Electric actuator with stroke capable of being adjusted in echelon mode

Abstract

The electric actuator comprises a base body, a push rod set, an end cover, an ignition piece, a medicine box and an end plate, the push rod set is composed of multiple layers of push rods from inside to outside, the push rod set is integrally installed in a center through cavity of the base body, and a gap is formed between the push rod on the outermost layer and the center through cavity of the base body through a step part; a gap is formed between the circumferential outer wall of the inner push rod and the central through hole of the outer push rod in the adjacent layers of push rods through a step part, at least one gap is filled with a stroke adjusting piece, the medicine box is arranged in the central through hole of the innermost push rod, the end cover is connected to the end face of one axial end of the seat body in a covering mode, and an orifice in one end of the central through hole of each layer of push rod is sealed by the end cover. The ignition piece is installed on the end cover and aligned with the medicine box, and the end plate is connected to the other axial end face of the base in a covering mode. The movement stroke can be adjusted in an echelon mode, and the device can be suitable for weaponry with different operation stroke requirements.

Description

Technical Field

[0001] This invention relates to the field of electric actuators, specifically an electric actuator with adjustable stroke in stages. Background Technology

[0002] Electro-actuators in weaponry generally use piston-type electro-actuators. Although their structures vary slightly depending on the application requirements, the main structure and working principle remain the same. They mainly utilize the energy generated by the combustion of the ignition element to ignite the main charge in the electro-actuator. The main charge completes combustion within milliseconds and generates high-temperature, high-pressure gas. The pressure generated by the gas expansion acts on the piston end face. When the pressure is greater than the force constraining the piston, the piston is released from its constraint and moves along the axial direction of the electro-actuator.

[0003] The existing piston-type electric actuators have a fixed stroke, which cannot be adjusted according to the different stroke requirements of weapons and equipment, thus resulting in poor versatility. Summary of the Invention

[0004] This invention provides an electric actuator with adjustable stroke in stages, to solve the problem of the inability to adjust the stroke of existing piston-type electric actuators.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An electric actuator with adjustable stroke includes a base (1), a push rod assembly, an end cap (4), an ignition element (5), a powder box (6), and an end plate (7); the base (1) has a central cavity (1.1) inside, which is a stepped cavity with a stepped section, and the stepped section divides the central cavity (1.1) into two sections, one of which is a large diameter section and the other is a small diameter section; The push rod assembly includes multiple layers of push rods from the inside out. Each push rod has a central through hole, which is a stepped through hole with a stepped portion. The stepped portion divides the central through hole of each push rod into two sections, one of which is a large-diameter section and the other of which is a small-diameter section. The circumferential outer wall of each push rod is a stepped outer wall with a stepped portion, which divides the circumferential outer wall of each push rod into two sections, one of which is a large outer diameter section and the other of which is a small outer diameter section. In two adjacent push rods, the outer diameter of the large outer diameter section of the circumferential outer wall of the inner push rod matches the diameter of the large diameter section of the central through hole of the outer push rod, and the outer diameter of the small outer diameter section of the circumferential outer wall of the inner push rod matches the diameter of the small diameter section of the central through hole of the outer push rod. In two adjacent push rods, the inner push rod is coaxially installed in the central through hole of the outer push rod. The entire large outer diameter section of the circumferential outer wall of the inner push rod is located within the large diameter section of the central through hole of the outer push rod, and a portion of the small outer diameter section of the circumferential outer wall of the inner push rod is located within the small diameter section of the central through hole of the outer push rod. Furthermore, there is a gap formed by an axial distance between the stepped portion of the circumferential outer wall of the inner push rod and the stepped portion of the central through hole of the outer push rod. In the push rod assembly, the outer diameter of the outermost push rod's circumferential outer wall with a large outer diameter section matches the diameter of the large diameter section of the central cavity (1.1) of the seat body (1), and the outer diameter of the outermost push rod's circumferential outer wall with a small outer diameter section matches the diameter of the small diameter section of the central cavity (1.1) of the seat body (1); the push rod assembly is coaxially installed in the central cavity (1.1) of the seat body (1), the entire outermost push rod's circumferential outer wall with a large outer diameter section is located within the large diameter section of the central cavity (1.1) of the seat body (1), a portion of the outermost push rod's circumferential outer wall with a small outer diameter section is located within the small diameter section of the central cavity (1.1) of the seat body (1), and a gap is formed between the stepped portion of the outermost push rod's circumferential outer wall and the stepped portion of the central cavity (1.1) of the seat body (1) by a certain distance in the axial direction; and the opening of the large diameter section of the central through hole of each push rod is flush with the opening of the large diameter section of the central cavity (1.1) of the seat body (1); The gap formed between the outermost push rod circumferential outer wall step and the central cavity (1.1) step of the seat (1), and the gap formed between the inner push rod circumferential outer wall step and the outer push rod central through hole in the two adjacent push rods, at least one gap is filled with one or more stroke adjustment pieces (8), and when the gap is filled with multiple stroke adjustment pieces (8), each stroke adjustment piece (8) is arranged axially in the gap; The medicine box (6) is located in the large-diameter section of the central through hole of the innermost push rod in the push rod assembly; The end cap (4) covers the axial end face of the seat body (1) where the cavity opening of the large diameter section of the central through cavity (1.1) of the seat body (1) is located, thereby sealing the opening of the large diameter section of the central through hole of each push rod by the end cap (4); the igniter (5) is installed on the end cap (4), and the ignition part of the igniter (5) extends into the central through hole of the innermost push rod of the push rod assembly and is aligned with the medicine box (6). The end plate (7) covers the other end face of the seat (1) in the axial direction, and the other end of at least one push rod in the push rod assembly is in contact with the end plate (7).

[0006] Furthermore, the end cap (4) is a screw cap, which is screwed onto one end of the axial direction of the seat body (1) where the cavity opening of the large diameter section of the central cavity (1.1) of the seat body (1) is located.

[0007] Furthermore, the end plate (7) is connected to the other end face of the seat (1) by bolts (9), and a section of the bolt (9) has V-shaped grooves (9.1) on two symmetrical sides.

[0008] Furthermore, the stroke adjustment piece (8) has a ring structure.

[0009] Furthermore, the outer diameter of the medicine box (6) matches the diameter of the large-diameter section of the central through hole of the innermost push rod.

[0010] Furthermore, the end plate (7) has a central protrusion, the outer diameter of which matches the diameter of the small diameter section of the central through hole of the innermost push rod, and the central protrusion of the end plate (7) penetrates into the small diameter section of the central through hole of the innermost push rod.

[0011] Compared with existing piston-type electric actuators, the push rod assembly in this invention consists of multiple layers of push rods from the inside out, thus enabling sufficient stroke.

[0012] Furthermore, in this invention, at least one gap is provided with a stroke adjustment piece in the gap between the outermost push rod circumferential outer wall step portion and the seat central through cavity step portion, and in the gap formed between the inner push rod circumferential outer wall step portion and the outer push rod central through hole step portion of the two adjacent push rods. By increasing or decreasing the number of stroke adjustment pieces, the movement stroke can be adjusted.

[0013] Furthermore, in this invention, after removing the end cap, the outermost push rod can be pulled out from the base, and the inner push rod can be pulled out from the outer push rod. Then, the stroke adjustment plate can be added as needed and then reassembled. This allows for the installation of the stroke adjustment plate, which has the advantage of convenient installation and, consequently, convenient adjustment of the motion stroke.

[0014] Therefore, this invention can adjust the movement stroke in stages by increasing or decreasing the number of stroke adjustment plates, making it applicable to weapons and equipment with different movement stroke requirements, and has the advantage of convenient movement stroke adjustment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the seat structure in an embodiment of the present invention, wherein (a) is a cross-sectional view of the seat and (b) is a top view of the seat.

[0017] Figure 3 This is a schematic diagram of the outer push rod structure in an embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the inner push rod structure in an embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the assembly of the outer push rod and the inner push rod in an embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of the bolt structure in an embodiment of the present invention.

[0021] Figure 7 This is a schematic diagram of the end plate structure in an embodiment of the present invention.

[0022] Figure 8 This is a schematic diagram of a motion path formed in an embodiment of the present invention.

[0023] Figure 9 This is a schematic diagram of the maximum motion stroke formed in an embodiment of the present invention. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] like Figure 1 As shown, this embodiment discloses an electric actuator with adjustable stroke, including a base 1, a push rod assembly, an end cap 4, an ignition element 5, a powder box 6, and an end plate 7. The push rod assembly includes multiple push rods from the inside out. This embodiment uses a two-layer push rod as an example, with the two layers being an outer push rod 2 and an inner push rod 3.

[0026] like Figure 2 As shown, the axial direction of the seat 1 is... Figure 1 The center is vertical. The interior of the seat 1 has a central cavity 1.1. The central cavity 1.1 is a stepped cavity with a step portion 1.2. The step portion 1.2 divides the central cavity 1.1 into two sections in the vertical direction, with the upper section being the large diameter section and the lower section being the small diameter section.

[0027] like Figure 3 , Figure 4 , Figure 5 As shown, the axial direction of the entire push rod assembly is... Figure 1All are vertical. In the push rod assembly, the central through hole of the outer push rod 2 is a stepped through hole with a stepped portion 2.1, which divides the central through hole of the outer push rod 2 into two sections, with the upper section being a large-diameter section and the lower section being a small-diameter section. The circumferential outer wall of the outer push rod 2 is a stepped outer wall with a stepped portion 2.2, which divides the circumferential outer wall of the outer push rod 2 into two sections, with the upper section being a large-diameter section and the lower section being a small-diameter section. Furthermore, the outer diameter of the large-diameter section of the circumferential outer wall of the outer push rod 2 matches the diameter of the large-diameter section of the central through cavity 1.1 of the seat body 1, and the outer diameter of the small-diameter section of the circumferential outer wall of the outer push rod 2 matches the diameter of the small-diameter section of the central through cavity 1.1 of the seat body 1.

[0028] In the push rod assembly, the central through hole of the inner push rod 3 is a stepped through hole with a stepped portion 3.1, which divides the central through hole of the inner push rod 3 into two sections, with the upper section being the larger diameter section and the lower section being the smaller diameter section. The circumferential outer wall of the inner push rod 3 is a stepped outer wall with a stepped portion 3.2, which divides the circumferential outer wall of the inner push rod 3 into two sections, with the upper section being the larger outer diameter section and the lower section being the smaller outer diameter section.

[0029] In the push rod assembly, the outer diameter of the large outer diameter section of the inner push rod 3's circumferential outer wall matches the diameter of the large diameter section of the central through hole of the outer push rod 2, and the outer diameter of the small outer diameter section of the inner push rod 3's circumferential outer wall matches the diameter of the small diameter section of the central through hole of the outer push rod 2. The inner push rod 3 is coaxially installed in the central through hole of the outer push rod 2. The entire large outer diameter section of the inner push rod 3's circumferential outer wall is located within the large diameter section of the central through hole of the outer push rod 2, and the lower part of the small outer diameter section of the inner push rod 3's circumferential outer wall is located within the small diameter section of the central through hole of the outer push rod 3. Furthermore, there is an axial gap 10 between the stepped portion 3.2 of the inner push rod 3's circumferential outer wall and the stepped portion 2.1 of the central through hole of the outer push rod 2.

[0030] The push rod assembly is coaxially installed in the central cavity 1.1 of the base 1. The entire outer diameter section of the outer push rod 2 is located within the large diameter section of the central cavity 1.1 of the base 1. The lower part of the small diameter section of the outer push rod 2 is located within the small diameter section of the central cavity 1.1 of the base 1. Furthermore, there is a gap in the axial direction between the stepped portion 2.2 of the outer push rod 2 and the stepped portion 1.2 of the central cavity 1.1 of the base 1.

[0031] The upper end opening of the large-diameter section of the central through hole of the outer push rod 2 and the inner push rod 3 is flush with the upper end opening of the large-diameter section of the central through cavity 1.1 of the seat body 1. The lower end opening of the small-diameter section of the central through hole of the outer push rod 2 and the inner push rod 3 is flush with the lower end opening of the small-diameter section of the central through hole of the outer push rod 2 and the inner push rod 3. The axial lower end of the small-diameter section of the central through hole of the outer push rod 2 and the inner push rod 3 both pass through the lower end opening of the small-diameter section of the central through cavity 1.1 of the seat body 1.

[0032] In the gap formed between the outer wall step 2.2 of the outer push rod 2 and the step 1.2 of the central cavity 1.1 of the seat body 1, and in the gap 10 formed between the outer wall step 3.2 of the inner push rod 3 and the step 2.1 of the central through hole of the outer push rod 2, at least one gap is filled with one or more stroke adjustment pieces 8. When multiple stroke adjustment pieces 8 are filled in the gap, the stroke adjustment pieces 8 are arranged axially in the gap.

[0033] In this embodiment, each stroke adjustment piece 8 is an annular structure. When the stroke adjustment piece 8 fills the gap between the outer wall step 2.2 of the outer push rod 2 and the step 1.2 of the central cavity 1.1 of the seat 1, each stroke adjustment piece 8 is fitted onto the outer push rod 2. When the stroke adjustment piece 8 fills the gap 10 between the outer wall step 3.1 of the inner push rod 3 and the step 2.1 of the central through hole of the outer push rod 2, each stroke adjustment piece 8 is fitted onto the inner push rod 3.

[0034] The medicine box 6 is coaxially disposed within the large-diameter section of the central through hole of the inner push rod 3 in the push rod assembly. The outer diameter of the medicine box 6 matches the diameter of the large-diameter section of the central through hole of the inner push rod 3, and the medicine box 6 presses against the stepped portion 3.1 of the central through hole of the inner push rod 3.

[0035] The end cap 4 is a screw cap. The upper circumferential outer wall of the base body 1 is threaded to form a thread. The end cap 4 is screwed onto the upper part of the base body 1, so that the top of the end cap 4 covers the upper end face of the base body 1 where the upper end cavity of the large diameter section of the central through cavity 1.1 is located. Thus, the upper end openings of the large diameter section of the central through hole of the outer push rod 2 and the inner push rod 3 are both sealed by the end cap 4. The ignition element 5 is installed at the center of the top of the end cap 4, and the ignition part of the ignition element 5 extends downward into the large diameter section of the central through hole of the inner push rod 3 and is aligned with the medicine box 6.

[0036] like Figure 7 As shown, end plate 7 is connected to the lower axial end face of base 1 by axial bolts 9. The upper side surface of end plate 7 has an annular groove, and the center of the annular groove has a central protrusion 7.1. The outer diameter of the central protrusion 7.1 matches the diameter of the small diameter section of the central through hole of the inner push rod 3. The lower axial ends of the outer push rod 2 and the inner push rod 3 are both inserted into the annular groove on the upper side surface of end plate 7 and contact the bottom of the annular groove. The central protrusion 7.1 of end plate 7 is inserted into the small diameter section of the central through hole of the inner push rod 3, and the upper end of the central protrusion 7.1 contacts the bottom of the medicine box 6.

[0037] like Figure 6 As shown in this embodiment, the bolt 9 used to connect the end plate 7 has V-shaped grooves 9.1 on two symmetrical sides. The V-shaped grooves 9.1 ensure the connection strength while ensuring that the bolt 9 can be broken in time when the end plate 7 is under force.

[0038] In this embodiment, as shown Figure 1 As shown, taking the gap between the outer wall step 2.2 of the outer push rod 2 and the central cavity 1.1 step 1.2 of the seat body 1 as an example, where the gap 10 between the outer wall step 3.1 of the inner push rod 3 and the central hole step 2.1 of the outer push rod 2 is not filled with the stroke adjustment piece 8, the outer push rod 3 cannot move in the central cavity 1.1 of the seat body 1, and the inner push rod 3 can achieve the maximum stroke in the central hole of the outer push rod 2. In this situation, after the igniter 5 is ignited, the powder box 6 burns rapidly. The outer push rod 2 cannot move within the central cavity 1.1 of the base 1, while the inner push rod 3 can achieve its maximum stroke within the central through hole of the outer push rod 2. At this time, under the pressure generated by the gas expansion, the lower end of the inner push rod 3 passes through the lower end of the central through hole of the outer push rod 3 and acts on the end plate 7, causing the bolt 9 to break at the V-groove 9.1. As a result, the inner push rod 3 and the end plate 7 move downward as a whole, and the inner push rod 3 can extend its maximum length from the central through hole of the outer push rod 2, forming a stroke as follows: Figure 8 As shown.

[0039] When it is necessary to increase the adjustment stroke, the number of stroke adjustment pieces 8 in the gap between the outer wall step 2.2 of the outer push rod 2 and the central cavity 1.1 step 1.2 of the seat body 1 can be reduced, freeing up space in the central cavity 1.1 of the seat body 1 for the outer push rod 2 to move, thereby increasing the stroke. When all the stroke adjustment pieces 8 in the gap between the outer wall step 2.2 of the outer push rod 2 and the central cavity 1.1 step 1.2 of the seat body 1 are removed, the outer push rod 3 can achieve its maximum stroke within the central cavity 1.1 of the seat body 1, while the inner push rod 3 can achieve its maximum stroke within the central through hole of the outer push rod 2, thus forming the maximum stroke of the electric actuator. The electric actuator at its maximum stroke is as follows: Figure 9 As shown, the outer push rod 3 can extend its maximum length from the central cavity 1.1 of the seat body 1, and the inner push rod 2 can extend its maximum length from the central through hole of the outer push rod 3.

[0040] When it is necessary to reduce the adjustment stroke, a stroke adjustment piece 8 can be added to the gap 10 between the inner push rod 3's outer wall step 3.1 and the outer push rod 2's central through hole step 2.1 to reduce the movement space of the inner push rod 3, thereby reducing the adjustment stroke.

[0041] When it is necessary to add or reduce the stroke adjustment piece 8, after unscrewing the end cover 4, the outer push rod 2 can be pulled out from the central cavity 1.1 of the seat body 1, and the inner push rod 3 can be pulled out from the central through hole of the outer push rod 2. After adding or reducing the stroke adjustment piece 8, it can be reassembled and reset.

[0042] It should be noted that although this embodiment is illustrated using a two-layer push rod as an example, any technical solution that uses this embodiment and has two or more layers of push rods to expand the overall stroke of the electric actuator should also be considered to fall within the scope of protection of this patent.

[0043] Furthermore, although this embodiment is described with the gap between the outer wall step 2.2 of the outer push rod 2 and the central cavity 1.1 step 1.2 of the seat body 1 filled with the stroke adjustment piece 8, and the gap 10 between the inner push rod 3 and the central hole of the outer push rod 2 not filled with the stroke adjustment piece 8, other filling methods of the stroke adjustment piece 8 should also be considered to fall within the scope of protection of this patent.

[0044] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. These embodiments are merely descriptions of preferred embodiments and are not intended to limit the scope or concept of the invention. The specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. Such combinations, as long as they do not violate the spirit of the present invention, should also be considered as part of this disclosure. To avoid unnecessary repetition, the present invention will not further describe the various possible combinations.

[0045] This invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this invention and without departing from the design idea of ​​this invention, all modifications and improvements made by those skilled in the art to the technical solutions of this invention should fall within the protection scope of this invention. The technical content for which protection is sought in this invention has been fully described in the claims.

Claims

1. An electric actuator with adjustable stroke in stages, characterized in that, It includes a base (1), a push rod assembly, an end cap (4), an ignition element (5), a medicine box (6), and an end plate (7); the base (1) has a central cavity (1.1) inside, which is a stepped cavity with a stepped part. The stepped part divides the central cavity (1.1) into two sections, one of which is a large diameter section and the other is a small diameter section; The push rod assembly includes multiple layers of push rods from the inside out. Each push rod has a central through hole, which is a stepped through hole with a stepped portion. The stepped portion divides the central through hole of each push rod into two sections, one of which is a large-diameter section and the other of which is a small-diameter section. The circumferential outer wall of each push rod is a stepped outer wall with a stepped portion, which divides the circumferential outer wall of each push rod into two sections, one of which is a large outer diameter section and the other of which is a small outer diameter section. In two adjacent push rods, the outer diameter of the large outer diameter section of the circumferential outer wall of the inner push rod matches the diameter of the large diameter section of the central through hole of the outer push rod, and the outer diameter of the small outer diameter section of the circumferential outer wall of the inner push rod matches the diameter of the small diameter section of the central through hole of the outer push rod. In two adjacent push rods, the inner push rod is coaxially installed in the central through hole of the outer push rod. The entire large outer diameter section of the circumferential outer wall of the inner push rod is located within the large diameter section of the central through hole of the outer push rod, and a portion of the small outer diameter section of the circumferential outer wall of the inner push rod is located within the small diameter section of the central through hole of the outer push rod. Furthermore, there is a gap formed by an axial distance between the stepped portion of the circumferential outer wall of the inner push rod and the stepped portion of the central through hole of the outer push rod. In the push rod assembly, the outer diameter of the outermost push rod's circumferential outer wall with a large outer diameter section matches the diameter of the large diameter section of the central cavity (1.1) of the seat body (1), and the outer diameter of the outermost push rod's circumferential outer wall with a small outer diameter section matches the diameter of the small diameter section of the central cavity (1.1) of the seat body (1); the push rod assembly is coaxially installed in the central cavity (1.1) of the seat body (1), the entire outermost push rod's circumferential outer wall with a large outer diameter section is located within the large diameter section of the central cavity (1.1) of the seat body (1), a portion of the outermost push rod's circumferential outer wall with a small outer diameter section is located within the small diameter section of the central cavity (1.1) of the seat body (1), and a gap is formed between the stepped portion of the outermost push rod's circumferential outer wall and the stepped portion of the central cavity (1.1) of the seat body (1) by a certain distance in the axial direction; and the opening of the large diameter section of the central through hole of each push rod is flush with the opening of the large diameter section of the central cavity (1.1) of the seat body (1); The gap formed between the outermost push rod circumferential outer wall step and the central cavity (1.1) step of the seat (1), and the gap formed between the inner push rod circumferential outer wall step and the outer push rod central through hole in the two adjacent push rods, at least one gap is filled with one or more stroke adjustment pieces (8), and when the gap is filled with multiple stroke adjustment pieces (8), each stroke adjustment piece (8) is arranged axially in the gap; The medicine box (6) is located in the large-diameter section of the central through hole of the innermost push rod in the push rod assembly; The end cap (4) covers the axial end face of the seat body (1) where the cavity opening of the large diameter section of the central through cavity (1.1) of the seat body (1) is located, thereby sealing the opening of the large diameter section of the central through hole of each push rod by the end cap (4); the igniter (5) is installed on the end cap (4), and the ignition part of the igniter (5) extends into the central through hole of the innermost push rod of the push rod assembly and is aligned with the medicine box (6). The end plate (7) covers the other end face of the seat (1) in the axial direction, and the other end of at least one push rod in the push rod assembly is in contact with the end plate (7).

2. The electric actuator with adjustable stroke according to claim 1, characterized in that, The end cap (4) is a screw cap, which is screwed onto one end of the axial direction of the seat body (1) where the cavity opening of the large diameter section of the central cavity (1.1) of the seat body (1) is located.

3. The electric actuator with adjustable stroke according to claim 1, characterized in that, The end plate (7) is connected to the other end face of the seat (1) by bolts (9), and a section of the bolt (9) has V-shaped grooves (9.1) on two symmetrical sides.

4. The electric actuator with adjustable stroke according to claim 1, characterized in that, The stroke adjustment piece (8) has a ring structure.

5. The electric actuator with adjustable stroke according to claim 1, characterized in that, The outer diameter of the medicine box (6) matches the diameter of the large-diameter section of the central through hole of the innermost push rod.

6. An electric actuator with adjustable stroke according to claim 1 or 5, characterized in that, The end plate (7) has a central protrusion. The outer diameter of the central protrusion of the end plate (7) matches the diameter of the small diameter section of the central through hole of the innermost push rod. The central protrusion of the end plate (7) penetrates into the small diameter section of the central through hole of the innermost push rod.

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