154 results about "Sawdust" patented technology

The invention discloses a ground directional drilling goaf passing leaking stoppage method which comprises the steps that hole data of a goaf are obtained, and the hole data comprise the hole depth and the crack width; when the width of the crack is larger than 5 mm, a foundation plugging material is adopted for conducting foundation plugging on the hole of the goaf, and the foundation plugging material is an inert material and cement paste; judging whether basic plugging fails or not to obtain a first judgment result; if the first judgment result shows that the basic plugging fails, a flexible plugging material is adopted for conducting medium-term plugging on the holes in the goaf, and the flexible plugging material is a material formed by mixing hemp fiber, sawdust, soybeans and water. According to foundation plugging, a large channel is filled through particle bridging, a primary plugging layer is formed after cement paste is solidified, the flexible material can adapt to trace deformation of surrounding rock through deformation filling, and micro cracks of a foundation layer are plugged. Through graded gradient filling, the leaking stoppage effect can be greatly improved.

A chainsaw is provided, enabling to remove sawdust conveyed inside a main body efficiently, which has a main body including: a guide bar; a saw chain wound around the guide bar and the drive sprocket; a drive sprocket disposed behind the guide bar, having a rotation shaft in a right / left direction of the main body and rotated to move the saw chain along the guide bar; and a guide wall including an arcuate first wall along the drive sprocket with a predetermined gap from the saw chain and a second wall extended rearward via a connecting portion to the first wall, and when seen from the right / left direction, a angle between: a first direction along a vertical direction of the main body; and a second direction passing through the center of the rotation shaft and an apex of the connecting portion is between 0° and 30°.

The utility model relates to the technical field of timber processing, in particular to a dust removal device for timber processing, which comprises a feeding table mounted on a drilling machine, a drilling mechanism for drilling timber is arranged on the drilling machine, and a dust removal mechanism for removing drilling dust is arranged on the drilling mechanism. Sawdust and dust in the drilling process are burst out through the dustproof cover covering the drill bit, threat to the body health of workers and pollution to the working environment caused by the flying of the sawdust and the dust are avoided, the dust in the dustproof cover is sucked out through the dust suction hose by starting the dust collector and guided into the dust collection box, and the dust collection effect is achieved. When the dust cover makes contact with the surface of wood, the drill bit moves downwards to drill holes, the position of the dust cover is not changed, at the moment, the connecting rod connected with the dust cover pushes the pointer to move upwards along the guide sliding groove, and the drilling depth of the drill bit can be known by observing the upward moving height of the pointer.

The utility model relates to the technical field of smoking furnaces, in particular to a smoking furnace which comprises a furnace body and a smoking box, a grill is arranged in the furnace body, the smoking box is arranged in the furnace body, a box cover is arranged on the upper portion of the smoking box, a plurality of smoking holes are formed in the box cover, the box cover is detachably connected with the smoking box, an inserting groove is formed in the side wall of the furnace body and corresponds to the smoking box, and the inserting groove is connected with the smoking box. The smoking box is detachably connected to the inserting groove, the smoking box extends into the inserting groove and then is located on the lower side of the grill, a heating plate is arranged on the lower side of the smoking box, and an electric heating pipe is embedded in the heating plate. The amount of wood chips stored in the smoking box just meets one-time smoking, the wood chips can be added into the smoking box more conveniently, only the smoking box needs to be taken out, the oven door does not need to be opened, the side door does not need to be opened, the influence on the temperature is small, and the wood chips can be conveniently cleaned by a user through the detachable connection mode of the smoking box and the oven body; the smoking holes in the box cover can effectively control the release amount of smoke in the smoking process, and it is ensured that the smoking effect is uniform.

The utility model relates to the technical field of carbonized wood processing, in particular to a carbonized wood polishing and dust removing device which comprises supporting legs, a frame is fixedly connected to the tops of the supporting legs, a conveying belt is rotatably connected to the interior of the frame, anti-skid lines are formed in the surface of the conveying belt, and a supporting frame is fixedly connected to the middle of the outer side of each supporting leg. A driving frame is fixedly connected to the top of the supporting frame, a dust suction box is fixedly connected to the top of the driving frame, the interior of the driving frame communicates with the interior of the dust suction box, the conveying belt penetrates through the interior of the driving frame, a collecting box is fixedly connected to the top end of the inner side of the dust suction box, and a rail is fixedly connected to the bottom end of the inner side of the dust suction box. Compared with an existing carbonized wood grinding and dust removing device, the carbonized wood grinding and dust removing device has the advantages that through the design of the adsorption head and the collecting box, ground carbonized wood sawdust can be rapidly collected, and the overall practicability is greatly improved.

This invention discloses a formula and preparation process for high-calorific-value leaf and walnut shell composite bio-granules. The formula consists of 40% solid wood sawdust, 45% walnut shells, 10% highland barley straw, and 5% leaves. The preparation process includes: slicing, drying, coarsely crushing, and sieving the solid wood sawdust, highland barley straw, and leaves; separately crushing the walnut shells and mixing them with the above-mentioned impurity-removed raw materials, followed by fine crushing; finally, pelletizing the mixture into granules with a length of 5 cm and a diameter of 1 cm using a pelletizer. The granules have a lower heating value of 20.8 MJ / kg (approximately 5000 kcal / kg), a basic ash content of 1.93%, a basic sulfur content of 0.05%, and a dry ash-free volatile matter content of 78.15%. This invention realizes the resource utilization of agricultural and forestry waste, producing a high-calorific-value, low-pollution product. The preparation process is simple and controllable, and it can replace fossil fuels, making it suitable for industrial and civilian applications with significant economic and environmental benefits.

The utility model provides a dust collection woodworking bench saw which comprises a machine shell, a motor, a saw blade and a dust collection cover, installation parts are arranged at the two ends of the machine shell, one side of the machine shell is detachably connected with the dust collection cover, the motor is fixed to the other side of the machine shell, the dust collection cover and the machine shell are combined to form a dust collection bin, hooks are arranged on the two sides of the outer portion of the dust collection bin, and a connecting hole is further formed in the machine shell. A motor shaft of the motor is arranged in the dust collecting bin through the connecting hole, the saw blade is installed in the dust collecting bin and connected with the motor shaft of the motor, and the whole machine is light in weight, small in size, convenient to carry and transfer and diversified in application scene. Sawdust falls into the dust collection bag, and the dust collection effect is good; due to the direct-drive design, the production and maintenance cost is reduced; the dust collection cover is detachable, so that the saw blade is convenient to disassemble and replace; the motor needs to be started through a key switch, misoperation can be prevented, and safety is guaranteed; the contactor can rapidly cut off the power supply when the circuit is abnormal, and the soft starter can smoothly accelerate in the motor to protect the equipment and personal safety.

The utility model discloses a plywood cutting device which comprises a cutting table, the upper surface of the cutting table is fixedly connected with a fixing frame, a dust collector is installed on the upper surface of the fixing frame, a sliding dustproof cover is arranged in the fixing frame, and the outer surface of the sliding dustproof cover is fixedly communicated with a first dust collection pipe. Symmetrical adjusting plates are fixedly connected to the outer surface of the sliding dustproof cover, two springs are fixedly connected to the upper surface of each adjusting plate, and the top end of each spring is connected with the inner wall of the fixing frame. According to the plywood cutting device, a cutting mechanism driven by a motor is adopted, a positioning plate and an adjusting mechanism are combined, accurate positioning and stable cutting of plywood can be achieved, and the accuracy of the cutting size is ensured; and wood chips and dust generated in the cutting process can be effectively collected, dust diffusion is reduced, and the machining environment is improved.

The embodiment of the invention provides a submerged super-amphiphobic oil-water separation material and a preparation method thereof, and belongs to the technical field of oil-water separation materials. The submerged super-amphiphobic oil-water separation material comprises wood chips, a CuO seed layer coated on the surface of the wood chips, and CuS nanocrystals coated on the surface of the CuO seed layer. The under-liquid super-amphiphobic oil-water separation material has excellent underwater oleophobicity and under-oil hydrophobicity, can be used for continuous separation of oil-water mixtures in different scenes, and also has the advantages of low cost, simple process, easiness in degradation, reproducibility and recyclability; the problems that an existing oil-water separation material is complex in preparation process, high in cost, unstable in performance, not prone to degradation, difficult in waste treatment and the like are effectively solved.

The invention discloses alkali-activated all-solid waste concrete using saturated activated carbon and a preparation method of the alkali-activated all-solid waste concrete. The material is prepared from the following raw materials: a solid waste precursor, coal gangue aggregate, CO2 saturated activated carbon and an alkali activator solution. The solid waste precursor is formed by compounding a high-calcium precursor, a low-calcium precursor and coal gangue precursor powder, the coal gangue powder is prepared by crushing, grinding and calcining coal gangue, and the particle size of the coal gangue powder is smaller than 0.075 mm; the coal gangue aggregate is prepared by crushing and calcining coal gangue, and comprises coarse aggregate with the particle size of 1.2-4.75 mm and fine aggregate with the particle size of 0.16-1.2 mm; the raw materials of the activated carbon are biomass materials (such as coconut shells, wood chips and straws), and the CO2 adsorption capacity (25 DEG C, 1bar) is larger than or equal to 2.0 mmol / g. The preparation process comprises the following steps of activated carbon saturation adsorption, dry mixing, wet mixing, forming and curing. The CCUS function of the all-solid-waste-based concrete is realized by using the CO2 saturated activated carbon, and a new path is provided for carbon emission reduction in the building material industry.

The invention discloses an intelligent irrigation and self-degradation rod device for desert sand prevention, control and stabilization, and belongs to the technical field of desertification control and ecological restoration engineering. The device is of an integrally formed structure and comprises an overground spiral rod and an underground water storage fermentation tank, the total length is 55 cm, and the diameter is 3 cm. The outer surface of the overground spiral rod is provided with three vortex type spiral sand blocking water flowing grooves used for blocking sand wind and collecting rainwater, and the collected rainwater is guided into the underground water storage fermentation tank through a water guide pipe. The device body is made of degradable composite materials and comprises 40% of agricultural and pastoral straw sawdust, 30% of coal gangue, 20% of organic clay and 10% of biological adhesive. An automatic drainage system based on the siphon principle is arranged in the water storage fermentation tank, and the functions of water collection, water storage and irrigation can be achieved without external power. The device can be completely degraded in a desert environment within 2-3 years, and soil nutrients are released. The device is standardized in structure, suitable for mechanical arrangement and used for desert soil improvement and ecological restoration.

The utility model discloses a kind of up and down layered season adaptive type detachable hamster nest, it includes pedestal shell, upper layer hemispherical shell, upper layer floor, internal stairway, external spiral ramp, side platform, lateral sand pit and top-mounted meal basin.Pedestal shell is cavity structure, lower part is provided with arch-shaped entrance and exit, and sawdust or paper chip can be selectively filled;Upper layer hemispherical shell is connected with pedestal shell, bottom upper layer floor separates internal space into two layers;Internal stairway connects lower layer hideout with upper layer floor;External spiral ramp spirals to side platform along the outer wall of pedestal shell;Lateral sand pit fixed to the side wall of pedestal shell is used for sand bath and excretion;Top-mounted meal basin is arranged at the top of upper layer hemispherical shell.Outer wall of upper layer hemispherical shell is provided with ventilation window, and outer wall step catch strip is used for hamster to climb.The structure realizes warm-keeping, ventilation and multi-functional partition in limited volume, and can be disassembled and washed without tool, and is suitable for mouse cage environment with limited space.

The utility model discloses a waste treatment device for wood processing, and relates to the technical field of wood processing. The top of the shell is fixedly provided with a protective frame; the front side of the shell is provided with a baffle in an inserting manner; the baffle is fixed with the shell through an inserting rod; the shell is internally provided with a first filter plate in a sliding manner, and is internally provided with a vibration assembly for driving the first filter plate to vibrate; the output ends of the two first hydraulic cylinders penetrate through the rear side of the shell and are fixedly provided with the same extrusion plate, in the process of screening and compacting wood chips, the first filter plate does not need to be inclined and can be kept in the horizontal state all the time, and therefore the wood chips on the first filter plate can be screened more sufficiently, and in addition, the output ends of the two first hydraulic cylinders penetrate through the rear side of the shell and are fixedly provided with the same extrusion plate. And the water storage box can be taken out from the shell, dust on the second filter plate can be cleaned, and the situation that too much dust affects use of the whole device is avoided.

The application discloses a pipe end processing machine and relates to the technical field of metal pipe processing. The pipe end processing machine comprises a processing table, a motor fixedly installed on the processing table, a saw blade rotationally connected to the motor, and a removing mechanism. The removing mechanism comprises a supporting plate and an air pump fixedly installed on the processing table. An air conveying cylinder in communication with an air outlet of the supporting plate is fixedly connected to the inside of the supporting plate. An ion generator is installed in the air conveying cylinder. An air outlet is fixedly connected to the inside of the supporting plate. The application utilizes the air pump and the ion generator to blow the airflow containing positive and negative ions to the cutting head of the saw blade, reduces the sawdust attached to the saw blade under the action of static electricity, makes the groove wall more smooth and flat after the metal pipe is cut and grooved, and further, the airflow control unit can control the airflow to be sprayed in the form of pulses, so that the ions are released to the saw blade at a high speed in a short time, the contact opportunity of the ions and the static electricity is increased, and the static electricity elimination efficiency is improved.

The invention discloses a convenient-to-clean bone sawing machine, and belongs to the technical field of bone sawing machines, the convenient-to-clean bone sawing machine comprises a lower main body, a connecting arm, an upper main body and a cover body, a placing plate is fixedly connected above the lower main body, the front side of the upper main body is rotatably and slidably provided with an upper rotating wheel, the front side of the lower main body is rotatably provided with a lower rotating wheel, and the outer sides of the upper rotating wheel and the lower rotating wheel are sleeved with the same saw blade; a penetrating groove allowing a saw blade to pass through is formed in the cover body, an opening groove allowing the saw blade to pass through is formed in the containing plate, a limiting plate is arranged above the containing plate in a sliding mode, a first locking mechanism is arranged on the front side of the containing plate, a tensioning mechanism is arranged in the upper body, and a rotation driving mechanism is arranged in the lower body. By means of the bone sawing machine, the problems that an existing bone sawing machine cannot effectively clean saw dust left on the surface of a saw blade, and then the equipment cutting efficiency, food sanitation and safety and the service life of the saw blade are greatly affected are solved.

The utility model relates to the technical field of electric saws, and discloses an electric saw with a novel structure, which comprises a movable baffle plate, two mounting plates and a scrap baffle plate, the two mounting plates are positioned on the inner side of the movable baffle plate, and the movable baffle plate rotates relative to the mounting plates to adjust the inclination angle. The movable baffle plate is fixed on the mounting plate through the matching of a bolt A and a nut A which penetrate through the movable baffle plate and the mounting plate; the scrap blocking plate is used for blocking saw dust generated when the reciprocating type saw blade works on the front side of the electric saw shell and comprises an upper scrap blocking plate body arranged above the movable baffle in a rotatable and adjustable mode and a lower scrap blocking plate body buckled between the two mounting plates. The angle of the movable baffle can be adjusted, a special discharging notch is formed, operation convenience and flexibility are improved, saw dust and other chippings can be smoothly discharged, the interior of the electric saw is kept clean, the upper chipping blocking plate and the lower chipping blocking plate act together, the saw dust generated during cutting of the saw blade is effectively collected and blocked, and the saw dust is prevented from splashing all around.

The embodiment of the invention provides super-hydrophobic super-oleophylic oil-absorbing wood chips and a preparation method thereof, and belongs to the technical field of oil-water separation materials. The preparation method comprises the following steps: firstly, cleaning the surfaces of wood chips, and activating the surfaces of the wood chips by adopting a vacuum plasma technology; the wood chips subjected to activating treatment are soaked in SiO2 sol, ultrasonic vibration, vacuum filtration and drying treatment are sequentially carried out, and wood chips coated with SiO2 gel layers are prepared; carrying out vacuum plasma treatment again to change the SiO2 gel layer into a SiO2 seed layer; and finally, further depositing a long-chain carboxylic acid modified SiO2 ceramic layer on the SiO2 seed layer through a hydrothermal reaction. The super-hydrophobic super-oleophylic oil-absorbing sawdust prepared by the preparation method has better selective adsorbability and high oil-water separation efficiency, and can be applied to large-scale oil-water separation; the cost is low, the corrosion resistance is good, the degradation is easy, and the environment-friendly effect is realized.

This application discloses a multifunctional fruit tree pruning saw, relating to the technical field of fruit tree pruning tools. It includes: a saw head comprising a protective housing, a working motor mounted on one side of the housing, and an output shaft of the working motor extending into the housing and mounting a saw blade; a handle portion, which is connected to the tail end of the housing; wherein, a hinge seat is also provided at the front end of the housing, and at least two arc-shaped steel bars are rotatably mounted on both sides of the hinge seat, and a collection box is also installed at the bottom of the arc-shaped steel bars for collecting sawdust falling during pruning. This application's rotatable arc-shaped steel bars and collection box can effectively collect sawdust generated during high-altitude pruning, improving the working environment and enhancing work comfort. The arc-shaped steel bars not only serve as a mounting bracket for the collection box but also act as a guide, guiding branches accurately to the saw blade, thereby reducing operational difficulty and improving cutting accuracy and efficiency.

This utility model provides an automatic turning and turning device for sludge composting, relating to the field of sludge composting technology. It includes a turning and turning device frame, with a turning and turning guide frame welded to the top of the frame. The turning and turning guide frame has a hollow structure, with both its top and bottom being arc-shaped. Sludge is cut and folded by a high-speed moving baffle and enters the turning and turning guide frame, impacting and crushing the clumps in the sludge, improving the breaking effect on the compacted layer of the compost pile. This device is suitable for treating hard sludge compost and solves the problems of traditional sludge composting methods, which typically involve manual turning or using a bucket truck to shovel and scatter the sludge before turning. These methods fail to effectively stir or break up the compost pile during turning, making it difficult to break up the compacted layer, resulting in poor aeration. Furthermore, the thorough mixing of sludge with straw, sawdust, and other auxiliary materials requires multiple turnings, leading to low turning efficiency in sludge composting.

The invention discloses magnesium-phosphorus modified biochar as well as a preparation method and application thereof, and belongs to the technical field of biochar preparation. The preparation method comprises the following steps: (1) preparing poplar sawdust charcoal by adopting a high-temperature oxygen-limited thermal cracking method; and (2) carrying out modification on the poplar wood chip biochar through MgCl2 and KH2PO4. Phosphorus substances can effectively reduce the effectiveness of heavy metal pollutants in soil and deposition substances, and mainly comprise two reaction mechanisms, namely a precipitation mechanism and an adsorption mechanism. And the phosphate realizes remediation of the heavy metal lead polluted soil through surface complexation, ion exchange or generation of amorphous substances. Therefore, the magnesium-phosphorus modified biochar can efficiently passivate the heavy metal lead in the soil. Moreover, the preparation method is simple, the cost is low, the removal rate of pollutants is high, the adsorption capacity is large, and secondary pollution to the environment is avoided.

The application discloses a preparation method of high-quality and low-cost wet-process phosphoric acid activated carbon, and the wet-process phosphoric acid used for activating sawdust is preheated, and then the preheated wet-process phosphoric acid is used for preparing the activated carbon from the sawdust. The activated carbon treated by the method has the characteristics of low ash content and high quality. In addition, the method has the characteristics of short time consumption, small acid consumption and low cost, and is suitable for industrial promotion.

This application relates to a bench drill, including a drill body, a spindle, a drill bit, and a worktable. A cover is slidably connected to the spindle, sliding along the axial direction of the spindle. The drill bit is located within the cover. An inner ring frame is fixedly connected to the inner top surface of the cover, with its circumference aligned with the circumference of the cover. The lower surface of the inner ring frame is higher than the lower surface of the cover. Several uprights are fixedly connected to the inner top surface of the cover, with a brush hinged to the lower end of each upright. The upper surface of the brush is flush with the lower surface of the cover. The cover contains an adsorption assembly for adsorbing sawdust and dust, as well as a sealing assembly. This application effectively reduces the adverse effects on post-processing cleaning.

The invention discloses a catechol-manganese dioxide synergistic directional humification pig manure aerobic composting nitrogen conservation method. Sawdust, straws or rice hulls are used as a carbon-rich bulking agent, and a modified carrier which is mildly oxidized and anchored with gamma-MnO2 is preferably selected; catechol is added in the mixing stage, and the active MnO2 is added in a segmented manner in the initial stage of composting; in an initial reaction window from weak acid to neutrality and moderate ventilation, oxidative condensation of catechol and nitrogen-containing organic matters is promoted, and then curing is carried out until a maturation criterion is reached; according to the method, ammonification and dissipation are inhibited from the source, the fixation and humification degree of nitrogen in an organic combination state is improved, peculiar smell is reduced, the stability and uniformity of a finished product are improved, and the method is suitable for resourceful treatment of livestock and poultry manure.

The utility model relates to the technical field of neodymium iron boron production, and discloses flaky material dehydration equipment for neodymium iron boron production, which comprises a dehydration treatment bin, a sawdust dehydration mechanism is arranged on the dehydration treatment bin, and a dust falling mechanism is arranged on the outer wall of the dehydration treatment bin. The sawdust dewatering mechanism comprises a base, a rotating seat, a stepping motor, a connecting seat and a connecting rod. Through the design of the dehydration treatment bin, an operator can add dry saw dust and neodymium magnet flaky materials into an inner cavity of the dehydration treatment bin at the same time, through the design of the stepping motor, the rotating base can be driven to rotate, meanwhile, the stirring fins are driven to rotate, and the saw dust and the neodymium magnet flaky materials are turned around the middle table; according to the method, sawdust is added into the neodymium magnet sheet-shaped material, so that the sawdust fully absorbs moisture on the surface of the neodymium magnet sheet-shaped material, then the neodymium magnet sheet-shaped material is screened, dehydration treatment is completed, the problem that dehydration is conducted in a drying or airing mode, and consumed time is long is solved, and the timeliness of neodymium magnet sheet-shaped material processing is improved.

Commercially available sawdust-based agglomerates / compressions are brittle and often require the use of an adhesive to act as a binder and improve their strength and moisture resistance. The use of these adhesives raises several questions regarding their environmental impact: the polluting manufacturing process, the petrochemical-derived composition, the emission of volatile organic compounds, the end-of-life management of the material, and its recycling. The materials of the invention address all of the aforementioned drawbacks. These 100% bio-based materials are obtained by hot compression of tree leaf powder, either alone or mixed with sawdust, to produce panels, bricks, or any other thermoformed object using, for example, a hydraulic press or a heated extruder.The materials of the invention exhibit a significant improvement in their mechanical properties and also offer an environmentally friendly alternative to products currently on the market. The invention also relates to the process for obtaining and the products obtained from these materials.

The utility model relates to the technical field of wood processing, in particular to a sawdust conveying and filtering system which comprises a first screening device, a conveying belt, a drying device, a conveying device and a second screening device. The first screening device is used for roughing saw dust; the two ends of the conveying belt are connected with the output end of the first screening device and the input end of the conveying device respectively, a drying device is arranged on the conveying belt and located between the first screening device and the conveying device, and the roughly-selected sawdust is dried through the drying device; the output end of the conveying device is connected with the input end of the second screening device, the conveying device can convey saw dust to the second screening device in a spiral conveying mode, and the second screening device can finely select the dried saw dust. The saw dust conveying device can solve the problem that blockage is prone to occurring in the saw dust spiral conveying process.

This invention discloses a biochar pellet for producing green methanol fuel in fluidized beds or fixed beds, and its preparation and utilization methods. First, agricultural and forestry waste is pyrolyzed and ball-milled into biochar powder. Then, sludge is introduced as the main binder, utilizing the organic colloids in the sludge as a natural binder, eliminating the need for additional inorganic or organic binders, thus achieving waste-to-waste treatment and reducing costs. This invention further introduces sawdust as an auxiliary binder and calorific value regulator. As unpyrolyzed primary biomass, sawdust compensates for the decrease in calorific value caused by the addition of sludge. Simultaneously, the thermoplastic melting of lignin in the sawdust at the high temperature of granulation can play an auxiliary binding role. Finally, by granulating biochar powder, sludge, and sawdust in a specific ratio, biochar pellets with high mechanical strength, good reactivity, and suitable calorific value are obtained, with compressive strength meeting the requirements of vigorous tumbling in fluidized beds and accumulation in fixed beds.

The invention discloses a wood chip particle combustion device, which relates to the technical field of particle combustion, and comprises a large hearth, and a high-temperature fuel gas outlet, a primary blower nozzle, a large furnace door, an ash cleaning channel and a wood chip particle inlet which are arranged on the large hearth, a secondary air self-suction adjustable inlet, a fire grate mounted on the primary blower nozzle and a refractory brick small hearth mounted on the fire grate are arranged on an ash cleaning door of the ash cleaning channel; the sawdust particle combustion device further comprises a protection device mounted on the large hearth; the protection device comprises a fixing plate, a fixing rod installed between the fixing plate and the large hearth and a protection plate installed on the fixing rod in a sliding mode, the protection plate is moved and unfolded by a safe distance, it is ensured that the outer wall of the large hearth can conduct normal heat dissipation during operation, and the situation that the protection plate is too close to cause heat accumulation is avoided; and meanwhile, the protection plate can effectively protect the large hearth, and damage to the large hearth caused by accidental collision between external objects and the large hearth is prevented.

The invention relates to a preparation method of cow dung biochar briquette fuel, and belongs to the technical field of livestock and poultry manure treatment and biomass fuel. The cow dung biochar briquette fuel is prepared from the following raw materials in percentage by mass: 60wt%-100wt% of cow dung and 0-40wt% of sawdust. Dry and fresh cow dung collected in a cattle farm is simply pretreated, sawdust is added into the cow dung, the moisture of a mixture is controlled to be smaller than or equal to 6%, then the mixture is mechanically stirred and mixed to be uniform, the mixture is subjected to hot extrusion forming at the temperature of 150-180 DEG C through a spiral extrusion forming machine to form cow dung fuel rods, the cow dung fuel rods are further pyrolyzed, and the cow dung biochar briquette fuel is obtained, and the pyrolysis heat preservation time is only 10-40 min. By regulating and controlling the moisture of the mixture, the structure and size of the spiral propeller and the hot extrusion temperature, the forming rate of the cow dung charcoal can reach 95% or above, the cow dung charcoal after pyrolysis is high in yield, the heating value is increased, the burning resistance is good, no pollution gas is generated in the combustion process, and the cow dung charcoal has wide application prospects in the fields of civil cooking and heating and the like.

The silencing chain saw with the protection structure comprises a protection shell, the inner wall of the protection shell is rotationally connected with a first driving plate and a second driving plate, the surface of the first driving plate is rotationally connected with a first connecting rod, the inner wall of the first connecting rod is rotationally connected with a first saw blade, and the inner wall of the second driving plate is rotationally connected with a second saw blade. And the surface of the second driving plate is rotationally connected with a second connecting rod. By adopting the brushless motor, the brushless motor can output larger torque or rotating speed under the same power input, or reduce energy consumption under the same output, meanwhile, due to the fact that friction between an electric brush and a commutator does not exist, noise generated during operation of the brushless motor is low, operation is more stable, the brushless motor is started, and the service life of the brushless motor is prolonged. The first saw blade and the second saw blade are driven to move back and forth in a reciprocating mode, tree cutting is achieved, tree chips generated when the first saw blade and the second saw blade saw the tree are blocked by the pair of protection buffer sleeves and then fall down, and the tree chips are prevented from adhering to the surface of clothes of an operator.