High-precision anti-glare actuator

Abstract

This invention relates to the field of electro-hydraulic actuator technology, specifically a high-precision anti-glare actuator, comprising an actuator cylinder, an actuator piston, a drive cylinder, a drive piston, a coil, a GMM rod, a preload cylinder, a bracket, a cold oil tank, an inlet valve, an outlet valve, and an oil pump. The preload cylinder is located below the drive cylinder and includes a limiting chamber and a buffer chamber from top to bottom. The bracket is located inside the buffer chamber, with its upper end face abutting against the lower end face of the GMM rod. The cold oil tank is located outside the preload cylinder. The inlet valve and outlet valve are located in the buffer chamber and the limiting chamber, respectively. The oil pump is installed between the inlet valve and the cold oil tank. This invention achieves rapid heat dissipation of the GMM rod by accelerating oil exchange during the GMM rod retraction process and changing the preload position and filtering oil impurities through oil exchange, thereby improving the actuator's precision and ensuring the long-term stability of the GMM rod, thus enhancing the actuator's anti-glare performance.

Description

Technical Field

[0001] This invention relates to the field of electro-hydraulic actuator technology, specifically a high-precision anti-glare actuator. Background Technology

[0002] An electro-hydraulic actuator is a high-pressure, high-flow hydraulic component. Its working principle is as follows: The GMM rod, the core component of the electro-hydraulic actuator, extends axially under the influence of the coil's magnetic field, thereby compressing the oil in the pump chamber where the GMM rod is located. This causes the piston to push the push rod under hydraulic pressure, precisely outputting large power to the outside world to stably control the minute displacements of heavy-duty equipment (such as controlling the deflection angle of a helicopter propeller). During this process, the GMM rod, limited by its material properties, has a much lower tensile strength than compressive strength, and its elongation is significantly affected by external forces. Therefore, accurate preload must be provided to the GMM rod to avoid structural damage and reduced accuracy. However, traditional actuators cannot provide accurate preload values. Therefore, during long-term operation, the GMM rod is prone to unstable elongation, which in turn affects the actuator's accuracy.

[0003] To address the aforementioned issues, existing technologies have proposed several solutions. For instance, in an actuator with patent number CN105003494B, the pre-pressure on the GMM rod is detected in real time using a built-in sensor, and the pre-pressure is adjusted accordingly based on the detection data. This stabilizes the elongation performance of the GMM rod under the drive of the coil magnetic field, thereby improving the accuracy of the actuator.

[0004] Even so, existing actuators still have some shortcomings for the following reasons: During the operation of the electro-hydraulic actuator, the GMM rod is compressed by the coil's magnetic field, causing the pump chamber oil to be compressed. However, at the same time, due to electromagnetic induction, eddy currents are generated in the GMM rod, causing its temperature to rise rapidly. When the coil's magnetic field is removed, the GMM rod should retract according to the preset recovery characteristics to reset the actuator's push rod. However, because the GMM rod's temperature is too high at this time, the physical properties of the material change to some extent, limiting the retraction length. This directly affects the starting position and extension amount of the actuator's push rod in the next extension process, thus negatively impacting the actuator's accuracy.

[0005] To address this, a high-precision anti-glare actuator is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a high-precision anti-glare actuator that solves the problem of insufficient heat dissipation efficiency of the GMM rod, which affects its retraction and thus reduces output accuracy. By accelerating oil exchange during the retraction of the GMM rod and changing the pre-pressure position and filtering oil impurities through oil exchange, the GMM rod can be cooled quickly, thereby improving the actuator's accuracy. It also has the effect of maintaining the stability of the GMM rod for a long time, thus improving the actuator's anti-glare performance.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A high-precision anti-glare actuator includes an actuator cylinder, an actuator piston, a drive cylinder, a drive piston, a coil, and a GMM rod. The actuator piston is installed inside the actuator cylinder, the drive cylinder is located below the actuator cylinder, the drive piston is installed inside the drive cylinder, and the upper end face of the GMM rod abuts against the drive piston. It also includes a pre-compression cylinder, a bracket, a cold oil tank, an inlet valve, an outlet valve, and an oil pump. The pre-compression cylinder is located below the drive cylinder and includes a limiting cavity and a buffer cavity from top to bottom. The bracket is located inside the buffer cavity, and the upper end face of the bracket abuts against the lower end face of the GMM rod. The cold oil tank is located outside the pre-compression cylinder. The inlet valve and the outlet valve are located in the buffer cavity and the limiting cavity, respectively. The oil pump is installed between the inlet valve and the cold oil tank.

[0009] The oil inlet valve is open and the oil outlet valve is closed, providing pre-pressure to the GMM rod under the action of the oil pump. The oil inlet valve and the oil outlet valve are both closed to maintain a constant oil pressure inside the pre-pressure cylinder. The oil inlet valve and the oil outlet valve are both open to circulate the oil under the action of the oil pump.

[0010] Preferably, the limiting cavity is provided with a circulation channel, and the circulation channel is configured with a spiral structure;

[0011] In the above scheme, the spiral circulation channel is set to achieve directional flow of oil in the pre-compression cylinder, thereby enhancing the cooling effect on the GMM rod.

[0012] The elongation performance of the GMM rod is sensitively related to the magnetic field strength provided by the coil. During operation, the circumferential surface of the GMM rod must not have defects, nor can it be installed or contact other objects. Therefore, a gap is left between the GMM rod and the limiting cavity to form an oil film lubrication, thereby avoiding the limitation on the elongation performance of the GMM rod.

[0013] Actuators are commonly used in helicopters or various vehicles, so to improve driving safety, their anti-glare performance is a key testing standard when they are installed in the open. The consideration of anti-glare performance is mainly from two aspects: the material itself and vibration damping. In terms of material, various surface treatment processes can be carried out, such as ultra-black surface treatment. In terms of vibration damping, due to the oil film lubrication of GMM rods, there is a large runout space, so vibration damping treatment for GMM rods is very necessary.

[0014] Preferably, the thickness of the circulation channel increases from top to bottom, and the material constituting the circulation channel contains bronze particles.

[0015] In the above scheme, the longer the length of the oil film (i.e., the thickness of the circulating channel in this scheme), the better its damping effect, and correspondingly, the GMM rod is more stable. However, as the thickness of the circulating channel increases, its heat dissipation performance will decrease, thereby reducing the heat dissipation efficiency of the GMM rod. Therefore, this scheme sets the thickness of the circulating channel to be gradually varying. The advantage of making the lower part thicker is that during the operation of the actuator, the heat is mainly generated by the eddy currents formed by the GMM rod under the action of the coil magnetic field. Moreover, there is a tendency for cold oil to be below hot oil in the oil. Therefore, the oil temperature in the buffer chamber below the limiting cavity is lower. Thus, the thicker part with poor heat dissipation capacity and excellent damping performance is located below the circulating channel. Bronze particles have excellent thermal conductivity, and their addition further promotes the heat dissipation performance of the circulating channel from the material itself.

[0016] It is known that in order to provide axial preload to the GMM rod in the preload cylinder, it is necessary to ensure that the pressure of the oil in the preload cylinder on the upper end of the GMM rod is less than the pressure on the lower end. Therefore, the upper end of the GMM rod will be in complete contact with the drive piston to avoid bearing the pressure of the oil in the preload cylinder. As for the lower end of the GMM rod, there are many installation methods, such as using a ring to support the GMM rod, or using a circular plate with an outer diameter smaller than the outer diameter of the GMM rod. Compared with this solution, the above solutions all have the phenomenon of unstable support for the GMM rod, which in turn affects the anti-glare performance of the actuator.

[0017] Preferably, the support includes a support column, a support plate, and a sliding blade. The support column is connected to the inner bottom surface of the buffer cavity, the support plate is fixed to the upper end surface of the support column, and the outer diameter of the support plate is not less than the outer diameter of the GMM rod. The sliding blade is rotatably connected to the support column and is located below the support plate. The support plate has pre-compression holes arranged in a circumferential array.

[0018] In the above scheme, the overall area of ​​the support plate is made as large as possible to form a stable support for the GMM rod, and the pre-pressure holes in the circumferential array on the support plate provide uniform pressure to the lower end face of the support plate.

[0019] Preferably, the blade includes a ring and a blade, the blade is configured as a fan-shaped structure, the ring is rotatably connected to the support, and multiple blades are arrayed at equal angles on the ring;

[0020] In the above scheme, by rotating the ring around the support, the contact position between the upper end face of the blade and the lower end face of the support plate changes. This changes the unobstructed pre-compression holes on the support plate each time pre-compression is applied. Furthermore, under the shielding effect of the blades arranged in an equiangular array, the unobstructed pre-compression holes remain symmetrical. As a result, the GMM rod on the support plate can not only be subjected to uniform and stable pre-compression, but its position under pre-compression can also change to avoid prolonged local pressure, thereby enhancing the durability of the GMM rod and improving the working stability of the actuator.

[0021] Preferably, the outer periphery of the leaf portion is provided with fan blades, and the fan blades are provided with filter holes;

[0022] In the above scheme, the oil in the pre-compression cylinder is directed to flow through the circulation channel, which provides rotational power to the fan blades, thereby driving the sliding blades to rotate around the support column. This changes the position of the lower end face of the GMM rod under pre-compression. During the rotation of the fan blades, impurities in the oil can be collected through their own filter holes to maintain the purity of the oil film between the GMM rod and the circulation channel, thereby improving the stability of the GMM rod during elongation.

[0023] Preferably, the support column includes side columns and a central column, with a plurality of side columns arranged in a circumferential array around the outer periphery of the support plate, and the central column inserted below the support plate, and the central column being rotatably connected to the ring portion;

[0024] In the above scheme, the side columns provide substantial support to the support plate, and the central column rotates to connect the sliding blades. The advantages of this arrangement are: 1) It provides sufficient space for the rotation of the fan blades, so that the oil has a stronger force on the fan blades and the fan blades can filter oil impurities better; 2) The central column does not need to be connected to the inner bottom surface of the buffer chamber, thus providing space for the installation of the oil inlet valve.

[0025] Preferably, the oil inlet valve is located on the lower wall of the buffer chamber and directly below the central column, and the oil outlet valve is located on the side wall of the limiting chamber and directly opposite the upper port of the circulation channel.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. This invention utilizes a spiral circulation channel to allow the oil inside the preload cylinder to flow rapidly and directionally, enabling the GMM rod to dissipate heat effectively and quickly during oil flow. This allows the actuator to retract rapidly after the magnetic field is removed, ensuring the actuator's high precision. Furthermore, the circulation channel provides rotational power to the sliding vanes on the support, changing the position of the preload on the lower end face of the GMM rod through vane rotation. This ensures uniform pressure on all parts of the lower end face of the GMM rod, enhancing its durability. Additionally, the vanes filter impurities in the oil during rotation, resulting in a purer lubricating oil film on the GMM rod, improving its stability and thus enhancing the actuator's anti-glare performance.

[0028] 2. This invention utilizes the gradient variation of the circulation channel to ensure the length of the lubricating oil film between itself and the GMM rod through the large thickness section, thereby improving the damping effect of the oil film and making the GMM rod more stable, thus improving the anti-glare performance of the actuator. At the same time, the small thickness section improves its own thermal conductivity, making it easier for the heat of the GMM rod to be discharged, thereby improving the accuracy of the actuator. Furthermore, the thickness of the circulation channel increases from top to bottom, so that the thicker part comes into contact with the cooler oil in the buffer cavity, thereby reducing the adverse effect of the thicker part on the heat dissipation effect of the GMM rod.

[0029] 3. This invention uses a fixed support plate and rotating slide vanes as the support. The large-area support plate provides stable support for the GMM rod, and the pre-compression holes arranged in a circular array on the support plate pre-compression the lower end face of the GMM rod. The slide vanes, rotating under the action of the circulation channel, cover the pre-compression holes on the support plate, ensuring that the lower end face of the GMM rod is pre-compressed at different positions each time, thereby enhancing the durability of the GMM rod. Furthermore, the equidistant arrangement of multiple slide vanes ensures that the position of the unobstructed pre-compression holes on the support plate is always symmetrical about the diameter of the support plate, guaranteeing the stability of the GMM rod during pre-compression and subsequent elongation. In addition, the filter holes on the vane blades effectively absorb impurities in the oil in the pre-compression cylinder, ensuring the purity of the lubricating oil film between the GMM rod and the circulation channel, thus making the GMM rod more stable during elongation and improving the anti-glare performance of the actuator. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall isometric structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the overall internal section isometric structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the overall internal cross-section front view of the present invention;

[0033] Figure 4 For the present invention Figure 3Enlarged diagram of part A in the middle;

[0034] Figure 5 This is a schematic diagram of the front right isometric structure of the bracket of the present invention;

[0035] Figure 6 This is a schematic diagram of the rear right isometric structure of the bracket of the present invention;

[0036] Figure 7 For the present invention Figure 3 Enlarged diagram of section B;

[0037] Figure 8 For the present invention Figure 3 Enlarged diagram of section C.

[0038] In the diagram: 1. Actuating cylinder; 2. Actuating piston; 3. Drive cylinder; 4. Drive piston; 5. Coil; 6. GMM rod; 7. Preload cylinder; 71. Limiting cavity; 711. Circulation channel; 72. Buffer cavity; 8. Bracket; 81. Support column; 811. Side column; 812. Middle column; 82. Support plate; 821. Preload hole; 83. Sliding vane; 831. Ring part; 832. Blade part; 8321. Fan blade; 8322. Filter hole; 9. Cold oil tank; 10. Oil inlet valve; 11. Oil outlet valve; 12. Oil pump. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please see Figures 1 to 8 This invention provides a high-precision anti-glare actuator, the technical solution of which is as follows:

[0041] A high-precision anti-glare actuator includes an actuator cylinder 1, an actuator piston 2, a drive cylinder 3, a drive piston 4, a coil 5, a GMM rod 6, a preload cylinder 7, a bracket 8, a cold oil tank 9, an oil inlet valve 10, an oil outlet valve 11, and an oil pump 12. The actuator piston 2 is installed inside the actuator cylinder 1. The drive cylinder 3 is located below the actuator cylinder 1, and the drive piston 4 is installed inside the drive cylinder 3. The upper end face of the GMM rod 6 abuts against the drive piston 4. The preload cylinder 7 is located below the drive cylinder 3, and its interior includes a limiting cavity 71 and a buffer cavity 72 from top to bottom. The coil 5 is placed in a groove outside the limiting cavity 71. The bracket 8 is located inside the buffer cavity 72, and its upper end face abuts against the lower end face of the GMM rod 6. The cold oil tank 9 is located outside the preload cylinder 7. The oil inlet valve 10 and the oil outlet valve 11 are located in the buffer cavity 72 and the limiting cavity 71, respectively. The oil pump 12 is installed between the oil inlet valve 10 and the cold oil tank 9. Figure 1 , Figure 2 and Figure 3 The inlet valve 10, oil pump 12, cold oil tank 9, and outlet valve 11 are connected in series via oil pipes. During operation: 1) When the inlet valve 10 is open and the outlet valve 11 is closed, the oil pump 12 draws oil from the cold oil tank 9 and pumps it into the pre-pressure cylinder 7, thereby continuously increasing the oil pressure inside the pre-pressure cylinder 7 until the oil pressure value on the inlet valve 10 side of the oil pump 12 reaches the pre-pressure value; 2) When both the inlet valve 10 and the outlet valve 11 are closed, the oil pump 12 stops running, thereby maintaining the oil pressure inside the pre-pressure cylinder 7; 3) When both the inlet valve 10 and the outlet valve 11 are open, the oil pump 12 pumps oil from the cold oil tank 9 into the pre-pressure cylinder 7, thereby circulating the oil inside the pre-pressure cylinder 7 to rapidly cool the GMM rod 6; furthermore, to improve the cooling efficiency of the GMM rod 6 during oil circulation, cooling facilities such as water cooling and air cooling can be arranged on the outside of the cold oil tank 9; the oil flow path is as follows: Figure 3 As indicated by the middle arrow.

[0042] As one embodiment of the present invention, refer to Figure 3 The limiting cavity 71 is equipped with a circulating channel 711, which is a spiral structure. The circulating channel 711 is fixed to the inner wall of the limiting cavity 71. There are two manufacturing methods for the combination of the circulating channel 711 and the pre-compression cylinder 7: one is to process the tube internally to mill or bore the circulating channel 711; the other is to process the pre-compression cylinder 7 and the circulating channel 711 separately and then connect them (different connection methods are used depending on the material, such as welding, gluing, etc.). Of these two production methods, the former has a higher production cost, but the surface of the integrally manufactured workpiece is smooth and has fewer defects, so the guiding effect of the oil is better, and the heat dissipation effect of the GMM rod 6 is more obvious. The latter has a lower production cost, but the heat dissipation effect is inferior to the former. In actual production, the processing method can be selected according to the actual needs.

[0043] As one embodiment of the present invention, refer to Figure 4 The thickness of the circulation channel 711 increases from top to bottom, and the material of the circulation channel 711 contains bronze particles. In this method, the thicknesses of the three adjacent spirals of the circulation channel 711 from bottom to top are denoted as d1, d2, and d3, respectively, and their order is: d1 > d2 > d3. The portion of the circulation channel 711 with a thickness of d1 forms a relatively long lubricating oil film with the GMM rod 6, thereby enhancing the damping effect of this oil film and ensuring the high stability of the GMM rod 6 during elongation and retraction, thus improving the anti-glare effect of the actuator. The circulating channel 711, with a thickness of d1, is adjacent to the buffer cavity 72. Through heat exchange with the low-temperature oil inside the buffer cavity 72, it can keep its own temperature at a low level, thereby reducing the limitation of its own thickness on thermal conductivity and improving the overall heat dissipation effect of the GMM rod 6, thus making the actuator more accurate. As for the specific values ​​of d1, d2 and d3, they need to refer to the axial length of the GMM rod 6. In this method, the axial length of the GMM rod 6 is 150mm, so d1 is 8mm, d2 is 6.5mm and d3 is 5mm.

[0044] Regarding the manufacturing materials, based on the two manufacturing methods mentioned above, there are two different material combinations, as follows: If the circulation channel 711 and the pre-pressure cylinder 7 are manufactured separately, in order to further improve the heat dissipation efficiency of the GMM rod 6, the circulation channel 711 is mainly composed of epoxy resin-based composite material, and spherical bronze particles with a volume ratio of 20% to 30% and an average particle size of 10 to 20 micrometers are added, and then it is made by molding process; if it is manufactured as a whole, bronze particles are sprayed on the surface of the formed circulation channel 711.

[0045] As one embodiment of the present invention, refer to Figure 5 and Figure 6 The support 8 includes a support column 81, a support plate 82, and a sliding blade 83. The support column 81 is connected to the inner bottom surface of the buffer cavity 72. The support plate 82 is fixed to the upper end surface of the support column 81, and the outer diameter of the support plate 82 is not less than the outer diameter of the GMM rod 6. The sliding blade 83 is rotatably connected to the support column 81, and the sliding blade 83 is located below the support plate 82. The support plate 82 has a pre-compression hole 821 arranged in a circumferential array.

[0046] As one embodiment of the present invention, refer to Figure 6The sliding blade 83 includes a ring portion 831 and a blade portion 832. The blade portion 832 is configured as a fan-shaped structure. The ring portion 831 is rotatably connected to the support column 81. Multiple blade portions 832 are arranged at equal angles on the ring portion 831. The upper end face of the blade portion 832 is in close contact with the lower end face of the support plate 82. (When the pressure inside the pre-pressure cylinder 7 is high, since the upper end face of the blade portion 832 is not in contact with the oil, the pressure on the lower end face of the blade portion 832 will cause the blade portion 832 to have an upward tendency, thereby causing the blade portion 832 to automatically stick to the support plate 82. Correspondingly, during oil circulation (i.e., when the GMM rod 6 loses its magnetic field and begins to return), After retraction, the GMM rod 6 needs to dissipate heat quickly to ensure output accuracy when it extends again. The internal pressure of the preload cylinder 7 decreases, and the tightness effect also weakens accordingly, thereby reducing the relative friction between the support plate 82 and the blade 832 to promote the rotation of the blade 832. This prevents oil from seeping in when the blade 832 covers the preload hole 821, thus avoiding the preload formed by the covered preload hole 821 on the lower end face of the GMM rod 6. In addition, to further promote the rotation of the blade 832, the upper end face of the blade 832 and the lower end face of the support plate 82 are surface treated to reduce the coefficient of friction.

[0047] As one embodiment of the present invention, refer to Figure 5 and Figure 6 The outer periphery of the blade 832 is provided with fan blades 8321, and the fan blades 8321 are provided with filter holes 8322. In this method, multiple vertically inclined fan blades 8321 are provided on the outer periphery of each blade 832. The inclination angle of the fan blades 8321 can be selected between 15° and 25° to convert the thrust of the oil circulation into the power of the rotation of the blade 832. The filter holes 8322 are provided on the fan blades 8321 to adsorb impurities in the oil, thereby ensuring the purity of the oil film between the GMM rod 6 and the circulation channel 711, thereby improving the stability of the GMM rod 6 and improving the anti-glare performance of the actuator. In the attached figure, the filter holes 8322 are enlarged for easy display. In actual production, porous materials can be directly selected to manufacture the fan blades 8321.

[0048] As one embodiment of the present invention, refer to Figure 6 The support column 81 includes side columns 811 and a central column 812. Multiple side columns 811 are arranged in a circular array around the outer periphery of the support plate 82, providing substantial support to the support plate 82. To ensure the stability of the side columns 811 under high pressure inside the pre-compression cylinder 7, the lower ends of the side columns 811 are welded to the inner bottom of the pre-compression cylinder 7. The central column 812 is inserted below the support plate 82, and a bearing is installed between the central column 812 and the ring portion 831 to achieve a rotational connection between the two. In this configuration, to ensure the stability of the sliding blade 83, and thus the stability of the actuator, a method is used... Figure 6 The connector shown fixes the center post 812 to the side post 811.

[0049] As one embodiment of the present invention, refer to Figure 7 and Figure 8 The oil inlet valve 10 is located on the lower wall of the buffer chamber 72 and directly below the central column 812. The oil outlet valve 11 is located on the side wall of the limiting chamber 71 and directly opposite the upper port of the circulation channel 711. In this configuration, the oil inlet valve 10 is positioned directly below the central column 812 so that the oil pumped from the oil inlet valve 10 can make uniform contact with each fan blade 8321, thereby avoiding the phenomenon of the sliding blade 83 shaking due to inconsistent force, thus improving the overall stability of the actuator and improving the anti-glare performance of the actuator. The oil outlet valve 11 is positioned at the upper port of the circulation channel 711, which ensures that the circulation channel 711 fully guides the oil.

[0050] Working Principle: The GMM rod 6 in the actuator elongates under the influence of the magnetic field of coil 5, and heats up due to its own eddy currents. When the magnetic field of coil 5 is removed, the GMM rod 6 retracts, but its retraction length is limited by its own temperature, and this effect is transmitted to the subsequent elongation and retraction process of the GMM rod 6, which is not conducive to the continuous operation of the actuator. To eliminate this effect, this invention aims to enhance the heat dissipation efficiency of the GMM rod 6. Specifically, an oil circulation system is formed by oil pump 12, cold oil tank 9, oil inlet valve 10, oil outlet valve 11, and pre-pressure cylinder 7. After the magnetic field of coil 5 is removed, the oil circulates through this system to reduce the temperature of the GMM rod 6. To further improve the heat dissipation efficiency of the GMM rod 6, the following settings are made:

[0051] A spiral circulation channel 711 is provided between the GMM rod 6 and the limiting cavity 71 to enable rapid and directional movement of the oil, thereby enhancing the cooling effect on the GMM rod 6. The thickness of the circulation channel 711 increases from top to bottom. The larger thickness ensures the length of the lubricating oil film between itself and the GMM rod 6, thereby improving the damping effect of the oil film and making the GMM rod 6 more stable, thus improving the anti-glare performance of the actuator. The smaller thickness increases its own thermal conductivity, making it easier for the heat of the GMM rod 6 to be discharged, thereby improving the accuracy of the actuator. The thicker part also contacts the cooler oil in the buffer cavity 72, thereby reducing the adverse effect of the thicker part on the heat dissipation effect of the GMM rod 6.

[0052] The purity of the oil film between the circulation channel 711 and the GMM rod 6 affects the stability of the GMM rod 6 during its elongation process. Therefore, this invention collects impurities in the oil using a sliding vane 83 rotating on the support column 81, as detailed below:

[0053] The four side posts 811 support the support plate 82, which in turn supports the GMM rod 6 on the support plate 82. At the same time, the central post 812 is inserted into the center of the support plate 82, and the slide 83 is rotatably connected to the central post 812. The slide 83 is driven to rotate by the power provided by the circulation channel 711. Impurities are adsorbed through the filter holes 8322 on the blade 832 to purify the lubricating oil film. Furthermore, the rotation of the slide 83 can change the position of the pre-compression hole 821 on the support plate 82, so that the lower end face of the GMM rod 6 is subjected to different pre-compression pressures in each pre-compression process, thereby avoiding local damage and enhancing the durability of the GMM rod 6 to improve the working stability of the actuator.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-precision anti-glare actuator, comprising an actuator cylinder (1), an actuator piston (2), a drive cylinder (3), a drive piston (4), a coil (5), and a GMM rod (6), wherein the actuator piston (2) is installed inside the actuator cylinder (1), the drive cylinder (3) is located below the actuator cylinder (1), the drive piston (4) is installed inside the drive cylinder (3), and the upper end face of the GMM rod (6) abuts against the drive piston (4), characterized in that: It also includes a pre-compression cylinder (7), a bracket (8), a cold oil tank (9), an oil inlet valve (10), an oil outlet valve (11), and an oil pump (12). The pre-compression cylinder (7) is located below the drive cylinder (3), and the interior of the pre-compression cylinder (7) includes a limiting cavity (71) and a buffer cavity (72) from top to bottom. The bracket (8) is located inside the buffer cavity (72), and the upper end face of the bracket (8) abuts against the lower end face of the GMM rod (6). The cold oil tank (9) is located outside the pre-compression cylinder (7). The oil inlet valve (10) and the oil outlet valve (11) are located in the buffer cavity (72) and the limiting cavity (71), respectively. The oil pump (12) is installed between the oil inlet valve (10) and the cold oil tank (9). The inlet valve (10) is open and the outlet valve (11) is closed, and the oil pump (12) provides pre-pressure to the GMM rod (6). The inlet valve (10) and the outlet valve (11) are both closed to keep the oil pressure inside the pre-pressure cylinder (7) constant. The inlet valve (10) and the outlet valve (11) are both open, and the oil is circulated under the action of the oil pump (12).

2. The high-precision anti-glare actuator according to claim 1, characterized in that: The limiting cavity (71) is provided with a circulation channel (711), which is configured as a spiral structure.

3. A high-precision anti-glare actuator according to claim 2, characterized in that: The thickness of the circulation channel (711) increases from top to bottom, and the material of the circulation channel (711) contains bronze particles.

4. A high-precision anti-glare actuator according to claim 1, characterized in that: The support (8) includes a support column (81), a support plate (82), and a slide (83). The support column (81) is connected to the inner bottom surface of the buffer cavity (72). The support plate (82) is fixed to the upper end surface of the support column (81), and the outer diameter of the support plate (82) is not less than the outer diameter of the GMM rod (6). The slide (83) is rotatably connected to the support column (81), and the slide (83) is located below the support plate (82). The support plate (82) has a pre-pressure hole (821) arranged in a circumferential array.

5. A high-precision anti-glare actuator according to claim 4, characterized in that: The blade (83) includes a ring (831) and a blade (832). The blade (832) is configured as a fan-shaped structure. The ring (831) is rotatably connected to the support (81). Multiple blades (832) are arranged at equal angles on the ring (831).

6. A high-precision anti-glare actuator according to claim 5, characterized in that: The outer periphery of the leaf (832) is provided with a fan blade (8321), and the fan blade (8321) is provided with a filter hole (8322).

7. A high-precision anti-glare actuator according to claim 4, characterized in that: The support column (81) includes side columns (811) and a central column (812). A plurality of side columns (811) are arranged in a circumferential array on the outer periphery of the support plate (82). The central column (812) is inserted below the support plate (82) and is rotatably connected to the ring (831).

8. A high-precision anti-glare actuator according to claim 2, characterized in that: The oil inlet valve (10) is located on the lower wall of the buffer chamber (72) and is located directly below the central column (812). The oil outlet valve (11) is located on the side wall of the limiting chamber (71) and is located directly opposite the upper port of the circulation channel (711).

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