96results about How to "Flexible and convenient adjustment" patented technology

The invention relates to a light projection angle adjusting structure of a lamp, comprising a rotating support assembly for connecting an electrical appliance box and a lamp body; the assembly comprises a rotating shaft connected with the lamp body and a rotating seat connected with the electrical appliance box; the rotating shaft and the rotating seat realize the angle adjustment of a lamp body through the longitudinal matching of an annular groove, an annular flange and mutually occlusive trapezoid sawteeth and are fixed through bolts after being adjusted; and the rotating seat and the electrical appliance box realize the angle adjustment and fixation of the lamp body in a horizontal circumferential plane through the horizontal matching of a flange plate, the annular groove and bolts. The structure is also provided with scales for facilitating adjusting process parameters. The structure provided by the invention realizes wide-range adjustment of an angle of the lamp and is flexible and convenient in adjustment mode; and the structure can be firmly fixed after being adjusted, is wide in application range and particularly suitable for angle adjustment of lamps with large sizes and weights.

The invention discloses an ultra-low frequency modal test suspension system, comprising a modal test suspension device and a monitoring computer for realizing remote detection and monitoring. The monitoring computer is connected with an Ethernet router; an air tank and a pneumatic actuator are connected with an air pressure control MPU (Microprocessor Unit); a suspension follower is connected with a linear displacement coder, a suspension force sensor and an electromagnetic force sensor; an electromagnetic actuator is connected with a power amplifier; the linear displacement coder is connected with a CPLD (Complex Programable Logic Device) processing module which is connected with an electromagnetic force control MPU; the suspension force sensor and the electromagnetic force sensor are connected with the electromagnetic force control MPU; the air pressure control MPU and the electromagnetic force control MPU are both connected with a modal suspension control MPU; and the modal suspension control MPU is connected with the Ethernet controller which is connected with the Ethernet. The invention realizes fully digital control, improves the work efficiency, improves the control precision and reduces the influence of the accessories on the modal test.

The present invention relates to a stainless steel seamless composite hollow pipe billet continuous casting machine. Said continuous casting machine consists of the following five portions: internal crystallizer, upper crystallizer, lower crystallizer, dummy ingot cutting car and turnover roller way. Said invention also provides the connection mode of all the above-mentioned five portion, and provides the working principle of said continuous casting machine and its concrete operation method.

The invention relates to a screening device, in particular to an efficient screening device for corn seeds. The technical purpose refers to that the efficient screening device for corn seeds is high in separating speed and efficiency and convenient and flexible to adjust. In order to realize the technical purpose, the efficient screening device for corn seeds comprises a bottom board, a support, a sliding rail, a collection case I, a collection case II, an iron screening box, a sliding block, a rack, a sector gear, an electromagnet, a string, an arc-shaped connecting rod, a supporting rod, a rotary motor, a barrel cam, a milling groove, a clamping block, an L-shaped guide board, a bearing pedestal I, a gear motor, a winding drum, a bearing pedestal II, a top board, a servo motor, a bearing pedestal III, a nut, a bearing pedestal IV, a fixing board, a rotary shaft and a lead screw. The support, the sliding rail, the collection case I and the collection case II are sequentially arranged on the top of the bottom board from left to right. The efficient screening device for corn seeds has the effects of being high in separating speed and efficiency and convenient and flexible to adjust.

The invention discloses a mixed light realization method. Mixed light is formed by mixing light emitted by at least two light sources. The method comprises the following steps of: 1, calculating color tristimulus values of the light emitted by the light sources respectively; 2, changing the light energy ratio of the light emitted by the light sources for many times, and calculating a chromaticity value of the mixed light under each light energy ratio; 3, recording each light energy ratio and each chromaticity value obtained by the step 2 in a one-to-one correspondence way to form a light energy ratio-chromaticity value data table; and 4, searching for a corresponding light energy ratio from the light energy ratio-chromaticity value data table according to a required chromaticity value, and controlling the light sources to emit the light according to the corresponding light energy ratio. By the method, the mixed light with various chromaticity values and adjustable luminance can be flexibly and accurately obtained in a wide color gamut.

The invention relates to a self-insulation concrete hollow building block mold and a manufacturing method of building blocks. The self-insulation concrete hollow building block mold comprises a base plate, a mold frame and an upper pressing plate, wherein the mold frame is rectangular and is connected with the base plate through bolts; an insulation plate and a supporting plate are movably arranged in the mold frame; a plurality of uniformly distributed demolding holes and a plurality of fixedly arranged mold cores are arranged on the base plate; grooves corresponding to the mold cores are formed in the upper pressing plate. The self-insulation concrete hollow building block mold is reasonable in design, simple in structure and convenient to use; one-time forming of composite building blocks can be realized, and the product quality and the production efficiency are improved; meanwhile, the self-insulation concrete hollow building block mold can be conveniently and flexibly adjusted to meet the production requirements on the building blocks with different sizes.

The invention relates to a paste-like material charging machine which comprises a machine frame, a power system, a vertical type main shaft, a rotary table and buckling mechanisms. The rotary table is horizontally and fixedly mounted at the upper end of the vertical type main shaft. The power system is mounted on the machine frame and drives the vertical type main shaft to horizontally rotate. The buckling mechanisms are mounted on the rotary table through machine head vertical plates. A wire feeding mechanism and a clamping mechanism are arranged on the left side and the right side of each buckling mechanism respectively. A cutting mechanism is arranged on the lower side of each buckling mechanism. The clamping mechanisms, the buckling mechanisms and the cutting mechanisms sequentially act so as to convey products to be sealed to buckling positions, conduct buckling sealing, and cut off and separate the adjacent sealed products, the cutting mechanisms, the buckling mechanisms and the clamping mechanisms sequentially retreat to the initial positions, and the wire feeding mechanisms feed metal wires to the buckling positions while the clamping mechanisms retreat. According to the paste-like material charging machine, the metal wires are used for replacing formed buckles so as to seal barrel-shaped plastic film objects charged with paste-like materials such as emulsion explosives and water-gel explosives, so that the manufacturing cost of the explosives is reduced, and the corresponding equipment structure is simplified.

The invention relates to a viscous paste extruding and dehydrating device, the applied range of which includes but not limited to urban sludge dehydration and oily sludge solid-liquid separation and drying of an oil field. The device main body manly comprises a dehydrating piston, a filter element scraper device, an end face seal, a dehydrating container and a hydraulic system, wherein the dehydrating piston carries out reciprocal rectilinear motion in a cavity of the dehydrating container so as to extrude and push and discharge materials; the filter element scraper device carries out circumferential rotary motion in the cavity of the dehydrating container so as to clean and auxiliary-dehydrate a filter screen; the end face seal carries out reciprocal rectilinear motion in the cavity of the dehydrating container so as to seal and discharge materials; the dehydrating container is used for separating mud and water by virtue of the built-in filter screen; the hydraulic system provides required power and motion control for the whole viscous paste extruding and dehydrating device. The viscous paste extruding and dehydrating device provided by the invention has the characteristics of little heat consumption, high dehydrating effect, strong material adaptability, high degree of automation control and the like.

The invention provides a piezoelectric oil injector driving device capable of being adjusted online. The piezoelectric oil injector driving device comprises a man-machine interaction module, a microcontroller, a DAC conversion unit and a driving voltage closed-loop control circuit. The man-machine interaction module is used for setting a driving voltage parameter value of a piezoelectric oil injector online and sending the driving voltage parameter value to the microcontroller connected with the man-machine interaction module. The microcontroller is used for generating a signal controlling the driving voltage closed-loop control circuit to work. The output end of the DAC conversion unit is connected with the piezoelectric closed-loop control circuit. The piezoelectric closed-loop control circuit is used for charging a piezoelectric oil injector under the condition that the piezoelectric oil injector is limited by the maximum value of charging current in the process from action starting to oil injecting, so that the driving voltage of the high end of the piezoelectric oil injector becomes small from large until the driving voltage reaches the driving voltage corresponding to the set driving voltage parameter value and is maintained in the oil injecting process. The driving voltage closed-loop control circuit is further used for discharging of the piezoelectric type oil injector. According to the piezoelectric oil injector driving device capable of being adjusted online, online flexible control over the driving voltage of the piezoelectric oil injector is achieved, and therefore compared with the traditional manner of frequently replacing hardware devices, simplicity and rapidness are achieved, and efficiency is high.

The invention relates to an invisible screen window structure with a screw limiting invisible gauze reel structure. The invisible screen window structure comprises an invisible gauze box, a gauze net central round tube, an upper invisible gauze box cover, a lower invisible gauze box cover, a spring, a spring shaft sleeve, an adjustable nut, an adjustable limiting shaft lever and the like, wherein the gauze net is reeled between the invisible gauze box and the gauze net central round tube; the spring is mounted on an upper shaft lever on the gauze net and a spring plug; the gauze net central round tube passes through upper and lower shaft sleeve clamping grooves, a spring blocker clamping groove and an adjustable nut clamping groove by means of a clamping point of the central round tube; and a screw-type limiting device can be mounted on the upper and lower shaft levers of the gauze net. When the reel screen window is pulled, the gauze net central round tube and the shaft sleeve rotate to retract the gauze net; when the gauze net is pulled in place, the nut convex points and the screw convex points on the screw limiting device are mutually limited so that the gauze net central round tube does not rotate; and an anti-mosquito gauze net between the gauze net of the gauze net box and a handle is in a tense state, and the anti-mosquito gauze net does not deform under the action of the wind so as to realize the effect of resisting wind and mosquitoes. As the screw-type limiting device is mounted in the invisible gauze shaft sleeve, a good wind-shielding effect can be realized only by additionally arranging a screw limiting member on the original structure of the gauze net, and the difficulty in the industry of resisting wind for the invisible gauze net is solved.

The invention discloses a numerical control film rotary cutter which comprises a tool body, a sliding seat, a spindle box, a tail seat box and a numerical control system, wherein a tail seat sleeve is arranged on the tail seat box; a forwarding and retreating control device of the tail seat sleeve, a clamping and unclamping control device of the tail seat sleeve and a pressure relay are arranged in the tail seat box; the forwarding and retreating control device of the tail seat sleeve comprises a first oil cylinder, a first speed regulation valve, a first piston rod and a first solenoid valve; the clamping and unclamping control device of the tail seat sleeve comprises a second oil cylinder, a second speed regulation valve, a second piston rod, a rack shaft, a screw and two clamping blocks; both the first speed regulation valve and the second speed regulation valve comprise pressure reducing valves and throttling valves, and the reducing valves and throttling valves are in series connection. By means of the numerical control film rotary cutter, plastic workpieces can be installed and clamped by one step and positioned accurately, adjustment is convenient and flexible, total-order machining can be achieved, degree of automation is high, accuracy and production efficiency are greatly increased, and product quality is guaranteed.

The invention belongs to the field of fuel-cell catalysts, and relates to a three-dimensional porous Fe-N-C catalyst based on cetyl trimethyl ammonium bromide as a carbon material pore-forming agent and a preparation method. The three-dimensional porous Fe-N-C electrocatalyst is obtained through high-temperature calcination of o-toluidine as a C source and an N source, FeCl3.6H2O as a metal source, CTAB as a soft template and SiO2 as a hard template under an N2 atmosphere. In the preparation process, the size and the shape of a micelle can be accurately controlled through changing the concentration of the CTAB, a three-dimensional interconnected porous structure with a lot of active sites exposed on the surface can be finally formed after the templates are removed due to CTAB micelle decomposition after high-temperature calcination, the quantity of the active sites for catalytic oxygen reduction reaction is ensured, the mass transfer requirements can be met and improvement of the ORR activity of the catalyst is facilitated. Compared with a traditional Fe-N-C electrocatalyst, the three-dimensional porous Fe-N-C catalyst has the advantages that the three-dimensional porous structure of the catalyst is more beneficial to oxygen transfer and adsorption, the preparation process is flexible and controllable, the raw materials are cheap and available, massive production is facilitated and the three-dimensional porous Fe-N-C catalyst has relatively high practical value.

The invention discloses a lifting base frame structure. The lifting base frame structure comprises a base frame, an upper frame, a middle frame, a first telescopic mechanism and a second telescopic mechanism, wherein one end of the middle frame is hinged with the base frame, the other end of the middle frame is hinged with the upper frame, one end of the first telescopic mechanism is hinged with the base frame, the other end of the first telescopic mechanism is hinged with the middle frame, one end of the second telescopic mechanism is hinged with the base frame, and the other end of the second telescopic mechanism is hinged with the upper frame. According to the lifting base frame structure, the first telescopic mechanism and the second telescopic mechanism are matched, so that the height and the inclination angle of the upper frame can be adjusted, the adjustment is continuous and stable, and the adjustment range is wide.

A flexible jaw swing arm non-expansion drum device belongs to the technical field of rolling mills. A jaw power plant is articulated on a support of the jaw power plant at one side of a winding drum (11) by a pin shaft c (14) passing through a hydraulic cylinder (13); a jaw locating device is arranged as a bow block (4); the top at the upper end of the bow block is provided with a flexible jaw board (6) which is fixed by a bolt b (7); a fixed jaw board (8) is fixed at the upper end of the winding drum by a bolt c (9) and is positioned at the position corresponding to the flexible jaw board; the bottom at the lower end of the bow block is articulated on the a support of the jaw locating device at the other side of the winding drum by a pin shaft a (3); and the piston rod end of the hydraulic cylinder is connected with the upper end of the bow block by a connector (10). In the invention, according to practical production requirements, the pressure of the hydraulic cylinder is adjusted so as to change the clamping force of the jaw; and by the movement of the piston of the hydraulic cylinder, the opening and closing of the flexible jaw board and the fixed jaw board are realized, thus completely solving the problem of oil leakage at the jaw of the winding drum.

The invention discloses a presser foot height self-adaptive adjusting method, and belongs to the technical field of embroidery machines. The method comprises the following steps that S1, the current of a presser foot driving motor is detected during embroidering of a first needle, and if the current is suddenly increased, it is determined that the presser foot is in contact with an embroidery material; and S2, the presser foot height of a subsequent needle is determined according to the increased current value. According to the method, the proper presser foot height can be automatically adjusted according to the embroidery material attribute, the preset step is omitted, and the embroidery efficiency and the embroidery quality are improved.

The invention discloses a shelf assembly of a refrigerator and the refrigerator with the shelf assembly. The shelf assembly comprises a first shelf and a second shelf, wherein the second shelf is connected with the first shelf through a suspension arm assembly, the second shelf can be moved between the extending position and the retraction position, and the second shelf is positioned under the first shelf and is vertically separated from the first shelf when the second shelf is in the extending position, and is positioned under the first shelf and is adjacent with the first shelf when the second shelf is in the retraction position. The shelf assembly of the refrigerator has the advantage that by arranging the suspension arm assembly, a user can conveniently and flexibly adjust the relative position between the second shelf and the first shelf, so as to sufficiently utilize the space in the refrigerator.

The invention relates to the technical field of road pavement marking, in particular to a road pavement marking method on the basis of a road pavement guide line marking device. The road pavement guide line marking device comprises a bottom plate. A storage shell is arranged on a side of the upper end of the bottom plate, a ball is connected with the lower end of a threaded rod, a movable plate isconnected with the outer side of the ball by a ball groove, the end, which is far away from a first pump, of a discharge pipe penetrates a through hole and is connected with a spray gun, and withdrawal barriers are inserted in two sides of the movable plate. The road pavement marking method has the advantages that to-be-marked pavements can be swept by a sweeping brush, accordingly, marking effects can be improved, manual sweeping can be omitted, and the work efficiency can be improved; the to-be-marked pavements can be washed by a spray nozzle, accordingly, sticky objects can be brushed awayby the sweeping brush, and the marking effects can be improved; the storage shell has a heating function, and accordingly raw materials can be prevented from being cooled and solidified in long-timeuse; original guide lines can be cleared, the road pavement guide line marking device is simple in structure and convenient to use, energy can be saved, the amount of hand labor can be reduced, and the marking efficiency can be improved.

The invention relates to dust removing equipment, in particular to a movable dust removing vehicle which comprises a traveling mechanism, a control mechanism, a drive motor, an assembling base and atleast one dust absorbing mechanism. The control mechanism and the drive motor are fixedly arranged on the upper end face of the assembling base. The dust absorbing mechanism is arranged below the assembling base. The dust removing equipment further comprises two fixing frames, two rotating shafts, two rotating rollers, a first transmission belt, a second transmission belt, two first thread connecting rods, two first thread connecting pipes, a first fixing part, two second thread connecting rods, two second thread connecting pipes and a second fixing part. According to the movable dust removingvehicle, by means of the arrangement, the drive motor is driven by the second transmission belt to drive the rotating shafts to rotate and meanwhile drives the first transmission belt to rotate, thus, the dust absorbing mechanism is driven to move in a reciprocating manner in the length direction, and fly dust in all areas can be adsorbed dynamically. The position of the movable dust removing vehicle can be adjusted conveniently and flexibly, the use limitation is low, the dust removing effect is good, and practicality is good.

The invention relates to the technical field of rubber cutting, in particular to a longitudinal rubber cutting machine. The longitudinal rubber cutting machine comprises a rack. Two slide rails are arranged on the rack. A horizontal working platform is arranged on the slide rails. Side walls are arranged at the two sides of the working platform. A cross arm is arranged above the side walls. A pressing block is arranged above the working platform. An air cylinder extending downwards vertically is arranged on the cross arm. The extending-and-contracting end of the air cylinder is fixedly connected with the pressing block. Two or multiple round saw webs are sequentially arranged on the rack in the direction of the slide rails. The positions, corresponding to the round saw webs, on the working platform, the pressing block and the side walls are each provided with a groove. The height of the groove in each side wall is greater than the maximum height of the portion, exposed above the working platform, of each round saw web. According to the longitudinal rubber cutting machine, through design of the round saw webs with the heights increased progressively, one-time cutting of thick solid rubber is achieved; high precision is achieved in the cutting process; and the situations of smoke formation, tackiness, rubber performance reduction and the like caused by generation of excessive heat can also be avoided.

The invention provides a device for mounting and dismounting shaft parts. The device comprises a base, a lifting mechanism and a horizontal adjustment stand, wherein a movable part is mounted at the bottom of the base; the lifting mechanism is mounted on the base; the horizontal adjustment stand is mounted at the top end of the lifting mechanism; an adjustable support is arranged on the horizontaladjustment stand and the adjustable support comprises at least two support mechanisms arranged in the length direction of the horizontal adjustment stand; the support mechanisms comprise two supportstructures which are moved relatively; and the two support structures are commonly encircled into a positioning space for bearing the shaft parts. The device for mounting and dismounting shaft parts disclosed by the invention can be adapted to mounting and dismounting of the shaft parts of multiple specifications, and can be conveniently and flexibly adjusted in the multiple directions; and moreover, the mounting and dismounting difficulty is reduced, and damage to the shaft parts is reduced.

The invention discloses an LED (Light Emitting Diode) desk lamp holder. The LED desk lamp holder comprises a bottom plate, wherein a light source cavity is arranged on the bottom plate, an LED light source structure is fixedly arranged in the light source cavity, and light transmitting components are arranged at the upper end of the LED light source structure. The LED desk lamp holder can be combined with any light transmitting component, the structure is simple and novel, and the style is diversified, flexible, random and very creative. Light is irradiated on various light transmitting components, the light transmitting components become light emitting bodies capable of emitting various colors of light, and various light and shape effects are combined, so that various atmospheres are created, the ornamental value is high, the use is flexible, and the range of applications is wide. White LED beads or RGB (Red, Green, Blue) beads are used as LED beads, or the white LED beads and the RGB beads are all adopted. The LED desk lamp holder further comprises a remote controller, various light effects can be transformed through the remote controller, various light colors and various lighting intensities can be regulated, and gradual change and sudden change among various light effects can also be realized. The LED desk lamp holder has the advantages of flexible and varied styles, complete functions, high simplicity and convenience in use and wide application range.

A single event effect testing device based on a laser accelerator comprises a femtosecond laser device, a laser transmission system, a laser focusing system, an ion acceleration system, an ion beam shaping focusing system, a single event effect testing system and a vacuum target chamber system. Laser pulses generated by the femtosecond laser device are focused on an acceleration target of the ionacceleration system to generate a high-energy ion beam after passing through the laser transmission and focusing system, the ion beam shaping and focusing system is used for shaping and focusing the ion beam, the ion beam is transmitted to the single event effect testing system, and single event effect testing is achieved. Laser-driven accelerated ions are applied to the field of single event effect testing, and the device has the advantages of being table-type, flexible in direction adjustment, rich in particle variety, wide in energy spectrum, controllable in energy and the like, and can beapplied to space radiation environment simulation and the like.

The invention discloses an engineering vehicle battery heat management system and a control method. The engineering vehicle battery heat management system comprises a battery pack, the battery pack is provided with a water inlet and a water outlet, and the water inlet is connected with a water pump; the engineering vehicle battery heat management system further comprises an electronic three-way valve A, an electronic three-way valve B, a radiator, a plate exchanger and a heater; the first end of the electronic three-way valve A is connected with the water outlet, the second end of the electronic three-way valve A is connected with the first end of the electronic three-way valve B through the radiator, and the third end of the electronic three-way valve A is connected with the first end of the electronic three-way valve B through the plate exchanger; the second end of the electronic three-way valve B is connected with the water inlet through the heater, and the third end of the electronic three-way valve B is directly connected with the water inlet; the water inlet is connected with an inlet temperature sensor and a water pump; and the water outlet is connected with an outlet temperature sensor. The engineering vehicle battery heat management system has the following advantages that: 1, the battery heat dissipation mode can be automatically switched according to the environment temperature and battery temperature; 2, heat management of batteries in a full temperature range can be realized; and 3, the heat management system is convenient and flexible to adjust, high in applicability and high in reliability.

The invention discloses an axial pressing locking device, which comprises a pressing shaft (1) and a pressing shaft sleeve (5), wherein one end of the pressing shaft (1) is inserted into a sliding cavity of the pressing shaft sleeve (5), the cross section of a sliding cavity of the pressing shaft (1) and the pressing shaft sleeve (5) adopts an anti-rotation shape, a rotating element is also arranged on the pressing shaft sleeve (5), the rotating element and the pressing shaft (1) are coaxial and are connected through screw threads, and an anti-rotation regulating element is also arranged between the pressing shaft sleeve (5) and the rotation element so that the pressing shaft sleeve (5) and the rotating element are locked after the rotating element is regulated to a proper position. The axial pressing locking device has the advantages that the firm positioning of the regulation of the pressing shaft (1) can be conveniently realized, the structure is relatively simple, the use is convenient, the installation of components is convenient, and a hanging tool can be precisely positioned.

The invention relates to an automobile seat accessory, in particular to a clutch type manual waist support adjustor for an automobile seat. The adjustor comprises an upper shell, a lower shell, a stay wire, a wire wheel, a shaft sleeve and a shifting fork; the adjustor also comprises a clutch block arranged in the shaft sleeve and a pressure spring arranged in an inner hole of the clutch block, the shaft sleeve is sheathed on a braking terminal of the wire wheel; the clutch block with the pressure spring is arranged in the shaft sleeve; one end of the pressure spring in the clutch block pushes against the interior of the hole of the clutch block, and the other end of the pressure spring pushes against the inner wall of the braking terminal of the wire wheel; a pushing terminal is arranged below a shifting fork, one side of the pushing terminal is provided with two contact surfaces; and during installation, the pushing terminal is inserted in the shaft sleeve and corresponds to one end of the clutch block and the braking terminal of the wire wheel. Due to the adoption of the structure, the clutch type manual waist support adjustor has the advantages that the operation is labor-saving, the adjustment is convenient and flexible, the structure is simple and reasonable, the cost is low, the production is easily controlled, the product percent of pass is high.

The invention discloses a controllable small-signal voltage source plate, which comprises a power circuit, an upper computer, a serial communication circuit, a single-chip microcomputer, a digital-to-analogue conversion circuit, a reference voltage source circuit, a signal processing circuit and a second-order filter circuit, wherein the power circuit is connected to the single-chip microcomputer; the single-chip microcomputer is connected to the upper computer through the serial communication circuit; the input end of the digital-to-analogue conversion circuit is connected to the single-chip microcomputer and the output end of the digital-to-analogue conversion circuit is connected to the signal processing circuit; the reference voltage source circuit is connected to the digital-to-analogue conversion circuit; and the signal processing circuit is connected to the second-order filter circuit. An output voltage signal can be precisely controlled through the upper computer and the single-chip microcomputer, the manual adjustment of the voltage signal is not needed, and the adjustment is convenient and flexible; through a digital-to-analogue converter, the signal error is reduced and the signal precision is improved; through the second-order filter circuit, the signal jitter is reduced, so that the signal is more stable when the signal is output.

The invention discloses an eccentric variable diameter combined flange. The flange comprises a first flange body, an inner wall of the first flange body is fixedly connected with a connecting cloth surface, a first folding rod is fixedly connected with a front surface of the first flange body and is located at the side surface of the connecting cloth, a movable ball is movably connected to the topof the first folding rod, a second folding rod is rotatably connected to the side surface of the movable ball, and the second folding rod is fixedly connected to the connecting cloth surface. The flange can connect the first flange body and the second flange body by the arranged connecting cloth surface, a fastening ring and a straightening steel wire can ensure the better connection stability ofthe connecting cloth surface when the flange needs to be changed, the set of the movable ball can make the adjustment of the first folding rod and the second folding rod more flexible and convenient,great convenience is provided for the trouble of changing the mounted flange for different types of tubes, and the use is more flexible and convenient.

The invention discloses a total-space electromagnetic regulation and control metasurface and a metasurface unit. The metasurface comprises a first electromagnetic wave coupling/decoupling part, a transmission layer and a second electromagnetic wave coupling/decoupling part which are arranged in sequence. A first patch is arranged on the surface of the first electromagnetic wave coupling/decoupling part; the transmission layer is conducted with the first electromagnetic wave coupling/decoupling part and the second electromagnetic wave coupling/decoupling part through the transmission line structure; the transmission layer is provided with an adjustable element which is used for dividing guided electromagnetic waves in the transmission line structure into reflected waves and transmitted waves and regulating and controlling the amplitude and the phase; and the second electromagnetic wave coupling/decoupling part is provided with a second patch. The invention aims to overcome the problem that rapid and accurate electromagnetic wave regulation and control cannot be realized in a conventional metasurface, and provides a method for regulating and controlling the amplitude phase and the polarization state of transflective electromagnetic waves. Through the method, the amplitude and phase of electromagnetic waves in a specific polarization state can be adjusted in real time.

The invention relates to a display device for electronic commerce teaching. The display device comprises a base, a first stand column, a second stand column and a display board; the first stand columnand the second stand column are symmetrically and fixedly connected to the top of the base; rotating shafts are arranged on the inner sides of the tops of the first stand column and the second standcolumn; a positioning insertion rod is arranged on the side face of the first stand column; the positioning insertion rod penetrates through the first stand column and is sleeved with a spring, and the spring is arranged on the inner side of the first stand column; a first supporting rod and a second supporting rod are arranged on the two sides of the display board respectively, sleeves are arranged on the first supporting rod and the second supporting rod respectively; the sleeves are rotationally connected to rotating shafts; a rotating disc is further arranged on the first supporting rod; aplurality of insertion holes are formed in the rotating disc; the positioning insertion rod can be inserted into the insertion holes to fix the display board. By means of the positioning insertion rod and the rotating disc, the angle of the display board can be conveniently and flexibly adjusted, people with different heights and different positions can use and watch the display board more conveniently; and the display device is reasonable in structural design and can be used conveniently and fast.

The invention provides a cloth dragging device of a sewing machine, belonging to the technical field of machinery. The problems that the existing sewing machine is small in application range, complex in structure, high in manufacturing cost, inconvenient to operate and the like are solved. The cloth dragging device of the sewing machine is arranged at the machine head of the sewing machine; a machine needle is arranged at the lower part of the machine head; the cloth dragging device comprises a fixed cloth dragging wheel assembly which is fixed at one side of the machine needle; a moving cloth dragging wheel assembly is arranged at the other side of the machine needle; and an adjusting mechanism which enables the moving cloth dragging wheel assembly to move back and forth in the horizontal direction so as to approach to or move away from the fixed cloth dragging wheel assembly is arranged between the moving cloth dragging wheel assembly and the machine head. The cloth dragging device of the sewing machine has the advantages of high working efficiency, good sewing quality, wide application range and the like.