Lyocell fiber production raw material squeezing device

Abstract

The invention discloses a lyocell fiber production raw material squeezing device which comprises a device frame, a multi-stage squeezing mechanism and an auxiliary discharging mechanism, the multi-stage squeezing mechanism and the auxiliary discharging mechanism are arranged in the device frame, a partition plate is arranged in the device frame and divides the device frame into a dewatering area and a discharging area, and a through hole is formed in the inner side of the partition plate; the multi-stage squeezing mechanism is arranged in the dewatering area and comprises a screw rod and a filter cartridge which are arranged inside and outside, and a squeezing channel is formed between the filter cartridge and the screw rod; the auxiliary discharging mechanism comprises a piston piece and an annular cutting piece, the piston piece comprises a connecting base and a piston sleeve which are nested inside and outside, the two ends of the connecting base are fixedly connected with the device frame and the screw rod, the piston sleeve is movably arranged on the outer side of the connecting base in a sleeving mode through a self-telescopic mechanism, and the narrow end of the piston sleeve is movably arranged in the through hole in a plugged mode. Therefore, through the arrangement of the auxiliary discharging mechanism, the annular cutting piece and the piston piece are matched with each other, and on the premise that the slurry dewatering efficiency is guaranteed, smooth discharging of slurry is effectively promoted through the mechanism.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lyocell fiber production, and particularly relates to a lyocell fiber production raw material pressing device. BACKGROUND

[0002] Lyocell fiber takes natural cellulose (such as wood pulp, bamboo pulp) as raw material, and is spun after being dissolved by NMMO (N-methyl morpholine-N-oxide) solvent system. In the production process, the cellulose pulp needs to go through key steps such as immersion activation, alkali termination reaction and pressing dehydration in turn. The pressing dehydration can remove the excess water (usually containing more than 50% water) in the pulp, so that it reaches the concentration range suitable for dissolution. After dehydration, the pulp is mixed with high-concentration NMMO solution to form a uniform pulp, and then water is further removed by a thin film evaporator to form a spinning solution.

[0003] In the production process of lyocell fiber, the cellulose pulp (or pulp) is the core raw material that needs to be subjected to pressing dehydration treatment. At present, the spiral dewatering machine is a commonly used equipment for pressing the pulp, and its working principle is to generate mechanical extrusion effect by the rotating motion of the screw shaft, and to achieve the separation of the solid-liquid two phases in the pulp by the filtering function of the filter cartridge. During the pressing operation, the pulp near the outlet of the filter cartridge will bear a large extrusion pressure from the screw shaft. Some equipment additionally configures a movable plug to block the outlet of the filter cartridge in order to strengthen the pressing dehydration effect of the pulp. However, this design has obvious disadvantages: the plug is always close to the outside of the outlet, which greatly hinders the smooth discharge of the pulp, and easily causes the outlet blockage problem. The outlet blockage not only causes the screw rotation pressure to rise sharply, but also may cause damage to the machine, thereby increasing the maintenance cost of the equipment. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0005] To this end, one object of the present application is to provide a lyocell fiber production raw material pressing device, which is provided with an auxiliary discharging mechanism. The ring cutting member and the piston member cooperate with each other to effectively promote the smooth discharge of the pulp under the premise of ensuring the dehydration efficiency of the pulp.

[0006] To achieve the above object, the first aspect of the present application proposes a lyocell fiber production raw material squeezing device, comprising a device frame, a multi-stage squeezing mechanism and an auxiliary discharging mechanism arranged in the device frame, wherein a partition is arranged in the device frame, which divides the device frame into a dehydration zone and a discharging zone, and a through hole is arranged on the inner side of the partition; the multi-stage squeezing mechanism is arranged in the dehydration zone and comprises a spiral rod and a filter cartridge arranged inside and outside, wherein one end of the spiral rod penetrates the device frame and is provided with a first driving mechanism; a squeezing channel is formed between the filter cartridge and the spiral rod, one side of the squeezing channel is provided with a feeding hopper, and one side of the feeding hopper penetrates the device frame; the auxiliary discharging mechanism is arranged on the other side of the squeezing channel, and comprises a piston piece and a ring cutting piece, wherein the piston piece comprises a connecting seat and a piston sleeve nested inside and outside, wherein both ends of the connecting seat are fixedly connected with the device frame and the spiral rod, the piston sleeve is movably sleeved on the outer side of the connecting seat through a self-expanding mechanism, and the narrow end of the piston sleeve is movably plugged into the through hole; the ring cutting piece is rotatably arranged on the outer side of the piston sleeve through a second driving mechanism.

[0007] In addition, the lyocell fiber production raw material squeezing device according to the present application can have the following additional technical features:

[0008] In one embodiment of the present application, the connecting seat is arranged in a T-shaped cross section, the piston sleeve is sleeved on the small diameter end of the connecting seat, the self-expanding mechanism comprises a plurality of circumferentially distributed expansion rods, wherein the plurality of expansion rods are arranged between the piston sleeve and the connecting seat, and the expansion rod comprises a fixed shaft and a movable shaft connected with the connecting seat and the piston sleeve respectively, wherein one end of the movable shaft is connected with the piston sleeve, the other end of the movable shaft is embedded in the fixed shaft, and the other end of the movable shaft abuts against a first spring in the fixed shaft.

[0009] In one embodiment of the present application, the ring cutting piece comprises a rotating ring and a plurality of circumferentially distributed cutting rakes arranged on the rotating ring, wherein the rotating ring is arranged on the outer side of the piston sleeve, and the rotating ring is connected with the second driving mechanism; one end of the cutting rake extends into the rotating ring and abuts against a second spring in the rotating ring, and the other end of the cutting rake abuts against the outer wall of the piston sleeve.

[0010] In one embodiment of the present application, the second driving mechanism includes a mounting seat, a plurality of circumferentially distributed driving arms, a second motor, meshing gear rings and gears, wherein the mounting seat is arranged on the inner wall of the device frame, and the connecting seat is arranged on one side of the mounting seat; the output end of the second motor is connected to the gear, and the gear ring is movably sleeved on the outside of the mounting seat; the plurality of driving arms are arranged on the outside of the self-retracting mechanism, and the two ends of the driving arms are respectively connected to the gear ring and the rotating ring.

[0011] In one embodiment of the present application, the first driving mechanism includes a first motor, a first driving wheel and a linkage wheel, wherein one end of the linkage wheel passes through the device frame and is connected to the screw rod; the output end of the first motor is connected to the first driving wheel, and the first driving wheel and the linkage wheel are connected by a belt.

[0012] In one embodiment of the present application, the spiral rod is composed of at least two sections of spiral rods with different diameters connected in sequence, wherein the pitch of multiple spiral rods decreases successively along the direction of the pressing channel, and the pitch of the spiral rod adjacent to the partition is the narrowest.

[0013] In one embodiment of the present application, an inspection port is provided on the filter cartridge, and the inspection port is located below the discharge hopper.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The auxiliary discharging mechanism provided in this application enables the ring cutting member and the piston member to cooperate with each other. Under the premise of ensuring the dehydration efficiency of the slurry, this mechanism effectively promotes the smooth discharge of the slurry;

[0016] 2. The application proposes the introduction of a cutting element to promptly chop the discharged slurry, effectively preventing slurry accumulation and blockage at the outlet and providing powerful assistance for the timely discharge of slurry from the filter cartridge. Specifically, the cutting rake, under the action of the second spring, can always closely abut against the outer wall of the piston sleeve and remain outside the through-hole, thereby continuously chopping the slurry discharged from the through-hole.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1This is a schematic structural diagram of a lyocell fiber production raw material pressing device according to one embodiment of the present application;

[0020] Figure 2 This is a schematic top view of a lyocell fiber production raw material pressing device according to one embodiment of the present application;

[0021] Figure 3 Figure 2 Schematic diagram of the cross-sectional structure at AA in FIG;

[0022] Figure 4 This is a schematic structural diagram of the connection between the screw rod and the auxiliary discharging mechanism of the lyocell fiber production raw material pressing device according to one embodiment of the present application;

[0023] Figure 5 This is a schematic structural diagram of a piston member of a lyocell fiber production raw material pressing device according to one embodiment of the present application;

[0024] Figure 6 This is a schematic structural diagram of a cross section of a telescopic rod of a lyocell fiber production raw material pressing device according to one embodiment of the present application;

[0025] Figure 7 This is a structural schematic diagram of the connection between the ring cutting member and the second driving mechanism of the lyocell fiber production raw material pressing device according to one embodiment of the present application;

[0026] Figure 8 This is a schematic cross-sectional view of the rotating ring of a lyocell fiber production raw material pressing device according to one embodiment of the present application.

[0027] As shown in the figure: 10. Device frame; 101. Dehydration area; 102. Discharge area; 11. Partition; 12. Through hole; 13. Feed hopper; 21. Screw rod; 211. Screw support rod; 22. Filter cartridge; 31. Piston member; 311. Connecting seat; 312. Piston sleeve; 32. Annular cutting member; 321. Rotating ring; 322. Cutting rake; 401. First spring; 402. Second spring; 50. First driving mechanism; 51. First motor; 52. First driving wheel; 53. Interlocking wheel; 54. Belt; 60. Self-retracting mechanism; 601. Retractable rod; 6011. Fixed shaft; 6012. Moving shaft; 70. Second driving mechanism; 71. Mounting seat; 72. Driving arm; 73. Second motor; 74. Gear ring; 75. Gear. DETAILED DESCRIPTION

[0028] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0029] The following describes the lyocell fiber production raw material pressing device according to an embodiment of the present application with reference to the accompanying drawings.

[0030] like Figures 1-8 As shown, the lyocell fiber production raw material pressing device of the embodiment of the present application may include a device frame 10 and a multi-stage pressing mechanism and an auxiliary discharge mechanism arranged inside the device frame 10.

[0031] A partition 11 is provided in the device frame 10 , and the partition 11 divides the device frame 10 into a dehydration area 101 and a discharge area 102 . A through hole 12 is provided on the inner side of the partition 11 .

[0032] The multi-stage pressing mechanism is located within the dehydration zone 101 and may include a screw rod 21 and a filter cartridge 22 disposed internally and externally. The screw rod 21 is composed of at least two sections of screw rods 211 of varying diameters, connected in sequence. The pitch of the multiple screw rods 211 decreases along the direction of the pressing channel, with the pitch of the screw rods 211 adjacent to the partition 11 being the narrowest. One end of the screw rod 21 passes through the device frame 10 and is provided with a first drive mechanism 50. The first drive mechanism 50 may include a first motor 51, a first drive wheel 52, and an interlocking wheel 53. One end of the interlocking wheel 53 passes through the device frame 10 and is connected to the screw rod 21. The output end of the first motor 51 is connected to the first drive wheel 52, and the first drive wheel 52 and interlocking wheel 53 are connected by a belt 54.

[0033] It should be noted that the first drive mechanism 50 described in this embodiment has the function of controlling the forward and reverse rotation of the screw rod 21. The specific operation process is as follows: when the first motor 51 is started, the first motor 51 will drive the first drive wheel 52 connected to it to rotate synchronously. The first drive wheel 52 then drives the linkage wheel 53 to rotate synchronously and in the same direction via the belt 54. The linkage wheel 53 further drives the connected screw rod 21 to rotate synchronously, thereby driving the screw rod 21.

[0034] A pressing channel is formed between the filter cartridge 22 and the screw rod 21 . A feed hopper 13 is provided on one side of the pressing channel. One side of the feed hopper 13 passes through the device frame 10 .

[0035] It should be noted that the baffle 11 described in this embodiment is connected with the filter cartridge 22, and the slurry in the feed hopper 13 can smoothly enter the inside of the filter cartridge 22. In the discharge area 102, the solid slurry passing through the pressing channel can be discharged through the through hole 12; and in the dehydration area 101, the liquid slurry passing through the pressing channel can be discharged from the gap on the filter cartridge 22. In order to facilitate the discharge of the solid slurry and the liquid slurry, corresponding outlets can be respectively arranged in the dehydration area 101 and the discharge area 102.

[0036] The auxiliary discharge mechanism is arranged on the other side of the pressing channel, and the auxiliary discharge mechanism can include a piston piece 31 and a ring cutter 32. The piston piece 31 can include an inner and outer nested connecting seat 311 and a piston sleeve 312, wherein the two ends of the connecting seat 311 are fixedly connected with the device frame 10 and the screw rod 21, the piston sleeve 312 is movably sleeved on the outer side of the connecting seat 311 through the self- expansion mechanism 60, and the narrow end of the piston sleeve 312 is movably inserted into the through hole 12. The connecting seat 311 is arranged in a T-shaped cross section, the piston sleeve 312 is sleeved on the small diameter end of the connecting seat 311, and the self- expansion mechanism 60 can include a plurality of circumferentially distributed expansion rods 601, wherein the plurality of expansion rods 601 are arranged between the piston sleeve 312 and the connecting seat 311, and the expansion rod 601 can include a fixed shaft 6011 and a movable shaft 6012 connected with the connecting seat 311 and the piston sleeve 312 respectively, wherein one end of the movable shaft 6012 is connected with the piston sleeve 312, the other end of the movable shaft 6012 is embedded in the fixed shaft 6011, and abuts against the first spring 401 in the fixed shaft 6011.

[0037] The ring cutter 32 can include a rotating ring 321 and a plurality of circumferentially distributed cutter blades 322 arranged on the rotating ring 321, wherein the rotating ring 321 is arranged on the outer side of the piston sleeve 312, and the rotating ring 321 is connected with the second driving mechanism 70, one end of the cutter blade 322 extends into the rotating ring 321 and abuts against the second spring 402 in the rotating ring 321, and the other end of the cutter blade 322 abuts against the outer wall of the piston sleeve 312.

[0038] It should be noted that when the piston sleeve 312 described in this embodiment moves linearly on the outer side of the connecting seat 311, the cutter blade 322 can always abut against the outer wall of the piston sleeve 312 under the action of the second spring 402. In this way, the cutter blade 322 can continuously implement the chopping operation on the slurry discharged from the through hole 12, ensuring that the slurry is smoothly discharged and does not block.

[0039] Furthermore, when the piston sleeve 312 described in this embodiment is squeezed by the slurry in the through-hole 12, the piston sleeve 312 drives the movable shaft 6012 to move toward the fixed shaft 6011, thereby compressing the first spring 401. When the amount of slurry in the through-hole 12 decreases, the elastic force of the first spring 401 pushes the piston sleeve 312 into the through-hole 12, thereby resetting the piston sleeve 312.

[0040] The annular cutting member 32 is rotatably mounted on the outside of the piston sleeve 312 via a second driving mechanism 70. The second driving mechanism 70 may include a mounting seat 71, a plurality of circumferentially distributed driving arms 72, a second motor 73, a meshing gear ring 74, and a gear 75, wherein the mounting seat 71 is disposed on the inner wall of the device frame 10, and the connecting seat 311 is disposed on one side of the mounting seat 71, the output end of the second motor 73 is connected to the gear 75, the gear ring 74 is movably mounted on the outside of the mounting seat 71, and a plurality of driving arms 72 are disposed on the outside of the self-retracting mechanism 60, and the two ends of the driving arms 72 are respectively connected to the gear ring 74 and the rotating ring 321.

[0041] It should be noted that the second drive mechanism 70 described in this embodiment functions to control the rotation of the circular cutting element 32. Specifically, the second motor 73 is activated, which drives the gear 75 connected to it to rotate synchronously. The gear 75 then drives the meshing gear ring 74 to rotate synchronously in the opposite direction. The gear ring 74, in turn, drives the rotating ring 321 to rotate synchronously via multiple drive arms 72. The rotating ring 321, in turn, drives the multiple cutting rakes 322 to rotate. The rotation of the multiple cutting rakes 322 shreds the discharged solid slurry, effectively preventing clogging of the outlet.

[0042] The filter cartridge 22 is provided with an inspection port (not shown) located below the discharge hopper. When maintenance and overhaul of the device is required, personnel can open the inspection port and reversely rotate the screw 21 via the first drive mechanism 50. The slurry remaining in the pressing channel will then move toward the feed hopper 13 and be discharged through the inspection port, facilitating cleaning and inspection of the interior of the device.

[0043] Specifically, when the pulp needs to be squeezed and dewatered, the relevant personnel first pour the pulp into the feeding hopper 13, and then the pulp enters the squeezing channel. The screw rod 21 starts to rotate under the control of the first driving mechanism 50, and the pulp is conveyed to the partition plate 11. During the conveying process, the screw rod 21 gradually extrudes the pulp, and the extruded liquid pulp is discharged from the gap on the filter cartridge 22. The solid pulp discharged from the through hole 12 will extrude the piston sleeve 312, so as to make the piston sleeve 312 extrude the telescopic rod 601 correspondingly. Because the capacity of the pulp in the through hole 12 is different, the extrusion degree will also change, so that the piston sleeve 312 can move linearly correspondingly. During the movement of the piston sleeve 312, the cutting harrow 322 is always in close contact with the outer wall of the piston sleeve 312 under the action of the second spring 402, and continuously cuts the pulp discharged from the through hole 12, so as to ensure the smooth operation of the whole squeezing and dewatering process.

[0044] In summary, the lyocell fiber production raw material squeezing device of the embodiment of the present application is provided with an auxiliary discharging mechanism, so that the ring cutting part and the piston part cooperate with each other, which effectively promotes the smooth discharge of the pulp under the premise of ensuring the dewatering efficiency of the pulp.

[0045] In the description of the present specification, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0046] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0047] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and deformations to the above embodiments within the scope of the present application.

Claims

1. A lyocell fiber production raw material pressing device, characterized in that: It comprises a device frame (10) and a multi-stage pressing mechanism and an auxiliary discharging mechanism arranged inside the device frame (10), wherein: A partition (11) is provided in the device frame (10), and the partition (11) divides the device frame (10) into a dehydration area (101) and a discharge area (102), and a through hole (12) is provided on the inner side of the partition (11); The multi-stage pressing mechanism is arranged in the dehydration zone (101), and comprises a screw rod (21) and a filter cartridge (22) arranged inside and outside, wherein: One end of the spiral rod (21) passes through the device frame (10) and is provided with a first driving mechanism (50); A pressing channel is formed between the filter cartridge (22) and the screw rod (21), a feed hopper (13) is provided on one side of the pressing channel, and one side of the feed hopper (13) is provided through the device frame (10); The auxiliary discharging mechanism is arranged on the other side of the pressing channel, and the auxiliary discharging mechanism comprises a piston member (31) and a ring cutting member (32), wherein: The piston member (31) includes a connecting seat (311) and a piston sleeve (312) nested inside and outside, wherein the two ends of the connecting seat (311) are fixedly connected to the device frame (10) and the spiral rod (21), the piston sleeve (312) is movably sleeved on the outside of the connecting seat (311) through a self-retracting mechanism (60), and the narrow end of the piston sleeve (312) is movably plugged into the through hole (12); The annular cutting piece (32) is rotatably disposed against the outer side of the piston sleeve (312) via a second driving mechanism (70).

2. The lyocell fiber production raw material pressing device according to claim 1, characterized in that: The cross-section of the connecting seat (311) is T-shaped, the piston sleeve (312) is sleeved on the small diameter end of the connecting seat (311), and the self-telescopic mechanism (60) includes a plurality of circumferentially distributed telescopic rods (601), wherein the plurality of telescopic rods (601) are arranged between the piston sleeve (312) and the connecting seat (311), and the telescopic rod (601) includes a fixed shaft (6011) and a movable shaft (6012) respectively connected to the connecting seat (311) and the piston sleeve (312), wherein one end of the movable shaft (6012) is connected to the piston sleeve (312), and the other end of the movable shaft (6012) is embedded in the fixed shaft (6011) and abuts against the first spring (401) in the fixed shaft (6011).

3. The lyocell fiber production raw material pressing device according to claim 2, characterized in that: The annular cutting member (32) comprises a rotating ring (321) and a plurality of circumferentially distributed cutting rakes (322) provided on the rotating ring (321), wherein: The rotating ring (321) is arranged on the outside of the piston sleeve (312), and the rotating ring (321) is connected to the second driving mechanism (70); One end of the cutting rake (322) extends into the rotating ring (321) and abuts against the second spring (402) in the rotating ring (321), and the other end of the cutting rake (322) abuts against the outer wall of the piston sleeve (312).

4. The lyocell fiber production raw material pressing device according to claim 3, characterized in that: The second driving mechanism (70) includes a mounting seat (71), a plurality of circumferentially distributed driving arms (72), a second motor (73), a meshing gear ring (74) and a gear (75), wherein: The mounting seat (71) is provided on the inner wall of the device frame (10), and the connecting seat (311) is provided on one side of the mounting seat (71); The output end of the second motor (73) is connected to the gear (75), and the gear ring (74) is movably sleeved on the outer side of the mounting seat (71); The plurality of driving arms (72) are arranged outside the self-telescopic mechanism (60), and the two ends of the driving arms (72) are respectively connected to the gear ring (74) and the rotating ring (321).

5. The lyocell fiber production raw material pressing device according to claim 1, characterized in that: The first driving mechanism (50) includes a first motor (51), a first driving wheel (52) and a linkage wheel (53), wherein: One end of the linkage wheel (53) passes through the device frame (10) and is connected to the spiral rod (21); The output end of the first motor (51) is connected to the first driving wheel (52), and the first driving wheel (52) and the linkage wheel (53) are connected via a belt (54).

6. The lyocell fiber production raw material pressing device according to claim 1, characterized in that: The spiral rod (21) is composed of at least two sections of spiral rods (211) with different diameters connected in sequence, wherein the pitches of the plurality of spiral rods (211) decrease in sequence along the direction of the pressing channel, and the pitch of the spiral rod (211) adjacent to the partition (11) is the narrowest.

7. The lyocell fiber production raw material pressing device according to claim 1, characterized in that: The filter cartridge (22) is provided with an inspection port, which is located below the discharge hopper.

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