Mold positioning device for molding machine

Abstract

To provide a die positioning device capable of easily arranging a centering device and a deceleration sensor at low cost regardless of a die conveying device.SOLUTION: A die positioning device for a molding machine, in which a die transfer device 5 for transferring a die M between the molding machine 1 and a die changer 2 provided beside the molding machine 1 is provided in the lower part of the molding machine 1, comprises a first positioning member 15 provided in the upper part of the die M, a first centering device 18 provided in the upper part of the molding machine 1 and bringing the die M into contact with the first positioning member 15 to center the die M, a first deceleration sensor 21 provided in the upper part of the molding machine 1 and detecting the first positioning member 15 of the die M being transferred, and a control device 11 for decelerating a drive motor 8 of the die transfer device 5 according to the detection of the first deceleration sensor 21.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a positioning device for a mold for a molding machine. [Background technology]

[0002] Known positioning devices for molds for molding machines include those described in, for example, Japanese Utility Model Publication No. 3-25949 (Patent Document 1), Japanese Patent Application Laid-Open No. 9-66543 (Patent Document 2), or Japanese Patent Application Laid-Open No. 2019-51601 (Patent Document 3).

[0003] The device shown in "Figure 7" of Patent Document 1 has a "positioning device 56" provided above the platen (fixed platen) of the injection molding machine 52, which fits into a "recess" provided in the center of the top surface of the mold 44 to position the mold.

[0004] In the device shown in "Figure 3" of Patent Document 2, a fixed platen 3 of an injection molding machine 1 is provided with a roller member 11 that can transport a mold 2A in the loading / unloading direction, a centering device for positioning the mold 2A, and a clamping device 13 for clamping the mold 2A, and the tip of the piston rod of an air cylinder 12 of the centering device engages with a "recess" in the center of the lower end of the mold 2A, thereby centering and positioning the mold 2A.

[0005] The device shown in "Figure 2" of Patent Document 3 has a centering mechanism 3c provided between the first and second transport units 21a, 21b to center the mold M that has been brought in. This centering mechanism 3c raises an engaging member that is driven up and down by a fluid pressure cylinder, and centers the mold M1 by engaging the engaging portion at its upper end with a "recess" at the center of the lower end of the mold substrate M1a of the mold M1. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Publication number 3-25949 [Patent Document 2] Japanese Patent Application Publication No. 9-66543 [Patent Document 3] Japanese Patent Application Publication No. 2019-51601 Summary of the Invention [Problem to be solved by the invention]

[0007] In the devices described in Patent Documents 1 to 3, in order to position the mold, a positioning "recess" is formed in the center of the upper or lower end surface of the mold, and a "pin (tip of the piston rod)" of a centering device is fitted into this "recess."

[0008] In this case, in Patent Document 1, a "stopper 54" was provided on the molding machine to stop the mold at the fitting position. In Patent Document 2, when mold exchange devices 20 were arranged on both sides of one molding machine, the stoppers had to be provided on both the left and right sides of the molding machine, and when a mold was carried in from one of the mold exchange devices, the stoppers had to be arranged so as not to interfere with the mold carrying in.

[0009] In Patent Document 3, the drive motor 41 of the mold conveying mechanism is configured as a servo motor, and the mold is stopped at an accurate position.

[0010] The above-mentioned conventional methods require the formation of a "recess" for positioning in the mold, which increases the cost of mold production. The method described in Patent Document 1 requires the provision of a "stopper," the position of which changes depending on the size of the mold, resulting in high costs. The method described in Patent Document 2 requires the provision of a "stopper" that can be freely moved in and out, which increases the cost significantly when considering the need to change the position depending on the size of the mold. The method described in Patent Document 3 requires the use of a servo motor, which increases the cost even further.

[0011] Furthermore, if the centering device is installed below the molding machine, it is difficult to connect it to the mold transport device. In other words, because there is a chain or the like below the mold, it has been difficult to arrange the centering device and deceleration sensor in the past.

[0012] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a low-cost, reliable mold positioning device in which a centering device and a deceleration sensor can be easily arranged regardless of the mold transport device. [Means for solving the problem]

[0013] In order to achieve the above object, the present invention provides the following means: That is, in a mold positioning device for a molding machine in which a mold transport device for transporting a mold between a molding machine and a mold changer provided next to the molding machine is provided below the molding machine, the device comprises a first positioning member provided above the mold, a first centering device provided above the molding machine and abutting against the first positioning member to center the mold, a first deceleration sensor provided above the molding machine and detecting the first positioning member of the mold during transport, and a control device that decelerates a drive motor of the mold transport device in response to detection by the first deceleration sensor.

[0014] The first positioning member preferably comprises a rectangular block attached to the upper front surface of the central portion of the mold.

[0015] It is preferable that a second positioning member is provided at the bottom of the mold, and the mold changer is provided with a second centering device that abuts against the second positioning member to position the mold, and a second deceleration sensor that detects the second positioning member near the second centering device.

[0016] The mold changer is provided movably on one or both sides of the molding machine, and when it is provided on both sides, a pair of first centering devices are provided on the left and right.

[0017] The drive motor of the mold conveying device is preferably an induction motor.

[0018] Preferably, the first deceleration sensor is a proximity switch.

[0019] The first centering device preferably has a positioning pin provided on the first positioning member so as to be movable up and down so as to abut against the first positioning member in the direction of loading. [Effects of the Invention]

[0020] According to the present invention, a positioning member is provided on the top of the mold, so that a centering device and a deceleration sensor can be easily arranged regardless of the mold conveying device below, thereby providing a low-cost and reliable mold positioning device. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a front view showing an embodiment of the present invention, in which mold changers are arranged on both the left and right sides of the molding machine, (a) shows the mold changer arranged on the left side, (b) shows the molding machine, and (c) shows the mold changer arranged on the right side, with no molds attached. [Figure 2] FIG. 2 is a view of FIG. 1 with a mold attached. [Figure 3] FIG. 3 is an enlarged view of FIG. 1(b). [Figure 4] FIG. 4 is an enlarged view of FIG. 2(b). [Figure 5] FIG. 5 is a diagram showing a state in which the first positioning member is attached to the mold, where (a) is a front view and (b) is a side view. [Figure 6] FIG. 6 is an enlarged view of the main part of FIG. [Figure 7] FIG. 7 is an enlarged view of FIG. 2(a). DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In Fig. 1, mold changers 2 are arranged on both the left and right sides of the molding machine 1, with (a) showing the mold changer 2 arranged on the left side, (b) showing the horizontal injection molding machine 1 in the center, and (c) showing the mold changer 2 arranged on the right side, with no molds attached. Fig. 2 is a diagram of Fig. 1 with a mold M attached. Fig. 3 is an enlarged view of Fig. 1(b), and Fig. 4 is an enlarged view of Fig. 2(b).

[0023] As shown in FIG. 2, the mold M is provided on a mold mounting plate 3 , and the mold mounting plate 3 is attached to a fixed platen 4 of the molding machine 1 .

[0024] A mold transport device 5 for transporting a mold M between the molding machine 1 and a mold changer 2 provided beside the molding machine 1 is provided below the platen 4 of the molding machine 1.

[0025] The mold conveying device 5 has conveying rollers 6 that support the lower surface of the mold mounting plate 3 and move the mold M laterally, and a sprocket 7 is attached to the end of the conveying roller 6. The sprocket 7 is driven to rotate by a chain 10 that is wound around a reducer 9 of a drive motor 8. The drive motor 8 is composed of an induction motor. A control device 11 is provided to control the rotation of the drive motor 8.

[0026] A pair of clamp devices 12 are provided on the left and right below the fixed platen 4 of the molding machine 1 to secure the mold mounting plate 3 to the fixed platen 4. The clamp devices 12 have a cylinder 13 attached to the platen 4, and a clamp 14 is attached to the cylinder 13 so as to be able to freely protrude and retract upward. As shown in FIG. 4, the lower part of the mold mounting plate 3 is secured to the platen 4 by the clamp 14 protruding upward.

[0027] As shown in Fig. 5, a first positioning member 15 is provided on the top of the mold M. This first positioning member 15 is attached to the front upper end of the mold mounting plate 3. As shown in Fig. 4, the first positioning member 15 is attached to the center of the mold mounting plate 3 in the left-right direction.

[0028] The first positioning member 15 is made up of a rectangular block and is fixed to the mold mounting plate 3 by a central mounting bolt 16. Positioning knock pins 17 are provided on both the left and right sides of the mounting bolt 16, and the first positioning member 15 is positioned precisely in the center of the mold mounting plate 3 in the left-right direction.

[0029] Figure 6 is an enlarged view of the main part of Figure 4. A first centering device 18 is provided above the fixed platen 4 of the molding machine 1. This first centering device 18 has a positioning pin 19 that can move up and down. The positioning pin 19 that protrudes downward comes into contact with the first positioning member 15 to center the mold M.

[0030] A pair of first centering devices 18 are provided on the left and right sides, and each first centering device 18 has a cylinder 20 attached to the upper part of the fixed platen 4, and the positioning pin 19 protrudes downward from the cylinder 20 so as to be able to freely appear and disappear.

[0031] First deceleration sensors 21 are provided on both outer sides of the pair of left and right first centering devices 18. The first deceleration sensors 21 are configured as proximity switches attached to the platen 4. These proximity switches detect the approach of the first positioning member 15.

[0032] Clamping devices 12 are provided on both outer sides of the pair of left and right first sensors 21. The clamping devices 12 have cylinders 13 attached to the platen 4, and clamps 14 protrude downward from the cylinders 13 so as to be able to move in and out. The downwardly protruding clamps 14 secure the mold mounting plate 3 to the platen 4. (These clamping devices 12 are the same as those attached to the bottom of the platen 4, as shown in FIG. 4.)

[0033] Anti-tip hooks 22 are provided on the platens 4 on both sides of the clamp device 12 to prevent the mold from tipping over and falling in the unlikely event of such an accident.

[0034] FIG. 7 is an enlarged view of FIG. 2(a) and shows the mold changer 2 arranged on the left side, but the one arranged on the right side also has a symmetrical structure.

[0035] The mold changer 2 has a transport cart 23, which has four wheels 24 that roll on a pair of rails (not shown). The transport cart 23 is movable between a preparation position and an exchange position, and the state in Figures 1 and 2 shows the exchange position. The upper surface of the transport cart 23 is made into a transport roller 27, and the mold M is placed on this transport roller 27.

[0036] A mold transfer mechanism 26 is provided that laterally feeds the mold M placed on conveying rollers 27 to the molding machine 1. The mold transfer mechanism 26 has conveying rollers 27 that support the lower surface of the mold mounting plate 3 and move the mold laterally. A sprocket 28 is provided at the end of the conveying roller 27 as shown in FIG. 1(a), and the sprocket 28 is rotated by a chain 31 that is wound around a reducer 30 of a drive motor 29. The drive motor 29 is an induction motor. The rotation of the drive motor 29 is controlled by a control device 32.

[0037] In FIG. 1, the conveying roller 27 of the mold transfer mechanism 26 of the mold changer 2 and the conveying roller 6 of the mold conveying device 5 of the molding machine 1 need to be synchronized, so the control device 32 on the changer 2 side and the control device 11 on the platen 4 side perform the same control.

[0038] 2, 4, and 7, a second positioning member 33 is provided below the mold M. This second positioning member 33 is provided at the front center of the lower part of the mold mounting plate 3, and its mounting structure is the same as that of the first positioning member 15 shown in FIG.

[0039] The mold changer 2 is provided with a second centering device 34 that abuts against the second positioning member 33 to position the mold M. This second centering device 34 has a configuration similar to that of the first centering device 18. A second deceleration sensor 35 that detects the second positioning member 33 is provided near the second centering device 34. Like the first deceleration sensor 21, this second deceleration sensor 35 is composed of a proximity switch.

[0040] Next, the operation of the above embodiment will be described.

[0041] A case where a mold M is carried into the molding machine 1 from the mold changer 2 arranged on the left side shown in FIG. 2(a) will be described.

[0042] (1) The drive motor 29 of the mold conveying mechanism 26 of the mold changer 2 is driven by the control device 32, and the mold M is conveyed toward the molding machine 1. The drive motor 8 of the mold conveying device 5 on the molding machine 1 side is also synchronously driven by the control device 11.

[0043] (2) The mold M transferred from the mold changer 2 to the molding machine 1 moves to the right in FIG. 4, and when the first positioning member 15 is detected by the first deceleration sensor 21 on the left side, the control device 11 decelerates the drive motor 8.

[0044] (3) The positioning pin 19 of the first centering device 18 on the right side is caused to protrude downward by the control device 11.

[0045] In this case, the positioning pin 19 of the first centering device 18 on the left side does not protrude but remains in a retracted state, allowing the first positioning member 15 to pass through.

[0046] (4) The first positioning member 15 abuts against the positioning pin 19, and the mold M stops.

[0047] In this case, the mold M slips on the conveying roller 6 and stops, or the conveying roller 6 stops due to insufficient capacity of the drive motor 8. The capacity of the drive motor 8 is set to be such that it can convey the mold but not so high that it will damage the positioning pin 19.

[0048] (5) The movable platen (not shown) closes.

[0049] (6) The upper and lower clamping devices 12 fix the mold M.

[0050] Next, the operation of carrying out the mold M from the molding machine 1 to the mold changer 2 on the left side of FIG. 2(a) will be described.

[0051] The mold M is moved to the left in Fig. 4 by the mold conveying device 5 of the molding machine 1. As shown in Fig. 7, the mold M is transferred to the mold conveying mechanism 26 of the mold changer 2 and moved to the left, and when the second positioning member 33 is detected by the second deceleration sensor 35, the control device 32 decelerates the drive motor 29.

[0052] The positioning pin 19 of the second centering device 34 is caused to protrude upward by the control device 32 and abuts against the second positioning member 33, and the mold M is positioned and stopped in the mold changer 2.

[0053] The same applies to the case where the mold M is carried in and out of the molding machine 1 from the mold changer 2 arranged on the right side shown in FIG. 2(c).

[0054] Furthermore, the same applies when the mold M is loaded into the molding machine 1 from the mold changer 2 located on the left side of Figure 2(a) and then unloaded to the mold changer 2 located on the right side of Figure 2(c).

[0055] The mold changer 2 is provided so as to be freely movable on one or both sides of the molding machine 1. When provided on both sides, a pair of first centering devices 18 are provided, one on each side. However, when provided on only one side, only one of them is sufficient, and only one first deceleration sensor 21 is required.

[0056] The present invention is not limited to the above-described embodiment.

[0057] The scope of the present invention is defined by the claims, not by the above description, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0058] 1 Molding machine 2 Mold changer 3 Mold mounting plate 4 Fixed Platen 5. Mold transport device 6 Conveyor roller 7 sprockets 8 Drive motor 9 Reducer 10 Chain 11 Control device 12 Clamping device 13 cylinders 14 Clamp 15 First positioning member 16 Mounting bolts 17 Knock pin 18 First centering device 19 Locating pin 20 cylinders 21 First deceleration sensor 22 Anti-tip hook 23 Mobile cart 24 wheels 26 Mold transfer mechanism 27 Conveyor roller 28 sprockets 29 Drive motor 30 Reducer 31 Chain 32 Control device 33 Second positioning member 34 Second centering device 35 Second deceleration sensor

Claims

1. A mold positioning device for a molding machine, in which a mold conveying device for conveying molds between a molding machine and a mold changer provided beside the molding machine is provided below the molding machine, a first positioning member provided on an upper portion of the mold; a first centering device provided on an upper portion of the molding machine and contacting the first positioning member to center the mold; a first deceleration sensor provided on an upper portion of the molding machine and configured to detect the first positioning member of the mold during the transport; a control device that decelerates the drive motor of the mold conveying device in response to detection by the first deceleration sensor.

2. 2. The mold positioning device for a molding machine according to claim 1, wherein the first positioning member comprises a rectangular block attached to the upper front surface of the central portion of the mold.

3. A second positioning member is provided at the bottom of the mold, 3. A mold positioning device for a molding machine as described in claim 1 or 2, wherein the mold changer is provided with a second centering device that abuts against the second positioning member to position the mold, and a second deceleration sensor that detects the second positioning member near the second centering device.

4. A positioning device for a mold for a molding machine as described in any one of claims 1 to 3, wherein the mold changer is provided so as to be freely movable on one or both sides of the molding machine, and when provided on both sides, the first centering device is provided in pair on the left and right.

5. 5. The mold positioning device for a molding machine according to claim 1, wherein the drive motor of the mold transport device is an induction motor.

6. 6. The mold positioning device for a molding machine according to claim 1, wherein the first deceleration sensor is a proximity switch.

7. 2. The positioning device for a mold for a molding machine according to claim 1, wherein the first centering device has a positioning pin provided on the first positioning member so as to be able to move up and down and to abut against the first positioning member in a direction opposite to the direction of loading.

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