Circuit board test fixture

Abstract

The embodiment of the utility model provides a circuit board test fixture. The circuit board test fixture comprises a test seat, a cover body, a cylinder, an electric connection module, a control switch module, a first fool-proof detection assembly and a second fool-proof detection assembly. A containing groove is formed in the upper surface of the testing seat and used for containing a circuit board to be tested. The first fool-proof detection assembly and the second fool-proof detection assembly are respectively arranged on the test seat, the first fool-proof detection assembly and the second fool-proof detection assembly are respectively used for detecting whether obstacles exist at a first height of a first position of the test seat and a second height of a second position of the test seat, and the first height is different from the second height. The cover body is arranged above the test seat and corresponds to the accommodating groove, and the cylinder is used for driving the cover body to lift. The electric connection module is arranged in the cover body and / or the test seat. The control switch module is electrically coupled to the air cylinder, the first fool-proof detection assembly and the second fool-proof detection assembly, and after it is confirmed that no obstacle exists, the control switch module is closed to allow the air cylinder to execute downward pressing operation.

Description

TECHNICAL FIELD

[0001] The utility model relates to test fixture technical field, especially a circuit board test fixture with protection function. BACKGROUND

[0002] When the circuit board is tested, the operator usually needs to place the circuit board into the accommodating groove of the test fixture, and then operates the downward detection mechanism above the accommodating groove to move downward to test the circuit board. If the operator is careless, the circuit board may be in an inclined state relative to the bottom wall of the accommodating groove, and the downward detection mechanism is operated to move downward. At this time, the downward detection mechanism will crush the circuit board.

[0003] Therefore, how to design the test fixture of the circuit board to automatically detect whether the circuit board is placed flat to provide protection for the circuit board has become a new research topic. SUMMARY

[0004] The embodiment of the utility model provides a circuit board test fixture, which can automatically detect whether the circuit board is placed flat to provide protection for the circuit board.

[0005] The embodiment of the utility model provides a circuit board test fixture, which comprises:

[0006] A test seat, the upper surface of the test seat is provided with an accommodating groove, and the accommodating groove is used for accommodating the circuit board to be tested;

[0007] A first foolproof detection component and a second foolproof detection component are arranged on the test seat, the first foolproof detection component is used for detecting whether there is an obstacle at the first height of the first position of the test seat, and the second foolproof detection component is used for detecting whether there is an obstacle at the second height of the second position of the test seat, wherein the second height is different from the first height;

[0008] A cover is arranged above the test seat and corresponds to the accommodating groove;

[0009] A gas cylinder is used for driving the cover to lift and lower;

[0010] An electrical connection module is arranged in the cover and / or the test seat; and

[0011] A control switch module is electrically coupled to the gas cylinder, the first foolproof detection component and the second foolproof detection component. After the first foolproof detection component and the second foolproof detection component confirm that there is no obstacle, the control switch module is closed to allow the gas cylinder to perform the downward operation.

[0012] Preferably, the first detection positioning block and the second detection positioning block are arranged on opposite sides of the accommodating groove.

[0013] The first fool-proof detection assembly comprises a first infrared emitter and a first infrared receiver arranged oppositely, and the first infrared emitter and the first infrared receiver are arranged in the first detection positioning block and the second detection positioning block respectively.

[0014] Further preferably, the second fool-proof detection assembly comprises a second infrared emitter and a second infrared receiver arranged oppositely.

[0015] The circuit board testing fixture further comprises a third detection positioning block and a fourth detection positioning block arranged oppositely on two opposite sides of the accommodating groove, and the second infrared emitter and the second infrared receiver are arranged in the third detection positioning block and the fourth detection positioning block respectively; or the second infrared emitter and the second infrared receiver are arranged in the first detection positioning block and the second detection positioning block respectively.

[0016] Further preferably, the light path of the first infrared emitter is parallel to the light path of the second infrared emitter.

[0017] Further preferably, the upper surface of the test seat is further provided with an infrared groove, and the infrared groove is located between the first infrared emitter and the first infrared receiver.

[0018] The height of the first position relative to the bottom wall of the accommodating groove is less than the depth of the accommodating groove, and the infrared groove is in communication with the accommodating groove.

[0019] Preferably, the control switch module is further electrically coupled to a first operation button and a second operation button; when the first operation button and the second operation button are operated simultaneously, the cylinder is driven to perform the pressing operation.

[0020] Further preferably, the control switch module comprises a first control switch, a second control switch and a third control switch.

[0021] The first control switch is electrically coupled to the first fool-proof detection assembly, the second control switch is electrically coupled to the second fool-proof detection assembly, the first control switch is closed when the first fool-proof detection assembly confirms no obstacle, and the second control switch is closed when the second fool-proof detection assembly confirms no obstacle.

[0022] When the first operation button and the second operation button are operated simultaneously, and the first control switch and the second control switch are closed, the third control switch is closed.

[0023] The third control switch is electrically coupled to the cylinder, and the cylinder is driven to perform the pressing operation when the third control switch is closed.

[0024] Further preferably, a delay switch is further included and electrically coupled between the third control switch and the cylinder; the first operation button and the second operation button are simultaneously operated, and the third control switch is closed when the first control switch and the second control switch are closed, so that the delay switch is closed and starts timing; the delay switch is turned off when the delay switch times to a first time.

[0025] Alternatively, a delay switch is further included and electrically coupled to the third control switch; the first operation button and the second operation button are simultaneously operated, and the delay switch is turned on and starts timing when the first control switch and the second control switch are closed, and the third control switch is closed; the delay switch is turned off to turn off the third control switch when the delay switch times to a first time.

[0026] Preferably, the shape of the accommodating groove corresponds to the shape of the circuit board to be tested.

[0027] Further preferably, the edge of the accommodating groove has at least one notch for taking the circuit board to be tested.

[0028] Compared with the prior art, the embodiment of the utility model provides a kind of circuit board test fixture, including test seat, cover, cylinder, electric connection module, control switch module, first foolproof detection component and second foolproof detection component.The upper surface of the test seat is equipped with accommodating groove, and the accommodating groove is used to accommodate the circuit board to be tested.The first foolproof detection component and the second foolproof detection component are respectively arranged in the test seat, the first foolproof detection component is used to detect whether the first height of the first position of the test seat exists obstacle, the second foolproof detection component is used to detect whether the second height of the second position of the test seat exists obstacle, and the first height and the second height are different.The cover is set above the test seat and corresponds to the accommodating groove, and the cylinder is used to drive the cover to lift.The electric connection module is set in the cover and / or the test seat.The control switch module is electrically coupled to the cylinder, the first foolproof detection component and the second foolproof detection component, and after the first foolproof detection component and the second foolproof detection component confirm no obstacle, the control switch module is closed to allow the cylinder to perform down operation. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is the three-dimensional structure schematic diagram of circuit board test fixture in an embodiment of the utility model;

[0030] Figure 2 It is Figure 1 It is the enlarged view of A in the middle;

[0031] Figure 3 It is the overhead structure schematic diagram of test seat of circuit board test fixture in an embodiment of the utility model;

[0032] Figure 4 A structural block diagram of the electric device in the circuit board test fixture in one embodiment of the present application;

[0033] Figure 5 A conceptual relationship diagram of the electric device in the circuit board test fixture in one embodiment of the present application;

[0034] Figure 6 A structural block diagram of the electric device in the circuit board test fixture in another embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to have a further understanding of the object, structure, features and functions of the present application, the embodiments are described in detail as follows.

[0036] Some words are used in the description and claims to refer to certain elements. Those skilled in the art can understand that the same element can be referred to by different names by manufacturers. The description and claims of the present application do not distinguish elements by name differences, but by functional differences. Throughout the description and claims, the word "comprising" is an open word, so it should be interpreted as "including but not limited to".

[0037] Please refer to Figures 1 to 3 , a structural diagram of the circuit board test fixture 1 in one embodiment of the present application, wherein, Figure 1 and Figure 2 The overall and partial of the circuit board test fixture 1 under stereoscopic perspective are shown, Figure 3 The test seat 10 of the circuit board test fixture 1 under the perspective of top view is shown. The circuit board test fixture 1 includes the test seat 10, the air cylinder 121, the cover 122, the electric connection module (not shown in the figure), the control switch module SW, the first foolproof detection assembly 13 and the second foolproof detection assembly 14. The upper surface 10s of the test seat 10 is provided with a receiving groove 10c, which is used to accommodate the circuit board 2 (Printed Circuit Board Assembly, PCBA) to be tested. It should be noted that the directions involved in this paper are based on the perspective of top view. Figure 1The placement direction of the circuit board test fixture 1 of the example, such as the upper direction corresponding to the y direction, is not particularly limited by the utility model. The first fool-proof detection assembly 13 and the second fool-proof detection assembly 14 are respectively arranged on the test seat 10. The first fool-proof detection assembly 13 is used for detecting whether an obstacle exists at a first height of a first position of the test seat 10. The second fool-proof detection assembly 14 is used for detecting whether an obstacle exists at a second height of a second position of the test seat 10. The first height and the second height are different. In some preferred embodiments, the first position and the second position can respectively correspond to opposite ends of the circuit board under test 2. In other preferred embodiments, the first position and the second position can also correspond to two relatively thick positions on the circuit board under test 2, such as positions where electronic components such as connectors are soldered. That is, the first position and the second position are positions in the xz plane relative to the circuit board under test 2, and the specific positions are determined according to actual conditions, and the utility model is not limited in this regard. The cover body 122 is arranged above the test seat 10 and corresponds to the accommodating groove 10c. The air cylinder 121 is used to drive the cover body 122 to ascend and descend. The electrical connection module is arranged in the cover body 122 and / or the test seat 10, so as to be electrically coupled with the circuit board under test 2 and perform a function test when the cover body 122 is pressed down by the air cylinder 121. The control switch module SW is electrically coupled with the air cylinder 121, the first fool-proof detection assembly 13, and the second fool-proof detection assembly 14. After the first fool-proof detection assembly 13 and the second fool-proof detection assembly 14 confirm that there is no obstacle, the control switch module SW is closed to allow the air cylinder 121 to perform the pressing operation.

[0038] It should be noted that the first foolproof detection assembly 13 and the second foolproof detection assembly 14 may, for example, be a Lidar scanner, a laser sensor, or a fiber sensor, etc., for detecting the area slightly above (y direction) the circuit board under test 2. When the circuit board under test 2 is placed askew relative to the accommodation groove 10c, the circuit board under test 2 will be in an inclined state relative to the bottom wall of the accommodation groove 10c due to not being completely placed into the accommodation groove 10c. At least one of the first foolproof detection assembly 13 and the second foolproof detection assembly 14 can detect that the above area is partially blocked by the circuit board under test 2, that is, the first foolproof detection assembly 13 and / or the second foolproof detection assembly 14 detect an obstacle, so that the operator can adjust the pose of the circuit board under test 2. When neither the first foolproof detection assembly 13 nor the second foolproof detection assembly 14 detects that the first position and the second position are blocked by an object, the circuit board under test 2 is just placed flat on the bottom wall of the accommodation groove 10c. Preferably, when it is confirmed that the circuit board under test 2 is placed flat, the first foolproof detection assembly 13 and the second foolproof detection assembly 14 can also provide a reminder signal, for example, a "drop" prompt sound, to inform the operator to perform the next detection step. However, the actual application is not limited thereto. In this way, it can be avoided that the operator operates the pressing detection mechanism 12 to press down under the condition that the circuit board under test 2 is not placed flat, thereby causing damage to the circuit board under test 2. As shown in Figure 2 the first height of the first position and the board surface of the circuit board under test 2 are separated by a first distance 13h in the vertical direction (y direction), and the second height of the second position and the board surface of the circuit board under test 2 are separated by a second distance 14h in the vertical direction (y direction). The first foolproof detection assembly 13 and the second foolproof detection assembly 14 arranged at different horizontal and height positions of the test seat 10 can detect a plurality of electronic elements such as integrated circuits (IC), metal contacts, connectors, etc. of different thicknesses on the circuit board under test 2, that is, the first foolproof detection assembly 13 and the second foolproof detection assembly 14 can adapt to the circuit board under test 2 with inconsistent overall thickness to make more accurate pose detection of the circuit board under test 2.

[0039] In a preferred embodiment, as shown in Figure 3 the shape of the accommodation groove 10c corresponds to the shape of the circuit board under test 2. Preferably, the edge of the accommodation groove 10c has at least one notch 10b for taking the circuit board under test 2. Preferably, the size of the notch 10b is smaller than the size of the corresponding edge of the accommodation groove 10c, in other words, a part of at least one edge of the accommodation groove 10c is formed with a notch 10b, which may, for example, further extend to the circumference of the test seat 10. The operator can more conveniently take the circuit board under test 2 through the notch 10b, and the other part of the edge can still limit the circuit board under test 2.

[0040] In a preferred embodiment, as shown in Figures 2 to 3 The first fool-proof detection assembly 13 includes a first infrared emitter tube 131 and a first infrared receiver tube 132 arranged oppositely, and the first infrared receiver tube 132 is used to receive the infrared rays emitted by the first infrared emitter tube 131. When the circuit board 2 to be tested is placed into the receiving groove 10c, the uninterfered infrared rays received by the first infrared receiver tube 132 can confirm that the circuit board 2 to be tested at the first position has been placed flatly in the receiving groove 10c. The circuit board testing fixture 1 further includes a first detection positioning block 101 and a second detection positioning block 102 arranged oppositely at two opposite sides of the receiving groove 10c. In this embodiment, the first detection positioning block 101 and the second detection positioning block 102 are locked to the upper surface 10s of the testing seat 10 by screws, and the upper surface 10s of the testing seat 10 can also be provided with a detection positioning groove (not shown in the figure) to position the first detection positioning block 101 and the second detection positioning block 102 which can be detached. In other embodiments, the first detection positioning block 101 and the second detection positioning block 102 can also be integrally formed with the testing seat 10, but the actual application is not limited thereto. The first infrared emitter tube 131 is arranged on the first detection positioning block 101, and the first infrared receiver tube 132 is arranged on the second detection positioning block 102, so that the first infrared emitter tube 131 is fixed in position relative to the first infrared receiver tube 132. Preferably, the second fool-proof detection assembly 14 includes a second infrared emitter tube 141 and a second infrared receiver tube 142 arranged oppositely, and the second infrared receiver tube 142 is used to receive the infrared rays emitted by the second infrared emitter tube 141, which detects the circuit board 2 to be tested in a similar manner to the first fool-proof detection assembly 13 and will not be described again. That is, when the uninterfered infrared rays pass through the first height at the first position and the second height at the second position, it means that the circuit board 2 to be tested has been placed flatly in the receiving groove 10c.

[0041] In some preferred embodiments, as shown in Figures 2 to 3As shown, the second infrared emitting tube 141 and the second infrared receiving tube 142 are arranged on the first detection positioning block 101 and the second detection positioning block 102 respectively, that is, the first infrared emitting tube 131 and the second infrared emitting tube 141 are arranged on the first detection positioning block 101, and the first infrared receiving tube 132 and the second infrared receiving tube 142 are arranged on the second detection positioning block 102. In this embodiment, the light path of the first infrared emitting tube 131 is parallel to the light path of the second infrared emitting tube 141. In other preferred embodiments, the circuit board testing fixture 1 further comprises a third detection positioning block and a fourth detection positioning block (not shown in the figure), which are also arranged on opposite sides of the receiving groove 10c, the second infrared emitting tube 141 is arranged on the third detection positioning block, and the second infrared receiving tube 142 is arranged on the fourth detection positioning block. In this embodiment, the light path of the first infrared emitting tube 131 can be parallel to the light path of the second infrared emitting tube 141, that is, the third detection positioning block and the fourth detection positioning block are arranged parallel to the first detection positioning block 101 and the second detection positioning block 102; or, the light path of the first infrared emitting tube 131 can be perpendicular or inclined to the light path of the second infrared emitting tube 141, that is, the third detection positioning block and the fourth detection positioning block can be arranged on the other opposite sides of the receiving groove 10c to be perpendicular to the first detection positioning block 101 and the second detection positioning block 102, or the third detection positioning block and the fourth detection positioning block can be arranged inclined to the first detection positioning block 101 and the second detection positioning block 102; the utility model is not limited thereto.

[0042] In a preferred embodiment, the upper surface 10s of the test seat 10 is also provided with an infrared groove 11, which is located between the first infrared emitting tube 131 and the first infrared receiving tube 132. As shown in the figure, Figure 1 As shown in the figure, Figure 2 The first position is lower than the second position, that is, the first height is higher than the second height. Preferably, the infrared groove 11 can penetrate through the opposite sides of the receiving groove 10c, that is, as shown in the figure, Figure 2As shown, the left and right sides of the accommodating groove 10c are respectively formed with a first infrared groove 11a and a second infrared groove 11b. In this embodiment, the first infrared groove 11a is located between the first infrared emitting tube 131 and the accommodating groove 10c, and the second infrared groove 11b is located between the first infrared receiving tube 132 and the accommodating groove 10c.

[0043] In a preferred embodiment, the circuit board testing jig 1 further comprises a first operation button b1 and a second operation button b2. In this preferred embodiment, as shown in Figure 1 As shown, the first operation button b1, the second operation button b2 and the testing seat 10 are respectively arranged on the base of the circuit board testing jig 1. The first operation button b1 and the second operation button b2 are respectively electrically coupled to the control switch module SW. When the first operation button b1 and the second operation button b2 are simultaneously operated and the first fool-proof detection assembly 13 and the second fool-proof detection assembly 14 respectively confirm that there is no obstacle, the control switch module SW is closed to drive the air cylinder 121 to perform the pressing operation. That is, in this preferred embodiment, the first fool-proof detection assembly 13 and the second fool-proof detection assembly 14 respectively confirm that there is no obstacle as one condition for allowing the air cylinder 121 to press, and the simultaneous operation of the first operation button b1 and the second operation button b2 is another condition for allowing the air cylinder 121 to press. Only when the above two conditions are met at the same time, the control switch module SW can be closed to power on to drive the air cylinder 121 to perform the pressing operation. In this way, the circuit board 2 to be tested can be provided with double protection, and the design of the two operation buttons b1 / b2 can also prevent the operator from being mistaken.

[0044] In a preferred embodiment, the structural block diagram of the electric devices in the circuit board testing jig 1 is as shown in Figure 4 It should be noted that the structural block diagram is only used to represent the cooperation relationship between the electric devices, and the actual circuit arrangement can be operated by the technician according to the actual situation, and the utility model is not limited thereto. The control switch module SW comprises a first control switch SW1, a second control switch SW2 and a third control switch SW3. For the convenience of understanding, this embodiment takes an example that each control switch is composed of a solenoid valve and a relay to realize the control function of the air cylinder 121. It should be noted that the relay is attracted after being powered on and can drive the corresponding solenoid valve to close. That is, when the relay is turned on, the relay is attracted and drives the solenoid valve to close, so that the electric device controlled by the solenoid valve is powered on. Correspondingly, when the relay is powered off, the solenoid valve also loses the driving force and is disconnected, and the electric device controlled by the solenoid valve is powered off. In this way, the relay can be used to drive the solenoid valve to close or disconnect, and the solenoid valve is used to control the power on or off of the corresponding electric device (such as the air cylinder 121). However, the control switch can also be composed of other similar electronic elements, and the utility model is not limited thereto.

[0045] Specifically, such as Figure 5 As shown (without delay switch 15 in this embodiment), the relay of the first control switch SW1 is electrically coupled to the first foolproof detection component 13, and the relay of the second control switch SW2 is electrically coupled to the second foolproof detection component. After the first operation button b1 and the second operation button b2 are operated simultaneously, when the first foolproof detection component 13 confirms that there is no obstacle, the relay of the first control switch SW1 is energized and engaged, thereby driving the solenoid valve of the first control switch SW1 to close; when the second foolproof detection component 14 confirms that there is no obstacle, the relay of the second control switch SW2 is energized and engaged, thereby driving the solenoid valve of the second control switch SW2 to close. It should be noted that the first foolproof detection component 13 and the second foolproof detection component 14 can share the same power supply with the first control switch SW1 and the second control switch SW2. That is, when the power supply is turned on, the first foolproof detection component 13, the second foolproof detection component 14, the first control switch SW1, and the second control switch SW2 all enter a standby or working state. Alternatively, the first foolproof detection component 13 and the second foolproof detection component 14 can be driven by a separate power supply. That is, the first foolproof detection component 13 and the second foolproof detection component 14 can be energized independently and are in a state where they can detect obstacles at any time. However, the actual application is not limited to this. The relay of the third control switch SW3 is coupled to the solenoid valves of the first control switch SW1 and the second control switch SW2. When the solenoid valves of the first control switch SW1 and the second control switch SW2 are driven to close respectively, the relay of the third control switch SW3 is energized and drives the solenoid valve of the third control switch SW3 to close. The solenoid valve of the third control switch SW3 is electrically coupled to the cylinder 121. By closing the relay of the third control switch SW3, the cylinder 121 is energized and driven to perform the pressing operation.

[0046] In other preferred embodiments, such as Figure 6 The diagram shows the structural block diagram of the electrical components within the circuit board test fixture 1. The circuit board test fixture 1 also includes a time delay switch 15, which is electrically coupled to the third control switch SW3. This embodiment is illustrated by assuming each control switch consists of a relay and a solenoid valve. The time delay switch 15 can, for example, be composed of a time counter, a relay, and a solenoid valve; those skilled in the art can design it according to actual conditions, which will not be elaborated further. Unlike the previous embodiment, as... Figure 5 and Figure 6As shown, the delay switch 15 is electrically coupled between the electromagnetic valves of the first control switch SW1 and the second control switch SW2 and the relay of the third control switch SW3. That is, the delay switch 15 serves as a transition switch between the first control switch SW1 and the second control switch SW2 and the third control switch SW3. Specifically, after the electromagnetic valves of the first control switch SW1 and the second control switch SW2 are both closed, the delay switch 15 is turned on and starts timing, and the relay of the third control switch SW3 is energized and attracted to drive the electromagnetic valve of the third control switch SW3 to close. When the count value of the delay switch 15 reaches a first time (for example, set as a test time, about 3-4s), the delay switch 15 is reset and controls the relay of the third control switch SW3 to be de-energized, and the electromagnetic valve of the third control switch SW3 loses driving force and is opened, thereby causing the air cylinder 121 to be de-energized and to rise. In some embodiments, the delay switch 15 can also be electrically coupled between the electromagnetic valve of the third control switch SW3 and the air cylinder 121 (not shown in the figure), and after the electromagnetic valve of the third control switch SW3 is closed, the delay switch 15 is closed and starts timing. When the delay switch 15 times to the first time, the delay switch 15 is opened, and the utility model is not limited thereto.

[0047] In a preferred embodiment, as shown in Figure 1 、 Figures 4 to 6 As shown, the circuit board test fixture 1 further includes an emergency stop button S, which is connected in series in the power circuit of the circuit board test fixture 1 and is in a normally closed state. When an emergency occurs, the circuit board test fixture 1 can be completely disconnected by pressing the emergency stop button S.

[0048] In summary, the embodiment of the utility model provides a kind of circuit board test fixture, including test seat, cover, cylinder, electrical connection module, control switch module, first fool-proof detection component and second fool-proof detection component.The upper surface of the test seat is provided with accommodating groove, and the accommodating groove is used to accommodate the circuit board to be measured.The first fool-proof detection component and the second fool-proof detection component are respectively arranged in the test seat, the first fool-proof detection component is used to detect whether there is obstacle at the first height of the first position of the test seat, the second fool-proof detection component is used to detect whether there is obstacle at the second height of the second position of the test seat, and the first height and the second height are different.The cover is arranged above the test seat and corresponds to the accommodating groove, and the cylinder is used to drive the cover to rise and fall.The electrical connection module is arranged in the cover and / or the test seat.The control switch module is electrically coupled to the cylinder, the first fool-proof detection component and the second fool-proof detection component, and after the first fool-proof detection component and the second fool-proof detection component confirm that there is no obstacle, the control switch module is closed to allow the cylinder to perform the operation of pressing down.

[0049] The utility model has been described by the above related embodiments, however the above embodiment is only the example of implementing the utility model. It must be pointed out that the disclosed embodiment does not limit the scope of the utility model. On the contrary, the change and the decoration made without departing from the spirit and scope of the utility model all belong to the patent protection scope of the utility model.

Claims

1. A circuit board test fixture, comprising: The circuit board test fixture comprises: a test seat, an upper surface of the test seat being provided with a receiving groove for accommodating a circuit board to be tested; a first fool-proof detection assembly and a second fool-proof detection assembly, the first fool-proof detection assembly being arranged on the test seat and being used for detecting whether an obstacle exists at a first height of a first position of the test seat, the second fool-proof detection assembly being arranged on the test seat and being used for detecting whether an obstacle exists at a second height of a second position of the test seat, wherein the second height is different from the first height; a cover arranged above the test seat and corresponding to the receiving groove; an air cylinder for driving the cover to move up and down; an electrical connection module arranged in the cover and / or the test seat; and a control switch module electrically coupled to the air cylinder, the first fool-proof detection assembly and the second fool-proof detection assembly, the control switch module being closed to allow the air cylinder to perform a pressing operation after the first fool-proof detection assembly and the second fool-proof detection assembly confirm that no obstacle exists.

2. The circuit board test fixture of claim 1, wherein, The circuit board test fixture further comprises a first detection positioning block and a second detection positioning block arranged on opposite sides of the receiving groove. The first fool-proof detection assembly comprises a first infrared emitter and a first infrared receiver arranged oppositely, the first infrared emitter and the first infrared receiver being arranged on the first detection positioning block and the second detection positioning block respectively.

3. The circuit board test fixture of claim 2, wherein, The second fool-proof detection assembly comprises a second infrared emitter and a second infrared receiver arranged oppositely. The circuit board test fixture further comprises a third detection positioning block and a fourth detection positioning block arranged on opposite sides of the receiving groove, the second infrared emitter and the second infrared receiver being arranged on the third detection positioning block and the fourth detection positioning block respectively; or the second infrared emitter and the second infrared receiver being arranged on the first detection positioning block and the second detection positioning block respectively.

4. The circuit board test fixture of claim 3, wherein The light path of the first infrared emitter is parallel to the light path of the second infrared emitter.

5. The circuit board test fixture of claim 2, wherein, The upper surface of the test seat is further provided with an infrared groove between the first infrared emitter and the first infrared receiver. The height of the first position relative to the bottom wall of the receiving groove is less than the depth of the receiving groove, and the infrared groove is in communication with the receiving groove.

6. The circuit board test fixture of claim 1, wherein The circuit board test fixture further comprises a first operation button and a second operation button electrically coupled to the control switch module; wherein the first operation button and the second operation button are operated simultaneously, and the air cylinder is driven to perform a pressing operation when the control switch module is closed. The control switch module comprises a first control switch, a second control switch and a third control switch. The first control switch is electrically coupled to the first fool-proof detection assembly, the second control switch is electrically coupled to the second fool-proof detection assembly, the first control switch is closed when the first fool-proof detection assembly confirms that no obstacle exists, and the second control switch is closed when the second fool-proof detection assembly confirms that no obstacle exists. The first operation button and the second operation button are operated simultaneously, and the third control switch is closed when the first control switch and the second control switch are closed. The third control switch is electrically coupled to the air cylinder, and the air cylinder is driven to perform a pressing operation when the third control switch is closed. ​ 8. The circuit board testing fixture of claim 7, wherein: a delay switch is further electrically coupled between the third control switch and the cylinder; the first operation button and the second operation button are simultaneously operated, and the third control switch is closed when the first control switch and the second control switch are closed, so that the delay switch is closed and starts timing; the delay switch is turned off when the delay switch is timed to a first time; or, a delay switch is further electrically coupled to the third control switch; the first operation button and the second operation button are simultaneously operated, and the delay switch is turned on and starts timing when the first control switch and the second control switch are closed, and the third control switch is closed; the delay switch is turned off when the delay switch is timed to a first time, so that the third control switch is turned off.

9. The circuit board test fixture of claim 1, wherein, The shape of the accommodating groove corresponds to the shape of the circuit board to be tested.

10. The circuit board test fixture of claim 9, wherein, The edge of the accommodating groove has at least one notch for taking the circuit board to be tested.

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