CN104135811A - Multi-probe support capable of moving at three freedom degrees - Google Patents

Abstract

A multi-probe support capable of moving in three degrees of freedom relates to a multi-probe support. The present invention solves the problem that the existing plasma thruster experiment needs to be carried out in a vacuum tank, and the vacuum system needs to be shut down and restarted to replace the probe, which consumes a long time and is prone to experimental errors in different experiments. The stepping motor of the present invention is installed on the lifting platform, the reducer is installed on the lifting platform and connected with the stepping motor, the aluminum alloy end plate, the aluminum alloy wall plate and the stainless steel transmission plate are installed vertically on the aluminum alloy sliding plate in turn, The transmission screw and multiple positioning screws are installed horizontally on the aluminum alloy end plate, aluminum alloy wall plate and stainless steel transmission plate in turn, and the lead pipe is vertically passed through the aluminum alloy top plate, aluminum alloy sliding plate and aluminum alloy long plate in turn, The first DC decelerating motor is installed on the aluminum alloy top plate, and the first DC decelerating motor is connected to the lead pipe through a bevel gear pair transmission. The invention is used in judging plasma thruster experiments.

Description

A multi-probe support that can move in three degrees of freedom

technical field

The invention relates to a diagnostic probe support of a plasma thruster, in particular to a multi-probe support capable of moving in three degrees of freedom.

Background technique

Probe diagnosis is an important diagnostic method in judging plasma thruster experimental measurements. Langmuir probe is the most commonly used low-temperature plasma diagnosis method. With the help of the current-voltage relationship of the probe, the basic plasma Parameters: A series of parameters such as electron density, ion density, electron temperature, plasma space potential, levitation potential and electron energy distribution function, etc., through which the performance parameters of the thruster are evaluated.

In the experimental measurement of the Hall thruster, the probe mainly measures the plasma parameters in the plume area of the Hall thruster, because the plumes ejected by the Hall thruster and the multi-level tangent magnetic field plasma thruster are center-symmetrical along the central axis Therefore, it is only necessary to measure the plasma parameters of a section along the conical generatrix in the plume during the measurement.

When using probe measurement, it is necessary to measure the plasma parameters of different cross-sections, so as to obtain the distribution and variation of the plasma parameters in space, and sometimes it is necessary to use different types of probes to measure different plasma parameters, such as a single probe , double probe, emission probe, multi-gate probe, Faraday probe, etc., but the experiment is carried out in a vacuum tank, and the replacement of the probe requires shutting down and restarting the vacuum system, which takes a long time, and different experiments are prone to experimental errors .

Contents of the invention

The purpose of the present invention is to solve the problem that the existing plasma thruster experiment needs to be carried out in a vacuum tank, and the replacement of the probe needs to close and restart the vacuum system, which consumes a long time and is prone to experimental errors in different experiments. Furthermore, a multi-probe support capable of moving in three degrees of freedom is provided.

The technical solution of the present invention is: a multi-probe support that can move in three degrees of freedom, including a lifting platform, a stepping motor, a reducer, an aluminum alloy long plate, an aluminum alloy sliding plate, an aluminum alloy end plate, and an aluminum alloy wall plate , stainless steel drive plate, aluminum alloy top plate, first DC geared motor, bevel gear pair, lead pipe, probe splint, drive screw, second DC geared motor and multiple positioning screws,

The stepper motor is fixedly installed on the lifting platform, and the lifting platform is fixed in the vacuum tank by bolts, the reducer is installed on the lifting platform and connected with the stepping motor through a coupling, and the aluminum alloy long plate is fixed on the output shaft of the reducer , the aluminum alloy sliding plate can be slidably installed on the aluminum alloy long plate, the aluminum alloy end plate, aluminum alloy wall plate and stainless steel transmission plate are installed vertically on the aluminum alloy sliding plate in turn, and the DC geared motor is installed one distance away from the aluminum alloy end plate On the aluminum alloy sliding plate on the side, the transmission screw rods are horizontally installed on the aluminum alloy end plate, aluminum alloy wall plate and stainless steel transmission plate in turn, and connected with the second DC gear motor through a coupling. It is installed on the aluminum alloy end plate, aluminum alloy wall plate and stainless steel transmission plate and is located around the transmission screw rod. The aluminum alloy top plate is installed on the upper end surface of the aluminum alloy wall plate and the stainless steel transmission plate, and the lead tube passes through it vertically in turn. The aluminum alloy top plate, the aluminum alloy sliding plate and the aluminum alloy long plate, the first DC deceleration motor is installed on the aluminum alloy top plate, the first DC deceleration motor and the lead tube are connected through a bevel gear pair transmission, and the upper end of the lead tube is set With probe clamp.

Compared with the prior art, the present invention has the following effects:

1. The present invention adopts aluminum alloy as material, which is lighter in weight and lower in cost.

2. In the present invention, the motor is placed far away from the plasma plume, which can protect the working motor from corrosion by high-temperature plasma, avoid thermal deposition of the motor, and increase the working life of the motor.

3. The present invention adopts a rotating multi-probe platform, and the distance between the measuring points of each probe is longer, which can minimize the interference effect of the plasma sheath generated by the multi-probe on the measurement results, and the measurement results are accurate Sex is higher.

4. The present invention adjusts the position of the probe according to the position of the point to be measured in space. The probe can reach different angles by controlling the stepping motor, and the probe can reach different angles by controlling the first rotating speed DC deceleration motor. Radius position, different types of probes can be replaced by controlling the second speed of the DC geared motor, and different positions of the probes and different probe types can be easily changed. The plasma parameters of a conical section in space can be compared in many ways Accurate measurement avoids the time and resources consumed by turning off and restarting the vacuum system when changing the probe, and the experimental errors caused by different experiments.

5. The three degrees of freedom of the present invention are achieved in this way: by controlling the motion of the stepper motor on the lifting platform, the probe holder can be rotated in the vertical direction to change the scanning angle of the probe; by controlling the direct current on the rotating arm The movement of the motor can realize the linear movement along the length of the arm and change the distance between the probe and the plasma; by controlling the movement of the DC motor on the slider, the rotation of the probe platform can be realized and the different probes can be changed. needle type.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the assembly of the present invention.

Fig. 2 is a schematic diagram of the assembled appearance of the present invention.

Fig. 3 is a schematic diagram of the appearance of the present invention.

Detailed ways

Specific Embodiment 1: This embodiment is described with reference to Fig. 1-Fig. Plate 4, aluminum alloy sliding plate 5, aluminum alloy end plate 6, aluminum alloy wall plate 7, stainless steel transmission plate 8, aluminum alloy top plate 9, first DC gear motor 10, bevel gear pair 11, lead tube 12, probe Splint 13, transmission screw mandrel 14, second DC geared motor 16 and multiple positioning screw mandrels 15,

The stepper motor 2 is fixedly installed on the lifting platform 1, the lifting platform 1 is fixed in the vacuum tank by bolts, the reducer 3 is installed on the lifting platform 1 and connected with the stepping motor 2 through a coupling, and the aluminum alloy long plate 4 is fixed On the output shaft of the reducer 3, the aluminum alloy sliding plate 5 is slidably installed on the aluminum alloy long plate 4, and the aluminum alloy end plate 6, the aluminum alloy wall plate 7 and the stainless steel transmission plate 8 are vertically installed on the aluminum alloy sliding plate in turn 5, the DC deceleration motor 10 is installed on the aluminum alloy sliding plate 5 on the side away from the aluminum alloy end plate 6, and the transmission screw rod 14 is installed horizontally on the aluminum alloy end plate 6, the aluminum alloy wall plate 7 and the stainless steel transmission plate 8 in turn. and connected to the second DC geared motor 16 through a coupling, and a plurality of positioning screw rods 15 are laid horizontally on the aluminum alloy end plate 6, aluminum alloy wall plate 7 and stainless steel transmission plate 8 in turn, and are located at the center of the transmission screw rod 14. All around, the aluminum alloy top plate 9 is installed on the upper end faces of the aluminum alloy wall plate 7 and the stainless steel transmission plate 8, and the lead tube 12 vertically passes through the aluminum alloy top plate 9, the aluminum alloy sliding plate 5 and the aluminum alloy long plate 4 successively, the first The DC deceleration motor 10 is installed on the aluminum alloy top plate 9, the first DC deceleration motor 10 and the lead pipe 12 are connected by a bevel gear pair 11, and the upper end of the lead pipe 12 is provided with a probe splint 13.

The multi-link mechanism of the lifting platform in this embodiment controls the distance between two intersection points of the connecting rods through bolt connection, thereby controlling the height change of the lifting platform through the link mechanism. It is convenient to meet the adjustment of the probe support in the vertical direction.

This embodiment also includes a stepping motor fixing plate. The cross section of the stepping motor fixing plate is concave, and two through holes are respectively drilled in the thick places on both sides, and are clamped and matched with the stepping motor and the upper table of the lifting platform through bolt connection. . The stepper motor is located between the stepper motor fixing plate and the upper plate of the lifting platform, and the stepping motor fixing plate is fixed on the lifting platform by bolts. By adjusting the height of the lifting platform, the probe can reach a suitable measurement height.

The stepper motor driver of this embodiment is arranged in the circuit outside the vacuum tank, and is connected with the stepper motor inside the vacuum tank through the wire passing through the vacuum tank to control the movement of the stepper motor. The circuit is connected, and the output signal of the stepper motor driver is controlled by the control program on the computer, thereby controlling the movement of the stepper motor. A shaft coupling is connected to the rotating shaft of the stepping motor, and the other end of the coupling is connected to the input shaft of the reducer, which transmits the axial rotation of the stepping motor to the rotation of the whole probe holder along the output shaft of the reducer.

The aluminum alloy long plate of this embodiment is fixed on the output shaft of the reducer through bolt connection, and as the output shaft of the reducer rotates, the positioning plate of the DC geared motor is fixed on one end of the aluminum alloy long plate through bolt connection for fixing The position of the first DC geared motor on the aluminum alloy long plate, the rear splint of the DC geared motor is fixed on the DC geared motor positioning plate through bolt connection, the direction is perpendicular to the DC geared motor positioning plate, and the first DC geared motor is fixed on Between the rear splint of the DC gear motor and the front splint of the DC gear motor.

The number of positioning screw rods in this embodiment is multiple, and the preferred number is 4. The four positioning screw rods pass through the four through holes on the rear splint of the DC geared motor and the front splint of the DC geared motor. The anti-loosening double nuts fix the positions of the rear splint of the DC gear motor, the first DC gear motor and the front splint of the DC gear motor.

In this embodiment, the shaft of the first DC geared motor is connected to another coupling, and the other end of the coupling is connected to a transmission screw, and the transmission screw follows the rotation of the first DC geared motor, and the stainless steel transmission plate passes through the middle The thread is matched with the transmission screw, and the positioning screw passes through the four through holes on the stainless steel transmission plate, which can ensure that the stainless steel transmission plate does not rotate, so the rotation of the transmission screw will be converted into the movement of the stainless steel transmission plate along the aluminum alloy long plate Moving back and forth, the bottom end of the stainless steel transmission plate is in contact with the aluminum alloy long plate, and can slide each other.

The aluminum alloy top plate of this embodiment is fixed on the stainless steel transmission plate through bolt connection, and the direction is perpendicular to the stainless steel transmission plate. The aluminum alloy top plate moves forward and backward on the aluminum alloy long plate along with the stainless steel transmission plate. Place the stainless steel lead tube.

The aluminum alloy wall plate of this embodiment is fixed on the aluminum alloy top plate through bolt connection, the direction is perpendicular to the aluminum alloy top plate, parallel to the stainless steel transmission plate, moves forward and backward on the aluminum alloy long plate following the stainless steel transmission plate, and the positioning screw passes through the aluminum alloy The four through holes on the wall plate, the bottom end of the aluminum alloy wall plate is in contact with the aluminum alloy long plate, and can slide mutually.

The aluminum alloy sliding plate of this embodiment is fixed on the aluminum alloy wall plate and the stainless steel transmission plate through bolt connection, the aluminum alloy sliding plate frictionally slides on the aluminum alloy long plate, and is used to stabilize the position of the probe turret, the aluminum alloy sliding plate The place in contact with the aluminum alloy long plate is rounded to avoid jamming due to excessive friction.

One end of the aluminum alloy long plate in this embodiment is fixed to the DC motor positioning plate by bolts, and a certain point in the long plate is fixed to the reducer by bolts, and the other end is fixed to the aluminum alloy end plate positioning plate by bolts.

The aluminum alloy end plate positioning plate of this embodiment is fixed to the aluminum alloy long plate through bolt connection.

The aluminum alloy end plate of this embodiment is fixed to the positioning plate of the aluminum alloy end plate through bolt connection, and the direction is perpendicular to the positioning plate of the aluminum alloy end plate. The front and rear ends of the plate adopt double nut anti-loosening fit for the positioning screw.

In this embodiment, a stainless steel capillary is placed on the positioning screw at the front part of the front splint of the DC gear motor, and the stainless steel capillary passes through the stainless steel transmission plate and the aluminum alloy wall plate to the rear end surface of the aluminum alloy end plate.

Another positioning plate of the DC geared motor in this embodiment is fixed on the aluminum alloy top plate through bolt connection.

The rear splint of the second DC geared motor in this embodiment is fixed on the positioning plate of the DC geared motor through bolt connection, and the direction is perpendicular to the positioning plate of the DC geared motor.

The second DC geared motor in this embodiment is fixed between the rear splint of the DC geared motor and the front splint of the DC geared motor.

The front protective plate of the DC geared motor in this embodiment is fixed on the aluminum alloy top plate by bolts, so as to protect the second DC geared motor from being corroded by the plasma in the front plume.

The upper protective plate of the DC geared motor in this embodiment is fixed on the front protective plate of the DC geared motor by bolts, so as to protect the second DC geared motor from being corroded by the plasma in the upper plume.

The side protective plate of the DC geared motor in this embodiment is fixed on the upper protective plate of the DC geared motor by bolts, so as to protect the second DC geared motor from being corroded by the plasma in the plume on both sides.

The stainless steel lead pipe of this embodiment is in contact with the aluminum alloy lead channel through the through hole on the aluminum alloy top plate.

The lower splint of the probe in this embodiment is a ring-shaped structure with a boss in the center. The inner ring surface of the boss matches the outer ring surface of the stainless steel lead tube. The radial thickness of the boss is 5mm, and the axial thickness of the boss is 5mm. The diameter is 10mm, and there is a radial threaded hole on the boss, which is tightened with the stainless steel lead tube by tightening the bolt. The inner diameter of the hole surface is the same as the inner diameter of the stainless steel lead pipe, and the outer diameter of the counterbore surface is slightly larger than the outer diameter of the stainless steel lead pipe.

The probe lower splint in this embodiment is uniformly drilled with four axial through holes along the circumferential direction, and the four axial through holes at the same positions on the probe upper splint are clamped by bolts and nuts.

The lower clamping plate of the probe in this embodiment is evenly drilled with four radial semicircular holes along the circumferential direction, and the four radial semicircular holes at the same position as the upper clamping plate of the probe will sandwich the probe between the two semicircular holes. Clamp.

The upper splint of the probe in this embodiment has a circular structure, and there is a countersunk seat in the center. The diameter of the countersunk seat is the same as the outer diameter of the countersunk hole surface on the lower probe splint, and it is convenient to arrange wires in the countersunk seat.

The switch of this embodiment is located outside the vacuum tank, and a plurality of switches are respectively connected to the first DC geared motor and the second DC geared motor in the vacuum tank through the wires passing through the vacuum tank to control the first DC geared motor and the second DC geared motor respectively. Two DC geared motors for forward rotation and reverse rotation.

The power supply of this embodiment is located outside the vacuum tank, and the 24V power supply is connected to the switch through wires.

Specific Embodiment 2: This embodiment is described with reference to FIGS. 1-3 . The multi-probe bracket of this embodiment further includes an aluminum alloy tube 17 , which is fixedly installed on the lower end surface of the aluminum alloy long plate 4 . This is done so that excess wire is not exposed to the plasma plume and burns out. Other compositions and connections are the same as in the first embodiment.

Specific Embodiment Three: This embodiment is described with reference to FIGS. 1-3 . The cross-sectional shape of the aluminum alloy tube 17 in this embodiment is U-shaped. In this way, the two aluminum alloy tube positioning plates in this embodiment are connected by bolts, and are respectively fixed together with the aluminum alloy long plate, the DC gear motor positioning plate, and the aluminum alloy end plate positioning plate, and the aluminum alloy tube positioning plate is fixed on the aluminum alloy tube positioning plate. Below the long plate, there is a through hole in the center of the aluminum alloy tube positioning plate for installing the U-shaped section aluminum alloy tube. In this embodiment, the U-shaped cross-section aluminum alloy tube passes through the through hole in the center of the aluminum alloy tube positioning plate, and is tightened and fixed by bolts. The U-shaped cross-section aluminum alloy tube is lead in the center to prevent redundant wires from being exposed to the plasma plume and being burned. . The aluminum alloy lead wire channel of this embodiment is fixed by bolt connection and aluminum alloy wall plate, one end face fits with the aluminum alloy top plate, and the other end face enters the U-shaped cross-section aluminum alloy tube from the U-shaped notch on the side of the tube. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.

Specific Embodiment Four: This embodiment is described in conjunction with Fig. 1-Fig. The lower plate 1-2 is arranged in parallel, the upper plate 1-1 and the lower plate 1-2 are connected by a multi-link mechanism 1-3, the lower plate 1-2 is fixedly connected to the vacuum tank by bolts, and the upper plate 1-1 A plurality of through holes are opened on it. Such setting facilitates the adjustment of the probe support in the vertical direction. . Other compositions and connections are the same as those in Embodiment 1 or 3.

Embodiment 5: This embodiment is described with reference to FIGS. 1-3 . The gear ratio of the bevel gear pair 11 in this embodiment is 1:2. In this way, the bevel gear with a small number of teeth in the 1:2 bevel gear of this embodiment is clamped and fixed on the shaft of the second DC geared motor by bolts, and the bevel gear follows the rotation of the shaft of the second DC geared motor. The bevel gear with more teeth in the 1:2 bevel gear is clamped and fixed on the stainless steel lead tube by bolts. The bevel gear drives the stainless steel lead tube to rotate by the matching bevel gear. The rotation axes of the two bevel gears are perpendicular to each other. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 4.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can also make other changes within the spirit of the present invention, and be applied to fields not mentioned in the present invention. Of course, These changes made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims (5)

1. One kind can be at the multiprobe support of three-degree-of-freedom motion, it is characterized in that: it comprises lifting platform (1), stepping motor (2), decelerator (3), aluminium alloy long slab (4), aluminium alloy sliding panel (5), aluminium alloy end plate (6), aluminium alloy wallboard (7), stainless steel driver plate (8), aluminum alloy roof plate (9), the first DC speed-reducing (10), bevel gear pair (11), fairlead (12), probe clamping plate (13), drive lead screw (14), the second DC speed-reducing (16) and many positioning screw rods (15)

   Stepping motor (2) is fixedly mounted on lifting platform (1), lifting platform (1) is bolted in vacuum tank, decelerator (3) is arranged on lifting platform (1) above and is connected with stepping motor (2) by shaft coupling, aluminium alloy long slab (4) is fixed on the output shaft of decelerator (3), aluminium alloy sliding panel (5) is slidably arranged on aluminium alloy long slab (4), aluminium alloy end plate (6), aluminium alloy wallboard (7) and stainless steel driver plate (8) are vertically arranged on aluminium alloy sliding panel (5) successively, DC speed-reducing (10) is arranged on the aluminium alloy sliding panel (5) away from aluminium alloy end plate (6) one sides, drive lead screw (14) successively level is located in aluminium alloy end plate (6), aluminium alloy wallboard (7) is gone up and is connected with the second DC speed-reducing (16) by shaft coupling with stainless steel driver plate (8), many positioning screw rods (15) successively level are located in aluminium alloy end plate (6), the surrounding of drive lead screw (14) is gone up and be positioned to aluminium alloy wallboard (7) and stainless steel driver plate (8), aluminum alloy roof plate (9) is arranged on the upper surface of aluminium alloy wallboard (7) and stainless steel driver plate (8), fairlead (12) is successively vertically through aluminum alloy roof plate (9), aluminium alloy sliding panel (5) and aluminium alloy long slab (4), the first DC speed-reducing (10) is arranged on aluminum alloy roof plate (9), between the first DC speed-reducing (10) and fairlead (12), by bevel gear pair (11), be in transmission connection, the upper end of fairlead (12) is provided with probe clamping plate (13).
2. 2. a kind of can, at the multiprobe support of three-degree-of-freedom motion, it is characterized in that according to claim 1: described multiprobe support also comprises aluminium-alloy pipe (17), and aluminium-alloy pipe (17) is fixedly mounted on the lower surface of aluminium alloy long slab (4).
3. 3. a kind of can, at the multiprobe support of three-degree-of-freedom motion, it is characterized in that according to claim 2: the shape of cross section of described aluminium-alloy pipe (17) is U-shaped.
4. According to a kind of described in claim 1,2 or 3 can be at the multiprobe support of three-degree-of-freedom motion, it is characterized in that: described lifting platform (1) comprises upper plate (1-1), lower plate (1-2) and multi-connecting-rod mechanism (1-3), upper plate (1-1) and lower plate (1-2) be arranged in parallel, between upper plate (1-1) and lower plate (1-2), by multi-connecting-rod mechanism (1-3), connect, lower plate (1-2) is bolted with vacuum tank and is fixedly connected with, and on upper plate (1-1), offers a plurality of through holes.
5. 5. according to a kind of can, at the multiprobe support of three-degree-of-freedom motion, it is characterized in that described in claim 1 or 4: the gear ratio of bevel gear pair (11) is 1:2.