Adjusting device for suction roller of fiber web machine
By using motor-driven moving screws and sliding bar systems in the fiber web machine suction roller, combined with sensors, the problems of complexity and low accuracy of the existing adjustment system are solved, and accurate and rapid adjustment and position determination are achieved, improving The reliability and sensitivity of the system.
Patent Information
- Application Number
- CN202420234812.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2023-02-14
- Filing Date
- 2024-01-30
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-01-30
AI Technical Summary
The existing fiber web machine suction roller adjustment system is designed in complex, requiring a lot of installation space, making it difficult to manufacture and install, with low adjustment accuracy and easy to get stuck, and the liquid-driven cylinder has problems of liquid leakage and poor adjustment accuracy.
Using a motor-equipped motion screw as an actuator, connected to the end seal through a sliding bar and a sliding guide, precise adjustment is achieved using the conveyor arm and the T-shaped sliding bar, and equipped with sensors to determine the position of the end seal, avoiding the Defects in liquid-driven cylinders.
A more accurate and reliable adjustment system is realized, reducing installation space requirements, avoiding jamming, improving adjustment accuracy and speed, and enabling remote control, robust components and position determination.
Smart Images
Figure CN222226932U_ABST
Abstract
Description
Technical Field
[0001] The object of the invention is an adjustment device for a suction roll of a fiber web machine, the suction roll comprising a movably adapted end seal connected to an actuator assigned to the adjustment device, the actuator being arranged in the suction roll. Background Art
[0002] Fiber web machines have different suction rolls. The suction roll has a perforated shell in which a suction box is arranged. At least one suction zone is arranged in the suction roll in which the negative pressure effect of the suction box extends to the surface of the shell via the holes in the shell. The suction zone is limited by a seal extending to the inner surface of the shell. More precisely, the suction zone is defined by two axial seals, between which an end seal is arranged. In order to adapt the width of the suction zone to various production situations, the end seals are adjustable. In other words, the position of the two end seals can be adjusted in the axial direction of the suction roll. For this purpose, the suction roll is equipped with an adjustment system.
[0003] The current adjustment system is based on a lever arm, which is used via an adjustment nut present on a baffle at the end of the suction roll. The design of the adjustment system is complex and bulky and requires a large installation space in the suction roll. In addition, the manufacture and installation of the adjustment system are cumbersome. In practice, the adjustment accuracy still has room for improvement and the adjustment system is prone to jamming, which may completely prevent adjustment.
[0004] US patent 3395073 proposes an adjustment system in which the end seal moves with a liquid-driven cylinder. The piston rod of the cylinder, which is fitted in the suction roll, is mechanically connected to the end seal. The mechanical connection causes skew loading on the end seal. Furthermore, the cylinder requires a large installation space and liquid leakage is detrimental to the function of the suction roll and the production of the fiber web machine. The adjustment accuracy of the liquid-driven cylinder is poor and the cylinder must have a continuous pressure to keep the end seal in place. Furthermore, the corresponding position of the end seal is not determined. Utility Model Content
[0005] The object of the present invention is to provide a new adjustment system for a suction roll of a fiber web machine, which is more accurate and more reliable than previous adjustment systems, but simpler. The features corresponding to the adjustment system of the present invention will be given by the technical solution according to the present invention. The adjustment system according to the present invention is suitable for application in various suction rolls and end seals. The adjustment system can work accurately and reliably without the problems encountered in the prior art. In addition, the components of the adjustment system are robust and the position of the end seal is accurately known at any time. In addition to precision, the adjustment can also be carried out quickly, even remotely.
[0006] The utility model provides an adjusting device for a suction roller of a fiber web machine, wherein the suction roller comprises a movably adapted end sealing member, an actuator assigned to the adjusting device is connected to the end sealing member, the actuator is arranged in the suction roller, and the actuator is a moving screw equipped with a motor.
[0007] In some embodiments, a nut assigned to the moving screw is connected to the end seal via a sliding bar on which a sliding guide is adapted to be attached to a suction roll.
[0008] In some embodiments, there are two or more slide bars, and the slide bars are connected to each other by a conveying arm, and the nut is adapted on the conveying arm.
[0009] In some embodiments, the cross section of the sliding bar is T-shaped, a corresponding T-shaped groove is arranged on the sliding guide, and the sliding guide is made of different materials.
[0010] In some embodiments, the suction roller comprises a suction box, and the movement screw and the motor are supported on a cover assigned to the suction box.
[0011] In some embodiments, the actuator comprises a sensor to define the position of the end seal in the axial direction. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The utility model is described in detail below with reference to the accompanying drawings of some applications of the utility model.
[0013] Figure 1 The pressing position of the fiber web position is shown, in which the control system according to the invention is arranged in the suction roll present at the pressing position.
[0014] Figure 2a shows a cross section of another type of suction roll,
[0015] Figure 2b The adjustment system according to the invention, adapted to a suction roll, is shown viewed in the machine direction.
[0016] Figure 2c Shows Figure 2b A partial enlarged view of
[0017] Figure 2d Shows the different locations of the Figure 2c End seals,
[0018] Figure 3a The figure shows the adjustment system according to the present invention viewed from obliquely above,
[0019] Figure 3b A cross section of a detail of the adjustment system according to the invention is shown. DETAILED DESCRIPTION
[0020] exist Figure 1 An exemplary position of a fiber web machine is shown in FIG. 1 , in which a suction roll 10 is in nip contact with a pressure roll 11. Water is removed from the fiber web in the nip and flows into the holes of the shell of the suction roll, more generally onto the open surface of the suction roll. The transfer of water is enhanced by the negative pressure effect formed by a suction box 12 adapted into the suction roll 10. The negative pressure is generated in the suction box by suitable means, which are usually arranged outside the suction roll. At one or more axial seals 13, in the nip or before the nip, a suction zone 15 can be arranged, which has a negative pressure effect. The suction zone can have one or more suction sectors or suction chambers. In addition, the suction zone is defined by end seals 14, wherein at least one end seal is arranged on both ends of the suction roll. In practice, the end seals comprise a seal holder and a sealing strip. After the suction zone 15, the water on the open surface of the suction roll is usually removed by gravity. The suction roll may also be used for web control, for example to make the fiber web follow a desired fabric.
[0021] exist Figure 2a Another suction roll 10 of a fiber web machine is shown in FIG. In general, the suction roll 10 comprises a rotatably supported shell 16 and a suction box 12 adapted in the suction roll 10. A large shell may even have a million holes 17. Figure 2a The suction roll shown in FIG. 1 has two suction zones. The axial seals 13 are adapted on a holder 18 and usually have a loading hose 19 for pressing the axial seals against the inner surface of the shell. The end seals 14 are located between the axial seals 13 in such a way that the ends of the seal holders of the end seals are adapted to match the sides of the axial seals. In the direction of rotation of the suction roll there is usually a thick axial seal which acts as a muffler when the holes after the suction zone are refilled with air.
[0022] Figure 2a and Figure 2b The suction box 12 shown in FIG. 1 is a plate structure and has a cover 20. Here, the suction box is very light but very rigid. The cover has an opening, wherein the negative pressure introduced into the suction box extends to the suction zone defined by the seal and further through the perforated shell to the fiber web. The opening is shown in FIG. 2, Figure 2b and Figure 3a In practice, the negative pressure of the suction box draws water into the holes of the shell and causes the fiber web to follow the desired fabric. Figure 3aIn the embodiment, the axial seal 13 is supported on the cover 20 by the retaining member 18. Accordingly, a sliding surface 22 for the end seal 14 is machined at the end of the suction zone. The sliding surface is accurately machined on the base material of the cover, and the end seal slides along the sliding surface.
[0023] The utility model relates to an adjustment system for a suction roller of a fiber web machine. According to the above description, the suction roller 10 includes a movably adapted end seal 14. In practice, the end seal 14 includes a seal holder 23 bent corresponding to the cover 20 and a sealing strip 24 matched therewith. For example, the height of the seal holder can even be 80 mm, where the sealing strip further extends outward by 5 mm. The end seal here covers the distance between the sliding surface and the shell. The end seal 14 is connected to an actuator 25 assigned to the adjustment system, which is arranged in the suction roller. In Figure 2c , Figure 2d and Figure 3a 1 shows an end seal with an actuator. Each end seal has an independent adjustment system. In practice, the arrangement of the end seals can be adjusted independently relative to each other.
[0024] exist Figure 2b The perforated part of the shell 16 of the suction roll 10 is shown in dashed lines, wherein the outline of the suction box 12 installed in the shell 16 can be seen. The axial seal 13 is shown only in sections. A flange shaft 26 with a bearing structure 27 is fastened to the two ends of the shell 16 by means of bolts. The flange shaft has a central opening through which the negative pressure is guided into the suction box via a suction connection 28 present on the drive side. There is also a transmission 30 at the end on the drive side, to which the drive is connected via a drive pin 31. The lubricating spray (Schmierstrahlen) of the axial seal as well as the air loading and other guidance are carried out through the central opening. These connections are all collected on a guard plate 29 at the end on the leading side (Führerseite). The suction opening present in the cover of the suction box is defined by the axial seal 13 together with the end seal 14, whereby the suction width of the suction zone formed can be adjusted. For maintenance, the suction roll is removed from the fiber web machine. During maintenance, at least the flange shaft 26 is separated from the housing 16 and the suction box 12 is pulled out of the housing 16 while being supported by the rollers 32 .
[0025] Usually, attempts are made to optimize the width of the fiber web on a fiber web machine. When production conditions or product quality change, the width of the fiber web may change, which requires an adjustment system for the end seals. In practice, the end seals should be adjusted exactly to the edge of the fiber web. With the adjustment system according to the invention, the end seals can be in the desired position with millimeter accuracy.
[0026] In the present invention, the actuator 25 is a moving screw 33 equipped with a motor 34. The moving screw requires very little installation space and is very reliable. In addition, the use of a moving screw enables very precise adjustments and, on the other hand, fast adjustment movements. The moving screw with the motor can be an integrated unit, which is adapted into the suction roller and connected to the end seal. However, the proposed application is composed of standard parts. Here, each part can be selected according to the needs. At the same time, the transmission of harmful forces from one component to another is avoided. Therefore, the function of the adjustment system will remain sensitive without getting stuck. The motor can be pneumatic, hydraulic or electric.
[0027] Figure 2c The basic components of the adjustment system are shown in principle. Here, the nut 35 assigned to the movement screw 33 is connected to the end seal 14 via a slide bar 36, on which a slide guide 37 is adapted to achieve the fastening on the cover 20 of the suction roll 10. The slide bar is supported on the slide guide over a long distance, wherein the movement of the end seal is sensitive without getting stuck. In addition, the movement of the nut 35 is linear, without harmful bending forces or lateral forces, so that tilting of the end seal is avoided. The movement screw 33 is supported by its own bearing structure 38 and the movement screw is completely parallel to the slide bar 36. The motor 34 is supported by its own bracket 39 accordingly. If necessary, the motor can be supported at both ends. In principle, the motor can also be rigidly mounted as a continuation of the movement screw, but here a coupling 40 is inserted in the middle, which will allow an angular difference between the motor and the movement screw. Preferably, a trapezoidal thread is used, in which the movement screw is self-retaining. During adjustment, the motor can be uncontrolled or pressure-free or current-free. The coupling allows for angular errors in the bearing structure and the bracket, that is, small installation errors, as well as small bending and vibrations caused by operation. The multi-piece coupling shown (Doppellamellenkupplung) allows for a large degree of angular errors without affecting the function of the motion screw. Figure 2b-2d In the embodiment, the bearing structure 38 and the bracket 39 are fastened directly to the cover of the suction box 20. Figure 3aIn the present invention, the components of the adjustment system of the end seals fit into recesses machined in the cover 20, but if there are larger components requiring space, they can be mounted on a separate fastening plate 41 supported on the cover. The suction roll 10 generally comprises a suction box 12, on the cover of which a motor 34 and a movement screw 33 are supported.
[0028] The degree of the sector of the outer circumference of the shell covering the suction zone varies with the application object. The sector of the suction zone can range from a few degrees to tens of degrees. Figure 3a In the application shown, the number of degrees exceeds one hundred. For large numbers of degrees, i.e. large suction areas, two or more slide bars 36 are provided and connected to one another via a transfer arm 42, to which the nut 35 is adapted. In this case, the slide bars can even support and guide long end seals without any problems. At the same time, the force of the actuator can be uniformly transferred to the seal holder via the slide bars.
[0029] The cross section of the slide bar 36 according to the present invention is T-shaped, and the slide guide 37 ( Figure 3b ) is arranged with a corresponding T-slot 43. Preferably, a bronze-steel sliding pairing is used, wherein the sliding guide is preferably made of bronze. The sliding guide 37 is fixed to the cover 20 of the suction roller by bolts 44. The sliding guide 37 is fastened to the cover 20 of the suction roller by screws 44. The conveying arm 42 or the angle iron (Eckstück) 45 supporting the end seal 14 is fastened to the sliding bar 36 in a corresponding manner. As a result, the gap can be adjusted for the installation setting, so that possible angular errors can be avoided. In addition, the assembly can be disassembled without disassembling the entire adjustment system. In the utility model, grooves are machined on the sliding surface for sliding guides made of bronze, which are bolted instead of welded. In addition, the sliding bar moves in the sliding guide, wherein the end seal moves linearly with the sliding bar due to the long guide surface. Here, the sliding guide and the sliding bar of the seal holder of the end seal can be integrated in the same assembly unit.
[0030] Preferably, the actuator 25 comprises a sensor 46 for defining the axial position of the end seal 14. The sensor may be, for example, a linear encoder 47 or a pulse encoder adapted to the motor. Alternatively, the linear encoder 47 may be mounted, for example, between the nut 35 and the conveying arm 42.
[0031] The adjustment system according to the utility model achieves multiple advantages. The friction coefficient between the sliding bar and the corresponding sliding guide made of bronze is significantly lower than that of the known technology, in which the sliding of the assembly occurs between two surfaces made of stainless steel. In addition, the sliding surface of the sliding guide has a larger guiding area than before, which prevents the seal holder of the end seal from pivoting or tilting. With the sliding bar, sliding and pulling movements are uniformly generated at the height of the seal holder of the end seal without bending the seal holder. In addition, the rigidity and strength of the sliding rod are also greater than before over the entire movement route. This will prevent the bending of the sliding bar, which may cause uneven movement or bending on the seal holder. Since the size of the moving screw and the motor are very small, the entire adjustment system can be adapted between the cover and the shell of the suction box. This frees up space for other structures and components in the suction box. If the larger adjustment nut arranged in some places is removed, space is freed up for the guard plate, and only those freely arranged connectors for the motor and possible sensors are required. The connector of the guard plate can also be arranged more freely, so that the positioning of the guard plate connector and the lead wire and the assembly work of the suction box are easier. The adjustment system can be easily developed into a modular type, wherein the adjustment system is suitable for each suction roller and only the number and / or angle of the suction sector are changed. The adjustment system can be remotely controlled based on motor technology, especially sensor technology. In practice, a linear encoder can be used, for example, to accurately obtain the position indication of the end seal. Therefore, the complex process and auxiliary device previously used to define the position are no longer necessary. In practice, compared with the known adjustment system, the adjustment system according to the utility model realizes a significantly more accurate position of the end seal because the rise (Anstieg) of the thread is smaller. The adjustment system of the end seal is very fast, because it only takes less than one minute to adjust the entire moving distance of 150mm. Since the components are arranged on the cover of the suction box, it is easy to maintain the adjustment system. At the same time, space for inhaling air is freed up in the hollow shaft of the suction roller. Furthermore, electrical cables or pneumatic hoses can be easily routed in the hollow shaft in the most favorable way without creating any resistance to the intake air.
Claims
1. An adjustment device for a suction roll of a fiber web machine, the suction roll (10) comprising a movably adapted end seal (14), an actuator (25) assigned to the adjustment device being connected to the end seal, the actuator being arranged in the suction roll (10), characterized in that The actuator (25) is a moving screw (33) equipped with a motor (34).
2. The adjusting device according to claim 1, characterized in that: The nut (35) assigned to the movement screw (33) is connected to the end seal (14) via a slide bar (36) on which a slide guide (37) is adapted to be attached to the suction roller (10).
3. The adjusting device according to claim 2, characterized in that: There are two or more slide bars (36), and the slide bars (36) are connected to each other via a conveying arm (42), on which the nut (35) is adapted.
4. The adjusting device according to claim 2 or 3, characterized in that: The cross section of the sliding strip (36) is T-shaped, and a corresponding T-shaped groove (43) is arranged on the sliding guide (37), and the sliding guide is made of different materials.
5. The adjusting device according to any one of claims 1 to 3, characterized in that: The suction roller (10) comprises a suction box (12), and the movement screw (33) and the motor (34) are supported on a cover (20) assigned to the suction box.
6. The adjusting device according to claim 4, characterized in that: The suction roller (10) comprises a suction box (12), and the movement screw (33) and the motor (34) are supported on a cover (20) assigned to the suction box.
7. The adjusting device according to any one of claims 1 to 3, characterized in that: The actuator (25) comprises a sensor (46) for defining the position of the end seal (14) in the axial direction.
8. The adjusting device according to claim 4, characterized in that: The actuator (25) comprises a sensor (46) for defining the position of the end seal (14) in the axial direction.
9. The adjusting device according to claim 5, characterized in that: The actuator (25) comprises a sensor (46) for defining the position of the end seal (14) in the axial direction.