Angle of Attack Platform Based on Hydraulic Drive and Self-Locking of Worm and Worm Gear and Its Usage Method

Abstract

The present invention belongs to the technical field of wind tunnel equipment, and discloses an angle of attack platform based on hydraulic drive and worm and worm gear self-locking and its usage method. The angle of attack platform includes an installation base fixed on an installation foundation, and left and right symmetric installation side plates fixed on the upper surface of the installation base; it includes a worm and worm gear self-locking mechanism, a bending knife assembly and a model installation platform that are located in the middle of the two installation side plates and are connected in sequence from bottom to top; it also includes a hydraulic cylinder that drives the bending knife assembly and drives the model installation platform to rotate around the rotation center of the bending knife assembly. The usage method adopts a hydraulic cylinder with a hydraulic valve and a worm and worm gear with a self-locking function. The hydraulic cylinder is driven by a servo hydraulic system, and the worm and worm gear are driven by a servo motor. The hydraulic cylinder drives the angle of attack platform to rotate around the arc guide rail. When it moves to the specified angle of attack, the hydraulic lock is activated and the position of the hydraulic cylinder remains unchanged, realizing the self-locking of the worm and worm gear. The angle of attack platform and its usage method have a self-locking function, and realize the locking of the angle of attack of the test model at any position.

Description

Technical Field

[0001] The invention belongs to the technical field of wind tunnel equipment, and in particular relates to an angle-of-attack platform based on hydraulic drive and worm gear self-locking and a use method thereof. Background Art

[0002] The wind tunnel test model is installed on the test model angle of attack platform in the test cabin. The test model angle of attack platform is used to support the test model and change the angle of attack of the test model. There are two support methods: belly support and tail support. The test model angle of attack platform needs to meet the requirements of high frequency of use, high precision, small deformation, and high task position locking precision.

[0003] The China Patent Literature Library has published an invention patent with application number 202011445511.6 and the invention name is a wind tunnel angle-changing device driven by a lead screw pair suitable for special temperature environments. This invention patent uses a motor to drive the lead screw pair, and the linear motion of the lead screw pair drives the scimitar to rotate to achieve the change of the angle of attack of the tail support model. However, due to the movement gap of the lead screw pair, when the load condition changes, the angle of attack is not locked, which will cause the test model angle of attack to change.

[0004] The Chinese Patent Literature Library has published an application number of 201510153303.1, the invention name of which is an electro-hydraulic hybrid driven lead screw transmission system and its control method. This invention patent uses the advantages of electric servo and hydraulic servo in an attempt to achieve precise positioning and stable control of the test model's attack angle under heavy load. However, since the lead screw pair is used to transmit direct motion power, and the angle of attack is changed by converting the linear motion of the lead screw pair into rotational motion, the problem of motion clearance in the lead screw pair is still not solved. Under variable load conditions, the angle of attack of the test model will still change due to the untightened angle of attack.

[0005] In general, when the motor drives the lead screw to drive a large load, there will be problems such as slow response speed and low-speed creeping. Hydraulics have the characteristics of large driving force, but when hydraulic drive drives a large load, there are poor controllability and low positioning accuracy. Once the hydraulic pressure suddenly loses, the test model will be in an uncontrollable state.

[0006] In view of the characteristics of wind tunnel test models such as large load, high precision, small deformation requirement, and high task position locking requirement, there is an urgent need to develop an angle of attack platform based on hydraulic drive and worm gear self-locking and its use method. Summary of the invention

[0007] One technical problem to be solved by the present invention is to provide an angle of attack platform based on hydraulic drive and worm gear self-locking. Another technical problem to be solved by the present invention is to provide a method for using an angle of attack platform based on hydraulic drive and worm gear self-locking for test model support and posture adjustment.

[0008] The angle of attack platform based on hydraulic drive and self-locking of worm and worm gear of the present invention includes an installation base fixed on an installation foundation, and symmetrically arranged left and right installation side plates fixed on the upper surface of the installation base; it includes a worm and worm gear self-locking mechanism, a cutter assembly and a model installation platform which are sequentially connected from bottom to top and located in the middle of the two installation side plates; it also includes a hydraulic cylinder for driving the cutter assembly to drive the model installation platform to rotate around the rotation center of the cutter assembly.

[0009] Further, the cutter assembly includes left and right symmetrically arranged cutter supports corresponding to the left and right symmetrically arranged installation side plates respectively; the cutter supports are fan-shaped, and the central angle of the fan is 90°; the low point of the arc surface of the cutter support is close to the upper surface of the installation base, and a horizontal shaft penetrating from left to right is arranged between the high points of the arc surface of the cutter support.

[0010] The model installation platform straddles the upper part of the two cutter supports and is fixed on the upper plane surface of the cutter supports; the arc worm straddles the lower part of the two cutter supports and is fixed on the lower arc surface of the cutter supports.

[0011] A number of arc-shaped distributed guide rail sliders are arranged on each cutter support, and a number of parallel arc-shaped guide rails are arranged on each installation side plate, and the guide rail sliders are installed and clamped on the arc-shaped guide rails on the corresponding side.

[0012] When the left and right symmetrically arranged cutter supports rotate around the rotation center of the cutter assembly, the guide rail sliders slide along the arc-shaped guide rails.

[0013] Further, the hydraulic cylinder is arranged vertically; the upper end of the hydraulic cylinder is fixed on the horizontal shaft through a cylindrical pin shaft, and the lower end is fixed on the upper surface of the installation base through a cylindrical pin shaft; there is a clearance fit between the end of the hydraulic cylinder and the cylindrical pin shaft.

[0014] Further, the worm mounting seat of the worm and worm gear self-locking mechanism is a right triangle, and a commutator, a connecting shaft, a reducer and a worm are sequentially fixed on the inclined surface of the worm mounting seat from bottom to top; the commutator and the reducer are fixed through brackets, and the front and rear ends of the worm are fixed through bearing seats; the commutator is connected to a servo motor.

[0015] The end of the worm is sequentially sleeved with a bearing spacer sleeve, a ball bearing and a bearing nut from inside to outside and fixed on the bearing seat; the worm meshes with the arc worm.

[0016] The usage method of the angle of attack platform based on hydraulic drive and self-locking of worm and worm gear of the present invention includes the following steps:

[0017] S10. When the model installation platform is ready to change the angle of attack, the servo motor applies a torque to the worm.

[0018] S20. The hydraulic cylinder is started, the hydraulic lock is opened, and the servo motor is enabled in the torque mode.

[0019] S30. The hydraulic cylinder drives the machete assembly to rotate, the arc worm gear rotates, the worm follows, and the model installation platform moves to the specified attack angle;

[0020] S40. Start the hydraulic lock, cancel the torque mode of the servo motor, and turn off the servo motor enable;

[0021] S50. Double-lock the hydraulic lock of the hydraulic cylinder and the self-locking mechanism of the worm and worm gear to eliminate the load introduced by the self-locking mechanism of the worm and worm gear during the movement of the attack angle platform.

[0022] Further, the hydraulic lock is a two-way cartridge valve. When the hydraulic cylinder stops moving, it ensures that the position of the hydraulic rod remains unchanged, playing a role in safety protection and preset time positioning.

[0023] The attack angle platform based on hydraulic drive and self-locking of worm and worm gear and its usage method of the present invention adopt a hydraulic cylinder with a hydraulic valve and a worm and worm gear with a self-locking function. The hydraulic cylinder is driven by a servo hydraulic system, and the worm and worm gear are driven by a servo motor. The hydraulic cylinder drives the attack angle platform to rotate around the arc guide rail. When it moves to the specified attack angle, the hydraulic lock is started to ensure that the position of the hydraulic cylinder remains unchanged, realizing the self-locking of the worm and worm gear.

[0024] The attack angle platform based on hydraulic drive and self-locking of worm and worm gear and its usage method of the present invention can eliminate the load introduced by the self-locking of the worm and worm gear during the movement of the hydraulic drive attack angle platform, solve the problem of uncontrollable attack angle of the test model under large load conditions and sudden pressure loss of the hydraulic cylinder, and ensure that the attack angle of the test model remains unchanged at the current position under variable load, large load, and hydraulic pressure loss conditions, making the test model safe and controllable.

[0025] The attack angle platform based on hydraulic drive and self-locking of worm and worm gear and its usage method of the present invention have the characteristics of high precision, large load, and stable operation, have a self-locking function, and realize the locking of the attack angle of the test model at any position. Description of the Drawings

[0026] Figure 1 is a schematic diagram of the external structure of the attack angle platform based on hydraulic drive and self-locking of worm and worm gear of the present invention;

[0027] Figure 2 is a schematic diagram of the internal structure of the attack angle platform based on hydraulic drive and self-locking of worm and worm gear of the present invention;

[0028] Figure 3 is a schematic diagram of the structure of the self-locking device of the worm and worm gear in the attack angle platform based on hydraulic drive and self-locking of worm and worm gear of the present invention.

[0029] In the figure: 1. Installation base; 2. Installation side plate; 3. Machete assembly; 4. Worm and worm gear self-locking mechanism; 5. Model installation platform; 6. Hydraulic cylinder;

[0030] 301. Curved knife support; 302. Guide rail slider; 303. Arc guide rail;

[0031] 401. Worm; 402. Worm mounting seat; 403. Reducer; 404. Connecting shaft; 405. Servo motor; 406. Commutator; 407. Bearing seat; 408. Arc worm gear; 409. Bearing nut; 410. Bearing spacer sleeve; 411. Ball bearing. Detailed implementation manners

[0032] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0033] Embodiment 1: As Figures 1 to 3 shown, the angle of attack platform based on hydraulic drive and worm and worm gear self-locking of this embodiment includes a mounting base 1 fixed on a mounting foundation, and left and right symmetric mounting side plates 2 fixed on the upper surface of the mounting base 1; it includes a worm and worm gear self-locking mechanism 4, a curved knife assembly 3, and a model mounting platform 5 that are sequentially connected from bottom to top and located in the middle of the two mounting side plates 2; it further includes a hydraulic cylinder 6 that drives the curved knife assembly 3 to drive the model mounting platform 5 to rotate around the rotation center of the curved knife assembly.

[0034] Furthermore, the curved knife assembly 3 includes left and right symmetric curved knife supports 301 respectively corresponding to the left and right symmetric mounting side plates 2; the curved knife support 301 is fan-shaped, and the central angle of the fan is 90°; the low point of the arc surface of the curved knife support 301 is close to the upper surface of the mounting base 1, and a horizontal shaft running through left and right is arranged between the high points of the arc surface of the curved knife support 301;

[0035] The model mounting platform 5 spans above the two curved knife supports 301 and is fixed on the upper plane surface of the curved knife supports 301; the arc worm gear 408 spans below the two curved knife supports 301 and is fixed on the lower arc surface of the curved knife supports 301;

[0036] A number of arc-shaped distributed guide rail sliders 302 are arranged on each curved knife support 301, and a number of parallel arc guide rails 303 are arranged on each mounting side plate 2, and the guide rail sliders 302 are installed and clamped on the arc guide rails 303 on the corresponding side;

[0037] When the left and right symmetric curved knife supports 301 rotate around the rotation center of the curved knife assembly, the guide rail sliders 302 slide along the arc guide rails 303.

[0038] Furthermore, the hydraulic cylinder 6 is vertically arranged; the upper end of the hydraulic cylinder 6 is fixed on the horizontal shaft through a cylindrical pin shaft, and the lower end is fixed on the upper surface of the mounting base 1 through a cylindrical pin shaft; there is a clearance fit between the end of the hydraulic cylinder 6 and the cylindrical pin shaft.

[0039] Further, the worm mounting base 402 of the worm and worm gear self-locking mechanism 4 is a right triangle. A commutator 406, a connecting shaft 404, a reducer 403, and a worm 401 are sequentially fixed from bottom to top on the inclined surface of the worm mounting base 402. The commutator 406 and the reducer 403 are fixed by brackets. The front and rear ends of the worm 401 are fixed by bearing seats 407. The commutator 406 is connected to a servo motor 405.

[0040] The end of the worm 401 is sleeved with a bearing spacer 410, a ball bearing 411, and a bearing nut 409 from inside to outside and is fixed on the bearing seat 407. The worm 401 meshes with the arc worm gear 408.

[0041] The usage method of the angle of attack platform based on hydraulic drive and worm and worm gear self-locking in this embodiment includes the following steps:

[0042] S10. When the model installation platform 5 is ready to change the angle of attack, the servo motor 405 applies a torque to the worm 401.

[0043] S20. The hydraulic cylinder 6 is started, the hydraulic lock is opened, and the servo motor 405 is enabled in the torque mode.

[0044] S30. The hydraulic cylinder 6 pushes the cutter head assembly 3 to rotate, the arc worm gear 408 rotates, the worm 401 follows, and the model installation platform 5 moves to the specified angle of attack.

[0045] S40. The hydraulic lock is started, the torque mode of the servo motor 405 is cancelled, and the servo motor 405 is disabled.

[0046] S50. The hydraulic lock of the hydraulic cylinder 6 and the worm and worm gear self-locking mechanism 4 are double-locked to eliminate the load introduced by the worm and worm gear self-locking mechanism 4 during the movement of the angle of attack platform.

[0047] Further, the hydraulic lock is a two-way cartridge valve, which ensures that the position of the hydraulic rod remains unchanged when the hydraulic cylinder 6 stops moving, playing a role in safety protection and preset time positioning.

[0048] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. For those familiar with the art, without departing from the principle of the present invention, all the features disclosed in the present invention, or all the steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way. The present invention is not limited to the specific details and the illustrated examples here.

Claims

1. An angle of attack platform based on hydraulic drive and self-locking of worm and worm gear, characterized in that The angle of attack platform described above includes a mounting base (1) fixed on the installation foundation, and left and right symmetric mounting side plates (2) fixed on the upper surface of the mounting base (1); it includes a worm and worm gear self-locking mechanism (4), a curved knife assembly (3) and a model mounting platform (5) that are sequentially connected from bottom to top and located in the middle of the two mounting side plates (2); it also includes a hydraulic cylinder (6) that drives the curved knife assembly (3) to drive the model mounting platform (5) to rotate around the rotation center of the curved knife assembly; The described curved knife assembly (3) includes left and right symmetric curved knife supports (301) respectively corresponding to the left and right symmetric mounting side plates (2); the curved knife supports (301) are fan-shaped, and the central angle of the fan is 90°; the low point of the arc surface of the curved knife support (301) is close to the upper surface of the mounting base (1), and a horizontal axis running through left and right is arranged between the high points of the arc surfaces of the curved knife supports (301); The model mounting platform (5) spans above the two curved knife supports (301) and is fixed on the upper plane surface of the curved knife supports (301); the arc worm (408) spans below the two curved knife supports (301) and is fixed on the lower arc surface of the curved knife supports (301); A number of circular arc-shaped distributed guide rail sliders (302) are arranged on each curved knife support (301), and a number of parallel circular arc guide rails (303) are arranged on each mounting side plate (2), and the guide rail sliders (302) are installed on the circular arc guide rails (303) on the corresponding side; When the left and right symmetric curved knife supports (301) rotate around the rotation center of the curved knife assembly, the guide rail sliders (302) slide along the circular arc guide rails (303); The described hydraulic cylinder (6) is vertically arranged; the upper end of the hydraulic cylinder (6) is fixed on the horizontal axis by a cylindrical pin shaft, and the lower end is fixed on the upper surface of the mounting base (1) by a cylindrical pin shaft; there is a clearance fit between the end of the hydraulic cylinder (6) and the cylindrical pin shaft; The worm mounting base (402) of the described worm and worm gear self-locking mechanism (4) is a right triangle, and a commutator (406), a connecting shaft (404), a reducer (403) and a worm (401) are sequentially fixed on the inclined surface of the worm mounting base (402) from bottom to top; the commutator (406) and the reducer (403) are fixed by brackets, and the front and rear ends of the worm (401) are fixed by bearing seats (407); the commutator (406) is connected to the servo motor (405); The end of the worm (401) is sequentially sleeved with a bearing spacer sleeve (410), a ball bearing (411) and a bearing nut (409) from inside to outside and is fixed on the bearing seat (407); the worm (401) meshes with the arc worm (408).

2. Method of using an angle of attack platform based on hydraulic drive and self-locking of worm and worm gear, which is used for the angle of attack platform based on hydraulic drive and self-locking of worm and worm gear according to claim 1, characterized in that, It includes the following steps: S10. When the model mounting platform (5) is ready to change the angle of attack, the servo motor (405) applies a torque to the worm (401); S20. The hydraulic cylinder (6) is started, the hydraulic lock is opened, and the servo motor (405) is enabled in the torque mode; S30. The hydraulic cylinder (6) pushes the curved knife assembly (3) to rotate, the arc worm (408) rotates, the worm (401) follows, and the model mounting platform (5) moves to the specified angle of attack; S40. Start the hydraulic lock, cancel the torque mode of the servo motor (405), and turn off the enable of the servo motor (405); S50. Double-lock the hydraulic lock of the hydraulic cylinder (6) and the worm and worm gear self-locking mechanism (4) to eliminate the load introduced by the worm and worm gear self-locking mechanism (4) during the movement of the angle of attack platform.

3. The method of using an angle of attack platform based on hydraulic drive and self-locking of worm and worm gear according to claim 2, characterized in that The hydraulic lock is a two-way cartridge valve. When the hydraulic cylinder (6) stops moving, it ensures that the position of the hydraulic rod remains unchanged, playing a role in safety protection and preset time positioning.

Images