CN103630341B - Device for torsion experiment rotation characteristic test in thermal vacuum environment - Google Patents

Abstract

A kind of device for torsion experiment rotation characteristic test in thermal vacuum environment, comprise deflector rod device, index plate, connection spline, mounting platform, thermal vacuum tank etc., mounting platform is fixed in thermal vacuum tank, mounting platform fixes measured piece, measured piece connects measured piece output shaft, and measured piece output shaft is by connecting spline joint transmission shaft, and transmission shaft is drawn out to outside tank through thermal vacuum tank, connect spline joint deflector rod device, deflector rod device is arranged in thermal vacuum tank; The present invention adopts deflector rod device to control to be measured the de-conjunction between output shaft and transmission shaft in tank outward at tank, accurately can be obtained the rotational characteristic of measured piece output shaft outward at tank by index plate, do not produce added influence to measured piece output shaft, measuring accuracy is high, simple to operation.

Description

Rotation characteristic test device for torsion test in thermal vacuum environment

technical field

The invention relates to a device for testing rotational characteristics of a torsion test in a thermal vacuum environment

Background technique

Aerospace equipment has extremely high performance requirements due to the particularity of its application in the outer space environment. In order to meet the design requirements, it is necessary to simulate the thermal vacuum environment of outer space on the ground, and test the performance and function of the DUT under vacuum and thermal cycle conditions. For example, in the thermal vacuum test that drives or loads the tested part to simulate the drive and load of the tested mechanism, not only a reasonable transmission device is required, but also real-time high-precision measurement equipment such as torque, rotation angle and rotational speed. Ability.

Due to the reduced reliability of sensors and power equipment in a thermal vacuum environment, the service life is shortened, and it is difficult to control during the test process. Therefore, the test piece is placed in a vacuum tank that simulates a thermal vacuum environment, and the torque is transmitted to the vacuum through a sealing device. Outside of the tank, drive loading and information measurements are performed outside the thermal vacuum tank. In the thermal vacuum test, the magnetic fluid seal transmission device is often used as the seal, and the output shaft of the tested part is connected with the magnetic fluid seal transmission shaft to lead out to the outside normal temperature environment.

During the test process, the thermal vacuum tank must always be in a sealed state, so it is very difficult to adjust the DUT in the tank. When measuring the no-load characteristics of the tested part, it is necessary to load it with torque and then disconnect the output shaft of the tested part from the loading device outside the tank. If the magnetic fluid seal drive shaft is disconnected from the loading device outside the tank, It is easy to operate, but it will introduce the influence of the rotational friction of the magnetic fluid seal device. If the connection between the output shaft of the test piece and the magnetic fluid seal transmission shaft is directly disconnected in the tank, the test result is accurate, but it is difficult to operate due to the influence of the heated vacuum tank. On the other hand, the sensor cannot be used to measure the rotation angle and rotational speed in the tank, which makes the measurement of the information of the tested part in the thermal vacuum simulation environment an indirect measurement, and it is very difficult to obtain accurate measurement values.

Contents of the invention

In order to solve the problems of difficult measurement of rotational characteristics in thermal vacuum environment and disengagement of the output shaft of the tested part from the outside world, the present invention provides a rotational characteristic testing device for torsion test in thermal vacuum environment with convenient operation and accurate measurement.

The technical scheme that the present invention solves its technical problem adopts is:

A device for testing the rotational characteristics of a torsion test in a thermal vacuum environment, comprising a lever device, an indexing plate, connecting splines, a mounting platform, a thermal vacuum tank, and the like. The installation platform is fixed in the thermal vacuum tank, the device under test is fixed on the installation platform, the device under test is connected to the output shaft of the device under test, and the output shaft of the device under test is connected to the transmission shaft through a connection spline, and the The transmission shaft is led out of the tank through the thermal vacuum tank; the connecting spline is connected to the lever device, and the lever device is installed in the thermal vacuum tank;

The indexing plate includes a scale plate and a vernier plate, the scale plate is set on the output shaft of the tested piece, and the vernier plate passes through the output shaft of the tested piece and is fixed on the installation platform, and the vernier plate and the tested piece There is no contact between the output shafts, and the dial and vernier are parallel with a very small gap between them.

The end of the output shaft of the tested object and the top end of the transmission shaft are fitted with a spline shaft respectively, and the spline sleeve is fitted on the spline shaft.

The lever device includes a pick piece, a rack, a gear, a rotating rod, a rotating rod support, and a sealing seat. The picking piece passes through the output shaft and the transmission shaft of the tested part and is sleeved on both sides of the spline sleeve. The movement of the paddle can push the spline sleeve to move without affecting the spline shaft. The paddle is fixed on the rack that can slide on the installation platform, the gear is meshed with the rack, and the rotating rod is fixed to the center of the gear. The rotating rod is led out of the tank through the thermal vacuum tank, the rotating rod support seat is fixed on the installation platform to support the rotating rod, and the rotating rod and the thermal vacuum tank are sealed by a sealing seat.

The outer circumference of the dial is engraved with scale lines that equally divide the circumference, and the minimum scale is the value y. There are n equal division scales engraved on the vernier plate, and the total length of the scale is equal to (n-1) equal division scales on the dial. The total degrees are equal, and the zero scale line of the equal division scale is opposite to the observation window on the side of the thermal vacuum tank, and the equal division scale has two symmetrically distributed positions. The outer surface of the dial is uniformly distributed with photosensitive areas along the circumferential direction, and there are at least two photosensitive areas.

The thermal vacuum tank also includes a tank cover and a tank body, the tank body is sealed by the tank cover, the transmission shaft passes through the tank cover, and an observation window is opened on the thermal vacuum tank body.

Further, an observation lens is installed on the observation window.

Design idea of the present invention is:

Affected by the thermal vacuum tank, it is necessary to control the disengagement of the output shaft of the DUT in the tank and the outside world outside the thermal vacuum tank without additional impact on the output shaft of the DUT, so as to meet the needs of the no-load characteristic test. The invention adopts a lever device to control the disengagement between the output shaft and the transmission shaft of the measured part outside the tank. The lever device adopts the design principle of rack and pinion. The rotating shaft that is led out of the thermal vacuum tank can be driven by the gear on the rotating shaft to move the rack. The paddle is installed vertically on the rack. Therefore, the rotation of the external rotating shaft of the thermal vacuum tank Controls the movement of the paddles inside the thermal vacuum tank. Spline shafts are installed on the output shaft and transmission shaft of the tested part respectively. The spline sleeve is set on the spline shaft. The paddles are located on both sides of the spline sleeve. Disengage the connection between the spline sleeve and the spline shaft on the output shaft of the tested part, so as to release the output shaft of the tested part freely; in the same way, the rotating shaft drives the pick to move the splined sleeve to the side of the output shaft of the tested part Move to re-engage the spline sleeve with the spline shaft on the output shaft of the tested part. The lever device can realize disconnection and connection between the output shaft and the transmission shaft of the tested part. The structure is simple, the operation is convenient, and the movement of the output shaft of the tested part and the sealing effect of the thermal vacuum tank are not affected.

On the other hand, measuring devices such as sensors cannot be used in a thermal vacuum environment, so the rotation angle and rotational speed of the output shaft of the DUT must be accurately measured outside the thermal vacuum tank. The invention can accurately measure the rotation angle of the output shaft of the measured piece by using the indexing plate. The design of the indexing plate adopts the principle of the vernier caliper, the scale plate is fixed with the output shaft of the tested part, and the vernier plate is used for accurate reading. The outer circumference of the dial is engraved with scale lines that equally divide the circumference, the smallest scale is the value y, n equal-divided scales are engraved on the vernier, and the total length of the scale is equal to the total number of (n-1) equal-divided scales on the dial. Therefore the measurement accuracy is y/n.

There is an observation window on the thermal vacuum tank, and the indexing plate is observed through the viewing window. The angle of the rotating shaft is the addition of the main reading on the dial and the indexing number of the vernier plate. The vernier disc has two symmetrically distributed scales, and the average value of the angle of the rotating shaft can be obtained through the two observation windows to reduce the impact of the error caused by the eccentricity of the two discs on the measurement accuracy.

Since the indexing plate can only measure the angle of the current output shaft of the tested part, but cannot measure the total number of rotations and rotation speed, the photosensitive areas are evenly distributed along the circumferential direction on the outer surface of the dial, and there are at least two photosensitive areas. The angle between the photosensitive regions is known. The laser can be emitted by the laser speed measuring device to pass through the observation window and act on the dial, and the induction pulse can be obtained through the photosensitive area. According to the time interval between the two pulses, the rotational angular velocity of the output shaft of the tested part can be obtained, and the number of pulses can be obtained. The number of revolutions of the output shaft of the tested object.

If the distance between the index plate and the observation window is too far, an observation lens can be installed on the observation window for reading.

Description of drawings

Figure 1 is a schematic diagram of a test device for torsion test rotation characteristics in a thermal vacuum environment

Figure 2 is the A-A view of Figure 1

Figure 3 is a top view of Figure 1

Figure 4 is a schematic diagram of the indexing plate

Detailed ways

With reference to Figures 1 to 4, a device for testing the rotational characteristics of a torsion test in a thermal vacuum environment includes a lever device, an indexing plate 3, connecting splines, a mounting platform 10, a thermal vacuum tank, and the like. The thermal vacuum tank comprises a tank cover 8 and a tank body 1 which is sealed by the tank cover 8 . The installation platform 10 is fixed in the thermal vacuum tank, the DUT 2 is fixed on the installation platform 10, the DUT 2 is connected to the output shaft 11 of the DUT, and the output shaft 11 of the DUT is connected by a spline Connect the transmission shaft 12, the transmission shaft 12 is drawn out of the tank through the tank cover 8 of the thermal vacuum tank; the connecting spline is connected to the lever device, and the lever device is installed in the thermal vacuum tank; the thermal vacuum tank Have observation window 9 on the casing.

The indexing plate includes a scale plate 17 and a vernier plate 18, the scale plate 17 is sleeved on the output shaft 11 of the tested piece, and the vernier plate 18 is fixed on the installation platform 10 through the output shaft 11 of the tested piece, so There is no contact between the vernier disk 17 and the output shaft 11 of the tested object, and the dial 17 and the vernier disk 18 are parallel with a very small gap between them.

The outer circumference of the dial 17 is engraved with scale lines that equally divide the circumference, and the minimum scale is the value y. The vernier plate 18 is engraved with n equally divided scales, and the total length of the scale is equal to (n-1) on the dial 17. The total degrees of the equal division scale are equal, and the zero scale line of the equal division scale is opposite to the observation window 9 on the side of the thermal vacuum tank, and the said equal division scale has two symmetrically distributed front and rear. The outer surface of the dial 17 is uniformly distributed with photosensitive areas 19 along the circumferential direction, and there are at least two photosensitive areas 19 .

The end of the output shaft 11 of the tested object and the top end of the transmission shaft 12 are fitted with a spline shaft respectively, and the spline sleeve 5 is fitted with the spline shaft.

The lever device includes a dial 4, a rack 6, a gear 13, a rotating rod 16, a rotating rod support 14, and a sealing seat 15. The two sides of the spline sleeve 5, the movement of the plectrum 4 can push the spline sleeve 5 to move without affecting the spline shaft, the plectrum 4 is fixed on the rack 6 that can slide on the installation platform 10, the The gear 13 meshes with the rack 6, the center of the rotating rod 16 and the gear 13 is fixed, the rotating rod 16 passes through the thermal vacuum tank 1 and is led out of the tank, and the rotating rod support base 14 is fixed on the installation platform 10 to support the rotating rod 16 , the rotating rod 16 is sealed with the thermal vacuum tank 1 through the sealing seat 15 .

Further, an observation lens is installed on the observation window 9 .

Claims (3)

1. a device for torsion experiment rotation characteristic test in thermal vacuum environment, is characterized in that: comprise deflector rod device, index plate, connection spline, mounting platform, thermal vacuum tank; Described mounting platform is fixed in thermal vacuum tank, and described mounting platform fixes measured piece, and described measured piece connects measured piece output shaft, and described measured piece output shaft is by connecting spline joint transmission shaft, and described transmission shaft is drawn out to outside tank through thermal vacuum tank; Described connection spline joint deflector rod device, described deflector rod device is arranged in thermal vacuum tank;

Described index plate comprises index dial and alidade, described index dial is sleeved on measured piece output shaft, described alidade is fixed on mounting platform through measured piece output shaft, do not contact between described alidade with measured piece output shaft, described index dial and alidade parallel and between there is minimum gap;

Described measured piece output shaft end and transmission shaft top are set with splined shaft, and described spline housing is sleeved on splined shaft;

Described deflector rod device comprises plectrum, tooth bar, gear, bull stick, bull stick bearing, sealing socket, described plectrum is contained in the both sides of spline housing through measured piece output shaft and driving sleeve, described plectrum moves and can promote spline housing and move and do not affect splined shaft, described plectrum is fixed on the tooth bar that can slide on mounting platform, described wheel and rack engagement, described bull stick and gear centre are fixed, described bull stick is drawn out to outside tank through thermal vacuum tank, described bull stick supporting seat is fixed on mounting platform and supports bull stick, and described bull stick and thermal vacuum tank are sealed by sealing socket;

Described index dial outer circumference surface is carved with the scale mark of circumference in equal parts, and described alidade is carved with evenly divided, and the zero graduation line of described evenly divided is relative with the view window position of thermal vacuum tank side, and described evenly divided has two symmetrical places;

Described index dial periphery along the circumferential direction uniform photosensitive area, described photosensitive area has two places at least.

2. a kind of device for torsion experiment rotation characteristic test in thermal vacuum environment as claimed in claim 1, it is characterized in that: described thermal vacuum tank also comprises cover and tank body, described tank body is by sealing of tank cover, and described transmission shaft, through cover, described thermal vacuum tank casing has view window.

3. a kind of device for torsion experiment rotation characteristic test in thermal vacuum environment as claimed in claim 1, is characterized in that: described view window is installed observation camera lens.