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32results about How to "Does not add significant weight" patented technology

Flat plate type vacuum pulsation drying machine

The invention belongs to the technical field of agriculture product processing, and particularly relates to a flat plate type vacuum pulsation drying machine. The flat plate type vacuum pulsation drying machine comprises a machine body, a control unit, a material drying unit and a pulsation vacuum unit, wherein the material drying unit is provided with multiple layers of material shelves. According to the flat plate type vacuum pulsation drying machine disclosed by the invention, a heating part adopts special electric heating plates, so that the processing is simple and convenient, the cost is low, the heating temperature is uniform, and the manufacturing cost, the using cost and the maintaining cost of the drying machine are greatly reduced; through a hierarchical control mode, corresponding heating plates can be opened according to actual processing amount, so that the energy consumption is reduced; meanwhile, soft material trays are adopted, so that the contact conditions between the material trays and the heating plates are remarkably improved, the quality of dried products can be effectively ensured, and the problem that the soft material trays are inconvenient to move is overcome by using a dedicated material tray shovel to assemble and disassemble the material trays; in addition, the flat plate type vacuum pulsation drying machine belongs to static drying, the breakage of materials cannot be caused; the processing and loading capacity of equipment can be effectively increased by virtue of a multi-layer structure.
Owner:CHINA AGRI UNIV

Fabricated fibrous concrete combined deck structure and construction method thereof

The invention discloses a fabricated fibrous concrete combined deck structure and a construction method thereof. The combined deck structure comprises a steel bridge deck layer, wherein a fabricated fibrous concrete layer covers the upper surface of the steel bridge deck layer; the main body of the fabricated fibrous concrete layer is a cast-in-situ fibrous concrete layer; a plurality of prefabricated fibrous concrete plates are in embedded connection with the cast-in-situ fibrous concrete layer; tongue-and-groove joints articulated with the cast-in-situ fibrous concrete layer are arranged at the periphery of each prefabricated fibrous concrete plate; and the fabricated fibrous concrete layer is equipped with steel bars. The construction method comprises the following steps: the steel bridge deck layer is manufactured at first, and then the prefabricated fibrous concrete plates are manufactured and laid, or steel bridge deck blocks are prefabricated at first, and steel beams are erected and assembled; after that, the construction of the cast-in-situ fibrous concrete layer and the surface treatment are carried out in sequence; and the construction is completed finally. The combined deck structure disclosed by the invention can improve the tensile strength limit of concrete slabs and effectively prevent a pavement layer from cracks, and has good service durability, good fatigue resistance; and the construction process is simple and efficient.
Owner:HUNAN UNIV

Backlight unit

The invention provides a backlight unit which comprises a back plate (2), a light guide plate (4) arranged in the back plate (2), a back light source (6) arranged on the back plate (2), and a heat dissipating film (220) arranged on the back plate (2). The heat dissipating film (220) is made of grapheme and is 0.01-0.05 thick. The backlight unit is effectively improved in heat dissipating effect through the arrangement of the heat dissipating film made of the grapheme on the back plate, enables heat to be evenly distributed on the whole surface in the plane direction of the heat dissipating film, and removes local heat points. Moreover, grapheme materials are light, so that the further-arranged heat dissipating film made of the grapheme can not obviously increase the weight of the backlight unit.
Owner:TCL CHINA STAR OPTOELECTRONICS TECH CO LTD

Manufacturing method of grating

ActiveCN105082557AImprove featuresAvoiding problems with warped phenotypesGratingUltimate tensile strength
The invention discloses a manufacturing method of grating. The manufacturing method comprises the following steps: laying carbon fiber prepreg in a mould for manufacturing gratings; foaming a meta-material microstructure layer above the carbon fiber prepreg; carrying out mould assembly, filling a resin material into the mould; curing the resin material in the mould, and demoulding. In the provided manufacturing method, fiber carbon and resin material are added into the mould, at the same time, the resin material in the mould is solidified; thus the grating has the characteristics of ideal strength and good moulding property; and moreover, the grating has a better performance when facing electromagnetic waves. Furthermore, the grating density can be controlled in a low range by the provided manufacturing method, the weight of the grating cannot be increased prominently, the portability of grating will not be influenced, and the grating is convenient to process and convey.
Owner:KUANG CHI CUTTING EDGE TECH LTD

Sectional type fan blade and assembling method thereof

The invention discloses a sectional type fan blade and an assembling method thereof. The sectional type fan blade comprises a first blade section, a second blade section and a connecting assembly, wherein after the first blade section is connected with the second blade section through the connecting assembly, the first blade section, the connecting assembly and the second blade section form a whole; the connecting assembly comprises a socket piece, an insertion piece and a fixing assembly, a socket groove is formed in the socket piece, the insertion piece is matched with the socket groove, and the fixing assembly is used for fixing the relative position between the socket piece and the insertion piece; and one of the socket piece and the insertion piece is formed at the end, close to the second blade section, of the first blade section, and the other one of the socket piece and the insertion piece is formed at the end, close to the first blade section, of the second blade section. According to the sectional type fan blade, connection of the sectioned blades can be more reliable, the additional mass of the sectioned positions is light, and factory production and wind field on-site operation are facilitated.
Owner:SHANGHAI ELECTRIC WIND POWER GRP CO LTD

Cold-formed thin-walled steel-structure house outer wall structure system

A cold-formed thin-walled steel-structure house outer wall structure system comprises beams and wall frame pillars, and the beams and the wall frame pillars are in cooperation with one another. The cold-formed thin-walled steel-structure house outer wall structure system is characterized in that the wall frame pillars comprise lower layer pillars (8) and upper layer pillars (18); the beams comprise floor beams (9), a top beam (11) and a bottom beam (17); the tops of the two adjacent lower layer pillars (8) are fixedly embedded in the top beam (11); pulling resistant pieces (13) are connected between the inner walls of the lower layer pillars (8) and the top beam (11), the floor beams (9) are fixed above the top beam (11), and the bottom beam (17) is fixed above the floor beams (9); the bottoms of the two adjacent upper layer pillars (18) are fixedly embedded in the bottom beam (17); pulling resistant pieces (13) are connected between the inner walls of the upper layer pillars (18) and the bottom beam (17); and a truss type strengthening part is installed between the top beam (11) and the bottom beam (17), and the truss type strengthening part is fixed to the top beam (11) and the bottom beam (17) through spacers (16) and nuts (19) after pulling resistant anchor bolts (14) penetrate through bolt holes (15), the top beam (11), steel sleeves (4) and the bottom beam (17).
Owner:SOUTHWEAT UNIV OF SCI & TECH

VR glasses

The invention relates to the technical field of virtual reality and specifically relates to VR glasses. The VR glasses comprise a glasses frame, glasses legs, a face mask, a sucker, a clamping buckle, support legs and spray modules. An adsorption plane and the face mask are arranged on the glasses frame; the sucker is fixedly connected with the clamping buckle; the sucker can be absorbed on the adsorption plane; the clamping buckle can be clamped to the nose bridge connection place of conventional glasses; an elastic rope is arranged between the clamping buckle and the glasses frame, and the elastic rope can prevent the sucker and the clamping buckle from being lost; the sucker and the clamping buckle are used for fixing the conventional glasses and the glasses frame; the support legs are foldably arranged under the glasses frame, and the support legs are used for supporting the glasses frame over the face; and the spray modules are arranged on the glasses frame and are used for spraying eye drops to eyes of a wearer. The VR glasses can prevent the conventional glasses from falling, and weight of the VR glasses is not increased significantly; meanwhile, wearing comfort level of the VR glasses can be improved; and eye drops can be sprayed to the eyes of the wearer, thereby relieving fatigue of the eyes of the wearer and improving watch quality of the wearer.
Owner:王冬冬

Reinforcing structure between longitudinal and transverse walls of cold-formed thin-walled section steel house

The invention discloses a reinforcing structure between longitudinal and transverse walls of a cold-formed thin-walled section steel house. The reinforcing structure comprises beams and wall frame columns, wherein the beams and the wall frame columns are mutually matched. The wall frame columns comprise lower-layer columns and upper-layer columns; the beams comprise floor beams (23), lower-layer house U-shaped beams (7) and upper-layer house U-shaped beams (8); the tops of the lower-layer columns are inlaid in openings of the U-shaped steel top beams (7) and fixed; the bottoms of the upper-layer columns are inlaid in openings of the U-shaped steel bottom beams (8) and fixed; the lower-layer columns and the upper-layer columns are connected through connecting pieces (12); anti-pulling pieces (17) are connected between the lower-layer columns and the U-shaped steel top beams (7), and anti-pulling pieces (17) are connected between the upper-layer columns and the U-shaped steel bottom beams (8); and H-shaped reinforcing components (6) between steel layers are connected between the U-shaped steel top beams (7) and the U-shaped steel bottom beams (8). The reinforcing structure is characterized in that oblique supporting pieces are connected between parts of the upper-layer columns and the U-shaped steel bottom beams (8) and / or oblique supporting pieces are connected between parts ofthe lower-layer columns and the U-shaped steel top beams (7).
Owner:SOUTHWEAT UNIV OF SCI & TECH

Sensor for monitoring temperature/strain signals of bearings

ActiveCN109341777ARealize the ability to output a variety of signalsSimple structureMachine bearings testingThin film sensorMonitoring temperature
The invention relates to a sensor for monitoring temperature / strain signals of bearings. The sensor is formed by preparing a strain sensitive layer (2) and a temperature sensitive layer (3) on an outer-ring end face (1) of a bearing. One end of the strain sensitive layer (2) and one end of the temperature sensitive layer (3) are overlapped with each other. The strain sensitive layer (2), the temperature sensitive layer (3) and the overlap surface of the strain sensitive layer (2) and the temperature sensitive layer (3) are insulated from the outer-ring end face (1) of the bearing. The resistance value of the strain sensitive layer (2) can change with strain so as to form a strain sensor. The voltage value of the overlap surface of the strain sensitive layer (2) and the temperature sensitive layer (3) can change with temperature so as to form a thermocouple temperature sensor. Signals are led out by leads (4) at the other end of the strain sensitive layer (2) and at the other end of thetemperature sensitive layer (3). A thin film sensor of a composite structure is realized, which can simultaneously detect the temperature and strain parameters of bearings.
Owner:CHINA PRECISION ENG INST FOR AIRCRAFT IND AVIC

Flat Vacuum Pulse Dryer

The invention belongs to the technical field of agriculture product processing, and particularly relates to a flat plate type vacuum pulsation drying machine. The flat plate type vacuum pulsation drying machine comprises a machine body, a control unit, a material drying unit and a pulsation vacuum unit, wherein the material drying unit is provided with multiple layers of material shelves. According to the flat plate type vacuum pulsation drying machine disclosed by the invention, a heating part adopts special electric heating plates, so that the processing is simple and convenient, the cost is low, the heating temperature is uniform, and the manufacturing cost, the using cost and the maintaining cost of the drying machine are greatly reduced; through a hierarchical control mode, corresponding heating plates can be opened according to actual processing amount, so that the energy consumption is reduced; meanwhile, soft material trays are adopted, so that the contact conditions between the material trays and the heating plates are remarkably improved, the quality of dried products can be effectively ensured, and the problem that the soft material trays are inconvenient to move is overcome by using a dedicated material tray shovel to assemble and disassemble the material trays; in addition, the flat plate type vacuum pulsation drying machine belongs to static drying, the breakage of materials cannot be caused; the processing and loading capacity of equipment can be effectively increased by virtue of a multi-layer structure.
Owner:CHINA AGRI UNIV

Unmanned aerial vehicle wireless charging system with position capturing function

The invention discloses an unmanned aerial vehicle wireless charging system with a position capturing function, belongs to the technical field of wireless power transmission, and aims to solve the problem that the power transmission efficiency is affected due to the fact that the coupling coefficient between a primary coil and a secondary coil changes along with position deviation between the primary coil and the secondary coil in the existing wireless power transmission. The input end of a full-bridge inverter circuit is connected with an input power supply, the output end of the full-bridgeinverter circuit is connected with a primary side coil of a loose coupling transformer through a primary side compensation topology, a secondary side coil of the loose coupling transformer is connected with a rectifying and filtering circuit through a secondary side compensation topology, and the output end of the rectifying and filtering circuit is connected with an unmanned aerial vehicle charging load; a current sampling circuit is used for collecting input end current of the full-bridge inverter circuit and transmitting the input end current to a DSP controller; and the DSP controller provides a driving signal for the full-bridge inverter circuit and controls the on-off switching of the primary side coil. The unmanned aerial vehicle wireless charging system is used for unmanned aerialvehicle load charging.
Owner:HARBIN INST OF TECH

Stone excavation fragmentation device for fractured rock layer and method for installing and using same

ActiveCN109519120AEfficient, safe and reliable excavationSimple structureVibration drillingControl lineEnergy supply
The invention discloses a stone excavation fragmentation device for a fractured rock layer and a method for installing and using the same. The fragmentation device comprises a fragmentation drilling device, a hydraulic energy supply device and a walking system. The fragmentation drilling device comprises a vertical drilling head, an expander, a positioning oil cylinder, a fragmentation vibrator, avertical adjustment oil cylinder and a fragmentator oil pump. The hydraulic energy supply device includes a fragmentator positioning telescopic arm, a fragmentator telescopic arm supporting frame, afragmentator oil supply system and an oil supply pipe. The walking system includes a generator set, an operation room, a walking track, a walking system supporting frame, a power line and a control line. The stone excavation fragmentation device intends to replace a traditional construction process with an automatic large-scale mechanical device to achieve the purpose of reducing safety risks andimproving production efficiency. By technical comparison analysis and defect analysis of current stone excavation construction links of the fractured rock layer, we find that a conventional drilling and blasting excavation process has the problem that a large amount of fire work materials must be used and the safety guarantee coefficient is low.
Owner:CHINA MCC17 GRP

Anti-theft lock for optical cable junction box

The invention discloses an antitheft lock for cable cross-connecting cabinets and belongs to the technical field of antitheft equipment. The antitheft lock comprises a mechanical lock body mounted on a cabinet door. The mechanical lock body is hinged to one end of an upper lock bar and one end of a lower lock bar; the other end of the upper lock bar and the other end of the lower lock bar are fitted to a lock hole in an upper door frame of a cabinet body and a lock hole in a lower door frame of the cabinet body. The antitheft lock further comprises at least one electronic lock and their control system; the electronic locks are used for adding locking points in case that the cabinet door is damaged by impact; each electronic lock comprises a lock shell mounted on the inner side of the cabinet door; an electromagnet is disposed within each lock shell; the control end of each lock shell is provided with a lead electrically connected with the control system; each lead extends into the corresponding lock shell and connected with the corresponding electronic lock; each lock shell is provided with a lock pin; a body of each lock pin is sleeved with a return spring. The antitheft lock comprising the mechanical lock and the electronic locks has the advantages that the electronic locks provide more lateral locking points, the cable cross-connecting cabinets are better theft preventive, and safety of the cable cross-connecting cabinets is guaranteed.
Owner:STATE GRID CORP OF CHINA +1

Method and system capable of using waste heat for supplying hydrogen to HCNG engine power system

The invention belongs to the field of HCNG engine application, and particularly relates to a method and system capable of using waste heat for efficiently and precisely supplying hydrogen to an HCNG engine power system. The system comprises a medium-high temperature solid metal hydride hydrogen storage reactor, a low-temperature solid metal hydride hydrogen storage reactor, a fuel mixing cavity, and an SI engine. The medium-high temperature solid metal hydride hydrogen storage reactor and the low-temperature solid metal hydride hydrogen storage reactor can achieve efficient releasing of hydrogen through waste heat of the HCNG engine, meanwhile, a dual-hydrogen source can be precisely regulated to provide needed mixed hydrogen for a natural gas internal combustion engine, and stable hydrogen supply and mixed hydrogen combustion are achieved. According to the system, the waste heat of the HCNG engine is used for driving the solid-state dual-hydrogen source system to achieve efficient, precise and stable hydrogen supply, the comprehensive heat efficiency of the natural gas engine can be improved, the pollutant emission amount of the natural gas engine can be effectively reduced, and the clean and efficient use of the natural gas can be achieved.
Owner:XI AN JIAOTONG UNIV

Cold-formed thin-walled steel structure building exterior wall structure system

A cold-formed thin-walled steel-structure house outer wall structure system comprises beams and wall frame pillars, and the beams and the wall frame pillars are in cooperation with one another. The cold-formed thin-walled steel-structure house outer wall structure system is characterized in that the wall frame pillars comprise lower layer pillars (8) and upper layer pillars (18); the beams comprise floor beams (9), a top beam (11) and a bottom beam (17); the tops of the two adjacent lower layer pillars (8) are fixedly embedded in the top beam (11); pulling resistant pieces (13) are connected between the inner walls of the lower layer pillars (8) and the top beam (11), the floor beams (9) are fixed above the top beam (11), and the bottom beam (17) is fixed above the floor beams (9); the bottoms of the two adjacent upper layer pillars (18) are fixedly embedded in the bottom beam (17); pulling resistant pieces (13) are connected between the inner walls of the upper layer pillars (18) and the bottom beam (17); and a truss type strengthening part is installed between the top beam (11) and the bottom beam (17), and the truss type strengthening part is fixed to the top beam (11) and the bottom beam (17) through spacers (16) and nuts (19) after pulling resistant anchor bolts (14) penetrate through bolt holes (15), the top beam (11), steel sleeves (4) and the bottom beam (17).
Owner:SOUTHWEAT UNIV OF SCI & TECH

Wireless optical communication atmospheric turbulence resisting method based on OAM mode hopping

The invention belongs to the field of wireless optical communication, and discloses a wireless optical communication atmospheric turbulence resisting method based on OAM mode hopping. The high-speed optical switch gates a modulated Gaussian beam to different spiral phase plates, the spiral phase plates convert the Gaussian beam into a vortex beam, and in each symbol period, the topological charge of OAM is changed for multiple times, so that the performance can be improved. According to the atmospheric turbulence resisting method, the spatial dimension of light is modulated, the structure is simple, a mode with good turbulence resisting performance can be selected in real time, the mode hopping rate can be dynamically adjusted, the problem that turbulence of different intensities cannot be adapted due to a fixed emission mode is avoided, the method is easily combined with an existing wireless optical communication system, the weight and the size of the system are not obviously increased, and optical power fluctuation caused by atmospheric turbulence can be effectively reduced.
Owner:NAT UNIV OF DEFENSE TECH

Fabricated fibrous concrete combined deck structure and construction method thereof

The invention discloses an assembled fiber concrete composite bridge deck structure and a construction method thereof. The composite bridge deck structure comprises a steel bridge deck layer, an assembled fiber concrete layer is covered above the steel bridge deck layer, and the assembled fiber concrete layer The main body is a cast-in-place fiber concrete layer, in which a number of prefabricated fiber concrete slabs are embedded. Around the prefabricated fiber concrete slabs, there are tongue-and-groove joints occluded in the cast-in-place fiber concrete layer, and steel bars are also provided. The construction method of the present invention comprises the following steps: first make the steel bridge deck layer, then make the prefabricated fiber concrete slab and lay it; or prefabricate the steel bridge deck block and the fiber concrete slab first, and then erect the assembled steel girder; The fiber-reinforced concrete layer is poured, the surface is treated, and the construction is finally completed. The combined deck structure of the invention can increase the ultimate tensile strength of the concrete slab, effectively prevent cracks in the pavement layer, has good durability, good fatigue resistance, and the construction process is simple and efficient.
Owner:HUNAN UNIV

Gas-liquid mass transfer efficient temperature-controllable bioreactor

The invention discloses a gas-liquid mass transfer efficient temperature-controllable bioreactor, and relates to the technical field of bioreactors, in particular to a reaction tank and a discharge port, a connecting plate is arranged on the right side of the upper end of the reaction tank, a detection cavity is slidably mounted in the connecting plate, and a connecting pipe is arranged at the left end in the detection cavity. According to the gas-liquid mass transfer efficient temperature-controllable bioreactor, through the design that the interior of the detection cavity is hollow, colored water with the pH value can be injected into the detection cavity in advance, and therefore when gas leakage occurs in the detection cavity through connection of the joint of the connecting pipe and the external gas connecting pipe, the gas leakage can be avoided; the water generates bubbles and water flow fluctuation due to overflow of gas in the detection cavity, so that the PH test paper horizontally placed in the test paper placement groove can be contacted through the water flow fluctuation, the PH test paper can be in contact with the water to generate color change, and a user can conveniently detect and observe the sealing condition of the joint of the connecting pipe and the external gas connecting pipe.
Owner:智享生物科技(苏州)有限公司

Method and system for using waste heat to supply hydrogen to hcng engine power system

The invention belongs to the field of HCNG engine application, and particularly relates to a method and system capable of using waste heat for efficiently and precisely supplying hydrogen to an HCNG engine power system. The system comprises a medium-high temperature solid metal hydride hydrogen storage reactor, a low-temperature solid metal hydride hydrogen storage reactor, a fuel mixing cavity, and an SI engine. The medium-high temperature solid metal hydride hydrogen storage reactor and the low-temperature solid metal hydride hydrogen storage reactor can achieve efficient releasing of hydrogen through waste heat of the HCNG engine, meanwhile, a dual-hydrogen source can be precisely regulated to provide needed mixed hydrogen for a natural gas internal combustion engine, and stable hydrogen supply and mixed hydrogen combustion are achieved. According to the system, the waste heat of the HCNG engine is used for driving the solid-state dual-hydrogen source system to achieve efficient, precise and stable hydrogen supply, the comprehensive heat efficiency of the natural gas engine can be improved, the pollutant emission amount of the natural gas engine can be effectively reduced, and the clean and efficient use of the natural gas can be achieved.
Owner:XI AN JIAOTONG UNIV

Manufacturing method of non-woven glass fiber cloth

A method for manufacturing non-woven glass fiber cloth, which includes manufacturing steps such as fiber expansion, resin impregnation, fiber smoothing processing, and finished product coiling, and can produce a non-woven glass fiber cloth for application In the production of various fiber composite products, the phenomenon of thread marks on the surface of the fiber composite products can be effectively improved, so that the surface of the surface layer can clearly present a reflection image of an object.
Owner:UNITED SHIP DESIGN & DEVELOPMENT CENTER

Luggage box body structure and manufacturing method thereof

The invention provides a luggage box body structure and a manufacturing method thereof, wherein the luggage box body structure is a stereoscopic box body being made from a woven thermoplastic composite material. The box body includes four side plates, a bottom plate and four arc-angle end parts, wherein a sealed arc-shaped gap is formed at an adjacent connection position of each arc-angle end part and the bottom plate. Any two adjacent connection side plates are each integratedly extended to form a first laminated part and a second laminated part, wherein an integrated connection structure being free of notch is formed between the first laminated part and the second laminated part. The arc-angle end parts of the box body are folded and are attached to the first laminated part and a second laminated part and are arranged on an inner surface of one side surface to form an integratedly connected and laminated angle end structure. By means of the folding method, the plate material, of which the angle ends are not notched, are folded and are processed to form a stereoscopic concave box body structure, thereby achieving the object of increasing the strength of the angle end parts of the box body without increasing of the whole weight of the luggage box.
Owner:裕弘实业(河源)有限公司

Chopping knife

The invention provides a chopping knife. The chopping knife comprises a threaded conical section and a threaded truncated conical section, wherein the threaded conical section is provided with a head part and a tail part; the threaded truncated conical section is provided with a first end part with a smaller diameter and a second end part with a larger diameter, the first end part is connected with the tail part, the diameter of the first end part and the diameter of the tail part are equal, and the taper angle of the threaded truncated conical section is greater than the taper angle of the threaded conical section; the chopping knife additionally comprises a threaded cylindrical section which is connected with the threaded truncated conical section, wherein the diameter of the cylindrical section and the diameter of the second end part are equal. The threaded truncated conical section can expand wood to enable the wood to be easily cracked, the threaded cylindrical section can continuously expand the wood, the size and the weight of a conical head are not obviously increased, the product cost is reduced and the chopping knife is convenient to use.
Owner:POSITEC POWER TOOLS (SUZHOU) CO LTD

Building concrete compressive strength detection device

The invention belongs to the technical field of civil construction engineering, and particularly relates to a building concrete compressive strength detection device which comprises a shell, a machineshell and an adjusting column. A machine shell is arranged in the shell, and the machine shell is of a cylinder structure. An adjusting column is fixedly connected to the position, close to the uppersurface of the machine shell, of the outer arc face of the machine shell, and the adjusting column is rotationally connected with the shell. Effective detection of the concrete surface compressive strength in the inclined state is effectively achieved, meanwhile, the concrete inclination angle specific corresponding numerical value can be effectively and synchronously detected in the detection process, effective conversion of the later compressive strength detection numerical value is facilitated, the situation that special angle detection on the concrete surface cause inconvenience in detection personnel, and the workload of the detection personnel is greatly improved can be avoided, The device has the advantages of simple structure, easiness in operation, no great increase of the weightof the rebound apparatus, convenience in carrying and detection at any time.
Owner:刘玉荣
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