JP7557866B2 - Liquid circulation system and drilling system equipped with same - Google Patents

Description

The present invention relates to a liquid circulation system and a drilling system equipped with the same.

Conventionally, some drilling devices used to drill holes in concrete, porcelain tiles, etc. supply liquid from the cutting edge of the bit to the drilled portion of the object to be drilled. An example of this type of prior art is a portable circulating filter device that has a liquid supplying device for supplying liquid to the cutting edge of the drilling device, and a separation device for separating dust from the object to be drilled from a suspension that is a mixture of the liquid supplied from the cutting edge and dust (chips) from the drilled portion (see, for example, Patent Document 1).

In the portable circulating filtration device of Patent Document 1, the suspension coming out of the perforated portion of the object to be perforated is led into a filter in the portable circulating filtration device via a suspension recovery section and a drainage pipe. In the portable circulating filtration device, the filter separates the dust from the object to be perforated from the suspension, and liquid is obtained to be supplied to the perforation device.

JP 2002-337136 A

In the portable circulating filtration device proposed in Patent Document 1, the suspension coming out of the perforated portion of the perforated body is led from the suspension recovery section to the separation device via a drain pipe. However, in this case, depending on the amount of suspension discharged, there is a risk that the suspension discharged into the drain pipe will flow back into the suspension recovery section.

Therefore, the present invention aims to provide a liquid circulation system and a drilling system equipped with the same that can circulate the suspension while appropriately suppressing backflow.

In order to achieve the above object, the liquid circulation system of the present invention comprises a shielding section that covers the portion of the object to be drilled with the cutting edge of a bit attached to a drilling device, a liquid container that stores liquid, a liquid supplying device that forcibly supplies the liquid stored in the liquid container to the cutting edge, and a liquid recovery device that forcibly recovers the suspension from the portion shielded by the shielding section and returns it to the liquid container. In this specification and claims, "suspension" refers to a liquid that is a mixture of the liquid supplied to the cutting edge and the object to be drilled with the cutting edge.

With this configuration, the drilling portion of the workpiece to be drilled with the cutting edge of the bit attached to the drilling device is covered with a shielding portion, liquid is forcibly supplied to the cutting edge from the liquid supply device, and the suspension is forcibly recovered from the portion shielded by the shielding portion by the liquid recovery device, so that backflow of the suspension can be appropriately suppressed.

The liquid supply device may have a first tube pump that forcibly supplies a portion of the liquid stored in the liquid container to the cutting edge, and the liquid recovery device may have a second tube pump that forcibly recovers the suspension from the portion shielded by the shielding part to the liquid container, and may have a switch that operates/stops the first tube pump and the second tube pump in conjunction with each other. With this configuration, the first tube pump can forcibly supply the liquid and the second tube pump can forcibly recover the suspension by the second tube pump in conjunction with each other using a switch, allowing the liquid to be circulated appropriately. Moreover, by using a tube pump to circulate the liquid, even suspension containing dust generated by perforation at the cutting edge can be properly sent.

A strainer may also be provided in the liquid recovery flow path between the shielding portion and the second tube pump. With this configuration, even in operations where there is a risk of large fragments being mixed into the dust produced by drilling with the cutting edge, the large fragments can be removed by the strainer.

The liquid recovery flow path between the shielding portion and the strainer may be formed to a thickness corresponding to the fragments of the object to be drilled that are discharged from the shielding portion. With this configuration, even in operations where there is a risk of large fragments being mixed into the dust generated by drilling with the cutting edge portion, the large fragments can be smoothly guided through the liquid recovery flow path from the shielding portion to the strainer and removed by the strainer.

The shielding portion may also have a sealing member around the perforation portion that comes into contact with the object to be perforated. This configuration can appropriately prevent the liquid forcibly supplied to the cutting edge by the liquid supply device from leaking between the shielding portion and the object to be perforated.

On the other hand, the drilling system according to the present invention includes any one of the liquid circulation systems described above, and the drilling device has a liquid supply mechanism that opens and closes the supply flow path of the liquid supplied by the liquid supply device, and a biasing mechanism that biases the shielding portion forward.

With this configuration, the liquid supply device of the liquid circulation system can forcibly supply liquid to the cutting edge, and the liquid recovery device can forcibly recover the suspension from the perforation portion and store it in the liquid container. The suspension in the liquid container can be circulated by the separation device as liquid to be supplied to the cutting edge of the perforation device. Moreover, with the shielding portion appropriately pressed toward the object to be perforated by the biasing mechanism, the liquid supply mechanism can open the liquid supply flow path to supply liquid to the cutting edge.

The liquid supply mechanism may also be configured to have a slide member that moves a predetermined amount toward the rear of the drilling device together with the bit, and the supply flow path is opened by the slide member moving the predetermined amount. With this configuration, when the bit is pressed against the object to be drilled in order to perform drilling work with the drilling device, the slide member moves a predetermined amount toward the rear of the drilling device together with the bit, opening the liquid supply flow path of the liquid supply mechanism, so that liquid can be supplied to the cutting edge of the bit in conjunction with the drilling work.

The cutting edge of the bit may be arranged with a predetermined amount of clearance from the front surface of the shielding part toward the liquid supply mechanism, and the predetermined amount by which the sliding member of the liquid supply mechanism moves may be set to be smaller than the clearance. With this configuration, after the shielding part is pressed against the body to be drilled in order to perform the drilling operation, the liquid supply flow path is opened, so that the liquid can be supplied while the shielding part is pressed against the body to be drilled with an appropriate force to perform the drilling operation.

The biasing mechanism may also have a guide section extending from the drilling device toward the shielding section, a slide section to whose front end the shielding section is fixed and which slides while being guided by the guide section, a biasing section which biases the slide section forward along the guide section, and a holding section which holds the slide section at a predetermined position. With this configuration, the shielding section fixed to the front end of the slide section is biased forward by the biasing section along the guide section extending from the drilling device toward the shielding section. Thus, drilling work can be performed with the bit while the shielding section is pressed against the object to be drilled.

The present invention makes it possible to provide a liquid circulation system and a drilling system equipped with the same that can circulate the suspension while appropriately suppressing backflow.

FIG. 1 is a schematic diagram showing the overall configuration of a first drilling system according to a first embodiment of the present invention. FIG. 2 is a plan view of the tube pump shown in FIG. FIG. 3 is a schematic cross-sectional view showing a liquid supply mechanism of the drilling device in the first drilling system shown in FIG. 4A and 4B are diagrams showing the shielding part of the first drilling system shown in FIG. 1, in which (a) is a schematic diagram seen from the direction of the drilling device, and (b) is a central longitudinal sectional view. FIG. 5 is a schematic plan view of a biasing mechanism that biases the shielding portion shown in FIG. 4 toward the object to be punched. 6A and 6B are diagrams showing the operation of the liquid supply mechanism shown in FIG. 3 during operation, where FIG. 6A is a schematic cross-sectional view before operation, and FIG. 6B is a schematic cross-sectional view during operation. FIG. 7 is a schematic diagram showing the overall configuration of a second drilling system according to a second embodiment of the present invention. FIG. 8 is an enlarged, partially cross-sectional view showing a strainer provided in the liquid recovery flow path of the second drilling system shown in FIG.

An embodiment of the present invention will be described below with reference to the drawings. In the following embodiment, a drilling system 1, 70 is described as an example in which a cutting edge 8 of a bit 7 attached to a drilling device 2 is used to form a hole of a predetermined depth in a body 100 (e.g., a concrete wall, a porcelain tile wall, etc.). Water L is also described as an example of a liquid. The drilling system 1, 70 is not limited to the following embodiment, and various configurations may be changed without departing from the gist of the present invention. Note that the concept of the front-rear direction in this specification and claims is the same as the concept of the front-rear direction in which the cutting edge 8 is the forward direction with respect to the drilling device 2 shown in FIG. 1.

(First drilling system according to the first embodiment)
1 is a schematic diagram showing the overall configuration of a first drilling system 1 according to the first embodiment. The first drilling system 1 according to this embodiment includes a drilling device 2 for performing drilling work, a shielding part 50 for covering a drilling portion 101 of a drilled object 100 to be drilled with a cutting edge part 8 of a bit 7 (cutting tool) attached to the drilling device 2, and a liquid circulation system 30 for circulating water L to be supplied to the cutting edge part 8 of the bit 7. The shielding part 50 is urged forward by a urging mechanism 20 provided in the drilling device 2.

The drilling device 2 comprises an electric drill 3, a liquid supply mechanism 10 attached to the electric drill 3, and a bit 7 attached to the liquid supply mechanism 10. The electric drill 3 comprises a drill body 4, an operating unit 5 for driving the drill body 4, and a gripping mechanism 6 provided at the tip of the drill body 4 for gripping the shank 12 of the liquid supply mechanism 10. The liquid supply mechanism 10 has a rotating unit 11 in the center that grips the base of the bit 7 and rotates, and is provided with a liquid supply unit 13 around it that serves as a supply unit for water L. Details of the liquid supply mechanism 10 will be described later.

The drilling device 2 rotates the gripping mechanism 6 by rotating a motor (not shown) provided in the drill body 4, and rotates the bit 7 via the rotating part 11 of the liquid supply mechanism 10. The cutting edge 8 of the rotating bit 7 is pressed against the object to be drilled 100 to perform the drilling operation. During this drilling operation, water L is supplied from the liquid supply mechanism 10 to the cutting edge 8 of the bit 7. Supplying water L between the cutting edge 8 and the object to be drilled 100 reduces friction between the cutting edge 8 and the object to be drilled 100 and suppresses heat generation during drilling.

(Liquid Circulation System)
FIG. 2 is a plan view of the tube pumps 32 and 36 shown in FIG. 1. As shown in FIGS. 1 and 2, the liquid circulation system 30 according to this embodiment includes a liquid supply device 31 that forcibly supplies water L from a liquid container 40 to the cutting edge 8 via the liquid supply mechanism 10 of the drilling device 2. The liquid circulation system 30 also includes a liquid recovery device 35 that forcibly recovers a suspension S in which dust C (including debris generated by drilling the object 100) that has been cut from the drilling portion 101 is mixed with water L from the shielding portion 50 to the liquid container 40. The liquid container 40 has an internal container 41 that can store, for example, about 4 to 5 liters of water L. The liquid supply device 31 according to this embodiment includes a first tube pump 32. The liquid recovery device 35 includes a second tube pump 36. The first tube pump 32 and the second tube pump 36 according to this embodiment are integrated into a double-tube pump. Inside the liquid container 40 , there is provided a separation device 45 for separating large dust particles C of the object to be drilled 100 from the suspension S recovered by the liquid recovery device 35 .

(Liquid supply device and liquid recovery device)
1 and 2, the double tube pump of this embodiment is configured such that the supply side for water L and the recovery side for suspension S are driven by the same drive shaft 39. A double tube pump of known structure can be used. Note that the first tube pump 32 and the second tube pump 36 may each be configured separately, or another known pump may be used.

The liquid supply device 31 has a first supply flow path 33 that uses a first tube pump 32 to suck up water L from a liquid container 40 for storing water L, and a second supply flow path 34 that supplies the water L from the first tube pump 32 to the liquid supply mechanism 10 of the drilling device 2. The upstream end of the first supply flow path 33 is connected to a separation device 45 in the liquid container 40.

The liquid recovery device 35 has a first liquid recovery flow path 37 that forcibly recovers the suspension S from the shielding portion 50 using a second tube pump 36, and a second liquid recovery flow path 38 that sends the suspension S from the second tube pump 36 to the liquid container 40.

The first tube pump 32 and the second tube pump 36 are configured so that a roller (not shown) rotated by a drive shaft 39 compresses the tube inside the tube pump, creating a vacuum state and drawing liquid into the tube. The first tube pump 32 and the second tube pump 36 can properly pump even suspension S containing dust C, since only the tube comes into contact with the liquid. The first tube pump 32 can be one that can supply, for example, about 100 to 150 milliliters of water L per minute to the liquid supply mechanism 10 of the drilling device 2.

(Separation device)
The separation device 45 according to this embodiment is floated on the water L stored in the inner container 41 in the liquid container 40. The separation device 45 has a float 46 that generates buoyancy at least near the liquid surface of the suspension S, and a strainer 47 that can move integrally with the float 46 in the suspension S and separates large dust C from the suspension S. The separation device 45 is attached to the upstream end of the first supply flow path 33. The separation device 45 sucks up the water L from the upper part of the water L in which the dust C and the like have settled due to their own weight from the suspension S stored in the liquid container 40, through the strainer 47, from which the large dust C (dust C of a size that cannot pass between the sliding member 17 and the rotating part 11 of the liquid supply mechanism 10, and between the inclined surface 17a and the seal member 15; for example, about 1 mm) has been removed.

The separation device 45 may be a filter (not shown) for separating dust particles C provided inside the inner container 41 of the liquid container 40. The separation device 45 does not need to be provided if large dust particles C are not mixed into the water L supplied from the liquid container 40 to the cutting edge portion 8 of the drilling device 2. The separation device 45 is not limited to these configurations.

(Liquid supply mechanism)
3 is a schematic cross-sectional view showing the liquid supply mechanism 10 of the drilling device 2 in the first drilling system 1 shown in FIG. 1. The liquid supply mechanism 10 of this embodiment has a rotating part 11 having a shank 12 that is gripped by the gripping mechanism 6 of the electric drill 3, and a liquid supply part 13 provided around the rotating part 11. The liquid supply part 13 can be kept in a non-rotating state by a bearing 14 provided between the liquid supply part 13 and the rotating part 11. A second supply flow path 34 is connected to the liquid supply part 13. A supply flow path 13a provided inside the liquid supply part 13 is connected to a supply flow path 11a provided in the rotating part 11.

A bit attachment portion 16 that grips the base of the bit 7 is provided at the front of the rotating portion 11. The base of the bit 7 is inserted and held in the bit attachment portion 16. The mechanism that holds the base of the bit 7 is not shown in the figure. The mechanism that holds the base of the bit 7 can use known technology.

Inside the rotating part 11, there is provided a slide member 17 that can move a predetermined amount in the forward and backward directions with the base of the bit 7 abutting against it. The slide member 17 is biased forward by a biasing member 18 (spring) provided inside the rotating part 11. A widening inclined surface 17a is provided at the rear of the slide member 17, and this inclined surface 17a abuts against a seal member 15 provided at a predetermined position of the rotating part 11 by the biasing force of the biasing member 18. The front of the slide member 17 is sealed by a seal member 19 provided between the slide member 17 and the bit mounting part 16. An O-ring can be used for the seal members 15 and 19. The slide member 17 can slide backward against the biasing force of the biasing member 18 within a predetermined amount of gap A between the slide member 17 and the rotating part 11.

The space 11b between the slide member 17 and the rotating part 11 is connected to the liquid supply hole 9 provided in the bit 7 via a supply flow passage 17b provided in the slide member 17. The liquid supply hole 9 is provided from the base of the bit 7 to the cutting edge 8.

As shown in the figure, when the slide member 17 is biased forward by the biasing member 18, the inclined surface 17a abuts against the seal member 15, and the space between the supply flow path 11a and the space 11b is closed. In this state, the water L supplied to the liquid supply unit 13 from the second supply flow path 34 does not flow from the supply flow path 11a to the space 11b.

On the other hand, when the slide member 17 is pressed from the direction of the bit 7 (the state shown in FIG. 6(b) described later), the slide member 17 moves backward within the range of a predetermined amount of gap A against the biasing force of the biasing member 18. In this state, the inclined surface 17a separates from the seal member 15, and the supply flow path 11a and the space 11b are in communication, and the water L supplied from the second supply flow path 34 flows from the supply flow path 11a to the space 11b.

Therefore, when the bit 7 is attached to the bit attachment portion 16, the water L is supplied only up to the liquid supply mechanism 10, and when the bit 7 is pushed backward, the water L supplied to the liquid supply mechanism 10 is supplied from the cutting edge portion 8 through the liquid supply hole 9 of the bit 7 to the drilling portion 101 (Figure 1).

In addition, in this embodiment, the predetermined amount of gap A through which the slide member 17 moves in the forward and backward directions is smaller than the arrangement gap B (FIGS. 1 and 6(b)) from the front surface of the shielding portion 50 to the cutting edge portion 8 of the bit 7 when the shielding portion 50 is urged forward by the urging mechanism 20. As a result, after the front surface of the shielding portion 50 is abutted against the drilled body 100, the arrangement gap B is pushed in by the predetermined amount of gap A, and then the inclined surface 17a of the slide member 17 separates from the seal member 15. Therefore, water L is supplied from the cutting edge portion 8 with the seal member 58 of the shielding portion 50 pressed against the drilled body 100 (FIG. 6(b)), and leakage of water L from between the shielding portion 50 and the drilled body 100 can be prevented. Note that the relationship between the predetermined gap A and the arrangement gap B is one example and is not limited to this embodiment.

(Shielding part)
4 is a drawing showing the shielding part 50 of the first drilling system 1 shown in FIG. 1, where (a) is a schematic view seen from the direction of the drilling device 2, and (b) is a central vertical cross-sectional view. In this embodiment, the shielding part 50 has a main body part 51 formed horizontally and a connecting part 52 is provided at both ends. The slide part 25 of the biasing mechanism 20 shown in FIG. 5 is connected to the connecting part 52. A guide member 53 that guides the front part of the bit 7 in the front-rear direction is provided in the central part of the main body part 51. A guide part 54 for the bit 7 is provided in the central part of the guide member 53, and a space part 55 is provided in the front part. A seal member 56 is provided between the guide member 53 and the main body part 51 to prevent the suspension S from leaking from between them. An O-ring can be used as the seal member 56.

A seal member 58 that comes into contact with the object to be perforated 100 is provided on the front surface of the main body 51. The seal member 58 is provided to seal the periphery of the space 55 and the periphery of the perforated portion 101. The seal member 58 can be made of a sponge material, a rubber material, or the like.

A recovery hole 57 is provided at the bottom of the main body 51, which leads from the space 55 to the outside. The first liquid recovery flow path 37 is connected to the recovery hole 57. The suspension S in the space 55 is recovered from the recovery hole 57 to the first liquid recovery flow path 37. The large diameter recovery hole 57A shown by the two-dot chain line is an example of the large diameter recovery hole 57A in the second drilling system 70 shown in Figure 7, which will be described later. The large diameter recovery hole 57A is connected to the large diameter upstream first liquid recovery flow path 37A, which will be described later.

(Biasing mechanism)
Fig. 5 is a schematic plan view of the biasing mechanism 20 that biases the shielding portion 50 shown in Fig. 4 toward the object 100 to be punched. Fig. 5 is a half cross-sectional view. The biasing mechanism 20 of this embodiment has a main body 21 that is attached to the liquid supply mechanism 10 of the punching device 2. The main body 21 is fixed to the outer surface of the liquid supply mechanism 10.

The main body 21 is provided with two guides 23 extending in the front-rear direction at the left and right positions of the liquid supply mechanism 10, and a slide portion 25 that slides in the front-rear direction along the guides 23. The guides 23 are inserted into holes in the main body 21 and are fixed to the main body 21 by fixing the two left and right positions with fixing bolts 22. The slide portion 25 is biased forward by a biasing spring 24 (biasing portion) provided inside the guides 23. The slide portion 25 is held at a predetermined position shown in the figure by a holding portion 26 (step portion) provided at the end of the guides 23, stopping it from sliding forward. The slide portion 25 is capable of sliding backward from the state shown in the figure against the biasing force of the biasing spring 24.

The shielding part 50 is fixed to the tip of the sliding part 25. This allows the shielding part 50 to move backward together with the sliding part 25 against the biasing force of the biasing spring 24.

(An example of drilling work)
6A and 6B are diagrams showing the operation of the shielding unit 50 and the biasing mechanism 20 shown in Fig. 5 during operation, where (a) is a schematic cross-sectional view before operation and (b) is a schematic cross-sectional view during operation. Based on Fig. 1 and these figures, an example of performing a drilling operation on a drilling target object 100 using the first drilling system 1 will be described.

First, as shown in FIG. 1, the components of the first drilling system 1 are connected. Then, the tube pumps 32 and 36 are switched on and operated, and the cutting edge 8 of the drilling device 2 is placed on the drilling portion 101 of the object to be drilled 100. In this state, the first tube pump 32 of the liquid supply device 31 attempts to supply water L from the liquid container 40 to the liquid supply mechanism 10 of the drilling device 2. However, as shown in FIG. 6(a), the slide member 17 of the liquid supply mechanism 10 abuts against the seal member 15, closing the end of the supply flow path 11a, so that water L is not supplied from the liquid container 40. The second tube pump 36 of the liquid recovery device 35 is in a state in which air is sucked from the space portion 55 of the shielding portion 50 (FIG. 4(b)). In this state, the seal member 58 of the shielding portion 50 provided in the drilling device 2 is applied to the drilling portion 101 of the object to be drilled 100.

Then, as shown in FIG. 6(b), the operating part 5 provided on the drill body 4 is operated to rotate the bit 7 while pressing the cutting edge 8 of the bit 7 against the body 100 to be drilled. This causes the shielding part 50 to be pressed against the body 100 to be drilled with an appropriate force by the biasing mechanism 20. In addition, by pressing the cutting edge 8 of the bit 7 against the body 100 to be drilled, the base of the bit 7 moves the slide member 17 backward within the range of the specified gap A against the biasing force of the biasing member 18.

As a result, the inclined surface 17a of the slide member 17 separates from the seal member 15, and the supply flow path 13a of the liquid supply unit 13 communicates with the liquid supply hole 9 of the bit 7 via the supply flow path 11a of the rotating unit 11, the space 11b, and the supply flow path 17b of the slide member 17. Therefore, when the cutting edge 8 of the bit 7 drills the object 100, the water L supplied from the liquid supply device 31 to the liquid supply mechanism 10 is supplied from the cutting edge 8 of the bit 7 to the drilling portion 101. Then, the suspension S in the space 55 of the shielding unit 50 is forcibly recovered by the second tube pump 36 of the liquid recovery device 35 via the first liquid recovery flow path 37 and the second liquid recovery flow path 38 into the liquid container 40.

In this way, by rotating the bit 7 and pressing the cutting edge 8 against the forward object 100 to be drilled, the cutting edge 8 drills the drilling portion 101 of the object 100 to be drilled. During this drilling operation, the first tube pump 32 forcibly supplies water L from the liquid container 40 from the cutting edge 8 of the drilling device 2 to the drilling portion 101, and the suspension S mixed with dust C from the object 100 to be drilled cut by the cutting edge 8 is forcibly recovered from the shielding portion 50 to the liquid container 40 via the first liquid recovery passage 37 and the second liquid recovery passage 38.

In addition, the suspension S collected by the liquid recovery device 35 and stored in the liquid container 40 has large dust particles C settling, and the water L from which the dust particles C have been removed by the strainer 47 at the top of the liquid container 40 is supplied again to the cutting edge 8 via the first liquid supply passage 33 and the second liquid supply passage 34. In other words, the water L supplied from the suspension S stored in the liquid container 40 to the cutting edge 8 of the bit 7 attached to the drilling device 2 is the water L obtained from the liquid surface and its vicinity, which contains less dust particles C, via the strainer 47 of the separation device 45, so that water L with less dust particles C is circulated to the cutting edge 8 of the drilling device 2. Moreover, since the tube pumps 32 and 36 are used to circulate the water L, it can be circulated appropriately even if some dust particles C are mixed in the water L.

Therefore, according to the first drilling system 1 described above, the liquid circulation system 30 appropriately supplies water L to the cutting edge 8, and the suspension S is forcibly collected to circulate the liquid while appropriately suppressing backflow, allowing the drilling device 2 to perform appropriate drilling operations on the object to be drilled 100.

In addition, according to the first drilling system 1 described above, the suspension S is forcibly collected from the shielding portion 50 that covers the drilling portion 101, so that the water L can be properly circulated even when the drilling operation is performed downward. Therefore, it is possible to properly perform drilling operation in various directions.

(Second drilling system according to the second embodiment)
FIG. 7 is a schematic diagram showing the overall configuration of the second drilling system 70 according to the second embodiment. FIG. 8 is a partially cross-sectional enlarged view showing a strainer 80 provided in the liquid recovery flow path of the second drilling system 70 shown in FIG. 7. The second drilling system 70 differs from the first drilling system 1 in the configuration of the first liquid recovery flow path 37 between the shielding part 50 and the second tube pump 36. For this reason, the second drilling system 70 will only be described in terms of the parts that are different from the first drilling system 1, and the same components as those of the first drilling system 1 will be given the same reference numerals and will not be described. The second drilling system 70 can be used in cases where there is a risk of large fragments D (e.g., about 3 to 5 mm) being mixed into the dust C generated by drilling with the cutting edge part 8.

As shown in FIG. 7, the second drilling system 70 is provided with a strainer 80 between the upstream first liquid recovery passage 37A and the downstream first liquid recovery passage 37B between the shielding portion 50 and the second tube pump 36. The upstream first liquid recovery passage 37A between the shielding portion 50 and the strainer 80 has a large diameter, and the downstream first liquid recovery passage 37B between the strainer 80 and the second tube pump 36 has the same diameter as the other passages (the second liquid recovery passage 38). The shielding portion 50 connecting the upstream first liquid recovery passage 37A is provided with a large diameter recovery hole 57A (FIG. 4(b)) corresponding to the diameter of the upstream first liquid recovery passage 37A. For example, the diameter of the downstream first liquid recovery passage 37B can be about 6 to 8 mm, and the diameter of the upstream first liquid recovery passage 37A can be about 10 to 12 mm. The diameter of the upstream first liquid recovery channel 37A can be about 1.2 to 2 times, preferably about 1.5 times, the diameter of the downstream first liquid recovery channel 37B. The diameter of the upstream first liquid recovery channel 37A and the large diameter recovery hole 57A of the shielding part 50 can be set according to the size of the large fragments D (Figure 8) that are generated by drilling with the cutting edge part 8.

As shown in FIG. 8, the strainer 80 has a cylindrical strainer body 81, an upstream strainer inlet 82 connected to the upstream first liquid recovery passage 37A, and a downstream strainer outlet 83 connected to the downstream first liquid recovery passage 37B. In this embodiment, the strainer 80 has a filter arrangement section 84 inclined toward the downstream direction at the bottom of the strainer body 81, and a cylindrical filter 85 is provided in this filter arrangement section 84. The filter 85 has a lower end blocked by a closing member 86 that blocks the lower end of the filter arrangement section 84. The cylindrical center of the filter 85 communicates with the upstream side, and the cylindrical outer periphery communicates with the downstream side. The filter 85 can be made of a wire mesh or the like that corresponds to the size of the large fragments D to be collected.

According to this strainer 80, the suspension S that enters the strainer body 81 from the upstream first liquid recovery passage 37A enters the filter 85 from the center, exits from the periphery, and flows into the downstream first liquid recovery passage 37B. Thus, large fragments D mixed in the suspension S are collected by the filter 85. Since not many large fragments D are usually generated in one day of work, the large fragments D can be collected in the filter 85 and work can be performed all day without interruption. The large fragments D collected in the filter 85 can be discharged by removing the closing member 86. Note that the strainer 80 in this embodiment is an example, and other types of strainers can also be used, and the strainer 80 is not limited to this embodiment.

The first drilling system 1 and the second drilling system 70 of the above-mentioned embodiment are provided with a cart 60 for transporting the liquid container 40, the first tube pump 32, and the second tube pump 36. This allows the entire system to be easily moved to the location where the drilling work is to be performed. The entire system can also be easily moved by using a backpack or shoulder bag instead of the cart 60. If the electric drill 3 of the drilling device 2 has a built-in battery, the cart 60 can be easily moved with the liquid container 40 placed on it, making it easy to change the position of the drilling work and allowing the drilling work to be performed appropriately even in a relatively narrow work site. The electric drill 3 of the drilling device 2 is not limited to a built-in battery configuration. The electric drill 3 may be configured to be powered via a power cord.

(Other Modifications)
In the above embodiment, an example was described in which a liquid supply mechanism 10 attached to an electric drill 3 is provided with a biasing mechanism 20 that biases the shielding portion 50 toward the body to be drilled 100, but the biasing mechanism 20 may also be provided in the drill body 4.

In the above embodiment, water L is used as an example of the liquid, but the liquid may be other than water L, and is not particularly limited as long as it is a liquid that can reduce friction between the cutting edge 8 and the object to be drilled 100 and can cool the cutting edge 8 that has generated heat due to friction between the cutting edge 8 and the object to be drilled 100.

Furthermore, the above-described embodiment is merely an example, and many modifications and other embodiments of the present invention will be apparent to those skilled in the art. Therefore, the above description should be construed as merely illustrative, and is provided for the purpose of teaching those skilled in the art the best mode for carrying out the present invention. Details of the structure and/or function of the present invention may be substantially modified without departing from the spirit of the present invention.

1. First drilling system
2. Perforation device
7 bit
8 Cutting edge
9 Liquid supply hole 10 Liquid supply mechanism 11 Rotating portion 13 Liquid supply portion 15 Sealing member 16 Bit mounting portion 17 Pressing member 18 Sealing member 20 Pressing mechanism 23 Guide portion 24 Pressing spring (pressing portion)
Description of the Reference Signs 25 Slide portion 30 Liquid circulation system 31 Liquid supply device 32 First tube pump 33 First liquid supply passage 34 Second liquid supply passage 35 Liquid recovery device 36 Second tube pump 37 First liquid recovery passage 37A First liquid recovery passage 37B First liquid recovery passage 38 Second liquid recovery passage 40 Liquid container 45 Separation device 46 Float 47 Strainer 50 Shielding portion 54 Guide portion 55 Space portion 56 Seal member 57 Recovery hole 57A Recovery hole 58 Seal member 70 Second drilling system 80 Strainer 83 Filter 84 Closing member 100 Object to be drilled 101 Drilled portion
A: Predetermined gap (predetermined amount)
B. Placement gap
L Water (liquid)
S Suspension
C. Dust
D. Large pieces

Claims (8)

a shielding part for covering a drilling part of a workpiece to be drilled by a cutting edge part of a bit attached to the drilling device;
A liquid container for storing liquid;
a liquid supply device that forcibly supplies the liquid stored in the liquid container to the blade tip;
a liquid recovery device for forcibly recovering the suspension from the portion blocked by the blocking part and returning it to the liquid container ,
the liquid supply device includes a first tube pump that forcibly supplies a portion of the liquid stored in the liquid container to the blade tip,
the liquid recovery device includes a second tube pump that forcibly recovers the suspension from the portion blocked by the blocking part into the liquid container,
a switch for operating/stopping the first tube pump and the second tube pump in conjunction with each other;
The first tube pump and the second tube pump are driven by a same drive shaft.
A liquid circulation system comprising: A strainer is further provided in a liquid recovery passage between the shielding portion and the second tube pump.
2. The liquid circulation system of claim 1 . The liquid recovery flow path between the shielding portion and the strainer is formed to have a width corresponding to the fragments of the object to be punched that are discharged from the shielding portion.
3. The liquid circulation system of claim 2 . The liquid circulation system according to any one of claims 1 to 3 , wherein the shielding portion has a seal member around the periphery of the perforation portion that contacts the object to be perforated. The liquid circulation system according to any one of claims 1 to 4 ,
The punching device has a liquid supply mechanism that opens and closes a supply flow path of the liquid supplied by the liquid supply device, and a biasing mechanism that biases the shielding part forward.
A drilling system comprising: the liquid supply mechanism has a slide member that moves a predetermined amount toward the rear of the drilling device together with the bit, and is configured so that the supply flow path is opened by the slide member moving the predetermined amount.
The drilling system of claim 5 . The cutting edge of the bit is disposed with a predetermined amount of placement gap from the front surface of the shielding part toward the liquid supply mechanism, and the predetermined amount by which the slide member of the liquid supply mechanism moves is set to be smaller than the placement gap.
The drilling system of claim 6 . The biasing mechanism includes a guide portion extending from the punching device toward the shielding portion, a slide portion having a front end to which the shielding portion is fixed and which slides while being guided by the guide portion, a biasing portion that biases the slide portion forward along the guide portion, and a holding portion that holds the slide portion at a predetermined position.
A drilling system according to any one of claims 5 to 7 .

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