CN107813444B

CN107813444B - System and method for producing rubber powder at normal temperature by using waste tires

Info

Publication number: CN107813444B
Application number: CN201711123481.5A
Authority: CN
Inventors: 张涛; 刘晓龙; 张飞
Original assignee: Hebei Zengli Rubber Technology Co ltd
Current assignee: Hebei Zengli Rubber Technology Co ltd
Priority date: 2017-11-14
Filing date: 2017-11-14
Publication date: 2020-09-04
Anticipated expiration: 2037-11-14
Also published as: CN107813444A

Abstract

The invention relates to a system and a method for producing rubber powder at normal temperature by using waste tires, wherein the system comprises a ring cutting machine, a shredder, a butterfly separator, a plurality of rubber breakers and auxiliary machines thereof, a magnetic separator, a fiber separator, a rubber powder bin and a rubber powder grading device which are sequentially connected according to the material conveying direction. The invention thoroughly solves the problems of high energy consumption, serious dust pollution and multiple safety accidents in the process of producing rubber powder by using waste tires, realizes the automatic operation of crushing, rubber breaking, middle crushing and fine grinding of the whole machine, is energy-saving and environment-friendly, greatly reduces the labor consumption and the labor intensity, and has good quality of the obtained rubber powder.

Description

System and method for producing rubber powder at normal temperature by using waste tires

Technical Field

The invention relates to a system and a method for producing rubber powder, in particular to a system and a method for producing rubber powder by using waste tires at normal temperature.

Background

With the improvement of the quality of life of people, automobiles enter thousands of households, and the problem of treatment of a large amount of waste tires is solved. The quantity of waste tires in China is increased rapidly at a speed of about 6500 ten thousand tires per year, and the recovery rate is only about 30 percent. The annual consumption of Chinese rubber is at the first of the world, and 60 percent of the consumption is imported. Under the condition that rubber resources are gradually lacking, the recycling of waste tires has important social significance and economic significance.

At present, two methods for producing rubber powder by using waste tires are mainly used, namely a normal-temperature rolling shearing method and a low-temperature crushing method. The cryogenic grinding method uses liquid nitrogen as a coolant, so that rubber is embrittled after being cooled at ultralow temperature and then ground, and the liquid nitrogen is expensive and high in production cost, so that the cryogenic grinding method cannot be popularized. The normal-temperature rolling shearing method is a relatively common production method, the former procedure, namely the tire crushing, adopts three small pieces (namely a ring cutting machine, a slitter and a dicer) for processing, the intermediate procedure, namely the rubber powder production, adopts rubber breaking equipment for breaking rubber of rubber blocks, and adopts a pulverizer for subsequent fine processing. In the rubber breaking process, the tire rubber block is repeatedly subjected to the actions of extrusion, friction, tearing and the like from a rubber breaker roller, a large amount of heat energy is generated in the decomposition process, the rubber powder is burnt due to overhigh temperature, and the quality of the rubber powder is influenced, so that the quality of the rubber powder produced by a normal-temperature rolling shearing method is poor, and the application limitation is large. In addition, the whole production process has high energy consumption, high noise, serious dust scattering and easy occurrence of fire and other safety accidents. The above problems have long been a bottleneck to inhibit the development of the industry.

Disclosure of Invention

The invention aims to provide a system for producing rubber powder at normal temperature by utilizing waste tires, which solves the problems of poor quality of the rubber powder, high energy consumption, high noise, serious dust scattering, easy occurrence of fire and other safety accidents in the production process of the conventional production system.

The second purpose of the invention is to provide a method for producing rubber powder by using waste tires at normal temperature, so as to improve the quality of the rubber powder, reduce dust pollution and improve the production safety.

One of the objects of the invention is achieved by: a system for producing rubber powder at normal temperature by using waste tires comprises a ring cutting machine, a shredder, a butterfly separator, a plurality of rubber breakers and auxiliary machines thereof, a magnetic separator, a fiber separator, a rubber powder bin and a rubber powder grading device which are sequentially connected according to the material conveying direction;

the shredder comprises a rack, and a shredding bin, a driving mechanism, a spraying control device and a hydraulic pressing plate mechanism which are arranged on the rack; the pair of rollers are arranged inside the tearing bin and connected with the driving mechanism; the spraying control device comprises a plurality of atomizing nozzles arranged in the shredding bin, a water tank and a spraying water pump which are used for providing water sources for the atomizing nozzles, a photoelectric sensor arranged at a feed inlet of the shredding bin and a spraying controller used for controlling the spraying water pump; the hydraulic pressure plate pressing mechanism comprises a hydraulic cylinder arranged on the shredding bin and a pressure plate hinged to the tail end of a piston rod of the hydraulic cylinder, and the pressure plate can extend into the shredding bin through a feed back port under the driving of the hydraulic cylinder;

the rubber crusher and the auxiliary machine thereof comprise a rubber crusher, an output belt conveyor arranged below a discharge port at the bottom of the rubber crusher, a vibration classifying screen arranged at the discharge end of the output belt conveyor, a material collecting bin connected with a lower layer discharge port of the vibration classifying screen and a material returning belt conveyor with a feed end connected with an upper layer discharge port of the vibration classifying screen, wherein the discharge end of the material returning belt conveyor is connected with a feed port of the rubber crusher; the rubber crusher is provided with a first temperature sensor and a first spray head, the first spray head is connected with a first spray water pump, the first temperature sensor is electrically connected with the input end of a first spray controller, and the output end of the first spray controller is electrically connected with a driver of the first spray water pump.

The two shredders are respectively a first shredder and a second shredder, the first shredder is connected with the tire conveying track, a feed inlet of the second shredder is connected with a discharge outlet of the first shredder, a discharge outlet of the second shredder is connected with a feed inlet of the butterfly separator, and an unqualified rubber powder outlet of the butterfly separator is connected with a feed back port of the first shredder through a feed back track; after the tire enters the primary shredding of the first shredder, the tire enters the second shredder to be shredded for the second time, the obtained rubber block enters the butterfly sorting machine, the rubber block with the qualified size enters the rubber block storage bin to be broken, and the rubber block with the unqualified size returns to the first shredder.

The rubber crusher is provided with a feeding device, and the feeding device comprises a rubber block bin, a feeding port arranged at the top of the rubber block bin, a vibration feeder arranged at the bottom of the rubber block bin, a feeding belt conveyor used for feeding materials into the rubber crusher and a vibration controller used for controlling the vibration feeder to work intermittently; the feeding end of the feeding belt conveyor is positioned below the discharge hole of the vibration feeder, and the discharge end of the feeding belt conveyor is connected with the feed hole of the rubber crusher;

the distribution and conveying of rubber blocks are realized among rubber block bins matched with each rubber crusher through a distribution conveyor, the distribution conveyor is characterized in that a front belt conveyor and a rear belt conveyor are arranged at the top of each rubber block bin, two openable valve plates are arranged at the discharge end of the front belt conveyor, one valve plate is positioned above a feed port of each rubber block bin, and the other valve plate is positioned above the feed end of the rear belt conveyor; the feeding end of a front belt conveyor of a rubber block bin corresponding to the first rubber crusher is connected with the discharging end of the butterfly separator.

The invention also comprises a centrifugal screen for secondarily screening the rubber powder and a flour mill for finely grinding the rubber powder. The rubber powder of different grades selected by the rubber powder grading device enters a centrifugal screen for centrifugal screening, the qualified rubber powder is directly packed, the unqualified rubber powder enters a flour mill for milling, and then is screened by the centrifugal screen, and the process is circulated.

The discharge end of output belt feeder is provided with the tripper, the tripper includes two conveyer belts and sets up the dam board between two conveyer belts, and the pay-off direction of two conveyer belts is carried on the back mutually, all is provided with vibrations classifying screen at the unloading end of two conveyer belts.

The rubber crusher comprises a rubber crushing bin, a pair roller arranged in the rubber crushing bin and a driver used for driving the pair roller, wherein a dust collection cover is arranged at the top of the rubber crushing bin and at the feeding end and the discharging end of the vibration classifying screen, the dust collection cover is connected with an air inlet of the dust remover through an air guide pipeline, a second temperature sensor and a second spray head are arranged in the air guide pipeline, the second spray head is connected with a second spray water pump, the second temperature sensor is electrically connected with the input end of the second spray controller, and the output end of the second spray controller is electrically connected with the driver of the second spray water pump.

The second purpose of the invention is realized by the method for producing the rubber powder by using the waste tires at normal temperature, which comprises the following steps:

a. placing the tire into a ring cutting machine, moving a cutter to cut off tire beads on two sides of the tire, collecting the tire beads in a centralized manner, and conveying the tire with the tire beads cut off into a shredding bin of a shredder through a tire conveying track;

b. after the tire with the tire bead cut off enters a shredding bin, a hydraulic cylinder drives a pressure plate to extend into the shredding bin to press the tire, a photoelectric sensor detects a signal and transmits the signal to a spray controller, the spray controller controls a water pump to work, an atomizing nozzle starts to spray into the bin, meanwhile, a roller rotates to cut the tire, the tire is cut into rubber blocks, the obtained rubber blocks enter a butterfly separator to be screened, the rubber blocks with qualified sizes enter a rubber block bin to be broken, and the rubber blocks with unqualified sizes return to the shredding bin to be shredded again;

c. the rubber blocks are fed into a rubber crusher through a feeding device, are decomposed into rubber powder under the action of friction and extrusion of a pair of rollers, the rubber powder falls onto a conveying belt conveyor through a discharge port at the bottom of the rubber crusher, is conveyed to a vibration grading sieve through an output belt, is graded under the action of vibration screening of the vibration grading sieve, the rubber powder with the particle size smaller than the mesh of a screen mesh of the vibration grading sieve enters a lower-layer slideway through the screen mesh and falls into a material collecting bin, and the rubber powder with the particle size larger than the mesh of the screen mesh of the vibration grading sieve is left above the screen mesh and is returned into the rubber crusher through a material returning belt; in the process, the first temperature sensor monitors the rubber powder temperature in real time, when the measured temperature is greater than a set value, the first spray header starts to spray water to the rubber powder, and when the temperature drops below the set value, the water spraying is stopped;

d. rubber powder in the material collecting bin is subjected to steel wire removal by a magnetic separator, enters a fiber separator to remove fibers, and the rubber powder after the fibers are removed is sent to a rubber powder bin;

e. the vibration discharger at the bottom of the rubber powder bin works intermittently according to set time, and rubber powder in the rubber powder bin is discharged to the rubber powder grading device, so that grading of the rubber powder is realized.

The feeding device in the step c comprises a rubber block bin, a feeding port arranged at the top of the rubber block bin, a vibration feeder arranged at the bottom of the rubber block bin, a feeding belt conveyor used for feeding materials into the rubber crusher and a vibration controller used for controlling the vibration feeder to work intermittently; the feeding end of the feeding belt conveyor is positioned below the discharge hole of the vibration feeder, and the discharge end of the feeding belt conveyor is connected with the feed hole of the rubber crusher; the vibration feeder works intermittently according to set time, rubber blocks in the rubber block storage bin are discharged onto the feeding belt conveyor, and the feeding belt conveyor works to convey the rubber blocks into the rubber crusher.

The distribution and conveying of rubber blocks are realized among rubber block bins matched with each rubber crusher through a distribution conveyor, the distribution conveyor is characterized in that a front belt conveyor and a rear belt conveyor are arranged at the top of each rubber block bin, two openable valve plates are arranged at the discharge end of the front belt conveyor, one valve plate is positioned above a feed port of each rubber block bin, and the other valve plate is positioned above the feed end of the rear belt conveyor; the feeding end of a front belt conveyor of a rubber block bin matched with the first rubber crusher is connected with the discharging end of the butterfly separator;

qualified rubber blocks from the butterfly separator are conveyed outwards through a front belt conveyor of a rubber block bin corresponding to a first rubber crusher, a valve plate corresponding to a feeding port of the rubber block bin is opened, a valve plate corresponding to a rear belt conveyor is closed, the rubber blocks fall into the rubber block bin, when the rubber blocks are fed into a rubber block bin of a second rubber crusher, the valve plate corresponding to the rear belt conveyor is opened, another valve plate is closed, the rubber blocks are conveyed backwards through the rear belt conveyor, and the like, so that feeding of the rubber block bins is realized.

In the step c, the rubber crusher comprises a rubber crushing bin, a pair roller arranged in the rubber crushing bin and a driver used for driving the pair roller, wherein dust hoods are arranged at the top of the rubber crushing bin and at the feeding end and the discharging end of the vibration classifying screen and are connected with an air inlet of the dust remover through an air guide pipeline, a second temperature sensor and a second spray head are arranged in the air guide pipeline, the second spray head is connected with a second spray water pump, the second temperature sensor is electrically connected with the input end of a second spray controller, and the output end of the second spray controller is electrically connected with the driver of the second spray water pump;

the second temperature sensor monitors the internal temperature of the induced draft pipeline in real time, when the measured temperature is greater than a set value, the second spray header starts spraying water, and when the temperature drops below the set value, the spraying water is stopped.

And e, allowing the rubber powder of different grades separated by the rubber powder grading device to enter a centrifugal screen for centrifugal screening, directly packaging the qualified rubber powder, allowing the unqualified rubber powder to enter a flour mill for milling, screening by the centrifugal screen, and circulating the steps.

The invention has the advantages of ingenious design, high automation degree, great reduction of labor consumption and labor intensity, production and operation cost saving, energy saving, environmental protection, low energy consumption, environmental friendliness, convenient maintenance and suitability for popularization and application, and can effectively and closely link each link of crushing waste tires into powder. The method has high automation degree, good rubber discharge temperature and good rubber powder quality, various indexes of the obtained rubber powder are shown in the table, and the data in the table show that the rubber powder produced by the method has quality far exceeding the national standard.

The invention solves the problems of dust generated in the process of shredding tires, such as scattering everywhere and low safety, has simple structure, greatly reduces equipment cost and operation cost, and compared with a negative pressure pulse dust collector, the cost of a set of negative pressure pulse dust collector is more than several ten thousand yuan. The invention has high automation degree, avoids dust flying, does not generate muddy water to be discharged from the equipment, saves electric energy and avoids secondary pollution and waste.

The invention can effectively solve the problem of overhigh temperature of colloidal particles and colloidal blocks caused by a large amount of heat generated by the colloidal blocks in the running process of the rubber crusher and the auxiliary machine, effectively reduce the risk of spontaneous combustion and inhibit the dust diffusion generated in the production process. Compared with the natural cooling and air cooling technology in the existing rubber powder breaking equipment, the invention can reduce the temperature of materials to the maximum extent, reduce the configuration power of dust removing equipment to the maximum extent, and realize the production process of rubber powder breaking link with environmental protection, energy saving, high efficiency and zero spontaneous combustion risk.

The system disclosed by the invention is ingenious in design and compact in structure, the belt conveyor passes through the top of the rubber block storage bin, the occupied space of equipment is saved, the connecting structure between the belt conveyors is optimized, the setting length of the conveying belt is shortened, the equipment cost is saved, the equipment layout in a workshop is reasonable, and the safety production is facilitated. The vibration feeder works intermittently, so that the rubber blocks in the rubber crusher meet the production requirement, the problems of material blockage, material overflow and the like caused by excessive rubber blocks are avoided, a specially-assigned person is not needed to take care of the rubber blocks, and the labor is saved.

Drawings

FIG. 1 is a schematic flow diagram of the present invention.

FIG. 2 is a schematic view of the shredder.

FIG. 3 is a schematic diagram of the shredder construction.

Fig. 4 is a schematic structural diagram of the rubber crusher and its auxiliary machinery.

FIG. 5 is a schematic view of the structure of the distributor.

Fig. 6 is a schematic view of the structure of the charging device.

Fig. 7 is a schematic view of the structure of the distribution conveyor.

Fig. 8 is a schematic view of the structure of the vibration feeder.

In the figure: 1. frame, 2, shredding bin, 3, driving mechanism, 4, frame platform, 5, roller, 6, tire conveying track, 7, feed back track, 8, discharge gate, 9, atomizing nozzle, 10, water tank, 11, atomizing water pump, 12, photoelectric sensor, 13, pressing plate, 14, piston rod, 15, rubber crusher, 16, rubber crushing bin, 17, double roller, 18, output belt conveyor, 19, conveying belt, 20, dam plate, 21, vibration grading screen, 22, screen, 23, material returning belt conveyor, 24, skirt, 25, cover plate, 26, dust hood, 27, rubber block bin, 28, front belt conveyor, 29, rear belt conveyor, 30, first valve plate, 31, second valve plate, 32, vibration feeder, 33, hopper, 34, support, 35, vibration motor, 36, buffer spring, 37, feeding, 38, butterfly sorting machine, 39, feeding belt machine, 40, And a feeding port.

Detailed Description

Example 1: a system for producing rubber powder by using waste tires at normal temperature.

The invention mainly comprises a ring cutting machine, a shredder, a butterfly separator 38, a rubber crusher and auxiliary machines thereof, a magnetic separator, a fiber separator, a rubber powder bin, a rubber powder grading device, a centrifugal sieve, a flour mill and the like.

The ring cutting machine is used for cutting off the tire beads on two sides of the tire, the tire beads are separately processed, the phenomenon that ring opening rubber with poor quality is mixed into tire rubber powder is avoided, and the tire with the cut-off tire beads is conveyed to the shredder through the tire conveying rail 6.

The shredder is used for tearing the tire with the tire bead cut off into a rubber block of about 5cm multiplied by 8cm for rubber breaking, and as shown in fig. 2 and 3, the shredder comprises a frame 1, a shredding bin 2, a driving mechanism 3, a hydraulic pressure plate pressing mechanism and a spraying control device.

Tear garrulous 2 places as tearing up the tire in the storehouse body, be provided with a pair of roll 5 in the inside in the storehouse body, roll 5 is connected with the 3 transmissions of actuating mechanism including changeing the roller and setting up the cutter on changeing the roller, and actuating mechanism 3 sets up on rack platform 4, and two 5 relative rotations of roll for cut the breakage to the tire. Be equipped with the feed inlet on a lateral wall in the storehouse body, the feed inlet is connected with tire transfer orbit 6, is equipped with the feed back mouth on another lateral wall in the storehouse body, and the feed back mouth links to each other with feed back track 7, is equipped with bin outlet 8 in the bottom in the storehouse body, and feed inlet and feed back mouth are located the top of frame platform 4, and bin outlet 8 is located the below of frame platform 4.

Hydraulic pressure clamp plate mechanism includes pneumatic cylinder and clamp plate 13, and clamp plate 13 is "7" type, including backup pad and gland board, the bottom of backup pad articulates on the external wall in storehouse of feed back below, and the gland board passes the feed back mouth that tears garrulous 2 storehouse and gets into the storehouse body in, and the pneumatic cylinder setting is on the external wall in storehouse of backup pad top, and the end of the piston rod 14 of pneumatic cylinder articulates in the backup pad, and the reciprocating motion of piston rod 14 drives the backup pad and rotates around its articulated shaft, and then drives the feed back mouth that the gland board business turn over shredder. After the tire enters the shredding bin 2, the hydraulic cylinder acts, the piston rod 14 retracts, and the supporting plate is pulled to rotate towards the direction close to the bin body, so that the gland plate enters the bin body through the feed back port of the shredding bin 2 to press the tire, the tire forms block-shaped rubber blocks under the cutting and crushing action of the roller 5, and the rubber blocks are discharged from the discharge port 8; after the shredding operation is finished, the hydraulic cylinder acts again, the piston rod 14 extends outwards to push the supporting plate to rotate in the direction away from the bin body, and therefore the gland plate is pulled out from the bin body.

As shown in fig. 3, the spraying control device comprises a plurality of atomizing nozzles 9, a water tank 10, a spraying water pump 11, a photoelectric sensor 12 and a spraying controller, the atomizing nozzles 9 are arranged in the shredding bin 2, each atomizing nozzle 9 is connected with the water tank 10 through a water supply pipeline, and the spraying water pump 11 is arranged on the water supply pipeline. Photoelectric sensor 12 sets up in the feed inlet department of shredding storehouse 2, and the input and the photoelectric sensor 12 electricity of spraying controller are connected, and the output and the spraying water pump 11 electricity of spraying controller are connected. After photoelectric sensor 12 detected the feeding signal, give the spray controller with the signal transmission, spray controller control spraying water pump 11 opens, and water in the water tank 10 gets into atomizer 9, forms the water smoke, and the dust that the water smoke will tear in the storehouse 2 and tear the tire in-process production subsides, avoids the dust to fly upward and the polluted environment, and the water smoke subsides the back with the dust and mixes with the gluey piece in the storehouse, reduces gluey piece temperature, avoids the emergence of burning explosion accident. The spray controller may be electrically connected to the hydraulic cylinder, and the operation of the hydraulic cylinder may be controlled by the spray controller.

Because the production of dust is directly proportional with the time of tearing up of tire in the feed bin, in order to further improve dust settlement efficiency and avoid producing muddy water, connect the converter at the output of spraying controller, by opening and close and the speed of converter control spraying water pump 11, the input of converter is connected with spraying controller's output electricity, the output of converter is connected with spraying water pump 11's motor electricity. The converter is according to the time that the tire got into the shredder feed bin, and the speed of automatically regulated spraying water pump 11, and then realizes the change of spraying size, and along with the increase of the time that the tire got into the shredder feed bin, the speed of spraying water pump 11 accelerates, when reaching and setting for after the shredding time (tear promptly and accomplish the back), converter control spraying water pump 11 closes, and the spraying stops.

The shredder is provided with two, is first shredder and second shredder respectively, and the feed inlet of first shredder links to each other with tire transfer track 6, and the feed inlet of second shredder passes through transfer rail with the discharge gate of first shredder to be connected, and the discharge gate of second shredder links to each other with the feed inlet of butterfly selection machine 38, and the unqualified material export of butterfly selection machine 38 passes through feed back track 7 and links to each other with the feed back mouth of first shredder. After the tire enters the first shredder for primary shredding, the tire enters the second shredder for secondary shredding, the obtained rubber block enters the butterfly sorting machine 38, the rubber block with qualified size enters the rubber block storage bin 27 for rubber breaking, and the rubber block with unqualified size returns to the first shredder.

The butterfly separator 38 is used for separating the rubber blocks, separating the rubber blocks with the size not larger than 5cm multiplied by 8cm, sending the rubber blocks to the rubber crusher through the feeding belt conveyor 39 for rubber crushing, and returning the rubber blocks with the size larger than 5cm multiplied by 8cm to the shredder for shredding again.

As shown in fig. 4 and 5, the rubber crusher and its auxiliary machines include a rubber crusher 15, an output belt conveyor 18, a distributor, a vibrating classifying screen 21, a material returning belt conveyor 23, etc. for crushing rubber blocks of qualified size sorted by a butterfly sorting machine 38 to generate rubber powder.

The rubber crusher 15 comprises a rubber crushing bin 16, a pair roller 17 arranged inside the rubber crushing bin 16 and a driver for driving the pair roller 17, wherein a feeding port is arranged at the top of the rubber crushing bin 16, and is connected with a bottom discharging port of a rubber block bin 27 through a feeding belt conveyor 37 and used for feeding rubber blocks into the rubber crushing bin 16. The bottom of the rubber breaking bin 16 is provided with a discharge hole for discharging rubber powder obtained by extrusion and friction of a pair of rollers 17.

The output belt conveyor 18 is arranged below the discharge hole of the rubber crushing bin 16 and used for conveying rubber powder out, and comprises an output belt and a driver. The distributor is arranged at the discharge end of the output belt and comprises two conveyor belts 19 and a dam plate 20 arranged between the two conveyor belts 19, the transmission directions of the two conveyor belts 19 are reversely transmitted by taking the dam plate 20 as a boundary, namely, one end of the conveyor belt 19 far away from the dam plate 20 is the discharge end. The end face of the dam plate 20 is triangular, and the top edge of the dam plate 20 is located below the discharge end of the output belt, so that rubber powder falling from the output belt is divided into two parts, and the subsequent vibration screening efficiency is improved.

The discharging end of each conveyor belt 19 is respectively provided with a vibration grading sieve 21, each vibration grading sieve 21 comprises a slide way, a screen 22 and a vibration device, the screen 22 is arranged on the slide way and divides the slide way into an upper layer and a lower layer, the discharging port of the lower layer is connected with the material collecting bin, and the discharging port of the upper layer is connected with the bottom end (the feeding end) of the material returning belt conveyor 23. After the rubber powder enters the vibration grading sieve 21, the rubber particles with the particle size smaller than the meshes of the screen 22 fall onto a bottom plate of the slideway through the screen 22 and slide down into a material collecting bin under the combined action of vibration and gravity; the colloidal particles with the particle size larger than the meshes of the screen 22 are left above the screen 22 and slide down to the material returning belt conveyor 23 under the combined action of vibration and gravity.

The material returning belt conveyor 23 comprises a material returning belt and a driving device which are obliquely arranged, and the top end (discharge end) of the material returning belt is connected with the feed inlet of the rubber crushing bin 16 and used for returning colloidal particles with larger particle sizes to the rubber crusher 15 for secondary rubber crushing. The discharge end of the material returning belt conveyor 23 is located right above the output belt conveyor 18, a PVC (polyvinyl chloride) shielding curtain is arranged between the material returning belt conveyor 23 and the output belt conveyor 18, dust can be effectively prevented from leaking, and when colloidal particles on the output belt need to be observed, the shielding curtain is lifted. The skirt edges 24 are arranged on the two sides of the material returning belt respectively to reduce the falling of colloidal particles or rubber blocks in the conveying process, avoid the abrasion and deviation of the belt caused by the fact that steel wires are pricked into the two sides of the belt, reduce the blanking around a machine, prolong the service life of the belt and reduce the replacement frequency of the belt and a conveying shaft. And cover plates 25 are respectively arranged at the top end and the bottom end of the material returning belt and used for preventing unloading and dust raising.

The inside of broken rubber storehouse 16 is provided with first temperature sensor and first shower head, and first temperature sensor is connected with spray controller's input electricity, and first shower head passes through water supply pipe and links to each other with water tank 10, is provided with spray pump on water supply pipe, and spray pump is equipped with the frequency conversion driver, and the frequency conversion driver is connected with spray controller's output electricity. When the temperature measured by the first temperature sensor is higher than a set value (70 ℃), a signal is sent to the spraying controller, the spraying controller sends a driving signal to the variable-frequency driver after receiving the temperature signal, and according to the set value, the working frequency of the variable-frequency driver is adjusted, the rotating speed of the spraying water pump is controlled, so that the spraying flow is adjusted, and the reasonable control of the material temperature is finally realized.

And the positions of the rubber breaking bin 16, the feed end of the distributor, the feed returning belt and the like are respectively provided with a dust hood 26 for collecting generated dust, and the dust hood 26 is connected with an air inlet of the dust remover through an air inducing pipeline. And a second temperature sensor and a second spray header are arranged in the induced air pipeline, and the spraying and control principles of the second temperature sensor and the second spray header are the same as those of the first temperature sensor and the first spray header, so that the details are not repeated.

Since the rubber crushing speed of the rubber crusher 15 is lower than the shredding speed of the shredder, in order to improve the production efficiency, a plurality of sets of rubber crushers and their auxiliary machines are generally provided. Each rubber crusher 15 is provided with a feeding device, as shown in fig. 6, the feeding device comprises a rubber block bin 27, a vibration feeder 32, a feeding belt conveyor 37 and a vibration controller. The rubber block storage bin 27 is used for storing rubber blocks with qualified sizes which are shredded by the shredder and sorted by the butterfly sorting machine 38, and the upper bin body is columnar and the lower bin body is inverted conical. A feeding port 40 is arranged at the top of the bin body, a discharging port is arranged at the bottom of the bin body, and the vibration feeder 32 is arranged at the discharging port. As shown in fig. 8, the vibration feeder 32 includes a support 34, a hopper 33, a buffer spring 36 and a vibration motor 35, the hopper 33 is disposed at a discharge port of the bin, the support 34 is disposed below the hopper 33 to support the hopper 33, the buffer spring 36 is disposed between a bottom surface of the hopper 33 and a top surface of the support 34 to buffer vibration transmitted toward the support 34, and the vibration motor 35 is disposed on an outer sidewall of the hopper 33.

The vibration controller is used for controlling the intermittent operation of the vibration motor 35, and two delay circuits are arranged in the vibration controller, one delay circuit is used for controlling the feeding time (namely single vibration time) of the vibration motor 35, and the other delay circuit is used for controlling the feeding interval time (namely interval time between two vibrations) of the vibration motor 35. The rubber blocks with qualified sizes are stored in the rubber block storage bin 27, and the feeding time and the feeding interval time are set according to the actual production requirements, so that the rubber blocks in the rubber crusher 15 are ensured to meet the production requirements, and the problems of material blockage, material overflow and the like caused by excessive rubber blocks are avoided.

The feeding belt conveyor 37 is used for conveying the rubber blocks into the rubber crusher 15, the bottom end (i.e. the feeding end) of the feeding belt conveyor is located below the discharge hole of the vibration feeder 32, and the top end (i.e. the discharge end) of the feeding belt conveyor is connected with the feed hole of the rubber crusher 15. The feeding belt conveyor 37 is provided with a sensor, when the rubber blocks are detected to fall on the belt, a matched motor is started to drive the feeding belt conveyor 37 to work, the rubber blocks are sent into the rubber crusher 15, and when no rubber blocks fall on the belt conveyor, the matched motor is closed, and the belt conveyor stops working.

The distribution and conveying of rubber blocks are realized between the rubber block bins 27 matched with each rubber crusher 15 through a distribution conveyor, as shown in fig. 7, the distribution conveyor is that a front belt conveyor 28 and a rear belt conveyor 29 are arranged at the top of the rubber block bins 27, two openable valve plates are arranged at the discharge end of the front belt conveyor 28, the valve plates are hinged on the side wall of the guide rail at the discharge end of the front belt conveyor 28, the width of the two valve plates is equal to the belt width of the front belt conveyor 28 and are respectively called as a first valve plate 30 and a second valve plate 31, wherein the first valve plate 30 is positioned above the feeding port 40 of the rubber block bin 27, and the second valve plate 31 is positioned above the feeding end of the rear belt conveyor 29. When two valve plates are closed, the discharge end of the front belt conveyor 28 is blocked, when the first valve plate 30 is opened and the second valve plate 31 is closed, the rubber block falls into the current rubber block storage bin 27, when the first valve plate 30 is closed and the second valve plate 31 is opened, the rubber block falls onto the rear belt conveyor 29 and is conveyed to the next rubber block storage bin 27. The feed end of the front belt conveyor 28 of the rubber block storage bin 27 matched with the first rubber crusher 15 is connected with the discharge end of the butterfly separator 38, and the rear belt conveyor 29 of the rubber block storage bin 27 matched with the last rubber crusher 15 is not required to be arranged. Between two adjacent rubber block bins 27, the rear belt conveyor 29 of the previous rubber block bin and the front belt conveyor 28 of the next rubber block bin are connected seamlessly, or the same belt conveyor can be used.

The magnetic separator is used for carrying out magnetic separation on the rubber powder in the aggregate bin and removing steel wires; the fiber separator is used for removing fibers in the rubber powder. The rubber powder without steel wires and fibers is sent to a rubber powder bin by a bucket elevator for storage, and according to different purposes, a rubber powder grading device is used for grading the rubber powder to separate out rubber powder with different meshes. Part of the rubber powder is directly conveyed to a packaging machine through wind power for packaging; and the rest rubber powder enters a centrifugal screen through a spiral conveying device, after centrifugal screening, the qualified rubber powder is packed, the unqualified rubber powder enters a flour mill for milling, the milled rubber powder enters the centrifugal screen again for screening, and the process is repeated.

Example 2: a method for producing rubber powder by using waste tires at normal temperature.

The method for producing the rubber powder at normal temperature by using the waste tires comprises the following steps:

1) a set of system for producing rubber powder by using waste tires at normal temperature in the embodiment 1 is arranged, and in an initial state, a pressure plate 13 of a shredder is arranged outside a shredding bin 2.

2) Put into the cutting ring machine with the tire, remove the cutter, cut the tire bead of tire both sides, can directly sell after the tire bead is collected, also can directly sell through rolling a mouthful steel wire and a mouthful rubber of circle of processing production, the steel wire of circle mouthful can directly be sold, and the mouthful rubber of circle can reuse, broken rubber crocus.

3) The tire with the bead cut off is fed into the tire transfer rail 6, and after weighing is completed on the tire transfer rail 6, the tire enters the shredding bin 2 of the shredder.

4) After the tire enters the shredding bin 2, the photoelectric sensor 12 detects a tire signal and transmits the signal to the controller, the controller controls the hydraulic cylinder to act, the piston rod 14 retracts, the supporting plate is pulled to rotate towards the direction close to the bin body, thereby the gland plate enters the bin body through the feed back port of the shredding bin to press the tire, at the same time, the spraying water pump 11 starts to work, the atomizing spray head 9 starts to spray into the bin, the roller 5 starts to rotate at the same time to cut the tire, when the set time is reached, the spray water pump 11 and the driving mechanism 3 stop working, the piston rod 14 of the hydraulic cylinder extends outwards, the gland plate is drawn out from the bin body to prepare for cutting the next tire, the obtained rubber blocks are discharged through the discharge hole 8 at the bottom of the shredding bin 2 and enter the butterfly separator 38, screening is carried out, the rubber blocks with qualified sizes enter the rubber block storage bin 27 for rubber breaking, and the rubber blocks with unqualified sizes are returned to the shredding bin 2 through the material returning track 7 for shredding again.

Qualified rubber blocks from the butterfly separator 38 are conveyed outwards by the front belt conveyor 28 of the rubber block bin corresponding to the first rubber crusher 15, the valve plate corresponding to the rubber block bin feeding port 40 is opened, the valve plate corresponding to the rear belt conveyor 29 is closed, the rubber blocks fall into the rubber block bin, when the rubber blocks need to be fed into the rubber block bin of the second rubber crusher 15, the valve plate corresponding to the rear belt conveyor 29 is opened, the other valve plate is closed, the rubber blocks are conveyed backwards by the rear belt conveyor 29, and so on, so that the feeding of the rubber block bins 27 of the rubber crushers 15 is realized.

5) The vibration controller controls the vibration motor 35 to work intermittently according to the set feeding time and the feeding interval time, the rubber blocks in the rubber block storage bin 27 are discharged onto the feeding belt conveyor 37, and the feeding belt conveyor 37 works to convey the rubber blocks into the rubber breaking bin 16 of the rubber breaking machine 15;

6) after the rubber blocks enter the rubber breaking bin 16, the pair rollers 17 start to rotate to extrude and rub the rubber blocks to decompose the rubber blocks into rubber powder, the rubber powder falls onto a conveying belt conveyor through a discharge port at the bottom of the rubber breaker 15 and is divided into two parts at a distributor, the two parts of rubber powder respectively enter corresponding vibration grading sieves 21 to be screened and graded, the rubber powder with small particle size enters a lower layer slideway through a screen 22 of the vibration grading sieves 21 and falls into a material collecting bin, the rubber powder with large particle size is left above the screen 22 and is sent back into the rubber breaker 15 through a material returning belt conveyor 23 to continue rubber breaking; in the process, the first temperature sensor monitors the rubber powder temperature in real time, when the measured temperature is greater than a set value (70 ℃), the first spray header starts to spray water to the rubber powder, and when the temperature drops below the set value, the water spraying is stopped.

7) The rubber powder in the collecting bin is subjected to steel wire removal by a magnetic separator, enters a fiber separator for fiber removal, and the rubber powder after fiber removal is lifted to a rubber powder bin by a bucket elevator.

8) The vibration discharger at the bottom of the rubber powder bin works intermittently according to set time, and rubber powder in the rubber powder bin is discharged to the rubber powder grading device, so that grading of the rubber powder is realized. And (3) directly packaging part of the rubber powder of different grades separated by the rubber powder grading device, allowing the rest of the rubber powder to enter a centrifugal screen for centrifugal screening, directly packaging the qualified rubber powder, allowing the unqualified rubber powder to enter a flour mill for grinding, sieving by the centrifugal screen, and circulating the steps.

In the process, the induced air pipeline extracts dust possibly generated at the rubber crusher and auxiliary machines of the rubber crusher, the second temperature sensor monitors the internal temperature of the induced air pipeline in real time, when the measured temperature is higher than a set value, the second spray header starts to spray water, and when the temperature drops below the set value, the water spraying is stopped.

Claims

1. A system for producing rubber powder at normal temperature by using waste tires is characterized by comprising a ring cutting machine, a shredder, a butterfly separator, a plurality of rubber breakers and auxiliary machines thereof, a magnetic separator, a fiber separator, a rubber powder bin and a rubber powder grading device which are sequentially connected according to the material conveying direction;

the rubber crusher and the auxiliary machine thereof comprise a rubber crusher, an output belt conveyor arranged below a discharge port at the bottom of the rubber crusher, a vibration classifying screen arranged at the discharge end of the output belt conveyor, a material collecting bin connected with a lower layer discharge port of the vibration classifying screen and a material returning belt conveyor with a feed end connected with an upper layer discharge port of the vibration classifying screen, wherein the discharge end of the material returning belt conveyor is connected with a feed port of the rubber crusher; a first temperature sensor and a first spray head are arranged in the rubber crusher, the first spray head is connected with a first spray water pump, the first temperature sensor is electrically connected with the input end of a first spray controller, and the output end of the first spray controller is electrically connected with a driver of the first spray water pump;

the distribution and conveying of rubber blocks are realized among rubber block bins matched with each rubber crusher through a distribution conveyor, the distribution conveyor is characterized in that a front belt conveyor and a rear belt conveyor are arranged at the top of each rubber block bin, two openable valve plates are arranged at the discharge end of the front belt conveyor, one valve plate is positioned above a feed port of each rubber block bin, and the other valve plate is positioned above the feed end of the rear belt conveyor; the feeding end of a front belt conveyor of a rubber block bin corresponding to the first rubber crusher is connected with the discharging end of the butterfly separator;

2. The system of claim 1, further comprising a centrifugal screen for secondary screening of the rubber powder and a mill for milling the rubber powder.

3. The system as claimed in claim 1, wherein a distributor is provided at the discharge end of the output belt conveyor, the distributor comprises two conveyor belts and a dam plate arranged between the two conveyor belts, the two conveyor belts are opposite in feeding direction, and a vibrating classifying screen is provided at the discharge end of each conveyor belt.

4. A method for producing rubber powder at normal temperature by using waste tires is characterized by comprising the following steps:

a. providing a system according to claim 1, wherein in an initial state, the shredder platen is outside the shredding chamber;

placing the tire into a ring cutting machine, moving a cutter to cut off tire beads on two sides of the tire, collecting the tire beads in a centralized manner, and conveying the tire with the tire beads cut off into a shredding bin of a shredder through a tire conveying track;

b. after the tire with the tire bead cut off enters the shredding bin, a hydraulic cylinder drives a pressure plate to extend into the shredding bin to press the tire, a photoelectric sensor detects a signal and transmits the signal to a spray controller, the spray controller controls a water pump to work, an atomizing nozzle starts spraying into the bin, meanwhile, a roller rotates to cut the tire and cut the tire into rubber blocks, when the set time is reached, the spray water pump and a driving mechanism stop working, a piston rod of the hydraulic cylinder extends outwards, a pressure cover plate is drawn out from the interior of the bin body to prepare for cutting of the next tire, the obtained rubber blocks enter a butterfly selector to be screened, the rubber blocks with qualified sizes enter a rubber block bin to be broken, and the rubber blocks with unqualified sizes return to the shredding bin to be shredded again;

the qualified rubber blocks from the butterfly separator are conveyed outwards by a front belt conveyor of a rubber block bin corresponding to a first rubber crusher, a valve plate corresponding to a feeding port of the rubber block bin is opened, a valve plate corresponding to a rear belt conveyor is closed, the rubber blocks fall into the rubber block bin, when the rubber blocks need to be fed into a rubber block bin of a second rubber crusher, the valve plate corresponding to the rear belt conveyor is opened, the other valve plate is closed, the rubber blocks are conveyed backwards by the subsequent belt conveyors, and the rest is done in the same way, so that the feeding of the rubber block bins of the rubber crushers is realized;

c. the vibration controller controls the vibration motor to work intermittently according to the set feeding time and the feeding interval time, the rubber blocks in the rubber block storage bin are discharged onto the feeding belt conveyor, and the feeding belt conveyor works to convey the rubber blocks into a rubber breaking bin of the rubber crusher;

the rubber blocks enter a rubber breaking bin, are decomposed into rubber powder under the action of friction and extrusion of a pair of rollers, the rubber powder falls onto a belt conveyor through a discharge port at the bottom of a rubber breaker, is conveyed to a vibration grading sieve through an output belt, is graded under the action of vibration screening of the vibration grading sieve, the rubber powder with the particle size smaller than the mesh of a screen mesh of the vibration grading sieve enters a lower-layer slideway through the screen mesh and falls into a material collecting bin, and the rubber powder with the particle size larger than the mesh of the screen mesh of the vibration grading sieve is remained above the screen mesh and is conveyed back into the rubber breaker through a material returning belt conveyor to be; in the process, the first temperature sensor monitors the rubber powder temperature in real time, when the measured temperature is greater than a set value, the first spray header starts to spray water to the rubber powder, and when the temperature drops below the set value, the water spraying is stopped;

5. The method as claimed in claim 4, wherein in step c, the induced draft duct extracts possible dust generated at the rubber crusher and auxiliary machinery thereof, the second temperature sensor monitors the internal temperature of the induced draft duct in real time, the second spray header starts spraying water when the measured temperature is greater than a set value, and stops spraying water when the temperature drops below the set value.

6. The method as claimed in claim 4, wherein in the step e, the rubber powder of different grades separated by the rubber powder grading device enters a centrifugal screen for centrifugal screening, qualified rubber powder is directly packed, unqualified rubber powder enters a flour mill for milling, and then is screened by the centrifugal screen, and the process is circulated.