JPH04235764A - Automatic spraying device - Google Patents

Abstract

PURPOSE:To allow coaters to discontinue their operation sequentially one by one so that their cleaning is possible, without stopping a conveyor by stopping the coaters one by one to wash them, and installing an auxiliary coater moved under control to a position opposite to a product to be coated which is transported without being coated due to the suspended operation of the coaters. CONSTITUTION:Products to be coated W1 to W4 which are transported one by one continuously at a specified pitch (d) are coated using coaters T1 to T4 installed at a pitch equal to the specified pitch (d). Then the coaters are stopped one by one and washed and at the same time, an auxiliary coater To is moved under control to a position opposite to a product to be coated which is transported without being coated due to the suspended operation of the coaters. Subsequently, it is possible to suspend operation of the coaters sequentially and wash them without stopping a conveyor C. Thus poor coating or deterioration of production efficiency occurs no longer.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is designed to paint objects to be coated that are continuously conveyed at a predetermined pitch one by one using a plurality of paint machines installed at the same pitch. This invention relates to automatic painting equipment.

0002

2. Description of the Related Art For example, in the case of top coat painting for the surface of bottles, mass production is required while maintaining a certain level of coating quality. In order to perform mass production, for example, the objects to be painted, such as bottles, are conveyed continuously while being rotated, and paint is sprayed continuously by multiple paint machines installed in parallel along the conveyor. I have to.

However, according to this method, when passing in front of the coating machine, only the part facing the coating machine is coated thickly, making it impossible to coat the surrounding surface with a constant film thickness. Since paint is continuously discharged from the paint sprayer, paint is wasted. On the other hand, in order to avoid waste of paint and obtain a uniform coating film, it is possible to paint while the conveyor is stopped and the bottle is rotated, but since the conveyor must be stopped during painting, mass production become unable to process.

[0004] Conventionally, therefore, a set of multiple painting machines was used.
It is installed facing the object to be coated at a pitch equal to the conveyor pitch of the object to be coated, and by tracking the conveyor of the object to be coated, it is possible to paint while the sprayer is stopped relative to the object to be coated. I was doing it. In this way, the circumferential surface of the object to be coated can be coated uniformly without stopping the conveyor, making it possible to maintain mass production and coating quality, and at the same time, it is possible to discharge paint only during painting. There is no need to waste paint.

[0005]

[Problems to be Solved by the Invention] However, when painting continuously for a long time, the paint gradually hardens inside the paint sprayer, causing the nozzle to become clogged, resulting in changes in the paint pattern, and hardened paint being ejected. This will result in paint defects. For this reason, it is necessary to wash the coating machine and keep it in a clean state at all times before the paint hardens, but in order to clean the coating machine, the conveyor must be temporarily stopped. In particular, with quick-drying paints that have a short effective use time (so-called pot life) before curing, the line must be stopped every 2 to 3 hours, and if you want to maintain coating quality, production efficiency will decrease.

Therefore, the present invention makes it possible to clean the coating machine without stopping the conveyor while painting objects that are continuously conveyed, and to maintain a constant coating quality without reducing production efficiency. The challenge is to maintain it.

[0007]

[Means for Solving the Problem] In order to solve this problem, the present invention provides a base that is reciprocated along the traveling direction of a conveyor that continuously conveys objects to be coated at a predetermined pitch. A set of multiple coating machines is installed so as to face each object to be coated at a pitch equal to the pitch of the objects to be coated, and a set of objects to be coated simultaneously by each coating machine is opposite to each coating machine. Each time the base reaches the coating position, it tracks the object from the coating start position to the coating end position at the same speed as the conveyor and coats the object for a predetermined period of time. In an automatic coating device that is designed to repeatedly paint one set of objects to be coated, the one set of coating machines is stopped one by one for cleaning, and the one set of coating machines is placed on the base. An auxiliary coating machine that is placed before or after the coating machine and is controlled to move to a position facing the object to be coated that is not coated because the coating machine is at rest, and starts painting at the same timing as the set of coating machines. It is characterized by being provided with.

[0008]

[Operation] According to the present invention, since the set of painting machines is stopped one by one for cleaning,
For example, all paint machines are kept clean at all times by cleaning them one cycle at a time during the pot life.
No coating defects will occur. Then, the object to be coated that is transported without being coated because the coating machine is at rest is moved to a position opposite to the object to be coated by an auxiliary coating machine that is controlled to move, for example, to be followed by the above-mentioned set of coating machines. When painting a set of objects to be coated, the coating is started at the same timing as these objects, and the painting machine replaces the painting machine that is out of service and separately paints the objects to be coated. In addition, the auxiliary coating machine can be stopped and cleaned while a set of coating machines is painting, so the auxiliary coating machine can also be used in a clean state and prevent coating defects caused by paint curing, etc. It never happens.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on embodiments shown in the drawings. FIG. 1 is a flow sheet showing an automatic painting apparatus according to the present invention, and FIG. 2 is a sectional view taken along the line A--A.

1 in the figure indicates the pitch of objects W1 to W4 to be coated, such as bottles, which are rotated and conveyed by a conveyor C by a set of four coating machines from the first coating machine T1 to the fourth coating machine T4. It is a base installed to face these at a pitch equal to d, and is reciprocated on rails 2, 2 arranged parallel to the conveyor C by a feed screw 4 rotated forward and backward by a motor 3. It is made to be done.

The base 1 is moved by a conveyor from a coating start position XS to a coating end position Tracking is performed in the same direction at a speed equal to C, and at this time, each sprayer T1 to T4
Paint is sprayed from the paint to coat each of the objects W1 to W4, and at the same time as the painting is finished, it returns to the coating start position Xs and waits until the subsequent objects W1 to W4 arrive.

Each of the painting machines T1 to T4 is sequentially stopped one by one for cleaning based on a control signal from the control device 5, and this set of painting machines T1 to T4 is stopped one by one for cleaning.
An auxiliary coating machine T0 is provided downstream of T4 to coat objects that have not been coated because the coating machine is out of service.

The auxiliary coating machine T0 is installed on a pedestal 1a that reciprocates on the base 1 in parallel with the conveyor C, and the pedestal 1a moves on rails 6 and 6 disposed on the base 1. It is configured to run by a feed screw 8 which is rotated forward and backward by a motor 7. Based on the control signal from the control device 5, the auxiliary coating machine T0 is controlled to move to positions P1 to P4 facing the unpainted object, and is followed by the pair of coating machines T1 to T4. When painting the set of objects W1 to W4, they are painted at the same timing.

FIG. 2 shows the auxiliary coating machine T0, which is curved at a predetermined curvature according to the shape of the objects to be coated so that the front surfaces of the objects to be coated W1 to W4 can be uniformly coated during coating. The coating machine is moved up and down by a cylinder 10 along a rail 9, and during cleaning, the discharge port 12 is directed downward by a cylinder 11 attached to the rear of the spray machine, and the remaining paint is discharged to a waste liquid recovery port 13. ing. In addition, one set of paint machines T1 to T4 is mounted on its pedestal 1b.
It has the same configuration as the auxiliary coating machine T0, except that it is directly installed on the base 1.

The control device 5 has a conveyor C on its input side.
A speed detector 14, a photoelectric switch 15 for detecting the number of objects to be coated, a rotary encoder 16 for detecting the position of the base 1, and a rotary encoder 17 for detecting the position of the auxiliary coating machine T0 are connected. , on its output side,
A motor 3 for reciprocating the base 1 and an auxiliary coating machine T0
a motor 7 that moves the paint coating machines T0 to T4, and coating agent supply devices K0 to K4 that supply the main agent and curing agent to each of the coating machines T0 to T4.
The valve operating devices 18 are connected to each other.

The coating agent supply devices K0 to K4 are valve devices 20 and 2 that supply the main agent and curing agent to the static mixer 19 connected to the coating machines T0 to T4.
1 are connected. And each valve device 20 and 2
1 is provided with switching valves VT and VH connected to a base agent supply source BT and a curing agent supply source BH, respectively. Note that VA and VS are switching valves connected to a compressed air supply source (not shown) and a cleaning solvent supply source (not shown), respectively.

[0017]Then, each coating agent supply device K0 to K4
During painting, the switching valves VT and VH are opened, and the main agent and curing agent are mixed in the static mixer 19 and supplied to each coating machine T0 to T4, and during cleaning,
The switching valves VA and VS are alternately opened and closed to alternately supply compressed air and cleaning solvent to the paint sprayers T0 to T4.
Also, the remaining paint in the supply pipe is discharged.

The above is an example of the structure of the invention, and its operation will be explained next. First, move the base 1 to the painting start position
When the objects to be coated W1 to W4 are conveyed while waiting at S,
Based on the pulse signal from the photoelectric switch 15, the counter 22 outputs a coating object arrival signal QS to the control device 5 at a predetermined timing every time four pulse coefficients are obtained. At the same time as the object arrival signal QS is input to the control device 5, a coating start signal is output to the motor 3, and the speed V of the conveyor C detected by the speed detector 14.
The base 1 is moved from the painting start position XS toward the painting end position Xf at a speed equal to .

Next, when the base 1 reaches the painting end position Xf, the rotary encoder 16 outputs the painting end signal Qf.
is output to the control device 5, and the motor 3 is then reversed, returning to the coating start position XS and waiting before the next object arrival signal QS is output. Therefore, by painting from the painting start position XS to the painting end position Xf, the objects to be coated W1 to be continuously transported are
W4 can be made into a set of four and painted one by one.

On the other hand, from the control device 5, each paint supply device K
A stop signal is output to the valve operating devices 18 of 0 to K4 in a preset order so that the operation goes around within the effective time (so-called pot life) during which the paint can be used without curing. T0 to T4 are, for example, as shown in Fig. 3, auxiliary coating machine T0 (Fig. 3■) → first coating machine T1 (Fig. 3■) → second coating machine T2 (Fig. 3■)
)→Third coating machine T3 (Fig. 3■)→Fourth coating machine T4 (Fig. 3■)
0 to T4 are cleaned. Therefore, each coating machine T0
~T4 is cleaned at predetermined intervals and is always used in a clean state, so there is no possibility of nozzle clogging or coating defects due to ejection of hardened paint lumps.

In this case, for example, when the coating machine T1 that is moved while facing the object to be coated W1 comes to rest (
3), this object W1 to be coated is transported without being coated. Therefore, the auxiliary coating machine T0 is controlled to move to a position P1 facing the object to be coated W1 that is being transported without being coated, so that the set of coating machines T1 to T4 can coat the following set of objects to be coated. When painting, by starting painting at the same timing, the object W1 to be coated will be coated by the auxiliary coating machine T0 instead of the coating machine T1.

[0022]Then, the first coating machine T1 has been cleaned.
When cleaning is performed by starting the operation of the second coating machine T2 and stopping the second coating machine T2 (Fig. 3■ to ■), first, as shown in Fig. 4t1, the first coating machine T1, which has been inactive until now, is started. At the same time, the second coating machine T2, which had been in operation until now,
will be suspended. At this time, the auxiliary coating machine T0 is painting the object W1 that was not coated by the idle first coating machine T1 at the position P1, but when the coating of this object W1 is finished, it is as shown in t2 to t3 in Fig. 4. , the corresponding position P of the object W2 that is not coated by the second coating machine T2
2, and the object to be coated W2 is coated at that position.

In this way, even if the coating machines T1 to T4 are sequentially stopped for cleaning, the objects to be coated W1 to W4 that have not been coated by the stopped coating machines remain at the predetermined position P1.
Since the coating is carried out by the auxiliary coating machine T0 whose movement is controlled from time to time to P4, each of the coating machines T1 to T4 can be sequentially cleaned without stopping the conveyor C. Therefore, it is possible to maintain each coating machine T1 to T4 in a clean state and continuously coat the objects to be coated W1 to W4, and it is possible to maintain a constant coating quality.
Since it is not necessary to stop the conveyor C, production efficiency can be improved.

In addition, in the description of the embodiment, the auxiliary coating machine T0
has been described with reference to a case in which the coating machines T1 to T4 are provided on the latter side of a set of coating machines T1 to T4, but the present invention is not limited to this. It may be provided on the upstream side of the coating machines T1 to T4. Furthermore, it goes without saying that the present invention can be applied not only to the case where a two-component mixed type paint is used but also to the case where a normal paint is used.

[0025]

As described above, according to the present invention, a plurality of painting machines are sequentially stopped and cleaned one by one, and objects to be coated that are not painted by the stopped painting machines are cleaned.
Since the auxiliary coating machine is designed to replace the inactive coating machine, it is possible to clean the coating machine without stopping the conveyor while painting objects that are continuously conveyed. It has the excellent effect of maintaining a constant coating quality without reducing production efficiency.

[Brief explanation of the drawing]

[Fig. 1] Flow sheet showing an automatic painting device according to the present invention

[Figure 2] Cross-sectional view along line A-A

[Figure 3] Graph showing the painting order of each painting machine

[Figure 4]
Graph showing the operating status of the coating machine when transitioning from painting to rest

[Explanation of symbols]

1...Base T1 to T4...Painting machine T0...Auxiliary coating machine W1 to W4...Objects to be coated P1 to P4...Opposing objects to be coated that are not to be painted Position XS ...Painting start position Xf ...Painting end position

Claims (1)

[Claims] Claim 1: A base (1) that is reciprocally moved along the traveling direction of a conveyor (C) that continuously conveys objects to be coated (W1 to W4) at a predetermined pitch (d) is provided with a plurality of conveyors. A set of coating machines (T1 to T4)
-W4) are installed so as to face each object to be coated (W1 to W4) at a pitch (d) equal to the pitch of
Each time a set of objects (W1 to W4) to be coated simultaneously by each of the coating machines (T1 to T4) arrives at a position facing each of the coating machines (T1 to T4),
While tracking the base (1) from the coating start position (XS) to the coating end position (Xf) at the same speed as the conveyor (C), the object to be coated (W1~
At the same time as coating W4), it returns to the coating start position (XS) at the same time as the painting is completed, and paints the subsequent objects to be coated (W1 to
W4) in an automatic coating device that is configured to repeatedly coat one set of coaters (T1 to T1).
The paint sprayers (T4) are stopped one by one for cleaning, and the set of paint sprayers (T1 to T4) are placed on the base (1).
There is a position (P1 to P4) at the front or rear stage of T4) that faces the object to be coated that is not coated because the coating machine is out of service.
), the set of painting machines (T1 to T4
), the auxiliary coating machine starts painting at the same timing as (
An automatic painting device characterized in that it is provided with a T0).