JPH03224668A - Vibrating sieve for high-temperature material - Google Patents

Abstract

PURPOSE:To prolong the life of a sieve net and to improve sieving efficiency by installing a tensing device which absorbs the margin for thermal expansion of the sieve net by a high-temp. sieve-component material. CONSTITUTION:An energizing device using a spring 11 is used as the tensing device to absorb the margin for thermal expansion of the sieve net 2 consisting of the high-temp. sieve-component material. Namely, the tensing device is constituted of a spring 11, a cylinder 16, a bolt 12, a nut 13, and washers 14, 15. The sieve net 2 is set to a front end fixing plate 4 and a tensing plate 3 and the nut 13 fixed to the end of the bolt 12 connected to the tensing plate 3 is tightened via the washers 14, 15 in such a manner that about 500kgf load is applied on the vertical wires of the sieve net 2. As a result, the deformation of the sieve by the thermal expansion, etc., is prevented at the time of sieving a high temp. material and since the local secondary oscillation of the sieve net is prevented, the life of the sieve net is prolonged and the efficient sieving is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application J] The present invention relates to a vibrating sieve for sieving sieved substances such as high-temperature granules and agglomerates. More specifically, when sieving a sieved material heated to a high temperature, a method for preventing damage and a reduction in static rate caused by secondary vibration due to loosening of the sieve mesh caused by thermal expansion; Regarding the device.

[Prior Art] Conventional vibrating sieve meshes are made by bending both ends of a wire mesh into a hook shape, hooking the wire mesh onto hooks, or sandwiching the ends between plates, and then tensioning the hooks or plates on both sides. It was fixed. That is, as shown in FIG. 4, both sides of the sieve screen 42 are bent into a hook shape, and a hook 43 with one end bent into a hook shape is attached to this portion.
The wire mesh was fixed under tension by tightening the bolt 44, which is attached through the hook 43 and the sieve frame, with a nut 45.

[Problem to be Solved by the Invention 1] When such a sieve is used to sieve high-temperature sieved substances, the steel wires of the sieve screen thermally expand due to the high heat, causing loosening of the sieve screen, causing the sieve screen to become loose. The support attached to the bottom of the sieve and the contact area between the vertical and horizontal lines of the sieve may wear out, or irregular secondary vibrations may occur in the sieve mesh body, resulting in a decrease in static motion rate, and repeated stress and The steel wire of the sieve screen broke due to metal damage, so the sieve screen had to be replaced in a short period of time.

The present invention aims to solve such problems.

[Means for Solving the Problem 1] As a result of various studies aimed at solving the above problems and developing a sieve device with a long life of the sieve screen, the thermal expansion cost of the sieve screen due to high temperature sieving material was We have developed a vibrating sieving device for high-temperature substances, which is characterized by being equipped with a tension device that absorbs .

That is, the present invention provides a vibrating sieve with a sieve screen, in which the sieve of high-temperature substances is sometimes passed through the tension plate by connecting the horizontal or vertical lines of the screen to a tension plate so that the screen has a predetermined tension. This vibrating sieve for high-temperature substances is characterized by being equipped with a tensioning device that absorbs thermal expansion.

The tension device may be a vibration sieving device for high-temperature materials in which the tension device is a biasing device using a spring, or a vibration sieve device for high-temperature materials in which the tension device is a fluid pressure actuator. (1) The device for tensioning the horizontal or vertical lines of the sieve screen consists of a cylindrical cylinder whose closed end is in contact with the frame, a spring housed inside the cylinder, and an end of the spring. A washer that is in contact with the cylinder and is loosely fitted to the cylinder, a bolt that passes through the frame, the end of the cylinder, the Subunong and the washer, and whose end part is joined to the tension plate, and a bolt that passes through the washer on the top of the cylinder. and a nut screwed together.

(2) A device for tensioning the horizontal or vertical wires of the sieve screen is connected to a first shaft whose distal end is joined to the tensioning plate and whose upper end is connected to the end of a spring, and to the other end of this spring. death,
and a second shaft that passes through the frame or the fixing plate and is screwed together with a nut.

(3) The device for tensioning the horizontal lines or vertical lines of the sieve screen comprises a hydraulic or pneumatic cylinder whose lot end passes through a frame or a fixing plate and is joined to the tensioning plate, and the cylinder end is attached to the frame or fixing plate; A control device that controls the hydraulic pressure or air pressure in the cylinder to a predetermined pressure.

is suitable.

[Function] Normally, in order to prevent damage to the sieve due to abnormal secondary vibration, auxiliary supports are arranged to form an arch shape in the direction in which the steel wire of the sieve screen is stretched. . However, when high-temperature substances are sieved, heat is transmitted to the steel wires forming the sieve mesh, causing thermal expansion, destroying the arches and generating secondary vibrations.

Therefore, it is attempted to constantly apply the necessary tension to the muscles by using springs, air pressure, hydraulic pressure, or the like. Whether the tension is applied to the vertical lines or the horizontal lines of the sieve screen may be appropriately determined depending on the shape of the sieve, the weaving method of the sieve screen, etc.

As for the tension force to be applied, since the tensile strength varies depending on the type of steel wire constituting the sieve screen, the tension should be equal to or lower than the yield point at the temperature during use and during the cold period so that the length of the bow is one bow.

[Example 1 FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

Dimensions: 500X l, with an under-sieve outlet 6 at the tip of the bottom plate, and an above-sieve outlet 5 with a bottom on the lower surface of the tip fixing plate.
A 500 mm vibrating sieve 1 was equipped with tension devices shown below at two locations at the ends of the 500 mm vibrating sieve 1.

A fixing plate 4 for the tip of the sieve screen 2 was provided at a position 75 mm from the tip of the frame of the sieve 1. A tension plate 3 with an eaves protruding from a columnar rope is installed at a position approximately 255 mm from the end, and a tension plate 3 with an outer diameter of 50 mm and an inner diameter of 2 manufactured by Tokyo Hatsujo Seisakusho is attached to the bottom of the tension plate 3.
A cylinder 16 with an outer diameter of 50 and 5 mm, in which a spring 11 with a diameter of 5 mm and a free length of 200 mm was installed, was connected to the tip of a bolt 12 passing through the outer frame at the end. A tie-rod woven sieve screen 2 with a mesh opening of 3 mm shown in Table 1 with both ends bent into a hook shape was set on the tip fixing plate 4 and the tension plate 3. The nut 13 attached to the end of the bolt 12 connected to the tension plate 3 is fixed at a temperature of 5.
It was tightened through washers 14 and 15 so that a load of 00 kgf was applied.

600 pieces crushed to 5mm or less using the above vibrating sieve
The limestone agglomerates at ~550°C were sieved through a 3 mm mesh. Conventionally, the horizontal lines of the sieve screen were bent into a hook shape, one end of which was hooked onto a hook, and the bolts that passed through the hook and the sieve frame were tightened with nuts. However, the horizontal lines fixing the sieve broke after about 7 days. In this example, even after 60 days, the sieve is operating smoothly without any damage to the screen or wire breakage.

Table 1 and FIG. 2 show a second embodiment of the present invention. Second
The tensioning device shown in the figure has a first shaft 22 connected to the bottom of the tensioning plate 3 of a vibrating sieve having the same specifications as the one described above and passing through the sieve frame, and a first shaft 22 that fixes a spring 21 provided at the end of the first shaft 22. 1 fixing plate 24, a fixing frame 27 protruding from the end of the sieve frame, a bolt 23 passing through the fixing frame 27 and connecting the second fixing plate 25 to the end, and the first fixing plate 24. It is composed of a spring 21 connected to a second fixed plate 25 at both ends, and a cylindrical body 26 in which the spring 21 is installed and two fixed plates 24 and 25 are loosely fitted. This tensioning device was tightened with the nut 28 attached to the end of the bolt 23 in the same manner as described above so that the tension of the sieve wire during use was 500 kgf.

The effect is similar to that of the first embodiment, but in this case, minute secondary vibrations were generated over the entire surface of the sieve, which had the effect of preventing clogging of the sieve.

FIG. 3 shows a third embodiment of the present invention, in which a fixed frame 34 of a cylinder 32 is protruded from the end of a vibrating screen having the same specifications as the above, and a hydraulic cylinder 3 with a diameter of 100 mm is attached to the fixed frame 34.
2, and the piston rod 31 of the hydraulic cylinder 32.
The end of the sieve frame is passed through the sieve frame and connected to the tension plate 3. During use, the hydraulic pressure in the hydraulic cylinder 32 is adjusted to 8 kgf/cr so that the tension of the sieve wire is 500kgf.
n'' and is controlled via an automatic regulating valve and oil pressure setting provided in the hydraulic line.

[Effect of the invention J] As a result of using the vibrating sieve of the present invention, when sieving high-temperature substances, deformation of the sieve due to thermal expansion etc. can be prevented, and local secondary vibration of the n-mesh can be prevented. It is possible to extend the life of the filter and to sieve it efficiently. Therefore, repair costs can be reduced and the static/dynamic ratio can be improved. Furthermore, the simple structure facilitates maintenance and inspection, making it possible to save labor.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing a first embodiment of the present invention, Fig. 2 is a longitudinal sectional view showing a second embodiment of the invention, and Fig. 3 is a longitudinal sectional view showing a case where a hydraulic cylinder is used as a tensioning device. A vertical cross-sectional view showing an embodiment, and FIG. 4 is a cross-sectional view of a conventional vibrating sieve. l... Vibrating sieve 2... Sieve screen 3... Tension plate 4... Fixed plate 5... Discharge port 1
1... Spring 12... Bolt 13...
・Nut 14.15...Washer 21...Spring 23...Bolt 26...Cylinder 28...Nut 32...Cylinder 16...Cylinder 22...Shaft 24.25... Fixed plate 27...Fixed frame 31...Rod 34...Fixed frame application agent Mitsubishi Mining Cement Co., Ltd.

Claims (1)

[Scope of Claims] 1. A vibrating sieve for high-temperature substances, characterized in that it is equipped with a tensioning device that absorbs the thermal expansion of the sieve screen caused by the high-temperature sieved substances. 2. The vibrating sieve for high-temperature substances according to claim 1, wherein the tensioning device is a biasing device using a spring. 3. A vibrating sieve for high temperature materials according to claim 1, wherein the tensioning device is a hydraulic actuator.