53results about How to "Control collapse" patented technology

The invention relates to a mined out space dam-type filling method; after an overhand mining working surface is pushed forward 3-5m, a baffle is arranged behind a cut top row single-body hydraulic support post in a spanning way; flexible waterproof cloth is attached on baffle and is laid and extended towards a bottom plate and two lanes of the working surface, so that a separated mined out space is formed; high-water material is filled into the separated mined out space by grouting equipment; after the high-water material is solidified, the baffle and the single-body hydraulic support post are disassembled, and one-time filling can be finished; along with the advance of a coal mining working surface, the steps are repeatedly carried out for completing the filling for a plurality of times; after the coal mining working surface finishes mining, all devices of the working surface are disassembled, a closed wall is built between a transportation roadway and a track roadway, and finally, top tight filling is carried out to complete the filling operation of the whole mined out space. As a grouting pipe is used for flood irrigation of the separated mined out space, the filling liquid level is lifted, slurry can be in top tight filling rapidly, filling is dense, the effect is visualized, and the method is simple. Therefore, the mined out space dam-type filling method is applicable to the overhand mining working surface with smaller coal seam dip angle or higher mining height.

The invention relates to a material for reinforcement of coal and rock and a preparation process and application thereof. In the technical scheme, resol, a plasticizer, fire-resistance polyether and methanol are used as raw materials and are heated under alkaline conditions to form modified phenolic resin with an inter-penetrating structure through copolymerization and condensation, the modified phenolic resin is then mixed with an organic acid catalyst system by a pump, and the mixture is then poured into a broken coal and rock to be cured and to be closely combined with the coal and rock. The preparation process comprises preparation of the modified phenolic and preparation of the coal and rock curing material. The modified phenolic resin has low viscosity and can infiltrate into tiny cracks. The cured phenolic material has excellent bounding capacity and can achieve strong viscosity with the formation. Due to the excellent flexibility properties, the material can withstand the subsequent formation movement without retardant fire, thereby improving the safety of underground operation. Moreover, the material can not affect the mineability of coal, and can be easily planed and cut, thereby realizing the easy breakage of large coal lumps bonded together.

The invention discloses a welding device for photonic crystal fiber and a method thereof. A frequency controller (13) of a carbon dioxide laser modulating unit (8), a stress sensor demodulating unit (11) and a three-dimensional alignment controller and a clamp control unit (10) are connected with a processing and control element (9) of the welding device; mechanical transmission mechanisms of a lower three-dimensional motion V-shaped groove device (2) and an upper three-dimensional motion V-shaped groove device (5) are connected with the three-dimensional alignment controller and the three-dimensional alignment controller of the clamp control unit (10); the carbon dioxide laser modulating unit (8) transmits laser to a fiber output point (4) through a transmitting energy fiber (16) to weld a welded fiber (3). The method comprises the following steps of: 1) selecting a welding parameter according to information of a fiber structure; 2) adjusting a clamping force of the V-shaped groove clamp by using the information of the fiber structure; 3) performing a three-dimensional alignment to two fibers to be welded; 4) modulating a carbon dioxide laser by a frequency modulator with a set frequency to transmit laser to the position of welded fibers for welding through the transmitting energy fiber. The welding device for the photonic crystal fiber has the advantages of simple structure, strong capability of anti-interference of vibration, high sensitivity and easy manufacture, and is suitable for welding between photonic crystal fibers with different specifications and between the photonic crystal fiber and a conventional optical fiber.

The invention discloses microelectronic packages and associated methods of manufacturing. In one embodiment, a method of manufacturing the microelectronic packages includes forming an attachment area and a non-attachment area on a lead finger of a lead frame. The attachment area is more wettable to the solder ball than the non-attachment area during reflow. The method also includes contacting a solder ball carried by a semiconductor die with the attachment area of the lead finger, reflowing the solder ball while the solder ball is in contact with the attachment area of the lead finger, and controllably collapsing the solder ball to establish an electrical connection between the semiconductor die and the lead finger of the lead frame.

The invention discloses an LED (light-emitting diode) chip cutting cutter with a novel structure and an LED chip cutting method, which belong to the field of semiconductor device processing. The LED chip cutting cutter comprises a flange plate and a blade, wherein the flange plate is shaped like a disk, the center of the flange plate is provided with a flange bulge, the edge is provided with a flange transition, and the center of the flange bulge is provided with a mounting hole; the blade is shaped like a ring, and is fixed at the outer edge of the flange transition. The LED chip cutting cutter is highly stable under the condition of high-speed rotation, and is convenient to mount and dismount. By taking the cutting cutter as a cutting tool, the cutting method can be adopted to directly cut out chips with a trapeziform structure, cutting time is shortened, cutting efficiency is increased, and the cut chips are not damaged, and are high in luminous efficiency.

The invention discloses a wafer flattening method. A wafer is a large-size graphics chip and comprises a wafer of a micro-electro-mechanical system (MEMS), and the thickness of the surface of the wafer is within 4 um to 10 um after filling oxides through chemical vapor deposition. The wafer flattening method comprises the following steps of step (1) rough polishing of the surface of the wafer: removing 75%-85% of oxides on the surface of the wafer through rough polishing; step (2) fine polishing of the surface of the wafer: utilizing a fixed abrasive polishing pad and polishing solution without abrasive to carry out fine polishing on the surface of the wafer which is subjected to rough polishing in the step (1) and removing residual oxides on the surface of the wafer; and step (3) wafer post-processing: utilizing deionized water to polish the surface of the wafer under the condition of low pressure, cleaning the residual polishing solution on the surface of the wafer and adjusting the surface of the wafer to hydrophobicity. The second step of the method is helpful for reducing the removal effect of the abrasive on the lower region while increasing the removal effect on the higher region, so that the collapse of the surface of the wafer is controlled.

A coiler apparatus for forming flat coils of textile strands from an upstream stand supply and depositing the coils on a moving conveyor belt for transport downstream to a strand processing station. The coiler apparatus includes a driven rotating arm for forming successive vertical coils of a textile strand received by the rotating arm from the upstream strand supply, a coil support for receiving and supporting each vertical coil as it is formed by the rotating arm, a coil doffer positioned proximate a lower extent of the coil support for progressively doffing a lower portion of successive ones of the coils from the coil support in advance of an upper portion of the coils, and a coil guide extending downstream from the coil doffer for guiding the upper portion of the coils off of the coil support as the lower portion of the coils is doffed by the coil doffer, and for permitting a controlled transition of the coils from their vertical orientation into an array of overlapping, stretched-out coils on the moving conveyor belt.

The invention provides a preparation method for mesoporous multi-element metal oxide. The multi-element metal oxide has a representative formula of AxByOz, wherein A and B are metal elements. The preparation method comprises the following specific steps: (1) dissolving a precursor containing the element A in a solution C, dissolving a precursor containing the element B in a solution D, and mixing the two solutions to obtain a mixed solution E; (2) adding a chelating agent or a surfactant into the mixed solution E, and stirring to obtain a solution F; (3) evaporating the solution F to dryness at a certain temperature to obtain a solid mixture; (4) roasting the solid mixture at 300-1,400 DEG C for 1-20 hours; (5) washing a roasted sample to extract the target product-mesoporous multi-element metal oxide AxByOz. According to the preparation method, the pore collapse caused by over-crystallization of the pore wall of the mesoporous multi-element metal oxide in the roasting process can be prevented; the mesoporous multi-element metal oxide synthesized by the method is high in photocatalytic activity.

The invention belongs to the technical field of civil engineering and relates to a grouting method used for vibration isolating and denoising outside subway tunnel segments. On the basis of vibration isolating and denoising materials, the grouting method incudes construction processes of selecting grouting holes, burying grouting pipes, determining proportion of vibration isolating and denoising resin and catalyst, injecting the proportioned resin and the catalyst into the grouting holes, washing machines and tools, stopping pumping and detaching an injection gun for secondarily grouting every three to five tunnel segments, and an integral isolator is formed to isolate vibration spreading. By the grouting method, the purpose of vibration isolating and denoising is effectively achieved, loose structure of the surrounding rock can be changed in time, integral strength of the rock is improved, construction is safe and reliable, construction speed is accelerated, normal replacement of working surfaces is guaranteed, shield excavation can be applied when passing the fault and the abnormal areas, even in the area with large vibration affection, and the grouting method is worthy of popularization and practical.

The invention discloses a construction method for an anti-sliding cast-in-place pile. According to the technical scheme, the construction method is characterized in that means of timely pumping water and quickening warehousing during pouring, and technical means of quickening initial setting of concrete are adopted at a place where a slope body with a slope surface close to the river has relatively great water seepage, possibly collapses and sinks, and causes great difficulty to pouring construction. The construction method has the advantages that a submersible pump is adopted for draining off water when a water yield in an excavation process is relatively small, in-hole two-fluid water-stop slip casting is firstly carried out before every-time excavation construction when the water yield is relatively great, wherein every-time excavation depth is 1m, two-fluid slip casting holes are arranged along the periphery of a pile hole according to hole depth of 1.5m and spacing of 0.5m, so that the wall body collapse can be effectively controlled; and in a concrete pouring process, a C30 slump constant is as small as possible, and a necessary accelerating agent is added, so that pile body stabilization can be quickened.

The invention discloses a roadway U-shaped steel sleeving shed supporting structure. The supporting method that anchor cables and a metal net are arranged, mortar spraying is conducted, a U-shaped steel sleeving shed is arranged, and grouting is conducted is adopted; firstly, an anchor net spraying layer is formed, the anchor net spraying layer has the effect of preventing surrounding rock from further weathering and deliquescing, the loads on the two sides and a roof of a roadway evenly act on supports so as to avoid stress concentration, thus, rapid press-deformation and roof caving which are caused by crushing of the surrounding rock at the initial excavation period of the roadway can be controlled effectively, and finally an anchor net spraying combination isolation arch on the surfaceof the roadway is formed; secondly, a supporting rigid layer is formed between every two layers of U-shaped steel; the roadway U-shaped steel sleeving shed supporting structure can be resistant to compression with high strength and can conduct yielding moderately, and a hardness and softness double-layer supporting structure is formed; and the stability and supporting strength of the surroundingrock of the crushed soft rock roadway are promoted greatly, a certain guarantee is provided for safe production of a coal mine, meanwhile, a certain amount of roadway maintenance cost is also reducedfor an enterprise, great benefits are achieved for development of the coal enterprise, and thus the roadway U-shaped steel sleeving shed supporting structure can be used and popularized on a large scale.

The invention provides a method for preparing foamed concrete by using coal gangue. The method comprises the following steps: I, crushing the coal gangue by adopting a jaw crusher, and then carrying out ball milling on the crushed coal gangue in a ball mill to obtain coal gangue powder; II, activating the coal gangue powder in a muffle furnace; III, mixing and stirring bean powder and deionized water to obtain a foaming agent; and IV, uniformly mixing the coal gangue powder, cement, sand, broken stone and a water reducing agent to obtain a mixture, then uniformly mixing the mixture and water to obtain slurry, adding the foaming agent into the slurry, uniformly mixing, pouring and forming, demolding and maintaining to obtain the foamed concrete. The coal gangue is adopted as a raw material, the coal gangue is activated and then is mixed with the foaming agent to prepare the foamed concrete, and a product has the characteristics of light weight and good sound insulation and heat insulation effect. The coal gangue is used for preparing the foamed concrete, so that not only is the additional value of the coal gangue sufficiently realized, but also the environmental pollution caused by the coal gangue can be reduced.

The invention discloses a broken surrounding rock and soft rock roadway U-shaped steel sleeve shed support method. The support method adopting anchor cables, a metal net, slurry spraying, a U-shaped steel sleeve shed and grouting is adopted. Firstly, an anchor net spraying layer is formed and used for preventing surrounding rock from further weathering and deliquescence, and thus loads on the twosides and the roof of a roadway are evenly acted on a support so as to avoid stress concentration so that rapid weighting deformation of surrounding rock breaking and roof collapse at the initial stage of roadway excavation can be effectively controlled, and an anchor net spraying combination isolation arch on the surface of the roadway is formed finally; and secondly, a support rigid layer is formed between two layers of U-shaped steel, through the structure, high-strength pressure resistance and moderate yielding can be achieved, a rigid and flexible double-layer support structure is formed,the stability and support strength of broken soft rock roadway surrounding rock are greatly improved, a certain guarantee is provided for safe production of a coal mine, meanwhile, a certain amount of roadway maintenance cost is also reduced for enterprises, great benefits are achieved for the development of the coal enterprises, and large-range using and popularization can be conducted.

The invention relates to the field of green brick manufacturing and provides a green brick overturning machine achieving accurate overturning of green bricks. The green brick overturning machine achieving accurate overturning of the green bricks comprises a basic frame, a main frame, main cylinders arranged between a transmission device basic frame and the main frame, a plurality of cross beams arranged below the main frame and capable of sliding along the main frame, and telescopic cylinders arranged between the multiple cross beams and capable of moving the cross beams; each cross beam is provided with a main clamping plate and auxiliary clamping plates; each transmission device comprises a rotating shaft arranged on the cross beams; the positions, corresponding to the auxiliary clamping plates or the main clamping plates, on the rotating shafts are fixedly provided with cranks a or cranks b; the cranks a or the cranks b are movably connected with the corresponding auxiliary clamping plates or the corresponding main clamping plates; and clamping cylinders and overturning cylinders are both magnetic cylinders without piston rods. When the green brick overturning machine achieving accurate overturning of the green bricks is used for overturning the green bricks, synchronous overturning is achieved, the clamping cylinders and the overturning cylinders are both the magnetic cylinders without the piston rods, the accuracy degree can be improved when the green bricks are overturned and clamped, damage to the green bricks is reduced, the green bricks can also be evenly separated, and work procedures are saved for a setting machine.

The invention relates to the technical field of mining of metal and non-metal ores, in particular to a flat bottom structure sublevel rock drilling stage ore removal subsequent cut-and-filling stopingmethod. The method is suitable for stoping sharply inclined and inclined ore bodies. According to the method, the mining method is suitable for mining thick ore bodies, extremely thick ore bodies, and the sharply inclined and inclined metal and non-metal ore bodies, wherein the sharply inclined and inclined metal and non-metal ore bodies are characterized in that the friction forces of the contact surfaces between the footwall boundaries of the ore bodies and bottom plate surrounding rocks are small, the ore fluidity is good, and the movement angles of ore footwalls are 30 degrees or above; sublevel open stope mining and mined-out area subsequently-filling are achieved, the mining high efficiency of a caving method is achieved, and the safety of a filling method is achieved; and the mining environment is safe, the mined-out area is treated through utilizing the filling method, the ore recovery rate is improved, and the ore dilution rate is reduced.

A suction robot and a steering control method thereof. The suction robot comprises a machine body (4) and a rotary mechanism (1). A suction cup (2) for suction on a working surface is provided at the bottom of the machine body (4). The suction cup (2) is connected to the machine body (4) by using the rotary mechanism (1). The machine body (4) drives the rotary mechanism (1) to enable the machine body (4) to rotate by a preset angle relative to the suction cup (2), so as to complete steering of the robot. A suction robot with a rotary mechanism (1) and a suction cup (2) can precisely control an angle of rotation, prevent a phenomenon of a slip from occurring during rotation, and reduce a possibility of damaging a surface of suction.

The invention discloses a mist spray anti-drifting device for an agricultural unmanned aerial vehicle and a method for applying the mist spray anti-drifting device.The mist spray anti-drifting device comprises a control end, three driving devices and a support rod assembly.The control end comprises a transmitter and a receiver, the driving devices comprise power devices, transmission gears and bases, the support rod assembly comprises a main support rod, a left support rod and a right support rod, and the three driving devices are respectively arranged between the main support rod and an unmanned aerial vehicle body, between the main support rod and the left support rod and between the main support rod and the right support rod and can drive the support rod assembly to be folded and unfolded under the control of the control end; pesticide delivery hoses are arranged in the various support rods of the support rod assembly, and mist spray nozzles are arranged at corresponding positions of the left support rod and the right support rod.The mist spray anti-drifting device and the method have the advantages that the designed support rods are of unfolding and folding structures, can be folded when operation is not carried out and can be unfolded when spray and application operation is carried out; the nozzles are lowered, so that sprayed and applied fog drop can be kept away from influence of wind fields, accurate aviation spray and application operation can be carried out, and the mist spray anti-drifting device is simple in structure and easy and convenient to operate and is small and safe.

The invention discloses an adjusting and controlling type heat collecting ventilating window with fanlights capable of being opened. The ventilating window is characterized by being composed of ventilating openings, an electric shutter, a window frame, a high-reflection coating, external single glass, internal two-layer glass, a high-absorption coating, the fanlights capable of being opened, a controller and ventilating valves. The ventilating openings are formed in the upper portion, the lower portion, the inner portion and the outer portion of the window frame, so that indoor and outdoor ventilation of transition seasons is achieved. The electric shutter can be vertically folded or unfolded and can rotate in an unfolded state, orientations of high-reflection layers and high-absorption layers of shutter vanes are switched, and therefore the functions of lighting, sunshading and heat collecting are switched. The fanlights capable of being opened are located on the upper portion and thelower portion of the indoor side, the fanlights are opened in a flat opening or push-and-pull mode, air heated after heat collecting of the shutter is guided indoors, and internal circulation heat collecting is formed. The controller is arranged on the indoor side of the window frame, the controller can control the ventilating valves to switch off or on circulation of the ventilating openings andindoor and outdoor space, and it can also be controlled that the electric shutter is folded and unfolded, and the shutter vanes rotate when the electric shutter is in the unfolded state.

The invention discloses a mist spray anti-drifting device for an agricultural unmanned aerial vehicle and a method for applying the mist spray anti-drifting device.The mist spray anti-drifting device comprises a control end, three driving devices and a support rod assembly.The control end comprises a transmitter and a receiver, the driving devices comprise power devices, transmission gears and bases, the support rod assembly comprises a main support rod, a left support rod and a right support rod, and the three driving devices are respectively arranged between the main support rod and an unmanned aerial vehicle body, between the main support rod and the left support rod and between the main support rod and the right support rod and can drive the support rod assembly to be folded and unfolded under the control of the control end; pesticide delivery hoses are arranged in the various support rods of the support rod assembly, and mist spray nozzles are arranged at corresponding positions of the left support rod and the right support rod.The mist spray anti-drifting device and the method have the advantages that the designed support rods are of unfolding and folding structures, can be folded when operation is not carried out and can be unfolded when spray and application operation is carried out; the nozzles are lowered, so that sprayed and applied fog drop can be kept away from influence of wind fields, accurate aviation spray and application operation can be carried out, and the mist spray anti-drifting device is simple in structure and easy and convenient to operate and is small and safe.

The invention relates to a solar street lamp bracket with a rain shed based on worm wheel and worm transmission. The solar street lamp bracket is composed of a main supporting rod, a solar power generation device and a sun-shading and rain shielding device, wherein the solar power generation device and the sun and rain shading device are fixed to the main supporting rod. According to the solar street lamp bracket, a controller is utilized to control a stepper motor to drive a worm to conduct transmission, the worm drives a worm wheel to move, the output end of the worm wheel is connected witha daylighting bracket rod, the daylighting bracket rod drives a daylighting bracket and a solar cell panel to move, thus the solar cell panel can roughly move along with the motion trajectory of the sun, and accordingly the power generation capacity of the solar cell panel is increased; meanwhile, a rainwater sensor is used for receiving a rainwater signal, the rain shed in an umbrella shape is arranged on the main supporting rod, the rainwater signal is fed back to the controller, the controller controls the motor to drive a folding rod to be unfolded or folded, and thus the rain shed is unfolded on a rainy day and folded on a sunny day; and the life of people is facilitated greatly.

The invention provides a goaf longitude and latitude filling method, and relates to the technical field of underground filling mining. The method comprises the steps that after a first cut is started,a trend filling body is arranged behind the working face after the working face is pushed, a tendency filling body is constructed before the distance pushed by the working face reaches periodic weighing length, then the working face is continuously pushed, the trend filling body is continuously constructed, the tendency filling body is circularly arranged until the working face is pushed to a stop mining line, and construction of a longitude and latitude filling body is completed. The method can be implemented by means of a goaf longitude and latitude filling system, wherein the filling system comprises a gangue pasty fluid conveying pipe, a stirrer, a filling pump, a hydraulic support, a trend filling pipe, a tendency filling pipe, a wood pile, a trend baffle and a tendency baffle, and the filling pump is connected with the trend filling pipe and the tendency filling pipe through the gangue pasty fluid conveying pipe. The method is simple and convenient to operate, the construction cost of the filling body is low, a roof of goaf is not collapsed, then the surface subsidence is effectively controlled, aquifer can be further protected, and the recovery rate of coal resources is improved.

The invention belongs to the technical field of solar panels and particularly relates to a weather condition-based solar panel control system. The system comprises an information acquisition unit, a solar panel, a processing unit and a mobile terminal, wherein the information acquisition unit comprises a wind power acquisition module and an illumination acquisition module, the processing unit comprises an information analysis module, a transmission module, a processing module, a storage module, a height adjustment module, a folding and unfolding module and a direction adjustment module, and the information acquisition unit is connected with the processing unit, so that the unfolding and folding states of the solar panel can be controlled according to the weather information, and the solar panel can be protected to a certain extent; when the illumination acquisition module is not illuminated for one hour, the solar panel is controlled to be folded, the system power consumption is reduced, the system is environment-friendly and energy-saving, the direction of the solar panel can be adjusted according to the track of sunrise and sunset, sunlight is effectively absorbed, more electric energy is generated, and the utilization rate is high.

The invention provides a detection method of the sandbox sealing performance. A sandbox is sealed, then compressed air is fed into the sandbox so as to enable the sandbox to be in a positive pressure state, and then whether the sandbox leaks air is judged; and if yes, the sandbox is repaired and then detected again, and if not, the sandbox is determined to be qualified. According to the scheme, the sealing performance of the sandbox is dually ensured by a standard inspection flow and a standard inspection method, the vacuum degree of casting is further ensured, box crushing, winkling and air holes caused for insufficient sealing performance of the vacuum sandbox are effectively controlled, the detection method is reusable, the operation is flexible and simple, the cost is low, and the method is suitable for wide popularization.

The invention discloses a construction method capable of causing a pilot hole to pass through a large-area drifting sand layer through a shaft counter-drilling method. The construction method comprises the following steps of: a: making a construction preparation; b: installing a raise boring machine; and c: carrying out pilot hole drilling construction. In a pilot hole drilling construction process, adopted materials are conventional, and price is low, meanwhile, additionally purchased instruments are not required, little special equipment is adopted, in addition, an integral operation methodis convenient and flexible, construction expenses and machinery equipment input are reduced, engineering construction cost is greatly lowered, and construction safety is guaranteed while an economic benefit is good. An influence on the masses in a surrounding area is reduced through a convenient operation, and surrounding environment and underground water are protected since the adopted materialsare free from environmental hazard substances. The technology has high work efficiency, is high in operability, is safe and environmentally, has good quality, is easy in promotion, saves investments,increases a new option for a disposal method capable of causing the pilot hole to pass through the drifting sand layer, prompts a development of a counter-drilling expanding excavation technology, andhas a great potential social benefit.

The invention belongs to teaching apparatus, and particularly provides a globe which comprises a globe body, a rotating shaft, a support and a base seat. The globe body is connected with the support through the rotating shaft in a movable mode, wherein the support is connected with the base seat through magnetism. An integrated circuit is arranged in the globe body, and light-emitting diode (LED) lamps are installed on the integrated circuit. The support is provided with a contracting bag. The LED lamps comprise lamps in seven colors which are respectively red, orange, yellow, green, cyan, blue and purple. The LED lamps in the seven colors are corresponding to seven continent areas on the surface of the globe body. A control button is installed on the base seat and can control stretching and drawing of the contracting bag. When the globe is not used, a user can press the control button on the base seat so that the contracting bag on the support is stretched, and the globe can be packed by the contracting bag and protected well, and friction and damage of the globe are prevented. In addition, the globe has the advantages of being simple in structure, convenient to operate and use, low in manufacturing cost and suitable for popularization and usage in relevant teaching fields.

The invention discloses equipment for achieving regional sintering. The equipment comprises a regional sintering furnace and a mechanical transmission device for achieving downward movement of blanks. The regional sintering furnace comprises a furnace shell, a furnace opening which is formed in the furnace shell and serves as a feeding opening, a thermal insulation material arranged on the side wall and the top wall of the furnace shell, a furnace pipe which communicates with the furnace opening and is surrounded by the thermal insulation material, heating elements arranged on the outer side wall of the furnace pipe, a water cooling device for cooling the furnace pipe and a temperature control system for controlling the temperature of the furnace pipe. The mechanical transmission device comprises an ejector rod arranged in the furnace pipe 7, rolling wheels mechanically connected with the ejector rod, a rolling wheel bearing seat mechanically connected with the ejector rod, a motor for providing kinetic energy for the rolling wheels and the rolling wheel bearing seat, a speed governor for controlling the motor, a chain for transmitting the kinetic energy output by the motor to the rolling wheels and the rolling wheel bearing seat and a reducer for decelerating the chain.

The invention provides a pneumatic needleless injector, and belongs to the technical field of medical apparatus and instruments. The pneumatic needleless injector includes: a housing; a hammer, a first spring, and a limiting table are arranged in the housing; the hammer divides an inner cavity of the housing into a pressurization cavity and a returning cavity; the pressurization cavity communicates with a pressurization air channel; the returning cavity communicates with a returning air channel; a second spring, an exhaust channel and a first slide block are arranged in an inner cavity of the limiting table; an injection switch is arranged on a side wall of the housing; a second slide block is arranged in the returning cavity; a medicine rod connection member is arranged in a front end of the housing; and the medicine rod connection member passes through a medicine control rotary knob and is in matching connection with an ampoule bottle. The pneumatic needleless injector is novel in structure, is reasonable in design, adopts a pneumatic pressurization principle to maintain the pressure value in a suitable range capable of maintaining an injection pressure, is safe to use, can achieve noninvasive injection, can eliminate pain, can significantly reduce damage, and can facilitate operation and use of general noninvasive medical workers.