101results about How to "Avoid bending moment" patented technology

A double-shaft high-low cycle complex fatigue tester comprises a hydraulic fatigue tester, an upper clamping head, a lower clamping head, an electromagnetic vibration exciter, a sample, a fixture, and a locating connecting device. The electromagnetic vibration exciter is connected with a middle clamping block 2 in the fixture via a cylindrical connector, a connecting rod and a U-shaped connector in a positioning connecting device; the middle clamping block 2 and a middle clamping block 1 are used for clamping a square mass boss at the middle part of the sample via a connecting piece, and the two ends of the sample are connected with a plywood in the fixture via the connecting piece; the plywood is connected with the connector in the fixture via bolts in the connecting piece; and the vertical ends of the connector are placed in the grooves of the upper clamping head and the lower clamping head of the hydraulic fatigue tester, contacted with the hydraulic fatigue tester, and clamped tightly via the hydraulic pressure of the tester. The tester is simple in structure and convenient to operate, solves the problems of load interference and load coordination in the vertical direction and the horizontal direction during bidirectional loading aiming at the plate-shaped sample, and can be used for simulating fatigue load borne by the blades of the rotor of a gas turbine engine.

The invention discloses a device for testing the shear strength of a joint of an external prestressing prefabrication and assembly concrete member. The device disclosed by the invention is characterized in that a first segment of the concrete member is arranged on a support, a hydraulic jack is loaded on the upper end face of a second segment of the concrete member; the cross section of the first segment of the concrete member is of an L shape, the cross section of the second segment of the concrete member is of an inverted L shape, the first segment of the concrete member and the second segment of the concrete member are assembled into a vertical joint, an upper horizontal plane joint and a lower horizontal plant joint by virtue of an external prestressing tension device, the upper horizontal plane joint and the lower horizontal plane joint are respectively connected with at least one vertically arranged displacement sensor in a bridging manner, and the vertical joint is connected with one group of displacement sensors horizontally arranged in a bridging manner; and the center connecting line of the support and the hydraulic jack is coincided with that of the vertical joint. The device disclosed by the invention has the advantages that the bending moment of a loaded concrete member can be avoided, pure shear loading is realized, the displacement sensors are arranged at the joint, double control on loading is carried out by virtue of a force and displacements, and the loading failure time can be timely known, so that the device disclosed by the invention has certain safety.

The invention relates to a horizontal wheel rail gnawing preventing device for a two-force rod system. The technical scheme is as follows: the device comprises four two-force rod mechanisms with the same size and structure, and the four two-force rod mechanisms are symmetrically fixed on four corners of a bridge girder (1). Each two-force rod mechanism is composed of a fixed frame set and a horizontal wheel set, wherein the fixed frame set comprises a box-shaped fixed frame (2), a pressing frame (3) and a compression spring (15); the horizontal wheel set comprises a horizontal wheel (4), a bearing (8), an eccentric transparent cover (9), an adjustable pad (10), a wheel axle (12) and a shaft sleeve (13). The box-shaped fixed frame (2) is fixed on web plates at two sides of the bridge girder (1); the pressing frame (3) slides inside the box-shaped fixed frame (2) through the compression spring (15); and the horizontal wheel (4) is fixed on the pressing frame (3) through the bearing (8), the wheel axle (12) and the eccentric transparent cover (9). By using the horizontal wheel rail gnawing preventing device, the precise guide for the operation of a crane is realized; and a track (5) is in flexible contact with the horizontal wheel (4), thus the wheel rail gnawing phenomenon is effectively avoided. The horizontal wheel rail gnawing preventing device has the characteristics of simple structure, easiness for maintenance, strong stability and long service life.

The invention relates to a loop heat pipe evaporator assembling tool and an assembling method mainly used for assembling an evaporator in a loop heat pipe and belongs to the technical field of two phase heat transmission of a loop heat pipe. According to the invention, on one hand, interference fit between a capillary core and a metal outer shell is realized, the situation that the capillary core does not crack after being mounted in the metal outer shell is ensured, the hot charging success rate is high, small-scale production can be met, the production cost is reduced, and the production efficiency is improved; and on the other hand, the surface of the capillary core is not scratched, powder does not fall off the surface of the capillary core, the product surface is free of oxidation and pollution, and the service life and the reliability of the product are prolonged and improved.

The invention discloses an evaluation method for jointed rock performance and bolting and grouting effects under a compression-shear condition. The method comprises the following steps that all factors influencing compression-shear performance of rock are determined, and an orthogonal test scheme is designed according to experience levels of all the factors; a tested part matched with a compression-shear testing machine is manufactured, and compression-shear testing is carried out; a monitoring system is utilized for monitoring the tested part, the whole fracturing process of the jointed rock is recorded, all the factors in monitoring data are analyzed, the specific value of corresponding rock mechanical parameters of a comparison set and a standard set serves as an evaluation index to carry out statistic analysis on the orthogonal test data to obtain the remarkable influencing factors of the compression-shear performance and obtain the parameter range of each related factor of optimal compression and shear resistance; the corresponding relation between different levels of all the remarkable influence factors and the evaluation index of the certain compression and shear resistance or the bolting and grouting effects is obtained, and design and implementation of the geotechnical engineering supporting and bolting and grouting scheme can be guided.

The invention discloses a wireless passive detection system for the tension of a high-voltage transmission line, and the system comprises a tension sensor, a clamping and tension transmission mechanism, and a wireless reader. The tension sensor is installed at a to-be-detected part of the high-voltage transmission line through the clamping and tension transmission mechanism, and is in signal transmission connection with the wireless reader. According to the invention, the system employs a surface transverse wave strain sensitivity theoretical model, integrates the strain sensitivity and a frequency temperature coefficient, and is provided with the dedicated clamping and tension transmission mechanism for measuring the tension of the high-voltage transmission line, wherein the clamping and tension transmission mechanism can be conveniently installed at any detected point on the transmission line, and can prevent the bending moment and torque from affecting the measurement of tension. The wireless reader is used for remotely querying the frequency shift of an STW resonator installed on the transmission line, i.e., obtaining the tension value of a detected point. The wireless reader can be installed on a mobile platform, and can achieve the routing inspection of a surface transverse wave tension sensor at a place which is 10m far.

The invention provides an instruction car control system. The system comprises a main pedal mechanism and an auxiliary pedal mechanism, wherein each of the main pedal mechanism and the auxiliary pedal mechanism contains a pedal arm, the main pedal mechanism and the auxiliary pedal are connected through an inhaul cable; each pedal mechanism contains pedal planetary rotating shafts arranged on the pedal arm rotatably, and the two ends of the inhaul cable are separately connected with a main pedal planetary rotating shaft and an auxiliary pedal planetary rotating shaft. The invention also provides an instruction car containing the instruction car control system. By using the instruction car control system of the invention, when pedals pivot, the planetary rotating shafts arranged on the pedals rotate at the same time, namely the trajectory is similar to that of planets. Therefore, the inhaul cable installing holes of the planetary rotating shafts are automatically adjusted to always align with the inhaul cables and the extension directions of the inhaul cables can not change suddenly so that the inhaul cables can not bear bending moment and torsional moment and the service life of the inhaul cables can be prolonged.

A connecting system of a side member for a vehicle includes a member connecting member configured to connect a center side member and a rear side member provided at a floor of the vehicle in a length direction. The center side member, the rear side member, and a side sill are connected to one another through the member connecting member so as to improve frame rigidity and the center side member. The rear side member, the side sill, and the member connecting member are connected to a rear trailing arm mounting part, such that a moment occurrence is prevented and deformation of a car body is minimized to increase durability and to secure a battery mounting space, thereby making it possible to easily configure the layout.

The invention discloses a track beam setting up device and method, and belongs to the technical field of elevated and bridge construction, in order to solve the problem of poor positioning accuracy of track beam lifting. The device comprises a first upper frame and a second upper frame, wherein the first upper frame is arranged at the end of a track beam already mounted in place, and the second upper frame is arranged at the end of a to-be-mounted track beam and is butted against the first upper frame. The second upper frame drives the to-be-mounted track beam to move towards the direction away from the first upper frame under pushing of a hydraulic jack of the first upper frame. The method includes: lifting the to-be-mounted track beam to a place through a large-sized crane, controlling the spacing between the to-be-mounted track beam and the track beam already mounted in place to be 30mm</=d<50mm, then mounting the first upper frame, the second upper frame and the hydraulic jack, when a lifting hook is not loosened completely, starting the hydraulic jack to push the second upper frame to drive the to-be-mounted track beam to move, measuring d manually, and stopping the hydraulic jack when d=50mm. The device is high in mounting and positioning accuracy, convenient to operate, simple in structure and low in production cost.

The invention discloses a rotatable double-layer plate tensile test device. The device comprises two force application seats which are oppositely arranged, and the force application seats are rigid bodies. Each force application seat comprises a base and a fixed end, each fixed end is connected with one end of the corresponding base, each fixed end can be connected with a tensile testing machine,clamping assemblies are arranged at the tops of the bases, the number of the clamping assemblies is consistent with that of the force application seats, the clamping assemblies correspond to the forceapplication seats one to one, and the clamping assemblies are rotationally arranged on the bases. Each clamping assembly comprises a sample table and a cover plate, the sample tables are rotationallyconnected with the bases, a sample is arranged between the cover plates and the sample tables, and bonding layers are arranged between the sample tables and the sample and between the cover plates and the sample. Machining such as punching and grinding on the sample is avoided, sample crushing caused by too tight clamping of the sample or sample slipping caused by too loose clamping of the sampleis avoided, the rotatable sample tables and the cover plates are used for clamping the upper face and the lower face of the sample, and meanwhile the bonding layers are arranged, so that the brittlerock sample is not affected by bending moment in any direction.

The invention relates to the technical field of building construction, in particular to a multi-angle rotating spherical hinge support system for a building steel grid structure. The multi-angle rotating spherical hinge support system for the building steel grid structure comprises an embedded part, a support is fixedly mounted on the embedded part, a rotating groove is formed in the support, a central shaft is fixedly mounted in the rotating groove, a movable seat is movably connected to the interior of the rotating groove; a sliding groove is formed in the support, a first magnetic block isfixedly mounted in the sliding groove, a limiting plate is mounted in the sliding groove in a sliding mode, a second magnetic block is fixedly mounted on the limiting plate, and a guide wheel is fixedly mounted on the movable seat. by using the embedded part and the support as structural bases, and mounting the adjustable movable seat and an adjustable rotating disc on the embedded part and the support to serve as connecting components, excessive bending moment and torque can be prevented from being generated in the structure, concentrated stress is eliminated, and the safety of the structureis protected; and meanwhile, as a magnetic reset structure is arranged in the movable seat and a spring return structure is mounted on the rotating disc, the structural stability can be guaranteed.

The invention relates to a drop-off connector and a drop-off connector assembly. The drop-off connector assembly comprises a plug having a front end as a plug end and a socket. The plug comprises a plug housing, a locking connection cap sleeves a plug housing. The locking connection cap is provided with a pushing structure for pushing the plug housing backwards when the locking connection cap moves backward to realize separation of the plug and the socket, and the front end of the locking connection cap is provided, the front end of the locking connection cap is provided with a pull cord connecting lug for connecting a pull cord so that the pull cord can pull the locking connection cap back. A pull cord connecting lug is arranged at the front end of the locking connection cap to facilitatethe connection of the pull cord. The application point of the pulling force applied by the pull cord to the locking connection cap is also located at the front end of the locking hood, so that the bending moment caused by the pulling force of the pull cord on the plug is always zero. The problem that the locking hood and the socket are self-locking and cannot be separated under the large tiltingpulling force is solved.

The invention discloses a micro-welding-spot creep life testing device and a using method thereof.The micro-welding-spot creep life testing device comprises a supporting assembly, a clamping assemblyand a measuring assembly, wherein a base, a lower supporting frame and an upper supporting frame of the supporting assembly are connected in sequence, a first clamp holder and a second clamp holder ofthe clamping assembly are slidably connected with the upper supporting frame and the lower supporting frame respectively, a hanging ring of the measuring assembly is installed on the second clamp holder, a liquid weight is connected with the hanging ring through a hanging rope, the testing system is installed on one side of the base. A test sample is fixed by means of the first clamp holder and the second clamp holder, then the liquid weight with preset weight is hung, and after the test sample is broken, the liquid weight triggers an infrared sensor in a test system to obtain the creep lifeof the test sample. The micro-welding-spot creep life testing device is simple in structure, can be used for testing a micro welding spot sample with the diameter of 0.51 mm, and is higher in precision compared with a traditional uniaxial tension testing method, so that the testing cost can be reduced.

The present invention relates to a band wheel unloading device for impact sand-making machine. It can reduce, even prevent main shaft from producing bending moment by band wheel, so that it can further reduce cost. The described band wheel at least has two coaxial axial inner holes which are different in inner diameter in which one end close to bearing seat is an axial inner hole whose inner diameter is larger, another end is cover-mounted on the main shaft by means of tight fit. The described band wheel unloading device includes unloading sleeve, said unloading sleeve is cover-mounted on main shaft, one end of said unloading sleeve is fixed on the bearing seat, its another end is positioned in the axial inner hole whose inner diameter is larger and is connected with said band wheel by means of bearing.

The invention provides a self-centering anti-bending and anti-twisting high-temperature clamp capable of bearing the axial tensile load, the elliptic ball head of the rotary support is in contact fitwith the curved surface of the ellipsoidal cavity of the force bearing block, so that the relative sliding and rotating functions of the elliptic ball head of the rotary support and the ellipsoidal cavity of the force bearing block can be realized; when the coaxiality of the testing machine, the clamp and the to-be-tested sample is inconsistent, the coaxiality of the loading line can be automatically achieved through coordination of sliding and rotating, meanwhile, unexpected bending moment and torque are effectively avoided, a large amount of coaxiality centering work is saved, and the test efficiency is effectively improved. In addition, transition clamps containing different pin holes and internal threaded holes can be designed for flat plate samples with different thicknesses and roundrod samples with different diameters to carry out high-temperature tests, and simplicity, convenience and flexibility are achieved.

The invention provides a hydrodynamic retarder. The hydrodynamic retarder comprises a turning wheel and a fixed wheel, wherein blades of the turning wheel and the fixed wheel are U-shaped and are arranged along the radial directions of the turning wheel and the fixed wheel; the U-shaped blades of the turning wheel and the fixed wheel are arranged in opposite directions; oil fluids in an inner ring and an outer ring of a hydrodynamic circulating cavity are fully centralized to a place with the largest axial hydrodynamic circulating circle for impacting and stirring; the front end of each blade is thin and the middle part of each blade is thick; a taper oblique angle is formed at the front end of each blade; the upper surface of each blade is an arc-shaped; the semicircular arc-shaped surface on the upper surface of the two U-shaped blades arranged in opposite directions forms another circulating circle between the turning wheel and the fixed wheel; stirring circulating impact can be carried out on the upper part of the blade to further enhance mutual impact of liquid flow; the casting connection area between the U-shaped blades, the fixed wheel and the turning wheel is large; the two sides of eawch blade are similar to two support ribs so as to enhance the rigidity of the blades; the structure is firm and unlikely to be damaged; and by increasing the diameter of the circulating circle, the axial size of the whole transmission is reduced, the occupation space is small, and the casting difficulty is low.

The invention discloses a construction process of a cable crane hoisting system, and belongs to the field of bridges. The construction process comprises the following steps of step (1), respectively carrying out the construction of foundation embedded parts of towers on both sides on transition piers on both sides of a bridge, and then assembling the towers on both sides and installing wind cableson the corresponding towers; step (2), installing cable saddles on the tops of the towers on both sides, and carrying out the construction of main anchors on both sides; step (3), installing a main bearing cable and installing a winch at the same time; step (4), carrying out the installation of a lifting trolley, a traction rope and a hoisting rope; and step (5), carrying out hoisting system inspection and trial hoisting. According to the scheme of the invention, the towers are erected on the tops of the bridge transition piers, the span of a cable system is reduced and the height of the towers is reduced; and the arrangement not only greatly saves the construction cost and speeds up the construction progress, but also ensures the construction safety of a cable crane used in a large-span,variable cross-section steel truss continuous rigid frame bridge, and the hoisting construction process is simple.

A hook type connecting and unlocking device comprises an upper end frame (1), a rotating block (2), a rolling shaft (3), a base (4), an internal supporting ring (5), a lower end frame (6), a motor assembly (7), connecting rods (8) and a roller (9), wherein the upper end frame (1) and the lower end frame (6) are separately fixedly connected to two structures (10 and 11) to be connected and unlocked; a groove is formed in the upper end frame (1); the lower end frame (6) is fixedly connected with the base (4); one end of the rotating block (2) is connected to the base (4) through the rolling shaft (3); a projection is arranged on one side of the other end of the rotating block (2); the shape of the projection is matched with that of the groove; a slot is formed in the other side of the otherend of the rotating block (2); the internal supporting ring (5) is placed in the slot and is connected with the motor assembly (7) through the connecting rods (8); and under the driving effect of themotor assembly (7), the projection on the rotating block (2) rotates around the rolling shaft (3) to enter the groove of the upper end frame (1) or leave away from the groove of the upper end frame (1) through expansion and shrinkage of the internal supporting ring (5), and thus, locking and releasing of the two structures (10 and 11) are realized.