Solid-phase extraction equipment for food detection

Abstract

The utility model discloses solid-phase extraction equipment for food detection, a clamping mechanism comprises a pull handle, the bottom of the pull handle is fixedly connected with a lifting rod, the bottom of the lifting rod is fixedly connected with a clamping sleeve, the upper end of the outer wall of the clamping sleeve is symmetrically provided with limiting grooves, and the limiting grooves are fixedly connected with the lifting rod. An extrusion block is connected to the outer wall of the clamping sleeve and located below the limiting grooves in a penetrating mode, a spring is fixedly connected to one end of the side edge of the extrusion block, the other end of the spring is fixedly connected with the outer wall of the clamping sleeve, and a gasket is fixedly connected to the side, close to the clamping sleeve, of the outer wall of the extrusion block; the lifting rod at the top of the clamping sleeve can only ascend and descend in the linear direction under the constraint of the top plate, so that after the extraction head is fixed by the clamping sleeve, the lifting rod is pulled upwards to ensure that the extraction head is vertically and upwards pulled out, and the extraction limiting damage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of food detection, in particular to a solid phase extraction device for food detection. Background Art

[0002] Headspace solid-phase microextraction (SPME) is a novel sample pretreatment technique that combines the advantages of headspace and solid-phase microextraction (SPME). This method places the SPME material in a headspace vial, and the sample to be tested is also added to the headspace vial. Through headspace technology, volatile or semi-volatile organic compounds in the sample evaporate into the headspace vial and are subsequently adsorbed and enriched by the SPME material. Finally, the enriched target compounds are eluted for analysis.

[0003] The extraction heads commonly used in food testing are designed to be longer in order to accommodate the extraction limiter. When the extraction limiter at the top of the extraction head is inserted into the headspace bottle, a longer area extends into the external environment, making it susceptible to external environmental influences such as vibration or airflow, resulting in unstable insertion. Moreover, when the extraction head is pulled out, if the pull-out angle is offset, the extraction fiber may be subjected to excessive mechanical stress, thereby increasing the risk of damage. Therefore, a solid-phase extraction device for food testing is proposed to solve the above problems. Utility Model Content

[0004] The technical problems to be solved by the present invention are as follows: it is easily affected by the external environment, such as vibration or airflow, which may lead to unstable insertion; when the extraction head is pulled out, if the pulling-out angle is offset, the extraction fiber may be subjected to excessive mechanical stress, thereby increasing the risk of damage.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A solid phase extraction device for food testing, comprising a limiting mechanism, a clamping mechanism disposed above the limiting mechanism, the limiting mechanism comprising a water bath, and the clamping mechanism comprising an extraction head;

[0007] Also includes:

[0008] The clamping mechanism includes a pulling handle, a lifting rod is fixedly connected to the bottom of the pulling handle, a clamping sleeve is fixedly connected to the bottom of the lifting rod, and the upper end of the outer wall of the clamping sleeve is symmetrically provided with limiting grooves, and an extrusion block is connected to the outer wall of the clamping sleeve below each limiting groove;

[0009] Wherein, one end of the side of the extrusion block is fixedly connected to a spring, and the other end of the spring is fixedly connected to the outer wall of the clamping sleeve;

[0010] A gasket is fixedly connected to the side of the outer wall of the extrusion block close to the clamping sleeve, and a slope is provided on the side of the extrusion block away from the gasket. The slope of the extrusion block extends from top to bottom toward the outside of the clamping sleeve.

[0011] As a further solution of the present invention: the lower end of the outer wall of the lifting rod is provided with an external thread, the outer thread of the external thread is sleeved with a rotating ring, the bottom surface of the rotating ring is provided with an annular groove, and the inner side of the annular groove is symmetrically rotatably connected to the extrusion rod.

[0012] As a further solution of the present invention: the outer walls of the two extrusion rods and one side close to the clamping sleeve are fixedly connected to a limiting shaft, the outer wall of the limiting shaft is slidably connected along the limiting groove, the bottom end of the extrusion rod is set to an arc shape, and the outer wall of the bottom end of the extrusion rod is against the inclined side of the extrusion block.

[0013] As a further solution of the present invention: the inner side of the clamping sleeve is plugged into the extraction head, the front side of the clamping sleeve is provided with an operating port, the operating port is consistent with the length direction of the extraction head, and the surface of the gasket is against the extraction head.

[0014] As a further solution of the present invention: the limiting mechanism includes a base plate, both sides of the outer wall of the base plate are fixedly connected to extension plates, the top of the extension plate is fixedly connected to a storage tube, the upper end of the outer wall of the storage tube is threadedly connected to a push rod, one end of the push rod passes through the storage tube and is fixedly connected to a knob, the inner wall of the storage tube is sleeved with a telescopic rod, the outer wall of the telescopic rod is abutted against the push rod, the top ends of the two telescopic rods extend to the top of the storage tube and are commonly fixedly connected to a top plate, and the inner wall of the top plate is connected through with several lifting rods.

[0015] As a further solution of the present invention: positioning rails are provided on both sides of the top surface of the bottom plate, the inner walls of the positioning rails are slidably connected with positioning blocks, the tops of the positioning blocks are fixedly connected to the water bath, and a top frame is fixedly installed on the top surface of the water bath.

[0016] As a further solution of the present invention: a plurality of insertion holes are provided on the surface of the top frame, a top space bottle is inserted into the inner wall of the insertion hole, and the top of the top space bottle is inserted into the extraction head.

[0017] Beneficial effects of the utility model:

[0018] (1) The utility model provides a clamping mechanism above the headspace bottle, wherein the clamping sleeve inside the clamping mechanism is installed on the outside of the extraction head, and the extrusion block inside the clamping sleeve presses against the side of the extraction head. An operating port is provided on the surface of the clamping sleeve, thereby facilitating the adjustment and extension of the extraction fiber inside the extraction head. The lifting rod on the top of the clamping sleeve can only be lifted and lowered in a straight line under the constraint of the top plate. After the clamping sleeve fixes the extraction head, the lifting rod is pulled up to ensure that the extraction head is pulled out vertically upward, thereby avoiding damage to the extraction limit.

[0019] (2) Telescopic rods are fixed on both sides of the top plate. The telescopic rods can move vertically along the storage tube on the bottom plate, thereby driving the telescopic rods to lift up as a whole. When the extraction head is fixed by multiple clamping sleeves under the top plate, the extraction head is controlled to separate from the top space bottle at the same time, which is beneficial to improving efficiency and allows the extraction fiber to be inserted into the gas chromatograph in time for the next step of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the overall external structure of the clamping sleeve in the utility model;

[0023] Figure 3 This is a schematic diagram of the internal structure of the clamping sleeve in the utility model;

[0024] Figure 4 This is a schematic diagram of the top frame of the utility model from a top view;

[0025] Figure 5 It is a schematic diagram of the internal structure of the push rod in the utility model.

[0026] In the figure: 1. Limiting mechanism; 101. Bottom plate; 102. Positioning rail; 103. Extension plate; 104. Storage tube; 105. Knob; 106. Push rod; 107. Telescopic rod; 108. Top plate; 109. Water bath; 110. Positioning rail; 111. Top frame; 112. Socket; 113. Top empty bottle; 2. Clamping mechanism; 201. Pull handle; 202. Lifting rod; 203. External thread; 204. Rotating ring; 205. Annular slide; 206. Extrusion rod; 207. Limiting shaft; 208. Clamping sleeve; 209. Limiting groove; 210. Operating port; 211. Extrusion block; 212. Spring; 213. Gasket; 214. Extraction head. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0028] like Figure 1-5 As shown, a solid phase extraction device for food testing includes a limiting mechanism 1, a clamping mechanism 2 is provided above the limiting mechanism 1, the limiting mechanism 1 includes a water bath 109, and the clamping mechanism 2 includes an extraction head 214; the clamping mechanism 2 also includes: a pulling handle 201, a lifting rod 202 is fixedly connected to the bottom of the pulling handle 201, a clamping sleeve 208 is fixedly connected to the bottom of the lifting rod 202, and a limiting groove 209 is symmetrically provided on the upper end of the outer wall of the clamping sleeve 208. The outer wall of the extrusion block 211 is connected to the lower part of each limiting groove 209; wherein, one end of the side of the extrusion block 211 is fixedly connected to a spring 212, and the other end of the spring 212 is fixedly connected to the outer wall of the clamping sleeve 208; wherein, the outer wall of the extrusion block 211 is fixedly connected to a gasket 213 on the side close to the clamping sleeve 208, and the extrusion block 211 is provided with an inclined surface on the side away from the gasket 213, and the inclined surface of the extrusion block 211 extends from top to bottom toward the outside of the clamping sleeve 208, such as Figure 3 As shown, the gasket 213 is made of silicone. When the extrusion block 211 approaches the extraction head, the gasket 213 provides a buffer to prevent the surface of the extraction head from being damaged.

[0029] The lower end of the outer wall of the lifting rod 202 is provided with an external thread 203, and the outer thread sleeve of the external thread 203 is provided with a rotating ring 204. The bottom surface of the rotating ring 204 is provided with an annular groove 205. The inner side of the annular groove 205 is symmetrically connected to the extrusion rod 206 for rotation. The outer wall of the two extrusion rods 206 and one side close to the clamping sleeve 208 are fixedly connected to the limiting shaft 207. The outer wall of the limiting shaft 207 is slidably connected along the limiting groove 209. The bottom end of the extrusion rod 206 is set to an arc shape, and the outer wall of the bottom end of the extrusion rod 206 is against the inclined side of the extrusion block 211. Figure 2-Figure 3 As shown, when the extrusion rod 206 descends, the inclined surface of the extrusion block 211 is subjected to pressure, thereby generating a force toward the inner side of the clamping sleeve 208;

[0030] The inner side of the clamping sleeve 208 is plugged into the extraction head 214. The front of the clamping sleeve 208 is provided with an operation port 210. The operation port 210 is consistent with the length direction of the extraction head 214. The surface of the gasket 213 is against the extraction head 214. Figure 2As shown, when the extraction head 214 is inserted into the clamping sleeve 208, the accessories of the extraction head that control the extraction limit extension are exposed to the external environment through the operating port 210, which is convenient for the operator to control;

[0031] The limiting mechanism 1 includes a base plate 101, and both sides of the outer wall of the base plate 101 are fixedly connected to extension plates 103, and the top of the extension plate 103 is fixedly connected to a storage tube 104. The upper end of the outer wall of the storage tube 104 is threadedly connected to a push rod 106, and one end of the push rod 106 passes through the storage tube 104 and is fixedly connected to a knob 105. The inner wall of the storage tube 104 is sleeved with a telescopic rod 107, and the outer wall of the telescopic rod 107 is against the push rod 106. The top ends of the two telescopic rods 107 extend to the top of the storage tube 104 and are fixedly connected together. A top plate 108 is connected, and the inner wall of the top plate 108 is connected with a plurality of lifting rods 202. Positioning rails 102 are provided on both sides of the top surface of the bottom plate 101. The inner wall of the positioning rail 102 is slidably connected with a positioning block 110. The top of the positioning block 110 is fixedly connected to the water bath 109. The top surface of the water bath 109 is fixedly installed with a top frame 111. The surface of the top frame 111 is provided with a plurality of sockets 112. The inner wall of the socket 112 is plugged with a top empty bottle 113. The top of the top empty bottle 113 is plugged with the extraction head 214. Figure 1 As shown, the water bath 109 moves along the positioning rail 102 through the positioning block 110 , so that the water bath 109 is separated from the bottom plate 101 , thereby facilitating the taking and placing of each headspace bottle 113 .

[0032] The working principle of this utility model:

[0033] When the device is in use, the pulling handle 201 is lifted up, and then the extraction head 214 is inserted into the clamping sleeve 208. At this time, the rotating ring 204 is twisted. Under the pressure of the external thread 203, the rotating ring 204 descends along the lifting rod 202, and the extrusion rod 205 pushes the outer inclined surface of the extrusion block 211 downward. The extrusion block 211 moves toward the inside of the clamping sleeve 208 and clamps the side of the extraction head with the gasket 213. Then, the pulling handle 201 is slowly reset downward, and the extraction head 214 is vertically inserted into the head space bottle 113. Then, the extraction limiter inside the extraction head 214 is controlled to descend to the inside of the head space bottle 113 through the operation port 210, so that the volatile components are fully adsorbed on the extraction head;

[0034] Secondly, when multiple extraction heads 214 are installed inside the clamping sleeve 208, the knob 105 is turned to loosen the push rod 106, and then the top plate 108 is pushed upward, and the telescopic rod 107 rises along the storage tube 104, so that the top plate 108 drives each lifting rod 202 to rise at the same time, and the extraction heads 214 inside each clamping sleeve 208 are separated from the headspace bottle 113.

[0035] The above describes an embodiment of the present invention in detail. However, the above content is only a preferred embodiment of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent application of the present invention.

Claims

1. A solid phase extraction device for food testing, comprising a limiting mechanism (1), a clamping mechanism (2) being provided above the limiting mechanism (1), the limiting mechanism (1) comprising a water bath (109), and the clamping mechanism (2) comprising an extraction head (214); It is characterized by: Also includes: The clamping mechanism (2) comprises a pulling handle (201), the bottom of the pulling handle (201) is fixedly connected to a lifting rod (202), the bottom of the lifting rod (202) is fixedly connected to a clamping sleeve (208), the upper end of the outer wall of the clamping sleeve (208) is symmetrically provided with limiting grooves (209), and the outer wall of the clamping sleeve (208) is located below each limiting groove (209) and is connected to an extrusion block (211); One end of the side of the extrusion block (211) is fixedly connected to a spring (212), and the other end of the spring (212) is fixedly connected to the outer wall of the clamping sleeve (208); A gasket (213) is fixedly connected to the side of the outer wall of the extrusion block (211) close to the clamping sleeve (208), and an inclined surface is provided on the side of the extrusion block (211) away from the gasket (213), and the inclined surface of the extrusion block (211) extends from top to bottom toward the outside of the clamping sleeve (208).

2. The solid phase extraction device for food testing according to claim 1, characterized in that: The lower end of the outer wall of the lifting rod (202) is provided with an external thread (203), the outer thread of the external thread (203) is provided with a rotating ring (204), the bottom surface of the rotating ring (204) is provided with an annular sliding groove (205), and the inner side of the annular sliding groove (205) is symmetrically connected to the extrusion rod (206).

3. The solid phase extraction device for food testing according to claim 2, characterized in that: A limiting shaft (207) is fixedly connected to the outer walls of the two extrusion rods (206) and one side close to the clamping sleeve (208), and the outer wall of the limiting shaft (207) is slidably connected along the limiting groove (209). The bottom end of the extrusion rod (206) is set to be arc-shaped, and the outer wall of the bottom end of the extrusion rod (206) is against the inclined side of the extrusion block (211).

4. The solid phase extraction device for food testing according to claim 3, characterized in that: The inner side of the clamping sleeve (208) is plugged into the extraction head (214), and an operating port (210) is provided on the front of the clamping sleeve (208). The operating port (210) is consistent with the length direction of the extraction head (214), and the surface of the gasket (213) is against the extraction head (214).

5. The solid phase extraction device for food testing according to claim 1, characterized in that: The limiting mechanism (1) comprises a bottom plate (101), both sides of the outer wall of the bottom plate (101) are fixedly connected with extension plates (103), the top of the extension plate (103) is fixedly connected with a storage tube (104), the upper end of the outer wall of the storage tube (104) is threadedly connected with a push rod (106), one end of the push rod (106) passes through the storage tube (104) and is fixedly connected with a knob (105), the inner wall of the storage tube (104) is sleeved with a telescopic rod (107), the outer wall of the telescopic rod (107) is against the push rod (106), the top ends of the two telescopic rods (107) extend to the top of the storage tube (104) and are fixedly connected with a top plate (108), and the inner wall of the top plate (108) is connected with a plurality of lifting rods (202).

6. The solid phase extraction device for food testing according to claim 5, characterized in that: Positioning rails (102) are provided on both sides of the top surface of the bottom plate (101), and the inner wall of the positioning rail (102) is slidably connected to a positioning block (110), the top of the positioning block (110) is fixedly connected to the water bath (109), and the top surface of the water bath (109) is fixedly installed with a top frame (111).

7. The solid phase extraction device for food testing according to claim 6, characterized in that: A plurality of insertion holes (112) are provided on the surface of the top frame (111), and a top space bottle (113) is inserted into the inner wall of the insertion hole (112), and the top of the top space bottle (113) is inserted into the extraction head (214).

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