Novel X-ray diffractometer

Abstract

The utility model discloses a novel X-ray diffractometer which comprises a goniometer mainboard, an X-ray light tube, a slit fixing device, a detector driving device, a sample driving device, a turntable mechanism and a detector, the turntable mechanism is mounted on the goniometer main board, the turntable mechanism comprises a mounting panel rotationally connected to the top of the goniometer main board and a driver used for driving the mounting panel to rotate, and the driver is mounted in the goniometer main board; according to the utility model, the rotating speed ratio of the mounting panel to the sample is 1: 1, the rotating directions are opposite, the rotation of the mounting panel counteracts the rotation of the sample placing seat, so that the sample is kept horizontal and immovable, the rotating speed ratio of the detector to the sample is 2: 1, and the detector and the sample rotate anticlockwise; and the measurement precision of data is only determined by the mechanical precision of the detector driving device, so that the measurement precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of X-ray detection equipment, in particular to a novel X-ray diffractometer. Background Art

[0002] X-ray diffractometer uses the principle of diffraction to accurately measure the crystal structure, texture and stress of materials, and accurately perform phase analysis, qualitative analysis and quantitative analysis. It is widely used in metallurgy, petroleum, chemical industry, scientific research, aerospace, teaching, material production and other fields.

[0003] X-ray diffractometers come in many forms and for different purposes, but their basic structure is very similar. This is the basic structural principle diagram of an X-ray diffractometer. The main components include four parts.

[0004] (1) A high-stability X-ray source provides the X-rays required for measurement. Changing the anode target material of the X-ray tube can change the wavelength of the X-rays, and adjusting the anode voltage can control the intensity of the X-ray source.

[0005] (2) The goniometer system, which usually consists of a turntable driven by a stepper motor or servo motor;

[0006] (3) Sample and sample position adjustment mechanism system The sample must be a solid block of single crystal, powder, polycrystalline or microcrystalline;

[0007] (4) X-ray detector, which detects the diffraction intensity or diffraction direction at the same time. The polycrystalline diffraction spectrum data can be obtained through the instrument measurement and recording system or the computer processing system.

[0008] There are two common designs of goniometers for diffractometers, one with a moving X-ray light source and the other with a fixed one. The corresponding sample stage design can be divided into horizontal sample placement or tilted sample placement. The advantage of the first horizontal sample placement is that the sample is always horizontal during the measurement process, which can ensure that there is no risk of powder sample spilling, so it has become the mainstream design. However, the goniometer of this design needs to drive the movement of the ray light source throughout the measurement process, and its corresponding worm gear structure bears a large load, and the accuracy will decrease in long-term operation. At the same time, the error in data measurement is the superposition of the mechanical errors of the light source drive mechanism and the detector drive mechanism, which exceeds the single mechanical error of any of the drive mechanisms. The second design is that the light source on the goniometer is fixed, and the two motors of the goniometer drive the sample and the detector. Therefore, the angle of the sample is always changing during the measurement process, and there is a risk of the sample spilling. The advantage of this design is that the load of the drive mechanism is small and the service life is long. At the same time, the measurement accuracy is determined by the mechanical accuracy of the detector motor, so it is higher than the first one. Therefore, in response to the above problems, the applicant designed a new type of X-ray diffractometer that combines the advantages of the two goniometers to improve the above problems. Utility Model Content

[0009] 1. Technical problems to be solved by the utility model

[0010] In view of the deficiencies in the prior art, the purpose of the present utility model is to provide a new type of X-ray diffractometer, which controls the rotation direction and speed of the turntable mechanism, the sample drive device and the detector so that the sample drive device remains stationary and the measurement accuracy of the data is only determined by the mechanical accuracy of the detector drive device, thereby improving the measurement accuracy.

[0011] 2. Technical solution

[0012] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0013] A novel X-ray diffractometer comprises a goniometer mainboard, an X-ray tube and a slit fixing device, a detector driving device, a sample driving device, a turntable mechanism and a detector;

[0014] The turntable mechanism is installed on the goniometer mainboard, and the turntable mechanism includes a mounting panel rotatably connected to the top of the goniometer mainboard and a driver for driving the mounting panel to rotate, and the driver is installed inside the goniometer mainboard;

[0015] The X-ray tube and slit fixing device is fixedly installed on one side of the top of the installation panel, and the X-ray tube and slit fixing device is used to install the X-ray tube and the slit for transmitting X-rays;

[0016] The detector driving device is fixedly mounted at the top center of the mounting panel, and the detector is fixedly mounted on the detector driving device;

[0017] A mounting hole is arranged at the center of the detector driving device, and the sample driving device is installed on the mounting panel through the mounting hole.

[0018] Preferably, the sample driving device includes a rotating shaft, a sample placement seat and a driving member, the driving member is fixedly mounted on the top of the mounting panel, the rotating shaft is fixedly connected to the output end of the driving member, the rotating shaft and the mounting hole of the detector driving device are rotatably connected through a bearing, and the sample placement seat is fixedly connected to the top of the rotating shaft.

[0019] Preferably, the rotation axis coincides with a central axis of the detector driving device.

[0020] Preferably, the driver drives the mounting panel to rotate clockwise, the detector driving device drives the detector to rotate counterclockwise, and the driving member drives the rotating shaft and the sample placement seat to rotate counterclockwise.

[0021] Preferably, the speed ratio between the driver and the driving member is 1:1, and the speed ratio between the detector driving device and the driving member is 2:1.

[0022] Preferably, the detector driving device and the driver both adopt a worm gear driving structure.

[0023] Preferably, the detector is a small one-dimensional or two-dimensional array detector.

[0024] Preferably, a counterweight is fixedly connected to a side of the top of the mounting panel away from the X-ray tube and the slit fixing device.

[0025] 3. Beneficial effects

[0026] Compared with the prior art, the beneficial effects of the utility model are:

[0027] (1) The utility model forms a firm relative position relationship by firmly fixing the X-ray tube, the detector and the sample driving device on the mounting panel, thereby ensuring the firmness and stability of the overall mechanism.

[0028] (2) The utility model has a rotation speed ratio of 1:1 between the mounting panel and the sample, and the rotation is opposite. The rotation of the mounting panel offsets the rotation of the sample holder, so that the sample remains horizontal and motionless. The rotation speed ratio of the detector and the sample is 2:1, both rotate counterclockwise. The measurement accuracy of the data is only determined by the mechanical accuracy of the detector drive device, thereby improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a new type of X-ray diffractometer;

[0030] Figure 2 This is a top view of a new type of X-ray diffractometer;

[0031] Figure 3 This is the front view of the new X-ray diffractometer.

[0032] In the figure: 1. goniometer main board; 2. X-ray tube and slit fixing device; 3. detector driving device; 4. counterweight; 5. sample driving device; 501. rotating shaft; 502. sample placement seat; 6. turntable mechanism; 601. mounting panel; 602. driver; 7. detector. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0034] Example:

[0035] See also Figure 1-Figure 3 , this embodiment provides a novel X-ray diffractometer, including a goniometer mainboard 1, an X-ray tube and slit fixing device 2, a detector driving device 3, a sample driving device 5, a turntable mechanism 6 and a detector 7;

[0036] The turntable mechanism 6 is installed on the goniometer mainboard 1, and the turntable mechanism 6 includes a mounting panel 601 rotatably connected to the top of the goniometer mainboard 1 and a driver 602 for driving the mounting panel 601 to rotate. The mounting panel 601 is a circular structure, and the driver 602 is installed inside the goniometer mainboard 1.

[0037] The X-ray tube and slit fixing device 2 is fixedly installed on one side of the top of the mounting panel 601, and the X-ray tube and slit fixing device 2 is used to install the X-ray tube and the slit for transmitting X-rays;

[0038] The detector driving device 3 is fixedly mounted at the top center of the mounting panel 601, and the detector 7 is fixedly mounted on the detector driving device 3;

[0039] A mounting hole is provided at the center of the detector driving device 3 , and the sample driving device 5 is installed on the mounting panel 601 through the mounting hole.

[0040] In this embodiment, by firmly fixing the X-ray tube, the detector 7 and the sample driving device 5 on the mounting panel 601, a firm relative position relationship is formed, thereby ensuring the firmness and stability of the overall mechanism.

[0041] As an implementation method of this embodiment, Figure 1As shown, the sample driving device 5 includes a rotating shaft 501, a sample placement seat 502 and a driving member, wherein the driving member is fixedly mounted on the top of the mounting panel 601, the rotating shaft 501 is fixedly connected to the output end of the driving member, the rotating shaft 501 is rotatably connected to the mounting hole of the detector driving device 3 through a bearing, the sample placement seat 502 is fixedly connected to the top of the rotating shaft 501, and the sample placement seat 502 is used to fix the sample to be measured, and the rotating shaft 501 is driven by the driving member to rotate the sample placement seat 502 for measurement, wherein the rotating shaft 501 coincides with the central axis of the detector driving device 3, so that the sample placement seat 502 and the detector 7 can rotate independently to avoid position displacement.

[0042] As an implementation method of this embodiment, Figure 1 As shown, the detector drive device 3 and the driver 602 both adopt a worm gear drive structure for driving the rotation of the mounting panel 601 and the detector 7. The worm gear drive structure is a prior art and will not be elaborated on here. The detector 7 adopts a small one-dimensional or two-dimensional array detector, which, in conjunction with the corresponding independently developed measurement software, can obtain high measurement intensity.

[0043] As an implementation method of this embodiment, Figure 1 and Figure 2 As shown, the driver 602 drives the installation panel 601 to rotate clockwise, and through the clockwise rotation of the installation panel 601, the installation panel 601 drives the X-ray tube and the slit fixing device 2, the detector 7 and the sample driving device 5 to rotate clockwise synchronously, wherein the driving member drives the rotating shaft 501 and the sample placement seat 502 to rotate counterclockwise, and the speed ratio of the driver 602 and the driving member is 1:1, so that the two rotations of the installation panel 601 and the driving member cancel each other, ensuring that the sample always remains horizontal and motionless, and secondly, the detector driving device 3 drives the detector 7 to rotate counterclockwise, and the speed ratio of the detector driving device 3 and the driving member is 2:1, and the measurement accuracy of the data is only determined by the mechanical accuracy of the detector driving device 3, thereby improving the measurement accuracy.

[0044] As an implementation method of this embodiment, Figure 1 and Figure 2 As shown, a counterweight 4 is fixedly connected to one side of the top of the mounting panel 601 away from the X-ray tube and the slit fixing device 2. The weight of the counterweight 4 is substantially the same as the weight of the X-ray tube and the slit fixing device 2, so that the weight on both sides of the mounting panel 601 is balanced, thereby improving the stability of the mounting panel 601 when rotating.

[0045] Working principle: When in use, place the sample on the sample holder 502, turn on the power of the device host and the computer respectively, start and set the measurement program, the driver 602 drives the installation panel 601 to rotate clockwise, the driving member drives the rotating shaft 501 and the sample holder 502 to rotate counterclockwise, the detector drive device 3 drives the detector 7 to rotate counterclockwise, and start measuring data. During the measurement process, the rotation speed ratio of the installation panel 601 and the sample is 1:1, and the rotation directions are opposite. The rotation of the installation panel 601 offsets the rotation of the sample holder 502, thereby keeping the sample horizontal and motionless. The rotation speed ratio of the detector 7 and the sample is 2:1, both rotate counterclockwise, and the measurement accuracy of the data is only determined by the mechanical accuracy of the detector drive device 3, thereby improving the measurement accuracy.

[0046] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A new type of X-ray diffractometer, characterized in that: It comprises a goniometer mainboard (1), an X-ray tube and slit fixing device (2), a detector driving device (3), a sample driving device (5), a turntable mechanism (6) and a detector (7); The turntable mechanism (6) is mounted on the goniometer mainboard (1), the turntable mechanism (6) comprises a mounting panel (601) rotatably connected to the top of the goniometer mainboard (1) and a driver (602) for driving the mounting panel (601) to rotate, and the driver (602) is mounted inside the goniometer mainboard (1); The X-ray tube and slit fixing device (2) is fixedly mounted on one side of the top of the mounting panel (601), and the X-ray tube and slit fixing device (2) is used to install the X-ray tube and the slit for transmitting X-rays; The detector driving device (3) is fixedly mounted at the top center of the mounting panel (601), and the detector (7) is fixedly mounted on the detector driving device (3); A mounting hole is provided at the center of the detector driving device (3), and the sample driving device (5) is installed on the mounting panel (601) through the mounting hole.

2. A novel X-ray diffractometer according to claim 1, characterized in that: The sample driving device (5) comprises a rotating shaft (501), a sample placement seat (502) and a driving member, wherein the driving member is fixedly mounted on the top of the mounting panel (601), the rotating shaft (501) is fixedly connected to the output end of the driving member, the rotating shaft (501) is rotatably connected to the mounting hole of the detector driving device (3) via a bearing, and the sample placement seat (502) is fixedly connected to the top of the rotating shaft (501).

3. A novel X-ray diffractometer according to claim 2, characterized in that: The rotation axis (501) coincides with the central axis of the detector driving device (3).

4. A novel X-ray diffractometer according to claim 2, characterized in that: The driver (602) drives the mounting panel (601) to rotate clockwise, the detector driving device (3) drives the detector (7) to rotate counterclockwise, and the driving member drives the rotating shaft (501) and the sample placement seat (502) to rotate counterclockwise.

5. A novel X-ray diffractometer according to claim 4, characterized in that: The speed ratio between the driver (602) and the driving member is 1:1, and the speed ratio between the detector driving device (3) and the driving member is 2:

1.

6. A novel X-ray diffractometer according to claim 5, characterized in that: The detector driving device (3) and the driver (602) both adopt a worm gear driving structure.

7. A novel X-ray diffractometer according to claim 1, characterized in that: The detector (7) is a small one-dimensional or two-dimensional array detector.

8. A novel X-ray diffractometer according to claim 1, characterized in that: A counterweight (4) is fixedly connected to the top of the mounting panel (601) at one side away from the X-ray tube and the slit fixing device (2).

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