245results about How to "Stable and firm" patented technology

A lace winding device includes a base, a spool rotatably mounted in the base, a lace having two distal ends each extending through the base and each secured on the spool, a limit barrel mounted on the base, a drive member rotatably mounted in the limit barrel and connected with the spool to rotate the spool, and a ratchet block movably mounted on the limit barrel and engaging the drive member. Thus, the drive member is rotated in one direction only by limit of the ratchet block so that the spool is driven by the drive member to rotate in the positive direction only and cannot be rotated in the opposite direction so as to wind the lace easily and quickly.

The invention provides a cement-based composite material used for a 3D printing technology as well as a preparation method and application thereof. The cement-based composite material is prepared from the following raw materials based on the total weight of the composite material: 33%-40% of cement, 0%-8% of inorganic powder, 32%-38% of tailing machine-made sand, 2.5%-3% of a high-molecular polymer, 0.1%-0.5% of a water reducing agent and 16.7%-20% of mixing water; a composite thickening time control agent, a thixotropic agent, a volume stabilizer and the like are added into a mixture to prepare an inorganic composite material; and then the inorganic composite material can be directly pumped into a 3D printer for building to be applied to construction. The cement-based composite material is an inorganic material and the materials are easily available; a lot of industrial waste materials can be used; therefore, the cement-based composite material is low in cost, energy-saving and environment-friendly; the condensation time can be flexibly controlled, and the material has super early strength, good caking property and strong stability; the requirements of 3D printing construction continuity of the building and the building strength are met so that the house building has good global stability and use safety; and the application and popularization of 3D printing technology can be greatly promoted.

The invention discloses a bi-component cement based composite material for 3D (three dimensional) printing as well as a preparation method and application thereof. The bi-component cement based composite material for 3D printing comprises a component A and a component B, wherein the component A is prepared from 34 to 40 percent of sulphate aluminium cement, 0 to 6 percent of inorganic powder, 40 to 44 percent of tailing machine-made sand, 2.5 to 3 percent of high-molecular polymer and the balance of a retarder, a water reducer, a size stabilizer, a defoaming agent and water, the pumping performance can be well kept for a long time, an industrialized process of pre-stirring production in a mixing plant, transportation, and using in a construction site can be realized; the B component is prepared from a coagulate promoting agent, a thixotropic agent, a defoaming agent and water, the component is stable in form and can be stored for a long time or produced in a concentrated manner. After A and B are respectively pumped in a 3D printer, through high-speed stirring and being mixed by an extrusion head, the composite printing material can be extruded out, the time of coagulation is short, the strength is high, the adhesion is good, the stability is strong, the constructive continuity and building strength requirements of building 3D printing can be met, the industrial production and promotion of the cement based 3D printing material are facilitated, and the application of a 3D printing technology in buildings can be effectively promoted.

The F track running structure has its suspension running frame made of two parallel vertical beam and anti side rolling module, through four corners installed support arm linked to form the rectangular suspension running frame module, suspension electromagnetic iron connected with support arm at both sides vertically, each has emergency rescue wheel supported by the hydraulic cylinder, sliding platform connected through the steel cable and the support arm with inner side having forcing guide device through the installation base, combining several assembled suspension running frame modules together. It ensures the train follow F track all the time through air spring, side rolling resistance, horizontal block device, forced guide device to realize the movement decoupling. It reduces the vibration from the track and the system itself, applies to all kinds of specified geometrical torque and unsmoothness, greatly reduced in vehicle noise. It has flexible line selection, low in noise, low in cost, applicable for running between stations.

An armrest assembly includes a mounting bracket, a limit member mounted on the mounting bracket, and an armrest support mounted on the limit member. The bottom of the mounting bracket is provided with a slideway which has a first side provided with an upright limit face and a second side provided with an oblique limit face. The limit member has a first side provided with an upright mating face abutting the upright limit face and a second side provided with an oblique mating face abutting the oblique limit face. Thus, the upright mating face and the oblique mating face are limited by the upright limit face and the oblique limit face respectively, so that the limit member is moved in the slideway smoothly and stably without producing any vibration to facilitate movement of the armrest support relative to the mounting bracket.

The invention discloses a portable six-rotor-wing aircraft used for bridge detection, and relates to the field of unmanned aerial vehicles. The portable six-rotor-wing aircraft comprises an aircraft body, six foldable aircraft arm assemblies, a looking-up camera tripod head, a two-axis laser tripod head, an ultrasonic obstacle avoiding device and a retractable landing gear, wherein each foldable aircraft arm assembly is composed of a motor, a paddle, a collision preventing structure, an aircraft arm and a foldable structure. In order to achieve the purpose of bridge detection, the looking-up camera tripod head is developed and designed to be used for photographing flaw information of a bridge bottom face and bridge piers; the laser scanning range finder tripod head is designed and used for scanning bridge bottom two-dimensional features and positioning the aircraft in the bridge bottom non-GPS environment; the ultrasonic obstacle avoiding device is designed and used for avoiding obstacles for the aircraft under complex environments; the foldable aircraft arm assemblies can be folded and unfolded conveniently and quickly, so that the problem that a large-size unmanned aerial vehicle is not convenient to carry is effectively solved.

A lace winding device includes a base, a spool rotatably mounted in the base, a lace having two distal ends each extending through the base and each secured on the spool, a limit barrel mounted on the base, a drive member rotatably mounted in the limit barrel and connected with the spool to rotate the spool, and a ratchet block movably mounted on the limit barrel and engaging the drive member. Thus, the drive member is rotated in one direction only by limit of the ratchet block so that the spool is driven by the drive member to rotate in the positive direction only and cannot be rotated in the opposite direction so as to wind the lace easily and quickly

An armrest assembly for a chair includes an armrest support, a mounting sleeve mounted on the armrest support, an armrest mounted on the mounting sleeve, and a lifting device mounted between the armrest support and the mounting sleeve to lock or unlock the mounting sleeve onto or from the armrest support. Thus, the mounting sleeve is movable relative to the armrest support so as to adjust the height of the armrest so that the height of the armrest can be adjusted freely to support a user's arm comfortably. In addition, a user only needs to pull the armrest upward to adjust the height of the armrest so that the user can adjust the height of the armrest easily and quickly in an energy-saving manner.

A machine tool has a pair of guide rails and a pair of upper and lower ball screws. No forces are transferred between a beam of a double column frame and a movable unit. The guide rails are spaced from each other and disposed on a bed, and the movable unit is horizontally movably supported on the guide rails. The upper and lower ball screws are mounted respectively on upper and lower portions of the double column frame for moving the movable unit horizontally. Even when the beam is deformed by flexing downwardly by gravity, the movable unit moves stably and smoothly at a high speed to machine a workpiece highly accurately without being adversely affected by the deformation of the beam.

An armrest assembly includes a mounting bracket, a limit member mounted on the mounting bracket, and an armrest support mounted on the limit member. The bottom of the mounting bracket is provided with a slideway which has a first side provided with an upright limit face and a second side provided with an oblique limit face. The limit member has a first side provided with an upright mating face abutting the upright limit face and a second side provided with an oblique mating face abutting the oblique limit face. Thus, the upright mating face and the oblique mating face are limited by the upright limit face and the oblique limit face respectively, so that the limit member is moved in the slideway smoothly and stably without producing any vibration to facilitate movement of the armrest support relative to the mounting bracket.

The invention relates to a diamond abrasive wire cutting fluid for a semiconductor precision sheet. The raw materials of the diamond abrasive wire cutting fluid consist of the following compositions in parts by mass: 30-80 parts of polyalcohol, 0.01-0.5 parts of hydrogen inhibitor, 0.01-0.5 parts of acid, 0.1-1.0 part of surfactant, 1.0-10.0 parts of dispersing agent, 0.01-0.5 parts of preservative and 10-35 parts of deionized water, wherein the polyalcohol is mixture of propylene glycol and polyethylene glycol with ratio being 1 to (1:2) and the molecular weight of the polyethylene glycol is between 100 and 600. The diamond abrasive wire cutting fluid for the semiconductor precision sheet has the characteristics that the hydrogen is effectively inhibited from being generated, the lubricating effect is remarkable, the cleaning is easy to conduct, the cost is low and the performance is stable.

The invention discloses an electric insulation material for a lamellar detection element of a gas sensor and a preparation method thereof. The electric insulation material is characterized by being prepared by mixing two or more alpha-phase Al2O3 with different particle sizes, wherein one alpha-phase Al2O3 has the particle size of 20-100nm and the mass duty ratio of 40-70%, and the other one or more than one alpha-phase Al2O3 has the particle size of 2-30 micrometers and the mass duty ratio of 30-60%. When the electric insulation material is used, a solvent, a binder, a plasticizing agent and a lubricating agent are added into the electric insulation material prepared in the invention to prepare ceramic slurry, a suspending liquid or sol, which are arranged between a heating unit and a detecting unit of a gas detection element through a silk screen print method, a blade casting method, a coating method or a spraying method so as to form an insulation unit. The electric insulation material of the invention has good insulation property, good heat conduction property and strong impact resistance, is used for detecting elements, and can prolong the service life, reduce power consumption and improve mechanism property of the elements.

An electrical card connector, in which a shielding member introduced therein has a tab using for abutting against a top of a guide rod so as to limit an upward displacement of the guide rod. This configuration can prevent the guide rod from shaking up and down. The guide rod is thus securely fixed. On the other hand, the guide rod further includes a guide groove slideably mated with a corresponding guide rib of an insulating housing, which make the slider slide reliably in a front-to-back direction. Moreover, the slider further includes a spring switching for abutting against and fixing an inserted electrical card. Thereby, the electrical cards can be engaged in the receiving cavity reliably.

A blade assembly is connected to a robot arm for transmission of semiconductor chips and includes a blade, a top cover, a bottom cover, and two pivot units each including a pivot arm, a first bearing, and a second bearing. Thus, the positioning flange of the mounting ring of the pivot arm is sandwiched between the first bearing and the second bearing and the inner washer is sandwiched between the inner ring of the first bearing and the inner ring of the second bearing, thereby preventing the first bearing from pressing and jamming the second bearing due to a pressing action of the urging cap, so that the pivot arm is pivotable smoothly and stably.

The invention relates to an epoxy-pouring full-insulation solid isolating switch, which comprises an isolation body, a grounded contact, an isolation contact, a middle contact, an isolation moving contact, a driving screw rod, a fixed nut and a driving gear part, wherein the grounded contact and the isolation contact are arranged at two ends of the isolation body respectively, the middle part of the isolation body is provided with the middle contact, the upper end of the isolation contact is connected with a bus contact through a bus-bar, the bus contact is arranged on the top of the isolation body, and the isolation moving contact is always contacted with the middle contact through a watch chain sensing finger. The isolation switch slides between two positions of the middle contact and the isolation contact or the middle contact and the grounded contact to form the conduction or the isolation grounding of the isolating switch. The entire isolating switch is poured into a fully-sealed integral structure with epoxy resin.

The invention discloses a shape memory alloy-driving bionic wall climbing robot leg unit. The shape memory alloy-driving bionic wall climbing robot leg unit comprises bionic legs, a foot module, a shock absorption spring, a bi-directional shape memory alloy driving device and a single-directional shape memory alloy driving device, wherein the front-back and left-right movement of the bionic legs are driven by virtue of the bi-directional shape memory alloy driving device and the single-directional shape memory alloy driving device. The invention also discloses a shape memory alloy-driving bionic wall climbing robot driven by shape memory alloy. The bionic wall climbing robot comprises the bionic wall climbing robot leg unit. The shape memory alloy driving device adopts a bionic structure,so that the wall climbing movement of the robot on a medium surface is realized; the driving device is simple in structure, light in weight and flexible in movement; and the foot module adopts an ironmagnetic ball body, no surplus leg raising and re-absorption action is needed in the movement process of the bionic leg, the leg can provide a stable supporting force and absorption adsorption force,the supporting point is stable, the center of gravity of the robot is slight in change, and the gait planning is simple.

A folding framework for the cutter includes two opposite and symmetric brackets. Each of the brackets has a first crossed rack and a second crossed rack, that connect across and swing at their intersections. Two limiters mounting at the intersections and crutching between the crossed racks are used to limit the spreading angle of the crossed racks. Each of the first and the second crossed racks has a upper slide-bar and a lower stock. The distance of sliding telescopically of the upper slide-bars in the lower stocks is controlled by a particular device. When the brackets fold crosswise and the upper slide-bars slide into the lower stocks respectively, the mass of the folding framework would be minimums. That would save the holding space for the folding framework.

A combined device for instantaneous control of power transfer between two cores of a direct current network and for powering an alternating current engine. The device includes: an assembly of two three-phase inverters, each including three switching cells connected to the engine, which engine includes three stator windings connected to the two three-phase inverters, and a module for controlling the assembly, which ensures both an adjustable direct current power transfer and enables stabilization of the direct current voltage of one of the two cores if it is not connected, and the control of the engine.

The invention relates to an automobile drum type brake heat dissipation system, and belongs to the technical field of automobile brakes. The automobile drum type brake heat dissipation system comprises an axle, a hub, a brake drum and a brake shoe, wherein the hub is connected with the brake drum, the brake shoe is configured in an inner cavity of the brake drum, and the automobile drum type brake heat dissipation system is characterized in that a wind wheel or a fan blade is arranged in the inner cavity of the brake drum, an air inlet is formed in the outer side of the brake drum, and an air outlet is formed in the other side of the brake drum. The automobile drum type brake heat dissipation system achieves forced ventilation heat dissipation in the inner cavity of the relatively-sealed brake drum, the exterior cold air can continuously enter the inner cavity of the brake drum, the effects of heat dissipation and cooling are achieved, and therefore performance stability and normal operation of the automobile brake system are ensured. The forced ventilation of the inner cavity of the brake drum enables the inner cavity of the brake drum to keep clean and the good ventilation effect, and the heat dissipation effect of the automobile drum type brake can be further improved. The automobile drum type brake heat dissipation system is simple in structure, reasonable in design, reliable in use performance, safe and reliable in operation, long in service life, capable of conveniently conducting refit on an existing automobile, and beneficial to saving energy and protecting environment.

A collapsible stand includes a platform for supporting a machine, two first legs each having a top end pivotally connected to the platform, two second legs each of which is pivotally connected to each first leg and has a top part slidably inserted through a sleeve of the platform, at least one springy or biasing member and a locking device. The springy or biasing member is retained in a sleeve-like or coaxial manner on retained in a sleeve-like manner one of the second legs. The locking device is connected to the platform for fixing the second legs in position after spreading the stand open such that the first legs and second legs support the platform at a predetermined height.

A trailer system for radiation imaging, comprising a trailer including a frame, a plurality of guide wheels and connecting hooks, and anchoring devices, the frame comprises an intermediate section in the form of a H-shaped frame beam, a left frame bed and a right frame bed are connected to hinge shafts provided on four corner portions of the H-shaped frame beam, a positioning recess is provided centrally in an upper surface of each left and right frame beds, a wheel-catching means is provided at a rear end of each positioning recess, an upslope and a downslope daises are provided on a front end and a rear end of each of the left and the right frame beds, a support plate is provided at an outside end of each of the left and right frame beds, and a striking block is provided centrally at an outside of each support plate. The present invention requires low installation accuracy of the rails, and employs simultaneously moveable upslope and downslope daises convenient for mounting and using, thus increasing reliability, stability and practicability of the trailer.