JPS6318462Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a liquid coating device, and particularly to a liquid coating device suitable for coating a cylindrical member with a highly viscous liquid such as a carburization inhibitor. It is.

[Conventional technology]

For example, worm shafts used in power steering devices are heat treated to improve their strength, but after heat treatment, they must be machined, such as by drilling holes. To prevent heat treatment from being performed on parts that require machining after heat treatment, a carburization inhibitor is applied to the parts. Conventionally, this application process was done manually, or the carburization inhibitor was applied by immersing only the tip of the workpiece in a liquid bath.

[Problem that the invention aims to solve] However, when applying a highly viscous liquid such as a carburization inhibitor to a cylindrical part such as a wormshaft, simply immersing it in the liquid will cause the outer surface to dry in a short period of time. Although it can be applied, it takes time for the liquid to rise on the inner surface, and it is difficult to apply the liquid to a predetermined position, resulting in variations. The parts that are not coated with carburization inhibitor are hardened by heat treatment, which makes subsequent machining difficult, leading to problems such as drill damage or crooked holes. It was happening.

The present invention was developed to eliminate these drawbacks, and provides a liquid coating device that can uniformly apply a highly viscous liquid such as a carburization inhibitor to the inner and outer surfaces of a cylindrical member in a short time. It is something to do.

[Means for solving problems]

The liquid coating device according to the present invention includes a liquid tank that stores a highly viscous liquid such as a carburization inhibitor, and a saucer with a nozzle protruding from the bottom that is open above the liquid surface of the liquid tank. , a liquid injection mechanism provided at the other end of the tube connected to the lower end of the nozzle and positioned in the liquid tank for pushing and feeding the liquid in the liquid tank to the nozzle; and a liquid injection mechanism for pushing and feeding the liquid in the liquid tank to the nozzle; The present invention is characterized by comprising a workpiece holding mechanism that is inserted into the nozzle of the workpiece and is immersed and suspended in the supplied liquid in the saucer.

[Effect]

In the liquid coating device according to the present invention, liquid is sprayed from a nozzle inserted into a workpiece, and the liquid is evenly applied to the inner surface of the workpiece in a short time.

〔Example〕

The present invention will be explained below based on the illustrated embodiments.
FIG. 1 shows a liquid coating device for coating a carburization inhibitor on one end of a wormshaft used in a power steering device. 2 is a liquid tank in which carburization prevention liquid A is stored; 4 is a saucer disposed such that the upper surface 4a is located above the liquid level B in the liquid tank 2; 6 is a hole provided on the lower surface of the saucer 4. The tube 6 has one end 6a attached to the tube 4b, and the other end 6b of the tube 6 is opened into the liquid A. 8 is a nozzle arranged such that its lower end 8a is fitted in the hole 4b and the end 6a of the tube 6 in a liquid-tight manner, and its upper end 8b is located above the upper surface 4a of the saucer 4. By rotating the propeller 10 disposed within the other end 6b of the tube 6,
The liquid A in the liquid tank 2 passes through the tube 6 and is sprayed from the nozzle 8.

This propeller 10 includes a pulley 14 fixed to its rotating shaft 12 and a drive shaft 18 of a variable motor 16.
It is rotationally driven by a variable motor 16 via a belt 24 wound between a pulley 20 provided at the center and a pulley 22 located in the middle thereof.

On the other hand, above the receiving tray 4 is a workpiece holder 2.
6 is provided. The workpiece holder 26 is raised and lowered by an air cylinder 28, and the workpiece 30 held by the workpiece holder 26 is lowered by the air cylinder 28 into the liquid A in the saucer 4. A predetermined amount of water is immersed in the liquid.
The air cylinder 28 is connected to an air tank (not shown) via a three-way solenoid valve 32, and a timer 34 controls the immersion time of the workpiece 30.

A case will be described in which the liquid coating device having the above configuration is used to apply carburization prevention liquid A to a portion of the wormshaft that will require machining later. First, the workpiece 30 is attached to the workpiece holder 26 above the receiving tray 4, and the air cylinder 28
The lower end portion 30a is immersed in the carburization prevention liquid A in the saucer 4. At this time, the liquid A in the saucer 4 is filled up to the upper surface 4a of the saucer 4.
The amount of coating on the outer surface of the workpiece 30 is set based on the upper surface 4a of the receiving tray 4. Next, the propeller 10 is rotated by the variable motor 16, and the liquid tank 2 is rotated.
The carburizing prevention liquid A in the inside is passed through the tube 6 to the nozzle 8.
The liquid A is applied to the inner surface of the workpiece 30 by spraying it from the liquid A. The remaining applied liquid A enters the tray 4, and the portion that exceeds the upper surface 4a of the tray 4 overflows and returns to the liquid tank 2. After a predetermined period of time has elapsed, the workpiece 30 is raised by the air cylinder 28 to complete the coating process. By injecting the liquid A onto the inner surface of the workpiece 30 using the nozzle 8 in this manner, the liquid can be applied to a predetermined height in a short time. Further, by providing the saucer 4, even if the liquid level B in the liquid tank 2 decreases after each application, the liquid level in the saucer 4 remains constant and coating can always be made at the same height. Moreover, since the liquid A is injected from the nozzle 8 by the propeller 10 and caused to overflow from the saucer 4, the liquid A in the liquid tank 2 is constantly stirred, and the film thickness applied to the workpiece 30 is constant. It is also possible to obtain the effect that The amount of coating on the outer surface of the workpiece 30 is the lower end 3 of the workpiece 30.
Although it is determined by the depth of immersion into the receiving tray 4, the amount of coating on the inner surface can be determined by adjusting the height of the nozzle 10 or the rotation speed of the variable motor 16.
It can be adjusted by changing the ejection height, etc.

Note that the elevating mechanism for elevating and lowering the workpiece holder may be a mechanism other than an air cylinder, and the liquid ejecting mechanism is not limited to the one that rotates a propeller using a variable motor as described above. Furthermore, the liquid coating device having the above structure can of course be applied to cylindrical workpieces other than wormshafts, and also has similar effects on high viscosity liquids other than carburization prevention liquids.

[Effect of idea]

As described above, according to the present invention, a highly viscous liquid can be applied to the inner surface of a cylindrical workpiece in a short time and up to a certain height. Furthermore, the amount of coating on the inner surface relative to the outer surface can be set arbitrarily.
Furthermore, since the liquid in the liquid tank is constantly stirred, the thickness of the film applied to the workpiece can be kept constant.

Furthermore, since the apparatus can be constructed by incorporating the saucer, the injection mechanism, etc. in a single liquid tank, an efficient and compact apparatus can be obtained without requiring external piping.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of a liquid applicator according to an embodiment of the present invention. A...liquid, 2...liquid tank, 8...nozzle, 10
...Liquid injection mechanism, 26...Work holding mechanism, 30
...A cylindrical workpiece.

Claims (1)

[Scope of utility model registration request] A liquid tank that stores high viscosity liquid such as carburization inhibitor,
A saucer is disposed open above the liquid surface of the liquid tank and has a nozzle protruding from the bottom surface, and a tube connected to the lower end of the nozzle and positioned within the liquid tank is provided at the other end of the liquid tank. a liquid injection mechanism that pushes and feeds the liquid in the container to the nozzle; and a work holding mechanism that inserts a cylindrical workpiece through the nozzle in the saucer and suspends it by immersing it in the liquid to be fed in the tray. A liquid application device featuring an octopus.