CN219010808U - Press device for treating paper web - Google Patents

Abstract

The utility model discloses a press device for treating a paper web, comprising: a first shoe press roll for applying a first pressure to the web; a carrier roller driven by a motor and abutting against the first shoe-type press roller; a first felt carrying the web at least during its passage through the first wide nip N1; a second shoe press roll abutting the backing roll on the other side of the backing roll, the second shoe press roll providing a second pressure that counteracts or partially counteracts the first pressure applied by the first shoe press roll to the web. The utility model can make the stress on the two sides of the supporting roller offset each other or offset mostly, and the supporting roller positioned in the middle position can avoid bearing the larger pressure deflection of a single side, thus the transverse uniform pressure area condition can be obtained without adopting a controllable middle-high roller, the squeezing effect is good, the supporting roller has light weight and simple structure, the roller shell and the bearing of the supporting roller do not bear larger alternating stress, the fault risk of bending and breaking is reduced, and the reliability is improved.

Description

Press device for treating paper web

Technical Field

The utility model relates to the technical field of papermaking, in particular to a squeezing device for treating a paper web, and belongs to the field of D21F 3/04 of IPC classification.

Background

In the press section of paper machines for producing fibrous webs, in particular paper webs, the highly efficient press technique currently used for improving the dryness of the paper web is the wide nip press, also known as shoe press, which is described in detail in the paper pulp and paper machine and equipment book of the 2003 edition of the light industry press in china. The shoe press has a shoe plate with a length of 250-300mm and an average pressing force equivalent toThe normal pressing method is adopted to press the bearing roller to 1050kN/m, which is 8 times of the pressing pressure of the traditional pressing roller, the bearing roller of the matched shoe pressing roller can flex and deform under the high pressure, so that on one hand, the pressure distribution of the whole transverse pressing contact surface is uneven, and more seriously, the bearing for supporting the rotation of the bearing roller is subjected to alternating stress, and the bearing is easy to fatigue damage. In order to solve the problem, the backup roll usually adopts a controllable middle-high roll so as to obtain uniform nip conditions under different pressing loads, and adopts a built-in hydraulic device to form a fluid sliding bearing layer between a rotating roll shell and a fixed cross beam, so that flexible sliding bearings can be formed to adapt to deflection deformation of the fixed cross beam, a mechanical bearing for supporting the rotation of the roll shell is not influenced by the deformation of the fixed cross beam, the roll shell and the bearing for supporting the rotation of the roll shell cannot bear alternating stress, and therefore, the roll shell and the bearing are not easy to fatigue and damage, but the hydraulic control system is complex, has higher cost and difficult maintenance, and the sliding friction force f between a boot sleeve and a boot plate needs to be overcome simultaneously due to a motor for driving the rotation of the controllable middle-high roll shell _{Boot pressure} Sliding friction force f of controllable middle-high roller shell and built-in hydraulic device _{Back pressure} Friction force f of bearing supporting roller shell _Bearing Etc., resulting in a large motor power, the total motor power of a system employing dual shoe presses is more multiplied.

The embodiment shown in figures 5 and 6 of GB2218122B discloses a symmetrically arranged twin nip arrangement having a central long nip pressure unit in which the two wide nips are symmetrically arranged about the axial plane of the central long nip pressure unit so that the reaction forces of the two backup rolls on either side of the central long nip pressure unit are symmetrically counteracted to reduce the deflection of the central long nip pressure unit bending beam. The patent does not consider the problem of fatigue failure caused by deflection deformation of the two side supporting rollers due to opposite pressing force applied to two sides by the central long-nip pressure unit, and the bearing supporting the two side supporting rollers to rotate is subjected to alternating load, in addition, the two side supporting rollers all need motor driving, and the bearing of the supporting roller is subjected to huge shoe pressure applied to one side to cause bearing friction force f _Bearing And thus the motor consumes much power. And is ofThe roll sleeve of the central long-nip pressure unit is required to be subjected to large deformation fit by the shoe-shaped plate jacking during working, and the roll sleeve is easy to age and affects the service life of the roll sleeve.

For terms and common knowledge, see "pulping and papermaking machinery and equipment lower" of the 2003 edition of the light industry Press of China, mechanical engineering Manual "of the 1983 or 1997 edition of the mechanical engineering handbook, motor engineering handbook" and industry Standard QB/T1693-1993 "pulping and papermaking machinery equipment terminology", and British published patent GB2218122B "A press section of a machine for the prodution of a fibrous web, particular a paper web".

Disclosure of Invention

In order to solve the above-mentioned problems of the background art, the present utility model provides a press apparatus for processing a paper web, comprising a motor, and:

the bearing roller comprises a cylindrical roller shell, a rotating shaft fixedly connected with the roller shell and a bearing for supporting the rotating shaft, and the motor is coupled with the rotating shaft to drive the roller shell to rotate;

a first shoe press roll which is abutted against one side of the backup roll and driven by the backup roll to rotate, wherein a first wide press area N1 for pressing a paper web is formed between the backup roll and the first shoe press roll by applying a first pressure to the backup roll;

a second shoe press roll which is abutted against the other side of the backup roll and is driven by the backup roll to rotate, wherein a second wide press area N2 for pressing the paper web is formed between the backup roll and the second shoe press roll by applying a second pressure for counteracting or partially counteracting the first pressure to the backup roll;

the carrier roll turns to guide the web from the first wide nip N1 through the second wide nip N2.

The utility model presses the paper web in two wide press areas with high pressing rate effect on the circumferential surface of the supporting roller by arranging a first shoe press roller on one side of the supporting roller and arranging a second shoe press roller on the other side of the supporting roller, and the two shoe press rollers apply pressure to the supporting rollerThe directions are different, and the pressure on two sides of the bearing roller can be offset or mostly offset by reasonable presetting, so that the bearing roller positioned in the middle position can avoid bearing deformation, and a complex hydraulic device is not required to be arranged to adjust deflection change of the bearing roller, namely, the bearing roller does not need to adopt a complex and expensive controllable middle-high roller; meanwhile, as the backup roller has no deflection deformation or only slight deflection deformation, the roller shell of the backup roller and the bearing for supporting the rotation of the backup roller are prevented from bearing alternating stress caused by larger deflection, the failure risk of cracking and breaking is reduced, and the reliability is improved. The boot-type compression roller sleeve matched with the roller shell in shape cannot generate great local repeated deformation, so that fatigue damage is avoided and frequent replacement is avoided. The squeezing device can realize twice wide-pressure-area squeezing by only driving the carrier roller to rotate by one motor, which is equivalent to an independent two-set shoe pressing system, and the motor only needs to overcome the sliding friction force f of the two-side shoe sleeves and the shoe plate _{Boot pressure} There is no sliding friction force f of the controllable middle-high roller _{Back pressure} The bearing stress of the carrier roller is counteracted, and the bearing friction force f _Bearing And the motor consumption power is small, and is generally equal to about 50 percent of the total power of the motor provided with the controllable middle-high roller, even less, and the energy-saving effect is obvious.

Preferably, the second shoe press roll is located on the other side of the plane P passing through the bearing roll axis and perpendicular to the connecting line of the first shoe press roll and the bearing roll axis, and the value of an included angle Q between the connecting line of the second shoe press roll and the bearing roll axis and the connecting line of the first shoe press roll and the bearing roll axis is not more than 30 degrees.

Preferably, the included angle Q between the connecting line of the second shoe type press roll and the bearing roll shaft center and the connecting line of the first shoe type press roll and the bearing roll shaft center is 0 degree.

Because the component force F2cosQ of the acting force F2 applied by the second shoe-type press roller to the supporting roller is opposite to the direction of the acting force F1 applied by the first shoe-type press roller to the supporting roller, when the value of F1 and F2 is close to the value of Q value and is not more than 30 DEG, the resultant force F in two directions _{He 1} F (F) _{He 2} The bearing roller bearing pressure is counteracted and reduced, thus the bearing roller bearing pressure can be reducedAnd the deflection deformation of the carrier roller is less supported. In particular, when F1 and F2 are close to each other and Q is close to 0 degree, F _{He 1} F (F) _{He 2} The values of the bearing rollers are close to zero, the bearing rollers bear opposite pressure directions and offset each other, the bearing rollers basically have no deflection deformation, the roller shell of the bearing roller and the bearing for supporting the bearing roller to rotate are prevented from bearing alternating stress caused by larger deflection, the fault risk of cracking and breaking is reduced, and the reliability is improved. Therefore, the carrier roller does not need to be internally provided with a complex hydraulic device, namely, a controllable middle-high roller is not needed to adjust deflection change of the carrier roller, a transverse wide pressing area opposite to the shoe-type pressing roller can obtain uniform pressing area conditions, the stress on two sides of a bearing of the carrier roller is mutually counteracted, and the friction force f of the bearing is _Bearing The motor consumption power is reduced.

Preferably, the bearing roller-shaped inner cavity is provided with a bearing member for supporting the inner wall of the roller shell, and the bearing member is used for avoiding the deflection deformation of the roller shell.

Preferably, the bearing member is a plurality of parallel support partition plates positioned in the inner cavity of the roller shell, and the periphery of the support partition plates is abutted with the wall of the inner cavity of the roller shell to fixedly support the roller shell. The inner cavity of the roller shell is supported by the parallel supporting partition plates, the bending strength is increased, acting forces received by two sides of the roller shell are offset or mostly offset, so that the roller shell cannot generate larger deflection deformation, meanwhile, the bearing for supporting the rotation of the rotating shafts at two ends is not large in bearing pressure and is prevented from bearing alternating stress caused by deflection of the roller shell, the bearing reduces the fault risk of bearing pressure cracking, and the reliability is improved.

Preferably, the press apparatus for treating a paper web according to the present utility model further comprises a press group formed of a vacuum press roll and a general press roll, and the paper web is pressed by a press nip between the vacuum press roll and the general press roll before passing through the first extended nip N1.

The arrangement is suitable for manufacturing a paper web with relatively high thickness and high water content, can improve the dryness after the paper web is pressed, and is beneficial to the subsequent double-wide-pressure-area pressing to meet the requirement of the paper web design dryness.

Further, the press group formed by the vacuum press roll and the ordinary press roll is located in a lower area of a first wide nip N1 formed between the first shoe press roll and the backup roll. The method comprises the following steps: the axle center connecting line L1 of the vacuum press roller and the common press roller extends upwards to be intersected with the axle center connecting line L2 of the first shoe press roller and the bearing roller at K1, and then the intersection point K1 is positioned between the axle center of the first shoe press roller and the axle center of the bearing roller. This design saves space in the whole press.

Further, the diameters of the peripheries of the shoe sleeves of the first shoe press roll and the second shoe press roll are D1, the diameter of the outer periphery of the roll shell of the backup roll is D2, and then: d2 = (1-1.3) D1. In this way, the space in the lower region between the first shoe press roll and the second shoe press roll is enlarged, facilitating the placement of numerous components including a water pan, guide roll, vacuum suction roll, doctor blade assembly, vacuum press roll, and the like.

Further, the included angle Q between the connecting line of the second boot-type compression roller and the axle center of the carrier roller and the connecting line of the first boot-type compression roller and the axle center of the carrier roller is 10-15 degrees. Thus, the bearing roller bearing pressure can be greatly reduced, and the space of the lower area between the first shoe-type compression roller and the second shoe-type compression roller can be increased.

Preferably, the surface of the backup roll is a smooth surface, which is suitable for directly contacting the suction web and guiding the web in a rotating progression.

The technical scheme and effect of the present utility model will be further described in the detailed description with reference to the accompanying drawings.

Drawings

FIG. 1 is a radial cross-sectional view of a prior art shoe press unit;

FIG. 2 is an axial cross-sectional view of a prior art shoe press unit;

FIG. 3 is a schematic diagram of a force deflection of a prior art shoe press unit;

FIG. 4 is a schematic diagram of a controllable mid-to-high roll and motor coupling of a prior art shoe press unit;

FIG. 5 is a radial cross-sectional view of an embodiment 1 of the shoe press unit of the present utility model;

FIG. 6 is a cross-sectional view A-A of FIG. 5;

FIG. 7 is a force diagram of example 1 of a shoe press unit of the present utility model;

FIG. 8 is a radial cross-sectional view of example 2 of a shoe press unit of the present utility model;

FIG. 9 is a force diagram of example 2 of a shoe press unit of the present utility model;

FIG. 10 is a schematic view showing the assembly of example 1 of the press apparatus of the present utility model;

FIG. 11 is a schematic view showing the assembly of example 2 of the press apparatus of the present utility model;

FIG. 12 is a preferred component layout of the press apparatus of the present utility model;

reference numerals

A controllable mid-high roll 10', a roll shell a101', a beam 102', a hydraulic support unit 103', a bearing a104', a bearing housing a105', a fluid sliding bearing layer 106', a shoe press roll 20', a roll mantle 201, a bracket 202, a hydraulic cylinder 203, a shoe plate 204; the doctor assembly 11, the roll shell 101, the rotating shaft 102, the supporting partition 103, the bearing 104, the bearing housing 105, the first shoe press roll 20, the second shoe press roll 30, the guide roll 32, the water pan 33, the forming wire 1, the web 2, the first felt 21, the first vacuum suction roll 22, the second felt 23, the first wide nip N1, the second wide nip N2, the third felt 31, the fourth felt 41, the second vacuum suction roll 42, the drying cylinder 43, the gear pair 53', the first coupling 52', the first motor 5 'of the speed reducer 51', the first coupling 52', the gear pair 53', the motor 5, the flange 51, and the second coupling 52.

Detailed Description

As shown in the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. In the embodiment of the utility model, the following steps are included: the advancing direction of the paper web is the front, and the reverse direction is the rear; the shoe press roll refers to a press roll provided with a rotatable roll sleeve, a fixed cross beam and a hydraulic control shoe plate in a shoe press unit; the carrier roller is used for bearing the load of a hydraulic control shoe plate of a shoe press roller and is arranged in a matched manner with the shoe press roller to form a press roller for pressing in a wide press area; the wide nip refers to a nip in which the wide nip presses; the part is near the pressure contact transfer area and is at the top end or the top side, and the part is far away from the pressure contact transfer area and is at the bottom end or the bottom side. The embodiments described below by referring to the drawings are illustrative for the purpose of explaining the present utility model and are not to be construed as limiting the utility model, and the detailed description is given below in connection with the specific embodiments.

The shoe press unit commonly used in the prior art is composed mainly of a shoe press roll 20 'and a controllable middle and high roll 10', as shown in fig. 1 and 2, and is generally arranged one above the other, the shoe press roll 20 'being above the controllable middle and high roll 10'. Bearing seats are arranged on the transmission side and the operation side of the two rollers, the bearing seats are respectively fixed by two locking arms (not shown), the locking arms are used for balancing the interaction pressure of the two rollers during normal operation so as to ensure the stability of the rollers during operation, and the hydraulic oil systems of the two rollers of the shoe press unit are generally identical.

The shoe press roll 20' mainly comprises a roll sleeve 201, a bracket 202, a hydraulic cylinder 203 and a shoe plate 204, wherein the roll sleeve 201 is made of flexible materials such as polyurethane, and is actually a synthetic adhesive tape. Shoe press roll 20' is a wide nip press roll and in operation, roll sleeve 201 is positioned about a generally circular path between support 202 and shoe 204 to overcome frictional force f with shoe 204 _{Boot pressure} The shoe 204, which rotates, has a sliding tip surface for sliding of the roll mantle 201, which also fits the shape of the controllable high roll 10', presses the roll mantle 201 against the controllable high roll 10' upon ejection of the hydraulic cylinder 203, presses the web or felt against the controllable high roll 10' and presses the web or felt out Zhou Shixian for dewatering. Wherein the hydraulic cylinder 203 is fixedly mounted on the non-rotatable bracket 202, and both ends of the bracket 202 are supported by fixed bearing blocks.

The main components of the controllable middle-high roller 10' are composed of a roller shell A101', a beam 102', a hydraulic support unit 103', a bearing A104', and a bearing seat A105', wherein the bearing seat A105' is fixedly arranged on the non-rotatable beam 102', the roller shell A101' is rotatably supported and arranged on the bearing seat A105' through the bearing A104', a fluid sliding bearing layer 106' formed by lubricating oil is arranged between the hydraulic support unit 103' and the roller shell A101', the connecting structure of the controllable middle-high roller 10' and a motor is as shown in fig. 4, a gear is fixedly connected at one end of the roller shell A101', and gear pairs 53' and first couplings are respectively arranged at two sides of the axis of the roller shell A101The shaft device 52', the speed reducer 51' are connected with a first motor 5', and the first motor drives the controllable middle-high roller 10' to overcome the sliding friction force f of the roller shell A101' and the hydraulic supporting unit 103 _{Back pressure} Friction force f of bearing a104' supporting the roll shell _Bearing The roller sleeve 201 driving the shoe press roller 20' overcomes the friction force f with the shoe plate 204 _{Boot pressure} The web is smoothly brought into a nip for extended nip pressing by rotating together. In other applications it is also possible that only one side of the axis of the roll shell a101' is coupled with the first motor 5' using the gear pair 53', the first coupling 52', the reduction 51 '.

Since the shoe 204 applies a great working pressure to the web or felt, the average pressing force F1' on a shoe of 250mm width can reach a pressure equivalent to 1050KN/m by the line pressure of the normal pressing method, which is 8 times the pressing force of the conventional press roll, the fixed beam of the roll is deformed by deflection of the pressure, which can be as great as tens of millimeters, as shown in fig. 3. In order to solve the problem caused by the deformation, the carrier roller can adopt a controllable middle-high roller, a hydraulic supporting unit 103 'is arranged on a beam 102' which is fixed at the center of the controllable middle-high roller and does not rotate, the hydraulic supporting unit 103 'and a hydraulic cylinder 203 of the shoe-type compression roller use the same hydraulic oil system, so that an adaptive liquid balance pressure F2' is conveniently provided to act on a roller shell A101 'to balance with the pressure F1' of the shoe-type compression roller, the roller shell A101 'does not have deflection deformation, the rotating roller shell A101' and a bearing A104 'for supporting the rotating roller shell A101' bear little pressure, bear no alternating stress, are not easy to fatigue damage, and have high reliability. Moreover, the follower roller housing 201 of the shoe-type press roller is made of flexible materials, and the bearing pressure is transmitted to the fixed bracket 202 by the shoe-type plate 204 propped against the follower roller housing, so that the bearing (not shown) supporting the roller housing 201 is not stressed and the risk of failure of the bearing is not great. The flexural deformation of the frame 202 and the beam 102 'can achieve a laterally uniform nip condition by adjusting the load pressures of the hydraulic cylinders 203 and the opposing hydraulic support units 103', achieving good press efficiency. However, the backup roll of the shoe press unit is complicated in system, difficult to maintain and high in cost due to the need of adopting the controllable middle and high roll, and the first motor 5' for driving the roll shell of the controllable middle and high roll to rotate is overcome simultaneously due to the need ofSliding friction force f between sleeve 201 and shoe 204 _{Boot pressure} Sliding friction force f of roller shell and hydraulic support unit _{Back pressure} And the friction force f of the bearing A104' supporting the roll shell _{The bearing is provided with a plurality of grooves,} and the consumed power is high. In particular, for a two-shoe press system, the power consumption is multiplied. For example, for a double shoe press system with a width of 4800mm and a vehicle speed of 1000m/min and provided with controllable middle and high rolls, the total power of the motor reaches 2500kW.

The present utility model will be described in detail with reference to the following examples.

Shoe press unit example 1 of the utility model:

as shown in fig. 5 and 6, a shoe press unit according to an embodiment 1 of the present utility model is composed of a backup roll 10 located at an intermediate position, a first shoe press roll 20 located on one side of the backup roll 10 and arranged in parallel therewith, and a second shoe press roll 30 located on the other side of the backup roll 10.

Specifically, in the radial projection direction, the second shoe press roller 30 and the first shoe press roller 20 are respectively located at two sides of a plane P passing through the axis of the backup roller 10 and perpendicular to the axis line of the first shoe press roller 20 and the backup roller 10, the axis line of the second shoe press roller 30 and the backup roller 10 and the axis line of the first shoe press roller 20 and the axis line of the backup roller 10 form an included angle Q, and the value of Q is not greater than 30 degrees. Preferably 0 degrees, 10 degrees, 15 degrees, 30 degrees.

The first shoe press roll 20 and the second shoe press roll 30 have the same structure as the shoe press roll 20' of the prior art described above, and the structure of the first shoe press roll 20 and the second shoe press roll 30 is not repeated herein, and the first wide nip N1 of the press unit is formed in the nip between the first shoe press roll 20 and the backup roll 10, and the second wide nip N2 is formed in the nip between the second shoe press roll 30 and the backup roll 10.

As shown in fig. 6, the main components of the carrier roller 10 are composed of a roller shell 101, a rotating shaft 102, a supporting partition 103, a bearing 104 and a bearing seat 105, wherein the roller shell 101 is a hollow cylindrical body, two ends of the roller shell are fixed with the rotating shaft 102, the rotating shaft 102 is supported and arranged on the bearing seat 105 through the bearing 104, the motor 5 of the embodiment is connected with the rotating shaft 102 of the carrier roller 10 through a flange 51, and the rotating shaft 102 is driven by the motor 5 to rotate together with the roller shell 101 and drive the roller sleeve to rotate together, so that a paper web or a blanket can be smoothly brought into a overpressure zone. The inner cavity of the roller shell 101 is provided with a bearing member for supporting the inner wall of the roller shell, as shown in fig. 6, the bearing member is a plurality of support partition plates 103 which are axially arranged in parallel at a certain distance in the inner cavity of the roller shell 101, the periphery of each support partition plate 103 is abutted against the inner cavity wall of the roller shell 101 to fix the bearing roller shell 101, and the support partition plates 103 are mutually and fixedly connected into an integrated structure. In other embodiments, the bearing member may be an i-beam disposed in the inner cavity of the roller shell 101, and the outer periphery of the i-beam is adapted to abut against the inner wall of the roller shell 101; the bearing member may also be a cylindrical column coaxially arranged with the roller shell 101, and the periphery of the column is adapted to abut against the inner wall of the roller shell 101. The bearing members have various structural forms, and can be fixedly adapted to abut against the inner wall of the roller shell 101 to improve the bending strength of the roller shell 101.

In the present embodiment, as shown in fig. 5 and 7, F1 is the acting force of the first shoe press roll 20 on the support roll 10, and F2 is the acting force of the second shoe press roll 30 on the support roll 10, and in general, in order to improve the dryness of the paper web passing through the shoe press unit, the value of the first pressure F1 is not less than 500kN/m, and the value of the second pressure F2 should not be less than F1, preferably f2= (1.0-1.5) F1. Under the condition of not considering the dead weight of the back-up roll, the directions of F1 and F2 are different, and the resultant force F in one direction _{He 1} =f1-f2×cosq, resultant force F in the other direction _{He 2} When the value of F2 is not more than 1.5 times the value of F1 and the value of Q is not more than 30 degrees, F _{He 1} F (F) _{He 2} The values of (2) can be offset to a greater extent and reduced, and the bearing roller 10 is subjected to reduced pressure, so that deflection can be reduced, the bearing roller 10 does not need to be internally provided with a complex hydraulic device, namely, a controllable middle-high roller is not needed to adjust deflection change of the bearing roller 10, and a uniform nip condition can be obtained in a transverse wide nip opposite to a shoe-type compression roller. In addition, the carrier roller 10 has simple structure, the bearing member fixedly connected with the roller shell 101 can improve the bending strength of the roller shell, and the pressure born by the roller shell 101 and the bearing 104 for supporting the roller shell to rotate is reduced due to the mutual offset of the stress on the two sides, thus reducing the friction force f of the bearing 104 _Bearing The motor power consumption is reduced. Particularly, the alternating stress caused by the deflection of the roller shell is greatly reduced, becauseThe risk of failure of cracking or breaking of the roller shell and the bearing is reduced, and the reliability is improved.

As shown in fig. 8 and 9, a shoe press unit embodiment 2 of the present utility model is a modified design of the shoe press unit embodiment 1, in which the angle Q between the line connecting the axis of the second shoe press roll 30 and the axis of the backup roll 10 and the line connecting the axis of the first shoe press roll 20 and the axis of the backup roll 10 is 0 degrees, that is, the two shoe press rolls are symmetrically arranged on two sides of the plane P, and the shoe plates of the two shoe press rolls and the backup roll 10 form two wide press areas which are symmetrically arranged, namely, a first wide press area N1 and a second wide press area N2. The motor 5 of this embodiment is coupled to the shaft 102 of the backup roll 10 via the second coupling 52, preferably by a flexible connection, to compensate for the relative misalignment of the axes of the two shafts and to reduce vibration. The roll shell 101 is driven by the motor 5 against the friction force f of the bearing 104 supporting the roll shell _Bearing The roller sleeve 201 of the shoe-type press roller which drives the two shoe-type press rollers which are symmetrically arranged with the carrier roller 10 overcomes the friction force f between the shoe-type press roller and the shoe-type plate 204 _{Boot pressure} Rotates together. Thus, the web 2 is guided through the first and second extended nip N1 and N2 continuously for each rotation of the roll shell 101, and two extended nip presses are completed, with high press efficiency.

In the present embodiment, as shown in fig. 8 and 9, the bearing roller 10 is capable of reducing bearing deformation greatly due to the symmetrical and mutually offset pressures at both sides, and there is no need to install a complex hydraulic device to adjust the deflection change of the adaptive bearing roller 10, and uniform nip conditions can be obtained in the lateral direction of the wide nip N1 and N2 at both sides, so as to obtain good squeezing effect. The back-up roll has a simple structure, the bending strength of the roll shell can be improved by the bearing member fixedly connected with the roll shell, and the opposite directions of the pressure born by the roll shell at two sides are counteracted, so that the roll shell and the bearing 104 supporting the roll shell to rotate bear little pressure and cannot bear alternating stress generated by the deflection of the roll shell, the fault risk of cracking or breaking is reduced, and the reliability is improved.

In particular, the shoe press unit of the present utility model requires only one motor to drive the backup roll to rotate, and the motor only needs to overcome the sliding friction force between the shoe sleeve and the shoe plate of the shoe press rolls on both sides symmetrically arranged with the backup rollf _{Boot pressure} There is no sliding friction force f of the controllable middle-high roller _{The back pressure of the liquid is controlled,} and the bearing stress of the carrier roller is balanced, and the bearing friction force f _Bearing The power consumption of the driving motor of the shoe press unit is generally equal to about 50 percent of the power consumption of the driving motor of a double shoe press system with controllable middle and high rollers, even lower, and the energy consumption performance is greatly improved. For example, the shoe press unit of the embodiment, which is also of a width of 4800mm and a vehicle speed of 1000m/min, only needs one motor to drive the supporting roller positioned at the center of the two shoe press rollers, and experiments prove that the motor power is 1000kW, so that the roller shell of the supporting roller and the shoe sleeves of the two shoe press rollers can be driven, the paper web 2 is guided to continuously pass through the first wide press area N1 and the second wide press area N2, the two wide press areas are completed, and the power consumption of the motor can be saved by 60%.

Press apparatus example 1:

the press apparatus of this embodiment is mainly constructed using the shoe press unit embodiment of the present utility model, and specifically as shown in fig. 10, a first felt 21 is fed from below and picks up a paper web 2 from a forming wire 1 by a first vacuum suction roll 22, and then the first felt 21, the paper web 2 are fed together in the web traveling direction to a first wide nip N1 formed by a first shoe press roll 20 and a backing roll 10, and the paper web 2 is guided to be press-dewatered by a nip between the first felt 21 and the backing roll 10. The still moist web 2, after leaving the first felt 21, can then adhere to the surface of the backing roll 10 and continue to travel, being guided together with the third felt 31 through the second wide nip N2, where the web is guided to be pressed through the nip between the backing roll 10 and the third felt 31.

Wherein the roll shell 101 of the carrier roll 10 has a smooth surface adapted to be in direct contact with the web 2, for example, with stone rolls or rolls with a defined plasticity.

After the web 2 has passed the second wide nip N2, the second vacuum suction roll 42 transfers the web 2 from the third felt 31 or from the roll shell 101 directly to the fourth felt 41 and into the drying cylinder 43 for drying.

The two wide nips N1 and N2 of the present embodiment form a symmetry in the same backup roll 10 in the centerThe bearing rollers at the two sides are not or less in deflection deformation due to pressure offset, the roller shells and bearings of the bearing rollers are prevented from bearing alternating stress caused by deflection of the roller shells, the fault risk of cracking and breaking is reduced, the reliability is improved, in addition, a controllable middle-high roller is not needed, the wide pressure areas at the two sides of the bearing rollers can obtain the transversely uniform pressure area condition, the squeezing effect is good, the whole structure is simple and compact, the cost is low, and the reliability is high. In particular, the pressing device of the embodiment adopts only one motor to drive the supporting roller to rotate, and the motor only needs to overcome the sliding friction force f between the shoe sleeve and the shoe plate of the shoe press rollers on two sides symmetrically arranged with the supporting roller _{Boot pressure} There is no sliding friction force f of the controllable middle-high roller _{The back pressure of the liquid is controlled,} and the bearing stress of the carrier roller is balanced, and the bearing friction force f _Bearing The power consumption of the motor is small, the power consumption of the driving motor of the squeezing device is generally equal to about 50 percent of the power consumption of the driving motor of a double-shoe pressure system with controllable middle and high rollers, even less, and the energy consumption performance is greatly improved. For example, the pressing device of the embodiment, which is also of a width of 4800mm and a vehicle speed of 1000m/min, only needs one motor to drive the supporting roller positioned at the center of the two shoe press rollers, and experiments prove that the motor power is 1000kW, so that the roller shell of the supporting roller and the shoe sleeves of the two shoe press rollers can be driven, the paper web 2 is guided to continuously pass through the first wide press area N1 and the second wide press area N2, the two wide press areas are completed, and the motor power is saved by 60%.

Press apparatus example 2:

embodiment 2 is a modified design of embodiment 1, as shown in fig. 11, with the main difference that in the upstream area of the web 2 and the first felt 21 before passing through the first extended nip N1, there is further provided a press structure comprising a second felt 23, a vacuum press roll 24 and a general press roll 25, and the web 2 is guided together with the first felt 21 and the second felt 23 through the nip between the vacuum press roll 24 and the general press roll 25 for pressing. Other structures are substantially the same as those of embodiment 1, and will not be described here again.

This embodiment has the advantages of embodiment 1 and adds a press set of vacuum press rolls 24 and conventional press rolls 25 to press the web 2 before it passes through the first extended nip N1, which arrangement is suitable for making relatively thick and high moisture content webs, which can improve the dryness after pressing of high moisture content webs, which is advantageous for better web design dryness requirements for subsequent twin extended nip presses, and which can significantly improve the surface quality of both sides of the web. The energy saving effect of the embodiment of the pressing device is identical to that of the embodiment 1 of the pressing device, and will not be described here again.

The preferred layout of the components of the press apparatus of the present utility model is shown in fig. 12, and in order to save space in the entire press apparatus, it is preferable that the press group formed by the vacuum press roll 24 and the general press roll 25 is placed in the lower region of the first wide nip N1 formed between the first shoe press roll 20 and the backup roll 10, specifically: the arrangement is such that the axial line L1 of the vacuum press roll 24 and the ordinary press roll 25 extends upward to intersect with the axial line L2 of the first shoe press roll 20 and the carrier roll 10 at K1, and the intersection point K1 is located between the axial center of the first shoe press roll 20 and the axial center of the carrier roll 10. In addition, if the shoe outer diameters of the first shoe press roll 20 and the second shoe press roll 30 are D1, and the outer diameter of the roll shell 101 of the backup roll 10 is D2, d2= (1-1.3) D1 is set, so that the space for arranging components including the water pan 33, the guide roll 32, the vacuum suction roll 42, the doctor blade assembly 11, the vacuum press roll 24, and the like can be enlarged in the lower region between the first shoe press roll 20 and the second shoe press roll 30. Preferably, the angle Q between the line connecting the axis of the second shoe press roll 30 and the axis of the backup roll 10 and the line connecting the axis of the first shoe press roll 20 and the axis of the backup roll 10 is (10-15), which can not only greatly offset and reduce the bearing pressure of the backup roll 10, but also increase the space for arranging components in the lower area between the first shoe press roll 20 and the second shoe press roll 30.

The above embodiments are only for illustrating the technical aspects of the present utility model, not for limiting the same, and although the present utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with other technical solutions, where the modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims (11)

1. A press device for processing a paper web, comprising a motor and a carrier roller (10), wherein the carrier roller (10) comprises a cylindrical roller shell (101), a rotating shaft (102) fixedly connected with the roller shell and a bearing (104) for supporting the rotating shaft (102), and the motor is coupled with the rotating shaft (102) to drive the roller shell (101) to rotate, and the press device is characterized by a first shoe press roller (20) which is abutted against one side of the carrier roller (10) and is driven by the carrier roller (10) to rotate, and the first shoe press roller (20) forms a first wide press area N1 for pressing the paper web (2) between the carrier roller (10) and the first shoe press roller (20) by applying a first pressure to the carrier roller (10); a second shoe press roll (30) which is abutted against the other side of the carrier roll (10) and is driven by the carrier roll (10), wherein the second shoe press roll (30) forms a second wide press zone N2 for pressing the paper web (2) between the carrier roll (10) and the second shoe press roll (30) by applying a second pressure for counteracting or partially counteracting the first pressure to the carrier roll (10); the paper web (2) is attached to the outer surface of the carrier roller (10) and rotates from the first wide nip N1 through the second wide nip N2.

2. The press device for treating a paper web according to claim 1, wherein the second shoe press roll (30) is located at the other side of a plane P passing through the axis of the support roll (10) and perpendicular to the line connecting the first shoe press roll (20) and the axis of the support roll (10), and the value of the included angle Q between the line connecting the second shoe press roll (30) and the axis of the support roll (10) and the line connecting the first shoe press roll (20) and the axis of the support roll (10) is not more than 30 degrees.

3. A press arrangement for treating a paper web according to claim 2, characterized in that the angle Q between the line connecting the second shoe press roll (30) and the centre of the support roll (10) and the line connecting the first shoe press roll (20) and the centre of the support roll (10) is 0 degrees.

4. Press device for the treatment of paper webs according to claim 1, characterized in that the inner cavity of the roll shell (101) of the carrying roll is provided with a bearing member supporting the inner wall of the roll shell (101) for avoiding deflection of the roll shell (101).

5. The press device for processing a paper web according to claim 4, characterized in that the bearing members are a plurality of parallel support partitions (103) located in the inner cavity of the roll shell (101), and the outer periphery of the support partitions (103) is abutted against the inner cavity wall of the roll shell to fixedly support the roll shell (101).

6. A press arrangement for treating a paper web according to claim 1, characterized in that it further comprises a press group formed by a vacuum press roll (24) and a conventional press roll (25), the paper web (2) being pressed through the nip between the vacuum press roll (24) and the conventional press roll (25) before passing through the first extended nip N1.

7. Press arrangement for the treatment of a paper web according to claim 6, characterized in that the press group formed by the vacuum press roll (24) and the ordinary press roll (25) is located in the lower area of the first wide nip N1 formed between the first shoe press roll (20) and the carrier roll (10).

8. A press arrangement for treating a paper web according to claim 7, characterized in that the line L1 of the axes of the vacuum press roll (24) and the ordinary press roll (25) extends upwards to intersect the line L2 of the axes of the first shoe press roll (20) and the backing roll (10) at K1, whereby the intersection point K1 is located between the axes of the first shoe press roll (20) and the backing roll (10).

9. The press apparatus for treating a paper web according to claim 6, wherein the shoe outer diameters of the first shoe press roll (20) and the second shoe press roll (30) are D1, and the outer diameter of the roll shell (101) of the carrier roll (10) is D2, and there are: d2 = (1-1.3) D1.

10. The press device for treating a paper web according to claim 9, characterized in that the angle Q between the line connecting the second shoe press roll (30) and the shaft center of the support roll (10) and the line connecting the first shoe press roll (20) and the shaft center of the support roll (10) is 10-15 degrees.

11. Press device for treating a paper web according to any of claims 1-10, characterized in that the surface of the roll shell (101) is a smooth surface.

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