46results about How to "Easy to manufacture and process" patented technology

The invention provides a multidirectional corrugated inner finned tube which comprises an outer tube, a plurality of multidirectional corrugated inner fins are uniformly distributed on the inner circumferential face of the outer tube. Each multidirectional corrugated inner fin comprises a root, two straight walls and two bends. Multidirectional corrugated patterns are distributed on the two straight walls, and lines of the multidirectional corrugated patterns on the same straight wall are consistent in tendency. The bends and the inner surface of the outer tube are in a brazing manner. The straight walls extend radially along the outer tube. The outer tube and the multidirectional corrugated inner fins form a plurality of parallel circulating channels. The multidirectional corrugated inner finned tube provided by the invention has various structural patterns and is easy to form and process. Compared with an optical tube, the effective heat transfer area is remarkably increased, so that the flow medium flow pattern in the tube is forcibly guided. The secondary flow is enhanced, the transverse turbulent flow is aggravated, the turbulivity is increased and the boundary layer of a flow medium is strongly interfered, so that the purpose of efficiently enhancing the heat transfer is realized. Meanwhile, the vertical flowing resistance in the tube can be controlled. Compared with the common finned tube, the resistance is remarkably reduced with the same thermal load.

The invention relates to a mould for manufacturing hollow pipes and hollow-structure sheets, in particular to a rubber water injection core mould. The top end of a rubber water injection mould body is provided with an air inlet and exhaust nozzle; an upper cover is arranged on the air inlet and exhaust nozzle; the top end of the rubber water injection mould body is provided with a water inlet and outlet port which is provided with screw threads; a water port cover with internal threads is matched with the water inlet and outlet port; and both sides of the top end of the rubber water injection mould body are provided with hanging lugs. When the rubber water injection core mould is used, wateris injected into the rubber water injection mould from the water inlet and outlet port, and after a workpiece is molded, water is discharged from the water inlet and outlet port, so that the core mould can be conveniently drawn out of the hardened workpiece. The core mould is made of rubber and can be used repeatedly, thus the production cost is reduced.

The invention discloses a diagonal bracing for supporting a side wall of a crossbeam of a building. The diagonal bracing comprises a support plate. The support plate is used for being abutted to the side plate of the crossbeam of the building, and an extendable rod is hinged on the side, which is far away from the side plate of the crossbeam of the building, of the support plate. The diagonal bracing has the advantages that owing to a structure comprising the support plate and the extendable rod which are hinged with each other, a free end of the extendable rod is abutted onto another support, then the extendable rod can be adjusted and extends, so that the support plate can be abutted to the side plate of the crossbeam of the building and tightly pushes the side plate, the side plate of the crossbeam of the building can be effectively guaranteed against loosening and shifting, and building construction can be carried out smoothly; when the side plate of the crossbeam of the building needs to be detached, only the extendable rod needs to be adjusted and shortened, then the support plate can be automatically released from the side plate of the crossbeam of the building conveniently and quickly, and accordingly labor and the labor time are saved; both the support plate and the extendable rod are made of metal instead of the traditional wood particles, so that wood is saved, and forest resources are protected.

The invention discloses a disk type torque limiting permanent magnet coupler. The disk type torque limiting permanent magnet coupler comprises a first shaft and a second shaft which are arranged in a split type and coaxial with each other, wherein a first shaft sleeve, a sliding sleeve I and a conductor rotary disk are arranged on the first shaft, the conductor rotary disk is composed of a steel disk and a conductor disk made of good conductive material, a portion of the first shaft sleeve is a square shaft, and matched with the first shaft sleeve through a square hole formed in the sliding sleeve I, the sliding sleeve I can move in the axial direction, limiting structures are arranged on two end faces of the conductor rotary disk, a second shaft sleeve and a load connection disk are arranged on the second shaft, the load connection disk is connected with a permanent magnet rotary disk through a connection rod, a permanent magnet is installed on the permanent magnet rotary disk, and positions of the permanent magnet and the conductor disk are corresponding to each other. According to the disk type torque limiting permanent magnet coupler, structure of the second shaft is simplified, only the one permanent magnet rotary disk is arranged on the disk type torque limiting permanent magnet coupler, the weight of the second shaft is greatly reduced, the second shaft is stable during the rotation process, and therefore mechanical friction and wear are reduced, vibratory interference is avoided, loss of a drive component is reduced, vibration is isolated, noise is reduced, installation and debugging are simple, and the size of an air gap is accurate to control.

The invention discloses a moving die plate of an injection molding machine and the injection molding machine. The moving die plate of the injection molding machine comprises a die block base body, a guide cylinder provided with a guide column hole, an ejecting mechanism mounting plate and mechanically reamed connecting bases, wherein the guide cylinder and the mechanically reamed connecting bases are separately arranged on the die block base body, the mechanically reamed connecting bases are arranged in pairs, and a first reinforcing rib plate is connected between each pair of mechanically reamed connecting bases; the ejecting mechanism mounting plate is arranged on the first reinforcing rib plates; and the mechanically reamed connecting bases are directly connected to the die block base body, and no gaps are arranged between the mechanically reamed connecting bases and the die block base body, so that the mechanically reamed connecting bases cannot easily deform or crack when subjected to tensile force or pressure. Therefore, the strength and the rigidity of the mechanically reamed connecting bases can be increased; and at the same time, by adopting reasonable mechanism design, used materials are reduced, and the weight of the moving die plate is reduced, so that the moving die plate is more flexible in running and more convenient to machine.

The invention provides a multifunctional firefighting lifesaving device and belongs to the field of rescue equipment. The multifunctional firefighting lifesaving device comprises a base, a truss ladder, a cable-stayed fixing frame, an auxiliary supporting frame and a ground drill. The truss ladder comprises a truss body. The base is hinged to one end of the truss body. The truss body comprises multiple walking ladder units which are connected in sequence and multiple limiting parts, adjacent walking ladder units are hinged, and adjacent walking ladder units are connected through the limiting parts. The limiting parts are used for limiting relative rotation of the adjacent walking ladder units, and the limiting parts are detachably connected with the walking ladder units. The cable-stayed fixing frame, the ground drill and the auxiliary supporting frame are installed on the base. When the multifunctional firefighting lifesaving device is used, the use state of the multifunctional firefighting lifesaving device can be adjusted according to different rescue environments, the multifunctional firefighting lifesaving device can be used for conducting rescue when fires, floods, debris flow and the like happen, the use range is wide, the rescue efficiency is improved, and losses caused by disasters can be reduced to the maximum degree.

The invention provides an automobile lifting machine table top and an auxiliary device for automobile maintaining and repairing and belongs to the field of automobile lifting machines. The automobile lifting machine table top comprises a main lifting table top body, a first blocking assembly, a second blocking assembly and a reminding assembly. The main lifting table top body is provided with a limiting groove. The main lifting table top body is provided with the first blocking assembly and the second blocking assembly. The reminding assembly comprises a floating ball, a connecting wire, a control wire and a shearing part, wherein the connecting wire connects the main lifting table top body and the floating ball, the shearing part is rotationally connected with the main lifting table top body, the control wire connects the main lifting table top body and the floating ball, and the control wire is located between a knife edge of the shearing part and the main lifting table top body. A driver can clearly feel whether an automobile is driven to an appropriate overhaul position or not, meanwhile, the automobile cannot be driven out or slide out from the other end, the table top is stable and reliable, the potential safety hazards are extremely small, and the personal safety of a serviceman and the safety of the vehicle to be maintained and repaired can be guaranteed better.

The invention relates to a heaving truck lifting machine moving method and a special mechanical moving device thereof. One special mechanical moving device is equipped and the bottom thereof is provided with a pair of rear wheels (15); two bottom legs (21) at the front side of an upright column (20) of the heavy truck lifting machine are respectively provided with two front wheels (22) internally; and the front wheels (22) and the pair of rear wheels (15) are taken as walking wheels to move the heavy truck lifting machine. The invention not only leads the manufacturing and processing to be simple for implementation, but also leads the cost to be greatly reduced. Each set of heavy truck lifting machine (calculated by 4 columns) shares a mechanical trolley. Compared with the original hydraulic transfer car, each set of mechanical trolley can save cost.

The invention discloses a light-weight automobile rear torsion bar suspension bracket, which comprises a longitudinal plate I and a longitudinal plate II arranged symmetrically with the longitudinal plate I, and the upper end edge of the longitudinal plate I passes through the upper end edge of the longitudinal plate II. A horizontal plate is connected, and the vertical plate I, the vertical plate II and the horizontal plate are all sheet metal structures and integrally formed; the horizontal plate is provided with an engine connection part for connecting with the engine; The edge of the left end of the plate I extends to the left to form lugs I and II, and the lugs I and II are provided with a cushion connection part for connecting with the rear torsion bar suspension cushion assembly; the structure of the present invention is simple , The manufacturing cost is low, and the weight is relatively light, which meets the lightweight requirements of the engine structure and reduces the fuel consumption rate of the whole vehicle.

The invention relates to a method for preparing multiple sets of impellers of a wind power generator, comprising the steps of: preparing at least two helical blades equipped with hubs, preparing at least two keel frames, and preparing at least two or more fasteners; One end of the blade is installed in the blade positioning groove of the hub and locked with a fastener, and the other end is connected with the keel frame and locked with a fastener to complete the assembly of one set of impellers, and assemble another set of impellers in the same way, and then , adjust the gap between each blade so that it is between 0.01 and 1.77 cm and make it evenly spaced; assemble each group of impellers on the same shaft according to concentricity and coaxiality, and the blades in each group are relatively the same The shafts are stacked and rotated 180° from top to bottom to surround the shafts, and the distance between each impeller group is between 0.02 and 2 cm.

The invention relates to a method for manufacturing a spiral swivel vertical shaft wind power generator device. The method comprises the following steps of: preparing a motor, a long shaft having the length more than or equal to 100 centimeters and the diameter more than or equal to 10 centimeters, at least two or more keel brackets, at least two or more vanes and at least more than two fasteners respectively; connecting the motor and a shaft sleeve of the long shaft so that the long shaft is relatively vertical to a motor base; horizontally installing the keel brackets relative to the vertical direction of the long shaft and fixedly connecting the keel brackets and the long shaft by using the fasteners; installing the vanes onto the keel brackets one by one so that the vanes surround at 180 degrees along the vertical direction of the long shaft and regulating vane installation distances on the keel brackets; and finally locking the keel brackets and the vanes by using the fasteners.

The invention provides a subway construction temporary rail car derailing pre-warning mechanism and a subway construction temporary rail car transporting system. The subway construction temporary railcar derailing pre-warning mechanism and the subway construction temporary rail car transporting system are used for working together with a transporting rail body. The subway construction temporary rail car derailing pre-warning mechanism comprises a rail deviation detection unit; the rail deviation detection unit comprises a sensor component; the sensor component comprises a controller, a receiving end and a transmitting end; the receiving end and the transmitting end are correspondingly mounted on the two spliced transporting rail bodies; and the receiving end and the transmitting end are both electrically connected with the controller.

The invention provides a continuous filling and rapid canning system for powder materials. The continuous filling and rapid canning system for the powder materials comprises a charge unit, a rotary filling unit, a can body input unit and a can body output unit, wherein the charge unit comprises an annular charge groove and a charge pipe, at least two charge ports are formed in the annular charge groove, and one end of the charge pipe stretches into the annular charge groove; the rotary filling unit comprises a drive element, a rotary base, a rotary disc and a filling assembly, the rotary baseand the rotary disc are installed on the drive element, at least two filling stations are formed on the rotary base, the charge pipe is installed on the outer ring of the rotary disc, and the paired filling stations are connected with the charge port through the filling assembly; and the can body input unit is used for conveying can bodies onto the filling stations, and the can body output unit isused for removing the filled can bodies away from the filling stations. Material adding is completed in a movement process, and the can bodies do not need to be stopped at set positions, so that thefilling efficiency is greatly increased.

The invention discloses an automatic discharging device of storage trays on a security check line. The device comprises a rack, a driving device, a tray taking and sending mechanism and a tray pushingmechanism, wherein the rack is made of pipe section welding pieces, and the driving device is fixed on the rack through a motor seat and a bearing seat and driven by a motor; the disc taking and feeding mechanism adopts a cam-linkage combined mechanism, and is fixed on the rack through a support seat, a guide seat, an L-shaped guide seat and a double-axis linear slide rail, so that supporting andlifting functions of the storage trays can be achieved; the tray pushing mechanism adopts a combination of a cam mechanism and a diamond mechanism, and is fixed on the rack through a fixing support and an I-shaped plate, and the pushing function of the storage trays can be achieved. The device has the function of automatically pushing the topmost storage tray stacked in a storage cabinet to a security check transport belt, and also has the advantages of being simple in structure, convenient to mount, low in cost and the like.

Disclosed are a positioning and clamping mechanism and a laser processing system which are used for positioning and clamping during machining of crisp and hard materials. The positioning and clampingmechanism comprises a base and a clamping assembly. The clamping assembly comprises a telescopic cylinder, a connecting rod, a driving wheel, a driven wheel, an annular conveying belt and clamping heads arranged in pairs, wherein the telescopic cylinder is installed on the base; the driving wheel and the driven wheel are rotationally arranged on the base; the annular conveying belt is tensioned onthe driving wheel and the driven wheel; the power output end of the telescopic cylinder is hinged to the connecting rod; the connecting rod is connected with the driving wheel in a circumferential limiting mode; the clamping heads arranged in pairs are installed on the annular conveying belt, and clamping space is formed between the clamping heads arranged in pairs; and the driving wheel can rotate relative to the base to enable the annular conveying belt to rotate, and therefore the clamping heads arranged in pairs can get close to clamp workpieces located in the clamping force. The clampingheads make gentle contact with the glass workpieces by controlling the annular conveying belt, the contact stress is greatly reduced, glass is not damaged, and the yield is improved.

The invention discloses an automatic disk stacking device for a security line collection disk. The automatic disk stacking device comprises a rack, a motor base, a speed reducer, a servo motor, a disklifting mechanism and a disk stacking mechanism, wherein the rack is a pipe section bar weldment; the motor base is fixed on the rack; the speed reducer is fixed on the motor base; the servo motor isfixedly connected with the speed reducer; the disk lifting mechanism is a slider-crank mechanism, a linear guide rail is fixed on the rack, and one end of a lifting crank is fixedly connected with anoutput flange of the speed reducer; the disk stacking mechanism is a cam-connecting rod combined mechanism; a support, a bearing seat and a guide rail fixing plate are fixed on the rack; one end of along connecting rod is articulated with the lifting crank. The automatic disk stacking device disclosed by the invention realizes a function of stacking collection disks delivered to a position belowa disk storage cabinet by a conveying belt at the lower part of the security line, and also has the advantages of simple structure, convenience in mounting, low cost and the like.

The invention discloses a metamaterial satellite antenna which comprises a metamaterial flat plate arranged on the rear side of a feed source. The metamaterial flat plate comprises a core layer and a reflecting plate arranged on the rear surface of the core layer. The core layer comprises a substrate and a plurality of artificial microstructures attached to the front surface of the substrate. The reflecting plate is attached to the rear surface of the substrate so that after electromagnetic wave transmitted from the feed source passes through the metamaterial flat plate, an included angle formed by emergent plane electromagnetic wave and the normal direction of the core layer is not zero, namely the directions of the emergent electromagnetic wave and the normal of the core layer are different, so that minor lobe level of the satellite antenna can be effectively reduced compared with the electromagnetic emitting in the normal direction of the core layer. The sheet-shaped metamaterial flat plate replaces a traditional parabolic antenna, therefore manufacture and machining are easy, cost is low, in addition, the overall thickness of the metamaterial flat plate is in a millimeter level, and the metamaterial flat plate is thin and light. The invention further provides a satellite receiving system.

The invention discloses a gas supply system of reaction equipment and the reaction equipment. The gas supply system comprises air inlet units, each air inlet unit comprises an air inlet pipe and a gasoverflow pipe, one end of the gas inlet pipe is connected with the side wall of the gas overflow pipe and communicates with the gas overflow pipe, two ends of the gas overflow pipe are closed, a plurality of gas outlet holes are formed in the gasoverflow pipe, the plurality of gas outlet holes are arranged at intervals along the axis direction of the gas overflow pipe, and the distance between every two adjacent gas outlet holes is gradually increased from the middle of the length direction of the gas overflow pipe to the two ends of the gas overflow pipe. The reaction equipment comprises thegas supply system. The gas supply system is simple and reasonable in structure, is convenient to manufacture and process, and has low manufacturing and installation cost, and meanwhile, the gas supply system can provide sufficient gas into a reaction barrel, the temperature in the reaction barrel can meet the requirements, and a good environment is provided for reaction of materials in the reaction barrel, so that the reaction quality and reaction speed of the materials are improved, and the efficiency is improved.

The invention relates to an oil charging tool for an oil seal electric connector. The oil charging tool for THE oil seal electric connector comprises an oil charging cylinder, a guide rod and a pressurizing piston, an electric connector connecting structure used for being connected with a shell of the oil seal electric connector is arranged at one end of the oil charging barrel, a plug connectingstructure used for being connected with a plug of the oil seal electric connector is arranged on the guide rod, the oil charging cylinder serves as a cylinder body of the pressurizing piston, and a penetrating hole matched with the guide rod in a sealed mode is formed in the middle of the pressurizing piston. The oil charging tool for the oil seal electric connector is only composed of the simpleoil charging cylinder, the guide rod and the pressurizing piston, manufacturing and machining are convenient, the size and weight are small, carrying is convenient, and the problems that in the priorart, oil charging equipment for an electric connector is large in size and mass and inconvenient to carry are solved.

The invention provides transportation equipment of a hinging device, and belongs to the field of bridge engineering. The transportation equipment of the hinging device includes a bottom plate, an auxiliary plate, a supporting piece and a limiting assembly, wherein one side of the auxiliary plate is hinged to the bottom plate, and the supporting piece takes an effect of supporting between the auxiliary plate and the bottom plate; the limiting assembly is installed on the auxiliary plate, and the limiting assembly and the supporting piece are positioned on the both sides of the auxiliary plate; the limiting assembly comprises a plurality of inserting and connecting rods inserted into a plurality of inserting and connecting holes in an one-to-one correspondence mode. After the hinging device is manufactured in a workshop or a set location, the transportation equipment of the hinging device is utilized for transportation, and therefore the construction progress is accelerated, the construction time is saved, and the cost is reduced.

The invention provides a lead screw transmission mechanism and a booster for local anesthesia in the oral cavity, which belong to the field of medical devices and are used to be installed on the booster for local anesthesia in the oral cavity, including a screw main body, a drive nut, a motor, a guide, a first The Hall sensor assembly and the controller, wherein the output shaft of the motor is driven and connected to the main body of the screw, the drive nut is screwed on the main body of the lead screw, the drive nut is slidably connected to the guide, and the rotation of the drive screw drives the drive nut to reciprocate relative to the guide Movement; the signal of the first Hall sensor is connected to the controller for detecting the rotational speed of the motor, and the controller controls the connected motor. The screw drive mechanism is applied to a booster for local anesthesia in the oral cavity, which can accurately control the injection amount of medicine and improve the safety of medicine injection, and is convenient and quick to operate, sensitive to control, can be made into a pen type, and is easy to operate.

The invention provides a segmented valve. The segmented valve comprises a valve head, a valve body and a valve tail; the valve head, the valve body and the valve tail are connected in sequence; and flange structures matched with pipes are arranged at free ends of the valve head and the valve tail. The segmented valve further comprises a pressure adjusting valve electric actuator, a push rod, a valve rod, a valve element, inner and outer porous sleeves, a reverse flowing hole and a sealing ring; a fluid enters the interior of a valve body runner from an inlet, passes through a double-sleeve porous structure, and flows out from an outlet; the pressure adjusting valve electric actuator drives the push rod; the push rod drives the valve rod; the valve rod is connected with the valve element; and no gap is formed between the valve element and an inner sleeve. The segmented valve can effectively balance the valve rod, the push rod and external pressure to prevent the defects of force waste and even deformation of structural parts in the adjusting process, and meanwhile, is easy to manufacture a three-section structure, simple in assembly and low in cost.

The invention discloses a fallback type satellite television antenna which comprises a diffusing element and a metamaterial panel. The metamaterial panel comprises a core layer which comprises a core layer sheet layer, the core layer sheet layer comprises a circular region and a plurality of ring regions surrounding the circular region, refractive indexes at the position with same radii of the circular region and the ring regions are same, the refractive indexes gradually decrease along increase of the radii in respective region of the circular region and the ring regions, a minimum value of the refractive index of the circular region is smaller than a maximum value of the refractive index of the adjacent ring region, and a minimum value of the refractive index of the ring region on the inside of two adjacent ring regions is smaller than a maximum value of the refractive index of the ring region on the outside of the two adjacent ring regions. By means of the fallback type satellite television antenna, the sheet fallback type satellite television antenna replaces a traditional parabolic antenna and is easy to manufacture and low in cost. In addition, the invention further discloses a satellite television receiving system with the fallback type satellite television antenna.

The invention discloses a meta-material satellite antenna, comprising a meta-material flat plate which is arranged behind a signal transceiver, wherein the meta-material flat plate comprises a core layer and a gridding reflection plate arranged on the rear surface of the core layer; the core layer comprises a substrate and a plurality of artificial micro-structures attached to the front surface of the substrate; the gridding reflection plate is attached to the rear surface of the substrate so that electromagnetic waves sent by a satellite are responded by the meta-material flat plate and are converged in the signal transceiver; and the sheet-shaped meta-material flat plate replaces a traditional parabolic antenna, so that the manufacturing and machining are easier and the cost is lower; furthermore, the whole thickness of the meta-material flat plate designed by the invention is at a millimeter grade and the meta-material flat plate is very light and thin; and the special artificial micro-structures are adopted so that the satellite antenna has a frequency selection function. The invention further provides a satellite receiving system.

The invention discloses a panel radio telescope. The panel radio telescope comprises metamaterial panel antenna which is arranged on the back portion of a receiver. The metamaterial panel antenna comprises a core layer and a baffle-board which is arranged on a lateral surface of the core layer and the core layer comprises at least one core layer slice layer. The core layer slice layer comprises base material which is in a slice shape and a plurality of artificial microstructures which are arranged on the base material. A fixed point is regarded as a center of a circle, the refractive indexes are the same at places which are located on the core layer slicer layer with the same radiuses and gradually decrease as the increasing of the radiuses. A ligature of the center of the circle and the receiver is vertical to the core layer slice layer, and the center of the circle does not coincide with a center of the core layer slice layer. Due to the fact that the slice-shaped metamaterial panel antenna replaces a traditional parabolic antenna, the panel radio telescope is easy to manufacture and process and low in cost.

A ventilated sound insulation screen and a window assembly are disclosed. The ventilated sound insulation screen is used for being mounted on a wall, a sash mounting port is arranged in the wall, anda sash is installed at the sash mounting port. The ventilated sound insulation screen comprises a sound insulation screen unit and a ventilation silencer unit. The sound insulation screen unit comprises a sound insulation substrate and a mounting member for mounting on the wall, the sound insulation substrate is movably mounted on the mounting member, the sound insulation substrate is spaced apartfrom the sash, the ventilation silencer unit comprises a ventilation member and a noise absorbing blade, the ventilation member is provided with an air inlet passage for connecting the indoor and outdoor, the noise absorbing blade is mounted on the ventilation member, and the noise absorbing blade is located in the air inlet passage; during movement of the sound insulation substrate relative to the mounting member, the sound insulation substrate can block an air channel passing through the sash port of the sash and communicating with the indoor, so that the outdoor air is allowed to enter theroom from the air inlet passage. At the same time, the ventilation function and the sound insulation function are achieved, the installation is convenient, and the cost is low.

The invention provides a display structure of an electronic scale and a projection electronic scale with a drawer type receiving panel. The display structure of the electronic scale is used in cooperation with a scale body of the electronic scale. The scale body comprises a scale shell. The scale shell is provided with a propagation opening for light propagation. The display structure of the electronic scale comprises a receiving panel and a display assembly used for projecting and displaying weighing readings. The receiving panel is movably installed on the scale shell and slides between a first working position and a second working position. The receiving panel is retracted into the scale shell when the receiving panel is at the first working position. The weighing readings projected bythe display assembly from the propagation opening can be displayed on the receiving panel when the receiving panel is at the second working position. According to the display structure of the electronic scale and the projection electronic scale with the drawer type receiving panel, a projection surface can be selected according to requirements to clearly obtain projection images; and the use is wide in range, safety, and reliability.

The invention discloses a feed-forward satellite television antenna which comprises a divergence element and a metamaterial panel. The metamaterial panel comprises a reflector and a core layer, and the core layer comprises core layer slices. Each core layer slice comprises a circular region and a plurality of annular regions distributed around the circular region, the refractive index of an optional position of the circular region is identical to the refractive index of an optional position, with the radius identical to that of the optional position of the circular region, of each annular region, the refractive index of each of the circular region and the annular regions is gradually decreased along with increase of the radius of each of the circular region and the annular regions, the minimum refractive index of the circular region is smaller than the maximum refractive index of each annular region adjacent to the circular region, and the minimum refractive index of the inner annular region of each two adjacent annular regions is smaller than the maximum refractive index of the outer annular region of the two adjacent annular regions. The platy metamaterial panel replaces the traditional parabolic antenna, and the feed-forward satellite television antenna is easy to manufacture and process and low in cost. In addition, the invention further provides a satellite television receiving system with the feed-forward satellite television antenna.

The invention discloses a forced synchronous resonance inertia cone crusher which comprises a machine shell, a motor, a vibration exciter, a main vertical shaft, an inner crushing cone and an outer crushing cone which are installed on a machine base, the motor drives the vibration exciter through a transmission assembly, and centrifugal resultant force generated by the vibration exciter drives the main vertical shaft and the inner crushing cone to move synchronously; the vibration exciter comprises a vibration excitation box and a centrifugal mechanism arranged in the vibration excitation box in a sealed mode, the centrifugal mechanism comprises a plurality of sets of centrifugal assemblies arranged outside the main vertical shaft in a balanced mode, all the centrifugal assemblies are driven by a transmission gear set to work, and centrifugal resultant force of all the centrifugal assemblies is transmitted through the vibration excitation box to drive the main vertical shaft to drive the inner crushing cone to rotate and swing; and a self-adjusting discharge mechanism is arranged between the outer crushing cone and the inner crushing cone. The whole forced synchronous resonance inertia cone crusher is simple in structure. The manufacturing process is simple, the manufacturing cost is low, and installation and maintenance are convenient; and compared with a traditional crusher, the vibration crushing efficiency is high, energy consumption is low, and adjustment of the gap of a crushing cavity under the normal working condition can be achieved.

The invention provides an adjustable screw bolt support seat for a wood structure platform, an adjustable structure for the wood structure platform and the wood structure platform. The adjustable screw bolt support seat for the wood structure platform is fixedly connected with a support seat installing position of the wood structure platform, and comprises an angle bottom steel plate, a steel sleeve pipe and a leveling screw bolt; the angle bottom steel plate is in horizontal arrangement; screw holes and a hole are formed in the angle bottom steel plate; the steel sleeve pipe is vertically arranged and is provided with internal screw threads; the lower end of the steel sleeve pipe is fixedly connected onto the angle bottom steel plate and is communicated with the hole; the leveling screw bolt is connected into the steel sleeve pipe through screw threads; the upper end of the leveling screw bolt is provided with a small hexagon head; and the lower end surface of the leveling screw bolt is a spherical surface. The adjustable screw bolt support seat and the adjustable structure have the advantages that the bearing force is strong; meanwhile, the height is adjustable; the structure is simple; the operation is convenient; the repeated use can be realized; and the use is very flexible. The adjustable screw bolt support seat and the adjustable structure are suitable for various kinds of temporarily built dismountable wood structure platforms needing to be repeatedly used.