Permeability testing device for analyzing unconventional gas reservoir sample of coal measure

Abstract

The utility model discloses a permeability testing device for coal unconventional gas reservoir sample analysis. The permeability testing device comprises a testing box, a testing cavity formed in the testing box, and a receiving box fixed at the bottom of the testing box, the side surface of the test box is provided with a test system which is used for providing a vacuum environment and test gas for the interior of the test cavity and monitoring the gas production rate and the pressure difference after the gas passes through the coal series sample; through cooperation of the translation assembly, the translation plate, the first electric cylinder, the sample plate, the butt joint cylinder and the two opening and closing mechanisms, when coal series samples are taken, placed and replaced, the samples can be taken and placed on the premise that the overall vacuum degree is not damaged, the influence on the vacuum environment of testing is small, complete vacuumizing operation is not needed during continuous testing, and the testing efficiency is improved. The problems of high energy consumption and low test efficiency in a traditional device are solved, and the test process is more continuous and stable, so that the convenience of sample replacement, the stability of a test environment and the high efficiency of test efficiency are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal rock test technical field especially relates to a permeability testing device for coal measure unconventional gas reservoir sample analysis. BACKGROUND

[0002] There is a large amount of gas (coal bed gas) in coal seam, which is an important energy, and the development of coal bed gas can provide strong power supply for society, and coal permeability is a parameter for measuring the permeability of coal, in the field of coal bed gas exploration and development, the size of coal bed gas reservoir permeability is an important parameter for affecting the development value of coal bed gas, and the anisotropy determination of coal permeability is the basis for coal bed gas development.

[0003] When the coal sample permeability test is carried out, in order to ensure the purity of the test environment and the accuracy of the test data, the whole test device needs to be completely vacuumized, and the traditional test device often needs to be manually opened and closed for the taking and placing of coal sample, and when multiple samples are continuously tested, the original vacuum state of the test environment will be destroyed every time the cabinet door is opened, which leads to the entry of external air and impurities into the test area, therefore, the test area needs to be completely vacuumized again, which not only increases the energy consumption in the test, but also prolongs the test time and reduces the test efficiency. SUMMARY

[0004] The utility model overcomes the prior art's insufficient and provides a kind of permeability testing device for coal measure unconventional gas reservoir sample analysis.

[0005] To achieve the above purpose, the utility model adopts the technical scheme that a kind of permeability testing device for coal measure unconventional gas reservoir sample analysis, comprising: test box, test cavity being arranged in the test box, and the receiving box being fixed in the bottom of the test box;

[0006] The side of the test box is provided with a test system for providing a vacuum environment and test gas inside the test cavity, and monitoring the gas production and pressure difference after passing through coal sample;The inside of the test cavity is provided with a clamping assembly for clamping coal sample, and the bottom of the test box is fixed with a docking barrel, and the inside of the docking barrel is symmetrically provided with two groups of opening and closing mechanisms for opening or closing the inside of the docking barrel;

[0007] The front of the test box is provided with a controller for setting and receiving test data, and receiving and sending control instructions;The inside of the receiving box is provided with a translation plate, the top of the translation plate is provided with a first electric cylinder, the top of the first electric cylinder is fixed with a sample plate, and the inside bottom of the receiving box is provided with a translation assembly for driving the translation plate to move.

[0008] The utility model discloses a preferable embodiment of the utility model, the receiving box is rectangular with the opening of top and front, the inside of the butt joint cylinder is through with the inside of the test chamber, the first electric jar is electrically connected with the controller.

[0009] The utility model discloses a preferable embodiment of the utility model, the test system includes: the vacuum pipe and the gas pipe of fixed in the test box side, and the exhaust pipe of fixed in the test box top, one end of the vacuum pipe is connected with vacuum pump through the pipeline,

[0010] One end of the gas pipe is connected with flowmeter, gas pressure regulating valve and pressure tank in proper order through the pipeline, one end of the exhaust pipe is connected with gas monitoring bottle through the pipeline, and pressure sensor is installed between flowmeter and gas pressure regulating valve and between exhaust pipe and gas monitoring bottle.

[0011] The utility model discloses a preferable embodiment of the utility model, the gas pipe, the vacuum pipe and the exhaust pipe all are through to the inside of the test chamber, and vacuum pump, flowmeter, gas pressure regulating valve, pressure tank and pressure sensor all are electrically connected with the controller.

[0012] The utility model discloses a preferable embodiment of the utility model, the clamping component includes: the placing groove of setting in the both sides of the test chamber, the second electric jar and the clamping plate of installing in the inboard of the placing groove, the output of the second electric jar is fixed with one side of the clamping plate, and the side of the clamping plate is slidably connected with the inboard of the placing groove, and the second electric jar is electrically connected with the controller.

[0013] The utility model discloses a preferable embodiment of the utility model, the opening and closing mechanism includes: the movable slot of setting in the inboard of the butt joint cylinder, the rotary ring of rotationally connected in the inboard of the movable slot and the hinge of hinged in the middle part of the movable slot, the inboard of the rotary ring is fixed with a plurality of connecting blocks, a plurality of connecting blocks and a plurality of hinges are hinged with a plurality of connecting rods, and the side of the rotary ring is provided with electric push rod and the limiting piece for the rotary ring rotation limiting.

[0014] The utility model discloses a preferable embodiment of the utility model, a plurality of hinges are enclosed to be circular, and the side is in contact with the inboard of the butt joint cylinder, one side of the hinge is hinged with the inboard of the movable slot, the movable slot and the rotary ring are coaxially arranged with the butt joint cylinder, one end of the electric push rod is hinged with the inboard of the movable slot, and the other end is hinged with the side of the rotary ring, and the electric push rod is electrically connected with the controller.

[0015] The limiting piece comprises: a plurality of arc-shaped sliding grooves arranged on the surface of the rotating ring, and a plurality of convex clamping blocks clamped on the inner sides of the arc-shaped sliding grooves.

[0016] In a preferred embodiment of the utility model, the translation assembly comprises: a servo motor fixed on the back of the receiving box, a plurality of sliding rails fixed on the inner bottom of the receiving box, and a lead screw arranged between the sliding rails; the output end of the servo motor is fixed with one end of the lead screw, the bottom of the translation plate is fixed with a moving block and a plurality of sliding blocks, the moving block is threadedly connected with the side surface of the lead screw, and the bottom of the sliding block is slidably connected with the top of the sliding rail.

[0017] In a preferred embodiment of the utility model, the side surface close to the two ends of the lead screw is rotationally connected with the inner side of the receiving box, the number of the sliding blocks is same as that of the sliding rails, and the servo motor is electrically connected with the controller.

[0018] The utility model solves the defects in the background art, and has the following beneficial effects:

[0019] (1) the utility model provides a permeability testing device for coal system unconventional gas reservoir sample analysis, when the coal system sample in the test cavity is tested, through the cooperation of the translation assembly, the translation plate, the first electric cylinder, the sample plate, the butt joint cylinder and the two sets of opening and closing mechanisms, when the coal system sample is taken and replaced, the sample can be taken and placed without damaging the overall vacuum degree, the vacuum environment of the test is small, when continuously testing, complete vacuumizing operation is not needed, not only the problems of high energy consumption and low test efficiency in the traditional device are solved, but also the test process is more continuous and stable, so that the convenience of sample replacement, the stability of the test environment and the efficiency of the test efficiency are realized.

[0020] (2) in the utility model, two sets of opening and closing mechanisms are symmetrically arranged on the inner side of the butt joint cylinder, when the inner side of the butt joint cylinder needs to be opened or closed, through the cooperation of the electric push rod, the rotating ring, the connecting block, the connecting rod, the hinge and the limiting piece, the opening and closing degree of the plurality of hinges can be controlled, the stable contact with the first electric cylinder push shaft can be controlled, the controllability of the closed space is ensured, and the vacuum degree of the test cavity is maintained as much as possible. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further described in connection with the drawings and examples;

[0022] Figure 1 It is the perspective structural diagram of the preferred embodiment of the utility model;

[0023] Figure 2It is the test box and test system connection structure diagram of preferred embodiment of the utility model;

[0024] Figure 3 It is the half cut front view structure diagram of the receiving box of preferred embodiment of the utility model;

[0025] Figure 4 It is the half cut plan structure diagram of the receiving box of preferred embodiment of the utility model;

[0026] In the drawing: 1, test box;11, test cavity;2, receiving box;21, butt joint cylinder;3, controller;4, translation plate;41, first electric cylinder;42, sample plate;5, vacuum pipe;51, gas conveying pipe;52, exhaust pipe;53, vacuum pump;54, flowmeter;55, gas pressure regulating valve;56, pressure tank;57, gas monitoring bottle;58, pressure sensor;6, placing groove;61, second electric cylinder;62, clamping plate;7, movable groove;71, rotating ring;72, hinge;73, connecting block;74, connecting rod;75, electric push rod;8, arc-shaped sliding groove;81, convex clamping block;9, servo motor;91, sliding rail;92, screw;93, moving block;94, sliding block. DETAILED DESCRIPTION

[0027] The utility model will be explained further in detail in combination with the drawings and embodiments, these drawings are all simplified schematic diagram, just with the schematic way shows the basic structure of the utility model, therefore it just shows the constitution related with the utility model.

[0028] As Figure 1 , Figure 2 and Figure 3 Indicated, a kind of for coal series unconventional gas reservoir sample analysis permeability test device, including: test box 1, test cavity 11 being opened in test box 1 inside and receiving box 2 being fixed in the bottom of test box 1;Test box 1 side is provided with test system for providing vacuum environment and test gas inside test cavity 11, and monitoring the gas production and pressure difference after passing through coal series sample;Test cavity 11 inside is provided with clamping assembly for clamping coal series sample, the bottom of test box 1 is fixed with butt joint cylinder 21, the inside of butt joint cylinder 21 is symmetrically provided with two groups of opening and closing mechanisms for opening or closing the inside of butt joint cylinder 21;The front of test box 1 is provided with controller 3 for setting and receiving test data, and receiving and sending control instruction;The inside of receiving box 2 is provided with translation plate 4, the top of translation plate 4 is installed with first electric cylinder 41, the top of first electric cylinder 41 is fixed with sample plate 42, the inside bottom of receiving box 2 is provided with translation assembly for driving translation plate 4 to move.

[0029] It should be noted that the receiving box 2 is rectangular with openings on the top and front, and the inside of the docking cylinder 21 is connected with the inside of the test cavity 11; the first electric cylinder 41 is electrically connected with the controller 3; after the coal sample is clamped in the test cavity 11 by the cooperation of the clamping assembly, the inside of the test cavity 11 can be provided with a vacuum environment and test gas by the cooperation of the test system, and the gas production and pressure difference after passing through the coal sample can be monitored to realize the permeability test of the coal sample; after the test is completed, the first electric cylinder 41 and the sample plate 42 on the top of the translation plate 4 are driven to face the bottom of the docking cylinder 21 by the cooperation of the translation assembly, and the first electric cylinder 41 is controlled to push the sample plate 42 to rise to the first set of opening and closing mechanisms inside the docking cylinder 21; the inside of the docking cylinder 21 is opened by the cooperation of the first set of opening and closing mechanisms, so that the pushing shaft of the first electric cylinder 41 and the sample plate 42 enter between the two sets of opening and closing mechanisms; the inside of the docking cylinder 21 is closed again by the cooperation of the first set of opening and closing mechanisms, until the closed contact is to the side surface of the pushing shaft of the first electric cylinder 41, so that the space between the two sets of opening and closing mechanisms is in a closed state; the inside of the docking cylinder 21 is opened by the cooperation of the second set of opening and closing mechanisms, so that the space in the test cavity 11 is connected with the inside of the docking cylinder 21; the first electric cylinder 41 continues to drive the sample plate 42 to rise to the inside of the test cavity 11, and the clamping of the coal sample is released, so that it falls on the top of the sample plate 42; and the cooperation of the two sets of opening and closing mechanisms is operated in reverse, so that the coal sample can be taken out, and a relatively closed and controllable space is formed between the test cavity 11 and the external environment; when the coal sample is taken out and replaced, the sample can be taken out and placed without damaging the overall vacuum degree, which has little effect on the vacuum environment of the test, and in continuous testing, complete vacuum pumping operation is not required, which not only solves the problems of high energy consumption and low test efficiency in the traditional device, but also makes the test process more continuous and stable, so as to realize the convenience of sample replacement, the stability of the test environment and the high efficiency of the test efficiency.

[0030] It can be understood that the control circuit of the controller 3 can be realized by simple programming of those skilled in the art, which belongs to the common knowledge in the art, and the present application file is mainly used to protect the mechanical device, so the control mode and circuit connection will not be explained in detail, and will not be specifically described here.

[0031] As shown in Figure 2 In some embodiments, the test system comprises a vacuum pipe 5 and a gas conveying pipe 51 fixed on the side of the test box 1, and an exhaust pipe 52 fixed on the top of the test box 1; one end of the vacuum pipe 5 is connected with a vacuum pump 53 through a pipeline; one end of the gas conveying pipe 51 is connected with a flow meter 54, a gas pressure regulating valve 55 and a pressure tank 56 in sequence through a pipeline; one end of the exhaust pipe 52 is connected with a gas monitoring bottle 57 through a pipeline; pressure sensors 58 are installed between the flow meter 54 and the gas pressure regulating valve 55, and between the exhaust pipe 52 and the gas monitoring bottle 57.

[0032] It should be noted that the gas delivery pipe 51, the vacuum pipe 5 and the exhaust pipe 52 all penetrate into the inside of the test cavity 11; the vacuum pump 53, the flow meter 54, the gas pressure regulating valve 55, the pressure tank 56 and the pressure sensor 58 are all electrically connected with the controller 3; during the test, the vacuum pump 53 is controlled to be turned on, the inside of the test cavity 11 is vacuumized through the vacuum pipe 5, after the vacuumization is completed and the coal measure sample is clamped in the inside of the test cavity 11, the pressure tank 56 is controlled to make the gas escape, the pressure of the escaped gas is adjusted through the gas pressure regulating valve 55, the test is carried out at a constant pressure, the pressure sensor 58 between the flow meter 54 and the gas pressure regulating valve 55 detects the passing pressure, the gas passes through the flow meter 54, enters into the inside of the test cavity 11 through the gas delivery pipe 51, the gas permeated through the coal measure sample is discharged through the exhaust pipe 52 at the top of the test box 1, the pressure sensor 58 between the exhaust pipe 52 and the gas monitoring bottle 57 detects the passing pressure, and the gas monitoring bottle 57 records the gas production and the pressure difference between the two ends and other measurement data, and then the controller 3 calculates the relative permeability of the coal measure sample by using a corresponding formula, so as to ensure the accuracy and reliability of the test process.

[0033] In some embodiments, the clamping assembly comprises: a placing groove 6 opened on both sides of the test cavity 11, a second electric cylinder 61 and a clamping plate 62 installed on the inside of the placing groove 6; the output end of the second electric cylinder 61 is fixed with one side of the clamping plate 62, the side surface of the clamping plate 62 is in sliding connection with the inside of the placing groove 6, and the second electric cylinder 61 is electrically connected with the controller 3.

[0034] It should be noted that the controller 3 controls the extension and retraction of the second electric cylinder 61 through an electric signal, the second electric cylinder 61 drives the clamping plate 62 to slide in the placing groove 6, so as to clamp or release the coal measure sample, so that the coal measure sample can be stably placed in the test cavity 11, and the sample can be conveniently replaced.

[0035] As shown in Figure 3 and Figure 4 In some embodiments, the opening and closing mechanism comprises: a movable groove 7 opened on the inside of the butt joint cylinder 21, a rotating ring 71 rotatably connected on the inside of the movable groove 7, and a plurality of opening and closing hinges 72 hingedly connected in the middle of the movable groove 7; a plurality of connecting blocks 73 are fixed on the inside of the rotating ring 71, a plurality of connecting rods 74 are hingedly connected between the plurality of connecting blocks 73 and the plurality of opening and closing hinges 72, and an electric push rod 75 and a limiting piece for rotationally limiting the rotating ring 71 are arranged on the side surface of the rotating ring 71.

[0036] It should be noted that the plurality of hinges 72 are enclosed in a circular shape, and the side surface is in contact with the inner side of the docking cylinder 21; one side of the hinge 72 is hinged to the inner side of the movable groove 7, and the movable groove 7 and the rotating ring 71 are coaxially arranged with the docking cylinder 21; one end of the electric push rod 75 is hinged to the inner side of the movable groove 7, and the other end is hinged to the side surface of the rotating ring 71; the electric push rod 75 is electrically connected with the controller 3; when it is necessary to open or close the inner side of the docking cylinder 21, the rotating ring 71 is driven to rotate by the electric push rod 75, so that the plurality of connecting blocks 73 in the rotating ring 71 can drive the plurality of hinges 72 to open or close through the connecting rod 74, and by limiting the rotation angle of the rotating ring 71, the opening and closing degree of the plurality of hinges 72 can be controlled, so that the stable contact with the first electric cylinder 41 pushing shaft can be controlled, and the controllability of the closed space can be ensured, thereby maintaining the vacuum degree of the test cavity 11 as much as possible.

[0037] In some embodiments, the limiting piece includes: a plurality of arc-shaped sliding grooves 8 opened on the surface of the rotating ring 71, and a plurality of convex clamping blocks 81 clamped in the inner side of the plurality of arc-shaped sliding grooves 8; one end of the plurality of convex clamping blocks 81 is fixed to the inner side of the movable groove 7; when the rotating ring 71 rotates, the arc-shaped sliding groove 8 will slide along the side surface of the convex clamping block 81, which can ensure that the hinge 72 can be accurately opened and closed to the specified position, avoiding failure or damage caused by excessive rotation or insufficient rotation, thereby being able to stabilize and limit the rotation of the rotating ring 71.

[0038] As shown in Figure 1 and Figure 3 In some embodiments, the translation assembly includes: a servo motor 9 fixed on the back of the receiving box 2, a plurality of sliding rails 91 fixed on the inner bottom of the receiving box 2, and a lead screw 92 arranged between the plurality of sliding rails 91; the output end of the servo motor 9 is fixed to one end of the lead screw 92, the bottom of the translation plate 4 is fixed with a moving block 93 and a plurality of sliding blocks 94, the moving block 93 is threadedly connected with the side surface of the lead screw 92, and the bottom of the sliding block 94 is slidably connected with the top of the sliding rail 91.

[0039] It should be noted that the side surfaces close to the two ends of the lead screw 92 are rotatably connected with the inner side of the receiving box 2, the number of the sliding blocks 94 is the same as that of the sliding rails 91, and the servo motor 9 is electrically connected with the controller 3; by controlling the servo motor 9 to drive the lead screw 92 to rotate, the threaded connection between the moving block 93 and the lead screw 92 can realize the linear movement of the translation plate 4, and the sliding connection between the sliding block 94 and the sliding rail 91 can ensure the stable movement of the translation plate 4, so that the coal sample placed on the top can be conveniently moved to the test position, the upper position or the open sampling position in front of the receiving box 2, thereby improving the test efficiency.

[0040] In use, the coal-based sample is securely clamped inside the test chamber 11 by a clamping assembly. The clamping assembly is controlled by the controller 3 to extend and retract the second electric cylinder 61, driving the clamping plate 62 to slide within the placement groove 6 to clamp or release the sample. Subsequently, the test system starts working. The controller 3 starts the vacuum pump 53 to evacuate the test chamber 11 through the vacuum tube 5. After completion, the pressure tank 56 releases gas, and the pressure is regulated by the gas pressure regulating valve 55. The gas then enters the test chamber 11 at a constant pressure through the flow meter 54 and the gas delivery pipe 51. After the gas permeates the coal-based sample, it is discharged through the exhaust pipe 52. The pressure sensor 58 and the flow meter 54 between the exhaust pipe 52 and the gas monitoring bottle 57 monitor the pressure and gas production data, thereby calculating the relative permeability of the coal-based sample. After the test is completed, the controller 3 drives the first electric cylinder 41 and sample plate 42 at the top of the translation plate 4 to move to the bottom of the docking cylinder 21 via the translation component. The first electric cylinder 41 pushes the sample plate 42 up into the docking cylinder 21. The controller 3 controls the bottom of the docking cylinder 21, and the electric push rod 75 in the first set of opening and closing mechanisms drives the rotating ring 71 to rotate, so that the opening and closing flaps 72 open and close in sequence. By utilizing the opening and closing cooperation of the two sets of opening and closing mechanisms, the sample plate 42 is docked with the test chamber 11 and the sample is transferred. The translation component is driven by the servo motor 9 to rotate the lead screw 92. Combined with the sliding connection between the slider 94 and the slide rail 91, the translation plate 4 moves stably. Finally, by reversing the operation of the opening and closing mechanism and the first electric cylinder 41, the coal sample is removed. The whole process is carried out in a relatively closed and controllable space within the test chamber 11, realizing the convenience of sample replacement, the stability of the test environment, and the high efficiency of the test.

[0041] Based on the above description and the preferred embodiments of this utility model, it will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A permeability testing device for coal-based unconventional gas reservoir sample analysis, characterized in that, Include: Test box (1), test cavity (11) opened in the test box (1), and the receiving box (2) fixed on the bottom of the test box (1); The side of the test box (1) is provided with a test system for providing vacuum environment and test gas inside the test cavity (11), and monitoring the gas production and pressure difference after passing through the coal sample; the inside of the test cavity (11) is provided with a clamping assembly for clamping the coal sample, and the bottom of the test box (1) is fixed with a docking cylinder (21), the inside of the docking cylinder (21) is symmetrically provided with two sets of opening and closing mechanisms for opening or closing the inside of the docking cylinder (21); The front of the test box (1) is provided with a controller (3) for setting and receiving test data, and transmitting control instructions; the inside of the receiving box (2) is provided with a translation plate (4), the top of the translation plate (4) is provided with a first electric cylinder (41), the top of the first electric cylinder (41) is fixed with a sample plate (42), and the inside of the receiving box (2) is provided with a translation assembly for driving the translation plate (4) to move.

2. The permeability testing device for coal-based unconventional gas reservoir sample analysis of claim 1, wherein: The receiving box (2) is rectangular with openings on the top and front, and the inside of the docking cylinder (21) is through with the inside of the test cavity (11); the first electric cylinder (41) is electrically connected with the controller (3).

3. The permeability testing device for coal-based unconventional gas reservoir sample analysis of claim 1, wherein: The test system includes: vacuum pipe (5) and gas pipe (51) fixed on the side of the test box (1), and exhaust pipe (52) fixed on the top of the test box (1); one end of the vacuum pipe (5) is connected with a vacuum pump (53) through a pipeline; One end of the gas pipe (51) is connected with a flow meter (54), a gas pressure regulating valve (55) and a pressure tank (56) in sequence through a pipeline; one end of the exhaust pipe (52) is connected with a gas monitoring bottle (57) through a pipeline; pressure sensors (58) are installed between the flow meter (54) and the gas pressure regulating valve (55), and between the exhaust pipe (52) and the gas monitoring bottle (57).

4. The permeability testing device for coal-based unconventional gas reservoir sample analysis of claim 3, wherein: The gas pipe (51), the vacuum pipe (5) and the exhaust pipe (52) all pass through to the inside of the test cavity (11); the vacuum pump (53), the flow meter (54), the gas pressure regulating valve (55), the pressure tank (56) and the pressure sensor (58) are all electrically connected with the controller (3).

5. The permeability testing device for coal-based unconventional gas reservoir sample analysis of claim 1, wherein: The clamping assembly includes: a placing groove (6) opened on both sides of the test cavity (11), a second electric cylinder (61) and a clamping plate (62) installed inside the placing groove (6); the output end of the second electric cylinder (61) is fixed with one side of the clamping plate (62), the side of the clamping plate (62) is slidably connected with the inside of the placing groove (6), and the second electric cylinder (61) is electrically connected with the controller (3).

6. The permeability testing device for coal-based unconventional gas reservoir sample analysis of claim 1, wherein: The opening and closing mechanism comprises a movable slot (7) formed in the inner side of the docking cylinder (21), a rotating ring (71) rotatably connected to the inner side of the movable slot (7), and a plurality of opening and closing hinges (72) hingedly connected to the middle part of the movable slot (7); the inner side of the rotating ring (71) is fixed with a plurality of connecting blocks (73), a plurality of connecting rods (74) are hingedly connected between the plurality of connecting blocks (73) and the plurality of opening and closing hinges (72), and the side surface of the rotating ring (71) is provided with an electric push rod (75) and a limiting piece for limiting the rotation of the rotating ring (71).

7. The permeability testing device for coal-based unconventional gas reservoir sample analysis of claim 6, wherein: The plurality of opening and closing hinges (72) are circumferentially arranged and abut against the inner side of the docking cylinder (21); one side of the opening and closing hinge (72) is hingedly connected to the inner side of the movable slot (7), the movable slot (7) and the rotating ring (71) are coaxially arranged with the docking cylinder (21), one end of the electric push rod (75) is hingedly connected to the inner side of the movable slot (7), the other end is hingedly connected to the side surface of the rotating ring (71), and the electric push rod (75) is electrically connected with the controller (3).

8. The permeability testing device for coal-based unconventional gas reservoir sample analysis of claim 6, wherein: The limiting piece comprises a plurality of arc-shaped sliding grooves (8) formed in the surface of the rotating ring (71), and a plurality of convex clamping blocks (81) clamped in the inner side of the arc-shaped sliding grooves (8); one end of the plurality of convex clamping blocks (81) is fixed to the inner side of the movable slot (7).

9. The permeability testing device for coal-based unconventional gas reservoir sample analysis of claim 1, wherein: The translation assembly comprises a servo motor (9) fixed to the back of the receiving box (2), a plurality of sliding rails (91) fixed to the inner bottom of the receiving box (2), and a lead screw (92) arranged between the plurality of sliding rails (91); the output end of the servo motor (9) is fixed to one end of the lead screw (92), the bottom of the translation plate (4) is fixed with a moving block (93) and a plurality of sliding blocks (94), the moving block (93) is threadedly connected to the side surface of the lead screw (92), and the bottom of the sliding block (94) is slidably connected to the top of the sliding rail (91).

10. The permeability testing device for coal-based unconventional gas reservoir sample analysis of claim 9, wherein: The side surfaces of the lead screw (92) near the two ends are rotatably connected to the inner side of the receiving box (2), the number of the sliding blocks (94) is the same as that of the sliding rails (91), and the servo motor (9) is electrically connected with the controller (3).

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