JPH0574744U - Automatic opening / closing door with sub-door for safety confirmation - Google Patents

Abstract

(57) [Summary] [Purpose] Preventing accidents resulting in injury by configuring the automatic opening / closing door for the cutting fluid and cutting chips of machine tools with the safety confirmation sub-door and the main door. [Structure] A small and lightweight sub-door 9 is provided in an openable and closable manner in parallel with a main door 3 that covers an openable and closable opening for work between a headstock 1 and a full-face cover 2, and a main door air cylinder is provided. Air cylinder 11 with less thrust than 5
Thus, the sub door is opened and closed, and the closing operation of the main door starts after the sub door closing completion signal is output from the limit switch LS2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic opening / closing door having a safety confirmation sub-door for preventing an operator from being injured by being caught in a relatively large and heavy automatic opening / closing door.

[0002]

[Prior Art]

 In recent machine tools, since the amount of chips generated by heavy cutting increases and a large amount of cutting fluid is used, as shown in FIG. Therefore, the automatic opening / closing door 102 is large and heavy, and an air cylinder for opening / closing the door having relatively large thrust is used. Therefore, if a worker is accidentally caught in the door, there is an increased risk of personal injury due to the inertial force of the door and the thrust of the cylinder. Conventionally, as a measure for preventing this kind of accident, an optical sensor provided with light emitter 104 and light receiver 105 facing each other is used to prevent the operator from blocking the light and preventing the air cylinder from operating during the work inside the machine. There is.

[0003]

[Problems to be solved by the device]

 In the conventional accident prevention measures using optical sensors, if the sensor does not detect the worker at the time the door closing signal is output, the door closing operation will start. There is a problem that the operator cannot be suddenly stopped because of being caught. The present invention has been made in view of such problems of the conventional technology, and an object thereof is to provide an automatic opening / closing door with a sub-door for safety confirmation in which a malfunction does not lead to a personal injury. Is.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, an automatic opening / closing door with a safety confirmation sub-door according to the present invention is an automatic opening / closing door for a cutting fluid and chip cover of a machine tool, which is smaller and / or lighter than the automatic opening / closing door. The opening and closing door is provided in parallel and openable and closable, the driving means for opening and closing the sub door is provided, and the control means is provided for closing the opening and closing door after confirming that the sub door is closed. ..

[0005]

[Action]

 First, after confirming that the sub-door is completely closed without contacting the worker, the automatic opening / closing door is closed, so even if the sub-door hits the worker, the inertial force is small due to its small size and light weight. Is small, and because the thrust of the air cylinder is small, it stops easily and there is no confirmation signal, so the large automatic door does not close.

[0006]

【Example】

 An embodiment will be described with reference to FIGS. A well-known NC lathe is equipped with a full-face cover 2 for preventing cutting fluid and chip scattering that is open only on the left end on the right side. Between the headstock 1 and this full-face cover 2, the top face and front face are the work pieces. It is open for work such as attachment and detachment and setup. The main door 3 covering this opening is provided so as to be movable along a Z-axis guide rail (not shown). The main door air cylinder 5 is located below the front headstock 1 of the base 4 in the Z-axis direction. It is fixed in the right direction. The tip of the piston rod 6 of the air cylinder 5 is fixed to the main door 3 via a connecting tool 7, and by switching the pressure air supplied to the air cylinder 3, the open position of the front face of the headstock 1 and the above-mentioned position. The limit switch LS1 fixed to the lower end of the main cover 3 contacts the fixed dog 8 on the base 4 and outputs a closing completion signal when it is moved to the closed position covering the open part and the closing is completed. There is.

On the other hand, a small sub-door 9 made of a light material such as a synthetic resin or a light metal is provided on the front end surface of the entire surface cover 2 so as to be movable along a Z-axis guide (not shown). An air cylinder 11 for the sub door is fixed to the right side in the Z-axis direction at a lower position on the front surface 4 of the front cover 4 of FIG. The tip of the piston rod 12 of the air cylinder 11 is fixed to the sub door 9 through the mounting bracket 13, and the sub door 9 switches the pressurized air supplied to the air cylinder 11 to the standby position on the front side of the front cover 2 and the front surface of the open portion. A limit switch LS2 and a dog 12, which are moved to a safety confirmation position that covers only the safety detection position and detect completion of movement to the safety confirmation position, are fixed to the front surface of the front cover 2 and the sub door 9. The air cylinder 11 has a small cylinder diameter because the sub door 9 is lightweight and small and does not require a large thrust. Therefore, even if the sub door 9 comes into contact with the operator during movement, it will stop easily. In addition, safety measures such as R chamfering are taken on the edge of the sub door itself for safety.

Next, the operation of this embodiment will be described in the order of the flowchart of FIG. When a door closing command is issued by operating the NC device or the start button in step S1, pressurized air is supplied to the rear chamber of the air cylinder 11 in step S2, and the safety confirmation sub-door is closed first. In step S3, it is confirmed whether or not the sub-door is completely closed. If the confirmation signal is output from the limit switch LS2, the determination is YES, the process proceeds to step S4, and if the confirmation signal is not output, the determination is NO and the process is returned to step S2. It Next, in step S4, pressurized air is supplied to the rear chamber of the air cylinder 5 to close the main door 3. At this time, the sub door 9 is pushed by the main door 3 and returned to the standby position. Next, in step S5, it is confirmed whether or not the main door has been closed, and if a confirmation signal is output from the limit switch LS1, the confirmation signal switches the pressure air to the air cylinder 11 and clamps it at the standby position, resulting in YES. And finish. If the confirmation signal is not output, NO is returned to step S4.

[0009]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. Before closing the automatic opening / closing door, the small and lightweight sub-door was closed, and after confirming that there was no worker in the door closing range, the automatic opening / closing door was closed, so that the operator could be caught in the sub-door. However, the movement of the sub door can be stopped easily and it will not cause personal injury. In addition, a visual warning will be given to another worker outside the machine, so it is possible to expect corrective action by the worker outside the machine, further improving the safety effect.

[Brief description of drawings]

FIG. 1 is a perspective view of a lathe having an automatic opening / closing door with a safety confirmation sub-door according to the present embodiment.

FIG. 2 is a flow chart for explaining the operation of the present embodiment.

FIG. 3 is a perspective view of a conventional lathe having an optical sensor for safety confirmation of an automatic door.

[Explanation of symbols]

1 Headstock 2 Full Cover 3 Main Door 5,11 Air Cylinder 9 Sub Door 8,12 Dog LS1, LS2 Limit Switch

Claims (1)

[Scope of utility model registration request] 1. An automatic opening / closing door for a cutting fluid / swarf cover of a machine tool, wherein a sub door smaller and / or lighter than the automatic opening / closing door is provided in parallel and openable / closable with respect to the automatic opening / closing door. An automatic opening / closing door with a sub-door for safety confirmation, comprising drive means for opening and closing, which has a small thrust, and control means for closing the opening / closing door after confirming that the sub-door is closed.