An apparatus for the directional filling of a capillary melting point apparatus for flocculated samples

Abstract

The utility model relates to a kind of directional filling device for flocculent sample's capillary melting point instrument, belong to chemical experiment instrument technical field, solve the problem that the existing directional filling device is difficult to load or the problem of poor filling efficiency due to flocculent sample fluffy, easy to wind characteristics lead to sample loading difficulty.The utility model includes backplate, sample pretreatment mechanism, filling mechanism and clamping mechanism, sample pretreatment mechanism is inclinedly arranged with horizontal plane, including feed tank and the needle plate that can comb flocculent sample in tank;Filling mechanism includes the propelling rod that can push out after combing sample;Clamping mechanism includes the feeding head for butt joint with capillary tube orifice and the holder for fixing capillary tube.The utility model can realize the combing and directional filling of flocculent sample, sample loading is compact, uniform, and sample loading efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of chemical experimental instrument technology, and in particular to a directional filling device for a capillary melting point apparatus for flocculent samples. Background Technology

[0002] Melting point determination is one of the core methods for identifying the purity and properties of substances in fields such as chemistry, pharmaceuticals, and materials science. Among these methods, the capillary method has become a routinely used method in laboratories due to its advantages such as ease of operation, low cost, and wide applicability. The key requirement for melting point determination using the capillary method is to uniformly and tightly fill the capillary tube with the sample, ensuring no gaps and a consistent filling height. This guarantees uniform heat transfer during heating, resulting in accurate and repeatable melting point data, providing a reliable basis for substance identification.

[0003] To meet the aforementioned sample loading requirements, various capillary directional filling devices have emerged in the prior art. These devices achieve sample compaction through a combination of vibration and pressing, employing a dual compaction structure of eccentric reciprocating mechanism and vibration device to further improve the filling effect of powder samples. Some devices also use guide holes to allow the capillary to fall freely, relying on inertia to achieve natural sample compaction. However, the core design of these existing directional filling devices is designed for powdery samples with good flowability. For flocculent or fibrous samples, the inherent characteristics of the samples—loose texture, easy fiber entanglement, and poor flowability—make existing devices unsuitable. On the one hand, flocculent samples cannot smoothly enter the narrow opening of the capillary through vibration or inertia, easily entangled and accumulating at the opening, causing blockage and making sample loading difficult. On the other hand, even if some sample manages to enter the capillary, the disordered distribution of fibers creates numerous voids, resulting in inconsistent sample filling height and compaction, which in turn causes uneven heat transfer during heating, ultimately affecting the accuracy and repeatability of melting point measurement results.

[0004] In practical applications such as chemical, pharmaceutical and materials research and development, there is an increasing demand for melting point determination of flocculent and fibrous samples. However, the limitations of existing directional filling devices make the melting point determination of such samples inefficient and unreliable. Utility Model Content

[0005] In view of the above problem analysis, the present invention aims to design a directional filling device for a capillary melting point apparatus for flocculent samples, so as to solve the problem that existing directional filling devices are difficult to load or have voids inside the sample due to the fluffy and easy-to-entangle characteristics of flocculent samples.

[0006] The objective of this utility model is mainly achieved through the following technical solutions:

[0007] A directional filling device for a capillary melting point apparatus for flocculent samples includes a sample pretreatment mechanism, a filling mechanism, and a clamping mechanism. The sample pretreatment mechanism is used to comb and orient the flocculent sample. The filling mechanism is used to push the pretreated sample to the clamping mechanism.

[0008] The sample pretreatment mechanism is inclined to the horizontal plane and includes a feed trough for holding the sample and a needle plate for combing the flocculent sample in the trough; the filling mechanism includes a push rod for pushing the pretreated sample out; the clamping mechanism includes a feeding head for docking with the capillary tube opening and a clamp for fixing the capillary tube.

[0009] Furthermore, the sample pretreatment mechanism also includes a drive motor, a screw, a chute, and a feed inlet; the drive motor drives the screw to rotate in the feed chute; the needle plate is threadedly connected to the screw, and the two sides of the needle plate are provided with sliders that cooperate with the chute, so that the drive motor can drive the needle plate to reciprocate linearly along the screw axis, and the feed chute has a feed inlet at one end near the filling mechanism.

[0010] Furthermore, the sample pretreatment mechanism also includes a conveyor belt and a transmission motor for driving the conveyor belt, and the needle plate is fixedly disposed above the conveyor belt conveying path.

[0011] Furthermore, it also includes an auxiliary compaction mechanism, which is disposed below the clamping mechanism, and the auxiliary compaction mechanism is a piezoelectric ceramic vibrating plate.

[0012] Furthermore, the filling mechanism includes a crank, a connecting rod, and a guide sleeve; the crank is hinged to the push rod via the connecting rod; the push rod passes through the guide sleeve.

[0013] Furthermore, the axis of the push rod is collinear with the central axis of the feed inlet.

[0014] Furthermore, the sample pretreatment mechanism is tilted at an angle of 15° to 20° to the horizontal plane.

[0015] Furthermore, it also includes a back plate, on which the sample pretreatment mechanism, filling mechanism and clamping mechanism are placed.

[0016] Furthermore, there are multiple clamps, and the feed head is funnel-shaped.

[0017] Furthermore, the feed trough is a U-shaped trough, and the top of the feed trough is provided with an outwardly folded baffle.

[0018] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0019] (1) By setting up a sample pretreatment mechanism that is inclined to the horizontal plane, combined with the internal needle plate combing function, the fluffy and easily tangled flocculent sample can be effectively combed and the fiber orientation can be initially oriented and pre-compressed, reducing the difficulty of flocculent sample being filled into the narrow capillary tube opening smoothly and tightly due to its own characteristics; the three major functional modules of sample pretreatment, orientation pushing and capillary positioning and fixing are integrated into one, forming a continuous and smooth operation process. Users do not need to switch between multiple devices or tools, simplifying the operation steps and improving the overall sample loading efficiency of flocculent sample.

[0020] (2) By adding an independent auxiliary compaction mechanism, high-frequency micro-amplitude vibration is applied after the sample is initially pushed into the capillary tube, which promotes further sedimentation and optimized arrangement of the sample in the tube. This subsequent compaction step reduces the voids that may be generated due to fiber entanglement or the pushing process, ensuring that the sample column reaches a highly uniform and compact state.

[0021] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained from the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0022] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0023] Figure 1 This is a schematic diagram (a) of the overall structure of the filling device in Embodiment 1;

[0024] Figure 2 This is a schematic diagram (II) of the overall structure of the filling device in Embodiment 1;

[0025] Figure 3 This is a schematic diagram of the sample pretreatment mechanism of the filling device in Embodiment 1;

[0026] Figure 4 This is a schematic diagram of the structure of the filling mechanism of the filling device in Embodiment 1;

[0027] Figure 5 This is a schematic diagram of the clamping mechanism of the filling device in Embodiment 1;

[0028] Figure 6 This is a schematic diagram (a) of the sample pretreatment mechanism of the filling device in Example 2;

[0029] Figure 7This is a schematic diagram (II) of the structure of the sample pretreatment mechanism of the filling device in Example 2.

[0030] Figure label:

[0031] 1-Back plate; 2-Sample pretreatment mechanism; 21-Feeding motor; 22-Needle plate; 23-Feeding trough; 24-Screw; 25-Groove; 26-Feeding port; 27-Conveyor belt; 28-Conveyor motor; 3-Filling mechanism; 31-Crank; 32-Connecting rod; 33-Guide sleeve; 34-Propeller rod; 4-Clamping mechanism; 41-Feeding head; 42-Clamper; 5-Auxiliary compaction mechanism. Detailed Implementation

[0032] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0033] Example 1

[0034] Specific embodiments of this utility model, such as Figure 1 and Figure 2 As shown, this utility model relates to a directional filling device (hereinafter referred to as "filling device") for a capillary melting point apparatus for flocculent samples. The filling device includes a sample pretreatment mechanism 2, a filling mechanism 3, and a clamping mechanism 4. The filling device is assembled with the sample pretreatment mechanism 2, the filling mechanism 3, and the clamping mechanism 4 in sequence to form a stable sample filling device.

[0035] Specifically, such as Figure 3As shown, the sample pretreatment mechanism 2 serves as the initial processing unit for flocculent samples, realizing sample combing and pre-compression functions. The sample pretreatment mechanism 2 forms an angle with the horizontal plane, using gravity assistance to gather the combed sample towards the filling end. The angle is preferably 15° to 20°. The sample pretreatment mechanism 2 includes a feeding motor 21, a needle plate 22, a feeding trough 23, a screw 24, a chute 25, and a discharge port 26. The feeding trough 23 is a U-shaped trough made of stainless steel, and the top opening of the feeding trough 23 is equipped with... The outward-folding flange reduces sample spillage during combing; both ends of the screw 24 are inserted into the side walls of the feed trough 23, and the screw 24 is rotatably connected to the feed trough 23; the end of the screw 24 near the feed motor 21 extends out of the side wall of the feed trough 23 and is rigidly connected to the output shaft of the feed motor 21 through a coupling; the feed motor 21 is fixed on the motor bracket at the end of the feed trough 23, and the feed motor 21 can be reversed and its speed adjusted by an external controller, thereby driving the screw 24 to rotate in both directions. The needle plate 22 includes a base plate and multiple needles. The needles are evenly distributed in a matrix on the lower surface of the base plate to ensure that the combing covers the entire cross-section of the feed trough 23. The needle plate 22 has an internal threaded hole adapted to the screw 24, and engages with the screw 24 through the thread. The needle plate 22 has sliders on both sides that match the slide groove 25, and the needle plate 22 slides along the slide groove 25. When the feed motor 21 drives the screw 24 to rotate forward or reverse, the needle plate 22 reciprocates linearly along the axis of the screw 24 under the guidance of the threaded transmission and the slide groove 25. The needle plate 22 penetrates into the interior of the flocculent sample, combs the loose and entangled fibers to a consistent orientation, and initially compresses the sample volume, laying the foundation for subsequent filling. The discharge port 26 is opened at the end wall of the feed trough 23 near the filling mechanism 3. The discharge port 26 is a rectangular inlet with smooth rounded corners formed by grinding and polishing the inlet edge to avoid scratching the combed sample. The central axis of the feed port 26 is aligned with the filling mechanism 3 to ensure that the combed sample enters the filling device without residue or displacement.

[0036] like Figure 4 As shown, the filling mechanism 3 is adjacent to the discharge port 26. The filling mechanism 3 can directionally push the pretreated sample to the clamping mechanism 4. The filling mechanism 3 includes a crank 31, a connecting rod 32, a guide sleeve 33 and a push rod 34. The axis of the push rod 34 is collinear with the central axis of the feed port 26. One end of the crank 31 is fixedly connected to the output shaft of a micro motor (not shown in the figure). The other end of the crank 31 is hinged to the connecting rod 32 through a pin. The connecting rod 32 is hinged to the push rod 34. The rod body of the push rod 34 is supported and guided by the guide sleeve 33 to ensure that the push rod 34 moves back and forth in a straight line. The push rod 34 extends through the guide sleeve 33 into the clamping mechanism 4 to ensure that the accumulated sample is pushed into the capillary.

[0037] The clamping mechanism 4 is used to fix the capillary tube for melting point determination. The clamping mechanism 4 includes a feeding head 41 and a clamp 42. The clamp 42 can clamp the capillary tube and make the capillary tube opening vertically upward. It usually includes one or more clamps 42. The feeding head 41 is provided directly above the clamp 42. Preferably, the feeding head 41 is funnel-shaped. The lower end of the feeding head 41 is tightly connected to the capillary tube inlet. The upper end of the feeding head 41 is used to receive the sample. The push rod 34 pushes the sample from the feed trough 23 through the outlet 26 after being combed into the feeding head 41. The sample enters the clamped capillary tube under the action of gravity and pushing force.

[0038] Furthermore, such as Figure 5 As shown, an auxiliary compaction mechanism 5 is provided below the clamping mechanism 4. The auxiliary compaction mechanism 5 is a piezoelectric ceramic vibrating plate, which contacts the clamping part that fixes the capillary. After the sample is initially filled into the capillary, the auxiliary compaction mechanism 5 is activated to generate high-frequency micro-amplitude vibration, which further adjusts the position and settles the sample in the capillary under the action of vibration, thereby eliminating any voids that may be generated during the filling process and ensuring the uniformity and compactness of the sample column.

[0039] Furthermore, the filling device also includes a back plate 1. The overall structure of the filling device is based on the back plate 1 as a supporting component. A sample pretreatment mechanism 2, a filling mechanism 3, and a clamping mechanism 4 are sequentially mounted on the back plate 1 along the sample processing flow. The sample pretreatment mechanism 2, the filling mechanism 3, and the clamping mechanism 4 are fixedly connected to the pre-set mounting holes on the surface of the back plate 1 by bolts, forming a stable sample filling device. The sample pretreatment mechanism 2 is fixed to the left side of the back plate 1 by a metal bracket, the filling mechanism 3 is installed in the middle of the back plate 1, and the clamping mechanism 4 is installed in the right side of the back plate 1.

[0040] In use, place the flocculent sample to be tested into the feed trough 23, start the feed motor 21, and drive the needle plate 22 to reciprocate combing the sample to make it regular and compact. Fix the capillary vertically with the clamp 42, ensuring that the capillary opening is aligned and close to the lower port of the feed head 41. Start the filling mechanism 3 to move the push rod 34 and push the combed sample from the outlet 26 through the feed head 41 into the capillary. After the sample is initially filled, start the auxiliary compaction mechanism 5 to briefly vibrate the capillary to compact the sample inside. After the vibration stops, release the clamp 42 and take out the capillary that has been uniformly filled with the sample. It can then be used for melting point determination.

[0041] Example 2

[0042] Specific embodiments of this utility model are as follows: Figure 6 and Figure 7As shown, compared with Example 1, the improvement is that the sample pretreatment mechanism 2 uses a conveyor belt to transport the sample, which is suitable for scenarios that require continuous or batch processing of flocculent samples and improves sample loading efficiency.

[0043] The bottom of the sample pretreatment mechanism 2 is also equipped with a conveyor belt 27 and a conveyor motor 28. The conveyor motor 28 drives the drive roller of the conveyor belt 27, and drives the conveyor belt 27 to move at a constant speed. The surface of the conveyor belt 27 is designed with protrusions or textures to increase the friction with the flocculent sample. The needle teeth of the needle plate 22 extend slightly into the sample layer on the surface of the conveyor belt 27. The discharge port 26 is located below the lower end of the conveyor belt 27. The conveyor belt 27 can realize continuous feeding, combing and feeding of samples, with high sample loading efficiency, which is suitable for the melting point determination of batch samples.

[0044] Furthermore, the needle plate 22 is fixedly installed above the conveyor belt 27. The flocculent sample to be processed is placed at the starting end of the conveyor belt 27. As the conveyor belt 27 moves, the sample is automatically combed when it passes under the fixed needle plate 22. The combed sample is then conveyed to the discharge port 26 and then enters the filling mechanism 3 and the clamping mechanism 4 for sample filling.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A directional filling device for a capillary melting point apparatus for flocculent samples, characterized in that, It includes a sample pretreatment mechanism (2), a filling mechanism (3) and a clamping mechanism (4). The sample pretreatment mechanism (2) is used to comb and orient the flocculent sample; the filling mechanism (3) is used to push the pretreated sample to the clamping mechanism (4). The sample pretreatment mechanism (2) is inclined to the horizontal plane. The sample pretreatment mechanism (2) includes a feed trough (23) for holding the sample and a needle plate (22) for combing the flocculent sample in the trough. The filling mechanism (3) includes a push rod (34) for pushing the pretreated sample out. The clamping mechanism (4) includes a feed head (41) for docking with the capillary tube opening and a clamp (42) for fixing the capillary tube.

2. The directional filling device for a capillary melting point apparatus for flocculent samples according to claim 1, characterized in that, The sample pretreatment mechanism (2) further includes a drive motor (21), a screw (24), a slide groove (25), and a feed inlet (26); the drive motor (21) drives the screw (24) to rotate in the feed groove (23); the needle plate (22) is threadedly connected to the screw (24), and the two sides of the needle plate (22) are provided with sliders that cooperate with the slide groove (25), so that the drive motor (21) can drive the needle plate (22) to reciprocate linearly along the axis of the screw (24), and the feed groove (23) has a feed inlet (26) at one end near the filling mechanism (3).

3. The directional filling device for a capillary melting point apparatus for flocculent samples according to claim 1, characterized in that, The sample pretreatment mechanism (2) also includes a conveyor belt (27) and a transmission motor (28) for driving the conveyor belt (27) to move. The needle plate (22) is fixedly arranged above the conveyor belt (27) conveying path.

4. The directional filling device for a capillary melting point apparatus for flocculent samples according to claim 1, characterized in that, It also includes an auxiliary compaction mechanism (5), which is located below the clamping mechanism (4) and is a piezoelectric ceramic vibrating plate.

5. The directional filling device for a capillary melting point apparatus for flocculent samples according to claim 1, characterized in that, The filling mechanism (3) includes a crank (31), a connecting rod (32) and a guide sleeve (33); the crank (31) is hinged to the push rod (34) through the connecting rod (32); the push rod (34) passes through the guide sleeve (33).

6. The directional filling device for a capillary melting point apparatus for flocculent samples according to claim 2, characterized in that, The axis of the push rod (34) is collinear with the central axis of the feed inlet (26).

7. The directional filling device for a capillary melting point apparatus for flocculent samples according to claim 1, characterized in that, The sample pretreatment mechanism (2) is tilted at an angle of 15° to 20° to the horizontal plane.

8. The directional filling device for a capillary melting point apparatus for flocculent samples according to claim 1, characterized in that, It also includes a back plate (1), on which the sample pretreatment mechanism (2), filling mechanism (3) and clamping mechanism (4) are placed.

9. The directional filling device for a capillary melting point apparatus for flocculent samples according to claim 1, characterized in that, There are multiple clamps (42), and the feeding head (41) is funnel-shaped.

10. The directional filling device for a capillary melting point apparatus for flocculent samples according to any one of claims 1-9, characterized in that, The feed trough (23) is a U-shaped trough, and the top of the feed trough (23) is provided with an outwardly folded baffle.

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