A flat spiral spring mechanism static and dynamic performance test system

Abstract

The present application relates to a kind of flat scroll spring mechanism static and dynamic performance test test system, comprising: test module, screwing module, locking module, camera module;The bottom of test module has fixed platform, the rear side of fixed platform is equipped with screwing module, the left side of fixed platform is equipped with locking module, the right side of fixed platform is equipped with camera module.This test system adopts high-precision angle sensor and torque sensor combination design, can realize the accurate acquisition of the rotation angle, torque etc. data of scroll spring screwing process;Using high-resolution high-speed dynamic optical measurement method, the accurate acquisition of stress, strain distribution and evolution law of scroll spring screwing, bearing and deployment process can be realized;Using high-speed camera device, the accurate acquisition of deployment time, deployment angular velocity etc. dynamic performance of scroll spring deployment process can be realized.

Description

Technical Field

[0001] This invention relates to a static and dynamic performance testing system for a planar spiral spring mechanism, belonging to the field of launch vehicle technology. Background Technology

[0002] A planar spiral spring is a spring made by winding a slender spring material into a planar helical shape. In launch vehicle separation mechanisms, planar spiral springs are often used to achieve radial locking and load-bearing of internal components. During unlocking and separation, the spring force of the spiral spring is used to achieve a slow release. Contact-type planar spiral springs have a large number of coils and can store a significant amount of energy. However, since adjacent coils are in contact, their static load-bearing capacity and dynamic deployment performance are mainly determined by the complex interface friction characteristics of each coil. Theoretical calculations often differ significantly from actual performance, necessitating experimental testing.

[0003] Currently, testing systems for planar spiral spring mechanisms can generally only measure macroscopic characteristics such as torsional torque, making it difficult to obtain microscopic distribution characteristics such as stress and strain of the spiral spring. This makes it difficult to accurately analyze the static and dynamic performance of the spiral spring and provide support for mechanism design. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of the existing technology, this invention proposes a static and dynamic performance testing system for planar spiral spring mechanisms, in order to accurately acquire and analyze the static load-bearing capacity and dynamic deployment performance of spiral springs.

[0006] (II) Technical Solution

[0007] A static and dynamic performance testing system for a planar spiral spring mechanism includes: a test module, a tightening module, a locking module, and a camera module; the test module has a fixed platform at its bottom, a tightening module is located at the rear of the fixed platform, a locking module is located on the left side of the fixed platform, and a camera module is located on the right side of the fixed platform; the testing system can perform different tests: the test module and the tightening module work together to perform tightening and unfolding tests on the spiral spring under test; after the spiral spring is tightened, it is locked by the locking module to perform static load-bearing performance tests on the spiral spring under test; after removing the tightening module, the locking module and the camera module work together to perform dynamic unfolding performance tests on the spiral spring under test.

[0008] The tested module includes: a fixed platform, a base, a segmented nut, a spiral spring, a turntable, a housing, a loading bolt, a fiber optic grating sensor, a bearing, an inner positioning shoulder and an elastic retaining ring, and an outer positioning shoulder and an elastic retaining ring. The base is fixedly mounted on the fixed platform by several longitudinal connecting bolts. The fixed platform and the base are provided with coaxial longitudinal through holes. The loading bolt passes through the longitudinal through holes and is threadedly connected to the segmented nut. A spiral spring is sleeved on the outer periphery of the segmented nut. The inner end of the spiral spring is fixedly connected to the outer periphery of the segmented nut, and the outer end of the spiral spring is fixedly connected to the inner side of the turntable. The inner surface of the spiral spring strip... A strip-shaped groove is provided, within which a series of fiber Bragg grating sensors are arranged. The wires of the fiber Bragg grating sensors are led out from the inner end and connected to the fiber optic demodulation equipment. An inner positioning shoulder and an elastic retaining ring are provided on the outer side of the turntable, and an outer positioning shoulder and an elastic retaining ring are provided on the inner side of the cylindrical shell. The inner and outer positioning shoulders and elastic retaining rings are arranged at an angle, and a bearing is used to limit and lock them together. The shell is fitted onto the positioning boss of the base, and the outer side of the shell is fixed to the base by several radial connecting bolts. When the loading bolt is rotated, the split nut moves radially and drives the spiral spring to tighten or unfold.

[0009] The segments on the split nut are arranged longitudinally with the same center, and radial positioning is achieved through radial guide grooves and guide bosses on the base; the outer wall of the split nut is provided with a groove slightly wider than the spiral spring to prevent the spiral spring from moving axially.

[0010] A buffer device and a capture device are placed below the loading bolt. When the spiral spring unfolds and the split nut separates, the falling loading bolt is captured.

[0011] The tightening module includes: a tightening module bracket, a motor base, a torque sensor base, an angle sensor base, a tightening motor, a torque sensor for collecting torque during the tightening process of the spiral spring, an angle sensor for collecting rotation angle during the tightening process of the spiral spring, and a tightening fixture. The tightening module bracket is vertically mounted on a fixed platform by several connecting bolts. The tightening module bracket is fixedly connected to the motor base, torque sensor base, and angle sensor base from top to bottom by several bolts. The rotating motor is mounted on the motor base, the torque sensor is mounted on the torque sensor base, and the angle sensor is mounted on the angle sensor base. The tightening motor is coaxially connected to the torque sensor, angle sensor, and tightening fixture in sequence via a coupling. Several loading pins are symmetrically arranged on the upper end face of the tightening fixture, and a ring of locking holes is evenly distributed around the outer edge of the upper end face of the turntable. The loading pins and locking holes are adapted to transmit torque.

[0012] The tightening module bracket is provided with several strip holes for bolts to pass through, so as to install and adjust the height of the motor mount, torque sensor mount and angle sensor mount mounted on it, and ensure the fit between the tightening fixture and the turntable.

[0013] The locking module includes: an electric push rod bracket, a miniature electric push rod, and a locking pin; the electric push rod bracket is installed on a fixed platform by corresponding connecting bolts, and the miniature electric push rod is installed on it; the output shaft of the miniature electric push rod drives the locking pin fixed at its end to perform telescopic movement, and the locking pin can be inserted into the locking hole on the upper end face of the turntable to lock the turntable.

[0014] The camera module includes: a high-speed camera bracket and a high-speed camera; the high-speed camera bracket is fixed on a fixed platform, on which the high-speed camera is mounted, and the high-speed camera is suspended above the tightening module to achieve overhead shooting; the upper end face of the turntable and the upper end face of the split nut are both marked with marking points to accurately obtain the unfolding time and unfolding angular velocity of the spiral spring, as well as the radial displacement and radial velocity of the split nut through shooting.

[0015] The testing system also includes a timing system, which simultaneously controls the locking module and the camera module.

[0016] The present invention discloses a method for using a static and dynamic performance testing system for a planar spiral spring mechanism, comprising the following steps:

[0017] S1. Install the test module: Install the base on the fixed platform, install the bearing between the housing and the turntable, and fix it with the inner positioning shoulder and elastic retaining ring and the outer positioning shoulder and elastic retaining ring. Then connect and fix the housing to the base; after winding the spiral spring around the outside of the split nut, place it inside the turntable, and connect the outer end of the spiral spring to the turntable.

[0018] S2. Install the tightening module: Connect the tightening motor, torque sensor, angle sensor, and tightening fixture sequentially via a coupling, and fix them to the tightening module bracket via the motor mount, torque sensor mount, and angle sensor mount. Then, install the tightening module bracket on the fixed platform. After step S2 is completed, the test module and the tightening module work together to achieve the tightening and unfolding test of the spiral spring under test.

[0019] S3. Install the locking module: Install a miniature electric actuator on the electric actuator bracket, install a locking pin on its output shaft, and then install the electric actuator bracket on the fixed platform; after step S3 is completed, the spiral spring is tightened and locked with the locking module, which can realize the static load-bearing performance test of the spiral spring to be tested;

[0020] S4. Remove the tightening module, install the camera module, attach marking points to the upper surface of the turntable and the upper surface of the split nut, adjust the field of view of the high-speed camera so that it can capture the complete unfolding process of the spiral spring from above, thus enabling dynamic unfolding performance testing of the spiral spring to be tested.

[0021] (III) Beneficial Effects

[0022] Compared with the prior art, the static and dynamic performance testing system of the planar spiral spring mechanism of the present invention adopts a combination design of high-precision angle sensor and torque sensor, which can accurately acquire data such as rotation angle and torque during the spiral spring tightening process; adopts high-resolution high-speed dynamic optical measurement method, which can accurately acquire stress and strain distribution and evolution law during the tightening, bearing and unfolding process of spiral spring; and adopts high-speed camera device, which can accurately acquire dynamic performance such as unfolding time and unfolding angular velocity during the unfolding process of spiral spring. Attached Figure Description

[0023] Figure 1 A schematic diagram of an overall testing system for the static and dynamic performance of a planar spiral spring mechanism.

[0024] Figure 2 A cross-sectional view of the test module of the above test system.

[0025] Figure 3 Schematic diagram of the spiral spring strip for the test system

[0026] Figure 4 Schematic diagram of the tightening module of the test system

[0027] Figure 5 Schematic diagram of the locking module and camera module of the test system Detailed Implementation

[0028] See Figure 1 The present invention provides a static and dynamic performance testing system for a planar spiral spring mechanism, comprising: a test module (1), a tightening module (2), a locking module (3), and a camera module (4); the test module (1) has a fixed platform (101) at its bottom, a tightening module (2) is provided on the rear side of the fixed platform (101), a locking module (3) is provided on the left side of the fixed platform (101), and a camera module (4) is provided on the right side of the fixed platform (101); the testing system can perform different tests: the test module (1) and the tightening module (2) work together to perform tightening and unfolding tests on the spiral spring (104) to be tested; after the spiral spring (104) is tightened, it is locked by the locking module (3) to perform static load-bearing performance tests on the spiral spring (104) to be tested; after the tightening module (2) is removed, the locking module (3) and the camera module (4) work together to perform dynamic unfolding performance tests on the spiral spring (104) to be tested.

[0029] See Figure 2 and Figure 3The test module (1) includes: a fixed platform (101), a base (102), a split nut (103), a spiral spring (104), a turntable (105), a housing (106), a loading bolt (107), a fiber optic grating sensor (108), a bearing (109), an inner positioning shoulder and an elastic retaining ring (110), and an outer positioning shoulder and an elastic retaining ring (111). The base (102) is fixedly mounted on the fixed platform (101) by several longitudinal connecting bolts. The fixed platform (101) and the base (102) are provided with coaxial longitudinal through holes. The loading bolt (107) passes through the longitudinal through hole and is threadedly connected to the split nut (103). A spiral spring (104) is sleeved on the outer periphery of the split nut (103). The inner end of the spiral spring (104) is fixedly connected to the outer periphery of the split nut (103), and the outer end of the spiral spring (104) is fixedly connected to the turntable (105). 105) On the inner side, a strip groove is provided on the inner surface of the spiral spring (104) strip, and a series of fiber Bragg grating sensors (108) are arranged in the strip groove. The wires of the fiber Bragg grating sensors (108) are led out from the inner end and connected to the fiber optic demodulation device; an inner positioning shoulder and an elastic retaining ring (110) are provided on the outer side of the turntable (105), and an outer positioning shoulder and an elastic retaining ring (111) are provided on the inner side of the cylindrical shell (106). The elastic retaining ring (110) and the outer positioning shoulder and elastic retaining ring (111) are arranged in an oblique line, and the bearing (109) is limited and locked between them. The outer shell (106) is sleeved on the positioning boss of the base (102), and the outer side of the outer shell (106) is fixed to the base (102) by several radial connecting bolts. When the loading bolt (107) is rotated, the split nut (103) moves radially and drives the spiral spring (104) to tighten or unfold.

[0030] The segments on the split nut (103) are arranged longitudinally with the same center, and radial positioning is achieved by the radial guide groove and guide boss provided on the base (102); the outer wall of the split nut (103) is provided with a groove with a width slightly larger than that of the spiral spring (104) to prevent the spiral spring (104) from moving axially.

[0031] A buffer device and a capture device are placed below the loading bolt (107) to capture the falling loading bolt (107) after the spiral spring (104) unfolds and the split nut (103) separates.

[0032] The loading method of the test module (1) facilitates the analysis of the interfacial friction and strain distribution evolution and dynamic deployment performance of the spiral spring (104) under different inner radial forces. The fiber optic grating sensor (108) is thin and bonded in the strip groove, which can accurately obtain the stress and strain distribution of the spiral spring (104) along the strip direction, without affecting the performance of the spiral spring (104) itself.

[0033] See Figure 4 The tightening module (2) of the test system includes: a tightening module bracket (201), a motor base (202), a torque sensor base (203), an angle sensor base (204), a tightening motor (204), a torque sensor (205) for collecting torque during the tightening process of the spiral spring (104), an angle sensor (206) for collecting rotation angle during the tightening process of the spiral spring (104), and a tightening fixture (207); the tightening module bracket (201) is vertically installed on the fixed platform (101) by several connecting bolts, and the tightening module bracket (201) is fixedly connected to the motor base (202) from top to bottom by several bolts. 02) Torque sensor seat (203), angle sensor seat; Rotary motor (204) is mounted on motor seat (202), torque sensor (205) is mounted on torque sensor seat (203), and angle sensor (206) is mounted on angle sensor seat; Tightening motor (204) is coaxially connected to torque sensor (205), angle sensor (206), and tightening fixture (207) in sequence via coupling; Several loading pins are symmetrically arranged on the upper end face of tightening fixture (27), and a ring of locking holes is evenly distributed around the outer edge of the upper end face of turntable (105). The loading pins and locking holes are adapted to transmit torque.

[0034] The tightening module bracket (201) is provided with several strip holes for bolts to pass through, so as to install and adjust the height of the motor mount (202), torque sensor mount (203) and angle sensor mount mounted thereon, to ensure the fit between the tightening fixture (207) and the turntable (105).

[0035] See Figure 5 The locking module (3) includes: an electric push rod bracket (301), a miniature electric push rod (302), and a locking pin (303); the electric push rod bracket (301) is installed on the fixed platform (101) by corresponding connecting bolts, and the miniature electric push rod (302) is installed on it; the output shaft of the miniature electric push rod (302) drives the locking pin (303) fixed at its end to perform telescopic movement, and the locking pin (303) can be inserted into the locking hole on the upper end face of the turntable (105) to lock the turntable (105).

[0036] See Figure 5 The camera module (4) includes: a high-speed camera bracket (401) and a high-speed camera (402); the high-speed camera bracket (401) is fixed on the fixed platform (101), and the high-speed camera (402) is installed on it. The high-speed camera (402) is suspended above the tightening module (2) to achieve overhead shooting; the upper end face of the turntable (105) and the upper end face of the split nut (103) are both marked with marking points to accurately obtain the unfolding time and unfolding angular velocity of the spiral spring (104), the radial displacement and radial velocity of the split nut (103) through shooting.

[0037] The testing system also includes a timing system, which simultaneously controls the locking module (3) and the camera module (4).

[0038] The present invention discloses a method for using a static and dynamic performance testing system for a planar spiral spring mechanism, comprising the following steps:

[0039] S1. Install the test module (1): Install the base (102) on the fixed platform (101), install the bearing (109) between the outer shell (106) and the turntable (105), and fix it with the inner positioning shoulder and elastic retaining ring (110) and the outer positioning shoulder and elastic retaining ring (111). Then connect and fix the outer shell (106) to the base (102); after winding the spiral spring (104) around the outside of the split nut (103), place it inside the turntable (105), and connect the outer end of the spiral spring (104) to the turntable (105);

[0040] S2. Install the tightening module (2): Connect the tightening motor (204), torque sensor (205), angle sensor (206), and tightening fixture (207) sequentially through a coupling, and fix them on the tightening module bracket (201) through the motor base (202), torque sensor base (203), and angle sensor base. Then install the tightening module bracket (201) on the fixed platform (101). After step S2 is completed, the test module (1) and the tightening module (2) work together to achieve the tightening and unfolding test of the spiral spring (104) to be tested.

[0041] S3. Install locking module (3): Install miniature electric push rod (302) on electric push rod bracket (301), install locking pin (303) on its output shaft, and then install electric push rod bracket (301) on fixed platform (101); after step S3 is completed, the spiral spring (104) is tightened and locked by locking module (3), which can realize the static load-bearing performance test of the spiral spring (104) to be tested;

[0042] S4. Remove the tightening module (2), install the camera module (4), paste marking points on the upper end face of the turntable (105) and the upper end face of the split nut (103), adjust the field of view of the high-speed camera (402) so that it can shoot the complete unfolding process of the spiral spring (104) from above, and realize the dynamic unfolding performance test of the spiral spring (104) to be tested.

Claims

1. A test system for the static and dynamic performance of a planar spiral spring mechanism, characterized in that, include: The test module (1), tightening module (2), locking module (3), and camera module (4) are provided. The bottom of the test module (1) has a fixed platform (101), the rear side of the fixed platform (101) is provided with the tightening module (2), the left side of the fixed platform (101) is provided with the locking module (3), and the right side of the fixed platform (101) is provided with the camera module (4). The test system can perform different tests: the test module (1) and the tightening module (2) work together to perform the tightening and unfolding test of the spiral spring (104) to be tested; after the spiral spring (104) is tightened, it is locked by the locking module (3) to perform the static load-bearing performance test of the spiral spring (104) to be tested; after the tightening module (2) is removed, the locking module (3) and the camera module (4) work together to perform the dynamic unfolding performance test of the spiral spring (104) to be tested. The test module (1) includes: a fixed platform (101), a base (102), a split nut (103), a spiral spring (104), a turntable (105), a shell (106), a loading bolt (107), a fiber optic grating sensor (108), a bearing (109), an inner positioning shoulder and an elastic retaining ring (110), and an outer positioning shoulder and an elastic retaining ring (111). The base (102) is fixedly installed on the fixed platform (101) by several longitudinal connecting bolts. The fixed platform (101) and the base (102) are provided with coaxial longitudinal through holes. The loading bolt (107) passes through the longitudinal through hole and is threadedly connected to the split nut (103). A spiral spring (104) is sleeved on the outer periphery of the split nut (103). The inner end of the spiral spring (104) is fixedly connected to the outer periphery of the split nut (103), and the outer end of the spiral spring (104) is fixedly connected to the turntable (105). 05) On the inner side, a strip groove is provided on the inner surface of the spiral spring (104) strip. A series of fiber optic grating sensors (108) are arranged in the strip groove. The wires of the fiber optic grating sensors (108) are led out from the inner end and connected to the fiber optic demodulation device. An inner positioning shoulder and an elastic retaining ring (110) are provided on the outer side of the turntable (105). An outer positioning shoulder and an elastic retaining ring (111) are provided on the inner side of the cylindrical shell (106). The inner positioning shoulder and the elastic retaining ring (110) and the outer positioning shoulder and the elastic retaining ring (111) are arranged in an oblique line, and a bearing (109) is limited and clamped between them. The shell (106) is sleeved on the positioning boss of the base (102), and the outer side of the shell (106) is fixed to the base (102) by several radial connecting bolts. When the loading bolt (107) is rotated, the split nut (103) moves radially and drives the spiral spring (104) to tighten or unfold.

2. The static and dynamic performance testing system for the planar spiral spring mechanism as described in claim 1, characterized in that, The segments on the split nut (103) are arranged longitudinally with the same center, and radial limit is achieved by the radial guide groove and guide boss provided on the base (102); the outer wall of the split nut (103) is provided with a groove with a width slightly larger than that of the spiral spring (104) to avoid axial movement of the spiral spring (104).

3. The static and dynamic performance testing system for the planar spiral spring mechanism as described in claim 2, characterized in that, A buffer device and a capture device are placed below the loading bolt (107) to capture the falling loading bolt (107) after the spiral spring (104) unfolds and the split nut (103) separates.

4. The static and dynamic performance testing system for the planar spiral spring mechanism as described in claim 1, characterized in that, The tightening module (2) includes: a tightening module bracket (201), a motor base (202), a torque sensor base (203), an angle sensor base, a tightening motor (204), a torque sensor (205) for collecting torque during the tightening process of the spiral spring (104), an angle sensor (206) for collecting rotation angle during the tightening process of the spiral spring (104), and a tightening fixture (207); the tightening module bracket (201) is vertically installed on the fixed platform (101) by several connecting bolts, and the tightening module bracket (201) is fixedly connected to the motor base (202) from top to bottom by several bolts. A torque sensor base (203) and an angle sensor base are provided. A tightening motor (204) is mounted on a motor base (202), a torque sensor (205) is mounted on a torque sensor base (203), and an angle sensor (206) is mounted on an angle sensor base. The tightening motor (204) is coaxially connected to the torque sensor (205), the angle sensor (206), and the tightening fixture (207) in sequence via a coupling. Several loading pins are symmetrically arranged on the upper end face of the tightening fixture (207), and a ring of locking holes is evenly distributed around the outer edge of the upper end face of the turntable (105). The loading pins and locking holes are adapted to transmit torque.

5. The static and dynamic performance testing system for the planar spiral spring mechanism as described in claim 4, characterized in that, The tightening module bracket (201) is provided with several strip holes for bolts to pass through, so as to install and adjust the height of the motor mount (202), torque sensor mount (203) and angle sensor mount mounted thereon, to ensure the fit between the tightening fixture (207) and the turntable (105).

6. The static and dynamic performance testing system for the planar spiral spring mechanism as described in claim 4, characterized in that, The locking module (3) includes: an electric push rod bracket (301), a miniature electric push rod (302), and a locking pin (303); the electric push rod bracket (301) is installed on the fixed platform (101) by corresponding connecting bolts, and the miniature electric push rod (302) is installed on it; the output shaft of the miniature electric push rod (302) drives the locking pin (303) fixed at its end to perform telescopic movement, and the locking pin (303) can be inserted into the locking hole on the upper end face of the turntable (105) to lock the turntable (105).

7. The static and dynamic performance testing system for the planar spiral spring mechanism as described in claim 4, characterized in that, The camera module (4) includes: a high-speed camera bracket (401) and a high-speed camera (402); the high-speed camera bracket (401) is fixed on the fixed platform (101), and the high-speed camera (402) is installed on it. The high-speed camera (402) is suspended above the tightening module (2) to achieve overhead shooting; the upper end face of the turntable (105) and the upper end face of the split nut (103) are both marked with marking points to accurately obtain the unfolding time and unfolding angular velocity of the spiral spring (104), the radial displacement and radial velocity of the split nut (103) through shooting.

8. The static and dynamic performance testing system for the planar spiral spring mechanism as described in claim 7, characterized in that, The testing system also includes a timing system, which simultaneously controls the locking module (3) and the camera module (4).

9. The method of using the static and dynamic performance testing system for the planar spiral spring mechanism as described in claim 8, comprising the following steps: S1. Install the test module (1): Install the base (102) on the fixed platform (101), install the bearing (109) between the outer shell (106) and the turntable (105), and fix it with the inner positioning shoulder and elastic retaining ring (110) and the outer positioning shoulder and elastic retaining ring (111). Then connect and fix the outer shell (106) to the base (102); after winding the spiral spring (104) around the outside of the split nut (103), place it inside the turntable (105), and connect the outer end of the spiral spring (104) to the turntable (105); S2. Install the tightening module (2): Connect the tightening motor (204), torque sensor (205), angle sensor (206), and tightening fixture (207) sequentially through a coupling, and fix them on the tightening module bracket (201) through the motor base (202), torque sensor base (203), and angle sensor base. Then install the tightening module bracket (201) on the fixed platform (101). After step S2 is completed, the test module (1) and the tightening module (2) work together to achieve the tightening and unfolding test of the spiral spring (104) to be tested. S3. Install locking module (3): Install miniature electric push rod (302) on electric push rod bracket (301), install locking pin (303) on its output shaft, and then install electric push rod bracket (301) on fixed platform (101); after step S3 is completed, the spiral spring (104) is tightened and locked by locking module (3), which can realize the static load-bearing performance test of the spiral spring (104) to be tested; S4. Remove the tightening module (2), install the camera module (4), paste marking points on the upper end face of the turntable (105) and the upper end face of the split nut (103), adjust the field of view of the high-speed camera (402) so that it can shoot the complete unfolding process of the spiral spring (104) from above, and realize the dynamic unfolding performance test of the spiral spring (104) to be tested.

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