CN101883894A - Fiber web machine roll - Google Patents

Abstract

A fiber web machine roll (1 ) for processing a fiber web comprises a body (2) having a first end (2a) and a second end (2b); at least one shaft end (3a, 3b), fastened to an end of the body and comprising at least one first flow channel (4a, 4b) for conducting a heat-transfer agent in and/or out; and a shell layer around the body (2) for transferring heat from the heat- transfer agent to the fiber web or from the fiber web to the heat-transfer agent during operation. A tube-like metal shell (5) having a wall thickness of about 1 to 20 mm is arranged as a shell layer around the body (2) of the roll (1 ) so that a peripheral flow chamber (6) for the heat-transfer agent, having a height of about 1 to 2 mm in the radial direction of the roll (1 ), is formed between the body (2) and the metal shell (5), the flow chamber (6) having a flow connection to said at least one first flow channel (4a, 4b). For the roll maintenance of the fiber web machine roll (1 ), a metal shell (5) forming the shell layer can be replaced by another metal shell (5) having the same characteristics or having different characteristics. The fiber web machine roll can be implemented by modernizing old rolls to become in accordance with the invention.

Description

Fiber web machine roll

Technical field

The present invention relates to a kind of roller that in fiber web machine (being preferably paper, cardboard and chemical pulp grinder), uses, in order to handle (for example heat and/or cool off) width of cloth material class material.

The present invention relates to a kind of fiber web machine roll that is used to handle fiber web, comprising: body, it has first end and the second end; At least one axle head, it is fixed to body and comprises that at least one is used to import and/or derive the first flow of heat transfer agent; And shell layer, it is around body, is used between on-stream period heat is delivered to fiber web/be delivered to heat transfer agent from fiber web from heat transfer agent.

In addition, the present invention relates to a kind of method according to claim 18 that is used to safeguard fiber web machine roll according to claim 1.

In addition, the present invention relates to a kind of method according to claim 20 that is used to make fiber web machine roll.

Background technology

At present, the required heat energy of press polish paper and cardboard is produced by heated roller (being hot-rolling).The calender speed of service promotes significantly between the several years in the past.In order to obtain required press polish effect, the surface temperature of hot-rolling must be elevated to 200 ℃-250 ℃.The high speed of service that combines with the high surface temperature of hot-rolling means that the thermal energy exchange from hot-rolling must be very high, in new technology, is generally 200kW/m and even higher.

As everyone knows, the heat of hot-rolling is to produce by being directed to as the fluid of heat transfer agent in the hole in the hot-rolling housing, and in the hole, heat is delivered to housing and further is directed to the surface of roller.In open source literature, disclosed the example that the heat transfer hole is set in all marginal pores in housing such as DE 44 04 922 C1 and DE 40 36 121 A1.

Because of based on the restriction of process technology, the heat transfer agent hole must be set to from the surface of hot-rolling quite dark, remains on material between heat transfer agent hole and the hot-rolling surface thus and plays the effect of thermal barrier and limit thermal energy exchange from hot-rolling.And, consider that the actual maximum temperature of employed heat transfer agent in the hot-rolling (i.e. oil) is about 300 ℃, be limited in being about 200kW/min from the thermal energy exchange of hot-rolling, and the surface temperature of hot-rolling is limited to 200 ℃.

When the press polish of fiber web and drying process development and production line upgrade, must be with the new low excessively old hot-rolling of hot-rolling replacement heat exchange.The further use of this hot-rolling effectively is provided with as yet.Must retrofit for reusing to the hot-rolling that unloads from production line.

Overall purpose of the present invention is elimination or alleviates above-mentioned shortcoming and defect at least basically.Further purpose provides a kind of fiber web machine roll that can conduct heat in a large number, the flow passage system manufacturing of this fiber web machine is simple, have low manufacturing cost, and the housing that can guarantee fiber web machine roll thus has required characteristic, for example image surface characteristic and strength characteristics etc., and guarantee that the body of roller has required characteristic (being preferably bearer properties).Further purpose of the present invention is to simplify the maintenance of fiber web machine roll.Further purpose of the present invention is old roll body can be made fiber web machine roll as matrix.

Realized these purposes by the present invention, characteristic feature of the present invention is defined by the following claims.

Summary of the invention

Disclosed main characteristic feature at the characteristic of claim 1 according to fiber web machine roll of the present invention.

Tubular metal shell with about 1 to 20mm (being preferably 1 to 5mm) wall thickness is set to center on the shell layer according to the body of fiber web machine roll of the present invention, make between body and metal-back the periphery flow chamber that forms heat transfer agent, this periphery flow chamber has about 1 to 2mm height along the radial direction of fiber web machine roll.This flow chamber is to flow with the first flow that at least one is used to import and/or derive heat transfer agent and is communicated with, and flow chamber is positioned at the roll shaft end of fiber web machine.

First method according to the present invention comprises: replace the metal-back of the shell layer that constitutes fiber web machine roll with another metal-back with identical characteristics or different qualities, above-mentioned another metal-back can comprise that preferably following characteristic one of at least: surface quality, hardness, thickness, the strength of materials, welding applicability (suitability), thermal conductivity, hardening capacity.

Second method according to the present invention comprises: the body of roller that will be to be regulated or the body of roller with all marginal pores are provided for heat transfer agent is directed to from body interior second runner of body outer peripheral edges as the matrix of the body of fiber web machine roll in body.Tubular metal shell with about 1 to 20mm wall thickness is set to the shell layer around body, makes the periphery flow chamber that forms heat transfer agent between body and metal-back, and this periphery flow chamber has about 1 to 2mm height along the radial direction of fiber web machine roll.

In certain embodiments, roller comprises at least one flange that is fixed between body and at least one axle head, and metal-back is fixed to flange at least one borderline region by welding.

In certain embodiments, form groove on the surface of the body of roller, hoop is fixed to groove with closing form (form closure), and metal-back is fixed to hoop by welding.

In certain embodiments, on the surface of the body of roller, form shoulder, comprise that the hoop of groove is fixed to shoulder with closing form, and metal-back is fixed to hoop by welding.

Fiber web machine roll purpose according to the present invention is in order to extruding and/or press polish and/or heating and/or the cooling fiber web in the contact zone (being nip) between fiber web machine roll and the coupling member that contact fiber web machine roll, or in order to oven dry or heat or cool off fiber web on the surface of shell of fiber web machine roll.

Roller according to fiber web machine of the present invention is suitable in the application of following one or more fiber web machines: the hot-rolling of the hot-rolling of the squeeze unit of the hot-rolling of the hot-rolling of the hot-rolling of the hot-rolling of glazing calender, the hot-rolling of soft press-polishing machine, long-nip calenders, boots formula calender, the hot-rolling of belt calender, metal-belt calender, drying cylinder, fiber web machine and/or the coating section of fiber web machine.

According to the body of fiber web machine roll of the present invention can be by carrying, processing and cheap metal material such as cast iron are made easily, it does not need to possess good especially heat-transfer character, and shell layer can be optimized according to the required characteristic of superficial layer (as good ABRASION RESISTANCE and hardness).Shell layer can be formed relative thin or extremely thin, reduce the material consumption of shell layer thus.Shell layer also can be subjected to heat treatment in addition, as eliminating residual stress annealing and/or sclerosis and/or surface treatment and/or coating, to obtain desired characteristics.

Below, describe the present invention with reference to the accompanying drawings, yet the invention is not restricted to the content shown in the figure.

Description of drawings

Fig. 1 shows the cross section according to a kind of preferred hot-rolling of the present invention, and this hot-rolling is equipped with thin metal-back and is positioned at the periphery flow chamber that is used for heat transfer agent of shell.

Fig. 2 shows the partial enlarged drawing of the part A among Fig. 1, and Fig. 2 shows body fixing of metal-back and hot-rolling.

Fig. 3 shows the decision design of the material in the borderline region of metal-back.

Fig. 4 show no shell layer according to the hot-rolling of Fig. 1 and the example of the mobile F of heat transfer agent in the periphery flow chamber.

Fig. 5 to Fig. 8 shows several modes such as the metal-back of fixing hot-rolling shown in Figure 1 on the axial direction of body.

The specific embodiment

Fig. 1 shows and is used to handle being heated and/or cooled fibers width of cloth material machine roller of fiber web, and promptly hot-rolling 1.Hot-rolling 1 comprises: the body with general cylindrical shape outer surface 2 that is used to carry; And the axle head 3a, the 3b that are fixed to end 2a, the 2b of body.In Fig. 1, the first axle head 3a that is fixed to the first end 2a of body 2 comprises that at least one is used to import and/or derive the first flow 4a of heat transfer agent, and the second axle head 3b that is fixed to the second end 2b of body 2 comprises that at least one is used to import and/or derive the first flow 4b of heat transfer agent.Hot-rolling 1 comprises the shell layer 5 around body 2, and shell layer 5 is used between on-stream period heat being delivered to fiber web or being delivered to heat transfer agent from fiber web from heat transfer agent.Heat transfer agent is preferably the oil that at high temperature uses.Having about 1 to 20mm, as to be preferably 1 to 5mm wall thickness tubular metal shell 5 is configured to around the shell layer of the body 2 of hot-rolling 1, forming the periphery flow chamber 6 of heat transfer agent between body 2 and metal-back 5, this flow chamber radially has a height of about 1 to 2mm along preferred rotational symmetric hot-rolling 1.

In Fig. 2 and relevant description and in Fig. 5 to Fig. 8 and the relevant description, illustrate in greater detail body 2 fixing of metal-back 5 and hot-rolling 1 in the part A of Fig. 1.As shown in Figure 7, metal-back 5 also can be fixed to axle head 3a, the 3b of hot-rolling 1.

The body 2 of the hot-rolling 1 shown in Fig. 1 is preferably cylindrical shape and tubulose, and be included in the second runner 8a of its first end 2a, the second runner 8a forms to flow between the periphery flow chamber 6 of the volume 7a of inside first at the first end 2a place of body 2 and body 2 outsides and is communicated with.In addition, body 2 also is included in the second runner 8b of its second end 2b, the mobile circulation between the inside second portion volume 7b at the second end 2b place of second runner 8b formation body 2 and the periphery flow chamber 6 of body exterior.

By each end regions at body partition wall 9a, 9b are installed, form partial volume 7a, 7b in body 2, the basic configuration of body 2 is preferably cylindrical shape and tubulose, and the position of partition wall can be along the axial variation of body 2. Partition wall 9a, 9b can make the internal capacity of body separate with partial volume 7a, 7b, and internal capacity is limited by preferred wall 3a ', the 3b ' towards body 2 for columnar inwall 2d and axle head 3a, 3b of body 2. Partition wall 9a, 9b preferably are positioned to such an extent that to make a large amount of heat transfer agent be not to be stored in the hot-rolling 1.Partial volume 7a, the 7b that is positioned at different end 2a, the 2b of body 2 need not aspect volume and size similar, and can be because of differing from one another such as the different numbers of the difference configuration of the second runner 8a, 8b, the second runner 8a, 8b or the different types of axle head 3a, the 3b that are fixed to end 2a, the 2b of body 2.

The second runner 8a, 8b preferably form radial hole in body 2.Limit position or the number of the second runner 8a, 8b unintentionally in any form at this.The setting at the first end 2a place of body can be different from the setting that other end 2b place uses.The second runner 8a, the 8b of different numbers can be set at different end 2a, the 2b of body 2, and/or the diameter of the second runner 8a, 8b can be different with near the diameter the second runner 8a, the 8b or different with the diameter of the second runner 8a, the 8b that are positioned at the other end 2a, 2b.The second runner 8a, 8b can be positioned at a distance that end 2a, 2b are identical or different apart from body, and/or compare with equidistant mutually a plurality of other the second runner 8a, the 8b of end 2a, a 2b of distance body, at least one among the second runner 8a, the 8b can be positioned at this end 2a apart from body, the position of 2b different distance.The mutual distance of the second runner 8a, 8b preferably is set to along the direction of rotation of the periphery of hot-rolling 1 unequal in the body 2.When the second runner 8a, 8b when uniformly-spaced being provided with, the preferred number of second runner is prime number 11 and 13.

According to correlation technique of the present invention, the preferred body for cylindrical shape and tubulose of hot-rolling roller or that have all marginal pores by will be to be regulated is as the matrix of body 2, also the second runner 8a, 8b be can in hot-rolling 1, process, the second runner 8a, the 8b that are used for preferably heat transfer agent being directed to from the inside of body 2 its outer peripheral edges in body 2, are provided with.In the case, the tubular metal shell 5 that will have about 1 to 20mm wall thickness is set to center on the shell layer of body 2, thereby form the periphery flow chamber 6 of heat transfer agent between body 2 and metal-back 5, this flow chamber has about 1 to 2mm height along the radial direction of hot-rolling 1.

The flow passage system of hot-rolling 1 comprises the following each several part that is the connection of flowing in mode shown in Figure 1: the first flow 4a that is positioned at the first axle head 3a; Be positioned at the volume 7a of first of the first end 2a of body 2; The second runner 8a that connects volume 7a of first and periphery flow chamber 6; Periphery flow chamber 6; The second runner 8b that connects periphery flow chamber 6 and second portion volume 7b; Second portion volume 7b; And at the second first flow 4b of the second axle head 3b.

Nature, the flow passage system of hot-rolling 1 also can comprise following scheme: realize the importing and/or the derivation of heat transfer agent via an axle head 3a or 3b.Can use double-way connection to realize flowing, promptly by realizing simultaneously flowing into and flowing out at same axle head such as embedding tube, thus, backflow is directed getting back to same end via the endoporus of hot-rolling.In the case, another axle head can be realized more simply, and/or other function in space can be needing realized at another axle head; For example, can implement the rotary manipulation of hot-rolling subsequently by another axle head.

The material of the metal-back 5 of the shell layer of formation hot-rolling 1 is preferably weldable steel, preferably, and structural steel.Preferably, the material of metal-back 5 is the hardening agent steel.The material of the body 2 of hot-rolling 1 is a cast iron, is preferably spheroidal graphite cast-iron.

Fig. 2 shows the partial enlarged drawing of the part A among Fig. 1, and Fig. 2 shows and metal-back 5 is fixed to the body 2 of hot-rolling 2 and forms periphery flow chamber 6 in metal-back 5.At least at one of borderline region 5a, 5b (in Fig. 2, being the borderline region 5a of metal-back 5) metal-back 5 is fixed to body 2 by welding (being preferably friction welding).The favored area of welding 10 is represented by dotted lines in Fig. 2.Metal-back 5 can be fixed to the shoulder 2c that is formed in the body 2.Metal-back 5 also can be fixed to body 2 by independent parts (not shown), these independent parts are provided with and form around body 2 and are preferably columnar shoulder, and in the case, body 2 has the outer surface 2e of the general cylindrical shape of being preferably, and must remove small quantity of material thus when forming the periphery flow chamber.Preferably, the height of the height of shoulder 2c decision periphery flow chamber 6.For example can be by in the desired region of periphery flow chamber 6, body 2 is processed into diameter less than shoulder 2c, form shoulder 2c.

Replacedly, metal-back 5 can be fixed around at least one axle head 3a, 3b of hot-rolling 1.Such as in conjunction with describing among Fig. 2, can realize said fixing by welding.In the case, shoulder 2c can be arranged to greatlyyer to the distance at the nip edge between on-stream period, and the fatigue load on the metal-back 5 remains on than low value.Shoulder 2c preferably is designed to make the fatigue load on the material on the metal-back 5 and that be used to form shoulder to minimize.Therefore, as mentioned above, shoulder 2c preferably both had been arranged in the zone of axle head 3a, 3b, also was arranged in the zone of body 2, and this also is shown in Fig. 3 and the associated description.

Replacedly or additionally, can be by thread connector 11, in one of them (or in another embodiment of the present invention) of borderline region 5a, 5b at least, metal-back 5 is fixed to body 2 in the zone of above-mentioned shoulder 2c at least one axle head 3a, 3b place.Preferably, periphery flow chamber 6 is set to bear the pressure that equals 2 to 3 crust of heat transfer agent.Do not leak under pressure for periphery flow chamber 6 being sealed at least one borderline region 5a, 5b of metal-back 5, preferably can use at least one seal 12, sealing part 12 can be arranged on end 2a, the 2b of body 2; Or in another embodiment of the present invention, seal 12 can be arranged on axle head 3a, 3b; Preferably, be arranged in the groove 12 that is formed in the shoulder 2c metal-back 5 after the assembling that reclines.

Fig. 3 shows material 2a, the 3a decision design in the borderline region 5a of metal-back 5.In this exemplary embodiment, metal-back 5 is fixed around axle head 3a, and this is designed to make the fatigue load on the metal-back 5 among borderline region 5a, the 5b to minimize.The connector that is provided with around axle head 3a advantageously reduces and even has eliminated needs with respect to the end 2a sealing axle head 3a of body 2.This structure can also remove metal-back 5 to safeguard under the situation of not unloading lower shaft end 3a, 3b from body 2.

Below calculated examples show rounding seamed edge in the material of how determining to be formed in the metal-back 5 along fiber web machine roll length L longitudinally.Under situation shown in Figure 3, the rounding seamed edge comprises two adjacent and fillet diameter r that are mutually related, these two fillet diameter r form the rounded shape of shoulder 2c at axle head 3a place, and metal-back 5 is fixed around axle head 3a, and axle head 3a is fixed to the end 2a of body 2 again.In this calculated examples, the height h of periphery flow chamber 6 is 2mm, and the thickness t of the metal-back 5 that is formed from steel is 10mm.Can use formula (I) and (II) determine the bending stress of rounding seamed edge, wherein σ is a fatigue load, and the elastic modulus E of steel is 210GPa.

$\mathrm{\ϵ}=\frac{t}{2r}---\left(I\right)$

σ＝Eε (II)

Obtain the length L of rounding seamed edge by formula (III):

$L=r\·\sin \left({\cos }^{-1}\left(\frac{r-h}{r}\right)\right)---\left(\mathrm{III}\right)$

If is σ from minimum of a value to peaked fatigue load of allowing _s=70Mpa obtains following radius of corner r by application of formula (I) and formula (II):

$E\frac{t}{2r}<{\mathrm{\&sigma;}}_s\&DoubleRightArrow;r>\frac{\mathrm{<figure-callout\; id="2"\; label="E"\; filenames="HPA00001143643300011.png,HPA00001143643300012.png"\; state="\{\{state\}\}">E</figure-callout>}}{{2\mathrm{\&sigma;}}_s}\&CenterDot;t=\frac{210\mathrm{<figure-callout\; id="2"\; label="GPa"\; filenames="HPA00001143643300011.png,HPA00001143643300012.png"\; state="\{\{state\}\}">GPa</figure-callout>}}{2\&CenterDot;70\mathrm{<figure-callout\; id="10"\; label="MPa"\; filenames="HPA00001143643300012.png"\; state="\{\{state\}\}">MPa</figure-callout>}}10\mathrm{mm}=15000\mathrm{mm}$

By this way, the length L that obtains the rounding corner angle by application of formula (III) is 245mm:

$L=15000\&CenterDot;\sin \left({\cos }^{-1}\left(\frac{15000-2}{15000}\right)\right)=245\mathrm{mm}$

Fig. 4 shows the example of the liquid stream F of the heat transfer agent in the zone of the periphery flow chamber 6 on the outer surface 2e of body 2 of the hot-rolling 1 shown in Fig. 1 of no shell layer and this hot-rolling.

The second runner 8a, 8b in the body 2 of hot-rolling 1 preferably are set at outside fiber web between the on-stream period of hot-rolling 1 and zone that the surperficial 5c of metal-back 5 contacts, thereby can not cause too high thermograde in the fiber web of just handling in the operation process of hot-rolling.

If it is 5 enough hard to 20mm and housing that the wall thickness of metal-back 5 is about, then such as the groove (not shown) such chamber can preferably be formed on the outer surface 2e of body 2, in order to guiding flowing in periphery flow chamber 6.Above-mentioned guide of flow chamber can be along axially or with respect to the axis of this roller the tilting of roller 1, or around the outer surface 2e of body 2 shape in the shape of a spiral.In the case, periphery flow chamber 6 can form shallow chamber, and is advantageously more shallow when not having the guide of flow chamber, and the distortion of metal-back 5 is reduced.

Fig. 5, Fig. 6, Fig. 7 and Fig. 8 show the preferred by way of example of the metal-back 5 of fixing hot-rolling 1 shown in Figure 1.Hot-rolling 1 can be the hot-rolling of calender, and wherein the outermost shell layer 5 (being metal-back 5) towards paper can be by being fixed on the inside body 5 such as shrinking connector (shrink joint).Shell layer 5 is subjected to very big thermal force.The temperature difference between the interior section of shell layer 5 and hot-rolling 1 (for example heat transfer agent and/or body 2) causes the temperature difference in the shell layer 5, and this causes that again shell layer 5 moves vertically, causes that especially end regions 5a, the 5b of shell layer 5 moves vertically.Except that other factors,, just must prevent that shell layer 5 from moving vertically for described contraction connector being worked on request and avoiding being known as the fatigue phenomenon of fretting corrosion.When the core material of the body 2 of hot-rolling 1 and the material of shell layer 5 the problems referred to above can not occur simultaneously, and therefore be difficult to by they being linked together such as welding.Must prevent two end regions 5a, 5b of shell layer 5 axially-movable along two directions.

The fixing hermetically-sealed construction of describing in conjunction with Fig. 2 12 that also comprises of the metal-back 5 that Fig. 5, Fig. 6, Fig. 7 and Fig. 8 illustrate separately.

According to particularly preferred fixed form shown in Figure 5,, metal-back 5 is fixed to groove 13 in the body 2 that is formed at hot-rolling by hoop 14 at least at borderline region 5a, 5b one of them (in Fig. 5) at borderline region 5a.This fixed form can be unloaded lower shaft end 3a, 3b from body 2 when metal-back 5 is remained on the appropriate location.In addition, do not need large-sized screw 11, this be because between groove 13 and the hoop 14 this being connecting of closing form mainly born the load that is applied to point of attachment vertically.When body 2 unloads metal-back 5, can between hoop 14 and metal-back 5, machining go out welding point 16a.Hoop 14 can be regarded cheap and interchangeable connector as, and it can be replaced with new hoop 14 at an easy rate.Above-mentioned machining does not need to corrode body 5, and metal-back 5 corrosion or shortening vertically is very little.

In Fig. 5, fixedly the groove 13 of hoop 14 is formed on the body 2 of hot-rolling 1, preferably, is formed on the surface in the end regions 2a that is in this body of body 2.Hoop 14 is a kind of welding material, is preferably steel.Be fixed to hoop 14 by the border 5a that welds metal-back 5.Weld seam is illustrated as 16a.The cross sectional shape of groove 13 and hoop 14 is preferably wedge shape, is preferably to correspond to each other.The both sides of hoop 14 are arrived body 2 via the both sides of groove 13 with axial force transmission, thereby vertically metal-back 5 are kept in position with respect to body 2.Hoop 14 preferably is installed in the groove 13 under cut state, and the end of cut hoop component is such as being welded together.Owing to other reason, for example, hoop 14 also can be along axially being divided into two of hot-rolling 1, by Reference numeral 15 expressions.In the case, be fixed to first hoop 14 by the border 5a that welds metal-back 5, and by screw 11 that second hoop 15 is fixing; By hoop 14,15 is fixed in the groove 13, promptly available second hoop 15 is realized final fixing.Groove on the body 2 also can use the shoulder (not shown) on the body to substitute, correspondingly, the groove that cooperates with described shoulder can be arranged in the hoop, thus, the both sides of the groove in the hoop are arrived body 2 via the both sides of shoulder with axial force transmission, thereby vertically metal-back 5 are kept in position with respect to body 2.

Fig. 6 shows the interchangeable mode that metal-back 5 is fixed to the body 2 of hot-rolling 1.Among Fig. 6, borderline region 5a by thread connector 11 along hot-rolling 1 radially metal-back 5 is fixed to body 2, and do not have the welding joint.This thread connection need be used large-sized screw 11 and these screws 11 is coupled to the end regions of hot-rolling 1 together with the trip bolt 17 of axle head 3a, 3b.

Fig. 7 shows the interchangeable mode that metal-back 5 is fixed at least one axle head 3a, 3b of hot-rolling 1.Among Fig. 7, by welding metal-back 5 is fixed to axle head 3a, 3b at the edge of end regions 5a.Weld seam is represented with 16b.Replacedly, perhaps as to the replenishing of welding point 16b shown in Figure 7, can be by thread connector 11 ' vertically metal-back 5 is fixed to axle head 3a, in the case, need shell layer for thread connector 11 ' for enough thick.

Hot-rolling 1 shown in Figure 8 comprises at least one flange 18, and flange 18 is fixed between body 2 and at least one axle head 3a, the 3b, and metal-back 5 one of them is fixed to flange at least at borderline region 5a, 5b.Weld seam is represented with 16b.

Hot-rolling according to the present invention be preferably following one of at least: the hot-rolling of the hot-rolling of the squeeze unit of the hot-rolling of the hot-rolling of the hot-rolling of the hot-rolling of glazing calender, the hot-rolling of soft press-polishing machine, long-nip calenders, boots formula calender, the hot-rolling of belt calender, metal-belt calender, drying cylinder, fiber web machine and/or the coating section of fiber web machine.

The roller maintaining method that is used for hot-rolling 1 according to the present invention comprises: to have another metal-back 5 of identical characteristics or different qualities, replace the metal-back 5 that constitutes shell layer.

Preferably, the metal-back 5 of hot-rolling 1 to be replaced is different on the one at least in following characteristic: surface quality, hardness, thickness, the strength of materials, welding applicability, thermal conductivity, hardening capacity.

A kind of method that is used to make the roller (being hot-rolling 1) that is heated and/or cools off, hot-rolling 1 comprises: the body 2 that is used to carry, it has first end 2a and the second end 2b; At least one axle head 3a, 3b, it is fixed to end 2a, the 2b of body 2, and comprises that at least one is used to import and/or derive first flow 4a, the 4b of heat transfer agent; And shell layer, it is used between on-stream period heat being delivered to fiber web or being delivered to heat transfer agent from fiber web from heat transfer agent around body 2; This method comprises: the body of roller that will be to be regulated or the body of hot-rolling with all marginal pores are as the matrix of the body 2 of hot-rolling, the second runner 8a, 8b are set in body 2, and the second runner 8a, 8b are used for heat transfer agent is directed to from the inside of body 2 outer peripheral edges of body; The tubular metal shell 5 that will have about 1 to 20mm wall thickness is set to the shell layer around body 2, forms the periphery flow chamber 6 of heat transfer agent thus between body 2 and metal-back 5, and the periphery flow chamber has about 1 height that arrives 2mm along the radial direction of hot-rolling 1.

Relate to independent " all marginal pores " that be used for heat transfer agent in the body that hot-rolling of the present invention is not included in roller, perhaps need not to use this independent hole guiding heat transfer agent; Replace, roller is divided into two parts substantially, i.e. body 2 and the metal-back 5 with wall of relative thin.

Heat transfer agent flows F as liquid, be directed arriving the outer surface 2e of body 2 via the second runner 8a, 8b in the body 2, and along this outer surface, and randomly also along being formed at this lip-deep flow chamber, and the flow chamber 6 that forms thus is to be closed by the metal-back 5 that is installed on the body 2.Metal-back 5 is preferably extremely thin, thereby the surface of hot-rolling 1 and the thermal insulation layer between the heat transfer agent are also very thin, has only 1 to 2mm thickness.

For example, the body 2 of hot-rolling 1 bears the external load that is applied on the roller, for example the nip pressure in the calender.For example, in typical application, metal-back 5 is pressed towards body 2 in the nip of calender or squeeze unit.Heat transfer agent also plays the effect of lubricant to additivity between metal-back 5 and body 2, and reduces such as the friction and wear that produces in contacting between metal-back and the body that is caused by nip contact.When needing, can be by in oil, using the additive improved lubrication property.For example, the WS of powdery ₂Or MoS ₂Improve the lubrication property under the high temperature significantly.

Utilization is according to hot-rolling 1 of the present invention, when magnetorheological oil (magnetorheological oil) during in magnetorheological oil, can be produced nip shaping effect (nip profilingeffect) as heat transfer agent and with magnet applications.Can be by controlling magnet (a plurality of) in the mode that is fit to and realizing nip shaping effect with the mode positioning magnet that is fit to.In the case, can influence the position of magnetorheological heat transfer agent in the zone of periphery flow chamber 6, and position that can be by magnetic flux is set and intensity flow velocity and the flow (rate) of controlling magnetorheological heat transfer agent, so that being directed to, heat transfer agent needs in the zone that nip is shaped.For example, in the nip zone that the compression of expecting to increase the diameter of hot-rolling and cause fiber web increases, can be by quickening the mobile of heat transfer agent and/or obtaining higher temperature by the flow that increases hot heat transfer agent.

Improve hot-rolling more at large in expectation, for example according to the position of hot-rolling of the present invention with the heat characteristic of known hot-rolling with all marginal pores, can will preferably include hot red-hot tin, receive or the heat transfer agent of mercury particle is introduced in the heat transfer path system of hot-rolling, and the fluid that will comprise particle after heat discharges be derived the heat transfer path system.Preferably, can be by such as this class particle of electromagnetic induction heating, for example tin, sodium or mercury particle.

Under situation in the roll nip relevant with the hot-rolling that is equipped with shell according to the present invention 1 was introduced steam in expectation, metal-back 5 can be provided with the perforation that is used for steam.Thus, vapours can under high pressure be introduced in the heat transfer path system, and is blown from periphery flow chamber 6 via the metal-back 5 that perforation is arranged.

Can improve common hot-rolling and, its objective is big flow and the high flow rate realized in the hot-rolling 1 by for hot-rolling 1 is equipped with the inner loop pump that is used for heat transfer agent, more effectively conduct heat thus according to the heat transfer in the hot-rolling 1 of the present invention.Circulating pump can quicken flowing of heat transfer agent, thus, pressure loss in the heat transfer path system of hot-rolling and the heat transfer agent pipeline before hot-rolling is flowing of limit heat transfer agent not, and the degree during no flow resistance in mobile flow line that reaches heat transfer agent that can make heat transfer agent and the runner.For example, circulating pump can be arranged on the end relevant with oily connector of hot-rolling 1 or end 3a, the 3b of roller, and in the case, circulating pump can obtain its driving power from the rotation of hot-rolling.

Can compensate the Any shape defective of the hot-rolling and the hot-rolling 1 of general cylindrical shape and tubulose by the inside heating/cooling in the body 2 of hot-rolling 1.An example of this shape defect that will be compensated is: via axle head 3a, 3b towards the diameter of the housing of the surrounding structure generation heat loss of fiber web machine and hot-rolling shape defect less than desired diameter.Correspondingly, in some cases, in the enough zones via the housing that enters hot-rolling 1 such as axle head 3a, 3b of unnecessary heat energy, and the diameter of the housing of hot-rolling can be greater than the diameter of expectation.Therefore, can in the body of hot-rolling, (for example in the zone of the end of body 2 2a, 2b) carry out preferably based on " brake shoe " formula heating that rubs, produce compensation heat by the drum type inner surface that one or more friction members is pressed against such as body thus, and can make the external diameter of housing increase.Also can utilize resistor, more add heat with like related ground, the end of the hot-rolling implementation of class.

Hot-rolling 1 can make surface temperature reach high temperature near 300 degree, and because lubricating oil film below metal-back 5, compares when having traditional hot-rolling of crust with use, can also use longer nip length.Can be by old hot-rolling remodeling (especially the body of hot-rolling being retrofited) be made its consistent hot-rolling 1 that obtains with the present invention.Also can implement the maintenance of roller by the metal-back of replacing wearing and tearing with new housing.

Abovely in the mode of example the present invention has been described with reference to accompanying drawing.Yet, the invention is not restricted to the content shown in the figure; But, can in the scope of the creativeness conception that claims limit, revise various embodiment of the present invention.

Claims (20)

1. fiber web machine roll (1) that is used to handle fiber web, described roller (1) comprising: body (2), it has first end (2a) and the second end (2b); At least one axle head (3a, 3b), its be fixed to described body the end (2a, 2b) and comprise at least one be used to import and/or derive the first flow of heat transfer agent (4a, 4b); And shell layer, it is around described body (2), be used between on-stream period, heat being delivered to fiber web or being delivered to described heat transfer agent from described fiber web from described heat transfer agent, it is characterized in that, tubular metal shell (5), it has about 1 to 20mm wall thickness, be set to around the shell layer of the described body (2) of described roller (1), make between described body (2) and the described metal-back (5) the periphery flow chamber (6) that forms heat transfer agent, described flow chamber (6) has about 1 to 2mm height and (4a 4b) is to flow and is communicated with described at least one first flow along the radial direction of described roller.

2. roller as claimed in claim 1 is characterized in that, described metal-back (5) has 1 to 5mm wall thickness.

3. roller as claimed in claim 1 or 2, it is characterized in that, described body (2) is cylindrical shape and tubulose, and at least at the end of described body (2a, one of 2b) comprise second runner (8a, 8b), the described second runner (8a, 8b) (7a 7b) with between the described periphery flow chamber (6) of described body exterior forms to flow and is communicated with at the partial volume of described body interior.

4. as each described roller of claim 1 to 3, it is characterized in that, the flow passage system of described hot-rolling comprises: being and flow being communicated with, at least at an axle head (3a, at least one first flow (4a 3b), 4b), at least in an end of described body (2a, at least one partial volume 2b) (7a, 7b), and at least one group second runner that the described partial volume in the described body is linked to each other with described periphery flow chamber (6) (8a, 8b).

5. as each described roller of claim 1 to 4, it is characterized in that the material of described metal-back (5) is a weldable steel, is preferably structural steel.

6. hot-rolling as claimed in claim 5 is characterized in that, the material of described metal-back (5) is the hardening agent steel.

7. as each described hot-rolling of claim 1 to 6, it is characterized in that the material of described body (2) is a cast iron, for example is spheroidal graphite cast-iron.

8. as each described roller of claim 1 to 7, it is characterized in that described metal-back (5) is at least one borderline region (5a, 5b), by welding (10), preferably be fixed to described body (2) by friction welding (FW), or by weld (16b) be fixed to axle head (3a, 3b).

9. as each described roller of claim 1 to 8, it is characterized in that, described metal-back (5) at least one borderline region (5a, 5b) by thread connector (11) be fixed to described body (2) or axle head (3a, 3b).

10. as each described roller of claim 1 to 9, it is characterized in that described periphery flow chamber (6) is set to bear the pressure that equals 2 to 3 crust of described heat transfer agent.

11. as each described roller of claim 1 to 10, it is characterized in that, (8a 8b) is set at outside described fiber web between the on-stream period of described roller (1) and zone that the outer surface (5c) of described metal-back (5) contacts described second runner in the described body (2).

12. as each described roller of claim 1 to 11, it is characterized in that described metal-back (5) has about 5 to 20mm wall thickness, in the case, be set at such as the chamber of groove on the outer surface (2e) of described body (2), to guide flowing in the described periphery flow chamber (6).

13., it is characterized in that described metal-back (5) has perforation as each described roller of claim 1 to 12.

14. as each described roller of claim 1 to 13, it is characterized in that described hot-rolling is the hot-rolling of the coating section of the hot-rolling of squeeze unit of hot-rolling, drying cylinder, fiber web machine of hot-rolling, the metal-belt calender of hot-rolling, the belt calender of hot-rolling, the boots formula calender of hot-rolling, the long-nip calenders of hot-rolling, the soft press-polishing machine of glazing calender and/or fiber web machine.

15. as each described roller of claim 1 to 14, it is characterized in that, described roller (1) comprises and is fixed on described body (2) and at least one axle head (3a, at least one flange (18) 3b), and (5a 5b) is fixed to described flange (18) by welding (16c) to described metal-back (5) at least one borderline region.

16. as each described roller of claim 1 to 14, it is characterized in that, on the surface of the described body (2) of described roller (1), form groove (13), hoop (14) is fixed to described groove (13) with closing form, and described metal-back (5) is fixed to described hoop (14) by welding (16a).

17. as each described roller of claim 1 to 14, it is characterized in that, on the surface of the described body (2) of described roller (1), form shoulder, comprise that the hoop of groove is fixed to described shoulder with closing form, and described metal-back (5) is fixed to described hoop by welding (16a).

18. one kind is used to safeguard the method according to the fiber web machine roll of claim 1, it is characterized in that, replaces the metal-back (5) that constitutes shell layer with another metal-back (5) that has identical characteristics or have a different qualities.

19. method as claimed in claim 18 is characterized in that, described metal-back (5) to be replaced is different on the one at least in following characteristic: surface quality, hardness, thickness, the strength of materials, welding applicability, thermal conductivity, hardening capacity.

20. a method that is used to make fiber web machine roll (1), described fiber web machine roll (1) comprising: body (2), and it has first end (2a) and the second end (2b); At least one axle head (3a, 3b), its be fixed to described body (2) the end (2a, 2b) and comprise at least one be used to import and/or derive the first flow of heat transfer agent (4a, 4b); And shell layer, it is around described body (2), be used between on-stream period, heat being delivered to fiber web or being delivered to described heat transfer agent from described fiber web from described heat transfer agent, it is characterized in that, the body of the roller by will be to be regulated or the body of hot-rolling with all marginal pores are as the matrix of the described body (2) of described roller (1), in described body (2), be provided for heat transfer agent is directed to from the inside of described body (2) the second runner (8a of the outer peripheral edges of described body (2), 8b) the tubular metal shell (5) that will have about 1 to 20mm wall thickness is made as the shell layer around described body (2), make between described body (2) and described metal-back (5) the periphery flow chamber (6) that forms described heat transfer agent, described periphery flow chamber (6) has about 1 to 2mm height along the radial direction of described hot-rolling (1).

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