A hydraulic reset tool

Abstract

The present invention provides a hydraulic reset tool for resetting a memory metal tube driver, which mainly includes a hydraulic pump, a jack, a reset base, a reset upper pressure block, a load-bearing frame, a hydraulic gauge, a dial indicator and a base plate. The hydraulic pump and the load-bearing frame are fixed on the base plate, the jack is fixed on the lower cover plate of the load-bearing frame, and the reset upper pressure block is fixed on the upper cover plate of the load-bearing frame; the hydraulic pump provides hydraulic pressure to the jack, and the reset base and the memory metal tube are placed between the jack and the reset upper pressure block. When in use, the hydraulic pump drives the jack and the reset base to move upward, causing the memory metal tube to be axially compressed and shortened, thereby achieving reset. During the reset process, the hydraulic pressure and the longitudinal displacement of the reset base are monitored respectively by the hydraulic gauge and the dial indicator, so that the reset load and axial compression of the memory metal tube can be accurately controlled. The present invention has a compact structure, is easy to operate, and the reset load and axial compression of the memory metal tube can be precisely controlled.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic machinery, in particular to a hydraulic device for resetting a memory metal tube. Background Art

[0002] As a new type of driving element, the memory metal driver has the characteristics of being clean, flexible, and fast, and has developed rapidly in the fields of aerospace, industrial automation control, etc. Among them, the memory metal tube driver has been widely used in the field of large-load release technology for spacecraft due to its advantages of large driving force (up to tens of thousands of Newtons), smooth driving, and reusability. In order to make the memory metal tube driver have driving ability, it is necessary to reset the memory metal tube in the driver before use, that is, to apply an axial compression load to make the memory metal tube produce a certain amount of axial compression. The existing technology often uses a tensile testing machine to perform the reset operation of the memory metal tube. However, this method is costly, the operation process is cumbersome, and the tensile testing machine is relatively bulky, which is not convenient for resetting the tube driver after field testing or cyclic testing. Summary of the Invention

[0003] The present invention mainly addresses the problems existing in the prior art of memory metal tube drivers, such as complex reset device structure, cumbersome reset operation, and inconvenience in field testing. It provides a reset device with a simple structure, easy operation, large reset load, and the ability to accurately control the reset load and axial compression.

[0004] The technical solution adopted by the present invention is: a hydraulic reset tool, which includes a hydraulic pump, a jack, a reset base, a reset upper pressure block, a load-bearing frame, a hydraulic gauge, a dial indicator, a base plate, and connecting pipes. The hydraulic pump and the load-bearing frame are fixed to the base plate; the load-bearing frame consists of an upper cover plate, a lower cover plate, and a load-bearing column; the jack is fixed to the lower cover plate of the load-bearing frame, and the reset upper pressure block is fixed to the upper cover plate of the load-bearing frame; the hydraulic pressure provided by the hydraulic pump is transmitted to the jack via connecting pipes, and the memory metal tube to be reset is assembled with the reset base and placed between the jack and the reset upper pressure block. During use, the hydraulic pump drives the jack and reset base upward, causing the memory metal tube to be axially compressed and shortened, thereby achieving reset. In addition, a hydraulic gauge is installed on the connecting pipe to monitor the hydraulic pressure in real time, and a dial indicator is installed on the top of the load-bearing frame to monitor the displacement of the jack in real time. As a result, the reset load and axial compression of the memory metal tube during the reset process can be accurately controlled.

[0005] Furthermore, the reset base is an inverted T-shaped structure, the upper end of which is a long cylindrical structure, the diameter of the long cylinder is smaller than the inner diameter of the memory metal tube, and the height is lower than the length of the memory metal tube after reset.

[0006] Furthermore, the memory metal tube is sleeved outside the long cylinder of the reset base, and the top end thereof abuts against the lower surface of the reset upper pressing block, thereby the memory metal tube is completely restricted by the reset base and the reset upper pressing block.

[0007] Furthermore, a circular hole is provided at the lower end of the reset base, and a strong magnetic magnet is fixed in the hole to determine the position of the reset base on the jack.

[0008] Furthermore, the upper cover plate, the lower cover plate and the load-bearing columns of the load-bearing frame are all made of steel, which can ensure that no deformation occurs during the resetting process.

[0009] Furthermore, the hydraulic gauge is installed on the connecting pipeline between the hydraulic pump and the jack. For a memory metal tube driver with a driving load greater than 10,000 N, the range of the hydraulic gauge is 20 MPa, and the minimum graduation value is ≤0.5 MPa.

[0010] Furthermore, after the measuring needle of the dial indicator passes through the through hole of the upper cover plate of the load-bearing frame and the central hole of the reset upper pressing block, it contacts the top of the long cylinder of the reset base.

[0011] The hydraulic reset tool provided by the present invention has the advantages of simple structure, easy operation, and controllable reset process, which are specifically manifested in the following aspects.

[0012] (1) The hydraulic reset fixture of the present invention has a compact structure and is suitable for field tests or situations where operating space is limited.

[0013] (2) The hydraulic reset tooling of the present invention is easy to operate and can greatly improve the efficiency of resetting the memory metal tube and testing the performance of the driver.

[0014] (3) The hydraulic reset tooling of the present invention monitors the hydraulic pressure and longitudinal displacement during the reset process through a hydraulic gauge and a dial indicator, respectively, thereby achieving precise control of the reset load and axial compression amount of the memory metal tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic diagram of the overall structure of the present invention; wherein FIG1(a) is an axonometric view, FIG1(b) is a front view; and FIG1(c) is a top view;

[0016] Figure 2 It is a structural schematic diagram of the reset base of the present invention;

[0017] FIG3 is a schematic diagram of the structure and assembly of the load-bearing frame portion of the present invention; FIG3(a) is an axonometric view, and FIG3(b) is a cross-sectional view;

[0018] Explanation of the accompanying symbols: 1. Hydraulic pump; 2. Jack; 3. Reset base; 4. Memory metal tube; 5. Reset upper pressure block; 6. Load-bearing frame; 7. Hydraulic gauge; 8. Dial indicator; 9. Base plate; 10. Connecting pipes; 301. Long cylinder; 302. Round hole; 303. Strong magnetic magnet; 601. Lower cover; 602. Load-bearing column; 603. Upper cover. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] The overall structure of the hydraulic reset tooling of the present invention is shown in Figure 1. The hydraulic pump 1 and the load-bearing frame 6 are fixed on the base plate 9. The jack 2, the reset base 3, the memory metal tube 4 and the reset upper pressure block 5 are installed from bottom to top in the load-bearing frame 6. The hydraulic pump 1 transmits the hydraulic pressure to the jack 2 through the connecting pipe 10. The jack 2 pushes the reset base 3 to move upward and compress the memory metal tube 4, thereby realizing the reset of the memory metal tube 4; the hydraulic gauge 7 is installed on the connecting pipe 10 for real-time monitoring of the hydraulic pressure, and then controlling the reset pressure load size; the dial indicator 8 is installed on the top of the load-bearing frame 6 for real-time display of the longitudinal displacement of the reset base 3, and then controlling the axial compression of the memory metal tube 4.

[0021] The structure of the reset base 3 of the present invention is as follows Figure 2 As shown, it is an inverted T-shaped cylindrical structure, with an elongated cylinder 301 at the upper end. The diameter of the elongated cylinder 301 is smaller than the inner diameter of the memory metal tube 4, and the height is lower than the length of the memory metal tube 4 after reset. A circular hole 302 is provided at the lower end of the reset base 3, and a strong magnetic magnet 303 is fixed in the hole to determine the position of the reset base 3 on the jack 2.

[0022] The structure of the load-bearing frame 6 of the present invention is shown in Figure 3, which is composed of a lower cover plate 601, a load-bearing column 602 and an upper cover plate 603. The lower cover plate 601 is fixed on the base plate 9, and the upper cover plate 603 is connected to the lower cover plate 601 through a plurality of load-bearing columns 602. The jack 2 is fixed on the lower cover plate 601, the reset upper pressure block 5 is fixedly connected to the upper cover plate 603, and the memory metal tube 4 is sleeved on the outside of the long cylinder 301 of the reset base 3. The sleeved memory metal tube 4 and the reset base 3 are placed between the jack 2 and the reset upper pressure block 5; the probe of the dial indicator 8 passes downward through the through hole on the upper cover plate 603 and the center hole of the reset upper pressure block 5 and contacts the top of the long cylinder 301. By measuring the displacement of the reset base 3, the axial compression of the memory metal tube 4 can be monitored in real time.

[0023] Parts not disclosed in detail in the present invention belong to the common knowledge in the art. In addition, it can be understood that the hydraulic pump 1, jack 2, hydraulic gauge 7 and dial indicator 8 in the present invention are all standard components in the art.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic reset tool, characterized in that: It comprises a hydraulic pump (1), a jack (2), a reset base (3), a reset upper pressure block (5), a load-bearing frame (6), a bottom plate (9) and a connecting pipeline (10); The hydraulic pump (1) and the load-bearing frame (6) are fixed on the bottom plate (9); the hydraulic pressure provided by the hydraulic pump (1) is transmitted to the jack (2) through the connecting pipe (10); the load-bearing frame (6) is composed of an upper cover plate, a lower cover plate and a load-bearing column; the jack (2) is fixed on the lower cover plate of the load-bearing frame (6); the reset upper pressure block (5) is fixed on the upper cover plate of the load-bearing frame (6); the memory metal tube (4) to be reset is assembled with the reset base (3) and placed between the jack (2) and the reset upper pressure block (5); the hydraulic pump (1) drives the jack (2) and the reset base (3) to move upwards and compress the memory metal tube (4), thereby achieving the reset of the memory metal tube (4).

2. The hydraulic reset tool according to claim 1, characterized in that: The connecting pipeline (10) is equipped with a hydraulic gauge (7) capable of monitoring the hydraulic pressure in real time.

3. The hydraulic reset tool according to claim 1, characterized in that: The reset base (3) is an inverted T-shaped structure, with an upper end being a long cylinder (301); the diameter of the long cylinder (301) is smaller than the inner diameter of the memory metal tube (4), and the height is lower than the length of the memory metal tube (4) after reset; when resetting, the memory metal tube (4) is sleeved outside the long cylinder (301).

4. The hydraulic reset tool according to claim 3, characterized in that: A dial indicator (8) is installed on the top of the upper cover of the load-bearing frame (6). The measuring needle of the dial indicator (8) passes through the through hole of the upper cover of the load-bearing frame (6) and the center hole of the reset upper pressure block (5) and contacts the top of the long cylinder (301) of the reset base (3), so as to monitor the axial compression amount of the memory metal tube (4) in real time.

5. The hydraulic reset tool according to claim 1 or 3, characterized in that: The lower end of the reset base (3) is provided with a circular hole (302), in which a strong magnetic magnet (303) is fixed for determining the position of the reset base (3) on the jack (2).

6. The hydraulic reset tool according to claim 1, characterized in that: The upper cover plate, the lower cover plate and the load-bearing columns of the load-bearing frame (6) must be made of steel to ensure that no deformation occurs during the resetting process.

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