Temperature relay testing device

Abstract

The invention discloses a temperature relay testing device which is mainly composed of a drying oven and a temperature monitor provided with a plurality of stations, an internal PCB is arranged in the drying oven, an external PCB and power supply equipment are arranged outside the drying oven, a plurality of clamps used for clamping temperature sensors are arranged on the internal PCB, and a plurality of temperature sensors are arranged on the external PCB. A temperature sensing joint is arranged on each clamp; each temperature sensing joint is connected with one corresponding station, a plurality of acousto-optic units are arranged on the external PCB, and the internal PCB and the external PCB are respectively connected with a power supply device and a temperature monitor. The temperature sensing connector on the clamp can accurately monitor the temperature of the temperature relay in real time, meanwhile, the internal PCB is provided with the eight test jacks, so that the performance of eight temperature relays can be tested at a time, and compared with a conventional method for testing a single device at a time, the efficiency is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of testing, in particular to a temperature relay testing device. Background Art

[0002] The temperature relay is a controller that controls the on and off of subsequent circuits through temperature changes. It can protect other devices on the circuit from overheating and is widely used in various fields. High-precision temperature relays are particularly important for various devices on the circuit. They can accurately control the temperature so that the circuit and devices are not burned out. Therefore, it is very important to test the electrical performance of the temperature relay. The current conventional test method is the two-screen test method, that is, a single temperature relay to be tested is placed in the center of the high / low temperature box, and the temperature is slowly increased at a specified heating rate to observe the state change of the temperature relay. When the temperature relay is activated (open or closed), the temperature is the heating action temperature. Conversely, after completing the heating test, the temperature is reduced at a specified cooling rate to observe the state change of the temperature relay during the cooling process. When the temperature relay returns to the initial state (such as from open to closed or from closed to open), the temperature is the cooling recovery temperature.

[0003] When confirming the heating action temperature and cooling recovery temperature, temperature monitors and multimeters are used to monitor the temperature. Since the temperature relay has extremely high requirements for the rate of increase or decrease of the temperature of the high / low temperature box, the time for a single test is calculated in hours, which is very time-consuming. At the same time, since only one temperature relay can be tested each time, its test efficiency is very low and cannot meet the requirements of high efficiency at all.

[0004] In summary, the current two-screen test method for temperature relays cannot meet the requirements of high efficiency at all. How to effectively solve the above technical problems is an urgent task. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a temperature relay testing device.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a temperature relay testing device, which is mainly composed of an oven and a temperature monitor with a number of workstations, an internal PCB board is arranged inside the oven, an external PCB board and a power supply device are arranged outside the oven, a number of clamps for clamping temperature sensors are arranged on the internal PCB board, and a temperature sensing joint is arranged on each clamp; each temperature sensing joint is connected to one of the workstations corresponding to it, a number of sound and light units are arranged on the external PCB board, and the internal PCB board and the external PCB board are respectively connected to the power supply device and the temperature monitor.

[0007] Furthermore, the sound and light unit is composed of a current limiting resistor R, a buzzer LS and a light emitting diode D; one end of the current limiting resistor R is the input end of the sound and light unit and is connected to the output end of the power supply device; the other end of the current limiting resistor R is connected to the P pole of the light emitting diode D through the buzzer LS, and the N pole of the light emitting diode D is the output end of the sound and light unit.

[0008] The number of the acousto-optic units is the same as the number of the clamps and corresponds one to one.

[0009] To ensure the use effect of the present invention, the internal PCB board is connected to the external PCB board and the power supply device through a high temperature resistant flat cable.

[0010] To further ensure high temperature resistance, the internal PCB board and the external PCB board are both made of liquid crystal polymer, cyanate resin, polyethylene naphthalate or bismaleimide triazine resin.

[0011] The internal PCB board is also provided with test jacks whose number and positions correspond to the number and positions of the clamps, and the test jacks are composed of two metal holes.

[0012] The temperature sensing joint is in direct contact with the back plate of the temperature relay to be measured.

[0013] The temperature sensing joint is connected to the workstation via a temperature sensing line.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0015] 1. The temperature sensing joint on the fixture of the present invention can monitor the temperature of the temperature relay in real time and accurately. At the same time, the internal PCB board of the present invention is provided with 8 test jacks, so the performance of 8 temperature relays can be tested at one time. Compared with the conventional method of testing a single device at a time, its efficiency is significantly improved.

[0016] 2. The present invention adopts an acousto-optic unit as an indication basis for the operation of the temperature relay. When the temperature relay is turned on, the acousto-optic unit will make a sound and emit light, thereby reminding the tester to record the test data from the temperature monitor, which is convenient and quick.

[0017] 3. The internal PCB board of the present invention is placed at the inner center of the oven, which can ensure the accuracy of temperature measurement in the oven and make the test results more reliable.

[0018] 4. When the test jack of the present invention is used in conjunction with the fixture, it can detect temperature relays with different pin sizes and is applicable to testing occasions of various types of temperature relays. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the circuit structure of the acousto-optic unit of the present invention.

[0021] The reference numerals in the attached drawings are: 1. internal PCB board; 2. clamp; 3. metal socket; 4. copper wire inside the board; 5. temperature sensing line; 6. sealing insulation ring; 7. work station; 8. plug; 9. internal upper socket; 10. oven; 11. power supply equipment; 12. positive pole of power supply equipment; 13. negative pole of power supply equipment; 14. high temperature resistant flat cable; 15. internal lower socket; 16. external left socket; 17. external right socket; 18. external PCB board; 19. temperature monitor; 20. temperature sensing connector. DETAILED DESCRIPTION

[0022] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0023] Example

[0024] like Figure 1 As shown, the temperature relay test device described in this embodiment is mainly composed of an oven 10, a temperature monitor 19, an internal PCB board 1, an external PCB board 18, a power supply device 11, a temperature sensor and a socket 9. The internal PCB board 1 is arranged inside the oven 10, and the external PCB board 18, the temperature monitor 19 and the power supply device 11 are arranged outside the oven 10.

[0025] The oven 10 is also called a high / low temperature box, and its function is to accurately adjust and maintain a specific temperature so that the temperature relay to be tested is in a set temperature environment. The temperature monitor 19 is used to monitor and measure the temperature of the temperature relay to be tested in real time and provide data feedback. The temperature monitor 19 is arranged outside the oven 10, and a number of workstations 7 are arranged on the temperature monitor 19. The so-called "workstation" refers to the specific location or object where the temperature monitor 19 performs temperature monitoring. Each workstation represents an independent monitoring point and has a specific function and number identification.

[0026] The inner PCB board 1 is provided with an inner upper socket 9 and an inner lower socket 15, and the outer left socket 16 and the outer right socket 17 are provided on the outer PCB board 18, and a number of plugs 8 are provided on the inner upper socket 9, the inner lower socket 15, the outer left socket 16 and the outer right socket 17. It should be noted that the structures of the inner upper socket 9, the inner lower socket 15, the outer left socket 16 and the outer right socket 17 are the same, and the naming is only for the convenience of description and distinction.

[0027] The inner upper socket 9 of the inner PCB board 1 is connected to the negative electrode of the power supply device 11 through the high temperature resistant cable 14, the inner lower socket 15 is connected to the outer right socket 17 on the outer PCB board 18 through the high temperature resistant cable 14, and the outer left socket 16 on the outer PCB board 18 is connected to the positive electrode of the power supply device 11 through the high temperature resistant cable 14. When the high temperature resistant cable 14 passes through the wall of the oven 10, it needs to be processed by the sealing insulation ring 6 to achieve the purpose of heat insulation.

[0028] A number of clamps 2 are provided on the internal PCB board 1, and the clamps 2 are used to clamp the temperature sensor. At the same time, a temperature sensing joint 20 is provided on each clamp 2, and each temperature sensing joint 20 is connected to one of the workstations 7 through a temperature sensing line 5. That is, each temperature sensor transmits the temperature signal collected by it to the corresponding workstation 7 through the corresponding temperature sensing joint 20, so as to ensure that the workstation 7 serial number on the temperature monitor 19 can correspond to a specific clamp 2. Similarly, when these temperature sensing lines 5 pass through the wall of the oven 10, they also need to be processed through the sealing insulation ring 6 to achieve the purpose of heat insulation.

[0029] The internal PCB board 1 is provided with test sockets whose number and position correspond to the number and position of the fixtures 2. Each test socket is composed of two metal sockets 3, and the two metal sockets 3 are used to connect the two pins of the temperature relay to be tested. During the test, when the pins of the temperature relay to be tested are respectively connected to the two metal sockets 3, the temperature sensing connector 20 needs to be directly in contact with the back plate of the temperature relay to be tested so as to collect the temperature in real time. At this time, the temperature when the contacts inside each temperature relay to be tested are closed or opened will be displayed on the workstation 7 corresponding to the temperature monitor 19.

[0030] For ease of description, in this embodiment, the metal jack 3 located at the top of each test jack is called an upper metal jack, and the metal jack 3 located at the bottom is called a lower metal jack. All the upper metal jacks are connected to the plug 8 on the upper inner socket 9 through the corresponding inner copper wire 4 inside the internal PCB board 1, and all the lower metal jacks are connected to the plug 8 on the lower inner socket 15 through the corresponding inner copper wire 4 inside the internal PCB board 1.

[0031] A number of sound and light units are provided on the external PCB board 18. When the internal contacts of the temperature relay to be tested are turned on, the sound and light units will emit sound and light to remind the tester to record; conversely, when the internal contacts of the temperature relay to be tested are turned off, the sound and light units will stop emitting sound and light to remind the tester to record.

[0032] The number of the acousto-optic units needs to be the same as the number of the test jacks and they need to be matched one-to-one. Since each test jack corresponds to only one temperature relay to be tested, each acousto-optic unit also corresponds to one temperature relay to be tested.

[0033] The structures of the sound and light units are the same, and are composed of a current limiting resistor R, a buzzer LS and a light emitting diode D. Among them, one end of the current limiting resistor R is the input end of the sound and light unit, and is connected to the output end of the power supply device 11 through the external right socket 16; the other end of the current limiting resistor R is connected to the P pole of the light emitting diode D through the buzzer LS, and the N pole of the light emitting diode D is the output end of the sound and light unit; the output end of the sound and light unit is respectively connected to the plug 8 on the external right socket 17. The power supply device 11 is used to provide a 5V DC voltage to the sound and light unit to ensure the normal operation of the sound and light unit.

[0034] like Figure 2 As shown, in order to more clearly illustrate the structure of the sound and light unit, the sound and light units in this embodiment are set to 8, that is, the same number as the fixture 2 and the test jack, and correspond one to one. For the convenience of description, the current limiting resistor R of the first group of sound and light units is marked as R1, the buzzer LS is marked as LS1, the light emitting diode D is marked as D1, and so on.

[0035] In order to ensure the high temperature resistance of the internal PCB board 1 and the external PCB board 18 of the present invention, the internal PCB board 1 and the external PCB board 18 are both made of liquid crystal polymer, cyanate resin, polyethylene naphthalate or bismaleimide triazine resin.

[0036] During the test, the pins of the eight temperature relays to be tested are correspondingly plugged into the two metal sockets of the eight test sockets, and the temperature sensing connector 20 is in contact with the back plate of the temperature relay to be tested; then the oven 10 is turned on to make the temperature inside the oven 10 rise at a certain rate. When the temperature inside the oven 10 rises to a certain temperature value, the internal contacts of some temperature relays to be tested on the internal PCB board 1 will be closed, at which time, the two corresponding metal sockets 3 will be turned on, and a group of sound and light units corresponding to the fixture 2 will emit sound and light, thereby reminding the tester to record information such as the closing temperature value. Conversely, when the temperature inside the oven 10 drops to a certain temperature value, the internal contacts of some temperature relays to be tested on the internal PCB board 1 will be disconnected, at which time, the two corresponding metal sockets 3 will be disconnected, and a group of sound and light units corresponding to the fixture 2 will stop emitting sound and light, thereby reminding the tester to record information such as the disconnection temperature value.

[0037] When the above device is used, the values ​​of 8 temperature relays can be tested at one time, so its efficiency is very high. Of course, after adopting the above structure, the number of the fixture 2 and the sound and light unit can also be expanded as needed to achieve a one-time test of more temperature relays.

[0038] As described above, the present invention can be implemented better.

Claims

1. A temperature relay testing device, mainly composed of an oven (10) and a temperature monitor (19) provided with a plurality of workstations (7), characterized in that: An internal PCB board (1) is provided inside the oven (10), an external PCB board (18) and a power supply device (11) are provided outside the oven (10), a number of clamps (2) for clamping temperature sensors are provided on the internal PCB board (1), and a temperature sensing joint (20) is provided on each clamp (2); each temperature sensing joint (20) is connected to one of the workstations (7) corresponding thereto, a number of sound and light units are provided on the external PCB board (18), and the internal PCB board (1) and the external PCB board (18) are respectively connected to the power supply device (11) and the temperature monitor (19).

2. A temperature relay testing device according to claim 1, characterized in that: The sound and light unit is composed of a current limiting resistor R, a buzzer LS and a light emitting diode D; one end of the current limiting resistor R is the input end of the sound and light unit and is connected to the output end of the power supply device; the other end of the current limiting resistor R is connected to the P pole of the light emitting diode D through the buzzer LS, and the N pole of the light emitting diode D is the output end of the sound and light unit.

3. A temperature relay testing device according to claim 2, characterized in that: The number of the acousto-optic units is the same as the number of the clamps (2) and corresponds one to one.

4. A temperature relay testing device according to any one of claims 1 to 3, characterized in that: The internal PCB board (1) is connected to the external PCB board (18) and the power supply device (11) via a high temperature resistant flat cable (14).

5. A temperature relay testing device according to claim 4, characterized in that: The internal PCB board (1) and the external PCB board (18) are both made of liquid crystal polymer, cyanate resin, polyethylene naphthalate or bismaleimide triazine resin.

6. A temperature relay testing device according to claim 5, characterized in that: The internal PCB board (1) is also provided with test jacks whose number and positions correspond one-to-one to the number and positions of the clamps (2).

7. A temperature relay testing device according to claim 4, characterized in that: The temperature sensing joint (20) is in direct contact with the back plate of the temperature relay to be measured.

8. A temperature relay testing device according to claim 7, characterized in that: The temperature sensing joint (20) is connected to the work station (7) via a temperature sensing line (5).

9. A temperature relay testing device according to any one of claims 6 to 8, characterized in that: The test jack consists of two metal holes (3).

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