JP2019048414A - Safety door of vertical injection molding machine - Google Patents

Abstract

To provide a safety door of a vertical injection molding machine which has a few limit switches and can reliably detect a closed state.SOLUTION: A safety door (4) of a vertical injection molding machine (1) is composed of a rectangular door (10) rotatably supported by hinges (13) at predetermined long sides, whose opposite side is opened and closed by drawing an arc. The safety door (4) includes a non-contact sensor (18) consisting of a detection unit (20) and a unit (21) to be detected. One of the detection unit (20) and the unit (21) to be detected is provided in the vicinity of the opposite side of the door (10). Then, the other is provided on a predetermined member (11). When the door (10) is closed, the unit (21) to be detected is detected by the detection unit (20), and the closed state of the safety door (4) is detected. The safety door (4) may be composed of a double door, in which case, the other of the detection unit (20) and the unit (21) to be detected is provided in the other door (11). A noncontact sensor (18) is preferably a magnetic proximity sensor (18).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a safety door of a vertical injection molding machine, and relates to a safety door consisting of a single-opening door of one door or a double-opening door of two doors.

  In the vertical injection molding machine, the safety of the operator is secured by enclosing the clamping device in the same manner as the horizontal injection molding machine. The enclosure is provided with a safety door, which can be opened and closed for maintenance by the operator if necessary. The safety door is provided with the necessary number of limit switches for detecting the open / close state thereof. For example, as described in Patent Document 1, when the safety door is opened during operation, it is detected and detected. It is designed to stop the servomotor or switch control.

JP 2000-37758 A

  By the way, the safety door provided in the vertical injection molding machine consists of a door that is opened and closed by a hinge and may be configured of a single-opening door consisting of a single door, and opening and closing like a double door from two doors There are also cases where it consists of a double door. A safety door consisting of a single-sided door or a double-sided door requires a predetermined number of limit switches for detecting the open / close state thereof, which will be described with reference to FIG. FIG. 3 shows a view from the inside of the safety door 50 consisting of a double-opening door, that is, from the side of the vertical injection molding machine. The left door 51 is rotatably supported by hinges 56 and 56 with respect to the support 53, and the right door 52 is rotatably supported by hinges 57 and 57 with respect to the fixed frame 54. Accordingly, the left and right doors 51 and 52 are opened in an unfolded manner toward the outside, that is, in the depth direction of the drawing. In such a safety door 50, limit switches 61, 62, ... for detecting the open / close state thereof are provided on the hinges 56, 57 side of the left and right doors 51, 52, respectively. More precisely, the hinges 56 and 57 are provided on the support post 53 and the fixed frame 54 provided thereon. When the left and right doors 51 and 52 open and close, the movable range of the doors 51 and 52 in the vicinity of the hinges 56 and 57 is small. Therefore, two types of limit switches 61 and 62 are used in combination to reliably detect the closed state. There is. First, the first limit switches 61, 61 are plunger type limit switches, and when the doors 51, 52 are closed, the plungers provided inside are pushed and turned on. That is, it is an A contact point which is turned on in the closed state. On the other hand, the second limit switches 62, 62 consist of lever type limit switches, and when the door is opened, the lever is driven to be turned on. That is, it is a B contact point which is turned off when the doors 51 and 52 are closed. As described above, the limit switches 61 and 62 are provided with movable portions including plungers and levers, and the movable portions directly contact the doors 51 and 52 to be driven and turned ON / OFF. In other words, the contact limit switches 61 and 62 are provided. Then, the two limit switches 61 and 62 are used in combination to reliably detect the closed state. For this reason, when the safety door 50 is a double door, a total of four limit switches 61 and 62 are required. The controller of the vertical injection molding machine permits the operation when the first and second limit switches 61 and 62 both detect that the doors 51 and 52 are in the closed state, and either one of the limits If the switches 61 and 62 can not detect the closed state, the operation of the vertical injection molding machine is stopped.

  Since the conventional safety door 50 provided in the vertical injection molding machine uses the two contact type limit switches 61 and 62 in combination, the closed state of the safety door 50 is reliably detected, and the worker's I can secure my safety. However, there are also problems to be solved. The first problem is the number of limit switches 61, 62 required. In general, safety doors do not have a lock mechanism and can be opened and closed even during operation, and so-called movable doors and so-called fixed doors that are locked by the lock mechanism and can not be opened and closed during operation There are two types, and the number of limit switches required is determined by regulations. For example, in the case of a fixed door, at least one limit switch may be provided for one safety door. In this case, only one limit switch should be sufficient to clear the regulation, but in the case of the double-door safety door 50, four limit switches 61 and 62 are required as described above. Even if only one of the first and second limit switches 61 and 62 is used while accepting that the accuracy of detection of the closed state is slightly reduced, two are required. Then, the cost required for the limit switch is large. The second problem is the problem of deterioration or failure. Since the limit switches 61 and 62 are of contact type and have movable parts, they deteriorate due to long-term use and cause failures. The third problem is that the limit switches 61 and 62 can not normally detect the closed state of the doors 51 and 52 when foreign matter such as dust is caught. If the closed state can not be confirmed, the vertical injection molding machine can not be operated, so the operator must once open the safety door 50 and perform an operation to close it again. When the safety door 50 is repeatedly opened and closed 1-2 times, dust and the like in the vicinity of the limit switches 61 and 62 are removed, and the closed state of the doors 51 and 52 can be detected. As described above, the closed state of the doors 51 and 52 may not be detected due to dust or the like, and in order to be able to operate the vertical injection molding machine, there is a problem that an operation of repeatedly opening and closing the doors 51 and 52 is required. is there. Furthermore, due to vibration caused by the operation of the vertical injection molding machine, it may be erroneously judged that the doors 51 and 52 have been opened. Then, the vertical injection molding machine abnormally ends.

  An object of the present invention is to provide a safety door of a vertical injection molding machine which solves the problems as described above. Specifically, the safety door comprising a single-sided door or a double-sided door is closed. The number of limit switches to detect is as small as possible, and the closed state can be detected reliably. There is virtually no problem with age deterioration or failure of the limit switch, and the detection of the closed state of the door is hindered by dust etc. It is an object of the present invention to provide a safety door of a vertical injection molding machine which has no possibility of malfunction even by vibration of operation of the vertical injection molding machine.

  In order to achieve the above object, the present invention is a wedge-shaped injection comprising a rectangular door which is pivotably supported by a hinge at a predetermined long side and whose opposite side is opened and closed in an arc. Intended for safety doors of molding machines. In the present invention, the safety door is provided with a non-contact sensor including a detection unit and a detection unit. One of the detection unit and the detection unit is provided in the vicinity of the opposite side of the door. Then, the other is provided on a predetermined member. When the door is closed, the detection unit detects the detection target and detects that the safety door is closed. The safety door may be composed of a double door, in which case the other of the detection unit and the detection unit is provided on the other door. The noncontact sensor is preferably a magnetic proximity sensor.

Thus, in order to achieve the above object, the invention according to claim 1 comprises a rectangular door which is pivotally supported by a hinge at a predetermined long side, and the opposite side is opened and closed in an arc. The safety door of the vertical injection molding machine according to claim 1, wherein the safety door includes a non-contact sensor including a detection unit and a detection unit, one of the detection unit and the detection unit being the detection unit. It is provided in the vicinity of the opposite side of the door, and the other is provided on a predetermined member, and when the door is closed, the detection unit detects the detection target and detects the closed state of the safety door. Configured as a safety door of a vertical injection molding machine characterized by
The invention according to claim 2 is the safety door according to claim 1, wherein the safety door is a double door comprising the door and another door, and the other door has a predetermined long side. It is rotatably supported by a hinge, and the opposite side is opened and closed by drawing an arc, and the other of the detection portion and the detected portion is near the opposite side of the other door. It is configured as a safety door of a vertical injection molding machine characterized by being provided.
The invention according to claim 3 is the safety door according to claim 1 or 2, wherein the noncontact sensor is a magnetic proximity sensor in which the detection unit is a coil and the detection unit is a magnet. It is configured as a safety door of a vertical injection molding machine characterized by

  As described above, according to the present invention, there is provided a vertical injection molding machine comprising a rectangular door which is pivotably supported by a hinge at a predetermined long side and whose opposite side is opened and closed in an arc. It is intended for safety doors. The safety door includes a non-contact sensor including a detection unit and a detection unit, one of the detection unit and the detection unit is provided in the vicinity of the opposite side of the door, the other is provided on a predetermined member, and the door is When it is closed, the detection unit detects the detection target and detects the closed state of the safety door. The safety door can be configured as a single-sided door or a double-sided door, but in any case, the sensor that detects the closed state is a non-contact sensor, and therefore there is no problem with aged deterioration or failure. And the number of sensors is only one. Then the cost is small. Furthermore, since the closed state can be detected in a noncontact manner, the influence of disturbance due to dust or the like is small. That is, the closed state can be detected accurately. Furthermore, since the closed state is detected in a non-contact manner, the state is not erroneously determined even by the vibration of the vertical injection molding machine. According to another invention, the safety door is a double door comprising a door and another door, wherein the other door is pivotally supported by a hinge at a predetermined long side, and the opposite side is opened and closed in an arc. The other of the detection unit and the detection unit is provided in the vicinity of the opposite side of the other door. Since it is comprised in this way, even if it has a double door and two doors, a closed state can be detected by only one noncontact sensor. According to still another aspect of the invention, the noncontact sensor is a magnetic proximity sensor in which the detection unit is a coil and the detection unit is a magnet. Since the magnetic proximity sensor is inexpensive and highly accurate, a reliable safety door can be provided inexpensively.

1 is a top view showing a mold clamping device of a vertical injection molding machine according to an embodiment of the present invention, a protective cover that encloses the mold clamping device, and a safety door. It is a front view showing the safety door provided in the vertical injection molding machine concerning this embodiment from inside. It is a front view which shows the safety door provided in the conventional vertical injection molding machine from an inner side.

  Hereinafter, the present embodiment will be described. The vertical injection molding machine 1 according to the present embodiment is also covered by the protective cover 3 and the safety doors 4 and 4, as shown in FIG. FIG. 1 shows the mold clamping device 2 of the vertical injection molding machine 1, and the protective cover 3 is spaced from the rear of the upper movable plate 7 constituting the mold clamping device 2 from the rear by a predetermined distance. It is provided. Connected to the protective cover 3, safety doors 4 are provided on the left and right. That is, the safety doors 4 and 4 are disposed on the left and right of the turn table 8 constituting the mold clamping device 2. The front of the turntable 8 is open so that the operator can work as needed. By the way, although the safety doors 4 and 4 provided on the left and right are symmetrical in the left and right and have the same structure, they are both double doors, that is, double doors. Although the front view which looked at one set of safety door 4 from inner side is shown by FIG. 2, the safety door 4 consists of the rectangular-shaped 1st door 10 and the 2nd door 11. As shown in FIG. The first door 10 is pivotably supported by the hinges 13 and 13 with respect to the protective cover 3, and the second door 11 is pivotably supported by the hinges 14 and 14 with respect to the support 16. . Accordingly, the first and second doors 10 and 11 open and close as shown by the two-dot chain arc in FIG. In the present embodiment, these safety doors 4, 4 are locked in a closed state by a lock mechanism not shown in the figure, and opening and closing is performed during operation of the vertical injection molding machine 1. Can not. That is, these safety doors 4, 4 can be said to be so-called fixed doors.

  The safety doors 4 according to the present embodiment are provided with only one sensor for detecting a closed state. That is, the minimum number of sensors required for regulation is provided for the fixed door. The sensor comprises a non-contact sensor, in particular the sensor comprises a magnetic proximity sensor 18. The magnetic proximity sensor is a noncontact sensor, and includes a detected portion 19 made of a magnet, and a coil, that is, a detection portion 20 that detects whether the magnet is in proximity. Such a magnetic proximity sensor 18 is provided on the first and second doors 10 and 11 as follows. First, the detection unit 20 is provided in the first door 10, but among the long sides of the rectangle of the first door 10, the long sides corresponding to the opposite sides of the long sides provided with the hinges 13 and 13 are provided. It is provided. On the other hand, the to-be-detected part 19 is provided in the long side corresponding to the opposite side of the long side in which the hinges 14 and 14 are provided among the long sides of the rectangle of the 2nd door 11. FIG. The detection unit 20 and the detection unit 19 are provided so as to have the same height, and come close to each other when the safety door 4 is closed. The coils constituting the detection unit 20 are provided with a cable 22 and connected to a controller not shown. The cable 22 is provided with a margin by a predetermined length so as not to hinder the opening and closing of the first door 10 and is curved in the vicinity of the hinge 13. This curved portion is unrestrained relative to the first door 10 and will expand and contract when the first door 10 opens and closes. That is, play is secured.

  Since the safety door 4 according to the present embodiment is configured as described above, when the safety door 4 is opened and closed, it can be detected with high accuracy. First, when the safety door 4 is closed from the open state, the detection unit 20 and the detection target unit 19 approach each other. That is, a coil and a magnet approach. Then, a positive voltage is generated by the induced electromotive force. The controller detects this and determines that it is in the closed state. In the closed state, operation of the vertical injection molding machine 1 becomes possible. Meanwhile, the safety door 4 is opened from the closed state. At this time, the detection unit 20 and the detection unit 19 are separated. That is, the coil and the magnet are separated. Then, a negative voltage is generated by the induced electromotive force. The controller detects this and determines that the closed state has been opened. If the vertical injection molding machine 1 is in operation, the operation is immediately stopped or the control is switched. This ensures the safety of the workers.

  The safety door 4 according to the present embodiment can be variously modified. For example, although the safety door 4 has been described to be a double-sided door, the door may be configured as a single-sided door. Also in this case, the magnetic proximity sensor 18 is provided on the long side of the door on which the door is opened, that is, on the opposite side of the long side on which the hinge is provided. The magnetic proximity sensor 18 provided on the door may be either the detection target 19 or the detection unit 20, and either one may be used, and the other may be provided on a fixed part such as a support. Even in this case, when the door is opened and closed, the magnetic proximity sensor 18 can detect changes from the closed state and the closed state. Other variations are possible, and other non-contact sensors may be provided instead of the magnetic proximity sensor 18. For example, it can also consist of an optical sensor. The optical sensor is composed of a detection part consisting of a light emitting part and a detection part consisting of a light receiving part, but the open / close state of the safety door 4 can be detected with high accuracy also by such a non-contact type sensor.

Reference Signs List 1 vertical injection molding machine 2 clamping device 3 protective cover 4 safety door 7 upper movable plate 8 turn table 10 first door 11 second door 13 hinge 14 hinge 16 support 18 magnetic type proximity sensor 19 detection unit 20 detection Section 22 cable

Claims (3)

A safety door of a vertical injection molding machine, comprising a rectangular door, rotatably supported by a hinge at a predetermined long side, the opposite side being opened and closed in an arc,
The safety door includes a non-contact sensor including a detection unit and a detection unit, one of the detection unit and the detection unit is provided in the vicinity of the opposite side of the door, and the other is provided on a predetermined member. The safety door of a vertical injection molding machine according to claim 1, wherein when the door is closed, the detection portion is detected by the detection unit to detect the closed state of the safety door. The safety door according to claim 1, wherein the safety door is a double door comprising the door and another door, and the other door is pivotally supported at a predetermined long side by a hinge. The opposite side draws an arc and is opened and closed,
The safety door of a vertical injection molding machine according to a vertical injection molding machine, wherein the other one of the detection portion and the detection portion is provided in the vicinity of the opposite side of the other door.   The safety door according to claim 1 or 2, wherein the noncontact sensor is a magnetic proximity sensor in which the detection unit is a coil and the detection unit is a magnet. Molding machine safety door.

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