A high pressure blanket cleaning system

Abstract

The utility model provides a kind of high pressure net blanket cleaning system, including cleaning mechanism and wool cloth water permeability instrument. The water permeability of high pressure net blanket is measured in real time by wool cloth water permeability instrument along the running direction of paper machine, and the control unit of the drive mechanism for driving crossbeam relative to rack movement is electrically connected or signal connection. When the water permeability of certain area of high pressure net blanket is monitored and is lower than preset threshold value, control unit immediately instructs drive mechanism to accurately move crossbeam to the area, and the local area is carried out fixed-point high pressure cleaning by single cleaning nozzle. The cleaning system of the scheme is closed-loop control by "single nozzle+online monitoring", realizes the purpose of early detection, fixed-point cleaning, water and energy saving and prolonging the life of net blanket of local pollution, to effectively improve the uniformity of local dehydration, reduce steam consumption.

Description

Technical Field

[0001] This utility model belongs to the field of papermaking technology, and specifically relates to a high-pressure wire mesh cleaning system. Background Technology

[0002] In the production process of household paper products (such as toilet paper, napkins, and facial tissues), paper machine fabrics, especially high-pressure wire mats (felt), undertake multiple functions of dewatering, conveying, and supporting the paper web. Among these functions, the high-pressure wire mat must withstand linear pressure of several MPa in the press zone and promptly discharge the water pressed out of the wet paper web during circulation. Its dewatering uniformity directly determines the paper web dryness, steam consumption, operating speed, and finished product quality.

[0003] Currently, the industry generally adopts the following cleaning and dehydration process: a high-pressure spray water system periodically or according to vehicle speed and running time washes the entire high-pressure mesh blanket; a vacuum suction box (or vacuum roller) provides negative pressure on the return side to remove water and washed-off impurities from the high-pressure mesh blanket; subsequently, the high-pressure mesh blanket structure is restored by mechanical means such as tension rollers and straightening rollers. However, the above solution has the following shortcomings:

[0004] The lack of online status monitoring means that existing systems typically only monitor macroscopic parameters such as vehicle speed, tension, and temperature, failing to obtain real-time information on the permeability of the netting. Therefore, operators struggle to determine whether the netting has become partially clogged, compacted, or worn, making it impossible to ascertain whether cleaning or replacement is necessary.

[0005] Uneven dehydration leads to increased steam consumption. Localized compaction or blockage of the wire mesh reduces its water and air permeability, decreasing the dehydration efficiency of the paper web in those areas. To achieve the target dryness, the paper machine must increase the steam pressure in the drying section or extend the drying time. This not only increases steam consumption per unit of product but also exacerbates further compaction and aging of the wire mesh, creating a vicious cycle.

[0006] Frequent maintenance downtime impacts production capacity. Because it's impossible to predict localized wire mesh deterioration in advance, inspections are often delayed until uneven moisture content across the paper web, paper breaks, or decreased strength occur. Frequent downtime for cleaning or replacing the wire mesh significantly reduces the paper machine's effective uptime.

[0007] In summary, existing cleaning and dewatering technologies for high-pressure wire mesh in tissue paper machines cannot solve the technical problem of "uneven local dewatering—increased steam consumption—decreased operating efficiency." Therefore, there is an urgent need for a new technology that can monitor the wire mesh status in real time and perform targeted cleaning and optimized dewatering accordingly, in order to reduce energy consumption, improve paper machine operating efficiency, and enhance paper quality. Utility Model Content

[0008] The purpose of this invention is to provide a high-pressure mesh cleaning system that can effectively improve the uniformity of local dehydration and reduce steam consumption.

[0009] To solve the above-mentioned technical problems, this utility model provides a high-pressure mesh blanket cleaning system, including: a cleaning mechanism and a felt permeability meter;

[0010] The cleaning mechanism includes a frame, a crossbeam movably mounted on the frame, a drive mechanism for driving the crossbeam to move relative to the frame, and a cleaning nozzle mounted on the crossbeam. Only one cleaning nozzle is mounted on each cleaning mechanism.

[0011] The fabric permeability meter is used to monitor the permeability of the high-voltage net blanket online. The fabric permeability meter is electrically or signal-connected to the control unit of the drive mechanism. The control unit is used to control the drive mechanism to move the crossbeam to the area when the fabric permeability meter detects that the permeability of a certain area on the high-voltage net blanket is lower than a preset threshold.

[0012] Optionally, the high-pressure mesh cleaning system described above also includes a high-pressure water generating system, wherein the inlet of the cleaning nozzle is connected to the outlet of the high-pressure water generating system.

[0013] Optionally, the high-pressure mesh cleaning system described above also includes a filtration system, wherein the inlet of the filtration system is provided with a water inlet pipe and the outlet is connected to the inlet of the high-pressure water generating system.

[0014] Optionally, in the above-mentioned high-pressure mesh cleaning system, a switching valve is connected in series on the water inlet pipe.

[0015] Optionally, in the above-mentioned high-pressure mesh cleaning system, the filtration system is further provided with a compressed air pipe.

[0016] Optionally, in the above-mentioned high-pressure mesh cleaning system, the number of cleaning mechanisms is multiple.

[0017] Optionally, in the above-mentioned high-pressure mesh cleaning system, the inlets of multiple cleaning mechanisms are all connected to the outlet of the high-pressure water generating system.

[0018] Optionally, in the above-mentioned high-pressure blanket cleaning system, multiple cleaning mechanisms correspond to one high-pressure water generation system and one fabric permeability meter.

[0019] Optionally, in the above-mentioned high-pressure mesh cleaning system, the inlet of the cleaning nozzle is connected to the inlet of the high-pressure water generation system via a high-pressure hose.

[0020] Optionally, in the above-mentioned high-pressure mesh cleaning system, the cleaning mechanism is equipped with a protective cover to prevent high-pressure water from splashing into the crossbeam and the drive mechanism.

[0021] This utility model provides a high-pressure mesh blanket cleaning system, the advantages of which are:

[0022] The permeability of the high-pressure wire mesh is measured in real time along the paper machine's running direction using a felt permeability meter, and is electrically or signal-connected to the control unit of the drive mechanism that moves the crossbeam relative to the frame. When the permeability of a certain area of ​​the high-pressure wire mesh is detected to be lower than a preset threshold, the control unit immediately instructs the drive mechanism to precisely move the crossbeam to that area, where a single cleaning nozzle performs targeted high-pressure cleaning. This cleaning system, through closed-loop control of "single nozzle + online monitoring," achieves early detection of local contamination, targeted cleaning, water and energy conservation, and extended wire mesh life, thereby effectively improving the uniformity of local dewatering and reducing steam consumption. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figures 1-2 A schematic diagram of a high-pressure mesh cleaning system provided in this embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the cleaning mechanism provided in an embodiment of this utility model;

[0026] Figure 4 This is a schematic diagram of the high-pressure water generation system provided in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the filtration system provided in an embodiment of the present invention.

[0028] In the image above:

[0029] 100-Cleaning mechanism;

[0030] 110 - High-pressure hose;

[0031] 200-High-pressure water generation system;

[0032] 300-Filtration System;

[0033] 310 - Water inlet pipe; 320 - Switch valve; 330 - Compressed air pipe. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0035] The core of this invention is to provide a high-pressure mesh cleaning system that can effectively improve the uniformity of local dehydration and reduce steam consumption.

[0036] To enable those skilled in the art to better understand the technical solutions provided by this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] It should be noted that the term "high-pressure wire blanket" as used below refers to any blanket, press felt, or forming wire used in the press section of a paper machine; "high pressure" refers to the linear pressure that the wire blanket withstands during operation, typically ≥1 MPa. Unless otherwise specified, all directions are defined with the direction of paper machine operation as the longitudinal direction and the width direction as the transverse direction.

[0038] For details, please refer to Figures 1-5 The present invention provides a high-pressure mesh blanket cleaning system, comprising: a cleaning mechanism 100 and a fabric permeability meter.

[0039] The cleaning mechanism 100 includes at least a frame, a crossbeam, a drive mechanism, and cleaning nozzles, none of which are shown in the figures. The frame can be a welded steel structure, fixed to the paper machine foundation or the ground with anchor bolts. Specifically, the frame 110 has two linear guide rails along its longitudinal direction, ensuring the crossbeam reciprocates on the linear guide rails. The crossbeam can be a rectangular aluminum profile with an internal weight-reducing cavity. A slider can be installed at the end of the crossbeam, which slides with the linear guide rails, allowing the crossbeam to be movably mounted on the frame. The crossbeam's stroke covers the full width of the high-pressure blanket. The drive mechanism includes a servo motor, a reducer, a synchronous belt, and a tensioning pulley. The servo motor is mounted at one end of the frame and outputs through the reducer. The synchronous belt is fixed to the crossbeam, driving the crossbeam to be precisely positioned longitudinally at a certain speed. Simultaneously, the drive mechanism's movement speed automatically adjusts according to changes in the high-pressure blanket's conveying speed, ensuring full-width cleaning of the high-pressure blanket without blind spots. The cleaning nozzle uses a single-nozzle fixed-point cleaning method, meaning only one high-pressure nozzle is installed on the crossbeam, and the nozzle inlet is connected to an external high-pressure water source through a pipe. The nozzle's spray angle can be electrically adjusted between 25° and 65° to accommodate high-pressure mesh blankets of different weights.

[0040] The felt permeability meter is used for online monitoring of the permeability of high-voltage power line blankets. The felt permeability meter is electrically or signal-connected to the control unit of the drive mechanism. The control unit controls the drive mechanism to move the crossbeam to the area when the felt permeability meter detects that a certain area of ​​the high-voltage power line blanket has a permeability lower than a preset threshold. This preset threshold can be adaptively selected according to actual conditions and is not further limited here.

[0041] It should be noted that the detection principle of the felt permeability meter is mainly based on measuring the rate or volume of liquid permeating through the felt material under pressure difference. The core is to evaluate its permeability performance by quantifying the amount of water permeating the felt per unit time. The following is a detailed analysis of the principle:

[0042] 1. Test Environment Setup

[0043] The instrument is fixed in the test area of ​​the fabric to be tested, forming an isolation structure with sealed sides, making the fabric the only channel for the flow of liquid (usually water). The monitoring equipment can be moved as a whole, while the test area and the fabric remain relatively fixed.

[0044] 2. Pressure differential driven

[0045] The instrument applies stable pressure to one side of the felt (or creates negative pressure on the other side) through a power device (such as a water pump or air pressure device), creating a fixed pressure difference between the two sides of the felt. This pressure difference is the driving force for the liquid to pass through the felt, simulating the stress state of the felt under actual working conditions (such as pressure filtration in a paper machine).

[0046] 3. Permeability Measurement

[0047] Record the volume (or mass) of liquid that permeates through the felt within the set pressure difference and test time. Calculate the permeability using a formula, typically expressed as "the amount of water permeating a unit area of ​​felt per unit time" (e.g., liters / (square meters·minute)).

[0048] 4. Significance of the results

[0049] Water permeability directly reflects the filtration efficiency and fluid permeability of the felt:

[0050] Low permeability may lead to liquid retention, affecting production efficiency (such as insufficient dewatering in papermaking).

[0051] Excessive water permeability may lead to material loss or a decline in product quality due to insufficient filtration.

[0052] In short, the felt permeability meter measures the rate at which liquid permeates through the felt by controlling the pressure difference, quantifying its permeability performance and providing data support for the selection, use, and quality control of felt.

[0053] Specifically, the fabric permeability meter can be arranged in the form of a moving scanning beam, parallel to the cleaning crossbeam, with the cleaning mechanism 100 and the fabric permeability meter located on opposite sides of the high-pressure mesh blanket. Multiple differential pressure sensors are arranged at regular intervals on the moving scanning beam, covering the entire width of the blanket. Each differential pressure sensor touches the surface of the high-pressure mesh blanket with a probe, and the probe's inner cavity is evacuated under constant negative pressure to measure the air permeability value. All differential pressure sensors are connected to a high-speed A / D module via a multi-channel analog switch to convert the air permeability into "equivalent permeability" and display the crossbeam curve in real time. The controller of the fabric permeability meter is connected to the drive mechanism of the cleaning crossbeam via Ethernet for data exchange. The specific control logic involves preset thresholds and area division, dividing the width into N segments, each corresponding to a unique CD coordinate. During the reciprocating motion of the scanning beam, it determines whether the preset threshold is exceeded. If it is, the target coordinate is sent to the drive mechanism, driving the crossbeam to move to that segment, and the cleaning nozzles begin cleaning.

[0054] Of course, the fabric permeability meter can also adopt other structural forms, which will not be elaborated here.

[0055] This solution provides a high-pressure wire mesh cleaning system. A wire mesh permeability meter measures the permeability of the high-pressure wire mesh in real time along the paper machine's running direction. This measurement is electrically or signal-connected to the control unit of the drive mechanism that moves the crossbeam relative to the frame. When the permeability of a certain area of ​​the high-pressure wire mesh is detected to be lower than a preset threshold, the control unit immediately instructs the drive mechanism to precisely move the crossbeam to that area, where a single cleaning nozzle performs targeted high-pressure cleaning. This cleaning system uses high-pressure single-point reciprocating cleaning, combined with online monitoring, for precise cleaning, improving cleaning efficiency. It achieves the goals of early detection of localized contamination, targeted cleaning, water and energy conservation, and extended wire mesh life. It can be widely applied to the maintenance of high-pressure wire meshes in various paper machines, including those for tissue paper and cultural paper. This effectively improves the uniformity of localized dewatering and reduces steam consumption.

[0056] In a specific embodiment, this solution also includes a high-pressure water generating system 200, with the inlet of the cleaning nozzle connected to the outlet of the high-pressure water generating system 200. The high-pressure water generating system 200 is a device for generating high-pressure water, similar to a high-pressure pump.

[0057] This solution also includes a filtration system 300, which has an inlet pipe 310 and an outlet connected to the inlet of the high-pressure water generation system 200. The filtration system 300 is used to perform final purification on the liquid entering the high-pressure water generation system 200 to prevent fine particles from clogging the cleaning nozzles.

[0058] Furthermore, a switch valve 320 can be connected in series on the water inlet pipe 310 to control the flow of water. Of course, the filtration system 300 can also be equipped with a compressed air pipe 330. The compressed air from the compressed air pipe 330 and the high-pressure water from the water inlet pipe 310 form intermittent pulses in the mixing chamber inside the filtration system 300, which enhances the rinsing effect on the cleaning nozzles and high-pressure mesh.

[0059] In one specific embodiment, there are multiple cleaning units 100. These multiple cleaning units 100 are arranged side-by-side, and their inlets are all connected to the outlet of the high-pressure water generation system 200. To further simplify the equipment, each cleaning unit 100 corresponds to one high-pressure water generation system 200 and one fabric permeability meter. One to multiple cleaning units 100 can be supported by a single high-pressure water generation system 200, centrally controlled by a main control cabinet. The system design comprehensively considers the usage scenarios of the wet end and can stably and continuously perform online cleaning. The cleaning pressure at each cleaning point can be adjusted within a certain range according to usage requirements. The high-pressure fabric cleaning system can guarantee 24-hour uninterrupted continuous production. The cleaning water pressure can be stably output between 20-70 bar.

[0060] In a specific embodiment, the inlet of the cleaning nozzle is connected to the inlet of the high-pressure water generation system 200 via a high-pressure hose 110. The high-pressure hose 110 can be a multi-layered steel wire wound hose with strong burst pressure resistance. Its length is designed with a margin of 0.5m for the maximum stroke of the crossbeam to ensure that the high-pressure hose 110 is not stretched or bent when the crossbeam reciprocates across its full width. A wear-resistant sheath can also be fitted onto the outside of the high-pressure hose 110 to prevent friction damage from components such as the frame and high-pressure mesh.

[0061] In a specific embodiment, the cleaning mechanism 100 is provided with a protective cover to prevent high-pressure water from splashing into the crossbeam and drive mechanism, so that the cleaning mechanism 100 of this invention can be used for a long time in harsh wet environments.

[0062] This solution addresses the technical limitations of existing technologies that cannot perform "targeted cleaning." Due to the lack of local condition data, high-pressure spray systems can only perform full-area rinsing according to a fixed program or time cycle. This new cleaning system can increase rinsing intensity and optimize cleaning results in heavily contaminated areas, while avoiding waste of water and energy in relatively clean areas.

[0063] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0064] In the description of this application, "multiple" means two or more. If "first" or "second" is mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0065] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0066] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0067] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0068] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0069] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A high-pressure mesh blanket cleaning system, characterized in that, include: Cleaning unit (100) and fabric permeability meter; The cleaning mechanism (100) includes a frame, a crossbeam movably disposed on the frame, a drive mechanism for driving the crossbeam to move relative to the frame, and a cleaning nozzle disposed on the crossbeam. Only one cleaning nozzle is disposed on one cleaning mechanism (100). The fabric permeability meter is used to monitor the permeability of the high-voltage net blanket online. The fabric permeability meter is electrically or signal-connected to the control unit of the drive mechanism. The control unit is used to control the drive mechanism to move the crossbeam to the area when the fabric permeability meter detects that the permeability of a certain area on the high-voltage net blanket is lower than a preset threshold.

2. The high-pressure mesh blanket cleaning system according to claim 1, characterized in that, It also includes a high-pressure water generating system (200), the inlet of which is connected to the outlet of the high-pressure water generating system (200).

3. The high-pressure mesh blanket cleaning system according to claim 2, characterized in that, It also includes a filtration system (300), which has an inlet pipe (310) at its inlet and an outlet connected to the inlet of the high-pressure water generating system (200).

4. The high-pressure mesh blanket cleaning system according to claim 3, characterized in that, A switch valve (320) is connected in series on the water inlet pipe (310).

5. The high-pressure mesh blanket cleaning system according to claim 3, characterized in that, The filtration system (300) is also provided with a compressed air pipe (330).

6. The high-pressure mesh blanket cleaning system according to claim 2, characterized in that, The number of the cleaning mechanisms (100) is multiple.

7. The high-pressure mesh blanket cleaning system according to claim 6, characterized in that, The inlets of the multiple cleaning units (100) are connected to the outlet of the high-pressure water generating system (200).

8. The high-pressure mesh blanket cleaning system according to claim 7, characterized in that, Each of the multiple cleaning mechanisms (100) corresponds to one of the high-pressure water generating systems (200) and one of the fabric permeability meters.

9. The high-pressure mesh blanket cleaning system according to claim 2, characterized in that, The inlet of the cleaning nozzle is connected to the inlet of the high-pressure water generating system (200) via a high-pressure hose (110).

10. The high-pressure mesh blanket cleaning system according to claim 1, characterized in that, The cleaning mechanism (100) is equipped with a protective cover to prevent high-pressure water from splashing into the crossbeam and the drive mechanism.

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