5results about How to "Avoid reduction" patented technology

The utility model discloses a kind of backflow-preventing self-closing check valve, including valve body, the inlet and outlet are opened in the valve body, buffering cavity and installation cavity are arranged in the valve body, the inlet is communicated with the buffering cavity, the outlet is communicated with the installation cavity, the buffering cavity is connected with installation cavity by passageway mouth, further include pressing plate and filter screen bucket, the pressing plate is set in the installation cavity, the pressing plate is used to block the passageway mouth, the filter screen bucket is set in the buffering cavity, the volume of the filter screen bucket is less than the volume of buffering cavity, the bucket mouth of the filter screen bucket is towards the passageway mouth, the bucket bottom and part of lateral wall of the filter screen bucket are medium flow channel.This kind of check valve has following beneficial effects: by adopting the bucket bottom and part of lateral wall of filter screen bucket can be as the passageway of medium flow, can increase flowing area, reduce the probability that foreign matter in medium blocks filter screen bucket, improve the reliability when filtering.

The utility model discloses a gear shifting system and agricultural machinery. An output shaft of a driving part of the gear shifting system is in transmission connection with a driving shaft of a first pump; an output shaft of the hydraulic motor is in transmission connection with an input shaft of the gearbox; two first communication ports of the hydraulic motor are communicated with two oil ports of the first pump in a one-to-one correspondence manner; the switch control valve, the hydraulic motor and the first pump are arranged in parallel; two second communication ports of the switch control valve are communicated with two oil ports of the first pump in a one-to-one correspondence manner; the output shaft of the driving part is further in transmission connection with a driving shaft of the second pump, an oil inlet of the second pump is communicated with the oil tank, an oil outlet of the second pump is communicated with a loop formed by the hydraulic motor and the first pump to supplement oil to the loop, and the oil outlet of the second pump is further communicated with a gear shifting oil inlet of the hydraulic gear shifting assembly to be used for driving gear shifting so as to enable the gearbox to shift gears. The gear shifting system is simple in structure, low in production cost, good in collaboration, good in working stability and reliability and capable of rapidly and efficiently shifting gears and prolonging the service life of the gear shifting gear ring.

The utility model discloses a putty powder spraying machine for an outer wall surface of a building. The putty powder spraying machine comprises a trolley and a grinding mechanism, a feeding mechanism is arranged on the bottom wall of the trolley, a connecting pipeline is arranged at the front end of the feeding mechanism, a spray gun is fixedly connected to the front end of the connecting pipeline, and a supporting frame is fixedly connected to the front side of the bottom wall of the trolley; the grinding mechanism comprises a discharging base, a grinding cylinder, a grinding assembly and a discharging hopper, the discharging base is fixedly connected to the upper surface of the supporting frame, the rear side of the discharging base communicates with the middle of the feeding mechanism through a discharging pipeline, the grinding cylinder is fixedly connected to the upper end of the discharging base, and the interior of the upper end of the grinding cylinder is in an inverted cone shape; according to the putty powder spraying machine for the outer wall surface of the building, putty powder can be ground before spraying, the texture of the putty powder is finer and smoother, and meanwhile the situation of material blocking is reduced.

This invention relates to the field of screening equipment technology, specifically a vibrating screen for hot-drilling equipment with negative pressure dust collection. It includes a support frame, to which circumferentially distributed first elastic elements are fixedly connected. These first elastic elements are collectively fixed to a screening cylinder. A screen cylinder cover is fixedly connected to the support frame. The screening cylinder is fixedly connected to a first screen, a second screen, and a bottom baffle. Both the first and second screens have an array of circumferentially distributed screen holes. A third screen is rotatably connected to the screening cylinder. An air supply module is installed on the support frame. This invention uses the screening cylinder, second screen, third screen, and bottom baffle to form a sealed cavity. The air supply module continuously supplies air into the sealed cavity, increasing the pressure within the cavity. When the screen holes on the second and third screens connect, the lower airflow impacts the blocking particles upwards, achieving the purpose of clearing the blockage caused by hot-drilling particles.

The utility model relates to a kind of feeding device.The feeding device includes bunker and screw conveying mechanism, by the end of the bunker with bottom material port is extended to the position where conveying pipe is equipped with feed inlet, and is sealedly connected with feeding port, butterfly valve and relevant connecting structure between the bunker and screw conveying mechanism are saved, the connecting structure between the bunker and screw conveying mechanism is simplified, the structure of feeding device is more simple, compared with traditional butterfly valve connection, bottom material port can be set as big as possible under the premise of not exceeding conveying pipe, reduce the probability of plugging between bunker and conveying pipe, so that the discharge is uniform and stable;When using, if no need to feed, then driving motor does not work, at this time screw rod does not rotate, so the material in bunker will be stored at the feed inlet of conveying pipe, so as to ensure that material can be stored in bunker;If need to feed, just need to start driving motor, at this time screw rod rotates, can convey the material at feed inlet to the direction of discharge port.