Auxiliary equipment for dismounting a paper machine blade

Abstract

The application provides an auxiliary dismounting device for a paper machine doctor blade, comprising a first support base, a second support base and a connecting rod, the first support base and the second support base are fixedly connected with the connecting rod along the length direction of the connecting rod, the top surface of the first support base is provided with a first rolling mechanism, the first rolling mechanism is used for rolling contact with the doctor blade to be dismounted, the bottom surface of the first support base is provided with a first arc-shaped structure, the first arc-shaped structure is matched with the shape of a drying cylinder and is used for lap joint with the surface of the drying cylinder, the top surface of the second support base is provided with a second rolling mechanism, the second rolling mechanism is used for rolling contact with the doctor blade to be dismounted, the bottom surface of the second support base is provided with a second arc-shaped structure, the second arc-shaped structure is matched with the shape of the drying cylinder and is used for lap joint with the surface of the drying cylinder. The auxiliary dismounting device for the paper machine doctor blade provided by the application can realize quick extraction and entry of the doctor blade and has the characteristics of simple structure and convenient operation.

Description

Technical Field

[0001] This application relates to the technical field of paper machine maintenance equipment, specifically to an auxiliary disassembly and assembly device for paper machine doctor blades. Background Technology

[0002] In the paper, textile, printing, and similar industries, drying cylinders are key pieces of equipment, playing a crucial role in removing surface moisture and accelerating the drying process. The drying cylinder scraper, as an important auxiliary tool in the drying cylinder system, primarily functions to remove residues and moisture, maintain uniform heat transfer efficiency, protect the drying cylinder surface, improve production efficiency, and promote energy conservation and emission reduction. It is of great significance for improving product quality, extending the service life of the drying cylinder, and maintaining the stable operation of the production line. Therefore, companies attach great importance to the selection, installation, and maintenance of drying cylinder scrapers to ensure they are always in optimal working condition.

[0003] In a papermaking workshop, there are about a hundred doctor blades in use on a production line. However, the air hood is in harsh conditions such as high temperature, high humidity and chemicals (chloride ions) all year round, which causes the paint on the doctor blade surface to age and peel off. The exposed doctor blade surface continues to corrode, causing rust to fall off. The paint and rust falling off the doctor blade surface fall on the paper web surface, directly causing holes and paper breaks, as well as quality abnormalities when a small amount of rust falls off, resulting in downgrades and reprinting losses. At the same time, there is also a potential risk of secondary damage to the equipment.

[0004] To address issues such as paint peeling and rust flaking, a manual on-machine grinding and maintenance solution was previously employed due to limited downtime. However, this method was inefficient, and removing the paint compromised the corrosion protection of the scraper body. Furthermore, prolonged operation at high temperatures inside the drying cylinder could lead to heatstroke for personnel and potential secondary damage to other equipment. A long-term, reliable solution is to repaint the scraper body according to the factory-specified specifications. The main challenge lies in the removal and installation of the scraper holder.

[0005] However, when replacing the scraper blades, the operating space at the upper and lower scraper blade positions is narrow, and the high-temperature environment inside the air hood makes it difficult for personnel to operate while wearing slings, posing a significant safety hazard. Each replacement of a lower scraper blade requires cutting off a sheet of dry netting, so one scraper blade is replaced each time during netting replacement, but the number of lower scrapers that need to be replaced is large. The upper roller scraper blade is barely replaceable using a three-chain hoisting system and a crane, with replacement time reaching 8 hours per blade or even longer. Furthermore, the dry netting deforms after being hung on the slings, necessitating a replacement of the dry netting upon startup, severely impacting machine operation. The lower roller scraper blade is difficult to find a fulcrum for replacement, making it virtually impossible to replace. Summary of the Invention

[0006] This application provides an auxiliary disassembly and assembly device for a paper machine doctor blade. The auxiliary disassembly and assembly device includes a first support base, a second support base, and a connecting rod. The first support base and the second support base are respectively fixedly connected to the connecting rod along the length direction of the connecting rod. The top surface of the first support base is provided with a first rolling mechanism for the doctor blade to be disassembled to roll into contact. The bottom surface of the first support base is provided with a first arc-shaped structure, which is adapted to the shape of the drying cylinder and is used to overlap and cooperate with the surface of the drying cylinder. The top surface of the second support base is provided with a second rolling mechanism for the doctor blade to be disassembled to roll into contact. The bottom surface of the second support base is provided with a second arc-shaped structure, which is adapted to the shape of the drying cylinder and is used to overlap and cooperate with the surface of the drying cylinder.

[0007] In some embodiments, the auxiliary disassembly and assembly device further includes a third support base, wherein the first support base, the second support base, and the third support base are respectively fixedly connected to the connecting rod along the length direction of the connecting rod.

[0008] In some embodiments, the top surface of the third support base is provided with a third rolling mechanism, which is used for the scraper to be disassembled to roll into contact. The bottom surface of the third support base is provided with a third arc-shaped structure, which is adapted to the shape of the drying cylinder and is used to overlap and cooperate with the surface of the drying cylinder.

[0009] In some embodiments, the first rolling mechanism, the second rolling mechanism, and the third rolling mechanism each include a bracket and a roller. The roller is connected to a support base via the bracket and is used to make rolling contact with the scraper to be disassembled.

[0010] In some embodiments, the first support, the second support, and the third support each include a plurality of rolling mechanisms.

[0011] In some embodiments, the connecting rod includes two parallel first connecting rods and a second connecting rod, and the first support, the second support, and the third support are fixedly connected to the first connecting rod and the second connecting rod respectively along the length direction of the first connecting rod and the second connecting rod.

[0012] In some embodiments, the surfaces of the first arc-shaped structure, the second arc-shaped structure, and the third arc-shaped structure are all provided with rubber pads.

[0013] In some embodiments, the auxiliary disassembly and assembly equipment further includes an auxiliary support, which includes a lifting bracket and a bracket. The bracket is fixedly connected to the lifting bracket, the lifting bracket is used to connect to a lifting device, and the bracket is used to support the scraper to be disassembled and assembled.

[0014] In some embodiments, the bracket is provided with a rubber partition on the surface that contacts the scraper to be removed.

[0015] In some embodiments, the lifting bracket is provided with lifting lugs at both ends.

[0016] The paper machine doctor blade auxiliary disassembly and assembly device provided in this application embodiment has a support base structure with the bottom surface of the drying cylinder as the fulcrum, and a rolling mechanism on the top surface that makes rolling contact with the doctor blade to be disassembled and assembled. This device can realize the quick extraction and insertion of the doctor blade and has the characteristics of simple structure and convenient operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an embodiment of the auxiliary disassembly and assembly equipment of this application in conjunction with the paper machine;

[0019] Figure 2 yes Figure 1 A partial structural diagram in the embodiment;

[0020] Figure 3 yes Figure 2 A schematic diagram of the structure from another perspective;

[0021] Figure 4 This is a schematic diagram of the structure of an embodiment of the auxiliary disassembly and assembly equipment of this application;

[0022] Figure 5 This is a structural schematic diagram of the second (third) support base of the auxiliary disassembly and assembly equipment of this application;

[0023] Figure 6 This is a schematic diagram of the structure of an embodiment of the auxiliary support of this application in conjunction with a scraper;

[0024] Figure 7 This is a schematic diagram of another embodiment of the auxiliary support of this application in conjunction with a scraper. Detailed Implementation

[0025] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0026] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] Please refer to the following: Figures 1 to 3 , Figure 1 This is a schematic diagram of an embodiment of the auxiliary disassembly and assembly equipment of this application in conjunction with the paper machine. Figure 2 yes Figure 1 A partial structural diagram in the embodiment. Figure 3 yes Figure 2A schematic diagram from another perspective of the structure; wherein, the paper machine includes multiple drying cylinders (and rollers, etc.) 200, and the drying cylinders (and rollers) 200 may have different diameters. Doctor blades 300 are arranged adjacent to the drying cylinders 200 and inserted between adjacent drying cylinders 200. The auxiliary disassembly and assembly device 100 in this embodiment is mainly used to pull out or insert the doctor blade 300 to be disassembled from the narrow gap between adjacent drying cylinders 200.

[0029] Please refer to the following: Figure 4 , Figure 4 This is a schematic diagram of an embodiment of the auxiliary disassembly and assembly device of this application. The auxiliary disassembly and assembly device 100 in this embodiment includes a first support base 110, a second support base 120, a third support base 130, and a connecting rod 140. It should be noted that the auxiliary disassembly and assembly device 100 in this embodiment is only schematically shown to include the first support base 110, the second support base 120, and the third support base 130. In other embodiments, the auxiliary disassembly and assembly device 100 may only include the first support base 110 and the second support base 120, or it may include more sets of support bases; these will not be listed and described in detail here.

[0030] Specifically, in this embodiment, the first support base 110, the second support base 120, and the third support base 130 are sequentially and fixedly connected to the connecting rod 140 along its length, specifically via bolts. Optionally, in this embodiment, the connecting rod 140 may include two parallel first connecting rods 141 and second connecting rods 142, with the first support base 110, the second support base 120, and the third support base 130 sequentially and fixedly connected to the first connecting rod 141 and the second connecting rod 142 along their respective lengths.

[0031] Optionally, the first support base 110, the second support base 120, and the third support base 130 in this embodiment may have the same or similar structures (only the positions of the rollers may differ slightly). The illustrations in this embodiment only focus on one of them; the other two have similar or slightly different structures. The top surface of the first support base 110 is provided with a first rolling mechanism 111, which is used for the scraper 300 to be disassembled to roll into contact. The bottom surface of the first support base 110 is provided with a first arc-shaped structure 112, which is adapted to the shape of the drying cylinder 200 and is used to overlap and cooperate with the surface of the drying cylinder 200. In this embodiment, the first arc-shaped structure 112 may be located at both ends of the first support base 110, and the curvature of the first arc-shaped structure 112 at both ends may be different to accommodate drying cylinders or rollers of different diameters. The surface of each first arc-shaped structure 112 is provided with a rubber pad 150, which is used to prevent scratching the surface of the drying cylinder 200.

[0032] In this embodiment, the first rolling mechanism 111 may include a bracket 1111 and a roller 1112. The roller 1112 is connected to the first support base through the bracket 1111 and is used to make rolling contact with the scraper to be disassembled. Optionally, each support base in this embodiment may include multiple first rolling mechanisms 111. The specific structure, shape, arrangement direction, and position of the first rolling mechanism 111 vary depending on the contact surface with the scraper to be disassembled or the scraper of different specifications, and will not be described in detail here.

[0033] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of the second (third) support base of the auxiliary disassembly and assembly equipment of this application. The structure of the second support base 120 is similar to that of the first support base 110. Its top surface may also be provided with a second rolling mechanism 121, which is used for rolling contact with the scraper to be disassembled. The second rolling mechanism 121 may also include a bracket 1111 and a roller 1112. The roller 1112 is connected to the first support base through the bracket 1111 and is used for rolling contact with the scraper to be disassembled. The bottom surface of the second support base 120 is provided with a second arc-shaped structure 122, which is adapted to the shape of the drying cylinder 200 and is used for overlapping and mating with the surface of the drying cylinder 200.

[0034] The top surface of the third support base 130 is provided with a third rolling mechanism 131, which is used for the scraper 300 to be disassembled to roll into contact. The bottom surface of the third support base 130 is provided with a third arc-shaped structure 132, which is adapted to the shape of the drying cylinder 200 and is used to overlap and cooperate with the surface of the drying cylinder 200.

[0035] The first rolling mechanism 111, the second rolling mechanism 121, and the third rolling mechanism 131 each include a bracket 1111 and a roller 1112. The roller is connected to the support base via the bracket and is used for rolling contact with the scraper 300 to be disassembled. The first support base 110, the second support base 120, and the third support base 130 may each include multiple rolling mechanisms. The surfaces of the first arc-shaped structure 112, the second arc-shaped structure 122, and the third arc-shaped structure 132 may each be provided with a rubber pad 150.

[0036] The structure of the first support base can be different from that of the second / third support base. Given the difference in upper / lower structures, because the lower scraper is prone to rotation after the fixing device is removed, causing the scraper clamp to easily scrape against the surface of the upper drying cylinder, the first support base, in addition to having the function of sliding and pulling out the upper scraper, also has a fixing and positioning function, ensuring that the upper scraper does not rotate after being removed (the setting position and number of the first rolling mechanism 111 of the first support base (marked as 1118) differ from those of the second / third support base). Depending on the scraper's extraction direction, the first support base structure is installed on the outermost side of the extraction direction, and the second / third support base structure is installed on the innermost side of the extraction direction. For example, if the scraper is pulled out to the right, the first support base is installed on the rightmost side of the scraper, and the second / third support base is installed on the leftmost side. The left side structure of the first support base is the same as that of the second / third support base, but the right support roller structure on the right side can be different from that of the second / third support base. Its structure is the same as that of the right left support roller of the first support base. It is symmetrically installed with the upper scraper, and the left and right rollers are at a certain angle, which can stably fix the upper scraper on the rollers and allow it to slide.

[0037] Additionally, the auxiliary disassembly and assembly equipment in this application embodiment may also include an auxiliary bracket, please refer to the following: Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the structure of an embodiment of the auxiliary support in this application, in conjunction with a scraper. Figure 7 This is a schematic diagram of another embodiment of the auxiliary support bracket of this application in cooperation with a scraper. The auxiliary support bracket 400 includes a lifting bracket 410 and a bracket 420. The bracket 420 is fixedly connected to the lifting bracket 410. The lifting bracket 410 is used to connect to a lifting device (or sling) 500, and the bracket 420 is used to support the scraper 300 to be disassembled. The shape of the bracket 420 can vary depending on the contact surface with different scrapers or the specifications of the scrapers; no specific limitation is made here.

[0038] The bracket 420 has a rubber partition 421 on the surface that contacts the scraper 300 to be disassembled, which serves to buffer and protect the scraper 300. Additionally, the surface of the rubber partition 421 in contact with the scraper is relatively rough to increase friction, facilitating the later removal of the scraper. The lifting bracket 410 has lifting lugs 411 at both ends, and the lifting bracket 410 is connected to the lifting device 500 via the lifting lugs 411.

[0039] The following describes the usage and working process of the auxiliary disassembly and assembly equipment in the embodiments of this application. First, the drying cylinder is stopped, and then the auxiliary disassembly and assembly equipment is placed on the drying cylinder by the worker. After placement, the scraper bodies on both sides can be placed on the auxiliary disassembly and assembly equipment one after the other. The worker can then manually pull out 1 / 3 of the scraper 300 to the outside of the air hood (outside the gap of the drying cylinder 200), and then pull it out with the help of the auxiliary bracket 400, the hoisting crane and other equipment (specifically, the auxiliary bracket 400 can be installed when the scraper is being pulled out, the scraper can be pulled out to 2 / 3 by the crane, the other auxiliary bracket can be installed, and then the scraper can be completely pulled out to complete the scraper removal action). The installation is the reverse.

[0040] The paper machine doctor blade auxiliary disassembly and assembly equipment in this embodiment can solve the problems caused by paint flakes, rust, etc. falling onto the paper web surface, resulting in holes and paper breaks, and quality abnormalities leading to downgrades and rework losses. It enables rapid, batch replacement of doctor blades, easily facilitating the extraction and installation of doctor blades, and is universally applicable to upper and lower doctor blades under various working conditions. With the doctor blade quick-release device suspended after the equipment is installed, the doctor blade replacement speed can be reduced from 8 hours / blade to less than 2 hours / blade. Equipment maintenance time is significantly reduced by more than 75%, and the wear of the matching dryer is reduced by approximately 90%. Abnormal downtime caused by paint flakes and other issues is effectively reduced by approximately 95%. Simultaneously, it greatly reduces manual labor intensity and has achieved good results in actual production.

[0041] The paper machine doctor blade auxiliary disassembly and assembly device provided in this application embodiment has a support base structure with the bottom surface of the drying cylinder as the fulcrum, and a rolling mechanism on the top surface that makes rolling contact with the doctor blade to be disassembled and assembled. This device can realize the quick extraction and insertion of the doctor blade and has the characteristics of simple structure and convenient operation.

[0042] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. An auxiliary disassembly and assembly device for paper machine doctor blades, characterized in that, The auxiliary disassembly and assembly equipment includes a first support base, a second support base, and a connecting rod. The first support base and the second support base are fixedly connected to the connecting rod along its length. The top surface of the first support base is provided with a first rolling mechanism for the scraper to be disassembled to roll into contact. The bottom surface of the first support base is provided with a first arc-shaped structure that is adapted to the shape of the drying cylinder and is used to overlap and cooperate with the surface of the drying cylinder. The top surface of the second support base is provided with a second rolling mechanism for the scraper to be disassembled to roll into contact. The bottom surface of the second support base is provided with a second arc-shaped structure that is adapted to the shape of the drying cylinder and is used to overlap and cooperate with the surface of the drying cylinder.

2. The auxiliary disassembly and assembly equipment according to claim 1, characterized in that, The auxiliary disassembly and assembly equipment also includes a third support base, wherein the first support base, the second support base, and the third support base are respectively fixedly connected to the connecting rod along the length direction of the connecting rod.

3. The auxiliary disassembly and assembly equipment according to claim 2, characterized in that, The top surface of the third support base is provided with a third rolling mechanism, which is used for the scraper to be disassembled to roll and contact. The bottom surface of the third support base is provided with a third arc-shaped structure, which is adapted to the shape of the drying cylinder and is used to overlap and cooperate with the surface of the drying cylinder.

4. The auxiliary disassembly and assembly equipment according to claim 3, characterized in that, The first rolling mechanism, the second rolling mechanism, and the third rolling mechanism all include a bracket and a roller. The roller is connected to the support base through the bracket and is used to make rolling contact with the scraper to be disassembled.

5. The auxiliary disassembly and assembly equipment according to claim 4, characterized in that, The first support, the second support, and the third support all include multiple rolling mechanisms.

6. The auxiliary disassembly and assembly equipment according to claim 2, characterized in that, The connecting rod includes two parallel connecting rods, namely a first connecting rod and a second connecting rod. The first support, the second support, and the third support are fixedly connected to the first connecting rod and the second connecting rod respectively along the length direction of the first connecting rod and the second connecting rod.

7. The auxiliary disassembly and assembly equipment according to claim 3, characterized in that, The surfaces of the first arc-shaped structure, the second arc-shaped structure, and the third arc-shaped structure are all provided with rubber pads.

8. The auxiliary disassembly and assembly equipment according to any one of claims 1-7, characterized in that, The auxiliary disassembly and assembly equipment also includes an auxiliary support, which includes a hoisting bracket and a support frame. The support frame is fixedly connected to the hoisting bracket. The hoisting bracket is used to connect with a lifting device, and the support frame is used to support the scraper to be disassembled and assembled.

9. The auxiliary disassembly and assembly equipment according to claim 8, characterized in that, The bracket is used to provide a rubber partition on the surface that comes into contact with the scraper to be disassembled.

10. The auxiliary disassembly and assembly equipment according to claim 8, characterized in that, The hoisting bracket is equipped with lifting lugs at both ends.

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