CN210982270U

CN210982270U - Automatic sample changing device and neutron reflection experimental device

Info

Publication number: CN210982270U
Application number: CN201921766408.4U
Authority: CN
Inventors: 肖松文; 朱涛; 李树发; 孙远
Original assignee: Institute of High Energy Physics of CAS; Institute of Physics of CAS; Spallation Neutron Source Science Center
Current assignee: Institute of High Energy Physics of CAS; Institute of Physics of CAS; Spallation Neutron Source Science Center
Priority date: 2019-10-21
Filing date: 2019-10-21
Publication date: 2020-07-10
Anticipated expiration: 2029-10-21

Abstract

The utility model discloses an automatic trade appearance device and neutron reflection experimental apparatus, this automatic trade appearance device include support frame, sample supporting mechanism, actuating mechanism and location feedback mechanism. The sample supporting mechanism is rotatably connected to the supporting frame, a plurality of samples are arranged on the sample supporting mechanism along the circumferential direction of the sample supporting mechanism, the driving mechanism is arranged between the sample supporting mechanism and the supporting frame and can drive the sample supporting mechanism to rotate, the positioning feedback mechanism is arranged on the sample supporting mechanism, and the positioning feedback mechanism can read the rotation stroke of the sample supporting mechanism. The driving mechanism and the positioning feedback mechanism can be matched with each other to enable the samples to complete neutron reflection experiments in sequence, all the samples are installed on the sample supporting mechanism before the experiments are started, and the automatic sample changing device can complete the neutron reflection experiments of all the samples. The method saves precious beam time, reduces the stay time of personnel entering a radiation area, reduces the damage of experimental radiation to the personnel, and improves the experimental efficiency.

Description

Automatic sample changing device and neutron reflection experimental device

Technical Field

The utility model relates to a neutron scattering technology field especially relates to an automatic trade appearance device and neutron reflection experimental apparatus.

Background

The neutron reflection spectrometer is generally provided with an electromagnet for providing a variable magnetic field environment of 0-1 Tesla, the magnetic field uniformity in a phi 20 × 20mm area of the center of the electromagnet is required to be better than 2%, a gap between poles of the electromagnet is generally only about 50-100 mm, in a normal-temperature neutron reflection experiment, a film sample is generally fixedly arranged on a nonmagnetic bracket at the center of the electromagnet, the time of a normal-temperature neutron reflection experiment is generally from several hours to tens of hours, the neutron spectrometer needs to be closed first when different samples need to be replaced, a beam current shielding door of the experiment personnel is opened and enters a sample room for replacing a beam current shielding door, the sample shielding door of the sample is opened, the sample shielding door of the neutron shielding spectrometer is closed, and the neutron shielding door of the experiment personnel is closed.

It is highly desirable to design a device capable of loading multiple samples and changing samples remotely and automatically to save the time of expensive neutron beam and minimize the retention time of experimenters entering the irradiation area.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an automatic device of changing a design can rotate all samples to the experimental position in proper order automatically, practices thrift the valuable beam time in the experimentation, reduces the experimenter and gets into the time that the radiation region stops, reduces the damage of radiation to the experimenter in the experimentation, improves experimental efficiency and sample position precision.

Another object of the utility model is to provide a neutron reflection experimental apparatus can carry out the neutron reflection experiment in proper order to all samples in the device automatically, has saved the valuable beam time in the experimentation, reduces the experimenter and gets into the time that the radiation region stops, reduces the damage of radiation to the experimenter in the experimentation, improves experimental efficiency and experimental result accuracy.

For realizing the technical effect, the utility model discloses an automatic device of changing a design's technical scheme as follows:

an automatic sample changing device, comprising: a support frame; the sample supporting mechanism is rotatably connected to the supporting frame and is provided with a plurality of samples along the circumferential direction; the driving mechanism is arranged between the sample supporting mechanism and the supporting frame and can drive the sample supporting mechanism to rotate; and the positioning feedback mechanism is arranged on the sample supporting mechanism and can read the rotation stroke of the sample supporting mechanism.

In some embodiments, the positioning feedback mechanism comprises: the grating is connected to the sample supporting mechanism; the grating reading piece is arranged on the supporting frame and can read the rotation angle of the grating.

In some embodiments, the sample support mechanism comprises: the supporting piece is rotatably connected to the supporting frame at one end; a plurality of air pipes; the manifold block is arranged on the upper surface of the support piece, one side of the manifold block is connected with the plurality of air pipes in a sealing mode, and the other side of the manifold block is connected with a vacuum pump; the sample holder, the sample holder is a plurality of, every the sample holder is equipped with the second through-hole, every the sample holder with the manifold block passes through one the trachea is sealed to be connected, the sample holder passes through the second through-hole adsorbs the sample.

In some embodiments, the support member has a plurality of spaced-apart engagement grooves on a peripheral surface thereof, and the sample holder is connected to the engagement grooves via a mounting seat.

In some embodiments, the sample support mechanism further comprises: one end of the first joint is hermetically connected with the manifold block, and the other end of the first joint is hermetically connected with a vacuum pump; a plurality of second joints, wherein the manifold block is hermetically connected with the plurality of air pipes through a plurality of second joints; and a plurality of third joints, wherein each sample holder is connected with one air pipe in a sealing way through one third joint.

In some embodiments, the support member comprises: the rotating shaft part, one end of the said rotating shaft part cooperates on the said supporting arm rotatably; and the rotary disc is connected with the other end of the rotating shaft part.

In some embodiments, each sample holder and the adsorption surface of the sample are vertical planes, and the distances between the adsorption surfaces of the sample holders and the rotating shaft of the support member are equal.

In some embodiments, the drive mechanism comprises: the driving piece is connected with the supporting frame; a first rotating member connected to the sample support mechanism, the first rotating member being configured to rotate under the drive of the driving member; the transmission piece is connected with the first rotating piece; the second rotating part is connected with the transmission part and is configured to rotate under the driving of the transmission part.

In some embodiments, the driving mechanism is a synchronous pulley driving mechanism, the driving member is a stepping motor, the transmission member is a synchronous toothed belt, the first rotating member and the second rotating member are synchronous pulleys, and a diameter of the first rotating member is smaller than a diameter of the second rotating member.

A neutron reflection experimental apparatus, comprising: the automatic sample changing device described above.

The utility model has the advantages that:

in the automatic sample changing device, the sample supporting mechanism can simply and quickly install a sample needing to be tested, and the driving mechanism and the positioning feedback mechanism can be mutually matched to enable different samples on the sample supporting mechanism to sequentially enter the test position to complete the neutron reflection test. Therefore, the neutron reflection experiment of all samples can be completed by utilizing the automatic sample changing device only by installing all samples on the sample supporting mechanism before the experiment is started. Therefore, precious beam time is saved, the stay time of experimenters entering a radiation area is shortened, the damage of radiation to the experimenters in the experimental process is reduced, and the experimental efficiency and the accuracy of experimental results are improved.

The neutron reflection experimental device can perform neutron reflection experiments on all samples set on the automatic sample changing device within a period of time, does not need experimenters to enter a radiation area to manually change the samples, reduces the damage of radiation to the experimenters in the experimental process, and improves the efficiency of the neutron reflection experiments and the accuracy of experimental results.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic perspective view of an automatic sample changer according to an embodiment of the present invention;

fig. 2 is a schematic top view of an automatic sample changer according to an embodiment of the present invention;

FIG. 3 is a schematic view of the structure of FIG. 2 taken along the line A-A;

fig. 4 is a schematic view of a partial explosion structure of a support, a sample holder, a mounting seat and a sample in an automatic sample changing device according to an embodiment of the present invention;

fig. 5 is a schematic perspective view of the automatic sample changer according to the present invention in a use state.

Reference numerals:

1. a support frame; 11. angular contact ball bearings; 12. a shaft sleeve; 13. a bearing pressure plate; 14. a first through hole;

2. a sample support mechanism; 21. a support member; 211. a rotating shaft part; 212. a turntable; 2121. a mating groove; 22. an air tube; 23. a manifold block; 24. a sample holder; 241. a second through hole; 25. a mounting seat; 26. a first joint; 27. a second joint; 28. a third joint;

3. a drive mechanism; 31. a drive member; 311. a drive member mounting member; 32. a first rotating member; 33. a transmission member; 34. a second rotating member;

4. a positioning feedback mechanism; 41. a grating; 42. a grating reading element;

100. a sample; 110. an electromagnet.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The specific structure of the automatic sample changing device according to the embodiment of the present invention will be described below with reference to fig. 1 to 5.

As shown in fig. 1-3, the automatic sample changing device of the present invention comprises a support frame 1, a sample support mechanism 2, a driving mechanism 3 and a positioning feedback mechanism 4. The sample supporting mechanism 2 is rotatably connected to the support frame 1, the sample supporting mechanism 2 is provided with a plurality of samples 100 along the circumferential direction, the driving mechanism 3 is arranged between the sample supporting mechanism 2 and the support frame 1, the driving mechanism 3 can drive the sample supporting mechanism 2 to rotate, the positioning feedback mechanism 4 is arranged on the sample supporting mechanism 2, and the positioning feedback mechanism 4 can read the rotation stroke of the sample supporting mechanism 2.

It can be understood that the support frame 1 can stably support the sample support mechanism 2, and the support frame 1 is provided with the first through hole 14 below the experimental position of the sample 100, so as to provide a better magnetic field environment for the sample 100 and improve the accuracy of the experimental result of the sample 100. When the sample holding mechanism 2 is rotated by the driving mechanism 3, the positions of the plurality of samples 100 arranged in the circumferential direction thereof are also rotated. Since the positioning feedback mechanism 4 can read the rotation stroke of the sample support mechanism 2, the positioning feedback mechanism 4 can monitor the positions of different samples 100 with high accuracy and feed them back to the drive mechanism 3. Under the action of the positioning feedback mechanism 4, when the sample 100 rotates to the experiment position, the driving mechanism 3 stops rotating and the experiment is carried out. After the experiment is finished, the driving mechanism 3 drives the sample supporting mechanism 2 to continue rotating, when the next sample 100 is located at the experiment position, the positioning feedback mechanism 4 feeds back the next sample to the driving mechanism 3 again, and the driving mechanism 3 stops moving, so that the purpose that the sample 100 at the experiment position is automatically switched and the experiment is carried out is achieved. In addition, because the position precision of the sample seat 24 can be adjusted according to the precision of the driving mechanism 3 and the sample supporting mechanism 2, the error caused in the manual sample changing and calibrating process is avoided, and the accuracy of the experimental result of the sample 100 is also improved.

Therefore, the utility model discloses an automatic device of changing a design is owing to have sample supporting mechanism 2, actuating mechanism 3 and 4 sample supporting mechanism of location feedback mechanism, can realize that a plurality of samples 100 get into the experimental position in proper order automatically to the neutron reflection experiment is accomplished under the effect of restraint streamline on the experimental position. Only need install all samples 100 on sample supporting mechanism 2 before the experiment begins, can utilize actuating mechanism 3 and location feedback mechanism 4 to mutually support and make the different samples 100 on sample supporting mechanism 2 get into the experimental position in proper order to accomplish the neutron reflection experiment of all samples 100. Therefore, precious beam time is saved, the stay time of personnel entering a radiation area is reduced, the damage of radiation to experimenters in the experimental process is reduced, and the experimental efficiency and the accuracy of experimental results are improved.

In some embodiments, as shown in FIG. 3, the positioning feedback mechanism 4 includes a grating 41 and a grating reader 42. The grating 41 is connected to the sample support mechanism 2, the grating reading member 42 is disposed on the support frame 1, and the grating reading member 42 can read the rotation angle of the grating 41.

It can be understood that the high precision positioning and feedback requirements in the neutron reflection experiment process require that the position positioning precision of the sample 100 reaches 2um, and the angle positioning precision reaches 0.001 deg. For this purpose, a grating 41 is provided on the sample support mechanism 2, and the reading on the grating 41 is read in real time by a grating reading member 42 to feed back the angle through which the sample support mechanism 2 rotates. The grating 41 with higher resolution and precision is selected, so that the sample supporting mechanism 2 can meet the requirements of high-precision positioning and feedback required by a neutron reflection experiment when rotating.

Preferably, the grating 41 in the positioning feedback mechanism 4 is a circular grating 41, the resolution of the positioning feedback mechanism 4 is 26 bits, and the grating reading member 42 can output 67108864 pulses every time the circular grating 41 rotates, and the angle of rotation of the circular grating 41 corresponding to each pulse is 0.000005 °.

In some embodiments, as shown in fig. 1-3, sample support mechanism 2 includes a support 21, an air tube 22, a manifold block 23, and a sample holder 24. One end of the supporting member 21 is rotatably connected to the supporting frame 1, a plurality of air pipes 22 are provided, the manifold block 23 is arranged on the upper surface of the supporting member 21, one side of the manifold block 23 is hermetically connected with the plurality of air pipes 22, the other side of the manifold block 23 is connected with a vacuum pump, a plurality of sample holders 24 are provided, each sample holder 24 is provided with a second through hole 241, each sample holder 24 is hermetically connected with the manifold block 23 through one air pipe 22, and the sample holder 24 adsorbs the sample 100 through the second through hole 241.

It will be appreciated that during neutron reflection experiments, the magnetic field direction needs to be parallel to the surface of the sample 100. In some devices that provide experimental magnetic fields, the center-to-center spacing of the electromagnets 110 defines the spatial location of the sample 100 in which it is mounted in a particular position, and cannot be simply placed in a laboratory vessel to perform neutron reflection experiments. Therefore, the utility model discloses a set up out vacuum environment on sample support mechanism 2 for sample 100 directly adsorbs under the atmospheric pressure effect on sample support mechanism 2, and the spatial position that further makes sample 100 can place wantonly, with the position demand that satisfies under the different experimental occasions.

Specifically, the sample support mechanism 2 is provided with a manifold block 23, an air tube 22, and a sample holder 24, which are connected in this order. The manifold block 23 is connected with the sample holder 24 in a sealing way through the air pipe 22, the sample holder 24 is provided with a second through hole 241, and the manifold block 23 is also connected with a vacuum pump. After the vacuum pump is turned on, the air in the manifold block 23 and the air pipe 22 is pumped away, and at this time, each sample 100 is respectively adsorbed on each sample holder 24 under the action of atmospheric pressure. The structure is simple and easy to implement, and the spatial position of the sample 100 can be simply changed by adjusting the shape of the opening of the sample seat 24, so that the automatic sample changing device can be applied to different experimental occasions, and the application range of the automatic sample changing device is improved.

In some embodiments, as shown in fig. 4, the support member 21 has a plurality of fitting grooves 2121 spaced apart from each other on the circumferential surface thereof, and the sample holder 24 is coupled to the fitting grooves 2121 via the mounting base 25.

It is understood that, in order to arrange the sample holders 24 at intervals along the circumferential surface of the support 21, a plurality of fitting grooves 2121 are arranged at intervals on the circumferential surface, the fitting grooves 2121 are provided with mounting seats 25, and the sample holders 24 can be arranged at intervals on the circumferential surface of the support 21 through the mounting seats 25. In addition, the mounting seat 25 is fitted in the fitting groove 2121, and the fitting groove 2121 can play a certain limiting role on the mounting seat 25, so that the connection stability between the mounting seat 25 and the sample seat 24 is ensured, the possibility of shaking of the mounting seat 25 in the rotating process of the support member 21 is avoided, and the stability of the sample 100 is further ensured. In addition, the structure can ensure that the supporting piece 21 is less exposed to the magnetic field condition of the experiment, and avoid the negative influence on the magnetic field so as to cause the error of the experiment result.

Preferably, sample holder 24 adopts boron-aluminum alloy spare, because boron has excellent neutron absorbing capacity, uses boron-aluminum alloy can reduce the spurious neutron reflection of sample holder 24 product, has improved the accuracy of neutron reflection experimental result. Of course, in other embodiments of the present invention, the sample holder 24 can be made of other materials, and can be selected according to actual requirements.

It should be noted that, although the utility model discloses not prescribing a limit to the fixed knot of sample seat 24 on support 21, only need satisfy sample seat 24 on support 21 global interval set up can, if set up sample seat 24 on support 21 upper surface, because subassembly such as grating 41 and trachea 22 in addition on sample seat 24, then must enlarge support 21's size, in addition, because the neutron reflection experiment in-process should guarantee that only sample 100 is located the utmost point post center of electro-magnet 110, also must increase sample seat 24's length, the cost of manufacture of automatic sample changing device has been improved like this, and also can't reach other beneficial effects.

In some embodiments, as shown in fig. 1-3, sample support mechanism 2 further comprises a first connector 26, a second connector 27, and a third connector 28. One end of the first connector 26 is hermetically connected with the manifold block 23, the other end of the first connector 26 is hermetically connected with the vacuum pump, the second connectors 27 are multiple, the manifold block 23 is hermetically connected with the air pipes 22 through the second connectors 27, the third connectors 28 are multiple, and each sample holder 24 is hermetically connected with one air pipe 22 through one third connector 28.

It can be understood that, in order to provide a vacuum environment inside the manifold block 23 and the air tube 22, a plurality of sealing tube threaded holes are required to be formed on the manifold block 23, and the plurality of sealing tube threaded holes are connected with each other in a vacuum manner inside the manifold block 23. In addition, in order to facilitate the connection between the gas pipe 22 and the manifold block 23, and the connection between the gas pipe 22 and the sample holder 24, a first joint 26, a second joint 27, and a third joint 28 are provided. The first connector 26 is connected with the manifold block 23 in a sealing mode through a threaded hole of the sealing pipe, and the other end of the first connector 26 is connected with an external vacuum pump through a hose. The second connector 27 is connected with the other sealing pipe threaded holes on the manifold block 23 in a sealing mode, and the other end of the second connector 27 is connected with the air pipe 22 in a sealing mode. The third joint 28 is connected to the gas tube 22 and the sample holder 24 at its two ends. Therefore, the stable setting of the vacuum environment in the sample supporting mechanism 2 is achieved, the sample 100 can be stably adsorbed on the sample seat 24 under the action of atmospheric pressure, and can not fall off from the sample seat 24 in the operation process of the automatic sample changing device, and the stability of the whole operation of the automatic sample changing device is improved.

Preferably, in order to avoid unnecessary damage to the air tube 22 and to optimize the arrangement of the air tube 22 on the sample support mechanism 2 during long-term practical use of the automatic sample changing device, the first connector 26 and the plurality of third connectors 28 are L type air tube 22 connectors, and the plurality of second connectors 27 are straight-through type air tube 22 connectors, since the sample support mechanism 2 is further provided with the positioning feedback mechanism 4, the sample holder 24 is directly connected with the air tube 22 by using a common air tube 22 connector under partial conditions, the L type air tube 22 connector can facilitate the connection of the first connector 26 with an external vacuum pump, and the air tube 22 between the second connector 27 and the third connector 28 is prevented from contacting with the positioning feedback mechanism 4 to damage the two connectors, thereby prolonging the service life of the automatic sample changing device.

In some embodiments, as shown in fig. 3, the support member 21 includes a rotating shaft portion 211 and a turntable 212. One end of the rotating shaft part 211 is rotatably fitted to the support frame 1, and the turntable 212 is connected to the other end of the rotating shaft part 211.

It can be understood that, when the rotating shaft portion 211 in the supporting member 21 and the rotating disc 212 are integrally formed, the processing process thereof is more complicated, which results in a great increase in the processing and manufacturing cost of the supporting member 21, therefore, the rotating shaft portion 211 in the supporting member 21 and the rotating disc 212 are separately arranged, one end of the rotating shaft portion 211 is fixedly connected with the rotating disc 212, and the other end of the rotating shaft portion 211 is rotatably arranged to be matched with the supporting frame 1, thereby ensuring that the supporting member 21 stably rotates and simultaneously reducing the cost of the supporting member 21.

Specifically, a groove is arranged in the support frame 1, an angular contact ball bearing 11 is arranged in the groove, the angular contact ball bearing 11 is fixed in the support frame 1 under the action of a bearing pressure plate 13, and one end of the rotating shaft portion 211 is matched with the angular contact ball bearing 11 through a shaft sleeve 12 to achieve the purpose of being in rotating connection with the support frame 1. Meanwhile, the angular contact ball bearing 11 arranged between the rotating shaft part 211 and the support frame 1 can convert sliding friction into rolling friction, so that the rotating resistance of the rotating shaft part 211 is reduced, and the stable rotation of the rotating shaft part 211 is ensured.

In some embodiments, as shown in fig. 3, each sample holder 24 is a vertical plane with the adsorption surface of the sample 100, and the distances between the adsorption surfaces of the sample holders 24 and the rotation axis of the support member 21 are equal.

It can be understood that the utility model discloses in, the required magnetic field environment of neutron reflection experiment is provided by the vertical electro-magnet 110 of placing, and the magnetic field direction is vertical and be subject to the centre-to-centre spacing of electro-magnet 110, and sample 100 needs vertical the placing just can accomplish the neutron reflection experiment when the magnetic field center is placed. Therefore, the adsorption surface of each sample seat 24 and the sample 100 is set to be a vertical plane, so that the purpose of completing the neutron reflection experiment without error is achieved, and the accuracy of the experiment result is improved. In other embodiments of the present invention, the absorption surface of each sample holder 24 and the sample 100 may not be a vertical surface, and may be determined according to the actual magnetic field environment.

In addition, in order to further ensure the positioning precision in the neutron reflection experiment process, the distances between the adsorption surfaces of the plurality of sample holders 24 and the rotating shaft of the support member 21 should be consistent and the same as the distance from the rotating shaft of the support member 21 to the center of the pole of the electromagnet 110, so that the accuracy of the experiment result is further improved.

In some embodiments, as shown in fig. 3, the driving mechanism 3 includes a driving member 31, a first rotating member 32, a transmission member 33, and a second rotating member 34. The driving member 31 is connected to the support frame 1, the first rotating member 32 is connected to the sample support mechanism 2, the first rotating member 32 is configured to rotate under the driving of the driving member 31, the transmission member 33 is connected to the first rotating member 32, the second rotating member 34 is connected to the transmission member 33, and the second rotating member 34 is configured to rotate under the driving of the transmission member 33.

It will be appreciated that since the sample support mechanism 2 needs to be located at the center of the pole of the electromagnet 110, if the driving member 31 is directly arranged below the pole to drive the electromagnet to rotate, the magnetic field uniformity is adversely affected, and further the error of the neutron reflection experiment is caused. For this purpose, the driving member 31 of the driving mechanism 3 should be located outside the center of the pole of the electromagnet 110, and therefore, the driving member 31 needs to drive the sample support mechanism 2 to rotate through the transmission member 33.

Specifically, the driving member 31 is disposed on the supporting frame 1, the driving member 31 drives the first rotating member 32 to rotate, the second rotating member 34 is connected to the first rotating member 32 through the transmission member 33, the second rotating member 34 is driven by the transmission member 33 to rotate, and the second rotating member 34 is connected to the sample supporting mechanism 2 and drives the sample supporting mechanism to rotate. Therefore, the purpose that the driving piece 31 drives the sample supporting mechanism 2 to rotate outside the experimental site is achieved.

In some embodiments, the driving mechanism 3 is a synchronous pulley driving mechanism 3, the driving member 31 is a stepping motor, the transmission member 33 is a synchronous cog belt, the first rotating member 32 and the second rotating member 34 are synchronous pulleys, and the diameter of the first rotating member 32 is smaller than that of the second rotating member 34.

It can be understood that the synchronous cog belt can be tensioned by increasing the center distance between the stepping motor and the rotating shaft of the sample support mechanism 2, and the synchronous cog belt can drive the sample support mechanism 2 completely synchronously under the tensioning action, so that the synchronous pulley drive mechanism 3 can drive the sample support mechanism 2 to complete high-precision rotation, thereby ensuring that each sample 100 is positioned at the center of the pole of the electromagnet 110, and improving the accuracy of the experimental result of the sample 100.

Specifically, the stepping motor is a five-phase stepping motor assembly with a planetary gear reduction box, the stepping motor is fixedly mounted on the support frame 1 through a driving piece mounting piece 311, and the first rotating piece 32 is fixedly mounted on an extension shaft of the stepping motor through a locking screw and is coaxially arranged with the extension shaft. Both sides of the timing belt are engaged with the first rotating member 32 and the second rotating member 34, respectively. The second rotating member 34 is fixedly mounted on the rotating shaft of the sample holding mechanism 2 by a locking screw and is arranged coaxially therewith.

Preferably, the basic step angle of the stepping motor is 0.0072 degrees, the rotation resolution of the synchronous belt drive mechanism 3 is 0.000144 degrees, and the automatic sample changing device can meet the requirement of the neutron reflection experiment that the sample 100 rotates and repeatedly positions with the precision of 0.001 degrees by matching with the positioning feedback mechanism 4 on the basis.

It should be added that, if the sample supporting mechanism 2 is driven to rotate by chain transmission, the larger gap between the chain and the chain wheel can cause the rotational positioning precision of the driven side chain wheel to fail to reach below one thousandth of degree, and the poor precision will cause the sample 100 to be positioned with larger error in the experimental process, and further affect the neutron reflection experiment, so that the reliability of the experimental result is reduced.

As shown in fig. 1-5, the neutron reflection experimental apparatus of the embodiment of the present invention includes the foregoing automatic sample changing apparatus.

It can be understood that the embodiment of the utility model provides an in the neutron reflection experimental apparatus, when sample 100 rotates to the utmost point post center of electro-magnet 110 under the automatic device effect that trades, actuating mechanism 3 stall and accomplish the neutron reflection experiment to sample 100 under the neutron spectrometer beam effect. After the experiment is finished, the driving mechanism 3 drives the sample supporting mechanism 2 to continue rotating, when the next sample 100 is located at the center of the pole of the electromagnet 110, the positioning feedback mechanism 4 feeds back the next sample to the driving mechanism 3 again, and the sample supporting mechanism 2 stops moving under the action of the driving mechanism 3 again. In the whole experiment process, the switch of the neutron spectrometer beam can be set according to the operation or the stop of the driving mechanism, so that the precious neutron spectrometer beam time can be saved, and the cost of neutron reflection experiments is reduced. The neutron reflection experiment is simultaneously carried out on a plurality of samples 100, and the efficiency of the whole experiment is improved. The automatic sample changing of the sample 100 avoids the position error of the sample 100 caused by manual sample changing calibration, and improves the accuracy and credibility of the whole experiment.

It should be added that the nonmagnetic material does not affect the magnetic field uniformity at the center of the pole of the electromagnet 110, and if the magnetic field distribution at the center of the pole of the electromagnet 110 is affected by the automatic sample changing device, the magnetic field uniformity at the center of the pole of the electromagnet 110 will not meet the requirement of neutron reflection experiment conditions, and the experiment result will be unreliable if the experiment is performed under the conditions. Therefore, in order to make the automatic sample changing device applicable under the condition of strong magnetic field and obtain reliable experimental results, the support frame 1, the sample supporting mechanism 2, the driving mechanism 3 and the positioning feedback mechanism 4 are all non-magnetic pieces.

Preferably, the grating 41, the rotating shaft portion 211, the first joint 26, the second joint 27 and the third joint 28 are all stainless steel pieces, the angular contact ball bearing 11 is a ceramic piece, and the support frame 1, the support member 21, the bearing pressure plate 13, the bushing 12, the driving member mounting member 311, the manifold block 23, the mounting seat 25, the first rotating member 32 and the second rotating member 34 are all aluminum alloy pieces. Of course, in other embodiments of the present invention, the above-mentioned components can also be made of other materials, and can be specifically selected according to actual needs.

In the description herein, references to the description of "some embodiments," "other embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims

1. An automatic sample changing device, comprising:

a support frame (1);

the sample supporting mechanism (2), the sample supporting mechanism (2) is rotatably connected on the supporting frame (1), and a plurality of samples (100) are arranged on the sample supporting mechanism (2) along the circumferential direction;

the driving mechanism (3) is arranged between the sample supporting mechanism (2) and the supporting frame (1), and the driving mechanism (3) can drive the sample supporting mechanism (2) to rotate;

the positioning feedback mechanism (4), the positioning feedback mechanism (4) is arranged on the sample supporting mechanism (2), and the positioning feedback mechanism (4) can read the rotation stroke of the sample (100) supporting mechanism.

2. The automated sample changing apparatus according to claim 1, wherein the positioning feedback mechanism (4) comprises:

a grating (41), the grating (41) being connected to the sample support mechanism (2);

the grating reading piece (42), grating reading piece (42) set up in on support frame (1), grating reading piece (42) can read the turned angle of grating (41).

3. The automated sample changing apparatus according to claim 1, wherein the sample holding mechanism (2) comprises:

a supporting piece (21), wherein one end of the supporting piece (21) is rotatably connected to the supporting frame (1);

a plurality of air pipes (22), wherein the air pipes (22) are arranged;

a manifold block (23), wherein the manifold block (23) is arranged on the upper surface of the support member (21), one side of the manifold block (23) is hermetically connected with the plurality of air pipes (22), and the other side of the manifold block (23) is connected with a vacuum pump;

the sample holder (24), the sample holder (24) is a plurality of, every sample holder (24) is equipped with second through-hole (241), every sample holder (24) with manifold block (23) through one trachea (22) sealed link, sample holder (24) through second through-hole (241) adsorb sample (100).

4. The device according to claim 3, wherein the support member (21) has a plurality of spaced-apart fitting grooves (2121) formed on a peripheral surface thereof, and the sample holder (24) is coupled to the fitting grooves (2121) via a mounting base (25).

5. The automated sample changing apparatus according to claim 3, wherein the sample holding mechanism (2) further comprises:

a first joint (26), wherein one end of the first joint (26) is hermetically connected with the manifold block (23), and the other end of the first joint (26) is hermetically connected with a vacuum pump;

a plurality of second joints (27), wherein the plurality of second joints (27) are used for sealing and connecting the manifold block (23) with the plurality of air pipes (22) respectively through the plurality of second joints (27);

a plurality of third joints (28), wherein each sample holder (24) is connected with one air pipe (22) in a sealing way through one third joint (28).

6. The automatic sample changing device according to claim 3, wherein the support member (21) comprises:

the rotating shaft part (211), one end of the rotating shaft part (211) is rotatably matched on the supporting frame (1);

and the rotating disc (212), wherein the rotating disc (212) is connected with the other end of the rotating shaft part (211).

7. The automatic sample changing device according to claim 3, wherein each sample holder (24) is a vertical plane with the adsorption surface of the sample (100), and the distances between the adsorption surfaces of the plurality of sample holders (24) and the rotation axis of the support member (21) are equal.

8. The automatic sample changing device according to claim 1, wherein the drive mechanism (3) comprises:

the driving piece (31), the driving piece (31) is connected with the support frame (1);

a first rotating member (32), wherein the first rotating member (32) is connected with the sample support mechanism (2), and the first rotating member (32) is configured to rotate under the driving of the driving member (31);

a transmission member (33), the transmission member (33) being connected to the first rotating member (32);

a second rotating member (34), wherein the second rotating member (34) is connected with the transmission member (33), and the second rotating member (34) is configured to rotate under the driving of the transmission member (33).

9. The automatic sample changing device according to claim 8, wherein the driving mechanism (3) is a synchronous pulley driving mechanism, the driving member (31) is a stepping motor, the transmission member (33) is a synchronous toothed belt, the first rotating member (32) and the second rotating member (34) are synchronous pulleys, and the diameter of the first rotating member (32) is smaller than that of the second rotating member (34).

10. A neutron reflection experimental apparatus, characterized in that, comprising the automatic sample changing apparatus of any one of claims 1 to 9.