Heating device for organophosphorus detection test paper

Abstract

The utility model relates to the field of color development method detection, in particular to a heating device for organophosphorus detection test paper. The heating assembly is arranged on the base; the heat-conducting fin is in heat conduction connection with the heating assembly; the at least one pressing mechanism is located on the side of the heat-conducting fin, and the pressing mechanism comprises a first limiting arm which is provided with a first arm extending upwards and a second arm extending transversely; a third arm extending upward; the fourth arm transversely extends, one end of the fourth arm is fixed at the upper end of the third arm, and the other end of the fourth arm overhangs above the heat-conducting fin; the fifth arm extends transversely, one end of the fifth arm is fixed to the lower end of the third arm, and the other end of the fifth arm is connected with the first arm through a first hinge; according to the utility model, the positioning accuracy of the test paper during heating can be improved, detection errors caused by displacement or deformation are avoided, and the device can be applied to scenes such as heating of the test paper in food safety detection, environmental monitoring and medical diagnosis and the like, and collaborative scenes with optical detection.

Description

Technical Field

[0001] The utility model relates to the field of colorimetric detection, in particular to a heating device for an organophosphorus test paper. Background Art

[0002] Pesticide residues are a major food safety issue. Among the diverse types of pesticides, organophosphates are among the most frequently used in agricultural production. According to relevant statistics, organophosphates currently account for approximately 40% of the global pesticide market. In the Chinese pesticide market, organophosphates are the most diverse and widely used pesticides.

[0003] For example, the grain raw materials used in winemaking are susceptible to pesticide contamination throughout their cultivation, storage, processing, and distribution, making it essential to monitor pesticide residues during the winemaking process. Currently, rapid pesticide residue detection technologies primarily include chemical colorimetry, enzyme inhibition, immunoassays, and biosensors. Existing on-site testing methods for raw liquor typically utilize chemical colorimetry. This method, based on the chemical structure of organophosphorus pesticides, requires an acetylation reaction with 4-(p-nitrobenzyl)pyridine (NBP) at 110-120°C. The resulting compound exhibits a bluish-purple color under alkaline conditions. Currently, a relatively rapid heating method involves placing a test strip on a heating element for rapid heating to continuously induce the acetylation reaction. However, current test strips typically consist of multiple layers with varying thermal expansion coefficients. At higher temperatures, such as 110-120°C, this difference in thermal expansion coefficients between the test strip and the base plate can cause the test strip to warp, slip, or even deform. This can shift the test strip's position and the heating contact area, leading to uneven heating and directly impacting the accuracy of test results. At the same time, at higher temperatures, it is difficult to correct and operate manually, and the operation with the help of tools is inefficient.

[0004] Existing technologies cannot meet the needs of fast, accurate and universal testing. There is an urgent need for a new test paper heating and fixing structure to facilitate the continuous acetylation reaction of the colorimetric test paper. Utility Model Content

[0005] The purpose of the utility model is to address the deficiencies of the existing technology and provide an organophosphorus test strip heating device, which can improve the positioning accuracy of the test strip during heating and avoid detection errors caused by displacement or deformation. The device can be used in scenarios such as heating test strips in food safety testing, environmental monitoring, and medical diagnosis, as well as in collaborative scenarios with optical detection.

[0006] The purpose of the utility model is achieved as follows: a heating device for organic phosphorus test paper, comprising:

[0007] base;

[0008] A heating component is provided on the base;

[0009] a heat conducting sheet, thermally connected to the heating assembly;

[0010] At least one pressing mechanism is located beside the heat conducting plate, and the pressing mechanism includes:

[0011] A first limiting arm having a first arm extending upward and a second arm extending laterally;

[0012] the third arm, extending upward;

[0013] a fourth arm extending transversely, with one end fixed to the upper end of the third arm and the other end cantilevered above the heat conducting plate;

[0014] a fifth arm extending transversely, one end of which is fixed to the lower end of the third arm, and the other end of which is connected to the first arm via a first hinge;

[0015] a lower support arm, rotatably connected to the bottom wall of the fifth arm via a second hinge;

[0016] a positioning member, disposed between the lower support arm and the fifth arm;

[0017] a driving member, mounted on the positioning member and transmission-connected to the lower arm to drive the fifth arm, thereby driving the fourth arm to swing around the first hinge, so that the distal end of the fourth arm presses the member to be pressed;

[0018] The first limiting arm, the third arm, the fourth arm, the fifth arm, the first hinge and the second hinge are integrally formed of plastic.

[0019] A thermocouple is provided at the bottom of the thermal conductive sheet;

[0020] The controller is electrically connected to the thermocouple and the heating component respectively for temperature control.

[0021] The upper end of the first limiting arm is higher than the upper plane of the heat conducting plate.

[0022] The driving element is a piezoelectric, thermal expansion, bimetallic or electromagnetic driver.

[0023] The driving member is a sheet-shaped member made of memory alloy material;

[0024] The driving member is straight or forms an arc with a curvature radius ≥ R1 under a preset low temperature state;

[0025] The driving member forms an arc with a curvature radius ≤ R2 under a preset high temperature state, wherein R2 <R1。

[0026] The positioning member is provided with a matching groove, in which a supporting member that can float in the up and down directions is slidably matched. A driving member is provided in the matching groove, and the driving member abuts against the bottom of the supporting member.

[0027] The bottom wall of the support member is provided with a protrusion, and the protrusion is slidably matched with the matching groove.

[0028] A downwardly extending connecting arm is provided at the distal end of the positioning member, and the connecting arm is detachably connected to the base.

[0029] The distal end of the second arm extends farther than the lower arm; the clamping mechanisms are symmetrically arranged on both sides of the heat conducting plate; and the center of gravity of the structure formed by connecting the third arm, the fourth arm, and the fifth arm is located on the side of the second hinge away from the heat conducting plate.

[0030] The above scheme has the following beneficial effects: the heat conducting plate can be heated by the heating element, and the heat conducting plate can heat the test paper more evenly, wherein the fourth arm of the clamping mechanism is suspended above the heat conducting plate, and the space between the fourth arm and the heat conducting plate is used to place the test paper, wherein the lower arm and the fifth arm in the clamping mechanism, when the driving element acts, the lower arm provides a reaction force to the positioning element, and the driving element provides an action force to the fifth arm, because the action force on the driving element comes from the clamping mechanism itself, the placement error of the clamping mechanism has no effect on the driving accuracy of the driving element, and the driving element is relatively accurate in its relative position on the clamping member, so that the fifth arm can produce an angular displacement, and then drive the fourth arm to swing down and press, and the third arm, the fourth arm, and the fifth arm form a deflected cantilever, which can also provide a certain degree of elasticity to avoid rigid contact with the test paper, and can continuously press the test paper, and can also prevent excessive pressing force from damaging the test paper. The use of this utility model can reliably press the test paper, and can prevent problems such as warping and uneven heating during the heating process. The purpose of the utility model is to address the deficiencies of the existing technology and provide an organophosphorus test strip heating device, which can improve the positioning accuracy of the test strip during heating and avoid detection errors caused by displacement or deformation. The device can be used in scenarios such as heating test strips in food safety testing, environmental monitoring, and medical diagnosis, as well as in collaborative scenarios with optical detection.

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural diagram of the present utility model.

[0033] In the accompanying drawings, 100 is the base, 200 is the heating component, 300 is the heat conducting plate, 500 is the pressing mechanism, 510 is the first limiting arm, 511 is the first arm, 512 is the second arm, 520 is the third arm, 530 is the fourth arm, 540 is the fifth arm, 550 is the first hinge, 560 is the lower support arm, 570 is the second hinge, 580 is the positioning member, 581 is the connecting arm, 590 is the driving member, 620 is the matching groove, 630 is the supporting member, and 640 is the protrusion. DETAILED DESCRIPTION

[0034] With reference to the accompanying drawings, specific embodiments of the present invention will be described in detail.

[0035] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] In the description of this application, it should be understood that the orientations or positional relationships indicated by terms such as center, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, and outside are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting this application. In the description of this application, the terms first and second are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as first and second can be used to explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more. It should be noted that in actual applications, due to the limitations of equipment accuracy or installation errors, absolute parallel or perpendicular effects are difficult to achieve. The description of vertical, parallel or same direction in this application is not an absolute limiting condition, but means that a vertical or parallel structural setting can be achieved within a preset error range and the corresponding preset effect can be achieved. In this way, the technical effect of the limited features can be maximized, and the corresponding technical solution can be easy to implement and has high feasibility.

[0037] In the description of this specification, reference to the terms one embodiment, some embodiments, examples, specific examples, or some examples means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0038] See also Figure 1, an embodiment of an organophosphorus detection test paper heating device, includes a base 100, a heating component 200, a heat conductive sheet 300 and a pressing mechanism 500. Among them, the base 100 serves as the supporting structure of the entire device. The heating component 200 is installed on the base 100, and may include a heating element and a controller. The controller can accurately control the heating temperature to meet different heating requirements; the heating element can be a heating wire, a flexible PTC heating sheet, etc.; of course, a semiconductor refrigeration sheet can be added, and its hot end can be used for auxiliary heating. After the heating is completed, the current is reversed and the test paper is cooled quickly. The heat conductive sheet 300 is thermally connected to the heating component 200, and is preferably made of a high thermal conductivity metal material, such as aluminum or copper, to ensure that the heat is evenly transferred to the part to be pressed.

[0039] At least one pressing mechanism 500 is located beside the heat conducting plate 300. Preferably, the pressing mechanisms 500 are symmetrically arranged on both sides of the heat conducting plate 300, which is more stable and uniform, and the horizontal force of the pressing mechanism 500 can be balanced.

[0040] Each pressing mechanism 500 includes a first limiting arm 510 , a third arm 520 , a fourth arm 530 , a fifth arm 540 and a lower support arm 560 .

[0041] The first limiting arm 510 has an upwardly extending first arm 511 and a laterally extending second arm 512. The first arm 511 and the second arm 512 are connected to form an L-shaped structure, wherein the second arm 512 is supported on the base 100. The third arm 520 extends upward and is connected to the fourth arm 530 and the fifth arm 540. The fourth arm 530 extends laterally, with one end fixed to the upper end of the third arm 520 and the other end cantilevered above the thermal conductive plate 300 for direct contact and compression of the part to be compressed, i.e., the test paper. The fifth arm 540 extends laterally, with one end fixed to the lower end of the third arm 520 and the other end connected to the first arm 511 via a first hinge 550. The lower support arm 560 is rotatably connected to the bottom wall of the fifth arm 540 via a second hinge 570.

[0042] The positioning member 580 is provided between the lower support arm 560 and the fifth arm 540 and is used to limit the relative position of the two.

[0043] The driving member 590 is installed on the positioning member 580 and is connected to the lower support arm 560 to drive the fifth arm 540, driving the fourth arm 530 to swing around the first hinge 550, so that the far end of the fourth arm 530 presses the part to be pressed.

[0044] In some embodiments, a thermocouple is provided at the bottom of the thermal conductive sheet 300 , and a controller is electrically connected to the thermocouple and the heating component 200 , respectively. The thermocouple is used to provide temperature feedback to facilitate temperature control.

[0045] In some embodiments, the first limiting arm 510, the third arm 520, the fourth arm 530, the fifth arm 540, the first hinge 550, and the second hinge 570 are integrally molded from plastic. This method allows for integrated design and processing, a simplified structure, reduced volume and mass, and the elimination of assembly. There is no gap or friction, no wear or lubrication, and no contamination. This significantly reduces manufacturing costs, installation costs, and operating costs. In particular, through one-shot plastic molding, mass production can significantly reduce operating costs, while also providing high precision and adapting to miniaturized structural designs. This facilitates disposable use, significantly reduces cost burdens, and avoids test paper contamination, improving detection accuracy. Furthermore, in the unactuated state, the integrally molded hinge has minimal bending resistance, enabling the fourth arm 530 to extend outward without being pressed downward, eliminating the need for other mechanisms to support the fourth arm 530. The center of gravity of the structure formed by the third arm 520, the fourth arm 530, and the fifth arm 540 is located on the side of the second hinge 570 away from the heat conducting plate 300. In a natural state, the fourth arm 530 has a tendency to expand outward, making it easier to maintain a gap between it and the heat conducting plate 300.

[0046] In some embodiments, the upper end of the first limiting arm 510 is higher than the upper plane of the thermal conductive plate 300, wherein the first limiting arm 510 can also limit the side wall of the test paper on the thermal conductive plate 300. At the same time, in the case of disposable use, it can avoid contamination of the test paper by the limiting device and avoid the risk of decreased detection accuracy.

[0047] In some embodiments, the driver 590 is a piezoelectric, thermal expansion, bimetallic, or electromagnetic driver. The piezoelectric driver 590 utilizes the inverse piezoelectric effect of the piezoelectric material to convert input electrical energy into mechanical energy, thereby compressing the clamping mechanism 500. A thermal expansion driver utilizes a piston-like structure containing gas or solids, such as paraffin wax. The gas or paraffin wax undergoes a volume change at high temperatures, thereby driving the clamping mechanism 500. A bimetallic driver utilizes its warping at high temperatures to drive the clamping mechanism 500 for compression. Electromagnetic drive structures, such as miniature linear motors, can also be used. Bimetallic drivers offer a relatively simple structure and cost, and can autonomously actuate the clamping mechanism 500 based on temperature.

[0048] In some embodiments, the driving member 590 may also be a sheet member made of a shape memory alloy material; the shape memory alloy material may be a nickel-titanium alloy, a copper-based shape memory alloy, an iron-based shape memory alloy, etc. The driving member 590 is straight or forms an arc with a curvature radius ≥ R1 in a preset low-temperature state; the driving member 590 forms an arc with a curvature radius ≤ R2 in a preset high-temperature state, where R2 < R1. When the temperature rises, the driving member 590 responds to the temperature change, and the height of the raised arc increases, thereby actuating the pressing mechanism 500. When the temperature drops, the height of the raised arc decreases, releasing the actuation of the pressing mechanism 500, and the pressing mechanism 500 gradually resets. The shape memory alloy is used as the driving member 590, which directly drives the shape recovery through phase change, simplifies the transmission mechanism, realizes functional integration, has a high driving force density, can output a large driving force with a small volume, supports temperature electric heating / environmental change control, and can adapt to a power-free / extreme environment without a complex electronic system. At the same time, it operates quietly and has low power consumption, especially meeting the requirements of miniaturization, high reliability, energy saving and quietness.

[0049] In some embodiments, the positioning member 580 is provided with a fitting groove 620, and a support member 630 that can float in the up and down direction is slidably fitted in the fitting groove 620. A driving member 590 is provided in the fitting groove 620, and the driving member 590 abuts against the bottom of the support member 630. By the operation of the driving member 590, the support member 630 can be actuated, and then the pressing mechanism 500 can be actuated. The driving member 590 is located in the relatively closed fitting groove 620, and its working environment is relatively stable.

[0050] In some embodiments, a convex block 640 is provided on the bottom wall of the support member 630, and the convex block 640 is slidably fitted with the fitting groove 620. By the cooperation of the convex block 640 and the fitting groove 620, the relative position between the support member 630 and the positioning member 580 can be defined.

[0051] In some embodiments, a connecting arm 581 extending downward is provided at the distal end of the positioning member 580, and the connecting arm 581 is detachably connected to the base 100. By adopting this method, the positioning member 580 can be quickly fixed to keep its position stable. The detachable connection can be quickly connected and disassembled by means such as magnetic attraction and snap connection, which is convenient for the quick positioning and quick replacement of the pressing mechanism 500.

[0052] In some implementations, the outer extension distance of the distal end of the second arm 512 is greater than the outer extension distance of the lower arm 560. By adopting this method, the positioning member 580 can first contact the second arm 512, and through the guidance of the second arm 512, it can be quickly inserted into the position between the second arm 512 and the lower arm 560.

[0053] The operating principle of this utility model is as follows: When the object to be compressed, such as a test paper, needs to be compressed, the driver 590 is activated, driving the fifth arm 540 to rotate about the first hinge 550, causing a slight rotational deformation of the second hinge 570. The rotation of the fifth arm 540 drives the third and fourth arms 520 and 530 to swing about the first hinge 550, causing the distal end of the fourth arm 530 to move downward, compressing the object to be compressed on the thermal conductive sheet 300. Because the pair of compression mechanisms 500 are symmetrically positioned on either side of the thermal conductive sheet 300, they ensure uniform pressure on the object to be compressed, improving the consistency of the test or processing results.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A heating device for organophosphorus test paper, characterized in that: include: base(100); A heating component (200) is provided on the base (100); A heat conducting sheet (300) is connected to the heating component (200) via thermal conduction; At least one pressing mechanism (500) is located beside the heat conducting sheet (300), and the pressing mechanism (500) comprises: A first limiting arm (510) having an upwardly extending first arm (511) and a laterally extending second arm (512); a third arm (520), extending upward; a fourth arm (530) extending transversely, with one end fixed to the upper end of the third arm (520) and the other end cantilevered above the heat conducting plate (300); a fifth arm (540) extending transversely, one end of which is fixed to the lower end of the third arm (520), and the other end of which is connected to the first arm (511) via a first hinge (550); A lower support arm (560) is rotatably connected to the bottom wall of the fifth arm (540) via a second hinge (570); A positioning member (580) is provided between the lower support arm (560) and the fifth arm (540); a driving member (590) mounted on the positioning member (580) and connected to the lower support arm (560) in a transmission manner to drive the fifth arm (540), thereby driving the fourth arm (530) to swing around the first hinge (550), so that the distal end of the fourth arm (530) presses the member to be pressed; The first limiting arm (510), the third arm (520), the fourth arm (530), the fifth arm (540), the first hinge (550) and the second hinge (570) are integrally formed of plastic.

2. The organophosphorus test paper heating device according to claim 1, characterized in that: A thermocouple is provided at the bottom of the heat conducting sheet (300); The controller is electrically connected to the thermocouple and the heating component (200) respectively for temperature control.

3. The organophosphorus test paper heating device according to claim 1, characterized in that: The upper end of the first limiting arm (510) is higher than the upper plane of the heat conducting plate (300).

4. The organophosphorus test paper heating device according to claim 1, characterized in that: The driving member (590) is a piezoelectric, thermal expansion, bimetallic or electromagnetic driver.

5. The organophosphorus test paper heating device according to claim 1, characterized in that: The driving member (590) is a sheet-shaped member made of a memory alloy material; The driving member (590) is straight or forms an arc with a curvature radius ≥ R1 under a preset low temperature state; The driving member (590) forms an arc with a curvature radius ≤ R2 under a preset high temperature state, wherein R2 <R1。 6. The organophosphorus test paper heating device according to claim 1, characterized in that: The positioning member (580) is provided with a matching groove (620), and a supporting member (630) that can float in the vertical direction is slidably matched in the matching groove (620). A driving member (590) is provided in the matching groove (620), and the driving member (590) abuts against the bottom of the supporting member (630).

7. The organophosphorus test paper heating device according to claim 6, characterized in that: A protrusion (640) is provided on the bottom wall of the support member (630), and the protrusion (640) is slidably engaged with the engaging groove (620).

8. The organophosphorus test paper heating device according to claim 1, characterized in that: A downwardly extending connecting arm (581) is provided at the distal end of the positioning member (580), and the connecting arm (581) is detachably connected to the base (100).

9. The organophosphorus test paper heating device according to claim 1, characterized in that: The distal end of the second arm (512) has a greater outward extension distance than the lower support arm (560); the clamping mechanisms (500) are symmetrically arranged on both sides of the heat conducting plate (300); and the center of gravity of the structure formed by connecting the third arm (520), the fourth arm (530), and the fifth arm (540) is located on the side of the second hinge (570) away from the heat conducting plate (300).

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