JPH0643000U - Doctor knife support device - Google Patents

Abstract

(57) [Summary] [Purpose] This invention aims to provide a doctor knife supporting device which has a high efficiency of removing dust adhering to the roll surface and is stable. (Structure) In a doctor knife supporting device in which a doctor knife is pivotally supported by a supporting base via a supporting pin so that the doctor knife is clamped by a pressing plate, the lower surface of the doctor knife is located at the axial center point of the supporting pin and the roll surface. Doctor knife support device arranged along a straight line connecting the knife contact of.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a doctor knife support device for removing the dust adhering to the roll surface of a papermaking machine or the like with a doctor knife in pressure contact with the roll surface, and in particular, the blade edge of the doctor knife is brought into contact with the roll surface with equal pressure. The present invention relates to a doctor knife support device having high efficiency in removing dust.

[0002]

[Prior art]

 Conventionally, the blade edge of the doctor knife is set to abut at a predetermined angle θ with respect to the tangent line of the roll, but the knife holder that supports the doctor knife is immovable and fixed, and swingable. It has been known.

[0003]

[Problems to be solved by the device]

 When the knife holder is fixed, the scrap surface on the roll surface is excellently scraped off, but the shock absorption is poor. Further, when the knife holder is swingable, there is a problem in that the knife easily escapes and is scraped off, which lowers the efficiency. In view of the above problems, the present invention was developed with the object of providing a doctor knife support device having a high scraping efficiency and an excellent shock absorbing property corresponding to the rotation of a roll.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, this invention makes a knife holder supporting a doctor knife pivotally supported by a pivot pin so that it can swing like a seesaw, and an elastic support is provided on the back surface of the holder to provide a roll surface for the doctor knife. The technical measures were taken to set the extension line of the lower surface of the doctor knife so that it would pass through the axis of the pivot pin, in order to buffer the pressure contact with and shock.

[0005]

The present invention configured as described above has the following operation. That is, when the doctor holder is formed, for example, in a V shape in cross section, when the bent portion is pivotally attached by a horizontal pivot pin, the rear portion is upright and the front portion is inclined downward. In this state, if elastic supports are placed on the front and rear faces of the knife holder, the knife holder can swing like a seesaw around the pivot pin, but the elastic of the elastic support can be changed. The tip of the knife is pressed against the roll by the force. On the other hand, the doctor knife is attached to the front part of the knife holder, and the extension line of the lower surface of the knife passes through the axis of the pivot pin.Therefore, if the intersecting angle between the lower surface of the doctor knife and the tangent of the roll is θ, The blade edge of will contact the tangent of the roll at an angle of θ. Therefore, as the roll rotates, the force applied from the tip to the rear of the doctor knife is received at the center of the pivot pin, so that the scraping effect is high and the doctor knife is less likely to swing. The elastic support at the rear of the knife holder has the effect of pressing the blade edge of the knife against the roll, and the elastic support at the front has the effect of separating the knife from the roll. Hard to apply.

[0006]

【Example】

 An embodiment of this invention will be described with reference to the drawings. FIG. 1 is a side view of a doctor knife supporting device (hereinafter simply referred to as a supporting device). The supporting substrate 2 of the supporting device 1 is in the shape of a hollow box and is horizontally long and longer than the roll width. A mounting member 3 having a substantially U-shaped side face is fixed to the front surface of the supporting base, and a pivot pin 5 is horizontally mounted via a bracket 4 at the upper and lower intermediate portions of the mounting member 3. In addition, a knife holder 6 having a main portion 6A and a tail portion 6B formed into a substantially V-shaped side face is pivotally attached to the pivot pin 5 so that it can swing. A tubular elastic support 7.7 is arranged between the rear surface of the front and rear edges of the knife holder 6 and the mounting member 3. Further, a knife supporting surface 6C is formed by a notch on the upper end of the lower end of the main portion 6A of the knife holder 6, and an extension line L of the knife supporting surface 6C passes through the axis of the pivot pin 5 at the upper portion, and a lower portion at the lower portion thereof. It is set so as to intersect the tangent line S of the roll R at an angle of θ. The knife support surface 6C is provided with the rear lower surface of the doctor knife 8 and the upper surface of the knife holder 6 is fixed to the upper surface of the knife holder 6 with screws 9A ... To fix the doctor knife 8. The doctor knife 9 is a publicly known one. The intersection angle θ of the lower surface line L of the doctor knife 8 (same as the extension line of the knife supporting surface) intersecting the tangent line S is set in the range of 20 ° to 40 °.

In the present invention configured as described above, when the roll R rotates in the direction of the arrow, the tip of the doctor knife 8 contacts the roll R at an intersection angle of θ with the tangent line S, and the tail 6B of the knife holder 6 is in contact. It is possible to scrape off the dust adhering to the surface of the roll R 1 by pressing it in the direction of the line of force P by the elastic support 7 of FIG. Even if a strong dust is adhered to the doctor knife 8 and a strong force is applied to the lower surface line L direction, the force is received by the axial center of the pivot pin 5, so that the dust adheres strongly. Can also be easily deleted. Furthermore, when a force is applied to the doctor knife 8 in the lower surface direction, the elastic support 7 on the back surface of the main portion 6A of the knife holder has a cushioning and elastic action, and the doctor knife 8 is restored to the normal position. As can be seen in the figure, both elastic supports 7.7 are located above the pivot pin 5 but farther from the pivot pin 5. That is, if both elastic supports 7.7 have the same elasticity, the knife holder 6 repels with the same elasticity and is stable. However, according to the principle of leverage, the elastic support located far from the pivot pin 5 works more favorably, so that the force for pressing the blade edge of the doctor knife 8 in the direction of the force line P acts to balance it. Is. This means that the blade tip of the doctor knife 8 is lowered to the X-ray in FIG. 1 to balance the force due to the force relationship between the two elastic supports 7.7 and the principle of leverage. Since the lower elastic support 7 pushes up the knife holder main portion 6A by contacting with, the contact pressure of the knife 8 against the roll R in the direction of the force line P is very small. Of course, the degree of wear of the knife 8 is small, but when removing dust, the impact force at the time of removal is applied in the L line direction and is received by the pivot pin 5, so the removal efficiency is high and the doctor knife 8 swings. There is a feature that does not.

FIG. 2 is a side view of the supporting device 1 showing the second embodiment. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, the knife holder 6 is characterized in that the tail portion 6B is formed orthogonally to the base end portion of the main portion 6A and has a substantially T-shaped side surface. The second embodiment is characterized in that the pressing direction of both elastic supports 7.7 is parallel to the doctor knife lower surface L, as can be seen in the figure. This means that from the blade edge of the knife 8 to the roll R. The contact pressure applied in the direction of the force line P can be reduced as much as possible, and the efficiency of removing dust is high.

[0009]

[Effect of device]

 As described above, the present invention is designed so that the extension of the lower surface of the doctor knife supported by the knife holder passes through the axis of the pivot pin pivotally attached to the knife holder, so that the debris on the roll surface is removed. Since the impact force applied to the knife during removal is received by the pivot pin along the knife bottom line, the removal efficiency is excellent. Further, since the extension of the knife lower surface line passes through the center of the pivot pin, the knife does not easily swing even with the impact force caused by the rotation of the roll, and the removal of the dregs is made uniform.

[Brief description of drawings]

FIG. 1 is a side view of a supporting device showing a first embodiment.

FIG. 2 is a side view of a supporting device showing a second embodiment.

[Explanation of symbols]

 1 Support Device 2 Support Base 3 Support Material 4 Bracket 5 Pivot Pin 6 Knife Holder 6A Main Part 6B Rear 6C Knife Support Surface 7 Elastic Support 8 Doctor Knife 9 Press Plate R Roll S Tangent Line L Knife Bottom Line

Claims (2)

[Scope of utility model registration request] 1. A doctor knife supporting device in which a doctor knife is sandwiched by a pressing plate on a doctor holder which is pivotally supported by a supporting base so as to be vertically swingable, and the doctor knife is provided with an axial center point of the pivot pin. A doctor knife support device characterized in that the lower surface of the knife is placed along a straight line connecting the knife contact on the roll surface. 2. A three-pronged portion of a doctor holder having a substantially T-shaped cross-section is pivotally supported by a pivot pin extending horizontally on a front surface of a supporting base, and a knife supporting surface is formed on an upper surface of a leading end of a main portion of the doctor holder.
The knife support surface is set so that its extension line passes through the axis of the pivot pin, the doctor knife lower surface is applied to the knife support surface, and is pressed and fixed with a pressing plate from above, and the rear surface of the tail portion of the doctor holder is elastic. A doctor knife support device comprising a support.