JPH0628252Y2 - Position detection device for rod of cylinder device of injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention detects the position of a specific portion of a rod, for example, for adjusting the protruding amount of a rod of a cylinder device for ejecting an eject pin of an injection molding machine. The present invention relates to a rod position detection device for a cylinder device of an injection molding machine.

(Prior Art) An example of a rod position detecting device of a conventional cylinder device of an injection molding machine will be described with reference to FIG. The injection molding machine 100 shown in FIG. 4 is a vertical type, molding is performed at the position X in the mold clamping mechanism 102, the opened mold is moved to the position Y by the turntable 104, and the molded product is eject pin 106. Is projected from the mold by.

The ejection (vertical movement) of the eject pin 106 is performed via the ejection cylinder device 108 provided in the injection molding machine 100. The protruding amount of the eject pin 106 is detected by the vertical movement amount of the rod 110 of the cylinder device 108. Therefore, the stroke is determined by detecting the vertical position of a specific portion (eg, sensing piece) of the rod 110 by detecting the sensors 112 and 114 (eg, limit switch).

The protruding amount of the eject pin 106 differs depending on the mold, and when the mold is replaced, the amount of adjustment is adjusted by the operator inserting his / her hand into the injection molding machine 100 to change the position of the sensor 112. .

(Problems to be Solved by the Invention) However, the conventional injection molding machine has the following problems.

Depending on the structure of the injection molding machine and the arrangement of peripheral devices, it may be troublesome, difficult or impossible for the operator to adjust the position of the sensor by inserting his / her hand from the outside. Furthermore, there is also a problem that since the operator puts his / her hand into the machine to work, there is always danger.

Therefore, an object of the present invention is to provide a rod position detecting device for a cylinder device of an injection molding machine, which enables an operator to safely change the position of a sensor or the like from outside the injection molding machine.

[Means for Solving the Problems]

 In order to solve the above problems, the present invention has the following configuration.

That is, a sensor unit including a sensor for detecting a position of a specific portion of a rod of a cylinder device of an injection molding machine, and the sensor unit are screwed together, approach the cylinder device, and are parallel to the expansion and contraction direction of the rod. Or a remote control handle for rotating the screw rod, which is rotatable about the axis and is not movable in the length direction, and which rotates the screw rod through a connecting mechanism, or injection molding A sensor for detecting the position of the specific portion provided on the specific portion of the rod of the cylinder device of the machine, and an operating means for activating the sensor when the sensor approaches, are screwed together, and approach the cylinder device. And a rod that is arranged parallel to the extension and contraction direction of the rod, is rotatable about an axis, and is immovable in the length direction, and a remote rod that rotates the rod through a connecting mechanism. It is equipped with an operation handle It is characterized in.

(Operation) The operation will be described.

When the operator operates the remote control handle, the screw rod is rotated via the connecting mechanism. Then, the sensor portion or the actuating means screwed into the screw rod moves along the extension / contraction direction of the rod.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 shows the appearance of the injection molding machine 10 of this embodiment.

Reference numeral 12 denotes a molding portion, and inside thereof, the mold clamping mechanism 102, the turntable 104, and the eject pin 10 shown in FIG.
6, and a hydraulic cylinder device 16 with a position detection device 14 for moving the eject pin 106 up and down are provided.

Reference numeral 18 denotes a remote control handle (hereinafter also simply referred to as “handle”), which is provided for adjusting the position of a sensor (described later) of the position detection device 14, which will be described in detail later.

An injection device 20 injects the molten resin into a mold (not shown) set in the mold clamping mechanism 102.

Next, the position detection device 14 provided in the injection molding machine 10 will be described with reference to FIGS. 1 and 2.

Reference numeral 22 denotes a sensor unit, which is integrally provided with the hydraulic cylinder device 16 via a connecting plate 24, and two guides 2 provided in parallel with the rod 26 of the hydraulic cylinder device 16.
Along rods 8 and 30, rods 26, for example at position 22a
It can move in the direction of expansion and contraction, that is, in the vertical direction.

Reference numeral 32 denotes a screw rod, which is installed between the connecting plate 24 and the mounting plate 34 to which the lower ends of the guides 28 and 30 are fixed. The screw rod 32 is arranged in parallel with the guides 28, 30 and the rod 26, and is rotatable about the axis with respect to the connecting plate 24 and the mounting plate 34 via ball bearings 36. Is immovable. Further, the screw rod 32 is screwed into the center of the sensor portion 22, and the rotation of the screw rod 32 allows the sensor portion 22 to move up and down along the guides 28 and 30.

Reference numeral 38 denotes a sensor (for example, a proximity switch or a limit switch) for detecting the forward limit of the eject pin 106, which is fixed to the sensor unit 22 and integrally with the sensor unit 22 and the rod 26.
It can be moved in the direction of expansion and contraction. When it is detected that the sensor 38 is fixed to the rod 32, the sensing piece 40, which is an example of a specific moving body or a specific portion of the rod 32 or an example of an operating means, is located at the position 40a, the hydraulic cylinder device 1
The operation of 6 is stopped, and the upward movement of the rod 26 is stopped. A vertical movement mechanism (not shown) connected to the rod 26 is provided on the upper side of the cylinder body 42 of the hydraulic cylinder device 16, and is connected to a projecting mechanism (not shown) of the eject pin 106. Therefore, when the sensor 38 detects the sensing piece 40, the maximum protruding position of the eject pin 106 is determined.

Reference numeral 44 denotes a sensor (eg, limit switch) for detecting the backward limit of the eject pin 106, which is fixed to the right end portion of the mounting plate 34. When the sensor 44 detects the sensing piece 40, the operation of the hydraulic cylinder device 16 is stopped and the rod 2
The downward movement of 6 stops. Therefore, the sensor 44 detects the sensing frame 40.
The maximum retracted position of the eject pin 106 is determined by detecting the.

The handle 18, which shows the structure of the handle portion in FIG. 2, is rotatably provided on the side wall 46 of the injection molding machine 10. The handle 18 is manually rotated by an operator, but may be rotated by a DC motor. The handle 18 is rotatable through a ball bearing 52 ... In a through hole 50 formed in a side wall 46 and a protrusion 48 fixed to the side wall 46. The protrusion 48 of the handle 18
When fixing the position with respect to, the handle 18 cannot be rotated by tightening the bolt 54, and the rotational position of the handle 18 with respect to the protrusion 48 can be fixed.

Reference numeral 56 is a flexible connecting wire which is an example of a connecting mechanism. The structure of the connecting wire 56 is shown in FIG.

In FIG. 5, reference numeral 58 denotes an inner shaft portion, which is formed by laminating and winding a plurality of wire layers 62 ... On a single core wire 60. Each wire layer 62 ... Is wound in the opposite direction. Reference numeral 64 denotes an outer skin portion, which is formed by winding a hard steel wire, a mild steel wire or a flat copper wire 66 around the outer circumference of the inner shaft portion 58 and coating the outer surface with a resin to protect the inner shaft portion 58 from moisture and the like. The inner shaft portion 58 is rotatable in the outer skin portion 64. Rotating shafts 68 are attached to both ends of the inner shaft portion 58 and are rotatable together with the inner shaft portion 58. Rotating shaft 6
8 are attached to both ends of the inner shaft portion 58 and are protected by connectors 70.

Referring again to FIG. 1 and FIG. 2, the handle 1 is connected through the rotary shafts 68 at the both ends of the connecting wire 56.
The rotating shaft 72 of No. 8 and the upper end portion 74 of the screw rod 32 are connected to each other. Therefore, the rotation of the handle 18 directly causes the screw 32 to rotate.
Is transmitted as the rotation of. In this embodiment, since the flexible connecting wire 56 is used, the connecting mechanism can be arranged in the injection molding machine 10 quite freely. The connecting mechanism is not necessarily limited to the flexible connecting wire 56, and various connecting mechanisms can be used if structurally allowed.

The handle 18 of this embodiment is provided with a pointer scale 76 as shown in FIG. This pointer scale 7
Reference numeral 6 denotes the rotation of the rotary shaft 70 of the handle 18 converted into the rotation of the pointer through a gear mechanism 78 (see FIG. 2) provided inside, and a scale plate converted into the protrusion amount of the eject pin 106 is provided. Therefore, the maximum protruding amount of the eject pin 106 currently set can be read at a glance.

In order to change the maximum protruding amount of the eject pin 106 of the injection molding machine 10 configured as described above, the operator first looks at the pointer scale 76 of the handle 18 while looking at the handle 18
To rotate. Then, the rotation of the handle 18 is transmitted to the screw rod 32 through the connecting wire 56, and the screw rod 32 rotates. Then, the sensor unit 22 moves up and down to change the position of the sensor 38 to the designated position. Sensor 38
By changing the position of the
Since the maximum upward movement position of the eject pin 106 changes, the maximum protrusion amount of the eject pin 106 can also be changed. When the pointer scale 76 of the handle 18 reaches a desired value, the bolts 54 can be tightened to fix the position of the handle 18, and thus the position of the sensor unit 22.

In the above-described embodiment, the sensing piece 40 is provided on the rod 26 of the hydraulic cylinder device 16 and the sensor portion 22 is moved up and down by the screw rod 32. However, the sensor 38 is fixed to the rod 26 of the hydraulic cylinder device 16 to detect the sensing piece. Even if the sensing piece 40 is moved up and down by screwing 40 onto the threaded rod 32, the same effect as that of the above-described embodiment can be obtained.

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and instead of the rod of the hydraulic cylinder device for ejecting the eject pin, another movable device is used. It goes without saying that many modifications can be made without departing from the spirit of the invention, such as being able to be used for position detection of parts.

(Effect of the Invention) With the rod position detecting device of the cylinder device of the injection molding machine according to the present invention, when the operator operates the remote control handle, the screw rod is rotated through the connecting mechanism. Then, the sensor portion or the actuating means screwed to the screw rod can be moved in the expansion / contraction direction of the rod. Therefore, the operator can safely, easily and promptly change the position of the sensor section or the operating means without putting his / her hand in the injection molding machine. Further, even if the position of the remote control handle and the sensor section or the operating means in the injection molding machine are separated, remote operation can be performed by the connecting mechanism, so that the sensor section or the sensor located in a position where the operator cannot reach even if they put their hands in It is possible to change the position of the actuating means.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a rod position detecting device of a cylinder device of an injection molding machine according to the present invention, and FIG. 2 is a partially cutaway side view showing a structure of a handle portion for remote operation. FIG. 3 is a front view of the injection molding machine of the embodiment, FIG. 4 is a partial front view of a molding part of a conventional injection molding machine, FIG. 5 is a partial explanatory view of a connecting wire, and FIG. 6 is a front view of a handle. Fig. 10 ... Injection molding machine, 14 ... Position detection device, 16 ...
Hydraulic cylinder device, 18 ... Handle, 22 ... Sensor section, 26 ... Rod, 32 ... Screw rod, 38 ... Sensor,
40 ... Sensing piece, 56 ... Connecting wire, 106 ... Eject pin.

Claims (3)

[Scope of utility model registration request] 1. A sensor section including a sensor for detecting a position of a specific portion of a rod of a cylinder device of an injection molding machine, and a screw part of the sensor part, which is close to the cylinder device and which extends and contracts. And a remote control handle that rotates about the axis and is immovable in the length direction and a remote control handle that rotates the screw via a connecting mechanism. A rod position detection device for a cylinder device of a characteristic injection molding machine. 2. A sensor for detecting a position of a specific portion provided on a specific portion of a rod of a cylinder device of an injection molding machine, and an operation means for activating the sensor when the sensor approaches the screw. A threaded rod that is arranged close to the cylinder device and parallel to the expansion and contraction direction of the rod, is rotatable about an axis, and is immovable in the length direction, and a mechanism that connects the threaded rod. A rod position detecting device for a cylinder device of an injection molding machine, comprising: 3. The rod position detecting device for a cylinder device of an injection molding machine according to claim 1, wherein the rod is a rod for a cylinder device for ejecting an eject pin.