JPS6231616B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coating device for cement mortar molded products.

[Conventional technology]

Painting of conventional cement mortar press molded products was not sufficient.

Japanese Utility Model Application Publication No. 52,273/1983 discloses a method in which the efficiency of coating is measured by synchronizing the movement of molded articles with the operation of a paint injection valve device of a coating apparatus during conveyance. However, this device cannot be used for cement mortar molded products that must be placed on a support plate and handled without vibration until solidified after molding.

[Problem that the invention seeks to solve]

Therefore, the object of the present invention is to provide a coating device with a simple structure that can apply coating to a molded product immediately after molding and then send the molded product to a curing room.

[Means for solving problems]

In order to achieve the above object, the present invention provides at least one
a molded product pedestal, at least one corresponding paint gun disposed above the pedestal, and a cleaning device;
It consists of a plurality of transport arms that move between adjacent locations of both conveyors and the cradle, and a progressive transport mechanism that supports and drives the transport arms, and the transport mechanism moves a horizontal guide shaft that moves a plurality of vertical guide shafts. A plurality of vertical guide shafts moving a horizontal guide shaft are interconnected and driven by an air cylinder, and a plurality of conveying arms moving the vertical guide shafts are interconnected. It is an object of the present invention to provide such a coating device, characterized in that the coating device is driven by a combination of lifting and lowering air cylinders.

〔effect〕

With the above configuration, it was possible to provide a coating device that uniformly coats cement mortar molded products immediately after molding with an extremely simple mechanism, and that can be delivered to a curing area after painting. It is.

〔Example〕

BRIEF DESCRIPTION OF THE DRAWINGS The features of the invention will be explained in more detail below with reference to the accompanying drawings, which illustrate one embodiment of the invention.

1 and 2 show an automatic cement mortar molded product device 1 and a painting station 2 connected thereto. The automatic cement mortar molded product can be molded, and the molded product manufacturing apparatus shown in, for example, Patent No. 984943 (Japanese Patent Publication No. 54-20209) can be used. 7 is a steam/water separator connected to the vacuum suction type water squeezing device of the above patent. The molded product 8 transferred from the molding machine to the first conveyor 6 is sent to a predetermined position of the coating station 2 by the first conveyor 6.
At this position, the first
sent to a stop position, then sent to a second stop position,
Finally, it is placed on the end of the second conveyor 10. When there are two coating devices as in the embodiment, four positions arranged in a line in the direction orthogonal to the conveyance of the conveyor are fixed integrally to the progressive conveyance mechanism 11 and extended at right angles, and three conveyor arms 9 are used. The molded product 8 is conveyed from the first conveyor 6 to the second conveyor 10 by three rectangular movements.
A coating device 12 is disposed above the coating position as shown in FIG. The lower end of the rotating shaft 15 serves as a rotor for a pump 16. Further, a stirring blade 17 is provided at the lower part of the rotating shaft 15 to maintain the homogeneity of the coating agent and to transfer heat. A heat conductive medium circulation muffler 19 is installed around the tank to keep the temperature of the paint constant, and hot water is circulated in winter and cooling water is circulated in summer. A slurry coating gun 18a connected to a pump directs its coating injection port toward the molded product 8. Two slurry coating guns 18a are arranged in parallel to coat one molded article 8, and a separate tank 14 is connected to each of the two coating guns 18a. 18b is a top coat paint gun, and 20 is a top coat paint tank.

Referring to FIG. 3, details of the structure and handling of the slurry coating gun 18a will be described. A cylindrical tank 14 for storing slurry as a coating agent is shown, and this tank 14 is supported by a machine frame 21, with a rotating shaft 15 passing vertically through the center and rotatably supported above and below the tank. The upper end of the rotary shaft 15 is connected to the drive shaft of a rotary motor 13, which is preferably continuously variable speed and is mounted on the machine frame 21 above the tank 14. Also, the lower end of the tank 14 is connected to the pump 16.
It ends in Although it is possible to use a helical diaphragm pump as the pump 16, a mono pump in which a single threaded shaft 22 rotates eccentrically in a double threaded sleeve provided on the stator 34 is used. It is better. tank 1
A rotating shaft 15 passing through the motor 4 is connected to a threaded shaft 22 of the Mono pump 16. A stirring blade 17 is attached to the lower part of the rotating shaft 15 to maintain uniformity of the coating agent and improve heat transfer. Since the concentration and viscosity of the paint used are easily affected by temperature, the tank 14 is surrounded by a muffler 19, with a thermally conductive medium (i.e., water) inlet 23 at the bottom and an outlet 24 at the top. The temperature of the paint is kept constant by circulating hot water in the winter and cooling water in the summer.

The lower outlet 25 of the pump 16 is connected to a slurry coating gun 18 . Painting gun for slurry 1
8a has a paint agent supply chamber 26 at the front (right side in the drawing), has a paint agent injection port 27 at the tip of the paint agent supply chamber 26, and has a paint agent inlet at the other end and is a flexible It communicates with the outlet 25 of the pump 16 by a connecting pipe. On the axis of the slurry coating gun 18a,
A cylindrical sliding tube 28 extends through the paint supply chamber 26 at the front of the gun, and its front end is aligned with the paint injection port 27 . The sliding tube 28 is a supply tube for injection gas, that is, air, and its tip is formed into a tapered shape, and the inner wall of the paint injection port 27 of the gun casing is also tapered.
When the paint supply chamber 26 is moved and joined to the injection port 27, the coating agent supply chamber 26 is blocked from the coating agent injection port 27.
The rear end of the sliding tube 28 passes through the rear part of the gun casing and projects from the rear end of the gun. The rear end of this sliding pipe 28 is connected to an injection gas on-off valve 29 which is preferably a 1-port, 1-position normally closed type solenoid valve.
It is connected to an air source 30 via. A cylinder chamber 31 for operating the sliding tube 28 is formed at the rear of the gun, and an operating piston 32 that is fitted and fixed around the sliding tube 28 slides in the cylinder chamber 31. A seal between the wall of the cylinder 31 and the piston 32 is provided by an O-ring 33. A through hole 34 for guiding the sliding tube 28 is provided in the wall separating the cylinder chamber 31 and the paint supply chamber 26, and both chambers are sealed by an O-ring 35. A working gas inlet 36 is provided at the inner end of the cylinder chamber 31, and is connected to a working air source via a switching valve 37 which is preferably a 2-port, 2-position normally closed type solenoid valve. At the outer end of the cylinder chamber 31, that is, at the rear end of the gun casing, a return spring 38 is disposed between the end wall and the piston 32. The end wall has a threaded opening 40 coaxial with the sliding tube 28.
An adjustment screw 41 having an opening 39 through which the sliding tube 28 passes through the center is screwed into the opening 40, thereby making it possible to adjust the end position of the piston 32, that is, the retracted position of the sliding tube 28. Therefore, the amount of paint supplied at the paint injection port 27 can be adjusted.
Although the sliding tube 26 and the opening of the adjusting screw 41 may be brought into sliding contact, a gap may be provided. If sliding contact is to be made, air relief openings 42 are required in the end walls. An annular muffler 43 is attached and fixed around the front end of the painting gun 18, and the inner wall of the tip of the annular muffler 43 surrounds the injection port 27, and an annular injection gas chamber 44 is provided inside the tip of the muffler 43 through a diameter. Openings 45 facing diagonally forward and inward from the injection gas chamber 44 are provided at two locations. The muffler 43 also includes an inlet 47 that communicates the air source 30 with the injection gas chamber 44 via a one-port, one-position normally closed solenoid valve 46 . Air is supplied to this muffler 43 through two openings 4 that oppose each other via the diameter.
5 to form intersecting airflows forward to form a paint spray pattern.

A cleaning gun 48 injects a cleaning agent toward the tip of the slurry coating gun 18a. The illustrated cleaning device or cleaning gun 48 has a cleaning agent supply passage 49 on its axis, and four or six propellant gas supply passages 50, for example, arranged parallel to the supply passage 49 at equal intervals around the cleaning agent supply passage 49. The inlet opening 52 at the other end of the cleaning agent supply path 49 and the common inlet opening 53 of the cleaning agent wiping jet gas supply path 50 are connected to the cleaning agent supply path 49 near the gun tip opening 51, and the inlet opening 52 at the other end of the cleaning agent supply path 49 and the common inlet opening 53 of the cleaning agent wiping jet gas supply path 50 are connected to one port. It is connected to a cleaning agent tank 56 and an air source 30 via one-position normally closed solenoid valves 54 and 55, respectively. Cleaning agent tongue 56
Store cleaning agents such as alcohol, water, and thinner.

The operation of the coating apparatus having the above structure will be described below.

When the coating device is driven, the solenoid valves 29, 37, and 46 operate simultaneously with the rotation of the motor 12, and the coating gun 1 is activated.
The communication between the coating agent injection port 27 of No. 6 and the coating agent supply chamber 26 and the injection of the injection gas for conveying the coating agent and the pattern forming gas are started. The injection is stopped by stopping the motor and closing the opening of the paint supply chamber 27. Since the motor 12 is of a continuously variable speed type, it is possible to adjust the supply amount of the coating agent and the spray amount of the coating gun. The injection of the pattern forming gas and the injection of the coating agent injection gas are continued even after the injection of the coating agent is stopped, and the coating agent is peeled off from the tip of the coating gas, particularly around the injection port 27. The coating gun coats the molded product at the coating position, and when this one coating is completed and the operation of the coating gun is stopped, the coating gun remains at that position or is rotated to the cleaning position. When the cleaning device is activated, the cleaning agent supply solenoid valve 65 is activated, and the cleaning agent collides with the front end of the coating gun in the cleaning position, causing the paint to scatter. The jetting power of the cleaning agent can be increased by operating the injection gas supply solenoid valve 66 at the same time as the cleaning agent is supplied, but when the cleaning agent can be sprayed with just the internal pressure of the cleaning agent tank and the wide spread of the cleaning agent becomes an obstacle. Injected gas is not used to transport the cleaning agent, and after the supply of cleaning agent is stopped, the injection gas is supplied to the painting gun exclusively for wiping off the cleaning agent by the operation of the solenoid valve 66, and the presence of the injection gas at the front of the painting gun is Splash the cleaning agent and wipe it dry. Of course, when starting the supply of the cleaning agent and the injection gas at the same time, it is sufficient to stop the supply of the cleaning agent and then continue supplying only the injection gas. Of course, the cleaning method is not limited to the above-mentioned method or apparatus, and depending on the properties of the coating material or the condition of the object to be coated, cleaning may be carried out by interrupting the operation after a certain amount of work. After stopping, one cycle of the painting gun ends either as it is or by moving from the cleaning position to the painting position.

4a, 4b, 5a, 5b, and 6a to 6f show the structure and operation of the progressive conveyance mechanism 11 in the coating station 2 of the present invention.

Three conveyance arms 9 protrude from the progressive conveyance mechanism 11 (described later), and the conveyance arms 9, which have the same structure and the same size between each other, are U-shaped and can receive the molded product 8. The first conveyor 6 and the second conveyor 10 correspond at the same time as the transfer.
and the first and second pedestals 57, 5 at the painting position.
The shape has been selected so that it can move vertically and horizontally between 8. The first pedestal 57 in the first painting position and the second pedestal 58 in the second painting position are connected to the transfer arm 9.
A similarly shaped rectangular frame with a width that allows it to pass between both arms of the person is shown. The reason why there are two coating positions is to make it suitable for a coating method in which a top coat is applied on top of the slurry coating on the molded product. The number of coating positions is not limited to two; when performing only slurry coating, the number of coating positions and molded product holders provided there may be one, and the number of transfer arms 9 may be two; , three positions can be created between the second conveyor, which can be three painting positions, or two painting positions and a parking position for further treatment.

The progressive conveyance mechanism 11 is shown in FIGS. 5a and 5b, in which two parallel cylindrical horizontal guide shafts 59, 60 are fixed to the machine frame (not shown) of the conveyance mechanism 11, and the horizontal guide shaft 59,
60 each has three connecting blocks 6
The three sets of upper and lower connecting blocks 61, 62 further have vertical cylindrical holes, which are also connected to the three vertical guide shafts 65, which are cylindrical in shape. It is fitted into the cylindrical hole and fixed, and has an extension below the lower horizontal guide shaft, and an arm mounting block 66 passes through this lower extension so as to be slidable up and down. The three upper connecting blocks 61 are arranged at equal intervals by, for example, U-shaped connecting beams 67, and the transport arms 22 are arranged at equal intervals by connecting beams 68.
are connected by a piston rod of two sets of combined lifting air cylinders 69, and the upper connecting beam 67 connects to a piston sliding inside an air cylinder 70 fixed to the machine frame of the progressive conveyance mechanism 11. They are fixedly connected via a connected piston rod mounting plate 71.

A painting station having the above structure,
In particular, the working process of the progressive conveyance mechanism is shown in Figure 4a.
Figures 4b, 5a, 5b and 6a-f
This will be explained below with reference to . The position shown in FIG. 4a and FIG. Molded products are placed on a first molded product holder 57 at the first stop position and a second molded product holder 58 at the second stop position. and transfer arm 22
is waiting at the position shown in Figure 6a. What state are the lifting cylinders 69 in at this position? The upper low-speed feed lifting cylinder is at the position where the piston rod protrudes the most into the cylinder, and the lower fast-feeding lifting cylinder is at the position where the piston rod is the most inserted into the cylinder. It's in the right position. When the cylinder above this standby position is operated and contracted, no change is observed in Figure 4a, and Figure 6a
to FIG. 6b, and the transport arms 9 each support the moldings 7 together with the receiving iron plates. At the position shown in FIG. 6b, the upper lifting cylinder stops, and the piston rod of the horizontally moving cylinder 70 extends and connects the conveying grid, that is, the connecting beams 67, 68, the connecting blocks 61, 62, the vertical guide shaft 65, and the conveying arm. 9 is moved to the left side guided by horizontal guide shafts 59, 60 and reaches the position shown up to FIG. 6c. During this movement, paint guns 26, 27 spray paint, ie, slurry, and topcoat. Since a line pattern is formed by the pattern forming gas in a direction perpendicular to the direction of movement, a uniform coating is applied to the surface of the molded product 7 when the molded product is moved to the left at a predetermined speed. In this position, the paint gun 26, 2
7 is stopped, and the upper cylinder of the lifting cylinder 69 is actuated to extend the piston rod. On the way from the position shown in FIG. 6 c to the position shown in FIG. 9
The vertical position of the piston moves to the position a in Fig. 6 and stops, and at the same time as or before or after the stop, the lower rapid traverse lifting piston operates and the piston rod extends, and both piston rods are in the most extended position as shown in Fig. 6. d. This position only needs to be fast enough for the conveyor arm 9 to move horizontally and pass under both conveyors 6 and 10. This movement is achieved by operating the horizontal movement cylinder 70 to retract the piston rod and move the conveyor grid to the right. Returning, FIG. 6d leads to FIG. 6e. Comparing Figures 6d and 6e, you can see that the molded product moves, but this is not due to the transfer arm, but is due to the conveyors 6 and 10 feeding it into and out of the painting station. . Finally, the lower rapid traverse lifting cylinder is actuated to retract the piston rod to reach the position shown in FIG. 6f, which is the position shown in FIG. 6a, and the next cycle is prepared. This is because the low-speed feed cylinder receives and delivers molded products such as raw roof tiles, while the high-speed feed cylinder aims to shorten the time. During this transport cycle, the working time can be shortened by cleaning the painting gun as described above using the time from the end of the painting operation time of the painting gun until the start of the next working time.

In the embodiment shown in the drawings, both conveyors and
Three connected transport arms are shown reciprocating (square motion) simultaneously between four adjacent locations on the cradle of two molded parts. This is an example in which slurry painting and top coat painting are applied consecutively, but in some cases, if top coat is not applied, one pedestal is provided between both conveyors, and two In addition, if additional work is required in addition to the two types of painting, that need can be met by increasing the number of additional works. However, an important feature of the present invention is that the top coat can be applied almost immediately after slurry application.

Slurry coating agent is a special material with low moisture content.
Although a supply tank and a cleaning device are required as shown in the examples, it is not necessary to add any special equipment for other coating materials whose top coat is low in viscosity. Conventional paint guns can also be used.

Since the space in which the molded products are transported is contaminated by paint, the progressive transport mechanism 11 is equipped with a vertically disposed wide plate that isolates it from the transport space, and a transport arm 9 connected to the transport mechanism 11. The only thing is that it is placed in the transport space through a groove that allows it to go up and down. Horizontal movement is performed integrally with the separator, and lifting and lowering is performed by moving through a groove provided in the separator.

[Brief explanation of the drawing]

FIG. 1 is a front view of a coating apparatus of the present invention and an automatic cement mortar molded product manufacturing apparatus operatively connected thereto, and FIG. 2 is a plan view of the apparatus of FIG. 1.
FIG. 3 is a schematic cross-sectional view showing a part of the painting gun and its accessory equipment used in the painting apparatus of the present invention.
FIGS. 4a and 4b are plan views of the conveying device used in the coating apparatus of the present invention, showing the moving state. Chapter 5a
5B are an elevational view and a side view showing the main parts of the progressive conveyance mechanism of the conveyance device shown in FIG. 4B. FIGS. 6a to 6f are elevational views showing the conveyance process of the molded product. 6... Supply conveyor, 9... Transfer arm, 10
... Delivery conveyor, 11 ... Progressive conveyance mechanism, 1
8a, 18b...painting gun, 48...cleaning device,
57, 58... Molded product holder, 59, 60... Horizontal guide shaft, 65... Vertical guide shaft.

Claims (1)

[Scope of Claims] 1. At least one molded product pedestal disposed between the supply conveyor and the delivery conveyor, and at least one corresponding coating gun disposed above the pedestal;
It consists of a cleaning device, a plurality of transfer arms that move between adjacent locations of both conveyors and the cradle, and a progressive transfer mechanism that supports and drives the transfer arms, and the transfer mechanism moves a plurality of transfer arms that move a horizontal guide shaft. a plurality of vertical guide shafts for moving horizontal guide shafts, the plurality of vertical guide shafts being interconnected and driven by air cylinders, and a plurality of conveying arms for moving the vertical guide shafts; The coating apparatus is characterized in that the coating apparatus is driven by a plurality of interconnected lifting air cylinders. 2. The coating apparatus according to claim 1, wherein each of the transfer arms is forked, and the interval between the forks is larger than the width of both conveyors and the pedestal. 3. One of the combined lifting air cylinders performs a vertical movement at low speed to reach the upper limit position by passing the molded product delivery position of the transport arm, and the other performs vertical movement at high speed until the transport arm reaches the lower limit position. A coating apparatus according to claim 1, characterized in that: 4. The coating apparatus according to claim 1, characterized in that a wide plate is vertically arranged to isolate the progressive conveyance mechanism from the coating space, so that only the conveyance arm moves in the coating space.