Straw kneading-dilute alkali combined pretreatment and alkali recovery device and method

Abstract

The invention discloses a straw rubbing-dilute alkali combined pretreatment and alkali recovery device and method in the technical field of straw treatment. The device comprises a rubbing unit, a soaking and separating unit, a drying unit, a collecting and precipitating unit, a concentrating unit and a recovery unit. The soaking and separating unit comprises a treatment box as well as a spraying assembly, an alkali liquor inlet and a waste liquor outlet which are arranged on the treatment box, a supporting rod is arranged in the treatment box, a pore plate and driving equipment for driving the pore plate to move are arranged on the supporting rod in a sleeving manner, a plugging block for plugging the pore plate is arranged in the treatment box, and an extrusion assembly is arranged on the supporting rod; the pore plate is located at the bottom of the inner cavity of the treatment box, and the pore plate is blocked by the blocking block, so that straw cannot be taken away in the process of discharging water to clean the straw, impurities contained in waste liquid are reduced, the waste liquid taken away during solid-liquid separation is reduced, the amount of taken-away alkali is reduced, the alkali recovery efficiency is improved, and the environment-friendly effect is achieved. The resource utilization rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of straw treatment, in particular to a straw rubbing-dilute alkali combined pretreatment and alkali recovery device and method. Background Art

[0002] In the field of agricultural waste treatment and resource utilization, straw, as a rich biomass resource, is of great significance for its effective treatment and utilization. When processing straw, it is converted into soft filaments by rubbing, and then the soft filaments are soaked in a dilute alkaline solution. After soaking, the straw is washed and dried, and the waste liquid is recovered. In the process of straw washing, the straw is generally rinsed directly with water, which will cause a large amount of debris in the waste liquid, resulting in a large amount of solid impurities that need to be separated from the waste liquid during solid-liquid separation, thereby taking away a large amount of waste liquid, resulting in a reduction in the amount of alkali liquid recovered, causing a waste of resources. Summary of the invention

[0003] The object of the present invention is to provide a straw rubbing-dilute alkali combined pretreatment and alkali recovery device and method, so as to solve the problem raised in the above background technology that in the process of straw cleaning, the straw is generally directly rinsed with water, which will cause a large amount of debris in the waste liquid, resulting in a large amount of solid impurities that need to be separated from the waste liquid during solid-liquid separation, which will take away a large amount of waste liquid and reduce the amount of alkali liquid recovered.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a straw kneading-dilute alkali combined pretreatment and alkali recovery device, comprising: a kneading unit, a soaking and separation unit, a drying unit, a collection and precipitation unit, a concentration unit and a recovery unit, wherein the kneading unit is used to knead and break up the straw, the soaking and separation unit is used to soak the scattered straw in alkali solution and separate the soaked straw from the waste liquid, the drying unit is used to dry the soaked straw, the collection and precipitation unit is used to collect the waste liquid and precipitate it, the concentration unit is used to concentrate the precipitated waste liquid, and the recovery unit is used to recover the alkali in the concentrated waste liquid;

[0005] The soaking and separation unit includes a treatment box and a spray assembly, an alkali solution inlet and a waste liquid outlet arranged on the treatment box. A support rod is provided in the treatment box, and a orifice plate for blocking the waste liquid outlet and a driving device for driving the orifice plate to move are sleeved on the support rod. A sealing block for blocking the orifice plate is provided in the treatment box, and an extrusion assembly is provided on the support rod; the driving device is used to drive the orifice plate to move closer to the extrusion assembly, so that the restrictions of the sealing block on the orifice plate and the orifice plate on the waste liquid outlet are released, so that the waste liquid inside the treatment box can be discharged through the orifice plate and the waste liquid outlet, and the extrusion assembly is used to clamp and squeeze the straw on the orifice plate, and loosen the straw after the orifice plate is reset.

[0006] Preferably, the driving device includes a second driving member, a winding rod arranged on the output end of the second driving member, and a first flexible connecting member wrapped around the outer wall of the winding rod, a guide groove is provided on the side wall of the support rod, a guide block located in the guide groove is provided on the inner wall of the orifice plate, and the first flexible connecting member is connected to the guide block.

[0007] Preferably, the extrusion assembly includes two sets of sleeves arranged on the support rod, two extrusion plates respectively arranged on the two sets of sleeves, and a first driving member for driving one set of sleeves to rotate.

[0008] Preferably, a moving block and an elastic member connected to the moving block are slidably provided on the side wall of the support rod, the moving block is located on the moving path of the orifice plate and the moving directions of the two are the same, a first air storage tank is provided in the support rod, and a push block for connecting to the moving block is slidably provided in the first air storage tank;

[0009] Among them, the support rod is provided with an installation groove for communicating with the first air storage tank, a pressing piece is slidably provided in the installation groove, and two travel switches are provided in the installation groove, which are respectively located on the upper and lower sides of the pressing piece, and the two travel switches are respectively used to control the forward and reverse rotation of the first driving member.

[0010] Preferably, a second air storage tank is provided in the support rod, a piston and a return spring connected to the piston are slidably provided in the second air storage tank, a movable block for fitting with the inner wall of the guide block is provided on the piston, a mounting hole for communicating with the second air storage tank is provided in the support rod, and a support rod for supporting the pressing piece is slidably provided in the mounting hole.

[0011] Preferably, a receiving groove is provided in the extrusion plate, a support is provided in the receiving groove, a collision ball is provided on the support, and a knocking block and a spring member connected to the knocking block are slidably provided in the receiving groove;

[0012] Among them, the two extrusion plates are each provided with a groove on one side away from each other, a slider is slidably arranged in the groove, a second flexible connecting piece is provided between the slider and the knocking block, and an extrusion block for pushing the slider to move is slidably arranged in the groove.

[0013] Preferably, a magnetic block for adsorbing the slider is slidably provided in the slot, a pull block and a support spring connected to the pull block are hinged in the slot, a third flexible connector is provided between the pull block and the magnetic block, and the pull block is located on the moving path of the extrusion block.

[0014] Preferably, a straw rubbing-dilute alkali combined pretreatment and alkali recovery method, using the above-mentioned straw rubbing-dilute alkali combined pretreatment and alkali recovery device, comprises the following steps:

[0015] S1: The straw enters the kneading unit and is broken into thin strips or fragments, and then enters the soaking and separation unit;

[0016] S2: Add dilute alkali solution to the inside of the treatment box through the alkali solution inlet for soaking. After a preset time, the driving device drives the orifice plate to move upward, and the restrictions of the blocking block on the orifice plate and the orifice plate on the waste liquid outlet are released. The waste liquid inside the treatment box is discharged through the orifice plate and the waste liquid outlet, and the squeezing component works to clamp and squeeze the straw on the top of the upward orifice plate;

[0017] S3: After the driving device drives the orifice plate to move downward and reset, the squeezing assembly loosens the straw and makes it fall onto the orifice plate. Water is injected into the processing box through the spray assembly to clean the straw. The driving device drives the orifice plate upward again to discharge the waste liquid in the processing box, and the squeezing assembly is used to squeeze the straw. The processed straw enters the drying unit for drying.

[0018] S4: The collection and precipitation unit collects the discharged waste liquid and precipitates it, the concentration unit concentrates the precipitated waste liquid, and then the alkali in the concentrated waste liquid is recovered by the recovery unit.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Compared with the existing method of continuously washing straw, the present application soaks the straw in a closed space to remove alkali, and then discharges the waste liquid once, so as to reduce the straw debris contained in the waste liquid, ensure that the alkali carried away during the subsequent solid-liquid separation of the waste liquid is reduced, and through multiple soaking, the straw is thoroughly cleaned, the alkali content on the straw is reduced, and the alkali recovery reaches more than 80%;

[0021] 2. The orifice plate is located at the bottom of the inner cavity of the treatment box, and the orifice plate is sealed with a blocking block, so that the straw will not be taken away during the process of draining water to wash the straw, the impurities contained in the waste liquid are reduced, and the waste liquid taken away during solid-liquid separation is reduced, thereby reducing the amount of alkali taken away, improving the efficiency of alkali recovery, and increasing resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the pretreatment and alkali recovery device of the present invention;

[0023] Figure 2 This is a schematic cross-sectional structural diagram of the soaking and separation unit of the present invention;

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of the connection between the support rod and the orifice plate of the present invention;

[0025] Figure 4 For the present invention Figure 3 A schematic diagram of the structure enlargement in the middle;

[0026] Figure 5 For the present invention Figure 3 A magnified schematic diagram of the structure at B in the middle;

[0027] Figure 6 This is a schematic diagram of the connection structure between the kit of the present invention and the extruded plate;

[0028] Figure 7 This is a schematic diagram of the cross-sectional structure of the extruded plate of the present invention;

[0029] Figure 8 It is a cross-sectional schematic diagram of the connection between the extrusion plate and the extrusion block of the present invention.

[0030] In the figure: 1, kneading unit; 2, soaking and separation unit; 21, treatment box; 22, spray assembly; 23, alkali solution inlet; 24, waste liquid outlet; 25, support rod; 26, orifice plate; 27, blocking block; 28, extrusion plate; 281, storage groove; 282, support; 283, collision ball; 284, knocking block; 285, spring member; 286, slider; 287, second flexible connector; 288, magnetic block; 289, third flexible connector; 2810, support spring; 2811, pull block; 29, kit; 210, first flexible Connecting member; 211, first driving member; 212, mounting groove; 213, travel switch; 214, pressing member; 215, supporting rod; 216, moving block; 217, elastic member; 218, first air storage tank; 219, pushing block; 220, winding rod; 221, second driving member; 222, second air storage tank; 223, piston; 224, movable block; 225, squeezing block; 226, mounting hole; 227, guide block; 228, guide groove; 3, drying unit; 4, collecting sedimentation unit; 5, concentration unit; 6, recovery unit. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1

[0033] See also Figure 1A straw rubbing-dilute alkali combined pretreatment and alkali recovery device comprises: a rubbing unit 1 (rubbing equipment), an immersion separation unit 2, a drying unit 3 (the drying unit 3 comprises a drying box and an electric heating element installed inside the drying box), a collection and precipitation unit 4 (such as a collection box), a concentration unit 5 (such as a membrane separation device) and a recovery unit 6 (an ion exchange resin device); the concentration unit 5 adopts reverse osmosis membrane or nanofiltration membrane technology to allow water molecules to pass through the membrane under pressure and leave a higher concentration of alkali solution; the recovery unit 6 allows the waste liquid to flow through a column equipped with ion exchange resin, and the alkaline substance is adsorbed by the resin. When the resin is saturated, the resin bed can be rinsed with a low concentration of alkali solution to desorb and recover the alkali solution; the concentration of the waste liquid by the concentration unit 5 and the recovery of the alkali by the recovery unit 6 are both prior arts and are not described in detail here.

[0034] See also Figure 2 The soaking and separation unit 2 includes a treatment box 21, a spray assembly 22, an alkali solution inlet 23, a waste liquid outlet 24, a support rod 25, a perforated plate 26 and an extrusion assembly; the treatment box 21 includes a box body and a box cover, the box body and the box cover are detachably connected (such as connected by bolts), the spray assembly 22 and the alkali solution inlet 23 are both installed on the box cover, the spray assembly 22 includes a storage box, a pump arranged inside the storage box and a nozzle connected to the pump, and the waste liquid outlet 24 is arranged on the side wall of the box body At the bottom, a support rod 25 is installed at the bottom of the inner cavity of the box body. The support rod 25 is arranged vertically. The orifice plate 26 is sleeved on the outer wall of the support rod 25. A plurality of blocking blocks 27 are arranged at the bottom of the inner cavity of the box body. The blocking blocks 27 are inserted into the holes of the orifice plate 26, and the top wall of the blocking blocks 27 is flush with the top wall of the orifice plate 26. The blocking blocks 27 block the holes of the orifice plate 26. When the orifice plate 26 is at the bottom of the inner cavity of the box body, the waste liquid outlet 24 is blocked; a driving device and an extrusion assembly are arranged on the support rod 25;

[0035] Among them, see Figure 3 , Figure 4 and Figure 5 The driving device includes a second driving member 221 (such as an electric motor), a winding rod 220 provided at the output end of the second driving member 221, and a first flexible connecting member 210 (a rope, but not limited to a rope) wound around the outer wall of the winding rod 220; a guide groove 228 is provided on the side wall of the support rod 25, a guide block 227 is slidably provided in the inner cavity of the guide groove 228, the guide block 227 is connected to the inner wall of the orifice plate 26, and one end of the first flexible connecting member 210 away from the winding rod 220 is connected to the guide block 227 (there are two guide blocks 227 and guide grooves 228, and the two guide grooves 228 are symmetrically distributed on both sides of the support rod 25);

[0036] See also Figure 2 , Figure 3 and Figure 4The extrusion assembly includes two kits 29, two extrusion plates 28 and a first driving member 211; the two kits 29 are both sleeved on the outer wall of the support rod 25 (one kit 29 is fixedly sleeved on the outer wall of the support rod 25, and the other kit 29 is rotatably sleeved on the outer wall of the support rod 25), and the two extrusion plates 28 are respectively arranged on the side walls of the two kits 29, and the two extrusion plates 28 are opposite to each other and are on the same horizontal plane. The first driving member 211 includes a motor and a gear arranged on the output shaft of the motor. The inner side wall of the rotating kit 29 is provided with an annular tooth, and the gear is meshed with the annular tooth. When the motor works, the gear rotates, driving the kit 29 and the extrusion plate 28 to rotate with the axis of the support rod 25 as the center.

[0037] A straw rubbing-dilute alkali combined pretreatment and alkali recovery method, the steps are as follows:

[0038] First, the straw enters the kneading unit 1 for processing, breaks the straw into thin strips or fragments, and then moves the kneaded straw into the processing box 21 of the soaking and separation unit 2;

[0039] Second, add dilute alkali solution to the interior of the treatment box 21 through the alkali solution inlet 23 to soak the straw. After a preset time (the preset time varies from several hours to one day, and is specifically controlled according to actual needs), the second driving member 221 drives the winding rod 220 to rotate, and the first flexible connecting member 210 is wound around the outer wall of the winding rod 220 to pull the orifice plate 26 upward, so that the restrictions of the blocking block 27 on the orifice plate 26 and the orifice plate 26 on the waste liquid outlet 24 are released, and the waste liquid inside the treatment box 21 passes through the orifice plate 26 and is discharged from the waste liquid outlet 24; when the orifice plate 26 moves up to a predetermined position and stops moving (the top of the orifice plate 26 fits the bottom of the extrusion plate 28), the first driving member 211 drives a kit 29 and an extrusion plate 28 to rotate, so that the two extrusion plates 28 clamp and squeeze the straw above the orifice plate 26 to squeeze the waste liquid in the straw;

[0040] Third, the second driving member 221 drives the winding rod 220 to rotate in the opposite direction, releases the first flexible connecting member 210 from the outer wall of the winding rod 220, drives the orifice plate 26 to move down and reset (at this time, the blocking block 27 blocks the orifice plate 26, and the orifice plate 26 blocks the waste liquid outlet 24), and the first driving member 211 drives the kit 29 and the squeezing plate 28 to rotate in the opposite direction and reset, loosens the straw and makes it fall on the orifice plate 26 (because the fall has a certain height, it will have a certain impact force, which is used to disperse the squeezed straw); water is injected into the processing box 21 through the spray assembly 22, and the straw is rinsed and soaked for a period of time. The driving device drives the orifice plate 26 to move up again to discharge the waste liquid in the processing box 21, and the squeezing assembly also squeezes the straw to reduce the amount of waste liquid contained in the straw (used to increase the amount of alkali recovery), and the treated straw is placed in the drying unit 3 for drying;

[0041] It should be noted that, in order to rinse the straw clean, the process of rinsing and soaking the straw using the spray assembly 22 is repeated several times to reduce the alkali on the straw and increase the amount of alkali recovery.

[0042] Fourth, the collection and sedimentation unit 4 collects the discharged waste liquid, and realizes solid-liquid separation after sedimentation (this process can also be accelerated by adding flocculants, using filter cloth, sand filter or other appropriate filtering equipment to remove suspended matter and fine particles to obtain a relatively clear liquid portion), the concentration unit 5 concentrates the waste liquid obtained in the previous step, and then the recovery unit 6 recovers the alkali in the concentrated waste liquid (through the above steps, the alkali recovery reaches more than 80%).

[0043] In this embodiment, as a further optimized solution, please refer to Figure 3 and Figure 4 A moving block 216 is slidably disposed in the inner cavity of the guide groove 228, an elastic member 217 (spring) is disposed between the guide groove 228 and the moving block 216, the moving block 216 is located above the guide block 227, and the moving direction of the moving block 216 and the guide block 227 are the same, a first gas storage tank 218 is provided inside the support rod 25, the first gas storage tank 218 is filled with gas (such as air), a push block 219 is slidably disposed in the inner cavity of the first gas storage tank 218, and the push block 219 and the moving block 216 are disposed between the guide groove 228 and the moving block 216. The support rod 25 is provided with a mounting groove 212, and a pressing member 214 (such as a block member) is slidably provided in the inner cavity of the mounting groove 212. The pressing member 214 can move up and down. The first air storage tank 218 is connected to the bottom of the inner cavity of the mounting groove 212 through a channel. Two travel switches 213 are provided in the inner cavity of the mounting groove 212. The two travel switches 213 are respectively located at the upper and lower sides of the pressing member 214. The two travel switches 213 are respectively used to control the positive and negative rotation of the motor of the first driving member 211. When the driving device drives the orifice plate 26 to move upward and makes the orifice plate 26 close to the extrusion plate 28, the guide block 227 will contact the moving block 216 and move it upward, so that the push block 219 moves, and part of the gas inside the first gas storage tank 218 is introduced into the inner cavity of the installation groove 212, increasing the gas pressure inside the installation groove 212, so that the pressing member 214 moves upward to press the upper travel switch 213, so that the motor of the extrusion assembly is energized, and a kit 29 and the extrusion plate 28 rotate; when the driving device drives the orifice plate 26 to move upward and makes the orifice plate 26 close to the extrusion plate 28, the guide block 227 will contact the moving block 216 and move it upward, so that the push block 219 moves, and part of the gas inside the first gas storage tank 218 is introduced into the inner cavity of the installation groove 212, and the gas pressure inside the installation groove 212 is increased, so that the pressing member 214 moves upward to press the upper travel switch 213, so that the motor of the extrusion assembly is energized, and a kit 29 and the extrusion plate 28 rotate; when the driving device drives the orifice plate 26 to move upward and make the orifice plate 26 close to the extrusion plate 28, the guide block 227 will contact the moving block 216 and move it upward, so that the push block 219 moves, and the push block 219 moves upward and moves the pushing block 219 to move upward and move ... When the moving device drives the orifice plate 26 to move downward and reset, the force acting on the moving block 216 disappears, and under the action of the elastic member 217, the moving block 216 returns to its original position with the push block 219, and the gas injected into the installation groove 212 is drawn back to the first gas storage tank 218, thereby reducing the air pressure at the bottom of the inner cavity of the installation groove 212, causing the pressing member 214 to move downward under the action of gravity, and press the travel switch 213 on the lower side, so that the motor of the extrusion assembly rotates in the opposite direction, driving the extrusion plate 28 to reverse and reset.

[0044] It should be noted that, in order to enable the pressing member 214 to return to its original position, a spring is installed between the pressing member 214 and the mounting groove 212 , and the spring is used to pull the moving pressing member 214 to return to its original position.

[0045] In this embodiment, as a further optimized solution, please refer to Figure 4 and Figure 5 A second gas storage tank 222 is provided inside the support rod 25, and the interior of the second gas storage tank 222 is filled with gas. A piston 223 is slidably provided in the inner cavity of the second gas storage tank 222, and a return spring is provided between the second gas storage tank 222 and the piston 223. A movable block 224 is provided on the piston 223, and the end of the movable block 224 away from the piston 223 extends to the outside of the second gas storage tank 222 and fits with the inner wall of the guide block 227. A mounting hole 226 is provided in the support rod 25, and the mounting hole 226 is communicated with the second gas storage tank 222. A support rod 215 is slidably provided in the inner cavity of the mounting hole 226, and the top end of the support rod 215 extends to the inner cavity of the mounting groove 212 and fits with the bottom of the pressing member 214; after the orifice plate 26 and the guide block 227 move up, the guide block 227 moves the movable block 224 The restriction disappears, and the return spring moves the piston 223, squeezing the gas inside the second gas storage tank 222 toward the inside of the mounting hole 226, increasing the air pressure inside the mounting hole 226, and pushing the support rod 215 upward; when the orifice plate 26 moves down and is not reset, the pressing piece 214 is reduced by the air pressure force and moves downward to contact the support rod 215, and the support rod 215 is used to support the pressing piece 214 so that it does not contact the lower side travel switch 213, so that the squeezing assembly will not reset and loosen the straw; after the orifice plate 26 moves down and resets, the guide block 227 pushes the movable block 224 and the piston 223 to move, reducing the air pressure inside the mounting hole 226, causing the support rod 215 to move downward under the action of gravity, releasing the restriction on the pressing piece 214, and causing the pressing piece 214 to move downward to press the lower side travel switch 213.

[0046] It should be noted that the top of the end of the movable block 224 away from the piston 223 is an inclined surface; when the orifice plate 26 moves downward with the guide block 227, the guide block 227 contacts the inclined surface of the movable block 224, and squeezes the movable block 224 into the inner cavity of the second air storage tank 222, so that the movable block 224 can be reset.

[0047] Example 2

[0048] As a further optimized solution of Example 1, please refer to Figure 6 and Figure 7A receiving groove 281 is provided inside the extrusion plate 28, a support 282 is provided in the inner cavity of the storage groove 281, a collision ball 283 is placed on the top wall of the support 282, a knocking block 284 is slidably provided in the inner cavity of the storage groove 281, the knocking block 284 is located below the support 282, the knocking block 284 can move up and down, the knocking block 284 is T-shaped, and a spring member 285 is provided between the storage groove 281 and the knocking block 284; the two extrusion plates 28 are both provided with a groove on one side away from each other, an extrusion block 225 is slidably provided in the inner cavity of the groove, a spring is installed between the extrusion block 225 and the groove, a slider 286 is slidably inserted in the inner cavity of the groove, and a second flexible connecting member 287 (a rope, but not The slider 286 is located on the inner side of the extrusion block 225; when one extrusion plate 28 rotates and approaches the other extrusion plate 28 to squeeze the straw, the extrusion block 225 will move toward the inside of the slot, and is used to push the slider 286 to move toward the inside of the slot, and pull the second flexible connecting member 287 to move the knocking block 284 downward to store force; when the extrusion plate 28 is reset, the extrusion on the extrusion block 225 disappears, so that the force on the slider 286 is reduced, and the slider 286 is reset under the action of the spring, and the restriction on the knocking block 284 is released, so that the knocking block 284 collides with the collision ball 283 under the action of the spring member 285, so that it collides inside the storage groove 281, which is used to vibrate the extrusion plate 28 so that the straw will not adhere to the extrusion plate 28.

[0049] It should be noted that a hole is formed through the bottom wall of the support 282, through which the top of the knocking block 284 passes, so that the knocking block 284 can contact the collision ball 283; and the top wall of the support 282 is concave toward the center, so that the position of the collision ball 283 is fixed after stopping.

[0050] In this embodiment, as a further optimized solution, please refer to Figure 7 and Figure 8A magnetic block 288 is slidably provided in the slotted inner cavity, the magnetic block 288 can move up and down, and the magnetic block 288 is used to absorb the slider 286 (the slider 286 is made of a metal material that can be magnetically absorbed, such as iron). A pull block 2811 is hinged on the top of the slotted inner cavity, a support spring 2810 is provided between the slot and the pull block 2811, and a third flexible connecting member 289 (a rope, but not limited to a rope) is provided between the pull block 2811 and the magnetic block 288. The pull block 2811 is located on the moving path of the extrusion block 225; when the extrusion block 225 pushes the slider 286 to move, it also pushes the pull block 2811 to rotate, so that the third flexible connecting member 289 is relaxed, and the pulling force on the magnetic block 288 is released, so that it moves down and is aligned with the extrusion block 225 under the action of gravity. The slider 286 is aligned to absorb and fix the moved slider 286; when the extrusion block 225 begins to reset, since the extrusion block 225 is still squeezing the pulling block 2811, the position of the magnetic block 288 remains unchanged, resulting in the slider 286 not being reset immediately; when there is a certain distance between the extrusion block 225 and the slider 286, the force of the extrusion block 225 on the pulling block 2811 disappears, and under the action of the supporting spring 2810, the pulling block 2811 resets, pulling the third flexible connector 289, so that the magnetic block 288 moves up and is misaligned with the slider 286, releasing the adsorption force on the slider 286, allowing the knocking block 284 to release and impact the collision ball 283, ensuring that the knocking block 284 can exert a sufficiently large force on the collision ball 283.

[0051] It should be noted that the immersion separation unit has been treated with anti-corrosion (provided with an anti-corrosion coating) to prevent the equipment from being corroded by alkali.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A straw rubbing-dilute alkali combined pretreatment and alkali recovery device, comprising: A kneading unit (1), a soaking and separation unit (2), a drying unit (3), a collection and precipitation unit (4), a concentration unit (5) and a recovery unit (6), characterized in that: the kneading unit (1) is used to knead and break up the straw, the soaking and separation unit (2) is used to soak the scattered straw in alkali liquid and separate the soaked straw from the waste liquid, the drying unit (3) is used to dry the soaked straw, the collection and precipitation unit (4) is used to collect the waste liquid and precipitate it, the concentration unit (5) is used to concentrate the precipitated waste liquid, and the recovery unit (6) is used to recover the alkali in the concentrated waste liquid; The soaking and separation unit (2) comprises a treatment box (21) and a spray assembly (22), an alkali solution inlet (23) and a waste liquid outlet (24) arranged on the treatment box (21); a support rod (25) is arranged in the treatment box (21); a perforated plate (26) for blocking the waste liquid outlet (24) and a driving device for driving the perforated plate (26) to move are sleeved on the support rod (25); a blocking block (26) for blocking the perforated plate (26) is arranged in the treatment box (21); 7), the support rod (25) is provided with a squeezing assembly; the driving device is used to drive the orifice plate (26) to move closer to the squeezing assembly, so that the blocking block (27) releases the restriction on the orifice plate (26) and the orifice plate (26) releases the restriction on the waste liquid outlet (24), so that the waste liquid inside the treatment box (21) can be discharged through the orifice plate (26) and the waste liquid outlet (24), and the squeezing assembly is used to clamp and squeeze the straw on the orifice plate (26), and release the straw after the orifice plate (26) is reset.

2. A straw rubbing-dilute alkali combined pretreatment and alkali recovery device according to claim 1, characterized in that: The driving device comprises a second driving member (221), a winding rod (220) arranged at the output end of the second driving member (221), and a first flexible connecting member (210) wound around the outer wall of the winding rod (220); a guide groove (228) is arranged on the side wall of the support rod (25); a guide block (227) located in the guide groove (228) is arranged on the inner side wall of the orifice plate (26); and the first flexible connecting member (210) is connected to the guide block (227).

3. A straw rubbing-dilute alkali combined pretreatment and alkali recovery device according to claim 2, characterized in that: The extrusion assembly comprises two sets (29) arranged on the support rod (25), two extrusion plates (28) respectively arranged on the two sets (29), and a first driving member (211) for driving one set (29) to rotate.

4. A straw rubbing-dilute alkali combined pretreatment and alkali recovery device according to claim 3, characterized in that: A moving block (216) and an elastic member (217) connected to the moving block (216) are slidably provided on the side wall of the support rod (25); the moving block (216) is located on the moving path of the orifice plate (26) and the moving directions of the two are the same; a first air storage tank (218) is provided in the support rod (25); a push block (219) for connecting to the moving block (216) is slidably provided in the first air storage tank (218); The support rod (25) is provided with a mounting groove (212) for communicating with the first air storage tank (218), a pressing member (214) is slidably provided in the mounting groove (212), and two travel switches (213) are provided in the mounting groove (212) and are respectively located on the upper and lower sides of the pressing member (214), and the two travel switches (213) are respectively used to control the forward rotation and reverse rotation of the first driving member (211).

5. A straw rubbing-dilute alkali combined pretreatment and alkali recovery device according to claim 4, characterized in that: A second air storage tank (222) is provided in the support rod (25), a piston (223) and a return spring connected to the piston (223) are slidably provided in the second air storage tank (222), a movable block (224) for fitting with the inner wall of the guide block (227) is provided on the piston (223), a mounting hole (226) for communicating with the second air storage tank (222) is provided in the support rod (25), and a support rod (215) for supporting the pressing member (214) is slidably provided in the mounting hole (226).

6. The straw rubbing-dilute alkali combined pretreatment and alkali recovery device according to claim 3, characterized in that: The extrusion plate (28) is provided with a receiving groove (281), a support (282) is provided in the receiving groove (281), a collision ball (283) is provided on the support (282), and a knocking block (284) and a spring member (285) connected to the knocking block (284) are slidably provided in the receiving groove (281); Wherein, the two extrusion plates (28) are provided with a groove on one side away from each other, a slider (286) is slidably arranged in the groove, a second flexible connecting piece (287) is provided between the slider (286) and the knocking block (284), and an extrusion block (225) for pushing the slider (286) to move is slidably arranged in the groove.

7. A straw rubbing-dilute alkali combined pretreatment and alkali recovery device according to claim 6, characterized in that: A magnetic block (288) for absorbing the slider (286) is slidably disposed in the slot, a pull block (2811) and a support spring (2810) connected to the pull block (2811) are hinged in the slot, a third flexible connector (289) is disposed between the pull block (2811) and the magnetic block (288), and the pull block (2811) is located on the moving path of the extrusion block (225).

8. A straw rubbing-dilute alkali combined pretreatment and alkali recovery method, using a straw rubbing-dilute alkali combined pretreatment and alkali recovery device as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1: The straw enters the kneading unit (1) and is broken into thin strips or fragments, and then enters the soaking and separation unit (2); S2: adding diluted alkali liquid to the interior of the treatment box (21) through the alkali liquid inlet (23) for soaking, and after a preset time, the driving device drives the orifice plate (26) to move upward, and releases the restrictions of the blocking block (27) on the orifice plate (26) and the orifice plate (26) on the waste liquid outlet (24), and the waste liquid in the treatment box (21) is discharged through the orifice plate (26) and the waste liquid outlet (24), and the squeezing component works to clamp and squeeze the straw on the top of the upwardly moving orifice plate (26); S3: After the driving device drives the orifice plate (26) to move downward and reset, the squeezing assembly loosens the straw and causes it to fall onto the orifice plate (26). Water is injected into the processing box (21) through the spraying assembly (22) to clean the straw. The driving device drives the orifice plate (26) to move upward again to discharge the waste liquid in the processing box (21). The squeezing assembly is used to squeeze the straw. The processed straw enters the drying unit (3) for drying. S4: The collection and precipitation unit (4) collects the discharged waste liquid and precipitates it, the concentration unit (5) concentrates the precipitated waste liquid, and then the alkali in the concentrated waste liquid is recovered by the recovery unit (6).

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