A general high-precision zero-position adjustment device for a linear electric actuator

Abstract

The present invention discloses a general high-precision zero-position adjusting device for a linear electric actuator, which includes a base, a guide rail and a ball screw pair; first baffles and second baffles are respectively arranged at the longitudinal two ends of the base; the ball screw pair includes a lead screw and a lead screw nut, a knob is arranged at the end of the lead screw, and a circle of scales is arranged around the circumference of the knob; a fixed bracket is arranged on the inner side of the first baffle, a moving bracket is arranged on the top of the lead screw nut, and corresponding linear actuator hinge holes are arranged on both the fixed bracket and the moving bracket; a pointer is arranged on the side of the lead screw nut, and at the same time, scales are arranged longitudinally on the base, and the lead screw nut can slide along the guide rail under the action of the knob. According to the zero-position length of different linear actuators, the present invention can realize the zero-position adjustment function of the linear actuator within a certain length range by adjusting the position of the moving bracket, and the universality of the zero-position adjustment of the linear actuator can be realized only by replacing the corresponding fixed bracket and moving bracket according to the interfaces of different actuators.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric actuators for aerospace vehicles, and particularly relates to a general high-precision zero-position adjusting device for a linear electric actuator. Background Art

[0002] As an actuator for controlling the rudder surfaces of aerospace vehicles such as missiles and shells at present, the electric actuator has developed rapidly in the field of servo control. The position accuracy of the actuator will affect the flight accuracy of the projectile. The mechanical zero position and the electrical zero position of the actuator need to be controlled within a small error range. Therefore, it is necessary to adjust the electrical zero position to coincide with the mechanical zero position after positioning the mechanical zero position.

[0003] With the increasing variety of projectiles, different electric actuators need to be matched for different types of projectiles, resulting in an increase in the types of actuators. A zero-position adjusting tooling is required for the production and debugging of each type of actuator.

[0004] Moreover, for pre-research projects of electric actuators or electric actuators in the development stage, in most cases, there is no corresponding dedicated zero-position adjusting device, but calipers are used for measurement or the zero position is adjusted using a load platform, resulting in low accuracy. Summary of the Invention

[0005] In view of one or more of the above deficiencies or improvement requirements in the prior art, the present invention provides a general high-precision zero-position adjusting device for a linear electric actuator, which realizes the zero-position adjusting function of the linear actuator within a certain length range and also realizes the universality of the zero-position adjustment of the linear actuator.

[0006] To achieve the above object, the present invention provides a general high-precision zero-position adjusting device for a linear electric actuator, including a base, on which parallel guide rails and a ball screw pair are longitudinally provided;

[0007] First baffles and second baffles for supporting both ends of the guide rails and the ball screw pair are respectively provided at both longitudinal ends of the base; the ball screw pair includes a screw and a screw nut provided on the screw. A knob is provided at the end of the screw, and a first scale is provided around the circumference of the knob;

[0008] A fixed bracket is provided inside the first baffle, a moving bracket is provided on the top of the screw nut, and corresponding hinge holes for the linear actuator are provided on both the fixed bracket and the moving bracket;

[0009] A pointer is provided on the side of the screw nut, and a second scale is longitudinally provided on the base. The screw nut can slide along the guide rail under the action of the knob.

[0010] As a further improvement of the present invention, angular contact ball bearings are respectively installed inside the first baffle and the second baffle, and both ends of the ball screw pair are respectively installed inside the corresponding angular contact ball bearings.

[0011] As a further improvement of the present invention, the bearing hole in the second baffle is a through hole, and a bearing baffle is installed on the outer side of the second baffle. A through hole is provided in the bearing baffle, and the ball screw pair passes through the through hole, and its end is connected to the knob.

[0012] As a further improvement of the present invention, an indication mark corresponding to the first scale is provided on the outer side of the bearing baffle.

[0013] As a further improvement of the present invention, fork ears matching the guide rail are provided on the lead screw nut.

[0014] As a further improvement of the present invention, the guide rails are symmetrically arranged on both sides of the ball screw pair, and fork ears matching the corresponding side guide rails are provided on both sides of the lead screw nut.

[0015] As a further improvement of the present invention, the first connection end of the guide rail is a first cylindrical section, and its second connection end includes a second cylindrical section and a threaded section, wherein the threaded section is arranged at the outer end.

[0016] As a further improvement of the present invention, the first cylindrical section is connected to the second baffle, the second cylindrical section is connected to the first baffle, and the threaded section passes through the first baffle and is threadedly connected to the locking nut, thereby locking the guide rail.

[0017] As a further improvement of the present invention, the fixed bracket is installed on the base, and is positioned with respect to the base by a cylindrical pin; the moving bracket is installed on the lead screw nut, and the two are positioned with respect to each other by a cylindrical pin.

[0018] As a further improvement of the present invention, the height dimensions of the linear servo hinge holes on the fixed bracket and the moving bracket with respect to the base are kept consistent.

[0019] Generally speaking, compared with the prior art by the above technical solution conceived by the present invention, the following beneficial effects are achieved:

[0020] (1) For the linear electric servo universal high-precision zero position adjusting device of the present invention, according to the different zero position lengths of different linear servos, the adjusting knob is used to slide the lead screw nut, driving the moving bracket to reach the required dimensional position, so as to realize the zero position adjusting function of the linear servo within a certain length range. When different interfaces appear on the linear servo, only the corresponding fixed bracket and moving bracket need to be replaced according to the interfaces of different servos, realizing the universality of the zero position adjustment of the linear servo.

[0021] (2)The general high-precision zero-position adjustment device for the linear electric actuator of the present invention has a simple and compact structure, good assembly processability, and high positioning accuracy. By reasonably designing the lead of the ball screw pair and the scale division on the knob, the zero-position adjustment device can meet the expected accuracy requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is a schematic view of the installation state of the general high-precision zero-position adjustment device for the linear electric actuator and the linear electric actuator according to an embodiment of the present invention;

[0023] Figure 2 FIG. is a top view structural schematic diagram of the general high-precision zero-position adjustment device for the linear electric actuator according to an embodiment of the present invention;

[0024] Figure 3 FIG. is a three-dimensional structural schematic diagram of the general high-precision zero-position adjustment device for the linear electric actuator according to an embodiment of the present invention;

[0025] Figure 4 FIG. is a schematic diagram of the guide rail structure involved in the general high-precision zero-position adjustment device for the linear electric actuator according to an embodiment of the present invention;

[0026] Figure 5 FIG. is a schematic diagram of the ball screw nut structure involved in the general high-precision zero-position adjustment device for the linear electric actuator according to an embodiment of the present invention;

[0027] Figure 6 FIG. is a schematic diagram of the bearing nut structure involved in the general high-precision zero-position adjustment device for the linear electric actuator according to an embodiment of the present invention.

[0028] In all the drawings, the same reference numerals represent the same technical features, specifically: 1 - lock nut, 2 - first baffle, 3 - angular contact ball bearing, 4 - guide rail, 5 - base, 6 - ball screw pair, 7 - second baffle, 8 - knob, 9 - bearing baffle, 10 - pointer, 11 - fixed bracket, 12 - moving bracket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0034] Please refer to Figures 1 to 6, the general high-precision zero-position adjustment device for the linear electric steering gear of the present invention includes a base 5. Along the longitudinal direction on the base 5, there are parallel guide rails 4 and a ball screw pair 6. At both longitudinal ends of the base 5, there are respectively a first baffle 2 and a second baffle 7 that support both ends of the guide rail 4 and the ball screw pair 6. Corresponding angular contact ball bearings 3 are installed inside both the first baffle 2 and the second baffle 7. The angular contact ball bearings 3 are respectively installed in the corresponding bearing holes of the first baffle 2 and the second baffle 7. Both ends of the ball screw pair 6 are respectively installed in the corresponding angular contact ball bearings 3.

[0035] Preferably, the bearing hole in the second baffle 7 is a through hole, and a bearing baffle 9 is installed outside the second baffle 7 to block the bearing on this side. And, there is a through hole in the bearing baffle 9, and the screw of the ball screw pair 6 passes through this through hole, and its end is connected to a knob 8.

[0036] Both ends of the guide rail 4 are respectively installed in the first baffle 2 and the second baffle 7. The first connection end of the guide rail 4 is a first cylindrical section 401, and its second connection end includes a second cylindrical section 402 and a threaded section 403, where the threaded section is provided at the outer end. The first cylindrical section 401 is connected to the second baffle 7, the second cylindrical section 402 is connected to the first baffle 2, and the threaded section 403 passes through the first baffle 2 and is threadedly connected to a locking nut 1, thereby locking the guide rail.

[0037] In the preferred embodiment of the present invention, the guide rails 4 are symmetrically arranged on both sides of the ball screw pair 6 and are respectively parallel to the screw of the ball screw pair 6. The first connection end and the second connection end of the guide rail 4 are on the same side, that is, the first connection ends are all connected to the first baffle 2, and the second connection ends are all connected to the second baffle 7.

[0038] Further, the ball screw pair 6 includes a screw 601 and a screw nut 602. The screw nut 602 is arranged on the screw 601, and the screw nut 602 is provided with a fork ear 6021 that matches the guide rail 4. The fork ear 6021 is sleeved on the guide rail 4, so that the screw nut 602 can slide back and forth longitudinally on the guide rail 4.

[0039] In the preferred embodiment of the present invention, fork ears 6021 that match the corresponding side guide rail 4 are provided on both sides of the screw nut 602, and the fork ears 6021 on both sides are simultaneously sleeved on the corresponding guide rail 4.

[0040] Further, a fixed bracket 11 is provided inside the first baffle 2. The fixed bracket 11 is installed on the base 5, and the fixed bracket 11 and the base 5 are positioned by a cylindrical pin. The top of the screw nut 602 of the ball screw pair 6 is provided with a moving bracket 12, and the moving bracket 12 and the screw nut 602 are positioned by a cylindrical pin.

[0041] Corresponding linear servo hinge holes are provided on both the fixed bracket 11 and the movable bracket 12, and the height dimensions of the linear servo hinge holes of the two with respect to the base need to be kept consistent.

[0042] Furthermore, as Figure 3 shown, a first scale 801 is provided around the circumference of the knob 8, and the large scale is divided into K parts and the fine scale is divided into 2K parts. In a specific embodiment of the present invention, the knob scale is evenly divided into 20 large parts and 40 small parts. At the same time, as Figure 6 shown, a corresponding indication mark 901 is provided on the outer side of the bearing baffle 9 for indicating the scale on the knob 8.

[0043] Furthermore, a pointer 10 is provided on the side of one of the fork ears 6021 of the lead screw nut, and at the same time, a second scale 501 is provided longitudinally on the base 5. The pointer 10 is used to indicate the corresponding second scale 501 on the base when the lead screw nut moves along the lead screw. In a specific embodiment of the present invention, the minimum accuracy of the scale on the base is 1 mm, and according to the size of the base, the scale on the base in this embodiment can reach 500 mm, which can cover most of the zero position sizes of the linear servo.

[0044] In addition, assuming the lead of the ball screw pair is P, the positioning accuracy of the general high-precision zero position adjustment device for the linear electric servo of the embodiment of the present invention is P / 2K. Therefore, the smaller the lead and the finer the knob scale division, the higher the positioning accuracy. Based on the principle that the smaller the lead and the higher the positioning accuracy, taking the specific embodiment of the present invention as an example, if the lead of the ball screw pair is 2 mm, the positioning accuracy of the general high-precision zero position adjustment device for the linear electric servo in this embodiment is P / 2K = 2 / 40 = 0.05 mm.

[0045] The accuracy of the first scale 801 on the knob 8 of the present invention is higher than the accuracy of the second scale 501 on the base 5. By reading the second scale 501 on the base 5 and cooperating with the precise reading of the first scale 801 on the knob 8, the precise positioning of the movable bracket can be ensured, and the overall accuracy of the zero position adjustment device can be improved.

[0046] When performing zero position adjustment on the zero position adjustment device of the present invention, by adjusting the knob, according to the pointer on the side of the lead screw nut and the scale on the knob, the movable bracket on the lead screw nut is adjusted to a set precise position, and this position is consistent with the lengths of different models of linear electric servos; further, the controller of the linear electric servo is used to control the telescopic rod of the servo to extend and retract to a corresponding length, so that its two ends are respectively matched and installed with the hinge holes of the fixed bracket and the movable bracket to complete the adjustment of the mechanical zero position of the linear electric servo; due to the telescopic movement of the telescopic rod of the servo, the zero position of the displacement sensor on the servo changes, and according to the displacement amount of the telescopic rod, the displacement sensor is moved by a corresponding displacement amount, thereby adjusting the zero position of the displacement sensor, and finally making the mechanical zero position and the zero position of the displacement sensor consistent.

[0047] The universal high-precision zero-position adjusting device for the linear electric steering gear of the present invention can adjust the screw nut to slide by turning the knob according to the different zero-position lengths of different linear steering gears, and drive the moving bracket to reach the required dimensional position, so as to realize the zero-position adjustment function of the linear steering gear within a certain length range. When different interfaces appear on the linear steering gear, only the corresponding fixed bracket and moving bracket need to be replaced according to the interfaces of different steering gears, thus realizing the universality of the zero-position adjustment of the linear steering gear.

[0048] The universal high-precision zero-position adjusting device for the linear electric steering gear of the present invention has a simple and compact structure, good assembly processability and high positioning accuracy. By reasonably designing the lead of the ball screw pair and the scale division on the knob, the zero-position adjusting device can meet the expected accuracy requirements.

[0049] It is easy for those skilled in the art to understand that the above description is only a preferred embodiment of the present invention and is not intended to limit 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 general high-precision zero-position adjustment device for a linear electric actuator, characterized in that, It includes a base (5) on which parallel guide rails (4) and a ball screw pair (6) are longitudinally provided. At both longitudinal ends of the base (5), a first baffle (2) and a second baffle (7) that support both ends of the guide rail (4) and the ball screw pair (6) are respectively provided. The ball screw pair (6) includes a lead screw (601) and a lead screw nut (602) provided on the lead screw (601). A knob (8) is provided at the end of the lead screw (601), and a first scale (801) is provided around the circumference of the knob (8). The bearing hole in the second baffle (7) is a through hole, and a bearing baffle (9) is provided outside the second baffle (7). A through hole is provided in the bearing baffle (9). The ball screw pair (6) passes through this through hole, and its end is connected to the knob (8). An indicating mark (901) corresponding to the first scale (801) is provided outside the bearing baffle (9). The guide rails (4) are symmetrically provided on both sides of the ball screw pair (6). Fork ears (6021) matching the corresponding side guide rails (4) are provided on both sides of the lead screw nut (602). A pointer (10) is provided on the side of one of the fork ears (6021) of the lead screw nut. At the same time, a second scale (501) is longitudinally provided on the base (5). The lead screw nut (602) can slide along the guide rail (4) under the action of the knob (8). The pointer (10) is used to indicate the corresponding second scale (501) on the base when the lead screw nut moves along the lead screw. A fixed bracket (11) is provided inside the first baffle (2). A moving bracket (12) is provided on the top of the lead screw nut (602). Corresponding linear servo hinge holes are provided on both the fixed bracket (11) and the moving bracket (12). The first scale (801) is divided into K large parts and 2K small parts. Assuming the lead of the ball screw pair is P, the positioning accuracy of the linear electric servo general high-precision zero-position adjustment device is P / 2K. The accuracy of the first scale (801) on the knob (8) is higher than the accuracy of the second scale (501) on the base (5). By reading the second scale (501) on the base (5) and matching with the precise reading of the first scale (801) on the knob (8), the precise positioning of the moving bracket can be ensured.

2. The general high-precision zero position adjusting device for a linear electric steering gear according to claim 1, wherein, Corresponding angular contact ball bearings (3) are installed inside both the first baffle (2) and the second baffle (7). Both ends of the ball screw pair (6) are respectively installed inside the corresponding angular contact ball bearings (3).

3. The general high-precision zero-position adjustment device for a linear electric steering gear according to claim 1, characterized in that, The first connection end of the guide rail (4) is a first cylindrical section (401), and its second connection end includes a second cylindrical section (402) and a threaded section (403), where the threaded section is provided at the outer end.

4. The universal high-precision zero-position adjusting device for a linear electric steering gear according to claim 3, characterized in that, The first cylindrical section (401) is connected to the second baffle (7), the second cylindrical section (402) is connected to the first baffle (2), and the threaded section (403) passes through the first baffle (2) and is threadedly connected to a locking nut (1) to lock the guide rail.

5. The universal high-precision zero-position adjusting device for a linear electric steering gear according to any one of claims 1-4, characterized in that The fixed bracket (11) is installed on the base (5), and is positioned with the base (5) by a cylindrical pin; the movable bracket (12) is installed on the lead screw nut (602), and the two are positioned by a cylindrical pin.

6. The general high-precision zero position adjusting device for a linear electric steering gear according to any one of claims 1-4, characterized in that, The height dimensions of the hinge holes of the linear servo on the fixed bracket (11) and the movable bracket (12) are the same relative to the base.

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