31results about How to "Reduce rotation speed" patented technology

The application relates to the technical field of sodium fluorosilicate preparation, in particular to a device for continuously producing sodium fluorosilicate, which comprises a precipitation tank, a high-position tank one, a high-position tank two, a reaction box, a dissolving tank one and a dissolving tank two, a joint is fixed to the upper end surface of the precipitation tank, the precipitation tank is communicated with the high-position tank one through a pipeline, the bottom of the high-position tank one and the high-position tank two is communicated with the reaction box through a pipeline, and the high-position tank two is communicated with the dissolving tank one and the dissolving tank two through a pipeline; a stirring mechanism is arranged in the reaction box, the stirring mechanism comprises a stirring cavity which is arranged in the reaction box, and a sealing plate is screw-connected to the front end surface of the reaction box; the application is provided with the stirring mechanism and the crushing assembly; during the mixing reaction, block materials are generated; at this moment, the rotating speed of the motor is slowed down; the stirring blades are intermittently magnetically attracted through the electromagnets; the stirring blades are slightly displaced on the surface of the rotating shaft; and the block materials between the adjacent stirring blades are extruded and crushed.

The application relates to the technical field of flow channel cleaning, and discloses a dam water inlet flow channel floating object cleaning device which comprises a fixing plate arranged at a dam water inlet flow channel opening, a water inlet opening is formed in the fixing plate and communicates with the dam water inlet flow channel opening, a filter plate is arranged in the water inlet opening, fixed blocking strips are fixedly installed on the filter plate, a salvage mechanism for cleaning garbage and a driving mechanism for driving the salvage mechanism to work by using water flow are arranged on the fixing plate, the salvage mechanism comprises movable rods, limiting rods, U-shaped frames and a plurality of first arc-shaped fixed strips, a plug groove and a limiting groove are formed in the upper end of the fixing plate, and the movable rods and the limiting rods are movably installed in the plug groove and the limiting groove respectively. The dam water inlet flow channel floating object cleaning device aims to solve the problems that, in the prior art, accumulated floating objects in front of a dam are cleaned by manual work, the efficiency is low, there are hidden dangers, and tree branches are easily stuck on the filter screen under the impact of water flow and are difficult to clean.

The utility model discloses a kind of storage basket and cabinet with self-stopping limiting mechanism, storage basket includes: basket, supporting mechanism and self-stopping limiting mechanism;Self-stopping limiting mechanism includes: installation shell, limiting ring and arc block, installation shell has installation cavity, arc block and limiting ring arc block are installed in installation shell, and the arc surface of arc block is in abutment with limiting ring, limiting ring is driven and moves by arc block;Self-stopping limiting mechanism is installed at the bottom of basket, supporting mechanism is provided with T-shaped block matched with self-stopping limiting mechanism, and the side recess of T-shaped block forms limiting clamping groove;Limiting ring is driven by basket and adapted to be in abutment with T-shaped block.The utility model is driven by setting self-stopping limiting mechanism, self-stopping limiting mechanism cooperates with T-shaped block, after rotating to specified position, it can reduce speed even stationary at specified angle, reduce the risk that storage basket is installed in corner position, cabinet door and basket collision after user closes cabinet door.

The utility model discloses a power transmission line bird repeller belongs to bird repeller technical field. A kind of power transmission line bird repeller, including the mounting frame of detachable connection on electric power tower, the top of mounting frame is provided with bird repelling component, bird repelling component includes rotating base rotation connection in the top of mounting frame, hemispherical cover body is fixedly connected on rotating base, the open end of hemispherical cover body is fixedly connected with reflector, friction block is slidably connected in rotating base, friction block and the circumferential surface of mounting frame are attached, rotating base is rotationally connected with force arm, one end of force arm is abutted with friction block, the other end of force arm is provided with counterweight piece;The utility model force arm cooperation friction block, so that the application can form passive deceleration effect under storm condition, friction block extrudes support rod to make rotating base rotation speed reduce, avoid hemispherical cover body fracture or bird repeller disintegration, prevent the problem of the appearance of the debris after disintegration threat power transmission line insulation safety.

The utility model relates to the field of automobile parts, concretely relates to an electronic mechanical double unlocking structure, including handle seat, handle that rotates set on handle seat, micro -switch and be used for making handle reset's first gear spring, be equipped with rotation part on handle, and the probe of micro -switch is contacted with rotation part, still including swing claw that rotates set on handle seat, the second gear spring of swing claw rotation resistance, swing claw's end is the opposite end, and the opposite end is opposite with the tail end of handle, when handle rotates in the rotation range of electronic unlocking, the tail end of handle and the opposite end are in the separate state, when handle rotates in the rotation range of mechanical unlocking, the tail end of handle and the opposite end are in the opposite state, through the scheme of the application, realize first gear spring and second gear spring different shaft setting, facilitate electronic mechanical double unlocking structure's assembly, reduce assembly difficulty.

The utility model belongs to the technical field of rotary sprayers, and particularly relates to a four-stage speed reduction rotary sprayer which comprises a rotary nozzle assembly, a shell, a rotary driving assembly and a water inlet connector, the rotary driving assembly is located in the shell, the rotary nozzle assembly is connected with the output end of the rotary driving assembly and rotationally arranged at the upper end of the shell, and the water inlet connector is connected with the rotary nozzle assembly. The water inlet connector is connected with the lower end of the shell, a water inlet channel is reserved between the shell and the rotary driving assembly, a water inlet gap is reserved between the rotary driving assembly and the rotary nozzle assembly, and the water inlet gap is communicated with the water inlet channel. Liquid enters from the water inlet connector and then is sprayed out from the rotary nozzle assembly through the water inlet channel and the water inlet gap in sequence. The four-stage speed reduction rotary nozzle is reasonable in structure, and the instantaneous water pressure of a water pipe entering the rotary nozzle can be properly reduced.

The utility model provides a wooden packing box assembly support platform, include: the assembly platform is provided with packing box body on the assembly platform, be provided with the conveyer belt on the assembly platform still include: unloading assembly, unloading assembly sets up on the assembly platform, unloading assembly includes the connecting rod setting on the assembly platform, is provided with locking part on the connecting rod, is provided with the sliding block on the connecting rod, is provided with the support plate on the sliding block, is provided with the unloading board on the support plate, the guide component is provided on the unloading board. The utility model discloses through rotating handle, can drive connecting rod rotation in this way, can make the card block from the card slot and separate, make the weight of packing box body, can drive unloading board around the main shaft and rotate, the elasticity of spring can delay the rotation speed of unloading board at this moment, in this way can make unloading board can stably convey packing box body to the conveyer belt, can greatly reduce the carrying difficulty of staff.

The application discloses a drilling device with waste gas collecting function for coal mine exploration and relates to the technical field of coal mine drilling. The drilling device comprises a sliding frame, the sliding frame is rotationally connected with a rotating sleeve, the lower portion of the rotating sleeve is slidably connected with a first spline rod, the lower end of the first spline rod is fixedly connected with a drill cylinder, the lower portion of the first spline rod is fixedly connected with a first fixed plate, the first spline rod is provided with an elastic member, the two ends of the elastic member are fixedly connected with the rotating sleeve and the first fixed plate respectively, the sliding frame is fixedly connected with a support frame, the support frame is fixedly connected with a first driving motor, and the output shaft of the first driving motor is fixedly connected with a gear. The first elastic member is used for monitoring the extrusion force between the drill cylinder and the bottom layer, so that the transmission ratio between the third extrusion plate and the fourth extrusion plate and the second extrusion plate and the first extrusion plate is changed, the moving speed of the sliding frame is reduced, the drill cylinder is prevented from moving downwards at a speed that is too fast, the extrusion force between the drill cylinder and the bottom layer is prevented from increasing continuously, and the drill cylinder is prevented from being stuck in the bottom layer.

The utility model relates to the technical field of high-altitude operation safety protection, and discloses a falling protector. By arranging the centrifugal linkage assembly, when the rotating speed of the locking rotating wheel reaches or exceeds a preset centrifugal threshold value, the centrifugal linkage assembly can be started immediately, so that the buffering rotating wheel and the locking rotating wheel rotate synchronously, and the damping plate is fixedly installed between the outer wall of the buffering rotating wheel and the inner wall of the buffering groove; the damping plate acts on a damping medium located between the outer wall of the buffering rotating wheel and the inner wall of the buffering groove, a rotating damping structure is formed, mechanical energy is consumed, and therefore the rotating speed of the locking rotating wheel is reduced.

The utility model discloses crushing equipment for concentrated feed production, and belongs to the technical field of concentrated feed production. The device comprises a shell, a feeding port is formed in the front side of the shell, a plugging cover is arranged on the feeding port in a matched mode, a smashing cylinder is transversely and rotationally arranged on the inner side of the shell, an opening is formed in one end of the smashing cylinder and is aligned with the feeding port, the other end of the smashing cylinder is plugged, and screening holes are formed in the side face of the smashing cylinder. A smashing assembly used for smashing materials is rotationally arranged in the smashing cylinder, a driving mechanism used for driving the smashing assembly and the smashing cylinder to rotate oppositely is arranged on the shell, and a material receiving cavity is formed in the bottom in the shell. When the crusher is used, the motor drives the blade and the crushing cylinder to rotate reversely, so that the effect of relative rotation of the crushing cylinder and the transmission shaft and relative movement of the blade and the crushing cylinder are realized, the relative speed of the blade and the guide plate and the cutting efficiency are improved, and the possibility of contact between large materials and the blade is improved.

This invention discloses a paper dispensing deceleration mechanism and a tissue dispenser, comprising: a paper tube, a pressure roller, and a paper-pressing elastic component. The outer peripheral wall of the paper tube has at least one mounting groove extending axially along the paper tube. At least one pressure roller is provided, rotatably mounted in the mounting groove around its own axis, with both ends of the pressure roller located at opposite ends of the extending direction of the mounting groove. The paper-pressing elastic component acts between the pressure roller and the paper tube, providing a spring force to the pressure roller to move outwards from the mounting groove, causing a portion of the pressure roller to protrude from the outer peripheral side of the paper tube. When the external force for paper dispensing is removed, the rotational speed of the paper roll is effectively reduced, achieving a deceleration effect. Simultaneously, during paper dispensing, the pressure roller can rotate with the paper roll, effectively decelerating the paper roll while maintaining smooth rotation.

The application belongs to the technical field of cable recycling, and particularly relates to a cable insulation wire core metal conductor removing device, which comprises a center guide part, the center guide part comprises a fixed ring, a guide cylinder is fixedly installed at the center of the fixed ring, a plurality of rotating cylinders distributed at equal intervals are rotationally connected to the guide cylinder, arc-shaped blocks are slidably connected to the inner wall of the rotating cylinder, one side of the arc-shaped block in the interior of the rotating cylinder is rotationally connected to a center guide rotating cylinder parallel to the axis of the rotating cylinder through a rotating shaft, and a first hydraulic telescopic rod is fixedly installed at the end of the fixed ring. The weight block is lifted by the cable to compress the compression type hydraulic pump, the first hydraulic telescopic rod is retracted after the compression type hydraulic pump is compressed, so that the center guide rotating cylinder guides the cables with different diameters, and the bending degree of the arc surface of the arc-shaped block is smaller as the arc-shaped block is farther away from the inner inclined ring, so that the cables with different diameters are subjected to different guiding pressures of the center guide rotating cylinder.

The application discloses a shell manufacturing manipulator for investment casting, and relates to the technical field of investment casting equipment. The shell manufacturing manipulator for investment casting comprises a rotating disc arranged on a manipulator body, a U-shaped plate is fixedly connected to the bottom of the rotating disc, and the sidewall of the U-shaped plate is connected with two symmetrically arranged first moving plates through a moving mechanism. The shell manufacturing manipulator for investment casting is convenient for detecting the deformation of the wax mold module after clamping the wax mold module; the surface impurities of the wax mold module can be blown and cleaned, and the size of the outer contour of the wax mold module can be detected; when the size of the outer contour is large, the rotating speed can be appropriately reduced to avoid deformation; after each dipping is completed, the increase range of the weight after dipping can be detected, that is, the uniformity of dipping can be detected, so that the increase range is ensured to be within the required range, the thickness of the shell is ensured to be uniform, the situation that some parts are too thick or too thin is avoided, and the quality of subsequent casting and shell manufacturing is ensured.

The utility model provides a short-wave broadcast deviation switch with self-damping, and the switch comprises a reduction gearbox which is internally provided with a gear transmission mechanism, and the gear transmission mechanism is used for reducing the speed of inputted rotation power and transmitting the rotation power to an output end; and the self-damping device is arranged in the reduction gearbox and connected with the gear transmission mechanism of the reduction gearbox, and when the gear transmission mechanism of the reduction gearbox rotates, the self-damping device can generate a damping effect so as to slow down the rotating speed of the reduction gearbox. By additionally arranging the self-damping device, the problem that the high-power short-wave broadcast deflection switch is unreliable in the deceleration positioning process is effectively solved. The generator in the self-damping device is matched with the power resistor to work, so that a damping effect can be generated when the reduction gearbox rotates, the rotating speed is reduced, mechanical energy can be converted into electric energy, the electric energy is consumed through the power resistor, and effective utilization of the energy is achieved.

The utility model relates to a kind of aerospace optical remote sensing high-density quantization information imaging spectral scanning devices, it relates to spectral scanning technical field.The utility model relates to a kind of aerospace optical remote sensing high-density quantization information imaging spectral scanning devices, including base, still including moving device, support device and protection device, the top of the base is fixedly installed with device body, the bottom of the base is rotatably installed with moving wheel;Wherein, moving device includes connecting shaft, the connecting shaft is fixedly installed on the surface of moving wheel, the surface of the connecting shaft is fixedly installed with elastic telescopic block, the free end of the elastic telescopic block is hinged with connecting block, the bottom of the base is fixedly installed with sealing frame, the inside of the sealing frame is slidably installed with moving plate, the surface of the moving plate is fixedly installed with contact plate, can reduce moving speed in time when device body moving speed is too fast, improve the protection effect of device body.

The invention discloses a line pipeline restraining and positioning device for nursing, and relates to the technical field of nursing, the line pipeline restraining and positioning device comprises a base, the upper part of the base is provided with a plurality of cylinders, the inner sides of the cylinders are rotatably connected with a rotating plate, the upper part of the rotating plate is provided with two first restraining wheels, and the upper part of the rotating plate is provided with a supporting rod; a second restraining wheel is installed on the upper portion of the supporting rod, a releasing assembly is arranged on the cylinder body, the rotating plate and the second restraining wheel jointly, and the releasing assembly comprises a torsional spring jointly installed between the cylinder body and the rotating plate, a limiting plate movably connected to the inner side of the cylinder body, a plurality of protruding blocks installed on the outer side of the rotating plate and a semicircular plate movably connected to the upper portion of the cylinder body; by arranging the releasing assembly, when a line or a pipeline is restrained, positioned and pulled, the line or the pipeline can be rapidly responded and released, rapid releasing is achieved, part of pulling force can be offset through releasing of the line or the pipeline, and the situation that nursing work is interrupted due to disconnection after the line or the pipeline is pulled is avoided.

The utility model relates to a steel wire forcing device which comprises a fixing support, a guide wheel set, a brake disc, brake calipers and a controller, a cavity is arranged in the fixing support, the guide wheel set is arranged in the cavity and comprises at least two guide wheels, the guide wheels are in running fit with the fixing support, the brake disc is installed on a rotating shaft of the guide wheels, and the brake calipers are arranged on the brake disc. The brake caliper is installed on the fixing support and matched with the brake disc, the controller is arranged on the fixing support, and the brake caliper is electrically connected with the controller. According to the steel wire forcing device, in the steel wire guiding process, firstly, a steel wire is guided into the guide wheel set and wound on the guide wheels, the steel wire inlet and the steel wire outlet are formed in the fixing support, when the steel wire is not wound tightly, the brake calipers are controlled to brake, the rotating speed of the guide wheels is reduced, and then the output speed of the steel wire is reduced; the steel wire winding speed is larger than or equal to the steel wire output speed, and finally steel wire winding is tighter.

The invention relates to a belt breakage detection device and method and planetary stirring equipment, and belongs to the technical field of transmission monitoring of mechanical equipment. A speed measuring coded disc is arranged at the top of a revolution main shaft of the planetary stirring equipment, and induction magnetic discs are respectively arranged at the tops of two rotation main shafts; meanwhile, a Hall sensor fixed on a rack is used for detecting magnetic disk signals passing along with revolution of a main shaft, and revolution periods are counted in a segmented mode in cooperation with coded disc pulses. The problem that when the device is applied to belt detection of planetary stirring equipment, wiring of moving parts cannot be directly achieved is solved, and belt breakage detection under the multi-rotating-speed working condition is achieved.

The present application relates to the technical field of grinding and crushing, and particularly relates to a powder processing and shaping device and a magnesium oxide production system. The powder processing and shaping device comprises a rack, a grinding cylinder and a screening mechanism. The screening mechanism comprises a fixed plate group, a material distribution ring and a synchronous ring. The fixed plate group is fixed to the rack, the synchronous ring is rotationally matched with the fixed plate group, and the fixed plate group and the synchronous ring define an annular material distribution chamber. The fixed plate group is provided with filter holes, a return port and a discharge port. The filter holes are provided on the side of the fixed plate group in the axial direction of the grinding cylinder, allowing the material to pass through and preventing the grinding balls from passing through. The grinding balls cannot directly hit the fixed plate group under the action of gravity, reducing the damage to the side of the fixed plate group where the filter holes are provided. The material distribution ring is arranged in the annular chamber and rotates with the synchronous ring to screen the material. The powder with qualified particle size can be discharged in time, and the unqualified material is returned to the grinding from the return port, without the need for an external conveying mechanism to return the unqualified material, and the structure is more compact and has high integration.

The utility model relates to a label stripper which comprises two symmetrically-distributed vertical plates, a conveying roller is rotationally installed between the two vertical plates through a first shaft rod, a driving mechanism capable of driving the first shaft rod to rotate is arranged on the inner side face of the vertical plate on one side, and a stripping piece is installed between the two vertical plates. A shell is rotationally installed between the two vertical plates through a second shaft rod, a pressing roller is rotationally installed between the inner walls of the two sides of the shell through a third shaft rod, and when the shell is overturned to the position between the two vertical plates, the pressing roller abuts against the conveying roller; and a winding roller is arranged on the outer surface of the second shaft rod. Through the arrangement of the transmission mechanism, the driving mechanism can drive the conveying roller to rotate to convey label roll paper and simultaneously drive the winding roller to rotate to wind the label roll paper with stripped labels, so that the purpose of conveying and winding at the same time is achieved, manual intervention is not needed, the automation degree is improved, the labor intensity of operators is reduced, and the production efficiency is improved. And the purpose of continuous operation is achieved.

This application provides an angle-adjustable structure and a mobility scooter. The angle-adjustable structure includes a first rotating seat, a second rotating seat, a first elastic element, and a locking mechanism. The first rotating seat has a first toothed surface and a first mounting groove on its first mounting surface, and the second rotating seat has a second toothed surface and a second mounting groove on its third mounting surface. The first and third mounting surfaces are opposite to each other. The locking mechanism connects the first rotating seat and / or the second rotating seat, and is used to lock or unlock the first and second rotating seats. The first elastic element is installed in the first and second mounting grooves. When the first toothed surface rotates relative to the second toothed surface, the first elastic element generates a damping force opposite to the direction of rotation. The first elastic element can generate a damping force opposite to the direction of rotation, facilitating precise control of the rotation angle by the user.

This invention discloses a hinge for preventing hands from being pinched when closing a door, comprising a fixed hinge, a rotating hinge, a hinge shaft connecting the fixed hinge and the rotating hinge, and a damper disposed on the rotating hinge. The damper has a damping rod that can only be pushed by overcoming the damping force. A force converter is disposed between the damping rod and the fixed hinge, which is used to: convert the damping force F01 of the damper into an impedance force F that resists the rotational inertia force of the door closing, thereby increasing the impedance force F in the initial stage and bearing the component force F2 that increases the impedance force F, thereby weakening the component force F2.

The utility model relates to the technical field of copper rod machining equipment, in particular to a copper rod straightening device which comprises a rack. A straightening mechanism and a feeding mechanism are arranged on the rack; the feeding mechanism comprises a guide plate, the guide plate is obliquely arranged on the rack, the tail end of the guide plate is slidably connected with a clamping block, the bottom end of the clamping block is slidably connected with a driving block, the top end of the driving block is of an arc-shaped structure, the tail end of the driving block is fixedly connected with a buffer spring, and the side face of the guide plate is rotationally connected with a positioning rod. The copper rods can be automatically guided and fed through the arranged inclined guide plate structure, the copper rods are automatically moved to the conveying structure, manual operation is reduced, the copper rod feeding efficiency is improved, meanwhile, feeding of the copper rods can be positioned through the clamping block structure, the copper rods can be fed one by one, and the copper rod feeding efficiency is improved. And inclination and deviation of the copper rods caused by excessive feeding of the copper rods are avoided.

The utility model discloses a quantitative feeding device for organic silicon material production, which relates to the technical field of quantitative feeding devices and comprises a spiral feeding machine, a discharge pipe, a quantitative weighing barrel and a powder particle discharge control valve. The spiral feeding machine conveys the organic silicon material to a discharging pipe, and the organic silicon material falls into a quantitative weighing barrel below; the tension type transmission sensors monitor the weight of materials in the barrel in real time, and when the weight is about to reach the preset weight, the control system slows down the rotating speed of a screw of the spiral feeding machine, and accurate discharging is achieved; due to high-precision quantitative feeding, the strict requirement of organic silicon material production on the raw material ratio is met, and the product quality is improved; a closed or semi-closed structure and a dust collecting device effectively reduce dust pollution and guarantee the safety of a production environment; and due to the automatic quantitative feeding process, the production efficiency is improved, manual intervention is reduced, and the production problem caused by feeding errors is avoided.

This application provides a cooking appliance control method and a cooking appliance, belonging to the field of food processing technology. The cooking appliance includes a pot body with a cooking cavity, a frying basket disposed within the cooking cavity, and a hot air device capable of generating hot air to cook food. The control method includes: after entering the cooking stage, controlling the hot air device to start, generating hot air, and driving the frying basket to rotate through the force of the hot air; acquiring the cooking progress of the cooking appliance; and adjusting the working state of the hot air device based on the cooking progress to adjust the rotation state of the frying basket. This application determines the time to adjust the working state of the hot air device by acquiring the cooking progress of the cooking appliance, and adjusts the rotation state of the frying basket by changing the working state of the hot air device, so that the frying basket has different rotation states at different cooking stages, ensuring ideal food heating effect.

A cultivation rack for seedling cultivation belongs to the technical field of agriculture and aims to solve the problems that cultivation trays of an existing cultivation rack are generally static, seedlings close to a light source are sufficient in illumination when the cultivation trays are placed indoors, but seedlings far away from the light source are insufficient in lighting due to blocking of a cultivation rack body, so that the seedlings grow irregularly, and the cultivation cost is low. The device comprises a cultivation frame assembly, a plurality of cultivation disc assemblies are rotationally connected into the cultivation frame assembly, first synchronous wheels are fixedly connected to the cultivation disc assemblies, a clutch assembly is further connected to the cultivation frame assembly, a synchronous wheel system is driven by a driving assembly, and the synchronous wheels are driven by the driving assembly to drive the first synchronous wheels to rotate. The rotating shaft is driven by the synchronous belt, all the cultivation tray bodies rotate continuously, it is ensured that seedlings move to a daylighting point in turn, the rotating speed is low, centrifugal force is small, damage to the seedlings is avoided, daylighting of the seedlings is even, cultivation quality is improved, and growth difference is reduced.

The utility model relates to the technical field of conveying, specifically relates to a welding wire reel conveying device, include: support connecting plate, conveying assembly, conveying assembly is fixed in the top of support connecting plate, conveying assembly includes two side -by -side arrangement's frame, and the transmission plate for conveying welding wire reel is fixedly installed between two frame and is inclined, the upper and lower ends of transmission plate form the feeding end and the discharging end with frame respectively, and the first rotating plate is rotatably connected between two frame, and the one end of first rotating plate is close to transmission plate is the material receiving end, and the other end is the inductive end. The utility model discloses through conveying welding wire reel simultaneously, slows down the speed of welding wire reel and avoids the impact, can avoid the mutual impact of the offset welding wire reel when conveying welding wire reel, and simultaneously corrects welding wire reel and restores normal rolling route to convey through the electrification of guide rod, electric contact and electrification plate.

The invention provides a double-sided polishing method, double-sided polishing equipment and a silicon wafer, and the method comprises the steps: setting parameters, controlling the rotation speed of a bearing disc and the rotation speed of an upper fixed disc and a lower fixed disc, enabling the removal amount of the front surface of the silicon wafer to be greater than the removal amount of the back surface of the silicon wafer, and enabling the sum of the removal amount of the front surface of the silicon wafer and the removal amount of the back surface of the silicon wafer to be a target removal amount. According to the double-sided polishing method, the double-sided polishing equipment and the silicon wafer, the surface particle level of the silicon wafer obtained after polishing can be improved.

The present application belongs to the technical field of polishing and grinding, in particular to a polishing and grinding machine for vacuum cups. The machine comprises a machine bed, a support frame is fixed to the upper side of the machine bed, a sliding block is arranged on the upper side of the support frame, a first electric push rod is installed on the sliding block, a first connecting block is fixed to the telescopic end of the first electric push rod, a first fixing frame is fixed to the first connecting block, symmetrical rotating plates are rotatably connected to the first fixing frame, a connecting shell is fixed between the symmetrical rotating plates, an air bag is fixed to the outer side of the connecting shell between the symmetrical rotating plates, a friction sandpaper is detachably wrapped on the outer side of the air bag, and an air pump is installed on the upper side of the first fixing frame. The air pressure in the air bag is balanced by the air pressure balancing component, so that the pressure on each part of the outer side wall of the vacuum cup is always constant, thereby protecting the friction sandpaper on the outer side wall of the air bag.

The utility model discloses a premature infant intravenous infusion precise trace speed regulator which comprises a shell, a knob, a first gear, an intermediate gear set and an extrusion structure, the shell is hollow, and an infusion tube penetrates through the shell from top to bottom; the knob is arranged outside the shell; the first gear is arranged in the shell and is coaxial with the knob; the first gear, the intermediate gear set and the extrusion structure are sequentially meshed and connected to reduce the rotating speed of the extrusion structure; the extrusion structure comprises a fourth gear, a rotating disc and an extrusion rod, and the fourth gear is arranged on one side in the shell and engaged with the output end of the middle gear set; the rotating disc is rotatably arranged on the other side in the shell and is coaxial with the fourth gear, and a friction plate abutting against the inner wall of the shell is arranged on the rotating disc; and the extrusion rod is eccentrically arranged on the fourth gear and the rotating disc so as to extrude the infusion tube. The infusion flow can be accurately controlled, the cost is lower, the structure is simpler, and the operation is more convenient.