JP3523766B2 - Abnormal operation alarm for elevator type automatic plating equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a warning device for an abnormal rising operation of an elevator type automatic plating apparatus. 2. Description of the Related Art In an elevator type automatic plating apparatus, as shown in FIG. 1, an elevator platform 4 having a hanger 3 is attached to a plurality of guide columns 2 running along a processing tank 1, respectively.
Each hanger 3 is raised and lowered by a hoist beam 5. As shown in FIG. 2, the guide column 2 circulates between the sprockets 6 on both sides and travels. Therefore, the hoist beam 5 is also provided annularly along this circulation path as shown in FIG. 3 are raised and lowered at the same time. A work W is hung on the tip of a hanger 3 and traverses horizontally at an ascending position.
The plating is automatically performed during one round of the path shown in FIG. For this reason, the hoist beam 5 is lifted by the hydraulic mechanism 7 to a predetermined height, and it is necessary to keep the position during the traversing operation of the hanger 3. Therefore, conventionally, as shown in FIGS. 1 and 3, an ascending limit switch 8a (for ascending stop) and an ascending limit switch 8b (for ascending and slowing) for detecting the ascending limit of the hoist beam 5 are the main pillars. 9 to detect the rising height of the hoist beam 5. These ascending limit switches 8 have a role of regulating the maximum ascending height of the hoist beam 5 and a role of detecting whether or not the hoist beam 5 maintains the height during the traversing operation of the hanger 3. It has. When the height of the hoist beam 5 is reduced during the horizontal movement of the hanger 3 due to defective packing of the hydraulic mechanism 7 or the like, the emergency stop device is immediately activated to stop the entire plating apparatus. This is because, if the hanger 3 performs the traversing operation at a position lower than the predetermined height, a serious accident such as a collision with the partition wall of the plating tank 1 is caused. However, if the work W is left in the air for a long time with the emergency stop, troubles such as corrosion of the work W occur. Therefore, conventionally, when the emergency stop device operates during the traversing operation, the worker hastily switches to the manual operation without knowing the cause of the failure, and manually performs the traversing operation and the descending operation of the hanger 3. However, in many cases, the height of the hoist beam 5 cannot be immediately recovered by manual operation. In this case, there is a possibility that the plating line will be stopped for a long time until the cause of the failure is clarified and repaired. SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and performs an emergency failure avoidance operation even when the height of the hoist beam is reduced during the traversing operation of the hanger. The present invention has been made in order to provide a lift operation abnormal alarm device for an elevator type automatic plating apparatus which can prevent the stop of the plating line by automatically performing the above operation. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an ascending limit switch for detecting an ascending limit of a hoist beam for lifting and lowering a hanger;
It is characterized by including a hydraulic mechanism for automatically raising the hoist beam again immediately when the ascending limit switch is turned off during the horizontal movement of the hanger, and a failure alarm. According to the present invention, when the ascending limit switch detects a decrease in the height of the hoist beam during the traversing operation of the hanger, the hydraulic mechanism automatically immediately raises the hoist beam again. Avoidance is possible, and the operation can be continued as it is, for example, until the end of one day of work. At the same time, since the failure alarm indicates the failure of the hydraulic mechanism, it may be repaired after the work is completed. Preferred embodiments of the present invention will be described below. As already described with reference to FIGS. 1 to 3, the elevator-type automatic plating apparatus includes a hoist beam 5 for simultaneously moving up and down many hangers 3. The hoist beam 5 is connected to a hydraulic mechanism 7 such as a hydraulic cylinder via a chain 10. In the present invention, the ascending limit switch 8 for detecting the ascending limit of the hoist beam 5 is connected to the control device 11 and performs the following control. That is, if the height of the hoist beam 5 decreases during the traversing operation of the hanger 3 due to a packing failure of the hydraulic mechanism 7 or the like, the ascending limit switch 8 is turned off. Instead, the traverse operation of the hanger 3 is temporarily stopped, and a new hydraulic pressure is supplied to the hydraulic mechanism 7 to immediately raise the hoist beam 5 again automatically. Then, when the ascending limit switch 8 is turned on, the re-elevation of the hoist beam 5 is stopped, and the automatic operation such as the horizontal movement of the hanger 3 is continued. Further, when the height limit switch 8 detects that the height of the hoist beam 5 has decreased during the traversing operation of the hanger 3, the failure alarm 12 causes a failure of the hydraulic mechanism 7. Show that. The number of times the height of the hoist beam 5 is lowered is determined by the counter 13.
It is preferable that the maintenance inspection indicator lamp 14 be turned on when the predetermined number of times has been reached to urge the serviceman to perform maintenance inspection of the hydraulic mechanism 7. As described above, according to the present invention, as soon as the ascending limit switch 8 is turned off, the hoist beam 5 is turned off.
Is automatically re-elevated, but the time required for re-elevation is predictable. Then, after the ascending limit switch 8 is turned off, the ascending limit switch 8
It is preferable to count the time required to return to the ON state by the timer 15, and if the ascending limit switch 8 does not turn on within the set time, it is preferable to operate the emergency stop and sound the buzzer. As described above, according to the present invention, even if the height of the hoist beam is reduced during the traversing operation of the hanger, the apparatus is not stopped as in the prior art, but the emergency stop is performed. By automatically raising the hoist beam again, the automatic operation can be continued and the stop of the plating line can be prevented. In addition, since the failure alarm indicates that a failure has occurred in the hydraulic mechanism, there is an advantage that repair can be easily performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial sectional view of an elevator type automatic plating apparatus. FIG. 2 is an overall plan view of the elevator-type automatic plating apparatus. FIG. 3 is a front view of an elevator type automatic plating apparatus. [Description of Signs] W Work 1 Processing tank 2 Guide column 3 Hanger 4 Lifting table 5 Hoist beam 6 Sprocket 7 Hydraulic mechanism 8 Lift limit switch 9 Main column 10 Chain 11 Controller 12 Failure alarm 13 Counter 14 Maintenance inspection indicator light 15 Timer

Claims (1)

(57) [Claims] 1. An ascending limit switch for detecting an ascending limit of a hoist beam for elevating and lowering a hanger, and when the ascending limit switch is turned off during the traversing operation of the hanger. A lift operation abnormality alarm device for an elevator type automatic plating apparatus, comprising: a hydraulic mechanism for automatically raising the hoist beam immediately and a failure alarm.