14results about How to "Avoid over grinding" patented technology

The invention relates to the technical field of flour processing, in particular to a flour mill for flour processing, which comprises a grinding body, the grinding body is provided with an inner cavity, a mounting cover is hinged to the top of the grinding body, a bottom box is fixed on the inner bottom wall of the grinding body, and the bottom box is provided with a material cavity. According to the flour mill for flour processing, the driving source drives the rotating shaft to rotate, the rotating shaft drives the top ring to stably rotate around the axial direction of the rotating shaft through meshing transmission of the linkage fluted disc and the second outer gear ring, and then the top ring drives the cylinder, the annular cylinder and other components to synchronously rotate; and the first grinding plate on the cylinder can uniformly cover materials on the surface of the filter screen, so that the situation that local materials are excessively ground and are not fully ground is avoided, and flour is uniformly ground.

The present application belongs to the field of non-ferrous metal dressing process, and relates to a grinding-flotation short process separation method for processing fine molybdenite. The process uses a high-pressure roller mill and a tower mill crushing and grinding process to replace the fine crushing and two-stage continuous ball milling operation in the traditional crushing and grinding process, and uses a flotation column to replace a flotation machine for flotation operation, thereby simplifying the production process flow of molybdenite. The present application has the advantages that the high-pressure roller mill and the tower mill change the crushing and grinding mode of the ore, significantly reduce the crushing and grinding energy consumption, and more effectively protect the flaky structure of molybdenite. The particle size distribution of the grinding product is reasonable, and the amount of fine and micro-fine particles (-20 μm) is reduced, thereby creating good conditions for the flotation operation. The flotation column is used for flotation, compared with the flotation machine, the recycling of middling slurry is reduced, the fine molybdenite that has been dissociated is fully recovered, and the recovery rate of molybdenite is improved. In addition, the flotation column flotation is beneficial to obtaining high-grade concentrate product, and improves the separation index and economic benefits of molybdenite.

This invention provides a special manufactured sand production process, with the following specific steps: Step 1, fine crushing; Step 2, finished product screening and powder selection; Step 3, special sand mixing and shipping. In this invention, the output from the vertical roller mill sand making machine undergoes primary powder selection. After selecting sand with a particle size <0.15mm, finished product screening is performed, reducing the screening load on the high-frequency vibrating screen, reducing screen hole clogging, and improving the screening efficiency of the high-frequency vibrating screen. Next, secondary powder selection is performed on the output with a particle size <0.6mm after finished product screening, again selecting sand with a particle size <0.15mm. The primary and secondary powder selections ensure that sand with a particle size <0.15mm is selected. Finally, a targeted tertiary powder selection is performed, and the output with a particle size <0.075mm is stored in a stone powder silo. This invention sets up a process flow that combines a high-frequency vibrating screen as the finished product screen with tertiary powder selection, effectively ensuring the product quality of special manufactured sand and laying the foundation for adjustable gradation of special manufactured sand.

This invention belongs to the field of bearing processing technology and discloses a high-precision metal bearing casting processing device, including a chassis and an ultrasonic generator. The ultrasonic generator is located inside the chassis, and a lower grinding disc is provided on the top of the chassis, while an upper grinding disc is provided on top of the lower grinding disc. This invention utilizes a first fixed plate, a first pressure valve, and a second pressure valve. By taking advantage of the diameter and conductivity of the steel balls, a segment or passage is formed between the steel balls and the first fixed plate and the chassis, thereby controlling the opening and closing states of the first and second pressure valves. A powerful instantaneous airflow impacts the steel balls, causing them to detach. This ensures that standard-compliant steel balls can be promptly detached from the lower and upper grinding discs, preventing over-grinding. Furthermore, the use of gas to propel the steel balls allows for the detachment of balls without affecting the movement of other steel balls.

This invention discloses a ceramic ball mill, relating to the field of ball mill technology, specifically a ceramic ball mill comprising a ball mill body. Multiple non-connected inner plates are evenly hinged to the inner circumferential surface of the ball mill body, and each inner plate forms a temporary storage chamber for temporary material storage between itself and the inner circumferential surface of the ball mill body. Through the coordinated arrangement of the inner plates, temporary storage chambers, telescopic components, and filter ports, timely screening, temporary storage, and periodic recirculation of qualified fine materials can be achieved. This effectively eliminates the "buffer layer" formed by qualified fine materials from hindering the contact between the grinding balls and coarse particles, preventing over-grinding of qualified materials. The agitator column and agitator rod cause the inner plates to vibrate at high frequency, improving the screening efficiency of qualified fine materials passing through the filter port, preventing filter port blockage, and enhancing the uniformity of material dispersion within the ball mill body.

This utility model relates to the technical field of dental medical devices, and more particularly to a polishing head with interchangeable heads. It includes: a body with an internal drive motor and a speed-changing mechanism, the drive motor and the speed-changing mechanism being connected in a transmission connection; and a head, including a straight head and an elbow, which can be selectively and detachably connected to the front end of the body. The straight head or elbow has a working component inside, which is connected in a transmission connection to the speed-changing mechanism. The drive motor can drive the speed-changing mechanism to rotate, thereby rotating the working component. This utility model provides a polishing head with interchangeable heads. By using a detachable connection between the head and body, and allowing the straight head and elbow to be selectively connected to the front end of the body, users can easily select and quickly change between the straight and elbow heads according to their needs, thereby obtaining a larger operating space or a better operating field of vision.

The application relates to the technical field of abrasive equipment, in particular to a tank grinding barrel, which comprises a tank body, the tank body comprises an outer shell body, the outer shell body is internally provided with a containing cavity, an inner shell body is fixedly arranged in the containing cavity, and a gap is kept between the inner shell body and the containing cavity; wherein the inner shell body is internally provided with a grinding cavity capable of containing to-be-ground powder, a through discharge hole is arranged on the cavity wall of the grinding cavity, the two ends of the discharge hole are respectively communicated with the grinding cavity and the containing cavity, and powder with a particle size smaller than that of the discharge hole in the grinding cavity is moved into the containing cavity through the discharge hole; the technical problem that the particle size of part of the ground silicon carbide powder is too small is solved, and the technical effect that the particle size of the ground silicon carbide powder is avoided from being too small is achieved.

The utility model relates to the field of ceramic production, in particular to a ball-milling screening machine for ceramic preparation, which comprises a treatment barrel and a rotating shaft, the rotating shaft is rotatably connected inside the treatment barrel, the outer side of the rotating shaft is slidably connected with a screening barrel, and one side of the screening barrel is provided with a connecting plate. Two guide rods used for driving the screening barrel to rotate are fixed to the other side of the connecting plate, a spring is fixed between the connecting plate and the screening barrel, and an inclined plate is arranged on the other side of the screening barrel. A rotating shaft rotates to drive a connecting plate and two guide rods to rotate, then a screening barrel is driven to rotate, a sliding rod is driven to slide along an annular sliding groove in an inclined plate, a spring is compressed and then rebounds, so that the screening barrel reciprocates along the two sides of the rotating shaft, the positions of a grinding medium and a ceramic material are changed, and the grinding medium and the ceramic material are more fully mixed; the grinding uniformity is improved, ceramic materials with qualified sizes can be discharged more quickly, excessive grinding is avoided, and the grinding effect is improved.

The utility model provides a fine processing device for preparing kaolin from coal gangue. The fine processing device mainly comprises a rack, a feeding mechanism, a grinding mechanism, a plurality of deflection pressurizing mechanisms and a material returning mechanism, the rack is arranged in a plant; the feeding mechanism is arranged on the rack; the grinding mechanism is arranged on the rack to receive the coal gangue material guided from the feeding mechanism and grind the coal gangue material; the plurality of deflection pressurizing mechanisms are connected with the grinding mechanism so as to enable the grinding mechanism to form a grinding gap which periodically changes in the circumferential direction; the material returning mechanism is arranged on the periphery of the grinding mechanism and communicates with the feeding mechanism so as to conduct particle grading on the coal gangue materials ground by the grinding mechanism and send coarse materials back to the feeding mechanism. By means of the arrangement, the multiple deflection pressurizing mechanisms enable the grinding mechanism to form the grinding gaps changing in the circumferential direction, coal gangue materials can be timely pulled away by the material returning mechanism after being ground, fine materials are separated out, and the problem that the grinding device excessively grinds the coal gangue materials is solved.

This invention belongs to the field of mineral resource recycling technology, specifically disclosing a beneficiation method for recovering ultra-low-grade scheelite from molybdenum tailings. For refractory scheelite with severe alteration and mudding, the method employs pre-slurry conditioning, enhanced pretreatment with reagents moved forward, followed by grinding and classification of the raw ore. By combining collectors, the refractory scheelite is synergistically recovered, ultimately obtaining a tungsten concentrate with a grade >26%, achieving a comprehensive actual recovery rate of 77%. This invention's process achieves full recovery and utilization of refractory scheelite resources in tailings, while reducing the operating costs of refractory ore recovery, creating considerable economic and social benefits.

The utility model discloses a quartz product high accuracy grinding equipment relates to quartz product production technical field, including grinding bin, the lower end fixedly connected with no. The utility model discloses a quartz product high accuracy grinding equipment relates to quartz product production technical field, including grinding bin, the lower end fixedly connected with no. The utility model discloses a quartz product high accuracy grinding equipment relates to quartz product production technical field, including grinding bin, the lower end fixedly connected with no. The utility model discloses a quartz product high accuracy grinding equipment relates to quartz product production technical field, including grinding bin, the lower end fixedly connected with no. The utility model discloses a quartz product high accuracy grinding equipment relates to quartz product production technical field, including grinding bin, the lower end fixedly connected with no. The utility model discloses a quartz product high accuracy grinding equipment relates to quartz product production technical field, including grinding bin, the lower end fixedly connected with no.

This utility model relates to a novel grinding disc-assisted grinding device for a sand mill, comprising a frame, a variable frequency motor fixedly installed inside the frame, a bearing seat fixedly installed above the frame, a drive shaft mounted on the bearing seat, the variable frequency motor and the drive shaft connected by a drive belt device, a grinding cylinder fixedly mounted on the bearing seat by grinding cylinder fixing bolts, and an end cap fixedly mounted on the other end of the grinding cylinder by end cap fixing bolts. The bearing seat, grinding cylinder and end cap form a sealed grinding chamber, in which a grinding disc, a conical spacer and a rotor are arranged. The conical spacer is a spacer with a tapered structure. The grinding disc and the conical spacer are mounted on the drive shaft, and the rotor is mounted at the farthest end of the drive shaft. The stirring device composed of the grinding disc, the conical spacer and the rotor rotates with the drive shaft. This utility model solves the problems of traditional cylindrical spacers not being able to fully utilize the grinding chamber space and having low grinding efficiency, and square spacers having high energy consumption and relatively insufficient uniform mixing ability.

The invention discloses a low-breakage-rate rice flexible grinding and hulling device which comprises a machine box, two hulling rollers matched to complete rice grinding and hulling are arranged in the machine box in parallel, and the two hulling rollers are independently connected with a driving motor; wherein one shelling roller is arranged to be a movable shelling roller, the two ends of the movable shelling roller are correspondingly installed on a movable frame through bearings, and the movable frame is movably assembled in the machine box in the horizontal direction. And the opening degree of the striker plate is synchronously changed. When the grinding distance is increased, the opening degree of the discharge hole is synchronously increased; and when the grinding distance is adjusted to be small, the opening degree of the discharge hole is synchronously reduced. The forward linkage mechanism ensures that rice with different grain sizes can enter a milling area in a single-layer tiled state, excessive milling caused by stacking is avoided, and the broken rice rate is reduced from the source.

This utility model relates to the field of grinding equipment technology and is a powder grinding machine, including a grinding box with a lower grinding disc inside. An upper grinding disc is fitted onto the lower grinding disc. The grinding box includes a box body and a box cover. A conical receiving hopper is connected to the bottom of the box body. A rotating ring is provided between the receiving hopper and the box body. A rack is fixed on the outer ring surface of the rotating ring, and the rack meshes with a gear. The gear is connected to a stepper motor. The lower grinding disc is fixedly connected to the rotating ring by multiple fixing rods. The upper grinding disc is connected to the box cover by fixing rods. A feeding channel is provided on the upper grinding disc. The box cover and the box body are connected by multiple vertical telescopic rods. The distance between the upper and lower grinding discs of this utility model can be flexibly adjusted, making it suitable for grinding materials of different particle sizes, improving the utilization rate of the equipment, and facilitating the cleaning of the upper and lower grinding discs; it also helps to improve product quality.