High-precision anti-dazzle actuator

Abstract

The invention relates to the technical field of electro-hydrostatic actuators, in particular to a high-precision anti-dazzle actuator which comprises an execution cylinder, an execution piston, a driving cylinder, a driving piston, a coil, a GMM rod, a pre-pressing cylinder, a support, a cold oil tank, an oil inlet valve, an oil outlet valve and an oil pump. The support is located in the buffering cavity, the upper end face of the support abuts against the lower end face of the GMM rod, the cold oil tank is located outside the prepressing cylinder, the oil inlet valve and the oil outlet valve are located in the buffering cavity and the limiting cavity respectively, and the oil pump is installed between the oil inlet valve and the cold oil tank. According to the invention, by accelerating oil exchange in the retraction process of the GMM rod and changing the pre-pressing position and filtering oil impurities through oil exchange, the purposes of rapidly dissipating heat of the GMM rod and further improving the accuracy of the actuator are achieved, the stability of the GMM rod is kept for a long time, and thus the anti-glare performance of the actuator is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrostatic hydraulic actuators, in particular to a high-precision anti-glare actuator. Background Art

[0002] The electrostatic hydraulic actuator is a high-pressure, high-flow hydraulic component, and its working principle is as follows: the GMM rod, as the core component of the electrostatic hydraulic actuator, extends axially when affected by the magnetic field of the coil, thereby squeezing the oil in the pump chamber where the GMM rod is located, so that the piston pushes the push rod under the drive of the oil pressure to accurately output large power to the outside world, so as to stably control the tiny displacement of heavy-loaded equipment (such as the control of the propeller angle of a helicopter); in the above process, the GMM rod is limited by its own material properties, and its tensile performance is much lower than its compressive performance, and its elongation performance is significantly affected by external forces. Therefore, it is necessary to provide the GMM rod with accurate pre-pressure to avoid damage to the GMM rod structure and reduced accuracy; however, traditional actuators cannot give accurate pre-pressure values. Therefore, during the long-term operation of the actuator, the GMM rod is very likely to have unstable elongation performance, which in turn affects the accuracy of the actuator.

[0003] In order to solve the above problems, the existing technology has proposed some solutions. For example, in an actuator with patent number CN105003494B, the pre-pressure applied to the GMM rod is detected in real time through a built-in sensor, and the corresponding pre-pressure adjustment is made based on the detection data. In this way, the elongation performance of the GMM rod driven by the coil magnetic field is stabilized, thereby improving the accuracy of the actuator.

[0004] Even so, existing actuators still have some areas for improvement. The reasons are as follows: During the operation of the electrostatic-hydraulic actuator, the GMM rod, influenced by the coil's magnetic field, squeezes the oil in the pump chamber. Simultaneously, due to electromagnetic induction, the GMM rod generates eddy currents, rapidly increasing its temperature. When the coil's magnetic field is removed, the GMM rod should retract according to its preset recovery characteristics to reset the actuator's push rod. However, due to the excessive temperature of the GMM rod at this point, the material's physical properties change to a certain extent, limiting its retraction length. This, in turn, directly affects the starting position and extension of the actuator's push rod during the next extension cycle, negatively impacting the actuator's precision.

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

[0006] The purpose of the present invention is to provide a high-precision anti-glare actuator, which solves the problem of insufficient heat dissipation efficiency of the GMM rod, affecting its own retraction, and thus reducing output accuracy. By accelerating oil exchange during the retraction process of the GMM rod, and changing the pre-stress position and filtering oil impurities through oil exchange, the purpose of quickly dissipating the heat of the GMM rod is achieved, thereby improving the accuracy of the actuator, and having the effect of making the GMM rod maintain stability for a long time, thereby improving the anti-glare performance of the actuator.

[0007] To achieve the above object, the present invention provides the following technical solutions:

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

[0009] The oil inlet valve is opened and the oil outlet valve is closed to provide pre-pressure for 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 opened to circulate the oil under the action of the oil pump.

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

[0011] In the above scheme, the spiral circulation channel is provided 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 sensitive to the magnetic field strength provided by the coil. During operation, the circumference of the GMM rod cannot have defects, nor can it be installed or contact other objects. Therefore, a gap is left between the GMM rod and the limit cavity to form an oil film lubrication, thereby avoiding restrictions on the elongation performance of the GMM rod;

[0013] Actuators are commonly used in helicopters and various vehicles. Therefore, to improve driving safety, when they are installed exposed, their anti-glare performance is a key inspection standard. Anti-glare performance is primarily considered from two aspects: the material itself and vibration damping. Various surface treatments, such as ultra-black surface treatment, are available for the material. Regarding vibration damping, due to the oil film lubrication method of the GMM rod, there is a large runout space, so vibration damping treatment of the GMM rod is very necessary.

[0014] Preferably, the thickness of the circulation channel increases from top to bottom, and the constituent material of the circulation channel includes bronze particles;

[0015] In the above scheme, the longer the length of the oil film (that is, the thickness of the circulation channel in this scheme), the better the vibration damping effect, and accordingly, the GMM rod is more stable. However, as the thickness of the circulation 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 circulation channel to be gradual, and the advantage of making the thickness at the bottom larger is that: during the operation of the actuator, the heat is mainly caused by the eddy current formed by the GMM rod under the action of the coil magnetic field, and the oil has a tendency for the cold oil to be located below the hot oil, so the oil temperature of the buffer cavity below the limit cavity is lower, so the large thickness part with poor heat dissipation capacity and excellent vibration damping performance is located below the circulation channel; bronze particles have excellent thermal conductivity, and their addition further promotes the heat dissipation performance of the circulation channel from the material itself.

[0016] It can be seen 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 full contact with the driving piston to avoid being subjected to the pressure of the oil in the preload cylinder. There are many ways to install the lower end of the GMM rod, 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 problem of unstable support for the GMM rod, which in turn affects the anti-glare performance of the actuator.

[0017] Preferably, the bracket includes a pillar, a support plate and a sliding vane, the pillar is connected to the inner bottom surface of the buffer cavity, the support plate is fixedly connected to the upper end surface of the pillar, and the outer diameter of the support plate is not less than the outer diameter of the GMM rod, the sliding vane is rotatably connected to the pillar, and the sliding vane is located below the support plate, and the support plate has a circumferential array of pre-load holes;

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

[0019] Preferably, the sliding vane comprises a ring portion and a leaf portion, the leaf portion is arranged in a fan-shaped structure, the ring portion is rotatably connected to the support, and a plurality of leaf portions are arrayed at equal angles on the ring portion;

[0020] In the above scheme, the contact position between the upper end face of the leaf and the lower end face of the support plate is changed by means of the rotation of the ring around the pillar, so that the unobstructed pre-stressing hole on the support plate changes each time pre-stressing occurs, and under the shielding effect of the leaves in the equi-angle array, the unobstructed pre-stressing hole always remains symmetrical, so that the GMM rod on the support plate can not only be subjected to uniform and stable pre-stressing, but the position where it is subjected to pre-stressing can also be changed to avoid local long-term pressure, thereby enhancing the durability of the GMM rod and improving the working stability of the actuator.

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

[0022] In the above scheme, the oil in the pre-stress cylinder is directedly drained through the circulation channel to provide rotational power for the fan blades, which in turn drives the sliding blades to rotate around the pillar to change the position of the pre-stressed lower end face of the GMM rod. During the rotation process, the fan blades can also collect impurities in the oil 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 extension.

[0023] Preferably, the support column includes a side column and a middle column, a plurality of the side columns are arranged in a circular array on the outer periphery of the support plate, and the middle column is inserted under the support plate, and the middle column is rotatably connected to the ring portion;

[0024] In the above scheme, the side columns form substantial support for the support plate, and the sliding blades are connected by rotating the middle column. The advantages of this arrangement are: 1) it provides sufficient space for the rotation of the fan blades, so that the oil can exert more force on the fan blades and the fan blades can better filter impurities in the oil; 2) the middle column does not need to be connected to the inner bottom surface of the buffer chamber, thereby providing space for the installation of the oil inlet valve.

[0025] Preferably, the oil inlet valve is arranged on the lower wall of the buffer cavity, and the oil inlet valve is located directly below the center column, and the oil outlet valve is arranged on the side wall of the limit cavity, and the oil outlet valve is directly opposite to the upper port of the circulation channel.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention provides a spiral circulation channel to allow the oil inside the preload cylinder to flow rapidly and directionally, so that the GMM rod can effectively and quickly dissipate heat during the oil flow process, so that the actuator can quickly retract after losing the magnetic field effect, thereby ensuring the high precision of the actuator. The drainage of the circulation channel provides rotational power for the sliding vanes on the bracket, so that the position of the preloaded lower end surface of the GMM rod can be changed through the rotation of the sliding vanes, thereby making the lower end surface of the GMM rod evenly compressed, thereby enhancing the durability of the GMM rod. The sliding vanes filter impurities in the oil during rotation, so that the lubricating oil film of the GMM rod has higher purity, thereby improving the stability of the GMM rod and thus improving the anti-glare property of the actuator.

[0028] 2. The present invention uses the gradient change of the circulation channel to ensure the length of the lubricating oil film between itself and the GMM rod by using the large thickness part, thereby improving the vibration damping effect of the oil film, thereby making the GMM rod more stable, thereby improving the anti-glare property of the actuator; and improves its own thermal conductivity through the small thickness part, thereby making it easier to discharge the heat of the GMM rod, thereby improving the accuracy of the actuator, and the thickness of the circulation channel increases from top to bottom, thereby allowing the thicker part to contact the oil with a lower temperature in the buffer cavity, thereby weakening the adverse effect of the thicker part on the heat dissipation effect of the GMM rod.

[0029] 3. The present invention sets the bracket as a fixed support plate and a rotating sliding blade, and forms a stable support for the GMM rod through the large-area support plate, and realizes the pre-stressing of the lower end face of the GMM rod through the pre-stressing holes in the circumferential array on the support plate. The sliding blade rotates under the action of the circulation channel to cover the pre-stressing holes on the support plate, so that the position of the lower end face of the GMM rod being pre-stressed is different each time, thereby enhancing the durability of the GMM rod, and through the equal-angle setting of multiple sliding blades, the position of the unobstructed pre-stressing holes on the support plate is always symmetrical about the diameter of the support plate, so as to ensure the stability of the GMM rod during the pre-stressing and subsequent elongation process. In addition, through the filter holes set on the fan blades of the sliding blade, the impurities in the oil in the pre-stressing cylinder can be effectively absorbed, thereby ensuring the purity of the lubricating oil film between the GMM rod and the circulation channel, so that the GMM rod is more stable during the elongation process, thereby improving the anti-glare property of the actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It 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 cross-section isometric structure of the present invention;

[0032] Figure 3 It is a schematic diagram of the overall internal cross-section structure of the present invention;

[0033] Figure 4 For the present invention Figure 3A magnified schematic diagram of part A;

[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 A magnified schematic diagram of part B;

[0037] Figure 8 For the present invention Figure 3 Enlarged schematic diagram of part C in the middle.

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

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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.

[0040] See also Figures 1 to 8 The present invention provides a high-precision anti-glare actuator, and the technical solution is as follows:

[0041] A high-precision anti-glare actuator includes an actuator cylinder 1, an actuator piston 2, a driving cylinder 3, a driving piston 4, a coil 5, a GMM rod 6, 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 actuator piston 2 is installed inside the actuator cylinder 1, the driving cylinder 3 is located below the actuator cylinder 1, the driving piston 4 is installed inside the driving cylinder 3, the upper end surface of the GMM rod 6 is pressed against the driving piston 4, the pre-compression cylinder 7 is located below the driving 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 coil 5 is placed in the groove outside the limiting cavity 71, the bracket 8 is located inside the buffer cavity 72, and the upper end surface of the bracket 8 is pressed against the lower end surface 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 respectively located in the buffer cavity 72 and the limiting cavity 71, and 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 oil inlet valve 10, the oil pump 12, the cold oil tank 9 and the oil outlet valve 11 are connected in series through an oil pipe. When working, 1) the oil inlet valve 10 is opened and the oil outlet valve 11 is closed, the oil pump 12 draws the oil from the cold oil tank 9 and pumps it into the pre-compression cylinder 7, thereby increasing the oil pressure inside the pre-compression cylinder 7 until the oil pressure value of the oil pump 12 on the oil inlet valve 10 side reaches the pre-compression value; 2) the oil inlet valve 10 and the oil outlet valve 11 are both closed, and the oil pump 12 stops running, thereby maintaining the oil pressure in the pre-compression cylinder 7; 3) the oil inlet valve 10 and the oil outlet valve 11 are both opened, and the oil pump 12 pumps oil from the cold oil tank 9 to the pre-compression cylinder 7, thereby circulating the oil inside the pre-compression cylinder 7 to quickly cool down the GMM rod 6; further, in order to improve the cooling efficiency of the GMM rod 6 during oil circulation, cooling facilities such as water cooling, air cooling, etc. can be arranged on the outside of the cold oil tank 9; the oil flow path is as follows Figure 3 Indicated by the arrow.

[0042] As an embodiment of the present invention, refer to Figure 3 A circulation channel 711 is provided inside the limiting cavity 71, and the circulation channel 711 is arranged in a spiral structure; the circulation channel 711 is fixed on the inner wall of the limiting cavity 71, and there are two manufacturing methods for the combination of the circulation channel 711 and the pre-stressing cylinder 7. One is to perform internal processing on the pipe, mill out or bore out the circulation channel 711; the other is to process the pre-stressing cylinder 7 and the circulation channel 711 separately, and then connect the two (using different connection methods according to different materials, such as welding, gluing, etc.); of these two production methods, the former has a high production cost, but the surface of the integrally manufactured workpiece is smooth and has fewer defects, so it has a better oil diversion effect, and accordingly, it promotes the heat dissipation effect of the GMM rod 6 more significantly; the latter has a low production cost, but the heat dissipation effect is inferior to the former. In actual production, the processing method can be selected according to actual needs.

[0043] As an embodiment of the present invention, refer to Figure 4 The thickness of the circulation channel 711 increases from top to bottom, and the constituent material of the circulation channel 711 includes bronze particles. In this method, the thicknesses of the three adjacent spirals of the circulation channel 711 from bottom to top are respectively recorded as d1, d2 and d3, and their size relationship is: d1>d2>d3. A longer lubricating oil film is formed between the portion of the circulation channel 711 with a thickness of d1 and the GMM rod 6, thereby making the vibration damping effect of this portion of the oil film stronger, thereby ensuring the high stability of the GMM rod 6 during the extension and retraction process, thereby improving the anti-glare effect of the actuator. Performance, and the portion of the circulation channel 711 with a thickness of d1 is adjacent to the buffer chamber 72. Through heat exchange with the low-temperature oil inside the buffer chamber 72, its own temperature can be kept at a low level, thereby weakening the limitation of its own thickness on thermal conductivity, thereby improving the overall heat dissipation effect of the GMM rod 6, thereby making the actuator more accurate; as for the specific values of d1, d2 and d3, it is necessary 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] In terms of manufacturing materials, according to the above two manufacturing methods, there are two different material combinations, as follows: if the circulation channel 711 and the pre-compression cylinder 7 are manufactured separately, then in order to further improve the heat dissipation efficiency of the GMM rod 6, the circulation channel 711 is mainly made of epoxy resin-based composite materials, and spherical bronze particles with a volume ratio of 20% to 30% and an average particle size of 10 to 20 microns are added, and then made through a molding process; if integrated manufacturing is used, bronze particles are sprayed on the surface of the formed circulation channel 711.

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

[0046] As an embodiment of the present invention, refer to Figure 6The sliding vane 83 includes a ring portion 831 and a blade portion 832. The blade portion 832 is arranged in a fan-shaped structure. The ring portion 831 is rotatably connected to the pillar 81. A plurality of blade portions 832 are arranged in an equal angle array on the ring portion 831. The upper end surface of the blade portion 832 is in close contact with the lower end surface of the support plate 82 (when the internal high pressure of the pre-compression cylinder 7 is high, since the upper end surface of the blade portion 832 is not in contact with the oil, the pressure on the lower end surface of the blade portion 832 will cause the blade portion 832 to have an upward movement trend, thereby causing the blade portion 832 to automatically adhere to the support plate 82. Accordingly, when the oil circulates (that is, when the GMM rod 6 loses the magnetic field effect and begins to return), After contraction, the GMM rod 6 needs to dissipate heat quickly to ensure the output accuracy when it is extended again), the internal pressure of the pre-stressing cylinder 7 is weakened, and the tight-fitting effect is correspondingly weakened, thereby reducing the relative friction between the support plate 82 and the leaf 832 to promote the rotation of the leaf 832), so as to prevent the infiltration of oil when the leaf 832 covers the pre-stressing hole 821, thereby avoiding the covered pre-stressing hole 821 from forming pre-stress on the lower end face of the GMM rod 6; in addition, in order to further promote the rotation of the leaf 832, the upper end face of the leaf 832 and the lower end face of the support plate 82 are surface treated to reduce the friction coefficient.

[0047] As an embodiment of the present invention, refer to Figure 5 and Figure 6 , fan blades 8321 are provided on the periphery of the leaf portion 832, and filter holes 8322 are opened on the fan blades 8321; in this method, a plurality of fan blades 8321 inclined up and down are provided on the periphery of each leaf portion 832, and the inclination angle of the fan blades 8321 can be selected between 15° and 25° to convert the thrust during the circulation of the oil into the power for the rotation of the leaf portion 832; and filter holes 8322 are opened on the fan blades 8321 to absorb 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, so as to improve the anti-glare performance of the actuator. In the attached drawings, the filter holes 8322 are magnified for the convenience of display. In actual production, porous materials can be directly used to manufacture the fan blades 8321.

[0048] As an embodiment of the present invention, refer to Figure 6 The pillar 81 includes a side column 811 and a middle column 812. A plurality of side columns 811 are arranged in a circular array on the periphery of the support plate 82. The side columns 811 play a substantial supporting role on the support plate 82. In order to ensure the support stability of the side columns 811 under the high pressure inside the preload cylinder 7, the lower end of the side column 811 is welded to the inner bottom of the preload cylinder 7, and the middle column 812 is inserted under the support plate 82. A bearing is installed between the middle column 812 and the ring portion 831 to realize the rotation connection between the two. In this method, in order to ensure the stability of the sliding leaf 83 and thus the stability of the actuator, the use of Figure 6 The connector shown in the figure securely connects the center column 812 to the side column 811 .

[0049] As an embodiment of the present invention, refer to Figure 7 and Figure 8 The oil inlet valve 10 is arranged on the lower wall of the buffer chamber 72, and the oil inlet valve 10 is located directly below the middle column 812, and the oil outlet valve 11 is arranged on the side wall of the limit chamber 71, and the oil outlet valve 11 is directly opposite to the upper port of the circulation channel 711; in this method, the oil inlet valve 10 is arranged directly below the middle column 812, so that the oil pumped in from the oil inlet valve 10 can be in uniform contact with each fan blade 8321, so as to avoid the phenomenon of the sliding blade 83 shaking caused by inconsistent force, thereby improving the overall stability of the actuator, thereby improving the anti-glare performance of the actuator; the oil outlet valve 11 is arranged 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 is extended by the magnetic field of the coil 5 and heated up due to its own eddy current. When the magnetic field of the coil 5 is removed, the GMM rod 6 retracts, but its retraction length is limited by its own temperature, and this influence is transmitted to the subsequent extension and retraction process of the GMM rod 6, which is not conducive to the continuous operation of the actuator. In order to eliminate this influence, the present invention aims to enhance the heat dissipation efficiency of the GMM rod 6. Specifically, an oil circulation system is formed by an oil pump 12, a cold oil tank 9, an oil inlet valve 10, an oil outlet valve 11 and a pre-compression cylinder 7. After the magnetic field of the coil 5 is removed, the oil circulates through the system to reduce the temperature of the GMM rod 6. In order to further improve the heat dissipation efficiency of the GMM rod 6 by this method, 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 the oil to move quickly and directionally, thereby enhancing the cooling effect on the GMM rod 6. The thickness of the circulation channel 711 increases from top to bottom. The large thickness portion is used to ensure the length of the lubricating oil film between itself and the GMM rod 6, thereby enhancing the vibration damping effect of the oil film, thereby making the GMM rod 6 more stable, thereby improving the anti-glare performance of the actuator. The small thickness portion also improves its own thermal conductivity, thereby making the heat of the GMM rod 6 easier to discharge, thereby improving the accuracy of the actuator. The large thickness portion is brought into contact with the lower temperature oil in the buffer cavity 72, thereby weakening the adverse effect of the large thickness portion 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 the extension process. Therefore, the present invention collects impurities in the oil by means of the sliding vanes 83 rotating on the pillars 81, as follows:

[0053] The four side columns 811 support the support plate 82, and then support the GMM rod 6 on the support plate 82. At the same time, the middle column 812 is inserted in the center of the support plate 82, and the sliding vane 83 is rotatably connected to the middle column 812, so that the power provided by the drainage through the circulation channel 711 drives the sliding vane 83 to rotate, thereby adsorbing impurities through the filter hole 8322 on the leaf portion 832 of the sliding vane 83 to purify the lubricating oil film; and through the rotation of the sliding vane 83, the covering position of the pre-stressing hole 821 on the support plate 82 can also be replaced, so that the lower end face of the GMM rod 6 is subjected to pre-stressing at different positions during each pre-stressing process, thereby avoiding local damage, and then enhancing the durability of the GMM rod 6 to improve the working stability of the actuator.

[0054] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention 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 mounted inside the actuator cylinder (1), the drive cylinder (3) is located below the actuator cylinder (1), the drive piston (4) is mounted inside the drive cylinder (3), and the upper end surface of the GMM rod (6) is pressed 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 driving cylinder (3), and the interior of the pre-compression cylinder (7) includes a limit 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) is pressed 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 respectively located in the buffer cavity (72) and the limit cavity (71); and the oil pump (12) is installed between the oil inlet valve (10) and the cold oil tank (9); The oil inlet valve (10) is opened and the oil outlet valve (11) is closed, and pre-pressure is provided to the GMM rod (6) under the action of the oil pump (12). The oil inlet valve (10) and the oil outlet valve (11) are both closed to maintain the internal oil pressure of the pre-pressure cylinder (7) constant. The oil inlet valve (10) and the oil outlet valve (11) are both opened, and the oil circulates under the action of the oil pump (12).

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

3. The 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 constituent material of the circulation channel (711) includes bronze particles.

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

5. The high-precision anti-glare actuator according to claim 4, characterized in that: The sliding blade (83) includes a ring portion (831) and a blade portion (832), wherein the blade portion (832) is arranged in a fan-shaped structure, the ring portion (831) is rotatably connected to the support (81), and a plurality of blade portions (832) are arrayed at equal angles on the ring portion (831).

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

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

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

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