Thermal insulation device for accelerometer test

Abstract

The utility model discloses a heat preservation device for accelerometer testing, which comprises a base, a main shaft is rotatably mounted in the middle of the base, one end of the main shaft is fixedly connected with a hand wheel, the other end of the main shaft is in threaded connection with a positioning table, and the other end of the positioning table is in threaded connection with an accelerometer fixing table. One end of the accelerometer fixing table away from the positioning table is fixedly connected with a diversion sleeve; a heating frame is arranged on the periphery of the accelerometer fixing table and fixedly connected with the flow guide sleeve, a heat preservation cover is sleeved on the periphery of the heating frame and the flow guide sleeve, one end of the heat preservation cover is sleeved on the positioning table, and an end cover is arranged at the other end of the heat preservation cover. According to the utility model, the test requirements of the accelerometer at different attitudes and different temperatures can be realized, the stability of the temperature environment is ensured, and the stability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of accelerometer testing, in particular to a heat preservation device used for accelerometer testing. Background Art

[0002] An accelerometer is an instrument that can measure the acceleration of an object. Accelerometer testing refers to the process of verifying and calibrating an accelerometer. Accelerometer testing can ensure its accuracy and reliability, as well as correct possible errors. It is widely used in technical fields such as inertial navigation.

[0003] The accuracy of accelerometers is critical to inertial navigation systems. In the field of inertial navigation, accelerometers need to be tested for a long time and multiple cycles at room temperature and high temperature, especially temperature dependence testing. By testing accelerometers in different temperature environments, it is possible to evaluate whether their output is affected by temperature. This is because temperature changes may cause the performance of the accelerometer to shift, so a stable and reliable temperature control system is required under high temperature conditions to ensure the reliability of the test data.

[0004] Generally, finished product temperature test chambers are used for testing. However, temperature test chambers have disadvantages such as large size, large vibration, and difficult operation. During the accelerometer test process, they are easily affected by vibration or other unstable factors, resulting in errors in the test data and affecting the quality of the accelerometer in the later use. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a heat preservation device for accelerometer testing, which can effectively solve the problems of large size, large vibration, and difficult operation of the existing temperature test box.

[0006] The specific technical scheme of the utility model is: a heat preservation device for accelerometer testing, comprising a base, a main shaft is rotatably installed in the middle of the base, one end of the main shaft is fixedly connected to a hand wheel, and the other end is threadedly connected to a positioning platform, and the other end of the positioning platform is simultaneously threadedly connected to an accelerometer fixing platform, the main shaft is coaxial with the accelerometer fixing platform, and one end of the accelerometer fixing platform away from the positioning platform is fixedly connected to a guide sleeve;

[0007] A heating frame is arranged on the periphery of the accelerometer fixing platform, the heating frame is fixedly connected to the guide sleeve, a heat preservation cover is arranged on the periphery of the heating frame and the guide sleeve, one end of the heat preservation cover is sleeved on the positioning platform, and the other end is arranged with an end cover.

[0008] Furthermore: a motor bracket is fixedly installed on the end face of the end cover, a motor is fixedly installed on the motor bracket, a through hole is provided in the middle of the motor bracket, an output shaft of the motor is inserted into the through hole of the motor bracket and connected to the adapter, the other end of the adapter is fixedly connected to the fan shaft through an elastic coupling, the fan shaft passes through the end cover, and the end is fixedly connected to the circulation fan.

[0009] Furthermore: four adjusting feet are arranged at the bottom of the base.

[0010] Furthermore: a thermocouple is arranged below the circulation fan, and the thermocouple is fixedly mounted on the end cover.

[0011] Furthermore: a snap connection is provided between the heat-insulating cover and the positioning platform.

[0012] Furthermore, a plurality of positioning holes are distributed circumferentially on the positioning platform, a knob plunger indexing pin is provided on the base, and the knob plunger indexing pin is telescopically arranged opposite to the positioning hole.

[0013] Furthermore: the heating frame is provided with a plurality of groups of spiral grooves, and the heating electric furnace wires are wound in the spiral grooves.

[0014] Compared with the prior art, the beneficial effects of the utility model are embodied in:

[0015] 1. The utility model has a small and compact structure and is easy to open and close, which makes it convenient for testers to replace the accelerometer. At the same time, when used in conjunction with a rotating handwheel, the accelerometer can be rotated synchronously to achieve measurement of the accelerometer in different postures, which is beneficial to improving test accuracy.

[0016] 2. This new model uses thermocouples and heating electric furnace wires to control the internal test temperature, and is equipped with a circulating fan to make the internal temperature uniform.

[0017] 3. The utility model can meet the test requirements of the accelerometer in different postures and at different temperatures, provide a good environment for the test of the accelerometer, improve the traditional test conditions, and has a good application prospect.

[0018] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or will be understood by implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a longitudinal sectional view of the device of the utility model;

[0020] Figure 2 is a schematic diagram of the structure of the accelerometer fixing platform;

[0021] Figure 3 is a schematic diagram of the heating rack structure;

[0022] Figure 4 It is a diagram of the snap connection between the positioning table and the thermal insulation cover;

[0023] Figure 5 It is a schematic diagram of the connection between the knob plunger indexing pin on the base and the positioning sleeve of the positioning platform.

[0024] In the figure, 1-base, 2-spindle, 3-handwheel, 4-positioning table, 5-insulation cover, 6-motor, 7-heating frame, 8-rolling bearing, 9-flat key, 10-accelerometer fixing table, 11-guide sleeve, 12-end cover, 13-motor bracket, 14-adapter, 15-elastic coupling, 16-fan shaft, 17-circulating fan, 18-thermocouple, 19-adjusting foot, 20-positioning sleeve, 21-buckle, 22-bearing cover, 23-bracket, 24-knob plunger indexing pin. DETAILED DESCRIPTION

[0025] The utility model is described in detail below in conjunction with the accompanying drawings and embodiments, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the utility model to illustrate the utility model. However, those skilled in the art should know that the following embodiments are not the only limitations on the technical scheme of the utility model, and any equivalent changes or modifications made under the spirit of the technical scheme of the utility model shall be deemed to belong to the protection scope of the utility model.

[0026] like Figure 1 As shown, a heat preservation device for accelerometer testing includes main components including a base 1, a spindle 2, a positioning platform 4, a heat preservation cover 5, a heating frame 7, and an accelerometer fixing platform 10.

[0027] A main shaft 2 is rotatably mounted in the middle of the base 1, and the part of the main shaft 2 in the base 1 is supported by a rolling bearing 8, and the rolling bearing 8 is fixedly mounted in the base 1; a handwheel 3 is fixedly connected to the outer end of the main shaft 2, and a positioning platform 4 is arranged at the inner end; the positioning platform 4 is arranged on the outer side of the main shaft 2 through a threaded sleeve, and at the same time, the end of the positioning platform 4 away from the main shaft 2 is also arranged on the outer side of the accelerometer fixing platform 10 through a threaded sleeve, and the main shaft 2 can drive the positioning platform 4 and the accelerometer fixing platform 10 to rotate at the same time.

[0028] The accelerometer fixing platform 10 is partially screwed onto the positioning platform 4 and partially extends out of the positioning platform 4. The structure of the accelerometer fixing platform 10 is as follows: Figure 2 As shown, three accelerometer mounting holes are provided on the extended portion for mounting X, Y, and Z three-axis accelerometers.

[0029] A heating frame 7 is disposed on the periphery of the accelerometer fixing platform 10. The structure of the heating frame 7 is as follows: Figure 3As shown, the heating frame 7 is a cylindrical cover arranged on the periphery of the accelerometer fixing platform 10 to heat the surrounding environment of the accelerometer. The heating frame 7 is provided with a plurality of groups of spiral grooves, and the heating electric furnace wires are wound in the spiral grooves. The end of the heating frame 7 away from the positioning platform 4 is fixedly connected to the guide sleeve 11, and the guide sleeve 11 is fixed to the end of the accelerometer fixing platform 10. The guide sleeve 11 and the heating frame 7 are provided with a heat preservation cover 5 on the periphery; one end of the heat preservation cover 5 is sleeved with the end of the positioning platform 4, and the other end is sleeved with the guide sleeve 11; the end of the heat preservation cover 5 away from the positioning platform 4 is provided with an end cover 12, and the end cover 12 is fixedly mounted on the heat preservation cover 5 by screws. The space enclosed by the positioning platform 4, the heat preservation cover 5, and the end cover 12 creates a stable temperature environment to heat the accelerometer fixing platform 10 and the accelerometer thereon.

[0030] The device also provides an air flow stirring mechanism for maintaining a balanced temperature. A motor bracket 13 is fixedly mounted on the end surface of the end cover 12, and a motor 6 is fixedly mounted on the motor bracket 13. The middle part of the motor bracket 13 is a through-hole design, and the output shaft of the motor 6 penetrates into the through-hole of the motor bracket 13 and is connected to the adapter 14. An elastic coupling 15 is provided at one end of the adapter 14 away from the motor 6 and is fixedly connected thereto. A fan shaft 16 is provided at the other end of the elastic coupling 15 and is fixedly connected thereto. The fan shaft 16 passes through the end cover 12 and is rotatably connected thereto. The fan shaft 16 extends into the guide sleeve 11, and a circulating fan 17 is fixedly connected at its end. The circulating fan 17 is placed in the space for heating the accelerometer. A thermocouple 18 is provided below the circulating fan 17, and the thermocouple support rod is fixedly mounted on the end cover 12. Through the stirring of the circulating fan 17, the heat in the heating space of the accelerometer can be effectively circulated to balance the temperature.

[0031] Furthermore, the base 1 is a main body support, and in order to stabilize the base, four adjustment feet 19 are provided at the bottom of the base 1 .

[0032] Furthermore, a keyway is provided on the main shaft 2, and a flat key 9 is fixedly installed in the keyway. The flat key 9 is butted against the keyway on the hand wheel 3 to prevent the hand wheel 3 from being disengaged.

[0033] Furthermore, a groove is formed on the main shaft 2, and a bearing cover 22 is arranged in the groove. The bearing cover 22 is fixedly connected to the end of the base 1 to protect the bearing inside.

[0034] Furthermore, in order to prevent the positioning platform 4 from being separated from the heat preservation cover 5, a buckle 21 is provided on the heat preservation cover 5, and the buckle 21 connects the positioning platform 4 and the heat preservation cover 5 together. Figure 4 shown.

[0035] Furthermore, the device also has an accelerometer rotation indexing recording function. In order to record the angle of each rotation test of the accelerometer, typical angle marking holes such as 0°, 30°, 45°, 60°, 90°, and 180° are arranged around the positioning table 4, and a positioning sleeve 20 is inlaid on the hole; a knob plunger indexing pin 24 is arranged on one side of the base 1, and the knob plunger indexing pin 24 is fixedly installed on one side of the base 1 through a bracket 23. The positioning sleeve 20 can be connected with the knob plunger indexing pin 24 arranged on the base 1, such as Figure 5 As shown, the knob plunger indexing pin 24 can be pulled outward and lifted and has an automatic rebound function.

[0036] The working principle of the utility model is as follows: when the device is used, the base is first leveled, and the level is used to adjust the adjustment feet at the bottom of the base to ensure that the reference surface of the device is flush with the horizontal plane; then the end cover and the motor system, the heat preservation cover, the guide sleeve, and the heating frame are removed, and the accelerometer is placed on the accelerometer fixing table and checked whether the accelerometer is flat; after confirming that the accelerometer is correctly installed, the heat preservation cover, the heating frame, and the guide sleeve are installed, and the end cover is covered with the motor system and the power supply is connected. After power is turned on, the electric furnace wire is powered on to start heating, and the motor is turned on to drive the circulation fan to start rotating, so that the internal thermal field is uniform. The internal environmental temperature is monitored by the thermocouple installed on the thermocouple support rod. When the internal temperature reaches the test required temperature, the external temperature controller is automatically powered off to ensure that the temperature will not continue to rise. When the temperature drops, the temperature controller is automatically powered on for heating to ensure the internal environmental temperature. When the accelerometer needs to adjust its position, just lift the knob plunger indexing pin and turn the handwheel. The handwheel will drive the spindle and the accelerometer fixing table to rotate. When the required position of the experiment is reached, release the knob plunger indexing pin to dock with the positioning sleeve on the positioning table. At this time, the position of the accelerometer fixing table is fixed and cannot rotate, which can meet the test requirements of the accelerometer in different postures.

[0037] Although the embodiments of the present invention have been shown and described above, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat preservation device for accelerometer testing, characterized in that: The invention comprises a base (1), a main shaft (2) is rotatably mounted in the middle of the base (1), one end of the main shaft (2) is fixedly connected to a hand wheel (3), and the other end is threadedly connected to a positioning platform (4), and the other end of the positioning platform (4) is simultaneously threadedly connected to an accelerometer fixing platform (10), the main shaft (2) and the accelerometer fixing platform (10) are coaxial, and the end of the accelerometer fixing platform (10) away from the positioning platform (4) is fixedly connected to a guide sleeve (11); A heating frame (7) is arranged on the periphery of the accelerometer fixing platform (10), the heating frame (7) is fixedly connected to the flow guide sleeve (11), a heat preservation cover (5) is arranged on the periphery of the heating frame (7) and the flow guide sleeve (11), one end of the heat preservation cover (5) is sleeved on the positioning platform (4), and the other end is provided with an end cover (12).

2. The heat preservation device for accelerometer testing according to claim 1, characterized in that: A motor bracket (13) is fixedly mounted on the end surface of the end cover (12), a motor (6) is fixedly mounted on the motor bracket (13), a through hole is provided in the middle of the motor bracket (13), an output shaft of the motor (6) is inserted into the through hole of the motor bracket (13) and connected to an adapter (14), the other end of the adapter (14) is fixedly connected to a fan shaft (16) via an elastic coupling (15), the fan shaft (16) passes through the end cover (12), and an end portion is fixedly connected to a circulation fan (17).

3. The heat preservation device for accelerometer testing according to claim 1, characterized in that: Four adjusting feet (19) are arranged at the bottom of the base (1).

4. The heat preservation device for accelerometer testing according to claim 2, characterized in that: A thermocouple (18) is arranged below the circulation fan (17), and the thermocouple (18) is fixedly mounted on the end cover (12).

5. The heat preservation device for accelerometer testing according to claim 1, characterized in that: A buckle (21) is provided between the heat-insulating cover (5) and the positioning platform (4) for connection.

6. The heat preservation device for accelerometer testing according to claim 1, characterized in that: The positioning platform (4) is provided with a plurality of positioning holes distributed circumferentially, and the base (1) is provided with a knob plunger indexing pin (24), and the knob plunger indexing pin (24) is telescopically arranged opposite to the positioning hole.

7. The heat preservation device for accelerometer testing according to claim 1, characterized in that: The heating frame (7) is provided with a plurality of groups of spiral grooves, and heating electric furnace wires are wound in the spiral grooves.

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