KR870000794Y1 - Barrel-type coating apparatus - Google Patents

Abstract

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Description

Barrel Coating Machine

1 is a plan view of the coating apparatus according to the invention.

2 is a plan view of a portion of the coating apparatus shown in FIG.

3 is a cross-sectional view taken along line III-III of FIG.

4 is an enlarged sectional view taken along the line IV-IV of FIG.

5 is an enlarged cross-sectional view taken along the line VV of FIG.

FIG. 6 shows the barrel in elevated position as line VI-VI in FIG. 2,

FIG. 7 is a view similar to FIG. 6 showing the barrel in the lowered position, FIG.

FIG. 8 is an enlarged sectional view of the X-ray of FIG. 2 showing the parts in the coating position,

9 is an enlarged cross-sectional view of the X-ray of FIG.

FIG. 10 is an enlarged sectional view of the X-ray of FIG. 2; FIG.

11 is an enlarged sectional view taken along the line XI-XI of FIG. 10;

12 is a block diagram of a control circuit for operation control of the apparatus shown in FIG.

* Explanation of symbols for main parts of the drawings

20: coating apparatus 21: annular housing

23: roller 25: drive mechanism

27: drive shaft 26: inner circumferential wall

29; Step motor 33: horizontal partition wall

34,35: chamber 36: rail

37: horizontal slot 38: barrel

41: axis 43: motor

46: guide roller 47: support plate

48: input / discharge chamber 49: spray chamber

50: setting room 51: heat drying room

52: cooling chamber 53: flexible screen

54: vertical slit 55: Schut

56 supply port 57 outer circumferential wall

58 opening 59 separation piece

60: fluid pressure cylinder 61: outlet

62: slope 63: opening

64: spray nozzle 65: hot air blower

66: heating device 67: blower pipe

68: inlet 69: heater

70: power fan 71,72: hole

73: refrigeration blower 74: duct

75: blower pipe 76: inlet

77: power fan 78: hole

79,80 ring 81: connecting rod

82: pillar 83: groove

84: support rod 85: fluid pressure cylinder

86: limit switch 87,88: protrusion

89: control circuit 90: counter

91: first drive circuit 92: reset circuit

93: second drive circuit

The present invention relates to a barrel coating device suitable for coating a slider fastener and small parts such as upper, lower limbs, buttons, and other ornaments in a fixed quantity.

BACKGROUND ART Various types of barrel coating apparatuses are known in which small parts are injected into a rotating barrel and sprayed paint on the parts. The paint applied to the small parts is fixed, set, heat dried, and finally cooled. These series of processes are repeated until the coating film on a small part becomes desired thickness. A typical example of such a coating apparatus is disclosed in Japanese Patent Application No. 53-18063 dated June 13, 1978.

According to this coating apparatus, the barrel is rotatably mounted in a cup-shaped drum, and the whole process of paint spraying, setting, heat drying, cooling, etc. is performed in one same drum. According to the arrangement arranged in this way, during the heat drying and cooling treatment, the atmosphere in the drum must be changed sequentially according to each process. Such a change consumes a lot of heat energy and requires a relatively long treatment time, thereby reducing productivity. do.

A device for coating small parts according to the present invention in a fixed quantity is provided with a housing which rotates intermittently and a plurality of barrels of wire meshes arranged at regular intervals in the circumferential direction of the housing and open radially outward to accommodate a small amount of small parts. Have them. In order for the barrels of wire mesh to be able to rotate and oscillate at the same time, a shaft is connected to the barrel, and an annular rail is arranged concentrically with the housing to support the shaft, and the column is located outside the housing. And radially inwardly spaced from the housing, a drive mechanism is mounted to the column and rotatably coupled to the shaft. The housing is disposed on the annular base, in which a series of input chambers, discharge chambers, spray chambers, setting chambers, heat drying chambers, and cooling chambers are arranged circumferentially and separated by a flexible screen, each chamber of the housing Each turn moves sequentially along the barrel. A plurality of paint spray nozzles are disposed along the outer periphery of the housing substantially opposite each barrel, and each nozzle can independently move near and away from the housing. The shaft portion of each barrel is capable of riding on a rail arranged concentrically within the housing, such that the shaft portion and the barrel are inclined upward with respect to the rotating surface of the housing. The rail has a separating piece that can be retracted to the lowered position so that one barrel supported thereon can be tilted to the discharged position. The input / exhaust chamber has a pair of vertically spaced openings for injecting the quantity of small parts to be coated into one barrel or for discharging the treated quantity of small parts. The spray chamber has an opening for the spray nozzle to enter the spray chamber. Likewise, the heat drying chamber and the cooling chamber each have at least one opening for introducing a heating and cooling medium.

It is therefore an object of the present invention to provide an apparatus for coating small quantities of small parts at high production rates.

Another object of the present invention is to provide a barrel-type coating apparatus for coating a small amount of small parts with a coating layer having a different color and thickness for each barrel.

Hereinafter, with reference to the accompanying drawings for a preferred embodiment of the present invention will be described in detail.

The principle of this design is particularly useful when implemented with a coating apparatus in which the entirety is indicated by reference numerals 20 from 1 to 3.

The coating apparatus 20 is composed of a ring shape, ie, an annular housing 21, which is rotatably installed on the annular base 22 via a plurality of rollers 23, and the annular base 22 is a building floor 24. It is installed in). The coating apparatus 20 has a drive mechanism 25 arranged on the building floor 24 at the center of the space formed by the inner circumferential wall 26 of the housing 21. The drive mechanism 25 includes a vertical drive shaft 27 that is rotatably installed on the frame 28 of the mechanism 25 and extends in alignment with the central axis of the housing 21. The step motor 29 is installed on the frame 28 and is coupled to the drive shaft 27 via the reduction gear 30 to intermittently rotate the drive shaft 27. As shown in FIGS. 1 and 3, a plurality of equiangularly spaced connecting arms 31 are rotated radially inwardly from the inner circumferential wall 26 of the housing at an angle to the shaft (27). It extends to the hub 32 which is fixed to 27. When the step motor 29 is operated by this configuration, the shaft 27 intermittently rotates the housing 21 on the annular base 22.

As shown in FIG. 3, the body of the housing 21 is hollow and has a horizontal partition wall 33 which divides the internal space of the housing 21 into a pair of upper and lower chambers 34 and 35. As shown in FIG. The annular rail 36 in the housing is provided on the partition wall 33 adjacent to the inner circumferential wall 26 and protrudes into the upper chamber 34. The inner circumferential wall 26 has an annular horizontal slot 37 extending side by side with the rail 36.

Multiple barrels 38 of wire mesh (12 are shown in FIG. 2) are arranged at regular intervals in the upper chamber 34 of the housing. One end 39 of the angular barrel 38 is radially outwardly connected and the other end is concentrically connected to an axis 41 extending through the horizontal slot 37. The shaft 41 is connected to the barrel drive mechanisms 43, 44, 45 mounted on the pillar 40. The shaft 41 includes a universal joint 42 installed outside the housing 21, and is rotatably supported on the column 40 provided between the housing 21 and the housing drive mechanism 25. The motor 43 is supported by the column 40 and has a drive mechanism 44 which is driven in engagement with a driven gear 45 which transmits power to the shaft 41. The barrel 38 rotates about each axis 41 according to the operation of each motor 43. As shown in FIG. 11, a pair of guide rollers 46, 46 extend parallel to the axis 41, both ends of which are connected to the shaft 41 between the barrel 38 and the universal joint 42. It is supported so that it may rotate on the pair of support plates 47 and 47 which were made. The support plates 47 and 47 are substantially triangular, and the shaft 41 and the roller 46 are provided adjacent to the corners of the triangular support plate 47, respectively. As shown in FIGS. 3, 5, 10 and 11, the barrel 88 is inclined upward by guide rollers 46 and 46 which slide and roll over the annular rail 36 of the partition wall 33.

As shown in FIG. 2, the upper chamber 34 of the housing 21 has five seals 48-52 separated into five flexible screens 53. Each chamber 48-52 is composed of an input / discharge chamber 48, a spray chamber 49, a setting chamber 50, a heat drying chamber 51, and a cooling chamber 52, and clockwise in FIG. Are arranged in order. Each screen 53 is preferably made of rubber or canvas cloth, and the upper chamber 34 is divided into several chambers 48-52 to form an annular tunnel as shown in FIG. It is draped vertically from the top wall of the housing 21 across the 34. The screen 53 has several vertical slits 54 extending from the lower end to the upper end of the upper chamber 34 as shown in FIG. 4, so that the barrel 38 is rotated when the housing 21 rotates. 53) can be passed through smoothly.

The circumferential length of each chamber 48-52 is determined by the required processing time in each chamber. In the illustrated embodiment, one barrel 38 is housed in the spray chamber 49, and each of the two barrels 38 is each of the input / exhaust chamber 48, the setting chamber 50, and the cooling chamber 52. And the heat drying chamber 51 accommodates the remaining five barrels 38.

As shown in FIGS. 2 and 5, the chute 55 extending into the input / discharge chamber 48 through the supply port 56 provided on the outer circumferential wall 57 of the housing 21 is an input / discharge chamber. It is intended to inject several small parts (not shown) into the barrel 38 toward the open end 39 of one barrel 38 (left of FIG. 2) contained in 48. As shown in FIG. 6 and FIG. 7, the partition wall 33 of the housing 21 has a lower inclined discharge position (Fig. 6) in which the other barrel 38 in the input / exhaust chamber 48 is upwardly inclined (FIG. 6). FIG. 7) has an opening 58 which allows the small parts to be coated to move out of the barrel 38. More specifically, the annular rail 36 includes a separating piece 59 fixed to the end of the piston rod of the fluid pressure cylinder 60 mounted to the housing 21, so that the separating piece 59 is provided. It radially corresponds to this opening 58 and can retract vertically from the rest of the annular rail 36. When the cylinder 60 is operated to retract the piston rod, the separating piece 59 is lowered and the support point of the roller 46 lying thereon is lowered so that the barrel 38 moves downward through the opening 58 in FIG. Lower until you move to the photo ejecting position. The small parts in the barrel 38 are then discharged through an outlet 61 in the open end 39 and the housing outer circumferential wall 57 and loaded onto a horizontal conveyor (not shown) for storage or further processing. The bottom wall of the housing 21 has an inclined surface 62 which is installed below the opening 58 and is inclined toward the outlet 61, so that the coated articles are not accumulated on the bottom wall toward the outlet 61. It can slide by self load along the slope 62 below.

As shown in FIG. 8, the outer peripheral wall 57 of the housing 21 is provided with an opening 63 so that the paint spray nozzle 64 can enter the spray chamber 49. In the spray chamber 49, automatic spraying of the paint is carried out in the barrel 38, and the paint is spray deposited on the small parts. The structure for supporting and operating the spray nozzle 64 will be described below.

As shown in FIG. 2, the housing 21 has no openings in communication with the setting chamber 50 other than the horizontal slot 37 for passage of the shaft 41.

2 and 3 again, a hot air blower 65 is installed along the heat drying chamber 51. The blowers 65 are elongated heating mechanisms 66 mounted on the outer circumferential wall 57 of the housing, and five blower pipes 67 in which both ends communicate with the heating mechanism 66 and the heat drying chamber 51. It consists of. One end of each pipe 67 is housed in an inlet 68 provided in the outer circumferential wall 57 of the housing and is open toward the open end 39 of the barrel 38 housed in the heat drying chamber 57. . The heat generating mechanism 66 is a power fan for ventilating into each barrel 30 through the heater 69, the heater 69 installed behind the heater 69, the pipe 67, and the open end 39. It has 70 and heat-drys the coating coated on the small part in the rotating barrel 38 by these. The hot air blown into the barrel 38 is then returned from the heat-drying chamber 51 to the heating mechanism 66, but at this time there are several holes 71 and outer peripheral walls 57 in the horizontal partition wall 33. Pass through several holes 72 (only one is shown) (FIG. 3).

As shown in FIG. 2, the cold air blower 73 is provided along the cooling chamber 52, and is provided in the elongated duct 74 installed in the outer circumferential wall 57 of the housing, and in the duct and the cooling chamber 52. It has a pair of blower pipes 75 which both ends communicate. As shown in FIG. 10, one end of each pipe 75 is fitted into the inlet 76 of the outer circumferential wall 57, and one open end 39 of one rotating barrel 38 housed in the cooling chamber 52 is provided. Open towards The power fan 77 is installed in the duct 74 to suck outside air into the duct 74 through the hole 78 and blow into the barrel 38 through the pipe 75 and the open end 39 to the inside of the barrel. Cool the small parts. The cold air blown into the barrel 38 is exhausted from the cooling chamber 52 through the horizontal slot 37 provided in the inner circumferential wall 26.

As shown in the first, second, third, eight, and nine degrees, the means for supporting the spray nozzle comprises a pair of concentric rings 79, 80 arranged inward and outward with the annular housing 21, respectively. It is composed of a plurality of connecting rods 81, which are arranged at regular angle intervals so as to extend between the concentric rings 79, 80 and connect the rings with each other. The number of connecting rods 81 corresponds to the number of barrels 38, and the connecting rod 81 is provided on the shaft 41 of each barrel 38 in correspondence. The outer ring 80 is supported by several pillars 82 arranged at even intervals on the circumference thereof. As shown in FIG. 8 and FIG. 9, the lower side of each connecting rod 81 has a longitudinal groove 83 extending from the outer ring 80 toward the inner ring 79, and the cross section of this groove 83 is shown. Is approximately T-shaped. A vertical support rod 84 is slidably mounted in the groove 83 and supports the paint spray nozzle 64. The support rod 84 is connected to the piston end of the fluid pressure cylinder 85 provided in the connecting rod 81 adjacent to the inner ring 79. When the cylinder 85 is operated to retract the piston rod, the support rod 84 moves from the position in FIG. 3 to the position in FIG. 8, and the spray nozzle 64 enters the spray chamber 49 through the opening 63. do.

The number of spraying operations is automatically detected for each barrel by controlling the operation of the coating apparatus so that a coating layer having a different thickness and color according to each barrel 38 is finally coated on the small parts. When the detected water of the spraying operation reaches a predetermined number in the discharge process, that is, when the housing 21 rotates 360 ° with respect to each barrel 38, the barrel 38 is inclined downward to discharge small parts. The discharged small parts are painted with a coating layer of the desired thickness and color. To this end, several limit switches 86 are provided on the building floor 24 along the circumference of the housing 21, and the position of each limit switch 86 corresponds to each barrel 38. The pair of actuating projections 87 and 88 is fixed to the housing 21 under each of the spray chamber 49 and the discharge port 58. Each of the operation projections 87 and 88 corresponds to the barrel 38 in the spray chamber 49 and the barrel 38 supported on the rail separating piece 59 in the input / discharge chamber 48, respectively. have. Two limit switches 86 can be caught by the projections 86 and 87, respectively, so that the projections activate this limit switch while the annular housing 21 is stationary. When each limit switch 86 is operated, an electric signal is sent to the control circuit 89 shown in FIG.

The control circuit 89 is provided for each barrel 38. This control circuit 89 is connected in series with the counter 90 for receiving an electrical signal from the corresponding limit switch 86 and the counter 90 to the cylinder 60 in accordance with the thrust signal of the counter 90. A reset circuit connected to the first drive circuit 91 for sending an operation signal and the counter 90 and the first drive circuit 91 to reset the counter 90 in accordance with the output signal of the drive circuit 91. And a second drive circuit 93 connected to the limit switch 86 and the cylinder 85 to operate the cylinder 85 in accordance with the signal of the limit switch 86. The counter 90 receives the electric signal from the limit switch 86 twice during the process in which the housing 21 rotates once, so that the numerical value registered in the counter is twice the number of spray executions.

Coating apparatus 20 operates as follows. In FIG. 2, small parts to be spray-coated are introduced into one empty barrel 38 at position A via one opening 56 (FIG. 5) and an open end 39. FIG. The housing 21 is angularly moved in the counterclockwise direction in FIG. 2 to move to the position A where the spray chamber 49 coincides with the open end 39 of the barrel. At the same time, the actuating projection 87 is caught by the limit switch 86 to actuate the limit switch 86 to operate the second driving circuit 93 (FIG. 12). When the second drive circuit 93 is operated, the cylinder 85 retracts the piston rod to project the spray nozzle 64 through the opening 63 into the spray chamber 49 (FIG. 8).

The housing 21 is temporarily stopped for spraying operation, and the barrel 38 is continuously rotated by the motor 43 corresponding to the barrel. Paint is sprayed from the spray nozzle 64 onto the small parts in the rotating barrel 38, and the amount coated by one spraying operation forms a much thinner film than the final film with the desired thickness. Since the extra paint sprayed without being applied to the small parts runs out through the wire mesh of the barrel 38, the coating film of the small parts can be uniformly formed without the coating being irregularly deposited.

When paint is spray deposited on the small parts, the housing 21 is then driven by the central drive mechanism 25 to perform the intermittent angular movement of the second stage. In the meantime, the paint coated on the small parts in the rotating barrel 38 is fixed in the setting chamber 50.

The housing 21 then angularly moves over five steps. Hot air is blown from the pipe 67 to the barrel 38 in the heat drying chamber 51 to heat-dry the coating film of the small parts. Thereafter, the housing 21 moves intermittently two more steps, and cold air is blown from the pipe 75 into the barrel 38 accommodated in the cooling chamber 52 to cool the heat-dried paint on the small parts. The barrel 38 rotates continuously even during the heat drying and cooling process.

The housing 21 is further rotated in stages to bring the outlet 58 (FIG. 6) to position A, where the actuating projection 88 activates the limit switch 86 to counter the electrical signal 90. Send to.

Thus, one process of coating the small parts put into one barrel 38 is finished. A series of intermittent angular motions is repeated until the paint layer coated on the small part has the desired thickness. When the limit switch 86 sends an electric signal to the counter 90 after a predetermined number of spraying steps, the counter 90 sends an output signal to the drive circuit 91, at which time the cylinder 60 is operated and the piston Retract the rod and rail separating piece 59. Thus, the barrel 38 mounted on the separating piece 59 is inclined downward to reach the discharge position (FIG. 7) to discharge the coated small parts from the barrel. The small parts then slide down along the slope 62 toward the outlet 61. The counter 90 is reset to the signal of the drive circuit 91.

The foregoing operation of the coating apparatus 20 has been described only in relation to the barrel 38 in position A. Similarly, the same applies to the other barrels 38 at each of the positions B and L by angular movement in the counterclockwise direction, one step after another in FIG. 2, so that each barrel has its own color and thickness. It is possible to coat a small amount of small parts with a different coating layer. For better understanding, the process is shown in the table below at each position (A)-(L). In this table, the letter L represents the input process, P the spray-coating process, S the setting process, B the heat drying process, C the cooling process, and D the discharge process.

[table]

The coating apparatus of the present invention configured as described above has the following effects.

The tunnel-shaped chamber 34 of the annular hollow housing 21 which rotates intermittently is separated by the flexible screen 53, and the input / discharge chamber 48, the spray chamber 49, the setting chamber 50, and the heat drying chamber 51 and the cooling chamber 52 are formed in order. Since the housing 21 is intermittently rotated to pass each chamber 48-51 sequentially with respect to each barrel 38 fixed in a radially spaced position, the atmosphere of each chamber always depends on the processing thereof. Maintain proper conditions. More specifically, since the heat drying chamber is always heated and the inner chamber is always cooled, it does not involve a large amount of heat energy loss and time wasted when changing the conventional atmosphere. Therefore, the coating process can be performed in a relatively short time and productivity can be greatly improved.

In addition, each paint spray nozzle 64 is provided for each barrel to face the open end 39 so that the paint layer of the desired color can be sprayed on the components in each barrel. By varying the number of sprays for each barrel, the articles in the barrel can be coated with a final coating layer of the desired thickness.

That is, the coating apparatus of the present invention can coat light weight small parts such that each barrel has a paint layer having a different color and thickness at a high production speed without loss of thermal energy.

Claims (14)

(a) an annular hollow housing 21 which can rotate in a plane about the central axis, a series of input / exhaust chambers 48, formed by partitioning the annular space within the housing with flexible screens 53, A housing 21 having a roomless chamber 49, a setting chamber 50, a heat-drying chamber 51, and a cooling chamber 52, and an annular rail 36 extending concentrically with the housing through the chambers, and (b Located in the housing 21 at an angular interval, rotatably and swingably supported outside the housing and entering through an annular horizontal slot 37 installed over the entire circumference of the inner circumferential wall 26 of the housing. A plurality of rotating barrels 38 having shafts 41, which accommodate small quantities of small parts, wherein the portion 46 of each shaft rides over the rails 36 so that the shaft portion and barrels ( Rotating barrels 38 adapted to be tilted upward with respect to the housing plane (38) and (c) disposed along the outer periphery of the housing (21) facing the rotary barrel (38), respectively, and operatively connected to the nozzle actuator (85) to move near and away from the housing. A plurality of paint spray nozzles 64, (d) a first opening 56 for supplying a small quantity of small parts to one barrel 38, and coating A third opening 63 having a second opening 61 for discharging small quantities of small parts from the housing and passing through the spray chamber 49 when one of the paint spray nozzles 64 moves into and out of the housing; The heat drying chamber 51 has at least one fourth opening 68 for introducing hot air into the heat drying chamber 51, and the cooling chamber 52 has cold air in the cooling chamber 52. Has at least one fifth opening 76 for introducing the first and fifth openings, and the first to fifth openings stop the housing 21. And one of the rotating barrels 38 corresponding to positions of the rotating barrels 38 respectively corresponding to the second openings 61 at the time of discharge of the rails 36 in the housing. Barrel-type coating device, characterized in that it comprises a separation surface (59) that can be retracted to the lowered position for tilting. The barrel type coating apparatus according to claim 1, wherein the housing (21) is horizontal. The barrel type coating apparatus according to claim 1, wherein the housing (21) is installed in an annular holder (22) via a plurality of rollers (23). 2. The housing (21) according to claim 1, wherein the housing (21) has a partition wall (33) for dividing its interior space into a pair of upper and lower chambers (34, 35) and supporting the rail (36). Barrel type coating apparatus, wherein a seal is located in the upper chamber (34) and the second opening (61) faces the lower chamber (35). 5. Barrel coating apparatus according to claim 4, wherein the partition wall (33) comprises an opening (58) angularly coincident with the separating piece (59) of the rail (36). According to claim 1, comprising a drive mechanism 25 for intermittently rotating the housing 21, the drive mechanism 25 extends along the central axis of the housing coupled to the step motor 29 A drive shaft 27, a hub 32 fixed to the drive shaft to rotate together with the drive shaft, and a plurality of equally spaced arms extending between the eagle to connect the housing 21 and the hub 32 together Barrel type coating device comprising a 31. The barrel type coating apparatus according to claim 1, wherein said flexible screen (53) is made of rubber. The barrel type coating apparatus according to claim 1, wherein said flexible screen (53) is made of canvas cloth. 2. Barrel coating apparatus according to claim 1, wherein the flexible screen (53) has a plurality of slits (54) extending perpendicular to the plane. The barrel coating apparatus according to claim 1, wherein the shaft portion includes a pair of rollers (46, 46) extending parallel to the shaft and rotatably mounted to the shaft. The heat drying chamber (51) according to claim 1, further comprising a blower pipe (67) connected to the heat generating device (66) and one end connected to the heat generating device (66), and the other end inserted into the fourth opening (68). And a hot air blower (65) disposed along the side, wherein the heat generating mechanism (66) is connected to the heater (69), the heater (69), the pipe (67), and the fourth opening (68). Barrel type coating device comprising a power fan (70) for blowing air into the drying chamber (51). 12. The barrel type coating apparatus according to claim 11, wherein the heat drying chamber (51) includes another opening (72) communicating with the heat generating mechanism (66) to return hot air to the heat generating mechanism. 2. The cold blower blower (73) according to claim 1, further comprising a cold blower (73) disposed along the cooling chamber (52), wherein the cold blower (73) is provided on the housing (74), and one end of the cold blower (73). A blower pipe 75 communicating with and fitted into the fifth opening 76, and disposed in the duct 74, through the blower pipe 75 and the fifth opening 76, the cooling chamber 52. Barrel type coating device comprising a power fan (77) for blowing outside air to the furnace. 2. A pair of rings (79) according to claim 1, comprising a device for supporting and actuating the paint spray nozzles (64), wherein said support and actuating device are respectively arranged concentrically in and out of said housing (21). 80, a plurality of pillars 82 supporting one of the rings 80 in a plane parallel to the plane, a plurality of isometrics extending between the rings 79, 80 to connect the rings together Spaced apart connecting rods 81 and support rods 84 installed on each of the connecting rods 81 so as to slide longitudinally along the connecting rods, and support one paint spray nozzle 64; Nozzle actuators are respectively installed on the connecting rods 81 and connected to the supporting rods 84 to form fluid actuators 85 for moving the supporting rods 84 and the paint spray nozzles 64 into and out of the spray chamber. Barrel coating equipment.