Pulp machine top net transmission device, clamp net former and pulp machine

Abstract

The utility model discloses a pulp machine top net transmission device, a clamping net forming device and a pulp machine, the pulp machine top net transmission device comprises an upper breast roll, a transmission roll assembly, a net guide roll and a tensioning roll, the upper breast roll is located at an inlet of the pulp machine, the transmission roll assembly is used for driving a top net to transmit, the net guide roll is used for guiding movement of the top net, and the tensioning roll is located at an outlet of the pulp machine. And the tensioning roller is used for tensioning the top net. According to the top net transmission device of the pulp machine, a double-transmission mode is changed into a single-transmission mode, top net transmission is changed into cooperative driving of the first driving roller and the driven roller from synchronous driving of the first driving roller and the second driving roller, the driven roller in passive transmission absorbs energy fluctuation in the operation process of the top net, energy superposition in the double-transmission mode is eliminated, and the transmission efficiency of the top net is improved. The problem that tension generated when the top net is located between the first driving roller and the second driving roller in a double-transmission mode is concentrated is solved, impact on the top net seam due to sudden change of tension is avoided, top net tearing is avoided, and normal operation of a pulp board workshop is guaranteed.

Description

Technical Field

[0001] This application relates to the field of pulp and paper production technology, and in particular to a top wire transmission device for a pulp board machine, a wire clamping forming device, and a pulp board machine. Background Technology

[0002] The pulping machine wire section includes a top wire and a bottom wire. The top wire is the part of the pulping machine used to carry and transport pulp. The top wire adopts a dual drive system with two first drive rollers, which drive the top wire simultaneously.

[0003] The top wire, which uses a dual-drive system, is frequently torn and damaged. In just six months, more than ten sheets of top wire have been damaged. This not only increases the production cost of pulp, but also requires machine shutdown for replacement after the top wire is damaged, reducing the production efficiency of the pulp board car and affecting the output of the entire pulp line.

[0004] Therefore, how to solve the problem of top mesh tearing in order to ensure the normal operation of the pulp board workshop has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] This application proposes a top mesh transmission device for a pulping machine to solve the problem of top mesh tearing and ensure the normal operation of the pulping workshop. This application also provides a mesh clamping forming device and a pulping machine.

[0006] To achieve the above objectives, this application provides a top net transmission device for a paddleboard machine, comprising an upper chest roller, a transmission roller assembly, a guide roller, and a tension roller arranged along the movement direction of the top net.

[0007] The upper chest roller is located at the feed inlet of the pulping machine; the drive roller assembly drives the top net transmission; the guide roller guides the movement of the top net; and the tension roller tensions the top net.

[0008] The transmission roller assembly includes a first driving roller and a driven roller. The first driving roller is located upstream of the driven roller and is used to drive the top net to move. The driven roller, the guide roller, the tension roller, and the upper chest roller are driven by the top net.

[0009] Preferably, in the above-mentioned top net drive device of the pulping machine, the output torque of the first drive roller is matched with the speed of the pulping machine to reduce the vibration of the pulping machine.

[0010] Preferably, in the above-mentioned paddleboard machine top net transmission device, the upper chest roller, the first drive roller, the guide roller and the tension roller are located inside the top net, and the transmission roller is located outside the top net.

[0011] Preferably, in the above-mentioned pulp machine top net transmission device, the driven roller is located between the first driving roller and the guide roller, close to the first driving roller.

[0012] Preferably, in the above-mentioned plywood machine top net transmission device, the distance between the outer edge of the first driving roller and the outer edge of the driven roller is at least 20cm.

[0013] Preferably, the above-mentioned top net transmission device of the pulp machine also includes a backup motor, which is used to connect to the first active roller when the motor of the first active roller fails.

[0014] Preferably, in the above-mentioned paddleboard machine top net transmission device, the upper chest roller is a steel roller, and the upper chest roller is covered with a rubber layer.

[0015] A mesh forming device includes a top mesh transmission device for a pulping machine, wherein the top mesh transmission device for a pulping machine is the top mesh transmission device for a pulping machine described in any of the above embodiments.

[0016] Preferably, in the above-mentioned mesh forming device, the first driving roller of the top mesh transmission device of the pulping machine and the driven roller of the top mesh transmission device of the pulping machine have the same structure.

[0017] A pulping machine includes a mesh forming device, wherein the mesh forming device is the mesh forming device described in any of the above embodiments.

[0018] The top netting transmission device for a pulping machine provided in this application includes an upper chest roller, a transmission roller assembly, a guide roller, and a tension roller arranged sequentially along the movement direction of the top netting. The upper chest roller is located at the inlet of the pulping machine. The transmission roller assembly drives the top netting transmission, the guide roller guides the movement of the top netting, and the tension roller tensions the top netting. This disclosed top netting transmission device replaces the second driving roller with a driven roller, changing the dual-drive mode to a single-drive mode. The top netting transmission changes from synchronous driving of the first and second driving rollers to coordinated driving of the first driving roller and the driven roller. The passively driven roller absorbs energy fluctuations during top netting operation, eliminating energy superposition under the dual-drive mode. This avoids the tension concentration problem caused by the top netting being located between the first and second driving rollers under the dual-drive mode, solves the impact on the top netting seams due to sudden tension changes, prevents top netting tearing, and ensures the normal operation of the pulping workshop.

[0019] This solution also discloses a mesh clamping forming device, including the top mesh transmission device of the pulping machine described in any of the above solutions. Since the top mesh transmission device has the above-mentioned technical effects, the mesh clamping forming device with the top mesh transmission device of the pulping machine also has the same technical effects, and will not be described in detail here.

[0020] This solution also discloses a pulping machine, including a wire mesh forming device, which is the wire mesh forming device disclosed in any of the above solutions. Since the wire mesh forming device has the above-mentioned technical effects, the pulping machine with the wire mesh forming device also has the same technical effects, and will not be described in detail here. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort, and this application can be applied to other similar scenarios based on the provided drawings. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0022] Figure 1 This is a schematic diagram of the top net transmission device of the pulp machine in this scheme;

[0023] Figure 2 This is a comparison chart of the lifespan of the top mesh of the pulp machine top mesh transmission device disclosed in this solution and the lifespan of the top mesh of related technologies.

[0024] The attached diagram is described below:

[0025] 1-Upper chest roller; 2-Drive roller assembly; 21-First driving roller; 22-Driven roller; 3-Guide roller; 4-Tension roller; 5-Top net; 6-Lower chest roller; 7-Bottom net tension roller; 8-Bottom net correction roller; 9-Bottom net correction roller; 10-Bottom net. Detailed Implementation

[0026] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. The described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.

[0027] It should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in these embodiments can be arbitrarily combined, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features.

[0028] 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.

[0029] 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.

[0030] The headbox outlet is located in the wedge-shaped zone between the top and bottom screens of the mesh forming machine. The slurry is sprayed into the wedge-shaped zone, and by adjusting the slurry spray angle, most of the slurry falls onto the lower breast roller, while the remaining slurry falls onto the upper breast roller. The pressure formed between the top and bottom screens in the wedge-shaped zone gradually increases, and the slurry suspension dewaters rapidly and undisturbed on both sides of the top and bottom screens. The driving force for slurry dewatering is the pressure in the wedge-shaped zone.

[0031] In related technologies, the top net transmission structure includes an upper chest roller, a first active roller, a second active roller, a guide roller, and a tension roller. The first and second active rollers drive the top net, which is a dual transmission mode. The upper chest roller, guide roller, and tension roller are driven to operate by the top net.

[0032] The bottom netting drive device includes a lower chest roller 6, a bottom netting tension roller 7, a bottom netting alignment roller 8, and a bottom netting drive roller 9. These components are arranged along the transmission direction of the bottom netting. The lower chest roller 6 corresponds to the upper chest roller 1. The bottom netting tension roller 7 is located below the lower chest roller 6. The bottom netting alignment roller 8 is located between the bottom netting tension roller 7 and the bottom netting drive roller 9. The bottom netting drive roller 9 drives the bottom netting 10. Optionally, the bottom netting drive roller 9 can adopt a dual-drive mode.

[0033] During operation, the top screen drive structure rotates synchronously with the first and second drive rollers. Due to the close distance between the first and second drive rollers, the rotational energy of the first and second drive rollers cannot be fully released within this short distance. This results in uneven force distribution on the top screen between the first and second drive rollers, which can easily cause the top screen to tear. The tearing mainly occurs between the first and second drive rollers, leading to frequent top screen replacements, disruption of the pulp board workshop's normal operation, and impact on the overall pulp production line's output. At the same time, it also causes significant wear on the first and second drive rollers.

[0034] In related technologies, more than ten of the two production lines of the dual-drive pulping machine suffered damage to their top screens within seven months. The service life of the top screens ranged from 3 to 80 days, with an average service life of 35.2 days.

[0035] As shown in the table below,

[0036] PD2 & PD3 Computer time Disembarkation time Lifespan (days) PD2 4 / 27 / 2010 5 / 18 / 2010 21 PD2 5 / 18 / 2010 6 / 1 / 2010 14 PD2 6 / 1 / 2010 6 / 4 / 2010 3 PD2 6 / 4 / 2010 6 / 16 / 2010 12 PD2 6 / 18 / 2010 7 / 20 / 2010 32 PD2 7 / 21 / 2010 8 / 17 / 2010 27 PD2 8 / 17 / 2010 9 / 17 / 2010 31 PD2 9 / 18 / 2010 12 / 3 / 2010 76

[0037] (Continued from the table above)

[0038] PD3 5 / 10 / 2010 7 / 17 / 2010 68 PD3 7 / 18 / 2010 8 / 20 / 2010 33 PD3 8 / 20 / 2010 11 / 4 / 2010 76 PD3 11 / 4 / 2010 12 / 4 / 2010 30 average 35.20

[0039] See Figure 1 The diagram below shows the structure of the top net transmission device of the pulping machine disclosed in this solution. The top net transmission device of the pulping machine includes an upper chest roller 1 (also known as a forming roller), a transmission roller assembly 2, a guide roller 3, and a tension roller 4 arranged sequentially along the movement direction of the top net 5. The upper chest roller 1 is located at the inlet of the pulping machine. The transmission roller assembly 2 is used to drive the top net 5. The guide roller 3 is used to guide the movement of the top net 5. The tension roller 4 is used to tension the top net 5.

[0040] The transmission roller assembly 2 of this scheme includes a first driving roller 21 and a driven roller 22. The driven roller 22 is located downstream of the first driving roller 21. The first driving roller 21 is connected to a motor through a coupling. The motor drives the first driving roller 21 to move. The first driving roller 21 drives the top net 5 to move. The top net 5 drives the driven roller 22, the guide roller 3, the tension roller 4 and the upper chest roller 1 to move.

[0041] The top net transmission device of the pulping machine disclosed in this solution replaces the second active roller with the driven roller 22, and changes the top net transmission device from a dual-drive mode to a single-drive mode. The transmission of the top net 5 changes from synchronous drive of the first active roller 21 and the second active roller to coordinated drive of the first active roller 21 and the driven roller 22. The passively driven roller 22 absorbs the energy fluctuations during the operation of the top net 5, eliminates the energy superposition in the dual-drive mode, avoids the tension concentration problem caused by the top net 5 when it is located between the first active roller 21 and the second active roller in the dual-drive mode, solves the impact of sudden tension on the joint of the top net 5, avoids tearing of the top net 5, and ensures the normal operation of the pulping workshop.

[0042] After the top screen 5 adopts the top screen transmission device of the pulping machine disclosed in this solution, the service life of the top screen 5 is significantly extended to 90-140 days, with an average service life of 105 days. The extended service life of the top screen 5 reduces downtime caused by tearing, leading to more stable production and increased output of the pulping machine. See the table below:

[0043] PD2 & PD3 Computer time Disembarkation time Lifespan (days) PD2 12 / 3 / 2010 4 / 1 / 2011 119 PD2 4 / 1 / 2011 5 / 12 / 2011 41 PD2 5 / 12 / 2011 9 / 25 / 2011 136 PD2 9 / 25 / 2011 12 / 29 / 2011 95 PD2 12 / 30 / 2011 3 / 28 / 2012 89 PD2 3 / 28 / 2012 9 / 4 / 2012 160 PD2 9 / 4 / 2012 12 / 4 / 2012 91 PD2 12 / 4 / 2012 3 / 25 / 2013 111 PD2 3 / 25 / 2013 8 / 9 / 2013 137 PD2 8 / 9 / 2013 1 / 15 / 2014 159 PD2 1 / 16 / 2014 5 / 22 / 2014 126 PD3 12 / 4 / 2010 5 / 12 / 2011 159 PD3 5 / 12 / 2011 6 / 12 / 2011 31 PD3 6 / 12 / 2011 9 / 10 / 2011 90 PD3 9 / 10 / 2011 12 / 1 / 2011 82 PD3 12 / 1 / 2011 2 / 13 / 2012 74 PD3 2 / 13 / 2012 5 / 7 / 2012 84 PD3 5 / 7 / 2012 9 / 5 / 2012 121 PD3 9 / 12 / 2012 12 / 3 / 2012 82

[0044] (Continued from the table above)

[0045] PD3 12 / 3 / 2012 3 / 25 / 2013 112 PD3 3 / 25 / 2013 8 / 9 / 2013 137 PD3 8 / 9 / 2013 9 / 13 / 2013 35 PD3 9 / 13 / 2013 1 / 15 / 2014 124 PD3 1 / 16 / 2014 5 / 22 / 2014 126 average 105

[0046] like Figure 2 As shown, the service life of the top screen 5 has been extended to three times that of the original, and it is estimated that the net cost of the top screen 5 can be reduced by 3 million yuan per year. In addition, the motor of the original second active roller can be used as a backup motor, which can save 2 million yuan in costs, providing a strong guarantee for the trial operation of the workshop.

[0047] The extended service life of the top screen 5 stabilized the production of the pulping machine, reduced the downtime of replacing the top screen 5 by 10 hours during the trial production period, and increased the annual output by 160 hours, resulting in an additional 16,000 tons of output and an increase in sales revenue of 72 million yuan.

[0048] The proposed solution discloses a top net transmission device for a pulping machine that removes the original coupling of the second active roller from the motor, making the second active roller the driven roller 22. This reduces the modification cost of the top net transmission device for the pulping machine by utilizing the original second active roller of the pulping machine as the driven roller 22.

[0049] The top net transmission device of the pulping machine disclosed in this solution eliminates the coupling, and the second driving roller becomes the driven roller 22, but still retains all the original functions. Moreover, it achieves the effect of eliminating the tension concentration problem when the top net 5 is located between the first driving roller 21 and the second driving roller, and solves the long-standing problem of top net 5 tearing in the industry.

[0050] Under high-speed (>190m / min) conditions, the passive support of the driven roller 22 and the variable frequency speed regulation of the driving roller work together to suppress frame vibration and ensure dynamic stability in single-drive mode. This solution achieves energy dissipation through passive modification of the mechanical structure without the need for additional control system intervention, resulting in significant technical benefits and a simple and efficient technical approach.

[0051] The top net transmission device for the pulp machine disclosed in this solution solves the tension concentration problem by switching transmission modes, which has significant novelty and industrial applicability.

[0052] The paddleboard machine top net drive device disclosed in this solution controls the global tension distribution through a single drive and achieves dynamic load distribution by combining an AC frequency conversion control system, ensuring that the top net 5 operates stably within the speed range of 80 m / min - 250 m / min.

[0053] The mechanical inertia of the driven roller 22 counteracts the centrifugal force fluctuations of the net during high-speed operation. The AC frequency conversion control system dynamically adjusts the torque output of the first active roller 21 to match the speed changes, solving the vibration problem in the high-speed range of the single transmission mode and expanding the stability of the original design speed range (80 m / min - 250 m / min).

[0054] The proposed solution discloses a low-cost modification method for the top net transmission device of the pulping machine, which can achieve performance optimization simply by removing the transmission components and adjusting the control system parameters.

[0055] like Figure 1 As shown, the upper chest roller 1, the first drive roller 21, the guide roller 3, and the tension roller 4 are located inside the top net 5, while the drive roller is located outside the top net 5. The upper chest roller 1 and the first drive roller 21 press the top net 5 together, the guide roller 3 and the tension roller 4 support the top net 5, and the drive roller presses the top net 5 together, enhancing the cooperation between the top net 5 and the first drive roller 21 and ensuring that the top net 5 can be effectively conveyed.

[0056] like Figure 1 As shown, the driven roller 22 is located between the first driving roller 21 and the guide roller 3, and the driven roller 22 is closer to the first driving roller 21, which improves the reliability of the operation of the driven roller 22.

[0057] In related technologies, the distance between the first driving roller 21 and the second driving roller is 20cm. In this solution, the distance between the first driving roller 21 and the driven roller 22 can also be maintained at 20cm, or it can be adjusted as needed, with the distance between the first driving roller 21 and the driven roller 22 being greater than 20cm. It should be noted here that the distance between the first driving roller 21 and the driven roller 22 is not the distance between the axis of the first driving roller 21 and the axis of the driven roller 22, but rather the distance between the outer edge of the first driving roller 21 and the outer edge of the driven roller 22.

[0058] In related technologies, the second drive roller is driven by a motor. After the coupling between the motor and the second drive roller is disassembled, the motor used to drive the second drive roller is freed up. The motor driving the second drive roller can be removed and used as a backup motor for the top mesh drive device of the pulping machine or the entire pulping machine, forming a redundancy backup scheme. It can be quickly replaced in case of failure of other transmission systems, shortening downtime and reducing maintenance costs.

[0059] Based on historical data of tearing failures in TopNet 5 (more than 10 failures in six months), a life prediction model based on a single drive mode was established to guide the optimization of maintenance cycles.

[0060] This solution is the first to combine transmission system modification with a redundancy backup strategy, forming a reusable equipment management method.

[0061] The upper chest roller 1 is a steel roller, and the upper chest roller 1 is covered with a rubber layer. The above-mentioned structural design of the upper chest roller 1 not only ensures the strength of the upper chest roller 1, but also ensures the friction between the upper chest roller 1 and the top net 5.

[0062] In addition, steel rollers are low in cost, which reduces the cost of the top mesh transmission device of the pulping machine to some extent.

[0063] The proposed method for modifying the top mesh transmission device of the pulping machine is as follows:

[0064] This includes disassembling the coupling of the second drive roller located downstream of the first drive roller 21 so that the second drive roller forms the driven roller 22.

[0065] The modification method of the top net drive device of the pulping machine is to modify the second active roller into a driven roller 22. The top net drive device of the pulping machine obtained by the modification method is changed from a dual drive mode to a single drive mode. The drive of the top net 5 is changed from synchronous drive of the first active roller 21 and the second active roller to cooperative drive of the first active roller 21 and the driven roller 22. The passively driven roller 22 absorbs the energy fluctuations in the operation of the top net 5, eliminates the energy superposition in the dual drive mode, avoids the tension concentration problem caused by the top net 5 when it is located between the first active roller 21 and the second active roller, solves the impact of the sudden tension on the joint of the top net 5, avoids the tearing of the top net 5, and ensures the normal operation of the pulping workshop.

[0066] The modification method of the top net drive device of the pulp machine also includes disassembling the motor of the second drive roller as a backup motor to form a redundant backup scheme. This can be quickly replaced when other drive systems fail, shortening downtime and reducing maintenance costs.

[0067] This solution is the first to combine transmission system modification with a redundancy backup strategy, forming a reusable equipment management method.

[0068] The modification method of the top net drive device of the pulping machine also includes adjusting the output torque of the first active roller 21 to match the speed of the pulping machine in order to reduce the vibration of the pulping machine.

[0069] The mechanical inertia of the driven roller 22 counteracts the centrifugal force fluctuations of the net during high-speed operation. The AC frequency conversion control system dynamically adjusts the torque output of the first active roller 21 to match the speed changes, solving the vibration problem in the high-speed range of the single transmission mode and expanding the stability of the original design speed range (80m / min-250m / min).

[0070] The proposed solution discloses a low-cost modification method for the top net transmission device of the pulping machine, which can achieve performance optimization simply by removing the transmission components and adjusting the control system parameters.

[0071] This solution also discloses a mesh clamping forming device, including the top mesh drive device for the above-mentioned pulping machine described in any of the above solutions. Since the top mesh drive device has the above-mentioned technical effects, the mesh clamping forming device with the top mesh drive device of the pulping machine also has the same technical effects, and will not be described in detail here.

[0072] This solution also discloses a pulping machine, including a wire mesh forming device, which is the wire mesh forming device disclosed in any of the above solutions. Since the wire mesh forming device has the above-mentioned technical effects, the pulping machine with the wire mesh forming device also has the same technical effects, and will not be described in detail here.

[0073] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed, and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. The scope of this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described application concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A top net transmission device for a pulp board machine, characterized in that, It includes an upper chest roller (1), a transmission roller assembly (2), a guide roller (3), and a tension roller (4) arranged along the movement direction of the top net (5). The upper chest roller (1) is located at the feed inlet of the pulping machine, the transmission roller assembly (2) is used to drive the top net (5) transmission, the guide roller (3) is used to guide the movement of the top net (5), and the tension roller (4) is used to tension the top net (5). The transmission roller assembly (2) includes a first driving roller (21) and a driven roller (22). The first driving roller (21) is located upstream of the driven roller (22). The first driving roller (21) is used to drive the top net (5) to move. The driven roller (22), the guide roller (3), the tension roller (4) and the upper chest roller (1) are driven by the top net (5).

2. The top net transmission device for a pulp machine according to claim 1, characterized in that, The output torque of the first drive roller (21) is matched with the speed of the pulping machine to reduce the vibration of the pulping machine.

3. The top net transmission device for a pulp machine according to claim 1, characterized in that, The upper chest roller (1), the first active roller (21), the guide roller (3) and the tension roller (4) are located inside the top net (5), and the transmission roller is located outside the top net (5).

4. The top net transmission device for the pulp machine according to any one of claims 1-3, characterized in that, The driven roller (22) is located between the first driving roller (21) and the guide roller (3), close to the first driving roller (21).

5. The top net transmission device for a pulp machine according to claim 4, characterized in that, The distance between the outer edge of the first driving roller (21) and the outer edge of the driven roller (22) is at least 20 cm.

6. The top net transmission device for the pulp machine according to any one of claims 1-3, characterized in that, It also includes a backup motor for connecting to the first drive roller (21) in case of motor failure of the first drive roller (21).

7. The top net transmission device for a pulp machine according to claim 1, characterized in that, The upper chest roller (1) is a steel roller, and the upper chest roller (1) is covered with a rubber layer.

8. A mesh forming device, characterized in that, Includes a top net drive device for a pulping machine, wherein the top net drive device for a pulping machine is the same as any one of claims 1-7.

9. The mesh forming device according to claim 8, characterized in that, The first driving roller (21) of the top net drive device of the pulp machine and the driven roller (22) of the top net drive device of the pulp machine have the same structure.

10. A pulping machine, characterized in that, Includes a mesh forming device, wherein the mesh forming device is the mesh forming device as described in claim 8 or 9.

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