Gyroscope locking mechanism spark extinguishing test circuit

Abstract

The utility model provides a gyroscope locking mechanism spark extinguishing test circuit, and belongs to the technical field of inertial devices. Comprising an electromagnet assembly arranged in the gyroscope, the electromagnet assembly comprises an electromagnet winding circuit, the electromagnet winding circuit comprises a starting coil Q1 and a holding coil Q2, the starting coil Q1 and the holding coil Q2 are connected in series, and a normally-closed switch K is connected to the holding coil Q2 in parallel; the device further comprises a time-delay relay spark extinguishing circuit, and the time-delay relay spark extinguishing circuit is externally connected in gyroscope test equipment and is connected with the holding coil Q2 in parallel. According to the utility model, the time-delay relay spark extinguishing circuit is added in the test equipment, the contact pressure of the normally-closed contact assembly is increased, the problem of poor contact caused by carbon deposition caused by contact arc sparks in the production test process of the gyroscope is solved, the fault mode that the contact resistance of the unlocking loop of the gyroscope is increased is eliminated, and the reliability of the gyroscope is improved. The working reliability of the gyroscope is improved, and the stable operation of the system is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of inertial devices, and particularly relates to a spark extinguishing test circuit of a gyro locking mechanism. Background Art

[0002] A roll gyroscope (hereafter referred to as a gyroscope or gyro) is a three-degree-of-freedom gyroscope and serves as an inertial reference device in missile autopilot systems. The gyroscope's rotation axis remains stable relative to inertial space, measuring the carrier's roll angle and providing a roll angle signal to control stable flight. Compared to navigation gyroscopes used on aircraft and ships, gyroscopes offer advantages such as rapid startup, short operating time, single-use after launch, high shock overload, compact size, light weight, and high reliability.

[0003] like Figure 2 The gyro structure shown is secured to the measured carrier via a mounting plate. The measurement axis is parallel to the carrier's flight direction. Gyro motors mounted at the center of the inner and outer rings rotate at high speed, generating the angular momentum required by the gyro. This creates a three-degree-of-freedom free gyro, with its rotation axis remaining stable relative to inertial space. When the measured carrier is not in operation, a locking mechanism locks the inner and outer rings 11 and 10, maintaining the gyro's rotation axis, inner ring axis, and outer ring axis perpendicular to each other. When the carrier is in operation, the mechanism unlocks. When the carrier rolls, a potentiometer 12 fixed to the gyro ring frame and a potentiometer brush 13 fixed to the housing 9 rotate relative to each other, thereby measuring the carrier's roll angle.

[0004] To ensure rapid startup, the gyro unlocking mechanism uses a double-winding coil electromagnet assembly with a center tap, such as Figure 4 As shown. There are two coils in the electromagnet assembly, namely the starting coil Q1 with small resistance and the holding coil Q2 with large resistance. Before the electromagnet is actuated, the holding coil Q2 is short-circuited due to the action of the normally closed switch K. The starting coil Q1 passes a large current of 4A, which can enable the electromagnet to instantly generate a large suction force, so that the locking mechanism is instantly started within 20ms. The fixed axis rotation mechanism of the arm combination drives the normally closed contact K to disconnect, and the circuit is switched to 176Ω after the starting coil and the holding coil are connected in series. The current drops to less than 0.2A, generating a suction force sufficient to overcome the torque of the torsion spring. The locking mechanism of the gyroscope is shown as follows. Figure 3 This design structure ensures instant and reliable unlocking while preventing the coil Q1 from burning out due to high current and long duration, thus ensuring the long-term stable operation of the gyroscope.

[0005] The gyroscope's technical specifications require that the contact resistance of the 14-16 pin interface in the electromagnet assembly be less than 0.5Ω. This resistance is defined by the wire connection between the normally closed contact assembly K and the loop. The normal value is less than half of the required value. However, during production and user experience, some products were found to have excessively increased contact resistance, leading to production halts and customer complaints. Analysis of the faulty products revealed that the cause of the failure was sparks and carbon deposits caused by the interruption of current by the switch contacts during repeated testing. This caused an abnormal increase in contact resistance and poor contact, impacting system reliability and stability.

[0006] Due to its launch-on-missile nature and single-use after launch, the gyroscope operates for a short time and starts quickly. Furthermore, the gyroscope is sealed, and the interior of the finished product is evacuated and filled with inert gas, which also helps suppress sparks. However, during the production process, the gyroscope was not sealed or filled with gas. Gyroscopes are used in missile-mounted autopilot systems, and pin 16 of the gyro terminal is defined as a spark suppression circuit output. This indicates that this issue was fully considered during system design, and appropriate arc suppression measures were implemented. Therefore, minimizing the impact of sparks during production and testing effectively ensures product quality and meets user requirements.

[0007] Arcing is a physical phenomenon. The fundamental reason switch contacts arc when breaking current is that excessive current in the circuit prevents the self-inductance generated by the inductive load from dissipating quickly, resulting in large sparks when the contacts separate. Poor contact, material wear, and oxidation can also cause sparks.

[0008] In order to solve the above problems, an RC spark extinguishing circuit is used in the prior art, and its principle diagram is shown in FIG. Figure 5 As shown. This is a commonly used arc extinguishing circuit in relays. It uses the instantaneous charging and discharging characteristics of capacitors to absorb part of the electric field energy and reduce the intensity of sparks. Its RC value is adjusted through parameter design and repeated tests. After the circuit is connected, the locking component 14 is placed in a dark room and the spark brightness is compared with the components without any arc extinguishing measures. This has a certain inhibitory effect on the spark. The adoption of this circuit only suppresses the intensity of the spark and does not completely eliminate the existence of the spark. In order to minimize the loss of the contact components during the manufacturing test process and ensure user use, a more reliable solution is needed. Utility Model Content

[0009] The technical problem solved by the utility model is to provide a spark extinguishing test circuit for a gyroscope locking mechanism. The utility model improves the gyroscope electromagnet winding test circuit based on the original technical state of the product in view of the application characteristics of the gyroscope, and solves the poor contact fault caused by carbon deposits caused by contact arc sparks during the production test of the gyroscope.

[0010] In order to achieve the above-mentioned purpose, the technical solution adopted by this utility model is:

[0011] A spark extinguishing test circuit for a gyro locking mechanism includes an electromagnet assembly disposed in a gyroscope, the electromagnet assembly including an electromagnet winding circuit, the electromagnet winding circuit including a starting coil Q1 and a holding coil Q2, the starting coil Q1 and the holding coil Q2 being connected in series, and a normally closed switch K being connected in parallel to the holding coil Q2;

[0012] It also includes a time delay relay spark extinguishing circuit, which is externally connected to the gyroscope test equipment and is connected in parallel with the holding coil Q2.

[0013] To further limit the above solution, the delay relay spark extinguishing circuit includes a delay switch K1, which is connected in parallel with the holding coil Q2. The delay switch K1 continues to be turned on for 100ms after the normally closed switch K is turned off.

[0014] To further define the above solution, the silver contact of the normally closed contact of the normally closed switch K is connected to the spring by riveting. During riveting, the contact is first roughened with a flat punch, then riveted with a spherical punch, and the contact assembly is brazed.

[0015] To further limit the above solution, the starting coil Q1 is 6Ω, and the holding coil Q2 is 170Ω.

[0016] To further limit the above solution, the two ends of the starting coil Q1 and the holding coil Q2 after being connected in series are the 14th pin of the terminal and the 15th pin of the terminal respectively, the 14th pin of the terminal is connected to the power supply +27V, and the 15th pin of the terminal is grounded.

[0017] To further limit the above solution, the connection between the starting coil Q1 and the holding coil Q2 leads to the 16th pin of the terminal, and the 16th pin of the terminal is the extinguishing spark output.

[0018] The advantages of this utility model compared with the prior art are:

[0019] 1. This solution is based on the application characteristics of the gyroscope. Under the original technical status of the product, by connecting an external delay relay spark extinguishing circuit in the test equipment, the sparking phenomenon of the internal contacts of the gyroscope is fundamentally eliminated;

[0020] 2. This solution increases the contact pressure of the normally closed contact assembly, improves the contact riveting process and rust removal and rust prevention measures, thereby improving the contact reliability between the contacts. This fundamentally solves the problem of poor contact of the gyroscope in various manufacturing and testing links, which affects the reliability of the system.

[0021] 3. This solution fundamentally addresses the problem of poor contact caused by carbon deposits due to contact sparking during gyroscope production testing, completely eliminating the failure mode of increased contact resistance in the gyroscope's unlocking circuit, significantly improving production efficiency. It also effectively enhances the gyroscope's reliability within its specified operating time and lifespan, ensuring the stable operation of the autonomous driving system.

[0022] 4. This solution does not change the gyroscope's internal structure, materials, circuits, or interface definitions, and will not affect its size, weight, or other performance. It is easy to operate, has good processability, high production efficiency, and saves costs. It has been proven in practice to be effective and has high application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The schematic diagram of the spark extinguishing circuit of the time delay relay provided by the utility model;

[0024] Figure 2 It is a schematic diagram of the gyroscope structure in the prior art;

[0025] Figure 3 It is a structural diagram of a gyro locking assembly in the prior art;

[0026] Figure 4 It is a schematic diagram of the electromagnet winding circuit in the prior art;

[0027] Figure 5 This is a schematic diagram of an RC spark extinguishing circuit in the prior art. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] It should be noted that, as used herein, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising the elements.

[0030] See also Figure 1-5, describe in detail the embodiments of the present utility model.

[0031] Example: A spark extinguishing test circuit for a gyro locking mechanism, see Figure 1 As shown, the gyroscope includes an electromagnet assembly 2 housed within a gyroscope 1. The electromagnet assembly 2 includes an electromagnet winding circuit 3, which includes a starting coil Q14 and a holding coil Q25. The starting coil Q14 is 6Ω, and the holding coil Q25 is 170Ω. The starting coil Q14 and the holding coil Q25 are connected in series, and a normally closed switch K6 is connected in parallel to the holding coil Q25. The connecting ends of the starting coil Q14 and the holding coil Q25 are connected to terminal pins 14 and 15, respectively. Terminal pin 14 is connected to a +27V power supply, and terminal pin 15 is grounded. The connection between the starting coil Q14 and the holding coil Q25 leads to terminal pin 16, which is the spark extinguishing output.

[0032] The device also includes a time delay relay spark extinguishing circuit 7, which is externally connected to the gyroscope 1 test equipment and connected in parallel with the holding coil Q2 5. Specifically, the time delay relay spark extinguishing circuit 7 includes a time delay switch K1 8, which is connected in parallel with the holding coil Q2 5. The time delay switch K1 8 remains on for 100ms after the normally closed switch K6 is opened.

[0033] The operating principle and process of this embodiment are described as follows: When the electromagnet is energized, both the normally closed switch K and the time delay switch K1 are in the on state, and the current is diverted through the normally closed switch K and the time delay switch K1. After the electromagnet is closed, the normally closed switch K is disconnected due to mechanical action (within 20ms). During disconnection, because the time delay switch K1 remains in the on state within the 100ms delay, the current flows entirely through the time delay switch K1, and no spark is generated at the normally closed switch K. When the delay switch K1 is turned on and the 100ms delay ends, sparks are generated at the delay switch K1 due to the aforementioned reasons. Because the eight contacts of the delay switch K1 are external to the test equipment, their maintenance and replacement are not restricted by the product structure and appearance. In addition, the selected time delay relay has a service life of over 100,000 cycles, which can also meet test requirements.

[0034] In a specific embodiment, the silver contact of the normally closed contact of the normally closed switch K6 is connected to the spring by riveting. During riveting, the contact is first roughened with a flat punch, then riveted with a spherical punch, and the contact assembly is brazed.

[0035] The silver contact of the normally closed contact and the spring are connected by riveting. The original riveting fixture used only a single spherical punch for riveting. If improper force was applied during riveting, the contact deformation would be minimal. After the assembly was continuously hammered for a period of time, the contact loosened. When power was applied, the unreliable contact accelerated sparking and carbon deposits, increasing contact resistance. This improved riveting process by first roughening the contact with a flat punch, then riveting with a spherical punch, and then brazing the contact assembly. After these measures were implemented, the contact loosening after hammering has ceased.

[0036] Through experiments and comparative analysis, this embodiment adopts the method of adding a time-delay relay spark extinguishing circuit in the test equipment, increasing the contact pressure of the normally closed contact assembly, improving the contact riveting process and rust prevention and rust removal measures, thereby improving the contact reliability between the contacts, solving the problem of poor contact caused by carbon deposits caused by contact arc sparks during the production test of the gyroscope from the source, and completely eliminating the failure mode of increased contact resistance of the gyroscope unlocking circuit, effectively improving the working reliability of the gyroscope and ensuring the stable operation of the system.

[0037] Furthermore, the present invention does not alter the gyroscope's internal structure, materials, circuitry, or interface definitions, nor does it affect its size, weight, or other performance. It offers ease of operation, excellent processability, high production efficiency, and cost savings. Practical verification demonstrates significant effectiveness and high application value.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0039] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A spark extinguishing test circuit for a gyro locking mechanism, comprising an electromagnet assembly (2) disposed in a gyroscope (1), wherein the electromagnet assembly (2) includes an electromagnet winding circuit (3), and is characterized in that: The electromagnet winding circuit (3) comprises a starting coil Q1 (4) and a holding coil Q2 (5), wherein the starting coil Q1 (4) and the holding coil Q2 (5) are connected in series, and a normally closed switch K (6) is connected in parallel to the holding coil Q2 (5); It also includes a time delay relay spark extinguishing circuit (7), which is externally connected to the gyroscope (1) test equipment and is connected in parallel with the holding coil Q2 (5).

2. A spark extinguishing test circuit for a gyro locking mechanism according to claim 1, characterized in that: The delay relay spark extinguishing circuit (7) includes a delay switch K1 (8), which is connected in parallel with the holding coil Q2 (5). The delay switch K1 (8) continues to be turned on for 100ms after the normally closed switch K (6) is disconnected.

3. A spark extinguishing test circuit for a gyro locking mechanism according to claim 1, characterized in that: The silver contact of the normally closed contact of the normally closed switch K (6) is connected to the spring by riveting. When riveting, the contact is firstly roughened with a flat punch, and then riveted with a spherical punch, and the contact assembly is brazed.

4. A spark extinguishing test circuit for a gyro locking mechanism according to claim 1, characterized in that: The starting coil Q1 (4) is 6Ω, and the holding coil Q2 (5) is 170Ω.

5. The spark extinguishing test circuit of a gyro locking mechanism according to claim 1, characterized in that: The two ends of the starting coil Q1 (4) and the holding coil Q2 (5) after being connected in series are the 14th pin of the terminal and the 15th pin of the terminal respectively. The 14th pin of the terminal is connected to the power supply +27V, and the 15th pin of the terminal is grounded.

6. A spark extinguishing test circuit for a gyro locking mechanism according to claim 1, characterized in that: The connection point between the starting coil Q1 (4) and the holding coil Q2 (5) leads to the 16th pin of the terminal, and the 16th pin of the terminal is the extinguishing spark output.

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