54results about How to "Increase sieving rate" patented technology

The invention discloses a method and special apparatus for improving surface purity and surface cleanliness of silicon carbide particles. The method is characterized in that cleaning and dust removal are conducted on the surface of silicon carbide through a physical method, namely, silicon carbide particle materials are pushed by strong airflow to rotate at a high speed and to be thrown up, the silicon carbide particle materials are processed through repeated collision and friction, the silicon carbide particle materials can be separated from suspension dust among the silicon carbide particle materials and surface adhesion dust, and finally the requirement for improving the surface purity and the surface cleanliness of the silicon carbide particle materials is met. According to the method, the surface purity and the surface cleanliness of the silicon carbide particle materials are improved through the physical method instead of a chemical method, the suspension dust among the crushed silicon carbide particle materials and the particle surface adhesion dust can be effectively removed, the production cost is reduced to a great extent, production efficiency of the back end working procedure is improved, zero emission of pollutants is basically achieved in the whole production process, and the foundation is laid for large-scale industrial production and realization of automatic control in the production process.

The invention discloses a pre-grading device and a vibration screening machine with the same and relates to the field of gravel screening machines. The pre-grading device comprises an air blower, a main grading cavity, a feeding channel and a plurality of discharging channels. The main grading cavity is provided with an air inlet, a feeding opening and a plurality of discharging openings, and an air outlet of the air blower is connected with the air inlet; the feeding opening is formed in the upper portion of the main grading cavity and connected with the feeding channel, and all the discharging openings are formed in the lower portion of the main grading cavity and are connected with the discharging channels in a one-to-one corresponding mode; and all the discharging openings are formed in an arrayed mode in the direction opposite to the air inlet along the air inlet, and the feeding opening corresponds to the discharging opening closest to the air inlet or is closer to the air inletthan the discharging opening. The vibration screening machine comprises a screen cloth device with a plurality of layers of screen clothes being vertical arranged at intervals and further comprises avibrating mechanism and the pre-grading device which are connected with the screen cloth device; the pre-grading device is arranged above the front section of the screen cloth device, and the front ends of all layers of the screen cloths, except the screen cloth of the bottommost layer, of the screen cloth device are each provided with a lower layer falling opening; and the discharging openings ofall the discharging channels correspond to all the screen clothes from top to bottom in one-to-one and layer-by-layer modes in the direction opposite to the air inlet along the air inlet, and the layer number of the screen clothes of the screen cloth device is matched with the number of the discharging channels.

The invention discloses a steel slag real-time circular iron removal and grinding method, which belongs to the technical field of steel slag comprehensive utilization, and includes the following steps: feeding and iron removal, coarse crushing and iron removal, fine crushing and iron removal, and grinding and iron removal, and finally the ground steel slag with the specific surface area of 400 m2 / kg-500m2 / kg, and the metallic iron content smaller than or equal to 0.3%. Through utilizing the steel slag real-time circular iron removal and grinding method provided by the invention, the steel slagreal-time circular iron removal is combined with the 'more crushing and less grinding' and the 'segmented grinding' technologies for steel slags, so that not only the metallic iron in the steel slagsis fully recovered, but also the grinding efficiency in the steel slags is further improved, the energy consumption is reduced, and steel slag micro powder is obtained.

The invention discloses screening equipment capable of keeping fertilizers dry. The screening equipment comprises a cylinder; a rotating shaft is arranged in the cylinder; a mounting plate is arrangedat the top of the rotating shaft, and is hinged with a first filter screen; mounting grooves are formed in two sides of the inner wall of the cylinder; connecting shafts are arranged in the mountinggrooves; the two ends of the first filter screen are connected with two connecting shafts; the first filter screen and the connecting shafts are connected through elastic elements; a second filter screen is arranged under the first filter screen, is connected with the rotating shaft, and can be rotated along with the rotating shaft; and multiple drying devices are arranged in the cylinder. Throughcombined effects of the first filter screen and the second filter screen, the screening rate of the fertilizers can be increased; and through the drying devices, the fertilizers are kept dry, and areprevented from bonding on the filter screens to block the filter screens.

The invention discloses a sieving and crushing integrated machine. The sieving and crushing integrated machine comprises a machine housing, a sieving and distributing machine (1) arranged at an upper part of the machine housing, and a sieving and crushing machine (35) arranged at a lower part of the machine housing, wherein the sieving and distributing machine (1) comprises a charge hole (2), an arc-shaped distributing plate (6), an iron remover (11), a transmission device, a flange type sieve shaft (4) and a filter sieve shaft (5); the sieving and crushing machine (35) comprises a main rotor, an arc-shaped counterattack sieve roller set, a particle size adjusting device and a transmission device; and a charge hole (36) of the sieving and crushing machine is positioned below a discharge hole (9) of the sieving and distributing machine. The sieving and crushing integrated machine has the following creative effects: the original two-stage crushing and one-stage sieving mode is changed to be a one-stage sieving and one-stage crushing mode, so that a system structure is simplified; problems of material adhesion and blockage, high iron content, low sieving and crushing efficiency, high power consumption, non-uniform ring hammer wear, unadjustable particle size, high difficulty in overhauling and replacement of spare parts, inconvenience in operation and the like are solved; and the sieving and crushing integrated machine is a major innovation of sieving and crushing equipment technology.

The invention relates to the technical field of tunnel construction, in particular to a device for soft soil foundation shield tunnel construction. The device for soft soil foundation shield tunnel construction comprises a shield body, a cleaning system and a segment assembling system, wherein the cleaning system is arranged in the shield body, and the segment assembling system is connected with the tail of the shield body; the segment assembling system is connected with the tail of the shield body through a mounting disc and comprises a pushing part and a clamping part, the pushing part is fixedly connected with the mounting disc, the clamping part is connected with the free movable end of the pushing part, and the clamping part clamps segments for splicing and using. According to the device for soft soil foundation shield tunnel construction and an using method, the problems that in the specific using process in the prior art, an existing urban underground pipeline is very complex, large-diameter pipe pieces are not suitable for being installed in tunnels with complex and changeable lines, small-diameter pipe piece construction in the prior art consumes much time, and the accuracy is difficult to grasp are solved.

The invention discloses a plant coloring agent and a preparation method thereof. The plant coloring agent is composed of 1-3 parts of a compound thickening agent, 12-18 parts of a compound mordant and 0.5-2 parts of soybean meal. The compound thickening agent comprises sesbania gum, guar gum or carrageenan. The compound mordant is prepared from copperas, tannic acid and water. The weight ratio of the sesbania gum to the guar gum is 9: 1, and the weight ratio of the sesbania gum to the carrageenan is 7: 3. The weight ratio of the copperas to the tannic acid is 9: 1. The invention also provides the preparation method of the plant coloring agent. The plant coloring agent is relatively good in printing performance, clear in pattern outline edge after fabric dyeing, good in permeability and relatively high in color fastness.

The invention discloses a decomposing tank scab cleaning and recovery method and a system thereof. The decomposing tank scab cleaning and recovery method comprises the following steps of (1) cleaning scabs manually, and (2) recovering and treating the scabs. The system comprises a scab discharging platform, a crusher, a ball mill, a vibrating screen, a slurry tank, a decomposing mother liquor tank, a distributing box and a flat plate filter, wherein the scab discharging platform is connected with the crusher through a conveying belt; the crusher is connected with the ball mill through the conveying belt; the ball mill is connected with the vibrating screen through a chute; the vibrating screen is connected with the scab discharging platform through the conveying belt; the slurry tank is arranged at the bottom of the vibrating screen, and is connected with the distributing box through a connecting pipeline; a charging pump is arranged on the connecting pipeline; the distributing box is connected with the flat plate filter; the decomposing mother liquor tank is connected with inlets of the ball mill and the charging pump through the hydraulic pipelines respectively; and hydraulic pumps are arranged on the hydraulic pipelines. The decomposing tank scab cleaning and recovery method and the system are reasonable in design, low in cost, and high in recovery rate, and have popularization values.

The invention discloses a spring type anti-blocking screen. According to the technical scheme, the spring type anti-blocking screen comprises a fixed frame and a spring, wherein the spring is arranged on the fixed frame, a fixedly connecting sleeve is arranged on the spring, the fixedly connecting sleeve is fixedly connected with a movable screen shoe, movable screen strip plates are arranged on the movable screen shoe, fixed screen strip plates are arranged at the upper part of the fixed screen shoe, movable screen strips of the movable screen strip plates are distributed between adjacent fixed screen strips of the fixed screen strip plates, the fixed screen strips and the movable screen strips are located on the same horizontal plane, and a slide carriage is arranged below the screen strips. The spring type anti-blocking screen is reasonable in structure, good in use effect, and capable of effectively promoting the screening percentage of a vibrating screen in screening clammy raw coal, coal slime, brown coal, coal gangue and other large materials, thus improving the overall screening efficiency of the vibrating screen.

The invention provides a multi-layer sectional type ratooning rice grain cleaning screen. The multi-layer sectional type ratooning rice grain cleaning screen comprises a cleaning screen frame, a shaking plate, an upper-layer woven screen, a middle-layer louver screen, a tail fish scale screen and a lower-layer woven screen, wherein the shaking plate, the upper-layer woven screen, the middle-layerlouver screen, the tail fish scale screen and the lower-layer woven screen are installed on the cleaning screen frame. The front end of the upper-layer woven sieve is connected with the tail end of the shaking plate, the front end of the tail fish scale sieve is connected with the tail end of the middle-layer louver sieve, and the tail fish scale sieve is obliquely arranged upwards; the middle-layer louver screen comprises a screen piece, a plurality of first straw-shaking strip groups and a plurality of second straw-shaking strip groups, each first straw-shaking strip group comprises two first straw-shaking strips which are distributed in a splayed shape, each second straw-shaking strip group is arranged above the screen piece and comprises a plurality of second straw-shaking strips whichare parallel to one another, and the second straw-shaking strips are arranged in the front-to-back direction; according to the invention, the grain screening rate can be improved, and separated materials with high water content can be subjected to layered diffusion.

The invention discloses powdery high-activity calcium oxide and a production process thereof, belonging to the technical field of the production of active lime. According to the adopted technical scheme, the production process comprises the steps of crushing limestone into small crushed materials with different sizes by virtue of a crushing machine, conveying produced coarse materials into a pulverizer by virtue of an electromagnetic vibration feeder, grinding the limestone into powder with the particle size of 0.1mm-3mm, storing the powdery limestone into a material bin, or directly conveyingthe powdery limestone into a multi-stage cyclone preheating cylinder for suspension type preheating decomposition, and conveying the powdery limestone into a rotary kiln for calcination, wherein a spiral distributor is further arranged in the rotary kiln and is used for uniformly distributing the materials in the rotary kiln, so that the 100% utilization of the limestone resource is realized, andthe large-scale production is realized. Advanced scientific instruments and techniques are applied to the whole production process of powdery high-activity calcium oxide, so that the production process of powdery high-activity calcium oxide is an efficient, high-quality and low-consumption modern calcium oxide production method which is accordant with environmental requirements and large-scale and automatic features.