CN110624435A

CN110624435A - Hand-held homogenizer

Info

Publication number: CN110624435A
Application number: CN201910910236.1A
Authority: CN
Inventors: 刘忠; 李玉源; 袁莉莉
Original assignee: Shandong Yijian Biotechnology Co Ltd; Shandong Industrial Technology Research Institute of ZJU
Current assignee: Shandong Yijian Biotechnology Co Ltd; Shandong Industrial Technology Research Institute of ZJU
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2019-12-31

Abstract

The invention discloses a handheld homogenizer, which comprises a stirring rod, a sampling pipe frame and a handheld electric piece, wherein the stirring rod is connected with the sampling pipe frame through a connecting rod; handheld electric part and the detachable connection of puddler, the puddler comprises stopper, stirring leaf and (mixing) shaft, is provided with stirring leaf and stopper on the (mixing) shaft, and sampling pipe is sealed to the stopper, is equipped with the limit structure of restriction sampling pipe rotation between sampling pipe and the sampling pipe support. The puddler and the sampling pipe of hand-held type homogenizer are disposable aseptic consumptive material, and operating personnel can step by step realize accomodating, homogeneity and the cultivation of sample, need not to turn to and handle the sample in special homogenizer, also need not to transfer the sample after handling to the blake bottle and cultivates.

Description

Hand-held homogenizer

Technical Field

The invention relates to the field of homogenizers, in particular to a handheld homogenizer.

Background

The homogenizer is mainly applied to tissue dispersion in the field of biotechnology and medicine mixing in the field of medicine, when biological sample detection is carried out, animal tissues or plant tissues are dispersed through the homogenizer, so that the purposes of separation, uniform mixing, crushing and homogenization of the animal tissues or the plant tissues are achieved, nucleic acid and protein are extracted by matching with a lysis solution, and the detection of the biological sample is finally completed; the homogenizer is also applied to the even mixing of medical drug solvent, improves the dissolving capacity of drug solvent, reaches the ultra-fine dispersion and the emulsification of drug solvent to the realization is to the quick abundant and even mixture of drug solvent.

The existing homogenizer adopts a rotary blade to rotate in the homogenizer, the rotary blade is driven by a motor rotor to rotate stably at a high speed, a high-frequency circumferential tangential velocity and an angular velocity are formed, materials are subjected to shearing, friction, centrifugal extrusion and liquid flow collision effects which are circularly reciprocated in a container, and therefore the purpose of uniformly mixing and homogenizing is achieved.

Disclosure of Invention

The invention aims to provide a handheld homogenizer, so that the homogenizer is light and flexible, the operation is simple and efficient, and the cross contamination of samples can be avoided.

A hand-held homogenizer comprises a stirring rod, a sampling tube rack and a hand-held electric moving part; handheld electric part and the detachable connection of puddler, the puddler comprises stopper, stirring leaf and (mixing) shaft, is provided with stirring leaf and stopper on the (mixing) shaft, on the sampling pipe is sealed to the stopper, is equipped with the limit structure of restriction sampling pipe rotation between sampling pipe and the sampling pipe support.

Further, handheld electric component comprises connecting portion, handle and motor, and the handle is hollow cylinder, and the one end and the connecting portion of handle are fixed, and the motor is located the inside of connecting portion and handle, and the inside of handle is provided with the battery, and one side of handle is provided with the on & off switch, and the on & off switch links to each other with the motor, and connecting portion are provided with the button and connect the clamping jaw, and the connection clamping jaw contains the stationary dog.

The inside of the hand-held electric piece is provided with a rechargeable battery, so that a power supply is provided for the motor, when the hand-held electric piece is used, the button of the connecting part is pressed, the three fixed claws connected with the clamping mouth are opened outwards, the stirring shaft of the stirring rod extends into the middle of the three fixed claws, the button of the connecting part is released, the three fixed claws are automatically closed, and the fixed claws finish the clamping of the stirring shaft; the operator holds the handle of handheld electric part, presses the on & off switch on the handle simultaneously, and motor work drives the (mixing) shaft rotation, and the rotational speed can reach 8000 plus 10000 commentaries on classics/minute, loosens the on & off switch motor stop work on the handle, presses the button of connecting portion once more, and the homogenizer realizes separating with the (mixing) shaft of puddler.

Further, the sampling pipe is the cylinder, and the mouth of pipe of sampling pipe and the stopper of puddler can sealed fixed connection and separation.

Preferably, limit structure is including setting up in the first spacing portion of sampling pipe and setting up in the spacing portion of second of sampling pipe support, and first spacing portion sets up and realizes restricting the sampling pipe rotation through plane contact in the sampling pipe socle and the spacing portion of second. Preferably, the first limiting part comprises a limiting block arranged at the bottom of the sampling pipe, and the limiting block protrudes out of the pipe bottom of the sampling pipe; the second limiting part comprises a groove arranged on the sampling pipe support, and the groove is matched with the limiting block.

Preferably, the limiting block is a flat plate arranged along the bottom of the tube, or a plurality of flat plates arranged in parallel, or two flat plates arranged in a crossed manner; the groove is matched with the limiting block.

Preferably, the first limiting part is provided with an outer ring, the outer ring is obtained by extending the pipe wall in the direction far away from the pipe bottom, and the limiting block is arranged in the outer ring; the second limiting part comprises an outer ring groove matched with the outer ring.

Or, limit structure passes through the tooth's socket cooperation including setting up in sampling pipe and sampling pipe support, and the sampling pipe support includes the constant head tank that matches with the sampling pipe socle, sets up tooth or the groove that matches with the sampling pipe on the cell wall of constant head tank.

Preferably, the sampling pipe is provided with teeth protruding out of the pipe wall of the sampling pipe, and a groove matched with the teeth is formed in a positioning groove of the sampling pipe frame; the number of teeth and grooves is equal, and at least one tooth is provided. Or, the pipe wall of the sampling pipe is provided with a recess, and the positioning groove of the sampling pipe frame is provided with a bulge matched with the recess. The recess may not be recessed into the lumen of the sampling tube, but rather the wall thickness of the tube wall at the recess is reduced, for example, by providing a cut-out plane on the tube wall. Like this, on the constant head tank of sampling pipe support, the corresponding arch that sets up in the matching of surely making plane can realize spacing the rotation of sampling pipe.

The pipe orifice of the sampling pipe and the plug of the stirring rod can be fixedly connected and separated in a sealing manner, so that the sampling pipe has the functions of field treatment and culture of samples, and a tester can bring the sampling pipe to a detection field and directly place the samples into the sampling pipe to be fixed in a sealing manner by the stirring rod, so that the samples are directly brought back to a laboratory for homogenization and standby inspection without transferring the samples to a culture bottle; sampling tube bottom has the first spacing portion of adaptation sampling pipe support base to the steadiness of sampling tube when ensureing sample processing provides convenience for measurement personnel's transport simultaneously.

Further, the stopper of puddler is the round platform shape, and the stopper is provided with the through-hole, and the bearing is installed to the through-hole department of stopper, and the shape of stopper matches with the shape of sampling pipe bottleneck, and the material of stopper is soft material, and the stopper can be fixed with the sampling pipe bottleneck is sealed to in (mixing) shaft flexible contact.

Further, the (mixing) shaft contains link and stiff end, and the link is located the top of stopper, and the link of (mixing) shaft can match with the connection holder mouth of handheld electric part and link to each other, and the through-hole of stopper is passed to the link of (mixing) shaft, and the stirring leaf is installed to the stiff end of (mixing) shaft, and the through-hole sealing contact of (mixing) shaft and stopper, the (mixing) shaft pass the through-hole of stopper and can rotate in the through-hole department of.

Further, the stirring blades are of a paddle type and/or a turbine type and/or a screw type and/or an anchor type and/or a Brumakin type.

The stirring rod is integrated with the stirring blade and the plug, so that an operator can store, homogenize and culture a sample in the sampling tube in one step without transferring the sample to a special homogenizer to process the sample or transferring the processed sample to a culture bottle to culture; the puddler is disposable aseptic consumptive material, need wash and disinfection processing the puddler after need not handling a sample like when traditional homogenizer handles the sample to avoid coming from the cross contamination of puddler, improve operating personnel's work efficiency simultaneously.

Further, the sampling pipe support contains the base, stand and roof, through stand fixed connection between base and the roof, the base of sampling pipe support is the cuboid, the base upper surface is provided with the spacing portion of second, the spacing portion of second matches each other with the first spacing portion of sampling socle portion, the spacing portion of second sets up in the surface of base, the spacing portion of second is circular recess and, or alternately cross recess and, or a font recess, the roof of sampling pipe support is the rectangle, the roof is provided with the round hole, the round hole matches each other with the diameter of sampling pipe.

The sampling pipe frame is matched with the sampling pipe for use, and the second limiting part arranged on the base of the sampling pipe frame is matched with the first limiting part at the bottom of the sampling pipe, so that the sampling pipe is conveniently fixed on the sampling pipe frame, and the left and right rotation movement is prevented; the round hole of the roof of sampling pipe support matches each other with the diameter of sampling pipe, prevents that the sampling pipe from rocking and breaking away from the sampling pipe support.

Further, the lower surface of the base of the sampling pipe support is provided with a magnet.

The base design of sampling pipe support has magnet, and magnet adsorbs on the operation panel, and the stability of sampling pipe support when ensureing that the tester handles the sample.

The invention has the advantages that:

1. the puddler is integrated to have stirring leaf and stopper, and operating personnel can realize accomodating, homogeneity and the cultivation of sample with the sampling pipe cooperation step by step, need not to turn to and handles the sample in the special homogenizer, also need not to transfer the sample after handling to the blake bottle and cultivates.

2. The puddler is disposable aseptic consumptive material, need wash and disinfection processing the puddler after need not handling a sample like when traditional homogenizer handles the sample to avoid coming from the cross contamination of puddler, improve operating personnel's work efficiency simultaneously.

3. The design that sampling pipe bottom has the special base of adaptation makes things convenient for the experimenter singlehanded to plug the lid and screw, and the steadiness of sampling pipe when also guaranteeing sample processing simultaneously provides very big convenience for the experimenter.

4. The handheld electric part is provided with a connecting part, the fixing claw for connecting the clamping mouth can be detachably connected with the connecting end of the stirring shaft, the size is small, the carrying is convenient, and the processing efficiency of a sample can be improved.

Drawings

Fig. 1 is a schematic view of an assembly structure of a handheld homogenizer.

Fig. 2 is a schematic structural diagram of a handheld electric part of a handheld homogenizer.

Fig. 3 is a schematic diagram of a stirring rod structure of a handheld homogenizer.

Fig. 4 is a schematic diagram of a sampling tube of a hand-held homogenizer.

Fig. 5 is a schematic diagram of a sampling tube rack of a handheld homogenizer.

The labels in the figure are: the device comprises a stirring rod 1, a sampling tube 2, a sampling tube frame 3, a handheld electric component 4, a plug 11, a stirring blade 12, a stirring shaft 13, a connecting end 14, a fixed end 15, a first limiting part 21, a base 31, a stand column 32, a top plate 33, a second limiting part 34, a round hole 35, a magnet 36, a connecting part 41, a handle 42, an on-off switch 43, a button 44 and a connecting clamping mouth 45.

Detailed Description

As an embodiment, as shown in fig. 1 and 2, a hand-held homogenizer comprises a stirring rod 1, a sampling tube 2, a sampling tube rack 3 and a hand-held electric piece 4; handheld electric part 4 is connected with the puddler 1 is detachable, and puddler 1 comprises stopper 11, stirring leaf 12 and (mixing) shaft 13, is provided with stirring leaf 12 and stopper 11 on the (mixing) shaft 13, and stopper 11 can be sealed be fixed in on sampling pipe 2, and sampling pipe 2 bottom is provided with first spacing portion 21, and sampling pipe 2 location is placed on sampling pipe support 3.

Preferably, as shown in fig. 2, the handheld electric part 4 is composed of a connecting portion 41, a handle 42 and a motor, the handle 42 is a hollow cylinder, one end of the handle 42 is fixed to the connecting portion 41, the motor is located inside the connecting portion 41 and the handle 42, a battery is arranged inside the handle 42, an on-off key 43 is arranged on one side of the handle 42, the on-off key 43 is connected to the motor, the connecting portion 41 is provided with a button 44 and a connecting clamping jaw 45, and the connecting clamping jaw 45 comprises a fixed claw.

Preferably, a rechargeable battery is arranged inside the handheld electric component 4, so as to provide power for the motor, when the handheld electric component is used, the button 44 of the connecting part 41 is pressed down, the three fixed claws of the connecting clamping mouth 45 are opened outwards, the stirring shaft 13 of the stirring rod 1 extends into the middle of the three fixed claws, the button 44 of the connecting part 41 is released, the three fixed claws are automatically closed, and the fixed claws finish clamping the stirring shaft 13; the operator holds the handle 42 of handheld electric part 4, presses the on & off switch 43 on the handle 42 simultaneously, and motor work drives the (mixing) shaft 13 rotation, and the rotational speed can reach 8000 plus 10000 commentaries on classics/minute, loosens the on & off switch 43 motor stop work on the handle 42, presses the button 44 of connecting portion 41 once more, and the homogenizer realizes separating with the (mixing) shaft 13 of puddler 1.

Preferably, the fixing jaw connected with the clamping mouth 45 is a spring chuck, the spring chuck is opened due to the elasticity of the spring chuck when the button 44 is pressed, the stirring rod 1 can extend into the spring chuck, when the button 44 is released, the spring chuck rebounds upwards due to the elasticity of the spring chuck, the outer wall is extruded in the rebounding process, and then a conical structure with a small upper part and a large lower part is generated, so that the stirring rod 1 in the middle is clamped.

As an embodiment, as shown in fig. 4, the sampling tube 2 is a cylinder, the opening of the sampling tube 2 can be fixedly connected and separated with and from the plug 11 of the stirring rod 1 in a sealing manner, the bottom of the sampling tube 2 is provided with a first limiting portion 21, the first limiting portion 21 is located at the bottom of the tube body, and the first limiting portion 21 is of a circular convex groove structure and a cross-shaped convex groove structure, or a circular convex groove structure and a straight-line convex groove structure.

Preferably, limit structure is including setting up in the first spacing portion 21 of sampling pipe 2 and setting up in the spacing portion 34 of second of sampling pipe support 3, and first spacing portion 21 sets up in sampling pipe 2 socle and spacing portion 34 of second and realizes restricting sampling pipe 2 rotation through plane contact. Preferably, the first limiting part 21 comprises a limiting block arranged at the bottom of the sampling tube 2, and the limiting block protrudes out of the tube bottom of the sampling tube 2; the second limiting part 34 comprises a groove arranged on the sampling pipe frame 3, and the groove is matched with a limiting block.

Preferably, the first limiting part 21 has an outer ring, the outer ring is obtained by extending the pipe wall in a direction away from the pipe bottom, and the limiting block is arranged in the outer ring; the second stopper portion 34 includes an outer race groove that mates with the outer race.

Or, limit structure is including setting up in sampling pipe 2 and sampling pipe support 3 and passing through the tooth's socket cooperation, and sampling pipe support 3 includes the constant head tank that matches with 2 socles of sampling pipe, sets up tooth or the groove that matches with sampling pipe 2 on the cell wall of constant head tank.

Preferably, the sampling tube 2 is provided with teeth protruding out of the tube wall of the sampling tube 2, and a groove matched with the teeth is arranged on the positioning groove of the sampling tube frame 3; the number of teeth and grooves is equal, and at least one tooth is provided. Or, the pipe wall of the sampling pipe 2 is provided with a recess, and the positioning groove of the sampling pipe frame 3 is provided with a bulge matched with the recess. The depression may be formed without recessing the sampling tube 2 into the lumen, but by reducing the wall thickness of the tube wall in the depression, for example, by providing a cut-out surface on the tube wall. Like this, on sampling pipe support 3's the constant head tank, the rotation that the corresponding arch that sets up in the matching of cutting plane can realize sampling pipe 2 is spacing.

Preferably, the pipe orifice of the sampling pipe 2 and the plug 11 of the stirring rod 1 can be fixedly connected and separated in a sealing manner, so that the sampling pipe has the functions of field treatment and culture of samples, and a tester can bring the sampling pipe 2 to a detection field, directly place the samples into the sampling pipe 2 and seal and fix the samples by using the stirring rod 1, so that the samples are directly brought back to a laboratory for homogenization and standby detection without transferring the samples to a culture bottle; sampling pipe 2 bottom has the first spacing portion 21 of 3 bases 31 of adaptation sampling pipe support to sampling pipe 2's steadiness when ensureing sample processing provides convenience for measurement personnel's transport simultaneously.

As an embodiment, as shown in fig. 3, the plug 11 of the stirring rod 1 is in a circular truncated cone shape, the plug 11 is provided with a through hole, a bearing is installed at the through hole of the plug 11, the shape of the plug 11 is matched with the shape of the mouth of the sampling tube 2, the plug 11 is made of a soft material, and the plug 11 can be hermetically fixed with the mouth of the sampling tube 2 and flexibly contacted with the stirring shaft 13.

Preferably, the stirring shaft 13 comprises a connecting end 14 and a fixed end 15, the connecting end 14 is positioned above the plug 11, the connecting end 14 of the stirring shaft 13 can be matched and connected with the connecting clamping mouth 45 of the handheld electric part 4, the connecting end 14 of the stirring shaft 13 penetrates through the through hole of the plug 11, the fixed end 15 of the stirring shaft 13 is provided with the stirring blade 12, the stirring shaft 13 is in sealing contact with the through hole of the plug 11, and the stirring shaft 13 penetrates through the through hole of the plug 11 and can rotate at the through hole of the plug 11.

Preferably, the stirring vanes 12 are of paddle type and/or turbine type and/or screw type and/or anchor type and/or brulmakin type.

Preferably, the stirring rod 1 is integrated with the stirring blade 12 and the plug 11, so that an operator can receive, homogenize and culture the sample in the sampling tube 2 in one step without transferring the sample to a special homogenizer for processing the sample or transferring the processed sample to a culture bottle for culture; puddler 1 is disposable aseptic consumptive material, need wash and disinfection processing puddler 1 after need not just handling a sample like when traditional homogenizer handles the sample to avoid coming from puddler 1's cross contamination, improve operating personnel's work efficiency simultaneously.

As an embodiment, as shown in fig. 5, the sampling tube rack 3 includes a base 31, a column 32 and a top plate 33, the base 31 is fixedly connected with the top plate 33 through the column 32, the base 31 of the sampling tube rack 3 is a cuboid, a second limiting portion 34 is arranged on the upper surface of the base 31, the second limiting portion 34 is matched with the first limiting portion 21 at the bottom of the sampling tube 2, the second limiting portion 34 is arranged on the surface of the base 31, the second limiting portion 34 is a circular groove and/or a cross-shaped groove and/or a straight-line-shaped groove, the top plate 33 of the sampling tube rack 3 is rectangular, the top plate 33 is provided with a circular hole 35, and the circular hole 35 is matched with the diameter of the sampling tube 2.

Preferably, the sampling pipe frame 3 is matched with the sampling pipe 2 for use, and the second limit part 34 arranged on the base 31 of the sampling pipe frame 3 is matched with the first limit part 21 at the bottom of the sampling pipe 2, so that the sampling pipe 2 is conveniently fixed on the sampling pipe frame 3, and the left and right rotation movement is prevented; the round hole 35 of the top plate 33 of the sampling tube rack 3 is matched with the diameter of the sampling tube 2, so that the sampling tube 2 is prevented from shaking and separating from the sampling tube rack 3.

Preferably, the lower surface of the base 31 of the sampling tube holder 3 is provided with a magnet 36.

Preferably, the base 31 of the sampling tube rack 3 is designed with a magnet 36, and the magnet 36 is adsorbed on the operating platform, so that the stability of the sampling tube rack 3 when a tester processes a sample is ensured.

The invention has the beneficial effects that: stirring rod 1 is integrated with stirring leaf 12 and stopper 11, and operating personnel can realize taking in, homogeneity and cultivation of sample with sampling tube 2 cooperation step by step, need not to turn to and handle the sample in the special homogenizer, also need not to transfer the sample after handling to the blake bottle and cultivates. Puddler 1 is disposable aseptic consumptive material, need wash and disinfection processing puddler 1 after need not just handling a sample like when traditional homogenizer handles the sample to avoid coming from puddler 1's cross contamination, improve operating personnel's work efficiency simultaneously. The handheld electric part 4 is provided with the connecting part 41, the fixing claw connected with the clamping mouth 45 can be detachably connected with the connecting end 14 of the stirring shaft 13, the size is small, the carrying is convenient, the experimental personnel can be used by one hand, and the treatment efficiency of samples is improved.

The invention shown and described herein may be practiced in the absence of any element or elements, limitation or limitations, which is specifically disclosed herein. The terms and expressions which have been employed are used as terms of description and not of limitation, and there is no intention in the use of such terms and expressions of excluding any equivalents of the features shown and described or portions thereof, and it is recognized that various modifications are possible within the scope of the invention. It should therefore be understood that although the present invention has been specifically disclosed by various embodiments and optional features, modification and variation of the concepts herein described may be resorted to by those skilled in the art, and that such modifications and variations are considered to be within the scope of this invention as defined by the appended claims.

The contents of the articles, patents, patent applications, and all other documents and electronically available information described or cited herein are hereby incorporated by reference in their entirety to the same extent as if each individual publication was specifically and individually indicated to be incorporated by reference. Applicants reserve the right to incorporate into this application any and all materials and information from any such articles, patents, patent applications, or other documents.

Claims

1. A hand-held homogenizer is characterized by comprising a stirring rod, a sampling tube rack and a hand-held electric piece; handheld electric part and the detachable connection of puddler, the puddler comprises stopper, stirring leaf and (mixing) shaft, is provided with stirring leaf and stopper on the (mixing) shaft, and sampling pipe is sealed to the stopper, is equipped with the limit structure of restriction sampling pipe rotation between sampling pipe and the sampling pipe support.

2. The hand-held homogenizer of claim 1, wherein the hand-held electric actuator comprises a connecting portion, a handle and a motor, the handle is a hollow cylinder, one end of the handle is fixed to the connecting portion, the motor is located inside the connecting portion and the handle, the handle is internally provided with a battery, one side of the handle is provided with an on-off switch, the on-off switch is connected with the motor, the connecting portion is provided with a button and a connecting clamping nozzle, and the connecting clamping nozzle comprises a fixed claw.

3. The hand-held homogenizer of claim 1, wherein the sampling tube is a cylinder, and the nozzle of the sampling tube is capable of being sealably and fixedly connected and disconnected with the plug of the stirring rod.

4. The hand-held homogenizer of claim 1, wherein the limiting structure comprises a first limiting part disposed on the sampling tube and a second limiting part disposed on the sampling tube rack, the first limiting part is disposed at the bottom of the sampling tube and the second limiting part is in planar contact with each other to limit the rotation of the sampling tube.

5. The hand-held homogenizer of claim 4, wherein the first limit portion comprises a limit block disposed at the bottom of the sampling tube, the limit block protruding from the bottom of the sampling tube; the second limiting part comprises a groove arranged on the sampling pipe support, and the groove is matched with the limiting block.

6. The hand-held homogenizer of claim 1, wherein the position-limiting structure is arranged on the sampling tube and the sampling tube frame to be matched through a tooth socket, the sampling tube frame comprises a positioning groove matched with the tube bottom of the sampling tube, and teeth or grooves matched with the sampling tube are arranged on the groove wall of the positioning groove.

7. The hand-held homogenizer of claim 1, wherein the plug of the stirring rod is in the shape of a circular truncated cone, the plug is provided with a through hole, a bearing is installed at the through hole of the plug, the shape of the plug is matched with that of the opening of the sampling tube, the plug is made of a soft material, and the plug can be fixed with the opening of the sampling tube in a sealing manner and is in flexible contact with the stirring shaft.

8. The hand-held homogenizer of claim 1, wherein the stirring shaft comprises a connecting end and a fixed end, the connecting end is located above the plug, the connecting end of the stirring shaft can be connected with the connecting clamping mouth of the hand-held electric component in a matching manner, the connecting end of the stirring shaft passes through the through hole of the plug, the fixed end of the stirring shaft is provided with the stirring blade, the stirring shaft is in sealing contact with the through hole of the plug, and the stirring shaft passes through the through hole of the plug and can rotate at the through hole of the plug.

9. The hand-held homogenizer of claim 1, wherein the impeller is paddle-type and/or turbine-type and/or screw-type and/or anchor-type and/or brucau-type.

10. The hand-held homogenizer of claim 1, wherein the sampling tube rack comprises a base, a column and a top plate, the base is fixedly connected with the top plate through the column, the base of the sampling tube rack is a cuboid, a second limiting portion is arranged on the upper surface of the base, the second limiting portion is matched with the first limiting portion at the bottom of the sampling tube, the second limiting portion is arranged on the surface of the base, the second limiting portion is a circular groove and/or a crossed cross groove and/or a straight groove, the top plate of the sampling tube rack is rectangular, the top plate is provided with a round hole, and the round hole is matched with the diameter of the sampling tube.