Recovery device and recovery method for preparation of high-strength heat-resistant polyester staple fibers

Abstract

The invention belongs to the technical field of fiber preparation and recovery, and particularly relates to a recovery device and method for preparation of high-strength heat-resistant polyester staple fibers, the recovery device comprises a recovery box and a controller mounted on the outer side wall of the recovery box, two opposite side walls of the recovery box are provided with threading holes, and an oil discharge pipe is inserted in the bottom of the recovery box; the device further comprises multiple sets of heat insulation wire penetrating square pipes, and the multiple sets of heat insulation wire penetrating square pipes are all installed on the outer side wall of the recycling box and communicate with the corresponding wire penetrating holes. Based on the oil amount of each polyester staple fiber, the oil amount recovered from the polyester staple fibers can be automatically regulated and controlled, the recovery amount of redundant oil is increased to the maximum extent under the condition of ensuring that the polyester staple fibers absorb a proper amount of oil, the quality of the polyester staple fibers can be ensured, oil waste can be reduced, and the production cost is reduced. And when the fiber oil liquid is recycled, the phenomenon that fibers are excessively extruded and abraded is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of fiber preparation and recycling, and in particular relates to a recycling device and a recycling method for preparing high-strength heat-resistant polyester staple fibers. Background Art

[0002] High-strength heat-resistant polyester staple fibers are prepared by optimizing polymerization, spinning and post-treatment processes. The basic process is as follows: polyester chips are melted at high temperature and then extruded through a spinneret to form a filament bundle. After being converged by a buncher, the filament bundle is subjected to multi-stage stretching to improve the orientation degree, and then crimped to endow the fibers with fluffiness. Among them, after the polyester chips are melted and extruded at high temperature to form a filament bundle, the fiber filaments are generally oiled. The oil liquid can form a protective film on the fiber filaments, improve the bundling property and smoothness of the fiber filaments, and reduce the friction coefficient. In order to reduce the waste of the oil liquid, it is necessary to recycle the oil liquid. For example, a polyester staple fiber post-processing oil agent recycling system disclosed in Patent Publication No. CN204311171U.

[0003] When oiling polyester staple fibers, the fiber filaments coming out of the buncher usually immerse in an oil tank to fully contact with the oil liquid. However, when the fiber filaments are removed from the oil tank, the excess oil liquid on the surface will gather and drip, which not only causes waste of the oil liquid, but also dirties the environment. The traditional method is to use an oil scraping roller or an oil scraping plate to scrape off the excess oil liquid, but this requires applying pressure to the fibers, which easily causes wear of the fiber filaments. In addition, due to the possible uniformity difference during the melting of the raw materials in the early stage, the adsorption capacities of each fiber filament for the oil liquid are different, which may result in incomplete or excessive recovery of the oil liquid on the surface of the fiber filaments during oil scraping recovery. Whether the oil liquid is too much or too little in the fiber filaments will affect the strength and heat resistance of the polyester staple fibers. If the oil liquid is too much, the oil agent on the fiber surface accumulates, migrates and volatilizes at high temperature, affecting the heat resistance, and may also cause the fibers to adhere to each other, reducing the strength. If the oiling is too little, a complete protective film cannot be formed on the fiber surface, and the fibers are easily damaged due to friction during processing and use, resulting in a reduction in strength. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems and provide a recycling device and a recycling method for preparing high-strength heat-resistant polyester staple fibers.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A recycling device for preparing high-strength heat-resistant polyester staple fibers includes a recycling box and a controller installed on the outer side wall of the recycling box. Through holes for passing the filaments are installed on two opposite side walls of the recycling box, and an oil discharge pipe is inserted at the bottom of the recycling box. The device further includes: Multiple groups of heat-insulating wire-passing square tubes are all installed on the outer sidewall of the recycling box and are communicated with the corresponding wire-passing holes. The outer tube walls of multiple heat-insulating wire-passing square tubes in the same group are all fixedly installed with an intake hollow plate and an exhaust hollow plate together, and the intake hollow plate and the exhaust hollow plate are respectively arranged at both ends of the sidewall of the heat-insulating wire-passing square tube. The feeding unit is arranged on the side of each exhaust hollow plate away from the intake hollow plate and is fixedly connected to the outer sidewall of the recycling box. The feeding unit is used to drive the fiber wire to move. The hot gas supply unit is installed above multiple intake hollow plates and is used to send hot air flow into each intake hollow plate. Each heat-insulating wire-passing square tube is communicated with the corresponding intake hollow plate. Multiple exhaust air regulating units are all installed inside the corresponding exhaust hollow plates, and each heat-insulating wire-passing square tube is communicated with the corresponding exhaust hollow plate. Multiple condensing units are all installed on the sidewall of a group of heat-insulating wire-passing square tubes on the same side, and the liquid discharge end of the condensing unit and the sidewall of the recycling box are fixedly communicated with an oil return pipe together.

[0006] Preferably, the feeding unit includes two support frames fixedly installed on the outer sidewall of the recycling box, and electric push rods are installed on the end faces of the two support frames. The telescopic ends of the two electric push rods are fixedly connected together with a feeding plate. Multiple wire-passing holes coaxial with the wire-passing holes are formed in the sidewall of the feeding plate. Multiple fixed pressing plates are fixedly connected to the sidewall of the feeding plate close to the recycling box, and each fixed pressing plate is arranged below a row of wire-passing holes on the same side. An active pressing plate is arranged above each fixed pressing plate. Connecting rods are fixedly connected together on both sides between adjacent active pressing plates. Each active pressing plate is arranged above a row of wire-passing holes on the same side. Electromagnetic push rods are fixedly installed at both ends of the sidewall of the feeding plate, and the telescopic ends of the two electromagnetic push rods are fixedly connected to the bottom of the active pressing plate on the same side. The electric push rods and the electromagnetic push rods are both electrically connected to the controller.

[0007] Preferably, the hot gas supply unit includes a heating hollow plate arranged above each intake hollow plate. An air pump electrically connected to the controller is installed on the top of the heating hollow plate, and the air outlet end of the air pump is communicated with the inside of the heating hollow plate. Multiple heating rods are fixedly installed inside the heating hollow plate. Multiple support pipes are fixedly communicated together between the bottom of the heating hollow plate and the top of each intake hollow plate. Multiple intake round tubes are fixedly installed inside each intake hollow plate, and each heat-insulating wire-passing square tube is communicated with the corresponding intake round tube. An intake electric control valve electrically connected to the controller is installed inside each intake round tube. An air suction pipe is installed at the air suction end of the air pump.

[0008] Preferably, each of the air outlet control units includes a plurality of air outlet round tubes fixedly installed inside the air outlet hollow plate, and each heat insulation wire-passing square tube is communicated with the corresponding air outlet round tube. An air outlet electric control valve is installed inside each of the air outlet round tubes. A first photosensitive resistor is fixedly inserted into the tube wall of each air outlet round tube. A plurality of first infrared light-emitting lamps are fixedly installed on the inner wall of the air outlet hollow plate, and a light-transmitting hole corresponding to the position of the first infrared light-emitting lamp is formed in the tube wall of each round tube. The light emitted by each first infrared light-emitting lamp is projected onto the photosensitive surface of the first photosensitive resistor through the corresponding light-transmitting hole. The first infrared light-emitting lamp is electrically connected to the controller, and the controller controls the intake electric control valve and the air outlet electric control valve to work according to the electrical signal fed back by the first photosensitive resistor.

[0009] Preferably, each of the condensation units includes a heat insulation plate fixedly installed on the side wall of the same group of heat insulation wire-passing square tubes. A U-shaped hole is formed inside the heat insulation plate, and a U-shaped condensation tube is inserted inside the U-shaped hole. The U-shaped condensation tube is respectively provided with a water liquid inlet pipe and a water liquid discharge pipe, and the water liquid inlet pipe and the water liquid discharge pipe respectively seal the two hole ends of the U-shaped hole. An air inlet hole is formed in the hole wall of the U-shaped hole near the side of the water liquid inlet pipe. An air outlet pipe communicated with the air inlet hole is fixedly connected to the upper side of the tube wall of each air outlet hollow plate. An air outlet hole is formed in the hole wall of the U-shaped hole near the side of the water liquid discharge pipe. An oil dropping hole communicated with the oil return pipe on the same side is formed in the bottom of the U-shaped hole.

[0010] Preferably, a confluence hollow plate is installed on the tops of a plurality of the heat insulation plates. The confluence hollow plate is fixedly communicated with a plurality of confluence pipes, and each confluence pipe is communicated with the corresponding air outlet hole. A monitoring exhaust assembly is installed on the top of the confluence hollow plate.

[0011] Preferably, the monitoring exhaust assembly includes a machine cover fixedly inserted into the top of the confluence hollow plate. An exhaust pipe is fixedly inserted into the top of the machine cover. A normally open solenoid valve is installed inside the exhaust pipe. A second infrared light-emitting lamp and a second photosensitive resistor are arranged inside the machine cover, and the second infrared light-emitting lamp and the second photosensitive resistor are respectively installed on the inner walls of two opposite sides of the machine cover. A return pipe is fixedly inserted into the side wall of the machine cover above the second infrared light-emitting lamp, and a normally closed solenoid valve is installed inside the return pipe. The return pipe is communicated with the inside of the suction pipe.

[0012] A recovery method for preparing high-strength heat-resistant polyester staple fibers and a recovery device for preparing high-strength heat-resistant polyester staple fibers as described above. The recovery method includes the following steps: S1. Pass the polyester staple fibers that have passed through the oiling device through the corresponding threading holes, the heat-insulating threading square tube and the feeding unit, so that the polyester staple fibers are connected to the subsequent stretching equipment, and a certain length margin is left between the feeding unit and the subsequent stretching equipment, and then the liquid inlet and outlet ends of the condensing unit are connected to the external water pumping pipeline; S2, start the controller, which will control the hot air supply unit and each air outlet control unit to work; S3, the controller controls the hot air supply unit and the air outlet control unit to stop working every 40 seconds, and controls the feeding unit to work once; S4, after the feeding unit has finished working, the controller controls the hot air supply unit and the air outlet control unit to resume working, and repeats steps S3 and S4; S5. Regularly clean and maintain the interior of the condensing unit, recovery tank, oil drain pipe and oil return pipe.

[0013] Compared with the existing technology, the advantages of a recycling device and a recycling method for preparing high-strength heat-resistant polyester staple fibers are: Through the cooperation of the controller, multiple groups of heat-insulating wire-threading square tubes, air inlet hollow plates, air outlet hollow plates, and hot air supply units, the oil of the polyester staple fibers after being immersed in oil can be quickly recovered, and the air outlet control unit can be used to automatically control the amount of oil recovered from the polyester staple fibers based on the amount of oil in each polyester staple fiber, thereby ensuring that the polyester staple fibers absorb an appropriate amount of oil and maximizing the amount of excess oil recovered, which can not only ensure the quality of the polyester staple fibers, but also reduce oil waste. When the fiber oil is recovered, the fibers will not be excessively squeezed and worn.

[0014] Through the cooperation of the recovery box, wire threading holes and feeding units, and by setting the redundant amount of fibers, the polyester staple fibers can stay briefly inside each heat-insulating wire threading square tube, which will not affect the original preparation efficiency of the polyester staple fibers and can ensure the oil recovery effect of the polyester staple fibers. It can be directly installed on the original polyester staple fiber production line.

[0015] Through the set condensing unit, the recovered oil and gas can be condensed, and the oil can flow back into the oiling equipment, which is convenient for the reuse of the oil. In combination with the set confluence hollow plate, confluence pipe and monitoring exhaust components, the incompletely condensed oil and gas can be circulated to ensure its full condensation, avoid oil and gas escape as much as possible, and improve the recovery rate of the oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a recovery device for preparing high-strength heat-resistant polyester staple fibers provided by the present invention; Figure 2Schematic diagram of the connection structure of the heat-insulating wire-passing square pipe, the air inlet hollow plate and the air outlet hollow plate of a recycling device for preparing high-strength heat-resistant polyester staple fibers provided by the present invention; Figure 3 Schematic diagram of the structure of the feeding unit of a recycling device for preparing high-strength heat-resistant polyester staple fibers provided by the present invention; Figure 4 A recycling device for preparing high-strength heat-resistant polyester staple fibers provided by the present invention Figure 3 Enlarged view of the structure of part A in; Figure 5 Schematic diagram of the structure of the hot gas supply unit of a recycling device for preparing high-strength heat-resistant polyester staple fibers provided by the present invention; Figure 6 Internal top view structure diagram of the air inlet hollow plate of a recycling device for preparing high-strength heat-resistant polyester staple fibers provided by the present invention; Figure 7 Internal top view structure diagram of the air outlet hollow plate of a recycling device for preparing high-strength heat-resistant polyester staple fibers provided by the present invention; Figure 8 Schematic diagram of the structure of the condensation unit of a recycling device for preparing high-strength heat-resistant polyester staple fibers provided by the present invention; Figure 9 Internal structure diagram of the machine cover of a recycling device for preparing high-strength heat-resistant polyester staple fibers provided by the present invention; Figure 10 Internal structure diagram of the recycling box of a recycling device for preparing high-strength heat-resistant polyester staple fibers provided by the present invention.

[0017] In the figure: 1 recycling box, 2 controller, 3 wire-passing hole, 4 oil drain pipe, 5 heat-insulating wire-passing square pipe, 6 air inlet hollow plate, 7 air outlet hollow plate, 8 feeding unit, 81 support frame, 82 electric push rod, 83 feeding plate, 84 wire-passing hole, 85 fixed pressing plate, 86 movable pressing plate, 87 connecting rod, 88 electromagnetic push rod, 9 hot gas supply unit, 91 heating hollow plate, 92 air pump, 93 heating rod, 94 support pipe, 95 air inlet round pipe, 96 air inlet electric control valve, 97 suction pipe, 10 air outlet control unit, 101 air outlet round pipe, 102 air outlet electric control valve, 103 first photosensitive resistor, 104 first infrared light-emitting lamp, 105 light-transmitting hole, 11 condensation unit, 111 heat-insulating plate, 112 U-shaped hole, 113 U-shaped condensation pipe, 114 water liquid inlet pipe, 115 water liquid discharge pipe, 116 air inlet hole, 117 air outlet pipe, 118 air outlet hole, 119 oil dropping hole, 12 return oil pipe, 13 confluence hollow plate, 14 confluence pipe, 15 monitoring and exhaust assembly, 151 machine cover, 152 exhaust pipe, 153 normally open solenoid valve, 154 second infrared light-emitting lamp, 155 second photosensitive resistor, 156 return pipe, 157 normally closed solenoid valve. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0019] As Figures 1-10 shown, a recycling device for preparing high-strength heat-resistant polyester staple fibers includes a recycling box 1 and a controller 2 installed on the outer side wall of the recycling box 1. Thread-passing holes 3 are installed on two opposite side walls of the recycling box 1, and an oil discharge pipe 4 is inserted at the bottom of the recycling box 1. It further includes: multiple heat-insulating thread-passing square pipes 5, which are all installed on the outer side wall of the recycling box 1 and communicate with the corresponding thread-passing holes 3. The outer pipe walls of multiple heat-insulating thread-passing square pipes 5 in the same group are commonly fixedly installed with an air inlet hollow plate 6 and an air outlet hollow plate 7, and the air inlet hollow plate 6 and the air outlet hollow plate 7 are respectively arranged at both ends of the side wall of the heat-insulating thread-passing square pipe 5; a feeding unit 8 is arranged on the side of each air outlet hollow plate 7 away from the air inlet hollow plate 6 and is fixedly connected to the outer side wall of the recycling box 1. The feeding unit 8 is used to drive the fiber filaments to move. The feeding unit 8 includes two support frames 81 fixedly installed on the outer side wall of the recycling box 1, and electric push rods 82 are installed on the end faces of the two support frames 81. The telescopic ends of the two electric push rods 82 are commonly fixedly connected to a feeding plate 83. A plurality of wire-passing holes 84 coaxial with the thread-passing holes 3 are formed on the side wall of the feeding plate 83. A plurality of fixed pressing plates 85 are fixedly connected to the side wall of the feeding plate 83 close to the recycling box 1, and each fixed pressing plate 85 is arranged below a row of wire-passing holes 84 on the same side. An active pressing plate 86 is arranged above each fixed pressing plate 85. Connecting rods 87 are commonly fixedly connected to both sides between adjacent active pressing plates 86. Each active pressing plate 86 is arranged above a row of wire-passing holes 84 on the same side. Electromagnetic push rods 88 are fixedly installed at both ends of the side wall of the feeding plate 83, and the telescopic ends of the two electromagnetic push rods 88 are fixedly connected to the bottom of the active pressing plate 86 on the same side. The electric push rods 82 and the electromagnetic push rods 88 are both electrically connected to the controller 2. Protective materials such as leather can be provided on the surfaces of the fixed pressing plates 85 and the active pressing plates 86.

[0020] The hot air supply unit 9 is installed above the multiple intake hollow plates 6 for sending hot air flows into each intake hollow plate 6. Each heat insulation wire-passing square pipe 5 is communicated with the corresponding intake hollow plate 6. The hot air supply unit 9 includes a heating hollow plate 91 arranged above each intake hollow plate 6. A gas pump 92 electrically connected to the controller 2 is installed at the top of the heating hollow plate 91, and the air outlet end of the gas pump 92 is communicated with the inside of the heating hollow plate 91. A plurality of heating rods 93 are fixedly installed inside the heating hollow plate 91. A plurality of support pipes 94 are fixedly communicated between the bottom of the heating hollow plate 91 and the top of each intake hollow plate 6. A plurality of intake round pipes 95 are fixedly installed inside each intake hollow plate 6, and each heat insulation wire-passing square pipe 5 is communicated with the corresponding intake round pipe 95. An intake electric control valve 96 electrically connected to the controller 2 is installed inside each intake round pipe 95. An air suction pipe 97 is installed at the air suction end of the gas pump 92. The heating temperature of the heating rods 93 can be adjusted by the controller 2 according to the actual situation, and the initially set heating temperature is 80 °C.

[0021] A plurality of air outlet control units 10 are all installed inside the corresponding air outlet hollow plates 7, and each heat insulation wire-passing square pipe 5 is communicated with the corresponding air outlet hollow plate 7. Each air outlet control unit 10 includes a plurality of air outlet round pipes 101 fixedly installed inside the air outlet hollow plate 7, and each heat insulation wire-passing square pipe 5 is communicated with the corresponding air outlet round pipe 101. An air outlet electric control valve 102 is installed inside each air outlet round pipe 101. A first photosensitive resistor 103 is fixedly inserted into the pipe wall of each air outlet round pipe 101. A plurality of first infrared light-emitting lamps 104 are fixedly installed on the inner wall of the air outlet hollow plate 7, and a light-transmitting hole 105 corresponding to the position of the first infrared light-emitting lamp 104 is formed in the pipe wall of each round pipe. The light emitted by each first infrared light-emitting lamp 104 is projected onto the photosensitive surface of the first photosensitive resistor 103 through the corresponding light-transmitting hole 105. The first infrared light-emitting lamp 104 is electrically connected to the controller 2. The controller 2 controls the intake electric control valve 96 and the air outlet electric control valve 102 to work according to the electrical signal fed back by the first photosensitive resistor 103. When the infrared light illumination intensity received by the first photosensitive resistor 103 becomes higher, its own resistance decreases, and the intensity of the electrical signal fed back to the controller 2 becomes larger.

[0022] A plurality of condensation units 11 are all installed on the side wall of a group of heat-insulating wire-passing square pipes 5 on the same side, and the liquid discharge end of the condensation unit 11 and the side wall of the recovery tank 1 are fixedly connected and communicated with an oil return pipe 12. Each condensation unit 11 includes a heat-insulating plate 111 fixedly installed on the side wall of the same group of heat-insulating wire-passing square pipes 5. A U-shaped hole 112 is formed inside the heat-insulating plate 111, and a U-shaped condensation pipe 113 is inserted inside the U-shaped hole 112. The U-shaped condensation pipe 113 is respectively provided with a water liquid inlet pipe 114 and a water liquid discharge pipe 115, and the water liquid inlet pipe 114 and the water liquid discharge pipe 115 respectively seal the two hole ends of the U-shaped hole 112. An air inlet hole 116 is formed in the position of the hole wall of the U-shaped hole 112 close to the water liquid inlet pipe 114. An air outlet pipe 117 communicated with the air inlet hole 116 is fixedly connected to the upper side of the pipe wall of each air outlet hollow plate 7. An air outlet hole 118 is formed in the position of the hole wall of the U-shaped hole 112 close to the water liquid discharge pipe 115. An oil dropping hole 119 communicated with the oil return pipe 12 on the same side is formed in the hole bottom of the U-shaped hole 112, which can condense the oil gas and facilitate the recycling of the oil liquid.

[0023] A confluence hollow plate 13 is installed on the tops of a plurality of heat-insulating plates 111. The confluence hollow plate 13 is fixedly communicated with a plurality of confluence pipes 14, and each confluence pipe 14 is communicated with the corresponding air outlet hole 118. A monitoring exhaust assembly 15 is installed on the top of the confluence hollow plate 13. The monitoring exhaust assembly 15 includes a machine cover 151 fixedly inserted on the top of the confluence hollow plate 13. An exhaust pipe 152 is fixedly inserted on the top of the machine cover 151. A normally open solenoid valve 153 is installed inside the exhaust pipe 152. A second infrared light-emitting lamp 154 and a second photoresistor 155 are arranged inside the machine cover 151, and the second infrared light-emitting lamp 154 and the second photoresistor 155 are respectively installed on the inner walls of two opposite sides of the machine cover 151. A return pipe 156 is fixedly inserted in the side wall of the machine cover 151 above the second infrared light-emitting lamp 154, and a normally closed solenoid valve 157 is installed inside the return pipe 156. The return pipe 156 is communicated with the inside of the air suction pipe 97. When the infrared light intensity received by the second photoresistor 155 becomes higher, its own resistance decreases, and the intensity of the electrical signal fed back to the controller 2 becomes larger.

[0024] The operating principle of the present invention is described as follows: The polyester staple fibers passing through the oiling equipment pass through the corresponding wire threading holes 3, the heat-insulating wire threading square pipes 5, and the respective wire threading holes 84 on the feeding plate 83, and the polyester staple fibers are connected to the subsequent stretching equipment. A certain length margin is left between the feeding plate 83 and the subsequent stretching equipment (this margin can be set based on the speed at which the polyester staple fiber production line conveys the polyester staple fibers). Subsequently, the water liquid inlet pipe 114 is communicated with the water supply end of the external water liquid pumping pipeline, and the water liquid discharge pipe 115 is communicated with the return end of the external water liquid pumping pipeline (the external water liquid pumping pipeline is used to convey water liquid at a temperature of 10°C to 15°C), and then the controller 2 is started; After the controller 2 is started, the controller 2 controls the air pump 92 and the heating rod 93 to work. The air pump 92 can convey air flow into the heated hollow plate 91 (an air filter can be installed at the suction end of the air pump 92 to prevent dust and other impurities from being sucked into the air pump 92), and the heating rod 93 can heat the air inside the heated hollow plate 91. The operating temperature of the heating rod 93 is 80°C. The heated air enters each intake air hollow plate 6 through each support pipe 94. Subsequently, the air flow enters the inside of each heat-insulating wire threading square pipe 5 through each intake air round pipe 95. Due to the action of the air flow and heat, the excess oil liquid on the surface of each fiber filament starts to volatilize, and the volatilized oil gas is discharged into each outlet air hollow plate 7 from each outlet air round pipe 101 along with the air flow; After the controller 2 is started, it also controls each first infrared light-emitting lamp 104 to work. The light emitted by the first infrared light-emitting lamp 104 irradiates to the first photoresistor 103 through the inside of the outlet air round pipe 101. Since the air flow contains oil gas and the particle size of the oil gas particles is relatively large, it will obstruct the infrared rays. Therefore, when the concentration of the volatilized oil gas is higher, the light intensity irradiating to the first photoresistor 103 is lower. At this time, the electrical signal intensity fed back by the first photoresistor 103 to the controller 2 is lower. As the excess oil liquid on the surface of the fiber filament is gradually volatilized, the excess oil liquid on the surface of the fiber filament gradually decreases. Therefore, the electrical signal intensity fed back by the first photoresistor 103 to the controller 2 gradually increases. When the oil gas concentration is 25%, it indicates that the oil liquid recovery amount on the surface of the fiber filament is appropriate. At this time, the electrical signal fed back by the first photoresistor 103 to the controller 2 reaches 15 mA, and the controller 2 immediately controls the intake air electric control valve 96 and the outlet air electric control valve 102 at the corresponding position to be energized and closed to prevent excessive volatilization of the oil liquid on the surface of the fiber filament. Every time the controller 2 receives the electrical signals fed back by ten first photoresistors 103 reaching 15 mA, the controller 2 controls the output power of the air pump 92 to be reduced by one gear to avoid excessive gas flow conveyed by the air pump 92 (the air pump 92 is a variable-frequency air pump 92); The air flow discharged from each air outlet round tube 101 into the interior of the air outlet hollow plate 7 will enter the corresponding U-shaped hole 112 through the air outlet pipe 117 and the air inlet hole 116. Since the external low-temperature water liquid passes through the U-shaped condensing pipe 113, when the oil gas in the air flow encounters the low-temperature U-shaped condensing pipe 113, it will quickly condense into liquid droplets, flow down along the U-shaped condensing pipe 113 and the U-shaped hole 112 to the oil dropping hole 119, and finally flow back to the recovery tank 1 through the oil return pipe 12 to complete the recovery of the oil liquid. The air passing through the U-shaped hole 112 will enter the confluence hollow plate 13 through the air outlet hole 118 and the confluence pipe 14 and enter the interior of the machine cover 151. The controller 2 controls the second infrared lamp 154 to work, and the light emitted by the second infrared lamp 154 will irradiate to the second photosensitive resistor 155. If there is uncondensed oil gas in the discharged air flow, due to the obstruction of the infrared rays by the oil gas, the light intensity irradiating to the second photosensitive resistor 155 will become lower. At this time, the electric signal intensity fed back by the second photosensitive resistor 155 to the controller 2 is lower than 10 mA, and the controller 2 will immediately control the normally closed solenoid valve 157 and the normally open solenoid valve 153 to be energized until the electric signal fed back by the second photosensitive resistor 155 is higher than 10 mA, and the normally open solenoid valve 153 and the normally closed solenoid valve 157 are de-energized. When the normally open solenoid valve 153 and the normally closed solenoid valve 157 are energized, the air flow inside the machine cover 151 will enter the return pipe 156 and be sucked in by the air pump 92 through the suction pipe 97 to make it circulate again, ensuring that the oil gas in the tail gas is fully condensed; After the controller 2 controls the air pump 92 to work for 40 seconds (during this period, the air flow continuously output by the air pump 92 in cooperation with the heating rod 93 can ensure that all the redundant oil of the fiber filaments is fully recovered), the controller 2 controls the air pump 92, the heating rod 93, the first infrared spotlight 104, the second infrared spotlight 154, the intake electronic control valve 96, the outlet electronic control valve 102, etc. to pause working, and the controller 2 controls the two electromagnetic push rods 88 to work. The two electromagnetic push rods 88 can drive the lowermost movable pressing plate 86 to move downward. Through each connecting rod 87, each movable pressing plate 86 moves downward synchronously, so as to cooperate with the fixed pressing plate 85 to clamp and fix the fiber filaments. Subsequently, the controller 2 controls the electric push rod 82 to work regularly, and can drive the feeding plate 83 to move away from the recovery box 1. Since the fiber filaments are clamped and fixed by the movable pressing plate 86 and the fixed pressing plate 85, the fiber filaments will move synchronously, so that the fiber filaments inside each heat-insulating wire-passing square tube 5 will move outward, thereby dragging the fiber to move. In the initial stage, since there is a certain length margin for the fiber filaments between the feeding plate 83 and the subsequent stretching device, the subsequent stretching device can continuously pull the fiber filaments without being affected by the oil recovery device. After 40 seconds, this length margin is consumed by the pulling of the stretching device. By dragging the fiber filaments to move quickly through the feeding plate 83, the length margin between the feeding plate 83 and the stretching device can be replenished again, avoiding affecting the normal operation of the subsequent stretching process. After the extending action of the electric push rod 82 ends, the controller 2 controls the electromagnetic push rod 88 to cut off the power supply, and controls the electric push rod 82 to drive the feeding plate 83 to move back to the reset position. After the feeding plate 83 moves back to the reset position, the controller 2 controls the hot gas supply unit 9 and the outlet regulation unit 10, etc. to work again according to the foregoing steps, and repeats in a cycle, then the oil recovery of the fiber filaments can be continuously completed; Among them, for the components in direct contact with the oil and gas, such as the U-shaped condensate pipe 113, the oil return pipe 12, etc., their surfaces are coated with oil-repellent coatings to avoid oil solidification inside them as much as possible, which is convenient for regular cleaning and maintenance.

[0025] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A recycling device for preparing high-strength heat-resistant polyester staple fibers, comprising a recycling box (1) and a controller (2) installed on the outer side wall of the recycling box (1). Both opposite side walls of the recycling box (1) are provided with wire threading holes (3), and an oil discharge pipe (4) is inserted at the bottom of the recycling box (1). It is characterized in that, Further comprising: Multiple groups of heat-insulating wire-passing square pipes (5), which are all installed on the outer side wall of the recycling box (1) and are communicated with the corresponding wire-passing holes (3). The outer pipe walls of multiple heat-insulating wire-passing square pipes (5) in the same group are commonly fixedly installed with an air inlet hollow plate (6) and an air outlet hollow plate (7), and the air inlet hollow plate (6) and the air outlet hollow plate (7) are respectively arranged at both ends of the side wall of the heat-insulating wire-passing square pipe (5); A feeding unit (8), which is arranged on the side of each air outlet hollow plate (7) away from the air inlet hollow plate (6) and is fixedly connected to the outer side wall of the recycling box (1). The feeding unit (8) is used to drive the fiber wire to move; A hot air supply unit (9), which is installed above multiple air inlet hollow plates (6) and is used to send hot air flow into each air inlet hollow plate (6). Each heat-insulating wire-passing square pipe (5) is communicated with the corresponding air inlet hollow plate (6); Multiple air outlet regulating units (10), which are all installed inside the corresponding air outlet hollow plates (7), and each heat-insulating wire-passing square pipe (5) is communicated with the corresponding air outlet hollow plate (7); Multiple condensing units (11), which are all installed on the side wall of a group of heat-insulating wire-passing square pipes (5) on the same side, and the liquid discharging end of the condensing unit (11) and the side wall of the recycling box (1) are commonly fixedly communicated with an oil return pipe (12).

2. The recycling device for preparing high-strength heat-resistant polyester staple fibers according to claim 1, wherein, The feeding unit (8) includes two support frames (81) fixedly installed on the outer side wall of the recycling box (1), and electric push rods (82) are installed on the end faces of the two support frames (81). The telescopic ends of the two electric push rods (82) are commonly fixedly connected to a feeding plate (83). Through holes (84) coaxial with the wire-passing holes (3) are formed in the side wall of the feeding plate (83). A plurality of fixed pressing plates (85) are fixedly connected to the side wall of the feeding plate (83) close to the recycling box (1), and each fixed pressing plate (85) is arranged below a row of through holes (84) on the same side. A movable pressing plate (86) is arranged above each fixed pressing plate (85). Connecting rods (87) are commonly fixedly connected to both sides between adjacent movable pressing plates (86). Each movable pressing plate (86) is arranged above a row of through holes (84) on the same side. Electromagnetic push rods (88) are fixedly installed at both ends of the side wall of the feeding plate (83), and the telescopic ends of the two electromagnetic push rods (88) are fixedly connected to the bottom of the movable pressing plate (86) on the same side. The electric push rods (82) and the electromagnetic push rods (88) are both electrically connected to the controller (2).

3. The recycling device for preparing high-strength heat-resistant polyester staple fibers according to claim 1, characterized in that, The hot gas supply unit (9) includes a heating hollow plate (91) arranged above each intake hollow plate (6). A gas pump (92) electrically connected to the controller (2) is installed at the top of the heating hollow plate (91), and the air outlet end of the gas pump (92) is communicated with the inside of the heating hollow plate (91). A plurality of heating rods (93) are fixedly installed inside the heating hollow plate (91). A plurality of support pipes (94) are fixedly communicated between the bottom of the heating hollow plate (91) and the top of each intake hollow plate (6). A plurality of intake round pipes (95) are fixedly installed inside each intake hollow plate (6), and each heat insulation wire-passing square pipe (5) is communicated with the corresponding intake round pipe (95). An intake electric control valve (96) electrically connected to the controller (2) is installed inside each intake round pipe (95). An air suction pipe (97) is installed at the air suction end of the gas pump (92).

4. The recycling device for preparing high-strength heat-resistant polyester staple fibers according to claim 3, wherein, Each of the air outlet control units (10) includes a plurality of air outlet round pipes (101) fixedly installed inside the air outlet hollow plate (7), and each heat insulation wire-passing square pipe (5) is communicated with the corresponding air outlet round pipe (101). An air outlet electric control valve (102) is installed inside each air outlet round pipe (101). A first photosensitive resistor (103) is fixedly inserted into the pipe wall of each air outlet round pipe (101). A plurality of first infrared light-emitting lamps (104) are fixedly installed on the inner wall of the air outlet hollow plate (7), and a light-transmitting hole (105) corresponding to the position of the first infrared light-emitting lamp (104) is formed in the pipe wall of each round pipe. The light emitted by each first infrared light-emitting lamp (104) is projected onto the photosensitive surface of the first photosensitive resistor (103) through the corresponding light-transmitting hole (105). The first infrared light-emitting lamp (104) is electrically connected to the controller (2). The controller (2) controls the operation of the intake electric control valve (96) and the air outlet electric control valve (102) according to the electrical signal fed back by the first photosensitive resistor (103).

5. The recycling device for preparing high-strength heat-resistant polyester staple fibers according to claim 3, wherein, Each of the condensation units (11) includes a heat insulation plate (111) fixedly installed on the side wall of the same group of heat insulation wire-passing square pipes (5). A U-shaped hole (112) is formed inside the heat insulation plate (111), and a U-shaped condensation pipe (113) is inserted inside the U-shaped hole (112). A water liquid inlet pipe (114) and a water liquid discharge pipe (115) are respectively installed on the U-shaped condensation pipe (113), and the water liquid inlet pipe (114) and the water liquid discharge pipe (115) respectively seal the two hole ends of the U-shaped hole (112). An air inlet hole (116) is formed in the position of the hole wall of the U-shaped hole (112) close to the water liquid inlet pipe (114). An air outlet pipe (117) communicated with the air inlet hole (116) is fixedly connected to the upper side of the pipe wall of each air outlet hollow plate (7). An air outlet hole (118) is formed in the position of the hole wall of the U-shaped hole (112) close to the water liquid discharge pipe (115). An oil dropping hole (119) communicated with the oil return pipe (12) on the same side is formed at the bottom of the U-shaped hole (112).

6. The recycling device for preparing high-strength heat-resistant polyester staple fibers according to claim 5, characterized in that, A busbar hollow plate (13) is commonly installed on the tops of multiple heat insulation plates (111). The busbar hollow plate (13) is fixedly connected to multiple busbar pipes (14), and each busbar pipe (14) is connected to a corresponding air outlet hole (118). A monitoring and exhaust assembly (15) is installed on the top of the busbar hollow plate (13).

7. The recycling device for preparing high-strength heat-resistant polyester staple fibers according to claim 6, characterized in that, The monitoring and exhaust assembly (15) includes a machine cover (151) fixedly inserted into the top of the busbar hollow plate (13). An exhaust pipe (152) is fixedly inserted into the top of the machine cover (151). A normally open solenoid valve (153) is installed inside the exhaust pipe (152). A second infrared light emitter (154) and a second photosensitive resistor (155) are arranged inside the machine cover (151), and the second infrared light emitter (154) and the second photosensitive resistor (155) are respectively installed on the inner walls of two opposite sides of the machine cover (151). A return pipe (156) is fixedly inserted into the side wall of the machine cover (151) at a position above the second infrared light emitter (154), and a normally closed solenoid valve (157) is installed inside the return pipe (156). The return pipe (156) is connected to the inside of the air suction pipe (97).

8. A recycling method for preparing high-strength heat-resistant polyester staple fibers and a recycling device for preparing high-strength heat-resistant polyester staple fibers as described in claim 1, characterized in that, The recycling method includes the following steps: S1. Pass the polyester staple fiber passing through the oiling equipment through the corresponding wire threading holes (3), heat insulation wire threading square pipes (5) and feeding unit (8), connect the polyester staple fiber to the subsequent stretching equipment, and leave a certain length margin between the feeding unit (8) and the subsequent stretching equipment. Then, connect the liquid inlet end and the liquid outlet end of the condensing unit (11) to the external water liquid pumping pipeline; S2. Start the controller (2), and the controller (2) will control the hot gas supply unit (9) and each air outlet regulating unit (10) to work; S3. Every 40 seconds, the controller (2) controls the hot gas supply unit (9) and the air outlet regulating unit (10) to pause working, and controls the feeding unit (8) to work once; S4. After the feeding unit (8) finishes working, the controller (2) controls the hot gas supply unit (9) and the air outlet regulating unit (10) to resume working, and repeats steps S3 and S4; S5. Regularly clean and maintain the inside of the condensing unit (11), recycling box (1), oil drain pipe (4) and oil return pipe (12).

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