35results about How to "Prevent lateral swing" patented technology

The invention discloses a novel connection mode between a prefabricated concrete wall and a main structure and belongs to the technical field of prefabricated concrete component in housing industrialization. The novel connection mode comprises: connecting the upper part of the prefabricated concrete wall with a concrete beam, a beam hook and a wall hook in a flexible connection; filling in gaps on the side edges of the prefabricated concrete wall with rubber bricks to reduce the acting force exerted by a pillar on the prefabricated concrete wall at an earthquake; limiting the bottom part of the prefabricated concrete wall by a bottom-part blocking plate to prevent the prefabricated concrete wall from wobbling transversely. Suspension connecting mode is primary in the novel connection mode, gaps between the side edges of the prefabricated concrete wall and pillars are filled with the rubber bricks as a base-isolated device and the limit connection is arranged on the bottom part of the prefabricated concreted wall. According to this arrangement, the energy-dissipating capacity of the structure is improved, transverse wobbling of the prefabricated concrete wall is prevented, and the rigidity is reduced compared with that of a wet connection so that the prefabricated concrete wall of a building designed by standards of frame structure is effectively protected at an earthquake.

The invention relates to an aircraft manufacturing technology, belongs to mechanical products and particularly provides an aircraft engine installing device. The aircraft engine installing device comprises a base, a moving bracket, an L-shaped bracket, a guide rail placing assembly, a lifting mechanism, a locking mechanism and adjustable screw rods, wherein the guide rail placing assembly is installed between the L-shaped bracket and the moving bracket. Moving trundles are installed at four ends of the base. The adjustable screw rods are arranged on four sides of the moving bracket. The locking mechanism is used for limiting and fixing the L-shaped bracket and the lifting mechanism. A lifter is installed on the moving bracket. A jack is installed on the base. The aircraft engine installing device jacks up an engine and performs ascending motion by utilizing the ascending hydraulic jack, the jack can be locked by using a check nut and prevented from sliding downward in the event of oil leakage when ascending any height, the problem that a steel wire rope in the prior art is easily broken and corroded during traction motion is solved, and the using safety is improved.

The invention discloses a three-line pendulum and belongs to the technical field of mechanical experiment instruments. The three-line pendulum comprises a support, an upper plate, a lower plate, two suspended lines and an anti-leakage magnetic shell and an anti-leakage magnetic cover plate which can relatively rotate, the anti-leakage magnetic shell and the anti-leakage magnetic cover plate are made of permeability magnetic materials, the anti-leakage magnetic cover plate is fixedly mounted on the bottom of the lower plate, and a first connection column is fixedly mounted on the lower surface of the anti-leakage magnetic cover plate; a circle disk is fixedly mounted at the bottom of the first connection column, and multiple internal magnets which are distributed in the peripheral direction are arranged on the outer surface of the circle disk; a cylinder is fixedly mounted on the portion, outside the circle disk, in the anti-leakage magnetic shell, multiple external magnets which are distributed in the peripheral direction are arranged on the inner surface of the cylinder, the external magnets and the internal magnets are correspondingly arranged, and the polarities of the opposite surfaces of the external magnets and the internal magnets are same. The three-line pendulum is simple in structure, can measure the rotational inertia of an object which does not rotate around the mass center, can also measure the rotational inertia of an object which rotates around the mass center, and is high in measurement efficiency and in measurement accuracy.

The invention discloses a three-line pendulum capable of measuring the rotational inertia of an object not rotating around the center of mass, and belongs to the technical field of the mechanical experiment instrument. The three-line pendulum comprises a support, an upper disc, a lower disc and three suspension lines. The bottom part of the support is fixedly provided with an internal cylinder. The lower end of the internal cylinder is open, and the upper end is provided with a cylinder cover. The side wall of the internal cylinder is provided with multiple ventilation holes. A gas compressor is connected on the opening of the lower end of the internal cylinder. An external cylinder sleeves outside the internal cylinder. The two ends of the external cylinder are open. The gas compressor pressurizes the gas in the internal cylinder. The gas in the internal cylinder can enter the gap between the internal cylinder and the external cylinder through the ventilation holes and then can be discharged out of the upper open end and the lower open end of the external cylinder. The three-line pendulum is simple in structure and can measure the rotational inertia of the object not rotating around the center of mass and can also measure the rotational inertia of the object rotating around the center of mass, and the three-line pendulum is high in measurement efficiency and great in measurement accuracy.

The invention discloses a bridge anti-collision early warning system and method. The system comprises a control center and a plurality of early warning apparatuses, each early warning apparatus comprises a radar detector, an audible-visual alarm, a navigation mark, a navigation mark lamp, a closed buoy, buoy elevation guiding limiting assemblies, anchor bars, and guide rails, the radar detector comprises a radar, a control module and a wireless communication module, the radar and the audible-visual alarm are electrically connected with the control module, the control module is electrically connected with the wireless communication module, the wireless communication module communicates with the control center in a wireless manner, the radar detector, the audible-visual alarm, and the navigation mark are arranged on the buoy, the buoy can move up and down relative to the guide rails under the buoyancy effect of water through the buoy elevation guiding limiting assemblies, and whether an alarm is given and / or whether intrusion ships are notified are / is determined according to the time and area of the ships intruding into a radar monitoring defense area. According to the system and method, the ships can be accurately guided, the alarm is given when the navigation of the ship deviates, and the ships can be prevented from colliding with the bridge.

The invention belongs to the technical field of coal mine underground transport vehicles, in particular to a rear frame of a support transport vehicle capable of quickly changing the loading width and a use method thereof. It includes a front frame and a rear frame. The rear frame includes a middle box, a rotating frame, a left load frame and a right load frame. The middle box is hingedly connected with the front frame. The bearing frame is connected. The joint surface between the middle box and the left or right bearing frame is fixed by positioning pins and short bolts. A set of concave pads can be added in the middle of the joint surface. The pads are fixed by long bolts, and a rotating frame is connected between the middle box and the left and right bearing frames. One side of the rotating frame is connected with the middle box, and the other side of the rotating frame is connected with the left or right carrier. ; The inside of the tail of the left bearing frame and the right bearing frame are respectively provided with a clamping oil cylinder, and double ball head pull rods are connected between the clamping oil cylinders on both sides.

The invention relates to the technical field of printing equipment and discloses a printing device. The printing device comprises a printing roller and a grooved wheel mechanism. The grooved wheel mechanism comprises a grooved wheel and a rotating wheel. The end face of the grooved wheel is connected with an ink guide roller, and the ink guide roller is fixed to the printing roller. The ink guideroller is provided with a plurality of ink guide grooves distributed uniformly, an ink cavity communicating with the ink guide grooves is formed in the printing roller, and the outer surface of the printing roller is provided with ink outlet holes communicating with the ink cavity. The grooved wheel is provided with a plurality of clamping grooves, the number of the clamping grooves is equal to the number of the ink guide grooves, an opening of the side portion of each clamping groove is in sliding connection with a sliding plate for sealing the opening, the sliding plates can slide in the radial direction of the grooved wheel, a cavity is formed between each sliding plate and the groove wall of the corresponding clamping groove in an enclosed mode, a piston is connected in each cavity ina sliding mode, a nozzle is connected to the end, close to the circle center of the grooved wheel, of each cavity, a pressure valve is arranged on each nozzle, and each nozzle faces the interior of the corresponding ink guide groove. The rotating wheel is provided with a clamping post. By means of the printing device, the problem that ink liquid in ink grooves is thrown out during ink feeding of existing printing rollers can be solved.

The invention discloses a movement tray. The movement tray comprises a lifting disc sliding groove (1). A lifting disc (4) is arranged in the lifting disc sliding groove (1). The root of the lifting disc (4) is provided with eight sets of lifting rolling wheels (2), each lifting rolling wheel (2) is a bearing set composed of two cylindrical roller bearings. The four sets of lifting rolling wheels (2) are arranged in a vertical groove of the lifting sliding groove, a lifting cylinder (3) is arranged below the four sets of lifting rolling wheels (2), and the lifting disc (4) achieves upward movement in the lifting disc sliding groove (1) by jacking the four sets of lifting rolling wheels (2) through the lifting cylinder (3). The movement tray is used for achieving the concept that airplane ground support equipment is assembled and disassembled precisely and quickly, and simplification and miniaturization of the movement tray are guaranteed through the structure.

[Problem to be solved] The present invention provides a compound needle for a flatbed knitting machine in which sliding resistance can be made small and opening / closing accuracy to an aperture of a hook by a tongue can be enhanced with a simple structure. [Solution] Tongues 1a, 2a have no bent and have linear shaped portions 1b, 2b provided at the rear side of the tongues 1a, 2a, so that the blades 1, 2 have stable finishing shapes and manufacturing thereof can be easily performed. Since lower portions of the blades 1, 2 are not bent in the blade groove, sliding resistance can be made small. Shoulder portions 1c, 2c which come out of the blade groove from rear portions of the tongues 1a, 2a are bent inward between the shoulder portions 1c, 2c opposed to each other such that front ends of the shoulder portions 1c, 2c make closer to and contact with each other so as to form contacting portions 1f, 2f, therefore, a centering effect can be obtained. A space generated between the tongues 1a, 2a is kept so that resistance when the hook 3a opens between the tongues 1a, 2a can be made small and opening / closing accuracy of the hook 3a can be enhanced.

The invention relates to a dynamic sealing device for blocking a rotary blowout preventer between a drill column and a borehole in drilling of oil-gas fields. The dynamic sealing device overcomes the defects that the conventional dynamic sealing device has short service life, is quick in heat emission and is easily sintered. The invention adopts the technical scheme that: a supporting ring is arranged in a packing box, the supporting ring is provided with an oil hole b and an oil hole c, and the outer surface of the supporting ring is provided with an annular groove b; a disc spring is arranged in the supporting ring, a caulking ring is arranged at the lower part of the disc spring, and the supporting ring is arranged between the caulking ring and a pressure ring; the pressure ring is provided with an oil hole a, and a V-shaped sealing ring and a spacing ring are sequentially arranged at the lower part of the pressure ring at intervals; a packing pressure ring is arranged at the lower end of a floating ring, the packing pressure ring is fixed at the end of the packing box, and the packing pressure ring is in clearance fit with a central pipe bush; and the central pipe bush is in interference fit with a central pipe, the packing box is in interference fit with an upper shell of the blowout preventer, and lubricating oil enters an oil hole in the upper shell of the blowout preventer through a bearing. The dynamic sealing device is suitable for relatively high dynamic sealing pressure, reduces sintering of the sealing ring, has low heat emitting abrasion and long service life, and reduces the abrasion rate.

The invention discloses a horizontal bar and parallel bars for remote control teaching. A first supporting plate is welded to the top of a first support, a second supporting plate is welded to the top of a second support, the first supporting plate is connected with a first hollow column which is connected with a first locking rocker, the second supporting plate is connected with a second hollow column which is connected with a second locking rocker, a first conical balancing weight is connected with the first locking rocker through a first lifting screw, a second conical balancing weight is connected with the second locking rocker through a second lifting screw, the first locking rocker is connected with a first lifting motor and a first remote control receiver, the second locking rocker is connected with a second lifting motor and a second remote control receiver, and the second remote control receiver is electrically connected with the second lifting motor. The locking rockers are remotely controlled to adjust the balancing weights, so that the gravity center of the whole horizontal bar and parallel bars moves upward or downward to be suitable for different users, the users can take exercises stably in a balanced mode, and the teaching and exercising effect are better.

The invention relates to a horizontal type vibration centrifugal machine, comprising a spindle, a sleeve, a vibration box, a vibration motor, belt wheels and a screen basket, wherein the sleeve is sleeved outside the spindle; the vibration box is sleeved outside the sleeve and is fixedly connected with the sleeve; the vibration motor is arranged outside the vibration box; the belt wheels are respectively arranged at the two ends of the spindle; fixed labyrinths are respectively arranged at the two ends of the vibration box; the end, close to the screen basket, of the spindle is sleeved with a rotatable labyrinth adaptive to the fixed labyrinths; the horizontal type vibration centrifugal machine also comprises an automatic control system used for controlling the vibration motor, wherein the automatic control system comprises a vibration centrifugal machine working parameter obtaining device, a controller and a frequency converter; the vibration centrifugal machine working parameter obtaining device is connected with the frequency converter by the controller; the frequency converter is connected with the vibration motor; the vibration centrifugal machine working parameter obtaining device obtains the processing amount of the vibration centrifugal machine, the water content of materials, the working amplitude of the vibration centrifugal machine and the working frequency of the vibration centrifugal machine.

The invention discloses a forming and sealing device used for a hollow packaging machine of food. The forming and sealing device comprises a rack, a cutter sealing angle component and a bag forming component, wherein the cutter sealing angle component comprises a bracket, a first expansion link, a second expansion link, an upper fixing plate, a lower fixing plate, an upper heat sealing seat, a lower heat sealing seat, a first angle plate and a second angle plate, wherein the upper fixing plate and the lower fixing plate penetrate through the first expansion link and the second expansion link; the upper heat sealing seat is fixedly arranged on the upper fixing plate; the lower heat sealing seat is fixedly arranged on the lower fixing plate; the first angle plate and the second angle plate are positioned between the upper heat sealing seat and the lower heat sealing seat; the upper heat sealing seat and the lower heat sealing seat are driven by an air cylinder assembly installed on the bottom of the bracket; the first angle plate is driven by a first angle air cylinder sheathing the first expansion link; the second angle plate is driven by a second angle air cylinder sheathing the second expansion link; the first angle plate and the second angle plate are symmetrically arranged. According to the forming and sealing device used for the hollow packaging machine, the cutter sealing angle component can be used for carrying out continuous end surface angle and sealing on a vertical sealing square bag, so that the forming and sealing efficiency of whole package is improved so as to improve the packaging efficiency of a finished product.