CN219265699U - Test device for testing FAST reflecting surface unit 1# connecting mechanism - Google Patents
Test device for testing FAST reflecting surface unit 1# connecting mechanism Download PDFInfo
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- CN219265699U CN219265699U CN202223350566.6U CN202223350566U CN219265699U CN 219265699 U CN219265699 U CN 219265699U CN 202223350566 U CN202223350566 U CN 202223350566U CN 219265699 U CN219265699 U CN 219265699U
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Abstract
The utility model relates to a test device for testing a FAST reflecting surface unit 1# connecting mechanism, which comprises: the device comprises a rotating frame supporting table, a fixed hinge support, a hinge shaft, a rotating frame, weights, weight trays, a No. 1 node shaft test piece, a positive pressure measuring device, a servo sliding table and the like; the device applies positive pressure to an inner ring hole of a joint bearing arranged in a bearing seat of a 1# connecting mechanism through a fixed hinge, a rotating frame, weights and a 1# connecting mechanism test piece shaft, and simulates a FAST reflecting surface unit to apply positive pressure to the 1# connecting mechanism through gravity. The temperature sensor is used for measuring the temperature of the linear sliding bearing, the force sensor connected between the screw nut and the sliding table is used for measuring the friction force, the reciprocating linear motion of the 1# connecting mechanism is simulated through the reciprocating linear motion of the servo sliding table, so that the friction coefficient mu of the linear sliding bearing can be measured, and the service life of the 1# connecting mechanism linear sliding bearing is tested through the reciprocating motion times of the servo sliding table.
Description
Technical Field
The utility model relates to the technical field of radio astronomical telescopes, in particular to a test device for testing a 1# connecting mechanism of a FAST reflecting surface unit, and particularly relates to a test device for testing the friction coefficient and the abrasion life of the 1# connecting mechanism of the FAST reflecting surface unit.
Background
500 m caliber spherical radio telescope (Five-handred-meter Aperture Spherical radio Telescope, FAST) is the largest single caliber radio astronomical telescope worldwide, with three independent innovations: using natural karst pits in Guizhou as addresses; actively deforming the reflective surface; the flexible light mechanism dragged by six cables in parallel drags the feed cabin to realize primary cable driving, and the AB rotating shaft mechanism and the Stewart parallel mechanism in the feed cabin realize secondary fine adjustment of the feed pose and realize high-precision positioning of the feed source.
The FAST reflecting surface can realize instantaneous 300-meter caliber active deformation, a paraboloid is formed by spherical deformation, the paraboloid is ensured to always point to a celestial body to be observed, and radio wave signals from the celestial body are focused. At the same time, the feed receiver at the focal position receives and processes the radio wave signal, and the process is continuous.
The FAST reflecting surface is composed of a peripheral supporting structure (ring beam lattice column), a cable net, a reflecting surface unit, a hydraulic actuator and the like. The ring beam is a space net frame ring beam structure with the inner diameter exceeding 500 meters, the width being about 11 meters and the height being about 5 meters, 50 lattice columns are used as supports of the ring beam, 150 lug plates are welded on ball nodes on the bottom surface of an inner ring of the ring beam, the lug plates are connected with 150 edge main ropes of a rope net, and the rope net structure supports and constrains 4450 reflecting surface units. Wherein triangular units 4300 are used and quadrilateral units 150 are used at the edge of the cable net.
The reflecting surface unit is composed of a bolt net frame and an aluminum alloy panel, the bolt net frame is arranged at the lower part, the aluminum alloy panel is arranged at the upper part of the bolt net frame, and the bolt net frame and the aluminum alloy panel are connected together through a connecting piece in the middle. And the corner points of the upper chord members of the bolt net frame are fixedly connected with the node shaft ball nodes of the 1# connecting structure through bolts of the rod pieces. The corner points of each reflecting surface unit are different in connecting mechanisms, and the corner points are respectively provided with a 0# connecting mechanism, a 1# connecting mechanism and a 2# connecting mechanism. Wherein the 0# and 1# connecting mechanisms comprise bearing blocks, knuckle bearings and large parts of the node shaft 3; the 2# connecting mechanism comprises a node shaft, a ball hinge seat, a ball hinge and a PTFE slider 4 big component fixedly connected on the ball pin. The 0# connecting mechanism restrains 3 translational degrees of freedom, the 1# connecting mechanism restrains 2 translational degrees of freedom, and the 2# connecting mechanism restrains 1 translational degree of freedom. The 3 sets (3 sets of triangle units) or 4 sets (4 sets of quadrilateral units) of each reflecting surface unit are arranged on the node disc of the cable net, the bearing seat of the 0# connecting mechanism and the 1# connecting mechanism are fixedly connected with the node disc supporting the same through bolts, and the PTFE sliding block of the 2# connecting mechanism can translate at will on the node disc supporting the same. Six degrees of freedom of the rigid reflecting surface unit are restrained by the restraining connection mode, so that the reflecting surface unit is connected with the cable net structure in a simple supporting restraining mode, and additional internal force cannot be caused by movement deformation of the cable net structure.
A linear sliding bearing is formed between the node shaft of the 1# connecting mechanism and the inner ring of the joint bearing arranged in the bearing seat, when the FAST reflecting surface actively deforms, the relative positions of adjacent node discs can continuously change due to the active deformation of the cable net, and the linear sliding bearing can reciprocate along the axis of the node shaft so as to adapt to the change of the relative positions of the node discs of the cable net.
In the long-term running process of the FAST, 3 kinds of connecting mechanisms of the reflecting surface unit sometimes have faults, including deformation and fracture of connecting bolts of a connecting mechanism bearing seat and a node disc, and deformation and fracture of rods and bolts connected with a connecting mechanism ball joint. Some of these failures are related to the magnitude of the coefficient of friction μ of the 1# linkage linear slide bearing and the wear life. Therefore, the friction coefficient mu and the wear life of the linear sliding bearing of the FAST reflecting surface unit 1# connecting mechanism are further tested, the change rules of the friction coefficient mu and the wear life are studied, and the defect of the existing 1# connecting mechanism is found to be necessary for improving the 1# connecting mechanism. It is necessary to design and manufacture a set of test equipment for testing the friction coefficient and wear life of the FAST reflector unit # 1 connection mechanism.
The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The utility model aims to provide a test device for testing a FAST reflecting surface unit 1# connecting mechanism, so as to solve the technical problems in the prior art.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the utility model provides a test device for testing a FAST reflecting surface unit 1# connecting mechanism, which comprises: the device comprises a rotating frame supporting table, a fixed hinge support, a hinge shaft, a rotating frame, weights, weight trays, a No. 1 node shaft test piece, a positive pressure measuring device, a servo sliding table and a servo sliding table supporting table; the rotating frame supporting table is provided with a fixed hinge support; the rotating frame is connected with the fixed hinge support through a hinge shaft; the node shaft connecting rod of the No. 1 node shaft test piece is fixedly connected with the lower chord member of the rotating frame; the bearing seat test piece of the No. 1 node shaft test piece is arranged on a servo sliding table, and the servo sliding table is arranged on a servo sliding table supporting table; the weight tray is hoisted on the rotating frame, and weights are arranged on the weight tray; the positive pressure measuring device is arranged on the servo slipway supporting table and is positioned above the bearing seat test piece.
Preferably, a conical nest is arranged on the node shaft connecting rod of the 1# node shaft test piece, the 1# node shaft test piece is fixedly connected with the lower chord member hole of the rotating support through a conical end set screw, and the conical end set screw 11 is tightly propped against the conical nest of the node shaft connecting rod.
Preferably, the positive pressure measurement device includes: the device comprises a hanging strip, a hanging ring screw, a force sensor connecting block, a bracket, a bolt and a nut; the beam of the support is hung with a force sensor connecting block through a bolt and a nut, the force sensor is connected with the force sensor connecting block through threads, the lifting screw is connected with a threaded hole at the lower part of the force sensor through threads, the lifting screw is connected with a hanging belt, and the hanging belt hangs the journal of the 1# node shaft test piece at the hanging position of the lower 1# node shaft.
Preferably, the servo slipway comprises a servo slipway seat, a linear rolling guide rail pair, a workbench, a ball screw pair, a synchronous pulley, a synchronous belt, a motor bracket, a servo motor, an inner hexagon screw, a force sensor connecting gasket, a force sensor and a screw nut; the guide rail of the linear rolling guide rail pair is arranged on a servo slide seat, the workbench is arranged on a sliding block of the linear rolling guide rail pair, the workbench slides along the guide rail of the linear rolling guide rail pair, the ball screw pair is arranged on the servo slide seat, a screw rod of the ball screw pair is supported at two ends through bearing seats, a screw rod power input end is provided with a synchronous pulley, the servo slide seat is provided with a motor bracket for supporting a servo motor, a synchronous pulley is arranged on a shaft of the servo motor 32, the ball screw pair and the synchronous pulley of the servo motor are connected through a synchronous belt, the servo motor drives the ball screw of the ball screw pair to rotate through the synchronous belt, the ball screw drives a screw rod to do linear motion, the screw rod is connected with the workbench through a force sensor, a driving force F for driving the workbench to do linear motion is transmitted, and meanwhile the driving force F is measured.
Preferably, the screw nut is fixedly connected with the screw nut through a screw, the force sensor is fixedly connected with the screw nut through a force sensor connecting washer and an inner hexagon screw, the workbench is fixedly connected with the force sensor connecting base through a bolt, and the force sensor is fixedly connected with the workbench and the force sensor connecting base through the force sensor connecting washer and the inner hexagon screw.
Preferably, a left travel switch and a right travel switch are arranged on the servo sliding table, the brackets of the left travel switch and the right travel switch are fixedly connected with the servo sliding table base through screws, and the workbench reciprocates between the left travel switch and the right travel switch in a linear mode.
Preferably, the weight tray includes: the tray, the connecting suspender and the tray lifting lug are welded in sequence.
Preferably, the weight tray is hung by the lifting lug of the tray at the lower part of the rotating frame through a pin shaft screw and a nut, weights are placed on the weight tray, and the positive pressure applied to the bearing seat test piece by the rotating frame is regulated through the weight of the placed weights.
Preferably, the servo slipway is fixedly connected to the servo slipway supporting table through bolts, the bearing seat test piece is fixedly connected to the workbench of the servo slipway through 2 plain washers, 2 spring washers and 2 hexagon socket head cap screws, and the hexagon socket head cap screws penetrate through 2 bolt holes of the 1# bearing seat of the 1# node shaft test piece.
Preferably, the 1# connection mechanism test piece includes: the device comprises a 1# node shaft test piece, a bearing seat test piece, a gasket and a bolt; the 1# node shaft test piece includes: the device comprises a 1# node shaft and a node shaft connecting rod, wherein the 1# node shaft is connected with the node shaft connecting rod, a conical nest is processed on the node shaft connecting rod, and a 1# node shaft test piece is fixedly connected with a rotating frame; the bearing seat test piece comprises: the novel high-temperature-resistant bearing comprises a 1# bearing seat, a joint bearing and a PTFE fabric pad, wherein the PTFE fabric pad is arranged on an inner ring of the joint bearing, a steel-PTFE friction pair is formed by a 1# node shaft and the inner ring of the joint bearing, a washer and a bolt are arranged at the end part of the 1# node shaft, and the bolt is connected with a temperature sensor.
By adopting the technical scheme, the utility model has the following beneficial effects:
the utility model simulates the connection mode and the positive pressure bearing mode of the FAST reflecting panel unit and the 1# connecting mechanism, and the problems in design and use of the 1# connecting mechanism are found through experiments, so that the friction coefficient and the abrasion of the linear sliding bearing of the 1# connecting mechanism of the FAST reflecting panel unit are tested.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following description will briefly explain the drawings needed in the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a test device for testing friction coefficient and wear life of a FAST reflecting surface unit 1# connecting mechanism;
FIG. 2 is a schematic diagram of a servo slipway of a test device for testing friction coefficient and wear life of a FAST reflector unit 1# connection mechanism
FIG. 3 is a schematic diagram of positive pressure measurement of a test device for testing friction coefficient and wear life of a 1# connection mechanism of a FAST reflecting surface unit;
FIG. 4 is a schematic diagram of a positive pressure measuring device of a test device for testing friction coefficient and wear life of a 1# connection mechanism of a FAST reflecting surface unit;
FIG. 5 is a schematic diagram of a turret of a test apparatus for testing the friction coefficient and wear life of a FAST reflector unit 1# connection mechanism provided by the present utility model;
FIG. 6 is a schematic diagram of a weight tray of a test device for testing the friction coefficient and the wear life of a 1# connection mechanism of a FAST reflecting surface unit;
FIG. 7 is a schematic diagram of a test piece of the 1# connecting mechanism provided by the utility model;
fig. 8 is a partial cross-sectional view of fig. 7.
Icon: 1-a rotating frame supporting table; 2-a screw; 3-a fixed hinge support; 4-a hinge axis; 5-cotter pin; 6, a rotating frame; 7, a pin shaft screw; 8-a nut; 9-weight; 10-weight tray; 11-taper end set screw; 12-1 # node shaft test piece; 13-a bearing seat test piece; 14-a temperature sensor; 15-positive pressure measuring means; 16-a servo slipway; 17-a bolt; 18-a servo slipway support; 19-plain washer; 20-a spring washer; 21-socket head cap screws; 22-a linear rolling guide rail pair; 23-left travel switch; 24-a workbench; 25-connecting the workbench with the force sensor; 26-right travel switch; 27-a servo slipway base; 28-ball screw pair; 29-synchronous pulley; 30-a synchronous belt; 31-a motor bracket; 32-a servo motor; 33-socket head cap screws; 34—force sensor connection gasket; 35-force sensor; 36-a screw nut; 37-connecting the screw nut with the force sensor; a-unidirectional sliding distance of the workbench; the hanging part of the 38-1 # node shaft; 39-hanging strip; 40-a lifting ring screw; 41-force sensor; 42-force sensor connection block; 43-a bracket; 44-bolts; 45-nut; 46-hinge bearing sleeve; 47-left diagonal bar; 48-upper chord; 49-web members; 50-right diagonal bar; 51—a set screw seat; 52-weight lifting lugs; 53-bottom chord; 54-a tray; 55-connecting a boom; 56-a tray lifting lug; 57-1 # node axis; 58-node shaft connecting rod; 59-tightly fixing the conical nest; 60-knuckle bearing; 61-PTFE fabric mat; 62-a gasket; 63—set screw; 64-1 # bearing seat.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.
Referring to fig. 1 to 8, the present embodiment provides a test apparatus for testing a FAST reflection surface unit 1# connection mechanism, which includes: the device comprises a rotating frame supporting table 1, a fixed hinge support 3, a hinge shaft 4, a rotating frame 6, weights 9, weight trays 10, a No. 1 node shaft test piece 12, a positive pressure measuring device 15, a servo sliding table 16 and a servo sliding table supporting table 18; the rotating frame supporting table 1 is provided with a fixed hinge support 3; the rotating frame 6 is connected with the fixed hinge support 3 through a hinge shaft 4; the node shaft connecting rod 58 of the No. 1 node shaft test piece 12 is fixedly connected with the lower chord of the rotating frame 6; the bearing seat test piece 13 of the No. 1 node shaft test piece 12 is arranged on a servo sliding table 16, and the servo sliding table 16 is arranged on a servo sliding table supporting table 18; the weight tray 10 is hoisted on the rotating frame 6, and weights 9 are arranged on the weight tray 10; the positive pressure measuring device 15 is installed on the servo slipway supporting table 18 and is positioned above the bearing seat test piece 13.
In this embodiment, the turret support table 1 and the servo slide table support table 18 are preferably the supports of the whole set of test equipment, and are fixedly connected to the ground, so as to preserve a fixed positional and height relationship. The fixed hinge support 3 is fixedly connected to the rotating frame supporting table 1 through bolts, the rotating frame 6 is connected with the fixed hinge support 3 through the hinge shaft 4 to form a fixed rotating pair, and the rotating frame 6 can rotate around the center of the hinge shaft 4.
In this embodiment, preferably, the node shaft connecting rod 58 of the 1# node shaft test piece 12 is provided with a conical nest 59, the 1# node shaft test piece 12 is fastened and connected with the lower chord hole of the rotating bracket 6 by a conical end fastening screw 11, and the conical end fastening screw 11 is tightly pressed against the conical nest 59 of the node shaft connecting rod 58 to play a limiting role on the axial direction and the rotation direction around the axial direction of the 1# node shaft test piece 12, so that the 1# node shaft test piece 12 is fixedly connected with the rotating bracket 6, and the working condition that the FAST reflecting surface unit is fixedly connected with the 1# node shaft 57 is completely simulated.
In this embodiment, preferably, the positive pressure measuring device 15 is fixedly connected to the servo slipway supporting table 18 through a bolt 17, and is located near the bearing seat test piece 13, and is used for measuring the positive pressure applied to the bearing seat test piece 13 by the rotating frame. The weight tray 10 is hung on the lower tray lifting lug 52 of the rotating frame 6 through the pin shaft screw 7 and the nut 8, the weight 9 is placed on the weight tray 10, and the positive pressure applied to the bearing seat test piece 13 by the rotating frame is regulated according to the weight of the placed weight 9.
In this embodiment, preferably, the positive pressure measurement device 15 includes: a sling 39, eye screws 40, force sensors 41, force sensor connection blocks 42, brackets 43, bolts 44, and nuts 45; the beam of the bracket 43 is hung with a force sensor connecting block 42 through a bolt 44 and a nut 45, the force sensor 41 is connected with the force sensor connecting block 42 through threads, the eye screw 40 is connected with a threaded hole at the lower part of the force sensor 41 through threads, the eye screw 40 is connected with a hanging strip 39, and the hanging strip 39 hangs the journal of a 1# node shaft 57 of the 1# node shaft test piece 12 at a lower 1# node shaft hanging part 38. When the positive pressure is measured, the flat washer 19, the spring washer 20 and the inner hexagon screw 21 which are fixedly connected with the workbench 24 are detached from the bearing seat test piece 13, the bearing seat test piece 13 is separated from the workbench 24, when the positive pressure value is adjusted, the positive pressure measuring device 15 is integrally detached, the flat washer 19, the spring washer 20 and the inner hexagon screw 21 are installed, and the bearing seat test piece 13 is fixedly connected with the workbench 24 again.
In this embodiment, preferably, the servo slipway 16 is composed of a servo slipway seat 27, a linear rolling guide rail pair 22, a left travel switch 23, a workbench 24, a workbench and force sensor connecting seat 25, a right travel switch 26, a ball screw pair 28, a synchronous pulley 29, a synchronous belt 30, a motor bracket 31, a servo motor 32, an inner hexagon screw 33, a force sensor connecting washer 34, a force sensor 35, a screw nut 36, a screw nut and force sensor connecting seat 37; a is the sliding distance of the single stroke of the table 24, which is equal to the linear sliding working distance of the 1# node shaft test piece 12 of the 1# connecting mechanism with respect to the bearing block test piece 13. The guide rail of the linear rolling guide rail pair 22 is arranged on a servo slide seat 27, the workbench 24 is arranged on a slide block of the linear rolling guide rail pair 22, the workbench 24 slides along the guide rail of the linear rolling guide rail pair 22, the ball screw pair 28 is arranged on the servo slide seat 27, a screw of the ball screw pair 28 is supported at two ends by bearing seats, a screw power input end is provided with the synchronous pulley 29, the servo slide seat 27 is provided with a motor bracket 31 for supporting a servo motor 32, a synchronous pulley 29 is arranged on a shaft of the servo motor 32, the ball screw pair 28 and the synchronous pulley 29 of the servo motor 32 are connected by a synchronous belt 30, the servo motor 32 drives a ball screw of the ball screw pair 28 to rotate by the synchronous belt 30, the ball screw drives a screw nut 36 to do linear motion, the screw nut 36 is connected with the workbench 24 by a sensor 35, and the driving force F for driving the workbench 24 is transmitted and measured at the same time. (f=f f +friction force of linear rolling guide rail pair. Because the friction coefficient of the linear rolling guide rail pair is about 0.002-0.003,1 # connecting mechanism linear sliding bearing steel-PTFE friction pair theoretical friction coefficient is 0.05,the difference is more than 16 times, and the friction force of the linear rolling guide rail pair is negligible. So consider f=f f . The friction force of the linear rolling guide rail pair 22 can also be measured by adding a weight with the magnitude of the normal stress Fn to the workbench 24 under the working condition that the workbench 24 is not provided with the bearing seat test piece 13. )
In this embodiment, preferably, the screw nut and the force sensor connecting seat 37 are fixedly connected with the screw nut 36 through screws, the force sensor 35 is fixedly connected with the screw nut and the force sensor connecting seat 37 through the force sensor connecting washer 34 and the socket head cap screw 33, the workbench and the force sensor connecting seat 25 are fixedly connected with the workbench 24 through bolts, and the force sensor 35 is fixedly connected with the workbench and the force sensor connecting seat 25 through the force sensor connecting washer 34 and the socket head cap screw 33.
In this embodiment, it is preferable that the left and right travel switches 23 and 26 are mounted on the servo slide table 16, and the brackets of the left and right travel switches 23 and 26 are fixedly connected to the servo slide table base 27 by screws, so that the table 24 reciprocates linearly between the left and right travel switches 23 and 26. Preferably, the servo slipway 16 is provided with a temperature sensor 14 for measuring the temperature of the linear sliding bearing.
In this embodiment, preferably, the weight tray 10 includes: a pallet 54, a connecting boom 55 and a pallet lifting lug 56, which are welded in sequence.
In this embodiment, preferably, the weight tray 10 is hung on the lower tray lifting lug 52 of the rotating frame 6 through the pin shaft screw 7 and the nut 8, the weight 9 is placed on the weight tray 10, and the positive pressure applied to the bearing seat test piece 13 by the rotating frame 6 is regulated through the weight of the placed weight 9.
In this embodiment, preferably, the servo slipway 16 is fixedly connected to the servo slipway supporting table 18 through bolts, the bearing seat test piece 13 is fixedly connected to the workbench 24 of the servo slipway 16 through 2 flat washers 19, 2 spring washers 20 and 2 socket head cap screws 21, and the socket head cap screws 21 pass through 2 bolt holes of the 1# bearing seat 64 of the 1# node shaft test piece 12.
In this embodiment, preferably, the 1# connection mechanism test piece includes: a node 1 shaft test piece 12, a bearing seat test piece 13, a washer 62 and a bolt 63; the 1# node shaft test piece 12 includes: the 1# node shaft 57 is connected with the node shaft connecting rod 58, and a conical nest 59 is processed on the node shaft connecting rod 58 and is used for fixedly connecting the 1# node shaft test piece 12 with the rotating frame 6; the bearing housing test piece 13 includes: the joint bearing comprises a 1# bearing seat 64, a joint bearing 60 and a PTFE fabric pad 61, wherein the PTFE fabric pad 61 is arranged on the inner ring of the joint bearing 60, the 1# joint shaft 57 and the inner ring of the joint bearing 60 form a steel-PTFE friction pair, a gasket 62 and a bolt 63 are arranged at the end part of the 1# joint shaft 57, and the bolt 63 is connected with the temperature sensor 14.
The test device is provided with a motion control device of the servo slipway.
The test device is provided with a test data output device which has the functions of data acquisition, display and recording, and has at least 5 data channels, and the recorded data are as follows:
as shown in connection with fig. 4:
coefficient of friction-mu;
friction force-F f；
Positive pressure-F n；
Bearing support reaction force-F N ；
F n = F N 1500N (Positive pressure bearing the 1# node shaft)
μ = F f /F n
Positive pressure F n Adjustment and measurement of (2) ；
F N = (L 2 * G 2 + L 3 *G 1 )/ L 1 =1500N
F N ＇ = (L 2 * G 2 + L 3 *G 1 )/（L 1 -a）
F N ＇ Positive pressure applied to the bearing seat 13 at the left travel switch;
ΔF N ——F N size relative difference in single stroke a；
ΔF N = （F N - F N ＇ ）/ F N ;
G 1 The dead weight of the test piece 12 of the 1# node shaft is added to the rotating frame 6;
G 2 the weight 9 is added with the weight of the weight tray 10;
L 1 design determination, assurance of Δf N No more than 5%;
L 2 -design determination;
L 3 -determined by the turret 6 plus the center of gravity of the node 1 shaft test piece 12;
in summary, the utility model provides a test device for testing friction coefficient and abrasion life of a 1# connecting mechanism of a FAST reflecting surface unit, which consists of a rotating bracket supporting table, a fixed hinge, a rotating bracket, weights, a 1# connecting mechanism test piece, a servo sliding table, a positive pressure measuring device, a temperature sensor, a force sensor, a servo sliding table supporting table and the like. The device applies positive pressure to an inner ring hole of a joint bearing arranged in a bearing seat of a 1# connecting mechanism through a fixed hinge, a rotating frame, weights and a 1# connecting mechanism test piece shaft, and simulates a FAST reflecting surface unit to apply positive pressure to the 1# connecting mechanism through gravity. The temperature sensor is used for measuring the temperature of the linear sliding bearing, the force sensor connected between the screw nut and the sliding table is used for measuring the friction force, the reciprocating linear motion of the 1# connecting mechanism is simulated through the reciprocating linear motion of the servo sliding table, so that the friction coefficient mu of the linear sliding bearing can be measured, and the service life of the 1# connecting mechanism linear sliding bearing is tested through the reciprocating motion times of the servo sliding table.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (10)
1. A test apparatus for testing a FAST reflector unit # 1 connection mechanism, comprising: the device comprises a rotating frame supporting table, a fixed hinge support, a hinge shaft, a rotating frame, weights, weight trays, a No. 1 node shaft test piece, a positive pressure measuring device, a servo sliding table and a servo sliding table supporting table; the rotating frame supporting table is provided with a fixed hinge support; the rotating frame is connected with the fixed hinge support through a hinge shaft; the node shaft connecting rod of the No. 1 node shaft test piece is fixedly connected with the lower chord member of the rotating frame; the bearing seat test piece of the No. 1 node shaft test piece is arranged on a servo sliding table, and the servo sliding table is arranged on a servo sliding table supporting table; the weight tray is hoisted on the rotating frame, and weights are arranged on the weight tray; the positive pressure measuring device is arranged on the servo slipway supporting table and is positioned above the bearing seat test piece.
2. The test device according to claim 1, wherein a conical nest is arranged on the node shaft connecting rod of the 1# node shaft test piece, the 1# node shaft test piece is fixedly connected with the lower chord hole of the rotating frame through a conical end set screw, and the conical end set screw is tightly pressed in the conical nest of the node shaft connecting rod.
3. The test device of claim 1, wherein the positive pressure measurement device comprises: the device comprises a hanging strip, a hanging ring screw, a force sensor connecting block, a bracket, a bolt and a nut; the beam of the support is hung with a force sensor connecting block through a bolt and a nut, the force sensor is connected with the force sensor connecting block through threads, the lifting screw is connected with a threaded hole at the lower part of the force sensor through threads, the lifting screw is connected with a hanging belt, and the hanging belt hangs the journal of the 1# node shaft test piece at the hanging position of the lower 1# node shaft.
4. The test device according to claim 1, wherein the servo slipway is composed of a servo slipway seat, a linear rolling guide rail pair, a workbench, a ball screw pair, a synchronous pulley, a synchronous belt, a motor bracket, a servo motor, an inner hexagonal screw, a force sensor connecting washer, a force sensor and a screw nut; the guide rail of the linear rolling guide rail pair is arranged on a servo slide seat, the workbench is arranged on a sliding block of the linear rolling guide rail pair, the workbench slides along the guide rail of the linear rolling guide rail pair, the ball screw pair is arranged on the servo slide seat, a screw rod of the ball screw pair is supported at two ends through bearing seats, a screw rod power input end is provided with a synchronous pulley, the servo slide seat is provided with a motor bracket for supporting a servo motor, a synchronous pulley is arranged on a shaft of the servo motor, the ball screw pair and the synchronous pulley of the servo motor are connected through a synchronous belt, the servo motor drives the ball screw of the ball screw pair to rotate through the synchronous belt, a ball screw driving screw nut is in linear motion, the screw nut is connected with the workbench through a force sensor, a driving force F for driving the workbench to do linear motion is transmitted, and meanwhile the driving force F is measured.
5. The test device of claim 1, wherein the lead screw nut is fixedly connected with the lead screw nut through a screw, the force sensor is fixedly connected with the lead screw nut and the force sensor connecting seat through a force sensor connecting washer and an inner hexagon screw, the workbench is fixedly connected with the force sensor connecting seat through a bolt, and the force sensor is fixedly connected with the workbench and the force sensor connecting seat through the force sensor connecting washer and the inner hexagon screw.
6. The test device according to claim 1, wherein a left travel switch and a right travel switch are mounted on the servo slipway, the brackets of the left travel switch and the right travel switch are fixedly connected with the servo slipway seat through screws, and the workbench reciprocates linearly between the left travel switch and the right travel switch.
7. The test device of claim 1, wherein the weight tray comprises: the tray, the connecting suspender and the tray lifting lug are welded in sequence.
8. The test device according to claim 1, wherein the lower tray lifting lugs of the rotating frame hang weight trays through pin screws and nuts, weights are placed on the weight trays, and positive pressure applied to the bearing seat test piece by the rotating frame is regulated through the weight of the placed weights.
9. The test device according to claim 1, wherein the servo slipway is fixedly connected to the servo slipway supporting table through bolts, the bearing seat test piece is fixedly connected to a workbench of the servo slipway through 2 plain washers, 2 spring washers and 2 socket head cap screws, and the socket head cap screws penetrate through 2 bolt holes of a 1# bearing seat of the 1# node shaft test piece.
10. The test device of claim 1, wherein the # 1 connection mechanism test piece comprises: the device comprises a 1# node shaft test piece, a bearing seat test piece, a gasket and a bolt;
the 1# node shaft test piece includes: the device comprises a 1# node shaft and a node shaft connecting rod, wherein the 1# node shaft is connected with the node shaft connecting rod, a conical nest is processed on the node shaft connecting rod, and a 1# node shaft test piece is fixedly connected with a rotating frame;
the bearing seat test piece comprises: the novel high-temperature-resistant bearing comprises a 1# bearing seat, a joint bearing and a PTFE fabric pad, wherein the PTFE fabric pad is arranged on an inner ring of the joint bearing, a steel-PTFE friction pair is formed by a 1# node shaft and the inner ring of the joint bearing, a washer and a bolt are arranged at the end part of the 1# node shaft, and the bolt is connected with a temperature sensor.
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| CN202223350566.6U CN219265699U (en) | 2022-12-14 | 2022-12-14 | Test device for testing FAST reflecting surface unit 1# connecting mechanism |
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| CN202223350566.6U CN219265699U (en) | 2022-12-14 | 2022-12-14 | Test device for testing FAST reflecting surface unit 1# connecting mechanism |
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