Servo mechanism locking device capable of satisfying level test of simple pendulum engine

Abstract

The invention relates to a servo mechanism locking device capable of meeting the horizontal test of a simple pendulum engine. The device comprises an upper sleeve, a lower sleeve and a support ring, the upper sleeve and the lower sleeve are used in pairs and can be assembled in an up-down butt clamping mode, one end of the upper sleeve and one end of the lower sleeve are assembled into a cylindrical structure and used for tightly holding the outer wall of an actuating cylinder of a hydraulic actuator of the servo mechanism, and after the other end of the upper sleeve and the other end of the lower sleeve are assembled, two grooves with annular holes are formed and used for being fixedly connected with a pin shaft and tightly holding the pin shaft. One end of the front supporting lug is connected to a piston rod of a hydraulic actuator of the servo mechanism in a threaded connection mode, the other end of the front supporting lug is arranged on the pin shaft in a sleeving mode and can rotate around the pin shaft, and the pin shaft is connected with an engine at the same time to achieve output and transmission of motion. A piston rod of a hydraulic actuator of the servo mechanism moves relative to an actuating cylinder, when the piston rod stretches out and draws back in the installation direction, the small ends of an upper sleeve and a lower sleeve do not move relative to a pin shaft, and the large ends of the upper sleeve and the lower sleeve move relative to the actuating cylinder.

Description

Technical Field

[0001] The invention relates to a locking device of a servo mechanism, in particular to a locking device of a servo mechanism that meets the requirements of a single-pendulum engine horizontal test, and belongs to the field of aerospace equipment. Background Art

[0002] In order to improve the efficiency of rocket launches and shorten the working time in the field, a production model of horizontal testing, horizontal transportation and vertical launch of rockets has been proposed, that is, all products are assembled in the final assembly plant, and the factory test is completed in a horizontal position, and then transported horizontally to the launch plant, which is different from the current model of installing the engine and servo mechanism after the rocket is erected. In this mode, the servo mechanism and the engine are installed with the rocket body, and the functional test of the servo mechanism is completed in the horizontal state of the rocket body, and the servo mechanism needs to have the ability to support the engine and be transported horizontally with the rocket body to the launch site without launching the arrow after the test is completed. Generally, the structural space of the rocket engine and servo mechanism installation section is tight. Therefore, in order to ensure the safety of the engine, whether in the horizontal test process or the horizontal transportation process, the servo mechanism is required to have a reliable locking position limitation capability. Therefore, it is necessary to design a special device that can meet the functional test of the servo mechanism swinging the engine in the horizontal state, and can also support and limit the engine during the horizontal transportation of the entire rocket.

[0003] At present, the locking of the servo mechanism of hydraulic transmission includes the scheme of using a neutral clamp and a hydraulic lock. The scheme of the hydraulic lock is to set a hydraulic lock in the hydraulic circuit, which can realize the cutoff of the oil circuit while unloading the high-pressure oil in the hydraulic circuit, and then realize the position locking of the actuator. However, this locking scheme has the risk of slow oil leakage in the hydraulic oil circuit. When the actuator is subjected to long-term alternating loads, the hydraulic lock has a high risk of oil leakage. Therefore, it is impossible to ensure the reliability of the servo mechanism to support the engine position for a long time when the rocket body is transported horizontally. Therefore, designing a mechanical locking device is the preferred solution to ensure the reliable position locking of the servo mechanism.

[0004] Patent CN201410602156.7 proposes a quick-disassembly and adjustable zero-position locking mechanism, which adopts a solution of connecting a fixed clamp and an adjusting clamp in series to achieve the zero-position locking of the servo mechanism. It can meet the zero-position locking of servo mechanisms with different zero positions and has a certain degree of versatility. However, the locking clamp is mainly designed for the zero-position locking of the servo mechanism and does not have the ability to release the freedom of the piston rod's telescopic movement during servo mechanism testing. Summary of the invention

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a servo mechanism locking device that can meet the needs of horizontal testing and horizontal transportation of a single pendulum engine, and to solve the engine locking and limiting problems during horizontal testing and horizontal transportation of a rocket.

[0006] The solution to the technical problem of the present invention is: the servo mechanism is connected to the engine through a pin shaft, specifically: the piston rod of the servo mechanism hydraulic actuator is fixedly connected to the front support ear, the other end of the front support ear is sleeved on the pin shaft and can rotate around the pin shaft, the pin shaft is connected to the engine at the same time to realize the output and transmission of motion, and the servo mechanism locking device includes an upper sleeve and a lower sleeve;

[0007] The upper sleeve and the lower sleeve are used in pairs and can be assembled by clamping up and down. One end is assembled into a cylindrical structure for holding the outer wall of the actuator cylinder of the hydraulic actuator of the servo mechanism. After the other end is assembled, two ears with annular holes extend out for fixed connection with the two ends of the pin shaft to hold the pin shaft.

[0008] The piston rod and the actuator cylinder of the hydraulic actuator of the servo mechanism have relative movement. When the piston rod performs telescopic movement in the installation direction, the small ends of the upper sleeve and the lower sleeve and the pin shaft have no relative movement, and the large ends of the upper sleeve and the lower sleeve and the actuator cylinder have relative movement.

[0009] Preferably, the servo mechanism locking device that meets the single pendulum engine horizontal test also includes a support ring; arc grooves are provided on the upper sleeve and the lower sleeve, and after the two are spliced ​​together, an annular groove is formed on the inner wall.

[0010] The support ring is installed in the ring groove formed by the upper sleeve and the lower sleeve, located on the large end side of the locking device, and tightly holds the outer wall of the actuator cylinder.

[0011] Preferably, the outer wall of the actuating cylinder is provided with a limiting step structure for limiting the displacement of the upper sleeve and the lower sleeve.

[0012] Preferably, the support ring is made of non-metallic material.

[0013] Preferably, there are two support rings arranged at intervals.

[0014] The beneficial effects of the present invention compared with the prior art are:

[0015] (1) The present invention adopts a simple mechanical structure to solve the locking and limiting problems of the servo mechanism of the single pendulum engine during horizontal testing and horizontal transportation, ensuring the safety and reliability of the product.

[0016] (2) The locking device of the present invention does not need to be disassembled during the entire process of horizontal testing and horizontal transportation, which solves the problem that traditional fixtures must be disassembled during testing and greatly improves work efficiency.

[0017] (3) The locking device of the present invention can realize universal testing of various products by adjusting the limit displacement, and has high utilization efficiency.

[0018] (4) The locking device of the present invention is provided with a non-metallic structure of the support ring, which avoids mutual friction and wear between metals, increases the service life, and protects the appearance of the product.

[0019] (5) The locking device solves the problem of lateral force on the piston rod during horizontal transportation and horizontal testing, and improves the sealing reliability of the actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a simplified installation diagram of the device according to the embodiment of the present invention;

[0021] Figure 2 This is an exploded view of the installation of the device according to the embodiment of the present invention;

[0022] Figure 3 A schematic diagram of a device in an embodiment of the present invention;

[0023] Figure 4 An exploded view of a device in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the working example of the present invention;

[0025] Figure 6 This is a schematic diagram of the working example of the present invention;

[0026] Figure 7 It is a force analysis and stroke diagram in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the embodiments.

[0028] Example 1

[0029] like Figure 1 , 2 As shown, the servo mechanism locking device 10 of the present invention is installed on the outside of the servo mechanism hydraulic actuator 11, and the locking device 10 is connected to the hydraulic actuator 11 by clamping the upper and lower structures.

[0030] like Figure 3 , 4 As shown, the servo mechanism locking device of the present invention comprises an upper sleeve 1, a lower sleeve 2, a support ring 3, a pin 7, and a front support ear 6. The upper sleeve 1 and the lower sleeve 2 are used in pairs and can be assembled by clamping up and down. One end is assembled into a cylindrical structure for holding the outer wall of the actuator cylinder of the hydraulic actuator 11 of the servo mechanism. After the other end is assembled, two support ears with annular holes extend out for fixed connection with the pin 7 to hold the pin 7;

[0031] like Figure 5 , Figure 6 As shown, the large ends of the upper sleeve 1 and the lower sleeve 2 hold the outer wall of the actuator 4, and the small ends of the upper sleeve 1 and the lower sleeve 2 hold the pin 7. One end of the front support ear 6 is connected to the piston rod of the servo mechanism hydraulic actuator by a threaded connection, and the other end of the front support ear is sleeved on the pin 7 and can rotate around the pin. The pin is also connected to the engine 8 to achieve the output and transmission of motion.

[0032] There is relative movement between the piston rod 5 and the actuator cylinder 4, and the piston rod 5 can perform telescopic movement in the installation direction. The small ends of the upper sleeve 1 and the lower sleeve 2 and the pin 7 are fixedly connected and have no relative movement; the large ends of the upper sleeve 1 and the lower sleeve 2 and the actuator cylinder 4 have relative movement, and the support ring 3 is made of non-metallic material (such as polytetrafluoroethylene, polyetheretherketone, glass fiber, etc.), which avoids mechanical contact between the upper sleeve 1 and the lower sleeve 2 and the actuator cylinder 4 and improves the reliability of relative movement.

[0033] The upper sleeve 1 and the lower sleeve 2 are provided with arc grooves. After the two are spliced ​​together, an annular groove is formed on the inner wall. The support ring 3 is installed in the annular groove formed by the upper sleeve 1 and the lower sleeve 2, located on the large end side of the locking device, and tightly holds the outer wall of the actuator cylinder 4.

[0034] like Figure 7 As shown, the outer wall of the actuator is provided with a limiting step structure for limiting the displacement of the upper sleeve 1 and the lower sleeve 2. The schematic diagram of the movement and force of the locking device of the present invention, wherein L1 is the limiting length in the retracting direction of the actuator, and L2 is the limiting length in the extending direction of the actuator. The limiting of the stroke of the actuator is achieved by adjusting the lengths of L1 and L2, thereby ensuring the protection of the servo mechanism at the extreme position during horizontal testing and horizontal transportation, ensuring that the engine will not collide under various working conditions, and ensuring the safety and reliability of the product. The locking device of the present invention is subjected to structural force, so that the piston rod 5 is not affected by other lateral forces during horizontal testing and horizontal transportation, avoiding stress on the sealing ring between the actuator 4 and the piston rod 5, and improving the sealing reliability and working reliability of the hydraulic actuator, wherein F1 is the interaction force between the pin 7 and the locking device, and F2 and F3 are the interaction forces between the actuator 4 and the locking device.

[0035] The axis of the pin 7 is perpendicular to the axis of the piston rod. Since the locking device of the present invention is fixedly connected to the pin 7, the servo mechanism can only rotate around the pin, and the movement of the servo mechanism parallel to the pin is limited. Therefore, the locking device is suitable for horizontal testing of a single pendulum engine.

[0036] In summary, the present invention has the following characteristics:

[0037] (1) A split sleeve structure is adopted to support the servo mechanism support ear pin and the actuator, so as to realize the coaxial support of the servo mechanism piston rod and the actuator, avoid radial force between the servo mechanism piston rod and the actuator during the horizontal transportation of the servo mechanism supporting the engine with the arrow, and protect the reliability of the linear seal at the end of the actuator.

[0038] (2) A limit step structure is designed on one side of the actuator cylinder of the split sleeve to ensure that when the servo mechanism supports the engine and is placed horizontally with the rocket body during transportation, if there is internal leakage in the servo mechanism's own hydraulic lock and relative displacement of the piston rod relative to the actuator cylinder occurs, the mechanical structure is limited to ensure that the engine does not collide with the rocket body.

[0039] (3) The split sleeve is designed with two support rings on one side of the actuator to enable the servo mechanism to play a guiding and supporting role during the movement of the piston rod and the locking device when the servo mechanism supports the engine in a horizontal state with the rocket body during testing.

[0040] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A servo mechanism locking device that meets the single pendulum engine level test, characterized in that The servo mechanism is connected to the engine through a pin shaft, specifically: the piston rod of the servo mechanism hydraulic actuator is fixedly connected to the front support ear (6), the other end of the front support ear (6) is sleeved on the pin shaft (7) and can rotate around the pin shaft, and the pin shaft is connected to the engine (8) at the same time to realize the output and transmission of motion, and the servo mechanism locking device includes an upper sleeve (1) and a lower sleeve (2); The upper sleeve (1) and the lower sleeve (2) are used in pairs and can be assembled by clamping up and down. One end is assembled into a cylindrical structure for holding the outer wall of the actuator cylinder of the hydraulic actuator (11) of the servo mechanism. After the other end is assembled, two ears with annular holes extend out for fixed connection with the two ends of the pin shaft (7) to hold the pin shaft (7). The piston rod (5) of the hydraulic actuator (11) of the servo mechanism and the actuator cylinder (4) have relative movement. When the piston rod (5) performs telescopic movement in the installation direction, the small ends of the upper sleeve (1) and the lower sleeve (2) and the pin shaft (7) do not have relative movement, while the large ends of the upper sleeve (1) and the lower sleeve (2) and the actuator cylinder (4) have relative movement.

2. A servo mechanism locking device that meets the single pendulum engine level test according to claim 1, characterized in that It also includes a support ring (3); an arc groove is provided on the upper sleeve (1) and the lower sleeve (2); after the two are spliced ​​together, an annular groove is formed on the inner wall; The support ring (3) is installed in the ring groove formed by the upper sleeve (1) and the lower sleeve (2), located on the large end side of the locking device, and tightly holds the outer wall of the actuator cylinder (4).

3. A servo mechanism locking device that meets the single pendulum engine level test according to claim 1, characterized in that: The outer wall of the actuating cylinder is provided with a limiting step structure for limiting the displacement of the upper sleeve (1) and the lower sleeve (2).

4. A servo mechanism locking device that meets the single pendulum engine level test according to claim 1, characterized in that: The support ring (3) is made of non-metallic material.

5. A servo mechanism locking device that meets the single pendulum engine level test according to claim 1, characterized in that: There are two support rings (3) arranged at intervals.

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