), an electronic digital display hydraulic sensor (4), a valve (5) and a quick change coupler (6); wherein, the capsule pressure sensor is arranged inside a borehole, and can be well coupled with the coal-rock mass by injecting oil liquid; the ground stress testing results can be directly displayed on a pressure gauge; the sensor can be directly connected with a coal mine safety monitoring system, or the data can be acquired by the data acquisition instrument for remote data transmission, or telephone wires can be used for the communication between the sensor and ground modem as well as a computer; in ground-based computer software, the ground stress data and the change regularity thereof can be looked over.

An apparatus for measuring tension in guy wire systems wherein the lower end of the guy wire has a thimble adjoined by a connection pin to a yoke or clevis of a turnbuckle shackle bolt connected to an earth anchor. A block assembly is removably received beneath the clevis and a thimble-engaging jaw assembly is removably received on the guy wire above the clevis. The block assembly and jaw assembly are connected at one end by a threaded rod assembly that includes a strain sensor connected with an indicator device, and by a threaded rod at their opposed end. The jaw assembly is drawn downward by adjusting nuts on the threaded rods beneath the block assembly to engage the thimble and move it downward transferring the tension to the threaded rod and threaded rod assembly which is sensed by the strain sensor and indicated by the indicator device.

A pressure sensor includes: a supporting body which has an opening; a pressure detecting portion which includes a supporting film provided on the supporting body and having a diaphragm portion closing the opening, and a piezoelectric body provided on the diaphragm portion and deflecting to output an electric signal; a frame body which has, on the pressure detecting portion, a cylindrical cavity along a film thickness direction of the supporting film, and is formed, in plan view when viewed from the film thickness direction of the supporting film, at a position where a cylindrical inner peripheral wall of the cavity overlaps with the opening, or outside of the opening; a sealing film which closes the frame body; and a silicone oil which is filled in an inner space formed of the cylindrical inner peripheral wall of the cavity, the sealing film, and the pressure detecting portion.

Provided are a coal and rock mass stress orientation monitoring method and device. The device comprises a three-way valve, a pressure gage, a high-pressure oil pump, a cylinder body pressure sensor. The cylinder body pressure sensor is provided with three piston sensing pieces which are connected with piston cylinders of the piston sensing pieces respectively. The outer ends of high-pressure oil pipes connected with the piston cylinders are connected with the pressure gage or a data converter connected with a data collector and the high-pressure oil pump through the three-way valve respectively. After the cylinder body pressure sensor is arranged in a drilling hole, the cylinder body pressure sensor bears pressure by injecting oil liquid, the piston sensing pieces can be automatically adaptive to good coupling with a coal and rock mass, and stress magnitude and changing in the three directions in the coal and rock mass can be monitored. Monitoring can be carried out on an original rock mass and in a broken coal and rock mass, the coal and rock mass stress orientation monitoring method and device can be widely used in geostress measurement, surrounding rock stability analysis and the like of mines, construction, water conservancy, roads, tunnels and underground engineering.

The invention discloses a crustal stress rapid measuring device and method of a rock stratum under a coal mine. The device specifically comprises an electric control high pressure pump and a handlance which are integrated, a high pressure pipeline, a packer, a pressure sensor, a flow sensor, a hydraulic fracturing measurement and control instrument and the like. The method comprises the steps that: a segment of tunnel stable in surrounding rock property is selected, and a group of boreholes are formed in the tunnel, and the packer and the high pressure pipeline are installed in the boreholes and are further connected with equipment such as the high pressure pump so as to carry out hydraulic fracturing; in the hydraulic fracturing process, the measurement and control instrument is utilized to monitor and display pipeline water pressure and displacement data curves; according to the recorded pressure data and curves, the magnitude of the crustal stress is automatically calculated; and a colored borehole observation instrument with an annular transparent soft tube and a dial is utilized to observe the crack orientation of the hole wall, and the direction of the crustal stress is further determined. The whole set of system is simple in method, easy to operate, compact in equipment structure, convenient to carry and very beneficial to the rapid and reliable measurement of the crustal stress of the rock stratum under the coal mine, thereby ensuring the safe exploitation under the coal mine.

A liquid column-based normal/shear pressure/force sensing device having an elastic electrolyte-electrode contact with large interfacial capacitance to achieve high sensitivity and resolution with flexible and transparent constructs.

The invention relates to a measuring system and a measuring method of hydraulic cylinder characteristic. The technical solution is following: the oil outlet of the oil pump (9) is connected to the P hole of the electric liquid servo valve (13); A hole or B hole of the electric liquid servo valve (13) are connected to the non-rod cavity of the measured hydraulic cylinder (2); the rod cavity of the measured hydraulic cylinder (2) is connected to the tank (11); the measured hydraulic cylinder (2) is installed in a sealed frame (1); the measured hydraulic cylinder (2) is mounted with a displacement sensor (3); the displacement sensor (3) is electrically connected to the A/D-1 of the data collecting card (6); the A hole or B hole of the electric liquid servo valve (13) are electrically connected to the pressure sensor (4) connected to the measured hydraulic cylinder (2) and the A/D-1 of the data collecting card (6) of the pressure sensor (4); the data collecting card (6) and the computer assistant measuring software (5) are installed in the computer. The invention has the characteristics of simple structure, precise measurement and high level of automation.

The invention discloses a method for indirectly measuring the pretightening force of matched bearings and a measuring apparatus and relates to the technical field of bearing measuring. The invention adopts an indirect measuring principle, applies continuously increased coaxial loads on the matched bearings to be measured through stepless loading, monitors the load exerted on the matched bearings to be measured through a pressure sensor and then judges whether an inner ring and an inner isolating sleeve of the matched bearings are contacted or not through a displacement sensor. The measuring apparatus consists of the displacement sensor (1), an upper locating seat(2), an outer isolating sleeve (4), the inner isolating sleeve (5), a locating mandrel (6), an air main shaft (7), a loading cylinder (8), a pressure regulating valve(9), the pressure sensor (10), a pedestal (11), a pedestal top plate (12) and an electrical system. The adoption of the measuring method and the measuring apparatus solves the measuring difficulty on the pretightening force of the matched bearings, provides reliable detecting and analyzing data for the assembly and use of the bearings and improves the assembly parameters and technique of the bearing components according to the data and improves the overall performances of the bearing components.

A device for detection of a defined relative position of a first, movable means, relatively a second, fixed means and including a sensor (1) arranged at least at one of the first and second means which sensor is provided with a pressure sensing means (CCM). The sensor (1) gives rise to an electric detector signal, which indicates whether the defined relative position has been taken. The sensor (1) is also provided with a closed cavity (13) which communicates with a pressure sensing means (CM) and with means (14/36/45) to momentarily limit the volume of the cavity and thereby create a pressure pulse adapted to activate the pressure sensing means of the sensor. The detector device includes means to convert the pressure pulse to a detection signal to detect the defined relative position.

The invention discloses a similar material simulation test system and relates to an apparatus for measuring or testing force, stress and displacement, in particular to a test system for laboratories to simulate and monitor support load and displacement changes by the aid of similar materials during coal bed excavation. The similar material simulation test system is capable of obtaining real-time pressure and displacement of a support when the support interacts with surrounding rocks. The similar material simulation test system comprises a model support 1, at least one movable column 2, pistons 21, vertical columns 3, a first measuring cylinder 5, a second measuring cylinder 6, a radio-frequency capacitive liquid level transmitter 8 and a radio-frequency capacitive liquid level transmitter 9. The insides of the vertical columns 3 are mutually communicated to form a liquid accommodating cavity 4, liquid is arranged in the liquid accommodating cavity, the first measuring cylinder and the second measuring cylinder are higher than the pistons, a connecting tube 7 is communicated between the first measuring cylinder and the second measuring cylinder through side walls of the first measuring cylinder and the second measuring cylinder, the lower end of the first measuring cylinder is communicated with the liquid accommodating cavity 4 through a hose 41, and the two radio-frequency capacitive liquid level transmitter 8 and 9 are used for measuring the liquid level inside the two measuring cylinders.

A load cell includes a first element, a second element and a sensor measuring force between the first and second elements along a first axis. In some embodiments, lateral and angular decoupling is provided by the provision of a convex surface between the first and second elements. The convex surface is slidable relative to at least one of the first and second elements in a first direction perpendicular to the first axis.

The invention discloses an active pressure-bearing type positioning borehole stress meter and a use method thereof. The active pressure-bearing type positioning borehole stress meter comprises a columnar shell, wherein the columnar shell is full of grease oil; a piston is arranged at one end of the columnar shell; an elastic inductor is arranged at the other end of the columnar shell; a foil gauge is arranged on the elastic inductor; a rigid bearing piece is arranged on one side of the columnar shell; the rigid bearing piece is inserted into the columnar shell; the contact parts of the rigid bearing piece and the columnar shell are in sealing contact; and an angle sensor is fixed on the columnar shell. The active pressure-bearing type positioning borehole stress meter has an active pressure-bearing function, can timely judge a change rule of the stress, can dynamically quantitative monitor a stress change condition of a danger area during the whole process and can supply a reliable data to the forecasting and preventing for the impact danger. The stress change along a certain direction can be continuously observed according to a mounting position of the stress meter, so as to further confirm the direction of the force and conveniently and specifically prevent the rock burst.

The invention provides a force sensor device for measuring force when applying compressions or simulating applying compressions to a chest area of a person during cardiopulmonary resuscitation (CPR). More specifically, the device has the shape of a flat pad or similar with a top side and a bottom side, for being placed on a chest area of a man or manikin or on any feasible surface or object, preferably with the top side of the device facing up. The device comprises a volume that is filled with a liquid, the device is sufficiently high and rigid to maintain a distance between the top and bottom sides of the device when normal CPR compressions are applied on the device, and the device comprises at least one pressure sensor arranged with fluid contact with the liquid volume and in operative contact with means for force measurement as a function of liquid pressure that varies according to applied pressure during CPR.

A portable digital scale is foldable for ease of storage and transport. The scale includes a fluid-filled elastomeric bladder and electronic module disposed in a hard-sided case that is opened in use and folded to encase the bladder and electronic module during transport and storage. The electronic module includes a pressure sensor for detecting the fluid pressure in the bladder as a measure of the user's weight, and a user interface and digital display for displaying the weight and/or other parameters requested by the user. Preferably, the electronic module includes a memory device capable of storing multiple weight measurements and a data port for down-loading stored weight data to a personal computer or PDA for tracking weight variation of one or more users over time.

A ring shear apparatus for measuring a shear strength of soil samples. The ring shear apparatus considering a wall-slip effect including: an upper ring for forming a first accommodation portion having a ring shape in which soil samples are accommodated; a lower ring for forming a second accommodation portion that corresponds to the first accommodation portion of the upper ring and has a ring shape in which soil samples are accommodated, closely attached to a lower portion of the upper ring and rotatably installed relative to the upper ring; a rotating unit for rotating the lower ring relative to the upper ring; and a shear strength measuring sensor combined with the upper ring and for measuring a shear strength of the soil samples, wherein a plurality of protrusions that protrudes from the lower ring is formed on an inner circumferential surface of the lower ring along a circumferential direction of the lower ring in order to prevent the soil samples from being slid when the lower ring is rotated.

A tactile sensor comprises a sensing bladder in pneumatic communication with a first diaphragm side of a pneumatic diaphragm via a first fluid; the pneumatic diaphragm being actuatable by a displacement of the first fluid within the sensing bladder; the pneumatic diaphragm further comprising a second diaphragm side in fluid isolation from the first diaphragm side; the second diaphragm side being pneumatically biased against the first diaphragm side, and the second diaphragm side and the first diaphragm side of the pneumatic diaphragm each being in pneumatic communication with an external environment.

The present invention is the intermediate pressure test technology and apparatus for large caliber pipeline construction. The pressure test apparatus consists of one steel pipe, steel partition board welded inside the steel pipe, H-shaped by-pass pipe, water injecting pipe mounted onto the by-pass pipe, by-pass valve, exhaust valve pressure gauge. The pressure test apparatus is connected via union with the pipeline to be pressure tested, the pipeline is injected with water to test leakage, and after test, water is exhausted and the steel partition board, by-pass pipe, etc. are eliminated. The present invention needs no interruption of the construction during pressure test and can speed engineering construction.

The invention provides a device for testing force transmission characteristics of tunnellers in the technical field of tunnel engineering. The device comprises a base, a main top mechanism, a control mechanism, a hydraulic mechanism, a shield simulation mechanism and a load simulation mechanism, wherein the shield simulation mechanism and the load simulation mechanism are arranged on the base; the main top mechanism is connected with the shield simulation mechanism and the load simulation mechanism respectively; control mechanism is connected with the shield simulation mechanism and the hydraulic mechanism respectively; the hydraulic mechanism is connected with the load simulation mechanism and the shield simulation mechanism. The device can simulate various working conditions of shield machines in the tunneling process and qualitatively analyze the force transmission characteristics of shield-machine propulsion devices in the tunneling process so as to lay a foundation for compliance scheme design of the shield machines.

The invention discloses a visual uniformly-distributed hydraulic fracturing ground stress measurement device and a measurement method, which belongs to a ground stress measurement device and a measurement method. The method comprises steps: 1, a surrounding rock is selected for testing the ground stress; 2, a related drilling rig is used for carrying out construction and drilling on a coal-rock mass; 3, a device is mounted, and a hydraulic lifting device is used for lifting a hydraulic fracturing and monitoring device to a surrounding rock ground stress test section and to be fixed; 4, liquid injection and pressurization are carried out, an explosion-proof high-pressure pump is used for water injection and pressurization on a collar hose via a pressurization hose, ground stress measurement through indirect hydraulic fracturing is realized, and a pressure sensor and a camera are opened to monitor the stress changes and surrounding rock deformation; 5, the pump is closed, and when the collar hose continuously pressurizes on the surrounding rock until a surrounding rock crack to be completely fractured, and the high-pressure pump is closed; 6, pressure relief is carried out, and when the pressure in the ground stress test section tends to be stable, the pressure in the test section is released; and 7, the above steps from the fourth to the sixth are repeated for three to five times, stress parameters are obtained, the rock fracturing state and the crack extending state are judged, and the data are processed.

A hydraulic lifting and weighing system particularly for refuse collection vehicles and the like and includes means for dynamically weighing garbage. The system includes a hydraulic actuator operable to move a lifting arm and takes two measurements of the pressure of the hydraulic fluid in the system as the arm raises a waste bin whose weight is to be measured. The weight of the bin is calculated by multiplying the pressure by a factor determined by calibration with known weights. Weights are calculated based on the measurements of pressure and the result averaged. The system compensates for variations in hydraulic flow characteristics. The system includes means for compensating for variations in the inclination of the vehicle.

The invention relates to a pulling force tester for stayguy of a guyed tower. The tester comprises an upper clamp plate, a lower clamp plate, a spiral strainer, a hydraulic jack strainer, a pulling force sensor, a digital display gauge, rigging shackles, and the like, wherein an inner screw rod and an outer sleeve of the spiral strainer are in threaded connection with each other, the spiral strainer is connected on the left sides and the right sides of the upper clamp plate and the lower clamp plate, one end of the spiral strainer is connected with the hydraulic jack strainer which can be connected with the upper clamp plate or the lower clamp plate, the other end of the spiral strainer can be directly connected with the upper clamp plate or the lower clamp plate or by the pulling force sensor, the digital display gauge is connected on the pulling force sensor, and an oil pressure gauge is connected on the hydraulic jack strainer. The invention has the advantages that the tester is light and portable, can operate on the ground, needs less operating staff and can be taken out by just two users; and when used for testing the pulling force of the stayguy, the tester does not damage the stayguy, test data is accurate, test time is short, and one stayguy can be tested in 10 minutes.