JPH06134376A - Device and method for liquid coating - Google Patents

Abstract

PURPOSE:To provide a liquid coating device enabling to coat smoothly, even in the case that powder, etc., are mixed in a coating liquid, and a liquid coating method. CONSTITUTION:An object 2 is held by a holding means 20 and a liquid 1 is sucked by a pump 40 from a stirring type tank 30 being arranged proximately and is ejected while the pump 40 is moved along a surface of the object 2 by a moving means 50. The movement of the pump 40 and the ejection are synchronized by a control means 60 and the coating is executed. Thus uniform coating is given on the object 2 and also because the times of agitation at the storing time and suction by the pump or ejection are short, change in the component is restrained, even in the case that powder, etc., are mixed in the coating liquid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid coating device and a liquid coating method, and can be used for the work of precisely coating various liquids on the surface of an object to be coated.

[0002]

2. Description of the Related Art Conventionally, in addition to surface coating and the like, various liquids have been conventionally applied to various places according to functional requirements. For example, a lubricant is applied to the sliding parts of the machine in order to improve slidability, and in molding a synthetic resin or the like, a mold release agent may be applied to the inner surface of the mold cavity prior to molding. It is being appreciated.

In applying such various liquids,
In order to increase the efficiency of the coating work, automation using mechanical devices is performed. For example, a coating robot has been introduced into a production line of various products, and an apparatus for spray-applying a release agent into a cavity of a molding die has been introduced in a resin molding apparatus.

[0004]

By the way, as the above-mentioned coating liquid, a pigment for coloring, a metal powder for metallic coating, a powder having various functions such as a lubricating action and a peeling action, etc. are contained in the liquid. There is a mixture. These mixed components are in a state in which fine particles are suspended in the liquid, except when they are completely dissolved in the solvent.

Therefore, there is a problem in that the particle components mixed in the liquid are likely to be non-uniformly dispersed in the liquid, and it is difficult to apply the particles to the surface of the object to be applied uniformly. In particular,
Even if a liquid is prepared by mixing the components in a predetermined ratio in advance, the mixed particles will settle during storage due to the influence of gravity, etc., and the mixing ratio will change during application. There is.

In addition, it may be difficult to disperse the powder particles in the liquid during mixing, and if there is a lump of the powder particles that are not sufficiently dispersed, the flow path of the coating device may be clogged. There is. These problems have been a cause of great trouble in an apparatus that performs precise coating work.

An object of the present invention is to provide a liquid coating apparatus and a liquid coating method which can perform a smooth coating operation even when powder or the like is mixed in the coating liquid.

[0008]

SUMMARY OF THE INVENTION An apparatus of the present invention is a liquid application apparatus for applying a predetermined liquid to the surface of an object, and a holding means for holding the object and a proximity means to the holding means. A tank that is arranged to store the liquid while stirring, a pump that sucks out a predetermined amount of the liquid from the tank and discharges the liquid at a predetermined speed, and a pump that is used for the object held by the holding means And moving means for relatively moving at a predetermined speed, and control means for adjusting the moving speed of the moving means and the discharge speed of the pump to a constant ratio.

Further, the above-mentioned apparatus is characterized in that it has a space maintaining means for maintaining a constant distance between the tip of the nozzle of the pump and the surface of the object. Further, the tank is a sealed container, a nozzle insertion port into which the suction nozzle of the pump can be inserted, a seal member for sealing a gap between the nozzle insertion port and the nozzle inserted therein, and the nozzle insertion And a valve body capable of being pushed open by inserting the nozzle. Further, the pump is capable of discharging a gas of the same volume as the suction amount when sucking the liquid,
The tank has a nozzle insertion port for pressure compensation into which gas discharged from the pump is introduced.

On the other hand, the method of the present invention is a liquid application method in which a liquid is applied to an object by using the above-mentioned apparatus, and a surfactant is mixed in the liquid in the tank before the application. Is characterized by.

[0011]

[Operation] In the present invention as described above, the moving means moves the pump to the vicinity of the tank, sucks the liquid to be applied from the tank, and then moves the pump to the vicinity of the object held by the holding means. Then, by moving the pump along the surface of the object, the previously sucked liquid is discharged to apply the liquid to the surface of the object. At this time, the control means makes the discharge speed of the pump and the moving speed of the pump by the moving means correspond to a constant ratio, so that the liquid applied to the surface of the object is made uniform and precise application becomes possible. Become. In particular, by providing the spacing holding means, the distance of the nozzle to the object can be made constant, and the coating state can be made more uniform.

By stirring the liquid stored in the tank, the mixed state of the liquid can be made uniform, and
Since the tank is placed close to the object, no sedimentation or the like will occur during transfer by the pump. Therefore, even if the liquid is a mixture of fine powder or the like, there is no problem such as a change in the component ratio.

By sealing the tank and shutting the inside and outside with the valve body and the sealing member, it is possible to prevent external dust and the like from mixing with the liquid in the tank, and to prevent the aging component when the liquid contains a volatile component. It is possible to prevent changes and the like. Further, by performing the pressure compensating operation in the tank by utilizing the sucking operation of the pump, it is possible to prevent deterioration of the liquid sucking property from the tank when sealed.

Further, by mixing a surfactant in the liquid in the tank, even when a liquid containing fine powder is used, the powder is not sufficiently mixed, or the liquid is mixed in the pump or the like. It becomes possible to avoid problems such as clogging. The present invention intends to achieve the above-mentioned object as described above.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, a liquid application device 10 of the present embodiment is a device for automating the work of precisely applying a volatile liquid 1 mixed with a fine powdery lubricant to the surface of a flat long object 2. The box-shaped case 11 is provided with various components for performing automatic precision coating.

In the case 11, a holding means 20 for holding the object 2, a tank 30 arranged near the holding means 20 for storing the liquid 1 while stirring, and a predetermined amount of the liquid 1 from the tank 30 are stored. A pump 40 that sucks out the liquid 1 and discharges the liquid 1 at a predetermined speed, and a moving means 50 that relatively moves the pump 40 at a predetermined speed with respect to the object 2 held by the holding means 20.
And a control means 60 for adjusting the moving speed of the moving means 50 and the discharge speed of the pump 40 at a constant ratio.

The case 11 has a work table 13 on the upper surface of the base portion 12, the work table 13 is open on the front surface side, and is surrounded by shield plates 14 on both sides and the back surface. Shield 14
Is transparent, and the state on the workbench 13 can be visually recognized from the outside.

The base 12 is provided with control means 60 on a shelf-like portion formed on the front surface thereof. Then, the power supply from the control means 60 and wiring (not shown) for control and the like are connected to the pump 40 and the moving means 50 on the workbench 13 through the inside of the base 12. A moving unit 50 is installed on the back side of the work table 13, and the pump 40 is supported by the moving unit 50. Further, a tank 30 is arranged on the front side and a holding means 20 is arranged on the rear side thereof in substantially the center of the workbench 13.

The moving means 50, as shown in FIG.
A robot arm having axis-moving mechanisms 51, 52 and 53 for Y-axis and Z-axis, each of which is an appropriate linear driving means (not shown) such as an existing ball screw feeding mechanism, linear motor, fluid cylinder, etc. With this, it is possible to move with high accuracy in each axial direction.

The X-axis moving mechanism 51 is arranged on the back side of the workbench 13 in the front direction, and the Y-axis moving mechanism 52 is supported by the X-axis moving mechanism 51 and extends to the front side of the workbench 13. Z-axis movement mechanism 53
Is supported by the Y-axis moving mechanism 52 and supports the pump 40. Such moving means 50 performs three-axis movement under the control of the control means 60, whereby the pump 40 is three-dimensionally moved to the arbitrary height of the arbitrary plane position of the work table 13.

As shown in FIGS. 2, 3, and 4, the pump 40 includes a cylinder mechanism portion 42 at the lower end side of a box-shaped case 41, and drives the cylinder mechanism portion 42 in the case 41. The drive mechanism unit 43 is provided.

The drive mechanism section 43 has a high-precision motor 431 such as a stepping motor on the upper end side, and its main shaft is connected to the upper end of a rotary shaft 434 continuing in the moving member 433 via a universal joint 432. . The moving member 433 is movably supported by the guide bar 435 fixed to the case 41 in the direction of the rotating shaft 434, and is engaged with the lower end side of the rotating shaft 434 via the ball screw mechanism 436.
It is adapted to move up and down in the case 41 as it rotates.

A rotation detector 437 such as a rotary encoder is installed on the moving member 433, and the rotation detector 437 and the motor 431 are connected to the control means 60.
Controls the motor 431 based on the output of the rotation detector 437 so that the rotation angle of the rotary shaft 434 becomes a predetermined amount, whereby the moving member 433 can be advanced and retracted with high accuracy.

The cylinder mechanism section 42 has a main cylinder 421 and an auxiliary cylinder 422, each of which has a main piston 42.
3 and auxiliary piston 434 are contained. The main piston 423 and the auxiliary piston 434 are integrally formed with the moving member 43.
It is connected to the lower end of 3 and is moved in each cylinder 421, 422 as the moving member 433 moves.

A main nozzle 44 is connected to the lower end of the main cylinder 421, and the main piston 423 moves in the main cylinder 421, so that the main cylinder 421 passes through the main nozzle 44.
Liquid 1 is sucked into and discharged from the device. Inside the auxiliary cylinder 422, an upper side of the auxiliary piston 434 is a pressure compensating cylinder chamber 425, and a lower side thereof is a main piston cleaning cylinder chamber 426.

First and second ports 427, 4 communicating with the pressure compensating cylinder chamber 425 are provided on both sides of the upper end of the auxiliary cylinder 422.
28 are formed. The first port 427 is open to the atmosphere via the check valve 71 and the air filter 72. The second port 428 is connected to the auxiliary nozzle 45 via the check valve 73. The auxiliary nozzle 45 is held by a clamp 46 so as to be parallel to the main nozzle 44 and have its tip higher than the main nozzle 44.

When the auxiliary piston 424 moves downward in the auxiliary cylinder 422 into the pressure compensating cylinder chamber 425, the clean air filtered by the air filter 72 is sucked through the check valve 71, and the auxiliary piston 424 is By moving downward, check valve 73 and auxiliary nozzle 45
Through it, the clean outside air that has been sucked in first is discharged. The effective area of the auxiliary piston 424 is equal to the effective area of the main piston 424, and the volume of the liquid 1 discharged from the auxiliary nozzle 45 and the volume of the air discharged from the auxiliary nozzle 45 when each of them operates. , Are set to be substantially equal to each other. The pressure compensating means 70 is constituted by the pressure compensating cylinder chamber 425, the auxiliary nozzle 45, the air filter 72, and the like, and the portion of the tank 20 into which the auxiliary nozzle 45 is inserted, which will be described later.

Third and fourth ports 429, 420 communicating with the cleaning cylinder chamber 426 are formed on both sides of the lower end of the auxiliary cylinder 422. The third port 429 is connected via a check valve 81 to a supply tank 82 that stores a clean cleaning liquid. This cleaning liquid is of the same type as the liquid 1 used for coating or its solvent. The fourth port 420 is connected via a check valve 83 to a recovery tank 84 for recovering the used cleaning liquid.

An auxiliary piston is provided in the cleaning cylinder chamber 426.
The cleaning liquid from the supply tank 82 is sucked through the check valve 81 as the auxiliary cylinder 422 moves downward in the auxiliary cylinder 422, and the cleaning liquid previously sucked through the check valve 83 is recovered as the auxiliary piston 424 moves downward. It is designed to be discharged to the tank 84. These cleaning cylinder chamber 426 and each tank 82, 84,
Cleaning means 80 is configured.

The tank 30 is, as shown in FIG.
It has a box-shaped closed container 31 installed at a predetermined position, and the liquid 1 for application is stored therein. Container 31
It is mounted and held on an existing stirring vibrating device 32 fixed to the workbench 13, and by vibrating by this vibrating device 32, the liquid 1 inside is constantly stirred.

As shown in FIGS. 5 and 6, two nozzle insertion ports 33 and 34 are formed on the upper surface of the container 31. Each of the nozzle insertion ports 33, 34 has an interval and an opening diameter into which the main nozzle 44 and the auxiliary nozzle 45 of the pump 40 can be inserted,
Each has a passage 35 extending into the interior of the container 31.

An O-ring-shaped seal member 36 which can be brought into close contact with the outer circumferences of the inserted main nozzle 44 and auxiliary nozzle 45 is arranged in the middle of each passage 35. Further, a valve body 37 that can be opened and closed is installed at the lower end of each passage 35. Each valve 37
Has one end rotatably supported on the outer periphery of the passage 35 and is urged by a spiral spring 38 wound around a pin of a rotating shaft. Normally, the lower end opening surface of the passage 35 is closed as shown in FIG. However, when the main nozzle 44 and the auxiliary nozzle 45 are inserted as shown in FIG. 6, they are pushed open by these.

The holding means 20 includes a tank 30 on the workbench 13.
Target 2 that is installed close to the back of the
The object 2 is fixedly and detachably held by using an existing appropriate method such as tightening or suction.

As shown in FIGS. 2, 3 and 7, the control means 60 is connected to the motor 431 and the rotation detector 437 of the pump 40 to control the sucking and discharging operations of the pump 40 and to move the pump 40. It is connected to the means 50 and controls the movement or positioning operation of the pump 40 by the respective axis moving mechanisms 51 to 53. For this purpose, the control means 60 includes a liquid amount control unit 61, a position control unit 62, a cooperation control unit 63, and a setting unit 64. These are realized by an existing microcomputer configured by software, dedicated hardware, or the like.

The liquid volume control unit 61 is an existing pump control means commonly used for a pump or the like which requires a precise operation. Specifically, the amount of retreat and advance of the main piston 423 and the like of the pump 40 is calculated from the output signal of the rotation detector 437, and the amount of suction and the amount of discharge from the main nozzle 44 are calculated from this value. Then, the motor 431 is operated according to the given suction speed, discharge speed, total suction amount, etc.
Controls to perform a predetermined operation.

The position control section 62 is an existing three-axis control means commonly used for a three-dimensionally moving mobile robot or the like. Specifically, X toward the given X, Y, Z coordinate position.
Each axis moving mechanism of the axis, the Y axis, and the Z axis is individually controlled and moved, thereby moving the pump 40 to an arbitrary position on the workbench 13.

The cooperative control section 63 commands the liquid volume control section 61 to perform suction and discharge operations based on the contents and conditions of the coating operation set in the setting section 64, and the position control section 62.
To command the movement. Here, in the cooperative control unit 63, as main cooperative operations, an operation of applying the liquid 1 to the object 2 and an operation of sucking the liquid 1 are programmed.

In applying the liquid 1 to the object 2, the tip of the main nozzle 44 of the pump 40 is positioned at the application start position of the object 2 and the tip opening surface of the main nozzle 44 of the pump 40 is applied. While maintaining a predetermined distance from the surface of the object 2, the pump 40 is moved along the surface at a predetermined speed to the coating end position, and during this movement, a pump 40 is provided so as to have a predetermined discharge speed according to the moving speed. Is operated to discharge the liquid 1 from the main nozzle 44. liquid
The main nozzle 44 of the pump 40
And each tip of the auxiliary nozzle 45 to the nozzle insertion port of the tank 30.
Position it above 33, 34 and lower the pump 40 to insert each tip into the tank 30 from each insertion port 33, 34.
After the tip of 44 is lowered to a height at which it is immersed in the liquid 1 in the tank 30, the pump 40 is caused to perform a suction operation to suck the liquid 1.

The setting unit 64 includes the contents of the coating operation such as the coating thickness, the coating position, the coating speed, etc. which the cooperative control unit 63 should refer to, the position of the tank 30 containing the liquid 1, the target 2 on the holding means 20.
The shape, position, etc. of the are set and stored, and these settings are externally set by operating various buttons while referring to the display on the front panel shown in FIG.

In this embodiment, the coating operation using the liquid coating device 10 is performed in the following procedure. First, a predetermined fine powdery lubricant is mixed with a volatile liquid to prepare a liquid 1, which is then stored in the tank 30. At this time, the liquid 1 is blended with an appropriate surfactant having a surfactant effect. In this state, the nozzle insertion port 33 of the tank 30,
34 is closed by the valve body 37, the inside of the tank 30 is in a sealed state,
Volatilization of liquid 1 is suppressed. Further, the tank 30 is constantly vibrated and agitated by the vibrating device 32, and the contained liquid 1 is always maintained in a predetermined uniform mixed state.

Next, the predetermined object 2 is set in the holding means 20, and the data such as the object 2 and the liquid 1 and the conditions such as the desired coating thickness are set in the control means 60. When the control means 60 is started in this state, the automatic coating operation by the liquid coating device 10 is performed.

First, the control means 60 activates the pump 40 and the moving means 50 by the cooperative control means 63 to execute the operation of sucking the liquid 1. As a result, the liquid 1 in the tank 30 is sucked into the main cylinder 421 from the main nozzle 44 by a predetermined amount. At this time, by the pressure compensating means 70 of the pump 40, the air having the same volume as the liquid 1 sucked out from the main nozzle 44 is pressure-fed from the auxiliary nozzle 45 into the tank 30, and the sealed tank 30.
Unnecessary decompression inside is prevented. Further, the peripheral surface of the main piston 423, which has risen in association with the suction operation, is cleaned by the cleaning means 80.

Subsequently, the control means 60 activates the pump 40 and the moving means 50 by the cooperative control means 63 to execute the operation of applying the liquid 1 to the object 2. As a result, the liquid 1 in the main cylinder 421 is discharged from the main nozzle 44 onto the surface of the object 2 at a predetermined speed, and a uniform coating film of the liquid 1 having a predetermined thickness is formed on the surface of the object 2. Here, if the coating portion of the object 2 is linear, only one transfer coating is performed, but if it is wide, the same transfer coating is repeated.

According to this embodiment, the following effects can be obtained. That is, the pump 40 is controlled by the control means 60.
Further, since the moving means 50 is operated to apply the liquid 1 sucked out from the tank 30 to the object 2 on the holding means 20 arranged in the vicinity, the precision application work of the liquid can be automatically performed. Further, in the coating operation, since the discharge speed of the pump 40 and the moving speed of the pump 40 by the moving means 50 are synchronized by the cooperative control section 63 of the control means 60, a constant coating thickness can be obtained easily and reliably. . In addition, since a suitable amount of liquid is pumped and discharged by the pump 40 during application, the components of liquid 1 settle while the suspension is stopped midway along the path, such as when sending liquid 1 through a long and narrow pipeline. Inconveniences such as doing can be solved.

Further, by constantly stirring the tank 30 which stores the liquid 1, it is possible to prevent fluctuations such as precipitation of the powder component of the liquid 1 in the tank 30 and to bring the tank 30 and the holding means 20 close to each other. By arranging them, it is possible to prevent fluctuations when transferring with the pump 40. By mixing a surfactant in the liquid 1, it is possible to improve the mixing state of the powder component in the liquid 1 and the narrow flow path portion when sucked into the pump 40. It is possible to prevent inconveniences such as the accumulation of powder on the surface and clogging, and a smooth coating operation can be reliably performed.

Further, since the tank 30 is constantly sealed by the valve element 37 and the like, the disadvantages such as the inclusion of impurities in the liquid 1 and the inconvenience that the volatile components in the liquid 1 are diffused are obviated. It can be avoided. The pump 40 is provided with the cleaning means 80 to clean the peripheral surface of the main piston 423 drawn out from the main cylinder 421 in association with the suction, so that the cleanliness of the sucked and discharged liquid 1 can be improved. it can. Further, the pump 40 is provided with the pressure compensating means 70, and by pumping and supplying the same volume of clean air to the tank 30 when sucking out the liquid 1, the pressure in the sealed tank 30 can be always kept constant. Therefore, it is possible to avoid the inconvenience that the inside of the tank 30 is decompressed when the sucked amount is accumulated and the liquid 1 is hard to suck.

Here, the pressure compensation means 70 and the cleaning means 80
Is an auxiliary cylinder 42 configured integrally with the main cylinder 421 and the main piston 423 in the cylinder mechanism portion 42 of the pump 40.
2 and the auxiliary piston 424, the structure of the pump 40 can be simplified. In particular,
Together with these integrated operations, by setting the effective areas of the auxiliary cylinder 422 and auxiliary piston 424 to be the same as the effective areas of the main cylinder 421 and main piston 423, the same volume as the liquid 1 sucked out as the pressure compensating means 70 is set. Since the air can be sent out, it is possible to omit additional adjustments.

Next, another embodiment of the present invention will be described with reference to FIGS.
It will be explained using 11. This embodiment basically has the same structure as the embodiment described with reference to FIGS. 1 to 7,
The method of supporting the nozzle portion of the pump 40 and the object 2 of the holding means 20 is different. Therefore, the same parts as those of the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted, and different parts will be described below.

In FIGS. 8 and 9, the pump 40 of this embodiment is provided with a main nozzle 100 at the tip which is thicker than the main nozzle 44 of the above embodiment and also serves as a main cylinder 421. And
A roller-type distance maintaining means 110 for maintaining a distance between the main nozzle 100 and the object 2 is formed on the front end opening side.

As shown in FIG. 10, the spacing maintaining means 110 is a receiving portion 111 formed on both sides of the base of the main nozzle 100.
A support member 112 that is screwed to the receiving portion 111 so that the position of the main nozzle 100 can be adjusted along the longitudinal direction of the main nozzle 100;
And a roller 113 that is rotatably supported by 2 and is arranged on both sides of the tip of the main nozzle 100.

The rollers 113 have their respective rotation centers on the same axis, and the axes are held at positions intersecting the center axis of the main nozzle 100. Further, the roller 113 is adjusted so that the lower peripheral surface thereof projects from the tip opening surface of the main nozzle 100 by a predetermined distance according to the coating thickness of the liquid 1.

On the other hand, in the holding means 120 of this embodiment, as shown in FIG. 11, the supporting portion of the object 2 is a thick cushion material 121 such as foamed plastic having elasticity and flexibility. The object 2 placed on the slab is appropriately sunk into the cushion material 121 by pushing the surface.

In this embodiment, as shown in FIG. 11, the object 2 is placed on the cushion material 121, and the main nozzle 100 of the pump 40 is applied to the object when applying.
The lower surface of the roller 11 of the space holding means 110
Press 3 onto the surface of object 2. In this state, the pump
When 40 is moved horizontally, the roller 113 of the space holding means 110 is
Rolls along the surface of the object 2 and maintains a constant distance between the tip opening surface of the main nozzle 100 and the surface of the object 2.

In particular, even if the object 2 has irregularities, the object 2 pushed by the horizontally moving roller 113 sinks into the cushion material 121, and the tip opening surface of the main nozzle 100 and the object are also removed. Keep the distance from the surface of 2 constant.
Therefore, if the liquid 1 is discharged from the main nozzle 100 in accordance with the movement of the pump 40, the liquid 1 will be applied to the surface of the object 2 with a constant thickness.

According to this embodiment as described above, the space between the tip opening surface of the main nozzle 100 and the surface of the object 2 can be maintained constant by the space holding means 100, and the coating thickness of the liquid 1 can be kept constant. More uniform. In particular, since the space holding means 100 holds the mechanical space by the rollers 113, the structure is simple and the operation is reliable, and even if the object 2 has irregularities, it is easy to hold a fixed space.

Since the object 2 is floatingly supported by the cushion material 121, if the pump 40 is moved horizontally, the object 2 is pushed by the roller 113 according to the unevenness of the surface and moves up and down, and the above-mentioned constant The spacing will be maintained. For this reason, complicated control such as moving the pump 40 according to the unevenness of the surface of the object 2 becomes unnecessary, and the object 2
The coating operation can be extremely facilitated when the surface of the is uneven.

The present invention is not limited to the above-mentioned embodiments, and the following modifications and the like are also included in the present invention. With respect to the drive mechanism section 43 of the pump 40, the types and performances of the motor 431, the rotation detector 437, and the ball screw mechanism 436 may be selected as appropriate, and the arrangement in the case 41 may be appropriately designed for implementation.

In particular, the rotational drive by the motor 431 is not limited to reciprocating movement by the ball screw mechanism 436 or the like, and a linear motor or the like and linear position detection may be combined.
Then, not only the feedback control for detecting the current position but also the moving position detection may be omitted and the open loop control may be performed.

With respect to the cylinder mechanism portion 42 of the pump 40, the auxiliary cylinder 422 may be used for other purposes other than the pressure compensating means 70 and the cleaning means 80. If these are not used, the auxiliary cylinder 422 may be omitted. , Only the main cylinder 421 need be provided. Here, the pressure compensating means 70 is not limited to the configuration of the above embodiment, but may include other arrangements or other elements. For example, when sucking out liquid 1, the auxiliary nozzle 45
It is not limited to the one connected to the tank 30 by the above, and may be one directly connected to the tank 30 at all times by a long flexible tube.

For the pressure compensating means 70, the auxiliary cylinder
Not limited to the one using 422, another pump device or the like which is controlled in synchronization with the suction of the liquid 1 by the control means 60 may be used. The pressure compensating means 70 may be omitted when the pressure reduction due to suction in the tank 30 is not a problem, such as when the tank 30 is not of a closed type.

The cleaning means 80 is not limited to the configuration of the above embodiment, but may include other arrangements or other elements. Further, the main cylinder 423 is not limited to the one using the auxiliary cylinder 422, but may be another pump means or the like.
If it is not necessary to wash, it may be omitted as appropriate.

Regarding the tank 30, the material, dimensions, etc. of the container 31 may be arbitrarily designed, and other shapes may be used.
In addition, if the volatilization of the liquid 1 and the mixing of foreign matter do not pose a problem, the container 31 does not have to be a closed type. Furthermore, the shape of the nozzle insertion ports 33, 34 may be selected as appropriate, and the valve body 37
Similarly, the type of the seal member 36 and the like can be changed.

If the container 31 is not of a closed type,
The valve element 37, the seal member 36, etc. may be omitted as appropriate. Further, the means for stirring the liquid 1 inside the tank 30 is not limited to the vibrating device 32, and may be a means such as a motor driven impeller for stirring.

With respect to the moving means 50, it is sufficient to appropriately select the respective operating mechanisms in the X, Y and Z axis moving mechanisms 51 to 53, and an electromagnetic drive source such as a motor and a ball screw system or a linear motor system. Other than the above, the one using a fluid cylinder or the like may be used. Also, X,
The arrangement, movement range, direction, etc. of the Y- and Z-axis moving mechanisms 51 to 53 are arbitrary. For example, with respect to the Z-axis, a solenoid or the like may be used to move between two upper and lower positions. The X-axis movement may be omitted as long as it is sufficiently separated from the holding means 20 and the tank 30.

With respect to the control means 60, the constituent hardware and software may be set arbitrarily, and each control unit 61
Up to 63 detailed processing methods and contents may be selected for implementation. The format and the like of the setting unit 64 are also the same, and the data format and contents to be set and used by these may similarly be appropriately selected.

Regarding the holding means 20, the method of holding the object 2 and the supporting structure may be appropriately selected upon implementation, and may have height position adjustment or the like. Interval holding means 11
Regarding 0, it is not limited to the configuration using the roller 113 as in the other embodiments described above, and it may be such that a sled-shaped sliding rail or the like is slidably brought into contact with the surface of the proponent 2 to maintain the interval. . Further, not only the mechanical spacing is maintained, but the configuration may be such that the shape of the object 2 is measured and the spacing between the nozzle portion of the pump 40 and the surface of the object 2 is maintained by controlling the moving means 50. Good.

The object 2 to be applied to the liquid application device 10 is arbitrary, and the type and property of the liquid 1 are also arbitrary.
For example, the liquid 1 is not limited to a mixture of powder and a volatile liquid, and may be a solvent dissolved in a solvent. Alternatively, it may be applied to the application of general coloring paint.

[0068]

As described above, according to the present invention,
The liquid is sucked from the tank located close to the target object and discharged while moving along the surface of the target object, so that the surface of the target object can be evenly coated and powder etc. Even when they are mixed, it is possible to prevent the components from changing, and it is possible to perform a smooth coating operation.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view showing a main part of the embodiment.

FIG. 3 is a front sectional view showing the pump of the embodiment.

FIG. 4 is a side sectional view showing the pump of the embodiment.

FIG. 5 is a cross-sectional view showing the main parts of the tank of the above embodiment.

FIG. 6 is a sectional view showing a nozzle insertion state of the embodiment.

FIG. 7 is a block diagram showing control means of the embodiment.

FIG. 8 is a sectional view showing a nozzle tip according to another embodiment of the present invention.

FIG. 9 is a bottom view showing a tip of a nozzle according to another embodiment.

FIG. 10 is an exploded perspective view showing a gap holding unit of the other embodiment.

FIG. 11 is a perspective view showing a coating operation state of the other embodiment.

[Explanation of symbols]

 1 Liquid 2 Object 10 Liquid coating device 20 Holding means 30 Tank 32 Vibrating device for stirring 36 Sealing member 37 Valve body 40 Pump 42 Cylinder mechanism 43 Drive mechanism 44 Main nozzle 45 Auxiliary nozzle 50 Transfer means 60 Control means 70 Pressure Compensation means 80 Cleaning means 100 Main nozzle 110 Interval holding means

Claims (5)

[Claims] 1. A liquid application device for applying a predetermined liquid to the surface of an object, comprising: holding means for holding the object; and a storage means which is disposed in the vicinity of the holding means while stirring the liquid. A tank, a pump that sucks out a predetermined amount of the liquid from the tank and discharges the liquid at a predetermined speed, and a moving unit that relatively moves the pump at a predetermined speed with respect to the object held by the holding unit. A liquid application apparatus comprising: a control unit that adjusts a moving speed of the moving unit and a discharge speed of the pump at a constant ratio. 2. The liquid applying apparatus according to claim 1, further comprising a space maintaining unit that maintains a constant distance between the tip of the nozzle of the pump and the surface of the object. Liquid coating device. 3. The liquid application apparatus according to claim 1 or 2, wherein the tank is a sealed container, and a nozzle insertion port into which a suction nozzle of the pump can be inserted, and the nozzle insertion port. And a seal member for sealing a gap between the nozzle and the nozzle inserted therein, and a valve body that closes the nozzle insertion port and can be pushed open by inserting the nozzle. 4. The liquid application apparatus according to claim 1, wherein the pump is capable of discharging a gas having the same volume as the suction amount when sucking the liquid, The liquid application apparatus, wherein the tank has a nozzle insertion port for pressure compensation into which the gas discharged from the pump is introduced. 5. A liquid application method for applying a liquid to an object using the liquid application device according to any one of claims 1 to 4, wherein the liquid in the tank is applied prior to the application. A liquid application method, which comprises mixing a surfactant.