CN108593183A - Micromass cell culture device based on bearing - Google Patents

Abstract

The invention discloses a bearing-based micro-thrust measuring device, comprising: an outer frame, a vibrating inner frame, an elastic pivot, and a beam, the vibrating inner frame is accommodated and installed in the outer frame, and the elastic pivot is installed along the axial direction of the vibrating inner frame On the opposite surface of the vibrating inner frame, and respectively connected with the outer frame; the beam runs through the vibrating inner frame along the radial direction of the vibrating inner frame, and extends outward to the outer frame to form a storage end; the elastic pivots are respectively sleeved with bearings, elastic The pivot and the bearing are respectively connected with the outer frame. The device uses bearings to carry the mass of the thruster and counterweight to be tested, so that it can be used to measure various types of thrusters weighing more than 50kg, such as realizing direct measurement of the thrust generated by large-weight electric micro-thrusters such as ions and Hall.

Description

Bearing-based Micro Thrust Measuring Device

technical field

The invention relates to a bearing-based micro-thrust measuring device, which belongs to the field of spacecraft micro-propulsion.

Background technique

Thrust is an important propulsion performance index of a micro thruster. Thrust performance must be evaluated during the design, development and application stages of microthrusters. Generally, the thrust performance evaluation uses measuring devices such as torsion pendulum and pendulum to carry out direct measurement. Since the torsion pendulum system can separate thrust and gravity and is insensitive to longitudinal vibration, it is a common measurement device in micro-thrust measurement.

Under the action of thrust, the torsion pendulum system converts the thrust into the rotation angle of the beam of the rotating part for direct measurement. However, in the torsional micro-thrust measurement system, the object to be measured needs to be placed directly on the rotating platform, and the elastic pivot of the rotating platform that bears the weight of the thruster and the beam is easily affected by the thruster during the measurement process due to the limitation of the maximum self-bearing weight. Due to weight limitations, especially for large-mass micro-thrusters, it is difficult for the torsion system with elastic pivots to take advantage of its advantages in micro-thrust measurement. On the other hand, when performing micro-thrust measurements on the ground, in order to avoid the interference of external cables on the thrust measurement device, it is necessary to place the thruster cavity, power supply, working medium storage box and other components on the beam of the thrust measurement device as a whole. The carrying capacity of the torsion micro-thrust measuring device is very limited.

Contents of the invention

According to one aspect of the present invention, a bearing-based micro-thrust measuring device with a large bearing mass and a simple structure is provided. The device uses bearings to carry the mass of the thruster and counterweight to be tested, so that it can be used to measure various thrusters weighing more than 50kg, such as realizing direct measurement of the thrust generated by large-weight electric micro-thrusters such as ions and Hall.

The bearing-based micro-thrust measurement device includes: an outer frame, a vibrating inner frame, an elastic pivot, and a crossbeam, the vibrating inner frame is accommodated and installed in the outer frame, and the elastic pivot is arranged along the vibrating inner frame. Axially installed on the opposite surface of the vibrating inner frame, and respectively connected with the outer frame; the beam penetrates the vibrating inner frame along the radial direction of the vibrating inner frame, Extending to form a storage end; the elastic pivots are respectively sleeved with bearings, and the elastic pivots and the bearings are respectively connected with the outer frame.

Preferably, the middle part of the outer frame is provided with a through groove penetrating the outer frame radially, and the vibrating inner frame is accommodated in the through groove.

Preferably, the outer frame includes a first installation hole and a second installation hole, the first installation hole and the second installation hole are respectively provided on the top surface and the bottom surface of the outer frame, and the first installation hole penetrating through the outer frame along the axial direction of the outer frame; the second installation hole penetrating through the outer frame along the axial direction of the outer frame.

Preferably, the bearing-based micro-thrust measuring device further includes an upper pivot sleeve and a lower pivot sleeve, the upper pivot sleeve is installed in the first installation hole, and the upper pivot sleeve clamps the The first end of the elastic pivot; the lower pivot sleeve is installed in the second installation hole, and the lower pivot sleeve clamps the second end of the elastic pivot.

Preferably, the lower pivot sleeve includes a first lower pivot sleeve and a second lower pivot sleeve, and the first lower pivot sleeve and the second lower pivot sleeve engage radially along the second mounting hole The second end of the elastic pivot.

Preferably, the bearing-based micro-thrust measuring device further includes a shaft component, the shaft component is sleeved on the elastic pivot, and the bearing is sleeved on the shaft component.

Preferably, the shaft component includes a first shaft component and a second shaft component, the first shaft component is sleeved on the first end of the elastic pivot; the second shaft component is sleeved on the elastic pivot on the second end of the pivot.

Preferably, the bearing-based micro-thrust measuring device further includes a bearing positioning block, the bearing positioning block includes a clamping ring and a fixing protrusion; the fixing protrusion is arranged on the outer wall of the clamping ring; the The inner wall of the clamping ring clamps the bearing, and the fixing projection is fixedly connected with the outer frame.

Preferably, the bearing positioning block includes an upper bearing positioning block and a lower bearing positioning block; the upper bearing positioning block clamps the bearing on the first end of the elastic pivot and is fixedly connected with the outer frame; The lower bearing positioning block clamps the bearing on the second end of the elastic pivot and is fixedly connected with the outer frame. The bearing is fixed to the outer frame through the bearing positioning block, so as to effectively share the weight borne by the beam through the bearing.

Preferably, it is characterized in that the bearing is a thrust bearing and/or a radial bearing.

Preferably, a radial bearing is sleeved on the first end of the elastic pivot; a thrust bearing and a radial bearing are sleeved on the second end of the elastic pivot. Radial bearings are assembled with shaft components by clearance fit.

Preferably, the bearing-based micro-thrust measuring device further includes a counterweight, a thruster mounting plate, an inclination sensor, a plurality of actuators and a base, and the counterweight and the thruster mounting plate are respectively arranged on the storage on the end; the outer frame is installed on the base; the inclination sensor is installed on the base and measures the rotation angle of the base; the actuator is separately arranged on the outside of the storage end and fixed on on the base.

The beneficial effects of the present invention include but are not limited to:

(1) The micro-thrust measurement device based on bearings provided by the present invention adopts thrust bearings and radial bearings to be respectively sleeved on the two ends of the elastic pivot, as the bearing of the beam, the vibrating inner frame, the counterweight and the thruster, which can The axial load bearing capacity of the elastic pivot is greatly reduced, thereby improving the bearing capacity of the device.

(2) The bearing-based micro-thrust measurement device provided by the present invention adopts the bearing positioning block arranged radially along the radial bearing, and after the radial bearing is clamped, the radial bearing is fixedly connected with the outer frame, which can facilitate the installation of the bearing Disassembly and replacement.

(3) In the micro-thrust measuring device based on bearings provided by the present invention, the two ends of the elastic pivot are sequentially sleeved with a shaft part and a pivot sleeve for clamping the shaft part, and various The elastic pivot of the torque is replaced, so as to form a rich variety of torsion measurement device torque range, and realize the cross-range measurement of micro thrust.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of a bearing-based micro-thrust measuring device in a preferred embodiment of the present invention;

Fig. 2 is a three-dimensional schematic diagram of an outer frame in a preferred embodiment of the present invention;

Fig. 3 is a three-dimensional schematic diagram of the vibration inner frame assembly in the preferred embodiment of the present invention;

Fig. 4 is a three-dimensional schematic diagram of a vibrating inner frame in a preferred embodiment of the present invention;

Fig. 5 is a three-dimensional schematic diagram of the installation state of one end of the elastic pivot in the preferred embodiment of the present invention;

Fig. 6 is a schematic perspective view of one end of the elastic pivot in a preferred embodiment of the present invention;

Fig. 7 is a schematic perspective view of the assembled state of the bearing-based micro-thrust measuring device in the preferred embodiment of the present invention.

List of part names and reference numbers:

Detailed ways

The present invention is described in detail below in conjunction with examples, but the present invention is not limited to these examples.

Referring to FIG. 1 , the present invention provides a bearing-based micro-thrust measuring device, including: an outer frame 100 , a vibrating inner frame 200 , an elastic pivot 300 , and a beam 400 . The elastic pivot 300 is installed on the top surface and the bottom surface of the vibration inner frame 200 along the axial direction of the vibration inner frame 200 . The vibrating inner frame 200 is installed in the outer frame 100 . Two ends of the elastic pivot 300 are respectively installed in the top surface and the bottom surface of the outer frame 100 . The axes of the outer frame 100, the vibrating inner frame 200, and the elastic pivot 300 are coincident. The resilient pivot 300 provides a restoring force in the measuring device. The beam 400 penetrates the vibrating inner frame 200 along the radial direction of the vibrating inner frame 200 , and extends equidistantly and symmetrically outward from the outer frame 100 to form a storage end.

Bearings are sheathed on the elastic pivots 300 respectively, and the elastic pivots 300 and the bearings are respectively connected with the outer frame 100 .

The invention effectively improves the load-bearing capacity of the measuring device by using the bearing as the load-bearing body. The counterweight 500 and the thruster mounting plate 600 are respectively arranged on the storage end of the beam 400 as required. The inclination sensor 700, the actuator 800 and the base 900 can be adjusted and installed according to specific needs. Here, the installation method of the bearing and the elastic pivot 300 can be installed according to an existing method.

Referring to FIG. 2 , preferably, the middle part of the outer frame 100 is provided with a through groove penetrating through the outer frame 100 along the radial direction of the outer frame 100 , and the vibrating inner frame 200 is accommodated in the through groove.

Preferably, the outer frame 100 is provided with a first installation hole and a second installation hole, the first installation hole is arranged on the top surface of the outer frame 100, and penetrates the outer frame 100 along its axial direction; the second installation hole is arranged on the outer The bottom surface of the frame 100 penetrates through the outer frame 100 along its axial direction.

Preferably, the first end of the elastic pivot 300 is accommodated in the first installation hole; the second end of the elastic pivot 300 is accommodated in the second installation hole.

Preferably, the upper pivot sleeve 101 is installed in the first installation hole, and the upper pivot sleeve 101 clamps the first end of the elastic pivot 300; the lower pivot sleeve is installed in the second installation hole, and the lower pivot sleeve clamps the elastic pivot. the second end of the shaft 300.

More preferably, in order to improve the load-bearing capacity, the lower pivot sleeve includes a first lower pivot sleeve 102 and a second lower pivot sleeve 103, and the first lower pivot sleeve 102 and the second lower pivot sleeve 103 are arranged along the second installation aperture. The second end of the elastic pivot 300 is embraced and accommodated in the second installation hole.

Preferably, a shaft part 202 is further included, the shaft part 202 is sleeved on the elastic pivot 300 , and the bearing is sleeved on the shaft part 202 .

More preferably, the shaft part 202 also includes a first shaft part and a second shaft part, the first shaft part is sleeved on the first end of the elastic pivot 300; the second shaft part is sleeved on the second end of the elastic pivot 300 serve.

By setting the shaft part 202 and the pivot sleeve, on the one hand, the elastic pivot 300 is prevented from being directly worn by the bearing, and on the other hand, it is convenient to replace the elastic pivot 300 as required.

Referring to Fig. 4, preferably, it also includes a bearing positioning block, the bearing positioning block includes a clamping ring and a fixing protrusion; the fixing protrusion is arranged on the outer wall of the clamping ring; the inner wall of the clamping ring clamps the bearing, and the fixing protrusion and the fixing protrusion The outer frame 100 is fixedly connected.

Mounting positions are separately provided in the first mounting hole and the second mounting hole on the outer frame 100 as required, so as to facilitate the mounting of the fixing bumps.

2-4, preferably, the bearing positioning block includes an upper bearing positioning block and a lower bearing positioning block; the upper bearing positioning block clamps the bearing on the first end of the elastic pivot 300 and is fixedly connected with the outer frame 100; the lower bearing The positioning block clamps the bearing on the second end of the elastic pivot 300 and is fixedly connected with the outer frame 100 . The bearing is fixed to the outer frame 100 through the bearing positioning block, so as to effectively share the weight borne by the beam 400 through the bearing.

Referring to Fig. 3, in a specific embodiment, the upper bearing positioning block includes a first upper bearing positioning block 104 and a second upper bearing positioning block 105, and the first upper bearing positioning block 104 and the second upper bearing positioning block 105 are clamped on on the outer wall of the bearing. The lower bearing positioning block includes a first lower bearing positioning block 106 and a second lower bearing positioning block 107, and the first lower bearing positioning block 106 and the second lower bearing positioning block 107 are clamped on the outer wall of the bearing.

Referring to FIG. 4 , in order to improve the load-bearing capacity of the elastic pivot 300 , the bearings sleeved on the elastic pivot 300 are preferably thrust bearings 205 and/or radial bearings.

More preferably, the second end of the elastic pivot 300 is sleeved with the thrust bearing 205 and the radial bearing; the first end of the elastic pivot 300 is sleeved with the radial bearing. The second end of the elastic pivot 300 is the bottom surface of the vibrating inner frame 200, which can improve the load-bearing capacity. Preferably, the thrust bearing 205 is arranged outside the radial bearing.

A washer 206 is also included, and the washer 206 is arranged between the thrust bearing 205 and the radial bearing, and sleeved on the shaft member 202 . Play the role of anti-wear.

The present invention cleverly utilizes the advantage that the bearing can carry a large load, and uses the radial bearing 204 and the thrust bearing 205 as load-bearing carriers, which significantly increases the loading quality of the micro-thruster and its supporting equipment.

In a specific embodiment, the radial bearing includes a first radial bearing and a second radial bearing, the first radial bearing is sleeved on the first end of the elastic pivot 300; the second radial bearing is sleeved on the elastic On the second end of the pivot 300.

In a specific embodiment, referring to FIGS. 5-6 , a shaft member 202 is sleeved on the second end of the elastic pivot 300, and a bearing is sleeved on the shaft member 202 (here, radial bearings and thrust bearings stacked in sequence) Bearing 205, thrust bearing 205 is sleeved below the centripetal bearing) the outside of bearing is clamped by lower bearing positioning block block. The installation projection on the outer wall of the lower bearing positioning block is fixedly connected with the second installation hole. The lower pivot sleeve is accommodated in the first installation hole and is fixedly connected with the outer frame 100 . The top of the shaft member 202 is clamped by the lower pivot sleeve so as to be connected with the outer frame 100 .

Referring to Fig. 7, it also includes a counterweight 500, a thruster mounting plate 600, an inclination sensor 700, a plurality of actuators 800 and a base 900, and the counterweight 500 and the thruster mounting plate 600 are respectively arranged at both ends of the beam 400; the outer frame 100 is installed on the base 900; the inclination sensor 700 is installed on the base 900, and measures the rotation angle of the base 900;

After the measuring device is combined in this way, accurate measurement of various micro-thrusts can be realized.

The present invention will be described in detail below in conjunction with specific embodiments.

Referring to Fig. 7, in a specific embodiment, the present invention provides a bearing-based micro-thrust measurement device, including: an outer frame 100, a vibrating inner frame 200, an elastic pivot 300, a beam 400, a counterweight 500, and a thruster The plate 600 , the inclination sensor 700 , the actuator 800 and the base 900 are installed. The elastic pivot 300 is installed on the top surface and the bottom surface of the vibration inner frame 200 along the axial direction of the vibration inner frame 200 . The vibrating inner frame 200 is installed in the outer frame 100 . Two ends of the elastic pivot 300 are respectively installed in the top surface and the bottom surface of the outer frame 100 . The axes of the outer frame 100, the vibrating inner frame 200, and the elastic pivot 300 are coincident. The beam 400 penetrates the vibrating inner frame 200 and the outer frame 100 along the radial direction of the vibrating inner frame 200 , and extends equidistantly outside the outer frame 100 to form a storage end. A counterweight 500 and a thruster mounting plate 600 are respectively installed on the storage end. The inclination sensor 700 is used to measure the rotation angle of the base 900 relative to the axis of the vibrating inner frame 200 , and is arranged on the base 900 and close to the outer frame 100 . The actuator 800 is arranged symmetrically on the outside of the beam 400 for leveling the base 900 .

When in use, the base 900 is firstly leveled. Afterwards, the thruster is mounted on the thruster mounting plate 600, and a counterweight 500 is set to balance the beam 400 on which the thruster is mounted. Then start the thruster to work, under the action of the torque generated by the thruster, the crossbeam 400 will rotate a certain angle, and at the same time, the elastic pivot 300 will also produce the same torsion angle, according to the rotation of the crossbeam 400 relative to the central axis of the vibrating inner frame 200 Angle, the known stiffness coefficient of the elastic pivot 300, the damping coefficient in the torsional vibration process and other parameters, the force generated by the thruster can be calculated. The measurement of the force generated by the thruster can be carried out according to the existing method.

The above are only a few embodiments of the present invention, and do not limit the present invention in any form. Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Within the scope of the technical solution of the present invention, some changes or modifications made using the technical content disclosed above are equivalent to equivalent implementation cases, and all belong to the scope of the technical solution.

Claims (10)

1. a kind of Micromass cell culture device based on bearing, which is characterized in that including：Outline border, vibration inside casing, resilient pivot, cross Beam, the vibration inside casing receiving are installed in the outline border, and the resilient pivot is axially mounted to institute along the vibration inside casing On the opposite face for stating vibration inside casing, and it is connected respectively with the outline border；The crossbeam is extended radially through along the vibration inside casing The vibration inside casing, and glove end is extended to form to outside the outline border；Bearing, the elasticity are arranged in the resilient pivot respectively Pivot and the bearing are connected with the outline border respectively.

2. the Micromass cell culture device according to claim 1 based on bearing, which is characterized in that be equipped in the middle part of the outline border The straight slot of the outline border is radially penetrated through along the outline border, the vibration inside casing receiving is set in the straight slot；

Preferably, the outline border includes the first mounting hole and the second mounting hole, first mounting hole and second mounting hole It is divided on the top and bottom of the outline border, first mounting hole is along the outline border axially through the outline border；It is described Second mounting hole is along the outline border axially through the outline border；

Preferably, the Micromass cell culture device based on bearing further includes shaft member, and the shaft member is sheathed on the elasticity On pivot, the bearing holder (housing, cover) is set in the shaft member.

3. the Micromass cell culture device according to claim 2 based on bearing, which is characterized in that described based on the micro- of bearing Thrust-measuring device further includes upper pin axial sleeve and lower pin axial sleeve, and the upper pin axial sleeve is installed in first mounting hole, described Upper pin axial sleeve clamps the first end of the resilient pivot；The lower pin axial sleeve is installed in second mounting hole, the lower pivot Axle sleeve clamps the second end of the resilient pivot.

4. the Micromass cell culture device according to claim 3 based on bearing, which is characterized in that the lower pin axial sleeve includes First time pin axial sleeve and second time pin axial sleeve, first time pin axial sleeve and second time pin axial sleeve are along second mounting hole The second end of resilient pivot described in radial obvolvent.

5. the Micromass cell culture device according to claim 2 based on bearing, which is characterized in that the shaft member includes the One shaft member and second shaft section, the first axle component are sheathed in the first end of the resilient pivot；The second shaft portion Part is sheathed in the second end of the resilient pivot.

6. the Micromass cell culture device according to claim 1 based on bearing, which is characterized in that described based on the micro- of bearing Thrust-measuring device further includes bearing locating piece, and the bearing locating piece includes clamping ring and fixed convex block；The fixed convex block It is set on the outer wall of the clamping ring；The inner wall of the clamping ring clamps the bearing, the fixed convex block and the outline border It is fixedly connected.

7. the Micromass cell culture device according to claim 6 based on bearing, which is characterized in that the bearing locating piece packet Include upper bearing (metal) locating piece and lower bearing locating piece；The upper bearing (metal) locating piece clamps the bearing in the resilient pivot first end, And it is fixedly connected with the outline border；The lower bearing locating piece clamps the bearing in the resilient pivot second end, and with it is described Outline border is fixedly connected, and bearing is fixed by bearing locating piece with outline border, and weight is born to effectively share crossbeam by bearing Amount.

8. the Micromass cell culture device according to any one of claims 1 to 7 based on bearing, which is characterized in that described Bearing is thrust bearing and/or radial bearing.

9. the Micromass cell culture device according to claim 1 based on bearing, which is characterized in that the of the resilient pivot Radial bearing is arranged on one end；It is arranged thrust bearing and radial bearing in the second end of the resilient pivot.

10. the Micromass cell culture device according to claim 9 based on bearing, which is characterized in that described based on bearing Micromass cell culture device further includes counterweight, thruster mounting disc, obliquity sensor, multiple actuators and pedestal, the counterweight and The thruster mounting disc is respectively arranged on the glove end；The outline border is installed on the pedestal；The inclination angle sensing Device is installed on the pedestal, and measures the rotational angle of the pedestal；The actuator is divided on the outside of the glove end, and It is fixed on the pedestal.