Pressure testing apparatus and method of testing

Abstract

The application discloses a kind of pressure test equipment and its test method, and the pressure test equipment includes base, lifting mechanism, horizontally placed lifting plate, pressure test mechanism and fixture.Lifting mechanism is fixed on base by a vertical support;Lifting plate is connected to the drive shaft of lifting mechanism and is driven to do lifting action by lifting mechanism, and lifting plate is provided with contact type power transmission structure;Pressure test mechanism synchronously does lifting action following lifting plate, and it includes support assembly fixed on the plate surface of lifting plate, step-by-step driving device installed on support assembly and pressure sensing assembly drivingly connected with step-by-step driving device, and Z-axis pressure rod of pressure sensing assembly is suspended to the outside of lifting plate;Fixture is detachably mounted on base, and has groove surface for positioning product to be tested on it, and Z-axis pressure rod can be pressed to groove surface after descending.The pressure test equipment of the application has high testing efficiency and accurate test.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure testing, in particular to a pressure testing device and a testing method thereof. BACKGROUND

[0002] As the input device of a notebook computer, the quality of a touchpad directly affects the operation of the electronic device, so it is necessary to test the performance of each key on the touchpad during the production process.

[0003] The following are the defects of the notebook computer touchpad testing method in the prior art:

[0004] 1. The conventional key function test operation of the touchpad generally adopts manual key pressing for testing, and this method cannot accurately test the key pressure change;

[0005] 2. The conventional testing method cannot accurately measure the specific value of the key switch resistance change, and the obtained test result is inaccurate. SUMMARY

[0006] In view of the deficiencies in the prior art, the technical problem to be solved by the present application is to provide a pressure testing device and a testing method thereof. The purpose of designing the pressure testing device is to measure the key pressure change value and the key switch resistance change value during the pressing process of the touchpad, and to determine whether the touchpad is qualified by the key pressure change value and the key switch resistance change value.

[0007] To solve the above technical problems, the present application realizes the following scheme: a pressure testing device of the present application, comprising a base, further comprising:

[0008] A lifting mechanism is fixed to the base by a vertical support;

[0009] A horizontal lifting plate is connected to the drive shaft of the lifting mechanism and is driven by the lifting mechanism to perform lifting action, and the lifting plate is provided with a contact type power transmission structure;

[0010] A pressure testing mechanism is installed on the lifting plate and performs lifting action synchronously with the lifting plate, which comprises a support assembly fixed to the surface of the lifting plate, a stepping drive device installed on the support assembly, and a pressure sensing assembly drivenly connected with the stepping drive device, and the Z-axis pressure rod of the pressure sensing assembly is suspended outside the lifting plate;

[0011] A jig is detachably installed on the base, and has a groove surface for positioning the product to be tested, and the Z-axis pressure rod can be pressed towards the groove surface after being lowered.

[0012] Further, the power source of the lifting mechanism is a linear cylinder, the piston rod of the linear cylinder is driven to connect the lifting plate downward, the plate surface of the lifting plate has at least one guide hole, a guide rod is arranged on each guide hole, the lower end of the guide rod is fixed on the base, and the upper end of the guide rod is fixed on the side of the vertical support through a connecting piece.

[0013] Further, the contact type power transmission structure is that two elastic needles are installed on the lifting plate, the two elastic needles are connected to an external power supply part, and the lower end of the two elastic needles can be in contact with the test point contact on the product to be tested after descending.

[0014] Further, at least one limiting pressure rod is installed at the lower end of the lifting plate.

[0015] Further, the support assembly includes a column fixed on the plate surface of the lifting plate, a position switch mounted on the column, and a step-by-step driving device mounting strip mounted on the column, and the step-by-step driving device is fixed on the step-by-step driving device mounting strip through a connecting block and is height-adjustable.

[0016] Further, the step-by-step driving device includes:

[0017] A motor base is fixed on the front side of the support assembly, and a Z-axis guide rail and a Z-axis screw rod are arranged on the motor base, and the Z-axis screw rod is rotatable;

[0018] A step motor is fixed on the top of the motor base, and the step motor is driven to connect the Z-axis screw rod;

[0019] A sliding seat is slidably connected to the Z-axis guide rail and is threadedly connected with the Z-axis screw rod.

[0020] Further, the pressure sensing assembly includes a pressure sensor mounted on the sliding seat and a Z-axis pressure rod mounted on the pressure sensor.

[0021] Further, the test method includes the following steps:

[0022] Step one, connect the base to the power supply and the gas source, and place the product to be tested into the groove surface of the jig;

[0023] Step two, turn on the power switch, open the gas source, and the system is self-checked, and the system detects whether the piston rod is at a preset height;

[0024] Step three, press the start switch, the linear cylinder drives the piston rod to descend, the piston rod synchronously drives the lifting plate to descend, and then the lifting plate synchronously drives the step-by-step driving device to descend;

[0025] After the lifting plate reaches the preset position, two elastic needles on the lifting plate and the key test point contacts on the product to be tested are in contact, so that the key contact resistance is detected.

[0026] In step four, the stepping drive device presses the product to be tested by the weight of the movable part, and the Z-axis pressing rod presses the key position of the product to be tested, wherein the weight of the movable part is smaller than the maximum stress value of the product to be tested, so that the key position of the product to be tested is not damaged.

[0027] During the pressing of the key position of the product to be tested, the key contact resistance is deformed and the circuit is turned on, so that the line resistance is reduced. During the change of the key contact resistance, the force F sensed by the pressure sensor is transmitted to the MCU processor in real time, and the waveform graph of F / t and the resistance change curve of the key contact resistance are displayed on the display screen.

[0028] In step five, the stepping motor is started, the stepping motor drives the Z-axis screw to stepwise rotate, the sliding seat is stepwise lifted upward, and the Z-axis pressing rod is lifted upward. During the self-recovery of the key position, the Z-axis pressing rod is pressed and the force F is sensed by the pressure sensor. The force F sensed by the pressure sensor is transmitted to the MCU processor in real time, and the waveform graph of F / t and the resistance change curve of the key contact resistance are displayed on the display screen.

[0029] The peak point a of the waveform graph of F / t, the valley point b of the waveform graph of F / t, the valley point c of the waveform graph of F / t, the peak point d of the waveform graph of F / t, and the key contact resistance change curve are used to determine whether the product to be tested is within the set interval value. If the product to be tested is out of the interval value, the product to be tested is determined to be unqualified. If the product to be tested is within the interval value, the product to be tested is determined to be qualified.

[0030] In step six, the components are reset, and the sliding seat is reset by contacting the reset switch.

[0031] In step seven, the product to be tested is taken out.

[0032] Compared with the prior art, the present application has the following advantages:

[0033] 1. The elastic needles are arranged on the lifting plate, so that the test needle is connected with the key test point of the product, and the key contact resistance is detected.

[0034] 2. The application adopts the stepping drive device to press the key position of the product to be tested by the weight of the moving part itself, so that the key pot piece resistance at the key position is deformed to change the resistance value, then the Z-axis pressure rod is stepped up by the rotation of the lead screw driven by the stepping motor, so that the key pot piece resistance at the key position restores to the original resistance value, in the process of deformation and restoration of the key pot piece resistance, the pressure sensor tests the pressure change in real time, the MCU processor detects the resistance value of the key pot piece resistance in real time, and then the waveform graph is formed on the display screen, the value generated on the waveform graph is compared with the preset resistance interval value and the force interval value, if the value generated on the waveform graph exceeds the preset resistance interval value and the force interval value, the product to be tested is unqualified product, if the value generated on the waveform graph is within the preset resistance interval value and the force interval value, the product to be tested is qualified product.

[0035] 3. The pressure testing equipment of the application has high testing efficiency and high testing accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the pressure testing equipment of the application.

[0037] Figure 2 It is a structural schematic diagram of the pressure testing equipment of the application.

[0038] Figure 3 It is the F / t waveform graph of the application.

[0039] Figure 4 It is the F / shift waveform graph of the application.

[0040] Figure 5 It is the R / t waveform graph of the application.

[0041] Markings in the drawings: base 1, limit pressure rod 2, lifting plate 3, vertical support 4, piston rod 5, guide rod 6, cylinder mounting plate 7, linear cylinder 8, column 9, in-place switch 10, stepping motor 11, sliding seat 12, connecting block 13, Z-axis pressure rod 14, Z-axis lead screw 15, spring needle 16, product to be tested 17, jig 18. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application, so that the advantages and characteristics of the application can be more easily understood by those skilled in the art, and the protection scope of the application can be more clearly and definitely defined. Obviously, the described embodiments of the application are only part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0043] In addition, the technical features involved in the different embodiments of the application described below can be combined with each other as long as they do not conflict with each other.

[0044] Embodiment 1: The specific structure of the application is as follows:

[0045] Please refer to the attached Figures 1-2 The pressure testing device of the application comprises a base 1, and further comprises:

[0046] A lifting mechanism is fixed to the base 1 through a vertical support 4;

[0047] A lifting plate 3 horizontally arranged is connected to the driving shaft of the lifting mechanism and is driven by the lifting mechanism to perform lifting action, and the lifting plate 3 is provided with a contact type power transmission structure;

[0048] A pressure testing mechanism is installed on the lifting plate 3 and performs lifting action synchronously with the lifting plate 3, which comprises a support assembly fixed to the plate surface of the lifting plate 3, a stepping drive device installed on the support assembly, and a pressure sensing assembly drivingly connected with the stepping drive device, and the Z-axis pressure rod 14 of the pressure sensing assembly is suspended outside the lifting plate 3;

[0049] A jig 18 is detachably installed on the base 1 and has a groove surface for positioning a product to be tested, and the Z-axis pressure rod 14 can be pressed against the groove surface after being lowered.

[0050] A preferred technical solution of the embodiment: the power source of the lifting mechanism is a linear cylinder 8, the piston rod 5 of the linear cylinder 8 is drivingly connected to the lifting plate 3 downward, the plate surface of the lifting plate 3 has at least one guide hole, a guide rod 6 is arranged in each guide hole, the lower end of the guide rod 6 is fixed to the base 1, and the upper end is fixed to the side of the vertical support 4 through a connecting piece.

[0051] A preferred technical solution of the embodiment: the contact type power transmission structure is that two elastic needles 16 are installed on the lifting plate 3, the two elastic needles 16 are connected to an external power supply, and the lower end of the two elastic needles 16 can be connected to the test point contact of the product to be tested after being lowered.

[0052] A preferred technical solution of the embodiment: at least one limiting pressure rod 2 is installed at the lower end of the lifting plate 3.

[0053] A preferred technical scheme of the embodiment: the support assembly comprises a column 9 fixed on the plate surface of the lifting plate 3, a position switch 10 mounted on the column 9, and a step-by-step driving device mounting strip mounted on the column 9, and the step-by-step driving device is fixed on the step-by-step driving device mounting strip through a connecting block 13 and is height-adjustable.

[0054] A preferred technical scheme of the embodiment: the step-by-step driving device comprises:

[0055] A motor base is fixed on the front side of the support assembly, and a Z-axis guide rail and a Z-axis screw rod 15 are arranged on the motor base, and the Z-axis screw rod 15 is rotatable.

[0056] A step motor 11 is fixed on the top of the motor base, and the step motor 11 drives the Z-axis screw rod 15.

[0057] A sliding seat 12 is slidably connected to the Z-axis guide rail and is threadedly connected with the Z-axis screw rod 15.

[0058] A preferred technical scheme of the embodiment: the pressure sensing assembly comprises a pressure sensor mounted on the sliding seat 12 and a Z-axis pressing rod 14 mounted on the pressure sensor.

[0059] Embodiment 2:

[0060] As Figures 1-5 , a test method of the pressure test equipment, the test method comprises the following steps:

[0061] Step one, connect the motor base to the power supply and the gas source, and place the product to be tested into the groove surface of the jig 18;

[0062] Step two, turn on the power switch and the gas source, and the system is self-checked, and the system detects whether the piston rod 5 is at a preset height;

[0063] Step three, press the start switch, the linear cylinder 8 drives the piston rod 5 to descend, the piston rod synchronously drives the lifting plate 3 to descend, and then the lifting plate 3 synchronously drives the step-by-step driving device to descend;

[0064] When the lifting plate 3 reaches the preset position, the two elastic needles 16 thereon and the key test point contact of the product to be tested form a contact connection, so that the detection of the key pot piece resistance is realized;

[0065] Step four, synchronously, the step-by-step driving device is pressed down on the product to be tested by the weight of the movable part, and the Z-axis pressing rod 14 presses the key position of the product to be tested, and the weight of the movable part is less than the maximum stress value borne by the product to be tested, so that the key position of the product to be tested is prevented from being damaged.

[0066] During the pressing of the key of the product under test 17, the conductive resistor of the key switch inside the product under test is deformed by the pressing, which makes the circuit conductive and the circuit resistance decreases. During the time t during which the circuit resistance of the key switch changes, the pressure sensor will transmit the sensed force F to the MCU processor in real time and display the waveform of F / t and the resistance change curve of the key switch on the display screen.

[0067] Step 5: Stepper motor 11 starts, driving Z-axis lead screw 15 to rotate in steps, causing slide 12 to rise in steps. In turn, slide 12 drives Z-axis pressure rod 14 to rise. During the key self-recovery process, it will exert a certain pressure on Z-axis pressure rod 14, which will be sensed by pressure sensor. The force F sensed by pressure sensor is transmitted to MCU processor in real time, and the waveform of F / t and the resistance change curve of key dome are displayed on the screen.

[0068] By analyzing the outgoing peak a, outgoing valley b, return valley c, and return peak d in the F / t waveform, as well as the change curve of the on-resistance of the button dome, it can be determined whether the product under test is within the set range. If it exceeds the range, the product under test is deemed unqualified; if it is within the range, the product under test is deemed qualified.

[0069] Step six: Reset each component. When the slide is reset, the reset is completed by the slide contacting the stop switch.

[0070] Step 7: Remove the product to be tested.

[0071] like Figure 3 As shown, Figure 3 This is the F / t waveform diagram of the present invention. F represents the downward force detected by the pressure sensor, and t represents time. When the Z-axis pressure lever 14 just begins to contact the button of the product under test, the pressure sensor experiences zero force. The moving part on the stepper drive device presses down on the button, causing it to move downwards and deform under pressure. Simultaneously, during the pressing process, the button also generates a reaction force on the Z-axis pressure lever 14, which in turn provides pressure to the pressure sensor. The pressure sensor generates a pressure signal in real time. When the button reaches its lowest point, the pressure sensor experiences the maximum force. Figure 3 Point a in the key is the typical peak point PK of the outbound journey.

[0072] The stepper motor continues to move downwards at a constant speed, driving the Z-axis lead screw 15 to rotate. When the button is just pressed, the pressure on the pressure inductor is at its minimum. Point b in the figure is also a typical peak point BT in the button's forward stroke.

[0073] The stepping motor continues to move downward at a constant speed, and the pressure on the pressure sensor increases, and when the preset force m is reached, the downward movement stops.

[0074] The stepping motor 11 is started, the stepping motor 11 drives the Z-axis screw 15 to rotate, the slide 12 is lifted, the slide 12 drives the Z-axis pressing rod 14 to lift, when lifting a certain distance (not leaving the product key to be tested), the key is just popped up, at this time, the pressure received by the pressure sensor is the smallest, as shown in the C point in the figure, which is also the typical return valley point iMax in the key.

[0075] The stepping motor continues to move upward at a constant speed, and slowly leaves the product key to be tested, and in this process, a large force peak value will appear, as shown in the d point in the figure, which is also the typical return peak point rPK in the key.

[0076] According to the number of steps of the stepping motor, the displacement-pressure curve of the key can also be obtained.

[0077] When the pressure is tested, the on-resistance of the key piece in the product 17 is calculated by ADC at the same time, and the on-resistance value is obtained in real time, as shown in the figure. Figure 5 Figure 5 The figure is the R / t waveform diagram of the application. Figure 4 In the figure, R represents the on-resistance of the key piece, and t represents time.

[0078] When the Z-axis pressing rod 14 is pressed and has not reached the bottom, the on-resistance of the key piece does not change, and the resistance value does not change, as shown in the left straight line in the figure, which indicates that the resistance value does not change. Figure 5 When the Z-axis pressing rod 14 is pressed and reaches the bottom, the on-resistance of the key piece changes under force, and the resistance value decreases, as shown in the lower straight line segment in the figure. When the Z-axis pressing rod 14 rises, the on-resistance of the key piece returns to the original state, as shown in the right straight line segment in the figure, which indicates that the resistance value returns to the original value. Figure 5 Figure 5

[0079] Example 3:

[0080] The pressure test equipment of the application can be used as a pressure automatic calibration equipment and an automatic test equipment of the pressure touchpad, in addition, the pressure test equipment of the application is reformed again, that is, it can be used as a general pressure test equipment, and is applied to other related pressure test equipment.

[0081] ​​​In summary, the present application is provided with a needle on the lifting plate, so that the external power supply can stably supply the product to be tested. The present application uses the weight of the moving part of the stepping drive device to press the key position of the product to be tested, so that the key pot piece resistance at the key position is deformed to change the resistance value. Then the stepping motor drives the screw to rotate, so that the Z-axis pressure rod steps up, and then the key pot piece resistance at the key position returns to the original resistance value. In the process of deforming and restoring the key pot piece resistance, the pressure sensor tests the pressure change in real time, the MCU processor detects the resistance value of the key pot piece resistance in real time, and then forms a waveform graph on the display screen. The values generated on the waveform graph are compared with the preset resistance interval value and the force interval value. If the values generated on the waveform graph exceed the preset resistance interval value and the force interval value, the product to be tested is unqualified. If the values generated on the waveform graph are within the preset resistance interval value and the force interval value, the product to be tested is qualified. The pressure testing equipment of the present application has high testing efficiency and high testing accuracy.

[0082] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent flow transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A test method of a pressure testing apparatus, the test method being applied to a pressure testing apparatus comprising a base (1), characterized in that, Also includes: The lifting mechanism is fixed to the base (1) by a vertical bracket (4); A horizontally positioned lifting plate (3) is connected to the drive shaft of the lifting mechanism and is driven by the lifting mechanism to perform lifting actions. The lifting plate (3) is provided with a contact-type power transmission structure. The pressure testing mechanism installed on the lifting plate (3) moves up and down synchronously with the lifting plate (3). It includes a support assembly fixed to the surface of the lifting plate (3), a stepper drive device installed on the support assembly, and a pressure sensing component driven and connected to the stepper drive device. The Z-axis pressure rod (14) of the pressure sensing component is suspended outside the lifting plate (3). The fixture (18) is detachably mounted on the base (1) and has a groove surface for positioning the product to be tested. The Z-axis pressure bar (14) can press against the groove surface after it descends. The testing method includes the following steps: Step 1: Connect the base to the power supply and air supply, and place the product to be tested into the groove of the fixture (18); Step 2: Turn on the power switch and turn on the air supply. The system performs a self-test and checks whether the piston rod (5) is at the preset height. Step 3: Press the start switch. The linear cylinder (8) drives the piston rod (5) to descend. The piston rod synchronously drives the lifting plate (3) to descend, and then the lifting plate (3) synchronously drives the stepping drive device to descend. After the lifting plate (3) reaches the preset position, the two spring pins (16) on it and the button test point contact on the product under test form a contact connection to realize the detection of the conduction resistance of the button dome. Step four, synchronously, the stepper drive device presses down on the product to be tested by the weight of its movable part, so that the Z-axis pressure rod (14) presses down the key of the product to be tested; During the pressing process of the key of the product under test (17), the conductive resistor of the key switch inside the product under test is deformed by the pressing, which makes the circuit conductive and the circuit resistance decreases. During the time t during which the circuit resistance of the key switch changes, the pressure sensor will transmit the sensed force F to the MCU processor in real time and display the waveform of F / t and the resistance change curve of the key switch on the display screen. Step 5, the stepper motor (11) starts, and the stepper motor (11) drives the Z-axis screw (15) to rotate stepwise, so that the slide (12) is lifted stepwise, and then the slide (12) drives the Z-axis pressure rod (14) to lift upward. During the key self-recovery process, it will generate a certain pressure on the Z-axis pressure rod (14), which will be sensed by the pressure sensor. The force F sensed by the pressure sensor is transmitted to the MCU processor in real time, and the waveform of F / t and the resistance change curve of the button dome are displayed on the screen. By analyzing the outgoing peak a, outgoing valley b, return valley c, and return peak d in the F / t waveform, as well as the change curve of the on-resistance of the button dome, it can be determined whether the product under test is within the set range. If it exceeds the range, the product under test is deemed unqualified; if it is within the range, the product under test is deemed qualified. Step six: Reset each component. When the slide is reset, the reset is completed by the slide contacting the stop switch. Step 7: Remove the product to be tested.

2. The testing method for a pressure testing device according to claim 1, characterized in that, The power source of the lifting mechanism is a linear cylinder (8). The piston rod (5) of the linear cylinder (8) is driven to the lifting plate (3) with its downward direction. The lifting plate (3) has at least one guide hole on its surface. A guide rod (6) is inserted through each guide hole. The lower end of the guide rod (6) is fixed to the base (1), and its upper end is fixed to the side of the vertical support (4) through a connector.

3. The testing method for a pressure testing device according to claim 1, characterized in that, The contact power transmission structure has two spring pins (16) installed on the lifting plate (3). The two spring pins (16) are connected to the external power supply unit. After their lower ends descend, they can contact the test point contacts on the product under test.

4. The testing method for a pressure testing device according to claim 1, characterized in that, At least one limiting pressure bar (2) is installed at the lower end of the lifting plate (3).

5. The testing method for a pressure testing device according to claim 1, characterized in that, The bracket assembly includes a column (9) fixed to the surface of the lifting plate (3), a position switch (10) mounted on the column (9), and a stepper drive device mounting strip mounted on the column (9). The stepper drive device is fixed to the stepper drive device mounting strip by a connecting block (13) and its height is adjustable.

6. The testing method for a pressure testing device according to claim 1, characterized in that, The stepper drive device includes: The motor base is fixed to the front side of the bracket assembly, and is provided with a Z-axis guide rail and a Z-axis lead screw (15), which is rotatable; Stepper motor (11), a stepper motor (11) fixed to the top of the motor base and the stepper motor (11) driving the Z-axis lead screw (15). The slide (12) is slidably connected to the Z-axis guide rail and threadedly connected to the Z-axis lead screw (15).

7. The testing method for a pressure testing device according to claim 6, characterized in that, The pressure sensing assembly includes a pressure sensor mounted on the slide (12) and a Z-axis pressure bar (14) mounted on the pressure sensor.

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