JP7801705B2 - Grinding removal system and grinding removal method - Google Patents

Description

The present invention relates to a grinding and removal system and method suitable for grinding and removing, for example, asbestos-containing finishing coating materials.

Traditionally, architectural finish coatings containing asbestos have often been applied to the exterior walls of concrete structures, and this coating must be removed before the building is demolished. The Asbestos Hazard Prevention Regulations stipulate that when removing asbestos-containing finish coatings, the work area must be isolated, the grinding area must be covered, and the dust must be vacuumed or moistened while work is carried out, in order to prevent asbestos dust from leaking into the general environment.

For this reason, conventionally, as shown in Figure 5, a commercially available electric grinder 1 is fitted with a dust collection cover 2, and a vacuum cleaner 3 with a HEPA filter is attached to this dust collection cover 2, and the dust is sucked up while grinding and removing the dust using a dry method.

A similar conventional device is known, for example, as the concrete chipping dust collection device described in Patent Document 1. This device is configured to be attachable to heavy machinery and is equipped with a hammer for chipping the surface of concrete, a dust collection cover that is positioned to surround the hammer, and collection means that is connected to the dust collection cover and collects the chipped dust that has been sucked in.

JP 2013-019259 A

However, the above-mentioned conventional dry grinding method using an electric grinder had the following problems:

First, if the cutting surface is uneven during grinding, the cover cannot follow, which could cause dust to leak through the gap between the cover and the cutting surface and scatter (risk of dust dispersion). Second, if the vacuum cleaner filter attached to the cover becomes clogged within a short period of time (for example, within a few minutes of starting work), dust suction will be insufficient and dust will leak from the cover. Frequent replacement of the HEPA filter to prevent this will increase costs (reduced work efficiency and risk of dust dispersion). Third, it is difficult to apply the cover to the inside or outside corners of a building, increasing the risk of dust leakage (risk of dust dispersion). Fourth, if grinding is performed for long periods of time while under load, the electric grinder's motor may overheat and burn out (reduced work efficiency). For these reasons, there was a need for a technology that could solve these problems, providing excellent dust dispersion prevention and work efficiency.

The present invention was made in consideration of the above, and aims to provide a grinding and removal system and grinding and removal method that are excellent in preventing dust dispersion and work efficiency.

In order to solve the above-mentioned problems and achieve the objectives, the grinding and removal system of the present invention is a grinding and removal system that grinds an object and removes dust generated during the grinding and removal process, and is characterized by comprising a grinding means that grinds the object, and a foam supplying means that supplies foam to the object to moisten it.

Another grinding and removal system according to the present invention is characterized in that, in the above-mentioned invention, it further comprises a covering means that surrounds the grinding means to prevent leakage of the dust.

Another abrasive removal system according to the present invention is characterized in that, in the above-described invention, it further comprises a foam recovery means for recovering used foam from the object, and a recycling means for supplying the foam recovered by the foam recovery means to the foam supply means for reuse.

The grinding and removal method of the present invention is a method for grinding an object and removing dust generated during the grinding process, and is characterized by comprising the steps of placing a grinding means adjacent to the object, supplying foam to the object to moisten it, and, after moistening the object with the foam, grinding the object with the grinding means.

Another grinding and removal method according to the present invention is the same as the above-mentioned invention, but further comprising the step of providing a covering means in a position surrounding the grinding means to prevent leakage of the dust, and supplying foam to the object inside the covering means to moisten the object.

Another abrasive removal method according to the present invention is characterized in that, in the above-described invention, it further includes the steps of recovering used foam from the object and reusing the recovered foam as foam for wetting the object.

The grinding and removal system of the present invention grinds an object and removes the dust generated during the process. It is equipped with a grinding means for grinding the object and a foam supplying means for supplying foam to the object to moisten it, thereby achieving the effect of providing a grinding and removal system that is excellent in preventing dust dispersion and work efficiency.

Furthermore, another grinding and removal system according to the present invention further includes a covering means that surrounds the grinding means to prevent leakage of the dust, thereby achieving even better dust prevention and work efficiency.

In addition, another abrasive removal system according to the present invention further comprises a foam recovery means for recovering used foam from the object, and a recycling means for supplying the foam recovered by the foam recovery means to the foam supply means for reuse. Therefore, by recycling used foam, it is possible to reduce the cost of foam materials.

In addition, the grinding and removal method of the present invention is a method for grinding an object and removing dust generated during the grinding process, and includes the steps of placing a grinding means in close proximity to the object, supplying foam to the object to moisten it, and grinding the object with the grinding means after moistening it with the foam. This effectively provides a grinding and removal method that is excellent in preventing dust dispersion and work efficiency.

In addition, another grinding and removal method according to the present invention further includes the step of providing a covering means surrounding the grinding means to prevent leakage of the dust, and by supplying foam to the object inside the covering means to moisten the object, it is possible to achieve even better dust dispersion prevention and work efficiency.

In addition, another polishing and removal method according to the present invention further includes the steps of recovering used foam from the object and reusing the recovered foam as foam for wetting the object. By reusing used foam, it is possible to reduce the cost of foam materials.

FIG. 1 is a block diagram showing an embodiment of a grinding and removal system and a grinding and removal method according to the present invention. FIG. 2 is a vertical cross-sectional view showing an embodiment of a grinding device of a grinding and removing system according to the present invention. FIG. 3 is a front view showing an embodiment of the grinding device of the grinding and removing system according to the present invention. FIG. 4 is a cross-sectional view showing an embodiment of the grinding device of the grinding and removing system according to the present invention. FIG. 5 is a photograph showing an example of a conventional commercially available grinder with a cover attached, where (1) is a photograph taken from one oblique angle, and (2) is a photograph taken from the other oblique angle.

Below, an embodiment of the grinding and removal system and grinding and removal method according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to this embodiment.

As shown in Figure 1, the grinding and removal system 10 according to an embodiment of the present invention grinds an asbestos-containing finishing coating material 14 (target object) applied to the surface of a concrete exterior wall 12 and removes the dust generated during the process. This grinding and removal system 10 includes a grinder 16 that grinds the asbestos-containing finishing coating material 14 at grinding position P, a cover 18 that surrounds the grinder 16 to prevent dust leakage, a foaming device 20, a foam supplying device 22, a recovery device 24, and a recycling device 26.

The grinder 16 is the grinding means and is composed of a lightweight air-driven air grinder that uses an air compressor. The use of an air grinder reduces the weight of the device, does not place a load on the grinder 16 even during continuous operation, and eliminates the risk of electric shock even if it becomes wet. Note that the grinding means of the present invention is not limited to air grinders, and other types of grinders, such as electrically driven grinders, can also be used.

As shown in Figures 2 to 4, the grinder 16 comprises a main body case 28, a drive unit 30 housed within the main body case 28, and a rotary grindstone 32 connected to the drive unit 30. A hose 34 extending from an air compressor (not shown) is connected to the end of the main body case 28. Compressed air can be supplied to an air intake port (not shown) of the main body case 28 via this hose 34.

The drive unit 30 has an air motor and a power transmission mechanism (not shown), and transmits the rotational driving force of the air motor directly or indirectly to the rotary grinding wheel 32 via the power transmission mechanism. The air motor of the drive unit 30 can be configured, for example, to have a rotor with multiple blades rotatably mounted inside a cylinder fixed to the main body case 28, and to rotate the rotor by introducing compressed air through an air inlet provided in the cylinder. In addition to the air inlet, the cylinder may also be provided with an exhaust hole for discharging exhaust air to the outside. The rotary grinding wheel 32 is a circular disk-shaped grinding wheel rotatably attached to the output shaft 36 of the drive unit 30. The surface of the object can be ground by rotating the rotary grinding wheel 32 in close proximity to the object.

The cover 18 is a covering means comprising a disk-shaped base portion 38 fixed to the main body case 28 so as to cover the back side of the grinding wheel 32 of the grinder 16, and a sponge portion 40 consisting of a cylindrical sponge arranged along the outer periphery of the base portion 38.

Only a foam supply port 42 is provided on the base portion 38. The amount of foam required during grinding removal varies depending on the state of deterioration of the exterior wall 12 and the type of finish coating material 14. Therefore, it is necessary to change the amount of foam supplied during grinding work, so only a foam supply port 42 is provided on the cover 18. A hose 44 extending from the foam supply device 22 is connected to the supply port 42. The amount of foam supplied to the grinding position P can be adjusted by adjusting the gap between the sponge portion 40 of the cover 18 and the surface of the exterior wall 12. Any amount of foam can be supplied by changing the gap between the sponge portion 40 and the exterior wall 12. Even if a gap is opened during grinding work, dust will not scatter; only dust wrapped in foam will flow out.

U-shaped handles 46 for handholding are attached to three locations on the back side of the base portion 38 of the cover 18: on both the left and right sides and on the top. Connections between the base portion 38 and the main case 28, and between the base portion 38 and the sponge portion 40, etc., are secured using fixing members 48 such as bolts.

As shown in Figure 1, the foaming device 20 generates foam to moisten the grinding position P. This foaming device 20 can generate foam by adding a certain amount of foaming agent (e.g., a surfactant) and a scattering prevention agent to a liquid such as water. It is also possible to foam a foaming agent diluted with water to a volume of, for example, 30 to 50 times its original volume.

As shown in Figure 1, the foam supply device 22 is a foam supply means for supplying foam generated by the foaming device 20 to the grinding position P inside the cover 18, and can be composed of, for example, a pump and hose. As shown in Figure 2, a hose 44 extending from the foam supply device 22 is connected to the supply port 42 of the cover 18. Because the grinding method using the grinder 16 is a dry cutting method, any malfunctions or insufficient suction around the cover 18 directly lead to the risk of dust leakage. Therefore, if the foam supply device 22 supplies foam at a predetermined pressure through the hose 44 into the cover 18, and the foam is used to moisten the grinding position P before grinding is performed, the risk of dust leakage can be significantly reduced.

The recovery device 24 is a foam recovery means for recovering used foam, and can be composed, for example, of a suction device that sucks up used foam discharged to the outside of the cover 18, a hose that guides the foam sucked by the suction device to a recovery container, and a recovery container that stores the used foam guided by the hose.

The recycling device 26 is a recycling means for reusing the used foam recovered by the recovery device 24. For example, it can be composed of a separation means for separating the used foam into a chemical containing a foaming agent and the finishing coating material 14, and a supply means for supplying the separated chemical containing the foaming agent to the foaming device 20. The foam after grinding returns to its original foaming agent after recovery, so by filtering the liquid with a separation means such as a filter cloth, only the finishing coating material 14 can be separated and removed, and the filtered foaming agent can be reused. The separated finishing coating material 14 is disposed of after undergoing the required post-processing.

The operation and function of the above configuration will now be described.
First, the cover 18 and handle 46 are attached to the grinder 16. Next, the handle 46 is held in the hand, and the grinder 16 is placed close to the asbestos-containing finish coating material 14 on the surface of the concrete exterior wall 12, as shown in Figure 1. Meanwhile, foam is generated by the foaming device 20, and the foam is placed in a state where it can be supplied to the inside of the cover 18 by the foam supply device 22.

Next, the grinding wheel 32 of the grinder 16 is pressed against the grinding position P, and the foam supply device 22 supplies foam to the grinding position P inside the cover 18 to moisten it, after which the grinding wheel 32 is rotated. This allows the dust coming out of the grinding position P to be wrapped in the foam during grinding. The amount of foam supplied is adjusted by the size of the gap between the sponge portion 40 of the cover 18 and the surface of the outer wall 12. This size can be adjusted by the force with which the handle 46 is pressed against the outer wall 12 and the angle of pressure.

The ground foam that leaks from the gap between the cover 18 and the surface of the exterior wall 12 is collected by the collection device 24 and sent to the recycling device 26. The recycling device 26 supplies the foaming agent separated from the ground foam to the foaming device 20 for reuse. By recycling used foam, the cost of foam materials can be reduced. The topcoat material 14 separated from the ground foam is disposed of.

According to this embodiment, even if the grinding surface is uneven during grinding, the dust simply flows out wrapped in foam, eliminating the risk of it being dispersed into the environment. Furthermore, by using an air compressor, the grinder 16 can be operated continuously while the foaming device 20 produces foam, allowing workers to set their own working hours, resulting in more efficient work. Furthermore, there is no need to replace expensive HEPA filters as with conventional devices, which leads to reduced costs.

Therefore, this embodiment can provide a grinding and removal system that is excellent in preventing dust dispersion and work efficiency.

In the above embodiment, the grinding of asbestos-containing finishing coating materials was used as an example, but the present invention is not limited to this and can also be applied to work to remove coatings containing harmful substances such as lead and chromium, achieving the same effects as those described above.

While the above embodiment has been described using the cover 18 as an example, the present invention is not limited to this and can also be applied to grinding inside or outside corners where work cannot be done with the cover 18 attached. For example, foam from the foam supply device 22 can be applied directly to the grinding position, and grinding work can be performed using a grinding tool such as a chisel. Since grinding is performed in foam, dust does not spread. It is preferable to use a small pneumatic chisel connected to an air compressor, which uses compressed air to power a needle-shaped needle that moves back and forth against the grinding area, thereby performing the removal work. In this way, even in narrow areas around inside or outside corners, grinding work can be prevented from spreading by performing the grinding work in the supplied foam.

As described above, the grinding and removal system of the present invention grinds an object and removes the dust generated during the process. It is equipped with a grinding means for grinding the object and a foam supplying means for supplying foam to the object to moisten it, thereby providing an grinding and removal system with excellent dust dispersion prevention and work efficiency.

Furthermore, another grinding and removal system according to the present invention further includes a covering means that surrounds the grinding means to prevent leakage of the dust, thereby further improving dust dispersion prevention and work efficiency.

In addition, another abrasive removal system according to the present invention further includes a foam recovery means for recovering used foam from the object, and a recycling means for supplying the foam recovered by the foam recovery means to the foam supply means for reuse. By recycling used foam, the cost of foam materials can be reduced.

In addition, the grinding and removal method of the present invention grinds an object and removes the dust generated during the grinding process. It includes the steps of placing a grinding means in close proximity to the object, supplying foam to the object to moisten it, and, after moistening the object with the foam, grinding the object with the grinding means. This provides a grinding and removal method that is excellent in preventing dust dispersion and work efficiency.

In addition, another grinding and removal method according to the present invention further includes the step of providing a covering means in a position surrounding the grinding means to prevent leakage of the dust, and by supplying foam to the object inside the covering means to moisten the object, it is possible to further improve dust dispersion prevention and work efficiency.

In addition, another grinding and removal method according to the present invention further includes the steps of recovering used foam from the object and reusing the recovered foam as foam for wetting the object. By reusing used foam, the cost of foam materials can be reduced.

As described above, the grinding and removal system and grinding and removal method of the present invention are useful for grinding and removing asbestos-containing finishing coatings and other materials during building demolition work, and are particularly suitable for preventing dust dispersion and improving work efficiency.

10. Grinding and removal system 12. Exterior wall 14. Asbestos-containing finishing coating material (object)
16 Grinder (grinding means)
18 Cover (covering means)
20 Foaming device 22 Foam supplying device (foam supplying means)
24 Recovery device (foam recovery means)
26 Reuse device (reuse means)
28 Main body case 30 Drive unit 32 Rotary grinding wheel 34, 44 Hose 36 Output shaft 38 Base unit 40 Sponge unit 42 Supply port 46 Handle 48 Fixing member P Grinding position

Claims (4)

A grinding and removal system that grinds an object and removes the dust generated during the grinding and removal process.
A grinding and removal system comprising: a grinding means for grinding the object; a foam supplying means for supplying foam to the object to moisten the object; and a covering means provided around the grinding means to prevent leakage of the dust , wherein a handle is attached to the covering means . The grinding and removal system according to claim 1, further comprising a foam recovery means for recovering used foam from the object, and a recycling means for supplying the foam recovered by the foam recovery means to the foam supply means for reuse. A grinding and removal method for grinding an object and removing dust generated during the grinding and removal,
A grinding and removal method comprising the steps of: providing a covering means with a handle attached in a position surrounding the grinding means to prevent leakage of the dust; holding the handle and placing the grinding means close to the object; supplying foam to the object inside the covering means to wet the object; and grinding the object with the grinding means after wetting the object with the foam. 4. The method of claim 3 , further comprising the steps of: recovering used foam from the object; and reusing the recovered foam as foam for wetting the object.