Air cushion drying box of paper machine

Abstract

The utility model relates to an air cushion drying box of a paper machine, which comprises a box body, a drying layer and a cold air layer, the steering roller sets are arranged in the box body, the number of the steering roller sets is multiple, and each steering roller set comprises two steering rollers; a plurality of groups of broken paper detection devices are arranged, and the broken paper detection devices are arranged between the two turning rollers of the turning roller group; the plurality of alarm indication devices are in one-to-one correspondence with each group of broken paper detection devices; and the control system is connected to the alarm indicating device and the broken paper detection device. According to the air cushion drying box, a worker can timely know the broken paper in the air cushion drying box and the position of the broken paper, timely treatment can be carried out, paper blockage caused by the broken paper is avoided, and the serious influence on paper injection and paper tail cleaning is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of papermaking, in particular to an air cushion drying box of a papermaking machine. BACKGROUND

[0002] In the existing papermaking machine, paper break detection is an indispensable part, which integrates various types of measurement methods.

[0003] In the current pulp board machine, single-point measurement is used, the measurement distance span is large, and there is no related paper break detection device in the air cushion drying box, so it is difficult to determine the specific position of the paper break. The paper block caused by the internal paper break will have a serious impact on the paper leading and paper tail cleaning. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the present application provides an air cushion drying box of a papermaking machine, which solves the problem that the existing air cushion drying box lacks a paper break detection device, it is difficult to determine the specific position of the paper break in the air cushion drying box, and the paper block caused by the internal paper break has a serious impact on the paper leading and paper tail cleaning.

[0005] To achieve the above purpose, the inventors provide an air cushion drying box of a papermaking machine, which comprises:

[0006] a box body, a drying layer and a cold air layer are arranged in the box body, the drying layer is arranged on the top of the cold air layer, the drying layer is connected to the inlet of the box body, and the cold air layer is connected to the outlet of the box body;

[0007] a plurality of deflection roller groups, each deflection roller group comprises two deflection rollers arranged alternately on both sides of the box body, and the deflection rollers are used to make the pulp board present an S shape and be conveyed in the drying layer and the cold air layer;

[0008] a plurality of paper break detection devices, the paper break detection devices are arranged between the two deflection rollers of each deflection roller group, and the paper break detection devices are used to detect whether the pulp board between each deflection roller group appears paper break;

[0009] a plurality of alarm indication devices, which correspond to each paper break detection device one by one;

[0010] a control system connected to the alarm indication devices and the paper break detection devices.

[0011] In some embodiments, a paper state detection device is further included, which is arranged at the inlet of the box body, connected to the control system, and used to detect the state of the paper entering the box body.

[0012] In some embodiments, the paper break detection device is a photoelectric detection switch or a reflective infrared sensor or a machine vision paper break detection device.

[0013] In some embodiments, further comprising:

[0014] A high-speed camera, the high-speed camera is a plurality of groups, the high-speed camera is arranged between the two deflection rollers of each group of deflection roller groups, and the high-speed camera is used to shoot the pulp board between each group of deflection roller groups.

[0015] In some embodiments, the alarm indicating device is an alarm flash.

[0016] In some embodiments, the drying layer is 27 layers, and the cold air layer is 2 layers.

[0017] In some embodiments, the box further comprises a transition layer between the drying layer and the cold air layer.

[0018] In some embodiments, a plurality of paper break detection devices are arranged between the two deflection rollers of each group of deflection roller groups.

[0019] Different from the prior art, the above technical solution, through the paper break detection device arranged between the two deflection rollers of the deflection roller group in the box of the air cushion drying box, when the pulp board passes through the deflection roller group and is dried in the drying layer and the cold air layer of the air cushion drying box, the paper break detection device between each group of deflection roller groups detects the paper break of the pulp board in the conveying process, when the paper break of the pulp board is detected, the corresponding alarm indicating device is controlled by the control system according to the paper break detection device to send an alarm prompt, so that the staff can know the position of the paper break in the air cushion drying box in time, and can handle it in time to avoid the paper break caused by the paper break, reduce the serious influence on the paper leading and paper tail cleaning.

[0020] The above utility model content related record is only the summary of the technical scheme of the present application, in order to let the ordinary skilled person in the art can more clearly understand the technical scheme of the present application, and then can be implemented according to the content recorded in the description and drawings, and in order to let the above purpose and other purposes, characteristics and advantages of the present application can be more easily understood, the following combining with the specific embodiment of the present application and the drawings are described. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings are only used to show the principles, implementation modes, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and cannot be considered as the limitation of the present application.

[0022] In the drawings of the specification:

[0023] Figure 1A structural schematic diagram of the air cushion drying box of the paper machine according to the embodiment;

[0024] Figure 2 A structural schematic diagram of the paper break detection system according to the embodiment;

[0025] Figure 3 A structural schematic diagram of the turning roller group according to the embodiment;

[0026] Figure 4 Another structural schematic diagram of the paper break detection system according to the embodiment;

[0027] Figure 5 A structural schematic diagram of the installation position of the paper break detection device according to the embodiment.

[0028] The reference signs involved in the above-mentioned drawings are explained as follows:

[0029] 110, box,

[0030] 111, drying layer,

[0031] 112, cold air layer,

[0032] 121, turning roller,

[0033] 130, paper break detection device,

[0034] 140, alarm indication device,

[0035] 150, control system,

[0036] 160, paper state detection device,

[0037] 170, high-speed camera,

[0038] 200, pulp plate. EMBODIMENT

[0039] In order to explain the possible application scenarios, technical principles, specific schemes that can be implemented, purposes and effects that can be achieved, etc. of the present application in detail, the following will be described in detail in combination with the specific embodiments listed and the accompanying drawings. The embodiments described in this paper are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0040] The term "embodiment" is mentioned in this document means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in this application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0041] Unless otherwise defined, the meaning of technical terms used in this document is the same as that generally understood by those skilled in the art to which the present application belongs; the use of related terms in this document is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0042] In the description of the present application, the phrase "and / or" is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this document generally represents that the associated objects before and after are a "or" logical relationship.

[0043] In this application, such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary and secondary or order relationship between them.

[0044] In this application, without more limitation, the "include", "contain", "have" or other similar expressions used in the sentence are intended to cover non-exclusive inclusion, and these expressions do not exclude the presence of other elements in the process, method or product including the described elements, so that the process, method or product including a series of elements can not only include those limited elements, but also include other elements not explicitly listed, or also include the elements inherent in such process, method or product.

[0045] As the same as the understanding in the "Guidelines for Examination", in this application, "greater than", "less than", "exceed" and other expressions are understood as not including the number; "above", "below", "within" and other expressions are understood as including the number. In addition, the meaning of "multiple" in the description of the embodiments of the present application is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times" and the like, unless otherwise explicitly limited.

[0046] In the description of the embodiments of the present application, the spatial relative expressions, such as "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or the drawings, and are only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and do not indicate or imply that the indicated device or component must have a particular position, a particular orientation, or be constructed or operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0047] Unless otherwise explicitly specified or limited, in the description of the embodiments of the present application, the terms "mount", "connect", "connect", "fix", "set", and the like should be understood broadly. For example, the "connection" can be fixed connection, or detachable connection, or integral setting; it can be mechanical connection, or electrical connection, or communication connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0048] Please refer to Figures 1-3 The air cushion drying box of the paper machine according to the embodiment comprises:

[0049] The box body 110 is provided with a drying layer 111 and a cold air layer 112 inside, the drying layer 111 is arranged on the top of the cold air layer 112, the drying layer 111 is connected to the inlet of the box body 110, and the cold air layer 112 is connected to the outlet of the box body 110;

[0050] The turning roller set is a plurality of sets, each turning roller set comprises two turning rollers 121 arranged alternately on both sides of the box body, and the turning roller set is used for conveying the pulp board 200 in the drying layer 111 and the cold air layer 112 in the box body 110 in an S shape;

[0051] The paper break detection device 130 is a plurality of sets, the paper break detection device 130 is arranged between the two turning rollers 121 of the turning roller set, and the paper break detection device 130 is used for detecting whether the pulp board 200 between each turning roller set breaks;

[0052] The alarm indicating device 140 is a plurality of sets, and each set of the alarm indicating device 140 corresponds to each set of the paper break detection device 130;

[0053] A control system 150 connected to the alarm indicating device 140 and the paper break detection device 130.

[0054] By setting the paper break detection device 130 between the two deflection rollers 121 of each deflection roller group in the box body 110 of the air cushion drying box, when the pulp board 200 is dried in the drying layer 111 and the cold air layer 112 of the air cushion drying box by passing through the deflection roller group, the paper break detection device 130 between each deflection roller group detects the paper break of the pulp board 200 in the conveying process. When the paper break of the pulp board 200 is detected, the control system 150 controls the corresponding alarm indicating device 140 to issue an alarm prompt according to the paper break detection device 130 that detects the paper break. The paper break detection system composed of the paper break detection device 130, the alarm indicating device 140 and the control system 150 can realize the paper break detection of the pulp board in the drying box and the alarm, so that the staff can know the paper break in the air cushion drying box and the position of the paper break in time, and can handle it in time to avoid the paper break causing the paper jam and reduce the serious impact on the paper leading and paper tail cleaning.

[0055] Please refer to Figure 4 In some embodiments, a paper state detection device 160 is further included, which is arranged at the entrance of the box body 110 and connected to the control system 150. The paper state detection device 160 is used to detect the state of the paper entering the box body 110.

[0056] By arranging the paper state detection device 160 at the entrance of the box body 110, the state of the pulp board 200 entering the box body 110 is detected. If the pulp board 200 is detected to enter the box body 110, the control system 150 detects whether the pulp board 200 in the box body 110 has paper break by the paper break detection device 130. If the pulp board 200 is not detected to enter the box body 110, the control system 150 stops the paper break detection device 130 from working.

[0057] In some embodiments, the paper break detection device 130 is a photoelectric detection switch or a reflective infrared sensor or a machine vision paper break detection device 130. When the paper break detection device 130 is a photoelectric detection switch, photoelectric detection switches are arranged on both sides of the pulp board 200 layer. When the pulp board 200 does not have a paper break, the light of the photoelectric detection switch is blocked by the pulp board 200. However, when the pulp board 200 has a paper break, the light of the photoelectric detection switch is not blocked by the pulp board 200. Whether the light of the photoelectric detection switch is blocked or not is detected to determine whether the pulp board 200 has a paper break. When a reflective infrared sensor is used, whether the pulp board 200 has a paper break is determined according to the reflection of infrared light on the surface of the pulp board 200. When the machine vision paper break detection device 130 is used, the machine vision paper break detection device 130 uses a high-performance color sensor and a high-intensity LED optical element to detect a paper break in the shortest time. For example, VISI LT100 infrared sensors or VISI110 RGB sensors are used. The VISI110 RGB sensor is based on RGB paper break detection and uses a multi-color optical measurement principle to work in a high-humidity, high-temperature and foggy environment.

[0058] Please refer to Figure 4 In some embodiments, the paper break detection device 130 further comprises:

[0059] The high-speed camera 170 is a plurality of groups, and the high-speed camera 170 is arranged between the two deflection rollers 121 of each group of deflection rollers. The high-speed camera 170 is used to take pictures of the pulp board 200 between each group of deflection rollers.

[0060] When a paper break occurs during normal operation, the paper break detection device 130 detects the paper break, and the corresponding alarm indicating device 140 issues an alarm prompt. The staff can locate and monitor through the high-speed camera 170, view the video playback, and analyze the paper break reason.

[0061] In some embodiments, the alarm indicating device 140 is an alarm flash. The alarm indicating device 140 can use an alarm flash. When the paper break detection device 130 detects a paper break, the corresponding alarm flash of the alarm indicating device 140 flashes to remind the staff. In other embodiments, the alarm indicating device 140 can also use an alarm buzzer. When the paper break detection device 130 detects a paper break, the corresponding alarm buzzer of the alarm indicating device 140 issues an alarm prompt sound to remind the staff.

[0062] In some embodiments, the drying layer 111 has 27 layers, and the cooling air layer 112 has 2 layers. The pressed wet pulp board 200, with a dryness of approximately 50%, enters from the top of the oven and passes through the 27 drying layers 111 sequentially. Using hot air as a cushion, it passes through the upper and lower air chambers of each layer under the force of rollers, undergoing a serpentine drying and dehydration process from top to bottom. Next, the dried, high-temperature pulp board 200 is cooled and shaped in the last two layers at the bottom of the dryer. Finally, the cooled pulp board 200 is discharged from the cooling layer, passes through the guide rollers and traction device, and enters the paper cutting section. After drying, the pulp board 200 has a dryness of 90% and a width of 4.8m. The pulp board 200 in the cooling layer also undergoes air-cushion drying. Cold air at approximately 30°C is blown onto the pulp board 200, lowering its temperature to approximately 42°C.

[0063] In some embodiments, a transition layer is provided between the drying layer 111 and the cooling layer 112 inside the housing 110. The cooling layer is generally an independent unit in the oven, and there is a transition zone between it and the upper drying layer 111 to prevent condensation. The purpose is to reduce yellowing of the pulp board 200 during storage, prevent condensation from forming on the pulp board 200 due to high temperatures during storage and transportation, extend the life of the flying knife, and make the pulp board 200 more uniform.

[0064] In some embodiments, a plurality of paper break detection devices 130 are provided at intervals between the two steering rollers 121 of the steering roller group. For example... Figure 5 The schematic diagram of the paper breakage detection device 130 shown shows that multiple detection points are set between each group of guide rollers, and a paper breakage detection device 130 is installed at each detection point. By setting multiple paper breakage detection devices 130 at intervals between the two guide rollers 121 of the guide roller group, it is possible to more accurately detect which position of which pulp board 200 layer has a paper breakage.

[0065] In some embodiments, a paper state detection device 160 is installed at the entrance of the drying chamber of the pulp board 200. After the paper is broken, the corresponding outer drying layer 111 will have a paper breakage light to indicate the breakage. Each other layer has the same detection device, for a total of 29 layers / sets.

[0066] When the paper breakage detection device 130 detects a paper break during the paper feeding process, the corresponding paper breakage alarm light will flash to indicate that the paper breakage occurred at that location. This can quickly alert staff to enter the area to clean up the paper tail, greatly improving the efficiency of the paper feeding process.

[0067] If a paper breakage occurs during normal production, the corresponding paper breakage alarm light will flash immediately, and the high-speed camera will be used to monitor the location. The computer will then review the video playback to analyze the cause of the paper breakage.

[0068] The paper breakage position can be located specifically, and the paper tail residue of each drying layer can be detected comprehensively through video recording;

[0069] When paper breakage occurs in each drying layer, the position can be located quickly, and an audible and visual alarm can be sent to timely remind the production process operator to clean the paper tail in time;

[0070] Compared with the air cushion drying box without the paper breakage detection system, the paper leading speed can be greatly improved from 4-8 hours to 2-4 hours, and the paper leading time is shortened by about 50%.

[0071] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of the present application, the patent protection scope of the present application should not be limited. Any technical solution obtained by replacing or modifying the equivalent structure or equivalent process based on the essential concept of the present application, using the content described in the specification and drawings of the present application, and directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, etc. are all included in the patent protection scope of the present application.

Claims

1. An air-cushion drying box for a papermaking machine, characterized in that, include: The enclosure includes a drying layer and a cold air layer. The drying layer is located on top of the cold air layer and is connected to the inlet of the enclosure. The cold air layer is connected to the outlet of the enclosure. The guide roller group consists of multiple guide roller groups, each group including two guide rollers that are staggered on both sides of the housing. The guide rollers are used to transport the slurry plate in an S-shape within the drying layer and the cold air layer. A paper breakage detection device, comprising multiple sets, is provided and positioned between two guide rollers of a guide roller set. The paper breakage detection device is used to detect whether a paper breakage occurs in the pulp board between each set of guide rollers. An alarm indicator device, wherein there are multiple alarm indicator devices, each corresponding to one of the paper breakage detection devices; A control system is connected to the alarm indicator and the paper breakage detection device.

2. The air-cushion drying box for a papermaking machine according to claim 1, characterized in that, It also includes a paper state detection device, which is located at the entrance of the box and connected to the control system. The paper state detection device is used to detect the state of the paper entering the box.

3. The air-cushion drying box for a papermaking machine according to claim 1, characterized in that, The paper breakage detection device is a photoelectric detection switch, a reflective infrared sensor, or a machine vision paper breakage detection device.

4. The air-cushion drying oven for a papermaking machine according to claim 1, characterized in that, Also includes: The high-speed camera consists of multiple sets, each set between two steering rollers in each set of steering rollers. The high-speed camera is used to capture images of the slurry plate between each set of steering rollers.

5. The air-cushion drying box for a papermaking machine according to claim 1, characterized in that, The alarm indicator is an alarm flashing light.

6. The air-cushion drying box for a papermaking machine according to claim 1, characterized in that, The drying layer has 27 layers, and the cold air layer has 2 layers.

7. The air-cushion drying box for a papermaking machine according to claim 1, characterized in that, The box also has a transition layer between the drying layer and the cold air layer.

8. The air-cushion drying oven for a papermaking machine according to claim 1, characterized in that, Multiple paper break detection devices are spaced apart between the two steering rollers of the steering roller group.

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