Liquid nitrogen grinding device capable of rapidly cooling

Abstract

The liquid nitrogen grinding device comprises a base, a grinding tank is mounted at the top of the base, an opening is formed in the top of an inner cavity of the grinding tank, a tank cover is mounted at the top of the inner cavity of the grinding tank, a grinding inner container internally provided with grinding balls is arranged in the inner cavity of the grinding tank, and the grinding inner container is driven by a motor to rotate; the axis of the grinding inner container and the axis of the grinding tank are centered, and the outer wall of the grinding inner container and the inner wall of the grinding tank are opposite to form a cooling cavity. The grinding inner container is directly cooled through liquid nitrogen, cooling of the grinding inner container can be accelerated through the conduction fins on the outer wall of the grinding inner container, so that a sample in the grinding inner container is rapidly cooled, the liquid nitrogen in the cooling cavity is still used for cooling the grinding inner container during grinding, and the grinding efficiency is improved. The low-temperature grinding device is simple in step, convenient to operate and beneficial to improving the actual grinding effect of the sample, and the low-temperature grinding device is simple in step, convenient to operate and beneficial to improving the actual grinding efficiency.

Description

Technical Field

[0001] This application relates to the field of liquid nitrogen grinding technology, specifically to a grinding apparatus. Background Technology

[0002] Liquid nitrogen grinding is widely used in the crushing, preparation, and analysis of various materials and particles in many fields. For example, in the food and pharmaceutical industries, liquid nitrogen can be used to avoid problems such as component deactivation, oxidative deterioration, and pollution hazards caused by sample heating. In environmental analysis, liquid nitrogen grinding can improve the analyzability and sublimation rate of samples. In chemical analysis and physical experiments, liquid nitrogen grinding can be used to prepare and crush crystalline samples.

[0003] The prior art discloses a liquid nitrogen grinding device for preventing frostbite, including a mortar, a grinding rod, a mortar cover and a base; the mortar cover has a hole in the middle, the upper end of the grinding rod passes through the hole and is connected to the mortar cover through a grinding rod sleeve, and the base has a recessed hole in the middle for placing the mortar, and the mortar is placed in the recessed hole in the middle of the base.

[0004] The above-mentioned liquid nitrogen grinding device still has shortcomings in actual use. For example, it is necessary to first place the sample in a liquid nitrogen container for freezing, and then place the sample in a mortar for grinding. This operation is cumbersome and has low grinding efficiency. Moreover, the freezing effect of the sample will be affected during the sample transfer, making it difficult to cool the sample quickly, which may affect the actual grinding effect of the sample. Utility Model Content

[0005] Therefore, this application provides a liquid nitrogen grinding device that can be rapidly cooled to solve the problems of the prior art, such as cumbersome operation steps, low grinding efficiency, difficulty in rapidly cooling the sample, and potential impact on the actual grinding effect of the sample.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A liquid nitrogen grinding device with rapid cooling includes a base, a grinding jar mounted on the top of the base, an open top cavity of the grinding jar with a lid, a grinding inner liner containing grinding balls inside the grinding jar, the grinding inner liner being driven to rotate by a motor, the axis of the grinding inner liner being aligned with the axis of the grinding jar, and the outer wall of the grinding inner liner being opposite to the inner wall of the grinding jar to form a cooling chamber, and a liquid nitrogen injection pipe mounted on the outside of the grinding jar, one end of the liquid nitrogen injection pipe extending into the grinding jar and communicating with the cooling chamber;

[0008] The outer wall of the grinding liner is fitted with evenly distributed conductive fins, and there is a gap between the other end of the conductive fins and the inner wall of the grinding jar.

[0009] Optionally, the motor is installed in the base, the output shaft of the motor faces upward and is provided with a connecting rod, the bottom end of the grinding inner container is provided with a connecting block, the end of the connecting rod away from the motor extends upward into the cooling cavity and is detachably connected with the connecting block.

[0010] Further optionally, the base and the grinding tank are both provided with a movable hole matched with the connecting rod, the lower end of the connecting rod is cylindrical and is rotatably installed in the movable hole, the upper end of the connecting rod extends into the cooling cavity and is prismatic, the bottom of the connecting block is provided with a polygonal slot matched with the upper end of the connecting rod, and the upper end of the connecting rod is insertedly assembled with the connecting block through the polygonal slot.

[0011] Optionally, the opening inner diameter of the grinding tank is larger than the inner cavity inner diameter to form a stepped shape, the upper end outer wall of the grinding inner container is rotatably sleeved with a limiting plate, the limiting plate is detachably assembled in the opening of the grinding tank, the bottom of the tank cover is provided with a threaded tube, the threaded tube is threadedly connected with the inner wall of the opening of the grinding tank, and the lower end surface of the threaded tube is pressed on the upper end surface of the limiting plate.

[0012] Further optionally, the bottom of the tank cover is rotatably provided with an inner cover in the inner circle of the threaded tube, and the inner cover covers the upper end opening end surface of the grinding inner container.

[0013] Further optionally, the lower end surface of the limiting plate is provided with a sealing ring, the sealing ring is sleeved on the periphery of the grinding inner container and has a gap with the grinding inner container, and the outer peripheral surface of the sealing ring is tightly attached to the inner wall of the grinding tank.

[0014] Further optionally, the sealing ring is an annular rubber sealing ring.

[0015] Compared with the prior art, the application has at least the following beneficial effects:

[0016] The liquid nitrogen injection pipe is connected with the liquid nitrogen supply device, so that the liquid nitrogen is injected into the cooling cavity through the liquid nitrogen injection pipe, the grinding inner container is directly cooled by the liquid nitrogen, the cooling of the grinding inner container is accelerated by the evenly distributed conduction fins on the outer wall of the grinding inner container, so that the sample in the grinding inner container is rapidly cooled, the grinding inner container is driven to rotate by the motor, the sample is ground by the movement of the grinding balls in the grinding inner container, and the liquid nitrogen in the cooling cavity continues to cool the grinding inner container during grinding, so as to ensure that the sample remains at low temperature during grinding, which is beneficial to improve the actual grinding effect of the sample, and the steps are simple and convenient to operate, which is helpful to improve the actual grinding efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more intuitively illustrate the prior art and the present application, exemplary drawings are given below. It should be understood that the specific shapes, structures shown in the drawings should not be considered as limiting conditions in the implementation of the present application; for example, based on the technical concepts disclosed in the present application and the exemplary drawings, those skilled in the art can easily make routine adjustments or further optimizations to the increase / decrease / assignment of certain units (components), specific shapes, positional relationships, connection methods, size ratio relationships, etc.

[0018] Figure 1 An external structure schematic diagram of a liquid nitrogen grinding device capable of rapid cooling provided for an embodiment of the present application;

[0019] Figure 2 A cross-sectional structure schematic diagram of a liquid nitrogen grinding device capable of rapid cooling provided for an embodiment of the present application;

[0020] Figure 3 A structure schematic diagram of a grinding inner container of a liquid nitrogen grinding device capable of rapid cooling provided for an embodiment of the present application.

[0021] Legend of reference signs:

[0022] 1, base; 2, grinding pot; 3, pot cover; 4, liquid nitrogen injection pipe; 5, grinding inner container; 6, motor; 7, conduction fin; 8, connecting block; 9, connecting rod; 10, limiting plate; 11, threaded pipe; 12, inner cover; 13, sealing ring. DETAILED DESCRIPTION

[0023] The present application will be further described in detail below by specific embodiments in combination with the accompanying drawings.

[0024] In one embodiment, as shown in Figures 1-3 a liquid nitrogen grinding device capable of rapid cooling, comprising a base 1, a grinding pot 2 is installed on the top of the base 1, the grinding pot 2 is made of stainless steel, the inner cavity of the grinding pot 2 is open at the top and is installed with a pot cover 3, a grinding inner container 5 with built-in grinding balls is arranged in the inner cavity of the grinding pot 2, the grinding inner container 5 is made of aluminum alloy, which can quickly conduct cooling while preventing brittle or rupture in a low temperature environment, and the grinding inner container 5 is driven to rotate by a motor 6, the axis of the grinding inner container 5 is centered with the axis of the grinding pot 2, and the outer wall of the grinding inner container 5 is opposite to the inner wall of the grinding pot 2 to form a cooling cavity, a liquid nitrogen injection pipe 4 is installed outside the grinding pot 2, one end of the liquid nitrogen injection pipe 4 extends into the grinding pot 2 and is in communication with the cooling cavity, the other end of the liquid nitrogen injection pipe 4 is located outside the grinding pot 2 and is connected with a liquid nitrogen supply device;

[0025] The outer wall of the grinding inner container 5 is provided with uniformly distributed conductive fins 7, the conductive fins 7 are aluminum alloy fins, and the other end of the conductive fins 7 is in a gap with the inner wall of the grinding tank 2, which does not affect the rotation centrifugal grinding of the grinding inner container 5.

[0026] The liquid nitrogen injection pipe 4 is connected with the liquid nitrogen supply device, so that the liquid nitrogen is injected into the cooling cavity through the liquid nitrogen injection pipe 4, and the grinding inner container 5 is directly cooled by the liquid nitrogen, and at the same time, the uniformly distributed conductive fins 7 on the outer wall of the grinding inner container 5 can accelerate the cooling of the grinding inner container 5, so as to quickly cool the sample in the grinding inner container 5, and then the grinding inner container 5 is driven to rotate by the motor 6, and the sample is ground by the movement of the grinding balls in the grinding inner container 5, and at the same time of grinding, the liquid nitrogen in the cooling cavity still cools the grinding inner container 5, so as to ensure that the sample remains at low temperature during grinding, which is beneficial to improve the actual grinding effect of the sample, and the steps are simple and convenient to operate, which is helpful to improve the actual grinding efficiency.

[0027] Specifically, as shown in Figure 2 , the motor 6 is installed in the base 1, the output shaft of the motor 6 faces upward and is provided with a connecting rod 9, the bottom end of the grinding inner container 5 is provided with a connecting block 8, the end of the connecting rod 9 away from the motor 6 extends upward into the cooling cavity and is detachably connected with the connecting block 8, which facilitates the taking out and placing of the grinding inner container 5;

[0028] Further, the base 1 and the grinding tank 2 are both provided with a movable hole matched with the connecting rod 9, the lower end of the connecting rod 9 is cylindrical and is rotatably installed in the movable hole, the upper end of the connecting rod 9 extends into the cooling cavity and is prismatic, and the bottom of the connecting block 8 is provided with a polygonal slot matched with the upper end of the connecting rod 9, the upper end of the connecting rod 9 is inserted and assembled with the connecting block 8 through the polygonal slot, so that the bottom end of the grinding inner container 5 can be quickly assembled with the connecting rod 9, and at the same time, the motor 6 can also drive the connecting rod 9 and the connecting block 8 to rotate synchronously, realizing the rotation centrifugal grinding of the grinding inner container 5.

[0029] Specifically, as shown in Figure 2 , the opening inner diameter of the grinding tank 2 is larger than the inner cavity inner diameter to form a stepped shape, the upper end outer wall of the grinding inner container 5 is rotatably sleeved with a limiting plate 10, the limiting plate 10 is detachably assembled in the opening of the grinding tank 2, the bottom of the tank cover 3 is provided with a threaded pipe 11, the threaded pipe 11 is threadedly connected with the inner wall of the opening of the grinding tank 2, and the lower end surface of the threaded pipe 11 is pressed on the upper end surface of the limiting plate 10;

[0030] The inner ring of the limiting plate 10 has a bearing, the upper end of the grinding inner container 5 is installed in interference fit with the bearing, so that the limiting plate 10 can be rotatably assembled with the upper end of the grinding inner container 5, the opening of the grinding jar 2 is closed by the jar cover 3, the threaded tube 11 is screwed with the opening of the grinding jar 2, the upper end surface of the limiting plate 10 is pressed by the lower end of the threaded tube 11, so that the limiting plate 10 is limited in the opening of the grinding jar 2 and is difficult to move axially, which is beneficial to improve the rotation stability of the grinding inner container 5;

[0031] Further, the bottom of the jar cover 3 is rotatably installed with an inner cover 12 located in the inner ring of the threaded tube 11, the inner cover 12 covers the upper end opening surface of the grinding inner container 5, when the jar cover 3 is completely assembled at the opening of the grinding jar 2, the inner cover 12 closes the upper end opening of the grinding inner container 5, which can prevent the sample from accidentally spilling during the rotation centrifugal grinding process, thereby ensuring the cleanliness of the cooling cavity and the outer wall of the grinding inner container 5;

[0032] Further, as shown in Figure 2 and Figure 3 , the lower end surface of the limiting plate 10 is installed with a sealing ring 13, the sealing ring 13 is sleeved on the periphery of the grinding inner container 5 and has a gap with the grinding inner container 5, the outer peripheral surface of the sealing ring 13 is tightly attached to the inner wall of the grinding jar 2, the sealing ring 13 is an annular rubber sealing ring, through the setting of the sealing ring 13, the limiting plate 10 is more stable in the opening of the grinding jar 2, thereby improving the rotation centrifugal grinding stability of the grinding inner container 5, and the grinding inner container 5 can also play a certain sealing effect on the upper opening of the cooling cavity, although it cannot be completely sealed, but it can still improve the residence time of liquid nitrogen in the cooling cavity, thereby improving the cooling effect of liquid nitrogen on the grinding inner container 5, so that the sample is still in a low temperature state during the grinding process, thereby improving the actual grinding effect of the sample.

[0033] The technical features of the above embodiments can be combined in any way (as long as the combination of these technical features does not exist contradictory), in order to make the description simple, not all possible combinations of the technical features in the above embodiments are described; these embodiments which are not explicitly written, should also be considered as the scope of the present application.

Claims

1. A quick-cooling liquid nitrogen grinding device, comprising a base (1), a grinding tank (2) mounted on the top of the base (1), and an open top of the grinding tank (2) being provided with a tank cover (3), characterized in that: an inner grinding liner (5) with built-in grinding balls is arranged in the inner cavity of the grinding tank (2), and the inner grinding liner (5) is driven to rotate by a motor (6), the axis of the inner grinding liner (5) is aligned with the axis of the grinding tank (2), and the outer wall of the inner grinding liner (5) is opposite to the inner wall of the grinding tank (2) to form a cooling cavity, and a liquid nitrogen injection pipe (4) is mounted on the outside of the grinding tank (2), one end of the liquid nitrogen injection pipe (4) extending into the grinding tank (2) and communicating with the cooling cavity; the outer wall of the inner grinding liner (5) is provided with uniformly distributed conduction fins (7), and the other end of the conduction fins (7) has a gap with the inner wall of the grinding tank (2). The motor (6) is mounted in the base (1), the output shaft of the motor (6) is upward and provided with a connecting rod (9), the bottom end of the inner grinding liner (5) is provided with a connecting block (8), and the end of the connecting rod (9) away from the motor (6) extends upward into the cooling cavity and is detachably connected with the connecting block (8).

2. The liquid nitrogen polishing device capable of rapid cooling according to claim 1, wherein, The base (1) and the grinding tank (2) are both provided with a movable hole matched with the connecting rod (9), the lower end of the connecting rod (9) is cylindrical and rotatably mounted in the movable hole, the upper end of the connecting rod (9) extending into the cooling cavity is prismatic, the bottom of the connecting block (8) is provided with a polygonal slot matched with the upper end of the connecting rod (9), and the upper end of the connecting rod (9) is insertedly assembled with the connecting block (8) through the polygonal slot.

3. A liquid nitrogen polishing device capable of rapid cooling according to claim 2, wherein, The opening inner diameter of the grinding tank (2) is larger than the inner cavity inner diameter to form a stepped shape, the upper end outer wall of the inner grinding liner (5) is rotatably sleeved with a limiting plate (10), the limiting plate (10) is detachably assembled in the opening of the grinding tank (2), the bottom of the tank cover (3) is provided with a threaded pipe (11) threadedly connected with the inner wall of the opening of the grinding tank (2), and the lower end surface of the threaded pipe (11) is pressed on the upper end surface of the limiting plate (10).

4. The liquid nitrogen polishing device capable of rapid cooling according to claim 1, wherein, The bottom of the tank cover (3) is rotatably provided with an inner cover (12) in the inner circle of the threaded pipe (11), and the inner cover (12) covers the upper end opening end surface of the inner grinding liner (5).

5. A liquid nitrogen cooled grinding device according to claim 4, wherein, The lower end surface of the limiting plate (10) is provided with a sealing ring (13) sleeved on the periphery of the inner grinding liner (5) and having a gap with the inner grinding liner (5), and the outer peripheral surface of the sealing ring (13) is tightly attached to the inner wall of the grinding tank (2).

6. A liquid nitrogen polishing device capable of rapid cooling according to claim 4, wherein, The sealing ring (13) is an annular rubber sealing ring.

7. A liquid nitrogen cooled grinding device according to claim 6, wherein, ​

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