EP0614736B1 - Anordnung zum Kontrollieren einer Plattenpresse - Google Patents

Anordnung zum Kontrollieren einer Plattenpresse Download PDF

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Publication number
EP0614736B1
EP0614736B1 EP94102198A EP94102198A EP0614736B1 EP 0614736 B1 EP0614736 B1 EP 0614736B1 EP 94102198 A EP94102198 A EP 94102198A EP 94102198 A EP94102198 A EP 94102198A EP 0614736 B1 EP0614736 B1 EP 0614736B1
Authority
EP
European Patent Office
Prior art keywords
press
arrangement
rods
push
thickness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94102198A
Other languages
English (en)
French (fr)
Other versions
EP0614736A1 (de
Inventor
Lars-Otto Sislegard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet AB
Original Assignee
Sunds Defibrator Industries AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sunds Defibrator Industries AB filed Critical Sunds Defibrator Industries AB
Publication of EP0614736A1 publication Critical patent/EP0614736A1/de
Application granted granted Critical
Publication of EP0614736B1 publication Critical patent/EP0614736B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/20—Moulding or pressing characterised by using platen-presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/24—Control arrangements for fluid-driven presses controlling the movement of a plurality of actuating members to maintain parallel movement of the platen or press beam

Definitions

  • This invention relates to an arrangement for controlling the thickness of board products during the pressing in board presses, particularly presses with few openings.
  • the mats are compressed under pressure while simultaneously heat is supplied from the press surfaces consisting of the heating plates of the press.
  • the mats are compressed to a final thickness whereafter in an application at the manufacture of fibre board according to the dry method or of particle board, a hot-setting glue cures and provides the board with sufficient strength for the pressing to be completed.
  • a hot-setting glue cures and provides the board with sufficient strength for the pressing to be completed.
  • natural glue substances in the fiber mat yield the necessary strength after heating and drying.
  • Other types of products pressed under heat and pressure can also be a possible choice.
  • Spacing strips in most cases are attached along the long sides of the press, outside the press material, or in the vicinity of press cylinders, placed outside the press material. Spacing strips, as the term indicates, can be used only for controlling a certain predetermined final thickness. The thickness of the spacing strip has been determined at the manufacture and cannot be changed thereafter, if the boards would show to be thinner or thicker than desired, even if the spacing strips happen to have the ideal thickness. Such deviations can occur for several reasons. One reason is that spacing strips and countercurrent surfaces after some time of operation are coated with material from the press material. Thickness deviation also can occur when the hydraulic system of the press and the press tables are designed so that loads arise which are greater than required by the mat, resulting in deflections across the press and thereby in thickness deviations.
  • Spacing strips can be used only for controlling the final thickness. The movement of the press toward final thickness cannot be affected by this equipment.
  • Electric position scanners can be either of limit position type or position measuring type.
  • the simplest one is the limit position type where the position must be changed for each thickness to be pressed. Due to hysteresis in the limit position proper and to errors arising at position adjustment, these systems are not sufficiently accurate, either, and show most of the weaknesses of spacing strips.
  • transmitters of position measuring type, of the type linear potentiometers or the like the adjustment of nominal value thickness can be made simplified from a central control panel. The accuracy of this equipment is not at optimum, either, for presses with few openings.
  • One weakness of the electric systems for position scanning is, that the signal, which normally must be amplified, secondarily controls a solenoid of a hydraulic valve controlling the pressure in the cylinder. There are, thus, several steps between measurement and action. Another disadvantage, especially with limit positions, is that only the final position can be controlled.
  • hydraulic direct acting position valves can be used, whereby a very accurate direct thickness control is obtained.
  • One disadvantage is, thst thickness adjustments, either fine adjustment or change to another thickness, must be carried out at the press by changing a small spacer for every valve.
  • Another disadvantage is, that only the final thickness can be controlled. Hydraulic direct acting position valves have been used with great success for achieving narrow thickness tolerances.
  • the present invention has the object to improve the pressing process, so that the distance between the heating plates can be maintained equal at all position valves, not only at the final position, but also both during the compression process toward the final position and during the pressure reduction process, to control these processes in a predetermined way and also to improve the position accuracy in all positions.
  • Fig. 1 is a lateral view of a press with the arrangement according to the invention
  • Fig. 2 is a view from above of the press
  • Fig. 3 is a cross-section of the position valve in starting position
  • Fig. 4 is a cross-section of the position valve in pressure stop position
  • Fig. 5 is a cross-section of the position valve in pressure reducing position
  • Fig. 6 shows a press sequence
  • Fig. 7 shows an unfavourable density profile of a pressed disc
  • Fig. 8 shows a favourable density profile.
  • a ⁇ ress is shown with cylinders 1,upper press table 2 and lower press table 5 with upper and, respectively, lower heating plates 3, mat 4 to be pressed and a force absorbing structure 6.
  • a position valve 7 is mounted on the lower press table 5.
  • the position valves 7 are actuated mechanically by ball-screws 8 with push-rod end 9,attached via holds 10 on the upper press table 2. (The position valves and holds can be mounted directly on the respective heating plate). All ball-screws can be operated simutaneously via the link arrangement 11 located on the upper press table 2 and driven by a shifting motor 12 (stepping motor, servo-motor or the like) via a reduction gear 13.
  • the system also comprises a stroke limiter 14, miter gears 15 and 16 and a suitable number of couplings 17.
  • the position valves 7 are connected via lines 31 each to a cylinder 1 and receive pressure supply from a common line system 18 receiving its pressure from a pressure source 19.
  • the position valves 7 are also connected to a common line system 20 connected to a tank 21.
  • the system further includes a position transmitter 22,preferably designed as an absolute-coded (GREY-coded) encoder.
  • Figs. 3,4 and 5 the position valves are shown in greater detail, with stop end 30,inset 23, piston 24,spring 25, piston 26,piston 27, spring 28 and intermediate piece 29.
  • Fig. 3 the starting position is shown where the spring 25 has its greatest length.
  • the connection between the pump 19 here is open via the line 18 for pressure supply at the line 31 to the cylinder 1.
  • Fig. 4 the position is shown when the piston 24 just gets into contact with the abutment plane on the piston 26 whereby the connection between the pressure supply 18,19 and the cylinder 1 is closed.
  • Fig. 3 the position valves are shown in greater detail, with stop end 30,inset 23, piston 24,spring 25, piston 26,piston 27, spring 28 and intermediate piece 29.
  • Fig. 3 the starting position is shown where the spring 25 has its greatest length.
  • the connection between the pump 19 here is open via the line 18 for pressure supply at the line 31 to the cylinder 1.
  • Fig. 4 the position is shown when the piston 24 just gets into contact with the abutment plane on the piston 26 whereby
  • the pressure liquid is directed from the common line system 18 via all of the position valves 7, which then are in open position according to Fig. 3, to the cylinders 1, whereby the upper press table 2 together with the ball-screws 8 move downward.
  • the ball-screws have been set by the shifting motor 12 so that they are in a suitable position.
  • the piston 24 moves down to the abutment plane on the piston 26.
  • the connection to the pressure system 18,19 is broken, and the press table 2 stays in this position.
  • the piston 26 moves a fraction of a millimeter downward and opens the connection to the tank 21 according to Fig. 5, whereby the pressure in the cylinder 1 is self-adjusted so that the desired position is maintained. If for some reason the mat would expand so that the distance between the heating plates 3 increases, the tank connection is closed and the connection to the pump 19 is opened, so that the pressure is increased to the required level in order to maintain the correct thickness.
  • the system includes safety means against erroneous settings and operating manners.
  • the position valves 7 are constructed so that they allow for a relatively large overtravel past the intended control position, whereby the system is protected against breakdown if a wrong board thickness has been set from the control system, or if a wrong mat has been fed into the press.
  • a typical pressing process is shown, where time is the abscissa and table position and pressure are the ordinate.
  • the table position farthest to the left and, respectively, farthest to the right corresponds to open press. It can be assumed, that the position described above of the ball-screws 8 corresponds to the table position L1 in the diagram. It is intended to move the press table 2 from L1 with a ramp (linear or curved) to L2 on time T2. In subsequent periods of time the press table is advanced successively to the final position L4, which is maintained while the glue hardens.
  • the pressure increases first to a maximum pressure, Pmax, and then varies responding to the pressing conditions, for example as shown in Fig. 6.
  • the control instructions for achieving this motion pattern is programmed in a programmable control syetem, a so-called PLC-equipment, microcomputer or the like.
  • a programmable control syetem a so-called PLC-equipment, microcomputer or the like.
  • PLC-equipment a so-called PLC-equipment, microcomputer or the like.
  • the system is fed-back thanks to the position transmitter 22.
  • the invention renders it possible to change a desired boardthickness in a stepless manner from the switchboard without production loss.
  • a given thickness can be finely trimmed by changing the nominal value for all ball-screws 8 from the switchboard and/or changing the individual position valves by changing the insets 23 at the valve in question.
  • the position of the ball-screws can be adjusted very accurately, within 0.01 mm, by a suitable gear change. (The gear ratio of the system with the ball-screws can be chosen so that a turning of the motor shaft by 70 degrees corresponds to a movement of the push-rod end of 0.01 mm).
  • the board thickness can hereby be held at a very narrow tolerance.
  • a gain of the magnitude 0.1 mm can be expected, which at the same production as above corresponds to an annual saving of SEK 500.000.
  • a great advantage of position valves with seat function, compared with conventional sliding valves, is that a set position is held constant for a very long time, while the edges of a sliding valve are eroded away, whereby the slide is displaced, which in its turn results in wrong board thickness.
  • a further advantage of the invention is that pressure reduction and degassing of the boards according to times T6, T7 and T8 in Fig. 6 can be controlled very precisely and uniformly about the entire press, whereby the degassing process is softened in spite of the fact that the times can be reduced.
  • Time gains of the magnitude 2-4 seconds have been observed at pressings in full scale. Every second the pressing time is shortened corresponds at the same production as above to an annual saving of SEK 150.000.
  • a position valve 7,for example, can be used for two cylinders 1,if the rigidity of the press tables 2,5 is deemed sufficient.
  • a second variant is to let the ramps move to a thinner than final thickness and thereafter move back.
  • a third variant is to use traditional pressure levels or ramps alternatingly with position control according to the invention.
  • a fourth variant is to utilize the invention for continuous presses. In this case a variable gear in the link system can be required, so that the admission key of the press gets the intended openings.
  • the design of the equipment of course, can also be varied within the scope of the claims.
  • the piston 26 of the position valve 7,for example can for practical reasons be designed to consist of several piston portions, which does not affect the function or above description.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Press Drives And Press Lines (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Control Of Presses (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Claims (9)

  1. Anordnung zum Steuern der Dicke von plattenförmigen Produkten (4) während des Preßvorganges in einer Plattenpresse mit einem ersten und einem zweiten Preßtisch (5,2), wobei die Preßkraft durch mehrere hydraulische Preßzylinder (1) übertragen wird,
    dadurch gekennzeichnet,
    daß eine Anzahl von hydraulischen Positionsventilen (7) in einem Abstand voneinander auf beiden Seiten der Presse an dem ersten Preßtisch (5) und entsprechende Schubstangen (9) an dem zweiten Preßtisch (2) angeordnet sind, wobei die Schubstangen (9) durch einen gemeinsamen Verstellmotor (12) gleichzeitig einstellbar sind.
  2. Anordnung nach Anspruch 1,
    dadurch gekennzeichnet,
    daß Kugelschrauben (8) zum Einstellen der Schubstangen (9) vorgesehen sind.
  3. Anordnung nach Anspruch 1 oder 2,
    dadurch gekennzeichnet,
    daß ein Verbindungssystem (11) vorgesehen ist, um die Einstellung des Verstellmotors (12) auf die Einstellung der Schubstangen (9) zu übertragen.
  4. Anordnung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet,
    daß die Positionsventile (7) als Doppelsitzventile mit verminderter Einstellkraft ausgelegt sind.
  5. Anordnung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet,
    daß der Verstellmotor (12) mit einem Steuerprogramm zum Einstellen der Schubstangen (9) während des Preßvorganges vorprogrammiert ist.
  6. Anordnung nach Anspruch 5,
    dadurch gekennzeichnet,
    daß das Steuerprogramm aus Rampen aufgebaut ist.
  7. Anordnung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet,
    daß jedes Positionsventil (7) mit einem Preßzylinder (1) verbunden ist.
  8. Anordnung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet,
    daß alle Positionsventile (7) von einer gemeinsamen Druckquelle (8) aus mit Druck versorgt werden.
  9. Anordnung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet,
    daß ein Hubbegrenzer (14) als Überlastschutz zwischen dem Verstellmotor (12) und den Schubstangen (9) vorgesehen ist.
EP94102198A 1993-03-09 1994-02-12 Anordnung zum Kontrollieren einer Plattenpresse Expired - Lifetime EP0614736B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9300772A SE470583B (sv) 1993-03-09 1993-03-09 Anordning för styrning av en skivpress
SE9300772 1993-09-24

Publications (2)

Publication Number Publication Date
EP0614736A1 EP0614736A1 (de) 1994-09-14
EP0614736B1 true EP0614736B1 (de) 1996-06-26

Family

ID=20389156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94102198A Expired - Lifetime EP0614736B1 (de) 1993-03-09 1994-02-12 Anordnung zum Kontrollieren einer Plattenpresse

Country Status (6)

Country Link
EP (1) EP0614736B1 (de)
AT (1) ATE139726T1 (de)
DE (1) DE69400265T2 (de)
DK (1) DK0614736T3 (de)
ES (1) ES2089868T3 (de)
SE (1) SE470583B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5634398A (en) * 1996-03-22 1997-06-03 The Coe Manufacturing Co. Panel press with movable platens which are individually controlled with position-sensor transducers
DE102017207993A1 (de) 2017-05-11 2018-11-15 Homag Gmbh System zur Bearbeitung von Wertstücken

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE432221B (sv) * 1980-06-30 1984-03-26 Karlstad Mekaniska Ab Anordning for kombinerad leges- och hastighetsreglering av ett hydrauliskt manovrerat pressbord
JPH04231114A (ja) * 1990-12-28 1992-08-20 Yasuyuki Moriyama 油圧式プレスブレーキ

Also Published As

Publication number Publication date
SE9300772L (sv) 1994-09-10
DE69400265D1 (de) 1996-08-01
ES2089868T3 (es) 1996-10-01
DE69400265T2 (de) 1996-11-28
DK0614736T3 (da) 1996-08-05
ATE139726T1 (de) 1996-07-15
EP0614736A1 (de) 1994-09-14
SE470583B (sv) 1994-10-24
SE9300772D0 (sv) 1993-03-09

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