JPH0857381A - Coating method and coating apparatus - Google Patents

Abstract

PURPOSE: To provide a coating method and apparatus by which a surface to be coated can be coated in a required thickness with a coating material such as grease, etc., irrespective of the change of viscosity of the coating material. CONSTITUTION: A feeder 15 is filled with the coating material by a filling means 35 and nozzles 29 for discharging the coating material and a surface to be coated are relatively moved by using a driving device 11. Linked with this relative movement, an exturding member 12a of another feeder 12 is moved by a specific moving amount with an interlocking means 13. The corresponding amount of the coating material to the moving amount of an extruding member 15a of the feeder 15 is extruded and supplied to the nozzles 29 by using the feeder 15. Thus, with the interlocking means 13, the relative movement and the movement of the extruding member 15a can be performed at respective constant speeds.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for applying a coating agent such as grease or lubricating oil to a surface to be coated such as a roll shaft of a rolling roll in a rolling mill.

[0002]

2. Description of the Related Art As shown in FIG. 6, a rolling roll 1 installed in a rolling mill has both ends supported by bearing chocks 2, and a roll shaft 3 protruding from the chock 2 has a coupling 4. It is connected to the speed reducer 5 of the motor 6 via. This rolling roll 1 has a roll shaft 3 and a coupling 4 when a replacement due to damage or a periodic maintenance inspection is performed.
It is taken out of the factory and moved to a repair shop. When this rolling roll 1 is installed in the rolling mill again, the roll shaft 3 is fitted into the coupling 4 after applying grease over substantially the entire circumferential surface thereof.

When the grease is applied to the surface to be coated such as the roll shaft 3 at present, it is not easy to apply the grease to the surface to be coated to have a uniform thickness because it is performed manually. Therefore, by filling the measuring cylinder with grease and operating the piston for a set stroke, a liquid fixed amount supply device that supplies a predetermined amount of grease to be applied to the surface to be applied by discharging from a nozzle (for example, actual open flat 1-82).
It is conceivable to use (see Japanese Patent Publication No. 199).

[0004]

However, this liquid constant quantity supply device does not cause a problem when a predetermined amount of grease or lubricating oil is filled in a bearing or the like having a constant volume, but the roll shaft 3 or the like described above is used. When grease or the like is applied to the surface to be coated having a constant coating width with a uniform thickness as described above, the following problems occur. That is, when grease is applied to the entire peripheral surface of the roll shaft 3 while moving the nozzle for discharging the grease in the axial direction of the roll shaft 3 at a constant speed, not only can a necessary fixed amount (total amount) of grease be supplied, It is necessary to constantly discharge this fixed amount of grease from the nozzle at a constant flow rate. However, the viscosity of grease and the like greatly changes according to the temperature change, and when the grease is supplied using the same supply device, the flow rate of the grease changes due to the temperature change of the grease within the room temperature range (5 to 30 ° C.). Fluctuates about 4 times. Therefore, when the nozzle is moved in the axial direction of the roll shaft 3 at a constant speed, the coating thickness per unit area of the roll shaft 3 becomes non-uniform due to the change in the flow velocity according to the temperature change of the grease.

Further, while the movement time required to move the nozzle at a constant speed with respect to the coating width of the roll shaft 3 is constant, the time required to supply a required fixed amount of grease is The difference greatly depends on the change of the flow velocity due to the temperature change. Therefore, when the viscosity of the grease becomes too high, the grease is applied with a thickness smaller than a predetermined value, and the grease continues to be discharged even after the movement of the nozzle is stopped, so that the grease is partly large on the roll shaft 3. It will be applied to the thickness. On the contrary, when the viscosity of the grease becomes too low, the coating thickness of the grease becomes too large, and the discharge of a certain amount of grease is completed before the nozzle has finished moving by the coating width, so that the grease is not applied to the roll shaft 3. Some areas are not applied at all. Therefore, it is conceivable to supply the grease while controlling the flow rate of the grease using a flow meter or the like so that the flow rate is always constant, but for that purpose, a complicated and highly accurate configuration is required, and the cost becomes high.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a coating method and a coating device having a simple structure and capable of coating a coating agent such as grease with a desired thickness on the entire surface to be coated irrespective of changes in its viscosity. To do.

[0007]

In order to achieve the above object, in a coating method according to the present invention, a coating agent is coated on an article while relatively moving a nozzle for ejecting the coating agent and a coated surface of the article. A coating method for coating on a coating surface, wherein the coating agent is filled in a feeder and the pushing member of the feeder is moved by a predetermined movement amount in conjunction with the relative movement, thereby the predetermined movement amount. The amount of the coating agent corresponding to is extruded from the feeder and supplied to the nozzle. The relative movement and the movement of the pushing member are preferably performed at a constant speed.

Further, the coating apparatus according to the present invention is an apparatus for discharging a coating agent from a nozzle to coat the surface to be coated of an article, and a drive device for relatively moving the nozzle and the surface to be coated, By the movement of the extruding member, a feeder for extruding an amount of coating agent corresponding to the movement amount to supply the nozzle, a filling means for filling the feeder with the coating agent, and the extruding device in association with the relative movement. Interlocking means for moving the member by a predetermined movement amount.

It is preferable that the interlocking means is configured to perform the relative movement and the movement of the pushing member at a constant speed. Further, the feeder may be configured to include a cylinder filled with the coating agent and an extruding member including a piston for pushing out the filled coating agent.

[0010]

According to the coating method or coating apparatus of the present invention, the coating agent is coated on the coating surface while the nozzle for discharging the coating agent and the coating surface of the article are moved relative to each other. For example, the coating agent is discharged from the nozzle onto the surface to be coated while moving the nozzle along the surface to be coated. The extruding member of the feeder filled with the coating agent is moved by a predetermined moving amount in association with the movement of the nozzle, and the coating agent of an amount corresponding to the predetermined moving amount is pushed out from the feeder and supplied to the nozzle. Therefore, if the nozzle is moving at a constant speed,
The push-out member is also moved at a constant speed in conjunction with this movement, so that the coating agent is always extruded from the feeder at a constant flow rate regardless of its viscosity and supplied to the nozzle. Therefore, an amount of the coating agent corresponding to the predetermined moving amount of the pushing member that is preset with respect to the moving amount of the nozzle is uniformly applied to the surface to be coated. Also, since the push-out member moves in conjunction only when the nozzle is moving, setting the amount of movement of the nozzle to the coating width of the coated surface will result in coating leakage on the coated surface or partial coating thickness. Does not increase.

Further, in the above-mentioned feeder, if the coating material filled in the cylinder is pushed out by the piston, it becomes simple and highly reliable.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing a coating apparatus according to an embodiment of the present invention. In this embodiment, FIG.
The case where grease (an example of a coating agent) is applied to the peripheral surface (an example of a coated surface) of the end of the roll shaft 3 shown in FIG. Therefore, since the rolling roll 1 having the roll shaft 3 is a heavy material and is not easily moved, in the embodiment of FIG. 1, the nozzle 2 is moved along the stopped roll shaft 3 (see FIG. 2).
9 is moved relatively. In FIG. 1, the nozzle 29 is attached to the nozzle rack 10.
Are placed on the carriage 11 and moved.

An air cylinder 12 is provided as an example of a drive device for the carriage 11 and the air cylinder 1 is provided.
The tip of the second piston rod 12b is the pin joint 13
It is connected to the connecting member 11a of the carriage 11 via.
A compressed air source 1 is provided in the left chamber of the air cylinder 12 in FIG.
4, when the compressed air is fed, the pressure of the compressed air moves the piston 12a to the right in FIG. 1, and the carriage 11 or the nozzle rack 10 is moved through the piston rod 12b.
Is moved to the right. At this time, the air in the right side chamber of the air cylinder 12 is discharged to the outside from the air breather 12c.

As an example of a feeder for supplying grease to a nozzle, a cylinder 15 having the same mechanism as a hydraulic cylinder is provided, and its piston 15a functions as a grease pushing member. Piston rod 1 of this piston 15a
The tip end of 5b is connected to the carriage 11 and the piston rod 12b of the air cylinder 12 via a pin joint 13 shown as an example of an interlocking device.

A grease storage tank 17 and a pump 16 are provided as a means 35 for filling the grease into the cylinder 15, and the grease storage tank 17 is operated by the operation of the pump 16.
When grease is filled into the cylinder 15 from the right side chamber in FIG. 1, the piston 15a moves leftward in FIG. 1 due to the pressure of the filled grease, and the piston rod 15
The carriage 12 and the piston 12a of the air cylinder 12 are pulled via b and moved to the left. At this time, outside air is introduced into the right side chamber of the air cylinder 12 from the air breather 12c, and air in the left side chamber of the cylinder 15 is discharged to the outside from the air breather 15c.

Further, the base of the operating rod 18 having an operating projection 18a at its tip is fixed to the pin joint 13. Corresponding to the operating protrusion 18a, the first and second limit switches 19 and 20 are provided opposite to each other at a predetermined interval, and the carriage 11, that is, the nozzle rack 10 is provided with the operating protrusion 1a.
8a is set so as to reciprocate within a range W in which both limit switches 19 and 20 are pressed and turned on.

The controller 21 detects the operation of each of the limit switches 19 and 20 and detects the operation of the first to third solenoid valves 2.
By controlling Nos. 2 to 24 based on a predetermined control sequence, switching of feeding and stopping of the compressed air to the air cylinder 12, filling of the cylinder 15 with grease and discharge of grease are controlled at predetermined timings. To do. This control will be described later.

FIG. 2A is a side view showing the relationship of relative movement between the nozzle rack 10 and the peripheral surface 3a at the end of the roller shaft 3 shown as an example of the surface to be coated, and FIG. (A)
2 is a sectional view taken along line II-II of FIG. The roll 1 and the carriage 11 are mounted on the same substrate B. The surface of the roller shaft 3 to be coated with grease, that is, the peripheral surface 3a of the end portion protruding from the chock 2 is fitted to the coupling 4 (FIG. 6) so as to be able to rotate integrally with the coupling 4 (FIG. 6). The nozzle rack 10 has an oval shape, and an opening 28 through which the oval roller shaft 3 is inserted with a predetermined gap in the nozzle rack 10.
A nozzle support frame 28 having a is installed.

The nozzle supporting frame 28 discharges grease 6 at substantially equal intervals in the circumferential direction of the roll shaft 3.
The nozzles 29 are arranged so that their respective discharge ports face the center of the opening 28a, that is, the roller shaft 3.

An air nozzle 30 for discharging compressed air is arranged between the adjacent nozzles 29 as required, and the nozzles 29 are
The grease discharged from the air nozzle 30 is spread thinly along the coated surface 3a by the compressed air discharged from the air nozzle 30, or
Alternatively, a two-fluid nozzle that atomizes the grease with an atomizing fluid such as compressed air may be used. Nozzle rack 10
Moves reciprocally in a range W between the solid line position and the two-dot chain line position in FIG. 2A, that is, between both ends of the coated surface 3a of the roller shaft 3. The moving range W of the nozzle rack 10 is set by the distance between the limit switches 19 and 20 as described above.

Next, the operation of the above embodiment will be described. When the air cylinders 12 and 15 are in the state shown by the solid line in FIG. 1, the nozzle rack 10 is shown in FIG.
Has stopped at the solid line position. In this state, the roll 1 approaches the nozzle rack 10 and the tip of the roll shaft 3 slightly enters the inside of the nozzle rack 10. As shown in FIG. 1, the controller 21 detects that the second limit switch 20 is turned on by the actuating projection 18a, and controls each of the solenoid valves 22 to 24 to the state shown in FIG.

That is, for the first solenoid valve 22,
The electromagnet 22c is energized and the valve position 22a is selected to open the valve. For the second solenoid valve 23, the electromagnet 23d is urged to select the valve position 23b, thereby supplying grease to the cylinder 15. Third solenoid valve 2
For 4, the air cylinder 12 is opened to the atmosphere via the air filter 40 by urging the electromagnet 24c to select the valve position 24a.

Therefore, the grease in the grease storage tank 17 starts to be filled in the cylinder 15 from the right side chamber thereof by driving the pump 16 through the main valve 25, the first solenoid valve 22 and the check valve 26. The pressure of this filled grease moves the piston 15a toward the left in FIG.
At this time, the air cylinder 12 is in a free state because the third solenoid valve 24 is open to the atmosphere, and the piston 12a of the air cylinder 12 and the carriage 11 are integrated with the piston 15a of the cylinder 15. Moved to the left.

When the piston 15a has moved to the position indicated by the chain double-dashed line in FIG. 1 and the cylinder 15 has been filled with more grease than is necessary to be applied to the roll shaft 3, as shown by the chain double-dashed line in FIG. The operating protrusion 18a turns on the first limit switch 19. The controller 21, which detects that the switch 19 is turned on, controls the solenoid valves 22 to 24 as follows.

That is, for the first solenoid valve 22,
The electromagnet 22c is deenergized, and the electromagnet 22d is energized to select the valve position 22b, thereby closing the valve. As a result, the supply of grease to the cylinder 15 is stopped. The second solenoid valve 23 is brought into an open state by deactivating the electromagnet 23d and activating the electromagnet 23c to select the valve position 23a. As a result, the grease in the cylinder 15 can be supplied to each nozzle 29 of the nozzle rack 10 through the second solenoid valve 23. For the third solenoid valve 24, the electromagnet 24c is deenergized and the electromagnet 2
The valve is opened by selecting the valve position 24b by urging 4d. Therefore, the compressed air from the compressed air source 14 starts to be fed from the left side chamber into the air cylinder 12 through the main valve 27 and the third solenoid valve 24.

Therefore, the piston 1 of the air cylinder 12
2a moves to the right from the position of the chain double-dashed line in FIG. 1 due to the pressure of the compressed air. The carriage 11 and the piston 15a of the cylinder 15 move rightward together with the piston 12a. An amount of grease corresponding to the moving amount of the moving piston 15a is discharged from the cylinder 15 toward the roller shaft 3 from each nozzle 29 through the second electromagnetic valve 23 and the grease discharge passage 41. Here, the feeding speed of the compressed air from the compressed air source 14 to the air cylinder 12 and the discharging speed of the air from the air breather 12c are determined by the piston 12
It is adjusted so that a moves at a constant speed.

Therefore, the piston 12a of the air cylinder 12 moves the carriage and the nozzle rack 10 at a constant speed, and also moves the piston 15a of the cylinder 15 at the same constant speed as the nozzle rack 10. That is, the grease in the cylinder 15 is pushed out of the cylinder 15 at a constant flow rate by the piston 15a that moves at a constant speed in conjunction with the movement of the nozzle rack 10, regardless of the viscosity due to the temperature, and the grease is discharged from the nozzle 29. Is ejected. Therefore, a certain amount of grease is applied to the roller shaft 3 per unit area, and the grease is applied with a substantially constant application thickness.

When the nozzle 29 is moved to the tip of the roller shaft 3 as shown by the solid line in FIG. 2 (a) and the coating on the entire coating width W of the roller shaft 3 is completed, the second limit switch 20 is turned on. It is turned on as shown by the solid line in FIG. As shown in FIG. 1, the controller that detects that the switch 20 is turned on opens the first electromagnetic valve 22 and closes the second and third electromagnetic valves 23 and 24. Due to the closed state of the third solenoid valve 24, the supply of compressed air to the air cylinder 12 is stopped, the carriage 11 is stopped, and the second solenoid valve 2
The discharge of grease is stopped by the closed state of No. 3, and the filling operation of the grease into the cylinder 15 becomes possible by the opened state of the first solenoid valve 22 to prepare for the next application to the roller shaft 3.

In the above grease application step, even if the moving speed of the nozzle base 10 changes due to the fluctuation of the flow velocity of the compressed air fed into the air cylinder 12, the moving speed of the nozzle base 10 becomes faster. As a result, the discharge amount of grease becomes large, and conversely, the discharge amount of grease becomes smaller in response to the slower moving speed of the nozzle base 10. Therefore, the coating thickness 3a of the roller shaft 3 is substantially uniform. Becomes Therefore, as described above, it is not necessary to control the flow velocity when the compressed air is supplied to the air cylinder 12 to be constant, and the coating device has high reliability while having a simple and inexpensive structure.

In the above operation, it is not necessary for the grease to use all of the filling amount in the cylinder 15 in one application operation.
The roller shaft 3 is filled with more grease than is necessary to apply the grease. In addition to the air cylinder 12, various other driving devices such as a structure for transmitting the rotation of the motor to the electric cylinder via a reduction gear may be used as the driving means of the carriage 11 having the nozzle rack 10 mounted thereon. it can.

FIG. 3 is a schematic configuration diagram showing a main part of another embodiment of the present invention. In the embodiment shown in FIG. 1, on the piston rod 12b of the air cylinder 12 for moving the carriage 11,
The piston rod 15b of the cylinder 15 that supplies grease to the nozzle 29 is directly connected to integrally move the carriage 11 on which the nozzle rack 10 is mounted and the piston 15a of the cylinder 15. Instead of this configuration, in FIG. 3, the piston rod 12b of the air cylinder 12 for moving the carriage 11 pivotally supports the other end of the link rod 32 whose one end is rotatably supported by the base 31. A piston rod 15b of a cylinder 15 for supplying grease to the nozzle 29 is connected to an intermediate portion of the link rod 32 via a pin joint 13. Other configurations such as a grease filling and supplying system and a discharging system and a compressed air supplying system are the same as those in FIG.

According to the structure shown in FIG. 3, the position where the piston rod 15b of the cylinder 15 is connected to the link rod 32 via the pin joint 13 is appropriately changed so that the pin joint 13 extends from one end of the link rod 32.
It is possible to adjust the ratio of the length L1 up to and the length L2 from the pin joint 13 to the other end. That is, the amount of movement of the piston 15a of the cylinder 15 with respect to the amount of movement of the nozzle 29 per unit distance, that is, the amount of discharge of grease from the nozzle 29 can be arbitrarily adjusted. On the other hand, in the embodiment of FIG. 1, the nozzle 29 and the piston 15 of the cylinder 15 are
Since a and a move together, the discharge amount of grease with respect to the movement amount of the nozzle 29 per unit distance is constant and cannot be adjusted. Therefore, although the coating thickness of grease is set by the moving speed of the nozzle 29, it is difficult to set the coating thickness of grease at the design stage. In the embodiment of FIG. 3, the above-mentioned inconvenience is solved by allowing the application thickness of grease to be arbitrarily adjusted at the time of installation.

FIG. 4 is a schematic side view showing still another embodiment of the present invention, and FIG. 5 is a schematic plan view of FIG. Link rod 3
The tip end of the piston rod 15b of the cylinder 15 is connected to the intermediate portion of 2 through the pin joint 13, and one end of the link rod 32 is pivotally attached to the base 31. This structure is similar to that of the embodiment of FIG. 3, but the other end of the link rod 32 is not directly connected to the carriage 11 or the air cylinder 12, and the operation receiving shaft 33 is connected to the link rod 32 from the other end of the link rod 32. It extends in a direction orthogonal to. On the other hand, trolley 1
In addition to the nozzle rack 10, a pressing base 34 having a notch 34a that engages with the operation receiving shaft 33 by the movement of the carriage 11 is mounted on the No. 1 unit.

When the dolly 11 moves from the solid line position in FIG. 4 to the two-dot chain line position and the notch 34 engages with the operation receiving shaft 33, the dolly 11 further starts moving leftward in FIG. At this time, the supply of grease from the cylinder 15 to the nozzle 29 is started. Therefore, the carriage 11 can be largely separated from the cylinder 15 to the right, and the inside of the nozzle rack 10 can be easily cleaned and inspected.

The cylinder 15 is filled with grease by
This is performed independently of the movement of the dolly 11. On the other hand,
And in the embodiment of FIG. 3, the piston 15 of the cylinder 15
a, the carriage 12 and the piston 12a of the air cylinder 12
Is integrally connected, it is difficult to largely separate the carriage 11 having the nozzle rack 10 from the roll shaft 3, and the carriage 11 moves in conjunction with the filling operation of grease into the cylinder 15. Therefore, if it is attempted to secure a sufficient amount of grease so as not to fall below the amount of one application onto the roll shaft 3, the amount of movement of the carriage 11 tends to increase, which tends to increase the application width W of the roller shaft 3. It can be difficult to set. The embodiment shown in FIGS. 4 and 5 eliminates the above-mentioned inconvenience, and moreover, similar to the embodiment shown in FIG. 3, there is an advantage that the discharge amount of grease per unit movement amount of the nozzle 29, that is, the discharge flow velocity can be adjusted. I have it.

The coating method and coating apparatus of the present invention can be applied not only to the application of grease to the roll shaft of the rolling mill described in the above embodiment but also to the application of lubricating oil or grease to various rotary shafts. Is.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a coating apparatus according to an embodiment of the present invention.

FIG. 2 (a) is a schematic side view showing the relative movement between the nozzle and the surface to be coated in the above embodiment, and FIG.
It is a sectional view taken along the line II.

FIG. 3 is a schematic side view showing a part of a coating apparatus according to another embodiment of the present invention.

FIG. 4 is a schematic side view showing a part of a coating apparatus according to still another embodiment of the present invention.

5 is a schematic plan view of FIG.

FIG. 6 is a side view showing a rolling roll to which the present invention can be applied to apply a coating agent.

[Explanation of Codes] 3 ... Roller shaft (applied surface), 12 ... Air cylinder (driving device), 13 ... Pin joint (interlocking device), 15 ... Cylinder (feeder), 15a ... Piston (pushing member),
29 ... Nozzle, 32 ... Link rod (interlocking means), 33 ... Actuating shaft (interlocking means), 34 ... Press base (interlocking means), 3
5 ... Filling means.

Front page continuation (72) Inventor Masayuki Hashimoto 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries Ltd.Kobe factory (72) Nobuaki Nomura, Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture Kawasaki Steel Manufacturing Co., Ltd. Chiba Steel Works, Steel Development & Production Headquarters (72) Inventor Hiroo Sakuma 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Kawasaki Steel Co., Ltd. Steel Development & Production Headquarters, Chiba Steel Works

Claims (5)

[Claims] 1. A coating method for coating a coating surface of an article with the coating agent while relatively moving a nozzle for discharging the coating agent and a coating surface of the article. An application method in which the pushing member of the feeder is moved by a predetermined amount of movement in association with the relative movement so that an amount of coating agent corresponding to the predetermined amount of movement is pushed out of the feeder and supplied to the nozzle. . 2. The coating method according to claim 1, wherein the relative movement and the movement of the pushing member are performed at a constant speed. 3. A device for discharging a coating agent from a nozzle to coat the surface to be coated of an article, wherein a drive device for relatively moving the nozzle and the surface to be coated, and a movement of the pushing member to move the driving member. A supply device that extrudes an amount of the coating agent corresponding to the amount and supplies the nozzle to the nozzle, a filling unit that fills the supply device with the coating agent, and moves the extrusion member by a predetermined movement amount in association with the relative movement. A coating device having an interlocking device. 4. The coating apparatus according to claim 3, wherein the interlocking device is configured to perform the relative movement and the movement of the pushing member at a constant speed. 5. The coating apparatus according to claim 3, wherein the feeder comprises a cylinder filled with a coating agent, and the pushing member comprises a piston for pushing out the filled coating agent.