CN210923828U

CN210923828U - Portable steel sheet ground resistance test fixture

Info

Publication number: CN210923828U
Application number: CN201921368275.5U
Authority: CN
Inventors: 李凯; 蒋有平
Original assignee: Zhuhai Haixun Soft Multilayer Prototypes Co ltd
Current assignee: Zhuhai Haixun Soft Multilayer Prototypes Co ltd
Priority date: 2019-08-22
Filing date: 2019-08-22
Publication date: 2020-07-03
Anticipated expiration: 2029-08-22

Abstract

The utility model discloses a portable steel sheet ground connection resistance test fixture, including fuselage, needle frame and gland, fuselage package test module, indicating module and casing, indicating module and test module electric connection. The needle frame is detachably arranged on the shell, a plurality of probes penetrate through the needle frame, and the pressing cover is hinged to one side of the machine body. During testing, a product is placed on the needle frame, the gland is turned over and buckled on the needle frame, the steel sheet is in good contact with the probe, the steel sheet is connected into the testing module to test the grounding resistance of the steel sheet, and the result is displayed through the indicating module. According to the utility model discloses portable steel sheet ground connection resistance test fixture, portable, and the test of the ground connection resistance that can once only accomplish a plurality of steel sheets to through pilot lamp group visual display result, directly perceived can save time again.

Description

Portable steel sheet ground resistance test fixture

Technical Field

The utility model relates to a test fixture field, in particular to portable steel sheet ground connection resistance test fixture.

Background

With the development of science and technology, electronic consumer products are more and more popular in people's daily life, and the functions of various electronic products are more and more abundant. To realize a wide variety of functions in order to satisfy customer demands, different circuit modules are required, steel sheets are often used in the modules for bearing or reinforcing, and the grounding resistance of some modules to the steel sheets has special requirements. The traditional test tool can only test the grounding resistance of one steel sheet at a time, and the test result is often displayed by numerical values, which is not intuitive enough and has low efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve one of the technical problem that exists among the prior art at least, provide a portable steel sheet ground connection resistance test fixture, the ground connection resistance that can once measure a plurality of steel sheets to through test indicator group visual display test result.

According to the utility model provides a portable steel sheet ground connection resistance test fixture, include: a machine body, a needle frame and a gland,

the machine body comprises a test module, an indication module and a shell, the test module is arranged in the shell, the indication module is arranged on the shell, the test indication module is electrically connected with the test module,

the needle frame is detachably arranged on the shell, a plurality of probes penetrate through the needle frame and are electrically connected with the testing module,

the gland is hinged to one side of the machine body and can be turned over and buckled on the needle frame.

Above-mentioned portable steel sheet ground resistance test fixture has following beneficial effect: the steel sheet module that will test places on the needle frame of fuselage, with gland upset lock to the needle frame on, pushes down and makes every steel sheet and probe contact for in the test circuit on steel sheet electric connection test module, the instruction module shows the test result, can once only accomplish the ground resistance test of a plurality of steel sheets, save time, and the test result is directly perceived.

Furthermore, the testing device also comprises a battery box, wherein the battery box is arranged at one corner of the lower surface of the shell, and the battery box is electrically connected with the testing module. The battery is used for power supply, and the carrying is convenient.

Further, the needle frame is provided with at least two positioning pins. The probe is matched with a positioning hole on the steel sheet group for use, so that the probe is in good contact with the steel sheet, and the accuracy of a test result is ensured.

Furthermore, the machine body is provided with a fixing pin, and the gland is provided with a fixing hole matched with the fixing pin. The positioning device is used for positioning when the gland is turned over to the needle frame for pressing, and ensures that the steel sheet and the probe are in good contact under the action of the gland.

Further, the indicating module comprises a test indicating lamp group, a power supply indicating lamp and a low-voltage indicating lamp. The pilot lamp in the test indicator lamp group is used for displaying the test result, and whether power indicator lamp instruction battery is installed well, and the low-voltage pilot lamp then opens low-voltage warning effect, can cause the measuring result inaccurate when the battery power is not enough to lead to the low-voltage.

Further, the probe is connected to the test module through a wire. The layout of the probes on the needle frame can be changed conveniently by flying the threads, and the steel sheet sets with other layout specifications can be tested only by changing the positions of the holes for penetrating the probes on the needle frame, so that the application is flexible.

Further, the gland area is not smaller than the needle frame area. And each steel sheet module can be well pressed by the pressing cover, so that the probe is in good contact with the steel sheet.

Furthermore, the test module comprises a plurality of voltage comparison circuits which are independent of each other, each voltage comparison circuit comprises an operational amplifier and a plurality of resistors, the reverse input end of the operational amplifier is connected with a reference voltage, the same-direction input end of the operational amplifier is connected with a steel sheet, and the output end of the operational amplifier is connected with the indication module. The resistance value is converted into voltage to be measured, and the voltage is compared with reference voltage through a voltage comparison circuit to judge whether the resistance value of the steel sheet is within a threshold value.

Drawings

The present invention will be further described with reference to the accompanying drawings and examples;

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of the relationship between the steel sheet and the probe when the embodiment of the present invention is in use;

fig. 3 is a schematic diagram of a test module according to an embodiment of the present invention.

Reference numerals:

a body 10, a battery box 11, a test indicator light set 12, a power indicator light 13, a low voltage indicator light 14, a fixing pin 15,

a needle frame 20, a probe 21, a positioning pin 22,

the pressing cover 30, the fixing hole 31, the hinge 32,

a steel sheet 40.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1, according to the utility model discloses an embodiment provides a portable steel sheet ground resistance test fixture, including fuselage 10, needle frame 20 and gland 30. The inside test module that is provided with of casing of fuselage 10 still is equipped with battery case 11 that is used for the power supply of whole frock, and in this embodiment, battery case 11 sets up the casing lower right corner at fuselage 10. The needle frame 20 is detachably installed on the upper surface of the shell of the body 10, a plurality of probes 21 penetrate through the needle frame 20, in the embodiment, every two probes 21 are a set of steel sheets to be tested, and the number and the distribution of the probes 21 are matched with the number and the positions of the steel sheets on a product to be tested. The needle frame 20 is provided with at least two positioning pins 22 for positioning the product to be tested, and in this embodiment, it is preferable that the needle frame 20 is provided with four positioning pins 22, the positions of which are also distributed according to the product to be tested. The pressing cover 30 is hinged to one side of the housing of the body 10, and in the present embodiment, the pressing cover 30 is hinged to the housing of the body 10 by a hinge 32. The gland 30 may be flip-snapped to the needle holder 20 by a hinge 32, and preferably, in this embodiment, the gland 30 has an area larger than that of the needle holder 20. The upper surface of the housing of the body 10 is further provided with an indicating module connected with the testing module for indicating the testing result. In the present embodiment, the indication module preferably includes a test indicator light set 12, a power indicator light 13 and a low voltage indicator light 14. The number of lamps in the test indicator light set 12 corresponds to the number of steel sheet modules of the product to be tested, and in this embodiment, there are 10 modules, each having one steel sheet. And if the indicator light is not lightened, the test is not passed. The power indicator 13 indicates whether the battery is installed, the low-voltage indicator 14 is lighted when the voltage is low, the voltage is not enough, the test result may have deviation, and the battery replacement is reminded.

Preferably, the probe 21 and the circuit board are connected by a wire, and the needle holder 20 is made of bakelite, so that the processing is convenient and the cost is low. Testing of different specifications of products can be accomplished by replacing the needle carriage 20. Preferably, in this embodiment, the upper surface of the housing of the body 10 is provided with a fixing pin 15, and correspondingly, the pressing cover 30 is provided with a fixing hole 31, when the pressing cover 30 is turned over onto the needle frame 20, the fixing pin 15 can be inserted into the fixing hole 31, so that the pressing cover 30 can better press the product to be tested, and good contact between the steel sheet and the probe 21 is ensured.

The relationship of the gland 30, steel plate 40 and probe is shown in figure 2 when tested. Firstly, a test product is placed on the needle frame 20, then the gland 30 is turned over to be buckled on the needle frame 20, the steel sheets 40 are in contact with the probes 21, the grounding copper surface on each steel sheet is in contact with the corresponding probe 21, the steel sheets 40 are connected into a test circuit on a circuit board to test whether the grounding resistance value is within a threshold value or not, and the result is displayed through the test indicator lamp group 12.

Referring to fig. 3, a schematic diagram of a test module according to an embodiment of the present invention is shown. In this embodiment, the test circuit tests whether the ground resistance of the steel sheet in a module is within the threshold, in the figure, PINs 1-PINs 20 correspond to 20 probes 21 grouped in pairs, wherein PINs 1 and PINs 2 are grouped, PINs 3 and PINs 4 are grouped, and so on, and L1-L10 respectively correspond to the test indicator lamps of 10 modules in this embodiment. U1-U3 are integrated chips MC3302LD with four operational amplifiers. During testing, the steel sheet is contacted with the probe, the steel sheet is connected to the equidirectional input end of the operational amplifier, the reverse input end of the operational amplifier is connected with a reference voltage, whether the grounding resistance value of the steel sheet is within a required threshold value is judged by comparing the voltage value of the input end, and a high level or a low level is output according to a comparison result, so that a lamp connected to the output end of the operational amplifier is turned on or off to inform the test result. In this embodiment, the light on indicates that the test passed, and the light off indicates that the test failed. The circuits connected to the two input terminals of the operational amplifier are both series resistor voltage-dividing circuits, wherein the size of each resistor needs to be selected according to specific test requirements, which is not described in detail herein. In this embodiment, the third operational amplifier of U3 is used to determine if the voltage is low, and has an input terminal connected to the power supply voltage, another terminal connected to the reference voltage, and an output terminal connected to the low voltage indicator 14. The fourth op-amp of U3 is idle, with both inputs connected to ground. It is understood that the U1-U3 may also be selected from operational amplifier integrated chips of other specifications.

According to the embodiment of the utility model provides a pair of portable steel sheet ground connection resistance test fixture, through battery powered, portable to whether the ground connection resistance that can a plurality of steel sheets of disposable test is in the threshold value, and demonstrates the test result through test indicator banks, convenient directly perceived again can save time.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. The utility model provides a portable steel sheet ground connection resistance test fixture which characterized in that includes: a machine body, a needle frame and a gland,

the machine body comprises a test module, an indication module and a shell, the test module is arranged in the shell, the indication module is arranged on the shell, the indication module is electrically connected with the test module,

2. The tool for testing the grounding resistance of the portable steel sheet according to claim 1, further comprising a battery box, wherein the battery box is arranged at one corner of the lower surface of the shell, and the battery box is electrically connected with the testing module.

3. The tool for testing the grounding resistance of the portable steel sheet according to claim 1, wherein at least two positioning pins are arranged on the needle frame.

4. The tool for testing the grounding resistance of the portable steel sheet according to claim 1, wherein a fixing pin is arranged on the body, and a fixing hole matched with the fixing pin is arranged on the gland.

5. The tool for testing the grounding resistance of the portable steel sheet according to claim 1, wherein the indicating module comprises a test indicating lamp set, a power indicating lamp and a low-voltage indicating lamp.

6. The tool for testing the grounding resistance of the portable steel sheet according to claim 1, wherein the probe is connected to the testing module through a wire.

7. The tool for testing the grounding resistance of the portable steel sheet according to claim 1, wherein the area of the gland is not smaller than that of the needle frame.

8. The tool for testing the grounding resistance of the steel sheet according to claim 1, wherein the testing module comprises a plurality of voltage comparison circuits which are independent of each other, each voltage comparison circuit comprises an operational amplifier and a plurality of resistors, the reverse input end of the operational amplifier is connected with a reference voltage, the same-direction input end of the operational amplifier is connected with the steel sheet, and the output end of the operational amplifier is connected with the indicating module.