Dust hood for toothed circular saw in rock wool production line

Abstract

The utility model relates to a dust hood for a toothed circular saw of a rock wool production line. The utility model mainly aims to solve the problems of the existing dust hood that the gap between the dust hood and the rock wool board is large, the pollution is serious, and the height of the dust hood needs to be adjusted manually, which is inconvenient. The utility model mainly consists of a large hood (1) that is approximately semicircular, a dust suction pipe joint (2), and a fan-shaped small hood (3). The small hood (3) can be rotated up and down in the large hood (1) through a hinge (4). During production, the bottom (31) of the small hood (3) falls on the rock wool board (36). The small hood (3) connects the rock wool board with the large hood (1) (similar to the dust hood of the existing technology), blocks the space for sawdust to splash outward, reduces the leakage of sawdust, and alleviates the pollution of sawdust to the environment. The small hood (3) is pressed on the upper plane of the rock wool board (36) by gravity, and the height automatically fluctuates with the thickness of the rock wool board without manual adjustment. It is more convenient to use than the dust hood of the existing technology.

Description

Technical Field

[0001] The utility model relates to a dust suction cover, in particular to a dust suction cover for a toothed circular saw used in a rock wool production line. Background Art

[0002] Rock wool products use basalt, dolomite and other materials as the main raw materials. After being melted at a high temperature of more than 1500℃, they are centrifuged into fibers by a four-axis centrifuge at high speed. At the same time, a certain amount of binder, dust-proof oil, water-repellent, etc. are sprayed in, and then collected by a cotton collector, spread by a pendulum process, and then cured and cut to form rock wool products of different specifications and uses. The equipment used in cutting includes trimmers, longitudinal cutters and crosscutters. Toothed circular saws are widely used in these devices. The existing toothed circular saw dust cover used in these devices is a flat shell with an opening at the bottom that is approximately semicircular. A pipe joint connected to the dust collection pipe is arranged above this shell.

[0003] In order to avoid the danger of the dust hood being hit by the rock wool board during production, the bottom edge of the dust hood must be higher than the plane of the rock wool board. The thickness of the rock wool board is not fixed. It needs to be changed according to the user's requirements to produce rock wool boards of different thickness specifications. The height of the dust hood in the prior art cannot be automatically adjusted following the change of this thickness. In order to avoid the danger of being hit by the rock wool board and to cope with various thickness conditions, the bottom edge of the dust hood is generally raised higher, which brings a problem. Since the bottom edge of the dust hood is much higher than the rock wool board, a large gap will be left between the bottom edge of the dust hood and the plane of the rock wool board. Part of the sawdust brought out by the high-speed rotating toothed circular saw will splash out from this gap and cannot be sucked away by the dust suction pipe. Over time, it will cause serious pollution to the surrounding environment.

[0004] In order to reduce this pollution, some users have also done work to reduce this gap. They made the dust hood an adjustable structure or added a baffle that can be adjusted up and down. However, their height is not automatically adjusted according to the thickness of the rock wool board. Due to the danger of high-speed rotating circular saws or the limitations of the working space, the height of the dust hood cannot or is not convenient to adjust during production. It can only be adjusted when the machine is stopped and fixed after adjustment. This has great limitations and inconveniences. In order to cope with the changes in the thickness of the rock wool board during production and avoid the danger of the dust hood being collided with the rock wool board, the bottom edge of the dust hood is still lifted higher, so that there is still a large gap between the bottom edge of the dust hood and the rock wool board. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a dust hood, which can automatically follow the thickness change of the rock wool board during the production process, greatly reducing the gap between the bottom edge of the dust hood and the rock wool board, thereby effectively reducing the pollution to the environment. At the same time, the height of the dust hood does not need to be adjusted manually, which improves the convenience of use.

[0006] In order to solve the above technical problems, the dust suction hood of the utility model includes a large hood of a flat shell with a roughly semicircular lower opening, and a pipe joint for connecting a dust suction pipe is provided on the upper side of the large hood. The large hood is fixed on the circular saw shaft seat, which is not drawn here. A small hood of a flat shell with upper and lower openings that is approximately fan-shaped is connected to the large hood through a hinge, and the axis of the hinge on the small hood is located at the center of the circle or near the center of the fan-shaped shell of the small hood, and the axis of the hinge on the large hood shell is located near the opening of the circular saw shaft. The small hood can rotate up and down in the large hood, and the tail side of the small hood with the toothed groove group is close to the tail side of the large hood. In order to prevent the small hood from falling out of the large hood, a limiting mechanism for the small hood to fall to the bottom is provided.

[0007] As a preferred structure of the utility model, the hinge is composed of a through hole on the large cover, a through hole for a bearing embedded in the through hole on the small cover, and a shaft with a spring retaining ring.

[0008] As another preferred structure of the utility model, the limiting mechanism is composed of an inward-facing U-shaped folded edge of the large cover and an outward-facing folded edge on the upper portion of the small cover. The use of this folded edge structure not only increases the structural strength of the large cover and the small cover, but also realizes the limiting function.

[0009] As a further improvement of the utility model, the limiting mechanism is embedded with an elastic strip in the groove formed by the inward U-shaped folded edge at the lower part of the large cover. The elastic strip is higher than the groove formed by the U-shaped folded edge. When the small cover falls, it can be cushioned on the elastic strip.

[0010] As a preferred structure of the utility model, an outward-turned U-shaped folded edge is provided at the lower part of the small cover. The use of this folded edge structure can not only increase the structural strength of the small cover, but also widen the width of the working surface between the small cover and the rock wool board.

[0011] As a further improvement of the utility model, a wear-resistant strip is arranged at the bottom of the outward-turned U-shaped folded edge at the lower part of the small cover, so that the dust collection cover is more durable.

[0012] As a further improvement of the utility model, a pulley is arranged at the tail of the small cover to make the dust collection cover more durable.

[0013] As a further improvement of the utility model, a one-way locking mechanism is provided which enables the small cover to rotate upward but not downward.

[0014] As a preferred structure of the utility model, the one-way locking mechanism is composed of a sawtooth groove group, a torsion spring, a rotating shaft, a locking trigger, and a machine base.

[0015] As a further improvement of the utility model, the one-way locking mechanism is equipped with a cylinder, which can be remotely operated, which is safer and more convenient than direct manual operation.

[0016] To explain, the circular saw always rotates in one direction. On the upper plane of the rock wool board, only the position where the circular saw rotates out will bring out sawdust. The dust hood is to collect the sawdust splashed out from this place. The tail of the dust hood faces this position. The tail of the utility model refers to the side with the small hood. The circular saw rotates upward on this side. The tail end of the small hood is the side away from the hinge. For the trimmer and the longitudinal cutter, the rock wool board moves toward the circular saw, and for the cross-cutting machine, the circular saw moves toward the rock wool board.

[0017] Before starting production, when preparing to start production, the small hood falls to the bottom, and the bottom of the tail end of the small hood is lower than the upper plane of the thinnest rock wool board. After starting production, the relative rock wool board moves toward the circular saw. After the circular saw cuts through the head of the rock wool board, the edge of the head of the rock wool board begins to press against the front edge of the small hood, and the small hood begins to rotate backward. As the small hood rotates, the bottom of the small hood is continuously raised until the edge of the head of the rock wool board passes over the small hood, and the bottom of the small hood falls on the rock wool board. At this time, the small hood shell connects the sawdust outlet of the rock wool board with the large hood. Driven by the whirlwind brought by the high-speed rotating circular saw and pulled by the suction of the dust suction pipe at the pipe joint, the sawdust brought out by the circular saw is removed due to the centrifugal force of the high-speed rotating circular saw. The sawdust will move along the rear inner space of the small hood, the rear inner space of the large hood, and the top inner space of the large hood, and finally enter the pipe joint and be sucked away by the dust suction pipe. Due to the centrifugal force of the high-speed rotating circular saw, the sawdust goes through the bottom channel of the above-mentioned inner space groove, and this bottom channel is continuous, unlike the dust hood in the prior art (similar to the large hood in the utility model), which has no connection with the small hood, and there is a gap between the dust hood and the rock wool board, and this bottom channel is open and discontinuous, so it is inevitable that the dust hood of the utility model will leak less sawdust than the dust hood of the prior art, that is to say, the dust hood of the utility model will pollute the surrounding environment less than the dust hood of the prior art, that is to say, it will be more environmentally friendly. Furthermore, since the bottom of the small hood falls directly on the rock wool board and can automatically rise and fall with the thickness of the rock wool board, and the small hood is lower than the upper plane of the thinnest rock wool board when it falls to the bottom, the small hood can adapt to both thin and thick plates, and there is no need to manually adjust the height of the dust hood, unlike the dust hood of the prior art, which still needs to be manually adjusted in the parking state for safety. Therefore, the dust hood of the utility model is more convenient to use than the dust hood of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0019] Figure 1 It is a three-dimensional view of the dust hood of the utility model.

[0020] Figure 2 It is a partially exploded three-dimensional view of the large cover of the dust hood of the utility model.

[0021] Figure 3 It is a partially exploded three-dimensional view of the small cover of the dust hood of the utility model.

[0022] Figure 4 It is a side view of the trigger of the one-way locking mechanism of the dust hood of the utility model.

[0023] Figure 5 This is a schematic diagram of the working state of the dust collection hood of the utility model before cutting.

[0024] Figure 6 This is a schematic diagram of the working state of the dust hood of the utility model during cutting.

[0025] Figure 7 The figure is a schematic diagram of the working state of the dust hood in cutting in the prior art. DETAILED DESCRIPTION

[0026] The dust suction hood of the utility model comprises a large hood 1 of a flat shell with a roughly semicircular lower opening, a pipe joint 2 for connecting a dust suction pipe is provided on the upper side of the large hood 1, the large hood 1 is fixed on a circular saw shaft seat, the circular saw shaft seat is not drawn here, and a small hood 3 of a flat shell with upper and lower openings approximately in the shape of a fan is connected to the large hood 1 through a hinge 4, the axis of the hinge 4 on the small hood 3 is located at the center of the circle or near the center of the fan-shaped shell of the small hood 3, the axis of the hinge 4 on the shell of the large hood 1 is located near the opening 5 of the circular saw shaft, the small hood 3 can rotate up and down in the large hood 1, the tail side of the small hood 3 with the toothed groove group 7 is close to the tail side of the large hood 1, in order to prevent the small hood 3 from falling out of the large hood 1, a limiting mechanism 6 for the small hood 3 to fall to the bottom is provided, when the small hood 3 falls to the bottom during production, the bottom position 31 of the small hood 3 at the bottom is lower than the upper plane of the thinnest rock wool board.

[0027] As a preferred structure of the utility model, the hinge 4 is composed of the through holes 10, 11 of the large cover 1, the through hole 26 of the bearing embedded in the through hole of the small cover 3, and the shafts 12, 13 with spring retaining rings. Of course, the hinge can also have other structures. For example, another structure is that the hinge 4 is composed of the through holes 10, 11 of the large cover 1, the through hole 26 of the small cover 3, and the shafts 12, 13 with spring retaining rings. Compared with the preferred structure, the bearing embedded in the through hole of the small cover 3 is removed; for example, another structure is that the hinge 4 is composed of the through holes 10, 11 of the large cover 1, the through hole 26 of the small cover 3, and the pins 12, 13 with holes; for example, another structure is that the hinge 4 is composed of the screw holes 10, 11 of the large cover 1, the through hole 26 of the small cover 3, and the screws 12, 13.

[0028] As another preferred structure of the utility model, the limiting mechanism 6 when the small cover 3 drops to the bottom is composed of the inner U-shaped folded edges 14, 15 of the large cover 1 and the outer folded edges 24, 25 of the upper part of the small cover 3. When the outer folded edges 24, 25 of the upper part of the small cover 3 fall on the inner U-shaped folded edges 14, 15 of the large cover 1, the small cover 3 falls to the bottom and stops falling. The use of this folded edge structure not only increases the structural strength of the large cover 1 and the small cover 3, but also realizes the limiting function. Of course, replacing the folded edges 14, 15 of the large cover 1 or the folded edges 24, 25 of the small cover 3 with other obstacles such as cylinders can also realize this positioning function, which is also within the protection scope of this patent.

[0029] As a further improvement of the utility model, the limiting mechanism 6 is embedded with elastic strips 16, 17 in the groove formed by the inward buckled U-shaped folded edges 14, 15 at the lower part of the large cover 1. The elastic strips 16, 17 are higher than the grooves formed by the U-shaped folded edges 14, 15. When the small cover 3 falls down, it can be cushioned on the elastic strips 16, 17.

[0030] As a preferred structure of the utility model, outward-turned U-shaped folded edges 28 and 29 are provided at the lower part of the small cover 3. These two folded edges can not only increase the structural strength of the small cover 3, but also widen the width of the action surface between the front edge 38 of the small cover 3 and the rock wool board 36, so that the rock wool board 36 can more easily push the small cover 3 to rotate.

[0031] As a further improvement of the utility model, wear-resistant strips 29, 30 are arranged at the bottom of the U-shaped folded edges 27, 28 at the lower part of the small cover 3. The wear-resistant strips 29, 30 can be replaced after being worn without damaging the small cover 3, thereby making the dust cover more durable.

[0032] As a further improvement of the utility model, a pulley 9 is arranged at the tail of the small cover 3, and the lower surface of the pulley 9 is lower than the bottom 31 of the small cover 3. When the small cover 3 is pressed on the rock wool board 36, the pulley 9 supports the small cover 3. Since the pulley 9 and the rock wool board 36 are in rolling friction, and the bottom 31 of the small cover 3 and the rock wool board 36 are in sliding friction, the service life of the small cover 3 will be longer after adding the pulley 9. At the same time, the pulley 9 can be replaced after being worn without damaging the small cover 3, thereby making the dust hood more durable.

[0033] As a further improvement of the present invention, a one-way locking mechanism 8 is provided to enable the small cover to rotate upward but not downward.

[0034] As a preferred structure of the utility model, the one-way locking mechanism 8 is composed of a sawtooth groove group 7, a torsion spring 18, a rotating shaft 19, a locking trigger 20, and a machine base assembly 22, 23.

[0035] As a further improvement of the present invention, the one-way locking mechanism 8 is provided with a cylinder 21, which can be remotely operated, and is safer and more convenient than direct manual operation.

[0036] like Figure 4 As shown, before starting production, when preparing to start production, the small cover 3 falls to the lower limit position, that is, falls to the bottom, and the bottom 31 of the tail end of the small cover 3 is lower than the upper plane of the thinnest rock wool board, as shown in FIG. Figure 5 As shown, after the cutting starts, the relative rock wool board 36 moves toward the circular saw 37. After passing the circular saw 37, the head edge of the rock wool board 36 starts to press against the front edge 38 of the small cover 3, and the small cover 3 starts to rotate backward. As the small cover 3 rotates, the bottom 31 of the small cover 3 is continuously raised until the head edge of the rock wool board 36 passes over the small cover 3, and the bottom 31 of the small cover 3 falls on the upper plane of the rock wool board 36. At this time, the shell of the small cover 3 connects the sawdust outlet of the rock wool board 36 with the large cover 1. Under the push of the whirlwind brought by the high-speed rotating circular saw 37 and the pull of the suction of the dust suction pipe at the pipe joint 2, Due to the centrifugal force of the high-speed rotating circular saw 37, the sawdust brought out by the circular saw 37 will move along the tail inner space of the small cover 3, the tail inner space of the large cover 1, and the top inner space of the large cover 1, and finally enter the pipe joint 2 to be sucked away by the dust suction pipe. Due to the centrifugal force of the high-speed rotating circular saw 37, the sawdust will go through the bottom channel of the above-mentioned inner space groove, and this bottom channel is coherent, unlike the dust suction hood in the prior art (similar to the large cover 1 in the utility model) which has no connection with the small cover 3, and there is a gap between the dust suction hood and the rock wool board. This bottom channel is open and discontinuous, such as Figure 7As shown, the dust hood of the utility model will inevitably leak less sawdust than the dust hood of the prior art, that is to say, the dust hood of the utility model is less polluting to the surrounding environment than the dust hood of the prior art, and is more environmentally friendly. In addition, since the bottom 31 of the small cover 3 falls directly on the rock wool board 36 and can automatically rise and fall with the thickness of the rock wool board 36, and the small cover 3 is lower than the upper plane of the thinnest rock wool board when it falls to the bottom, the small cover 3 can adapt to both thin and thick plates, and there is no need to manually adjust the height of the dust hood, unlike the dust hood of the prior art, which still needs to be manually adjusted, and for safety, it needs to be adjusted in the parking state, so the dust hood of the utility model is more convenient to use than the dust hood of the prior art.

[0037] As a further improvement of the utility model, a detailed description of the implementation of the one-way locking mechanism 8 is provided. The locking trigger 20 is connected to the machine base 22, 23 by a rotating shaft 19 passing through the hole 35. The torsion spring 18 twists the locking trigger 20 inward, and the locking tongue 34 of the locking trigger 20 is pressed into the tooth groove of the serrated groove group 7 at the tail of the small cover 3 through the corresponding hole at the tail of the large cover 1. Similar to the working principle of the one-way rotation of the ratchet, when the small cover 3 is rotated upward, the lower inclined surface of the tooth groove of the serrated groove group 7 can push the lower inclined surface of the locking tongue 34, so that the locking tongue 34 rotates outward until it is disengaged. When the small cover 3 is rotated downward, the upper plane of the tooth groove of the sawtooth groove group 7 is supported by the upper plane of the lock tongue 34, and the lock tongue 34 does not have the component of force to rotate outwards, and the lock tongue can not rotate outwards, and the upper plane of the tooth groove of the sawtooth groove group 7 of the small cover 3 afterbody is supported by the upper plane of the lock tongue 34 always, and the small cover 3 cannot rotate downwards, so the function of utilizing the one-way locking mechanism 8 to make the small cover 3 only rotate upwards and not rotate downwards is realized. When the small cover 3 needs to fall, that is, when rotating downwards, the manual lever 32 of the locking trigger 20 can be manually pulled outwards, and thereupon the lock tongue 34 rotates outwards, and breaks away from the support to the tooth groove of the sawtooth groove group 7, and the small cover 3 can fall down by gravity. As a further improvement, the cylinder 21 can be used instead of human hands to perform this operation. When the small cover 3 needs to fall, it is only necessary to remotely turn on the switch of the cylinder 21 to push out the cylinder rod of the cylinder 21. When the cylinder rod is pushed out, the inclined surface at the top of the cylinder rod pushes the inclined surface 33 of the locking trigger 20, so that the locking trigger 20 rotates outward, and then the locking tongue 34 rotates outward and disengages from the support of the tooth grooves of the serrated groove group 7, and the small cover 3 can fall down by gravity. After the small cover 3 falls, the switch of the cylinder 21 is remotely disconnected to retract the cylinder rod, and the work of lowering the small cover 3 is completed. It is safer and more convenient to use the cylinder 21 instead of human hands to perform this operation.

[0038] The reason for adding the one-way locking mechanism 8 is that in normal production, the rock wool boards under the trimmer and longitudinal cutter on the rock wool production line are continuous, and the height of the dust cover 3 falling on the rock wool board is relatively stable, and there is no need to rise and fall frequently, and the life of the dust cover is not greatly affected. However, for the cross-cutting machine, it implements transverse cutting of the rock wool board. Each time it cuts, it crosses the rock wool board. Each time it crosses the rock wool board, the small cover 3 must go through the process of rising and falling. This lifting process is assisted by Figure 5 , Figure 6To illustrate, the circular saw 37 moves toward the rock wool board 36. After the circular saw 37 cuts through the edge of the rock wool board 36, the front edge 38 of the small cover 3 begins to push against the edge of the rock wool board 36. As the circular saw continues to move, the small cover 3 is pushed by the edge of the rock wool board 36 and begins to rotate. As the small cover 3 rotates, the bottom 31 of the small cover 3 is continuously raised until the bottom 31 of the small cover 3 falls on the rock wool board 36. When the circular saw 37 and the small cover 3 pass over the rock wool board 36, the small cover 3 loses the support of the rock wool board 36 and falls off the rock wool board 36. Then the circular saw stops moving forward and is lifted up with the dust cover, rising until the bottom 31 of the small cover 3 is higher than the upper plane of the rock wool board 36. Then the dust cover of the circular saw returns as a whole and is lowered. After passing over the rock wool board 36, it stops moving, and then the circular saw falls to the same cutting height as the previous time to prepare for the next cutting. This rising and falling process is performed once for each cut, and it is performed tens of thousands of times a day, and millions of times a year. This will have a great impact on the service life of the dust hood of the utility model. In order to reduce the impact of the frequent up and down of the small cover 3 on the life of the dust hood, a one-way locking mechanism 8 is provided to allow the small cover to rotate upward but not downward. It is based on the working principle that the thickness of the rock wool board is not frequently changed, and each change in thickness requires a period of production. Before the start of production, the small cover 3 is dropped. After the start of production, the circular saw 37 of the cross-cutting machine moves towards the rock wool board 36 moves, and after the circular saw 37 cuts through the edge of the rock wool board 36, the front edge 38 of the small cover 3 begins to push against the edge of the rock wool board 36. As the circular saw continues to move, the small cover 3 is pushed by the edge of the rock wool board 36 and begins to rotate. As the small cover 3 rotates, the bottom 31 of the small cover 3 is continuously raised until the bottom 31 of the small cover 3 falls on the rock wool board 36. When the circular saw 37 and the small cover 3 pass over the rock wool board 36, the small cover 3 loses the support of the rock wool board 36, but due to the one-way locking effect of the one-way locking mechanism 8, the small cover 3 will maintain its original height and will not fall down. Then the circular saw stops moving forward and is lifted up with the dust cover until the bottom 31 of the small cover 3 is higher than the upper plane of the rock wool board 36. Then the circular saw stops moving forward and is lifted up with the dust cover, until the bottom 31 of the small cover 3 is higher than the upper plane of the rock wool board 36. The saw dust hood returns as a whole and stops moving after crossing the rock wool board 36, and then the circular saw 37 falls to the same cutting height as the previous time to prepare for the next cutting. At this time, the height of the bottom 31 of the small hood 3 is consistent with the height of the upper plane of the rock wool board 36, so when starting cutting again, the small hood 3 does not need to be raised again. After the circular saw 37 cuts through the rock wool board 36, the small hood 3 will not fall due to the one-way locking effect of the one-way locking mechanism 8, and then stops, returns, and falls as the previous time, preparing for the next cutting, and repeats in sequence. Before changing the thickness of the rock wool board again, the small hood 3 does not need to rise and fall frequently, thereby avoiding the influence of the frequent rising and falling of the small hood 3 on the service life of the dust hood.The thickness of the rock wool board will always change during production. When it becomes a thicker board, the small cover 3 will automatically rise as the rock wool board becomes thicker, and you don't need to worry about it. When it becomes a thinner board, you need to remotely turn on the switch of the cylinder 21 to push the cylinder rod out, so that the small cover 3 falls down, and then disconnect the switch of the cylinder 21 to retract the cylinder rod. Just operate once, as mentioned above, when cutting, the bottom 31 of the small cover 3 will re-lock the new height on the upper plane of the rock wool board 36, and then the height of the small cover 3 will no longer change and cutting will continue until the next rock wool board becomes a thinner board.

Claims

1. A dust cover for a toothed circular saw of a rock wool production line, comprising a large flat shell cover (1) with a substantially semicircular shape and an opening at the bottom, a pipe joint (2) for connecting a dust suction pipe is provided on the upper side of the large cover (1), and the large cover (1) is fixed on a shaft seat of the circular saw, characterized in that: A small flat shell (3) with approximately fan-shaped upper and lower openings is connected to a large shell (1) through a hinge (4). The axis of the hinge (4) on the small shell (3) is located at or near the center of the circle of the fan-shaped shell of the small shell (3). The axis of the hinge (4) on the large shell (1) is located near the circular saw shaft opening (5) of the shell of the large shell (1). The small shell (3) can rotate up and down in the large shell (1). The tail side of the small shell (3) with the toothed groove group (7) is close to the tail side of the large shell (1). In order to prevent the small shell (3) from falling out of the large shell (1), a limiting mechanism (6) for the small shell to fall to the bottom is provided.

2. The dust cover for the toothed circular saw of the rock wool production line according to claim 1 is characterized by: The hinge (4) is composed of through holes (10, 11) of the large cover (1), a through hole (26) of a bearing embedded in the through hole of the small cover (3), and shafts (12, 13) with spring retaining rings.

3. The dust cover for the toothed circular saw of the rock wool production line according to claim 1 is characterized by: The limiting mechanism (6) is composed of inwardly buckled U-shaped folded edges (14, 15) at the lower part of the large cover (1) and outwardly turned folded edges (24, 25) at the upper part of the small cover (3).

4. The dust cover for the toothed circular saw of the rock wool production line according to claim 3 is characterized by: The limiting mechanism (6) is inlaid with elastic strips (16, 17) in the groove formed by the inwardly buckled U-shaped folded edges (14, 15) of the large cover (1), and the elastic strips (16, 17) are higher than the groove formed by the U-shaped folded edges (14, 15).

5. The dust cover for the toothed circular saw of the rock wool production line according to claim 1 is characterized by: The lower part of the small cover (3) is provided with outward-turned U-shaped folded edges (27, 28).

6. The dust cover for the toothed circular saw of the rock wool production line according to claim 5 is characterized by: Wear-resistant strips (29, 30) are arranged at the bottom of the outward-turned U-shaped folded edges (27, 28) at the lower part of the small cover (3).

7. The dust cover for the toothed circular saw of the rock wool production line according to claim 1 is characterized by: A pulley (9) is arranged at the tail of the small cover (3).

8. The dust cover for the toothed circular saw of the rock wool production line according to claim 1 is characterized by: A one-way locking mechanism (8) is provided which enables the small cover (3) to rotate upward but not downward.

9. The dust cover for the toothed circular saw of the rock wool production line according to claim 8 is characterized by: The one-way locking mechanism (8) is composed of a sawtooth groove group (7), a torsion spring (18), a rotating shaft (19), a locking trigger (20), and a machine base (22, 23).

10. The dust cover for the toothed circular saw of the rock wool production line according to claim 8, characterized in that: The one-way locking mechanism (8) is equipped with a cylinder (21).

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