JPH0243150Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a spray nozzle used as a spraying part for spraying material when spray painting buildings and various articles.

More specifically, it relates to a spray nozzle equipped with a spray material supply hole that supplies the spray material, and a diffusion air jet hole that spouts compressed air that makes the spray material supplied from the spray material supply hole into a spray form and diffuses it. .

The term spray material includes all spray finishing materials such as cement ricin and acrylic ricin, fireproof coating materials such as rock wool, and various paints.

[Conventional technology]

Examples of the above-mentioned spray nozzle include one in which a diffusion air jet hole is provided around a spray material supply hole,
On the other hand, it is known that an annular spraying material supply hole is provided around the diffusion air outlet. Then, the compressed air ejected from the diffusion air outlet creates a negative pressure in front of the spray material supply hole, and sucks up the spray material.
The spray material is made into fine particles using compressed air and then sprayed. Furthermore, there is also known a device in which separate air ejection holes are provided on both sides of the spray material supply hole so that the spray pattern of the spray material to be injected can be changed from circular to elliptical.

[Problem that the invention attempts to solve]

However, in the case of the conventional configuration described above, there were problems as described below, and there was room for improvement.

In any of the configurations mentioned above, the injection center of the diffused spray material, that is, the direction of the axis of the cone formed by the sprayed spray material coincides with the nozzle center. Therefore, when the target to be sprayed has irregularities, for example, in joints in buildings, window wrappers, etc., areas that are visible in the depth direction, so-called prospective areas, tend to be incompletely sprayed.

In other words, in order to properly spray the flat surface to be sprayed, if the spray nozzle is positioned almost perpendicular to the flat surface and there is a potential area mentioned above, the This is because the spraying direction of the material is approximately parallel to the expected portion, so that the amount of sprayed material that reaches the innermost part of the expected portion is smaller than that on a flat surface. Therefore, the work that requires skill, such as changing the attitude of the spray nozzle as appropriate, increases.

Moreover, this poses an obstacle when automating spraying work, which has become popular in recent years. That is, when spraying work is performed automatically, it is basically preferable from the viewpoint of work efficiency to keep the attitude of the spray nozzle as constant as possible.

In view of the above-mentioned circumstances, an object of the present invention is to make it possible to spray the expected area of the target to be sprayed well during spraying while minimizing changes in the working posture.

[Means for solving problems]

The characteristic configuration of the spray nozzle according to the present invention includes a spray material supply hole that supplies the spray material, a diffusion air outlet that spouts compressed air that makes the spray material supplied from the spray material supply hole into a spray and diffuses it, and A deflection air ejection hole is provided for ejecting compressed air that deflects the direction of the ejection center of the diffused spray material from the center of the nozzle.

[Effect]

In other words, when spraying onto a flat surface where there is a prospective part, if you change the direction of spraying material diffused by the compressed air from the deflection air outlet, the spray nozzle will be in an almost perpendicular position to the flat surface. In this position, the injected spray material will be directed toward the target area, and the spray material can reach the innermost part of the target area in a good manner and reliably.

Moreover, since the bottom of the cone formed by the sprayed material is inclined with respect to the flat surface, the material is sprayed almost evenly to the back and front sides of the prospective area, as well as to the ends of the flat surface. It is possible to spray the material.

[Effect of idea]

Therefore, even if the target to be sprayed is not only a flat surface but also has grooves or deep joints as a prospective part, it is possible to spray both the flat surface and the prospective part without changing the attitude of the spray nozzle at all. It is now possible to spray the spray material well and reliably.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 3, a wall painting machine spray-paints paint as a spraying material onto a wall surface W of a building from a trolley 1, a guide mast 2, and a spray device 3 equipped with a spray nozzle Na according to the present invention. It consists of X.

The trolley 1 has an upper frame 1a and a lower frame 1.
The lower frame 1b is composed of
It has a pair of drive wheels 5 driven by a travel drive device 4 such as a motor, and an idler wheel (not shown). Further, a travel path detection sensor 6 made of a reflective photo sensor is attached to the lower part of the lower frame 1b.

A traveling guide tape 7 is pasted in advance on the ground facing the traveling path detection sensor 6, substantially parallel to the wall surface W of the building to be sprayed.
Then, based on the detection information from the traveling path detection sensor 6, the control device 8 is configured to maintain a constant positional relationship between the traveling guide tape 7 and the traveling path detection sensor 6 when the trolley 1 moves. Therefore, the driving of the travel drive device 4 is controlled. This results in
The cart 1 can move approximately parallel to the wall surface W.

A guide mast 2 is erected on the upper frame 1a of the truck 1, and a control device 8, various winding devices 9 to 12, etc., which will be described later, are fixedly installed. Further, a level gauge 13 is provided on the upper frame 1a. Then, the control device 8 controls the horizontal adjustment drive device 14 based on the signal from the level meter 13.
to drive the lower frame 1 of the upper frame 1a.
The structure is such that the upper frame 1a can always be maintained in a substantially horizontal position by changing the mounting position relative to the upper frame 1a.

The guide mast 2 is attached so as to be swingable around an axis _P1 . A male threaded member 17 is pivotally attached to the lower end of the rod 16 that is pivoted to the bracket 15 near the upper end of the guide mast 2, and a female threaded member (not shown) is screwed into the male threaded member 17.
is fixed to the rotating shaft of a mast inclination adjustment motor 18 provided on the upper frame 1a of the truck 1.

That is, by rotating this motor 18, the male screw member 17 moves up and down, and the guide mast 2
The angle of inclination can be changed. Further, an inclinometer 19 is attached to the guide mast 2, and the control device 8 controls the above-mentioned mast inclination adjustment motor 18 based on a signal from the inclinometer 19.
By controlling the drive of the guide mast 2, the guide mast 2 can be maintained in a substantially vertical position at all times.

Further, the spray device 3 is suspended and supported by a wire 21 wound around a pair of rollers 20 attached to the upper end of the guide mast 2 .
This wire 21 is wound around a wire winding device 9 provided on the upper frame 1a of the truck 1. Also,
A guide roller 22 attached to the spray device 3 engages with a flange portion of the guide mast 2.

That is, by driving the motor 9a for the wire winding device 9, the spraying device 3 can be moved up and down along the guide mast 2.

The spraying device 3 includes a plurality of spraying nozzles Na, Nb.
In addition, a plurality of sensors 23 for detecting the state of the wall surface W and the distance from the wall surface W, a television camera 24 for monitoring, etc. are mounted. And signal transmission between each of these sensors 23 and the control device 8,
A coaxial cable 26 for transmitting signals between the television camera 24 and the monitor television 25 is
The cable is wound around a cable winding device 10 provided on the upper frame 1a of the truck 1.

Further, the paint hose 27 and the air hose 28 that supply paint and compressed air to the spraying device 3 are, respectively,
A paint hose winding device 11 and an air hose winding device 1 are separately provided on the upper frame 1a of the trolley 1.
It is designed to be wound up into 2.

The drive motors 9a to 12a for the winding devices 9 to 12 described above are configured so that their driving is controlled by control signals output from the control device 8, respectively.

Next, the spraying device 3 will be explained.

As shown in FIG. 4, a paint tank 30 is provided at the top of the case 29.
A paint hose 27 is connected to 0. Moreover, as shown in FIGS. 4 and 5, this paint tank 3
Below 0, multiple spray nozzles Na, Nb
are arranged and fixed on a moving table 31 so as to be substantially parallel to each other.

The tips of each of the spray nozzles Na and Nb protrude outward from the case 29 from an opening formed in the case 29. The movable table 31 moves the spray nozzle to a fixed table 32 fixed to the bottom of the case 29.
The structure allows Na and Nb to slide freely in the longitudinal direction. Further, a male screw member 33 fixed to the rear end of the movable table 31 is screwed into a female screw member (not shown) that is interlocked with the rotating shaft of a motor 34 provided on the fixed table 32.

That is, by driving and rotating this motor 34 in either the forward or reverse direction, the moving table 31
can be moved back and forth. Therefore, by changing the amount of protrusion of the tip of each spray nozzle Na, Nb from the case 29, the spraying distance to the wall surface W to be sprayed can be changed without moving the case 29. This motor 3
4 is configured to be controlled by a control signal output from the control device 8 mentioned earlier.

Paint from a paint tank 30 is supplied to each spray nozzle Na, Nb through a paint tube 37 having a stop valve 36, respectively. Furthermore, compressed air supplied from the air hose 28 via the stop valve 38 is supplied to each of the spray nozzles Na and Nb by a first air manifold 39.
The air is divided into systems, and each system is further divided and supplied by a second air manifold 40 and a third air manifold 41. One nozzle Na among the multiple spray nozzles Na and Nb is
This is based on the present invention, and compressed air distributed by the first air manifold 39 is supplied to an air port, which will be described later, provided only in this nozzle Na.

Further, a plurality of sensors 23 are provided on the surface of the case 29 of the spraying device 3 facing the wall surface W over four circumferences thereof. Those multiple sensors 2
3, the sensors 23a located at the four corners of this surface
is used exclusively to detect the distance between the spray device 3 and the wall surface W, and the other sensors 23b are:
It is used exclusively to detect openings and the like existing in the wall surface W. All of the detection information from these sensors 23 is input to the control device 8.

Next, regarding the spray nozzle Na according to the present invention,
I will explain further.

FIG. 1 shows a longitudinal section of this nozzle Na.
A paint tube 37 from the paint tank 30 is connected to the paint port 42a of the nozzle body 42. Further, an air pipe 44 that is connected to the air tube 43 and forms a compressed air passage A is provided to fit inside the nozzle body 42, and between this air pipe 44 and the nozzle body 42, a paint passage E is provided. is formed.

And from air tube 43 to airport 44
The compressed air supplied through the air pipe 44
By being ejected from the diffusion air ejection hole a at the tip of the nozzle body 42, the pressure around it decreases and the paint is sucked, and from the paint supply hole e at the tip of the nozzle body 42,
The paint is sprayed in the form of a spray. As shown in FIG. 5, the air tube 43 described above has a stop valve 45 and a pressure regulating valve 46.
via a second air manifold 40 which distributes compressed air to each nozzle Na, Nb.
The second air manifold 40 is connected to the first air manifold 39 via a stop valve 47.

Returning to Figure 1 and continuing the explanation, air pipe 4
A flange portion 44b integrally connected to the outer periphery of the nozzle body 42 is positioned to airtightly divide the cylinder chamber S formed at the rear end of the nozzle body 42 into two. Air tubes 48 and 49 for supplying compressed air are connected to air ports 42b and 42c provided in the two divided cylinder chambers _S1 and _S2 , respectively. These air tubes 48, 49 are connected to a third air manifold 41 via a switching valve 50 and a stop valve 51, as shown in FIG.
From either airport (42b or 42c),
Compressed air is sent into the cylinder chamber (S ₁ or S ₂ ) communicating with the air port (42b or 42c). In the figure, 60 is a stop valve.

In Figure 1, the airport 42b on the right side of the figure
When compressed air is fed into the air pipe 44, the air pipe 44 moves to the left in the figure, and paint is sprayed from the tip of the nozzle Na as described above. On the other hand, when compressed air is sent into the air port 42c on the left side in the figure, the air pipe 44 moves to the right in the figure.
When the air pipe 44 reaches the right stroke end, the outer circumferential surface of the tip of the air pipe 44 comes into contact with the inner circumferential surface of the nozzle body 42, and the supply of paint is stopped, causing paint to flow from the tip of the nozzle Na. will no longer be injected. In other words, the air pipe 44 has the function of a needle valve.

The nozzle body 42, the air pipe 44, the paint port 42a attached thereto, the air ports 42b, 42c, 44a, and the flange portion 44 described so far.
b, and the paint tube 37 and air tubes 43, 48, 49 connected to each port are also provided in the spray nozzle Nb other than the spray nozzle Na according to the present invention. The spray nozzle Na according to the present invention shown in FIGS. 1 and 2 is further formed with a compressed air passage B, which will be described below.

As shown in FIG. 1, an annular wall 52 is integrally connected to the outside of the nozzle body 42.
A compressed air passage B is formed between the outer peripheral surface of the annular wall 52 and the inner peripheral surface of the annular wall 52. This passage B is
As shown in FIG. 2, in cross-sectional view, it is divided into four parts by partition walls 53 whose phases differ by 90 degrees in the circumferential direction. And each aisle B ₁ ~ _{B 4}
Air tubes 54 to 57 for supplying compressed air are connected to air ports 52a to 52d provided separately. These air tubes 54 to 57 are connected to a switching valve 58 and a stop valve 5, as shown in FIG.
9 to the first air manifold 39.

As shown in FIG. 1, each of the compressed air passages B ₁ to _{B 4} is bent along the outer circumferential surface of the tapered nozzle body 42 with the opening at the tip facing inward. Air is blown out inward. Therefore, the ejected compressed air can regulate the diffusion path of the paint that has been spread in the form of a spray.

Then, by appropriately switching the supply of compressed air to each of the compressed air passages B ₁ to _{B 4} using the switching valve 58 mentioned earlier, the direction of the paint injection center, that is, the paint diffusion path is formed. The axis of the cone can be deviated from the center of the nozzle. As a result, even if there are deep joints etc. on the wall surface W to be sprayed,
Paint the prospective part of this joint using the spray nozzle Na
It is now possible to reliably and effectively reach the deepest part of the body without changing the posture at all.

This will be explained further. As shown in FIG. 6B or FIG. 7B, at the tip of the spray nozzle Na, there is a diffusion air injection hole a in the center, and around this diffusion air injection hole a there is an annular hole serving as a spraying material supply hole. The paint supply hole e is located. Furthermore, deflection air ejection holes b ₁ to b ₄ at the tips of the compressed air passages B ₁ to _{B 4} are exposed to the outer periphery of the paint supply hole e. The nozzle Na is positioned so that the partition walls 53 interposed between the deflection air ejection holes b ₁ to _{b 4} are in a horizontal position and a vertical position, respectively.

On the other hand, the switching valve 58 has two switching functions.

One of them is the state in which compressed air is supplied to the first passage B ₁ and the second passage B ₂ and the state in which compressed air is supplied to the third passage B ₃ and the fourth passage B ₄ in Fig. 2. This is to switch to the supply state. At this time, the spray state of the paint from this nozzle Na is as follows:
As shown in Figure 6A, the injection center C _s is the center of the nozzle.
The state is switched between a state where the injection path is biased to the left from C _N , that is, the injection path is indicated by L in the diagram, and a state where the injection path is biased to the right, that is, the injection diameter is indicated by R in the diagram. .

When painting the vertical joints G _v of the wall surface W, the spray nozzle Na is moved up and down reciprocally along the joints G _v , and for example, when rising, the spray path is set as indicated by L in the figure. After spraying the paint, by spraying the paint in the spray path shown by R in the figure when descending, the spray coating of each part within the joint G _v and the edge of the flat surface can be done well. It can be done.

In addition, the remaining one of the switching functions of the switching valve 58 is the first passage B 1 and the fourth passage B ₁ in FIG.
The state in which compressed air is supplied to the passageway B ₄ and the state in which compressed air is supplied to the second passageway B ₂ and the third passageway B ₃ are switched. At this time, the state of paint sprayed from this nozzle Na is such that the spray center _Cs is biased downward from the nozzle center _CN , as shown in Figure 7A, that is, the spray path is shown as D in the figure. and a state where the injection path is biased upward, that is, the injection path is indicated by V in the figure.

When painting the horizontal joint G _H part of the wall surface W, this spray nozzle N _a is moved back and forth from side to side along this joint G _H. For example, when moving to the right, the spray nozzle N a is sprayed as shown by V in the figure. After injecting in a state that becomes a path,
By spraying paint in the spray path shown by D in the diagram when moving to the left, each part within the joint G _H and the edge of the flat surface can be spray-painted well. This is possible.

In other words, no matter which joint (G _v or G _H ) is spray-painted, the direction of the paint spray center C _s is not parallel to the expected direction, and the direction of the paint spray center C s is not parallel to the expected direction. Since the paint is sprayed, the paint can be reliably delivered to the innermost part of the joint (G _v or G _H ) without changing the attitude of the spray nozzle Na. Moreover, the bottom of the cone formed by the paint injection path is inclined with respect to the flat surface, and paint is supplied almost evenly from the bottom of the joint (G _v or G _H ) to the edge of the flat surface. Therefore, there is less risk of inconveniences such as having to supply too much paint to flat surfaces in order to be able to coat the innermost parts of the joints well.

In addition, each stop valve 36, 38, 4 mentioned above
5, 47, 51, 59, 60, switching valve 50, 5
8 and the pressure regulating valve 46 are configured to be controlled by a control signal output from the control device 8 described above.

In the previous embodiment, a wall painting machine that sprays paint as a spraying material onto a wall W of a building has been described as an example. This invention can be used as a spray material in addition to paint.
It can be applied to a spray nozzle for base treatment materials such as sealer, spray finishing materials such as acrylic thinner and cement thinner, sprayed fireproof coating materials such as rock wool, and the like.

In addition, in the previous embodiment, the annular compressed air passage B is divided into four by the partition wall 53, so that the nozzle
The structure in which four deflection air ejection holes b ₁ to b ₄ are formed at the tip of Na was explained. Alternatively, the deflection air outlet b may be an opening at the tip of a compressed air passage B formed from a pipe or the like. Further, the number, arrangement, etc. of the deflection air ejection holes b can be changed as appropriate.

That is, in the previous embodiment, four deflection air outlets
The jetting of compressed air from b ₁ to _{b 4} is appropriately controlled by a switching valve 58, so that the jetting center _Cs of the paint as a spraying material is biased in all directions from the nozzle center _CN . explained. Instead of this,
The following modifications are also possible.

<1> Two deflection air jet holes b with a phase difference of 180 degrees from each other are installed around the spray material supply hole e.
It is provided integrally with the nozzle body 42, and the jetting of compressed air from these two deflection air jetting holes b is switched and controlled by a switching valve, and the nozzle body 42 is rotated 180 degrees around the nozzle center C _N. By providing a motor and combining the rotation of the nozzle body 42 by the drive of this motor with the switching control by the switching valve, the injection center C _s of the spray material can be adjusted.
deviate from the nozzle center C _N in all directions.

<2> Almost the same configuration as <1> mentioned above,
By providing a motor that rotates the nozzle body 42 by an arbitrary amount around the nozzle center C _N , the injection center C _s of the spray material can be biased in an arbitrary direction from the nozzle center C _N.

<3> Only one deflection air jet hole b is provided integrally with the nozzle body 42, and a motor for rotating the nozzle body 42 as described above around the nozzle center C _N is provided, and the nozzle body is driven by this motor. 4
By rotating 2, the injection center _Cs of the spray material can be biased in any direction from the nozzle center _CN .

<4> In <1> to <3> described above, the nozzle body 42 and the deflection air outlet b are constructed separately, and only the deflection air outlet b is moved around the nozzle center C _N by a motor. Make it rotate.

<5> Note that in <1> to <4> described above, the nozzle body 42 or the deflection air jet hole b does not necessarily have to be rotated.

Furthermore, in the previous embodiment, the diffusion air outlet a was provided inside the spray material supply hole e, and the deflection air outlet b was provided around the spray material supply hole e.
Instead, a diffusion air jet hole a is provided around the spray material supply hole e, and a deflection air jet hole b is provided further outside the diffusion air jet hole a, or a deflection air jet hole b is provided inside the spray material supply hole e. A deflection air outlet b may also be provided.

In the previous embodiment, a case was explained in which the spray nozzle Na according to the present invention is used in a wall painting machine X that automatically paints a wall surface W, but the spray nozzle Na according to the present invention can also be applied to a hand-held spray painting machine, etc. be.

[Brief explanation of the drawing]

The drawings show an embodiment of the spray nozzle according to the present invention, FIG. 1 is a longitudinal sectional view of the spray nozzle, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIG. 3 is an overall side view of the wall painting machine. Fig. 4 is a cross-sectional view of the spraying device, Fig. 5 is a schematic diagram of the compressed air piping in the spraying device, Fig. 6 A, B, and Fig. 7 A, B are schematic diagrams showing the relationship between the spray nozzle and the wall surface. In the figures, Fig. 6A is a horizontal sectional view showing the relationship between the vertical joint and the spray nozzle, Fig. 6B is a view taken along the - line in Fig. 6A, and Fig. 7
Figure A is a vertical sectional view showing the relationship between the horizontal joint and the spray nozzle, and Figure 7B is a view taken along the - line arrow in Figure 7A. a... Diffusion air outlet, b... Deflection air outlet, e... Shot material supply hole, C _S ... Center of injection of spray material, C _N ... Center of nozzle.

Claims (1)

[Scope of Claim for Utility Model Registration] A spray material supply hole e that supplies the spray material, and a diffusion air outlet a that blows out compressed air that disperses the spray material supplied from the spray material supply hole e in the form of a spray. In a spray nozzle equipped _with
A spray nozzle equipped with a deflection air outlet b that blows compressed air deflected from C _N. The spray material supply hole e is connected to the diffusion air jet hole a.
The spray nozzle according to claim 1, wherein the deflection air jet hole b is located around the spray material supply hole e. . The spray nozzle according to claim 1, wherein four deflection air ejection holes b are provided around the spray material supply hole e, with phases different by 90 degrees.