A sample environment providing system suitable for a small-angle neutron scattering spectrometer

Abstract

The application discloses a sample environment providing system suitable for a small-angle neutron scattering spectrometer, which comprises a vacuum cavity, one end of the vacuum cavity is fixedly provided with a vacuum cavity door, a neutron beam incident window is arranged on the vacuum cavity door, the other end of the vacuum cavity is provided with an emission window, an electrode assembly, a sample replacement table, a frame assembly and a heat energy exchange platform are arranged in the vacuum cavity, and an ultraviolet light source irradiation port is arranged on the top of the vacuum cavity. The sample environment providing system suitable for the small-angle neutron scattering spectrometer is integrated with multiple functions such as electric field force control, ultraviolet light source polymerization, temperature control and sample automatic transportation, the uniform field strength can be obtained according to the design of electrode parameter structure, the diversity of sample environment of the spallation neutron source is greatly enriched, and powerful support and guarantee are provided for the future multidisciplinary development and application of the neutron source large scientific device.

Description

Technical Field

[0001] This invention relates to the field of small-angle neutron scattering technology, specifically a sample environment provision system suitable for small-angle neutron scattering spectrometers. Background Technology

[0002] Small-angle neutron scattering (SANS) is a powerful, non-destructive technique that can provide information about the structure and composition of matter, and has been widely applied in various fields in recent years. The sample environment is becoming increasingly important because most cutting-edge scientific neutron scattering is conducted under specific sample conditions. External electric fields have long been a very useful tool for manipulating matter from the molecular to the micrometer scale and are one of the important external forces for controlling the physicochemical properties of materials.

[0003] Currently, there have been some reports on the progress of sample environments for various neutron sources, but there is very little information on the development of electric fields as sample environments. When using electric fields for scientific research, both domestically and internationally, most methods involve direct energization or inserting conductive tubes or wires directly into the sample to obtain an electric field, rarely considering field strength uniformity and breakdown voltage. The constraints that usually limit the practicality of electric field devices are field strength uniformity and breakdown voltage. Field strength uniformity is not only closely related to factors such as electrode size, material, geometry, and gas environment, but also requires consideration of practical factors such as spatial location, surface treatment, and combining electrode size and configuration with the actual situation of neutron scattering experiments.

[0004] Regarding the design progress of electric field sample environment devices for small-angle neutron scattering spectrometers both domestically and internationally, there is still no complete system for providing electric field sample environments. Moreover, most of the electric field devices already in use generally suffer from drawbacks such as limited application scenarios, difficulty in sample installation, complex experimental operations, poor field strength uniformity, low safety performance, and limited functionality, making it difficult to provide a good system for providing sample environments for small-angle neutron scattering spectrometers. Based on this, we propose a sample environment providing system suitable for small-angle neutron scattering spectrometers to address the shortcomings of existing technologies. Summary of the Invention

[0005] The purpose of this invention is to provide a sample environment provision system suitable for small-angle neutron scattering spectrometers, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A sample environment provision system suitable for small-angle neutron scattering spectrometers includes a vacuum chamber. A vacuum chamber door is fixedly installed at one end of the vacuum chamber, and a neutron beam incident window is provided on the vacuum chamber door. An exit window is provided at the other end of the vacuum chamber. An electrode assembly, a sample replacement stage, a frame assembly, and a heat exchange platform are provided inside the vacuum chamber. An ultraviolet light source irradiation port is provided at the top of the vacuum chamber.

[0008] As a further embodiment of the present invention: the frame assembly includes a top plate, a right side plate, a bottom plate, and a left side plate. The right side plate and the left side plate are symmetrically arranged on both sides of the top of the bottom plate. The tops of the right side plate and the left side plate are both attached to the bottom of the top plate. A first frame fixing strip and a second frame fixing strip are symmetrically fixedly connected to one side of the right side plate. The right side plate is fixedly connected to the top plate via the first frame fixing strip, and to the bottom plate via the second frame fixing strip. A third frame fixing strip and a fourth frame fixing strip are symmetrically fixedly connected to one side of the left side plate. The left side plate is fixedly connected to the bottom plate via the third frame fixing strip, and to the top plate via the fourth frame fixing strip. The top plate of the frame is fixedly connected. The electrode assembly includes an upper electrode fixing base, a lower electrode fixing seat, an upper electrode, a lower electrode, a first electrode support rod, a second electrode support rod, and electrode fixing seat bolts. The upper electrode fixing base is fixedly installed on the top of the frame top plate, and the lower electrode fixing seat is fixedly installed on the bottom of the frame bottom plate. The upper electrode is positioned directly above the lower electrode. The bottom end of the first electrode support rod is fixedly connected to the top of the upper electrode. The top end of the first electrode support rod passes through the frame top plate and extends into the upper electrode fixing base, where it is locked and fixed by the electrode fixing seat bolts. The top end of the second electrode support rod is fixedly connected to the bottom of the lower electrode. The bottom end of the second electrode support rod passes through the frame bottom plate and extends into the inner side of the lower electrode fixing seat, where it is locked and fixed by the electrode fixing seat bolts.

[0009] As a further embodiment of the present invention: the heat exchange platform includes a first heat exchange platform bracket, a heat exchange platform assembly, and a second heat exchange platform bracket. Both the first and second heat exchange platform brackets are fixedly connected to the base plate of the frame. The heat exchange platform assembly is provided with a second hexagon socket screw, which is used to fix the heat exchange platform assembly to the first and second heat exchange platform brackets. A placement groove is provided on the top of the heat exchange platform assembly, and a heating medium circulation channel is provided in the placement groove. A heat exchange ceramic plate is fixedly connected to the top of the heating medium circulation channel in the placement groove. The heat exchange platform assembly is provided with a heating oil outlet and a heating oil inlet, which are respectively connected to the outlet and inlet of the heating medium circulation channel.

[0010] As a further embodiment of the present invention: the sample changing table includes a slide rail base plate, which is fixedly connected to one side of the left side plate of the frame. A first coupling bracket and a second coupling bracket are fixedly connected to the slide rail base plate. A first internal hexagon screw is provided on the first coupling bracket, which is fixedly connected to the slide rail base plate by the first internal hexagon screw. A trapezoidal lead screw is rotatably connected to the first coupling bracket and the second coupling bracket via bearings. A vacuum stepper motor is fixedly connected to the side wall of the first coupling bracket. One end of the trapezoidal lead screw is fixedly connected to the output shaft of the vacuum stepper motor via a coupling. The outer side of the trapezoidal lead screw extends laterally through... A vertical slider assembly is threaded and fitted with a slide rail. A slide rail is fixedly connected to the slide rail base plate. The vertical slider assembly is slidably connected to the slide rail. A limit bracket is fixedly connected to the slide rail base plate. A vertical slider is fixedly installed on the vertical slider assembly. A gear shaft is fixedly connected to the vertical slider. A gear is rotatably fitted on the gear shaft. A sample holder is fixedly connected to one end of the gear shaft. A rack is fixedly connected to the top inner side of the limit bracket. The gear meshes with the rack. A vertical pressure block is provided on the upper part of the vertical slider. A fastening screw is provided on the vertical pressure block. The vertical pressure block is fixedly connected to the vertical slider by the fastening screw. A vertical slider accessory is fixedly connected to the lower part of the vertical slider.

[0011] As a further embodiment of the present invention: one side of the vacuum chamber is provided with a motor wiring inlet, a vacuum pump interface, a spare interface, a gas exchange port and a high-voltage power supply inlet, and the other side of the vacuum chamber is provided with an oil circuit interface.

[0012] As a further aspect of the present invention: a vacuum gauge interface communicating with the interior of the vacuum chamber is fixedly connected to the top of the vacuum chamber.

[0013] As a further embodiment of the present invention: the bottom of the vacuum cavity is symmetrically and fixedly connected with a first cavity base and a second cavity base.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention is applicable to the sample environment supply system of a small-angle neutron scattering spectrometer. Through the coordinated operation of various components, it can be used in conjunction with the small-angle neutron scattering spectrometer, making it easy to operate. By integrating high-voltage equipment such as electrodes into a vacuum chamber, it effectively avoids accidental high-voltage contact, greatly improving the safety of personnel operation. Furthermore, the adjustable electrodes not only generate excellent field strength uniformity but also allow for adjustable and controllable electric field force, better meeting experimental requirements. The sample changing stage, controlled by a vacuum stepper motor, ensures precise displacement and facilitates convenient and safe sample transport. The heat exchange platform enables temperature control around the sample, greatly enriching experimental conditions. After the scattering electric field is applied through the provided ultraviolet light source irradiation inlet, the sample can be transported by the sample rack to a designated location for ultraviolet light source focusing. It is feature-rich and easy to use.

[0016] 2. This invention is applicable to the sample environment provision system of a small-angle neutron scattering spectrometer. By integrating multiple functions such as electric field force control, ultraviolet light source aggregation, temperature control, and automatic sample transportation, it can realize automatic sample transport and is suitable for samples of different sizes. The electrode parameters and structure can be designed according to the user to obtain a uniform field strength, which greatly enriches the diversity of the sample environment of the spallation neutron source. This provides strong support and guarantee for the future multidisciplinary development and application of large-scale scientific facilities for neutron sources. In addition, it has positive significance for meeting the needs of researchers to use large-scale scientific facilities to conduct basic and applied research on advanced materials under electric field conditions. Attached Figure Description

[0017] Figure 1 This provides an overall schematic diagram of the system's operation, suitable for sample environments in small-angle neutron scattering spectrometers.

[0018] Figure 2 A three-dimensional structural schematic diagram of the system is provided for the sample environment suitable for small-angle neutron scattering spectrometers.

[0019] Figure 3 Provides a partial side view of the system for sample environments suitable for small-angle neutron scattering spectrometers.

[0020] Figure 4 Provides a partial side view of the system for sample environments suitable for small-angle neutron scattering spectrometers.

[0021] Figure 5 A schematic diagram of the sample changing stage in the system is provided to provide a sample environment suitable for small-angle neutron scattering spectrometers.

[0022] Figure 6 A side view of the sample changing stage in the system is provided for the sample environment suitable for small-angle neutron scattering spectrometers.

[0023] Figure 7A three-dimensional view of the vertical slider assembly in the system is provided for the sample environment suitable for small-angle neutron scattering spectrometers.

[0024] Figure 8 A schematic diagram of the heat exchange platform in the system is provided to provide a sample environment suitable for small-angle neutron scattering spectrometers.

[0025] Figure 9 This provides a schematic diagram of the internal structure of the heat exchange platform in the system, suitable for sample environments in small-angle neutron scattering spectrometers.

[0026] Figure 10 Provides a local stereoscopic view of the system for sample environments suitable for small-angle neutron scattering spectrometers.

[0027] Figure 11 This provides a schematic diagram showing the disassembly of the frame assembly in the system, suitable for sample environments in small-angle neutron scattering spectrometers.

[0028] Figure 12 This is a cross-sectional view of the electrode profile.

[0029] Figure 13 A cross-sectional view of the thermal exchange platform assembly in the system is provided for the sample environment suitable for small-angle neutron scattering spectrometers.

[0030] The diagram shows: Vacuum chamber 1, Vacuum chamber door 2, Neutron beam incident window 3, First chamber base 4, Motor wiring inlet 5, Vacuum pump interface 6, Spare interface 7, Gas exchange port 8, High-voltage power supply inlet 9, Second chamber base 10, Ultraviolet light source irradiation port 11, Vacuum gauge interface 12, Oil circuit interface 13, Electrode assembly 14, Sample changing stage 15, Frame assembly 16, Heat exchange platform 17, Upper electrode fixing base 18, Frame top plate 19, First frame fixing strip 20, Frame right side plate 21, Second frame fixing strip 22, Frame bottom plate 23, Third frame fixing strip 24, Frame left side plate 25, Fourth frame fixing strip 26, Lower electrode fixing seat 27, Electrode fixing seat bolt 28, Slide rail base plate 29. Vacuum stepper motor 30, coupling 31, first coupling bracket 32, vertical slider assembly 33, sample holder 34, limit bracket 35, second coupling bracket 36, rack 37, slide rail 38, first internal hex screw 39, trapezoidal lead screw 40, injection window 41, vertical pressure block 42, fastening screw 43, vertical slider 44, gear shaft 45, vertical slider accessory 46, heat exchange ceramic plate 47, second internal hex screw 48, first heat exchange platform bracket 49, heat energy exchange platform assembly 50, second heat exchange platform bracket 51, heating oil outlet 52, heating oil inlet 53, heating medium circulation channel 54, upper electrode 55, lower electrode 56, first electrode support rod 57, second electrode support rod 58, gear 59. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1-13 In this embodiment of the invention, a sample environment provision system suitable for a small-angle neutron scattering spectrometer includes a vacuum chamber 1. A vacuum chamber door 2 is fixedly installed at one end of the vacuum chamber 1. The vacuum chamber door 2 can be easily opened and closed. A neutron beam incident window 3 is provided on the vacuum chamber door 2. An exit window 41 is provided at the other end of the vacuum chamber 1. An electrode assembly 14, a sample changing stage 15, a frame assembly 16, and a heat exchange platform 17 are provided inside the vacuum chamber 1.

[0033] The frame assembly 16 includes a top plate 19, a right side plate 21, a bottom plate 23, and a left side plate 25. The right side plate 21 and the left side plate 25 are symmetrically arranged on both sides of the top of the bottom plate 23. The tops of both the right side plate 21 and the left side plate 25 are attached to the bottom of the top plate 19. A first frame fixing strip 20 and a second frame fixing strip 22 are symmetrically fixedly connected to one side of the right side plate 21. The right side plate 21 is fixedly connected to the top plate 19 via the first frame fixing strip 20 and to the bottom plate 23 via the second frame fixing strip 22. A third frame fixing strip 24 and a fourth frame fixing strip 26 are symmetrically fixedly connected to one side of the left side plate 25. The left side plate 25 is fixedly connected to the bottom plate 23 via the third frame fixing strip 24 and to the top plate 19 via the fourth frame fixing strip 26. The electrode assembly 14 is fixedly connected and includes an upper electrode fixing base 18, a lower electrode fixing seat 27, an upper electrode 55, a lower electrode 56, a first electrode support rod 57, a second electrode support rod 58, and an electrode fixing seat bolt 28. The upper electrode fixing base 18 is fixedly installed on the top of the frame top plate 19, and the lower electrode fixing seat 27 is fixedly installed on the bottom of the frame bottom plate 23. The upper electrode 55 is positioned directly above the lower electrode 56. The bottom end of the first electrode support rod 57 is fixedly connected to the top of the upper electrode 55, and the top end of the first electrode support rod 57 passes through the frame top plate 19 and extends into the upper electrode fixing base 18, where it is locked and fixed by the electrode fixing seat bolt 28. The top end of the second electrode support rod 58 is fixedly connected to the bottom of the lower electrode 56, and the bottom end of the second electrode support rod 58 passes through the frame bottom plate 23 and extends into the inner side of the lower electrode fixing seat 27, where it is locked and fixed by the electrode fixing seat bolt 28.

[0034] The heat exchange platform 17 includes a first heat exchange platform bracket 49, a heat exchange platform assembly 50, and a second heat exchange platform bracket 51. Both the first heat exchange platform bracket 49 and the second heat exchange platform bracket 51 are fixedly connected to the frame base plate 23. The heat exchange platform assembly 50 is provided with a second hexagon socket screw 48, which is fixedly connected to the first heat exchange platform bracket 49 and the second heat exchange platform bracket 51. The top of the heat exchange platform assembly 50 has a placement groove, and a heating medium circulation channel 54 is provided in the placement groove. A heat exchange ceramic plate 47 is fixedly connected to the top of the heating medium circulation channel 54 in the placement groove. The heat exchange platform assembly 50 is provided with a heating oil outlet 52 and a heating oil inlet 53, which are respectively connected to the outlet and inlet of the heating medium circulation channel 54.

[0035] The sample changing table 15 includes a slide rail base plate 29, which is fixedly connected to one side of the left side plate 25 of the frame. A first coupling bracket 32 ​​and a second coupling bracket 36 are fixedly connected to the slide rail base plate 29. A first hexagon socket screw 39 is provided on the first coupling bracket 32, which is fixedly connected to the slide rail base plate 29 by the first hexagon socket screw 39. A trapezoidal lead screw 40 is rotatably connected to the first coupling bracket 32 ​​and the second coupling bracket 36 through bearings. A vacuum stepper motor 30 is fixedly connected to the side wall of the first coupling bracket 32. One end of the trapezoidal lead screw 40 is fixedly connected to the output shaft of the vacuum stepper motor 30 through a coupling. A vertical slider assembly 33 is threaded laterally through the outer side of the trapezoidal lead screw 40. A slide rail 38 is fixedly connected to the slide rail base plate 29. The vertical slider assembly 33 is slidably connected to the slide rail 38. A limit bracket 35 is fixedly connected to the slide rail base plate 29. A vertical slider 44 is fixedly installed on the vertical slider assembly 33. A gear shaft 45 is fixedly connected to the vertical slider 44. A gear 59 is rotatably sleeved on the gear shaft 45. A sample holder 34 is fixedly connected to one end of the gear shaft 45. A rack 37 is fixedly connected to the top inner side of the limit bracket 35. The gear 59 meshes with the rack 37. A vertical pressure block 42 is provided on the upper part of the vertical slider 44. A fastening screw 43 is provided on the vertical pressure block 42. The vertical pressure block 42 is fixedly connected to the vertical slider 44 by the fastening screw 43. A vertical slider accessory 46 is fixedly connected to the lower part of the vertical slider 44.

[0036] The vacuum chamber 1 is provided with a motor wiring inlet 5, a vacuum pump interface 6, a spare interface 7, a gas exchange port 8 and a high-voltage power supply inlet 9 on one side. The top of the vacuum chamber 1 is provided with an ultraviolet light source irradiation port 11. The other side of the vacuum chamber 1 is provided with an oil circuit interface 13.

[0037] The top of the vacuum chamber 1 is fixedly connected to a vacuum gauge interface 12 that communicates with its interior.

[0038] The bottom of the vacuum cavity 1 is symmetrically and fixedly connected to a first cavity base 4 and a second cavity base 10.

[0039] Both the upper electrode 55 and the lower electrode 56 are Bruce electrodes.

[0040] The heating oil outlet 52 and heating oil inlet 5 are both connected to the external hot oil circulation system through the oil circuit interface 13 via pipelines. The upper electrode 55 and lower electrode 56 are both connected to the external control system through wires and high-voltage power supply inlet 9. The vacuum stepper motor 30 is connected to the external control system through wires. The vacuum gauge interface 12 is used to install a vacuum gauge to monitor the vacuum level in the vacuum chamber 1.

[0041] Example 1

[0042] Bruce proposed an electrode scheme, such as Figure 12 As shown, the electrode cross-sectional profile is divided into three parts. The first part begins with a linear section of radius R0, followed by a sinusoidal section extending radially by a distance A, and finally terminates with a circular section. Each section smoothly merges tangentially into the next section, as shown in the reference section. Figure 12 In a coordinate system, the sinusoidal cross-sectional profile can be represented as:

[0043]

[0044] In the formula, x0 and R e These are the x-coordinate of the circle's center and the circle's radius, respectively.

[0045] To ensure a smooth transition between the various parts defining the Bruce profile, Re and X0 must be defined according to the following definitions.

[0046]

[0047]

[0048] In the above formula, α0 is the characteristic angle of the sine function of the cross section.

[0049] Therefore, the total radius R and thickness T of the electrode can be expressed as:

[0050]

[0051]

[0052] The size of the design based on the neutron scattering experiment is:

[0053] Size designed based on neutron scattering experiments:

[0054] R0=40mm, A=20mm, α0=60°

[0055] radius of arc:

[0056]

[0057]

[0058] Electrode thickness:

[0059]

[0060] The functional relationship of the sinusoidal profile:

[0061]

[0062] Total electrode radius:

[0063]

[0064] Total electrode diameter:

[0065] D = 2R = 208mm.

[0066] The working principle of this invention is:

[0067] The sample is placed on the sample holder 34. A neutron source emits an incident neutron beam, which strikes the sample through the neutron beam incident window 3 and then through the exit window 41 before hitting the detector. Simultaneously, a high voltage is applied to the upper electrode 55 and lower electrode 56, generating a uniform electric field. This electric field acts on the sample. The electric field generated by the upper electrode 55 and lower electrode 56 is adjustable and controllable, effectively meeting the requirements for the sample's electric field. By controlling the energization of the vacuum stepper motor 30, the rotating end of the vacuum stepper motor 30 drives the trapezoidal lead screw 40 to rotate. The rotation of the trapezoidal lead screw 40 moves the vertical slider assembly 33, thereby moving the sample holder 34. The movement of the sample holder 34 moves the sample's position. Furthermore, the sample holder 34 can... The sample is moved forward to the designated position and irradiated with ultraviolet light through the ultraviolet light source irradiation port 11 into the vacuum chamber 1. The sample holder 34 moves the sample to the underside of the ultraviolet light source for ultraviolet light aggregation. Through the setting of the heat exchange platform 17, hot oil enters the heating medium circulation channel 54 through the heating oil inlet 53 and then exits through the heating oil outlet 52. The circulation of hot oil continuously provides heat. During the heating process, heat is exchanged to the heat exchange ceramic plate 47. The heat emitted by the heat exchange ceramic plate 47 provides the ambient temperature required for the test around the sample. Furthermore, the ambient temperature around the sample can be controlled by controlling the input oil temperature. Combined with small-angle neutron scattering and under the electric field force, the structural characteristics and physicochemical properties of the material can be studied in situ.

[0068] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sample environment provisioning system suitable for small-angle neutron scattering spectrometers, comprising a vacuum chamber (1), characterized in that: A vacuum chamber door (2) is fixedly installed at one end of the vacuum chamber (1). A neutron beam incident window (3) is provided on the vacuum chamber door (2). An exit window (41) is provided at the other end of the vacuum chamber (1). An electrode assembly (14), a sample replacement stage (15), a frame assembly (16), and a heat exchange platform (17) are provided inside the vacuum chamber (1). An ultraviolet light source irradiation port (11) is provided at the top of the vacuum chamber (1). The frame assembly (16) includes a frame top plate (19), a frame right side plate (21), a frame bottom plate (23), and a frame left side plate (25). The electrode assembly (14) includes an upper electrode fixing base (18), a lower electrode fixing seat (27), an upper electrode (55), a lower electrode (56), a first electrode support rod (57), a second electrode support rod (58), and an electrode fixing seat bolt (28). The upper electrode fixing base (18) is fixedly installed on the top of the frame top plate (19), and the lower electrode fixing seat (27) is fixedly installed on the bottom of the frame bottom plate (23). The upper electrode (55) is positioned directly above the lower electrode (56). The bottom end of the first electrode support rod (57) is fixedly connected to the top of the upper electrode (55). The top end of the first electrode support rod (57) passes through the top plate (19) of the frame and extends into the upper electrode fixing base (18), where it is locked by the electrode fixing seat bolt (28). The top end of the second electrode support rod (58) is fixedly connected to the bottom of the lower electrode (56). The bottom end of the second electrode support rod (58) passes through the bottom plate (23) of the frame and extends into the inner side of the lower electrode fixing seat (27), where it is locked by the electrode fixing seat bolt (28). Both the upper electrode (55) and the lower electrode (56) are Bruce electrodes, which generate a uniform field strength through adjustable electrodes, making the electric field force adjustable and controllable.

2. The sample environment provision system for small-angle neutron scattering spectrometers according to claim 1, characterized in that: The right side plate (21) and the left side plate (25) of the frame are symmetrically arranged on both sides of the top of the bottom plate (23) of the frame. The top of the right side plate (21) and the left side plate (25) are both attached to the bottom of the top plate (19) of the frame. A first frame fixing strip (20) and a second frame fixing strip (22) are symmetrically fixedly connected to one side of the right side plate (21). The right side plate (21) is fixed to the top plate (19) of the frame through the first frame fixing strip (20). The right side panel (21) of the frame is fixedly connected to the bottom panel (23) of the frame through the second frame fixing strip (22). The left side panel (25) of the frame is symmetrically fixedly connected to one side with a third frame fixing strip (24) and a fourth frame fixing strip (26). The left side panel (25) of the frame is fixedly connected to the bottom panel (23) of the frame through the third frame fixing strip (24), and the left side panel (25) of the frame is fixedly connected to the top panel (19) of the frame through the fourth frame fixing strip (26).

3. The sample environment provision system for small-angle neutron scattering spectrometers according to claim 1, characterized in that: The heat exchange platform (17) includes a first heat exchange platform bracket (49), a heat exchange platform assembly (50), and a second heat exchange platform bracket (51), which are fixedly connected. On the frame base plate (23), a second hexagon socket screw (48) is provided on the heat exchange platform assembly (50). The heat exchange platform assembly (50) is fixedly connected to the first heat exchange platform bracket (49) and the second heat exchange platform bracket (51) through the second hexagon socket screw (48). A placement groove is provided on the top of the heat exchange platform assembly (50). A heating medium circulation channel (54) is provided in the placement groove. A heat exchange ceramic plate (47) is fixedly connected to the top of the heating medium circulation channel (54) in the placement groove. A heating oil outlet (52) and a heating oil inlet (53) are provided on the heat exchange platform assembly (50). The heating oil outlet (52) and the heating oil inlet (53) are respectively connected to the outlet and inlet of the heating medium circulation channel (54).

4. The sample environment provision system for small-angle neutron scattering spectrometers according to claim 1, characterized in that: The sample changing table (15) includes a slide rail base plate (29), which is fixedly connected to one side of the left side plate (25) of the frame. A first coupling bracket (32) and a second coupling bracket (36) are fixedly connected to the slide rail base plate (29). A first internal hexagon screw (39) is provided on the first coupling bracket (32). The first coupling bracket (32) is fixedly connected to the slide rail base plate (29) by the first internal hexagon screw (39). A trapezoidal lead screw (40) is rotatably connected to the first coupling bracket (32) and the second coupling bracket (36) through bearings. A vacuum stepper motor (30) is fixedly connected to the side wall of the first coupling bracket (32). One end of the trapezoidal lead screw (40) is fixedly connected to the output shaft of the vacuum stepper motor (30) through a coupling. A vertical slider assembly (33) is threaded through the outer side of the trapezoidal lead screw (40). A slide rail (38) is fixedly connected to the plate (29). The vertical slider assembly (33) is slidably connected to the slide rail (38). A limit bracket (35) is fixedly connected to the slide rail base plate (29). A vertical slider (44) is fixedly installed on the vertical slider assembly (33). A gear shaft (45) is fixedly connected to the vertical slider (44). A gear (59) is rotatably sleeved on the gear shaft (45). A sample is fixedly connected to one end of the gear shaft (45). The frame (34) has a rack (37) fixedly connected to the top of the inner side of the limiting bracket (35), and the gear (59) meshes with the rack (37). A vertical pressure block (42) is provided on the upper part of the vertical slider (44), and a fastening screw (43) is provided on the vertical pressure block (42). The vertical pressure block (42) is fixedly connected to the vertical slider (44) by the fastening screw (43). A vertical slider accessory (46) is fixedly connected to the lower part of the vertical slider (44).

5. The sample environment provision system for small-angle neutron scattering spectrometers according to claim 1, characterized in that: The vacuum chamber (1) is provided with a motor wiring inlet (5), a vacuum pump interface (6), a spare interface (7), a gas exchange port (8) and a high-voltage power supply inlet (9) on one side, and an oil circuit interface (13) on the other side.

6. The sample environment provision system for small-angle neutron scattering spectrometers according to claim 1, characterized in that: The top of the vacuum chamber (1) is fixedly connected to a vacuum gauge interface (12) that communicates with its interior.

7. The sample environment provision system for small-angle neutron scattering spectrometers according to claim 1, characterized in that: The bottom of the vacuum cavity (1) is symmetrically and fixedly connected to a first cavity base (4) and a second cavity base (10).

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