High-low-temperature high-frequency angular vibration device based on hydrostatic shafting

Abstract

The invention discloses a high-low temperature high-frequency angular vibration device based on a hydrostatic shaft system, which comprises a high-frequency angular vibration table, a high-low temperature box and a control system, and is characterized in that the high-frequency angular vibration table comprises a base, a hydrostatic bearing, a torque motor, an adapter, an encoder, a conductive slip ring, a thermal insulation shaft and a workbench; the base is located at the bottom, the torque motor stator is fixedly connected with the base and located in the base, the torque motor rotor is connected with the internal motor shaft, the hydrostatic bearing is located on the outer circumference of the base, and the top of the motor shaft is fixedly connected with the hydrostatic bearing through the adapter. An encoder is arranged at the bottom shaft end of the motor shaft; the conductive slip ring is mounted on the encoder; the top of the adapter is connected with a workbench located in the high-low temperature box through a thermal insulation shaft. The control system controls the temperature of the high-low temperature box and the angular frequency, the angular rate and the angular position of the high-frequency angular vibration table. According to the invention, high-frequency angular vibration can be realized in high and low temperature environments.

Description

Technical Field

[0001] The present invention relates to the technical field of inertial device testing apparatuses, and particularly relates to a high and low temperature high frequency angular vibration device based on a hydrostatic bearing system. Background Art

[0002] For missile weapons, in addition to strike accuracy, improving survivability is also an important research direction. As a key device for monitoring the attitude change of missile weapons, inertial devices can provide autonomous navigation capabilities for missiles, thereby improving strike accuracy. At the same time, rapid launch is one of the key ways to improve the survivability of missiles, and an important preparatory work before launch is the preheating of the inertial navigation system. If the index parameters of inertial devices in different temperature environments can be pre-calibrated, the preheating time of the inertial navigation system can be significantly shortened, achieving the goal of rapid launch.

[0003] In order to achieve the purpose of rapid launch, pre-calibrating the parameters of inertial devices in high and low temperature environments is an effective means. Existing high and low temperature calibration systems for inertial devices can already meet the calibration requirements of angular position and angular velocity in high and low temperature environments, but in terms of calibrating high frequency angular vibration parameters, the method of separating high and low temperature conditions from high frequency angular vibration is still adopted, and the angular vibration characteristics in high and low temperature environments cannot be accurately restored. Therefore, studying the high frequency angular vibration calibration method under high and low temperature conditions will effectively improve the navigation accuracy of the inertial navigation system under high frequency angular vibration and high and low temperature change conditions, providing technical support for shortening the preheating time.

[0004] By performing metrological calibration on inertial devices under high and low temperature conditions and pre-calibrating the compensation parameters for each temperature environment, the environmental adaptability of the inertial navigation system under high and low temperature conditions can be significantly improved, thereby enhancing the rapid launch ability of missiles. This research direction not only helps to improve the strike accuracy of missiles, but also further enhances their survivability, providing important support for the practical application of missile weapons.

[0005] Currently, there are many researches and developments on high angular rate, high acceleration, and low frequency angular vibration devices under high and low temperature conditions in the market. The low frequency angular vibration parameters are generally dozens of hertz. However, the research and development of high frequency angular vibration devices under high and low temperature conditions are still in a blank state, resulting in the inability of existing devices to meet relevant test requirements. Therefore, developing a device that can achieve high frequency angular vibration in high and low temperature environments has important practical significance. Summary of the Invention

[0006] In view of this, the present invention provides a high and low temperature high frequency angular vibration device based on a hydrostatic bearing system, which can achieve high frequency angular vibration in high and low temperature environments.

[0007] The technical solution adopted by the present invention is as follows:

[0008] A high and low temperature high-frequency angular vibration device based on a hydrostatic shafting system, comprising a high-frequency angular vibration table, a high and low temperature chamber and a control system. The high-frequency angular vibration table includes a base, a hydrostatic bearing, a torque motor, a transfer piece, an encoder, a conductive slip ring, a heat-insulating shaft and a workbench;

[0009] The base is located at the bottom. The stator of the torque motor is fixedly connected to the base and is located inside the base. The rotor of the torque motor is connected to the internal motor shaft. The hydrostatic bearing is located on the outer circumference of the base, and the top of the motor shaft is fixedly connected to the hydrostatic bearing through a transfer piece. An encoder is provided at the bottom shaft end of the motor shaft, and the conductive slip ring is installed on the encoder. The top of the transfer piece is connected to the workbench located inside the high and low temperature chamber through a heat-insulating shaft. The control system controls the temperature of the high and low temperature chamber and the angular frequency, angular velocity and angular position of the high-frequency angular vibration table.

[0010] Further, the hydrostatic bearing includes a bearing seat, an upper bearing sleeve, a static pressure shaft and a lower bearing sleeve;

[0011] The static pressure shaft is hollow inside and has a shoulder in the middle of its outer circumference. The upper bearing sleeve and the lower bearing sleeve are respectively sleeved on the outer circumference of the static pressure shaft and are respectively located above and below the shoulder. At the same time, the upper bearing sleeve and the lower bearing sleeve are both fixed in the bearing seat;

[0012] The bearing seat is provided with an oil inlet hole. Oil grooves are opened in the bearing seat, the upper bearing sleeve and the lower bearing sleeve, and the oil flows into the oil return groove and the oil outlet hole opened on the base. Oil storage cavities are opened on the upper bearing sleeve and the lower bearing sleeve. There is a certain gap between the static pressure shaft and the upper bearing sleeve and the lower bearing sleeve. Under the action of the static pressure oil, a pressure oil film is formed between the static pressure shaft and the upper bearing sleeve and the lower bearing sleeve.

[0013] Further, the transfer piece includes a transfer flange and a transmission key;

[0014] The transmission key is located in the installation groove provided at the top end of the motor shaft and is fixed to the motor shaft by screws; the transfer flange is fixed to the top end of the motor shaft by screws; there is a gap between the top surface of the transmission key and the bottom surface of the transfer flange; the transmission key is in interference fit with the motor shaft and the transfer flange in the circumferential direction.

[0015] Further, the heat-insulating shaft is divided into an upper heat-insulating shaft, a middle heat-insulating shaft and a lower heat-insulating shaft; the upper heat-insulating shaft and the lower heat-insulating shaft are made of stainless steel, and the middle heat-insulating shaft is made of ceramic;

[0016] A number of axial through holes are provided on the middle heat-insulating shaft for directly connecting the upper heat-insulating shaft, the middle heat-insulating shaft and the lower heat-insulating shaft together by screws; the upper heat-insulating shaft is connected to the workbench by screws, and the lower heat-insulating shaft is connected to the transfer flange by screws;

[0017] The upper heat-insulating shaft, the middle heat-insulating shaft and the lower heat-insulating shaft are all cylindrical. The lower heat-insulating shaft is provided with a wire groove, and a closed partition is provided at the center inside the lower heat-insulating shaft.

[0018] Furthermore, it also includes a water baffle, a protective cover and a felt.

[0019] The water baffle is arranged on the outer circumference of the lower heat-insulating shaft. The protective cover is fixed on the upper end face of the bearing seat and is located below the water baffle. The felt is arranged on the upper and lower end faces of the matching part between the bottom plate of the high and low temperature box and the heat-insulating shaft.

[0020] Furthermore, it also includes leveling feet, which are fixed at the bottom of the base.

[0021] Furthermore, a number of reinforcing ribs are provided on the base.

[0022] Furthermore, the temperature range of the high and low temperature box is -55°C to +85°C, and the angular frequency is above 200 Hz.

[0023] Beneficial effects:

[0024] 1. The present invention changes the layout of the motor and the bearing, optimizes the traditional bearing arranged on the motor to the motor arranged inside the bearing, reduces the overall height of the device, increases its stiffness and strength, and at the same time provides a high and low temperature environment, enabling high-frequency angular vibration in the high and low temperature environment. It can be applied to the calibration of inertial devices under high and low temperature and high-frequency angular vibration conditions, providing key support for the accurate calibration of inertial devices under high and low temperature conditions, thereby further improving the performance and environmental adaptability of inertial devices and meeting the requirements of rapid launch and high-precision navigation of missile weapons.

[0025] Secondly, in the present invention, the motor stator is fixedly connected to the base, and the motor rotor is directly connected to the motor shaft, with no transmission gap in the middle, which guarantees the high precision of the system.

[0026] 2. In the present invention, under the action of the static pressure oil, a certain pressure oil film is formed between the static pressure shaft and the upper bearing sleeve and the lower bearing sleeve. Driven by the torque motor, the rotating part of the shafting rotates smoothly. The liquid static pressure bearing is used as the support of the rotating shafting, and through the full design of the oil supply and oil return system for the liquid static pressure bearing, high-frequency angular vibration is achieved under large load conditions.

[0027] 3. The present invention designs a water baffle, a protective cover and a felt, and sets a wire groove on the lower heat-insulating shaft, with static and dynamic sealing, low-temperature heating, and a special wire routing waterproof structure, which can effectively prevent the condensed water generated in the temperature box during high and low temperature operation from entering the lower shafting.

[0028] 4. A number of reinforcing ribs are provided on the base of the present invention to improve the strength and stiffness of the device to ensure the overall stability of the system, and finite element software simulation verification is carried out to ensure that the natural frequency of the system is high enough. Brief Description of the Drawings

[0029] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention.

[0030] Figure 2 This is a sectional view of the high-frequency angular vibration table.

[0031] Figure 3 This is a three-dimensional schematic diagram of the intermediate heat-insulating shaft.

[0032] Among them, 1 - leveling foot; 2 - base; 3 - bearing seat; 4 - lower bearing sleeve; 5 - hydrostatic shaft; 6 - upper bearing sleeve; 7 - protective cover; 8 - lower heat-insulating shaft; 9 - high and low temperature box; 10 - intermediate heat-insulating shaft; 11 - upper heat-insulating shaft; 12 - workbench; 13 - adapter flange; 14 - driving key; 15 - motor shaft; 16 - torque motor; 17 - conductive slip ring; 18 - encoder, 19 - high-frequency angular vibration table. Detailed Embodiment

[0033] The present invention will be described in detail below with reference to the accompanying drawings and by way of examples.

[0034] The present invention provides a high and low temperature high-frequency angular vibration device based on a hydrostatic shafting system, as Figure 1 shown, including a high-frequency angular vibration table 19, a high and low temperature box 9 and a control system. The high and low temperature box 9 provides a temperature environment for the product to be measured, and the control system controls the temperature of the high and low temperature box 9 and the angular frequency, angular velocity and angular position of the high-frequency angular vibration table 19, and can realize the calibration function under the comprehensive environment of the operating temperature of -55°C to +85°C and the angular vibration frequency above 200 Hz.

[0035] The high-frequency angular vibration table 19 is of a vertical structure, including a base 2, a hydrostatic bearing, a torque motor 16, an adapter, an encoder 18, a conductive slip ring 17, a heat-insulating shaft 10 and a workbench 12. The workbench 12 of the high-frequency angular vibration table 19 is completely placed inside the high and low temperature box 9, and other structural parts of the high-frequency angular vibration table 19 are outside the temperature box.

[0036] As Figure 2 shown, the base 2 is located at the bottom, and a number of reinforcing ribs are provided on the base 2 to ensure the overall stability of the system. The stator of the torque motor 16 is fixedly connected to the base 2 and is located inside the base 2. The rotor of the torque motor 16 is connected to the internal motor shaft 15. The hydrostatic bearing is located on the outer circumference of the base 2, and the top of the motor shaft 15 is fixedly connected to the hydrostatic bearing through an adapter; an encoder 18 is provided at the bottom shaft end of the motor shaft 15, and the conductive slip ring 17 is installed on the encoder 18. The encoder 18 is used as the feedback of the angular position and angular velocity of the rotating part; the top of the adapter is connected to the workbench 12 located inside the high and low temperature box 9 through a heat-insulating shaft.

[0037] Specifically, the hydrostatic bearing includes a bearing housing 3, an upper bearing sleeve 6, a hydrostatic shaft 5, and a lower bearing sleeve 4;

[0038] The hydrostatic shaft 5 is hollow inside and has a shaft shoulder in the middle of its outer circumference. The upper bearing sleeve 6 and the lower bearing sleeve 4 are respectively sleeved on the outer circumference of the hydrostatic shaft 5 and are respectively located above and below the shaft shoulder. The shaft shoulder cooperates with the upper bearing sleeve 6 and the lower bearing sleeve 4 to form a thrust surface. At the same time, the upper bearing sleeve 6 and the lower bearing sleeve 4 are both fixed in the bearing housing 3;

[0039] The bearing housing 3 is provided with an oil inlet hole. Oil grooves are opened in the bearing housing 3, the upper bearing sleeve 6, and the lower bearing sleeve 4, and the oil flows correspondingly into the oil return groove and the oil outlet hole opened on the base 2. Oil storage cavities are opened on the upper bearing sleeve 6 and the lower bearing sleeve 4. There is a certain gap between the hydrostatic shaft 5 and the upper bearing sleeve 6 and the lower bearing sleeve 4. Under the action of the hydrostatic oil, a pressure oil film is formed between the hydrostatic shaft 5 and the upper bearing sleeve 6 and the lower bearing sleeve 4.

[0040] The adapter includes an adapter flange 13 and a transmission key 14. The transmission key 14 is located in the installation groove provided at the top of the motor shaft 15 and is fixed to the motor shaft 15 by screws; the adapter flange 13 is fixed to the top of the motor shaft 15 by screws; there is a gap between the top surface of the transmission key 14 and the bottom surface of the adapter flange 13; the transmission key 14 is in interference fit with the motor shaft 15 and the adapter flange 13 in the circumferential direction.

[0041] The heat-insulating shaft is divided into an upper heat-insulating shaft 11, a middle heat-insulating shaft 10, and a lower heat-insulating shaft 8; as Figure 3 shown, a number of axial through holes are provided on the middle heat-insulating shaft 10 for directly connecting the upper heat-insulating shaft 11, the middle heat-insulating shaft 10, and the lower heat-insulating shaft 8 together by screws. The upper heat-insulating shaft 11 and the lower heat-insulating shaft 8 are made of stainless steel, which has good rigidity and is convenient for processing. The middle heat-insulating shaft 10 is made of ceramic, which has good heat-insulating performance. The upper heat-insulating shaft 11 is connected to the workbench 12 by screws, and the lower heat-insulating shaft 8 is connected to the adapter flange 13 by screws.

[0042] The upper heat-insulating shaft 11, the middle heat-insulating shaft 10, and the lower heat-insulating shaft 8 are all cylindrical. The lower heat-insulating shaft 8 is provided with a wire groove, and a closed partition is provided at the center inside the lower heat-insulating shaft 8 to prevent condensed water from flowing downward.

[0043] The product to be measured is placed on the workbench 12. The cable of the product to be measured passes through the inside of the upper heat-insulating shaft 11, the middle heat-insulating shaft 10, the upper part inside the lower heat-insulating shaft 8, and the wire groove on the lower heat-insulating shaft 8, and is electrically connected to the cable of the conductive slip ring 17 through a aviation plug inside the protective cover 7.

[0044] To prevent the condensed water generated in the incubator during high and low temperature operation from entering the shafting below, the present invention also makes a sealed waterproof design. The high and low temperature high-frequency angular vibration device further includes a water baffle, a protective cover 7 and felt. The water baffle is arranged on the outer circumference of the lower heat-insulating shaft 8, and the protective cover 7 is fixed on the upper end face of the bearing seat 3 and located below the water baffle; the felt is arranged on the upper and lower end faces of the mating part between the bottom plate of the high and low temperature box 9 and the heat-insulating shaft. Specifically, an annular groove is provided on the outer circumference of the lower heat-insulating shaft 8, and the water baffle is made of polytetrafluoroethylene and is clamped in the annular groove of the lower heat-insulating shaft 8 by utilizing the deformation characteristics of its material.

[0045] As an improvement, the high and low temperature high-frequency angular vibration device further includes a leveling foot 1, which is fixed to the bottom of the base 2 and is used for equipment level adjustment.

[0046] A detachable drawer is provided on the bottom plate of the high and low temperature box 9, which is convenient for installing the high-frequency angular vibration table 19. When the detachable drawer is removed, the high-frequency angular vibration table 19 is moved in from the side, the middle heat-insulating shaft 10 enters the disassembly space on the bottom plate, the workbench 12 is located above the bottom plate, and then the detachable drawer is installed.

[0047] During specific installation, (1) Install the lower bearing sleeve 4 on the bearing seat 3 through screws, place the hydrostatic shaft 5 on the lower bearing sleeve 4, install the upper bearing sleeve 6 on the bearing seat 3, and take them as a component, that is, a hydrostatic bearing.

[0048] (2) Place the base 2 on the leveling foot 1, first fix the stator of the torque motor 16 on the base 2, and then fix the hydrostatic bearing on the base 2 through screws.

[0049] (3) Fix the transmission key 14 in the groove of the motor shaft 15 through axial screws, and then fix the adapter flange 13 to the motor shaft 15 through screws (not shown in the figure). The transmission key 14 and the motor shaft 15 and the adapter flange 13 are in interference fit in the circumferential direction. To ensure dimensional tolerances and form and position errors, these three parts are machined together after assembly and taken as a component, that is, the main shaft.

[0050] (4) Install the rotor of the torque motor 16 on the main shaft, and then fix them together to the upper bearing sleeve 6.

[0051] (5) Install the encoder 18 on the motor shaft 15, and then install the conductive slip ring 17 on the encoder 18.

[0052] (6) Install the lower heat-insulating shaft 8 on the adapter flange 13, fix the protective cover 7 on the bearing seat 3, and then fix the middle heat-insulating shaft 10, the upper heat-insulating shaft 11, and the workbench 12 through screws in sequence. Thus, the installation of the high-frequency angular vibration table 19 is completed.

[0053] After removing the detachable drawer on the high and low temperature chamber 9, move the high-frequency angular vibration table 19 to the bottom of the high and low temperature chamber 9, install the detachable drawer and seal it well.

[0054] In summary, the above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high and low temperature high frequency angular vibration device based on a hydrostatic bearing system, characterized in that It includes a high-frequency angular vibration table, a high and low temperature chamber and a control system. The high-frequency angular vibration table includes a base, a hydrostatic bearing, a torque motor, a transfer piece, an encoder, a conductive slip ring, a heat-insulating shaft and a workbench; The base is located at the bottom. The stator of the torque motor is fixedly connected to the base and located inside the base. The rotor of the torque motor is connected to the internal motor shaft. The hydrostatic bearing is located on the outer circumference of the base, and the top of the motor shaft is fixedly connected to the hydrostatic bearing through a transfer piece. An encoder is provided at the bottom shaft end of the motor shaft, and the conductive slip ring is installed on the encoder. The top of the transfer piece is connected to the workbench located inside the high and low temperature chamber through a heat-insulating shaft. The control system controls the temperature of the high and low temperature chamber and the angular frequency, angular velocity and angular position of the high-frequency angular vibration table.

2. The high and low temperature high frequency angular vibration device based on a hydrostatic bearing system according to claim 1, wherein The hydrostatic bearing includes a bearing seat, an upper bearing sleeve, a static pressure shaft and a lower bearing sleeve; The static pressure shaft is hollow inside and has a shaft shoulder in the middle of its outer circumference. The upper bearing sleeve and the lower bearing sleeve are respectively sleeved on the outer circumference of the static pressure shaft and are respectively located above and below the shaft shoulder. At the same time, the upper bearing sleeve and the lower bearing sleeve are both fixed in the bearing seat; The bearing seat is provided with an oil inlet hole. Oil grooves are opened in the bearing seat, the upper bearing sleeve and the lower bearing sleeve, and the oil flows into the oil return groove and the oil outlet hole opened on the base correspondingly. Oil storage cavities are opened on the upper bearing sleeve and the lower bearing sleeve. There is a certain gap between the static pressure shaft and the upper bearing sleeve and the lower bearing sleeve. Under the action of the static pressure oil, a pressure oil film is formed between the static pressure shaft and the upper bearing sleeve and the lower bearing sleeve.

3. The high and low temperature high frequency angular vibration device based on a hydrostatic shafting according to claim 1, characterized in that, The transfer piece includes a transfer flange and a transmission key; The transmission key is located in the installation groove provided at the top end of the motor shaft and is fixed to the motor shaft by screws; the transfer flange is fixed to the top end of the motor shaft by screws; there is a gap between the top surface of the transmission key and the bottom surface of the transfer flange; the transmission key is in interference fit with the motor shaft and the transfer flange in the circumferential direction.

4. The high and low temperature and high frequency angular vibration device based on a hydrostatic shafting according to claim 3, characterized in that, The heat-insulating shaft is divided into an upper heat-insulating shaft, a middle heat-insulating shaft and a lower heat-insulating shaft; the upper heat-insulating shaft and the lower heat-insulating shaft are made of stainless steel, and the middle heat-insulating shaft is made of ceramic; A number of axial through holes are provided on the middle heat-insulating shaft for directly connecting the upper heat-insulating shaft, the middle heat-insulating shaft and the lower heat-insulating shaft together by screws; the upper heat-insulating shaft is connected to the workbench by screws, and the lower heat-insulating shaft is connected to the transfer flange by screws; The upper heat-insulating shaft, the middle heat-insulating shaft and the lower heat-insulating shaft are all cylindrical. The lower heat-insulating shaft is provided with a wire groove, and a closed partition is provided at the center inside the lower heat-insulating shaft.

5. The high and low temperature high frequency angular vibration device based on a hydrostatic bearing system according to claim 4, characterized in that, It also includes a water baffle, a protective cover and a felt; The water baffle is arranged on the outer circumference of the lower heat-insulating shaft, and the protective cover is fixed on the upper end face of the bearing seat and is located below the water baffle; the felt is arranged on the upper and lower end faces of the matching part between the bottom plate of the high and low temperature chamber and the heat-insulating shaft.

6. The high and low temperature high frequency angular vibration device based on a hydrostatic shafting according to any one of claims 1-5, characterized in that, It also includes leveling feet, which are fixed to the bottom of the base.

7. The high and low temperature high frequency angular vibration device based on a hydrostatic bearing system according to any one of claims 1-5, characterized in that, A number of reinforcing ribs are provided on the base.

8. The high and low temperature high frequency angular vibration device based on a hydrostatic bearing system according to claim 7, characterized in that, The temperature range of the high and low temperature chamber is -55°C to +85°C, and the angular frequency is above 200 Hz.

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