JPH0574770B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an electric load meter that detects mold clamping pressure in a mold clamping device such as a die-casting machine.
More specifically, the present invention relates to a simple attachment/detachment device for an electric load meter used for a pull-out tie bar.

[Prior Art] An overview of a toggle type mold clamping device in a tie casting machine or the like will be explained based on FIG. 2. Reference numeral 1 denotes a fixed die plate to which a fixed mold 2 is attached, and usually four tie bars 6,
6, and both ends of each tie bar 6, 6 are screwed together and fixed with tie bar nuts 7, 7. The movable die plate 4 attached with the movable mold 3 slidably fitted into the four tie bars 6, 6 presses the fixed mold 2 via the doggle mechanism 5 operated by the mold clamping cinder 9. is configured to do so. With the mold clamping device configured in this manner, mold clamping pressure of several hundred to several thousand tons can be applied to the molds 2 and 3 in large die casting machines. In such toggle type die-casting machines, care must be taken to ensure that the machine's mold clamping force is uniform. Therefore, in order to ensure that equal force is applied to each tie bar, and to determine whether a predetermined mold clamping force is being applied, a load meter is installed to detect whether or not a predetermined mold clamping force is being applied.

That is, a force corresponding to the pressing force of the mold clamping cylinder 9 acts on the tie bars 6, 6, and the tie bars 6, 6 are expanded by the stress. This amount of expansion is detected by a load meter (see, for example, Japanese Utility Model Publication No. 8629/1983). In the above example, the displacement detectors 10, 10 are mounted in holes along the tie bar axis that are formed in the ends of the tie bars 6, 6 on the link housing 8 side to detect the mold clamping force. However, since the displacement detectors 10, 10 are attached to the straight tie bars 6, 6, when replacing the fixed mold 2 and the movable mold 3 of a die-casting machine, etc., one of the tie bars 6, 6 is used. It is convenient to pull out both molds 2 and 3 from the fixed die plate to the extent that they can be replaced. When pulling out or inserting the tie bars 6, 6, the electrical connector of the electric load meter for the tie bars must also be connected and disconnected. Therefore, after inserting the tie bars 6, 6, it was necessary to make cumbersome adjustments each time.

[Objective] The object of the present invention is to provide a simple electrical load meter attachment/detachment device for a pull-out diver used in a die-casting machine, etc., so that the diver can be pulled out or inserted without touching the electrical system of the load meter at all. To provide an electric load meter for pull-out tie bars.

[Example] An example of an electric load meter for a pull-out tie bar according to the present invention will be described based on FIG.

The pull-out tie bar 11 is a fixed die plate 30
The threaded portion provided on the outer periphery of the end thereof is fixed with a nut 31. The end of the tie bar 11 has a conical bottom,
A stepped hole 12 is bored along its axis and has a stepped surface 12a in the middle. This stepped hole 12
A sleeve 19 is mounted on the stepped surface 12a, and a large diameter shaft portion 17a with a pointed tip and a small diameter shaft portion 17 are located in the center.
An indicator rod 17 consisting of b is loosely inserted. Around the opening of the stepped hole 12 on the end face of the tie bar 11, there is an adapter 13 having a stepped recess 13a with a hole approximately the same diameter as the stepped hole 12 in the center.
It is fixed to the end surface of the tie bar 11 by bolts 14, 14 screwed into the recessed surface. Then, the hole of this adapter 13 and the stepped hole 12
A tie bar side holder 15 is arranged opposite to. This holder 15 has an outward flange portion 15b on the outer periphery, and a hole with approximately the same diameter as the small diameter hole of the stepped hole 12 provided in the tie bar 11 is provided in the middle on the side opposite to the stepped hole 12. An inward flange portion 15d is provided at the center, and a hole 15e having the same diameter as the sensor case 22 is provided on the right side of the inward flange portion 15d, and the entire structure is formed on a cylinder. The left cylindrical portion 15a of this holder 15 fits into the recess of the adapter 13,
The holder 15 is attached to the adapter 13 by bolts 16, 16 inserted through the outward flange portion 15 of the holder 15. This bolt 1
Coil springs 18, 18 are respectively wound around the shaft portion of the bolt between the heads of the bolts 6, 16 and the outward flange portion 15b, and urge the holder 15 to the left in the figure. Therefore, the sleeve 19 in contact with the inner end 15c of the holder 15 has a stepped surface 1 in the stepped hole 12 of the tie bar 11.
2a to form a reference surface.

On the other hand, the inward flange portion 15d of the holder 15, the large diameter shaft portion 17a and the small diameter shaft portion 17 of the indicator rod 17,
A coil spring 20 is also wound around the small diameter shaft portion between the stepped surface 17c between the pointer rod 17 and the stepped surface 17c.
It is pressed against the bottom of the stepped hole 12 at the bottom of No. 1.

The hole 15e on the right side of the holder 15 forms a sensor coupling part, and the tip of a sensor case 22 housing a sensor 21 that electrically detects the amount of displacement is tightly and removably fitted into the hole 15e. I'm starting to do that. The base end of this sensor case 22 has a flange portion 22 that projects outward.
a, and this flange portion 22a has a sensor 21
is slidably fitted into a hole 25a of a fixed holder 25 attached to a bracket 24 of a die-casting machine or the like. A coil spring 26 is inserted between the sensor 21 and the mounting bottom plate 25b of the fixed holder 25, and the coil spring 26 protrudes from the sensor 21, the sensor case 22, and the sensor 21, and operates through the hole in the inward flange portion 15d of the holder 15. The rod 23 is pressed against the left side in the figure, so that the operating rod 23 is always in contact with the end surface of the small diameter shaft portion 17b of the indicator rod 17 with a constant pressure. The fixed holder 25 has an outwardly protruding flange portion of the bottom plate 25b attached to the bolt 2.
7 and 27, it is attached to the bracket 24 attached to the fixed die plate 30. The lead wire 28 of the sensor 21 is led to a control circuit (not shown) through a through hole in the bottom plate 25b of the fixed holder 25 and a through hole in the bracket 24.

Next, the function of detecting the amount of extension of the tie bar 11 by the electric load meter will be explained.

The tie bars 11 are extended by the operation of a mold clamping cylinder (not shown). At this time, the stepped hole 12 provided at the end of the tie bar 11 also extends by Δl,
Indicator rod 17 loosely inserted into this stepped hole 12
Since it is pressed by the spring 20, it moves to the back of the tie bar 11 while contacting the bottom of the stepped hole 12 on the left side of the figure. Since the reference position of the sensor 21 is regulated via the holder 15, the amount of elongation detected by the sensor 21 due to the actuating rod 23 in contact with the indicator rod 17 is based on the stepped surface 12a of the stepped hole 12 of the tie bar 11.
Only the amount of elongation of the distance l from the bottom of the stepped hole 12 is measured. At this time, the sensor 21 is always connected to the spring 26 inside the fixed holder 25.
It contacts the holder 15 with a constant pressure. Further, the holder 15 is pressed against the sleeve 19 by the action of springs 18, 18, and the reference position is regulated.

In the electrical load meter for a pull-out tie bar of a die-casting machine, etc. configured in this way, even if the tie bar 11 is pulled out from the fixed die plate 30 of a die-casting machine, etc., if necessary, it is not separated between the sensor case 22 and the holder 15. Since the sensor 21 remains on the bracket 24 side and does not come out together with the pulled out tie bar, the electrical system of the sensor 21 remains as it is, and there is no need to connect or disconnect any electrical connectors, making the work extremely easy. improves. In addition, even though the tie bar side holder and fixed holder are composed of extremely simple structural members, the cylinder part of their fitting part can be made with high precision, so even if the tie bar is pulled out or inserted or removed, Accurate detection is possible with a simple configuration.

In addition, although the said Example demonstrated the case where the adapter 13 and the sensor case 22 were used, these are not necessarily necessary. In addition, although we have explained the electric type as a displacement detector sensor, it is also possible to use a magnetic type or an optical type, or a type that converts the detected value into an electric signal and extracts it. The same action and effect can be obtained.

[Effects of the Invention] As explained above, an electric load meter for a mold clamping device such as a die-casting machine has a simple structure in which the sensor is attached to a bracket other than a tie bar, and the sensor can be connected without connecting or disconnecting the sensor connector. The tie bar can be removed or inserted with the electrical system still installed, further improving the workability of die-casting machines, etc.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of main parts showing one embodiment of an electric load meter for a pull-out tie bar according to the present invention, and FIG.
The figure is a schematic diagram of a mold clamping device in a die-casting machine. 11...Tie bar, 12...Stepped hole, 1
5...Holder, 17...Indicator stick, 19...
...Sleeve, 21...Sensor, 24...Bracket.

Claims (1)

[Claims] 1. In an electric load meter for a mold clamping device of a die-casting machine or the like having a removable tie bar, a fixed holder fixed to a bracket or the like is provided with a habit of protruding from the holder so as to be freely displaceable. It is attached to the end face of the tie bar facing the installed electric load meter sensor and the stepped hole drilled along the axis of the tie bar, and is loosely inserted up to the large diameter step of the stepped hole. The sleeve and the indicator rod, which is loosely inserted to the bottom of the stepped hole, are each elastically pressed, and the sensor is removably fitted, and the fitted sensor is inserted into the hole. a tie bar side holder having a sensor coupling part that comes into contact with the indicator rod, and the sensor remains on the bracket side when the pull-out tie bar is pulled out from a die-casting machine or the like. Electric load meter for tie bar