Material leakage detection device of injection molding machine

Abstract

The invention provides a material leakage detection device of an injection molding machine. A second normally open contact and a normally closed contact are connected in series and then are connected in a control loop of the injection molding machine; the first coil and the third coil are connected in parallel, then are connected in series with the limit switch and then are connected between the positive electrode and the negative electrode of the power supply, and the first normally open contact is connected in series with the liquid leakage detection and processing module and then has one end connected between the limit switch and the first coil and the other end connected with the negative electrode of the power supply. The liquid leakage detection and processing module is also connected with the power supply cathode through a second coil; when the injection molding equipment is in place, the limiting switch is synchronously closed, the first coil and the third coil are electrified to enable the first normally open contact and the second normally open contact to be closed, the injection molding machine starts to work, and when the liquid leakage detection and processing module detects that an injection port of the injection molding machine leaks materials, the second coil is electrified, the normally closed contact is disconnected, and the injection molding machine stops working. Whether the injection port of the injection molding machine leaks materials or not can be effectively monitored, and the injection molding machine is controlled to stop working.

Description

Technical Field

[0001] The present application relates to the field of injection molding technology, and in particular to a leakage detection device for an injection molding machine. Background Art

[0002] All injection molding machines on the market are equipped with leakage detection devices. However, the built-in leakage detection devices require multiple sets of data to be input before use in order to detect leakage. Moreover, for different molds, the operator needs to re-enter multiple sets of parameters before use to ensure the normal operation of the leakage detection function. The use is relatively complicated and cumbersome, and not convenient enough. Summary of the invention

[0003] The purpose of the present application is to provide a leakage detection device for an injection molding machine, which solves the problems that the existing leakage detection devices are complicated and cumbersome to use and inconvenient.

[0004] In order to achieve the above-mentioned object, the present application provides a leakage detection device for an injection molding machine, the injection molding machine comprising an injection molding device, including a limit switch, a leakage detection and processing module, a first relay, a second relay and a third relay, the first relay comprising a first coil and a first normally open contact, the second relay comprising a second coil and a normally closed contact, the third relay comprising a third coil and a second normally open contact, the second normally open contact being connected in series with the normally closed contact and then connected in a control circuit of the injection molding machine;

[0005] The first coil is connected in parallel with the third coil and then connected in series with the limit switch, and then connected between the positive electrode and the negative electrode of the power supply; the first normally open contact is connected in series with the leakage detection and processing module, and one end is connected between the limit switch and the first coil, and the other end is connected to the negative electrode of the power supply; the leakage detection and processing module is also connected to the negative electrode of the power supply through the second coil;

[0006] When the injection molding equipment is in place, the limit switch is closed synchronously, the first coil and the third coil are energized to close the first normally open contact and the second normally open contact, the injection molding machine starts to work, and the leakage detection and processing module starts to detect whether the injection port of the injection molding machine is leaking. When the leakage detection and processing module detects that the injection port of the injection molding machine is leaking, the second coil is energized, the normally closed contact is disconnected, and the injection molding machine stops working.

[0007] Optionally, the leakage detection and processing module includes a control unit, a temperature detection unit and a control switch, the temperature detection unit is used to detect the temperature of the shot port and send it to the control unit, the control unit determines whether the shot port of the injection molding machine is leaking according to the result of the temperature detection unit, when the control unit determines that the shot port of the injection molding machine is leaking, the control switch is closed and the second coil is energized.

[0008] Optionally, if the temperature fluctuation deviation of the injection port within a sampling time is greater than a first predetermined value, it is determined that the injection port of the injection molding machine is leaking material.

[0009] Optionally, if the temperature fluctuation deviation of the injection port within a sampling time is greater than a first predetermined value and the temperature rise duration exceeds a second predetermined value, it is determined that the injection port of the injection molding machine is leaking material.

[0010] Optionally, the second predetermined value is greater than or equal to 5s.

[0011] Optionally, the leakage detection and processing module further includes an alarm unit, and when the leakage detection and processing module detects leakage from the injection port of the injection molding machine, the alarm unit starts to alarm.

[0012] Optionally, the injection molding machine further comprises an alarm unit, and when the leakage detection and processing module detects leakage from the injection port of the injection molding machine, the alarm unit is triggered to start an alarm.

[0013] Optionally, after the leakage detection and processing module is powered on, it starts to detect whether there is leakage at the injection port of the injection molding machine after a first predetermined time.

[0014] Optionally, after the leakage detection and processing module loses power, if the leakage detection and processing module is powered on within a second predetermined time, the leakage detection and processing module continues to detect; if the leakage detection and processing module is powered on outside the second predetermined time, the leakage detection and processing module starts to detect whether the injection port of the injection molding machine is leaking after the first predetermined time.

[0015] In the leakage detection device of the injection molding machine provided in the present application, the injection molding machine includes an injection molding device, including a limit switch, a leakage detection and processing module, a first relay, a second relay and a third relay, the first relay includes a first coil and a first normally open contact, the second relay includes a second coil and a normally closed contact, the third relay includes a third coil and a second normally open contact, the second normally open contact is connected in series with the normally closed contact and then connected to the control circuit of the injection molding machine; the first coil is connected in parallel with the third coil and then in series with the limit switch and then connected between the positive pole and the negative pole of the power supply, the first normally open contact is connected to the leakage detection and processing module, and the second normally open contact is connected in series with the normally closed contact and then connected to the positive pole and the negative pole of the power supply. After the processing module is connected in series, one end is connected between the limit switch and the first coil, and the other end is connected to the negative electrode of the power supply. The leakage detection and processing module is also connected to the negative electrode of the power supply through the second coil; when the injection molding equipment is in place, the limit switch is closed synchronously, the first coil and the third coil are energized to close the first normally open contact and the second normally open contact, the injection molding machine starts to work, and the leakage detection and processing module starts to detect whether the injection port of the injection molding machine is leaking. When the leakage detection and processing module detects that the injection port of the injection molding machine is leaking, the second coil is energized, the normally closed contact is disconnected, and the injection molding machine stops working. The present application can effectively monitor whether the injection port of the injection molding machine is leaking. When the injection port of the injection molding machine is detected to be leaking, the injection molding machine can be conveniently and quickly controlled to stop working to ensure safe production. When the injection port of the injection molding machine is no longer leaking, the work can be simply and promptly resumed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a leakage detection device for an injection molding machine provided in an embodiment of the present application;

[0017] Figure 2 A schematic diagram of the structure of a first mold body and a second mold body of an injection molding machine provided in an embodiment of the present application;

[0018] Figure 3 A schematic diagram of temperature changes around a shot hole provided in an embodiment of the present application;

[0019] Wherein, the accompanying drawings are marked as follows:

[0020] 10-leakage detection and processing module; J1-first coil; J2-second coil; J3-third coil; K1-first normally open contact; K2-normally closed contact; K3-second normally open contact; K4-limit switch; K5-control switch; 101-first mold body; 102-second mold body; 103-injection molding cavity. DETAILED DESCRIPTION

[0021] The specific implementation of the present application will be described in more detail below in conjunction with the schematic diagram. Based on the following description, the advantages and features of the present application will become clearer. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present application.

[0022] Figure 1 A schematic diagram of a leakage detection device for an injection molding machine provided in this embodiment, Figure 2 The schematic diagram of the structure of the first mold body 101 and the second mold body 102 of the injection molding machine provided in this embodiment. Figure 1 and Figure 2 As shown, the injection molding machine includes a first mold body 101 and a second mold body 102. The first mold body 101 and the second mold body 102 are molded together to form an injection cavity 103. The injection port of the injection molding machine can be set on the first mold body 101 or the second mold body 102. The injection port is connected to the injection cavity 103, and the injection molding equipment can inject plasticized material into the injection cavity 103 through the injection port.

[0023] The leakage detection device of the injection molding machine includes a limit switch K4, a leakage detection and processing module 10, a first relay and a second relay, wherein the first relay includes a first coil J1 and a first normally open contact K1, and after the first coil J1 is energized, the first normally open contact K1 can be closed, the second relay includes a second coil J2 and a normally closed contact K2, and after the second coil J2 is energized, the normally closed contact K2 can be disconnected, and the third relay includes a third coil J3 and a second normally open contact K3, and after the third coil J3 is energized, the second normally open contact K3 is closed. The second normally open contact K3 is connected in series with the normally closed contact K2 and then connected to the control circuit of the injection molding machine, and only when the second normally open contact K3 and the normally closed contact K2 are both closed, the control board of the injection molding machine will start and perform injection molding.

[0024] Furthermore, the first coil J1 is connected in parallel with the third coil J3 and then in series with the limit switch K4, and then connected between the positive pole and the negative pole of the power supply. After the first normally open contact K1 is connected in series with the leakage detection and processing module 10, one end is connected between the limit switch K4 and the first coil J1 (and the third coil J3), and the other end is connected to the negative pole of the power supply. The leakage detection and processing module 10 is also connected to the negative pole of the power supply through the second coil J2.

[0025] The limit switch K4 is set at a certain position of the machine, and the limit switch K4 is closed synchronously when the injection molding equipment is in place. In this article, the injection molding equipment is in place specifically refers to the first mold body 101 and the second mold body 102 being completely molded. At the same time, the first coil J1 and the third coil J3 are energized, the first normally open contact K1 and the second normally open contact K3 are closed, and since the normally closed contact K2 is closed, the control board controls the injection molding machine to start working, and the leakage detection and processing module 10 starts to detect whether the injection port of the injection molding machine is leaking after the first predetermined time. When the leakage detection and processing module 10 detects that the injection port of the injection molding machine is leaking, the leakage detection and processing module 10 opens its own control switch K5, the second coil J2 is energized, the normally closed contact K2 is disconnected, and the control board controls the injection molding machine to stop working. It can be seen that the present application can effectively monitor whether the injection molding machine's shot port is leaking. When leakage is detected at the injection molding machine's shot port, the injection molding machine can be conveniently and quickly controlled to stop working to ensure safe production. When the injection molding machine's shot port is no longer leaking, work can be resumed simply and promptly.

[0026] Optionally, the leakage detection and processing module 10 includes a control unit, a temperature detection unit and a control switch K5. The temperature detection unit is used to detect the temperature of the injection port and send it to the control unit. The temperature detection unit can be installed on the first mold body 101 or on the second mold body 102. There is no specific requirement, as long as the probe of the temperature detection unit is aligned with the injection port. The control unit determines whether the injection port of the injection molding machine is leaking according to the result of the temperature detection unit. When the control unit determines that the injection port of the injection molding machine is leaking, the control switch K5 is closed, and the second coil J2 is energized to disconnect the normally closed contact K2.

[0027] Figure 3 The temperature change diagram around the injection port provided in this embodiment is shown in FIG. Figure 3As shown, since the injection cavity 103 needs to be preheated before injection molding, until the injection cavity 103 reaches the required temperature (within the T1 time period), injection molding can be performed afterwards, and the first predetermined time can be set according to the preheating time. Therefore, the temperature of the injection port will also rise first (T1 time period) and then maintain. In the T1 time period, the leakage detection and processing module 10 can be controlled not to work. Therefore, although the temperature rises sharply in the T1 time period, the function of the leakage detection and processing module 10 is not triggered. After the T1 time period, the leakage detection and processing module 10 starts to detect whether the injection port of the injection molding machine is leaking. The sampling time (T2 time period) is also set in the leakage detection and processing module 10. The T2 time period is continuously distributed after the first predetermined time. If the temperature fluctuation deviation detected by the temperature detection unit in any T2 time period is greater than the first predetermined value, it can be determined that the injection port of the injection molding machine is leaking.

[0028] In some embodiments, Figure 3 As shown, if the temperature fluctuation deviation of the injection port in any T2 time period is greater than the first predetermined value and the temperature rise duration exceeds the second predetermined value (T3 time period), it can be determined that the injection port of the injection molding machine is leaking. Among them, the second predetermined value is the anti-interference time, which is used to eliminate interference. For example, in some cases, the reason for the detection of drastic temperature fluctuations is not leakage, but interference, such as vibration, poor line contact, calculation errors, etc., which lead to inaccurate detection of the temperature detection unit. At this time, the temperature curve will recover quickly after the sharp fluctuation. Optionally, the second predetermined value is greater than or equal to 5s, but should not be limited to this.

[0029] Furthermore, after the leakage detection and processing module 10 loses power, if the leakage detection and processing module 10 is powered on within a second predetermined time (for example, 2 minutes), the leakage detection and processing module 10 continues to perform detection; if the leakage detection and processing module 10 is powered on outside the second predetermined time, the leakage detection and processing module 10 may start detecting whether the injection port of the injection molding machine is leaking after the first predetermined time.

[0030] Furthermore, the leakage detection and processing module 10 may also include an alarm unit, and when the leakage detection and processing module 10 detects leakage from the injection port of the injection molding machine, the alarm unit starts to alarm. The alarm unit is a buzzer alarm. In some embodiments, the alarm unit may be an audible and visual alarm provided by the injection molding machine, and when the leakage detection and processing module 10 detects leakage from the injection port of the injection molding machine, the alarm unit may be triggered to start to alarm.

[0031] In summary, in the leakage detection device of the injection molding machine provided in the embodiment of the present application, the injection molding machine includes an injection molding device, including a limit switch, a leakage detection and processing module, a first relay, a second relay and a third relay, the first relay includes a first coil and a first normally open contact, the second relay includes a second coil and a normally closed contact, the third relay includes a third coil and a second normally open contact, the second normally open contact is connected in series with the normally closed contact and then connected to the control circuit of the injection molding machine; the first coil and the third coil are connected in parallel and then in series with the limit switch and then connected between the positive electrode of the power supply and the negative electrode of the power supply, the first normally open contact is connected to the leakage detection After the detection and processing module is connected in series, one end is connected between the limit switch and the first coil, and the other end is connected to the negative electrode of the power supply. The leakage detection and processing module is also connected to the negative electrode of the power supply through the second coil; when the injection molding equipment is in place, the limit switch is closed synchronously, the first coil and the third coil are energized to close the first normally open contact and the second normally open contact, the injection molding machine starts to work, and the leakage detection and processing module starts to detect whether the injection port of the injection molding machine is leaking. When the leakage detection and processing module detects that the injection port of the injection molding machine is leaking, the second coil is energized, the normally closed contact is disconnected, and the injection molding machine stops working. The present application can effectively monitor whether the injection port of the injection molding machine is leaking. When the injection port of the injection molding machine is detected to be leaking, the injection molding machine can be conveniently and quickly controlled to stop working to ensure safe production. When the injection port of the injection molding machine is no longer leaking, the work can be simply and promptly resumed.

[0032] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0033] It should also be noted that, although the present application has been disclosed as above with preferred embodiments, the above embodiments are not intended to limit the present application. For any technician familiar with the art, without departing from the scope of the technical solution of the present application, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present application, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still falls within the scope of protection of the technical solution of the present application.

[0034] It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are merely used to distinguish between the various components, elements, steps, etc. in the specification, and are not used to indicate the logical relationship or sequential relationship between the various components, elements, steps, etc.

[0035] It should also be recognized that the terms described herein are only used to describe specific embodiments and are not used to limit the scope of the present application. It should be noted that the singular forms "one" and "a kind" used herein and in the appended claims include plural references unless the context clearly indicates the opposite meaning. For example, a reference to "a step" or "a device" means a reference to one or more steps or devices, and may include secondary steps and secondary devices. All conjunctions used should be understood in the broadest sense. And, the word "or" should be understood to have a definition of logical "or", rather than a definition of logical "exclusive or", unless the context clearly indicates the opposite meaning. In addition, the implementation of the method and / or device in the embodiment of the present application may include performing the selected task manually, automatically, or in combination.

Claims

1. A leakage detection device for an injection molding machine, the injection molding machine comprising an injection molding device, characterized in that: It includes a limit switch, a leakage detection and processing module, a first relay, a second relay and a third relay, wherein the first relay includes a first coil and a first normally open contact, the second relay includes a second coil and a normally closed contact, the third relay includes a third coil and a second normally open contact, and the second normally open contact is connected in series with the normally closed contact and then connected to the control circuit of the injection molding machine; The first coil is connected in parallel with the third coil and then connected in series with the limit switch, and then connected between the positive electrode and the negative electrode of the power supply; the first normally open contact is connected in series with the leakage detection and processing module, and one end is connected between the limit switch and the first coil, and the other end is connected to the negative electrode of the power supply; the leakage detection and processing module is also connected to the negative electrode of the power supply through the second coil; When the injection molding equipment is in place, the limit switch is closed synchronously, the first coil and the third coil are energized to close the first normally open contact and the second normally open contact, the injection molding machine starts to work, and the leakage detection and processing module starts to detect whether the injection port of the injection molding machine is leaking. When the leakage detection and processing module detects that the injection port of the injection molding machine is leaking, the second coil is energized, the normally closed contact is disconnected, and the injection molding machine stops working.

2. A leakage detection device for an injection molding machine as claimed in claim 1, characterized in that: The leakage detection and processing module includes a control unit, a temperature detection unit and a control switch. The temperature detection unit is used to detect the temperature of the shot port and send it to the control unit. The control unit determines whether the shot port of the injection molding machine is leaking according to the result of the temperature detection unit. When the control unit determines that the shot port of the injection molding machine is leaking, the control switch is closed and the second coil is energized.

3. A leakage detection device for an injection molding machine as claimed in claim 2, characterized in that: If the temperature fluctuation deviation of the injection port within a sampling time is greater than a first predetermined value, it is determined that the injection port of the injection molding machine is leaking material.

4. A leakage detection device for an injection molding machine as claimed in claim 2, characterized in that: If the temperature fluctuation deviation of the injection port within a sampling time is greater than a first predetermined value and the temperature rise duration exceeds a second predetermined value, it is determined that the injection port of the injection molding machine is leaking material.

5. A leakage detection device for an injection molding machine as claimed in claim 4, characterized in that: The second predetermined value is greater than or equal to 5s.

6. A leakage detection device for an injection molding machine as claimed in claim 1, characterized in that: The leakage detection and processing module further comprises an alarm unit. When the leakage detection and processing module detects leakage from the injection port of the injection molding machine, the alarm unit starts to alarm.

7. A leakage detection device for an injection molding machine as claimed in claim 1, characterized in that: The injection molding machine further comprises an alarm unit, and when the leakage detection and processing module detects leakage from the injection port of the injection molding machine, the alarm unit is triggered to start an alarm.

8. A leakage detection device for an injection molding machine as claimed in claim 1, characterized in that: After the leakage detection and processing module is powered on, it starts to detect whether there is leakage at the injection port of the injection molding machine after a first predetermined time.

9. A leakage detection device for an injection molding machine as claimed in claim 8, characterized in that: When the leakage detection and processing module loses power, if the leakage detection and processing module is powered on within the second predetermined time, the leakage detection and processing module continues to detect; if the leakage detection and processing module is powered on outside the second predetermined time, the leakage detection and processing module starts to detect whether there is leakage at the injection port of the injection molding machine after the first predetermined time.

Images