Search

CN-122013584-A - Utilize compressed air pad to eliminate steady thick liquid mechanism of pulse

CN122013584ACN 122013584 ACN122013584 ACN 122013584ACN-122013584-A

Abstract

The invention relates to the technical field of papermaking equipment, in particular to a pulp stabilizing mechanism for eliminating pulses by utilizing a compressed air cushion, which comprises a pulp inlet taper pipe, a pulp stabilizing cover, a screen plate and a spray defoaming mechanism, wherein the pulp inlet taper pipe is of a taper cylindrical structure with a wide upper part and a narrow lower part, the bottom end of the pulp inlet taper pipe is connected with the pulp inlet pipe, the pulp stabilizing cover is of a cylindrical cover body structure, the bottom end of the pulp stabilizing cover is connected with the top end of the pulp inlet taper pipe, a pulp outlet is formed in the side wall of the pulp stabilizing cover, the screen plate is arranged between the top end of the pulp inlet taper pipe and the bottom end of the pulp stabilizing cover, and the spray defoaming mechanism is arranged at the inner top of the pulp stabilizing cover and is used for spraying water to the liquid level to eliminate foam on the liquid level. The invention weakens the pulse phenomenon in the slurry by arranging the slurry stabilizing mechanism at the front side of the flow box and blocking the flow of the paper pulp through the sieve plate and the slurry inlet taper pipe.

Inventors

  • LI WENBIN

Assignees

  • 广东理文造纸有限公司

Dates

Publication Date
20260512
Application Date
20260330

Claims (10)

  1. 1. A slurry stabilizing mechanism for eliminating pulse by using compressed air cushion is characterized by comprising: the slurry inlet taper pipe (100), wherein the slurry inlet taper pipe (100) is of a taper cylindrical structure with a wide upper part and a narrow lower part, and the bottom end of the slurry inlet taper pipe is connected with the slurry inlet pipe; the slurry stabilizing cover (200) is of a cylindrical cover body structure, the bottom end of the slurry stabilizing cover (200) is connected with the top end of the slurry inlet taper pipe (100), and the side wall of the slurry stabilizing cover is provided with a slurry outlet (201); The sieve plate (300) is arranged between the top end of the slurry inlet taper pipe (100) and the bottom end of the slurry stabilizing cover (200); The spray defoaming mechanism (400) is arranged at the inner top of the slurry stabilizing cover (200) and is used for spraying water to the liquid level to eliminate foam on the liquid level; the top of the slurry stabilizing cover (200) is also provided with an air inlet header pipe (500) which is used for supplying air into the slurry stabilizing cover (200) so as to enable the upper part of the liquid level to be in a positive pressure environment.
  2. 2. The slurry stabilizing mechanism for eliminating pulse with compressed air cushion according to claim 1, wherein the center of the top end of the slurry stabilizing cover (200) is provided with an inspection hole, and an inspection cover (202) is detachably arranged in the inspection hole.
  3. 3. The pulp stabilizing mechanism utilizing compressed air cushion to eliminate pulse according to claim 1, wherein an exhaust pipe (501) is arranged on the air inlet main pipe (500), an air inlet control valve (502) is further arranged on one end, close to the pulp stabilizing cover (200), of the air inlet main pipe (500), and an exhaust control valve (503) is arranged on the exhaust pipe (501).
  4. 4. The pulp stabilizing mechanism utilizing compressed air cushion to eliminate pulse according to claim 1, wherein the screen plate (300) comprises an annular positioning part (301) and a porous plate (302), the annular positioning part (301) is fixedly connected with the top of the pulp inlet cone (100), the porous plate (302) is slidingly connected below the annular positioning part (301) along the vertical direction, and an elastic sealing layer (303) is arranged between the annular positioning part (301) and the porous plate (302) along the circumferential direction in a sealing manner; The opposite surfaces of the annular positioning part (301) and the porous plate (302) are respectively provided with an electromagnet (305) and a permanent magnet block (306), and when the electromagnet (305) is switched between a power-off state and a power-on state, the porous plate (302) can move up and down.
  5. 5. The pulp stabilizing mechanism utilizing the compressed air cushion to eliminate pulses is characterized in that the spraying defoaming mechanism (400) comprises four spraying pipes (401) which are arranged in a rectangular shape, spraying holes (402) are formed in the lower surface of each spraying pipe (401) at intervals along the axial direction of each spraying pipe, a displacement portion (403) is fixedly arranged at the top of each spraying pipe (401) through a pipe clamp, and the displacement portion (403) is in sliding fit with the inner top surface of the pulp stabilizing cover (200).
  6. 6. The slurry stabilizing mechanism utilizing the compressed air cushion to eliminate the pulse according to claim 5, wherein the displacement portion (403) and the slurry stabilizing cover (200) are in sliding fit along the radial direction of the slurry stabilizing cover (200), linear driving structures (404) which are in one-to-one correspondence with the four spraying pipes (401) are further arranged at four corners of the inner top surface of the slurry stabilizing cover (200), and movable ends of the linear driving structures (404) are connected with the corresponding displacement portion (403) so as to control the four spraying pipes (401) to be in divergent shape and gathered or separated.
  7. 7. The slurry stabilizing mechanism for eliminating pulse by utilizing compressed air cushion according to claim 6, wherein both ends of the spray pipe (401) are slidably provided with an extension pipe (405), the extension pipe (405) is axially slidably connected with the spray pipe (401) along the self, the extension pipe (405) is in a shape of an opening with an outer end closed and an inner end, and a plurality of spray pores are arranged on the bottom surface of the pipe wall of the extension pipe (405) along the self axial direction at intervals; The outer end of the extension pipe (405) is sleeved with a movable sleeve (406), the outer surface of the movable sleeve (406) is provided with a sliding column (407), the inner top surface of the slurry stabilizing cover (200) is provided with a sliding groove (203) for embedding the sliding column (407), when four spray pipes (401) are in a closed state, spray fine holes on the extension pipe (405) are retracted into the spray pipes (401) and aligned with corresponding spray holes one by one, and when four spray pipes (401) are in a dispersed state, the spray fine holes extend out of the spray pipes (401).
  8. 8. The slurry stabilizing mechanism utilizing the compressed air cushion to eliminate pulse according to claim 6, wherein a liquid level transmitter (600) is further arranged at the top end of the slurry stabilizing cover (200), a controller (700) is further arranged outside the slurry stabilizing cover (200), a signal output end of the liquid level transmitter (600) is connected with the controller (700), and a signal output end of the controller (700) is connected with the electromagnet (305) and the linear driving structure (404).
  9. 9. The slurry stabilizing mechanism utilizing compressed air cushion elimination pulse according to claim 8, wherein the internal liquid level of the slurry stabilizing cover (200) is provided with a first height interval and a second height interval, when the liquid level is in the first height interval, the electromagnet (305) is in an electrified state, and four spray pipes (401) are in a dispersed state; When the liquid level is in the second height interval, the electromagnet (305) is in a power-off state, and the four spray pipes (401) are in a closed state.
  10. 10. The slurry stabilizing mechanism for eliminating pulse with compressed air cushion according to claim 1, wherein the bottom end of the slurry stabilizing cover (200) and the top end of the slurry inlet cone pipe (100) are flange-shaped and are fixed by bolts.

Description

Utilize compressed air pad to eliminate steady thick liquid mechanism of pulse Technical Field The invention relates to the technical field of papermaking equipment, in particular to a pulp stabilizing mechanism for eliminating pulse by using a compressed air cushion. Background In the paper making production process, the pulp box is used as key equipment and has the core function of uniformly and stably conveying pulp to the lip plate, and the pulp flows out from the lip plate and enters the wet part of the paper machine to complete the subsequent paper web forming and other processes, and the pulp feeding stability of the pulp box directly determines the quality of paper. However, in the actual production process, the slurry flow pulse phenomenon is common, and the slurry supply stability is seriously affected. Specifically, the generation of the slurry flow pulse is caused by various factors, wherein the rotation of an impeller of a pump and the periodical rotation of a rotor wing sieve directly cause the pulsation phenomenon in a slurry box, and meanwhile, free air, pipe vibration and the like stored in a pipeline can also cause the slurry flow pulsation, so that the slurry flow instability is further aggravated. The presence of these pulses can cause irregular fluctuations in the pulp flow velocity and pressure, which can lead to uneven distribution of the pulp flowing out of the headbox lip, and thus increase the longitudinal quantitative difference of the web, affect the uniformity and stability of the web, and can also cause defects such as pinholes, holes and the like in the paper sheet, and significantly reduce the quality of the finished paper. At present, the existing slurry stabilizing measures are difficult to eliminate the pulse efficiently, and therefore, we propose a slurry stabilizing mechanism for eliminating the pulse by using a compressed air cushion to solve the defects well. Disclosure of Invention The invention aims to provide a slurry stabilizing mechanism for eliminating pulses by using a compressed air cushion, which is used for solving the problems in the background technology. The invention is realized by the following technical scheme that the slurry stabilizing mechanism for eliminating pulse by using the compressed air cushion comprises: The slurry inlet taper pipe is of a taper cylindrical structure with a wide upper part and a narrow lower part, and the bottom end of the slurry inlet taper pipe is connected with the slurry inlet pipe; The slurry stabilizing cover is of a cylindrical cover body structure, the bottom end of the slurry stabilizing cover is connected with the top end of the slurry inlet taper pipe, and the side wall of the slurry stabilizing cover is provided with a slurry outlet; The screen plate is arranged between the top end of the slurry inlet taper pipe and the bottom end of the slurry stabilizing cover; the spray defoaming mechanism is arranged at the inner top of the slurry stabilizing cover and is used for spraying water to the liquid level to eliminate foam on the liquid level; the top of the slurry stabilizing cover is also provided with an air inlet main pipe which is used for supplying air into the slurry stabilizing cover so as to enable the upper part of the liquid level to be in a positive pressure environment. Optionally, an inspection hole is formed in the center of the top end of the slurry stabilizing cover, and an inspection cover is detachably arranged in the inspection hole. An exhaust pipe is arranged on the air inlet main pipe, an air inlet control valve is further arranged at one end, close to the slurry stabilizing cover, of the air inlet main pipe, and an exhaust control valve is arranged on the exhaust pipe. The sieve plate comprises an annular positioning part and a porous plate, wherein the annular positioning part is fixedly connected with the top of the pulp inlet taper pipe, the porous plate is connected below the annular positioning part in a sliding manner along the vertical direction, an elastic sealing layer is arranged between the annular positioning part and the porous plate in a circumferential sealing manner, an electromagnet and a permanent magnet block are respectively arranged on the opposite surfaces of the annular positioning part and the porous plate, and the porous plate can move up and down when the electromagnet is switched between an outage state and an electrifying state. Optionally, spray defoaming mechanism includes four shower that are the rectangle form and arrange, the lower surface of shower is provided with the hydrojet hole along self axial interval, the top of shower is equipped with displacement portion through the pipe strap is fixed, displacement portion and steady thick liquid cover's interior top surface sliding fit. The displacement portion and the slurry stabilizing cover are in sliding fit along the radial direction of the slurry stabilizing cover, linear driving structures corresponding to t