Titration device for food inspection and analysis

Abstract

The utility model belongs to the technical field of food inspection equipment, particularly relates to a titration device for food inspection and analysis, and aims to solve the problems that in the prior art, liquid is easy to splash due to fixed intervals of burettes, and pollution is difficult to clean due to no waste liquid collection, the titration device comprises a base and a plurality of groups of burettes which are linearly distributed in the base, the device disclosed by the utility model has the beneficial effects that through the cooperation of the distance adjusting roller, the involute distance changing groove and the distance adjusting block, synchronous and equidistant adjustment of multiple groups of burettes is realized, the pre-fixing sleeve slides in a linkage manner without manual positioning, accurate alignment of a water dropper and a container and consistent parallel sample detection conditions are ensured, the result deviation rate is reduced, and the detection efficiency is improved. The clamping plate, the elastic clamping plate and the multi-stage spring buffer structure are matched with containers of various specifications, the containers are prevented from being damaged, the clamping stability is enhanced, the collecting hopper is designed to slide on one side, avoidance is performed before titration, redundant titration liquid is received after titration, pollution is prevented, cleaning is easy, and the clean experiment environment and operation safety are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a titration device, in particular to a food inspection analysis titration device belongs to food inspection equipment technical field. BACKGROUND

[0002] Titration analysis is to add the standard solution of known accurate concentration to the solution of measured substance until the added solution substance is exactly reacted completely according to the stoichiometric relationship, then according to the concentration of added standard solution and the volume consumed, calculates the analysis method of measured substance content. Titration analysis is often used in the test of food, drug safety detection.

[0003] It is found that the public (announcement) No. CN220626298U discloses a food inspection analysis titration device, the analysis titration device can simultaneously inspect multiple flasks, improve the inspection efficiency of the device, the rubber buckle acts on the rubber ring, which can constrain the top of the conical flask and allow the conical flask to move to a certain extent, so that the flask has a certain displacement reserve during shaking, which can avoid wear and tear of the flask and is conducive to the recycling of the flask. The above prior art scheme has the following disadvantages: the above analysis titration device lacks a dedicated waste liquid collection mechanism, and the excess titration liquid remaining in the dropping head after titration is easy to drop onto the experimental table, causing waste liquid dispersion pollution, which not only increases the subsequent cleaning workload, but also may affect the safety of the experimental environment. At the same time, the distance between the burettes is fixed and cannot be adjusted flexibly, which may cause the titration liquid to splash out of the container during multi-container synchronous titration, affecting the accuracy of the test results. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the problems of fixed distance between burettes, easy liquid splashing, no waste liquid collection, difficult cleaning and provides a food inspection analysis titration device.

[0005] The utility model realizes the above-mentioned purposes through the following technical scheme: a food inspection analysis titration device, comprising a base and multiple groups of burettes arranged linearly in the base.

[0006] A collecting hopper is arranged below the dropping head of the multiple groups of burettes, L-shaped connecting plates are fixedly installed at both ends of the collecting hopper, fixed guide rods are slidably connected to the surface of the L-shaped connecting plates, a strip-shaped groove is formed in the inner side wall of the base, the fixed guide rods are fixedly installed in the strip-shaped groove, and springs are sleeved on the surface of the fixed guide rods.

[0007] A positioning adjusting seat is fixedly installed in the base, multiple groups of pre-fixed sleeves are slidably connected to the surface of the positioning adjusting seat, the pre-fixed sleeves are used for pre-fixing the position of the flask, and the number of the multiple groups of pre-fixed sleeves is consistent with that of the multiple groups of burettes.

[0008] As a further scheme of the utility model: the inside top surface of the base is fixedly installed with a fixed plate, the surface of the fixed plate is installed with a hydraulic rod, the piston end of the hydraulic rod is installed with an adjusting sliding plate, the bottom surface of the adjusting sliding plate is fixedly installed with a slope rod, the slope rod is slidingly connected in the inclined hole opened in the surface of the L-shaped connecting plate.

[0009] As a further scheme of the utility model: the inside top surface of the base is fixedly installed with a fixed plate, the surface of the fixed plate is installed with a hydraulic rod, the piston end of the hydraulic rod is installed with an adjusting sliding plate, the bottom surface of the adjusting sliding plate is fixedly installed with a slope rod, the slope rod is slidingly connected in the inclined hole opened in the surface of the L-shaped connecting plate.

[0010] The variable distance groove is arranged in the shape of an involute when being unfolded, and the distance between the two adjacent variable distance grooves at the initial end and the distance between the two adjacent variable distance grooves at the tail end are the same.

[0011] As a further scheme of the utility model: the surface of the plurality of distance adjusting blocks is slidingly connected with a group of guide rods, and the guide rods are fixedly installed on the inner side wall of the base.

[0012] As a further scheme of the utility model: the bottom surface of the plurality of distance adjusting blocks is fixedly installed with a connecting rod, and the plurality of distance adjusting blocks are connected with the plurality of pre-fixed sleeves in one-to-one correspondence through the connecting rod.

[0013] As a further scheme of the utility model: the surface of the plurality of pre-fixed sleeves is provided with a giving strip groove, a fixed rod is installed in the giving strip groove, a sliding block is slidingly connected to the surface of the fixed rod, a spring two is sleeved on the surface of the fixed rod, a control sliding plate is fixed to the surface of the sliding block, and a clamping plate for fixing the flask is installed at the end of the control sliding plate.

[0014] As a further scheme of the utility model: the surface of the plurality of pre-fixed sleeves is provided with a giving strip groove, a fixed rod is installed in the giving strip groove, a sliding block is slidingly connected to the surface of the fixed rod, a spring two is sleeved on the surface of the fixed rod, a control sliding plate is fixed to the surface of the sliding block, and a clamping plate for fixing the flask is installed at the end of the control sliding plate.

[0015] As a further scheme of the utility model: a blind groove is formed at one end of the control sliding plate, a spring three is arranged in the blind groove, one end of the spring three abuts against one end of a T-shaped rod slidingly connected in the blind groove, and an elastic clamping plate is fixed to one end of the T-shaped rod penetrating through the one end of the control sliding plate.

[0016] As a further scheme of the utility model: a fixed guide block is fixed to the surface of the L-shaped connecting rod, and the fixed guide block is slidingly connected in a strip-shaped guide groove opened in the inner side wall of the base.

[0017] The utility model discloses beneficial effect is:

[0018] The device realizes the synchronous equidistance adjustment of multiple burettes through the cooperative design of the pitch roller, the involute variable-pitch groove and the pitch block, and the linkage sliding of the pre-fixing sleeve, so that manual repeated positioning is not needed, the outlet and the container center are accurately aligned, the parallel sample detection conditions are highly consistent, the detection result deviation rate is significantly reduced, and multiple parallel samples can be simultaneously titrated, compared with the traditional single-pipe titration mode, the detection efficiency is improved, the time consumption of food inspection batch detection is greatly shortened, and the laboratory efficient detection demand is met.

[0019] The combination of the clamping plate, the elastic clamping plate and the multistage spring buffering structure can be adapted to various specifications of glass containers, can avoid container breakage caused by excessive clamping force through elastic buffering, the elastic clamping plate made of silica gel enhances clamping stability, prevents container sliding deviation in the titration process, the collection hopper is designed in a unilateral sliding mode, automatically expands to avoid the container before titration, resets to receive excess titration liquid after titration, effectively avoids waste liquid dispersion and pollutes the experiment table, simplifies the subsequent processing process, and guarantees the clean experimental environment and the safety of the operator.

[0020] The device integrates functions such as pitch adjustment, container clamping and waste liquid collection, realizes multi-mechanism linkage driving through a hydraulic rod, does not need an additional power source, is compact in structure and small in space occupation, is convenient for laboratory layout and placement, the setting of the guide rod, the fixed guide block and other guide components ensures that each movement mechanism slides stably without jamming, the precise cooperation of the involute variable-pitch groove and the slide convex reduces mechanical wear and tear, prolongs the service life of the device, and the overall operation is reliable and stable. BRIEF DESCRIPTION OF DRAWINGS

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

[0022] Figure 2 It is the side view structure schematic diagram of the utility model Figure 1 ;

[0023] Figure 3 It is the structure schematic diagram of the inclined rod, the collection hopper and the inclined hole of the utility model;

[0024] Figure 4 It is the structure schematic diagram of the connecting rod and the pre-fixing sleeve of the utility model;

[0025] Figure 5 It is the structure schematic diagram of the variable-pitch groove, the pitch roller and the pitch block of the utility model;

[0026] Figure 6 It is the structure schematic diagram of the fixed guide block and the L-shaped connecting rod of the utility model;

[0027] Figure 7The utility model discloses a structure schematic diagram of clamping plate, control slide plate and fixed rod.

[0028] Figure 8 The utility model discloses a structure schematic diagram of fixed strip and control slide rod.

[0029] Figure 9 The utility model discloses Figure 2 The utility model discloses

[0030] Figure 10 The utility model discloses Figure 8 The utility model discloses

[0031] In the drawing: 1, base; 2, burette; 3, servo motor; 4, guide rod; 5, distance adjusting block; 6, slide convex; 7, distance adjusting roller; 8, distance changing groove; 9, fixed plate; 10, adjusting slide plate; 11, inclined rod; 12, collecting hopper; 13, L-shaped connecting plate; 14, inclined hole; 15, fixed guide rod; 16, spring one; 17, positioning adjusting seat; 18, pre-fixing sleeve; 19, connecting rod; 20, strip-shaped groove; 21, L-shaped connecting rod; 22, fixed guide block; 23, strip-shaped guide groove; 24, fixed strip; 25, control slide rod; 26, accommodating strip groove; 27, fixed rod; 28, slide block; 29, spring two; 30, control slide plate; 31, inclined strip groove; 32, clamping plate; 33, elastic clamping plate; 34, blind groove; 35, spring three; 36, T-shaped rod; 37, hydraulic rod; 38, sliding strip groove. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the utility model.

[0033] Embodiment one

[0034] As shown in Figures 1 to 10 A food inspection and analysis titration device, including base 1 and multiple groups of burette 2 that are arranged in linear distribution in base 1,

[0035] The drip head below multiple groups of burette 2 is provided with a same collecting hopper 12, and the two ends of collecting hopper 12 are fixedly installed with L-shaped connecting plate 13, the surface of L-shaped connecting plate 13 is slidably connected with fixed guide rod 15, the inner side wall of base 1 is provided with strip-shaped groove 20, and fixed guide rod 15 is fixedly installed in strip-shaped groove 20, and the surface of fixed guide rod 15 is sleeved with spring one 16;

[0036] A plurality of pre-fixing sleeves 18 are slidably connected to the surface of the positioning and adjusting seat 17, and the pre-fixing sleeves 18 are used for pre-fixing the position of the flask. The number of the plurality of pre-fixing sleeves 18 is consistent with the number of the plurality of burettes 2.

[0037] The single collection bucket 12 can receive all the excess liquid dropped from the burette drop head, avoid waste liquid dispersion to pollute the experimental table, simplify the subsequent waste liquid treatment process, the cooperation of the L-shaped connecting plate 13 and the fixed guide rod 15 ensures the smooth sliding of the collection bucket 12, the spring 16 can realize the automatic reset of the collection bucket 12, improve the operation convenience, the pre-fixing sleeve 18 can preliminarily position the flask, ensure the alignment of the burette drop head and the container center, reduce the manual positioning error; the number of the pre-fixing sleeve 18 is consistent with the number of the burette 2, which supports the synchronous titration of multiple parallel samples, significantly improves the detection efficiency, the overall structure is compact, occupies small space, and is convenient for laboratory layout and operation.

[0038] Further, the inner top surface of the base 1 is fixedly installed with a fixed plate 9, the surface of the fixed plate 9 is installed with a hydraulic rod 37, the piston end of the hydraulic rod 37 is installed with an adjusting sliding plate 10, the bottom surface of the adjusting sliding plate 10 is fixedly installed with a inclined rod 11, and the inclined rod 11 is slidably connected in the inclined hole 14 formed in the surface of the L-shaped connecting plate 13.

[0039] Through the extension and retraction movement of the hydraulic rod 37, the expansion and reset of the collection bucket 12 can be synchronously driven, without the need for an additional driving source, which simplifies the structure of the device. The cooperation of the inclined rod 11 and the inclined hole 14 converts the vertical linear motion into the horizontal sliding of the collection bucket 12, with high motion transmission efficiency and fast response speed.

[0040] Further, the top of the base 1 is rotatably connected with a pitch adjusting roller 7 for adjusting the distance between adjacent burettes 2, the surface of the pitch adjusting roller 7 is provided with a plurality of pitch adjusting blocks 5 for installing the burettes 2, the inner surfaces of the plurality of pitch adjusting blocks 5 are fixedly provided with sliding protrusions 6, the surface of the pitch adjusting roller 7 is provided with a plurality of pitch changing grooves 8 matched with the sliding protrusions 6, the plurality of pitch adjusting blocks 5 are slidably connected in the corresponding pitch changing grooves 8 through the sliding protrusions 6 one by one, and the plurality of burettes 2 are installed on the surface of the pitch adjusting blocks 5 one by one.

[0041] The pitch changing grooves 8 are arranged in the shape of an involute when expanded, and the distance between the two adjacent pitch changing grooves 8 at the initial end and the distance between the two adjacent pitch changing grooves 8 at the end are the same.

[0042] When the pitch adjusting roller 7 rotates, the sliding protrusions 6 slide along the involute pitch changing grooves 8, driving the pitch adjusting blocks 5 to move horizontally synchronously, realizing the equidistance adjustment of the distance between all burettes 2, ensuring the consistency of parallel sample detection conditions, reducing the systematic error of detection results, and adjusting the distance between the burettes 2 flexibly through the rotation of the pitch adjusting roller 7, adapting to sample containers of various diameters, without the need for replacing the titration assembly, and improving the versatility of the device.

[0043] Further, the surfaces of the plurality of distance adjusting blocks 5 are jointly and slidably connected with a set of guide rods 4, which are fixedly installed on the inner side wall of the base 1.

[0044] The guide rods 4 provide horizontal direction guiding constraint for the distance adjusting blocks 5, avoiding the distance adjusting blocks 5 from tilting or twisting during the sliding process, ensuring that the burette 2 always maintains a vertical state, and improving the titration accuracy.

[0045] Further, the bottom surfaces of the plurality of sets of distance adjusting blocks 5 are fixedly installed with connecting rods 19, and the plurality of sets of distance adjusting blocks 5 are connected with the plurality of pre-fixed sleeves 18 one by one through the connecting rods 19.

[0046] When the distance between the burettes 2 is adjusted, the pre-fixed sleeves 18 slide synchronously with the distance adjusting blocks 5 through the connecting rods 19, always maintaining one-to-one correspondence between the burettes 2 and the pre-fixed sleeves 18, without the need for manual repositioning of the containers, greatly improving the operation efficiency.

[0047] Embodiment Two

[0048] Improvements are made on the basis of Embodiment One:

[0049] Further, the surfaces of the plurality of sets of pre-fixed sleeves 18 are provided with a set of strip slots 26, and a fixed rod 27 is installed in the strip slots 26, the surface of the fixed rod 27 is slidably connected with a sliding block 28, the surface of the fixed rod 27 is sleeved with a spring 29, the surface of the sliding block 28 is fixed with a control sliding plate 30, and the end of the control sliding plate 30 is installed with a clamping plate 32 for clamping the flask.

[0050] The control sliding plate 30 is driven to move along the strip slot 26 towards the center of the pre-fixed sleeve 18, and the clamping plate 32 clamps the flask.

[0051] Further, the surfaces of the plurality of sets of pre-fixed sleeves 18 are provided with a set of inclined strip slots 31, and the same set of control sliding rods 25 are slidably connected in the plurality of inclined strip slots 31, the bottom surface of the adjusting sliding plate 10 is fixedly installed with an L-shaped connecting rod 21, one end of the L-shaped connecting rod 21 is installed with a fixed strip 24, the surface of the fixed strip 24 is provided with a sliding strip slot 38, and the end of the control sliding rod 25 is slidably connected in the sliding strip slot 38.

[0052] The adjusting sliding plate 10 is driven to move up and down by the hydraulic rod 37, the L-shaped connecting rod 21 drives the fixed strip 24 to move synchronously, the control sliding rod 25 slides in the inclined strip slot 31 and the sliding strip slot 38, and all the clamping plates 32 in the pre-fixed sleeves 18 are synchronously clamped or loosened, realizing the synchronous clamping of multiple containers and improving the operation efficiency.

[0053] Further, one end of the control sliding plate 30 is provided with a blind groove 34, and a spring three 35 is arranged in the blind groove 34. One end of the spring three 35 abuts against one end of a T-shaped rod 36 slidingly connected in the blind groove 34. The T-shaped rod 36 is fixed with an elastic clamping plate 33 at one end penetrating through the control sliding plate 30.

[0054] The spring three 35 and the elastic clamping plate 33 form a double buffering structure, further buffering the clamping force, avoiding damage to the container due to rigid contact, and the elastic clamping plate 33 is made of silica gel material, which can be closely attached to the surface of the container to enhance the friction force and prevent the container from sliding.

[0055] Further, the surface of the L-shaped connecting rod 21 is fixed with a fixed guide block 22 slidingly connected in a strip-shaped guide groove 23 formed in the inner side wall of the base 1.

[0056] The fixed guide block 22 slides along the strip-shaped guide groove 23 to provide vertical direction guiding constraint for the L-shaped connecting rod 21, avoiding inclination or torsion of the L-shaped connecting rod 21 during movement, and ensuring the accuracy of the control sliding rod 25 movement.

[0057] Working principle: when in use, first drive the servo motor 3 to drive the pitch adjusting roller 7 to rotate. The pitch adjusting groove 8 on the surface of the pitch adjusting roller 7 is a involute structure. When the pitch adjusting roller 7 rotates, the slide convex 6 on the inner side of the pitch adjusting block 5 slides along the pitch adjusting groove 8. Since the pitch adjusting groove 8 has a regular change in pitch, the pitch adjusting block 5 slides horizontally along the guide rod 4, thereby synchronously changing the pitch of the adjacent buret 2. The pitch adjusting block 5 is connected with the pre-fixed sleeve 18 one by one through the connecting rod 19. Therefore, when the pitch of the buret 2 is adjusted, the pre-fixed sleeve 18 will slide synchronously along the positioning adjusting seat 17, and the buret 2 and the sample container are always accurately aligned. This mechanism can realize synchronous equidistance adjustment of multiple burets 2, adapt to sample containers of different diameters, ensure consistent parallel sample detection conditions, and reduce detection result deviation rate.

[0058] The pre-fixed sleeve 18 slides along the positioning adjusting seat 17 to the position corresponding to the buret 2, and the sample flask is placed in the pre-fixed sleeve 18 to realize preliminary positioning. The hydraulic rod 37 pushes the adjusting sliding plate 10 to move downward, drives the L-shaped connecting rod 21 to move downward synchronously, and the fixed strip 24 moves downward. The control sliding rod 25 slides in the sliding strip groove 38 and the inclined strip groove 31, drives the control sliding plate 30 to move to the center of the pre-fixed sleeve 18 along the make room strip groove 26, clamps the flask with the clamping plate 32 and the elastic clamping plate 33, and provides buffering with the spring two 29 and the spring three 35 to avoid damage to the container due to excessive clamping force. The elastic clamping plate 33 is made of silica gel material, which further enhances the stability and adaptability of clamping and improves the titration accuracy. In this process, the inclined rod 11 is inserted into the inclined hole 14 of the L-shaped connecting plate 13. With the downward movement of the inclined rod 11, the L-shaped connecting plate 13 slides along the fixed guide rod 15 to one side to expose the buret;

[0059] After titration is completed, the hydraulic rod 37 resets to drive the adjusting sliding plate 10 to move upwards, the inclined rod 11 exits from the inclined hole 14, the elastic force of the spring I 16 drives the L-shaped connecting plate 13 to slide reversely along the fixed guide rod 15, the collecting hopper 12 resets to fold, so as to facilitate the operator to take out the sample container, at the same time, the inclined rod 11 is inserted into the inclined hole 14 of the L-shaped connecting plate 13, with the upward movement of the inclined rod 11, the L-shaped connecting plate 13 slides along the fixed guide rod 15 to one side, and the collecting hopper 12 is expanded synchronously to be directly below all the drip heads of the titration tube 2, so as to accurately receive the excess titration liquid dropped by the drip head;

[0060] The collecting hopper 12 is integrally formed by PP material, the surface is subjected to anti-sticking treatment, the residual titration liquid can be avoided, the expansion mode of unilateral sliding can be adapted to titration tubes 2 with different intervals, and waste liquid pollution of the experiment table is effectively prevented.

[0061] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalent elements of the claims are intended to be embraced in the present application. Any reference signs in the claims should not be regarded as limiting the claims to which they relate.

[0062] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A food inspection analysis titration device, comprising a base (1) and a plurality of groups of burettes (2) arranged in a linear distribution within the base (1); characterized in that: A plurality of drip heads of the burette (2) are provided below the same collection bucket (12), both ends of the collection bucket (12) are fixedly installed with L-shaped connecting plates (13), the surface of the L-shaped connecting plate (13) is slidably connected with a fixed guide rod (15), the inner side wall of the base (1) is provided with a strip-shaped groove (20), the fixed guide rod (15) is fixedly installed in the strip-shaped groove (20), and the surface of the fixed guide rod (15) is sleeved with a spring (16). A plurality of pre-fixing sleeves (18) are slidably connected to the surface of the positioning adjusting seat (17), and the pre-fixing sleeve (18) is used for pre-fixing the position of the flask. The number of the plurality of pre-fixing sleeves (18) is consistent with the number of the plurality of burettes (2).

2. A food inspection analytical titration apparatus as defined in claim 1, wherein: The inner top surface of the base (1) is fixedly installed with a fixed plate (9), the surface of the fixed plate (9) is installed with a hydraulic rod (37), the piston end of the hydraulic rod (37) is installed with an adjusting sliding plate (10), the bottom surface of the adjusting sliding plate (10) is fixedly installed with an inclined rod (11), and the inclined rod (11) is slidably connected in the inclined hole (14) formed in the surface of the L-shaped connecting plate (13).

3. The food inspection analytical titration apparatus of claim 1, wherein: The base (1) is rotatably connected with a pitch adjusting roller (7) for adjusting the spacing between adjacent burettes (2) at the top, the surface of the pitch adjusting roller (7) is provided with a plurality of pitch adjusting blocks (5) for installing burettes (2), the inner surface of each of the plurality of pitch adjusting blocks (5) is fixedly provided with a sliding convex (6), the surface of the pitch adjusting roller (7) is provided with a plurality of pitch adjusting grooves (8) matched with the sliding convex (6), each of the plurality of pitch adjusting blocks (5) is slidably connected in the corresponding pitch adjusting groove (8) through the sliding convex (6), and each of the plurality of burettes (2) is installed on the surface of the pitch adjusting block (5). The pitch adjusting grooves (8) are arranged in the shape of an involute when expanded, and the spacing between the two adjacent pitch adjusting grooves (8) at the initial end and the spacing between the two adjacent pitch adjusting grooves (8) at the end are the same.

4. A food testing and analysis titration apparatus as claimed in claim 3, wherein: The surfaces of the plurality of pitch adjusting blocks (5) are slidably connected with a group of guide rods (4), and the guide rods (4) are fixedly installed on the inner side wall of the base (1).

5. The food inspection analytical titration apparatus of claim 3, wherein: The bottom surfaces of the plurality of pitch adjusting blocks (5) are fixedly installed with connecting rods (19), and the plurality of pitch adjusting blocks (5) are connected with the plurality of pre-fixing sleeves (18) one by one through the connecting rods (19).

6. The food inspection analytical titration apparatus of claim 2, wherein: A plurality of pre-fixing sleeves (18) are provided with a let-go strip groove (26), a fixed rod (27) is installed in the let-go strip groove (26), a sliding block (28) is slidably connected to the surface of the fixed rod (27), a spring (29) is sleeved on the surface of the fixed rod (27), a control sliding plate (30) is fixed to the surface of the sliding block (28), and a clamping plate (32) for fixing the flask is installed at the end of the control sliding plate (30).

7. A food inspection analytical titration apparatus as defined in claim 6, wherein: A plurality of groups of the pre-fixing sleeve (18) are provided with inclined strip grooves (31), and a same group of control sliding rods (25) are slidably connected in the plurality of groups of inclined strip grooves (31); the bottom surface of the adjusting sliding plate (10) is fixedly provided with an L-shaped connecting rod (21), one end of the L-shaped connecting rod (21) is provided with a fixed strip (24), the surface of the fixed strip (24) is provided with a sliding strip groove (38), and the end of the control sliding rod (25) is slidably connected in the sliding strip groove (38).

8. A food inspection analytical titration apparatus as defined in claim 7, wherein: One end of the control sliding plate (30) is provided with a blind groove (34), the blind groove (34) is provided with a spring three (35), one end of the spring three (35) abuts against one end of a T-shaped rod (36) slidably connected in the blind groove (34), and the T-shaped rod (36) penetrates one end of the control sliding plate (30) and is fixedly provided with an elastic clamping plate (33).

9. A food inspection analytical titration apparatus as defined in claim 8, wherein: The surface of the L-shaped connecting rod (21) is fixedly provided with a fixed guide block (22), and the fixed guide block (22) is slidably connected in a strip-shaped guide groove (23) provided in the inner side wall of the base (1).

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