Foam generation / supply device and hammer-based system comprising the same

Abstract

To provide a foam generation / supply device capable of suppressing pressure loss as much as possible in a foam flow path from a foam generation place to a supply destination.SOLUTION: A foam generation / supply device comprises: a stock solution tank 6 that stores a foam stock solution R and generates foam B by using an air blown into the foam stock solution R; an air supply mechanism 7 that supplies the air to the stock solution tank 6 via an air tube 8; and a foam feed hose 9 that connects the stock solution tank 6 and a dustproof cover 4. Therein the stock solution tank 6 includes: a pipe-shaped foam generation portion 34 whose upper end portion communicates with an upstream end of the foam feed hose 9 and whose lower end portion is immersed in the foam stock solution R; and a tube-shaped air blowing portion 35 that is inserted into the foam generation portion 34 in a state where an upstream end thereof communicates with the air tube 8 and blows the air into the foam stock solution R in the foam generation portion 34.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a foam generation and supply device that blows air into a foam stock solution to generate foam and continuously sends it to a supply destination, and a hammer-type work system equipped with the same.

Background Art

[0002] Conventionally, as this type of device, a foaming device for generating foam suitable for dust suppression is known (see Patent Document 1). This foaming device includes a foaming container that mixes a foaming agent and air to generate a foamy substance, a foaming agent supply means for supplying the foaming agent to the foaming container, an air supply means for supplying air to the foaming container, a pressurizing means for pressurizing the inside of the foaming container to increase the viscosity of the foamy substance and at the same time make the size finer, and a foamy substance supply means for supplying the foamy substance generated in the foaming container to the outside. The foaming agent supply means is composed of a foaming agent tank, a pump for supplying the foaming agent in the foaming agent tank to the foaming container, and a supply pipe connecting these to the foaming container. The air supply means is for increasing the viscosity of the foam and at the same time making the size finer, and is composed of an air compressor for supplying compressed air to the foaming container and a supply pipe connecting this to the lower part of the foaming container. The pressurizing means is composed of a pump, an air compressor, a foaming hose and a spraying nozzle described later. The foamy substance supply means is composed of a foaming hose connected to the upper part of the foaming container and a spraying nozzle connected to the tip of this. While sending the foaming agent in the foaming agent tank into the foaming container with a pump, air is sent into the foaming container from below with an air compressor. As a result, the foaming agent in the foaming container foams and foam is generated. Also, by slightly pressurizing the foaming container, the foam is pressurized to increase its viscosity and become finer. The foamed foam can be sprayed to the outside through the foaming hose and the spraying nozzle from the upper part of the foaming container.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0004] In such a conventional foaming device, in the flow path of the foam from the generating container to the supply destination via the foaming hose and the spraying nozzle, pressurizing means such as a pump or an air compressor are considered to adjust the pressure loss. That is, since the highly viscous fine foam is also a compressed fluid and has a large frictional loss when flowing through the flow path, unlike a simple liquid, the output of the pump or the air compressor is increased to compensate for the pressure loss. Therefore, there has been a problem that the device configuration becomes large and complicated. In addition, since the pressure difference between the foam generating part and the foam supply destination (atmospheric release part) becomes large, there has been a problem that the size of the foam cannot be appropriately controlled.

[0005] An object of the present invention is to provide a foam generating and supplying device capable of suppressing pressure loss as much as possible in the flow path of the foam from the foam generating location to the supply destination, and a hammer-type work system including the same.

MEANS FOR SOLVING THE PROBLEMS

[0006] The foam generating and supplying device of the present invention is a foam generating and supplying device that continuously sends foam to a supply destination while generating foam by blowing air into a foam stock solution, and stores the foam stock solution and generates foam by the air blown into the foam stock solution. A stock solution tank, an air supply mechanism that supplies air to the stock solution tank via an air tube, and a foam delivery hose that connects the stock solution tank and the supply destination. The stock solution tank communicates with the upstream end of the foam delivery hose at the upper end and has a pipe-shaped foam generating part with the lower end immersed in the foam stock solution, and an air blowing part in the form of a tube that is inserted into the foam generating part with the upstream end communicating with the air tube and blows air into the foam stock solution in the foam generating part.

[0007] According to this configuration, when air is supplied to the stock solution tank by the air supply mechanism, the supplied air is blown into the stock solution through the air blowing portion and generates bubbles in the bubble generating portion with its lower end immersed in the stock solution. The generated bubbles are continuously fed from the bubble generating portion (stock solution tank) through the bubble feed hose to the supply destination by the liquid feeding action of the air. In this case, bubbles are generated in the pipe-shaped bubble generating portion, and the generated bubbles are fed to the supply destination through the bubble feed hose communicating therewith. That is, in the bubble feed flow path from bubble generation to bubble feeding, the change in cross-sectional area can be minimized as much as possible. Thereby, in the feeding of bubbles, which are highly viscous and a compressed fluid, in the flow path, the flow path friction loss (pressure loss) can be suppressed as much as possible. Simply put, the pressure drop (pressure loss) is extremely large when bubbles generated in a stock solution tank with a large cross-sectional area are fed into a bubble feed hose with a small cross-sectional area, but the configuration of the present case where bubbles are generated in a small cross-sectional area can sufficiently suppress the pressure loss. Therefore, even without increasing the output of the air supply mechanism, the generated bubbles can be smoothly and continuously fed to the supply destination. Moreover, since there is little pressure fluctuation in this bubble feeding, the size of the bubbles can be easily controlled.

[0008] In this case, the stock solution tank preferably further includes a tank body that stores the stock solution and has an injection port at the upper part, and a lid-shaped member that opens and closes the injection port, and the bubble generating portion and the air blowing portion are attached to the lid-shaped member.

[0009] According to this configuration, since the bubble generating portion and the air blowing portion are attached to the lid-shaped member, when injecting the stock solution into the tank body by removing the lid-shaped member, the bubble generating portion and the air blowing portion do not get in the way. Also, maintenance of the bubble generating portion and the air blowing portion can be easily performed.

[0010] In this case, the foam generation part preferably has a bottom plate part with an inflow hole for the foam stock solution formed at the lower end part, and the air blowing part preferably has a blowing tube communicating with the air tube and a foam generation nozzle provided at the downstream end of the blowing tube and blowing out air toward the side.

[0011] According to this configuration, the generated foam will not leak out from the lower end part of the foam generation part into the stock solution tank (outside the foam generation part), and the foam can be efficiently generated and efficiently sent out.

[0012] Further, the lid-like member preferably has a lid main body that opens and closes the injection port and to which the foam generation part and the air blowing part are attached, and a hand-held part connected to the upper side of the lid main body.

[0013] According to this configuration, the stock solution tank with the injection port of the tank main body closed by the lid-like member can be easily carried by the hand-held part. Further, the hand-held part can easily pull out the foam generation part and the air blowing part from the tank main body via the lid-like member, and can easily open and close the injection port.

[0014] In this case, the lid main body is preferably provided with an internal foam flow path that communicates with the foam generation part and faces the upstream part of the air blowing part, and a through-fixing hole that connects the internal foam flow path and the outside and through which the upstream end part of the air blowing part penetrates and is fixed. The hand-held part is preferably provided with a hose connection port to which the upstream end of the foam delivery hose is connected, and an internal hand-held part foam flow path that communicates the internal foam flow path and the hose connection port.

[0015] According to this configuration, by providing the internal foam flow path in the lid main body, the air blowing part can be simply and appropriately incorporated into the lid main body, and the foam generation part and the foam delivery hose can be appropriately communicated.

[0016] Further, it is preferable to interpose a flow rate adjustment valve for adjusting the flow rate of air in the air tube.

[0017] According to this configuration, by adjusting the air flow rate with the flow control valve, the supply amount of the foam and the size of the generated foam can be freely adjusted.

[0018] The hammer-type work system of the present invention includes the above-described foam generation and supply device, a hammer-type electric tool to which a tip tool for performing any of the work operations of drilling, chipping, and roughing is detachably attached, and a dust cover that is attached to the hammer-type electric tool and covers the operating point of the work operation and the attached tip tool, and is characterized in that the supply destination of the foam generated by the foam generation and supply device is the dust cover.

[0019] According to this configuration, when a desired tip tool is attached to the hammer-type electric tool and the dust cover is attached so as to cover the tip tool to start the work operation, at this time, the foam is continuously supplied into the dust cover by the foam generation and supply device. Although concrete dust and crushed pieces are generated by the work operation of the tip tool, these dusts and the like are mixed with the foam in the dust cover. Therefore, the scattering of the dust into the atmosphere is prevented, and the dust and the crushed pieces can be appropriately and easily processed together with the foam. On the other hand, since the foam generation and supply device sends the highly viscous and compressed fluid foam to the dust cover while suppressing the pressure loss as much as possible, the foam can be continuously and smoothly supplied to the dust cover without a large-scale device configuration.

[0020] In this case, at least one notch opening for discharging the foam filled inside to the outside is formed at the tip of the dust cover, and it is preferable that the total opening area of the at least one notch opening is larger than the cross-sectional area of the foam feed hose.

[0021] According to this configuration, even at the most distal end of the dust cover, which is the supply destination of the foam, the pressure loss can be suppressed as much as possible, and the foam can be continuously and smoothly supplied to the dust cover. In addition, the dust and the crushed pieces can be wrapped with the foam and smoothly discharged outside the dust cover.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0023] Hereinafter, with reference to the accompanying drawings, a foam generation and supply device according to an embodiment of the present invention and a hammer-type work system equipped with the same will be described. The hammer-type work system uses a hammer-type power tool (rotary + impact tool and impact tool) represented by a hammer drill to supply foam to the operation point where the tip tool faces when performing any of the operations of drilling, chiseling, and roughing, thereby suppressing the generation of dust. A concrete drill bit is used as the tip tool for drilling, and special bits such as chisel-shaped and scoop-shaped bits are used as the tip tools for chiseling and roughing.

[0024] [Hammer-Type Work System] FIG. 1 is a device configuration diagram of the hammer-type work system of the present embodiment. As shown in the figure, the hammer-type work system 1 includes a hammer-type power tool 2 to which a tip tool 3 for performing any of the operations of drilling, chiseling, and roughing is detachably attached, a dust cover 4 attached to the hammer-type power tool 2 to cover the operation point P of the work operation and the tip tool 3 attached to the hammer-type power tool 2, and a foam generation and supply device 5 that supplies foam B to the inside of the dust cover 4 in accordance with the work operation.

[0025] The bubble generation and supply device 5 blows air into the bubble stock solution R to generate bubbles B while continuously sending them to the dust cover 4. It includes a stock solution tank 6 for generating bubbles B, an air supply mechanism 7 that supplies air to the stock solution tank 6 via an air tube 8, and a bubble feed hose 9 that connects the stock solution tank 6 and the dust cover 4.

[0026] The hammer-type power tool 2 is a power tool that performs a working operation of rotation + impact or impact on concrete (mortar) or stone as the work object. So-called vibration drills, hammer drills, hammers, etc. fall under this category. Also, various bits are prepared for the tip tool 3 that is detachably attached to the hammer-type power tool 2 according to the working operation as described above. And in this hammer-type working operation, basically dust and crushed pieces are generated.

[0027] In this embodiment, bubbles B are introduced into the operation point P where dust and crushed pieces are generated, and the generated dust and crushed pieces are mixed with bubbles B to prevent the scattering of dust (see Fig. 1). And the introduction of bubbles B into the operation point P is performed through the dust cover 4 attached to the hammer-type power tool 2 so as to cover the tip tool 3.

[0028] [Dust cover] As shown in Figs. 1 and 2, the dust cover 4 has a bellows-shaped cover body 11 and a cover attachment 12 interposed between the hammer-type power tool 2 and the cover body 11. The cover body 11 is formed in a bellows shape from a soft resin (plastic) so as to be stretchable in the direction (axial direction) of the working operation. Also, the cover body 11 is formed from a translucent resin so that the internal tip tool 3 can be visually recognized. Thereby, in the working operation, the tip tool 3 can be appropriately faced to the operation point P.

[0029] Although not particularly shown, the cover body 11 of the present embodiment is provided with a plurality of types having different lengths (including those in pairs) according to the length of the tip tool 3 to be used. That is, the cover body 11 has a length such that the tip tool 3 mounted on the hammer-type power tool 2 in a free state can be accommodated inside, and expands and contracts by a working operation (in the direction of the working operation).

[0030] An annular abutting portion 14 that abuts against the work object is formed at the tip of the cover body 11. Four notch openings 15 for discharging the foam B filled in the cover body 11 to the outside are formed in the abutting portion 14. The four notch openings 15 are arranged so as to cut from the tip side of the abutting portion 14 and to be evenly distributed in the circumferential direction.

[0031] During the working operation, the foam B is supplied from the foam generation / supply device 5 to the cover body 11, and the inside of the cover body 11 is filled with the foam B. Dust and crushed pieces generated by the working operation are mixed with the foam B and are pushed out by the new foam B supplied to the cover body 11, and flow out to the outside through the four notch openings 15.

[0032] In this case, the four notch openings 15 are formed such that their total opening area is larger than the cross-sectional area of the foam feed hose 9 described later. Thereby, the foam in the cover body 11 flows slowly and smoothly toward the tip (the flow path frictional resistance is small), and smoothly flows out to the outside through the four notch openings 15 while containing dust and crushed pieces. Then, the foam B mixed with dust and crushed pieces pushed out to the outside from each notch opening 15 is wiped off with a wipe (paper wipe). The foam B mixed with dust and crushed pieces wiped off with a wipe is sealed in a garbage bag and treated as industrial waste.

[0033] An annular joint receiving portion 16 into which the tip of the cover attachment 12 is inserted and joined is formed at the base end portion of the cover body 11. As described above, a plurality of types of the cover body 11 having different lengths are provided, and the plurality of types of cover bodies 11 can be selectively attached to the cover attachment 12 via this joint receiving portion 16.

[0034] As shown in Fig. 2, the cover attachment 12 has a base end portion attached to the chuck portion 2a (tip portion) of the hammer-type power tool 2, and a cover body 11 is detachably attached to the tip portion, and it is formed in a cylindrical shape as a whole. Further, a sealing rubber 22 for shielding the foam B is attached inside the cover attachment 12. The main part of the cover attachment 12 is formed of plastic or metal, but the one in the embodiment is formed of aluminum. Further, the sealing rubber 22 is formed of a rubber material having a Shore A hardness of 30 to 40 degrees, for example, NBR (nitrile rubber).

[0035] An annular joint portion 24 that is joined to the joint receiving portion 16 of the cover body 11 is formed at the tip portion of the cover attachment 12. That is, the female joint receiving portion 16 is joined to the male joint portion 24, whereby the cover body 11 is detachably attached to the cover attachment 12.

[0036] A foam inlet 25 for introducing the foam B supplied from the foam generating / supplying device 5 into the cover body 11 is formed at an intermediate front portion of the cover attachment 12 continuous with the joint portion 24. The foam inlet 25 communicates with the touch body 21 at an inclination angle facing somewhat forward. And a foam feed hose 9 described later is connected to this foam inlet 25.

[0037] A sealing rubber 22 having a through hole is attached inside the intermediate portion of the cover attachment 12. The chucked portion 3a of the tip tool 3 attached to the hammer-type power tool 2 is sealed so as to penetrate through this sealing rubber 22. The tip tool 3 in the working operation rotates and / or reciprocates (strikes) violently. At that time, the foam B flowing through the tip tool 3 is sealed by the sealing rubber 22, so that the foam B hardly enters the hammer-type power tool 2 side.

[0038] At the middle rear part of the cover attachment 12, that is, between the base end portion and the seal rubber 22, air discharge openings 26 are formed at four locations in the circumferential direction. The air discharge openings 26 guide the air bubbles B that have flowed into the base end portion side of the cover attachment 12 beyond the seal rubber 22 to the outside. Thereby, even if the air bubbles B may enter the chuck portion 2a side beyond the seal rubber 22, the air bubbles B are guided to the outside through the air discharge openings 26 and do not reach the hammer-type electric tool 2 side.

[0039] At the base end portion of the cover attachment 12, an insertion attachment portion 27 is formed that is detachably inserted and attached to the tip portion (chuck portion 2a) of the hammer-type electric tool 2. The insertion attachment portion 27 has an annular base portion 27a against which the tip portion of the hammer-type electric tool 2 abuts, and three arc-shaped pieces 27b that project axially from the annular base portion 27a and are inserted into the tip portion of the hammer-type electric tool 2. The three arc-shaped pieces 27b form a cylindrical contour and are evenly arranged in the circumferential direction.

[0040] When the insertion attachment portion 27 of the cover attachment 12 is inserted so as to cover the tip portion (chuck portion 2a) of the hammer-type electric tool 2, the three springy arc-shaped pieces 27b are appropriately bent, and the cover attachment 12 is smoothly and fittingly attached to the chuck portion 2a. Similarly, the detachment of the cover attachment 12 from the chuck portion 2a is also smoothly performed.

[0041] [Foam Generation and Supply Device] As shown in FIGS. 1, 3, and 4, the foam generation and supply device 5 includes a stock solution tank 6 that stores the foam stock solution R and generates the foam B by the air blown into the foam stock solution R, an air supply mechanism 7 that supplies air to the stock solution tank 6 via an air tube 8, and a foam feed hose 9 made of silicone rubber or the like that connects the stock solution tank 6 and the dust cover 4 (cover attachment 12).

[0042] Air is supplied from the air supply mechanism 7 through the air tube 8 and blown into the foam stock solution R in the stock solution tank 6, thereby generating foam B. Further, the generated foam B is sent from the stock solution tank 6 through the foam feed hose 9 to the dust cover 4 by the liquid feeding action of the air. The generation and feeding of this foam B are continuously performed by driving the air supply mechanism 7. Incidentally, it is preferable to drive the air supply mechanism 7 in synchronization with the driving of the hammer-type power tool 2.

[0043] The air supply mechanism 7 includes an air compressor 10 that constitutes an air supply source, and an air tube 8 that sends compressed air from the air compressor 10 to the stock solution tank 7. The air compressor 10 in this case has an output specification that combines the air pressure for generating the foam B and the air pressure for sending the generated foam B to the dust cover 4. In particular, it is necessary to fully consider the pressure loss of the foam B, which is a viscous fluid, in the flow path.

[0044] On the other hand, in the air supply by the air compressor 10, when the flow rate is low (the flow velocity in the flow path is slow), there is a problem that it takes time for the foam generated at the start of the operation to reach the dust cover 4 (operation point P). Conversely, when the flow rate is high (the flow velocity in the flow path is fast), foam can be supplied quickly in accordance with the start of the operation, but there is a problem that the size of the foam becomes non-uniform and it is difficult to obtain foam of a size suitable for the operation.

[0045] Therefore, in this embodiment, a flow rate adjustment valve 30 for adjusting the air flow rate is provided in the air tube 8. In this case, the flow rate adjustment valve 30 is provided in the air tube 8 in the vicinity of the stock solution tank 7 so that the air can be adjusted appropriately by the operator.

[0046] For example, the operation of the flow rate adjustment valve 30 supplies the foam generated with full opening at the start of work to the dust cover 4 (operating point P) quickly. On the other hand, when adjusting the size of the foam according to the type of work and attempting to supply it stably, the flow rate of the air is adjusted by the flow rate adjustment valve 30. Or, the supply amount of the foam is adjusted according to the progress of the work. In this way, the work efficiency is improved.

[0047] The stock solution tank 7 includes a tank body 31 that stores the foam stock solution R and has a wide-mouth injection port 32 at the upper part, a lid-like member 33 that opens and closes the injection port 32, a pipe-shaped foam generation part 34 attached so as to hang down from the lid-like member 33, and a tube-shaped air blowing part 35 inserted into the foam generation part 34. Although details will be described later, the air blowing part 35 is composed of a blowing tube 54 and a foaming nozzle 55, and the blowing tube 54 and the above-mentioned air tube 8 are integrally formed.

[0048] The tank body 31 is composed of a resin tank of about 50 L and stores about 20 L of the foam stock solution R in an initial state inside. The foam stock solution R enables the generation of foam B by blowing air, and it is preferably a solution in which one or more of glycerin, water-soluble resin, glycols, esters, sugars, and bentonite are added to any one of anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants.

[0049] Alternatively, the foam stock solution R is preferably a solution in which one or more of glycerin, water-soluble resin, glycols, esters, sugars, and bentonite are added to two or more kinds of surfactants among anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants. With the foam stock solution R configured in this way, the lifespan of the generated foam B can be easily controlled.

[0050] The lid-shaped member 33 has a lid body 37 that opens and closes the injection port 32 and to which the foam generation section 34 and the air blowing section 35 are attached, and a linear-shaped hand-held section 38 connected to the upper side of the lid body 37. In this case, the hand-held section 38 not only facilitates the opening and closing of the injection port 32 when replenishing the foam stock solution R, but is also utilized when transporting the stock solution tank 7. Further, the hand-held section 38 enables the foam generation section 34 and the air blowing section 35 to be easily removed during maintenance or the like.

[0051] The lid body 37 is composed of an upper lid body 37A to which the hand-held section 38 is attached and a lower lid body 37B that opens and closes the injection port 32, and these are screw-joined in such a manner that the upper half of the lower lid body 37B is inserted into the upper lid body 37A. The hand-held section 38 is screw-joined to the upper part of the upper lid body 37A, and a tube seal 39 for sealing the boundary portion between the air tube 8 and the air blowing section 35 as a unit is provided on the side portion.

[0052] An opening and closing screw portion 41 for joining to the injection port 32 is formed at the lower part of the lower lid body 37B, and an annular groove 42 for an O-ring 43 is formed above the opening and closing screw portion 41. When the lid-shaped member 33 is screwed in while inserting it into the injection port 32 of the tank body 31 with the O-ring 43 mounted in the annular groove 42, the injection port 32 is sealed in a liquid-tight manner, and at the same time, the lid-shaped member 33 (hand-held section 38) is firmly attached to the tank body 31.

[0053] Inside the lid body 37, a main body internal foam flow path 45 for guiding the generated foam B to the hand-held section 38 side is formed from the lower lid body 37B to the upper lid body 37A. The main body internal foam flow path 45 is composed of a funnel-shaped flow path section 45a, a thick flow path section 45b, and a thin flow path section 45c. The lower end portion of the funnel-shaped flow path section 45a communicates with the foam generation section 34, and the upper end portion of the thin flow path section 45c communicates with a hand-held section internal foam flow path 47 described later. The foam B generated in the foam generation section 34 rises and flows into the main body internal foam flow path 45, and is further guided from the main body internal foam flow path 45 to the hand-held section internal foam flow path 47.

[0054] The thick flow path portion 45b faces the upstream portion (curved portion) of the blowing tube 54 described later that is inserted into the bubble generation portion 34. The upper lid body 37A is provided with a through-hole 46 that connects the thick flow path portion 45b to the outside and through which the upstream end portion of the blowing tube 54 penetrates and is fixed. The upstream end portion of the blowing tube 54 is liquid-tightly fixed by the tube seal 39 provided in the through-hole 46.

[0055] Inside the hand-held portion 38, a hand-held portion internal bubble flow path 47 that is continuous with the internal body bubble flow path 45 (thin flow path portion 45c) is formed. The downstream side of the hand-held portion internal bubble flow path 47 extends to one end of the hand-held portion 38, and a hose connection port 48 that serves as the downstream end of the hand-held portion internal bubble flow path 47 is provided at this end. The upstream end of the bubble feed hose 9 is inserted and connected to the hose connection port 48 (see FIG. 1).

[0056] In this case, the inner diameter of the bubble feed hose 9 and the flow path diameter of the hand-held portion internal bubble flow path 47 are formed to be the same diameter, and the flow path has few bends. Therefore, the bubble flow path composed of the hand-held portion internal bubble flow path 47 and the bubble feed hose 9 has a flow path configuration that minimizes pressure loss.

[0057] The bubble generation portion 34 is formed in a pipe shape, communicates with the internal body bubble flow path 45 at the upper end portion, and the lower end portion is immersed in the bubble stock solution R (see FIG. 3). The bubble generation portion 34 has a bottom plate portion 51 that forms an inflow hole 52 for the bubble stock solution R at the lower end portion. The lower end portion of the bubble generation portion 34 extends to a deep position so that the bubble stock solution R is always in a state of being immersed in the bubble stock solution R even when the bubble stock solution R decreases. Then, the bubble stock solution R in the bubble generation portion 34 that has decreased due to the generation of the bubbles B is replenished from the inflow hole 52 according to the liquid level.

[0058] The air blowing section 35 is a tube-shaped member that is inserted into the foam generating section 34 with its upstream end communicating with the air tube 8 and blows air into the foam stock solution R in the foam generating section 34. It has a blowing tube 54 that communicates with the air tube 8 and a foaming nozzle 55 provided at the downstream end of the blowing tube 54. In this case, the foaming nozzle 55 has a nozzle opening 55a formed on its side surface, and the air blown into the foam stock solution R is blown out sideways.

[0059] Due to the sideways blowing of air from this foaming nozzle 55 and the structure of the bottom plate portion 51 of the foam generating section 34, air does not leak out of the foam generating section 34, and foam B can be efficiently generated within the foam generating section 34.

[0060] The air blown out from the foaming nozzle 55 is blown into the foam stock solution R within the pipe-shaped foam generating section 34 and becomes foam B at the position of the liquid level of the foam stock solution R. Since air is continuously supplied to the foam generating section 34 from the air compressor 10, foam B is continuously generated within the foam generating section 34. The generated foam B rises within the foam generating section 34 and further flows through the in-body foam flow path 45, the in-handle foam flow path 47, and the foam delivery hose 9 to be supplied to the dust cover 4.

[0061] FIG. 5 shows a modified example around the lid-shaped member 33. As shown in the figure, in the lid body 37 in the modified example, the in-body foam flow path 45A has a funnel-shaped flow path portion 45Aa, a thick flow path portion 45Ab, an inverted funnel-shaped flow path portion 45Ac, and a thin flow path portion 45Ad. In this case, since the inverted funnel-shaped flow path portion 45Ac is provided between the thick flow path portion 45Ab and the thin flow path portion 45Ad, the flow path resistance (pressure loss) of the in-body foam flow path 45A can be reduced, and the foam can be smoothly sent out.

[0062] In the large-diameter flow path portion 45Ab, a tube joint 57 fixed to the through-hole 46 faces. One end of the tube joint 57 located within the large-diameter flow path portion 45b is connected to the blowing tube 54 from below, and the other end of the tube joint 57 located outside is connected to the air tube 8. Thus, the air tube 8 and the blowing tube 54 can be easily disconnected and connected.

[0063] Also, in the foam generation portion 34 in the modified example, the bottom plate portion 51 is absent and it is formed in a simple cylindrical shape. On the other hand, although the nozzle port 55a of the foam nozzle 55 is formed on the lower surface, it is disposed at a somewhat separated position upward from the lower end of the foam generation portion 34. The air is blown downward from the lower end of the foam nozzle 55, but immediately turns upward, and the air does not leak from the lower end of the foam generation portion 34.

[0064] As described above, in the flow path of the foam B of the present embodiment, although there is a somewhat change in the cross-sectional area in the internal body foam flow paths 45, 45A, the change in the cross-sectional area is minimized as a whole. For this reason, in the feeding of the highly viscous and compressible fluid foam B in the flow path, the flow path friction loss (pressure loss) can be suppressed as much as possible. In particular, since the foam B is generated by the pipe-shaped foam generation portion 34 and the feeding of the foam B is carried out from this foam generation portion 34, the pressure loss can be sufficiently suppressed. Therefore, even without increasing the output of the air supply mechanism 7, etc., the generated foam B can be smoothly and continuously sent to the dust cover 4. Moreover, since there is little pressure fluctuation in this foam feeding, the size of the foam B can be easily controlled.

[0065] The flow path dimensions of the foam B in each part of the present embodiment are as follows: the foam generation portion 34 where the foam B is generated has a diameter of 14 mm, the narrow part of the internal body foam flow path 45 that guides the generated foam B upward has a diameter of 14 mm, the thick part has a diameter of 40 mm (in the modified example, it is 20 mm), the hand-held part internal foam flow path 47 following the internal body foam flow path 45 has a diameter of 12 mm, and the foam feeding hose 9 connected thereto has a diameter of 12 mm.

[0066] Moreover, according to the hammer-type working system 1 of the present embodiment, the foam B is continuously and appropriately supplied to the operating point P through the dust cover 4. As a result, in the dust cover 4, the generated concrete dust and crushed pieces can be mixed with the foam B. Therefore, the scattering of dust into the atmosphere is prevented, and the dust and crushed pieces can be appropriately and easily processed together with the foam B.

[0067] In addition, this hammer-type working system 1 is particularly useful when working on mortar or lightweight concrete containing asbestos. The foam B can prevent the scattering of asbestos into the atmosphere together with the dust and can be appropriately processed.

Explanation of Reference Numerals

[0068] 1…Hammer-type working system, 2…Hammer-type electric tool, 3…Tip tool, 4…Dust cover, 5…Foam generation and supply device, 6…Stock solution tank, 7…Air supply mechanism, 8…Air tube, 9…Foam feed hose, 10…Air compressor, 11…Cover body, 12…Cover attachment, 15…Notch opening, 30…Flow rate adjustment valve, 31…Tank body, 32…Inlet, 33…Cover-like member, 34…Foam generation part, 35…Air blowing part, 37…Cover body, 38…Holding part, 45, 45A…Internal foam flow path in the main body, 46…Through hole for fixing, 47…Internal foam flow path in the holding part, 48…Hose connection port, 51…Bottom plate part, 52…Inflow hole, 54…Blowing tube, 55…Foaming nozzle, B…Foam, P…Operating point, R…Foam stock solution,

Claims

1. A foam generating and supplying device that blows air into a foam concentrate to generate foam and continuously sends it to a supply destination, The device includes a concentrate tank that stores the foam concentrate and generates foam by blowing air into the foam concentrate, an air supply mechanism that supplies the air to the concentrate tank via an air tube, and a foam feed hose that connects the concentrate tank to the supply destination, The concentrate tank comprises: A pipe-shaped foam generating section whose upper end is connected to the upstream end of the foam delivery hose and whose lower end is immersed in the foam concentrate; A foam generating and supplying device characterized by having a tubular air blowing section that is inserted into the foam generating section with its upstream end connected to the air tube and blows air into the foam concentrate in the foam generating section.

2. The concentrate tank comprises: A tank body for storing the foam concentrate and having an inlet at an upper portion; A lid-like member for opening and closing the injection port, 2. The foam generating and supplying device according to claim 1, wherein the foam generating unit and the air blowing unit are attached to the lid-like member.

3. The foam generating unit has a bottom plate portion having an inlet hole for the foam concentrate formed at a lower end thereof, The foam generating and supplying device according to claim 2, characterized in that the air blowing section has a blowing tube communicating with the air tube, and a foaming nozzle provided at the downstream end of the blowing tube for blowing air sideways.

4. The lid-like member is a lid body that opens and closes the injection port and to which the foam generating unit and the air blowing unit are attached; 3. The foam generating and dispensing device according to claim 2, further comprising a handle connected to an upper side of the lid body.

5. The lid body is provided with a foam flow path in the body that communicates with the foam generating section and faces the upstream section of the air blowing section, and a through-hole that connects the foam flow path in the body with the outside and through which the upstream end of the air blowing section passes and is fixed, The foam generating and supplying device described in claim 4, characterized in that the hand-held portion is provided with a hose connection port to which the upstream end of the foam delivery hose is connected, and a foam flow path in the hand-held portion that connects the foam flow path in the main body with the hose connection port.

6. 2. The foam generating and supplying device according to claim 1, wherein a flow rate adjusting valve for adjusting a flow rate of air is provided in the air tube.

7. A foam generating and supplying device according to any one of claims 1 to 6, a hammer-type power tool to which a tip tool for performing any one of drilling, chipping and roughing operations is detachably attached; a dust cover attached to the hammer-type power tool and covering an operating point of the work operation and the attached tip tool; A hammer-type work system, characterized in that the destination of the foam generated by the foam generating / supplying device is the dust cover.

8. The tip of the dust cover is formed with one or more notched openings for allowing the foam filled inside to escape to the outside, 8. The hammer-based work system of claim 7, wherein a total open area of ​​said one or more cutout openings is greater than a cross-sectional area of ​​said foam delivery hose.

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