Nondestructive freeze-drying sample preparation device for high-water-content rock

Abstract

The application discloses a high-water-content rock nondestructive freeze-drying sample preparation device, which comprises a cutting device and a sample preparation device, coaxial transparent cylinders are arranged on the left and right sides of the cutting device, the transparent cylinders are provided with the sample preparation device, a sealing cover is sealingly connected to the outer end of the transparent cylinder, a vacuum pump is installed on the sealing cover on the left side, and a gas exchange tank is installed on the sealing cover on the right side.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rock sample preparation, in particular to a high-water-content rock non-destructive freeze-drying sample preparation device. BACKGROUND

[0002] Oven drying to obtain a solid skeleton structure is a necessary pretreatment step for testing rock pores. For rocks with weak diagenesis and high water content, such as mud shale and lignite, severe shrinkage will occur when water is removed by drying, causing the original structure of the rock to be destroyed. Freeze drying is a process in which the sample is rapidly frozen at ultra-low temperature and the water in the sample is removed by sublimation under vacuum conditions. When liquid water is rapidly frozen at low temperature, it is converted into amorphous ice before crystallization occurs. This transformation does not cause linear expansion due to phase formation, so deformation of the sample can be avoided as much as possible. However, different rocks have different protection effects on rocks under different rock sample specifications, pre-freezing temperatures, and different pressures (vacuum levels).

[0003] Therefore, the skilled person in the art provides a high-water-content rock non-destructive freeze-drying sample preparation device to solve the problems raised in the background art. SUMMARY

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a high-water-content rock non-destructive freeze-drying sample preparation device, comprising a cutting device and a sample preparation device, the cutting device is coaxially connected with a transparent cylinder on both sides, the transparent cylinder is also provided with a sample preparation device, the outer port of the transparent cylinder is sealingly connected with a sealing cover, a vacuum pump is installed on the left sealing cover, and a gas exchange tank is installed on the right sealing cover.

[0005] In the above technical scheme, the cutting device comprises a semi-arc plate, a ring disc and a cutting assembly, the ring discs are coaxially arranged in two groups with a left-right interval, the outer ring of the upper plate of the two groups of ring discs is connected through a group of semi-arc plates, the lower half outer ring of the two groups of ring discs is sealingly connected with a group of semi-arc plates, the cutting assembly is swingably installed on one side above the ring disc, and a dust collection net is further provided on the lower semi-arc plate.

[0006] In the above technical scheme, the dust collection net is arranged in three groups in an arc shape, and the pore size of the dust collection net increases from the outside to the inside.

[0007] In the above technical scheme, the outer end of the dust collection net is further connected with an air pump through a pipeline, and the exhaust end of the air pump is connected with the right sealing cover through a pipeline.

[0008] In the above technical scheme, the sample preparation device comprises rotating rings, the rotating rings are provided in two groups, the inner ring wall of the rotating ring is uniformly provided with multiple groups of parallel plate frames, the inner ring wall of the rotating ring is also uniformly provided with multiple groups of supporting plates, a thick conveyor belt is installed between the parallel plate frames on the left and right sides, two groups of parallel connecting cross bars are installed between the supporting plates on the left and right sides, an extender is rotatably sleeved on the outer connecting cross bar, a clamping plate cover is rotatably sleeved on the inner connecting cross bar, and the output end of the extender is hinged to the clamping plate cover.

[0009] The rotating ring close to the ring disc is rotationally connected with the ring disc, and the outer ring wall of the rotating ring on the other side is further fixed with a straight tooth ring, the straight tooth ring is engaged with a driving gear, and the driving gear is installed on the transparent cylinder through a connecting plate seat.

[0010] In the above technical scheme, the clamping plate cover is further provided with dense air permeable holes.

[0011] In the above technical scheme, a vacuum pressure monitoring head is further included and arranged on the inner wall of the right sealing cover.

[0012] In the above technical scheme, a CT scanning assembly is further included and arranged on the transparent cylinder.

[0013] In the above technical scheme, a temperature detection head is further included and arranged on the transparent cylinder.

[0014] In the above technical scheme, the left sealing cover is further filled with a hemispherical crystal particle adhesive net.

[0015] Compared with the prior art, the high-water-content rock nondestructive freeze-drying sample preparation device has the following beneficial effects:

[0016] The sealing cover, the transparent barrel, the half-arc plate and the like are arranged in the application, so that the installation is convenient under the premise of good sealing, the replacement and installation of the high-water-content rock or component are more convenient and efficient, the gas exchange tank is arranged, the high-water-content rock is cut in the sealed environment, the accuracy of water detection is ensured, the gas pump and the dust absorption net and the sealing cover are communicated, the internal circulation of the existing gas is formed, the broken pieces fall into the dust absorption net, the dust absorption net is arranged, the broken pieces can quickly fall into the dust absorption net during cutting and are not easy to be broken, the sample preparation device is arranged and the number is arranged, different specifications of rock samples can be quickly obtained, the vacuum environment is arranged, the vacuum pressure monitoring head, the CT scanning assembly and the temperature detection head are arranged, the state of the internal structure of the rock sample under different conditions is regulated, the environment and the rock sample are regulated and segmented again, so that more rock samples prepared under the conditions of the environment and the opportunity can be obtained in the process of one-time sample preparation, the rock sample with the most complete internal structure of the high-water-content rock after freeze-drying can be obtained and the preparation conditions are obtained. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is an external structure schematic diagram of the sample preparation device of the application.

[0018] Fig. 2 It is an internal structure schematic diagram of the sample preparation device of the application.

[0019] Fig. 3 It is an enlarged schematic diagram of the local structure of the sample preparation device of the application.

[0020] In the figure: 1, cutting device; 2, transparent barrel; 3, sealing cover; 4, vacuum pump; 5, gas exchange tank; 6, gas pump; 7, sample preparation device; 8, CT scanning assembly; 9, half-arc plate; 10, ring disc; 11, cutting assembly; 12, dust absorption net; 13, rotating ring; 14, parallel plate frame; 15, thick conveyor belt; 16, support plate; 17, connecting cross rod; 18, telescopic device; 19, clamping plate cover; 20, air hole; 21, straight-toothed ring; 22, driving gear; 23, crystal particle adhesive net; 24, temperature detection head; 25, vacuum pressure monitoring head. DETAILED DESCRIPTION

[0021] REFERENCE Figs. 1-3 The application provides a technical scheme: a high-water-content rock nondestructive freeze-drying sample preparation device, which comprises a cutting device 1 and a sample preparation device 7, the cutting device 1 is coaxially connected with a transparent barrel 2 on the left and the right, the transparent barrel 2 is also provided with the sample preparation device 7, a sealing cover 3 is sealingly connected to the outer port of the transparent barrel 2, a vacuum pump 4 is installed on the left sealing cover 3, and a gas exchange tank 5 is installed on the right sealing cover 3.

[0022] The embodiment also comprises a freezer, so that when the high water content rock is sampled, an ultralow temperature environment is provided to convert liquid water into amorphous ice, and the transparent structure of the transparent cylinder is used to improve the effect of directly observing the sampling control of the high water content rock, and the gas tank stores pure rare gas, so that after the high water content rock is installed in the sampling device, the air in the transparent cylinder and the sealing cover can be discharged through the action of the gas tank and the vacuum pump, and the gas tank is filled with gas, so as to monitor the water content discharged from the high water content rock, wherein the vacuum pump is provided with a gas concentration monitor for monitoring the concentration of rare gas in the discharged gas when cooperating with the gas tank, so as to judge whether the gas exchange is completed.

[0023] In the embodiment of the present application, the cutting device 1 comprises half-arc plates 9, ring discs 10 and cutting assemblies 11. The two groups of ring discs 10 are coaxially arranged left and right. The upper plate outer ring of the two groups of ring discs 10 is connected by a group of half-arc plates 9. The lower half-outer ring of the two groups of ring discs 10 is sealingly connected by a group of half-arc plates 9. The cutting assembly 11 is swingably installed above one side of the ring disc 10. The dust absorption net 12 is further arranged on the lower half-arc plate 9.

[0024] Specifically, when the cutting assembly cuts the high water content rock, the dust absorption net is used to absorb the cutting debris, so as to avoid flowing into the vacuum pump and damaging the vacuum pump. Moreover, the cutting debris can be reserved, so as to ensure the accuracy of monitoring the water content discharged from the high water content rock.

[0025] Meanwhile, the lower half-arc plate is detachably connected with the upper half-arc plate and the ring disc, which is beneficial to the replacement of the dust absorption net. Moreover, the dust absorption net needs to be replaced after the sampling of the high water content rock is completed or the experiment is completed.

[0026] In one embodiment, the dust absorption net 12 is arranged in three groups in an arc shape. The aperture of the dust absorption net 12 gradually increases from the outside to the inside, so that the larger debris falls on the inner side and the smaller debris falls on the outer side, so that the cutting debris is orderly and uniformly distributed in the inside of the dust absorption net, more debris can be absorbed, the debris can be reduced, and the debris can be promoted to fall into the dust absorption net.

[0027] In one embodiment, the outer end of the dust absorption net 12 is further connected with the air pump 6 through the pipeline. The exhaust end of the air pump 6 is connected with the right sealing cover 3 through the pipeline, so that when the cutting assembly cuts the high water content rock, the air in the transparent cylinder is circulated and the cutting debris is drained to the dust absorption net through the operation of the air pump.

[0028] In the embodiment of the present application, the sample preparation device 7 comprises a rotating ring 13, the rotating ring 13 is provided with two groups, a plurality of parallel plate frames 14 are uniformly distributed on the inner ring wall of the rotating ring 13, a plurality of support plates 16 are also uniformly distributed on the inner ring wall of the rotating ring 13, a thick conveyor belt 15 is installed between the left and right parallel plate frames 14, two groups of parallel connecting cross bars 17 are installed between the left and right support plates 16, an extender 18 is rotatably sleeved on the outer connecting cross bar 17, a clamping plate cover 19 is rotatably sleeved on the inner connecting cross bar 17, and the output end of the extender 18 is hinged to the clamping plate cover 19;

[0029] The rotating ring 13 close to the ring disc 10 is rotatably connected with the ring disc 10, and a straight tooth ring 21 is further fixed on the outer ring wall of the rotating ring 13 on the other side, the straight tooth ring 21 is engaged with a driving gear 22, and the driving gear 22 is installed on the transparent cylinder 2 through a connecting plate seat;

[0030] In the embodiment, the clamping plate cover is combined with the high water content rock for clamping and fixing or separated through the control of the extender, and the thick conveyor belt is arranged to drive the high water content rock to move in the direction of the cutting assembly, so as to move the length of the high water content rock required to be cut and the fixing strength of the high water content rock during cutting;

[0031] In one embodiment, the transmission speed of the transmission belt in the left salt making device and the right sample making device can be independently controlled, so that the high water content rock can be cut at any time through the action of the cutting assembly, the conveyor belt and the extender, and different specifications of rock samples can be obtained. Moreover, through the differential speed control of the left and right conveyor belts, a certain interval can be left between the cutting of different specifications of rock samples, which is not only beneficial to the escape of water crystals in the rock sample, but also beneficial to the re-cutting of the cut rock sample.

[0032] In one embodiment, a plurality of air permeable holes 20 are further formed in the clamping plate cover 19, so that the surface of the high water content rock clamped by the clamping plate cover can also escape water crystals.

[0033] In the embodiment of the present application, a vacuum pressure monitoring head 25 is further arranged on the right sealing cover 3 to monitor and control the state of the rock sample prepared under different pressures (vacuum degree) of the high water content rock.

[0034] In the embodiment of the present application, a CT scanning assembly 8 is further arranged on the transparent cylinder 2 to scan the pore and fracture of the high water content rock, so as to obtain the structure state of the rock sample.

[0035] In the embodiment of the present application, a temperature detection head 24 is further arranged on the transparent cylinder 2 to monitor the pre-freezing temperature of the high water content rock.

[0036] In the embodiment of the present application, the left sealing cover 3 is also filled with a hemispherical crystal particle adhesive net 23, which adheres the water crystals excluded by the high water content rock, so as to obtain the water in the high water content rock sample. In the embodiment, the sealing cover is also transparent, which is beneficial to the direct observation of the adhesion state of the water crystals.

[0037] In the specific implementation, the left sealing cover is opened, the high water content rock required for preparing the rock sample is introduced into one end of the left sample preparation device, and the high water content rock is gradually sent into the right sample preparation device by the left conveying belt. The left sealing cover is sealed, the air in the cavity formed by the transparent cylinder and the sealing cover is replaced and discharged by cooperating the vacuum pump and the air tank. After completion, the pre-freezing temperature is regulated by the freezing box, and the high water content rock is cut according to the required rock sample size for the first time. The high water content rock is sent to the left side by the right conveying belt, and is cut by cooperating with the cutting assembly. After cutting, the left and right conveying belts are controlled again, and the similar rock samples are separated by a certain distance under the condition of a certain distance interval. In this embodiment, the air pump is started for air internal circulation during cutting, and the vacuum pump, the driving gear and the CT scanning assembly are started. The internal structure of the rock sample is monitored during freeze-drying of the rock sample, and the state of the internal structure of the rock sample of different sizes under different pressures is monitored by the vacuum pressure monitoring head. In this process, the rock sample is cut again by the above cutting step, so that the rock sample is cut again according to the required condition on the basis of monitoring the internal structure of the rock sample, thereby obtaining rock samples obtained under various environmental conditions, and obtaining one or more groups of rock samples with the highest internal structure integrity in the prepared rock sample. The water content of the high water content rock is monitored again by the effect of the crystal particle adhesive net, so that the water content of the high water content rock can be monitored again.

[0038] The above is only a preferred specific embodiment of the application, but the protection scope of the application is not limited thereto. Any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the application within the technical range disclosed by the application, which should be covered within the protection scope of the application.

Claims

1. A non-destructive freeze-drying sample preparation device for high water content rock, characterized in that, Including cutting device (1), sample preparation device (7), the cutting device (1) is coaxial with transparent cylinder (2) on both sides respectively, the transparent cylinder (2) is also provided with sample preparation device (7), the outer port of transparent cylinder (2) is sealingly connected with sealing cover (3), vacuum pump (4) is installed on the left sealing cover (3), air tank (5) is installed on the right sealing cover (3). The cutting device (1) includes half-arc plate (9), ring disc (10) and cutting assembly (11), the ring disc (10) is coaxially arranged at intervals on the left and right, the outer ring of the upper plate of two sets of ring disc (10) is connected by a set of half-arc plate (9), the lower half outer ring of two sets of ring disc (10) is sealingly connected with a set of half-arc plate (9), the cutting assembly (11) is swingably installed on the upper side of ring disc (10), and the dust absorption net (12) is also arranged on the lower half-arc plate (9). The sample preparation device (7) includes rotating ring (13), the rotating ring (13) is provided with two groups, the inner ring wall of the rotating ring (13) is uniformly distributed with multiple parallel plate racks (14), the inner ring wall of the rotating ring (13) is also uniformly distributed with multiple support plates (16), the thick conveyor belt (15) is installed between the left and right parallel plate racks (14), two groups of parallel connecting cross bars (17) are installed between the left and right support plates (16), the outer connecting cross bar (17) is rotatably sleeved with telescopic device (18), the inner connecting cross bar (16) is rotatably sleeved with clamping plate cover (19), and the output end of the telescopic device (18) is hinged to the clamping plate cover (19). The rotating ring (13) close to the ring disc (10) is rotatably connected with the ring disc (10), and the outer ring wall of the rotating ring (13) on the other side is also fixed with a straight tooth ring (21), the straight tooth ring (21) is engaged with a driving gear (22), and the driving gear (22) is installed on the transparent cylinder (2) through a connecting plate seat.

2. The high water content rock non-destructive freeze-drying sample preparation device of claim 1, wherein, The dust absorption net (12) is arranged in three groups in an arc shape, and the aperture of the dust absorption net (12) increases gradually from outside to inside.

3. The high water content rock non-destructive freeze-drying sample preparation device of claim 1, wherein, The outer end of the dust absorption net (12) is also connected with the air pump (6) through a pipeline, and the exhaust end of the air pump (6) is connected with the right sealing cover (3) through a pipeline.

4. The high water content rock non-destructive freeze-drying sample preparation device of claim 1, wherein, The clamping plate cover (19) is also provided with dense air holes (20).

5. The high water content rock non-destructive freeze-drying sample preparation device of claim 1, wherein, It also includes a vacuum pressure monitoring head (25) arranged on the inner wall of the right sealing cover (3).

6. The high water content rock non-destructive freeze-drying sample preparation device of claim 1, wherein, It also includes a CT scanning assembly (8) arranged on the transparent cylinder (2).

7. The high water content rock non-destructive freeze-drying sample preparation device of claim 1, wherein, It also includes a temperature detection head (24) arranged on the transparent cylinder (2).

8. The high water content rock non-destructive freeze-drying sample preparation device of claim 1, wherein, The left sealing cover (3) is also filled with a hemispherical crystal particle adhesive net (23).

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