Push rod service life testing device

Abstract

The utility model provides a push rod service life testing device, which comprises a control module, a sampling module, a driving module and a power supply module, the control module controls the push rod to be tested to move through the driving module; the driving module is connected with the control module and a to-be-tested push rod and is used for driving the to-be-tested push rod to move; the sampling module is connected with the driving module and the control module and is used for acquiring the running current of the push rod to be tested in the testing process; and the power supply module is connected with the sampling module, the driving module and the control module and is used for supplying power to the sampling module, the driving module and the control module. The push rod service life testing device provided by the embodiment of the utility model can realize automatic testing of the service life of the push rod, can be suitable for push rods of various different types, and can judge whether the push rod is abnormal or not in the testing process without additionally providing a tool.

Description

Technical Field

[0001] The utility model relates to a testing device, in particular to a life testing device for an electric push rod. Background Art

[0002] Electric linear actuators are widely used in the home, such as cabinet doors, home appliance doors, etc. However, there is no universal test device to measure the service life of different electric linear actuators, such as those with limit switches or without limit switches. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a push rod life test device which can automatically test the life of different types of push rods.

[0004] The utility model solves the above technical problems through the following technical solutions: a push rod life test device, characterized in that it includes a control module, a sampling module, a driving module, and a power supply module;

[0005] The control module controls the movement of the push rod to be tested through the drive module;

[0006] The driving module is connected to the control module and the push rod to be tested, and is used to drive the movement of the push rod to be tested;

[0007] The sampling module is connected to the driving module and the control module and is used to collect the operating current of the push rod to be tested during the test;

[0008] The power supply module is connected to the sampling module, the driving module and the control module, and is used to provide power to the sampling module, the driving module and the control module.

[0009] Preferably, the sampling module comprises a current-voltage conversion circuit, an operational amplifier circuit and an AD conversion circuit, which are used to convert the operating current of the push rod to be tested into a voltage signal and input it into the control module.

[0010] Preferably, the driving module has two outputs, which are respectively used to adapt to 4PIN and 2PIN push rods.

[0011] Preferably, when the push rod to be tested has a Hall sensor, the output end of the Hall sensor is connected to the control module, and the control module determines the operating state of the push rod to be tested together with the sampling module according to the output value of the Hall sensor.

[0012] Preferably, it further comprises an input module connected to the control module and used for inputting control parameters.

[0013] Preferably, it further comprises a display module, which is connected to the control module and is used to display the input control parameters, test status and remaining test time.

[0014] Preferably, the power module is provided with a protection circuit for receiving an input voltage within 24V.

[0015] Preferably, the protection circuit includes a rectifier circuit and a step-down circuit.

[0016] Preferably, the control module is connected to the host computer via a communication module.

[0017] Preferably, the sampling modules and the driving modules are provided in multiple groups for simultaneously connecting and testing multiple push rods to be tested.

[0018] The positive progressive effect of the present invention is that the push rod life test device of the embodiment of the present invention can realize automatic testing of the push rod life, can be applicable to a variety of different types of push rods, and can also determine whether the push rod has an abnormality during the test without the need for additional tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of a push rod testing device according to an embodiment of the present invention.

[0020] Figure 2 The figure is a circuit diagram of a power module of a push rod testing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0022] like Figure 1 As shown, the push rod life test device of the embodiment of the utility model includes a control module, a sampling module, a driving module, and a power supply module;

[0023] The control module controls the movement of the push rod to be tested through the driving module; the control module includes a main control MCU and peripheral circuits.

[0024] The driving module is connected to the control module and the push rod to be tested, and is used to drive the movement of the push rod. The driving module includes a driving circuit, and preferably, a chip similar to Toshiba's TB67H450FNG can be used, with two outputs. The two outputs are respectively for a 2PIN push rod, that is, a push rod with a limit switch, and a 4PIN push rod, that is, a push rod without a limit switch. The limit switch can be used to determine whether the push rod has reached a set limit position.

[0025] The sampling module is connected to the driving module and the control module, and is used to collect the operating current of the push rod during the test; the sampling module includes a current-to-voltage conversion circuit, an operational amplifier circuit and an AD conversion circuit, which are used to convert the operating current of the push rod during the collection test into a voltage signal and input it into the control module.

[0026] Specifically, the sampling circuit is connected to the driving module, for example, it can be connected to the current output terminal in the driving circuit, for collecting the operating current during the test, and converting the operating current into a voltage signal through a series resistor, and inputting it into the control module. The sampling module does not use the sampling circuit that comes with the TB67H450FNG chip, but converts the current into a voltage signal through an operational amplifier circuit alone. The reason for using the conversion between current and voltage is that the control module generally uses an MCU chip, and the MCU chip cannot sample and input the current. Therefore, the operating current is converted into a voltage signal and input into the signal that can be recognized by the MCU chip of the control module for sampling control. At the same time, the sampling module includes an operational amplifier circuit and an AD conversion circuit, which converts the voltage signal into a digital signal that matches the signal range that the back-end chip can receive.

[0027] The power supply module is connected to the sampling module, the driving module and the control module, and is used to provide power to the sampling module, the driving module and the control module.

[0028] The power module, such as Figure 2 As shown, it includes a protection circuit, which includes a rectifier circuit and a step-down circuit. Through the protection circuit, a commonly used voltage below 24V is introduced, so the power module can adapt to a commonly used 24V adapter and protect the back-end chip. When the push rod is blocked and a large current is generated, it is ensured that the back-end chip can withstand a sufficiently large current.

[0029] The control module can also calculate the stall current according to the running current of the push rod, and then determine whether the push rod to be tested is damaged according to the stall current and the stall time. For example, the current output of the driving module collected from the input end of the sampling module is I, and the voltage value U is obtained through the series resistor. The operational amplifier circuit converts the voltage into the range Vad that the MCU chip can collect. For example, according to Vad=aU+2.147, the MCU chip converts the voltage value into a current value, which is the stall current. That is, I stall=R×(Vad-2.147) / a, R is the series resistance value, and a is the conversion parameter of the operational amplifier circuit.

[0030] When the push rod is blocked, the blocking current is much greater than the current when it is opened and closed. The blocking time is counted from when the blocking current is greater than the preset threshold. If the blocking time is within the preset time range, the push rod is considered to be in a normal state. If the blocking time is greater than the preset time, the push rod may be abnormal, and the preset time period can be used as the observation period. If there are three consecutive abnormal observation periods, the push rod is considered to be failed.

[0031] The control module can also set the number of automatic tests according to manual parameter input.

[0032] When the push rod to be tested has a Hall sensor, the output end of the Hall sensor is connected to the control module, and the control module determines the operating state of the push rod together with the sampling module according to the output value of the Hall sensor. The Hall sensor is used to sense the specific length of the push rod extension, so the operating state of the push rod can be determined based on the signal of the Hall sensor combined with the sampling module.

[0033] The push rod life test device also includes an input module connected to the control module for inputting control parameters, such as the number of tests. The input module can be a button, a touch screen, etc.

[0034] The push rod life test device also includes a display module, which is connected to the control module and includes a display drive circuit and a display screen, and is used to display the input control parameters, test status and remaining test time. The remaining test time = (push rod opening time + push rod stopping time + push rod closing time) × (set number of times - completed number of times). Of course, those skilled in the art can also set the displayed content as needed.

[0035] The control module is connected to the host computer via a communication module, and preferably, the communication module is a commonly used serial communication module. The host computer can be a PC, or a mobile phone, a server, etc.

[0036] The push rod life test device of the embodiment of the utility model can realize automatic testing of the push rod life, can be applicable to a variety of different types of push rods, and can also determine whether the push rod has an abnormality during the test without the need for additional tooling.

[0037] As another implementable push rod life test device of the present invention, on the basis of the above embodiment, the sampling module and the driving module can be provided in multiple groups for simultaneously connecting and testing multiple push rods to be tested.

[0038] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A push rod life test device, characterized in that: It includes a control module, a sampling module, a driving module, and a power module; The control module controls the movement of the push rod to be tested through the drive module; The driving module is connected to the control module and the push rod to be tested, and is used to drive the movement of the push rod to be tested; The sampling module is connected to the driving module and the control module and is used to collect the operating current of the push rod to be tested during the test; The power supply module is connected to the sampling module, the driving module and the control module, and is used to provide power to the sampling module, the driving module and the control module.

2. The push rod life test device according to claim 1, characterized in that: The sampling module includes a current-voltage conversion circuit, an operational amplifier circuit and an AD conversion circuit, and is used to convert the operating current of the push rod to be tested into a voltage signal and input it into the control module.

3. The push rod life test device according to claim 1, characterized in that: The driving module has two outputs, which are used to adapt to 4PIN and 2PIN push rods respectively.

4. The push rod life test device according to claim 1, characterized in that: When the push rod to be tested has a Hall sensor, the output end of the Hall sensor is connected to the control module, and the control module determines the operating state of the push rod to be tested together with the sampling module according to the output value of the Hall sensor.

5. The push rod life test device according to claim 1, characterized in that: It also includes an input module connected to the control module and used for inputting control parameters.

6. The push rod life test device according to claim 5, characterized in that: It also includes a display module, which is connected to the control module and is used to display the input control parameters, test status and remaining test time.

7. The push rod life test device according to claim 1, characterized in that: The power module is provided with a protection circuit for receiving an input voltage within 24V.

8. The push rod life test device according to claim 7, characterized in that: The protection circuit includes a rectifier circuit and a step-down circuit.

9. The push rod life test device according to any one of claims 1 to 8, characterized in that: The control module is connected to the host computer via the communication module.

10. The push rod life test device according to any one of claims 1 to 8, characterized in that: The sampling module and the driving module are provided in multiple groups for simultaneously connecting and testing multiple push rods to be tested.

Images