Needle inserting and sampling device of thermal desorption instrument
By introducing a moving ring limit protection structure into the thermal desorption instrument, the problems of needle bending and sample level deviation during needle insertion are solved, and the needle protection and the smooth operation of injection are achieved.
Patent Information
- Application Number
- CN202421922548.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-08-09
AI Technical Summary
The needle-pinning structure of traditional thermal desorption instruments can easily lead to the bending of the needle, resulting in sample deviation and needle damage.
A needle injection device including a mounting plate, a support plate, a motor, a screw, a wire master and a moving ring is designed. Through the cooperation of the screw and a wire master, the moving ring is protected at the outer periphery of the injection needle assembly to prevent the needle from bending, and maintain the mobility of the injection needle assembly during the needle insertion process.
It effectively prevents needle bending and sample level deviation, avoids needle damage, and does not affect the smooth progress of injection operation. It has a simple structure and is suitable for promotion and use.
Smart Images
Figure CN223244489U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of analytical technology processing devices, in particular to a needle sampling device of a thermal desorption instrument. Background Art
[0002] Thermal desorption injection technology is a widely used injection technology at present. Thermal desorption injection technology is to place the solid sample or the adsorption tube adsorbed with the analyte in a thermal desorption device, which is directly connected to the chromatograph. The carrier gas enters the chromatograph inlet through the thermal desorption device. When the thermal desorption device increases the temperature, the volatile components are released from the solid sample or adsorbent and enter the gas chromatography system with the carrier gas for analysis and determination. The needle structure in traditional thermal desorption instruments is relatively simple. The motor directly drives the needle up and down. There is no auxiliary needle mechanism. The needle often bends, resulting in sample position deviation and needle damage. Therefore, we designed a needle injection device for thermal desorption instruments that can prevent needle bending. Utility Model Content
[0003] The utility model provides a needle sampling device for a thermal desorption instrument, which is used to solve the defects in the prior art.
[0004] The utility model is achieved through the following technical solutions:
[0005] The cam is fixedly mounted on the support frame, and the motor is fixedly mounted on the support frame. The motor is fixedly mounted on the support frame, and a coaxial screw rod is fixedly mounted on the output shaft of the motor. The outer peripheral thread of the screw rod is matched with the coaxial nut. The screw rod is rotatably mounted on the cross plate, and the cross plate is connected to the support plate. An injection needle assembly is mounted on one side of the nut. A fixed plate is fixedly mounted on one side of the cross plate. A second through hole is provided on the fixed plate. The injection needle assembly is slidably mounted in the second through hole. Several movable rings are slidably mounted on the outer periphery of the injection needle assembly. The movable ring on the top side is fixedly connected to one side of the nut. Adjacent movable rings are connected by a scissor frame. The top side of the scissor frame is hinged to the movable ring on the top side. The bottom ends of the scissor frame are respectively hinged to the sliders. The fixed plate has a sliding groove corresponding to the slider, and the slider is slidably mounted in the sliding groove.
[0006] As described above, a needle sampling device for a thermal desorption instrument has sliding rods at both ends of the screw rod, and the two ends of the sliding rod are fixedly installed on the support plate and the cross plate in sequence. Sliding sleeves are slidably installed on the outer periphery of the sliding rod, and the sliding sleeves are fixedly connected to the nut.
[0007] In the above-mentioned needle sampling device of the thermal desorption instrument, through grooves are respectively provided on both sides of the movable ring, and a vertical rod is slidably installed in the corresponding through grooves, and the vertical rod is fixedly installed on the fixed plate.
[0008] In the needle sampling device of the thermal desorption instrument as described above, the slider is a dovetail slider, and the slide groove is a dovetail slide groove.
[0009] In the needle injection device of the thermal desorption instrument as described above, the inner circumference of the movable ring is provided with a thread, the inner circumference thread of the movable ring cooperates with the installation of the outer threaded ring, and the inner circumference of the outer threaded ring is in sliding contact with the injection needle assembly.
[0010] The advantages of the utility model are: the utility model has a simple structure and an ingenious design. The movable ring can be distributed on the periphery of the injection needle assembly to provide position limiting protection for it, thereby preventing the needle from bending during the injection process, resulting in sample position deviation, and even causing damage to the needle. At the same time, the movable ring can finally move the injection needle assembly, and while providing protection, it does not affect the use of the injection needle assembly. The operation is simple, can meet actual needs, and is suitable for promotion. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0012] Figure 1 It is a structural diagram of the utility model; Figure 2 yes Figure 1 A-direction view; Figure 3 yes Figure 2 B-direction view.
[0013] Figure numerals: 1. Mounting plate, 2. First through hole, 3. Bolt, 4. Support plate, 5. Motor, 6. Screw rod, 7. Nut, 8. Injection needle assembly, 9. Horizontal plate, 10. Fixed plate, 11. Second through hole, 12. Moving ring, 13. Scissors frame, 14. Slider, 15. Slide groove, 20. Slide rod, 21. Sliding sleeve, 30. Through groove, 31. Vertical rod, 50. External threaded ring. DETAILED DESCRIPTION
[0014] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.
[0015] A needle sampling device for a thermal desorption instrument, such as Figure 1 、 2As shown in Figure 3, it includes a mounting plate 1, a plurality of first through holes 2 are provided on the mounting plate 1, a bolt 3 is provided in the first through hole 2, a support plate 4 is fixedly installed on the mounting plate 1, a motor 5 is fixedly installed on the support plate 4, a coaxial screw rod 6 is fixedly installed on the output shaft of the motor 5, the outer peripheral thread of the screw rod 6 is fitted with a coaxial nut 7, the nut 7 can only move up and down along the screw rod 6, the screw rod 6 is rotatably mounted on the transverse plate 9, the bottom end of the screw rod 6 is rotatably mounted on the transverse plate 9 through a bearing, the transverse plate 9 is connected to the support plate 4, an injection needle assembly 8 is installed on one side of the nut 7, a fixed plate 10 is fixedly installed on one side of the transverse plate 9, a second through hole 11 is provided on the fixed plate 10, the injection needle assembly 8 is slidably mounted in the second through hole 11, a plurality of moving rings 12 are slidably mounted on the periphery of the injection needle assembly 8, and the moving ring 12 Distributed on the periphery of the needle body of the injection needle assembly 8, the topmost moving ring 12 is fixedly connected to one side of the nut 7, and adjacent moving rings 12 are connected by a scissor frame 13. The scissor frame 13 is a scissor structure. The scissor frame 13 includes a multi-layer cross-hinged connecting rod group, wherein the connecting rod groups of the scissor frame 13 are opposite to each other, and each pair of opposite connecting rod groups are rotatably connected by a rotating shaft. The upper and lower ends of the connecting rods of each pair of upper and lower adjacent connecting rod groups are hingedly connected by a rotating shaft. The front and rear sides of the moving ring 12 are provided with a scissor frame 13, and the top side of the scissor frame 13 is hinged to the topmost moving ring 12, and the bottom ends of the scissor frame 13 are respectively hinged to the slider 14. A slide groove 15 is provided on the fixed plate 10 corresponding to the slider 14, and the slider 14 is slidably installed in the slide groove 15, and the slider 14 can only slide in the slide groove 15. The utility model has a simple structure and ingenious design. The movable ring 12 can be distributed on the outer periphery of the injection needle assembly 8 to provide position limiting protection for it, thereby preventing the needle from bending during the injection process, resulting in sample position deviation, and even causing damage to the needle. At the same time, the movable ring 12 can finally move the injection needle assembly 8, and while providing protection, it does not affect the use of the injection needle assembly 8. The operation is simple, can meet actual needs, and is suitable for promotion.When using the utility model, first put the bolt 3 into the first through hole 2, install the mounting plate 1 and the support plate 4 on the thermal desorption instrument through the bolt 3, align the injection needle assembly 8 with the sample, power on the motor 5, start the motor 5, and the output shaft of the motor 5 drives the screw rod 6 to rotate, and the nut 7 drives the injection needle assembly 8 and the topmost moving ring 12 to move downward, and the injection needle assembly 8 slides in the second through hole 11, and the injection needle assembly 8 pricks the sample. At this time, the moving rings 12 are evenly distributed on the periphery of the needle body of the injection needle assembly 8, and the moving ring 12 can prevent the injection needle assembly from being stuck during the prick process. The needle body part of the component 8 is bent, the sample position deviation occurs, and even the needle tip is damaged. At the same time, when the sampling needle assembly 8 is moving, the topmost moving ring 12 moves downward with the nut 7, the distance between the moving rings 12 is reduced, the scissor fork frame 13 is folded, and the scissor fork frame 13 drives the corresponding slider 13 to slide back to each other, and the moving ring 12 moves with the movement of the sampling needle assembly 8, and the moving ring 12 always protects the sampling needle assembly 8, and as the sampling needle assembly 8 moves downward, the distance between the moving rings 12 is reduced, which can prevent the moving ring 12 from affecting the use of the sampling needle assembly 8.
[0016] Specifically, as shown in the figure, the ends of the screw rod 6 in this embodiment are respectively provided with a slide rod 20, and the ends of the slide rod 20 are fixedly mounted on the support plate 4 and the cross plate 9 in sequence. The outer periphery of the slide rod 20 is slidably mounted with a slide sleeve 21, and the slide sleeve 21 is fixedly connected to the nut 7. When the nut 7 moves, the slide sleeve 21 can limit the nut 7 and prevent the nut 7 from rotating with the screw rod 6.
[0017] Specifically, as shown in the figure, the movable ring 12 of this embodiment has two through-grooves 30 on both sides, and the two through-grooves 30 are arranged diagonally. A vertical rod 31 is slidably installed in the corresponding through-grooves 30, and the vertical rod 31 is fixedly mounted on the fixed plate 10. The vertical rod 31 can limit the movable ring 12 when it moves, preventing the movable ring 12 from shifting.
[0018] Furthermore, as shown in the figure, the slider 14 of this embodiment is a dovetail slider, and the chute 15 is a dovetail chute. The dovetail slider is slidably mounted in the dovetail chute to prevent the dovetail slider from moving out of the dovetail chute when the scissor frame 13 moves.
[0019] Furthermore, as shown in the figure, the inner circumference of the movable ring 12 of this embodiment is provided with a thread, and the inner circumference thread of the movable ring 12 cooperates with the installation of the external thread ring 50, and the inner circumference of the external thread ring 50 slides and contacts with the injection needle assembly 8. When using injection needle assemblies 8 of different sizes, the injection needle assembly 8 is first removed from the nut 7. At this time, the external thread ring 50 is unscrewed from the movable ring 12. The external thread ring 50 of different sizes is replaced according to the injection needle 8 of different sizes, so that the inner circumference of the external thread ring 50 can slide and contact with the injection needle assemblies 8 of different sizes, thereby ensuring that the movable ring 12 can limit the injection needle assemblies 8 of different sizes.
[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.
Claims
1. A needle injection device for a thermal desorption instrument, comprising a mounting plate (1), a plurality of first through holes (2) are provided on the mounting plate (1), bolts (3) are provided in the first through holes (2), a support plate (4) is fixedly installed on the mounting plate (1), a motor (5) is fixedly installed on the support plate (4), a coaxial screw rod (6) is fixedly installed on the output shaft of the motor (5), the outer peripheral thread of the screw rod (6) is fitted with a coaxial nut (7), the screw rod (6) is rotatably mounted on a transverse plate (9), the transverse plate (9) is connected to the support plate (4), an injection needle assembly (8) is mounted on one side of the nut (7), a fixed plate (10) is fixedly installed on one side of the transverse plate (9), a second through hole (11) is provided on the fixed plate (10), and the injection needle assembly (8) is slidably mounted in the second through hole (11), characterized in that: Several movable rings (12) are slidably installed on the periphery of the injection needle assembly (8), the movable ring (12) on the top side is fixedly connected to one side of the nut (7), and adjacent movable rings (12) are connected by a scissor frame (13), the top side of the scissor frame (13) is hinged on the movable ring (12) on the top side, and the bottom ends of the scissor frame (13) are respectively hinged on the slider (14), and a slide groove (15) is opened on the fixed plate (10) corresponding to the slider (14), and the slider (14) is slidably installed in the slide groove (15).
2. The needle sampling device of a thermal desorption instrument according to claim 1, characterized in that: Slide rods (20) are respectively provided at both ends of the screw rod (6), and both ends of the slide rod (20) are fixedly mounted on the support plate (4) and the cross plate (9) in sequence. Slide sleeves (21) are respectively slidably mounted on the outer periphery of the slide rod (20), and the slide sleeves (21) are fixedly connected to the nut (7).
3. The needle sampling device of a thermal desorption instrument according to claim 1, characterized in that: Through slots (30) are respectively provided on both sides of the movable ring (12), and a vertical rod (31) is slidably installed in the corresponding through slots (30), and the vertical rod (31) is fixedly installed on the fixed plate (10).
4. The needle sampling device of a thermal desorption instrument according to claim 1, characterized in that: The slider (14) is a dovetail slider, and the chute (15) is a dovetail chute.
5. The needle sampling device of a thermal desorption instrument according to claim 1, characterized in that: The inner circumference of the movable ring (12) is provided with a thread, and the inner circumference thread of the movable ring (12) cooperates with the installation of the outer thread ring (50), and the inner circumference of the outer thread ring (50) is in sliding contact with the injection needle assembly (8).