JPH10309528A - Tension device for rubber screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a device easily to tense a rubber screen and moreover, capable of using the rubber screen with arbitrary thickness without narrowing the width thereof. SOLUTION: In a tension device for a rubber screen in which a locking iron plate 2 with a key-shaped cross section which is long along the lower surface of the side edge of a rubber screen 1 is fixed so that a key part 2a thereof is faced upward outside the side edge of the rubber screen 1 and the key part 2a is hooked so as to draw the screen closer to right and left screen frames 6, plural T-bolts 13 are arranged along the locking iron plate 2 of the rubber screen 1 at prescribed intervals, the hook parts 15b formed at one end of boltheads 15 of the T bolts 13 are hooked to the key part 2a of the locking iron plate 2, supporting parts 15c at the other end of the boltheads 15 are brought into contact with the inner surface of the screen frames 6, the tips of axis parts 14 are inserted into the screen frames 6 and nuts 10 are tied to the tips of the axis parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for tensioning a rubber screen in a vibrating sieve used for screening crushed rock, gravel, coal, coke and the like.

[0002]

2. Description of the Related Art FIG. 3 shows a known apparatus for tensioning a rubber screen in a vibrating sieve. In FIG. 3, a rubber screen 1 is formed by providing a large number of holes 1a in a rectangular plate made of abrasion-resistant rubber, and has a plurality of support bars extending in the width direction in the longitudinal direction (perpendicular to the paper surface) (illustrated in FIG. Is not supported on cushion rubber. On both side edges of the rubber screen 1, a locking iron plate 2 having a long L-shaped cross section is contacted along its lower surface, and a long contact plate 3 is contacted along its upper surface. A plurality of countersunk bolts 4 are inserted from below at a predetermined interval so as to protrude into counterbore holes 3a provided in the abutment plate 3, and the nut 5 is inserted through a washer 5a. The locking iron plate 2 and the contact plate 3 are fixed to the rubber screen 1 by this.

The locking iron plate 2 is mounted on a support frame 7 fixed to the inner surface of the screen frame 6 with the L-shaped key portion 2a of the locking iron plate 2 facing upward. Then, the lower end hook 8a of a long clamping bar 8 made of a channel steel or a ball angle steel is hooked on the key portion 2a, and a plurality of bolts 9 are arranged at predetermined intervals over the clamping bar 8 and the screen frame 6. When the nut 10 is inserted from the inside outwardly and fastened to the tip thereof via a washer 10a, the clamping bar 8 rotates clockwise about the upper end contacting the inner surface of the screen frame 6, and the lower end hook 8a Pulls the locking iron plate 2 toward the screen frame 6 side and tensions the rubber screen 1.

[0004]

However, the above-described rubber screen tensioning device uses a long clamping bar 8 parallel to the longitudinal direction of the rubber screen 1, into which the headed bolt 9 is inserted from the inside. Therefore, depending on the thickness of the rubber screen 1, the contact plate 3 on the rubber screen 1 is located right beside the head 9 a of the bolt 9, and the head 9 a of the bolt 9 interferes with the corner of the contact plate 3 or the rubber screen 1. As a result, it becomes difficult to insert the bolt 9, so it is necessary to investigate the mounting position and pitch of the bolt 9 in advance, and to cut out the corresponding portion of the bolt 9 on the contact plate 3 or the rubber screen 1. There was a problem that a sieving material such as quarry was caught between the head 9a of the bolt 9 and the corner of the plate 3 or the rubber screen.

When the gap between the bolt head 9a and the abutment plate 3 or the rubber screen 1 is widened in order to prevent the interference and the sieving raw material from being caught, the rubber screen 1
When the nut 5 is superimposed directly on the rubber screen 1 via the washer 5a, the sieving material such as the quarry hits the tip of the bolt 4 and the nut 5, There have been problems such as loosening of the nut 5 and breakage of the bolt 4 and the nut 5. Furthermore, since the sieving material such as the quarry directly hits the clamping bar 8, there is a problem that noise is intense and the clamping bar 8 wears quickly.

A first problem of the present invention is that when the rubber screen is tightened by attaching the clamping bar, the head of the fixing bolt of the clamping bar may interfere with the rubber screen itself or the abutment plate thereon. The present invention is to provide a rubber screen tensioning device that can easily tension the rubber screen, can use an arbitrary thickness as the rubber screen, and does not need to reduce the width. Further, a second problem is that a bolt tip and a nut protruding above the rubber screen and the tensioning device can be protected and their wear can be prevented, and moreover, a side that does not hinder the tensioning operation of the rubber screen. The provision of an edge cover.

[0007]

According to the first aspect of the present invention,
In order to solve the above first problem, a locking iron plate having a key-shaped cross section is fixed along a lower surface of a side edge of a rubber screen so that a key portion thereof faces upward outside a side edge of the rubber screen. In the tensioning device for a rubber screen, wherein the key portion is hooked and drawn to the left and right screen frames, a plurality of T-bolts are arranged at predetermined intervals along a locking iron plate of the rubber screen, and the T-shape is provided. A hook formed at one end of the bolt head of the bolt is hooked on a key of the locking iron plate, and a support formed at the other end of the bolt head is brought into contact with the inner surface of the screen frame. It is characterized in that it is inserted into the screen frame and a nut is fastened to the tip of the shaft portion.

The bolt head of the T-bolt has any shape as long as one end can be engaged with a locking iron plate fixed to a rubber screen and the other end can contact the inner surface of the screen frame. For example, the cross-sectional shape of the clamping bar 8 made of the conventional ball angle steel or channel steel (see FIG. 3) can be made equal to the cross-sectional shape. In this case, the above-mentioned channel steel or ball angle steel is cut short. Can be a bolt head. Then, a bolt having such a bolt head is
The bolts are arranged at predetermined intervals, and the hook at one end of the bolt head is engaged with the key of the locking iron plate, and the shaft is inserted into the bolt hole of the screen frame with the support at the other end facing upward. When a nut is fitted to the end of the shaft portion and fastened, the bolt head moves to the screen frame side, and then when the support end at the upper end of the bolt head contacts the inner surface of the screen frame, the bolt head connects the support end. Rotating around the fulcrum, the hook of the bolt head further pulls the locking iron plate toward the screen frame side, and tensions the rubber screen.

According to the present invention, the bolt head also serves as a conventional clamping bar, is integral with the bolt shaft, and has no projection corresponding to the conventional bolt head. It does not interfere with the contact plate etc. on the side edge of, and there is no trouble such as difficulty in inserting the bolt due to the interference, and a part of the rubber screen etc. is cut out in advance to avoid interference, It is not necessary to reduce the width of the rubber screen, but rather it is possible to make it wider than before, and the bolt head of the present invention has the same length as the conventional clamping bar as described above, The above insertion work is further facilitated because it is very short and light as compared with the conventional clamping bar.

The invention described in claim 2 solves the second problem together with the first problem, and in the invention described in claim 1 above, along the upper surface of the side edge of the rubber screen. And a metal substrate that extends from the inside in the width direction to above the plate and beyond the head of the T-bolt to the inner surface of the screen frame, and a rubber covering the upper surface of the substrate. A side edge cover comprising a layer is detachably attached.

According to the second aspect of the present invention, since the abutment plate on the side edge of the rubber screen and the T-bolt for tensioning the rubber screen are covered with the side edge cover, the quarry and other sieving raw materials can be used as described above. It does not hit the plate or the T-bolt and damage them. Since the upper surface of the side edge cover is covered with the rubber layer, noise when the sieving material collides with the side edge cover is reduced. Moreover, since the side edge cover is formed to be detachable from the plate, the rubber screen is tensioned in a state where the side edge cover is removed, and the side edge cover can be mounted after the rubber screen is completely mounted. The side edge cover does not hinder the operation of attaching the rubber screen.

[0012]

1 and 2, a long locking iron plate 2 is fixed along a lower surface of a side edge portion of a rubber screen 1 with a key portion 2a facing upward as in the prior art. This plate 11 fixed to the upper surface of the side edge of the rubber screen 1
Is a thin band-shaped plate as compared with the conventional one, and a plurality of headed pins 12 are erected on the upper surface thereof at predetermined intervals, and between the head 12a of this headed pin 12 and the plate 11. A gap of several millimeters is formed. The locking iron plate 2, the rubber screen 1, and the abutment plate 11 are connected to the locking iron plate 2
A plurality of countersunk bolts 4 are inserted at predetermined intervals upward from below, and nuts 5 are fitted to the ends of the bolts via washers 5a and fastened to each other by fastening.

The rubber screen 1 is mounted on the lower supporting frame 7 fixed to the side screen frame 6 via the locking iron plate 2. Then, the key portions 2a of the locking iron plate 2 are fixed in tension by T-bolts 13 arranged one by one at predetermined intervals along the locking iron plate 2.
The T-shaped bolt 13 has a substantially T-shape including a shaft portion 14 and a bolt head 15 fixed to the base portion by welding.
The above-mentioned bolt head 15 corresponds to a short cut of the clamping bar 8 made of the ball angle steel shown in FIG.
A vertical portion 15a perpendicular to the shaft portion 14, a hook portion 15b curved from the lower end toward the screen frame 6 side, and a support portion 15c extending horizontally from the upper end toward the screen frame 6 side are provided.

Therefore, the hook portion 15b is connected to the locking iron plate 2
When the nut 10 is fastened by fitting the shaft portion 14 through the bolt hole of the screen frame 6 and fitting the washer 10a and the nut 10 to the tip in this order, the bolt head 1
5 advances to the screen frame 6 side, the hook portion 15b at the lower end draws the rubber screen 1 through the locking iron plate 2, and when the tip of the support portion 15c contacts the inner surface of the screen frame 6, the bolt head 15 is supported. The tip of the portion 15c is rotated clockwise about the fulcrum, and the hook portion 15b at the lower end tensions the rubber screen 1 in the width direction. The T-bolt 13
A reinforcing ring 16 is fixed to the base of the shaft portion 14 by welding in a hub shape.

Reference numeral 20 denotes a contact plate 1 on the rubber screen 1.
1 is a side edge cover that is detachably fixed to 1. The side edge cover 20 includes an oblique steel plate substrate 21 extending from the inner side in the width direction of the abutment plate 11 and above the abutment plate 11 and the head 15 of the T-bolt 13 toward the inner surface of the screen frame 6.
And a rubber layer 22 covering the upper surface of the
It is formed long in one direction. Then, the substrate 21
A plurality of feet 23 are fixed along the lower edge outer surface by welding at the same pitch as the headed pins 12 on the abutment plate 11.

The foot 23 has a fork 23a at its lower end which extends outward in the width direction along the surface of the abutment plate 11. The fork 23a has an upper surface inclined such that its thickness is reduced at its tip. It is formed so that it can be pressed into the gap between the head 12a of the headed pin 12 and the plate 11, and at this time, the shaft of the headed pin 12 is sandwiched between two fingers constituting the fork 23a. . Therefore, after the rubber screen 1 is tensioned by the fastening of the T-bolt 13, the side edge cover 20 is moved to the foot portion 2 of the side edge cover 20.
The fork 23a is placed on the contact plate 11 and pressed into the gap between the contact plate 11 and the head 12a of the headed pin 12, thereby being fixed on the contact plate 11 and pulled out in the opposite direction. Is done.

In the above structure, the shaft 1 of the T-bolt 13
4 are integrally fixed to the bolt head 15 and do not protrude from the bolt head 15 toward the abutment plate 11 on the rubber screen 1 and the bolt head 15 is made of rubber like the clamping bar 8 of FIG. Locking iron plate 2 on the lower surface of screen 1
Has a function of hooking it to the screen frame 6 side, so that there is no protrusion on the surface of the bolt head 15 on the side of the abutment plate 11. Therefore, when the T-bolt 13 is attached, the thickness of the rubber screen 1 is large. The head 15 of the T-bolt 13 does not interfere with the head 11 of the rubber plate 1, the corner of the rubber screen 1 or the nut 5 on the head 11 even if it is small. It is much shorter and lighter than the clamping bar 8, and its mounting work is easy.

Then, since the side edge cover 20 covering the above-mentioned contact plate 11 and the T-shaped bolt 13 is fixed to the contact plate 11, the contact plate 11, the T-shaped bolt 13, the tip of the bolt 4 on the contact plate 11, The nut 5 and the head 12a of the headed pin 12 and the like are protected from quarrying and the like, and the side edge cover 20 has a rubber layer 22 on its surface, so that noise due to quarry colliding with the side edge cover 20 is reduced. Further, since the side edge cover 20 can be attached and detached by press-fitting the lower end foot 23 from the inside in the width direction of the abutment plate 11 and pulling it out, there is no hindrance to the tension work of the rubber screen 1 by the T-bolts 13. .

[0019]

As described above, according to the first aspect of the present invention, the rubber screen can be easily tensioned as compared with the conventional one, and any rubber screen having any thickness can be used. There is no need to reduce the width. According to the second aspect of the invention, a bolt tip or a nut projecting on the rubber screen or laterally,
The locking iron plate under the rubber screen, the tensioning device, and the like can be protected and its wear can be prevented, and the tensioning operation of the rubber screen is not hindered.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a longitudinal sectional view of a conventional device.

[Explanation of symbols]

 1: Rubber screen 2: Locking iron plate 2a: Lock part 4: Bolt 5: Nut 6: Screen frame 7: Support frame 10: Nut 10a: Washer 11: This plate 12: Headed pin 12a: Head 13: T-bolt 14: Shaft 15: Bolt head 15a: Vertical 15b: Hook 15c: Support 16: Reinforcement ring 20: Side edge cover 21: Substrate 22: Rubber layer 23: Foot 23a: Fork

Claims (2)

[Claims] 1. A locking iron plate having a long key-shaped cross section is fixed along a lower surface of a side edge of a rubber screen so that a key portion thereof faces upward outside a side edge of the rubber screen, and the key portion is hooked. In a tensioning device for a rubber screen which is drawn to the left and right screen frames, a plurality of T-bolts are arranged at predetermined intervals along a locking iron plate of the rubber screen, and one end of a bolt head of the T-bolt is provided at one end. The formed hook portion is hooked on the key portion of the locking iron plate, the support portion formed at the other end of the bolt head is brought into contact with the inner surface of the screen frame, and the tip of the shaft portion of the T-bolt is inserted into the screen frame. A tensioning device for a rubber screen, wherein a nut is fastened to a tip of a shaft portion. 2. A long metal plate is fixed along the upper surface of the side edge of the rubber screen, and a metal is attached to the metal plate from the inner side in the width direction to the upper side of the metal plate and beyond the head of the T-bolt to the inner surface of the screen frame. 2. The rubber screen tensioning device according to claim 1, wherein a side edge cover comprising a substrate made of a resin and a rubber layer covering an upper surface of the substrate is detachably attached.