Rapid inspection device for fuse trigger switch

Abstract

The utility model relates to a rapid inspection device for a fuse trigger switch. The detection device comprises a base, a support, a rolling bearing, a detection bedplate, a compression spring, a cover plate clamping ring, a cover plate, a long screw rod, a support, a clamping ring, a detected switch, a locking mechanism and a signal feedback circuit, wherein the support is fixedly connected with the base; a rolling bearing is arranged at the other end of the support, the rolling bearing and the matching surface of the detection table plate are fixed together through interference fit, and a long screw rod is matched with a nut to sequentially fix a gasket, a cover plate, a clamping ring, a compression spring and the detection table plate; the cover plate, the cover plate clamping ring, the compression spring and the detection table plate are sequentially fixed by the long screw rod; a detected switch is fixed on the switch bracket; a locking mechanism is arranged on one side of the detected switch with the positioner; the signal feedback circuit is connected according to point positions required by a switch, and a light-emitting diode and a buzzer are used as signal feedback. According to the utility model, the effects of simplifying the manual detection difficulty and intensity and improving the efficiency and the detection precision are achieved.

Description

Technical Field

[0001] This utility model relates to the field of solid rocket engine safety self-destruction technology, specifically to a rapid testing device for a safety detonator switch. Background Technology

[0002] The safety detonator is used in the engine's self-destruct mechanism. When an anomaly occurs during missile flight, the control system sends an open signal to the safety detonator, activating the self-destruct mechanism and causing the missile to self-destruct. The safety detonator is subjected to extremely harsh mechanical environments during missile flight, so the safety detonator switch must maintain a stable signal under these conditions. As a state-transition signal switch, the signal indicates the working state (BK2 switch closed, BK1 switch open) when the positioner is in a free state, and the safety state (BK1 switch closed, BK2 switch open) when the positioner is in a compressed state. In actual flight environments, regardless of whether the switch is in the safety or working state, the positioner will be subjected to loads in any 360° direction. Under loads in any direction, the switch signal must remain stable.

[0003] During the quality re-inspection of the fuse detonator switch, it is necessary to simulate a 360° load on the positioner and check whether the switch signal remains stable. If the signal is abnormal in any direction, the switch must be rejected. Currently, the switch can only be inspected manually. Force is applied to the positioner with the thumb, followed by a 360° rotation to simulate the force on the positioner. A buzzer is connected to the bottom terminal of the switch. When the switch is functioning normally, the buzzer sounds continuously. When the switch malfunctions, the buzzer sound is intermittent.

[0004] The current manual testing method for fuse detonator switches has four main problems: First, it is inefficient and time-consuming. Second, it is labor-intensive, as a large force needs to be applied with the thumb to simulate the force applied to the switch, which can cause pain in the thumb over a long period of time. Therefore, a single person can only test no more than 20 switches per day, resulting in a long testing cycle and requiring a large number of manual testing personnel. Third, it is technically demanding and difficult to operate, as inexperienced inspectors cannot perform the tests. Fourth, it has a large testing error, as the testers cannot guarantee that a constant load is applied to the switch at 360°, leading to incomplete quality testing. Summary of the Invention

[0005] Based on the above-mentioned technical problems, this utility model proposes a rapid testing device for safety detonator switches. This device addresses the issues of low efficiency, complex operation, large errors, and inability to fully cover testing requirements that are often encountered in the quality inspection of safety detonator switches in solid rocket engine self-destruct devices, where manual testing is commonly used. This device achieves comprehensive functional testing of safety detonator switches, ensuring their quality. It can also be used for the quality inspection of other similar small-structure switches.

[0006] To address the aforementioned technical problems, one objective of this invention is to provide a rapid testing device for fuse detonator switches. This device comprises two parts: an automatic mechanical detection structure and a signal feedback circuit.

[0007] The automatic mechanical detection structure includes a base 1, a bracket 2, a rolling bearing 3, a nut 4, a detection platform 5, a compression spring 6, a cover plate retaining ring 7, a cover plate 8, a long screw 9, a bracket 10, a limit key 11, a washer 12, a retaining ring 13, the switch to be detected 14, a screw 15, and a switch locking mechanism 16.

[0008] One end of the bracket 2 is fixedly connected to the base 1; the other end of the bracket 2 is mechanically mounted with a rolling bearing 3, which is connected to the bracket 2 as a whole using adhesive on the mating surface; the mating surfaces of the rolling bearing 3 and the detection platform 5 are fixed together by interference fit to restrict its axial degree of freedom and ensure its stable support.

[0009] On one side of the upper surface of the test platform 5, a long screw 9 passes through the washer 12, cover plate 8, retaining ring 13, compression spring 6 and test platform 5 in sequence, and is fixed by nut 4 on the other side of the test platform 5; on the other side of the upper surface of the test platform 5, a long screw 9 passes through the cover plate 8, cover plate retaining ring 7, compression spring 6 and test platform 5 in sequence, and is fixed by nut 4 on the other side of the test platform 5.

[0010] The switch bracket 10 and the bracket 2 are fixed together by keying on their structure; the end of the switch 14 under test with the positioner is vertically mounted on the center hole of the switch bracket 10, and two limit keys 11 are installed in the corresponding keyways of the switch 14 under test and the switch bracket 10 to restrict the rotational freedom of the switch 14 under test; a locking mechanism 16 is provided on the side of the switch under test with the positioner, and the locking mechanism 16 is fixed to the upper surface of the test platform 5 by screws 15;

[0011] The signal feedback circuit consists of a power supply, wires, a buzzer, an LED, and a small alligator clip. The signal feedback circuit is connected according to the switch requirements, and the LED and buzzer serve as signal feedback.

[0012] Furthermore, the locking mechanism is a limiting device for the switch positioner, including a locking spring 17, a connector 18, an operating rod 19, a stop rod 20, and a gear position frame 21. One end of the locking spring 17 is sleeved on the switch positioner, and the other end is connected to the connector 18. The operating rod 19 is assembled into the cylindrical hole of the gear position frame 21, with the threaded end of the operating rod 19 pointing towards the center of the detection platform 5. The stop rod 20 is installed and tightened in the threaded hole of the operating rod 19, and the threaded end of the operating rod 19 is engaged with the connector 18 and tightened.

[0013] Furthermore, the connector includes a connector rotor 22 and a connector housing 23. The small end of the connector rotor 22 passes through the cylindrical hole of the connector housing 23 and points to the center of the test platform 5, which restricts the linear motion of the connector rotor, releases the rotational degree of freedom, ensures that it can rotate freely in the cylindrical hole of the connector housing 23, and prevents resistance from affecting the inspection process.

[0014] Furthermore, the cover plate 8 restricts the position of the switch positioner to ensure that the switch positioner is in the correct position. By adjusting the height of the cover plate, the detection of the safety state (BK1 switch) and the working state (BK2 switch) can be realized. The cover plate can be rotated to achieve the engagement and disengagement with the cover plate retaining ring 7.

[0015] Furthermore, the base 1 has a threaded hole in the center, which is fixed together with the threaded end of the bracket 2 by threaded connection.

[0016] Furthermore, the operating lever 19 is assembled into the cylindrical hole of the gear position bracket with clearance fit. An appropriate amount of lubricant is applied to the mating surface to ensure smooth relative movement between the two.

[0017] Furthermore, the signal feedback circuit consists of a power supply, a buzzer, an LED, and two small alligator clips connected in series. The two small alligator clips are connected according to the required positions of the switch 14 under test. The LED and the buzzer serve as signal feedback. When the switch 14 under test is in the closed position, the LED lights up and the buzzer sounds continuously. When the switch 14 is in the open position, the LED turns off and the buzzer does not sound, indicating that the switch is unqualified.

[0018] Based on the same concept, this utility model also provides a rapid testing method for fuse detonator switches, the specific steps of which are as follows:

[0019] S1: Place the rapid testing device on a work platform, place the end of the fuse detonator switch to be tested with the positioner vertically upward on the center hole of the switch bracket, and use two limit keys to install in the keyway of the switch and the switch bracket to ensure that the spatial position of the switch in the rapid testing device is fixed and that there is no relative movement between the switch and the switch bracket.

[0020] S2: Place the free end ring of the locking spring onto the positioner of the safety detonator switch, press the cover plate onto the top of the switch positioner, and rotate the cover plate to lock it onto the cover plate retaining ring. The cover plate achieves engagement and disengagement with the cover plate retaining ring by rotation.

[0021] S3: The detection of the safety status (BK1 switch) and working status (BK2 switch) can be achieved by adjusting the height of the cover plate. The relative rotation between the positioner and the switch housing is limited by applying radial tension to the switch positioner by the spring. The test of applying a constant load in 360° is completed by rotating the test platform.

[0022] S4: The two alligator clips of the signal feedback circuit are connected according to the required positions of the switch to be tested. The LED and buzzer are used as signal feedback. When the switch is in the closed state in the test position, the LED lights up and the buzzer sounds continuously; when the switch is in the open state in the test position, the LED turns off and the buzzer does not sound, indicating that the switch is unqualified.

[0023] The present invention provides a small, lightweight, and highly reliable rapid testing device for fuse detonator switches. Through an automated mechanical structure, it simulates a 360° load on the fuse detonator switch, improving efficiency and testing accuracy, reducing costs, achieving comprehensive functional testing of the fuse detonator switch, and ensuring the quality of the fuse detonator switch. Attached Figure Description

[0024] Figure 1 Schematic diagram of the internal structure of the rapid testing device for fuse detonator switches;

[0025] Figure 2 Side cross-sectional view of the rapid testing device for fuse detonator switch;

[0026] Figure 3 Schematic diagram of the locking mechanism;

[0027] Figure 4 : Connector structure diagram;

[0028] Figure 5 Signal feedback circuit diagram;

[0029] Figure 6 : Circuit diagram of fuse detonator switch (positioner is in compressed state).

[0030] The components are: 1-base, 2-bracket, 3-rolling bearing, 4-nut, 5-testing platform, 6-compression spring, 7-cover plate retaining ring, 8-cover plate, 9-long screw, 10-switch bracket, 11-limit key, 12-washer, 13-retaining ring, 14-switch under test, 15-screw, 16-locking mechanism, 17-locking spring, 18-connector, 19-operating lever, 20-stop lever, 21-gear bracket, 22-connector rotor, 23-connector housing. Detailed Implementation Plan

[0031] This utility model provides a rapid testing device for fuse detonator switches. The device comprises an automatic mechanical testing structure and a signal feedback circuit. The automatic mechanical testing structure includes a base 1, a bracket 2, a testing platform 5, a cover plate 8, a washer 12, a retaining ring 13, a cover plate retaining ring 7, a compression spring 6, a long screw 9, a nut 4, a switch bracket 10, a locking mechanism 16, a limit key 11, a rolling bearing 3, and a screw 15. The locking mechanism 16 consists of a connector 18, an operating lever 19, a stop bracket 21, a locking spring 17, and a stop lever 20. The connector 18 consists of a connector housing 23 and a connector rotor 22. The signal feedback circuit consists of a power supply, wires, a buzzer, a light-emitting diode, and a small alligator clip.

[0032] The base, bracket, test platform, and rolling bearings form the support for the testing device. The spring force of the locking mechanism applies a load to the switch. The limit key and cover plate are used to fix the position of the safety detonator switch. The test of the switch under 360° load is completed by rotating the test platform.

[0033] The connector housing, connector rotor, operating lever, stop frame, locking spring, and stop lever constitute the locking mechanism of the switch positioner. One end of the locking spring hooks onto the switch positioner, and the other end hooks onto the connector rotor. The radial tension of the locking spring on the switch positioner restricts the relative rotation between the switch positioner and the switch housing, thereby ensuring that the switch inspection angle reaches 360°. The connector housing, connector rotor, operating lever, and stop lever are assembled to form a stop lever, which, in conjunction with the stop frame, controls the extension length of the locking spring, thereby controlling the magnitude of the locking spring tension. The connector rotor can move freely within the connector housing, preventing resistance between the locking spring and the operating lever from affecting the inspection process.

[0034] The signal feedback circuit is connected according to the switch's required positions, using an LED and a buzzer as signal feedback. When the switch is in the test position (closed), the LED lights up and the buzzer sounds continuously; when it is in the open position, the LED turns off and the buzzer does not sound, indicating that the switch is unqualified. Only when the switch is in the closed state at all points within a 360° angle in both positions BK1 and BK2 is the switch considered a qualified product.

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all of the embodiments obtained. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0036] like Figure 1 and Figure 2As shown, the base 1 has a threaded hole in the center, which is threaded to one end of the bracket 2 and fixed together. The rolling bearing 3 is installed using the mechanical structure of the bracket 2 itself, and is connected to the bracket 2 as a whole using adhesive on the mating surface. The switch bracket 10 is fixed to the bracket 2 by keying on its structure. The mating surfaces of the detection platform 5 and the rolling bearing 3 are fixed together by interference fit to restrict their axial freedom and ensure stable support. On the upper surface of the detection platform 5, a long screw 9 is passed through the washer 12, the mounting hole of the cover plate 8, the retaining ring 13, the compression spring 6, and the mounting hole of the long screw 9 on the detection platform 5 in sequence. The long screw 9 is fixed to the detection platform 5 on the other side with a nut 4. The long screw 9 is also passed through the cover plate retaining ring 7, the compression spring 6, and the other mounting hole of the long screw 9 on the detection platform 5 in sequence. The long screw 9 is fixed to the detection platform 5 on the other side with a nut 4. On the lower surface of the test platform 5, four screws 15 are sequentially passed through the four screw mounting holes of the test platform 5 and the screw holes on the locking mechanism 16 to fix the locking mechanism 16 to the upper surface of the test platform 5. The end of the switch 14 under test with the positioner is vertically mounted on the center hole of the switch bracket 10, and two limit keys 11 are installed in the corresponding keyways of the switch 14 under test and the switch bracket 10 to restrict the rotational freedom of the switch 14 under test.

[0037] like Figure 3 As shown, the operating lever 19 is assembled into the cylindrical hole of the gear position frame 21 with clearance fit. Apply an appropriate amount of grease to the mating surfaces to ensure smooth relative movement between the two. The threaded end of the operating lever 19 points towards the center of the detection platform 5. Install and tighten the stop lever 20 on the threaded hole of the operating lever 19. Tighten the threaded end of the operating lever 19 to the connector 18. Install the ring at one end of the locking spring 17 on the through hole of the connector. After all the above assembly is completed, adjust the mating position of the stop lever 20 and the gear position frame 21 to ensure that they are properly mated.

[0038] like Figure 4 As shown, the small end of the connector rotor 22 is passed through the cylindrical hole of the connector housing 23 and pointed to the center of the test platform 5. This restricts the linear motion of the connector rotor, releases the rotational degree of freedom, and ensures that it can rotate freely in the cylindrical hole of the connector housing 23, preventing resistance from affecting the inspection process.

[0039] like Figure 5 As shown, the signal feedback circuit consists of a power supply, a buzzer, an LED, and two small alligator clips connected in series. The two small alligator clips are connected according to the required positions of the switch 14 under test. The LED and the buzzer serve as signal feedback. When the switch 14 under test is in the closed position, the LED lights up and the buzzer sounds continuously; when the switch is in the open position, the LED turns off and the buzzer does not sound, indicating that the switch is unqualified.

[0040] like Figure 6 As shown, the safety detonator switch acts as a signal switch for state transition. When the positioner is in the free state, the signal is in the working state (switch BK2 is closed, points 1 and 4 are connected; switch BK1 is open, points 2 and 3 are disconnected). When the positioner is in the compressed state, the signal is in the safety state (switch BK1 is closed, points 2 and 3 are connected; switch BK2 is open, points 1 and 4 are disconnected).

[0041] The entire working process of this embodiment is as follows:

[0042] Place the rapid testing device on a work platform. Position the fuse detonator switch to be tested vertically upwards onto the center hole of the switch bracket. Install two limit keys into the keyways of the switch and switch bracket to ensure the switch's spatial position is fixed within the rapid testing device and that there is no relative movement between the switch and the switch bracket. Place the free end ring of the locking spring onto the fuse detonator switch's positioner. Press the cover plate onto the top of the switch positioner and rotate it to lock it onto the cover plate retaining ring. The cover plate's rotation engages and disengages from the retaining ring. Adjusting the cover plate height allows for testing in both the fuse state (BK1 switch) and the operational state (BK2 switch). A radial tension force applied by the spring to the switch positioner restricts relative rotation between the positioner and the switch housing. A 360° constant load test is performed by rotating the testing platform. The two alligator clips of the signal feedback circuit are connected according to the required points of the switch to be tested. An LED and a buzzer serve as signal feedback. When the switch is in the closed position (test position), the LED lights up and the buzzer sounds continuously; when the switch is in the open position, the LED goes out and the buzzer does not sound, indicating that the switch is unqualified. (Example: To test a fuse detonator switch, connect the two alligator clips to points 1 and 4 of the switch respectively, and rotate the test platform to apply a constant load over 360°. Then connect the two alligator clips to points 2 and 3 of the switch respectively, and rotate the test platform to apply a constant load over 360°. Only when the switch is in the closed position at all points within a 360° angle in both positions BK1 and BK2 is the fuse detonator switch a qualified product.)

[0043] The stop lever and the stop frame work together to control the extension length of the locking spring, thereby controlling the spring tension. Therefore, it is also possible to apply variable load tests to the switch under test. The connector rotor can move freely within the connector housing to prevent resistance between the spring and the operating lever from affecting the testing process.

[0044] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this utility model without departing from the spirit and scope of the embodiments of this utility model. Therefore, if these modifications and variations to the embodiments of this utility model fall within the scope of the claims of this utility model and their equivalents, then this utility model also intends to include these modifications and variations.

[0045] In this invention, threaded connections, screw connections, and mechanical structure mating points can be replaced with adhesive bonding or other mechanical fixing methods; the testing method of applying a 360° load by rotating the testing platform can be replaced with applying a 360° load by changing linear motion to rotational motion; the method of connecting the two alligator clips of the signal feedback circuit to different contacts of the switch can be replaced with integrating the feedback circuit with the automatic mechanical detection structure as a whole for signal feedback.

[0046] This invention has been applied to the quality inspection of the safety detonator switch of a certain type of self-destruct device before it enters the factory or is installed. Its actual working effect is as follows:

[0047] 1) Improved testing efficiency and shortened testing cycle. Manually testing one switch takes 10 minutes, while using the rapid testing device takes only 1 minute, increasing efficiency by 900%. Manual testing causes thumb pain due to prolonged examination, limiting testing to no more than 20 switches per day; using the device, 60 switches can be tested in 1 hour. Manually testing a batch of 60 switches would take at least 3 days, while the device only requires 1 hour.

[0048] 2) Reduced operational difficulty. Manual testing requires high skill levels; inexperienced inspectors cannot perform the tests, and only experienced technicians can conduct them. Other inspectors cannot inspect the switches. Using the testing device reduces operational difficulty and labor intensity, making it usable by all inspectors and assembly personnel.

[0049] 3) The testing operation has small errors and high accuracy. It ensures that each switch is subjected to the same testing conditions, and that the batch quality testing and verification of the products are consistent.

[0050] 4) The testing conditions are variable and have a wide range. By adjusting different positions of the baffle, the simulated load conditions can be changed, making the quality testing of the product under test more comprehensive and with good coverage.

[0051] This technology has been applied to the quality inspection of fuse detonator switches in self-destruct safety devices. Addressing the low efficiency and inability to simulate 360° loads on the switch positioner during manual inspection, an automated mechanical structure is employed to simulate the stability of actual force signals on the fuse detonator switch. This simplifies manual inspection, reduces labor costs, shortens the inspection cycle, and improves efficiency and accuracy. It provides significant practical guidance for testing specific functions of fuse detonator switches and similar small-structure switches under special load conditions.

Claims

1. A device for rapid inspection of a safety initiator switch, characterized in that: The insurance detonator switch rapid detection device is composed of automatic mechanical detection structure and signal feedback circuit, The automatic mechanical detection structure comprises a base (1), a support (2), a rolling bearing (3), a nut (4), a detection platform (5), a compression spring (6), a cover clasp (7), a cover plate (8), a long screw rod (9), a switch support (10), a limiting key (11), a washer (12), a clasp (13), a detected switch (14), a screw (15) and a switch locking mechanism (16), One end of the support (2) is fixedly connected with the base (1); the other end of the support (2) is mechanically installed with the rolling bearing (3), which is connected with the support (2) as a whole by using an adhesive on a cooperation surface; the cooperation surface of the rolling bearing (3) and the detection platform (5) is fixed together by using interference fit, so that the axial degree of freedom is limited and stable support is ensured; On one side of the upper surface of the detection platform (5), the long screw rod (9) passes through the washer (12), the cover plate (8), the clasp (13), the compression spring (6) and the detection platform (5) in sequence, and is fixed on the other side of the detection platform (5) through the nut (4); on the other side of the upper surface of the detection platform (5), the long screw rod (9) passes through the cover plate (8), the cover clasp (7), the compression spring (6) and the detection platform (5) in sequence, and is fixed on the other side of the detection platform (5) through the nut (4); The switch support (10) is fixed with the support (2) through key position cooperation of the structure; one end of the detected switch (14) with a positioner is vertically installed on the center hole of the switch support (10), two limiting keys (11) are installed in the corresponding key grooves of the detected switch (14) and the switch support (10), and the rotation degree of freedom of the detected switch (14) is limited; a locking mechanism (16) is arranged on one side of the detected switch with the positioner, and the locking mechanism (16) is fixed on the upper surface of the detection platform (5) through the screw (15); The signal feedback circuit is composed of a power supply, a wire, a buzzer, a light emitting diode and a small alligator clip, and the signal feedback circuit is connected according to the required point position of the switch, and the light emitting diode and the buzzer are used as signal feedback.

2. The quick check device for a squib switch according to claim 1, characterized in that: The locking mechanism (16) is a limiting device of the switch positioner, and comprises a locking spring (17), a connector (18), an operating rod (19), a blocking rod (20) and a gear rack (21); one end of the locking spring (17) is sleeved on the switch positioner, the other end is connected with the connector (18), the operating rod (19) is assembled into the cylindrical hole of the gear rack (21), one end of the operating rod (19) with a thread is directed to the center of the detection platform (5), the blocking rod (20) is installed and tightened on the threaded hole of the operating rod (19), and one end of the operating rod (19) with a thread is cooperatively tightened with the connector (18).

3. The quick check device for a squib switch according to claim 2, characterized in that: The connector (18) comprises a connector rotor (22) and a connector housing (23), the connector rotor (22) passes through the cylindrical hole of the connector housing (23) and points to the center of the detection platform (5), limits the linear motion of the connector rotor, releases the rotation freedom, ensures the rotation freedom of the connector rotor in the cylindrical hole of the connector housing (23), and prevents the resistance from affecting the inspection process.

4. The quick check device for insurance detonator switch according to claim 1, characterized in that: The cover plate (8) limits the position of the switch positioner, ensures the correct position of the switch positioner, adjusts the height of the cover plate, realizes the detection of the safety state (BK1 switch) and the working state (BK2 switch), and realizes the cooperation and separation of the cover plate and the cover plate clasp (7) through rotation.

5. The quick check device for insurance detonator switch according to claim 1, characterized in that: The base (1) is centrally provided with a threaded hole, and the threaded end of the support (2) is fixed together through threaded connection.

6. The quick check device for insurance detonator switch according to claim 2, characterized in that: The operating rod (19) is assembled into the cylindrical hole of the gear frame, is in clearance fit, is coated with an appropriate amount of lubricating grease on the cooperation surface, and ensures smooth relative motion between the operating rod (19) and the gear frame.

7. The quick check device for insurance detonator switch according to claim 4, characterized in that: The signal feedback circuit is connected in series by a power supply, a buzzer, a light emitting diode and two small alligators, the two small alligators are connected according to the required point of the detected switch (14), the light emitting diode and the buzzer are used as signal feedback, when the detected switch (14) is in the closed state in the inspection position, the light emitting diode is bright and the buzzer continuously emits sound; when the position is in the open state, the light emitting diode is extinguished and the buzzer does not emit sound, indicating that the switch is unqualified.

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