JPH0450909Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a rotating system that sprays paint in the form of a mist from the periphery of a rotating disk onto the lower end of a rod that protrudes downward from a hydraulic cylinder fixed above the painting booth. The present invention relates to a hydraulic lifting device for fixing a disk-type electrostatic coating machine and lifting and lowering a rotary disk with respect to an object to be coated that is conveyed horizontally by a conveyor.

Problems to be solved by conventional techniques and ideas The hydraulic lifting device for the rotating disk type electrostatic coating machine as described above does not allow the paint to be applied to the object to be coated because the coating machine only discharges the paint in a substantially horizontal direction. During the painting process, it is necessary to move the rod up and down continuously to raise and lower the paint in order to apply the paint evenly.
For this reason, the packing at the sliding part between the rod and cylinder is severely worn and the hydraulic oil inside the cylinder tends to leak from there.As a countermeasure, if you stop work immediately and replace the packing when it starts leaking, Conventionally, an oil receiver with a discharge port was attached to the rod to collect leaked hydraulic oil, and this oil was periodically removed. This was done by pouring it out of the outlet and receiving it in another container, but this sampling work required stopping the rod and interrupting painting, and it also required that the rod be stopped during the work. If oil drips from the discharge port into the coating machine below the oil receiver and adheres to its rotating disk, there is a problem that this hydraulic oil may mix with paint and adhere to the object being painted, resulting in defective products. Ta.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a rotary disk attached to the lower end of a rod that protrudes freely forward and backward from the lower end surface of a hydraulic cylinder fixed in an upright position above the painting booth. In a hydraulic elevating device for a rotary disk type electrostatic coating machine, which is fixed to a rotating disk type electrostatic coating machine that discharges paint in the form of a mist from the periphery of the rod, an oil receiver for storing hydraulic oil leaking from the hydraulic cylinder in the rod. In addition to attaching the oil receiver, a suction pipe is provided whose suction port is located inside the oil receiver at least when the oil receiver is raised, and the suction pipe is connected to a discharge pump.

Function Hydraulic oil leaking from the sliding part between the rod and cylinder travels through the rod and is collected in the oil receiver, and the accumulated hydraulic oil is sucked up through the suction pipe and discharged by operation of the pump.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the accompanying drawings.

In a painting booth A where a part of the conveyor b that conveys the workpiece a horizontally is laid in an Ω-shape and a support plate 1 is stretched above, the speed is constant regardless of the direction in which the workpiece a is conveyed. The object to be coated is conveyed in a substantially circular shape while maintaining the orientation of the object to be painted, and a support tube 3 is erected around the periphery of a mounting hole 2 formed at a position directly above the center of the circle drawn by the object a on the support plate 1. and support tube 3
A hydraulic cylinder 5 is fixed to the lower surface of the lid 4 attached to the upper end with its rod 6 protruding downward, and an elevating cylinder 7 surrounding the hydraulic cylinder 5 is attached to the rod 6. Support plate 1 on the outer periphery
A plurality of support rollers 8 are fixed to the rod 6 to prevent it from tilting when going up and down. Step 9 is to release the paint dropped onto a rotating disk (not shown) in a mist form and adhere to the object a by using the electrostatic field formed between the paint and the object a and the centrifugal force caused by the rotation of the disk. At the same time, when painting, use Rod 6.
As a result of the expansion and contraction of the object a, it moves up and down with a stroke corresponding to the length of the object a in the vertical direction.

As shown in FIG.
A male thread 13 is formed at the lower end of the mounting body 11, which is tightly and slidably fitted into the sliding hole 27 in which the mounting body 11 is fitted, and is fixed to the tip of the mounting body 11 via the connecting body 20. A stepped diameter-reduced portion 14 is formed, and a circular bottom plate 12 is fitted into the center hole 15 of the diameter-reduced portion 14, and a male thread is inserted through a sealing ring body 16 having an O-ring 17 fitted on the inner surface. The bottom plate 12 is fixed by tightening a nut 18 screwed into the bottom plate 13, and the above-mentioned rotating disk type electrostatic coating machine 9 is fixed to the bottom surface of the bottom plate 12, and the above-mentioned electrostatic coating machine 9 is fixed to the top surface of the bottom plate 12. The elevating tube 7 is fixed by a bolt 21 with an inward flange 19 formed on the lower end of the elevating tube 7 in close contact via an O-ring 22, and the lower end of the elevating tube 7 and the bottom plate 12 An oil receiving part 30 is formed with an open oil receiving part 30, and an elongated suction pipe 31 penetrates through the lid body 4 and hangs down inside the elevator cylinder 7, and is fixed to the hydraulic cylinder 5. As shown by the solid line in FIG.
The lid body 4 of this suction pipe 31 is inserted into the oil receiver 30 when the suction pipe 31 reaches the upper position.
The upper end protruding from is connected to a pump device 40, which pumps clean and appropriately pressurized pressurized air supplied from an air supply source 41 through a control valve 44 with a filter 42 and a pressure gauge 43. is made to flow through the vacuum generator 45 to create a negative pressure in the suction pipe 31 and suck up the hydraulic oil in the oil receiver 30, and the sucked up hydraulic oil and pressurized air Both are sent from the vacuum generator 45 to the oil separation filter 46, where the pressurized air is released to the outside air and the hydraulic oil is stored and sent to the oil separation filter 46.
By opening 7, it can be returned into the tank 48.

Next, the operation of this embodiment will be explained.

If the O-ring 26 of the rod cover 25 wears out due to the repeated expansion and contraction of the rod 6 as the painting operation continues, and the hydraulic oil in the hydraulic cylinder 5 leaks,
This hydraulic oil is applied to the rod 6, the connecting body 20, and the mounting body 11.
If the pump device 40 is driven without stopping the operation, when the rod 6 contracts and the oil receiver 30 rises, the suction pipe 31 will absorb the oil. Port 32 is oil receiver 30
The hydraulic oil passes through the suction pipe 31 and is sucked up without adhering to the sprayer 9, and when the oil receiver 30 is lowered, the suction port 32 is exposed from the hydraulic oil. The suction is interrupted, and by repeating this, the hydraulic oil is intermittently sucked up, and the sucked up hydraulic oil is passed through the oil separation filter 4.
After being temporarily stored in the tank 6 , the oil is returned to the tank 48 and used again as hydraulic oil for driving the hydraulic cylinder 5 . At this time, it is possible to judge the degree of leakage from the amount of hydraulic oil accumulated in the oil separation filter 46, and it is possible to accurately know when to replace the O-ring 26.

In this embodiment, the hydraulic oil accumulated in the oil pan 30 is removed during the painting operation to prevent the painting efficiency from decreasing. This may be performed with the receiving portion 30 stopped at an elevated position.

Similarly, in this embodiment, the suction port 32 of the suction pipe 31 is fixed so that it cannot move up and down, so that hydraulic oil is sucked up only when the oil receiver 30 is raised.
Instead of this, the suction pipe 31 may be, for example, a spirally wound flexible tube with a sufficient length so that the suction port 32 moves up and down together with the oil receiver 30 so that the suction pipe 31 always remains in the oil receiver.
In this case, there is an advantage that the hydraulic oil can be efficiently drained without reducing the painting efficiency.

Effects of the Invention As specifically explained in the above embodiment, the hydraulic lifting device for a rotary disk type electrostatic coating machine of the present invention removes the hydraulic oil leaking from the cylinder and collecting in the oil receiver. Since the pump device is driven to suck up the oil through the suction pipe from the suction port located in the receiver, there is no need to interrupt painting during extraction work, which prevents a drop in painting work efficiency and improves operation efficiency. Since oil does not adhere to the coating machine and mix into the paint, it is effective in preventing paint defects.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of one embodiment of the present invention;
The figure is a partially omitted sectional view. 5... Hydraulic cylinder, 6... Rod, 9... Rotating disc type electrostatic coating machine, 30... Oil receiver, 31...
Suction pipe, 32... Suction port, 40... Pump device,
A...Painting booth.

Claims (1)

[Scope of utility model registration request] A rotating disk-type electrostatic sprayer that discharges paint in the form of a mist from the periphery of a rotating disk is fixed to the lower end of a rod that protrudes freely from the lower end of a hydraulic cylinder that is fixed in an upright position above the painting booth. In the hydraulic lifting device for a rotary disc type electrostatic coating machine, an oil receiver for storing hydraulic oil leaked from the hydraulic cylinder is attached to the rod, and at least when the oil receiver is raised, the suction port is connected to the oil receiver. 1. A hydraulic lifting device for a rotary disc type electrostatic coating machine, characterized in that a suction pipe is provided inside the machine, and the suction pipe is connected to a discharge pump.