JPH0450393A - Pressing device foe protecting elastic roll in calender - Google Patents

Abstract

PURPOSE:To protect elastic rolls by preventing abrupt action by using a free control system and slowly pressurizing. CONSTITUTION:In calendering web of paper or magnetic tape, etc., by a supercalender, rolls 1 composed of superposed metallic rolls 1A and 1C and resinous elastic rolls 1B and 1D in multistage are operated from a state of its own weight to pressurized state. In said process, a free control system in which the pressurizing pressure is slowly raised (pressed) by a time control through a timer (pressurizing-setting time) is adopted to protect said elastic rolls.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention uses a supercalender to calender webs such as paper, films, and magnetic tapes, so that a resin-based elastic roll can be changed from its own weight state to a pressurized state. When operating, use the free control system to slowly increase pressure (
This invention relates to a pressurizing device for applying gentle pressure) and protecting the elastic roll.

[Conventional technology]

Generally, when calendering is performed, metal rolls IA, IC, elastic rolls IB, ID, etc. shown in FIG. 1 are used. In the multistage roll 1, the web is polished to give gloss and smoothness by applying pressure from hydraulic cylinders 2A and 2B.

To apply the pressure and self-weight, oil is supplied from the hydraulic unit 17, the motor 16 is driven to move the pump 15, the line filter 14, the check valve 13, the accumulator 12, the source pressure setting relief valve 11, and the pressurization and separation are performed. Control solenoid valve 10, dead weight control solenoid valve 9, dead weight pressure setting relief valve 8, check valve 7, and pressurized pressure setting pressure reducing valves 5A, 5 separated into operation side A and drive side B.
B, flow rate adjustment valves 4C, 4D and hydraulic cylinders 2A, 2
Give at B. On the other hand, when separating the ports, the pressurizing equipment is removed and the flow rate regulating valves 4A and 4B are added.

Next, separation of the multistage rolls, self-weight and pressurization, or separation and pressurization operations are performed, and during the above-mentioned separation or pressurization, it is customary to apply pressure after passing the web. or,
The operating sources for separation, dead weight, and pressurization are generally hydraulic or pneumatic.

Normally, elastic rolls for super calendars are often made of cotton rolls. In recent years, the above-mentioned elastic rolls have come to be of the surface resin type, and have come to be widely used in combination with webs. However, since elastic rolls have high hardness and low elasticity, applying an impact load during pressurization may cause cracks or damage on the roll surface. The reason for this is the hydraulic system of the super calendar. When pressurization is performed using its own weight (or separation), the pressure is instantly increased to the set pressure, and an impact load is applied to each roll, causing an impact.

This results in a hydraulic system.

The hydraulic system is a hydraulic pressure adjustment type using two sets on the operation side A and drive side B, and the source pressure (the pressure of the pump 15) is set by the source pressure setting relief valve 11. One of the reasons is that the pressure cannot be confirmed sufficiently by pressure detection because the pressure is set in two series from then on until the hydraulic cylinders 2A and 2B.

If one series of pressure regulating valves malfunctions or foreign matter is mixed in, and the pressure varies greatly, the elastic rolls may be deformed (crushed), damaged, or broken, resulting in defective products.

Even when changing from self-weight to pressure, it moves suddenly and may damage the resin-based elastic roll.

[Problem to be solved by the invention]

The above-mentioned conventional technology has the following problems when operating a resin-based elastic roll from a self-weight state to a pressurized state. Firstly, using traditional hydraulic system cannot prevent the elastic roll from being damaged, cracked and broken.

The problem is that the hydraulic system has to adjust the pressure in two sets, one on the operation side and one on the drive side. Therefore, the present invention has been proposed in view of the above circumstances, and provides that a free control system is used to control the calendar, and this system increases the pressure in the slow motion to protect the elastic roll. purpose.

[Means to solve the problem]

In order to achieve the above object, the present invention has the following configuration. The structure is a super calender, which is used to calender webs such as paper, film, and magnetic tape, and when operating the rolls, which are stacked in multiple stages of metal rolls and resin-based elastic rolls, from a state under their own weight to a state under pressure. The elastic roll is protected by a free control system that gradually increases (presses) the pressurized pressure by time control using a timer (pressure setting time).

[Function] A pressurizing device for protecting elastic rolls in a calender uses a free control system to increase the pressure of the elastic rolls (rapidly It plays a role of protecting the resin-based elastic roll by avoiding excessive pressure.

[Example] The following will explain the calendar to which the present invention is applied, with reference to FIGS. 2 to 4, which show the relationship between the calendar's wiring, piping system, set pressure, time, etc. do.

The calender device consists of a roll 1, metal rolls IA, IC, and resin-based elastic rolls IB, ID (a portion of which is shown in Fig. 2) stacked in multiple stages. It is then finished and wound. The calender device requires the following items to protect the elastic rolls IB and ID. First, when operating a resin-based elastic roll from a self-weight state to a pressurized state, the free control system in the calendar control panel 18 is used to slowly increase the pressure, and the pressure is suddenly increased. This protects the elastic roll from pressure.

Next, when calendering the web, it is operated under pressure as shown in FIG. For pressurization, the oil from the hydraulic unit 17 is driven by the motor 16 to move the pump 15, and the oil from the pump 15 is transferred to the original pressure setting (pump pressure ), the source pressure setting relief valve 11 is used. Furthermore, the oil passes through the pressurization and separation control solenoid valve 10, and the pressurization pressure setting pressure reducing valve 5A, 5.
B and pressure switch 3A, 3B to hydraulic cylinder 2A
, several types of equipment are used up to 2B. At that time, in the unlikely event that the pressure decreases or increases in one direction due to equipment failure or foreign matter contamination, the following treatment methods are available. The pressure change is transferred from the hydraulic unit 17 after the pressure reducing valves 5A and 5B to the hydraulic cylinder 2A.

It is desirable to provide pressure switches 3A and 3B near 2B. The pressure switches 3A and 3B also have the role of detecting abnormal pressure during operation in a pressurized state, and operating each roll from a pressurized state to a separated state, as well as stopping the super calender. . In addition, the above pressure switches 3A and 3B are mainly two-contact pressure switches, and the pressure α is set to 5 kg/aft with respect to the pressurized pressure.
Within or as small as possible, abnormal pressure can be detected more sensitively.

Next, the above details will be explained.

First, in order to maintain the self-weight state, set the self-weight pressure setting relief valve 8 to a pressure that makes complete contact with the operation side A and drive side B of all rolls in the self-weight state, and turn the self-weight control solenoid valve 9. Controls (excites) and pressurizes the oil at the self-weight pressure via the check valve 7. It is fed into the hydraulic cylinders 2A and 2B to bring it under its own weight.

Also, during self-weight operation and when separating multi-stage rolls, the self-weight speed and separation speed can be adjusted depending on the web base used. Make side B even. At that time, the self-weight speed and self-weight synchronized flow rate regulating valve (4
C24D) is performed on the operating side 4C and the driving side 4D.

Separation speed and separation tuning flow rate adjustment valves (4A, 4B),
This is done on the operating side 4A and the driving side 4B. Furthermore, due to changes in oil temperature and pressure, it is necessary to take into account changes in pressure increase rate and synchronization rate.

Second, the pressurizing operation will be explained.

It is necessary to perform the pressurization operation as soon as possible after the self-weight operation is completed; if it is delayed, the loss of base will increase. Therefore, the pressurization operation is performed by setting the pressurizing pressure setting volume of the amplifier of the pressurizing pressure setting current control valve 6 or the pressurizing setting time (including a timer) to reach the set pressure in the calendar control panel 18. Set by volume. Therefore, by the pressurization operation, the pressurization separation control valve 10 is controlled (excited), and the pressurization setting pressure is sent to the hydraulic cylinders 2A, 2B, and the self-weight control solenoid valve is controlled. 11 (non-excitation). Therefore, the check valve 7 prevents the set pressure from flowing back to the dead weight side.

In addition, when operating side A and drive side B are used at the same pressure, the pressurization setting pressure can be adjusted in detail by setting the secondary side of the pressurization pressure setting pressure reducing valves 5A and 5B higher than the pressurization setting pressure. Pressurization is performed using a pressure set in a control amplifier in a control panel 18 (not shown). Furthermore, if a pressure difference is provided between the operation side A and the drive side B, the pressurization pressure setting pressure reducing valve 5A
, 5B is used, and a pressure difference is created on the operation side or drive side on the secondary side of the pressure reducing valves 5A and 5B.

In this case, depending on the performance of the pressure reducing valves 5A and 5B, it is necessary to create a pressure difference between the negative side and the secondary side, and the pressure on the negative side is also increased using the control amplifier described above. It is necessary to set it to .

Therefore, when operating from the self-weight state to the pressurized state, when the above-mentioned current control valve has no current, the control is in the fully open direction for a certain period of time, so a separation operation occurs. During self-weight operation, it is also necessary to apply a constant current to the current control valve in advance so as to generate a pressure somewhat higher than the self-weight set pressure.

The calendar control panel 18 also includes equipment and systems shown in FIGS. 3 and 4, such as control valves, which are not shown on the surface of FIG.
Illustrations are included. By the way, the operation of the current control valve is to control the pressurized pressure over time via a timer (pressure increase setting time) when operating the rolls, which are stacked in multiple stages using metal rolls and resin-based elastic rolls, from a state under their own weight to a pressurized state. By control,
Figure 3 shows a free control system with a gradual pressure increase method that increases the pressure in any time for any set pressure, and a control system with a time proportional system in which the pressure rise is constant up to the maximum pressure and the pressure increase time is proportional to the pressure increase time shown in Figure 4. can be controlled. In any of the above systems, the pressure increase time can be adjusted arbitrarily, but in the time proportional system in the latter stage, even if you set the time arbitrarily, the time will change depending on the pressure setting in the pressure increase time to the maximum pressure. . Therefore, the resin-based elastic roll can be protected using the above-mentioned system of gradual pressure increase.

〔Effect of the invention〕

Resin-based elastic rolls have high hardness and are comparable to general elastic rolls (
Since the elastic force is small compared to other materials, sudden pressure and impact loads can cause unexpected damage.

Therefore, in the hydraulic system, a free control system is used to gradually increase the pressure when pressurizing, which has the effect of increasing the protection of the elastic roll from sudden pressure loads or impact loads, and from roll damage, locking, and breakage. be.

[Brief explanation of the drawings] Figure 1 shows the wiring and piping system diagram of the conventional super calendar, Figure 2 shows the wiring and piping system diagram of the super calendar of the present invention, and Figure 3 shows the calendar control panel shown in Figure 2. FIG. 4 is a diagram showing a table of the intervening free control system. FIG. 4 is a diagram showing a table of the control system intervening in the calendar control panel of FIG. ■...Roll, IA, IC...Metal roll, IB. ID...Elastic roll, 2A, 2B...Hydraulic cylinder, 3A, 3B...Pressure switch, 4A, 4B...Separation speed, separation tuning flow rate adjustment valve, 4C, 4D...Self weight speed, own weight Synchronized flow rate adjustment valve, 5A, 5B... Pressurized pressure setting pressure reducing valve, 6... Pressurized pressure setting current control valve, 7...
Check valve, 8... Self-weight pressure setting relief valve, 9
... Self-weight control solenoid valve, 10 ... Pressure, separation control solenoid valve, 11 ... Source pressure setting relief valve, 12 ... Accumulator 13 ... Chietsuki pulp, 14 ...
Line filter 15... Pump, 16... Motor 17... Hydraulic unit, 18... Calendar control panel, A... Operation side, B... Drive side. Figure Patent Applicant: Minamisenju Seisakusho Co., Ltd. Representative: Masashi Kikukawa

Claims (1)

[Claims] When calendering webs such as paper, film, and magnetic tape with a supercalender, the pressure applied when operating the rolls stacked in multiple stages of metal rolls and resin-based elastic rolls from a state under their own weight to a state under pressure. The gradual boost (
A pressurizing device for protecting an elastic roll in a calender, characterized in that the elastic roll is protected by a free control system that applies pressure.