47results about How to "Improve stress condition" patented technology

The invention relates to a wide-view C-shaped arm X-ray machine and an imaging method thereof.The wide-view C-shaped arm X-ray machine comprises a main machine, a C-shaped arm, an X-ray source, a flat panel detector, a first telescopic mechanism, a first translation mechanism and a first swing mechanism, the first telescopic mechanism is arranged at one end of the C-shaped arm and used for driving the first translation mechanism and the flat panel detector to stretch out and draw back, and the first swing mechanism is arranged at the other end of the C-shaped arm and used for driving the X-ray source to swing. The first translation mechanism is arranged on the first telescopic mechanism and used for driving the flat panel detector to translate, and the first swinging mechanism is arranged at the other end of the C-shaped arm and used for driving the X-ray source to swing so as to follow the position of the flat panel detector, so that X-rays emitted by the X-ray source can fall on the flat panel detector. The flat panel detector can move to different imaging positions to obtain images at different positions, and the images are synthesized into a larger image, so that the area of an imaging region is greatly increased, the observation view of a doctor is expanded, and the efficiency and safety of an operation are improved.

The utility model relates to the technical field of press-fit tool mechanisms, in particular to a press-fit tool mechanism based on sensor assembly. According to the technical scheme, the device comprises a base and a pressing device fixedly installed on the base, and further comprises a continuous feeding mechanism installed on the base, a plurality of bearing plates used for placing sensors are installed on the continuous feeding mechanism, a finished product box is installed below the base, and the finished product box is installed on the base. The finished product box is used for storing the sensor which passes through the pressing device and is turned over for one time, and the supporting mechanism is installed on the base and located below the pressing device. According to the utility model, the bearing plate is turned over twice, the processed sensor can be moved into the finished product box under the action of gravity and does not need to be manually taken out, the bearing plate can be turned over again, and the turned bearing plate can bear the sensor again, so that the sensor can be continuously subjected to press-fit, and the production efficiency is improved. And the production efficiency can be effectively improved.

The invention provides a curved beam bridge anti-overturning device utilizing a pulley block and an adjusting rod. The curved beam bridge anti-overturning device mainly comprises a steel strand, a fixed pulley, a movable pulley, a supporting rod, the adjusting rod, a steel sleeve, a limiting block, an anchor rod, an anchor ring, an anchoring block, a gasket, an anchor hole, a bolt, a hexagon head and a screw rod. By tensioning the steel strands and combining the pulley blocks, the device can effectively optimize force transmission in the beam body. Meanwhile, the arranged supporting rods can effectively restrain transverse displacement of the curved bridge and resist overturning moment of a single curved bridge. The two ends of the adjusting rod are connected with the supporting rod and the steel strand respectively, and efficient transmission and optimization of force between the supporting rod and the steel strand are achieved through the lever principle. When the curved bridge is subjected to eccentric load or dynamic load, the mutual connection of the structures can obviously optimize the force transmission in the bridge body and effectively restrain the transverse displacement of the bridge, so that the anti-overturning capability of the curved bridge is enhanced. The device provides an innovative solution for improving the safety of the curved bridge under the action of eccentric load or dynamic load.

The present invention relates to the field of centrifuge structure, and specifically discloses a roll frame for a high-g value three-degree-of-freedom centrifuge, comprising a frame, wherein the frame is an octagonal annular cavity surrounded by an outer skin outer ring, an inner skin inner ring and a cover plate; the frame is symmetrically provided with two roll axis mounting holes, wherein a small shaft sleeve is provided in the roll axis mounting hole, and the side wall of the frame perpendicular to the line connecting the two roll axis mounting holes is provided with two pitch axis mounting holes, wherein a large shaft sleeve is provided in the pitch axis mounting hole; and a plurality of threading tubes are provided in the cavity between the outer skin and the inner skin. The advantages of the present invention are that the roll frame's outer shape structure, box cross-sectional structure, local structure and wiring method are improved and designed to improve the roll frame's overload resistance, rigidity and load-bearing capacity, and reduce the eccentricity of the roll frame, so that it can be used in a high-g value three-degree-of-freedom centrifuge.

The utility model discloses a high-speed powder mixer, which relates to the technical field of mixers, and comprises a rack, a support plate is arranged outside the rack, support pieces are arranged at the top of the support plate, a turnover shaft is rotatably arranged between the two support pieces, a mixing tank body is arranged on the turnover shaft, and the mixing tank body is provided with a plurality of stirring blades. A high-speed motor and a wall scraping motor are arranged outside the mixing tank body, the high-speed motor is connected with a shear knife, cavities are formed in the two ends of the overturning shaft, a cable is arranged in the cavity in one end of the overturning shaft, a communicating pipe is arranged in the cavity in the other end of the overturning shaft, and the communicating pipe is connected with a water pipe and an oil pipe on the tank body. The supporting structures at the two ends greatly increase the structural strength of the overturning shaft, the stress condition of the overturning shaft is greatly improved, the bearing capacity of the overturning shaft is increased, the abrasion and fatigue conditions of the bearings are improved, the service life of the bearings is prolonged, and the supporting structures at the two ends guarantee the stability of the whole equipment during high-speed operation.

The utility model discloses a distributed tension and compression composite anchor cable, and belongs to the technical field of anchor cable reinforcing devices. The anchor cable comprises three bundles of anchor cables, one bundle of anchor cables is composed of seven steel strands, and bearing plates are arranged at the 1 / 4 position, the 1 / 2 position and the 3 / 4 position of each anchor cable respectively and serve as centering supports. By arranging the anchor cables and the bearing plate with different lengths, the original concentrated stress at the end part is reasonably distributed, and the concentrated stress at the end part is transferred to the bearing plate through the casing pipe isolation slurry, so that the pressure and the pulling force act together. According to the distributed tension-compression composite anchor cable, stress dispersion and stress decomposition can be effectively carried out on concentrated stress borne by the anchor cable, the stress condition of the anchor cable can be remarkably improved, the stress concentration damage phenomenon is reduced, the using amount of the anchor cable is reduced, the manufacturing cost can be saved, and safety and environment friendliness are achieved.

The utility model discloses an elastic tailstock structure for a worm grinding wheel gear grinding machine, which comprises a sliding plate body and a servo driving mechanism, the sliding plate body is arranged on the gear grinding machine in a sliding manner, the servo driving mechanism is used for pushing the sliding plate body to slide, and the sliding plate body is provided with a Morse taper tip which is used for contacting a gear to abut against the gear; the servo driving mechanism comprises a servo motor and a ball screw connected with the driving end of the servo motor, a nut of the ball screw is matched with an upper gland on the sliding plate body through a crimping assembly, and a first elastic assembly used for transmitting pressure of the servo driving mechanism is arranged between the upper gland and the sliding plate body; a screw rod of the ball screw is arranged in the sliding plate body in a penetrating manner; a second elastic component for balancing the overall gravity of the sliding plate body is arranged at the end part of the screw rod of the ball screw; the first elastic assembly is used for absorbing and storing pressure for pressing workpieces, rotation of the ball screw can be adjusted according to needs for the workpieces with different materials, hardness and machining requirements, so that the pressure of the spring is adjusted, and finally the pressing force is adjusted.

The invention belongs to the technical field of cable installation, and particularly relates to a cable connector which comprises an outer pipe, paired cylinder caps, a holding piece, a tightening cylinder, a spiral ring, a spring and an inner pipe. The cylinder caps are fixed at two ends of the outer tube. The holding piece comprises a ring body, a plurality of pressing arms and rubber pads arranged on the pressing arms. The outer side faces of the pressing arms are wedge-shaped curved surfaces, and the multiple wedge-shaped curved surfaces can be distributed on the same conical surface. And the tightening cylinder is sleeved on the holding piece, and an inner conical surface is formed at the end part of a cylinder cavity of the tightening cylinder. The spiral ring is matched with the ring body and can push the tightening cylinder to move, so that the inner conical surface pushes and presses the pressing arm to be folded in the direction close to the axis of the holding piece. The spring is arranged on the free end side of the ring body and can exert elastic thrust on the enclasping piece. The inner pipe is arranged between the holding pieces, and the two ends of the inner pipe are fixedly connected with the pressing arms on the two holding pieces respectively. And the electric connector is arranged in the tube cavity of the inner tube. According to the invention, the stress condition of the electric connector can be improved, and the connection stability and reliability of the cable at the electric connector can be improved.

The present invention discloses an offshore assembled pontoon adopting a rigid connection device, the offshore assembled pontoon comprises a first pontoon, a second pontoon, a longitudinal socket and a longitudinal plug; a longitudinal socket is fixedly installed on one side surface of the first pontoon, and a longitudinal plug accommodation space is formed between two adjacent longitudinal sockets; the longitudinal socket is provided with a plurality of first connection holes on the side facing the accommodation space; a longitudinal plug is fixedly installed on one side surface of the second pontoon; first latches are provided on both sides of the longitudinal plug; the first latch can enter a retracted state from an extended state when subjected to an external force; when the first latch is in an extended state, the first latch is plugged into the first connection hole; when the first latch is in a retracted state, the first latch retracts into the inner side of the longitudinal plug. The above-mentioned offshore assembled pontoon can adapt to complex sea conditions, can realize automatic preliminary docking, reduce the difficulty of operation, and improve the stress condition of the pontoon.

The present invention discloses a technical field of water seal systems for sluice gates, specifically a telescopic water seal system for sluice gates, comprising a gate, with a water front panel and a water back panel on both sides of the gate, first protrusions extending from both ends of the water front panel, a first energy dissipation block being arranged on the side of the first protrusion, and second protrusions extending from both ends of the water back panel; a gate groove being arranged on both sides of the gate, a mortise being formed between the gate groove and the gate, a second energy dissipation block being arranged on the side of the gate groove, and the second energy dissipation block corresponding to the front and rear positions of the first energy dissipation block; a first water seal being arranged in the mortise and used for sealing the mortise with water; the system can not only enhance the overall stability of the gate under high water head and reduce the vibration generated under the action of water load, but also weaken the water flow rate between the gate and the gate groove.

The invention discloses a drill pump multi-drag-one reduction gearbox which comprises a shell, a large gear and a gear shaft are arranged in the shell and meshed to form a gear pair, a motor mounting flange seat, a reduction gearbox mounting flange and a large gear supporting cover are fixed to the shell, and the large gear supporting cover is located on the outer side of one end face of the large gear. The two shaft ends of the large gear are provided with large gear supporting bearings, the shaft diameters of the two shaft heads of the gear shaft are unequal, and the two shaft heads of the gear shaft are provided with an input shaft supporting bearing I and an input shaft supporting bearing II respectively. According to the invention, the stress conditions of a gear pair, a supporting bearing and the like in the reduction gearbox are improved, and the universality of the reduction gearbox and the driving motor is also remarkably improved for drilling pump sets with different powers and different power requirements of the drilling pump sets.

The invention discloses a construction method for a complex surrounding rock section of a shallow-buried unsymmetrical-pressure double-hole large-span tunnel. The technical purpose of reducing the surrounding rock deformation risk in the tunnel excavation process is achieved. Comprising the following steps: performing surrounding rock pressure distribution analysis on the surrounding rock section, and drawing a pressure distribution field; performing integral grouting reinforcement on the surrounding rock section, wherein the reinforcement degree of the integral grouting reinforcement on the surrounding rock section is in gradient distribution from weak to strong according to the distribution condition of the pressure in the pressure distribution field from large to small; and after the integral grouting reinforcement is completed, tunnel excavation construction is carried out. The low-pressure area which is easier to deform is strengthened in a more targeted manner, so that the deformation of the surrounding rock is more effectively controlled, and the deformation risk of the surrounding rock in the tunnel excavation process is effectively reduced; according to the differentiated grouting reinforcement mode, resource distribution is optimized, excessive reinforcement of the high-pressure area is avoided, materials and construction cost can be saved, and unnecessary disturbance to the surrounding environment is reduced.

The present invention provides a demoulding machine for high-speed rail track plates, including a working platform installed on a main frame, on which two groups of lifting units and two groups of stretching units are symmetrically installed; a horizontal moving device is provided on the working platform corresponding to each group of stretching devices, and the horizontal moving device includes a crossbeam and a horizontal driving mechanism that drives the crossbeam to move; each group of the stretching units includes two stretching devices symmetrically arranged on the crossbeam. The demoulding machine provided by the present invention is suitable for a track plate production line of a flow unit method, and can be directly installed on the production line, which can realize demoulding and transfer of the track plate, save manpower, and improve production efficiency. In addition, the vertical demoulding of the track plate and the steel mold is guaranteed to the maximum extent, avoiding damage to the track plate and ensuring the quality of the track plate. At the same time, the demoulding machine has a good stress condition, which can effectively protect the demoulding machine and avoid damage to its structural parts.

The heat-conducting resin sheet according to an aspect of the present invention comprises a thermally conductive plate-shaped particle, a thermally conductive spherical particle, and a resin, wherein the heat-conducting resin sheet has a thermal conductivity of 5 W / m.K or more and a 30% compressive strength B of 1500 kPa or less as measured at a compression rate of 1.0 mm / min. Furthermore, a volume ratio of the thermally conductive plate-shaped particle to the thermally conductive spherical particle (volume of thermally conductive plate-shaped particle / volume of thermally conductive spherical particle) is 30 / 70 to 90 / 10, and the total volume of the thermally conductive plate-shaped particle and the thermally conductive spherical particle is 30 to 90 % by volume. According to the present invention, there can be provided a heat-conducting resin sheet that is excellent in the thermal conductivity and flexibility and can suppress the increase in the stress even when compressed quickly.

The invention belongs to the field of building appliances, and particularly relates to a building formwork support and a detection mechanism thereof. The positioning assembly comprises a first sliding base, a second sliding base and a pair of positioning plates, wherein the first sliding base and the second sliding base are matched with vertical arms arranged on the left side and the right side of the base body. And a hoop I and a hoop II which are matched with each other are arranged on the two sliding seats. And the two positioning plates are respectively arranged on the two vertical arms and are correspondingly matched with the two sliding seats. A first vertical plate is arranged on the first sliding seat, and a second vertical plate is arranged on the second sliding seat. And the two vertical plates are arranged between the two vertical arms. A plurality of smooth through holes matched with the smooth columns are formed in the lower portion of the first vertical plate. A transverse plate is arranged on the lower portion of the second vertical plate. One end of the smooth column is fixedly connected with the transverse plate, and the other end is inserted into the smooth through hole. An elastic layer is fixedly arranged on the upper end face of the transverse plate. The stress condition of the lower portion of the supporting rod can be optimized, the firmness and reliability of fixing of the lower portion of the supporting rod can be improved, and the capacity of restraining the situation that the vibration amplitude is too large is improved.

The invention belongs to the technical field of rail transit equipment, and provides a multi-stage damping spring floating slab ballast bed and an adjusting method, and the multi-stage damping spring floating slab ballast bed comprises a floating slab, an underneath type vibration isolator, a side type vibration isolator, a first rigidity adjusting device, a second rigidity adjusting device, a base, a drainage ditch and a shear hinge device. Compared with a common spring floating slab, the structure has lower dynamic stiffness, but static stiffness is not reduced, and the bearing capacity is guaranteed while the vibration reduction effect of a track system is improved. And the track structure has certain transverse rigidity, so that the stress condition of the track structure in a curve section is obviously improved. And ultralow-frequency vibration reduction within 10 Hz can also be achieved, and the phenomenon of low-frequency vibration amplification of a traditional spring floating slab is restrained.

A four-branch three-degree-of-freedom parallel motion platform comprises a fixed platform, a movable platform, a first driving branch chain, a second driving branch chain, a third driving branch chain and a just constraint branch chain, the first driving branch chain, the second driving branch chain, the third driving branch chain and the just constraint branch chain are arranged between the fixed platform and the movable platform, and the first driving branch chain and the third driving branch chain have the same structural form and are connected through two connecting rods through cylindrical pairs, rotating pairs and universal hinges. The second driving branch chain is formed by connecting a cylindrical pair and two revolute pairs through two connecting rods, and the right constraint branch chain is formed by connecting a moving pair and the cylindrical pair through a connecting rod. The three driving branch chains respectively and independently control the movement of the movable platform, so that the movable platform can rotate in one direction and move in two directions, complete decoupling of three spatial degrees of freedom is realized, kinematics and dynamics modeling is easy, and the three-degree-of-freedom parallel mechanism has the characteristics of simple structure, easiness in control and the like; the rigidity, the bearing capacity and the stress condition of the mechanism can be obviously improved through the designed just-constrained branched chains, and the mechanism can be applied to the fields of various motion simulators, medical instruments, target tracking and the like.

The utility model discloses a temporary finger-shaped plate for a straddle type rail transit operation maintenance period, which relates to the technical field of finger-shaped plates, and comprises a first finger-shaped plate and a second finger-shaped plate, the second finger-shaped plate is fixedly installed on the working face, close to the gap, of the adjacent non-maintenance track beam, the first finger-shaped plate is located at the position close to the gap and not stretching out of the gap, and the second finger-shaped plate extends across the gap to the position of the first finger-shaped plate and is attached to the surface of the first finger-shaped plate to form a simple supporting state. And an elastic base plate is fixedly arranged between the bottom of the second finger-shaped plate and the track beam. The second finger-shaped plate can be borne by an anchor bolt on a non-maintenance track beam, the second finger-shaped plate and the first finger-shaped plate can form a simple supporting state, the stress condition is good, and it is guaranteed that the maintained anchor bolt on the maintenance track beam cannot be damaged due to premature pulling force.

A centrifugal fan capable of improving the stress condition of a bearing comprises a main shaft, an impeller and a volute, the volute comprises an air duct bent plate provided with an air outlet, the two sides of the air duct bent plate are covered with an air inlet side plate and a transmission side plate respectively, an air inlet is formed in the air inlet side plate, and the main shaft is arranged in a through hole of the transmission side plate in a penetrating mode and connected with the impeller. The main shaft is sleeved with a sealing shaft disc, the sealing shaft disc and the transmission side plate form a transmission side cavity through a comb tooth sealing structure, then the transmission side cavity is communicated with a low-pressure air inlet area of the air inlet through an air guide pipe, and a low-pressure balance area can be formed in the transmission side cavity relative to a high-pressure air outlet area in the volute. The pressure difference between the low-pressure air inlet area and the high-pressure air outlet area can generate axial force towards the air inlet side plate on the impeller and the main shaft, the pressure difference between the two sides of the sealing shaft disc can generate axial force towards the transmission side plate on the sealing shaft disc and the main shaft, the two axial forces are opposite in direction, the stress condition of the bearing is remarkably improved, the service life of the bearing is prolonged, and the service life of the bearing is prolonged. And the fan failure rate is reduced.

The present invention relates to a split transposition device for a double-circuit pole tower and an installation method thereof, comprising a main tower, wherein the main tower is provided with an upper cross arm, a middle cross arm and a lower cross arm, a middle phase-to-upper phase jumper is provided between the upper cross arm and the middle cross arm located at the same side end, a lower phase-to-middle phase jumper is provided between the middle cross arm and the lower cross arm located at the same side end, auxiliary towers are provided on both sides of the main tower, the auxiliary tower is provided with an upper cross arm and a lower cross arm near the main tower side, and an upper phase-to-lower phase jumper is provided between the upper cross arm and the lower cross arm. The device has simple wiring and controllable jumper gap; it reduces the height of the iron tower or the length of the cross arm, thereby reducing the torque and bending moment of the ground wire on the iron tower, improving the stress condition of the iron tower, and improving the reliability of the iron tower.

The invention discloses a steel billet transfer protection goods shelf and a frame assembly, and belongs to the technical field of steel billet transfer. The heat insulation structure comprises a heat insulation layer, and a plurality of high standing column assemblies are arranged on the heat insulation layer in the length direction of the heat insulation layer; the high standing column assembly comprises a plurality of limiting supporting frames distributed at intervals, and the adjacent limiting supporting frames are connected through connecting pieces in a welded mode. The limiting support frame is integrally formed by cutting a steel plate, and a limiting space is formed on the inner surface of the limiting support frame; the limiting spaces of the multiple limiting supporting frames jointly form a containing space for containing steel billets to be conveyed. Wherein the placing space can be a U-shaped rectangular space, a U-shaped arc-shaped space or a wave-shaped space formed by a plurality of grooves; and each groove of the wave-shaped space consists of at least two arc surfaces with different curvatures. According to the steel billet transfer protection goods shelf, light weight and high strength can be both considered; and the steel billet transfer trolley is suitable for transferring steel billets of different specifications.

An object of the present invention is to provide a radiation curable pressure-sensitive adhesive sheet with excellent storage stability, which can suppress the progress of curing during storage and maintain excellent level difference absorbability and stress relaxation properties for a long time. A radiation curable pressure-sensitive adhesive sheet 1 of the present invention has a pressure-sensitive adhesive layer 10 that is cured by irradiation with radiation. The pressure-sensitive adhesive layer 10 contains a photopolymerization initiator 11a and a crosslinking agent 11b, and the curing by irradiation with radiation is curing by a reaction between the photopolymerization initiator 11a and the crosslinking agent 11b. In the radiation curable pressure-sensitive adhesive sheet 1 of the present invention, the photopolymerization initiator 11a has a pKa of 5 to 12.7.

An object of the present invention is to provide a radiation curable pressure-sensitive adhesive sheet with excellent storage stability, which can suppress the progress of curing during storage and maintain excellent level difference absorbability and stress relaxation properties for a long time. A radiation curable pressure-sensitive adhesive sheet 1 of the present invention has a pressure-sensitive adhesive layer 10 that is cured by irradiation with radiation. The pressure-sensitive adhesive layer 10 contains a photopolymerization initiator 11a and a crosslinking agent 11b, and the curing by irradiation with radiation is curing by a reaction between the photopolymerization initiator 11a and the crosslinking agent 11b. In the radiation curable pressure-sensitive adhesive sheet 1 of the present invention, when the pressure-sensitive adhesive layer 10 is stored at 50°C for 4 weeks, a rate of change in residual stress (N / cm2) expressed by the following equation is 70% or less. Residualstresschangerate%=residualstressafterstorageat50°Cfor4weeks−initialresidualstress / initialresidualstress×100

Disclosed are a bending boom, a boom device and a work machine. The bending boom includes a middle portion (100) and two extending portions (200). The middle portion (100) is configured to connect external components. The extending portion (200) has a first side wall (210) and a second side wall (220) opposite to the first wall (210). The first side wall (210) is flush with middle portion (100), and the second side wall (220) is bent from middle portion (100) towards a direction near first side wall (210). Two extending portions (200) are connected to two opposite ends of middle portion (100). By providing the matching middle portion (100) and extending portions (200), a situation in which stress concentration occurs at the middle portion (100) can be prevented, which improves stress condition of the bending boom, and improves durability of the bending boom, the boom device and the work machine.

The invention discloses an ultra-long distance artillery projectile outlet initial speed test system, which comprises a plurality of net targets, a test circuit, an acquisition system and a computer, and is characterized in that the net targets are arranged on a flight path of a projectile flying out of an artillery outlet, and the plurality of net targets are arranged in parallel; each mesh target comprises two channel steels which are arranged in parallel, and a target screen mesh formed by weaving a whole target wire is arranged between the channel steels; the position of the net target is fixed through a fixing frame; connecting the two ends of a target wire in each net target into a test circuit, monitoring the voltage change condition of the two ends of a detection resistor in the test circuit by using an acquisition system, and connecting an acquired voltage signal and corresponding time into a computer; after the projectile is shot from the artillery, the target wire meshes in the mesh target are cut off one by one in the flying process, so that the voltage at the two ends of the detection resistor in the test circuit changes; and the speeds of the ultra-long-distance artillery projectile outlet at different stages are calculated by using the distance between the adjacent net targets and the voltage change time at the two ends of the detection resistor.

An object of the present invention is to provide a radiation curable pressure-sensitive adhesive sheet with excellent storage stability, which can suppress the progress of curing during storage and maintain excellent level difference absorbability and stress relaxation properties for a long time. A radiation curable pressure-sensitive adhesive sheet 1 of the present invention has a pressure-sensitive adhesive layer 10 that is cured by irradiation with radiation. The pressure-sensitive adhesive layer 10 contains a photopolymerization initiator 11a and a crosslinking agent 11b, and the curing by irradiation with radiation is curing by a reaction between the photopolymerization initiator 11a and the crosslinking agent 11b. In the radiation curable pressure-sensitive adhesive sheet 1 of the present invention, the pressure-sensitive adhesive layer 10 further contains a hindered amine light stabilizer 11c.

The invention provides a non-coupling parallel robot. The non-coupling parallel robot comprises a fixed platform, a movable platform, three driving branch chains and a just constraint branch chain. The three driving branch chains move on the fixed platform in the mode that every two driving branch chains are perpendicular to each other, one ends of the driving branch chains are connected with the fixed platform through moving pairs, and the other ends of the driving branch chains are connected with the movable platform through rotating pairs. The first driving branch chain and the third driving branch chain have the same structural form, and each of the first driving branch chain and the third driving branch chain consists of two moving pairs and three rotating pairs; the second driving branch chain is composed of two moving pairs and two rotating pairs. The right constraint branch chain is composed of a moving pair and a cylindrical pair, and the direction of the moving pair is perpendicular to the axis and the moving direction of the cylindrical pair. The four branches perform their own functions, complete decoupling of spatial three degrees of freedom is achieved, kinematics and dynamics modeling is easy, and the three-degree-of-freedom decoupling mechanism has the advantages of being simple in structure, easy to control and the like; meanwhile, the rigidity and the bearing capacity of the mechanism are improved and the stress condition of the mechanism is improved through the design of the just constraint branch chains.

This invention relates to a multi-purpose, rapid loading and unloading magazine, comprising a magazine body, a bullet chamber extending along a curved direction within the magazine body, a peripheral slide that can change the loading type, a magazine connector located at one end of the magazine body and engaging with the bullet chamber, and an ejector; the magazine connector is divided into rifle magazine connectors and pistol magazine connectors; the bullet chamber is equipped with a booster that slides with the bottom of the inner cavity to press linearly arranged bullets into the magazine, the booster being located at the outermost edge of one end of the bullet chamber and connected to a folding cover via a spring, similarly divided into rifle boosters and pistol boosters; the top of the bullet chamber is open, and the magazine body is equipped with a flip-up shockproof glass. The advantages of this invention are: through the cooperation of the magazine connector, bullet chamber, booster, or ejector, this invention can achieve rapid loading and unloading, has a reasonable structure, is easy to install, simplifies parts, and even if a part fails, it can be replaced with something else, resulting in low cost.

The present invention belongs to the auxiliary device of the bridge expansion device, and in particular refers to the application of a multi-directional displacement device for preventing tooth warping in a comb-tooth plate type expansion device. The multi-directional displacement device for preventing tooth warping includes a first fixed tooth plate fixed to the upper surface of the concrete structure on one side of the expansion joint by a first anchoring device, and a movable tooth plate mounted on the upper surface of the concrete structure on both sides of the expansion joint and having the inner side adapted to the tooth shape of the first fixed tooth plate; the side wall and the bottom of the self-resetting mechanism are buried in the concrete structure on the inner lower surface of the movable tooth plate, and also include a tooth plate pad, the upper surface of the tooth plate pad is attached to the movable tooth plate and the bottom surface of the first fixed tooth plate, and the top of the self-resetting mechanism passes through the tooth plate pad to cooperate with the lower part of the movable tooth plate and guides the sliding cooperation along the displacement direction of the movable tooth plate. The present invention solves the problems existing in the prior art that the tooth plate of the expansion device is easy to warp up and causes the tooth plate to be damaged. It has the advantages of effectively preventing the movable tooth plate from warping up, improving the stress condition of the movable tooth plate, and reducing the vibration and noise caused by displacement.