Tablet press, tablet pressing system and tablet pressing method for suppressing natural gas hydrate samples

Abstract

The present invention provides a tablet press, a tablet pressing system and a tablet pressing method for pressing natural gas hydrate tablets. The tablet press includes: a pressurizing device; a mold disposed in the pressurizing device; a cooling device communicated with the mold; wherein, the pressurizing device presses natural gas hydrate tablets in the mold, and the cooling device can control the temperature of the natural gas hydrate tablets during the pressing process. Based on the technical solution of the present invention, since the cooling device can control the temperature of the natural gas hydrate tablets during the pressing process. This ensures that the natural gas hydrate can be pressed in the required low-temperature environment, avoiding the problem that the tablet press in the related art cannot control the temperature of the natural gas hydrate tablets during the pressing process, resulting in their possible decomposition and inability to be pressed into natural gas hydrate tablets. Furthermore, it ensures that the tablet press can normally press out natural gas hydrate tablets.

Description

Technical Field

[0001] The present invention relates to the technical field of pressing equipment for test samples, and particularly to a tablet press, a tablet pressing system and a tablet pressing method for pressing natural gas hydrate samples. Background Art

[0002] Currently, when the tablet press in the related art presses natural gas hydrate samples, the natural gas hydrate samples are prone to decomposition, resulting in the inability of the tablet press to press the powdery natural gas hydrate samples into natural gas hydrate tablets. Summary of the Invention

[0003] In view of the above problems in the prior art, the present application provides a tablet press, a tablet pressing system and a tablet pressing method for pressing natural gas hydrate samples, which solve the problem that the tablet press cannot press the powdery natural gas hydrate samples into natural gas hydrate tablets.

[0004] The tablet press for pressing natural gas hydrate samples of the present invention includes: a pressurizing device; a mold provided in the pressurizing device; a cooling device communicated with the mold; wherein, the pressurizing device presses the natural gas hydrate samples in the mold, and the cooling device can control the temperature of the natural gas hydrate samples during the pressing process.

[0005] In one embodiment, the mold includes: an inner mold sleeve provided with a cooling cavity and a tablet pressing cavity not communicated with the cooling cavity; a pressing head at least partially disposed in the tablet pressing cavity; wherein, the cooling cavity is communicated with the cooling device and can exchange heat and cool the tablet pressing cavity, and the pressing head can press the natural gas hydrate samples in the tablet pressing cavity. Through this embodiment, the natural gas hydrate samples are ground into powder at low temperature, loaded into the tablet pressing cavity, and the pressing head extrudes the natural gas hydrate samples in the tablet pressing cavity under the action of external force to press them into natural gas hydrate tablets. Since the cooling cavity is filled with a cooling medium, it is ensured that throughout the pressing process, the natural gas hydrate samples are in the required low temperature state, thereby ensuring that the natural gas hydrate samples do not decompose, and further ensuring that the tablet press can normally press out natural gas hydrate tablets.

[0006] In one embodiment, the pressing head includes an upper pressing head and a lower pressing head, and the upper pressing head and the lower pressing head are respectively pressed against both ends of the tablet pressing cavity. Through this embodiment, the upper pressing head and the lower pressing head simultaneously extrude the powder in the tablet pressing cavity from both ends of the tablet pressing cavity, thereby ensuring that the natural gas hydrate samples can be pressed into natural gas hydrate tablets. Thus, it is ensured that the tablet press can work normally.

[0007] In one embodiment, the cooling chamber is arranged circumferentially around the tablet pressing chamber. Through this embodiment, the cooling chamber surrounds the outer periphery of the tablet pressing chamber, so that there is a sufficiently large heat exchange area between the cooling chamber and the tablet pressing chamber, thereby ensuring the heat exchange efficiency between the cooling chamber and the tablet pressing chamber, and further ensuring that the cooling medium in the cooling chamber can reduce the temperature in the tablet pressing chamber to the low temperature required for the natural gas hydrate sample, and further ensuring that the natural gas hydrate sample does not decompose, so as to ensure that the tablet press can normally press out the natural gas hydrate sample tablet.

[0008] In one embodiment, the mold further includes a heat insulation layer, which is arranged on the outer periphery of the inner sleeve of the mold. Through this embodiment, the heat insulation layer has the function of heat insulation, which can prevent heat exchange between the mold and the outside world and reduce the cooling efficiency of the cooling medium in the cooling chamber, thereby ensuring the cooling efficiency of the cooling device.

[0009] In one embodiment, the cooling device includes a pumping member for pumping the cooling medium into the cooling chamber of the mold. Through this embodiment, the controller can adjust the cooling rate of the inner sleeve of the mold by controlling the flow rate of the cooling medium, so as to ensure that the natural gas hydrate can be pressed under the required low temperature environment and avoid its decomposition. Further ensure that the tablet press can normally press out the natural gas hydrate sample tablet.

[0010] In one embodiment, the pressing device includes: a first pressing component; a second pressing component, which is spaced apart from the first pressing component in the first direction; wherein, the mold is clamped between the first pressing component and the second pressing component, and the first pressing component and the second pressing component can clamp and press the mold. Through this embodiment, the first pressing component and the second pressing component can press the punch of the mold from two different directions, so as to ensure that the punch can press the natural gas hydrate powder into a natural gas hydrate sample tablet in the tablet pressing chamber.

[0011] Another aspect of the present invention provides a tablet pressing system, including: the above-mentioned tablet press; a controller, electrically connected to the pumping member of the tablet press for controlling the output power of the pumping member.

[0012] In one embodiment, the cooling device further includes a temperature sensor electrically connected to the controller for monitoring the temperature of the mold in the tablet press. Through this embodiment, the controller realizes the temperature reduction control of the inner sleeve of the mold through the acquisition module and the pumping power control module. This modular intelligent control method has high control precision and fast control speed, so that the tablet press has a strong temperature reduction control function to meet the low temperature required for natural gas hydrates.

[0013] Another aspect of the present invention provides a tablet pressing method, including:

[0014] S1, reducing the temperature of the mold of the tablet press to the set temperature;

[0015] S2. Grind the natural gas hydrate sample into powder in a stable temperature environment and load it into the mold of the tablet press.

[0016] S3. Press the powder into a natural gas hydrate sample tablet.

[0017] S4. Take out the natural gas hydrate sample tablet from the mold.

[0018] The above technical features can be combined in various suitable ways or replaced by equivalent technical features as long as the object of the present invention can be achieved.

[0019] A tablet press, a tablet pressing system and a tablet pressing method for pressing natural gas hydrate sample tablets provided by the present invention have at least the following beneficial effects compared with the prior art:

[0020] Since the cooling device can control the temperature of the natural gas hydrate sample tablet during the pressing process. This ensures that the natural gas hydrate can be pressed in the required low-temperature environment, avoiding the problem that the tablet press in the related art cannot control the temperature of the natural gas hydrate sample tablet during the pressing process, resulting in its possible decomposition and inability to press into a natural gas hydrate sample tablet. Furthermore, it ensures that the tablet press can normally press out the natural gas hydrate sample tablet. Description of the Drawings

[0021] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the drawings. Among them:

[0022] Figure 1 Shows a schematic structural diagram of the tablet pressing system in the second embodiment of the present invention (including the structure of the tablet press in the first embodiment of the present invention);

[0023] Figure 2 Shows Figure 1 A cross-sectional view of the mold in (which has the same mold structure as the tablet press in the first embodiment of the present invention);

[0024] Figure 3 Shows a method flow chart of the tablet pressing method in the third embodiment of the present invention.

[0025] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale.

[0026] Reference Numerals:

[0027] 10 - Pressurizing device, 11 - First pressurizing component, 111 - Support frame, 1111 - Column, 1112 - Upper plate, 112 - Lead screw, 1121 - Lead screw pressure seat, 113 - Handwheel, 12 - Second pressurizing component, 121 - Lower pressure seat, 122 - Hydraulic workbench, 123 - Pressure relief valve rod, 124 - Pressurizing handle, 125 - Pressure gauge, 126 - Oil injection hole, 20 - Mold, 21 - Mold inner sleeve, 211 - Cooling cavity, 2111 - Inlet, 2112 - Outlet, 212 - Tablet pressing cavity, 22 - Pressing head, 221 - Upper pressing head, 222 - Lower pressing head, 23 - Heat preservation layer, 30 - Cooling device, 31 - Pumping component, 32 - Controller, 33 - Liquid nitrogen tank, 34 - Heat preservation hose, 35 - Signal transmission line, 40 - Temperature acquisition line. Detailed implementation mode

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] It should be noted that natural gas hydrate is a kind of ice - like crystalline substance formed by natural gas and water under low - temperature and high - pressure conditions, which is distributed in deep - sea sediments or permafrost on land. Natural gas hydrate is a kind of unconventional energy resource with huge reserves and cleanness, and it is also one of China's strategic resources. The structure of hydrate and the filling of guest molecules in its cages are basic scientific issues in the research of natural gas hydrate, and Fourier transform infrared absorption spectroscopy is a powerful means for analyzing and determining the structure and occupancy rate of hydrate. Infrared spectroscopy analysis is an analytical and testing method that uses the difference in the absorption ability of infrared rays with specific wavelengths to study the structure and chemical bonds of molecules. Because when performing infrared spectroscopy analysis, the substance to be measured needs to be pressed into a transparent or semi - transparent sample tablet to ensure good transmission of infrared light so as to carry out experimental measurement. With the development and popularization of infrared spectrometers, its supporting facility, the infrared tablet press, has emerged as the times require.

[0030] Natural gas hydrate samples need a low - temperature environment to be stably stored. In order to better carry out the infrared spectroscopy analysis of natural gas hydrate samples, the natural gas hydrate samples need to be pressed into natural gas hydrate sample tablets in a low - temperature environment before analysis. At present, the tablet presses in related technologies do not have the temperature control ability, which will cause the decomposition of natural gas hydrate samples during the tablet - pressing process and unable to form. The force of manual tablet - pressing varies from person to person, which is likely to cause uneven tablet - pressing and affect the subsequent test accuracy. In addition, manual tablet - pressing needs to be operated in a liquid nitrogen bath, and the ultra - low - temperature operation environment of about - 190 °C has great potential safety hazards.

[0031] Embodiment 1

[0032] As Figure 1As shown in the figure, the present invention provides a tablet press for pressing natural gas hydrate samples, which includes a pressurizing device 10, a mold 20, and a cooling device 30. Among them, the mold 20 is arranged in the pressurizing device 10, and the cooling device 30 is communicated with the mold 20. The pressurizing device 10 presses the natural gas hydrate sample in the mold 20, and the cooling device 30 can control the temperature of the natural gas hydrate sample during the pressing process.

[0033] In the above setting, since the cooling device 30 can control the temperature of the natural gas hydrate sample during the pressing process. This ensures that the natural gas hydrate can be pressed in the required low-temperature environment, avoiding the problem that the tablet press in the related technology cannot control the temperature of the natural gas hydrate sample during the pressing process, resulting in its possible decomposition and inability to press into a natural gas hydrate sample. Furthermore, it ensures that the tablet press can normally press out the natural gas hydrate sample.

[0034] It should be noted that the natural gas hydrate sample in this application is pressed from powdery natural gas hydrate and can be used as a test sample for an infrared spectrometer. The cooling medium in this application is liquid nitrogen. The first direction in this application refers to Figure 1 and Figure 2 the vertical direction in.

[0035] Specifically, as Figure 1 shown, in one embodiment, the mold 20 includes an inner mold sleeve 21 and a pressing head 22. Among them, the inner mold sleeve 21 is provided with a cooling cavity 211 and a tablet pressing cavity 212 that is not communicated with the cooling cavity 211. The pressing head 22 is partially arranged in the tablet pressing cavity 212. Among them, the cooling cavity 211 is communicated with the cooling device 30 and can exchange heat and cool the tablet pressing cavity 212, and the pressing head 22 can press the natural gas hydrate sample in the tablet pressing cavity 212.

[0036] In the above setting, the natural gas hydrate sample is ground into powder at low temperature and loaded into the tablet pressing cavity 212. The pressing head 22 extrudes and forms the natural gas hydrate sample in the tablet pressing cavity 212 under the action of external force to press into a natural gas hydrate sample. Since the cooling cavity 211 is filled with a cooling medium, this ensures that the natural gas hydrate sample is in the required low-temperature state throughout the pressing process, thereby ensuring that the natural gas hydrate sample does not decompose, and further ensuring that the tablet press can normally press out the natural gas hydrate sample.

[0037] It should be noted that the cooling cavity 211 is a closed pipeline loop to avoid potential safety hazards caused by the diffusion of liquid nitrogen.

[0038] Specifically, as Figure 2 shown, in one embodiment, the pressing head 22 includes an upper pressing head 221 and a lower pressing head 222, and the upper pressing head 221 and the lower pressing head 222 are respectively press-connected to both ends of the tablet pressing cavity 212.

[0039] In the above setting, the upper punch 221 and the lower punch 222 simultaneously squeeze the powder in the tablet pressing cavity 212 from both ends of the tablet pressing cavity 212, thereby ensuring that the natural gas hydrate sample can be pressed into a natural gas hydrate tablet. Thus, it is ensured that the tablet press can work normally.

[0040] Specifically, as Figure 2 shown, in one embodiment, the cooling cavity 211 is arranged circumferentially along the tablet pressing cavity 212.

[0041] In the above setting, the cooling cavity 211 is arranged around the outer periphery of the tablet pressing cavity 212, so that there is a sufficiently large heat exchange area between the cooling cavity 211 and the tablet pressing cavity 212, thereby ensuring the heat exchange efficiency between the cooling cavity 211 and the tablet pressing cavity 212. Furthermore, it is ensured that the cooling medium in the cooling cavity 211 can reduce the temperature in the tablet pressing cavity 212 to the low temperature required for the natural gas hydrate sample, and further ensure that the natural gas hydrate sample does not decompose, so as to ensure that the tablet press can normally press out the natural gas hydrate tablet.

[0042] Specifically, as Figure 2 shown, in one embodiment, the mold 20 further includes a heat insulation layer 23, and the heat insulation layer 23 is arranged on the outer periphery of the inner sleeve 21 of the mold.

[0043] In the above setting, the heat insulation layer 23 has a heat insulation function, which can prevent heat exchange between the mold 20 and the outside world and reduce the cooling efficiency of the cooling medium in the cooling cavity 211, thereby ensuring the cooling efficiency of the cooling device 30.

[0044] Specifically, as Figure 1 shown, in one embodiment, the cooling device 30 includes a pumping member 31, and the pumping member 31 is used to pump the cooling medium into the cooling cavity 211 of the mold 20.

[0045] Specifically, as Figure 1 shown, in one embodiment, the pressurizing device 10 includes a first pressurizing assembly 11 and a second pressurizing assembly 12. Among them, the second pressurizing assembly 12 is spaced apart from the first pressurizing assembly 11 in the first direction. The mold 20 is clamped between the first pressurizing assembly 11 and the second pressurizing assembly 12, and the first pressurizing assembly 11 and the second pressurizing assembly 12 can clamp and press the mold 20.

[0046] In the above setting, the first pressurizing assembly 11 and the second pressurizing assembly 12 can apply pressure to the punch 22 of the mold 20 from two different directions, thereby ensuring that the punch 22 can press the natural gas hydrate powder into a natural gas hydrate tablet in the tablet pressing cavity 212.

[0047] Specifically, as Figure 1As shown, in one embodiment, the first pressing assembly 11 includes a support frame 111, a lead screw 112, and a handwheel. Among them, the support frame 111 is disposed on the second pressing assembly 12. The lead screw 112 is threadedly connected to the support frame 111. The handwheel 113 is disposed on the lead screw 112, and by rotating the handwheel 113, the lead screw 112 is pressed against the mold 20.

[0048] Specifically, as Figure 1 shown, in one embodiment, the support frame 111 includes a column 1111 and an upper plate 1112. The column 1111 is connected to the upper plate 1112 to play a supporting role. The upper plate 1112 is provided with a threaded hole for threaded connection with the lead screw 112.

[0049] Specifically, as Figure 1 shown, in one embodiment, the second pressing assembly 12 includes a lower pressing seat 121, a hydraulic workbench 122, a pressure relief valve rod 123, a pressing handle 124, a pressure gauge 125, and an oil injection hole 126. Among them, the hydraulic workbench 122 is disposed on the ground, the lower pressing seat 121 is disposed on the hydraulic workbench 122, and the mold 20 is placed on the lower pressing seat 121. The pressure relief valve rod 123 and the pressing handle 124 are respectively disposed on the hydraulic workbench 122. The pressure gauge 125 and the oil injection hole 126 are disposed at the top position of the hydraulic workbench 122.

[0050] Specifically, as Figure 1 shown, in one embodiment, the pumping member 31 is a liquid nitrogen pump, and the cooling device 30 further includes a liquid nitrogen tank 33 and a heat preservation hose 34. The heat preservation hose 34 is used to connect the liquid nitrogen pump and the liquid nitrogen tank 33 to the inner sleeve 21 of the mold.

[0051] Specifically, as Figure 2 shown, in one embodiment, the cooling cavity 211 is provided with an inlet 2111 and an outlet 2112. The liquid nitrogen pump is connected to the inlet 2111 through a heat preservation hose 34, and the liquid nitrogen tank 33 is connected to the outlet 2112 through another heat preservation hose 34.

[0052] Embodiment Two

[0053] As Figure 1 and Figure 2 shown, the present invention provides a tablet pressing system, including a tablet press and a controller. The controller is electrically connected to the pumping member of the tablet pressing for controlling the output power of the pumping member.

[0054] Specifically, as Figure 1 and Figure 2As shown in the figure, the tablet press includes a pressing device 10, a mold 20, and a cooling device 30. Among them, the mold 20 is arranged in the pressing device 10, and the cooling device 30 is communicated with the mold 20. The mold 20 includes an inner mold sleeve 21 and a pressing head 22. Among them, the inner mold sleeve 21 is provided with a cooling cavity 211 and a tablet pressing cavity 212 that is not communicated with the cooling cavity 211.

[0055] The pressing head 22 is partially arranged in the tablet pressing cavity 212. Among them, the cooling cavity 211 is communicated with the cooling device 30. The pressing head 22 includes an upper pressing head 221 and a lower pressing head 222, and the upper pressing head 221 and the lower pressing head 222 are respectively pressed against both ends of the tablet pressing cavity 212. The cooling cavity 211 is arranged along the circumferential direction of the tablet pressing cavity 212. The mold 20 further includes a heat insulation layer 23, and the heat insulation layer 23 is arranged on the outer periphery of the inner mold sleeve 21.

[0056] The cooling device 30 includes a pumping member 31, and the pumping member 31 is used to pump the cooling medium into the cooling cavity 211 of the mold 20. The pressing device 10 includes a first pressing assembly 11 and a second pressing assembly 12. Among them, the second pressing assembly 12 is arranged at an interval from the first pressing assembly 11 in the first direction. The mold 20 is clamped between the first pressing assembly 11 and the second pressing assembly 12, and the first pressing assembly 11 and the second pressing assembly 12 can clamp and press the mold 20.

[0057] The first pressing assembly 11 includes a support frame 111, a lead screw 112, and a hand wheel. Among them, the support frame 111 is arranged on the second pressing assembly 12. The lead screw 112 is threadedly connected to the support frame 111. The hand wheel 113 is arranged on the lead screw 112, and by rotating the hand wheel 113, the lead screw 112 is pressed against the mold 20. The support frame 111 includes a column 1111 and an upper plate 1112. The column 1111 is connected to the upper plate 1112 to play a supporting role. The upper plate 1112 is provided with a threaded hole and is threadedly connected to the lead screw 112.

[0058] The second pressing assembly 12 includes a lower pressing seat 121, a hydraulic workbench 122, a pressure relief valve rod 123, a pressing handle 124, a pressure gauge 125, and an oil injection hole 126. Among them, the hydraulic workbench 122 is arranged on the ground, the lower pressing seat 121 is arranged on the hydraulic workbench 122, and the mold 20 is placed on the lower pressing seat 121. The pressure relief valve rod 123 and the pressing handle 124 are respectively arranged on the hydraulic workbench 122. The pressure gauge 125 and the oil injection hole 126 are arranged at the top position of the hydraulic workbench 122.

[0059] The pumping component 31 is a liquid nitrogen pump. The cooling device 30 further includes a liquid nitrogen tank 33 and a heat-insulating hose 34. The heat-insulating hose 34 is used to connect the liquid nitrogen pump and the liquid nitrogen tank 33 to the inner sleeve 21 of the mold. The cooling cavity 211 is provided with an inlet 2111 and an outlet 2112. The liquid nitrogen pump is connected to the inlet 2111 through a heat-insulating hose 34, and the liquid nitrogen tank 33 is connected to the outlet 2112 through another heat-insulating hose 34.

[0060] The cooling device 30 further includes a temperature sensor, which is arranged inside the inner sleeve 21 of the mold 20 and is used to monitor the temperature of the mold 20. The controller 32 includes an acquisition module and a pumping power control module. The acquisition module can obtain the sampled value of the mold temperature from the mold temperature signal fed back by the temperature sensor. The controller 32 can send a control instruction to the pumping power control module according to the sampled value, and the pumping power control module controls the output efficiency of the pumping component 31 according to the control instruction.

[0061] In the above setting, the controller 32 can adjust the cooling rate of the inner sleeve 21 of the mold by controlling the flow rate of the cooling medium, so as to ensure that the natural gas hydrate can be pressed under the required low-temperature environment and avoid its decomposition. Furthermore, it ensures that the tablet press can normally press out the natural gas hydrate sample tablets. The controller 32 realizes the cooling control of the inner sleeve 21 of the mold through the acquisition module and the pumping power control module. This modular intelligent control method has high control accuracy and fast control speed, so that the tablet pressing system has a strong cooling control function to meet the low temperature required by the natural gas hydrate.

[0062] It should be noted that the acquisition module of the controller 32 is electrically connected to the temperature sensor inside the inner sleeve 21 of the mold through a temperature acquisition line 40.

[0063] Specifically, as Figure 1 shown, in one embodiment, the controller 32 is a temperature controller. A signal transmission line 35 is arranged between the liquid nitrogen pump and the temperature controller for electrical connection.

[0064] It should be noted that in this application, the inner sleeve 21 of the mold is connected to the cooling device 30 through a heat-insulating hose 34. The cooling device 30 uses liquid nitrogen as a cold source. The acquisition module of the temperature controller acquires the electrical signal fed back by the temperature sensor inside the inner sleeve 21 of the mold. The microcontroller (controller 32) performs piping and instrumentation diagram calculation, and controls the pulse width modulation of the microcontroller according to the calculation result. The pulse width modulation is output to the power adjustment circuit to adjust the output power of the corresponding liquid nitrogen pump. The present invention adjusts the cooling rate of the inner sleeve 21 of the mold by regulating the liquid nitrogen flow rate. The liquid nitrogen pump generates negative pressure through mechanical structure movement, sucks the liquid nitrogen from the liquid nitrogen tank 33 into the pump, and the liquid nitrogen flows through the inner sleeve 21 of the mold to reduce the temperature inside the inner sleeve 21 of the mold. The liquid nitrogen pump heats the inhaled liquid nitrogen into nitrogen gas through a built-in liquid nitrogen vaporization device to avoid the risk brought by the external discharge of liquid nitrogen.

[0065] It should be noted that the hydraulic workbench 122 is of an integrated structure, and the internal oil pool, oil cylinder, tension spring, etc. are all integrated on a main board. A lower pressing seat 121 is installed at the center position of the upper surface of the hydraulic workbench 122, and the lower pressing seat 121 is connected to the output end of the hydraulic workbench 122. An upper plate 1112 is installed above the hydraulic workbench 122, and the hydraulic workbench 122 and the upper plate 1112 are fixedly connected by two columns 1111. A screw hole is provided at the center position of the upper plate 1112, and a lead screw 112 is screwed into the screw hole. The upper end of the lead screw 112 is fixed with a hand wheel 113, and a grip is installed on the surface of the hand wheel 113. The lower end of the lead screw 112 is welded with a lead screw pressing seat 1121. The circulating cooling system uses liquid nitrogen as a cold source, and mainly cools the mold 20 by controlling the liquid nitrogen rate. The temperature control range of the circulating cooling system of the present invention is -190°C to room temperature. The temperature sensor built in the inner sleeve 21 of the mold is connected to the temperature controller, and a thermistor is used, and the accuracy needs to meet ±0.1°C.

[0066] Embodiment III

[0067] As Figure 3 shown, the present invention provides a tablet pressing method, and this manufacturing method can be implemented by the tablet press in Embodiment I or the tablet pressing system in Embodiment II. It includes:

[0068] Lower the temperature of the mold of the tablet press to the set temperature;

[0069] Grind the natural gas hydrate sample into powder in a stable environment (a low-temperature environment where it does not decompose), and load it into the mold;

[0070] Press the powder into a natural gas hydrate tablet;

[0071] Take out the natural gas hydrate tablet from the mold.

[0072] The following elaborates in detail the tablet pressing method using the tablet pressing system, including the following steps:

[0073] First step: Assemble the upper pressing head, the inner sleeve of the mold and the lower pressing head.

[0074] Second step: Turn on the temperature controller and the liquid nitrogen pump of the circulating cooling system (cooling device), and set the temperature of the temperature controller to be lower than -120°C.

[0075] Third step: Wait until the temperature of the inner sleeve of the mold drops to the set temperature, and remove the upper pressing head. During the process, low-temperature protection needs to be done well.

[0076] Fourth step: Grind the natural gas hydrate sample into powder in a liquid nitrogen environment, load it into the tablet pressing cavity of the inner sleeve of the mold, and roll and flatten it.

[0077] Step 5: Install the upper punch, place the mold in the center of the hydraulic workbench, and rotate the handwheel to lower the lead screw so that the lead screw seat of the lead screw compacts the mold.

[0078] Step 6: Tighten the pressure relief valve rod, operate the pressure application handle to start pressurizing, pay attention to the change in the indication of the pressure gauge, and press to the required pressure.

[0079] Step 7: Loosen the pressure relief valve rod to drain the oil, take out the mold, and low-temperature protection should be provided during the process.

[0080] Step 8: Install the demolding tool in the liquid nitrogen bath and take out the natural gas hydrate sample piece from the mold.

[0081] The following elaborates in detail the method of tablet pressing using a tablet press, including the following steps:

[0082] Step 1: Assemble the upper punch, the inner sleeve of the mold, and the lower punch.

[0083] Step 2: Turn on the cooling device and the liquid nitrogen pump, and set the temperature inside the mold, which should be lower than -120°C.

[0084] Step 3: Wait until the temperature of the inner sleeve of the mold drops to the set temperature, remove the upper punch, and low-temperature protection should be provided during the process.

[0085] Step 4: Grind the natural gas hydrate sample into powder in a liquid nitrogen environment, load it into the tablet pressing cavity of the inner sleeve of the mold, and spread it evenly.

[0086] Step 5: Install the upper punch, place the mold in the center of the hydraulic workbench, and rotate the handwheel to lower the lead screw so that the lead screw seat of the lead screw compacts the mold.

[0087] Step 6: Tighten the pressure relief valve rod, operate the pressure application handle to start pressurizing, pay attention to the change in the indication of the pressure gauge, and press to the required pressure.

[0088] Step 7: Loosen the pressure relief valve rod to drain the oil, take out the mold, and low-temperature protection should be provided during the process.

[0089] Step 8: Install the demolding tool in the liquid nitrogen bath and take out the natural gas hydrate sample piece from the mold.

[0090] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0091] Although the present invention has been described herein with reference to particular embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Accordingly, it should be understood that numerous modifications may be made to the exemplary embodiments, and other arrangements may be devised, without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that different dependent claims and the features described herein may be combined in ways different from those described in the original claims. It should also be understood that features described in connection with separate embodiments may be used in other described embodiments.

Claims

1. A tablet press for pressing natural gas hydrate samples, characterized in that, Comprising: A pressurizing device; A mold, disposed on the pressurizing device; A cooling device, communicating with the mold; Wherein, the pressurizing device presses the natural gas hydrate sample piece in the mold, and the cooling device can control the temperature of the natural gas hydrate sample piece during the pressing process; The mold includes: An inner mold sleeve, provided with a cooling cavity and a tablet pressing cavity not communicating with the cooling cavity; A pressing head, at least partially disposed in the tablet pressing cavity; Wherein, the cooling cavity communicates with the cooling device and can perform heat exchange cooling on the tablet pressing cavity, and the pressing head can press the natural gas hydrate sample piece in the tablet pressing cavity; The pressing head includes an upper pressing head and a lower pressing head, and the upper pressing head and the lower pressing head are respectively pressed against both ends of the tablet pressing cavity; The mold further includes a heat insulation layer, and the heat insulation layer is disposed on the outer periphery of the inner mold sleeve.

2. The tablet press for pressing natural gas hydrate samples according to claim 1, characterized in that, The cooling cavity is disposed along the circumferential direction of the tablet pressing cavity.

3. The tablet press for pressing natural gas hydrate samples according to any one of claims 1 or 2, characterized in that, The cooling device includes a pumping member for pumping a cooling medium into the cooling cavity of the mold.

4. The tablet press for pressing natural gas hydrate samples according to any one of claims 1 or 2, characterized in that, The pressurizing device includes: A first pressurizing assembly; A second pressurizing assembly, spaced apart from the first pressurizing assembly in a first direction; Wherein, the mold is clamped between the first pressurizing assembly and the second pressurizing assembly, and the first pressurizing assembly and the second pressurizing assembly can clamp and press the mold.

5. A tablet pressing system, characterized in that, Comprising: A tablet press according to any one of claims 1 to 4; A controller, electrically connected to the pumping member of the tablet press for controlling the output power of the pumping member.

6. The tablet pressing system according to claim 5, characterized in that, It further includes a temperature sensor electrically connected to the controller for monitoring the temperature of the mold in the tablet press.

7. A tablet pressing method implemented using the tablet pressing system according to claim 5 or 6, characterized in that, Comprising: S1, reducing the temperature of the mold of the tablet press to a set temperature; S2, grinding the natural gas hydrate sample into powder in a low-temperature environment and loading it into the mold; S3, pressing the powder into a natural gas hydrate sample piece; S4, taking out the natural gas hydrate sample piece from the mold.

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