JPH0711317U - Insert detection device in injection molding machine - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention relates to an insert detection device,
This is an improvement that makes it possible to detect the state of mold opening, the state of incorporating an insert, and the state after resin filling, and to confirm that resin is actually filled. [Structure] Tip portion 11 that contacts a molded article, and tip portion 11
Has a pedestal portion 12 that is connected to the front end of the pedestal 12 and comes into contact with the insert in the axial direction. The detection pin 1 is arranged so as to be movable in the axial direction, and the return spring 21 that presses the detection pin 1 against the molded product. And an insert article in an injection molding machine having a position detector 3 for detecting three positions in the axial direction, that is, a position of the detection pin 1 when the mold is opened, a position when the insert is assembled, and a position when the resin filling is completed. It is a detection device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an insert detection device in an injection molding machine, and in particular, it can separately detect three positions of a mold open state, an insert incorporated state, and a state after resin filling. The present invention relates to an insert detection device capable of confirming that the resin is surely filled.

[0002]

[Prior art]

 When molding a molded product having an insert, it is important to detect whether or not the insert is incorporated in the mold before molding, for the purpose of eliminating defective products that do not contain the insert. Therefore, the insert detection device in the injection molding machine according to the related art has the ability to detect the mold open state and the insert assembly state.

[0003]

[Problems to be solved by the device]

 By the way, the insert detection device in the injection molding machine according to the prior art does not have the ability to detect whether or not the resin filling is completed. For this reason, regarding the filling of the resin, it is only indirectly known by measuring the injection amount of the resin, etc., and it was not measured or detected whether or not the resin was reliably filled.

An object of the present invention is to eliminate this drawback, and it is possible to detect a state after the resin filling is completed as well as a state where the mold is opened and a state where the insert object is incorporated, and the resin is actually filled. It is an object of the present invention to provide an insert object detection device in an injection molding machine, which is capable of confirming that the

[0005]

[Means for Solving the Problems]

 This invention has a tip portion (11) that contacts the molded product and a pedestal portion (12) that is connected to this tip portion (11) and that contacts the insert in front of the axial direction, and moves in the axial direction. The detection pin (1) that is arranged as much as possible, the return spring (21) that presses the detection pin (1) against the molded product, and the position of the detection pin (1) when the mold is opened in the axial direction. The above problem is solved as an insert detection device in an injection molding machine having a position detector (3) for detecting three positions, a position when the insert is installed and a position when the resin is filled. It is a thing.

When the position detector (3) is composed of the position pressure converter (31) and the pressure detector (35), it is easy to use the insert detection device in the injection molding machine.

[0007]

[Action]

 In the insert detecting device in the injection molding machine according to the present invention, first, in the mold opening state, the detection pin 1 is pushed out in the axial direction by the return spring 21 and is in the position when the mold is opened (see FIG. 1). . Next, in a state where the insert is incorporated into the mold and before ejection, the insert presses the pedestal portion 12 of the detection pin 1, and the detection pin 1 resists the force of the return spring 21 and opens when the mold is opened. It is pushed back from the position and is in the position when the insert was installed (see Fig. 2). Finally, when injection is started, the filled resin presses the tip small diameter portion 11 of the detection pin 1, and the detection pin 1 returns against the force of the spring 21 and moves further downward from the position when the insert is assembled. It is pushed back to the position where the resin filling is completed (see Fig. 4). Then, the cooperation of the position detector 3 makes it possible to detect these three positions, and it is detected that the detection pin 1 has retracted to the position at the end of resin filling, and the resin has actually been filled. You can confirm that.

[0008]

【Example】

 The insert detecting device in the injection molding machine according to the present invention will be described in more detail below with reference to the drawings.

FIG. 1 is a vertical cross-sectional view showing a schematic configuration of an insert detection device in an injection molding machine according to the present invention, showing a state of mold opening before injection molding. In FIG. 1, 4 is the tip of the heating cylinder of the vertical injection molding machine. Reference numeral 5 denotes a mold, which is composed of an upper mold 51, a spool bush 52, a locate ring 53, and a lower mold 54 and is in a mold open state. Therefore, the upper mold 51 and the lower mold 54 are vertically separated from each other. . The upper die 51 is provided with a first opening 55. The first opening 55 is a passage through which the resin is supplied from the tip 4 of the heating cylinder of the vertical injection molding machine. The lower mold 54 is provided with a second opening 56.

Reference numeral 2 is a frame, and the lower mold 54 is attached to the frame 2. The frame 2 is provided with a third opening 23 that is electrically connected to the second opening 56 of the lower mold 54, and the detection cylinder 22 is installed in communication with the third opening 23. The detection pin 1 is arranged so as to pass through the second opening 56 of the lower mold 54, the third opening 23 of the frame 2 and the detection cylinder 22. A pedestal part 12 is provided at the tip of the detection pin 1 on the die side, and the tip part 11 of the detection pin 1 is formed in a stepwise shape thinner than the body part 15. Reference numeral 13 is a throttle valve at the other end of the detection pin 1. A detection piston 14 is integrated with the detection pin 1 and also functions as a stopper when moving in the detection cylinder 22 in the axial direction. Reference numeral 21 denotes a return spring, which is located in the detection cylinder 22 and presses the detection piston 14 and the detection pin 1 in the direction of the upper die 51 indicated by the arrow A, so that the detection piston 14 is placed on the upper surface of the detection cylinder 22. It has stopped at the end. This position of the detection pin 1 is the position when the mold is opened.

A position detector 3 is composed of a position pressure converter 31 and a pressure detector 35. The position pressure converter 31 comprises an air inlet 32, a first throttle opening 33 and a second throttle opening 34. Air having a constant pressure is supplied to the air inlet 32 from an air source (not shown). The second diaphragm opening 34 is open to the atmosphere. When the throttle valve 13 of the detection pin 1 is located in the first throttle opening 33 and the detection pin 1 moves in the axial direction, the air resistance when air flows through the first throttle opening 33 changes. Since the air resistance of the second throttle opening 34 is constant, the pressure in the passage between the first throttle opening 33 and the second throttle opening 34 changes as the detection pin 1 moves in the axial direction. . The pressure detector 35 is configured to detect this changing pressure.

FIG. 2 is a vertical cross-sectional view showing a schematic configuration of an insert detection device in an injection molding machine according to the present invention, showing a state when the insert is assembled. Reference numeral 61 is a connecting pipe material that is an insert, and 65 is a connecting rod material that is an insert.

FIG. 3A shows a perspective view of the connecting pipe member 61 and the connecting rod member 65. In FIG. 3A, the connecting pipe member 61 has a fourth opening 62 and a fifth opening 63. The connecting rod 65 has a ring-shaped recess 66. The connecting pipe member 61 and the connecting rod member 65 are combined as shown by an arrow B when the insert object is assembled, and a longitudinal section of a molded product having the insert member (connecting pipe member and connecting rod member) of FIG. 3B. As shown in the figure, the fourth opening 62, the fifth opening 63, and the ring-shaped recess 66 are arranged at the same position on the axis. 7 is a resin molding portion injected by a molding machine.

Returning to FIG. 2, the fourth opening 62 of the connecting pipe member 61 is located at a position corresponding to the first opening 55 of the upper mold 51. The fifth opening 63 of the connecting pipe member 61 is located at a position corresponding to the second opening 56 of the lower mold 54, and is positioned so as to match the tip portion 11 of the detection pin 1. Then, the pedestal portion 12 of the detection pin 1 hits the connecting pipe member 61, and the return spring 21 is in a compressed state. This position of the detection pin 1 is the position when the insert is assembled. In this state, the throttle valve 13 of the detection pin 1 approaches the first throttle opening 33, so that the air resistance of the first throttle opening 33 increases more than when the mold is opened.

FIG. 4 is a vertical cross-sectional view showing a schematic configuration of an insert object detecting device in an injection molding machine according to the present invention, showing a state at the time of completion of resin filling. In FIG. 4, 7 is a resin molded portion. Due to the pressure applied when molding the resin molded portion 7, the return spring 21 is in a more compressed state than when the insert material was assembled. This position of the detection pin 1 is the state when the resin filling is completed. In this state, the first throttle opening 33 is almost covered by the throttle valve 13 of the detection pin 1, and the air resistance becomes the lowest value.

FIG. 5 is a characteristic diagram of the position pressure transducer 31, in which the horizontal axis represents the position of the detection pin 1 and the vertical axis represents the passage between the first throttle opening 33 and the second throttle opening 34. The pressure is the pressure that is input to the pressure detector 35. In FIG. 5, the crosses indicate pressures P1, P2, and P3 corresponding to the position when the mold is opened, the position when the insert is assembled, and the position when the resin filling is completed. Since the pressure detector 35 emits a signal according to this pressure, unlike the prior art, not only the position at the time of mold opening and the position at the time of inserting the insert, but also the position at the end of resin filling becomes clear. You can see that the resin injection is actually completed.

It should be noted that this invention does not have to be a molded product as shown in FIG. Paying attention to the boundary area of the insert, the mold 5 and the detection pin 1 may be designed so that the insert hits the pedestal portion 12 and the filling resin hits the tip 11.

[0018]

[Effect of device]

 As described above, according to the present invention, the detection pin 1 is provided with the pedestal portion in the portion facing the molded product and the tip portion is formed thin, so that the detection pin 1 is a free position. Since it is automatically positioned at the open position, the position when the insert is installed, which is regulated by the insert, and the position at the end of resin filling, which is regulated by the filling resin, the position detector These positions are detected. For this reason, not only the mold open state and the insert assembly state but also the resin filling completion state become clear, which indicates that the injection of the resin has actually been completed.

[Submission date] September 20, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

FIG. 5 is a characteristic diagram of the position pressure transducer 31, where the horizontal axis represents the position of the detection pin 1 and the vertical axis represents the communication between the first throttle opening 33 and the second throttle opening 34. It indicates the pressure in the passage and is the pressure input to the pressure detector 35. 5, the curve shows the position at the time of mold opening, as the positions for the inserts was built, the pressure P 3 corresponding to the position at the time of resin filling completion and P2 and P 1. Since the pressure detector 35 emits a signal according to this pressure, unlike the prior art, not only the position at the time of mold opening and the position at the time of inserting the insert, but also the position at the end of resin filling becomes clear. It can be seen that the injection of resin has actually been completed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an insert detection device in an injection molding machine according to the present invention, showing a state when a mold is opened.

FIG. 2 is a vertical cross-sectional view of an insert detection device in an injection molding machine according to the present invention, showing a state when the insert is incorporated.

FIG. 3A is a perspective view of a connecting pipe member and a connecting rod member, and FIG. 3B is a vertical cross-sectional view of a molded product having an insert.

FIG. 4 is a vertical cross-sectional view of an insert detection device in an injection molding machine according to the present invention, showing a state after completion of resin filling.

FIG. 5 is a characteristic diagram of a position pressure converter.

[Explanation of reference numerals] 1 detection pin 2 frame 3 position detector 4 tip of heating cylinder of vertical injection molding machine 5 mold 51 upper mold 52 spool bush 53 locate ring 54 lower mold 55 first opening 56 second opening 23 3rd opening 22 Detection cylinder 11 Tip part 12 Pedestal part 15 Body part 13 Throttle valve 14 Detection piston 21 Return spring 31 Position pressure converter 32 Air inlet 33 First throttling opening 34 Second throttling opening 35 Pressure detection Vessel 61 connecting pipe material 62 fourth opening 63 fifth opening 65 connecting rod material 66 ring-shaped recess 7 resin molded portion

Claims (2)

[Scope of utility model registration request] 1. A pedestal portion (12), which is in contact with a molded product and which is in contact with the insert, and which is connected to the distal end portion (11) and comes in contact with the insert in front of the axial direction. A detection pin (1) movably arranged, and a return spring (2) for pressing the detection pin (1) against a molded product.
1) and a position detector (3) for detecting three positions in the axial direction, that is, a position when the detection pin (1) is opened, a position when the insert is assembled, and a position when the resin filling is completed. An insert object detection device in an injection molding machine, comprising: 2. The insert detecting device in an injection molding machine according to claim 1, wherein the position detector (3) comprises a position pressure converter (31) and a pressure detector (35). .