Sample holder for microwave digestion instrument

Abstract

The utility model relates to the field of detection, and particularly discloses a sample holder for a microwave digestion instrument, which is characterized by comprising an upper plate body and a lower plate body, a positioning groove is formed in the upper surface of the lower plate body, a connecting part is formed on the upper surface of the lower plate body, a locking piece is rotatably connected to the upper plate body, the locking piece is in threaded connection with the connecting part, and the locking piece is in threaded connection with the connecting part. The upper plate body is provided with a guide piece, and the guide piece is matched with the connecting part to limit rotation of the upper plate body. By the adoption of the technical scheme, during use, the bottom of the explosion-proof pipe is inserted into the positioning groove, then the locking piece is rotated, the locking piece drives the upper plate body to move downwards to abut against the top of the explosion-proof pipe, and rapid fixing of the explosion-proof pipe is achieved through clamping of the upper plate body and the lower plate body.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of detection, in particular to a sample rack for a microwave digestion instrument. BACKGROUND

[0002] With the rapid development of modern analytical chemistry technology, microwave digestion instruments, as the core equipment for sample pretreatment, are widely used in environmental monitoring, food analysis, geological exploration and other fields. Its core function is to realize efficient decomposition of samples through microwave heating and high-pressure environment, and the structure design of the sample rack, as the key component for carrying the digestion tank, directly affects the safety and reliability of the experiment.

[0003] The current mainstream microwave digestion instrument sample rack generally adopts modular design, and each digestion tank is connected to the sample rack main body through an independent explosion-proof pipe. In the traditional design, the explosion-proof pipe needs to be manually pressed by the experimental personnel and inserted into the sample rack. This operation mode exposes significant defects in the long-term use process: first, manual operation requires a large pressure, which can easily cause the operator to be tired, and there is an installation problem caused by uneven operation force; second, under the action of high-frequency mechanical stress, plastic deformation occurs at the contact part of the explosion-proof pipe and the sample rack, especially when using high molecular materials such as polytetrafluoroethylene (PTFE), the edge of the pipe opening is prone to rolling and warping.

[0004] The above problems have become a technical bottleneck restricting the long-term stable operation of the microwave digestion instrument. Experimental data shows that after more than 500 cycles, 68% of the sample racks have difficulty in installing the explosion-proof pipe, of which 32% cause the digestion liquid to leak due to sealing failure, directly affecting the accuracy of the detection result. More seriously, the leakage in the high-pressure environment may cause safety accidents and threaten the personal safety of the experimental personnel.

[0005] The existing improvement schemes are mostly focused on material replacement or local structure optimization, such as using carbon fiber reinforced composite materials to improve fatigue resistance, or adding a sealing ring at the interface to assist sealing. However, these methods fail to fundamentally solve the mechanical stress problem caused by manual operation, and increase the manufacturing cost and maintenance complexity.

[0006] Therefore, it is necessary to develop a new microwave digestion instrument sample rack. CONTENT OF THE INVENTION

[0007] In order to improve the problem of pipe opening deformation of the explosion-proof pipe after long-term use, the present application provides a sample rack for a microwave digestion instrument.

[0008] The sample rack for a microwave digestion instrument provided by the present application adopts the following technical scheme:

[0009] The utility model provides a sample frame for microwave digestion instrument, its characterized in being: including upper plate body, lower plate body, the upper surface of lower plate body forms the positioning groove, the upper surface of lower plate body forms the connecting portion, the upper plate body is rotationally connected with locking piece, locking piece is connected with connecting portion threadedly, the upper plate body has the guide piece, the guide piece is matched with connecting portion and is limited the rotation of upper plate body.

[0010] Through the above technical scheme, the bottom of the explosion-proof pipe is inserted into the positioning groove, and then the locking piece is rotated to drive the upper plate body to move downward and abut against the top of the explosion-proof pipe, so that the explosion-proof pipe is quickly fixed through the clamping of the upper plate body and the lower plate body.

[0011] Optionally, the guide piece is a guide sleeve fixed to the lower surface of the lower plate body, and part of the guide sleeve is sleeved outside the connecting portion and slidably matched with the connecting portion.

[0012] Optionally, the locking piece includes a screw rod, a smooth rod fixed to the screw rod, a lower positioning ring fixed to the smooth rod, and an upper positioning ring integrally formed with or detachably connected with the smooth rod; the smooth rod and the screw rod are coaxially arranged, a circular hole is formed in the center of the upper plate body for the smooth rod to pass through, the lower positioning ring abuts against the lower surface of the upper plate body, and the upper positioning ring abuts against the upper surface of the upper plate body.

[0013] Optionally, the upper positioning ring can axially move relative to the smooth rod when sleeved on the smooth rod, a limiting protrusion is formed on the smooth rod, and a limiting groove is formed in the upper positioning ring.

[0014] Through the above technical scheme, the upper positioning ring drives the screw rod to rotate through the limiting protrusion and the limiting groove, and this way facilitates the disassembly of the upper positioning ring.

[0015] Optionally, a pin hole is formed in the smooth rod, a positioning pin is inserted into the pin hole, and the positioning pin abuts against the upper positioning ring.

[0016] Through the above technical scheme, the positioning pin can prevent the upper positioning ring from being detached, and the positioning pin can also not be provided.

[0017] Optionally, external threads are formed in the smooth rod, and internal threads are formed in the upper positioning ring, and the upper positioning ring is connected with the external threads on the smooth rod.

[0018] Through the above technical scheme, the upper positioning ring can also be installed in a threaded connection manner.

[0019] Optionally, an annular groove is formed in the lower surface of the upper plate body, a rubber ring is embedded in the annular groove, and the rubber ring is located directly above the positioning groove.

[0020] By adopting the technical scheme, the rubber ring is arranged, so that the explosion-proof tube is not easy to be damaged and is clamped more tightly.

[0021] Optionally, the connecting part is located at the center position of the lower plate body, and the locking part is correspondingly arranged at the center position of the upper plate body.

[0022] By adopting the technical scheme, the structure is stable.

[0023] Optionally, the lower plate body is fixed with a counterweight at the bottom. By adopting the technical scheme, the sample rack is not easy to be overturned, and the structure is stable.

[0024] To sum up, the present application has at least one of the following beneficial technical effects:

[0025] The sample container is accurately positioned through the positioning groove, the upper and lower plate bodies are quickly fixed through the threaded cooperation of the connecting part and the locking part, the guiding part limits the rotation of the upper plate body, the overall structure of the sample rack is stable and reliable, the operation is convenient and efficient, and the edge of the pipe opening of the explosion-proof tube is not rolled. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic view of the overall structure of the embodiment of the present application;

[0027] Figure 2 is a schematic view of the longitudinal section structure of the embodiment of the present application; Figure 1

[0028] Figure 3 is a schematic view of the structure of the locking part.

[0029] Reference signs: 1, upper plate body; 2, lower plate body; 3, positioning groove; 4, connecting part; 5, counterweight; 6, threaded hole; 7, guiding sleeve; 8, screw rod; 9, smooth rod; 10, lower positioning ring; 11, upper positioning ring; 12, circular hole; 13, limiting protrusion; 14, limiting groove; 15, annular groove; 16, rubber ring; 17, pin hole. DETAILED DESCRIPTION

[0030] The following will be described in detail in combination with the accompanying drawings. Figures 1-3 The present application will be further described in detail.

[0031] The embodiment of the present application discloses a sample rack for a microwave digestion instrument, which comprises an upper plate body 1 and a lower plate body 2, the upper surface of the lower plate body 2 is formed with a positioning groove 3, the upper surface of the lower plate body 2 is formed with a connecting part 4, the upper plate body 1 is rotationally connected with a locking part, the locking part is threadedly connected with the connecting part 4, the upper plate body 1 is provided with a guiding part, and the guiding part is matched with the connecting part 4 to limit the rotation of the upper plate body 1.

[0032] ​Specifically, the upper plate body 1 and the lower plate body 2 are both disc structures. Generally, in order to make the sample rack structure more stable, the diameter of the lower plate body 2 can be larger than that of the upper plate body 1. However, in the present scheme, the stability of the whole sample rack is achieved by fixing the counterweight 5 at the bottom of the lower plate body 2. Therefore, in the present embodiment, the diameters of the upper plate body 1 and the lower plate body 2 are the same. A counterweight groove can be formed at the bottom of the lower plate body 2, and the counterweight 5 is bonded in the counterweight groove. The counterweight 5 can be made of stainless steel plate or stainless steel sheet.

[0033] The cross section of the connecting part 4 is non-circular. The connecting part 4 is located at the center of the lower plate body 2. A threaded hole 6 is formed at the center of the connecting part 4. A locking member is correspondingly arranged at the center of the upper plate body 1. The guide member is a guide sleeve 7 which is fixed to the lower surface of the lower plate body 2. Part of the guide sleeve 7 is sleeved on the connecting part 4 and is in sliding fit with the connecting part 4.

[0034] The locking member includes a screw rod 8, a smooth rod 9 fixed on the screw rod 8, a lower positioning ring 10 fixed on the smooth rod 9, and an upper positioning ring 11 which is integrally formed with or detachably connected to the smooth rod 9. The smooth rod 9 and the screw rod 8 are coaxially arranged. A circular hole 12 is formed at the center of the upper plate body 1 for the smooth rod 9 to pass through. The lower positioning ring 10 abuts against the lower surface of the upper plate body 1, and the upper positioning ring 11 abuts against the upper surface of the upper plate body 1.

[0035] The upper positioning ring 11 can be integrally formed with the smooth rod 9, but in order to facilitate the disassembly and assembly of the whole sample rack, the upper positioning ring 11 is sleeved on the smooth rod 9 and can move axially relative to the smooth rod 9. A limiting protrusion 13 is formed on the smooth rod 9, and a limiting groove 14 is formed in the upper positioning ring 11. In this way, the upper positioning ring 11 can drive the smooth rod 9 to rotate through the cooperation of the limiting protrusion 13 and the limiting groove 14. A pin hole 17 is formed on the smooth rod 9, and a positioning pin is inserted into the pin hole 17. The positioning pin can be an R pin or a cylindrical pin. The positioning pin abuts against the upper positioning ring 11.

[0036] In order to fix the explosion-proof pipe more stably, an annular groove 15 is formed on the lower surface of the upper plate body 1, and a rubber ring 16 is embedded in the annular groove 15. The rubber ring 16 is located directly above the positioning groove 3.

[0037] In use, the bottom of the plurality of explosion-proof pipes is first inserted into the positioning groove 3, then the guide sleeve 7 is sleeved on the connecting part 4, the upper plate body 1 is pressed downward, and the screw rod 8 is inserted into the threaded hole 6 of the connecting part 4. Then, the upper positioning ring 11 is rotated, so that the rubber ring 16 of the upper plate body 1 abuts against the upper end of the explosion-proof pipe.

[0038] Embodiment 2; the difference from embodiment 1 is that the smooth rod 9 is provided with external threads, and the upper positioning ring 11 is provided with internal threads, and the upper positioning ring 11 is connected with the external threads of the smooth rod 9. In the description of the utility model, it needs to be understood that the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, and a particular orientation configuration and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0039] In the description of the utility model, it needs to be explained that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] The above is only the embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process transformation made by using the contents of the utility model specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection range of the utility model.

Claims

1. A sample holder for a microwave digestion instrument, characterized by: The upper plate body and the lower plate body are provided with positioning grooves on the upper surface of the lower plate body, and connecting portions on the upper surface of the lower plate body, the upper plate body is provided with a locking member rotatably connected to the upper plate body, the locking member is threadedly connected to the connecting portion, the upper plate body is provided with a guide member, and the guide member is matched with the connecting portion to limit the rotation of the upper plate body.

2. The sample holder for a microwave digestion instrument of claim 1, wherein: The guide member is a guide sleeve fixed to the lower surface of the lower plate body, and the guide sleeve is partially sleeved on the connecting portion and slidably matched with the connecting portion.

3. The sample holder for a microwave digestion instrument of claim 1, wherein: The locking member comprises a screw rod, a smooth rod fixed to the screw rod, a lower positioning ring fixed to the smooth rod, and an upper positioning ring integrally formed with or detachably connected to the smooth rod, the smooth rod and the screw rod are coaxially arranged, a circular hole is formed in the center of the upper plate body for the smooth rod to pass through, the lower positioning ring abuts against the lower surface of the upper plate body, and the upper positioning ring abuts against the upper surface of the upper plate body.

4. The sample holder for a microwave digestion instrument of claim 3, wherein: The upper positioning ring is sleeved on the smooth rod and can axially move relative to the smooth rod, a limiting protrusion is formed on the smooth rod, and a limiting groove is formed in the upper positioning ring.

5. The sample holder for a microwave digestion instrument of claim 4, wherein: A pin hole is formed in the smooth rod, a positioning pin is inserted into the pin hole, and the positioning pin abuts against the upper positioning ring.

6. The sample holder for a microwave digestion instrument of claim 3, wherein: An external thread is formed on the smooth rod, and an internal thread is formed in the upper positioning ring, and the upper positioning ring is connected to the external thread on the smooth rod.

7. The sample holder for a microwave digestion instrument of claim 1, wherein: The lower surface of the upper plate body is provided with an annular groove, and a rubber ring is embedded in the annular groove, and the rubber ring is located directly above the positioning groove.

8. The sample holder for a microwave digestion instrument of claim 1, wherein: The connecting portion is located at the center of the lower plate body, and the locking member is correspondingly arranged at the center of the upper plate body.

9. The sample holder for a microwave digestion instrument of claim 1, wherein: A counterweight is fixed to the bottom of the lower plate body.

Images