Headspace sample injector preheating structure

Abstract

The utility model discloses a headspace sample injector preheating structure which comprises a bottom plate and a guide rail fixed on the bottom plate, a heating box is arranged on the guide rail in a sliding mode, a heating cavity is formed in the heating box, a heating coil pipe is fixedly installed in the heating cavity, a plurality of heating hole positions are formed in the top of the heating box, and the heating coil pipe is fixedly installed in the heating cavity. A plurality of heating holes are formed in the bottom plate, the heating cavity is located below the heating holes, a sliding block is fixedly connected to the bottom of the heating box, a positioning block is fixedly connected to the lower end of the sliding block, a sliding opening is formed in the bottom plate, and a reset spring is fixedly connected between the sliding block and the inner wall of the sliding opening. The long end of the cam pushes the positioning block to move linearly, the positioning block drives the heating box to move linearly through the sliding block, when the long end of the cam is far away from the positioning block, the reset spring releases elastic force and pushes the sliding block to reset, resetting of the heating box is achieved, and finally the purposes of oscillation of the headspace bottle in the heating hole position and uniform heating are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of head space samplers, in particular to a preheating structure of a head space sampler. Background Art

[0002] The headspace sampler is a convenient and fast sample pretreatment method in gas chromatography. Its principle is to place the sample to be tested in a closed container, heat it to make the volatile components evaporate from the sample matrix, reach equilibrium in the gas-liquid (or gas-solid) phase, and directly extract the top gas for chromatographic analysis to test the composition and content of the volatile components in the sample; the preheating structure of the headspace sampler mainly refers to adding a heating device inside the headspace sampler to heat the sample. This structure can be used in equipment such as gas chromatographs to improve the injection efficiency and separation effect of volatile substances in the sample.

[0003] The preheating structure of the existing headspace sampler is fixed and cannot be moved, so it cannot oscillate, resulting in uneven heating, which may affect the heating and volatilization of the sample. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a head space sampler preheating structure, which solves the problems raised in the above background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: a head space sampler preheating structure, comprising a base plate and a guide rail fixed on the base plate, a heating box is slidably arranged on the guide rail, a heating chamber is provided in the heating box, a heating coil is fixedly installed inside the heating chamber, a plurality of heating holes are provided on the top of the heating box, the heating chamber is located below the plurality of heating holes, a slider is fixedly connected to the bottom of the heating box, a positioning block is fixedly connected to the lower end of the slider, a sliding opening is provided on the base plate, a reset spring is fixedly connected between the slider and the inner wall of the sliding opening, and the heating box can be reciprocated and linearly moved by intermittently applying external force to the positioning block, so as to facilitate the oscillation of the head space bottle and promote the heating effect.

[0008] Preferably, a driving assembly is provided at the bottom of the base plate, and the driving assembly includes a bracket fixed to the bottom of the base plate, a rotating shaft rotatably inserted on the bracket, a cam fixed to one end of the rotating shaft, and a driven gear fixed to the other end of the rotating shaft, and the cam is in contact with the positioning block.

[0009] Preferably, a motor is fixedly mounted on the bottom of the base plate, a driving gear is fixedly connected to the output end of the motor, and the driving gear is meshed with a driven gear.

[0010] Preferably, a clamping plate is provided inside the heating hole, and an elastic telescopic rod is fixedly connected between the clamping plate and the inner wall of the heating hole.

[0011] Preferably, the elastic telescopic rod includes a fixed sleeve fixed to the inner wall of the heating hole, and a push rod movably inserted inside the fixed sleeve, one end of the push rod is fixedly connected to the clamping plate, and a clamping spring is fixedly connected between the push rod and the inner wall of the fixed sleeve.

[0012] (III) Beneficial effects

[0013] The utility model provides a head space sampler preheating structure, which has the following beneficial effects:

[0014] 1. In the utility model, the motor is started to drive the driving gear to rotate, the driving gear drives the driven gear to rotate, the driven gear drives the cam to rotate through the rotating shaft, the long end of the cam pushes the positioning block to move linearly, the positioning block drives the heating box to move linearly through the slider, when the long end of the cam is away from the positioning block, the reset spring releases the elastic force, pushes the slider to reset, and realizes the reset of the heating box, and finally realizes the oscillation of the empty bottle in the heating hole, and realizes the purpose of uniform heating.

[0015] 2. In the utility model, the headspace bottle is placed in the heating hole, and under the action of the elastic telescopic rod, the clamping plate and the headspace bottle are in contact with each other to achieve the purpose of clamping and fixing, so that adaptive compensation can be performed according to the size of the headspace bottle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front-view stereoscopic structural diagram of a head space sampler preheating structure proposed by the utility model;

[0017] Figure 2 for Figure 1 A magnified structural diagram;

[0018] Figure 3 This is a structural diagram of an elastic telescopic rod of a head space sampler preheating structure proposed by the utility model;

[0019] Figure 4 This is a bottom view of a preheating structure of a head space sampler proposed by the utility model;

[0020] Figure 5 for Figure 4 The enlarged structure diagram at B;

[0021] Figure 6 The utility model provides a cross-sectional structural diagram of a head space sampler preheating structure.

[0022] In the figure: 1, bottom plate; 101, slide; 2, heating box; 201, heating hole; 3, guide rail; 4, elastic telescopic rod; 41, fixing sleeve; 42, clamping spring; 43, push rod; 5, clamping plate; 6, slider; 7, positioning block; 8, driving assembly; 81, bracket; 82, cam; 83, driven gear; 84, rotating shaft; 9, driving gear; 10, motor; 11, reset spring; 12, heating coil. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] See also Figures 1 to 6 The utility model provides a technical solution: a head space sampler preheating structure, comprising a bottom plate 1, a guide rail 3 fixed on the bottom plate 1, a heating box 2 is slidably arranged on the guide rail 3, a heating chamber is provided in the heating box 2, a heating coil 12 is fixedly installed inside the heating chamber, a plurality of heating holes 201 are provided on the top of the heating box 2, the heating chamber is located below the plurality of heating holes 201, the head space bottle inside the heating hole 201 can be heated by opening the heating coil 12, a slider 6 is fixedly connected to the bottom of the heating box 2, a positioning block 7 is fixedly connected to the lower end of the slider 6, a sliding opening 101 is provided on the bottom plate 1, a reset spring 11 is fixedly connected between the slider 6 and the inner wall of the sliding opening 101, and the heating box 2 can be reciprocated and linearly moved by intermittently applying external force to the positioning block 7, so that the head space bottle can be oscillated conveniently and the heating effect is promoted.

[0025] In this embodiment, a driving assembly 8 is provided at the bottom of the base plate 1, and the driving assembly 8 includes a bracket 81 fixed to the bottom of the base plate 1, a rotating shaft 84 rotatably inserted on the bracket 81, a cam 82 fixed to one end of the rotating shaft 84, and a driven gear 83 fixed to the other end of the rotating shaft 84, and the cam 82 is in contact with the positioning block 7.

[0026] A motor 10 is fixedly installed at the bottom of the base plate 1 , and a driving gear 9 is fixedly connected to the output end of the motor 10 . The driving gear 9 is meshed with the driven gear 83 .

[0027] Start the motor 10 to drive the driving gear 9 to rotate, the driving gear 9 drives the driven gear 83 to rotate, the driven gear 83 drives the cam 82 to rotate through the rotating shaft 84, the long end of the cam 82 pushes the positioning block 7 to move linearly, the positioning block 7 drives the heating box 2 to move linearly through the slider 6, when the long end of the cam 82 is away from the positioning block 7, the reset spring 11 releases its elastic force, pushes the slider 6 to reset, and the heating box 2 is reset, and finally the oscillation of the empty bottle in the heating hole 201 is realized, so as to achieve the purpose of uniform heating.

[0028] A clamping plate 5 is provided inside the heating hole 201 , and an elastic telescopic rod 4 is fixedly connected between the clamping plate 5 and the inner wall of the heating hole 201 .

[0029] The headspace bottle is placed in the heating hole 201 , and under the action of the elastic telescopic rod 4 , the clamping plate 5 is in contact with the headspace bottle to achieve the purpose of clamping and fixing, so that adaptive compensation can be performed according to the size of the headspace bottle.

[0030] Specifically, the elastic telescopic rod 4 includes a fixed sleeve 41 fixed to the inner wall of the heating hole 201, a push rod 43 movably inserted inside the fixed sleeve 41, one end of the push rod 43 is fixedly connected to the clamping plate 5, and a clamping spring 42 is fixedly connected between the push rod 43 and the inner wall of the fixed sleeve 41.

[0031] When the headspace bottle is inserted into the heating hole 201 , the clamping spring 42 is in a compressed state, exerting a force toward the headspace bottle on the push rod 43 and the clamping plate 5 , so that the clamping plate 5 presses the headspace bottle.

[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A head space sampler preheating structure, characterized in that: The invention comprises a bottom plate (1) and a guide rail (3) fixed on the bottom plate (1); a heating box (2) is slidably arranged on the guide rail (3); a heating chamber is provided in the heating box (2); a heating coil (12) is fixedly installed inside the heating chamber; a plurality of heating holes (201) are provided on the top of the heating box (2); the heating chamber is located below the plurality of heating holes (201); a slider (6) is fixedly connected to the bottom of the heating box (2); a positioning block (7) is fixedly connected to the lower end of the slider (6); a sliding opening (101) is provided on the bottom plate (1); a return spring (11) is fixedly connected between the slider (6) and the inner wall of the sliding opening (101); and by intermittently applying external force to the positioning block (7), the heating box (2) can move back and forth in a straight line, which facilitates the oscillation of the headspace bottle and promotes the heating effect.

2. A head space sampler preheating structure according to claim 1, characterized in that: A driving assembly (8) is provided at the bottom of the base plate (1), and the driving assembly (8) comprises a bracket (81) fixed to the bottom of the base plate (1), a rotating shaft (84) rotatably inserted on the bracket (81), a cam (82) fixed to one end of the rotating shaft (84), and a driven gear (83) fixed to the other end of the rotating shaft (84), wherein the cam (82) is in contact with the positioning block (7).

3. A head space sampler preheating structure according to claim 2, characterized in that: A motor (10) is fixedly mounted on the bottom of the base plate (1), a driving gear (9) is fixedly connected to the output end of the motor (10), and the driving gear (9) is meshed with a driven gear (83).

4. A head space sampler preheating structure according to claim 1, characterized in that: A clamping plate (5) is provided inside the heating hole (201), and an elastic telescopic rod (4) is fixedly connected between the clamping plate (5) and the inner wall of the heating hole (201).

5. A head space sampler preheating structure according to claim 4, characterized in that: The elastic telescopic rod (4) comprises a fixing sleeve (41) fixed to the inner wall of the heating hole (201), and a push rod (43) movably inserted into the fixing sleeve (41); one end of the push rod (43) is fixedly connected to the clamping plate (5); and a clamping spring (42) is fixedly connected between the push rod (43) and the inner wall of the fixing sleeve (41).

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