Heating wire collision short circuit alarm circuit
By using a short-circuit alarm circuit for heating wire collisions and monitoring the status of the heating wire with first and second alarm units, the problems of lag and false alarms caused by the heating wire getting stuck on the workpiece in vacuum coating equipment are solved, enabling timely shutdown and reducing equipment damage and economic losses.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HAC GENERAL SEMITECH CO LTD
- Filing Date
- 2025-08-28
- Publication Date
- 2026-08-04
AI Technical Summary
In existing vacuum coating equipment, when the heating wire catches the workpiece to be tested, the detection method has lag and false alarms, resulting in frequent shutdowns and affecting production capacity.
Design a heating wire collision short circuit alarm circuit, which monitors the working and non-working states of the heating wire through the first and second alarm units respectively, and forms a detection loop by grounding the workpiece and the cavity to achieve accurate alarm.
This avoids false alarms and delayed alarms when the heating wire comes into contact with the workpiece, allowing for timely shutdown and reducing equipment damage and downtime losses.
Smart Images
Figure CN224595161U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vacuum coating equipment, specifically to a heating wire collision short circuit alarm circuit. Background Technology
[0002] Vacuum coating equipment often requires the workpiece to be tested to move in a vacuum chamber. There is a heating wire inside the coating equipment. When heated, the heating wire will expand and contract, and the length of the heating wire will change. Due to the Ampere force, the heating wire will swing irregularly, which may catch the workpiece to be tested. If the workpiece is forcibly moved, it will cause damage to the heating wire.
[0003] Currently, when the heating wire breaks after catching on the workpiece, existing equipment detects the breakage by analyzing changes in resistance or by monitoring changes in the torque of the workpiece moving motor. Once changes in resistance and torque are detected, the host computer can stop the motor based on the signal.
[0004] However, when analyzing changes in resistance or detecting changes in the torque of a workpiece moving motor, a significant change in resistance or torque is required. This detection method has a significant lag. In addition, the resistance of the hot wire changes with increasing temperature. If the hot wire gets caught on the workpiece, the change in the workpiece's torque will not be obvious. The hot wire resistance monitoring or torque monitoring method is particularly prone to false alarms. Frequent false alarms leading to downtime can cause significant economic losses and affect production capacity. Utility Model Content
[0005] Based on this, the purpose of this utility model is to provide a heating wire collision short circuit alarm circuit, which aims to solve the problem that the detection method by monitoring the change of the workpiece moving motor torque has obvious lag, and that false alarms leading to shutdowns can cause significant economic losses and affect production capacity.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a heating wire collision short circuit alarm circuit, which includes a heating unit and a protection unit connected to the heating unit;
[0007] The heating unit includes a DC power supply for heating, a cavity, and heating wires respectively connected to the positive and negative terminals of the DC power supply for heating;
[0008] The protection unit includes a first alarm unit and a second alarm unit respectively connected between the negative terminal of the heating DC power supply and the outside of the cavity;
[0009] The cavity is grounded, the first alarm unit is used for short circuit alarm when the heating wire is working, and the second alarm unit is used for short circuit alarm when the heating wire is not working.
[0010] According to one aspect of the above technical solution, the first alarm unit includes a first resistor, a second resistor, and an amplifier connected between the negative terminal of the heating DC power supply and the outside of the cavity, the output terminal of which is connected to a programmable logic controller.
[0011] According to one aspect of the above technical solution, the first input terminal of the amplifier is connected between the first resistor and the second resistor, and the second input terminal of the amplifier is connected between the second resistor and the outside of the cavity.
[0012] According to one aspect of the above technical solution, the second alarm unit includes a switching power supply connected between the negative terminal of the heating DC power supply and the outside of the cavity, and a detection relay connected to the switching power supply, the detection relay being connected to a programmable logic controller.
[0013] According to one aspect of the above technical solution, the negative terminal of the switching power supply is connected to the negative terminal of the heating power supply, the positive terminal of the switching power supply is connected to the outside of the cavity, and the detection relay is located between the switching power supply and the outside of the cavity.
[0014] According to one aspect of the above technical solution, a first switching relay contact is provided between the negative terminal of the switching power supply and the heating power supply, and a second switching relay contact is provided between the switching power supply and the outside of the cavity. The first switching relay contact and the second switching relay contact are controlled by the programmable logic controller to switch between open and closed states.
[0015] In summary, the heating wire collision short-circuit alarm circuit proposed in this utility model uses a first alarm unit and a second alarm unit connected to the heating wire, respectively acting on the heating wire in its working and non-working states. This allows for accurate detection of whether the heating wire is in contact with the workpiece, avoiding false alarms, delayed alarms, and damage to the heating wire caused by it getting caught on the workpiece and failing to alarm in time. Specifically, by grounding the workpiece and the cavity to form a detection loop, the first and second alarm units monitor the heating wire's working and non-working states respectively. This ensures that an alarm is triggered when the heating wire collides with the workpiece or the metal cavity, immediately stopping the equipment and preventing damage to the heating wire and reducing downtime losses.
[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the assembly of the cavity and the electrode in one embodiment of the present invention;
[0018] Figure 2This is a schematic diagram showing the relative positions of the workpiece and the motor in one embodiment of the present invention;
[0019] Figure 3 This is the protection circuit of the first alarm unit in one embodiment of the present invention;
[0020] Figure 4 This is the protection circuit for the second alarm unit in one embodiment of the present invention.
[0021] Component symbol explanation in the attached diagram:
[0022] Heating DC power supply U1, cavity 10, heating wire 20, metal rod 30, electrode 40, workpiece 50, first resistor R1, second resistor R2, amplifier CF, programmable logic controller PLC, switching power supply U2, detection relay K, first switching relay contact QS1, first switching relay contact QS2, switch QS3. Detailed Implementation
[0023] To make the objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.
[0024] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "upper," "lower," and similar expressions used herein are for illustrative purposes only and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
[0025] In this utility model, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.
[0026] Please see Figures 1-4 The diagram shows a short-circuit alarm circuit for a heating wire 20 according to an embodiment of the present invention. This short-circuit alarm circuit includes a heating unit and a protection unit connected to the heating unit, wherein:
[0027] To address alarm lag and false alarms, and to ensure an alarm is triggered the instant the hot wire contacts the outer casing or workpiece 50, the heating unit includes a DC heating unit U1, a cavity 10, and heating wires 20 connected to the positive and negative terminals of the DC heating unit U1. Specifically, four electrode 40 connection holes are provided at the top of the wall, and ceramics are installed within these holes to insulate the cavity 10. An electrode 40 is fixed within each ceramic, and a heating wire 20 is connected to each electrode 40. The lower end of the heating wire 20 is connected via a metal rod 30, and the upper end of the electrode 40 is connected to the positive and negative terminals of the DC heating unit U1 via a cable.
[0028] Furthermore, in order to realize the short circuit alarm function of the heating wire 20, the protection unit includes a first alarm unit and a second alarm unit respectively connected between the negative terminal of the heating DC unit U1 and the outside of the cavity 10. The cavity 10 is grounded. The first alarm unit is used for short circuit alarm when the heating wire 20 is working, and the second alarm unit is used for short circuit alarm when the heating wire 20 is not working.
[0029] The first alarm unit includes a first resistor R1, a second resistor R2 connected between the negative terminal of the heating DC unit U1 and the outside of the cavity 10, and an amplifier CF. The output of the amplifier is connected to a programmable logic controller. The first input of the amplifier is connected between the first resistor R1 and the second resistor R2, and the second input of the amplifier is connected between the second resistor R2 and the outside of the cavity 10. Since the outside of the cavity 10 is grounded, when the heating wire 20 is working, the heating DC unit U1 supplies power to the heating wire 20. When the first resistor R1, the second resistor R2, and the amplifier are connected to the negative terminal of the heating DC unit U1, and the electrode 40 or the heating wire 20 is not in contact with the workpiece 50 or the cavity 10, there is no voltage difference between the negative terminal of the heating DC unit U1 and the ground, the potential difference between the two input terminals of the amplifier is 0, and the amplifier output is 0. When electrode 40 or heating wire 20 collides with workpiece 50 or cavity 10, heating wire 20 touches workpiece 50 (i.e., touches ground), and a voltage difference is generated between the negative terminal of the power supply and ground. This tiny voltage is amplified by an amplifier and becomes a 0-10V signal transmitted to the programmable logic controller (PLC). The PLC immediately prompts the system alarm and issues a stop motion command to prevent further damage to heating wire 20 or workpiece 50.
[0030] Furthermore, the second alarm unit includes a switching power supply U2 connected between the negative terminal of the heating DC unit U1 and the outside of the cavity 10, and a detection relay K connected to the switching power supply U2. The detection relay K is connected to a programmable logic controller (PLC). The negative terminal of the switching power supply U2 is connected to the negative terminal of the heating power supply, and the positive terminal of the switching power supply U2 is connected to the outside of the cavity 10. The detection relay K is located between the switching power supply U2 and the outside of the cavity 10. A first switching relay contact QS1 is provided between the switching power supply U2 and the negative terminal of the heating power supply, and a second switching relay contact QS2 is provided between the switching power supply U2 and the outside of the cavity 10. The first switching relay contact QS1 and the second switching relay contact QS2 are controlled by the PLC to switch between open and closed states.
[0031] When heating wire 20 is not working, the heating DC unit U1 does not output. The PLC controls the first switching relay contact QS1 and the second switching relay contact QS2 to close. At this time, the negative terminal of the heating power supply and the negative terminal of the external switching power supply U2 are connected. Simultaneously, the positive terminal of the external switching power supply U2 is connected to the detection relay K through the closed second switching relay contact QS2. When electrode 40 or heating wire fails to contact workpiece 50 or cavity 10, there is no current in the coil of detection relay K, the switch does not close, and detection relay K cannot form a closed circuit, thus failing to output an alarm signal. When electrode 40 or heating wire contacts workpiece 50 or cavity 10, it is equivalent to heating wire 20 touching ground. At this time, the switching power supply U2, electrode 40, heating wire 20, and detection relay K form a closed circuit. There is current in the coil of detection relay K, the switch closes, the PLC immediately prompts a system alarm and issues a stop command to prevent further damage to heating wire 20 or workpiece 50.
[0032] In summary, the heating wire collision short-circuit alarm circuit proposed in this utility model uses a first alarm unit and a second alarm unit connected to the heating wire, respectively acting on the heating wire in its working and non-working states. This allows for accurate detection of whether the heating wire is in contact with the workpiece, avoiding false alarms, delayed alarms, and damage to the heating wire caused by it getting caught on the workpiece and failing to alarm in time. Specifically, by grounding the workpiece and the cavity to form a detection loop, the first and second alarm units monitor the heating wire's working and non-working states respectively. This ensures that an alarm is triggered when the heating wire collides with the workpiece or the metal cavity, immediately stopping the equipment and preventing damage to the heating wire and reducing downtime losses.
[0033] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0034] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A short-circuit alarm circuit for heating wire collision, characterized in that, The heating wire collision short circuit alarm circuit includes a heating unit and a protection unit connected to the heating unit; The heating unit includes a DC power supply for heating, a cavity, and heating wires respectively connected to the positive and negative terminals of the DC power supply for heating; The protection unit includes a first alarm unit and a second alarm unit respectively connected between the negative terminal of the heating DC power supply and the outside of the cavity; The cavity is grounded, the first alarm unit is used for short circuit alarm when the heating wire is working, and the second alarm unit is used for short circuit alarm when the heating wire is not working.
2. The heating wire collision short-circuit alarm circuit according to claim 1, characterized in that, The first alarm unit includes a first resistor, a second resistor, and an amplifier connected between the negative terminal of the heating DC power supply and the outside of the cavity, the output of which is connected to a programmable logic controller.
3. The heating wire collision short-circuit alarm circuit according to claim 2, characterized in that, The first input terminal of the amplifier is connected between the first resistor and the second resistor, and the second input terminal of the amplifier is connected between the second resistor and the outside of the cavity.
4. The heating wire collision short-circuit alarm circuit according to claim 1, characterized in that, The second alarm unit includes a switching power supply connected between the negative terminal of the heating DC power supply and the outside of the cavity, and a detection relay connected to the switching power supply, the detection relay being connected to a programmable logic controller.
5. The heating wire collision short-circuit alarm circuit according to claim 4, characterized in that, A switch is provided between the detection relay and the programmable logic controller.
6. The heating wire collision short-circuit alarm circuit according to claim 5, characterized in that, The negative terminal of the switching power supply is connected to the negative terminal of the heating power supply, and the positive terminal of the switching power supply is connected to the outside of the cavity. The detection relay is located between the switching power supply and the outside of the cavity.
7. The heating wire collision short-circuit alarm circuit according to claim 6, characterized in that, A first switching relay contact is provided between the negative terminal of the switching power supply and the heating power supply, and a second switching relay contact is provided between the switching power supply and the outside of the cavity. The first switching relay contact and the second switching relay contact are controlled by the programmable logic controller to switch between open and closed states.