CN203551255U - High-precision seal test device in thermal vacuum environment - Google Patents

Abstract

A high-precision sealing test device in a thermal vacuum environment, including an adjustment base, an observation group, a lever device, a connecting spline, and a thermal vacuum box. The adjustment base is installed in the thermal vacuum box, and the test piece is installed on the adjustment base. The piece to be tested is connected to the output shaft of the piece to be tested. The output shaft of the piece to be tested is connected to the magnetic fluid seal transmission shaft through the connecting spline. The device is installed in a thermal vacuum box, and an observation group is arranged on the wall of the thermal vacuum box. The utility model adopts an observation lens to observe and record the position of the output shaft of the test piece, uses a lever device to control the disengagement between the output shaft of the test piece and the magnetic fluid seal transmission shaft, and adjusts the temperature of the test piece in the thermal vacuum by adjusting the machine base. The spatial position in the tank effectively avoids the influence of the deformation of the test piece on the test in the thermal vacuum test. It is suitable for high-precision sealing transmission testing in a thermal vacuum environment, with simple operation and high precision.

Description

High-precision sealing test device in thermal vacuum environment

technical field

The utility model relates to a high-precision sealing test device 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. the

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 box 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 test piece is connected with the magnetic fluid seal transmission shaft to lead out to the outside normal temperature environment. the

The parts to be tested need to be subjected to thermal vacuum tests at different temperatures, that is, after the test is completed at a certain constant temperature, the temperature is raised or lowered, and the next test is performed after the temperature is stable. During the test process, the thermal vacuum box is always in a sealed state, so it is very difficult to adjust the DUT in the box. Both the test piece and the base are asymmetrical pieces, so in the thermal vacuum environment, the test piece will produce irregular deformation, which will make the axis position of the output shaft shift, thus affecting its connection with the magnetic fluid seal transmission shaft . Furthermore, when measuring the no-load characteristics of the DUT, it is necessary to perform torque loading on the DUT, and then disengage the output shaft of the DUT from the loading device outside the tank to release it freely. The connection between the sealed drive shaft and the loading device 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 drive shaft is directly disconnected in the tank, the test result will be accurate. However, it is not easy to operate under the influence of the heated vacuum tank. the

Contents of the invention

In order to solve the problems that the deformation of the test piece in the thermal vacuum test affects the test, and the test of the no-load characteristics of the test piece in the thermal vacuum environment is difficult to operate, the utility model provides a conveniently operable machine that is not affected by the deformation of the test piece High-precision sealing test device in thermal vacuum environment. the

The technical scheme that the utility model solves its technical problem adopts is:

A high-precision sealing test device in a thermal vacuum environment, including an adjusting machine base, an observation group, a lever device, a connecting spline, and a thermal vacuum box. The adjustment machine base is installed in the thermal vacuum box, the test piece is installed on the adjustment machine base, the test piece is connected to the output shaft of the test piece, and the output shaft of the test piece is connected to the magnetic fluid seal by connecting splines. The transmission shaft, the magnetic fluid sealed transmission shaft is drawn out of the box through the thermal vacuum box; the connecting spline is connected to the lever device, and the lever device is installed in the thermal vacuum box; the box wall of the thermal vacuum box is set There are observation groups. the

The adjusting base includes a workpiece fixing plate, a device fixing plate, a driving shaft, a driven shaft, a driving gear, a driven gear, and a clutch. The workpiece fixing plate and the device fixing plate are supported by driven shafts. There are at least three driven shafts. Double floating joints are installed between the driven shafts and the workpiece fixing plate. The driven shafts and the device fixing plate They are connected by rolling bearings; the driven gears are sleeved on the driven shaft, and the positions of the driven gears are staggered in the axial direction. the

The driving shaft is installed in the center of the device fixing plate through a bearing, the driving gear can be axially slidably sleeved on the driving shaft, the rotation of the driving shaft can drive the driving gear to rotate, and the driving gear can mesh with the driven gear . The gear adjustment plate is set outside the drive shaft, and the gear adjustment plate does not contact the drive shaft. The gear adjustment plate supports the drive gear in the axial direction, and the other end of the gear adjustment plate is set on the lifting screw through a threaded hole. On the column, the lifting stud is installed on the device fixing plate through bearings. the

The clutch includes a driving disk and a driven disk, the driven disk is fixed under the workpiece fixing plate, the driving disk is fixed on the driving gear, when the driving disk and the driven disk of the clutch are engaged, the driving disk is rotated The shaft can drive the workpiece fixing plate to rotate. the

The drive shaft and the lower end of the lifting stud are respectively connected with two flexible shafts led out of the thermal vacuum box through a device fixing plate. the

The lower end of the fixed plate of the device is set on the moving screw and the moving shaft through the moving seat and the slider. The moving screw and the moving shaft are installed in parallel and fixed with the thermal vacuum box. One end of the moving screw is drawn out through the thermal vacuum box through the sealing device. out of the box. the

The end of the output shaft of the test piece and the top end of the ferrofluid seal transmission shaft are fitted with a spline shaft respectively, and the spline sleeve is fitted on the spline shaft. the

The lever device includes a lever, a rack with sliding shafts at both ends, a gear, and a rotating shaft. The rack with sliding shafts at both ends is fixed on the lever mounting plate through the mounting seat of the sliding shaft, the center of the gear is fixed with the rotating shaft and meshed with the rack, and the rotating shaft is led out of the thermal vacuum box through the sealing sleeve. There are two picks and they are vertically fixed on the rack. The picks respectively pass through the output shaft of the test piece and the magnetic fluid seal transmission shaft and are fitted on the two ends of the spline sleeve. The picks can move with the rack. Push the spline sleeve without affecting the spline shaft. the

The observation group is installed on the top and side of the thermal vacuum box and is opposite to the side position of the output shaft of the test piece; the observation group includes an observation lens and an observation window; the observation lens includes an eyepiece, a liquid crystal reticle, and an objective lens. The liquid crystal reticle is installed between the eyepiece and the objective lens, and the liquid crystal reticle can display two parallel scale lines and a center line with adjustable spacing under the control of an external power supply. the

The thermal vacuum box also includes a box cover and a box body, the box body is sealed by the box cover, and the magnetic fluid seal transmission shaft passes through the box cover. the

The testing method of the present utility model is:

1. In a non-vacuum environment at room temperature, clamp the piece to be tested on the workpiece fixing plate of the adjustment machine base, and connect the output shaft of the piece to be tested with the magnetic fluid seal transmission shaft through a spline. the

2. Adjust the observation lens on the top and side of the thermal vacuum box so that the output shaft of the DUT can be clearly observed, and then adjust the two scale lines on the liquid crystal reticle of the observation lens to coincide with the output shaft edge , take the centerline on the LCD reticle at this time as the benchmark for subsequent adjustments. the

3. Turn the rotating shaft of the lever device, the gear on the rotating shaft drives the rack to move, and the spline sleeve is shifted to the side of the transmission shaft through the paddle on the rack, and the connection between the output shaft of the test piece and the transmission shaft is released. make it free. the

4. Seal the thermal vacuum box, and test it when it reaches the required temperature and vacuum environment for the test. the

5. After the temperature is stable, observe the deformation offset of the output shaft of the DUT through the observation lens. the

6. The rotating flexible shaft can drive the rotation of the lifting stud and the driving shaft in the thermal vacuum box, select the gear or clutch to be meshed through the lifting stud, and then rotate the driving shaft to adjust the lifting or rotation of the workpiece fixing plate to Adjust the spatial position of the workpiece to be tested on the workpiece fixing plate. the

7. Keep the position of the reference center line in the liquid crystal reticle unchanged, expand or reduce the distance between the two scale lines in the reticle equidistantly, cooperate with the adjustment machine base to move or rotate the test piece until two parallel The scale line coincides with the edge of the output shaft again. At this time, it can be considered that the axis of the output shaft of the test piece coincides with the axis of the magnetic fluid seal transmission shaft. the

8. Turn the rotating shaft of the lever device, turn the spline sleeve to the output shaft side of the test piece, and reconnect the output shaft of the test piece and the magnetic fluid seal shaft. Carry out performance tests such as driving or loading of the DUT. the

9. Repeat steps 2 to 8 to perform performance tests of the DUT at different temperatures. the

Design thinking and advantages of the present utility model are as follows:

Affected by the thermal vacuum environment, the test piece will produce irregular deformation, which will affect the connection between the output shaft of the test piece and the test device outside the tank. the

The utility model adopts an observation lens to observe and record the position of the output shaft of the test piece, uses a lever device to control the disengagement between the output shaft of the test piece and the magnetic fluid seal transmission shaft, and adjusts the temperature of the test piece in the thermal vacuum by adjusting the machine base. Spatial position in the tank. Therefore, the observation lens records the initial position of the output shaft of the DUT in a normal temperature environment, and then disengages its connection with the magnetic fluid seal transmission shaft through the lever device, allowing the DUT to deform freely in a thermal vacuum environment. Finally, adjust the machine base through the observation lens so that the axes of the output shaft of the test piece and the magnetic fluid seal transmission shaft coincide again, and then connect the output shaft of the test piece and the magnetic fluid seal transmission shaft through the lever device for subsequent testing. After the loading of the test piece is completed, the connection between the output shaft of the test piece and the magnetic fluid seal transmission shaft can also be disconnected through the lever device, so as to facilitate the test of no-load characteristics. the

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 of the test piece and the magnetic fluid seal transmission shaft respectively. The spline sleeve is set on the spline shaft. The picks are located on both sides of the spline sleeve. One side of the shaft moves, and the connection between the spline sleeve and the spline shaft on the output shaft of the test piece can be released, so that the output shaft of the test piece can be released freely; One side of the output shaft of the test piece moves to re-engage the spline sleeve with the spline shaft on the output shaft of the test piece. The lever device can realize disconnection and connection between the output shaft of the test piece and the magnetic fluid seal transmission shaft. the

Five degrees of freedom can be achieved by adjusting the machine base. The piece to be tested is fixed on the workpiece fixing plate, the output axial direction of the piece to be tested is set as the x direction, and the direction perpendicular to the workpiece fixing plate is the y direction. The bottom of the workpiece fixing plate is supported by at least three driven shafts, and double floating joints are installed between the driven shaft and the workpiece fixing plate, and the upper end of the driven shaft is screwed to the double floating joints, so rotating the driven shaft can realize double floating joints Lifting, more than three driven shafts cooperate with each other to realize the y-direction movement of the workpiece fixing plate and the x- and z-direction rotation. the

Double floating joints have multiple degrees of freedom, so that when adjusting a single driven axis, it is not constrained by other driven axes. The driven gear is set on the driven shaft and its position is staggered in the axial direction. The rotating flexible shaft can drive the rotation of the lifting stud and the driving shaft in the thermal vacuum box. The axial movement of the driving gear is controlled by the lifting stud, and the meshing is selected. The driven gear rotates the driving shaft to drive the driven shaft to rotate. the

The driving disc and the driven disc of the clutch are respectively fixed above the driving gear and below the workpiece fixing plate, and the driving gear is controlled to rise so that the driving disc and the driven disc of the clutch mesh, and then the driving shaft can be rotated to realize the workpiece fixing plate. Rotate in the y direction. The lower end of the device fixing plate is sleeved on the moving screw and the moving shaft installed along the z direction through the moving seat and the slider, so the moving screw can be rotated to realize the z moving of the adjustment machine base. The movement and rotation of the test piece around the x-axis direction does not affect the connection between the spline shaft and the spline sleeve, so it can be ignored. The deformation of the test piece in the thermal vacuum environment is not very large, and the adjustment base can meet the adjustment of its five degrees of freedom. the

The output shaft in the thermal vacuum box cannot be centered, so auxiliary tools must be used. Since the liquid crystal reticle can display two parallel scale lines and the center line with adjustable spacing under the control of an external power supply, so adjust the two scale lines on the liquid crystal reticle of the observation lens so that it coincides with the sideline of the output axis. The position of the centerline of the output shaft can be obtained. Through the mutual cooperation of the two observation lenses on the top and side of the thermal vacuum box, the changes in the directions of the four degrees of freedom of the output shaft of the test piece can be observed to meet the adjustment requirements. the

Description of drawings

Figure 1 is a schematic diagram of a high-precision sealing test device in a thermal vacuum environment

Figure 2 is the left view of Figure 1

Figure 3 is a top view of Figure 1

Detailed ways

In conjunction with accompanying drawings 1 to 3, a high-precision sealing test device in a thermal vacuum environment includes an adjustment base, an observation group 3, a lever device, and a connecting spline. The adjusting base is installed in the thermal vacuum box, the connecting spline connects the output shaft 9 of the test piece and the magnetic fluid seal transmission shaft 6, the lever device is fixed in the thermal vacuum box and the paddle acts on the connecting spline On the key, the observation group 3 is installed on the top and side of the thermal vacuum box and is opposite to the side position of the output shaft 9 of the test piece. the

The adjusting machine base includes a workpiece fixing plate 23, a device fixing plate 15, a driving shaft 16, a driven shaft 22, a driving gear 21, a driven gear 14, a clutch and the like. Four driven shafts 22 are supported between the workpiece fixing plate 23 and the device fixing plate 15, and double floating joints 12 are installed between the driven shafts 22 and the workpiece fixing plate 23, and the driven shaft 22 and the device fixing plate 15 are connected by rolling bearings; the driven gear 14 is sleeved on the driven shaft 22, and the positions of the driven gears 14 are staggered in the axial direction. the

The driving shaft 16 is mounted on the center of the device fixing plate 15 through a bearing, and the driving gear 21 is axially slidably sleeved on the driving shaft 16, and the rotation of the driving shaft 16 can drive the driving gear 21 to rotate. 21 can mesh with driven gear 14. One end of the gear adjusting plate 13 is set on the driving shaft 16 without contact with the driving shaft 16. The gear adjusting plate 13 supports the driving gear 21 in the axial direction, and the other end of the gear adjusting plate 13 is set through a threaded hole. On the lifting stud 29, the lifting stud 29 is mounted on the device fixing plate 15 through a bearing. the

Described clutch comprises driving disk 7 and driven disk 24, and described driven disk 24 is fixed on the below of workpiece fixing plate 23, and described driving disk 7 is fixed on the driving gear 21, when the driving disk 7 of clutch and driven disk 24 are engaged, rotating the drive shaft 16 can drive the workpiece fixing plate 23 to rotate. the

The lower ends of the driving shaft 16 and the lifting stud 29 are respectively connected with two flexible shafts 18, 32 drawn out of the thermal vacuum box through the device fixing plate 15. the

The lower end of the device fixing plate 15 is sleeved on the moving screw 20 and the moving shaft 17 through the moving seat 19. The moving screw 20 and the moving shaft 17 are installed in parallel and fixed with the thermal vacuum box body 1. One end of the moving screw 20 Through the sealing device 25, pass through the thermal vacuum box casing 1 and lead to the outside of the box. the

The end of the output shaft 9 of the test piece and the top end of the ferrofluid-sealed transmission shaft 6 are fitted with a spline shaft 33 respectively, and the spline sleeve 11 is fitted on the spline shaft 33 . the

The lever device includes a dial 10 , a rack 30 with sliding shafts at both ends, a gear 28 and a rotating shaft 26 . The rack 30 with sliding shafts at both ends is fixed on the lever mounting plate 27 through the sliding shaft mount 31, the center of the gear 28 is fixed to the rotating shaft 26 and meshed with the rack 30, and the rotating shaft 26 is connected to the sealing sleeve 25 Lead out of the thermal vacuum box, the pick 10 has two pieces and is vertically fixed on the rack 30, the pick 10 passes through the output shaft 9 of the test piece and the magnetic fluid seal transmission shaft 6 respectively and is set on the spline sleeve 11, the plectrum 10 moves with the rack 30 to push the spline sleeve 11 without affecting the spline shaft 33. the

The observation group includes an observation lens 3 and an observation window 2 . The observation lens 3 includes an eyepiece 34, a liquid crystal reticle 35, and an objective lens 36. The liquid crystal reticle 35 is installed between the eyepiece 34 and the objective lens 36. The liquid crystal reticle 35 can display two Parallel scale marks and center line with adjustable bar spacing. the

The thermal vacuum box also includes a box cover 4 and a box body 1 , the box body 1 is sealed by the box cover 4 , and the magnetic fluid seal transmission shaft 6 passes through the box cover 4 . the

Claims (2)

1. the close tolerance seal proving installation under hot vacuum environment, is characterized in that: comprise and regulate support, observation group, deflector rod device, connection spline, thermovacuum case; Described adjusting support is arranged in thermovacuum case, on described adjusting support, installs to be measured, and described to be measured connects to be measured output shaft, and described to be measured output shaft is by connecting spline joint transmission shaft, and described transmission shaft is drawn out to outside case through thermovacuum case; Described connection spline joint deflector rod device, described deflector rod device is arranged in thermovacuum case; The tank wall of described thermovacuum case is provided with observation group;

Described adjusting support comprises Workpiece fixing plate, device fixed head, main drive shaft, driven shaft, driving gear, follower gear, clutch coupling; Between described Workpiece fixing plate and device fixed head, by driven shaft, support, described driven shaft has three at least, and two floating junctions are installed between described driven shaft and Workpiece fixing plate, and described driven shaft is connected by rolling bearing between propping up with device fixed head; Described follower gear is sleeved on driven shaft, and described multiple follower gears stagger position in the axial direction;

Described main drive shaft is arranged on the center of device fixed head by bearing, described driving gear can be sleeved on main drive shaft in axial sliding, and described main drive shaft rotation can drive driving gear rotation, and described driving gear can engage with follower gear; The outer set gear adjustable plate of described main drive shaft, between described gear adjustable plate and main drive shaft, do not contact, described gear adjustable plate supports driving gear in the axial direction, the described gear adjustable plate other end is sleeved on lifting double-screw bolt by threaded hole, and described lifting double-screw bolt is arranged on device fixed head by bearing;

Described clutch pack is containing driving disc spacing pressing and clutch plate, and described clutch plate is fixed on the below of Workpiece fixing plate, and described driving disc spacing pressing is fixed on driving gear, when after the driving disc spacing pressing and clutch plate engagement of clutch coupling, rotates described main drive shaft and can drive Workpiece fixing plate rotation;

Described main drive shaft and lifting double-screw bolt lower end are connected with two flexible axles that are drawn out to outside thermovacuum case respectively by device fixed head;

Described device fixed head lower end is contained on mobile screw and shifting axle by Mobile base and slide block set, described mobile screw installation parallel with shifting axle and fixing with thermovacuum case, and described mobile screw one end is passed thermovacuum case by packoff and is drawn out to outside case;

Described to be measured output shaft end and magnetic fluid seal driving axle top are set with splined shaft, and described spline housing is sleeved on splined shaft;

Described deflector rod device comprises tooth bar, gear, the rotating shaft of plectrum, two ends band sliding axle; The tooth bar of described two ends band sliding axle is fixed on driving lever installing plate by sliding axle mount pad, described gear centre is fixed with rotating shaft and is engaged with tooth bar, the logical sealing shroud of described rotating shaft is drawn out to outside thermovacuum case, described plectrum has two and be vertically fixed on tooth bar, described plectrum is contained in respectively the two ends of spline housing through to be measured output shaft and magnetic fluid seal driving axle sleeve, described plectrum moves and can promote spline housing and do not affect splined shaft with tooth bar;

Described observation group is arranged on thermovacuum case top and side and relative with to be measured output shaft lateral location; Described observation group comprises observation camera lens and view window; Described observation camera lens comprises eyepiece, liquid crystal graticule, object lens, and described liquid crystal graticule is arranged between eyepiece and object lens, and described liquid crystal graticule can show parallel scale mark and the center line that two stripe pitch are adjustable under additional power source control.

2. the close tolerance seal proving installation under hot vacuum environment as claimed in claim 1, is characterized in that: described thermovacuum case also comprises case lid and casing, and described casing seals by case lid, and described magnetic fluid seal driving axle is through case lid.

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