251results about How to "Prevent burst" patented technology

The invention discloses a laser cutting machine with a hard and brittle material explosion-proof function, and relates to the technical field of laser cutting machines. When a hard and brittle material needs to be cut, after the hard and brittle material is placed, a temperature control module is controlled to start to work through an operating console, so that a heat conducting plate is heated by a heating wire and a heating pipe; the situation that the difference between the temperature of a cutting point and the temperature of a peripheral material is too large during laser cutting is avoided, the situation that the hard and brittle material bursts due to the too large temperature difference is prevented, the probability that the hard and brittle material bursts in the laser cutting process can be reduced, and cutting operation is started after material preheating is completed; and meanwhile, an electric telescopic rod drives a connecting rod to move upwards, so that a protective plate forms protection around the workbench, the protective plate is made of a transparent acrylic plate material, the influence on observation of the material cutting process is avoided, and when hard and brittle materials are exploded, the protective plate is used for blocking splashed fragments, and the use safety of the laser cutting machine is improved.

The invention relates to the technical field of fertilizer fermentation, and discloses fruit and vegetable waste microbial fertilizer fermentation equipment which comprises a fermentation tank, a feeding pipe and a discharging pipe are arranged at the top and the bottom of the fermentation tank respectively, switch valves are mounted on the feeding pipe and the discharging pipe, and a turning mechanism for turning a microbial fertilizer is arranged in the fermentation tank. According to the fruit and vegetable waste microbial fertilizer fermentation equipment, through the arrangement of the dispersing assembly, fertilizer guided out upwards by the material guiding barrel can be uniformly dispersed to the upper layer, through the arrangement of the circulating assembly, liquid materials on the bottom layer of the fermentation tank can be upwards and circularly sprayed out, and the turning work of one layer of fertilizer and one layer of liquid materials is achieved; the fertilizer overturning balance is enhanced, so that the follow-up fertilizer fermentation effect is improved, and the problem that in the prior art, fermentation equipment generally can only guide out the fertilizer on the bottom layer of the fermentation tank upwards and cannot guide out liquid materials precipitated below independently, and the fertilizer fermentation balance is affected is solved.

The invention relates to a vacuum chamber for a high-altitude simulation test of a liquid rocket engine, belongs to the technical field of aerospace liquid rocket engine tests, and solves the technical problems of single function, difficulty in operation and poor safety of a traditional vacuum chamber. The cabin comprises a cabin body, a cabin door, a heat sink system, a fire fighting system, a gas replacement system, an anti-arch blasting device, a blowdown system, a mounting platform, an operation platform, a propellant supply pipeline and measurement and control equipment. The cabin body is cubic, and the working pressure in the cabin body is 0-0.1 MPa. The cabin door is used for entering and exiting of personnel, small ground equipment, an engine and a thrust measuring device. The heat sink system, the fire fighting system, the gas replacement system, the sewage discharge system, the mounting platform and the propellant supply pipeline are mounted on the cabin body, and the measurement and control equipment is a transmission channel for engine control and measurement signals. The vacuum chamber is used for a liquid rocket engine high-altitude simulation test.

The utility model relates to the technical field of tempered glass processing, in particular to a synchronous water spraying device for tempered glass trepanning processing. The technical problems that according to an existing trepanning machining device, a special drill bit is usually adopted for completing trepanning operation, due to the fact that tempered glass is high in hardness, a large amount of heat can be generated during drilling, a transmission pipe cannot synchronously spray cooling liquid along with the drill bit in time for cooling and heat dissipation, the drill bit can be possibly overheated, and abrasion of the drill bit is aggravated are solved. The drill bit is deformed or fractured, and the product quality is influenced. According to the technical scheme, the synchronous water spraying device for tempered glass trepanning machining comprises a workbench, a machining assembly, a conveying assembly and a positioning assembly. The spraying pipe synchronously sprays water and cools along with drilling of the drill bit, the surface temperature of drilled glass can be rapidly reduced in time, thermal expansion and thermal stress are reduced, glass burst is prevented, the drilling speed is increased, meanwhile, water flow can keep the surface of the glass in a wet state, and glass fragments are reduced.

The utility model discloses a liquid outlet buffer component, liquid outlet device and beverage machine relates to catering equipment technical field, including elastic pipeline and limit suite, the first end of elastic pipeline is communicated with pumping pipe, and the second end is communicated with the product pipeline, the inner diameter of elastic pipeline is less than the inner diameter of pumping pipe to play the throttling effect, and the limit suite is equipped with the limit suite. Meanwhile, the elastic pipeline is made of an elastic material, so that the elastic pipeline can perform certain deformation buffer offset on the pulse of the liquid, the limiting suite is provided with a limiting channel, the elastic pipeline is arranged in the limiting channel, and a preset distance is formed between the outer wall of the elastic pipeline and the limiting channel; the elastic pipeline is used for accommodating deformation of the elastic pipeline and limiting the limit degree of the deformation, so that the elastic pipeline is prevented from being burst. When liquid enters the elastic pipeline from the pumping pipe, the throttling effect is generated at the elastic pipeline under the influence of the change of the inner diameter of the pipeline, the pulse of the liquid can be neutralized through the deformation of the elastic pipeline, and the smooth flowing of the liquid in the product outlet pipeline is ensured.

The invention discloses an automatic cooling circulation system and method for a high-voltage direct-current circuit breaker, and the system comprises a machine body water jacket nested at the outer side of the circuit breaker, takes away the heat generated by the circuit breaker through the circulating flow of a cooling liquid, provides cooling liquid circulation power through a water pump, and increases the heat dissipation area of the cooling liquid through a heat dissipation net. Heat exchange between cooling liquid and air is conducted, a fan is used for blowing air to a heat dissipation net, heat dissipation is accelerated, meanwhile, electric arcs of a circuit breaker are lengthened through blowing, impedance of the circuit breaker is increased, the system is connected into a diaphragm type expansion tank and a water tank, and the pressure in a cooling circulation system pipeline is adjusted. The system is high in automation operation degree, the fan and the water pump can be prevented from being in a high-power working state under the condition that the temperature is not high, the service life of equipment is prolonged, meanwhile, the system can meet the requirements of different temperature working conditions, and the application range is wide.

The invention provides a method for removing photoresist on a wafer and semiconductor process equipment, and the method comprises the steps: obtaining the corresponding spectral intensities of emitted light generated by a specific element in a cavity at different sampling moments in the process of removing the photoresist after ion implantation; according to the spectral intensities corresponding to the two adjacent sampling moments, determining the change characteristic quantity of the spectral intensity at each sampling moment; and when the change characteristic quantity corresponding to the current sampling moment meets a preset condition, determining that the hardened layer removal process is close to an end point and controlling the wafer to descend from the current position to the direction of the heating base according to a preset relation so as to remove the hardened layer of the photoresist. The spectral intensity of the emitted light generated by the specific element is acquired, whether the hardened layer removal process is close to the end point or not is judged according to whether the change characteristic quantity of the spectral intensity meets the preset condition or not, and the wafer is controlled to descend for heating when the hardened layer removal process is close to the end point, so that the hardened layer is prevented from bursting at high temperature.

The heat preservation and insulation ceramic cup comprises a heat insulation shell, first heat insulation cotton is arranged on the inner wall of the heat insulation shell, a ceramic cup is arranged on the inner wall of the first heat insulation cotton, and a cup cover is connected to an opening of the heat insulation shell in a clamped mode. The first heat insulation cotton is arranged between the ceramic cup and the heat insulation shell, the heat insulation function is achieved, the heat insulation layer is arranged in the ceramic cup, heat insulation is further conducted on the ceramic cup, the ceramic cup is provided with the cup cover, the embedded block is arranged in the cup cover, and the second heat insulation cotton is arranged in the embedded block. When hot air in the ceramic cup rises, heat preservation is conducted through the second heat insulation cotton, then the heat preservation effect is achieved on the periphery and an outlet of the ceramic cup, a vent hole is formed in the cup cover, the situation that the ceramic cup bursts due to the fact that a large amount of hot air cannot be dissipated is avoided, and after some hot air is dissipated, the vent hole is blocked through a sealing plug, and the situation that the hot air is completely dissipated is avoided. And the sealing plug can be clamped in the circular groove when the vent hole is opened, so that the smaller sealing plug is prevented from being lost.

The invention discloses a backwash pre-filter, which relates to the technical field of liquid filtering devices. The technical scheme thereof mainly includes: a joint, a filter cup, a filter element and an opening and closing member, wherein the joint has a water inlet channel and a water outlet channel; the filter cup is connected to the joint and has a raw water cavity, a partition is arranged between the filter cup and the joint, and the partition has a central hole that can connect the water inlet channel with the raw water cavity; a guide groove is arranged in the joint, a conversion hole 1 that can connect the water inlet channel is arranged in the guide groove, the filter element is slidably arranged in the guide groove, the filter element has a clean water cavity that connects the water outlet channel, a conversion hole 2 that can connect the conversion hole 1 is arranged on the side wall of the clean water cavity, and a flange that can seal the central hole is arranged on the outer side of the filter element; a water outlet hole that connects the raw water cavity is arranged at the bottom of the filter cup, and the opening and closing member can block or open the water outlet hole. When the opening and closing member is opened, and the conversion hole 2 is connected to the conversion hole 1, and the flange seals the central hole, the backwash state can be entered, and the cleaning effect is good.

This utility model discloses a wooden door for use with a floor spring, including a front panel (1) and a back panel (2). Two vertical beams (3) are provided between the front panel (1) and the back panel (2). An upper horizontal beam (4) and a lower horizontal beam (5) are provided between the front panel (1) and the back panel (2). Multiple reinforcing beams (6) are provided between the front panel (1) and the back panel (2). A limiting beam (7) is provided on the inner side of one of the vertical beams (3). The upper and lower ends of the limiting beam (7) are fixed to the upper horizontal beam (4) and the lower horizontal beam (5) respectively. The front panel (1) and the back panel (2) are both fixed to the limiting beam (7). A tightly fitted iron square tube (8) is provided between the limiting beam (7) and the vertical beam (3). The bottom of the iron square tube (8) is provided with a connecting shaft (9) that passes through the lower horizontal beam (5). The bottom of the connecting shaft (9) is provided with a socket (10) that mates with the floor spring. This utility model has the advantage of a long service life.

The utility model provides an evaporation film material structure and evaporation equipment, and relates to the technical field of evaporation film coating. The evaporation film material structure comprises a film material block and film material particles, the film material block and the film material particles are the same in component, and the film material particles are laid on the whole top face of the film material block. According to the evaporation film material structure, during evaporation, splashing caused by further expansion of cracks of the film material blocks can be avoided, the evaporation rate is stable, and the evaporation film material structure can adapt to long-time evaporation.

The utility model relates to the technical field of faucets, and provides an integrated faucet which comprises a faucet body, a water outlet pipe, a switch handle and a soap dispenser hole are arranged on the faucet body, a limiting pipe penetrates through the soap dispenser hole, a soap dispenser is installed on the soap dispenser hole, one end of the soap dispenser is connected to a guide pipe, and the other end of the soap dispenser is connected to a water outlet pipe. The other end of the guide pipe is connected to a liquid soap storage device, a ceramic chip mechanism is arranged in the faucet body, at least one first limiting hole is formed in the ceramic chip mechanism, and the limiting pipe penetrates through and is clamped in the first limiting hole. The water outlet pipe and the soap dispenser are installed on the faucet body together, a soap bottle does not need to be additionally placed on the table top of the water tank, the phenomenon of tipping is avoided when liquid is taken, a soap dispenser hole does not need to be additionally formed in the water tank, use space is greatly saved, the table top of the water tank is cleaner and tidier, and the water tank is convenient to take and use. The technical problem that an existing soap dispenser is independently placed on a table top of a water tank, and consequently space is occupied is solved.

The utility model discloses a high-temperature bag capable of being heated by microwaves, which relates to the technical field of food packaging bag production and comprises a food packaging bag, an easy-to-tear strip is arranged on the surface of the food packaging bag, a liquid storage groove is formed in the top of the food packaging bag, and a pressure relief pipe is fixedly connected to the top of the food packaging bag. The top of the food packaging bag is fixedly connected with a spiral exhaust pipe, and the spiral exhaust pipe is communicated with the pressure relief pipe. Juice contained in the gas gradually flows to the bottom of the spiral exhaust pipe under the action of self gravity and flows into the liquid storage groove, and the discharged juice is collected through the liquid storage groove, so that the juice is prevented from flowing to the inner wall of the microwave oven, the experience feeling of food heating of people is improved, and the practicability of the microwave oven is improved. People do not need to clean juice attached to the inner wall of the microwave oven any more.

The utility model discloses a waste cobalt source rod treatment container which comprises a protective barrel and a shielding barrel, a plurality of bone-shaped connectors are evenly distributed on the outer side wall of the protective barrel in the circumferential direction, the shielding barrel extends into the protective barrel and is connected with the protective barrel in a sealed mode, and a buffering rubber mat is arranged on the inner bottom wall of the shielding barrel. A plurality of buffering rubber rings are arranged on the inner side wall of the shielding barrel at intervals from top to bottom, a shielding cover is connected to the shielding barrel in a threaded mode, a first spring is arranged on the bottom wall of the shielding cover, a sheath is connected to the first spring, a plurality of columnar conical holes are formed in the shielding cover, and conical plugs are movably plugged in the columnar conical holes. A limiting cover is in threaded connection with the interior of the cylindrical conical hole, a second spring is arranged between the limiting cover and the conical plug, and a plurality of air outlet holes are formed in the limiting cover. The protective cover is simple in structure and high in protective strength.

The utility model belongs to the technical field of medical instruments, and discloses a puncture guide wire which comprises a puncture body and a rigidity balancing sleeve. The puncture body comprises at least two first puncture sections which are connected in sequence, and in every two adjacent first puncture sections, the diameter of the first puncture section close to the far end of the puncture guide wire is smaller than that of the other first puncture section; the number of the rigidity balance sleeves is at least two, the rigidity balance sleeves correspond to the first puncture sections in a one-to-one mode, the corresponding first puncture sections are fixedly sleeved with the rigidity balance sleeves, and in every two adjacent rigidity balance sleeves, the outer diameter of the rigidity balance sleeve close to the far end of the puncture guide wire is larger than that of the other rigidity balance sleeve. The flexural rigidity of the rigidity balance sleeve close to the far end of the puncture guide wire is larger than that of the other rigidity balance sleeve. Puncture guide wires with different strengths do not need to be replaced repeatedly, so that the operation time is saved, and the operation risk is reduced. And the size of the included angle opening of the U-shaped puncture head cannot be increased along with the feeding of the puncture guide wire, so that the blood vessel is prevented from being burst.

The utility model relates to the technical field of fire hydrants, and discloses a fire hydrant connecting terminal which comprises a fire hydrant body, connecting terminals are connected to the two sides of the surface of the fire hydrant body in a penetrating mode, a water distribution pipe is connected to the top faces of the connecting terminals in a penetrating mode, and a supporting frame is fixedly installed on the inner wall of the water distribution pipe. A telescopic mechanism is fixedly arranged on the top face of the supporting frame, and a sealing cover is fixedly arranged on the top of the telescopic mechanism. According to the fire hydrant connecting terminal, through the arrangement of the distributive pipe, the telescopic mechanism and the sealing cover, a fire hose is connected to the connecting terminal, instantaneous water flow is large when water flows out of the fire hydrant body, part of a water source upwells through the distributive pipe, the sealing cover is jacked open, the telescopic spring and the hydraulic rod A stretch along with the water, and part of the water source is discharged from the distributive pipe; therefore, the effect of reducing the instantaneous water pressure is achieved, the situation that the fire hose bursts due to too large instantaneous water pressure is avoided, and after water flow is stable, the telescopic spring drives the sealing cover to reset to seal the water distribution pipe.

The utility model relates to the technical field of printing machines, in particular to a tension control device of a photogravure press, which comprises a tension control device body and a smoothing component, and the smoothing component comprises a connecting frame, a rotating shaft, a smoothing roller and a mounting seat. The tension control device body is used for maintaining the tension stability of a whole machine system and preventing the situation that paper wrapping the paper guide rollers is broken or wrinkled due to the fact that the distance between the paper guide rollers is large or small, the connecting frame provides mounting conditions for the rotating shaft and the mounting base, the mounting base is arranged, the smoothing roller and the connecting frame are convenient to disassemble and assemble, and the working efficiency is improved. The paper is wound on the rotating shaft, the rotating shaft rotates to enable the paper to be transmitted to the tension control device, the smoothing roller is used for smoothing the transmitted paper, the phenomenon that the paper is bent when being transmitted to the tension control device is avoided, and the problem that when the tension control device is used, the paper is bent in advance and directly folded, and follow-up printing is affected is solved.

The present invention relates to the technical field of tree maintenance, specifically a bottle-inserted self-flowing dry-injection bottle for preventing resin back-sucking, comprising a bottle body and a medicine injection nozzle, wherein the bottle body comprises a bottle body and a bottle cap, and the bottle cap is detachably connected to the bottle mouth of the bottle body; the medicine injection nozzle is a slender conical tube that is small at the top and large at the bottom, with openings at both ends of the conical tube, and through holes are symmetrically opened on both sides of the medicine injection nozzle; the lower end of the medicine injection nozzle is detachably mounted on the medicine injection port of the bottle cap. The bottle-inserted self-flowing dry-injection bottle for preventing resin back-sucking provided by the present invention can not only prevent the problem of bottle body expansion and cracking caused by resin back-sucking, but also enable the dry-injection agent to achieve precise application of the medicine to improve the prevention and control efficiency of forest pests and diseases, without causing waste of medicines and environmental pollution, and is suitable for further promotion and application.

The utility model discloses an anti-freezing pressure regulating valve, and relates to the technical field of pressure regulating valves. The anti-freezing pressure regulating valve comprises a pressure regulating valve body, one side of the pressure regulating valve body is rotationally connected with a regulating rod, a pressure gauge is arranged at the top of the pressure regulating valve body, and a fixed leakage-proof device and a heat preservation device are arranged on the two sides of the pressure regulating valve body; the fixed leakage-proof device comprises a base, an air bag is fixedly connected to one side of the base, an air conveying pipe is fixedly connected to one side of the air bag, a sealed expansion air bag is fixedly connected to the other side of the air conveying pipe, the heat preservation device comprises a connecting pipe, an air pressure cabin is fixedly connected to the other side of the connecting pipe, and an air pressure heat preservation sleeve is slidably connected to one side of the air pressure cabin. The air bag can be extruded after the water pipe is in butt joint with the pressure regulating valve body, air in the air bag can be conveyed into the sealed expansion air bag through the air conveying pipe after the air bag is extruded, the sealed expansion air bag can expand, the connecting position of the water pipe and the pressure regulating valve body is sealed and fixed, and practicability is high.

The utility model discloses a ceramic heating plate electrode leading-out structure, which comprises a body assembly and an electrode leading-out assembly, the body assembly comprises a ceramic plate and a lower shell, the ceramic plate is arranged on the lower shell, and a cavity is formed between the ceramic plate and the lower shell; a pair of electrode leading-out assemblies are arranged, the pair of electrode leading-out assemblies are installed in a cavity between the ceramic disc and the lower shell, each electrode leading-out assembly comprises a threaded pipe, and the threaded pipes are installed on the side wall of the bottom of the ceramic disc. The threaded pipe is connected with the heating plate, and the notch is axially reserved in the threaded pipe, so that expansion stress generated when the threaded pipe is heated can be absorbed, and the heating plate is prevented from bursting due to thermal stress after the threaded pipe is connected; meanwhile, the threaded pipe and the threaded groove are connected without a closed space, air pressure inside and outside the threaded groove is balanced, air pressure difference is avoided, and expansion of the heating disc is avoided; the connecting structure is firm in connection, high in drawing resistance, replaceable and convenient to maintain in the later period.

The invention relates to a container dispersing system for powder, a vibration platform, a container, a telescopic hose, a container turning machine, a blower, a buffer bin and a dust collector; wherein a vibration platform is arranged below the container turning machine, and the container turned over by the container turning machine is placed on the vibration platform; after the container lining bag is laid in place inside the container, the inlet end of the container lining bag is fixed below the telescopic hose through a clamping mechanism; an electric contact pressure gauge is arranged on the upper part of the telescopic hose, and the inlet of the telescopic hose is connected to the outlet of a magnetic separator; the telescopic hose is connected to the blower; the system connects the lining bag to the telescopic hose through a pneumatically compressed entrainment mechanism, and automatically detects the internal air pressure of the lining bag through the electric contact pressure gauge; the electric contact pressure gauge is simultaneously interlocked with the blower, so as to realize full automation of inflation, feeding and exhaust during the container loading process, and the operation is convenient and simple, and the sealing performance is good.

The utility model relates to an explosion-proof motor shell hydraulic pressure test device, and belongs to the technical field of explosion-proof motor production, the explosion-proof motor shell hydraulic pressure test device comprises a base, an upper sealing gasket, a lower sealing gasket and a hydraulic mechanism arranged on the base, the surface of the upper sealing gasket is provided with a water inlet hole, the output end of the hydraulic mechanism is fixedly provided with a pressing block, and the pressing block is provided with a water inlet pipe; the water inlet pipe is communicated with the water inlet hole and externally connected with a pressure system, the surface of the base is concavely provided with a water storage tank, the water storage tank is externally connected with a drainage pipe, sliding rails are symmetrically fixed to the base, supporting tables are symmetrically and slidably connected to the sliding rails, and lower sealing gaskets are arranged on the surfaces of the supporting tables. According to the device, two supporting tables are arranged, when one supporting table moves to the bottom of the hydraulic mechanism for testing, the other supporting table can conduct feeding and discharging actions of a motor shell, the two supporting tables conduct testing alternately, feeding and discharging can be conducted on the other supporting table in the testing process of one motor shell, and therefore uninterrupted testing is achieved; and the test efficiency is improved.

The present invention provides a pipe joint, a pipeline bearing structure and a clothing processing device. The pipe joint comprises: a connecting portion, a flow channel is formed in the connecting portion, the flow channel is used to communicate with the pipe for liquid circulation; an air cavity, the air cavity is located on the upper side of the flow channel, and is connected to the flow channel through a connecting hole, and when the liquid in the flow channel solidifies, part of the liquid can enter the air cavity through the connecting hole. The present invention can prevent the liquid pipeline from bursting due to liquid solidification.

The invention relates to the technical field of food packaging, and discloses a moisture-proof one-way pressure release valve assembly for packaging application, which comprises a valve body, the valve body is of an integrated structure, a circular hole for ventilation is formed in the middle of the valve body, a ventilation membrane is arranged at the bottom of the valve body, and the membrane surface of the ventilation membrane has oleophobic and hydrophobic characteristics. A gasket integrally welded with the bottle cap is arranged on the upper portion of the valve body, the gasket is used for being combined with the bottle cap to play a sealing role, a gasket pressing ring and an inner silica gel gasket are sequentially arranged between the gasket and the valve body from top to bottom, and the gasket pressing ring is used for tightly locking the inner silica gel gasket in a groove of the valve body. The effect of one-way ventilation and pressure relief can be achieved, air pressure generated in the package can be released, negative pressure is prevented from being formed in the package, and package spalling caused by too high air pressure in the package is prevented; gas can be allowed to pass through but moisture is not allowed to pass through, so that external moisture can be prevented from entering the package, and contents are prevented from going bad.

The application relates to the technical field of cooking utensils, in particular to a combustion device and a gas stove. The combustion device comprises a burner, a pot rack which is arranged around the outer side of the burner and is fixed with the burner, the outer periphery of the burner is tightly attached to the pot rack, the pot rack is provided with a heat storage cavity which is open downward and surrounds the burner, a partition plate is installed at the bottom of the pot rack to close the opening of the heat storage cavity, the middle part of the partition plate is provided with a hole position, and the bottom end of the burner is provided with an air inlet part which penetrates into the hole position. The partition plate has a heat insulation function, can effectively isolate the heat generated by the burner from radiating to the panel of the gas stove, reduces the temperature rise of the panel, and avoids scalding or panel explosion. The middle part of the partition plate is provided with a hole position, the bottom end of the burner is provided with an air inlet part which penetrates into the hole position. The above-mentioned arrangement ensures that the partition plate does not hinder the primary air intake of the burner, and ensures the smooth combustion of the burner.

This invention discloses a polysiloxane microsphere, its preparation method, and its application. The polysiloxane microsphere has a D50 particle size of 0.1~10μm; the structural defect ratio S of the polysiloxane microsphere is S=T2 / T3, where S is 0.20~0.70; T2 refers to... 29 The relative abundance of Si NMR chemical shifts in the range of -50 to -60 ppm, T3 refers to... 29 The relative content of SiNMR chemical shifts in the range of -60 to -70 ppm; the low-temperature volatile content W of the polysiloxane microspheres is W = K1 / (K1+K2), where W is 0.027~0.893; K1 is the thermal weight loss ratio at 25℃~200℃, and K2 is the thermal weight loss ratio at 200℃~400℃. This solves the technical problem in the prior art where highly cross-linked polysiloxane microspheres form a dense network during calcination, making it difficult for internal pyrolysis gaseous products to escape and be removed.

The height-adjustable air bag pillow comprises a pillow body, the front end of the pillow body protrudes, the left end and the right end of the pillow body are equal in height and are gradually sunken towards the middle, the pillow body is filled with a pillow inner, and the interior of the pillow inner is hollowed out and provided with an air bag structure. The air bag structure comprises two side air bags and a head and neck air bag, the head and neck air bag is arranged at the front end of the middle of the pillow body, the two side air bags are arranged at the left end and the right end of the pillow body respectively, air bag holes are formed in the rear end faces of the side air bags and the head and neck air bag, and the air bag holes are communicated with the inflation hole through inflation hoses. The height of the air bag pillow can be adjusted, so that appropriate physiological curvature support can be provided for the cervical vertebra of a rehabilitation patient no matter the rehabilitation patient lies on the back or lies on the side, the comfort degree is improved, and meanwhile the situation that the cervical vertebra of the rehabilitation patient is damaged due to the fact that the pillow height is not corresponding can be effectively avoided. The cervical vertebra of the patient is in an abnormal physiological curvature state for a long time, and cervical vertebra diseases are easily caused.

A meter glass dismounting and firmness measuring device comprises a bottom plate (4), a plurality of limiting connecting rods (3) installed on the bottom plate (4), and a top plate (1) located above the bottom plate (4) and fixedly connected with the limiting connecting rods (3). Two-stage stepped holes are formed in the top plate (1) and comprise a first-stage stepped hole and a second-stage stepped hole; the meter glass dismounting and firmness measuring device further comprises a limiting ring (2) which is detachably installed in the first-stage step hole, a pressing block (10) which is arranged in the limiting ring (2) in a relatively sliding and penetrating mode, a double-faced adhesive tape (12) which is pasted on the bottom face of the pressing block (10), and a driving device which is used for driving the pressing block (10) to be bonded through the double-faced adhesive tape (12) and downwards press the meter glass piece (13). The meter glass dismounting and firmness measuring device is novel in design and high in practicability.

The invention relates to the technical field of polyurethane resin, in particular to explosion-proof oil for preventing paper from bursting and a preparation method of the explosion-proof oil. The explosion-proof oil is prepared from the following raw materials: diisocyanate, a chain extender, polyol, a catalyst, tartaric acid, a pH value regulator, deionized water, acetone, a flame retardant, a lubricant, a leveling agent, a defoaming agent, an antioxidant, an anti-ultraviolet agent and a functional filler. The chain extender is formed by matching 2, 2-dimethylolpropionic acid with small molecule diol; the polyol is micro-branched polyester diol with the molecular weight of 2000 to 5000 or mixed polyol formed by matching the micro-branched polyester diol with the molecular weight of 2000 to 5000 with polyether diol and / or polycarbonate diol with the molecular weight of 1000 to 2000. The anti-explosion oil provided by the invention can prevent paper from bursting and improve the use performance of the paper on a packaging material, and the anti-explosion oil is a water-based emulsion system and is more environment-friendly and green.

The utility model discloses an anti-cracking and anti-explosion resin grinding wheel which comprises a resin grinding wheel body and a connecting shaft, the connecting shaft penetrates through the resin grinding wheel body and is in sliding fit with the resin grinding wheel body, the rear side of the outer wall of the connecting shaft is in threaded connection with a fixing block, and the anti-cracking and anti-explosion resin grinding wheel further comprises heat dissipation holes formed in the resin grinding wheel body. Four heat dissipation holes are annularly distributed at equal intervals, reset cavities are formed in the outer sides of the heat dissipation holes, the reset cavities communicate with the heat dissipation holes, shielding plates are arranged in the reset cavities, one ends of the shielding plates extend into the heat dissipation holes, and the shielding plates are in sliding fit with the heat dissipation holes. After the anti-cracking and anti-explosion resin grinding wheel is started, the shielding plate can be thrown into the reset cavity through centrifugal force, heat of the resin grinding wheel can be guided into the heat dissipation holes through the heat conduction graphite strips, the heat dissipation holes communicate with the outside, and therefore the heat can be dissipated into the environment, the effective heat dissipation effect is achieved, and burst caused by the fact that the temperature of the resin grinding wheel is too high is avoided.