JP7330536B2 - Vacuum device for wet drilling device and wet drilling device provided with the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vacuum device for a wet-type drilling device that performs drilling while supplying cooling liquid to a drilling object such as concrete, tiles, stone, etc., and a wet-type drilling device having the same.

A suction pump is required to remove the coolant in wet drilling equipment that drills into concrete structures. For example, Patent Literature 1 describes a wet-type drilling device that includes a suction pump that sucks coolant or the like supplied to a drilled portion, and a recovery tank that stores the coolant or the like sucked by the suction pump. . A general-purpose industrial vacuum pump is generally used as the suction pump used in the wet drilling apparatus.

Japanese Patent Application Laid-Open No. 2011-37210

A general-purpose vacuum pump for industrial use is installed at a position lower than the height of the perforated part. This is because, if a general-purpose vacuum pump is installed at a position higher than the height of the perforated portion and sucks, the coolant or the like cannot be sucked up and flows backward to the perforated portion. In addition, general-purpose vacuum pumps for industrial use have too high a motor output, so power is wasted but suction force is small.

Therefore, in the present invention, there is provided a wet-type drilling apparatus capable of recovering a discharge containing a cooling liquid generated during drilling with a large suction force using a pump having a smaller output than an industrial general-purpose vacuum pump. An object of the present invention is to provide a vacuum device and a wet drilling device having the same.

A vacuum device of the present invention is a vacuum device for a wet-type drilling device that performs drilling while supplying cooling liquid to an object to be drilled. and a recovery tank, and a diaphragm pump for sucking the discharge into the recovery tank through the hose by sucking the air in the recovery tank to maintain a reduced pressure state.

According to the vacuum device of the present invention, the air in the collection tank is sucked by the diaphragm pump to maintain the reduced pressure state, and the pressure difference between the inside of the collection tank and the perforated portion of the object to be perforated causes the discharged material to flow through the hose to the perforated portion. can be sucked into the recovery tank from the

Here, the diaphragm pump maintains the inside of the recovery tank at −0.03 MPa (gauge pressure, the same shall apply hereinafter) or less, more preferably −0.04 MPa or less, further preferably −0.05 MPa or less. desirable. By maintaining the inside of the collection tank at −0.03 MPa or less, it becomes possible to suck the discharged matter into the collection tank even if the collection tank is installed at a position higher than the perforated portion of the object to be perforated.

It is desirable that the vacuum device of the present invention has an elastic body that adheres closely to the object to be drilled and covers the drilled portion. As a result, it is possible to prevent the inflow of outside air into the perforated portion and reduce the pressure inside the elastic body to forcefully suck the discharged matter from the perforated portion.

The vacuum device of the present invention preferably has a dust filter on the exhaust side of the diaphragm pump. In the wet drilling equipment, the cooling liquid is mixed with dust (grinding powder) of the drilling object such as concrete, tiles and stones, and is sucked into the recovery tank. can be removed by

The vacuum device of the present invention preferably has a dust filter on the suction side of the diaphragm pump. As a result, it is possible to prevent the dust or the like that has not dissolved in the cooling liquid from entering the diaphragm pump as described above.

A wet piercing apparatus of the present invention is a wet piercing apparatus that performs piercing while supplying cooling liquid to an object to be pierced, and includes the vacuum device of the present invention. According to the wet-type perforating apparatus of the present invention, the air in the collection tank is sucked by the diaphragm pump to maintain a reduced pressure state, and the discharge material is perforated through the hose due to the pressure difference between the inside of the collection tank and the perforated portion of the object to be perforated. part can be sucked into the collection tank.

(1) A recovery tank for recovering the discharge containing the cooling liquid, a hose connected to the perforated portion of the object to be punched and the recovery tank, and a hose that sucks the air in the recovery tank and maintains it in a decompressed state. and a diaphragm pump for sucking the discharge into the recovery tank through a vacuum device to collect the discharge containing the cooling liquid generated during drilling with a larger suction force and a smaller output than an industrial general-purpose vacuum pump. is possible, and power saving and low noise can be realized.

(2) By maintaining the inside of the recovery tank at -0.03 MPa or less, it becomes possible to suck the discharged matter into the recovery tank even if the recovery tank is installed at a position higher than the perforated portion of the object to be perforated. , workability is improved.

(3) The structure having the elastic body that covers the perforated part in close contact with the object to be perforated prevents the inflow of outside air into the perforated part, reduces the pressure inside the elastic body, and vigorously sucks the excrement from the perforated part. Therefore, the size of the diaphragm pump can be reduced, and further power saving can be achieved.

(4) The structure having a dust filter on the exhaust side of the diaphragm pump can remove dust that has not dissolved in the cooling liquid by the dust filter, thereby reducing the environmental load.

(5) The diaphragm pump has a dust-proof filter on the suction side of the diaphragm pump.

1 is a schematic configuration diagram of a vacuum device according to an embodiment of the present invention; FIG. FIG. 2 is an overall configuration diagram of a wet drilling device equipped with the vacuum device of FIG. 1; FIG. 3 is an enlarged view of the main body of the vacuum device in FIG. 2; FIG. 3 is an exploded perspective view of a filter portion of the vacuum device main body of FIG. 2; 3 is an enlarged view of the drill part of FIG. 2; FIG. 3 is an enlarged cross-sectional view of the tip of the drill portion of FIG. 2; FIG. It is a figure which shows the example which installed the recovery tank in the position higher than a perforation part.

FIG. 1 is a schematic configuration diagram of a vacuum device according to an embodiment of the present invention.

As shown in FIG. 1, the vacuum device 1 according to the embodiment of the present invention includes a recovery tank 10 for recovering a discharge containing a cooling liquid such as water, and a drilling portion of a drilling object C0 such as concrete, tiles, or stone. It has a hose 11 connected to the C1 and the collection tank 10, and a diaphragm pump 12 for sucking the air in the collection tank 10. The hose 11 is a pressure-resistant hose. The diaphragm pump 12 is connected to an upper space 10A inside the recovery tank 10 via a tube 10B.

The diaphragm pump 12 draws in the air in the collection tank 10 and maintains it in a decompressed state, thereby sucking the discharge into the collection tank 10 through the hose 11 . The diaphragm pump 12 used has a suction capacity capable of maintaining the pressure in the recovery tank 10 at -0.03 MPa to -0.07 MPa. The maximum output of the diaphragm pump 12 having a suction capacity within this range is about 26W.

It should be noted that the discharge sucked by the vacuum device 1 in the present embodiment is a slurry-like discharge containing cooling liquid that is generated when drilling an object to be drilled such as concrete, tiles, stone, etc. while supplying the cooling liquid. However, since the diaphragm pump 12 is connected to the upper space 10A in the recovery tank 10, the slurry discharge is not sucked by the diaphragm pump 12. .

A dust filter 13 is provided on the exhaust side of the diaphragm pump 12 . The dust generated by drilling dissolves in the cooling liquid and becomes slurry, so it hardly scatters, but if the cooling liquid runs out during drilling, the dust will pass through the diaphragm pump 12 and be exhausted. . Therefore, by providing the dust-proof filter 13 on the exhaust side of the diaphragm pump 12, it is possible to remove dust that has not dissolved in the cooling liquid from the exhaust air and then release the dust into the atmosphere.

Furthermore, although not shown, it is possible to adopt a configuration in which the diaphragm pump 12 and the dust filter 13 are arranged in reverse, or a configuration in which a dust filter similar to the dust filter 13 is provided on the suction side of the diaphragm pump 12. be. As a result, it is possible to prevent dust or the like that has not been dissolved in the cooling liquid from entering the diaphragm pump 12 as described above, and it is possible to prevent failure of the diaphragm pump 12 .

The vacuum device 1 also has an elastic body 14 such as rubber that is in close contact with the drilling object C0 and covers the drilling portion C1. The elastic body 14 is provided at the tip portion of the wet drill 2 .

2 is an overall configuration diagram of a wet drilling device equipped with the vacuum device of FIG. 1, FIG. 3 is an enlarged view of the main body of the vacuum device of FIG. 2, and FIG. 4 is an exploded perspective view of the filter portion of the main body of the vacuum device of FIG. 5 is an enlarged view of the drill part of FIG. 2, and FIG. 6 is an enlarged sectional view of the tip of the drill part of FIG.

As shown in FIG. 2, the wet drilling apparatus according to the embodiment of the present invention includes the aforementioned vacuum device 1, a wet drill 2, and a pumping pump device (not shown) for pumping coolant, air, etc. to the wet drill 2. ). The wet drill 2 performs drilling by rotating the drill bit 20 while supplying cooling liquid, air, or the like pressure-fed by a pressure-feeding pump device to the drilling object C0. As the wet drill 2, for example, the one disclosed in JP-A-2019-72919 can be used. As shown in FIG. 6 , a supply path 21 is formed in the drill bit 20 to supply a coolant or the like to the tip of the drill bit 20 . A slit-shaped discharge port 22 communicating with a supply passage 21 is formed at the tip of the drill bit 20 .

As shown in FIGS. 5 and 6, the elastic body 14 is in close contact with a mounting portion 14A fitted to the tip portion of the wet drill 2 and the side surface of the rotating drill bit 20, and supplied to the tip of the drill bit 20. A drill bit seal portion 14B that prevents leakage of the cooling liquid, etc., and a drilling portion seal that seals the drilled portion C1 in close contact with the drilling object C0 to prevent leakage of the cooling liquid and the inflow of outside air (air leakage). and a portion 14C. A side surface of the drill bit seal portion 14B is provided with a suction port 14D for sucking the discharge including the cooling liquid and the like. The hose 11 is connected to the suction port 14D.

As shown in FIG. 3, the vacuum device 1 has a diaphragm pump 12 mounted on a recovery tank 10 . As shown in FIG. 4, a filter chamber 12A is provided on the exhaust side of the diaphragm pump 12. As shown in FIG. The dust filter 13 is replaceably mounted in the filter chamber 12A and fixed to the diaphragm pump 12 by a filter fixing plate 12B and an exhaust plate 12C. The dustproof filter 13 is composed of activated carbon and a HEPA filter (JIS Z 8122).

In the vacuum device 1 configured as described above, when performing drilling by rotating the drill bit 20 while supplying cooling liquid, air, etc. to the drilling object C0 by the wet drill 2, first, the tip of the wet drill 2 is equipped with The elastic body 14 is pressed against the perforated portion C1 of the object to be perforated C0, and the diaphragm pump 12 is driven to reduce the pressure in the recovery tank 10 to -0.03 MPa or less. In this state, when drilling is performed by rotating the drill bit 20 while cooling liquid or the like is being supplied to the tip of the drill bit 20, the discharge containing the cooling liquid or the like generated by the drilling is discharged into the recovery tank 10 and the drilled portion C1. is sucked into the collection tank 10 through the hose 11 from the suction port 14D due to the pressure difference between the two.

During the drilling operation, the air in the recovery tank 10 is continuously sucked by the diaphragm pump 12, so that the inside of the recovery tank 10 can be maintained in a decompressed state of -0.03 MPa or less. It is possible to collect the discharged matter containing , with a smaller output than an industrial general-purpose vacuum pump with a large suction force, and power saving can be realized. Moreover, since the vacuum device 1 has a large suction force, as shown in FIG. ), the discharge can be sucked into the recovery tank 10.

In particular, since the diaphragm pump 12 also has a low motor noise, it is possible to work quietly compared to industrial general-purpose vacuum pumps. In addition, the vacuum device 1 according to the present embodiment includes an elastic body 14 such as rubber that is in close contact with the drilling object C0 and covers the drilled portion C1, and seals the drilled portion C1 to prevent leakage of coolant and air. Therefore, the suction capacity of the diaphragm pump 12 can be minimized. Therefore, the diaphragm pump 12 can be downsized, and further power saving can be realized.

In the wet drilling apparatus, the cooling liquid is mixed with the dust (grinding powder) of the drilling object C0 such as concrete, tiles, and stones, and is sucked into the recovery tank 10. The contaminants and the like are sent to a filter chamber 12A provided on the exhaust side of the diaphragm pump 12, and after being sequentially removed by the activated carbon of the dust filter 13 and the HEPA filter, are discharged from the exhaust port 12D. Therefore, the exhaust discharged from the exhaust port 12D is clean and can reduce the environmental load.

A suction test was conducted using the vacuum device 1 in the above embodiment to verify the best pressure to be set in the recovery tank 10 .

In the test, a diaphragm pump 12 with an output of 19 W (maximum output of 26 W) and a suction capacity of -0.07 MPa was used. The capacity of the recovery tank 10 is 10L. As the hose 11, a pressure-resistant hose (outer diameter φ8 mm, inner diameter φ5.5 mm, length 3.5 m) was used.

The test procedure was as follows.
(1) A diaphragm pump 12 and a recovery tank 10 were installed at a position 3 m above the floor, and a hose 11 was hung downward.
(2) A water bucket filled with tap water was placed on the floor.
(3) After the diaphragm pump 12 was operated and the internal pressure of the recovery tank 10 reached a set value, the tip of the hose 11 was put into a water bucket to suck tap water.
(4) Time was measured from the start of suction until the tap water reached the collection tank 10 located 3 m above.

Table 1 shows the verification results.

From the above verification results, it was found that the pressure in the recovery tank 10 is preferably maintained at −0.03 MPa or less, more preferably −0.04 MPa or less, and even more preferably −0.05 MPa or less. . By maintaining the inside of the recovery tank 10 at −0.03 MPa or less, it is possible to suck the discharge into the recovery tank 10 even if the recovery tank 10 is installed at a position higher than the height of the drilling target C0. is.

INDUSTRIAL APPLICABILITY The present invention is useful as a vacuum device for a wet drilling device that drills holes while supplying cooling liquid to an object to be drilled such as concrete, tiles and stones, and a wet drilling device including the same.

1 Vacuum Device 2 Wet Drill 10 Collection Tank 11 Hose 12 Diaphragm Pump 12A Filter Chamber 12B Filter Fixing Plate 12C Exhaust Plate 12D Exhaust Port 13 Antidust Filter 14 Elastic Body 14A Mounting Portion 14B Drill Bit Seal Portion 14C Drilling Portion Seal Portion 14D Suction Port 20 drill bit

Claims (4)

A vacuum device for a wet-type drilling device that performs drilling while supplying cooling liquid to a drilling object,
a recovery tank for recovering the effluent containing the cooling liquid;
a hose connected to the perforated portion of the perforated object and the upper space in the recovery tank;
a diaphragm pump that is connected to the upper space in the recovery tank and sucks the air in the recovery tank to maintain a reduced pressure state, thereby directly sucking the discharge into the recovery tank through the hose;
a dust filter including a HEPA filter provided on either or both of the exhaust side and the intake side of the diaphragm pump;
A vacuum device with 2. The vacuum device according to claim 1, wherein the diaphragm pump maintains the inside of the recovery tank at -0.03 MPa (gauge pressure) or less. 3. The vacuum device according to claim 1, further comprising an elastic body that adheres closely to the object to be drilled and covers the drilled portion. A wet-type drilling device that performs drilling while supplying cooling liquid to a drilling object,
A wet drilling device comprising the vacuum device according to any one of claims 1 to 3 .

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