Protection device for durability test bench

Abstract

The utility model relates to a protection device for a durability test bench, the durability test bench comprises an upper controller and a durability test unit, the upper controller is used for controlling the operation of the durability test unit, the protection device comprises a protection controller and a relay, and the relay is used for controlling the operation of the durability test unit. The relay is installed in a circuit of the durability test unit in series, the protection controller is connected with the upper controller, and the protection controller is connected with the relay and used for controlling on-off of the relay. According to the utility model, the power supply of the detected piece can be cut off in time by detecting the abnormal communication of the upper controller, so that the occurrence of uncontrollable risks is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to detection technical field, concretely relates to a protection device for durability test bench. BACKGROUND

[0002] Durability test is a necessary step before many products are sold, which is used to inform consumers of the average service life of the product. Durability test is often a time-consuming test, and the existing durability test is usually controlled by a host computer, and the corresponding test process is executed, so the operator does not need to be present in real time. However, during this process, if the host computer crashes or abnormally interrupts communication, the test bench may have uncontrollable factors, which may cause the test piece to be damaged. Therefore, during the durability test process, a protection device is urgently needed to prevent the above-mentioned situations from occurring. SUMMARY

[0003] The utility model discloses a protection device for durability test bench to overcome the defects of the prior art.

[0004] In order to achieve the purpose of the utility model, the present application provides the following technical scheme.

[0005] In a first aspect, the present application provides a protection device for a durability test bench, the durability test bench comprising a host controller and a durability test unit, the host controller being used to control the operation of the durability test unit, the protection device comprising a protection controller and a relay, the relay being installed in series in the circuit of the durability test unit, the protection controller being connected with the host controller, and the protection controller being connected with the relay and being used to control the on-off of the relay. During normal test process, the host controller controls the normal operation of the durability test unit, and the host controller sends a signal to the protection controller every fixed period of time, and the protection controller receives the signal to indicate that the host controller is in normal operation state and will not issue an instruction. When the host controller fails, the signal sent by the host controller to the protection controller will be abnormal or will no longer send a signal, at this time, the protection controller will issue an instruction to make the relay open, and since the relay is connected in series in the circuit of the durability test unit, the opening of the relay will forcibly cut off the circuit of the durability test unit, thereby terminating the test and protecting the test piece.

[0006] In an embodiment of the first aspect, the protection controller and the host controller are connected through Ethernet.

[0007] In an embodiment of the first aspect, the protection controller adopts a PLC controller.

[0008] In an embodiment of the first aspect, the protection device is provided with a low-voltage power supply, and the protection controller and the relay are connected in parallel across the low-voltage power supply, and the low-voltage power supply is used to supply power to the controller and the relay.

[0009] In an embodiment of the first aspect, the low-voltage power supply is connected in series with the IO switch and the emergency stop reset switch in the connection circuit of the relay. The emergency stop reset switch is provided to provide manual emergency power-off and reset after communication exception troubleshooting.

[0010] In an embodiment of the first aspect, the PLC controller and the IO switch are connected in communication by using the modbus protocol.

[0011] Compared with the prior art, the utility model has the beneficial effects that:

[0012] The application can detect communication abnormalities of the upper controller, and cut off the power supply of the measured object in time, thereby reducing the occurrence of uncontrollable risks. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a circuit connection diagram of the protection device.

[0014] In the drawings, 1 is a durability test unit, 2 is an upper controller, 3 is a switch, 4 is a PLC controller, 5 is a low-voltage power supply, 6 is a relay, 7 is an emergency stop reset switch, and 8 is an IO switch. DETAILED DESCRIPTION

[0015] Unless otherwise defined, technical or scientific terms used in the specification and claims should be understood as having the meaning commonly understood by one of ordinary skill in the art to which the utility model belongs. All numerical values recited herein, from the lowest value to the highest value, refer to all numerical values obtained by increasing the lowest value to the highest value by one unit when the difference between the lowest value and the highest value is two units or more.

[0016] The specific embodiments of the utility model will be described below. It should be noted that, in the specific description of these embodiments, the specification cannot describe all the features of the actual embodiments in detail for the sake of brevity and conciseness. Those skilled in the art can modify and replace the embodiments of the utility model without departing from the spirit and scope of the utility model, and the resulting embodiments are also within the protection scope of the utility model. EMBODIMENT

[0017] The embodiments of this utility model will be described in detail below. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments. Example

[0018] A protective device for a durability testing bench, the circuit connection of which is as follows: Figure 1 As shown, the circuit mainly consists of two parts: a test circuit and a protection circuit. The test circuit is existing technology and is applicable to all durability tests. It includes a host controller 2 and a durability test unit 1. The principle is that under the control of the host controller 2, the durability test unit 1 can automatically complete the durability test of the test piece. Since this part is not within the scope of protection of this application and is existing technology, it will not be described in detail in this embodiment.

[0019] In the test circuit, a relay 6 is connected in series and is also connected to the protection circuit. Specifically, the relay 6 and the PLC controller 4 are connected in parallel across the 24V low-voltage power supply 5, and an I / O switch 8 and an emergency stop reset switch 7 are connected in series in the connection circuit between the relay 6 and the low-voltage power supply 5. The PLC controller 4 is connected to the host controller 2 via a switch 3 and a network cable, and the PLC controller 4 and the I / O switch 8 communicate using the Modbus protocol.

[0020] The working principle of this protection device is as follows:

[0021] During normal durability testing, the host controller 2 sends a signal to the PLC controller 4 every 10 seconds (which can be set according to actual needs). After receiving the signal, the PLC controller 4 does not issue any instructions. At this time, the IO switch 8 remains closed, the emergency stop reset switch 7 remains closed, and the relay 6 is connected to the low-voltage power supply 5, that is, the relay 6 is energized, thereby connecting the test circuit. The durability test unit 1 operates normally under the control of the host controller 2.

[0022] When the host controller 2 crashes or a communication error occurs, it will be unable to send a signal to the PLC controller 4 every 10 seconds. At this time, the PLC controller 4 will issue a command to disconnect the IO switch 8, thereby disconnecting the relay 6 from the low-voltage power supply 5. That is, the relay 6 loses power, the test circuit is disconnected, and the durability test unit 1 stops running, thus protecting the device under test.

[0023] When an emergency occurs and it is necessary to stop the endurance test manually, the operator presses the emergency stop reset switch 7, at this time, the connection between the relay 6 and the low-voltage power supply 5 is disconnected, that is, the relay 6 loses power, the test circuit is disconnected, and the endurance test unit 1 stops running, thereby protecting the tested part. When the emergency is eliminated, the emergency stop reset switch 7 is reset, and the endurance test can be restarted.

[0024] The above description of the embodiments is to facilitate the understanding and application of the present application by those of ordinary skill in the art. Those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without having to make creative efforts. Therefore, the present application is not limited to the embodiments described herein, and improvements and modifications made by those skilled in the art based on the disclosure of the present application without departing from the scope and spirit of the present application are within the scope of the present application.

Claims

1. A protection device for a durability test bench, the durability test bench comprising an upper controller for controlling operation of a durability test unit, and the durability test unit, characterized in that, The protection device comprises a protection controller and a relay, the relay is installed in series in a circuit of the endurance test unit, the protection controller is connected with an upper controller, and the protection controller is connected with the relay and used for controlling on-off of the relay.

2. The protection device for a durability test bench of claim 1, wherein, The protection controller is connected with the upper controller through Ethernet.

3. Protection device for a durability test bench according to claim 1 or 2, characterized in that, The protection controller adopts a PLC controller.

4. The protection device for a durability test bench of claim 1, wherein, The protection device is provided with a low-voltage power supply, the protection controller and the relay are connected in parallel at two ends of the low-voltage power supply, and the low-voltage power supply is used for supplying power to the controller and the relay.

5. The protection device for a durability test bench of claim 4, wherein, IO switches and emergency stop reset switches are connected in series on a connection circuit of the low-voltage power supply and the relay.

6. The protection device for a durability test bench of claim 5, wherein, The protection controller and the IO switches are connected in communication through a modbus protocol.

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