Chromatograph convenient for feeding

Abstract

The utility model relates to the technical field of chromatographic instruments, in particular to a chromatographic instrument convenient for feeding. The chromatographic instrument convenient for feeding comprises a chromatographic instrument body, a sample inlet formed in the chromatographic instrument body and a sample injection needle located at the upper end of the chromatographic instrument body, the upper end of the chromatographic instrument body is fixedly connected with a fixed cylinder, the center position of the fixed cylinder corresponds to the sample inlet, the upper end of the chromatographic instrument body is provided with a guide cylinder, and the guide cylinder is fixedly connected with the fixed cylinder. The bottom end of the guide cylinder is inserted into the fixed cylinder, and the guide cylinder is matched with the fixed cylinder. The sample injection needle after sample injection returns to the initial position through the restoring force of the spring, feeding is more convenient, the guide cylinder can be taken down by rotating the rotating cover in the later period and separating the rotating cover from the fixed cylinder, and the upper end of the fixed rod is movably connected with the limiting groove, so that the sample injection needle can be directly taken down, and follow-up cleaning and sample injection of the sample injection needle are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of chromatographs, in particular to a chromatograph convenient for feeding. Background Technique

[0002] A chromatograph is a device used for chromatographic separation and analysis. It includes an injection system, a detection system, a recording and data processing system, a temperature control system, a mobile phase control system, etc. Modern chromatographs have the characteristics of high stability, sensitivity, versatility, and automation. There are gas chromatographs, liquid chromatographs, gel chromatographs, etc. These chromatographs are widely used for the analysis of the content of certain chemical products and polymer materials.

[0003] Chinese Patent Application CN214011145U, with a publication date of August 20, 2021, discloses a convenient-to-use liquid chromatograph and its feeding mechanism, including a liquid chromatograph body. An injection port is provided on the liquid chromatograph body. A fixed cylinder is integrally formed outside the injection port. A sampling needle is inserted into the fixed cylinder. A guiding cylinder is slidably sleeved at the lower end of the sampling needle. A return spring is connected between the guiding cylinder and the upper end of the sampling needle. When the utility model is in use, the lower end of the guiding cylinder is inserted into the fixed cylinder, and the sliding limit ring block is slid so that the lower surface of the limit ring block is in close contact with the upper surface of the limit ring. Pressing the sampling needle downward can insert the needle tube of the sampling needle into the injection port. Through the setting of the guiding cylinder, the sampling needle is guided, which is convenient for the needle tube of the sampling needle to be inserted into the injection port. Through the setting of the limit ring block, it is convenient to fix the limit ring and improve the stability of the guiding cylinder. Through the setting of the sealing ring, the sealing performance of the connection between the guiding tube and the fixed cylinder is improved, and the entry of air is reduced.

[0004] It guides the sampling needle through the guiding cylinder, which is convenient for the sampling needle to be inserted into the injection port, thus facilitating sample injection. Then, the return spring is used to realize the automatic reset of the sampling needle after sample injection. However, since the upper and lower ends of the spring are respectively fixedly connected to the sampling needle and the guiding cylinder, the guiding cylinder will be attached to the sampling needle during the subsequent cleaning or sample addition of the sampling needle, and the guiding cylinder will interfere with the cleaning process and sample addition process of the sampling needle, which is not convenient for the operation of the staff. Content of the Utility Model

[0005] In view of the above deficiencies in the prior art, the purpose of the present utility model is to provide a chromatograph convenient for feeding. After sample injection is completed, the sampling needle returns to the initial position through the restoring force of the spring, and the feeding is more convenient. Later, by rotating the rotating cover, the rotating cover is separated from the fixed cylinder, and the guiding cylinder can be removed. Since the upper end of the fixed rod is movably connected to the limiting groove, the sampling needle can also be directly removed, which is convenient for the subsequent cleaning and sample addition of the sampling needle.

[0006] The present utility model is implemented by adopting the following technical solutions:

[0007] The described chromatograph facilitating feeding includes a chromatograph body, a sampling port opened on the chromatograph body, and an injection needle located at the upper end of the chromatograph body. A fixed cylinder is fixedly connected to the upper end of the chromatograph body. The central position of the fixed cylinder corresponds to the sampling port. A guiding cylinder is provided at the upper end of the chromatograph body. The bottom end of the guiding cylinder is inserted into the fixed cylinder, and the guiding cylinder is adapted to the fixed cylinder. The injection needle is inserted into the guiding cylinder, and the bottom end of the injection needle penetrates through the guiding cylinder and is inserted into the sampling port. A rotary cover is sleeved on the outer side of the bottom end of the guiding cylinder. The rotary cover is threadedly connected to the guiding cylinder. The rotary cover is sleeved on the upper end of the fixed cylinder. Reset mechanisms are provided on both sides of the upper end of the injection needle.

[0008] Preferably, both of the reset mechanisms include a limit post, a fixed rod, a fixed block, a spring, a pressing block, and a limit groove. The limit post is fixedly connected to one side of the upper end of the injection needle. A limit groove is provided at the bottom end of the limit post. The fixed block is fixedly connected to the outer side of the guiding cylinder. A fixed rod is vertically fixed to the upper end of the fixed block. The top end of the fixed rod is inserted into the limit groove. A pressing block is movably sleeved on the upper end of the fixed rod.

[0009] Preferably, the upper end of the pressing block is in contact with the bottom end of the limit post, and a spring is fixedly connected between the bottom end of the pressing block and the fixed block. The spring is sleeved on the periphery of the fixed rod.

[0010] Preferably, positioning grooves are provided on both sides of the upper end of the fixed cylinder, and positioning blocks adapted to the positioning grooves are fixedly connected to both sides of the bottom end of the guiding cylinder. The two positioning blocks are respectively inserted into the two positioning grooves.

[0011] Preferably, the rotary cover is threadedly connected to the outer side of the upper end of the fixed cylinder.

[0012] Preferably, the distance between the bottom end of the injection needle and the bottom end of the sampling port is less than the distance between the top end of the fixed rod and the top wall of the limit groove.

[0013] The working principle of the present utility model is as follows:

[0014] During use, insert the bottom end of the guiding cylinder into the fixed cylinder. During the insertion process, through the cooperation of the positioning block and the positioning groove, quick positioning is facilitated. Then, rotate the rotary cover. The combination of the rotary cover and the fixed cylinder can further ensure the stability of the guiding cylinder, thus facilitating feeding. At the same time, the two limiting columns on both sides of the upper end of the sample injection needle will also be combined with the upper ends of the two fixed rods. The bottom ends of the two limiting columns are in contact with the upper ends of the two pressing blocks. Push the sample injection needle downward, and the limiting columns will push the pressing blocks downward. When the pressing blocks move downward, they will squeeze the springs. At this time, the bottom end of the sample injection needle will also be inserted into the sample injection port and inject the sample into the chromatograph body. After the sample injection is completed, release the sample injection needle, and the sample injection needle will return to the initial position through the restoring force of the spring, making feeding more convenient. Later, rotate the rotary cover, and separate the rotary cover from the fixed cylinder to remove the guiding cylinder. Since the upper end of the fixed rod is movably connected to the limiting groove, the sample injection needle can also be directly removed, facilitating subsequent cleaning and sample addition of the sample injection needle.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] For the chromatograph of the present utility model that facilitates feeding, the sample injection needle returns to the initial position after sample injection through the restoring force of the spring, making feeding more convenient. Later, rotate the rotary cover, and separate the rotary cover from the fixed cylinder to remove the guiding cylinder. Since the upper end of the fixed rod is movably connected to the limiting groove, the sample injection needle can also be directly removed, facilitating subsequent cleaning and sample addition of the sample injection needle. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the present utility model;

[0018] Figure 2 It is a schematic external structural diagram of the present utility model;

[0019] Figure 3 It is a schematic connection structural diagram of the guiding cylinder and the fixed cylinder of the present utility model;

[0020] Figure 4 It is a schematic structural diagram of the reset mechanism of the present utility model;

[0021] In the figure: 1, chromatograph body; 2, sample injection port; 3, fixed cylinder; 4, guiding cylinder; 5, sample injection needle; 6, reset mechanism; 61, limiting column; 62, fixed rod; 63, fixed block; 64, spring; 65, pressing block; 66, limiting groove; 7, rotary cover; 8, positioning groove; 9, positioning block. Detailed Embodiments

[0022] In order to make the purpose and technical solutions of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the drawings.

[0023] Embodiment 1

[0024] AsFigure 1 As shown in the figure, a chromatograph facilitating feeding includes a chromatograph body 1, a sampling port 2 opened on the chromatograph body 1, and an injection needle 5 located at the upper end of the chromatograph body 1. A fixed cylinder 3 is fixedly connected to the upper end of the chromatograph body 1. The central position of the fixed cylinder 3 corresponds to the sampling port 2. A guiding cylinder 4 is provided at the upper end of the chromatograph body 1. The bottom end of the guiding cylinder 4 is inserted into the fixed cylinder 3, and the guiding cylinder 4 is adapted to the fixed cylinder 3. The injection needle 5 is inserted into the guiding cylinder 4, and the bottom end of the injection needle 5 penetrates through the guiding cylinder 4 and is inserted into the sampling port 2. A rotating cover 7 is sleeved outside the bottom end of the guiding cylinder 4. The rotating cover 7 is threadedly connected to the guiding cylinder 4. The rotating cover 7 is sleeved on the upper end of the fixed cylinder 3. Reset mechanisms 6 are provided on both sides of the upper end of the injection needle 5. By rotating the rotating cover 7, the rotating cover 7 is separated from the fixed cylinder 3, and then the guiding cylinder 4 can be removed. Since the upper end of the fixed rod 62 is movably connected to the limiting groove 66, the injection needle 5 can also be directly removed, which is convenient for subsequent cleaning and sample addition of the injection needle 5.

[0025] As Figures 2 - 4 As shown in the figure, both of the two reset mechanisms 6 include a limiting post 61, a fixed rod 62, a fixed block 63, a spring 64, a pressing block 65, and a limiting groove 66. The limiting post 61 is fixedly connected to one side of the upper end of the injection needle 5. A limiting groove 66 is provided at the bottom end of the limiting post 61. The fixed block 63 is fixedly connected to the outside of the guiding cylinder 4. A fixed rod 62 is vertically fixed to the upper end of the fixed block 63. The top end of the fixed rod 62 is inserted into the limiting groove 66. A pressing block 65 is movably sleeved on the upper end of the fixed rod 62. The upper end of the pressing block 65 is attached to the bottom end of the limiting post 61. A spring 64 is fixedly connected between the bottom end of the pressing block 65 and the fixed block 63. The spring 64 is sleeved around the fixed rod 62. When the injection needle 5 is pushed downward, the limiting post 61 will push the pressing block 65 to move downward. When the pressing block 65 moves downward, the spring 64 is compressed. At this time, the bottom end of the injection needle 5 will also be inserted into the sampling port 2 and sample injection into the chromatograph body 1 is carried out. After the sample injection is completed, the injection needle 5 is released, and the injection needle 5 returns to the initial position by the restoring force of the spring 64, making the feeding more convenient. Positioning grooves 8 are provided on both sides of the upper end of the fixed cylinder 3. Positioning blocks 9 adapted to the positioning grooves 8 are fixedly connected to both sides of the bottom end of the guiding cylinder 4. The two positioning blocks 9 are respectively inserted into the two positioning grooves 8. During the process of inserting the guiding cylinder 4 into the fixed cylinder 3, through the cooperation of the positioning block 9 and the positioning groove 8, rapid positioning is facilitated. The rotating cover 7 is threadedly connected to the outer side of the upper end of the fixed cylinder 3, which can further ensure the stability of the guiding cylinder 4 and is also convenient for subsequent disassembly of the guiding cylinder 4. The distance between the bottom end of the injection needle 5 and the bottom end of the sampling port 2 is less than the distance between the top end of the fixed rod 62 and the top wall of the limiting groove 66, ensuring that the injection needle 5 can be inserted into the sampling port 2.

[0026] Specifically, when the utility model is in use, the bottom end of the guiding cylinder 4 is inserted into the fixed cylinder 3. During the insertion process, through the cooperation of the positioning block 9 and the positioning groove 8, it is convenient for quick positioning. Then, the rotary cover 7 is rotated. The combination of the rotary cover 7 and the fixed cylinder 3 can further ensure the stability of the guiding cylinder 4, thus facilitating feeding. At the same time, the two limiting columns 61 on both sides of the upper end of the injection needle 5 will also be combined with the upper ends of the two fixed rods 62. The bottom ends of the two limiting columns 61 are in contact with the upper ends of the two pressing blocks 65. When the injection needle 5 is pushed downward, the limiting column 61 will push the pressing block 65 downward. When the pressing block 65 moves downward, it will squeeze the spring 64. At this time, the bottom end of the injection needle 5 will also be inserted into the sample inlet 2 and inject the sample into the chromatograph body 1. After the injection is completed, the injection needle 5 is released. The injection needle 5 returns to the initial position through the restoring force of the spring 64, making the feeding more convenient. Later, when the rotary cover 7 is rotated and the rotary cover 7 is separated from the fixed cylinder 3, the guiding cylinder 4 can be removed. Since the upper end of the fixed rod 62 is movably connected to the limiting groove 66, the injection needle 5 can also be directly removed, facilitating the subsequent cleaning and sample addition of the injection needle 5.

Claims

1. A chromatograph facilitating feeding, comprising a chromatograph body (1), a sampling port (2) opened on the chromatograph body (1), and a sampling needle (5) located at the upper end of the chromatograph body (1), characterized in that: A fixed cylinder (3) is fixedly connected to the upper end of the chromatograph body (1). The central position of the fixed cylinder (3) corresponds to the sample injection port (2). A guiding cylinder (4) is provided at the upper end of the chromatograph body (1). The bottom end of the guiding cylinder (4) is inserted into the fixed cylinder (3). The guiding cylinder (4) is adapted to the fixed cylinder (3). The sample injection needle (5) is inserted into the guiding cylinder (4). The bottom end of the sample injection needle (5) penetrates through the guiding cylinder (4) and is inserted into the sample injection port (2). A rotating cover (7) is sleeved on the outer side of the bottom end of the guiding cylinder (4). The rotating cover (7) is threadedly connected to the guiding cylinder (4). The rotating cover (7) is sleeved on the upper end of the fixed cylinder (3). Reset mechanisms (6) are provided on both sides of the upper end of the sample injection needle (5).

2. The chromatography instrument facilitating feeding according to claim 1, wherein: There are two of the reset mechanisms (6), each including a limit post (61), a fixed rod (62), a fixed block (63), a spring (64), a pressing block (65), and a limit groove (66). The limit post (61) is fixedly connected to one side of the upper end of the sample injection needle (5). A limit groove (66) is provided at the bottom end of the limit post (61). The fixed block (63) is fixedly connected to the outer side of the guiding cylinder (4). A fixed rod (62) is vertically fixed to the upper end of the fixed block (63). The top end of the fixed rod (62) is inserted into the limit groove (66). The upper end of the fixed rod (62) is movably sleeved with a pressing block (65).

3. The chromatograph facilitating feeding according to claim 2, wherein: The upper end of the pressing block (65) is in contact with the bottom end of the limit post (61). A spring (64) is fixedly connected between the bottom end of the pressing block (65) and the fixed block (63). The spring (64) is sleeved around the fixed rod (62).

4. The chromatograph facilitating feeding according to claim 1, wherein: Positioning grooves (8) are provided on both sides of the upper end of the fixed cylinder (3). Positioning blocks (9) adapted to the positioning grooves (8) are fixedly connected to both sides of the bottom end of the guiding cylinder (4). The two positioning blocks (9) are respectively inserted into the two positioning grooves (8).

5. The chromatography instrument facilitating feeding according to claim 1, wherein: The rotating cover (7) is threadedly connected to the outer side of the upper end of the fixed cylinder (3).

6. The chromatograph facilitating feeding according to claim 2, characterized in that: The distance between the bottom end of the sample injection needle (5) and the bottom end of the sample injection port (2) is less than the distance between the top end of the fixed rod (62) and the top wall of the limit groove (66).

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