JPS63160919A - Lubricating oil supply method for chain conveyor device - Google Patents

Abstract

PURPOSE:To prevent surplus or shortage of lubricant supply to be made by a chain conveyor serving in high temp. atmosphere by controlling supply of lubricant in accordance with the load current of a motor. CONSTITUTION:When a chain conveyor is operated, the load current of a motor 3 is sensed by a current sensor 6, and the sensed value Ik is given to a control device 5. The control device 5 compares the fed sensed value of current Ik with the reference value for judgement. When the sensed value Ik reaches the reference value, it is judged that wear of conveyor chain 2 becomes large, and a command of lubricant supply is given to an oil supply device 4 for a certain period of time. According to this constitution, the lubricant supplied can be prevented from any surplus or shortage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for supplying lubricating oil to a chain conveyor device used in a high-temperature atmosphere.

(Prior Art) As a conventional chain conveyor device of this type, there is a chain conveyor device that conveys wave-dried material in a high-temperature furnace for drying paint, for example. In this device, a conveyor chain is provided to run in a high-temperature furnace, and this conveyor chain is driven by an electric motor. Therefore, in this device, in order to prevent wear of the conveyor chain, lubricating oil is supplied to the chain.This method of supplying lubricating oil is usually carried out when the conveyor chain is driven, that is, during operation. At times, it is common to supply lubricating oil continuously.

(Problems to be Solved by the Invention) However, in the continuous lubrication method described above, the supply of lubricating oil tends to be excessive, and chain lubricating oil for high-temperature specifications is extremely expensive, which increases the economic burden. .

As a countermeasure to this problem, there is a method of supplying lubricating oil every certain period of time, but in the case of this intermittent lubrication method, it is difficult to set the supply amount per hour and the time interval, and depending on the setting, the lubricating oil supply may be Sometimes the amount was too small.

Further, in any of the above methods, it is not possible to follow the fluctuations in the amount of conveyance load applied to the conveyor chain, and there is still a problem that the amount of supply is excessive or insufficient.

The present invention has been made in view of the above circumstances, and it is possible to appropriately control the amount of lubricating oil supplied to the conveyor chain.
Moreover, it is an object of the present invention to provide a lubricating oil supply method for a chain conveyor device that can cope with fluctuations in the conveyance load applied to the conveyor chain.

[Structure of the Invention] (Means for Solving the Problems) The present invention detects the load current of a motor for driving a conveyor chain, and controls the supply of lubricating oil to the conveyor chain based on the detected value. ing.

(Function) Factors that change the load current of the motor include structural factors of the conveyor device itself such as running resistance of the conveyor chain,
Examples of such factors include fluctuations in the amount of conveyance load applied to the conveyor chain. The degree of wear on the conveyor chain varies depending on the running resistance, the amount of conveyance load, etc., and the amount and timing of supply of lubricating oil must be changed depending on the degree of wear.

Therefore, the load current of the electric motor can be used as a determination target for lubricating water supply control. Therefore, the present invention detects the load current of the electric motor and controls the supply of lubricating oil based on the detected value, so that the conveyor device itself can appropriately control the lubricating oil required for structure 1) and convey Control can also be performed according to changes in load amount.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

First, the schematic structure of the chain conveyor device will be described based on FIG. 1 is a high temperature oven for drying in the painting process;
In this case, dry the outer box of the refrigerator door. A conveyor chain 2 is provided to run inside the high temperature furnace 1 and is driven by a three-phase induction motor 3.

The door outer box, which is the object to be dried, is suspended or placed on the conveyor chain 2 and conveyed. Reference numeral 4 denotes an oil supply device, which is arranged to supply lubricating oil to the conveyor chains 2, 2, as also shown in FIG. 5 is a control device that drives and controls the oil supply device 4. Reference numeral 6 denotes a current detector comprising, for example, a current transformer, which detects the load current of the motor 3 and provides the detected value Ik to the control device 5.

Now, the second control device R5 determines the reference value Is for determining the start of refueling for the detection value 1k given from the current detector 6.
is set by converting it into a current value.

Thus, the control device 5 functions as follows during operation of the chain conveyor device. During this operation, the load current of the motor 3 varies depending on the running resistance of the conveyor chain 2 and the amount of conveyance load applied to the chain 2. Then, depending on the running resistance and conveyance load amount, the conveyor chain 2
The degree of wear also changes. Then, the current detector 6 sequentially provides the detected value Ik to the control device 5, and the control circuit 5 compares this detected value 1 with the reference value Is for judgment, and as shown in FIG. When the detected value 1k reaches the reference value ■S, that is, when the load current of the motor 3 increases, it is determined that the degree of wear on the conveyor chain 2 is increasing, and a refueling execution signal is sent to the lubricator 4. For example, give it at a predetermined time. The oiler 4 supplies lubricating oil to the conveyor chain 2.2 at its predetermined time. With this,
Abrasion of the conveyor chain 2 is prevented. Thereafter, as the lubricating action of the lubricating water decreases, the load on the motor 3 increases and the load current increases, but when the detected value Ik reaches the reference value Is, the lubricating oil is applied to the chain 2 in the same manner as described above. is supplied to

Here, when the amount of transported load changes, the load current of the electric motor 3 changes accordingly. For example, when the amount of transported load increases, the load current also increases. Therefore, when the load current fluctuates, the fluctuation is reflected in the detected value 1. And the detected value! When k reaches the reference value Is, lubricating oil is supplied for a predetermined period of time, and lubricating oil can be supplied in accordance with the amount of conveyed load.

In Example 1-, lubricating hot water was supplied for a predetermined period of time, but an upper limit and a lower limit were set for the judgment reference value Is for the detected value of load current 1k, and the upper limit was exceeded. By the way, it is also possible to start refueling and then stop the refueling once the lower limit value has been reached.
In short, the supply of lubricating oil may be controlled based on the detected value 1k of the load current.

[Effects of the Invention] As is clear from the above description, the present invention can appropriately control the supply of lubricating oil to the conveyor chain, and furthermore,
It can also be controlled in accordance with fluctuations in the amount of conveyed load, and therefore the amount of expensive lubricating oil used can be kept to the minimum necessary, resulting in excellent effects such as a significant reduction in costs.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. m1 is a side view showing the schematic configuration of the chain conveyor device, Fig. 2 is a front view showing an enlarged view of the oil feeder section, and Fig. 3 shows changes in load current. It is a diagram. In the figure, 1 is a high temperature furnace, 2 is a conveyor chain, 3 is an electric motor, 4 is an oil feeder, 5 is a control device, and 6 is a current detector.

Claims (1)

[Claims] 1. A method for supplying lubricating oil to a chain conveyor device for supplying lubricating oil to a conveyor chain when a conveyor chain installed to run in a high-temperature atmosphere is driven by an electric motor to convey a conveyed object, the method comprising: A method for supplying lubricating oil to a chain conveyor device, characterized in that a load current of an electric motor is detected, and the supply of lubricating oil to a conveyor chain is controlled based on the detected value.