45results about How to "Same tension" patented technology

A metering device for an injection molding unit includes a base body having an antechamber in fluid communication with a feed channel for introduction of plastic material, and a metering chamber in fluid communication with a injection channel. The antechamber and the metering chamber are connectable with one another by a closeable passageway. Movably arranged in the base body between the antechamber and the metering chamber is a displacement member in the form of a piston to separate the antechamber and the metering chamber. The piston has a first end face which demarcates the antechamber and a second end face which demarcates the metering chamber, with the first end face defining an effective area which is smaller than an effective area of the second end face.

The invention belongs to the technical field of security and protection facilities and particularly relates to an invisible anti-theft net comprising an upper beam, a lower beam and steel wires. The upper beam comprises an upper frame body, an upper mounting plate is connected to the upper frame body, and upper mounting holes are formed in the upper mounting plate. Upper wire penetrating holes areformed in the bottom of the upper frame body, wire outlet holes are formed in the rear side wall of the upper frame body, and a fixing mechanism is connected to the rear side wall of the upper framebody. A wire winding mechanism is mounted in the upper frame body, the lower beam comprises a lower frame body, and a lower mounting plate is connected to the lower frame body. Lower mounting holes are formed in the lower mounting plate, and lower wire penetrating holes are formed in the top of the lower frame body. Fixing heads are connected to the lower ends of the steel wires and mounted in thelower frame body, and the steel wires sequentially penetrate through the lower frame body and the upper frame body, are wound around the wire winding mechanism and then penetrate through the rear side wall of the upper frame body to be connected with the fixing mechanism. According to the invisible anti-theft net, the mounting process is simple and rapid, and after tension of one certain steel wire is reduced or the certain steel wire is broken, the other steel wires can still take the protection effect; and the later-period maintenance time can be shortened, and the maintenance cost is reduced.

The invention discloses a solder resist printing machine for a circuit board. The structure of a screen printing frame comprises a screen mounting opening, a frame body, a pressing opening, an imprinting plate and a pressing sliding block. Symmetrical pressing openings are formed in the upper side and the lower side of the frame body; an impressing plate and a flattening sliding block which are matched with the impressing opening are arranged on the impressing opening; the space in the middle of the frame body is a silk screen mounting opening; a flattening sliding block matched with the pressing opening is mounted in the pressing opening. According to the invention, the two flattening sliding blocks are used for smoothly sliding in the pressing opening provided with the silk screen, thereby preventing a screen made in an inclined weaved manner or made of a nylon material from creasing; by means of the design of the shifting block and the stopping block on the flattening sliding block,the stopping block is convenient for an operator to hold, the stopping block is arranged in front of the flattening sliding block for stopping and increasing friction when the operator holds the flattening sliding block, thereby further preventing an operation from being separated from the handle.

The invention provides a method for compensating tension of elastane yarns of a vertical elastane yarn warping machine. In the method, the total length of the elastane yarns and the preset linear velocity of a creel roller are inputted through an human-machine interface; a programmable controller divides the current elastane yarn into 20 equal parts in accordance with the total length according to the setting of the human-machine interface so as to obtain 21 points; tension values of the 21 points are detected by a yarn tension detecting device, and the final tension values of the 21 points are saved by the programmable controller, and a compensation curve is drawn; the length of the current elastane yarn is detected by an encoder, and the programmable controller calculates a compensationvalue of the elastane yarn corresponding to the current length according to a mathematical model; and the programmable controller can calculate the linear velocity of the creel roller of the current length according to the compensation value of the elastane yarn corresponding to the current length, which is calculated in the step d, and regulates the linear velocity of the creel roller so as to regulate the tension of the elastane yarn. The method can ensure stable warping quality for the elastane yarn under a condition of large variation of temperature and humidity.

The invention belongs to the technical field of security and protection facilities and particularly relates to an invisible anti-theft net comprising an upper beam, a lower beam and steel wires. The upper beam comprises an upper frame body, an upper mounting plate is connected to the upper frame body, and upper mounting holes are formed in the upper mounting plate. Upper wire penetrating holes areformed in the bottom of the upper frame body, wire outlet holes are formed in the rear side wall of the upper frame body, and a fixing mechanism is connected to the rear side wall of the upper framebody. A wire winding mechanism is mounted in the upper frame body, the lower beam comprises a lower frame body, and a lower mounting plate is connected to the lower frame body. Lower mounting holes are formed in the lower mounting plate, and lower wire penetrating holes are formed in the top of the lower frame body. Fixing heads are connected to the lower ends of the steel wires and mounted in thelower frame body, and the steel wires sequentially penetrate through the lower frame body and the upper frame body, are wound around the wire winding mechanism and then penetrate through the rear side wall of the upper frame body to be connected with the fixing mechanism. According to the invisible anti-theft net, the mounting process is simple and rapid, and after tension of one certain steel wire is reduced or the certain steel wire is broken, the other steel wires can still take the protection effect; and the later-period maintenance time can be shortened, and the maintenance cost is reduced.

The invention belongs to the technical field of new material manufacturing, and specifically relates to an intelligent die-cutting machine for preparing polyester plastic film sheets, which includes a base plate on which a first reversing roller, a winding roller, and a second reversing roller parallel to each other are installed. , conveying roller, the first driving roller and the second driving roller, and the first sealing cylinder, the second sealing cylinder and the portal frame; the outer surface of the first driving roller and the second driving roller is installed with a conveyor belt; there are two conveyor belts a circular through groove, and a through hole is evenly opened around the circular through groove; a hollow sealing ring is installed on the outer surface of the first sealing cylinder; Two piston barrels; a cutting mechanism is installed on the top plate of the portal frame. When the invention is used for circular cutting of polyester plastic film, the processing efficiency is improved, and the injury of the operator's hand by the cutting blade is avoided. Wrinkles will not be formed on the polyester film belt during the cutting process, and the edge of the circular sheet is Smooth and jagged.