Gas chromatography multi-channel automatic sample injector

Abstract

The utility model relates to the technical field of automatic sample injectors, and discloses a gas chromatography multi-channel automatic sample injector which comprises a needle tube, an adjusting assembly is arranged on the back of the outer side of the needle tube and used for controlling the needle tube to move and sample injection, a stability limiting assembly is arranged on the outer side of the needle tube, and the stability limiting assembly is used for limiting the stability of the needle tube. And the stability limiting assembly is used for improving the stability of the sample injection process. According to the gas chromatography multi-channel automatic sample injector, the adjusting assembly is installed, a telescopic push rod can be used for controlling a pressing head at the top through a piston rod to conduct height adjustment, the height of a control needle tube is adjusted while adjustment is conducted, and when a lifting plate is lowered to the top of an adjusting plate, continuous pressing is conducted to compress a supporting spring; therefore, the lower pressing head is used for pushing the drawing piston to inject the internal liquid into the chromatograph, and the height and extrusion can be controlled by using the single group of telescopic push rods, so that the cost is reduced, and meanwhile, the energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic sample injectors, in particular to a gas chromatographic multi-channel automatic sample injector. Background Art

[0002] When the gas chromatograph is conducting a test, it is usually necessary to use a syringe to inject the liquid to be tested into the chromatograph through the injection hole. In order to facilitate the rapid injection of the test sample, the syringe is usually placed inside the automatic sampler and the hydraulic rod can be used to control the lifting and squeezing of the syringe to achieve the effect of automatic injection.

[0003] Chinese Patent Publication No.: CN220419252U discloses "A Gas Chromatography Multi-channel Automatic Injector", which includes a vaporization chamber and a syringe, wherein the side wall of the vaporization chamber is arranged at the carrier gas inlet, a fixed rod is arranged on the top of the vaporization chamber, and a movable sleeve is slidably connected inside the fixed rod, and the syringe is arranged inside the movable sleeve. The fixed rod and the movable sleeve are arranged to protect the needle when the syringe is injected, and reduce the bending caused by the needle accidentally touching the surrounding metal. By arranging a heating mechanism, gas-liquid samples can be injected, and gas-solid samples can also be injected after preheating, which reduces the crystallization caused by the gas-solid sample staying in the syringe for a long time, improves the injection accuracy, and protects the sampling needle. The fixed mechanism can be used for syringes of different sizes, thereby enhancing the flexibility of the injector.

[0004] In the prior art, a heating mechanism can be provided to avoid the problem of crystallization of the internal liquid during use. However, the existing automatic sample injector requires a set of hydraulic rods to control the lifting and lowering of the needle tube, and another set of hydraulic rods to control the needle tube to squeeze and discharge the internal liquid, resulting in increased costs and consumption. Utility Model Content

[0005] The utility model aims to provide a gas chromatography multi-channel automatic sample injector to solve the problem that the existing automatic sample injector in the above background technology needs one group of hydraulic rods to control the lifting and lowering of the needle tube, and another group of hydraulic rods to control the needle tube to squeeze and discharge the internal liquid, which leads to increased cost and consumption.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A gas chromatography multi-channel automatic sample injector comprises a needle tube, an adjustment component is arranged on the back of the outer side of the needle tube, and the adjustment component is used to control the movement of the needle tube and the injection of samples, and a stable limiting component is arranged on the outer side of the needle tube, and the stable limiting component is used to increase the stability of the injection process;

[0008] The adjustment assembly includes a lifting plate, and a piston rod is arranged on the inner side of the lifting plate, a telescopic push rod is arranged on the outer side of the lower end of the piston rod, a supporting spring is arranged on the outer side of the upper end of the piston rod, and a pressing head is installed on the top of the piston rod;

[0009] The stable limiting component comprises a limiting frame, and two groups of engaging grooves are opened at the upper end of the limiting frame. The stable limiting component comprises a combined groove, and the combined groove is located on the inner side of the lower pressure head.

[0010] Preferably, an interlocking disk is installed on both sides of the upper end of the needle tube, and the interlocking disk is located on the inner side of the interlocking groove, a needle is installed at the bottom of the needle tube, and a pull-out piston is provided inside the needle tube, and a combination disk is provided on the top of the pull-out piston, and the combination disk is located on the inner side of the combination groove.

[0011] Preferably, lower guide rods are installed at the bottom of both ends of the lifting plate, and two groups of combined shafts are arranged on the inner side of the lower end of the limiting frame.

[0012] Preferably, upper guide rods are installed at the bottom of both ends of the lower pressure head, and the upper guide rods are located on the inner side of the lifting plate, and an adjustment plate is installed on the outer side of the telescopic push rod.

[0013] Preferably, an adjusting slider is provided on the back side of the lower end of the adjusting plate, and two groups of limiting sliding grooves are respectively provided on the top and bottom of the adjusting slider, and an adjusting screw is provided on the inner side of the adjusting slider.

[0014] Preferably, a limit plate is provided on the inner side of the combined shaft, a heating cylinder is installed at the bottom of the limit plate, and a heating net is provided on the inner side of the heating cylinder.

[0015] Preferably, an adjusting motor is provided at the right end of the adjusting screw, and two sets of combined slide frames are installed on the left side of the adjusting motor, a combined slide groove is opened on the inner side of the combined slide frame, and the combined slide groove is located on the outer side of the adjusting slider, and limiting slide rails are installed on the top and bottom of the inner side of the combined slide groove, and the limiting slide rails are located on the inner side of the limiting slide groove.

[0016] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0017] 1. The utility model is equipped with an adjustment component, and the height of the downward pressure head on the top can be adjusted by using a telescopic push rod to control the piston rod. The height of the entire needle tube can be adjusted at the same time. When the lifting plate is lowered to the top of the adjustment plate, continuous downward pressure will compress the support spring, so that the downward pressure head can be used to push the withdrawal piston to inject the internal liquid into the chromatograph. The height and extrusion can be controlled by a single set of telescopic push rods, which reduces costs and energy consumption.

[0018] 2. The utility model is equipped with a stable limiting component. The existing pull-out piston rod structure cannot effectively limit the movement. When extruding, there is resistance and shaking is likely to occur. The needle tube body and the interlocking disk can be limited by the limit frame and the interlocking groove. At the same time, the combination groove on the top can limit the combination disk. By limiting the combination disk, the pull-out piston can be kept in a vertical state during the extrusion process, thus avoiding the problem of deformation caused by extrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the combined sliding frame structure of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the limit frame of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the heating cylinder of the utility model;

[0023] Figure 5 This is a schematic diagram of the needle tube structure of the utility model.

[0024] Wherein: 1. needle tube; 101. interlocking disk; 103. needle; 104. pull-out piston; 105. combination disk; 2. limit frame; 201. interlocking groove; 202. lifting plate; 203. lower guide rod; 3. lower pressure head; 301. telescopic push rod; 302. piston rod; 303. support spring; 304. upper guide rod; 305. combination groove; 4. adjusting slider; 401. adjusting plate; 402. limit slide groove; 5. heating cylinder; 501. combination shaft; 502. limit plate; 503. heating net; 6. combination slide frame; 601. combination slide groove; 602. limit slide rail; 603. adjusting motor; 604. adjusting screw. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-5 A gas chromatography multi-channel automatic sample injector comprises a needle tube 1, an adjustment component is arranged on the back of the outer side of the needle tube 1, and the adjustment component is used to control the movement of the needle tube 1 and the injection of the sample, and a stable limiting component is arranged on the outer side of the needle tube 1, and the stable limiting component is used to increase the stability of the injection process;

[0027] The adjustment assembly includes a lifting plate 202, and a piston rod 302 is arranged on the inner side of the lifting plate 202, a telescopic push rod 301 is arranged on the outer side of the lower end of the piston rod 302, a support spring 303 is arranged on the outer side of the upper end of the piston rod 302, and a pressing head 3 is installed on the top of the piston rod 302;

[0028] The stabilizing and limiting assembly includes a limiting frame 2 , and two sets of engaging grooves 201 are formed at the upper end of the limiting frame 2 . The stabilizing and limiting assembly includes a combined groove 305 , and the combined groove 305 is located at the inner side of the lower pressing head 3 .

[0029] Through the above technical solution, the telescopic push rod 301 can be used to control the top pressure head 3 through the piston rod 302 to adjust the height. At the same time, the height of the needle tube 1 as a whole can be adjusted. When the lifting plate 202 is lowered to the top of the adjustment plate 401, continuous downward pressure will compress the support spring 303, so that the pressure head 3 can be used to push the withdrawal piston 104 to inject the internal liquid into the chromatograph. The height and extrusion can be controlled by a single set of telescopic push rods 301, which reduces costs and energy consumption.

[0030] Through the above technical solution, the needle tube 1 body and the interlocking disk 101 can be restricted by the limit frame 2 and the interlocking groove 201, and the combination groove 305 on the top can restrict the combination disk 105. By restricting the combination disk 105, the pulling piston 104 can be kept in a vertical state during the extrusion process, avoiding the problem of deformation caused by extrusion.

[0031] Specifically, an interlocking disk 101 is installed on both sides of the upper end of the needle tube 1, and the interlocking disk 101 is located on the inner side of the interlocking groove 201, a needle 103 is installed at the bottom of the needle tube 1, and a pull-out piston 104 is provided inside the needle tube 1, and a combination disk 105 is provided on the top of the pull-out piston 104, and the combination disk 105 is located on the inner side of the combination groove 305.

[0032] Through the above technical solution, the interlocking disk 101 can be combined with the interlocking groove 201, so as to increase the stability of the splicing. The needle 103 can be inserted into the chromatograph and the internal liquid can be injected into the interior by pulling out the piston 104, and the combination disk 105 can be embedded in the inner side of the combination groove 305.

[0033] Specifically, lower guide rods 203 are installed at the bottom of both ends of the lifting plate 202, and two groups of combined shafts 501 are arranged on the inner side of the lower end of the limiting frame 2.

[0034] Through the above technical solution, the lower guide rod 203 can increase the stability of the adjustment of the lifting plate 202.

[0035] Specifically, upper guide rods 304 are installed at the bottom of both ends of the lower pressure head 3 , and the upper guide rods 304 are located on the inner side of the lifting plate 202 , and an adjustment plate 401 is installed on the outer side of the telescopic push rod 301 .

[0036] Through the above technical solution, the upper guide rod 304 can increase the stability of the lower pressure head 3.

[0037] Specifically, an adjusting slider 4 is disposed on the back of the lower end of the adjusting plate 401 , and two groups of limiting sliding grooves 402 are respectively provided on the top and bottom of the adjusting slider 4 , and an adjusting screw 604 is disposed on the inner side of the adjusting slider 4 .

[0038] Through the above technical solution, the adjustment plate 401 can provide restrictions for the inner telescopic push rod 301, and the limiting slide groove 402 can increase the stability of the adjustment of the adjustment slider 4.

[0039] Specifically, a limiting plate 502 is disposed on the inner side of the combined shaft 501 , and a heating cylinder 5 is installed on the bottom of the limiting plate 502 , and a heating net 503 is disposed on the inner side of the heating cylinder 5 .

[0040] Through the above technical solution, the limiting plate 502 can be adjusted to a certain angle in cooperation with the combined shaft 501, and the heating net 503 inside the heating tube 5 can be used to heat the liquid inside the needle tube 1.

[0041] Specifically, an adjusting motor 603 is provided at the right end of the adjusting screw 604, and two sets of combined slide frames 6 are installed on the left side of the adjusting motor 603. A combined slide groove 601 is opened on the inner side of the combined slide frame 6, and the combined slide groove 601 is located on the outer side of the adjusting slider 4. A limiting slide rail 602 is installed on the top and bottom of the inner side of the combined slide groove 601, and the limiting slide rail 602 is located on the inner side of the limiting slide groove 402.

[0042] Through the above technical solution, the adjustment motor 603 can control the adjustment screw 604 to rotate, and the control adjustment slider 4 can slide along the inner side of the combined slide groove 601, and the limiting slide rail 602 can increase the stability of the sliding adjustment.

[0043] When in use, first place the needle tube 1 directly on the inner side of the limit frame 2, then set the combination disk 105 on the inner side of the combination groove 305, adjust the position of the needle tube 1, and then control the adjusting screw 604 to rotate under the action of the adjusting motor 603, so as to control the adjusting slider 4 to slide along the inner side of the combination slide groove 601, and then use the telescopic push rod 301 to control the contraction of the piston rod 302. During the contraction process, the lifting plate 202 will be driven to adjust the height. When reaching the end, the top pressure head 3 will compress the support spring 303 and push the combination disk 105, and the internal liquid can be injected into the chromatograph by pulling out the piston 104.

[0044] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit thereof, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas chromatography multi-channel automatic sample injector, comprising a needle tube (1), characterized in that: An adjustment component is arranged on the back side of the outer side of the needle tube (1), and the adjustment component is used to control the movement of the needle tube (1) and the injection of the sample. A stabilization and restriction component is arranged on the outer side of the needle tube (1), and the stabilization and restriction component is used to increase the stability of the injection process. The adjustment assembly comprises a lifting plate (202), wherein a piston rod (302) is arranged on the inner side of the lifting plate (202), a telescopic push rod (301) is arranged on the outer side of the lower end of the piston rod (302), a supporting spring (303) is arranged on the outer side of the upper end of the piston rod (302), and a pressing head (3) is installed on the top of the piston rod (302); The stabilizing and limiting component comprises a limiting frame (2), and two groups of engaging grooves (201) are provided at the upper end of the limiting frame (2). The stabilizing and limiting component comprises a combined groove (305), and the combined groove (305) is located on the inner side of the lower pressure head (3).

2. A gas chromatography multi-channel automatic sample injector according to claim 1, characterized in that: The needle tube (1) has engaging disks (101) installed on both sides of the upper end thereof, and the engaging disks (101) are located inside the engaging groove (201); the needle head (103) is installed at the bottom of the needle tube (1), and a pull-out piston (104) is arranged inside the needle tube (1); a combination disk (105) is arranged on the top of the pull-out piston (104), and the combination disk (105) is located inside the combination groove (305).

3. A gas chromatography multi-channel automatic sample injector according to claim 1, characterized in that: Lower guide rods (203) are installed at the bottom of both ends of the lifting plate (202), and two groups of combined shafts (501) are arranged on the inner side of the lower end of the limiting frame (2).

4. A gas chromatography multi-channel automatic sample injector according to claim 1, characterized in that: Upper guide rods (304) are installed at the bottom of both ends of the lower pressure head (3), and the upper guide rods (304) are located on the inner side of the lifting plate (202). An adjustment plate (401) is installed on the outer side of the telescopic push rod (301).

5. A gas chromatography multi-channel automatic sample injector according to claim 4, characterized in that: An adjusting slider (4) is arranged on the back side of the lower end of the adjusting plate (401), and two groups of limiting sliding grooves (402) are respectively provided on the top and bottom of the adjusting slider (4), and an adjusting screw (604) is arranged on the inner side of the adjusting slider (4).

6. A gas chromatography multi-channel automatic sample injector according to claim 3, characterized in that: A limiting plate (502) is arranged on the inner side of the combined shaft (501), a heating cylinder (5) is installed on the bottom of the limiting plate (502), and a heating net (503) is arranged on the inner side of the heating cylinder (5).

7. A gas chromatography multi-channel automatic sample injector according to claim 5, characterized in that: An adjusting motor (603) is arranged at the right end of the adjusting screw rod (604), and two groups of combined slide frames (6) are installed on the left side of the adjusting motor (603), a combined slide groove (601) is opened on the inner side of the combined slide frame (6), and the combined slide groove (601) is located on the outer side of the adjusting slider (4), and limiting slide rails (602) are installed on the top and bottom of the inner side of the combined slide groove (601), and the limiting slide rails (602) are located on the inner side of the limiting slide groove (402).

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