CN111841760A

CN111841760A - Pulp crushing equipment and method for producing cellulose fibers by solvent method

Info

Publication number: CN111841760A
Application number: CN202010609424.3A
Authority: CN
Inventors: 刘勇; 么志高; 杨爱中; 侯荣超; 周殿朋; 杜占军; 于捍江; 李秋玲; 金杨; 吴运生; 王大明; 吕宝波; 王海猛; 殷权; 李琦
Original assignee: Tangshan Sanyou Yuanda Fiber Co ltd
Current assignee: Tangshan Sanyou Yuanda Fiber Co ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2020-10-30

Abstract

The invention relates to a pulp crushing device and a method for producing cellulose fiber by a solvent method, which comprises the following process steps: the pulp is conveyed into a grinder by a feeding system for grinding, the ground pulp is conveyed into a cyclone separator by a conveying fan, air and the ground pulp are separated by the cyclone separator, the air is conveyed into an exhaust channel and is treated by a recovery system, and the pulp separated from the air enters a storage metering system. The pulp crushing equipment disclosed by the invention completes the quantitative feeding, crushing, conveying, storing and metering of pulp through the feeding system, the grinding machine, the conveying system and the storage metering system, so that the crushing effect of the pulp can be ensured, the crushing degree of the pulp crushed by the grinding machine is 5-200g/L, all requirements of a solvent method (NMMO) for producing cellulose fibers are met, meanwhile, the recovery system is added, and the loss of pulp powder with over-low crushing degree in the conveying and mixing processes can be reduced to the minimum, and the loss can be reduced to be below 0.01%.

Description

Pulp crushing equipment and method for producing cellulose fibers by solvent method

Technical Field

The invention relates to pulp crushing equipment and a method for producing cellulose fibers by a solvent method, belonging to the technical field of production processes for producing cellulose fibers by the solvent method.

Background

Pulp and solvent N-methylmorpholine-N oxide (NMMO) are mixed into a certain proportion of suspended matter in the solvent method for producing cellulose fiber, then the suspended matter is passed through a reaction still to evaporate a certain proportion of water, so that it can be formed into a glue solution with a certain composition, and the glue solution is passed through a filter, and fed into spinning by means of booster pump.

There have been hundreds of patents on methods for producing cellulose fibers using N-methylmorpholine-N-oxide (NMMO) as a solvent, among which there is a method in which low-concentration NMMO (having a water content of 17 to 24%) is directly mixed with pulverized pulp to prepare a mixture, and excess water is evaporated by a thin film evaporator to dissolve cellulose to form a spinning solution having a certain composition. In CN1336451, pulp is pulverized into powder, and then mixed with NMMO with small water content, and the mixture is evaporated to remove water and dissolve cellulose to form spinning solution.

However, the existing pulp crushing equipment and process have poor crushing effect, the crushing degree is difficult to meet the requirements of producing cellulose fibers, and in the crushing process, the pulp powder is greatly lost, so that a certain amount of pulp is wasted, the cost is increased, and the pulp pollution is also caused.

Disclosure of Invention

The technical problem to be solved by the invention is to provide pulp crushing equipment and method for producing cellulose fibers by a solvent method, which not only ensure the crushing effect of pulp, but also reduce the loss of pulp powder to the minimum.

The technical scheme for solving the technical problems is as follows: the pulp crushing equipment for producing the cellulose fibers by the solvent method is characterized by comprising a feeding system, a grinding mill, a conveying system, a storage metering system and a recovery system, wherein the feeding system conveys pulp to an inlet of the grinding mill, the conveying system comprises a conveying fan, a cyclone separator and an exhaust channel, an outlet of the grinding mill is communicated to an air inlet of the conveying fan, an air outlet of the conveying fan is communicated to an inlet of the cyclone separator, the storage metering system is positioned below a solid outlet of the cyclone separator, one end of the exhaust channel is communicated with an air outlet of the cyclone separator, and the other end of the exhaust channel is communicated with the recovery system.

The invention has the beneficial effects that: the pulp crushing equipment provided by the invention completes the quantitative feeding, crushing, conveying, storing and metering of pulp through the feeding system, the grinding machine, the conveying system and the storage metering system, and then sends the crushed pulp to the next procedure, so that the crushing effect of the pulp can be ensured, the crushing degree of the pulp crushed by the grinding machine is 5-200g/L, all requirements of a solvent method (NMMO) for producing cellulose fibers are met, meanwhile, the recovery system is added, and the loss of pulp powder with excessively low crushing degree in the conveying and mixing processes can be reduced to the minimum, and the loss can be less than 0.01%.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, the feeding system comprises a pulp winding device, a pulp winding fixing support and a pulp winding conveying roller set, wherein the pulp winding device is arranged at one end of the pulp winding fixing support and used for feeding pulp rolls formed by pulp through continuous winding to the pulp winding fixing support, and the pulp winding conveying roller set is arranged at the other end of the pulp winding fixing support and used for drawing out pulp on the pulp rolls and conveying the pulp rolls to the grinding machine.

The pulp used in the invention is the special pulp for producing the cellulose fiber by a solvent method, and the pulp fixing bracket can realize the installation, the fixation and the support of a plurality of pulp rolls, thereby realizing the function of continuously using the next pulp roll after one pulp roll is used up.

Further, the installation pulp rolling device comprises a feeding platform and a hydraulic device, one end of the feeding platform is rotatably connected with one end of the upper surface of the pulp rolling fixing support, the lower end of the hydraulic device is rotatably connected with the pulp rolling fixing support, the upper end of the hydraulic device is rotatably connected with the lower surface of the feeding platform, pulp rolls are formed by continuously winding pulp on a pulp rolling rotating shaft, and a limiting bulge for abutting against the pulp rolling rotating shaft is arranged on the upper surface of the feeding platform; the upper surface of the pulp rolling fixing support is provided with at least one rotating groove for placing the pulp rolling rotating shaft; the pulp rolling conveying roller group comprises a driven roller, a driving roller and a conveying motor, pulp extending out of the pulp roll sequentially bypasses the driven roller and the driving roller and then enters an inlet of the grinding machine, and an output end of the conveying motor is connected with the driving roller through a speed reducer and used for driving the pulp roll to rotate.

The beneficial effect of adopting above-mentioned further scheme is that installation book thick liquid device can be installed on book thick liquid fixed bolster through hydraulic means with rolling up thick liquid, through the rotation of hydraulic means control material loading platform, catches on thick liquid book pivot with spacing arch, makes it reach the rotation groove on book thick liquid fixed bolster to realize rolling up the material loading of thick liquid.

Further, the pulp roll is formed by continuously winding pulp with the width of 500mm or 700mm on a pulp rolling rotating shaft, the weight is 400-500 kg, the diameter of the driven roller is 30-60mm, and a speed detection device is arranged at the driving roller.

The pulp rolling machine has the advantages that pulp rolling is a pulp roll which is continuously rolled by pulp with the width of 500mm or 700mm and has the weight of 400-plus 500 kilograms, the width corresponds to the length of the driving roller and the driven roller, the pulp roll is conveniently led to enter the inlet of the grinding machine, the driven roller guides the pulp roll to extend out of the pulp roll, the pulp can be stably conveyed, the diameter of the driven roller is most suitable for 30-60mm, the driving roller is controlled to rotate by the conveying motor, the pulp quantitative conveying function is realized, the pulp is conveyed into the grinding machine in a certain amount, and the specific control mode is that the conveying motor controls the driving roller to rotate through the speed reducer so as to adjust the conveying speed of.

Further, the grinder comprises a grinder shell, a plurality of hammer sheets, a first fluted disc and a grinder screen, wherein an inlet and an outlet of the grinder are respectively arranged on the side wall and the bottom of the grinder shell, the hammer sheets are rotatably arranged in the grinder shell, the first fluted disc is arranged on the inner wall of the grinder shell, a surface with teeth is matched with the rotation track edges of the hammer sheets for crushing pulp, the grinder screen is arranged in the grinder shell and close to the outlet of the grinder and separates the inlet of the grinder, the hammer sheets and the first fluted disc from the outlet of the grinder, and the surface of the grinder screen is matched with the rotation track edges of the hammer sheets for continuously crushing the pulp intercepted by the grinder screen.

The hammer mill can be selected for use by the mill, the main crushing component is a plurality of rotating hammers, the hammer mill is also provided with a first fluted disc matched with the hammers, pulp is crushed by utilizing the rotation of the teeth on the first fluted disc and the hammers, the better crushing effect is realized by the tangency of the teeth of the first fluted disc and the edges of the rotating track of the hammers or the control of the proper gap, the pulp which is not completely crushed is separated by the screen of the mill, the crushing degree is 5-200g/L, and all requirements of the solvent method (NMMO) for producing cellulose fibers are met.

Furthermore, a first fluted disc shaft driven by a variable frequency motor to rotate is arranged in the grinder shell, 32-48 hammer sheets are uniformly distributed on the first fluted disc shaft, the rotating speed of the first fluted disc shaft is 6000rpm, the grinding time is 0.05-1S, a jacket water cavity used for cooling the first fluted disc is fixedly arranged on the inner wall of the grinder shell, the first fluted disc is fixedly connected to the jacket water cavity, the temperature of water in the jacket water cavity is 70-180 ℃, and the aperture of a screen of the grinder is 0.5-2.5 cm.

The beneficial effect who adopts above-mentioned further scheme is that first fluted disc and the supporting use of cover water cavity, cover water cavity and be used for giving first fluted disc cooling can avoid wood pulp to turn yellow easily when high-speed rotation, high-speed friction, can produce the burnt problem of gluing the flavor even, improves crushing effect. The temperature of water in a jacket water cavity for cooling the first fluted disc is 70-180 ℃, and a water inlet and a water outlet are arranged for exchanging heat of water with the outside to ensure the temperature of the water. The screen of the grinder is a mesh structure with a certain aperture, and the screen is used for conveying pulp qualified for grinding to the next process by a conveying fan through the screen of the grinder, and pulp with unqualified blocks is intercepted by the screen of the grinder and continuously ground by a hammer.

Further, the grinder comprises a machine shell, a feeding roller and a tooth stick, wherein an inlet and an outlet of the grinder are respectively arranged on the side wall and the bottom of the machine shell, the feeding roller and the tooth roller are both arranged in the shell, and the feeding roller is arranged close to the inlet of the grinding mill, which comprises two press rolls which are oppositely arranged up and down, the distance between the two press rolls is adjustable and the two press rolls can rotate, the toothed bar is arranged on the other side of the feeding roller opposite to the inlet of the grinding mill, which comprises a second fluted disc shaft and a plurality of second fluted discs which are parallelly attached and fixedly sleeved on the second fluted disc shaft, the outlet of the grinding machine is positioned below the toothed bar, the thickness of the second fluted disc is 1-10mm, the diameter is 100-600mm, the tooth pitch is 2-100mm, and the length of the second fluted disc shaft is 400-1000 mm.

The grinding machine can also adopt a toothed bar type grinding machine, the teeth on the second toothed disc are in high-speed contact with the pulp to form air explosion through the high-speed rotation of the second toothed disc shaft, the adhered cellulose is separated to form cloud shape, and the feeding amount of the pulp can be controlled through the rotating speed of the compression roller.

Further, storage measurement system includes hopper, conveyor belt, measurement belt and premixer, the hopper is located cyclone's solid export below, be equipped with the charge level indicator that is used for the volume of preliminary calculation cellulose in the hopper, its bottom opening is equipped with the setting gauge that is used for the cellulose ejection of compact, conveyor belt is located the below of hopper for accept cellulose and carry, the measurement belt is located the below of conveyor belt discharge end for the volume of accurate calculation cellulose is carried, the premixer is located the below of measurement belt discharge end for form the mixture with the mixture of cellulose and certain proportion's NMMO solvent mixture.

The technical scheme has the advantages that after the cellulose enters the hopper with a certain storage function, the amount of the cellulose in the hopper is displayed through the level indicator, the cellulose in the hopper is uniformly transferred to the conveying belt through the kick-out device at the bottom of the hopper, the cellulose is transferred to the metering belt through the conveying belt, and the cellulose is conveyed into the pre-mixer through the metering belt and is mixed with a certain amount of solvent to form a mixture. The cellulose is accurately metered on a metering belt, and the obtained weighing data is the basis of the addition amount of the solvent.

Further, the recovery system is a bag-type dust removal device, the bag-type dust removal device comprises a box body and a dust removal cloth bag arranged in the box body, and the filtering precision of the bag-type dust removal device is 10-100 meshes.

The dust removal cloth bag has the beneficial effect that fine pulp particles which are not separated by the cyclone separator attached to the wind can be intercepted and recycled by the dust removal cloth bag.

Furthermore, the air inlet of the conveying fan is communicated with the outlet of the grinding machine through an air inlet duct, and the air outlet of the conveying fan is communicated with the cyclone separator through an air supply duct.

The invention also relates to a pulp crushing method for producing cellulose fibers by a solvent method, which is realized by adopting pulp crushing equipment for producing cellulose fibers by the solvent method and comprises the following steps:

step 1: conveying the pulp into a grinder by using a feeding system for grinding, wherein the pulp is in a cloud shape after being ground, and the grinding degree is 5-200 g/L;

step 2: conveying the crushed pulp into a cyclone separator by a conveying fan, separating air and the crushed pulp by the cyclone separator, sending the air into an exhaust channel and treating the air by a recovery system, recovering and reusing cellulose particles in the air, and feeding the pulp separated from the air into a storage metering system for metering and storing.

Drawings

FIG. 1 is a schematic view showing the overall configuration of a pulp crushing apparatus according to the present invention;

FIG. 2 is a schematic view of the feed system of the present invention;

FIGS. 3a and 3b are schematic views showing the structures of two grinding machines according to the present invention;

FIG. 4 is a schematic diagram of the delivery system, storage metering system and recovery system of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. the method comprises the steps of installing a pulp rolling device, 2, pulp rolling, 3, a pulp rolling fixing support, 4, a driven roller, 5, a driving roller, 6, a conveying motor, 7, a hammer, 8, a first fluted disc, 9, a jacket water cavity, 10, a grinding machine screen, 11, a shell, 12, a compression roller, 13, a second fluted disc shaft, 14, a second fluted disc, 15, a conveying fan, 16, an air supply duct, 17, a cyclone separator, 18, an air exhaust channel, 19, a cloth bag type dust removal device, 20, a hopper, 21, a conveying belt, 22, a metering belt, 23, a premixer, 24, a box body, 25 and a dust removal cloth bag.

Detailed Description

The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.

As shown in figures 1 and 4, the invention relates to a pulp crushing device for producing cellulose fibers by a solvent method, which comprises a feeding system, a grinding mill, a conveying system, a storage metering system and a recovery system, wherein the feeding system conveys pulp to an inlet of the grinding mill, the conveying system comprises a conveying fan 15, a cyclone separator 17 and an exhaust channel 18, an outlet of the grinding mill is communicated with an air inlet of the conveying fan 15, an air outlet of the conveying fan 15 is communicated to an inlet of the cyclone separator 17, the storage metering system is positioned below a solid outlet of the cyclone separator 17, one end of the exhaust channel 18 is communicated with an air outlet of the cyclone separator 17, and the other end of the exhaust channel 18 is communicated with the recovery system.

The pulp crushing equipment provided by the invention completes the quantitative feeding, crushing, conveying, storing and metering of pulp through the feeding system, the grinding machine, the conveying device and the storage metering system, and then sends the crushed pulp to the next procedure, so that the crushing effect of the pulp can be ensured, the crushing degree of the pulp crushed by the grinding machine is 5-200g/L, all requirements of a solvent method (NMMO) for producing cellulose fibers are met, meanwhile, a recovery system is added, and the loss of pulp powder with excessively low crushing degree in the conveying and mixing processes can be reduced to the minimum, and the loss can be less than 0.01%.

A feeding system, the purpose of which is to fix the pulp 2 formed by continuous winding of pulp, to enable continuous supply of pulp, and to control the conveyance speed of the pulp 2.

A grinding machine for grinding pulp into a cloud form without causing any squeezing, cutting, yellowing of fibers, etc.

And the material conveying system blows the crushed fibers into the cyclone separator 17 through the conveying fan 15, separates the cellulose and the wind through the downward high-speed selection and installation of the fibers in the cyclone separator 17, and the separated cellulose falls into the storage and metering system. The inlet to the cyclone 17 is located in its side wall, the solids outlet is located at its lower end and the gas outlet is located at its upper end to store a metering system for collecting the cellulose for metering and storage.

A recovery system, which aims to intercept and recycle the fine pulp particles in the air discharged from the exhaust channel 18.

On the basis of the technical scheme, as shown in fig. 2, the feeding system comprises a pulp winding device 1, a pulp winding fixing support 3 and a pulp winding conveying roller set, wherein the pulp winding device 1 is arranged at one end of the pulp winding fixing support 3 and used for feeding a pulp roll 2 formed by continuously winding pulp onto the pulp winding fixing support 3, and the pulp winding conveying roller set is arranged at the other end of the pulp winding fixing support 3 and used for drawing out pulp on the pulp roll 2 and conveying the pulp to the grinding machine.

The pulp used in the invention is the special pulp 2 for producing cellulose fiber by a solvent method, and the pulp fixing bracket 3 can realize the installation, the fixation and the support of a plurality of pulp 2, and realize the function of continuously using the next pulp 2 after one pulp 2 is used up.

Specifically, the installation pulp rolling device 1 comprises a feeding platform and a hydraulic device, one end of the feeding platform is rotatably connected with one end of the upper surface of the pulp rolling fixing support 3, the lower end of the hydraulic device is rotatably connected with the pulp rolling fixing support 3, the upper end of the hydraulic device is rotatably connected with the lower surface of the feeding platform, the pulp roll 2 is formed by continuously winding pulp on a pulp rolling rotating shaft, and a limiting bulge for abutting against the pulp rolling rotating shaft is arranged on the upper surface of the feeding platform; the upper surface of the pulp rolling fixing bracket 3 is provided with at least one rotating groove for placing the pulp rolling rotating shaft; the pulp rolling conveying roller group comprises a driven roller 4, a driving roller 5 and a conveying motor 6, pulp extending out of the pulp roll 2 sequentially bypasses the driven roller 4 and the driving roller 5 and then enters an inlet of the grinding machine, and an output end of the conveying motor 6 is connected with the driving roller 5 through a speed reducer and used for driving the pulp roll to rotate.

The installation is rolled up thick liquid device 1 and can be installed on rolling up thick liquid fixed bolster 3 with rolling up thick liquid 2 through hydraulic means, through the rotation of hydraulic means control material loading platform, catches on thick liquid book pivot with spacing arch, makes it reach the rotation groove on rolling up thick liquid fixed bolster 3 to the material loading of roll up thick liquid is realized.

Preferably, roll up thick liquid fixed bolster 3 can be two parallel tracks, be equipped with two corresponding rotation grooves on every track, installation is rolled up thick liquid device 1 and is also had two loading platforms and two corresponding hydraulic means respectively, spacing arch on two loading platforms supports the both ends of the thick liquid pivot of book that has the pulp of coiling respectively, it is between two tracks and two loading platforms to roll up thick liquid 2, it is a little higher than the upper surface of roll thick liquid fixed bolster 3 to rotate loading platform to its one end of keeping away from roll thick liquid fixed bolster 3 upwards, the lifting is rolled up thick liquid 2 to its rotation groove in the middle of rolling like this, then can be promoted it by manual work and carry out the material loading in the rotation groove on the left side. The pulp rolling 2 is realized by rotating and lifting the feeding platform by a hydraulic device from the right position to the middle position, and the feeding from the middle position to the left position can be finished manually and can be directly pushed away.

The pulp rolling conveying roller set can realize the function of accurately feeding pulp, the speed of the rotating shaft of the output end of the conveying motor 6 is controlled, the feeding speed of the pulp rolling 2 is adjusted through the driven roller 4 and the driving roller 5, and therefore the feeding amount is calculated through the weight per square meter of the pulp, and the purpose of quantitative feeding is achieved.

The pulp extending from the roll 2 can first pass the driven rollers 4, the driven rollers 4 can be provided with a single upper driven roller 4 and a set of two lower driven rollers 4, the pulp first passing from the bottom up over the single upper driven roller 4 and then passing between the two lower driven rollers 4 of the set. After passing the drive roll 5, the drive roll 5 may be set in one set having the same height as the two lower driven rolls 4, and the pulp passes between the drive rolls 5. The driven roller 4, the driving roller 5 and the conveying motor 6 can be arranged above the pulp rolling fixing support 3 through a support fixing frame, for example, a door-shaped support is utilized, the lower parts of two ends of the support are fixed on the pulp rolling fixing support 3, and the upper end of the support is used for installing the driven roller 4, the driving roller 5 and the conveying motor 6.

Preferably, the pulp roll 2 is formed by continuously winding pulp with the width of 500mm or 700mm on a pulp roll rotating shaft, the weight is 400-500 kg, the diameter of the driven roller 4 is 30-60mm, and a speed detection device is arranged at the position of the driving roller 5.

The pulp winding 2 is a pulp winding which is formed by continuously winding pulp with the width of 500mm or 700mm and has the weight of 400-one-food 500 kg, the width corresponds to the length of a driving roller 5 and a driven roller 4, the pulp winding is conveniently led to enter an inlet of a grinding machine, the driven roller 4 guides the pulp winding 2 to extend out of the pulp so as to realize stable conveying of the pulp, the diameter of the driven roller 4 is most suitable for 30-60mm, the driving roller 5 is controlled to rotate by a conveying motor 6 so as to realize the function of quantitative conveying of the pulp, the pulp winding 2 is conveyed into the grinding machine in a certain amount, and the specific control mode is that the conveying motor 6 controls the driving roller 5 to rotate through.

The speed detection device is additionally arranged on the driving shaft 5, so that the rotating speed of the driving roller 5 can be accurately detected, the length of pulp passing through the driving roller 5 per minute can be calculated through the rotating speed and the diameter of the driving roller 5, and the weight of the pulp fed into the grinding machine per minute can be calculated due to the fact that the width and the density (the weight per square meter) of the pulp are fixed, so that the amount of the pulp put into production can be accurately calculated.

On the basis of the above solution, as shown in fig. 3a, the grinding machine comprises a grinder housing, a hammer 7, a first toothed disc 8 and a grinder screen 10, the inlet and the outlet of the grinder are respectively arranged on the side wall and the bottom of the grinder shell, the hammer sheets 7 are provided in plurality, the first fluted disc 8 is rotatably arranged in the grinder shell, the first fluted disc is arranged on the inner wall of the grinder shell, the surface with teeth is matched with the rotating track edges of a plurality of hammer sheets 7 for crushing the pulp, the mill screen 10 is disposed within the mill housing adjacent the mill outlet, separating the mill inlet, the plurality of hammers 7 and the first toothed disc 8 from the mill outlet, the surface of the grinder screen 10 cooperates with the edges of the rotational paths of the hammers 7 for further comminution of the pulp retained by the grinder screen 10 by the hammers 7.

The grinder can select a hammer mill, the main grinding component is a plurality of rotating hammer sheets 7 and a fixed first fluted disc 8 matched with the hammer sheets 7, pulp is ground by utilizing the rotation of the teeth on the first fluted disc 8 and the hammer sheets 7, a good grinding effect is realized by controlling a proper gap between the teeth of the first fluted disc 8 and the edge of the circular rotating track of the hammer sheets 7, the pulp is separated by a fixed grinder screen 10, and pulp which is not completely ground is continuously ground by the hammer sheets 7 by controlling a proper gap between the grinder screen 10 and the edge of the circular rotating track of the hammer sheets 7.

Although the prior art is the hammer mill, generally apply to the feed or food processing field, do not apply in the fiber production field, the invention needs to meet the requirements for producing cellulose fiber to pulverize pulp and adopt the hammer mill, and has adjusted the position of first fluted disc 8 and grinding mill screen mesh 10 and corresponding relation with hammer 7, make it pulverize pulp to the cloud form, guarantee to pulverize degree 5-200 g/L.

Specifically, a first fluted disc shaft driven by a variable frequency motor to rotate is arranged in the grinding machine shell, 32-48 hammer sheets 7 are uniformly distributed on the first fluted disc shaft, the rotating speed of the first fluted disc shaft is 2000-, a jacket water cavity 9 for cooling the first fluted disc 8 is fixedly arranged on the inner wall of the grinder shell, the first fluted disc 8 is fixedly connected to the jacket water cavity 9, the temperature of water in the jacket water cavity 9 is 70-180 ℃ (certain pressure is required in a water system with the temperature exceeding 100 ℃), and the aperture of the screen 10 of the grinding machine is 0.5-2.5 cm.

First fluted disc 8 and the supporting use in clamp cover water cavity 9, clamp cover water cavity 9 is used for giving first fluted disc 8 cooling can avoid wood pulp to turn yellow easily when high-speed rotation, high-speed friction, can produce the problem that burnt flavor is stuck with paste even, improves crushing effect. The temperature of water in the jacket water cavity 9 for cooling the first fluted disc 8 is 70-180 ℃, and a water inlet and a water outlet are arranged for exchanging heat of water with the outside to ensure the temperature of the water. The grinder screen 10 is a mesh structure with a certain aperture, and the function of the mesh structure is that pulp which is qualified for grinding is conveyed to the next process by a conveying fan 15 through the grinder screen 10, and pulp which is large in unqualified blocks is intercepted by the grinder screen 10 and is continuously ground by the hammer 7.

In order to ensure the crushing effect, the number of the hammer sheets 7 is 32-48, the rotating speed of the hammer sheets 7 is controlled by controlling the rotating speed of the variable frequency motor driving the first fluted disc shaft to achieve the effect of controlling the crushing of the pulp, the crushed pulp is generally cloud-shaped, and the crushing degree is 5-200 g/L.

Preferably, the rotation speed of the hammer 7 is controlled to be 2000-6000rpm, and the pulp is crushed at high speed, wherein the crushing time is 0.05-1S.

Preferably, the hammer 7 can radially extend along the first fluted disc shaft and be arranged into a plurality of circles, each circle is uniformly arranged along the circumferential direction of the first fluted disc shaft, and the circles are arranged at equal intervals along the axial direction of the first fluted disc shaft, so that the best crushing effect can be realized, for example, 36 hammer 7 sheets, six circles in total, uniform distribution can be arranged, 32 hammer 7 sheets, eight circles and four circles in total can be arranged in total, and 48 hammer 7 sheets, eight circles and six circles in total can also be arranged in total.

Preferably, the inlet of the grinder is disposed at one side of the upper end of the grinder housing, the first fluted shaft is transversely disposed at the center position in the grinder housing, the hammer 7 is uniformly wound thereon, the first fluted shaft 8 is attached to one side of the upper portion in the grinder housing in an arc shape corresponding to the edge of the rotation track of the hammer 7, which occupies about 1/4 of the cross-sectional area of the grinder housing and corresponds to the rotation direction of the hammer 7, the grinder screen 10 is disposed at the lower portion in the grinder housing in an arc shape corresponding to the edge of the rotation track of the hammer 7, and the outlet of the grinder is disposed at the lower end of the grinder housing. When the hammer 7 rotates, the hammer passes through the first fluted disc 8 on one side and immediately reaches the screen 10 of the grinder, and then the hammer is crushed in the empty part in the grinder shell on the other side.

In addition, the grinding machine can also adopt a toothed bar type grinding machine, as shown in fig. 3b, the grinding machine includes a housing 11, a feeding roller and a toothed bar, an inlet and an outlet of the grinding machine are respectively arranged on the side wall and the bottom of the housing 11, the feeding roller and the toothed bar are both arranged in the housing 11, the feeding roller is arranged near the inlet of the grinding machine, the feeding roller includes two press rollers 12 which are oppositely arranged up and down, the distance between the two press rollers 12 is adjustable and can rotate for feeding pulp, the toothed bar is arranged on the other side of the feeding roller opposite to the inlet of the grinding machine, the toothed bar includes a second toothed disc shaft 13 and a plurality of second toothed discs 14 which are closely attached in parallel and fixedly sleeved on the second toothed disc shaft 13, the outlet of the grinding machine is positioned below the toothed bar, the thickness of the second toothed disc 14 is 1-10mm, and the diameter of 100-600mm, the pitch is 2-100mm, and the length of the second gear shaft 13 is 400-1000 mm. The tooth-rod type grinding machine enables teeth on the second fluted disc 14 to be in high-speed contact with pulp to form air explosion through high-speed rotation of the second fluted disc shaft 13, cellulose adhered together is separated to form a cloud shape, the feeding rods are two compression rollers 12 with certain diameters, the pulp is clamped by the upper compression roller 12 and the lower compression roller 12 after the upper compression roller and the lower compression roller are closed through air cylinders (namely, the space between the upper compression roller and the lower compression roller is controlled by the connected air cylinders, and the upper compression roller and the lower compression roller can be fixed, moved and moved mutually and can be driven by corresponding motors to rotate), and the feeding amount of the pulp is controlled through certain rotating speed (the rotation.

Specifically, the toothed bar is formed by assembling a plurality of second toothed discs 14 with certain thickness on a second toothed disc shaft 13 in series, gaps are not formed among the plurality of second toothed discs 14, the second toothed discs are attached in parallel, teeth are arranged at the peripheral edges of the second toothed discs, and pulp can be smashed into a cloud shape by utilizing the teeth when the toothed bar rotates.

On the basis of the above technical scheme, as shown in fig. 4, the storage metering system includes hopper 20, conveyor belt 21, metering belt 22 and pre-mixer 23, hopper 24 is located cyclone 17's solid export below, be equipped with the charge level indicator that is used for the preliminary calculation cellulose volume in the hopper 20, its bottom opening and be equipped with the setting gauge that is used for the cellulose ejection of compact, conveyor belt 21 is located the below of hopper 20 for accept cellulose and carry, metering belt 22 is located the below of conveyor belt 21 discharge end for the accurate calculation cellulose volume and the transport, pre-mixer 23 is located the below of metering belt 22 discharge end for form the mixture with cellulose and the NMMO solvent mixture of a certain proportion.

After the cellulose enters a hopper 20 with a certain storage function, the amount of the cellulose in the hopper 20 is displayed through a level gauge, the cellulose in the hopper 20 is uniformly transferred onto a conveying belt 21 through a kickoff at the bottom of the hopper 20, the cellulose is transferred onto a metering belt 22 through the conveying belt 21 and is conveyed into a pre-mixer 23 through the metering belt 22, and the mixture is mixed with a certain amount of solvent to form a mixture in the next process. The cellulose is accurately metered on the metering belt 22, and the resulting weighing data is a basis for the amount of solvent added.

The storage and metering system ensures the continuity and stability of production by storing a certain amount of cellulose through the hopper 20, the conveying function is completed through the conveying belt 21 and the metering belt 22, the metering belt 22 has the function of metering the weight of the cellulose, and the metering data is important basic data of adding the weight of the solvent in proportion.

The separated cellulose enters a hopper 20, the hopper 20 is communicated with a material level meter to control the amount of the cellulose in the hopper, the cellulose is uniformly transferred to a conveying belt 21 through a kickoff at the bottom outlet of the hopper 20, the cellulose is transferred to a metering belt 22 through the conveying belt 21, and the cellulose enters a pre-mixer 23 through the metering belt 22. The cellulose is mixed with NMMO with the mass concentration of 50-90% according to a proportion to form a mixture with a certain cellulose composition. The weight of cellulose weighed out by metering belt 22 is based on the NMMO solvent addition.

The level gauge in the hopper 20 is known in the art and is based on the principle that several sensing points are provided in the hopper 20, and when a certain point of the cellulose accumulation zone is sensed, the amount of cellulose on the surface reaches the amount indicated by the point. Generally, it is desirable that the hopper 20 store a quantity of cellulose that is sufficient to maintain a normal production of about 15-30 min, and the level of cellulose in the hopper is measured by a level gauge to prevent excessive spillage and production loss due to insufficient quantity. The cellulose in the hopper 20 needs to be discharged by a kickoff due to light weight, the kickoff consists of a concentric shaft and comb teeth uniformly distributed on the shaft, and the output cellulose amount is controlled by controlling the rotating speed. The metering belt 22 may include a weight scale that weighs the metering belt 22 as a whole, and then as the cellulose is transported, the weight of the whole increases, and the amount of cellulose is calculated from the increase in total weight. The conveying belt 21 and the metering belt 22 are mainly used for conveying cellulose into the pre-mixer 23 to be mixed with a quantitative NMMO solvent through high-speed stirring, meanwhile, the metering belt 22 can also weigh the real-time weight of the cellulose, and the amount of the solvent needing to be added into the pre-mixer is calculated through the real-time weight of the cellulose.

On the basis of the technical scheme, the recovery system is a bag-type dust removal device 19, the bag-type dust removal device 19 comprises a box body 24 and a dust removal bag 25 arranged in the box body 24, and the filtering precision of the bag-type dust removal device 19 is 10-100 meshes.

The exhaust channel 18 is communicated with a box body 24 of the bag type dust removing device 19, the filtered gas is discharged outside, and the fine pulp particles which are not separated by the cyclone separator 17 are intercepted and recycled by the dust removing cloth bag 25. Specifically, the dust removal cloth bag 25 for recovering the fine pulp particles not separated by the cyclone separator 17 in the box 24 of the bag-type dust removal device 19 may be periodically removed, the pulp in the dust removal cloth bag is cleaned and recovered, and the dust removal cloth bag 25 is installed and returned to prepare for the next process.

On the basis of the technical scheme, an air inlet of the conveying fan 15 is communicated with an outlet of the grinding machine through an air inlet duct, and an air outlet of the conveying fan 15 is communicated with the cyclone separator 17 through an air supply duct 16.

The pulp crushing equipment also comprises a control system, which comprises a controller, a control panel, a control circuit, sensors and the like, wherein each sensor detects related technical parameters and transmits the technical parameters to the controller, the controller feeds back information to the control panel, the control panel can input control instructions besides displaying the technical parameters, the controller controls each motor and related execution parts in the pulp crushing equipment, and the related information instructions are transmitted through the control circuit. The control system is conventional in the art, and those skilled in the art can select a general control program and related control devices as needed, and even if there are some specific adjustments in the control system for the features of the present invention, the control system also belongs to the known technology that those skilled in the art can implement and implement, and is not a key point of the present invention, and will not be described herein.

step 2: the crushed pulp is conveyed into a cyclone separator 17 by a conveying fan 15, wind and the crushed pulp are separated by the cyclone separator 17, the wind is sent into an exhaust channel 18 and is treated by a recovery system, cellulose particles in the wind are recovered and reused, and the pulp separated from the wind enters a storage metering system for metering and storage.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. The pulp crushing equipment for producing the cellulose fibers by the solvent method is characterized by comprising a feeding system, a grinding mill, a conveying system, a storage and metering system and a recovery system, wherein the feeding system conveys pulp to an inlet of the grinding mill, the conveying system comprises a conveying fan (15), a cyclone separator (17) and an exhaust channel (18), an outlet of the grinding mill is communicated with an air inlet of the conveying fan (15), an air outlet of the conveying fan (15) is communicated to an inlet of the cyclone separator (17), the storage and metering system is positioned below a solid outlet of the cyclone separator (17), one end of the exhaust channel (18) is communicated with an air outlet of the cyclone separator (17), and the other end of the exhaust channel (18) is communicated with the recovery system.

2. The pulp crushing apparatus for producing cellulose fiber by solvent method according to claim 1, wherein the feeding system comprises a pulp winding device (1), a pulp winding fixing support (3) and a pulp winding conveying roller set, the pulp winding device (1) is arranged at one end of the pulp winding fixing support (3) and is used for feeding pulp roll (2) formed by continuously winding pulp onto the pulp winding fixing support (3), and the pulp winding conveying roller set is arranged at the other end of the pulp winding fixing support (3) and is used for drawing out pulp on the pulp winding roll (2) and conveying the pulp to the grinding machine.

3. The pulp crushing equipment for producing the cellulose fiber by the solvent method according to claim 2, wherein the pulp winding device (1) comprises a feeding platform and a hydraulic device, one end of the feeding platform is rotatably connected with one end of the upper surface of the pulp winding fixing support (3), the lower end of the hydraulic device is rotatably connected with the pulp winding fixing support (3), the upper end of the hydraulic device is rotatably connected with the lower surface of the feeding platform, the pulp roll (2) is formed by continuously winding the pulp on a pulp winding rotating shaft, and a limiting bulge for abutting against the pulp winding rotating shaft is arranged on the upper surface of the feeding platform; the upper surface of the pulp rolling fixing support (3) is provided with at least one rotating groove for placing the pulp rolling rotating shaft; the pulp rolling conveying roller set comprises a driven roller (4), a driving roller (5) and a conveying motor (6), pulp extending out of the pulp roll (2) sequentially bypasses the driven roller (4) and the driving roller (5) and then enters an inlet of the grinding machine, and an output end of the conveying motor (6) is connected with the driving roller (5) through a speed reducer and used for driving the driving roller (5) to rotate.

4. The pulp crushing apparatus for producing cellulose fibers by the solvent method according to claim 1, wherein the grinder comprises a grinder housing, hammers (7), a first toothed disk (8) and a grinder screen (10), the grinder inlet and outlet are provided at the side wall and the bottom of the grinder housing, respectively, the hammers (7) are provided in plural and rotatably provided in the grinder housing, the first toothed disk (8) is provided on the inner wall of the grinder housing and has a toothed surface which is fitted to the rotation trace edges of the hammers (7) for crushing pulp, the grinder screen (10) is provided in the grinder housing near the outlet of the grinder, separating the grinder inlet, the hammers (7) and the first toothed disk (8) from the outlet of the grinder, the surface of the grinder screen (10) is matched with the edges of the rotating tracks of the hammer blades (7) for continuously crushing the pulp retained by the grinder screen (10) by the hammer blades (7).

5. The pulp crushing device for producing the cellulose fiber by the solvent method according to claim 4, wherein a first fluted disc shaft driven by a variable frequency motor to rotate is arranged in the grinder shell, the hammer (7) is provided with 32-48 hammer blades and evenly distributed on the first fluted disc shaft, the rotating speed of the first fluted disc shaft is 6000rpm at 2000-6000rpm, the crushing time is 0.05-1S, a jacket water cavity (9) for cooling the first fluted disc (8) is fixedly arranged on the inner wall of the grinder shell, the first fluted disc (8) is fixedly connected to the jacket water cavity (9), the water temperature in the jacket water cavity (9) is 70-180 ℃, and the aperture of the screen (10) of the grinder is 0.5-2.5 cm.

6. The pulp crushing apparatus for producing cellulose fiber by solvent method according to claim 1, wherein the grinder comprises a housing (11), a feeding roller and a toothed bar, the inlet and the outlet of the grinder are respectively arranged on the side wall and the bottom of the housing (11), the feeding roller and the toothed bar are both arranged in the housing (11), the feeding roller is arranged near the inlet of the grinder and comprises two press rollers (12) which are arranged oppositely up and down, the interval between the two press rollers (12) is adjustable and can rotate for feeding pulp, the toothed bar is arranged on the other side of the feeding roller opposite to the inlet of the grinder and comprises a second toothed disc shaft (13) and a plurality of second toothed discs (14) which are fixedly sleeved on the second toothed disc shaft (13) and are attached closely in parallel, and the outlet of the grinder is positioned below the toothed bar, the thickness of the second fluted disc (14) is 1-10mm, the diameter is 100-600mm, the tooth pitch is 2-100mm, and the length of the second fluted disc shaft (13) is 400-1000 mm.

7. The pulp crushing apparatus for producing cellulose fiber by the solvent method according to claim 1, characterized in that the storage and metering system comprises a hopper (20), a conveyor belt (21), a metering belt (22) and a premixer (23), the hopper (20) is positioned below the solid outlet of the cyclone separator (17), a level meter for preliminarily calculating the amount of cellulose is arranged in the hopper (20), the bottom of the hopper is provided with an opening and a kick-out device for discharging cellulose, the conveying belt (21) is positioned below the hopper (20), used for receiving and conveying cellulose, the metering belt (22) is positioned below the discharge end of the conveying belt (21), for accurately calculating and conveying the amount of cellulose, the premixer (23) is located below the discharge end of the metering belt (22) for storing cellulose.

8. The pulp crushing equipment for producing the cellulose fiber by the solvent method according to the claim 1, wherein the recovery system is a bag-type dust collector (19), the bag-type dust collector (19) comprises a box body (24) and a dust-collecting bag (25) arranged in the box body (24), and the filtering precision of the bag-type dust collector (19) is 10-100 meshes.

9. The pulp crushing equipment for producing the cellulose fiber by the solvent method according to any one of claims 1 to 8, wherein an air inlet of the conveying fan (15) is communicated with an outlet of the grinding mill through an air inlet duct, and an air outlet of the conveying fan (15) is communicated with the cyclone separator (17) through an air supply duct (16).

10. A pulp crushing method for producing cellulose fibers by a solvent method, which is carried out by using the pulp crushing apparatus for producing cellulose fibers by a solvent method according to any one of claims 1 to 9, comprising the steps of:

step 2: the crushed pulp is conveyed into a cyclone separator (17) by a conveying fan (15), wind and the crushed pulp are separated by the cyclone separator (17), the wind is sent into an exhaust channel (18) and is treated by a recovery system, cellulose particles in the wind are recovered and reused, and the pulp separated from the wind enters a storage metering system for metering and storage.