47results about How to "To achieve the purpose of safe use" patented technology

The invention relates to a flame retardant antistatic toughening PVC (Poly Vinyl Chloride) pipe for methane. The pipe is produced and prepared by adding a nanometer strengthening and toughening material and an antistatic and fire retardant material to polyvinyl chloride resin. According to the flame retardant antistatic toughening PVC pipe for methane, the coordinative antistatic effects of alkyl sulfonic acid and conductive carbon black as well as the coordinative flame retardant smoke suppression effects of antimonous oxide, and tricresyl phosphate or aluminium hydroxide are fully utilized, so that the purpose of safely using the flame retardant antistatic toughening PVC pipe for methane in the methane transportation filed can be achieved along with the outstanding toughening and strengthening material. Compared with the traditional plastic pipe, the flame retardant antistatic toughening PVC pipe for methane has relatively high durable performance and relatively high safety, is specifically suitable for the fields of outdoor branch pipes for methane and home-entering introducing pipes, can effectively improves the safety in use, reduces the possibility that a pipeline is cracked and leaks gas due to an accidental impacting and the possibility that the pipeline causes an antistatic fire due to the reduced whole antistatic effect, cannot fuel the fire in case the fire occurs, generates little smoke, and reduces the risk of the fire to the affected residents and firefighters.

The invention discloses a safety socket. The safety socket comprises a socket shell, a first sliding block stopper, a second sliding block stopper and a button part, wherein a first limiting structure is arranged between the button part and the first sliding block stopper, and a second limiting structure is arranged between the button part and the second sliding block stopper; movement of the button part to the socket shell is stopped through the first limiting structure and / or the second limiting structure so as to limit further insertion of a plug into the socket shell; or under a condition of recession of the first sliding block stopper and the second sliding block stopper due to an extrusion effect, stopping on the button part by the first limiting structure and the second limiting structure is removed. The safety socket provided by the invention has multiple protection effects, so that conditions of insertion of an unmatched plug into the socket and half insertion of the plug can be avoided; and meanwhile, the safety socket has the effects of electric shock prevention caused by mistake insertion, and water splashing prevention, and is reasonable in design, convenient to use, safe and higher in reliability, and capable of realizing safety in use.

The invention discloses a flame-retardant anti-static PVC (Polyvinyl Chloride) tube and a preparation method thereof. The flame-retardant anti-static PVC tube comprises the following raw materials: a polyvinyl chloride resin, a filling agent, a stabilizer, an impact modifier, a lubricant, an inorganic flame retardant and an anti-static agent, wherein the anti-static agent consists of calcined kaolin, conductive carbon black and titanium dioxide; and the inorganic flame retardant consists of brucite powder and sepiolite. The preparation method comprises the following steps: 1) mixing the filling agent, the inorganic flame retardant and the polyvinyl chloride resin for 2-5 minutes at a high speed; and 2) further adding the impact modifier, the stabilizer, the lubricant and the anti-static agent into the mixture of the step 1), mixing for 10-15 minutes at 100-110 DEG C, after uniform mixing, transferring into a cooling stirring, stirring for 3-5 minutes at 40-50 DEG C at a slow speed, and finally performing extrusion by using a conical two-screw extruder at 180-190 DEG C, thereby obtaining the tube. The tube is good in flame retardancy and anti-static property, and can be applied to fields such as marsh gases and coal.

The invention discloses a pulling device of a brake cable of a cart. The pulling device of the brake cable of the cart comprises a pressing block (1), a lever bar (2) and a casing pipe (3), wherein the lever bar (2) is arranged inside the inner cavity (41) of a push rod (4), the casing pipe (3) can move up and down to wrap the upper portion of the push rod (4), an opening (42) is formed in the top of the push rod (4), the lower portion of the pressing block (1) stretches into the inner cavity (41) of the push rod (4) through the opening (42) to be connected with one end of the lever bar (2) in a supporting mode, the other end of the lever bar (2) is connected with the brake cable (5), the lever bar (2) is movably connected with the push rod (4) through a rotary shaft (6), and the upper portion of the pressing block (1) is supported on the inner wall of the top surface of the casing pipe (3). The pulling device of the brake cable of the cart has the advantages that when the casing pipe on the push rod is held by the hand and is pressed downward automatically under the action of the gravity, the casing pipe moves downwards to drive the pressing block to be pressed downward, a brake core is pulled upward, and the cart can be moved front and back normally; when the push rod is disengaged from the hand, one end of the lever bar tilts upward due to the self-weight of the lever bar and the casing pipe is driven move upward to return to the original position, namely the brake part is automatically locked by the brake core.

The invention relates to a flame retardant antistatic toughening PVC (Poly Vinyl Chloride) pipe for methane. The pipe is produced and prepared by adding a nanometer strengthening and toughening material and an antistatic and fire retardant material to polyvinyl chloride resin. According to the flame retardant antistatic toughening PVC pipe for methane, the coordinative antistatic effects of alkyl sulfonic acid and conductive carbon black as well as the coordinative flame retardant smoke suppression effects of antimonous oxide, and tricresyl phosphate or aluminium hydroxide are fully utilized, so that the purpose of safely using the flame retardant antistatic toughening PVC pipe for methane in the methane transportation filed can be achieved along with the outstanding toughening and strengthening material. Compared with the traditional plastic pipe, the flame retardant antistatic toughening PVC pipe for methane has relatively high durable performance and relatively high safety, is specifically suitable for the fields of outdoor branch pipes for methane and home-entering introducing pipes, can effectively improves the safety in use, reduces the possibility that a pipeline is cracked and leaks gas due to an accidental impacting and the possibility that the pipeline causes an antistatic fire due to the reduced whole antistatic effect, cannot fuel the fire in case the fire occurs, generates little smoke, and reduces the risk of the fire to the affected residents and firefighters.

A surge protector includes a varistor element, a gas discharge tube, a voltage limiting element, a heat-generating element and a heat-conducting terminal with low heat resistance, the heat-generatingelement is connected in series with the voltage limiting element and is connected in parallel with the varistor element, and the series-parallel branch circuit is connected in series with the gas discharge tube to form a single-port combined circuit, wherein, the performance of the varistor element to withstand surge shock is higher than that of the voltage-limiting element to withstand surge shock, and the varistor element's varistor voltage value is higher than that of the voltage-limiting element's on voltage value; one of the two lead-out terminals of the single-port combination circuit isa low thermal resistance thermal conduction terminal, which is thermally coupled with the heating element, or the low thermal resistance thermal conduction terminal is thermally coupled with the voltage limiting element, or the low thermal resistance thermal conduction terminal is thermally coupled with the gas discharge tube. The invention enables the SPD to exit the circuit in an open circuit mode and improves the safety.

The invention discloses a high-safety surge protection circuit and a surge protection device. The protection circuit comprises a first voltage-sensitive resistor piece, a second voltage-sensitive resistor piece, a third voltage-sensitive resistor piece, a positive temperature coefficient thermistor piece and a leading-out terminal, wherein the positive temperature coefficient thermistor piece andthe third voltage-sensitive resistor piece are connected in series and then connected with the first voltage-sensitive resistor piece in parallel, the series-parallel branch circuit and the second voltage-sensitive resistor piece are connected in series to form a single-port combination circuit. The surge impact withstanding performance of the first voltage-sensitive resistor piece is higher thanthat of the second voltage-sensitive resistor piece. At least one of the two leading-out terminals of the single-port combination circuit is a low-heat-resistance heat conduction end. The second voltage-sensitive resistor piece and the third voltage-sensitive resistor piece form thermal coupling, and the third voltage-sensitive resistor piece and the positive temperature coefficient thermistor sheet form thermal coupling, and the low-heat-resistance heat conduction end and one or two of the second voltage-sensitive resistor piece and the positive temperature coefficient thermistor piece are thermally coupled with each other at the same time.

Provided is a brake device of a cart. A rolling element (7) capable of rotating is arranged in the middle of a through cavity (11), the rolling element (7) is linked together with a wheel (3), radial protruding portions (71) are distributed on the circumference of the rolling element (7), a notch (72) is formed between every two adjacent protruding portions (71), an inserting column (4) capable of moving upwards and downwards is arranged in the through cavity (11) in a supporting column (1) located above the rolling element (7), and the top of the inserting column (4) is connected with a pulling rope (2). When the rolling element (7) rotates to a position, below the inserting column (4), of the notches (72), the structure including that the lower end of the inserting column (4) can be inserted into one of the notches (72) and the inserting column (4) can be pulled out of the one of the notches (72) through the pulling rope (2) is arranged in the through cavity (11). The brake device of the cart has the advantages that whether the cart operates on a planar road surface or a slope road surface, as long as no external force acts, the inserting column in the supporting column can be automatically inserted into one of the notches, and the cart can be automatically stopped; accordingly, the purpose of safe using is realized.

The invention belongs to the field of medical injector, and specially relates to an injector capable of retracting the needle automatically, which comprises a needle barrel, a needle, a push-rod handle and a push-rod body. A piston sealed with an inner wall of the needle barrel is sleeved on the outer circumference at the upper end of the push-rod handle. The push-rod handle is provided on the lower end. The push rod is in a hollow structure. An annular convex shoulder converging inwards is formed on the upper end of the push-rod body. A chuck is disposed on the annular convex shoulder. A blind hole with an opening upward is arranged in the middle of the upper portion of the chuck. An annular concave slot is provided in the middle of the chuck and disposed in the inner cavity of the push-rod body. A spring capable for completely pulling the chuck into the inner cavity of the push-rod body is disposed in the inner cavity of the push-rod body. When the push-rod body is pushed to the bottom of the matched injector needle barrel, the needle of the injector abuts against the chuck, and the upper portion of the chuck is inserted into an end portion of the needle far away from a tip of the needle. The invention is simple in structure, convenient for use, low in cost, easy for large scale production, and suitable for the injector capable of retracting the needle automatically.

The invention provides an automatic control device of a handcart. The automatic control device comprises a supporting column (1), wherein the supporting column (1) is internally provide with a vertical through cavity (11); the through cavity (11) is internally provided with a rotary drum (7) capable of rotating; the rotary drum (7) and wheels (92) are mutually linked; the rotary drum (7) and central holes of the wheels are rotatably sleeved into wheel shafts (6); the circumference of the rotary drum (7) is provided with a radial inserting hole (74); the through cavity (11) is internally provided with an inserting rod (4) which can move up and down; the inserting rod (4) is connected with a pull rope (2); when the rotary drum (7) is rotated to the inserting hole (74) and is located below the inserting rod (4), the lower end of the inserting rod (4) can be inserted into the inserting hole (74); and a structure that the inserting rod (4) is pulled out from the inserting hole (74) can be arranged in the through cavity (11) through a pull rope (2). The automatic control device of the handcart disclosed by the invention has the advantages that whether the handcart is on a plane road surface or on an inclined slope road surface, the inserting rod in the supporting column can be automatically inserted into the inserting hole under the effect of no external force and the handcart can be automatically stopped; and therefore, the aim of safe utilization is realized.